CN101139158B - Sewage sludge harmlessness disposing technique - Google Patents
Sewage sludge harmlessness disposing technique Download PDFInfo
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- CN101139158B CN101139158B CN2007100704777A CN200710070477A CN101139158B CN 101139158 B CN101139158 B CN 101139158B CN 2007100704777 A CN2007100704777 A CN 2007100704777A CN 200710070477 A CN200710070477 A CN 200710070477A CN 101139158 B CN101139158 B CN 101139158B
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Abstract
The present invention discloses a harmless treatment process for sewage sludge. The dewater treatment is applied to the sewage sludge and then the treated sewage sludge is delivered into a dryer so as to be dried; when the water content of the dried sewage sludge is controlled to range from 40 percent to 50 percent, 40 percent to 60 percent of anhydrated sewage sludge is taken to be mixed with the bituminous coal and then treated sewage sludge is delivered into a hot blast stove to go into incineration. The mix proportion between the bituminous coal against the sewage sludge ranges from 0.25 to 1 and the heat generated from the incineration is supplied to the dryer in the form of hot air. The tail gas delivered out from the dryer enters a cyclone separator to go into the solid separation and the fine particles after the separation are recycled, and the discharged gas enters a water bath tower and is exhausted after going through the cooling and deodorization treatment. The sewage sludge is mixed with the coal and then the incineration is implemented and the heat generated from the incineration is recycled so as to be supplied to the dryer for the present invention, thus avoiding the moisture content of the sewage sludge from being lowered to be less than 10 percent, simplifying the combination of the equipments, saving the initial investment and lowering the operating cost and enhancing the throughput.
Description
Technical field
The invention discloses the harmlessness disposing technique that a kind of sewage sludge harmlessness disposing technique, particularly finger mark dye sludge produced by sewage treatment.
Background technology
Printing and dyeing sludge is the deposit that sewage treatment plant produces in sewage disposal process, contain large quantity of moisture and organic matter, bacterium, also contain multiple metallic element, be mainly iron, silicon, calcium, sulphur, aluminium, phosphorus, magnesium etc., the method of disposal of mud mainly contains compost treatment at present, sanitary landfills, agricultural greening, ocean dumping, technology such as burning disposal, the mud of dyeing waste water and generation thereof contains a large amount of organic substances, content can be up to about 10～15%, but nitrogen wherein, phosphorus, the content of potassium only has 1%, 0.2%, 0, and heavy metal ion content surpasses agricultural sludge heavy-metal content in the mud, therefore, be not suitable for agricultural greening, and take the mode of landfill, then there are place and secondary pollution problem.And the burning of mud utilizes technology because can be rapidly and make mud reach minimizing largely, not only solved the problem of outlet of mud but also utilized fully the energy in the mud, be able to extensive utilization in many countries in recent years, but it is huge to burn investment, the operational administrative complexity, energy consumption and operating cost are all very high, in conjunction with the general situation on the low side of wastewater treatment in China charge, be difficult to promote, many medium and small sewage treatment plants produce 1 ton of dewatered sludge, need 2 tons of coals, therefore, how energy-saving and cost-reducing on the harmlessness disposing of mud, be a urgent problem.
Summary of the invention
The objective of the invention is to a kind of sewage sludge harmlessness disposing technique of efficient, low energy consumption, be intended to improve the printing and dyeing sludge treatment effeciency, reduce disposal cost.
According to experimental analysis, the caloric value of printing and dyeing sludge is 3000kcal/kg (40% wet basis), ash content after the burning is 22%～25%, about 248～253 ℃ of the ignition point of pure mud, be easy to be lighted than bituminous coal, heat is concentrated and is released for twice during sludge incineration, the mechanical strength of mud, heat endurance shows and is suitable for adopting gasification furnace burning, determine to take circulation technology in sludge drying+burning in view of the above, concrete technical scheme is as follows: carry out drying with sending into drying machine after the sludge dewatering treatment, the mud of drying control water content to 40%～50% o'clock, get to enter in the hot-blast stove after mud and bituminous coal are mixed after 40～60% mummification and burn, bituminous coal and mud mixed ratio are 0.25～1, burn the heat that is produced and supply with drying machine with the form of hot-air.
Described drying machine is that rotary wind type forces fluidization to scrape the wall type drying machine, and dryer inner is divided into three working chambers: the first working chamber cavity temperature is at 200 ℃, and the mud temperature is 45 ℃～50 ℃; The second working chamber cavity temperature is at 180 ℃, and the mud temperature is 45 ℃～50 ℃; The 3rd working chamber cavity temperature is 130 ℃, and the mud temperature is no more than 50～55 ℃, water content 40～50%.
Drying mode adopts the high-temperature hot-air convective drying, be that mud is by the charging of drying machine one bottom portion, upwards throwing under the rotor effect, hot blast enters drying machine by sewage sludge feed tube top, with directly contacted by the material of throwing, material travels forward under the effect of rotor and hot blast, realizes the matter heat exchange, and the dried sludge moisture content of drying machine is controlled at 40%～50%
Described hot-blast stove adopts the mud coal gasification furnace, gasification furnace is made up of body of heater, combustion chamber, heat accumulation chamber three parts, through the mud after the mummification, coal blending by a certain percentage enters the combustion chamber of hot-blast stove and burns, and the heat energy that the combustion chamber is produced by the heat accumulation chamber is to the drying machine heat supply, to satisfy the requirement of dryer system to heat.
The chemical equation of coal slime mixed burning is as follows in the combustion chamber:
Coal slime fuel combination among the present invention preferably adopts bituminous coal, and the coal slime mixed proportion is by 0.25～1 mixed the burning, and preferred proportion is 0.4: 1.1.
The drying machine tail gas discharged enters cyclone separator and carries out the solid separation, and the fine grained after the separation reclaims, and the gas of discharge enters the water-bath tower, discharging after cooling, deodorizing are handled.
Beneficial effect of the present invention is as follows: mud in drying process without blending, the highly dispersed state directly contacts with high-temperature hot-air in drying machine, with first moisture sludge drying 83% moisture eventually to 40%～50% after, a part with burn after bituminous coal mixes, burn the heat recovery that produces and supply with drying machine, so both avoided the mistake that sludge water content is reduced to below 10% is hanged down state, simplified the combination of equipment, save one-time investment, reduce total installed capacity power, greatly reduce running expense again, improved treating capacity, also greatly reduce material moisture simultaneously and cross low catching fire of easily heating up and bring, hidden dangers such as blast.
Description of drawings
Fig. 1 is a circulation technology route map in the sludge anhydration burning of the present invention;
Fig. 2 is the energy balance figure of circulation technology in the sludge anhydration burning of the present invention;
Fig. 3 is the economic analysis precondition table of circulation technology in the sludge anhydration burning of the present invention;
Fig. 4 is the economic analysis list (is example with over dry sludge quantity 1380kg/h) of circulation technology in the sludge anhydration burning of the present invention.
The specific embodiment
Process route of the present invention as shown in Figure 1 is as follows: be that 80～90% mud is after the belt filter press processed with water content, in the mud screw pump is delivered to few mud surge bunker, deliver to the drying machine charging aperture through conveying worm again, after drying machine carries out drying, control sludge moisture content to 40%～50% o'clock, 50% dewatered sludge is delivered to the coal piling place of air-heater by conveying worm, after being mixed in 0.25～1 ratio with bituminous coal, by burning in the combustion chamber that enters hot-blast stove, all the other dewatered sludges send outer the stacking by effluxing conveying worm, the hot air reflow that produces in the hot-blast stove is to the drying machine heat supply, drying machine tail gas is delivered to the water-bath tower by air-introduced machine and is cooled off through cyclone dust removal, the back discharging is handled in deodorizing.
1, sludge drying
It is that rotary wind type forces fluidization to scrape the wall type drying machine that drying machine adopts type, and dryer inner is divided into three working chambers, and the water content after dehydration is that about 70% wet mud is finished mummification through three working chambers successively:
First working chamber, cavity temperature are at 200 ℃, and mud directly contacts and be warming up to rapidly wet-bulb temperature with high-temperature hot-air, and general mud temperature belongs to the intensification dryer section at 45 ℃～50 ℃;
Second working chamber, cavity temperature are at 180 ℃, and a large amount of moisture are evaporated, and belong to constant speed drying section this moment, is main dryer section;
The 3rd working chamber, cavity temperature be at 130 ℃, and this moment, the water evaporates speed of mud reduced, and the mud temperature begins to rise gradually, belongs to deceleration drying section, and the mud temperature is no more than 55 ℃, moisturely reduces to 40%, finishes drying sludge.
Drying mode adopts the high-temperature hot-air convective drying, and promptly mud is by the charging of drying machine one bottom portion, and throwing makes progress under the rotor effect, hot blast enters drying machine by sewage sludge feed tube top, with directly contacted by the material of throwing, material travels forward under the effect of rotor and hot blast, realizes the matter heat exchange.
Three sections dried sludge moisture contents of drying machine are controlled at 40%～50%, this is because in drying process, moisture mud viscosity in the time of 70%～50% is bigger, the stagnant zone that shows mud is moisture content 70%～50% this zone, when being lower than, moisture promptly forms stable dispersion agglomerate after 50%, can stack and transport it, it be agglomerating can not bond; In addition, in drying process, find, after being lower than 40%, moisture percentage in sewage sludge is Powdered, easily form dust, therefore the mummification degree should be controlled in the scope of moisture content 40～50%, both can form more stable dispersion agglomerate, stacks transportation and can not bond agglomerating, and continuing drying not only needs more energy, and heat transfer rate also will reduce; On the other hand, during the work of coal sludge gasification combustion furnace, fuel needs a certain amount of water can generate water-gas in the reduction reaction of gasification, and therefore, the moisture that contains in the mud can satisfy the demand of gasification water.In addition, consider the super-dry phenomenon that as far as possible reduces local mud, avoid catching fire, the generation of explosion accident that the final moisture content of mud should not be low excessively; Comprehensive above-mentioned some, the moisture content of mud is controlled to be 40%～50% after the mummification, is preferably 40%～45%.Like this, combustion furnace is required a certain amount of water in the gasification, and combustion process, can be satisfied by moisture content contained in the mud after the mummification, had both guaranteed the safety of mud in dry run, has reduced energy consumption, has saved again to fuel and added the such procedure of running water.
2, the coal slime burning that is mixed
Hot-blast stove adopts the mud coal gasification furnace, and gasification furnace is made up of body of heater, combustion chamber, heat accumulation chamber three parts.
Water content is 40～50% mud after the process mummification, get 50% with after bituminous coal mixes in 0.25～1 ratio, enter the Combustion of Hot Air Furnace chamber and burn, and the hot air reflow that the combustion chamber is produced by the heat accumulation chamber is to the drying machine heat supply, to satisfy the requirement of dryer system to heat.
The chemical equation of coal slime mixed burning is as follows in the combustion chamber:
The coal slime mixed proportion is preferably 0.4: 1.1, the dewatered sludge that is per 0.4 ton of bituminous coal and 1.1 tons is mixed, according to above-mentioned chemical equation, need water 300kg, and 1.1 tons of moisture content to contain moisture in 40% dried back mud be 440kg, wherein 300kg moisture consumes as reaction raw materials, unnecessary 140kg water enters in the drying machine with hot blast as superheated steam wet mud is carried out drying, this is because the water-in-fuel amount has very big uncertainty in the actual production, in order to guarantee the abundant of gasification reaction, usually adopt suitably excessive mode of water-in-fuel amount, excessive water is heated to form superheated steam (＞100 ℃) in hot-blast stove, superheated steam equally can be as drying medium along with hot blast finishes heat exchange in drying machine after, discharge together with tail gas, in this process, because the drying machine tail gas temperature generally still is higher than 100 ℃, so excessive water is in the superheated steam state all the time in drying machine, can cause to condense and return wet phenomenon the material that is dried.
3, vent gas treatment
The fluidizing gas that drying machine comes out is being carried the mud subparticle secretly and moisture evaporated is left drying sludge, enter cyclone separator and carry out the solid separation, fine grained after the separation reclaims, the gas of discharging enters the water-bath tower, the water-bath tower adopts second pond water outlet upstream injection, remaining subparticle in the gas and dissolved matter are carried out the water-bath capture filter, the tower of water-bath simultaneously is equipped with active carbon filler, further carry out biofiltration and chemical filtering, the tail gas that drying machine is discharged carries out the deodorizing processing.The water-bath tower also has refrigerating function to tail gas, and fluidizing gas is after condensation, and temperature is cooled to 60 ℃ by 100 ℃, then along with shower water is back to sewage treatment plant.In addition, also be provided with medicament deodorizing stand-by provision,, can take the mode of a small amount of spray deodorant, eliminate stink, exhaust emissions is up to state standards if the tail gas of discharging still has residual stink.
4, performance analysis
Present embodiment is with over dry sludge quantity 1380kg/h, initial water content 83%, whole water content 40% is an example, analyze with this energy balance and economy circulation technology in sludge drying of the present invention+burning, please refer to energy balance figure shown in Figure 2 and Fig. 3, economic analysis shown in Figure 4: adopt sewage sludge harmlessness treatment process of the present invention, the processing cost of dried mud per ton is 48.7 yuan/ton, and amounting to cost of sewage disposal is 0.158 yuan/m
3, the reducing sludge volume rate reaches 80%, has effectively reduced the energy consumption and the cost of Treatment of Sludge.
Claims (2)
1. a sewage sludge harmlessness disposing technique is characterized in that, may further comprise the steps:
(1), carry out mummification, drying machine adopts rotary wind type to force fluidization to scrape the wall type drying machine, and dryer inner is divided into three working chambers: the first working chamber cavity temperature is at 200 ℃, and the mud temperature is 45 ℃～50 ℃ with sending into drying machine after the sludge dewatering treatment; The second working chamber cavity temperature is at 180 ℃, and the mud temperature is 45 ℃～50 ℃; The 3rd working chamber cavity temperature is 130 ℃, the mud temperature is no more than 50 ℃, drying mode adopts the high-temperature hot-air convective drying, mud is by the charging of drying machine one bottom portion, upwards throwing under the rotor effect, hot blast enters drying machine by sewage sludge feed tube top, and is directly contacted by the material of throwing, material travels forward under the effect of rotor and hot blast, realizes the matter heat exchange; After the mummification of drying machine, sludge moisture content is 40%～50%;
(2), get to enter in the hot-blast stove after mud after 40～60% mummification and bituminous coal are mixed and burn, all the other mud outward transports are stacked, bituminous coal and mud mixed ratio are 0.25～1, burn the heat that the produced form supply drying machine with hot-air;
(3), enter cyclone separator and carry out dust removal process from the drying machine tail gas discharged after, enter the water-bath tower through air-introduced machine, handle the back and discharge through cooling, deodorizing.
2. a kind of sewage sludge harmlessness disposing technique according to claim 1 is characterized in that: described hot-blast stove adopts the mud coal gasification furnace, and gasification furnace is made up of body of heater, combustion chamber, heat accumulation chamber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100704777A CN101139158B (en) | 2007-08-08 | 2007-08-08 | Sewage sludge harmlessness disposing technique |
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| CN2007100704777A CN101139158B (en) | 2007-08-08 | 2007-08-08 | Sewage sludge harmlessness disposing technique |
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| CN101139158B true CN101139158B (en) | 2010-12-01 |
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Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102725237A (en) * | 2009-08-30 | 2012-10-10 | 工业研究与发展基金会有限公司 | Method and system for treating sewage sludge |
| CN101694299A (en) * | 2009-10-21 | 2010-04-14 | 吴跃平 | Method for eliminating sludge through combustion |
| CN102140002A (en) * | 2010-02-03 | 2011-08-03 | 上海瑞惠机械设备制造有限公司 | Closed machinery incineration treatment method for half-dry sludge |
| CN102191085A (en) * | 2010-03-04 | 2011-09-21 | 北京中矿环保科技股份有限公司 | Method for using sludge to produce coal gas |
| CN101813316B (en) * | 2010-04-19 | 2011-07-27 | 山东天力干燥股份有限公司 | Municipal sludge drying and incineration system and treatment process thereof |
| CN102476907B (en) * | 2010-11-25 | 2014-03-19 | 溧阳正昌干燥设备有限公司 | Method of high-efficiency high-speed environmentally-friendly energy-saving sludge treatment system |
| CN102068870A (en) * | 2010-12-02 | 2011-05-25 | 北京机电院高技术股份有限公司 | Complete sludge paddle anhydrated carrier gas treatment device and method |
| CN102537979A (en) * | 2010-12-07 | 2012-07-04 | 福建省丰泉环保控股有限公司 | Method for integrating sludge drying and waste incineration |
| CN102445065B (en) * | 2011-10-20 | 2014-04-02 | 北京化工大学 | Slurry drying and recycling method in coal washery |
| CN103524013A (en) * | 2013-10-12 | 2014-01-22 | 天通新环境技术有限公司 | Wet sludge treatment method and equipment thereof |
| CN104587808A (en) * | 2013-10-30 | 2015-05-06 | 杭州楚天科技有限公司 | Sludge drying tail gas treatment apparatus and treatment method thereof |
| CN103708701A (en) * | 2013-12-31 | 2014-04-09 | 一重集团大连设计研究院有限公司 | After-treatment system of dried fine-powder sludge and treatment method |
| ES2555005B2 (en) * | 2014-06-24 | 2016-06-23 | Universidad De Huelva | Procedure for obtaining modified bituminous binder with sludge |
| CN106010659B (en) * | 2016-07-20 | 2018-12-14 | 广州薪光合环保技术有限公司 | Sludge dries gasification process certainly |
| CN109609230B (en) * | 2018-12-29 | 2020-08-18 | 肇庆市珈旺环境技术研究院 | Harmless and resource utilization method for printing and dyeing sludge |
| CN111238063A (en) * | 2020-03-17 | 2020-06-05 | 中国华能集团清洁能源技术研究院有限公司 | Sludge and slime drying device with energy stored by solar molten salt and operation method |
| CN112857003A (en) * | 2021-01-08 | 2021-05-28 | 中国矿业大学 | Drying and quality-improving system and method for lump coal and coal slime |
| CN115849650A (en) * | 2023-03-08 | 2023-03-28 | 山东驰盛新能源设备有限公司 | Municipal sludge treatment method |
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