CN202229208U - Furnace smoke drying and water recycling warehouse-type fan mill hot air powder supplying and making system - Google Patents
Furnace smoke drying and water recycling warehouse-type fan mill hot air powder supplying and making system Download PDFInfo
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Abstract
The utility model discloses a furnace smoke drying and water recycling warehouse-type fan mill hot air powder supplying and making system, which is sequentially provided with an exhaust gas separator, a coal powder bin, a powder supplier and a coal powder mixer between a rough powder separator and a coal powder distributor, wherein an exhaust gas outlet is formed in the upper part of the exhaust gas separator and communicated with an exhaust gas filter; the coal outlet of the exhaust gas filter is communicated with the coal powder bin; the gas outlet of the exhaust gas separator is communicated with an exhaust gas fan which is communicated with a desulfurizing tower; and an air preheater is communicated with the coal powder mixer. By the system, the brown coal combustion quality can be improved such that the coal combustion efficiency is improved; furthermore, by combining brown coal drying, powder making, quality improving, water saving, storing and the like together, the power generation coal consumption is reduced and a large amount of water in the brown coal can be recycled.
Description
Technical field
The utility model belongs to the coal power generation technical field, relates to the brown coal generation technology, says with having, relates to the drying and the pulverized coal preparation system of brown coal.
Background technology
Brown coal; Have another name called the bavin coal; Be brown or brown-black more; Being the inferior fuel of a kind of high-volatile (about 50%), high moisture content (25%-60%), ash-rich (about 30%), low heat value (about 3200kcal/kg), low ash smelting point, cracked, the easy oxidation and spontaneous combustion of easy-weathering, is the minimum pit coal of degree of coalification.Brown coal are mainly used in the fuel in power plant, also can make industrial chemicals, catalyst carrier, adsorbent, purify waste water and reclaim metal etc.Comprise in the subject matter of exploiting, utilize the brown coal process to exist: (1) calorific value is low, and purposes is limited.Build coal electricity base, utilizing lignite resource is a grand strategy of China's energy development.With Inner Mongol Huolin Gol is example, and about 3200kcal/kg, owing to consider the characteristic of such coal can on the spot use basically by local boiler design for the brown coal caloric value.Because the caloric value to coal during most boiler design has strict requirement, use if brown coal are transported to interiorly through transportation, then can't directly burn, greatly limited the production capacity of brown coal; (2) be difficult for storing transportation, it is limited to sell radius.Because China's lignite resource mainly concentrates on ground such as the Inner Mongol, Yunnan and Heilungkiang, and consumption of coal is mainly at the southeast.A large amount of transportations of coal have caused the anxiety of railway transportation capability, and the high moisture content of brown coal does not suit to transport at a distance in addition, and transportation radius is generally in 300 kms; Heat utilization efficiency was low when (3) brown coal burnt, and dust discharge amount is big, and environmental pollution is serious.
Brown coal drying and upgrading generally adopts hot-blast stove, roller drier at present.The drying machine flue gas is entrained with coal dust, and flue gas needs emptying after cyclone separator, air-introduced machine, water scrubber.Because the particularity of brown coal, and to the national no relevant criterion of the design of brown coal drying, standard, the problem that causes the brown coal drying process to exist is more.The brown coal drying and upgrading technology is exactly that it is dry on the spot, obtains the coal of golf calorific value.Brown coal (3200kcal/kg), after super-dry removed 20% moisture, caloric value was about more than the 4800kcal/kg, will double above through drying and upgrading brown coal value.Simultaneously, dried brown coal help storing and transportation more.Brown coal drying and upgrading mainly contains fluid bed, rotary kiln, horizontal moving bed three kinds of technical matters.Drying medium mainly contains flue gas, steam etc.
Because brown coal are a kind of coals of very easily separating out fugitive constituent; When adopting oxygen-containing gas dry, if the problems of excessive heat that the selective oxidation heat release is caused causes the fugitive constituent burning easily; Thereby cause the combustion problem of drying system, influence the normal and stable operation of system.If when all adopting steam to carry out drying, because the emission loss of latent heat causes bigger energy waste easily.
The upgrading of brown coal be meant brown coal at high temperature stand to dewater with the thermal decomposition effect after change into upgraded coal with bituminous coal character.The brown coal dehydration also is accompanied by the variation of the The Nomenclature Composition and Structure of Complexes of some coals except that sloughing part moisture, it is mainly caused by dehydration and process.So the upgrading process of brown coal mainly is the dehydration of brown coal.After dehydration, the moisture of brown coal and reactivity reduce, and caloric value improves, and the discharging of burning back greenhouse gases reduces.If 50% moisture in the brown coal is removed, the greenhouse gas emissions that brown coal burning back is produced reduce by 15%.Learn by the reality test; The brown coal of a kind of moisture 42.52%, caloric value 11.93MJ/kg; Moisture reduces to 14.43% after the upgrading drying, caloric value increases to 18.08MJ/kg, is equivalent to calorific value and has improved 51.6%, and this influence to brown coal power plant is very huge beyond doubt.
And on the other hand, China's freshwater resources total amount is 28000 billion cubic meters, accounts for 6% of water globe resource; Occupy the 6th in the world; But have only 2400 cubic metres per capita, be merely world average level 1/4, rank 121 in the world, be one of 13 countries that water resource is the poorest per capita in the whole world.To 20 end of the centurys, in more than 600 city, the whole nation, there is the insufficient water problem in existing more than 400 city, and wherein more serious lack of water city reaches 110, and National urban lack of water total amount is 60 billion cubic meters.One side China shortage of water resources, China's water utilization rate is low on the other hand.Per ten thousand yuan of industrial output value water consumption of calendar year 2001 China are 90m
3About, for the 3-7 of developed country doubly; Recycling rate of water used by the industries is about 52%, far below the level of developed country 80%.
In the areas such as Inner Mongol that lignite resource is concentrated is typical " the rich coal lack of water " area of China.Underground water is gathered as power plant's moisturizing by a large amount of near coal-mine power plant, makes groundwater resources exhausted, and the meadow large tracts of land desertifies, and forms vicious circle in the course of time.Therefore; In water-deficient area combustion brown coal unit, can develop a kind of novel water-saving technology that in combustion brown coal process, the big water gaging in the brown coal is separated the back regeneration and become the task of top priority; So both for power plant brings economic benefit, also the improvement to the local ecosystem had very positive effect.
When brown coal were mainly used in the fuel in power plant, more advanced both at home and abroad brown coal drying pulverized coal preparation system primary structure was as depicted in figs. 1 and 2.
Fig. 1 is three media (high temperature furnace cigarette, hot-air and low-temperature furnace smoke) brown coal drying pulverized coal preparation systems.In this system, high-temperature flue gas extracts in boiler 13 upper furnace, about 1100 ℃; Low-temperature flue gas is taken out about 130 ℃ of the flue gas (remaining partial fume is discharged through chimney 19) in the flue after the electric cleaner 18 of hanging oneself is handled by air-introduced machine 17; High-temperature flue gas, low-temperature flue gas and 3 kinds of media of hot blast mix the back at mixing chamber 15 and are delivered to coal pulverizer 5 as drier by high temperature boiler flue gas tube road 16.Brown coal in run coal bin 1 get into descending drying tube 4 via feeder 3 again after automatic balance 2 meterings.Brown coal mix with the high temperature drying agent in descending drying tube 4 and get into coal pulverizer 5 after obtaining preliminarily dried.Obtain further drying in the process of brown coal fragmentation in coal pulverizer 5.The mill separator 6 of coal pulverizer 5 outlets is sent thick pulverized coal particle back to coal pulverizer 5 and is continued to grind, and coal dust and weary gas are transported to burner 8 through pulverized coal distributor 7 and get into the burner hearth burning.The generation of hot blast is to be produced by pressure fan 9, and carries out preheating through the air preheater 10 that is arranged in flue, and the hot blast after the preheating divides two-way, and one the tunnel as a hot blast entering mixing chamber, and another road gets into burner 8 as secondary hot-air and carries out combustion-supporting.Reclaim in the warehouse formula fan mill pulverized coal carried by hot air pulverized coal preparation system in this stove cigarette drying and water; Adopt three medium systems that following advantage is arranged: 1) three medium dryings can be through regulating the dry demand of the different operating modes of cold and hot exhaust gas volumn adaptation coal pulverizer; Can keep hot blast rate constant, help fuel and under optimum condition, burn.2) the blending cold flue gas can guarantee CO in the pulverized coal preparation system drier
2Content is greater than 4%, but by this pulverized coal preparation system of factors such as pipeline leaks out the danger of blasting often arranged also.Cold smoke feeds cold smoke in coal pulverizer when stopping grinding can make hot coal pulverizer coasting operation, not only can blow out surplus powder but also can cool off coal pulverizer.3) regulate flexibly, reliable.4) can reduce the burner region temperature levels, reduce or avoid slagging scorification takes place in the burner hearth, and can reduce NO
xGeneration.
Fig. 2 is second medium (high temperature furnace cigarette, a hot-air) brown coal drying pulverized coal preparation system, and this system compares with three medium brown coal drying pulverized coal preparation systems shown in Figure 1 and lacked the pipeline that generates cold smoke.In this system, coal pulverizer 5 aspirates about 1100 ℃ high-temperature flue gas from the upper furnace of boiler 13, with the descending drying tube 4 of entering after the hot-air that generates through pressure fan 9, air preheater 10 mixes, carries out predrying to coal breakage within it.After the mixture of drier (being the mist of high temperature furnace cigarette and hot-air) and coal got into coal pulverizer 5, fuel obtained further drying in the process of grinding.The pressure head that coal pulverizer produces is sent desiccant mixture into mill separator 6, and meal returns coal pulverizer 5 and ground again, and weary gas is then sent into coal dust in the burner 8.
Above-mentioned two kinds of brown coal drying pulverized coal preparation systems are all strengthened drying and are guaranteed fuel smooth combustion aspect; But all can send evaporating a large amount of steam that in the brown coal drying process into burner hearth; This makes fire box temperature reduce on the one hand, has increased the Coal-fired capacity of burner hearth, has increased the heating surface of boiler simultaneously; The boiler using brown coal cost is obviously increased, and the combustion mark coal burning boiler of a 600MW is compared cost with a same combustion boiler using brown coal and is differed 200,000,000 yuans nearly.Heat loss due to exhaust gas is increased, and boiler thermal output reduces.
Present power station brown coal drying pulverized coal preparation system all is conceived to drying and powder process to brown coal, and the water in the brown coal has got into burner hearth with weary gas after becoming steam in the lump.And the brown coal upgrading brings a large amount of problems such as storage after the brown coal upgrading, packing, transportation, spontaneous combustion, environmental pollution equally, and invests huge.And it fails to make overall plans with the brown coal pulverized coal preparation system of power plant, makes that all kinds of brown coal upgrading technical costs are bigger, all can not apply.
The utility model content
Thereby the utility model technical problem to be solved provides a kind of brown coal burnup quality that can either improve strengthens the coal-fired thermal efficiency; Give brown coal drying, powder process, upgrading, water saving, accumulating etc. altogether; Can reduce gross coal consumption rate, can stove cigarette drying and the water that the big water gaging in the brown coal is recycled be reclaimed warehouse formula fan mill pulverized coal carried by hot air pulverized coal preparation system again.This system combustion brown coal power plant dry powder process combine with the brown coal upgrading; Can obviously reduce boiler volume and manufacturing cost and become bituminous coal stove to original brown coal stove, simultaneously to have overcome existing independently brown coal drying powder-making technique system and the deficiency that exists of brown coal drying and upgrading technological system independently.
In order to solve the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of stove cigarette drying and water reclaim warehouse formula fan mill pulverized coal carried by hot air pulverized coal preparation system, comprise boiler, are connected in series run coal bin, descending drying tube, blower mill, the mill separator that is communicated with, pulverized coal distributor successively; Said coal dust classifier is communicated with the burner of boiler again, also comprises mixing chamber, and this mixing chamber first air inlet and second air inlet are communicated with the smoking mouth and the cold smoke blower fan of boiler respectively; What said cold smoke extension set was communicated with boiler is provided with flue tail flue gas dust removal device; The gas outlet of said mixing chamber is communicated with descending drying tube again, the other pressure fan that is provided with of said boiler flue, and this pressure fan air preheater interior with being located at flue is communicated with; It is characterized in that: also be provided with weary gas separating device, Pulverized Coal Bin, machine supplying powder and coal, pulverulent fuel mixer between said mill separator and the pulverized coal distributor successively; Said weary gas separating device top has weary gas outlet, and this weary gas outlet is communicated with weary air filter, and the coal outlet of said weary air filter is communicated with Pulverized Coal Bin again; The gas outlet of weary gas separating device is communicated with a weary gas blower fan, and this weary gas blower fan is communicated with desulfurizing tower again; Said air preheater also is communicated with coal, pulverulent fuel mixer.
Adopt technique scheme; Increasing has weary gas separating device, Pulverized Coal Bin, powder feeding machine, coal, pulverulent fuel mixer; So weary gas and a spot of coal dust will be separated through weary air filter from weary gas separating device and filter; Filter a section coal dust that keeps off and then can flow down the powder feeding machine from coal outlet; The powder feeding machine together gets into burner in that coal dust and dried brown coal are together sent under coal, pulverulent fuel mixer and the effect at hot blast, and the weary gas entering desulfurizing tower under weary gas blower fan draws that does not contain coal dust after filtering is handled.
At native system; Because the weary gas of steam that includes that produces does not together get into burner hearth in company with dried brown coal, and the interior temperature of stove is raise, and helps to improve fuel economy; The heating surface area of boiler can be reduced, boiler volume and manufacturing cost can be obviously lowered.In addition; In the utility model, only adopt high-temperature flue gas and cold smoke (second medium is not got rid of moderate oven cigarette and cold smoke, moderate oven cigarette and hot blast, high temperature furnace cigarette and hot blast in the utility model) brown coal to be carried out drying as drier; And do not mix hot blast in the drier; At this moment the hot blast oxygen content causes deflagration accident having easily than higher.It is very low as its oxygen content of drier with high-temperature flue gas and cold smoke that stove cigarette drying and water reclaim warehouse formula fan mill pulverized coal carried by hot air pulverized coal preparation system, so just avoided the generation of brown coal deflagration accident havings in dry shattering process.In addition; The utility model is sent dried brown coal into burner with hot blast, and one side can suitably improve the outlet temperature behind the coal pulverizer, can significantly improve the flammability of fuel like this; The boiler low load stable combustion performance strengthens, and enough hot-airs are arranged when guaranteeing boiler combustion on the other hand.At native system, through Pulverized Coal Bin is set, can be so that powder process receive the influence of boiler load, thus can improve milling efficiency.
In addition, in the further improvement of the utility model, also be provided with weary gas cooler between said weary gas blower fan and the desulfurizing tower.Weary gas cooler can in addition become water after cold the doubting and recycles on the one hand lacking in the gas steam, can also the flue gas after the dehydration be got into desulfurizing tower of electric power plant handle sending into the Water of Power Plant system after the cooling water heating.Collect big water gaging in the brown coal like this, after waste water unit is handled, can be used as the moisturizing of power plant again, again can with lack in the gas heat in addition recovery.Therefore stove cigarette drying and water reclaim the comprehensive advantage that warehouse formula fan mill pulverized coal carried by hot air pulverized coal preparation system technology has energy-conservation, water saving, environmental protection, and is great especially to the water-deficient area meaning.
In addition, also in the utility model further improves, also be provided with Pulverized Coal Bin between said weary gas separating device and the powder feeding machine.Contain certain coal dust in the Pulverized Coal Bin and regulate the pulverized coal flow of main burner to guarantee machine supplying powder.
Description of drawings
Fig. 1 is three medium brown coal drying pulverized coal preparation system structural representations in the prior art;
Fig. 2 is a second medium brown coal drying pulverized coal preparation system structural representation in the prior art;
Fig. 3 is that the three medium stove cigarette dryings and the water of utility model reclaims warehouse formula fan mill pulverized coal carried by hot air pulverized coal preparation system structural representation.
The specific embodiment
As shown in Figure 3, in the three medium stove cigarette dryings and water recovery warehouse formula fan mill pulverized coal carried by hot air pulverized coal preparation system of the utility model, run coal bin 1 is connected to automatic balance 2; Automatic balance 2 connects feeder 3 again; Feeder 3 connects descending drying tube 4 again, and descending drying tube 4 connects blower mill 5 again, and blower mill 5 connects mill separator 6 again; Mill separator connects weary gas separating device 22, weary gas separating device 22 is communicated with powder feeding machine 24 through Pulverized Coal Bin 23 again; Powder feeding machine 24 connects coal, pulverulent fuel mixer 25 again, and coal, pulverulent fuel mixer 25 connects pulverized coal distributor 7 again, the pulverized coal distributor 7 last burners 8 that connect boiler 13.The upper furnace of boiler 13 has the mouth of smoking 14, and this smoking mouth 14 is communicated to first air inlet of mixing chamber 15.The other pressure fan 9 that is provided with of the middle part flue of boiler 13; This pressure fan 9 is communicated in the air preheater 10 in the flue; This air preheater 10 minutes is through hot air duct 11 two-way, and one the tunnel is communicated to burner 8 through secondary wind bellows 12, and another road then is communicated with coal, pulverulent fuel mixer 25.Flue afterbody at boiler 13 also is provided with smoke duster 17; This smoke duster 17 is connected with air-introduced machine 18,18 fens two-way of this air-introduced machine, and one the tunnel is communicated to chimney 19; Another road is communicated with a cold smoke blower fan 20, and this cold smoke blower fan 20 is communicated to second air inlet of mixing chamber 15 again.The gas outlet of mixing chamber 15 is communicated to descending drying tube 4 through high temperature boiler flue gas tube road 16.Have weary gas outlet on the top of weary gas separating device 22; Should weary gas outlet be communicated with weary air filter 27; The coal outlet of weary air filter 27 is communicated with powder feeding machine 24 through Pulverized Coal Bin 23 or without Pulverized Coal Bin 23 again; The gas outlet of weary air filter 27 connects a weary gas blower fan 37, and this weary gas blower fan 37 is communicated with desulfurizing tower through weary gas cooler 30 or without weary gas cooler 30 again.Coal pulverizer 5 adopts blower mill.
The operation principle that this stove cigarette drying and water reclaim warehouse formula fan mill pulverized coal carried by hot air pulverized coal preparation system is:
Raw coal is claimed to fall into descending drying tube 4 through feeder 3 after 2 meterings through run coal bin 1 to automatic scales, and mixes with the second medium hypoxemia drier of being made up of high temperature furnace cigarette and cold smoke.
About 1100 ℃ of high temperature furnace cigarettes extract at the smoking mouth 14 on boiler furnace top; About 130 ℃ of cold smokes are taken from boiler tail flue gas dust removal device 17 and are delivered to the stokehold with air-introduced machine 18 backs and via cold smoke blower fan 20 and cold smoke pipeline 21; The two is mixed at mixing chamber 15 has certain drier of gentle flow just, and drier is delivered to descending drying tube 4 by film high-temp. stove smoke pipe road 16.
After raw coal mixes in descending drying tube 4 with about 800 ℃ of high temperature drying agent and accomplishes preliminarily dried, get into blower mill 5.Raw coal is fractured into coal dust in blower mill 5, the agent that also is dried simultaneously is further dry, and blower mill 5 outlet coal dust moisture are about 5%, about 180 ℃～220 ℃ of wind powder mixture temperature.The wind powder mixture that blower mill 5 is seen off gets into the mill separator 6 that blower mill 5 outlets are arranged; Mill separator 6 is sent thick pulverized coal particle back to blower mill 5 and is continued to grind, and qualified coal dust and weary gas (the temperature reduction is that the drier after drying capacity reduces is called weary gas) get into weary gas separating device 22 and carries out gas solid separation.Weary gas separating device 22 isolated coal dusts fall into Pulverized Coal Bin 23 and send into the pulverized coal carried by hot air pipeline via machine supplying powder 24 through coal, pulverulent fuel mixer 25 again; Hot blast is sent to burner 8 through coal, pulverulent fuel mixer 25 and pulverized coal distributor 7 with coal dust.
The weary gas separating device 22 isolated weary gas that contain a small amount of fine powder are sent into weary air filter 27 recovery fine powders by containing milling waste steam pipeline 26; The fine powder that weary air filter 27 reclaims is sent back in the pulverized coal flow that lacks gas separating device 22 outlets via pulverized coal feed pipe 33 through packing auger 32 and is got in the Pulverized Coal Bin 23; Send into the pulverized coal carried by hot air pipeline via machine supplying powder 24 through coal, pulverulent fuel mixer 25 again, hot blast is sent to boiler-burner 8 through coal, pulverulent fuel mixer 25 and pulverized coal distributor 7 with coal dust.
The weary gas of weary air filter 27 weary gas outlets sends into the collection waste heat recovery through weary gas blower fan 28 via blast pipe road 29 and moisture is recovered as in the weary gas cooler 30 of one.A large amount of steam contained in the weary gas become liquid condensate after weary gas cooler 30 cools; Condensate can be given reuse through water treatment; The waste heat that cooling water reclaims in the weary gas cooler 30 can return the Water of Power Plant system and utilize, and the low temperature waste gas of weary gas cooler 30 outlets is sent into desulfurizing tower and after the boiler exhaust gas purified treatment, discharged.
If when the weary gas cooler 30 of not arranging weary gas cooler 30 or having arranged needed maintenance, blast pipe road 29 can directly be sent to desulfurizing tower via cooler bypass duct 31 with lacking gas.
In the air flow process; Cold air is sent into air preheater 10 by pressure fan 9 is become hot-air by flue gas heating to uniform temperature; Hot-air is carried by hot air duct 11 and is divided into two-way, and one the tunnel is sent to boiler-burner 8 through coal, pulverulent fuel mixer 25 and pulverized coal distributor 7 with coal dust as a wind, and another road also is sent to burner 8 as secondary wind after secondary wind bellows 12 distribute; The two mixes in stove through burner 8, makes the burning of fuel stability and high efficiency.
In this system; Drier the flow through resistance of mill separator 6 and coal dust classifier 22 of resistance and the wind powder mixture of high temperature boiler flue gas tube road 16 and descending drying tube 4 of flowing through is provided by the lifting pressure head of coal pulverizer 5 self, and weary air-flow is provided by weary gas blower fan through the resistance of weary air filter 27 with weary gas cooler 30 and corresponding pipeline.
Native system has brown coal high temperature flue gas drying, powder process, dehydration, the direct systems technology of burning and combining; Make pulverizing process realize zero-emission; Have water saving, energy-conservation, economy and environmental protection function, realized that the powder-making technique in the brown coal drying shattering process combines with the upgrading technology.This efficient brown coal upgrading pulverized coal preparation system patent has following characteristics:
(1) is adapted to 30% brown coal low-calorie inferior with moisture;
(2) stove cigarette drying and water recovery warehouse formula fan mill pulverized coal carried by hot air pulverized coal preparation system adopts high-temperature flue gas and cold smoke as drier, brown coal is carried out drying, and mix hot blast as drier, and therefore the oxygen content in the drying, often causes deflagration accident having than higher.Native system employing high-temperature flue gas and cold smoke are extremely low as the drier oxygen content, have avoided the generation of the deflagration accident having in dry shattering process.
(3) the pulverized coal carried by hot air technology behind the weary gas separating device of native system employing; Therefore, the outlet temperature behind the blower mill can be suitably improved, the flammability of fuel can be significantly improved like this; The boiler low load stable combustion performance strengthens; Can save the combustion-supporting oil of a large amount of underloads or not throw the oil operation, also make boiler oil adaptability strengthen the young brown coal that the burning calorific value is lower simultaneously.
(4) native system has been avoided a large amount of problems such as other brown coal upgrading technology storage, packing, transportation, spontaneous combustion, environmental pollution, combines with the pulverized coal preparation system of power plant.
(5) moisture of 95% in the native system brown coal can not get into burner hearth; Fire box temperature is improved; Thereby this helps the fuel after-flame on the one hand and improves fuel economy, according to measuring and calculating, and the brown coal of a kind of moisture 42.52%, caloric value 11.93MJ/kg; Moisture reduces to 14.43% after the upgrading drying, caloric value increases to 18.08MJ/kg, is equivalent to calorific value and has improved 51.6%.With Inner Mongol coal price in 2009 is example, and the near coal-mine valency of brown coal (3200kcal/kg) is about 70 yuan/ton, and after super-dry removed 20% moisture, caloric value was about more than the 4800kcal/kg, and boiler efficiency can reach more than 95%.Also make the corresponding minimizing of required heating surface in the stove on the other hand,, nearly can reduce about 200,000,000 yuan like the boiler investment of a 600MW, thereby obviously reduce power plant's initial cost so it is boiler dedicated in the design of combustion brown coal power plant, can to adopt the standard bituminous coal fired boiler to substitute former brown coal;
(6) native system, environmentally harmful flammable fugitive constituent gas is sent into the burner hearth burning in the weary gas, has both improved fuel availability thus, has also avoided weary gas directly to enter the severe contamination of atmosphere to environment; Less not burning is worth to flammable fugitive constituent gas in the weary gas, handles through directly advancing desulfurizing tower after the heat exchange, with the protection environment.
(7) 95% moisture in the native system brown coal gets into weary gas cooler with the steam state with weary gas, condenses through weary gas cooler cooling and reclaims, like the brown unit of investment 2*600MW; Every is per hour used 400 tons of meters of coal; The total moisture of brown coal is 40%, and recyclable water more than 2,800,000 tons can be saved a large amount of power-plant makeups thus; Have significant water-saving benefit, especially be fit to the national conditions mostly China brown coal place of production is the water-deficient area;
(8) the weary gas cooler of native system is not only economized on water, and also makes the latent heat of condensation of large quantity of moisture in the weary gas be able to reclaim and return the Water of Power Plant circulatory system simultaneously, thereby the gross coal consumption rate of brown coal power plant is minimized, and has remarkable economic efficiency.
(9) native system adopts the coal pulverizer structure of fan type, and it is a disintegrating machine, is again air blast, or drying machine.
(10) native system adopts the high-moisture brown coal, before coal pulverizer, carries out predryingly, has improved brown coal mill drying and has exerted oneself.
(11) native system is after raw coal is weighed automatically, and in the defeated coal process of feeder, giving one is that temperature is carried out predrying.
But; Those of ordinary skill in the art will be appreciated that; Above embodiment is used for explaining the utility model; And be not the qualification that is used as the utility model, as long as in the connotation scope of the utility model, all will drop in claims scope of the utility model variation, the modification of the above embodiment.
Claims (2)
1. stove cigarette drying and water reclaim warehouse formula fan mill pulverized coal carried by hot air pulverized coal preparation system, comprise boiler, the run coal bin, descending drying tube, blower mill, the mill separator that are communicated with of serial connection successively, pulverized coal distributor; Said coal dust classifier is communicated with the burner of boiler again, also comprises mixing chamber, and this mixing chamber first air inlet and second air inlet are communicated with the smoking mouth and the cold smoke blower fan of boiler respectively; What said cold smoke extension set was communicated with boiler is located at flue tail flue gas dust removal device; The gas outlet of said mixing chamber is communicated with descending drying tube again, the other pressure fan that is provided with of said boiler flue, and this pressure fan air preheater interior with being located at flue is communicated with; It is characterized in that: also be provided with weary gas separating device, Pulverized Coal Bin, machine supplying powder and coal, pulverulent fuel mixer between said mill separator and the pulverized coal distributor successively; Said weary gas separating device top has weary gas outlet, and this weary gas outlet is communicated with weary air filter, and the coal outlet of said weary air filter is communicated with Pulverized Coal Bin again; The gas outlet of weary gas separating device is communicated with a weary gas blower fan, and this weary gas blower fan is communicated with desulfurizing tower again; Said air preheater also is communicated with coal, pulverulent fuel mixer.
2. stove cigarette drying according to claim 1 and water reclaim warehouse formula fan mill pulverized coal carried by hot air pulverized coal preparation system, it is characterized in that: also be provided with weary gas cooler between said weary gas blower fan and the desulfurizing tower.
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2011
- 2011-05-27 CN CN 201120175034 patent/CN202229208U/en not_active Expired - Lifetime
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| CN105333724A (en) * | 2015-11-06 | 2016-02-17 | 西安热工研究院有限公司 | Safety storage and transportation method of dried brown coal |
| CN108080158A (en) * | 2017-12-17 | 2018-05-29 | 江苏日升电力机械有限公司 | A kind of coal, pulverulent fuel mixer eddy flow mechanism |
| CN114111315A (en) * | 2020-08-31 | 2022-03-01 | 昆明理工大学 | Pulverized coal drying energy-saving method for pulverized coal gasification coal grinding workshop section |
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| CN113091087A (en) * | 2021-04-22 | 2021-07-09 | 华能伊敏煤电有限责任公司汇流河热电分公司 | Thermal power unloading intelligence control system |
| CN113091087B (en) * | 2021-04-22 | 2022-10-18 | 华能伊敏煤电有限责任公司汇流河热电分公司 | Thermal power unloading intelligence control system |
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