CN102140003A - Sludge drying method, incineration method, sludge incineration device, thermal power plant and system - Google Patents

Sludge drying method, incineration method, sludge incineration device, thermal power plant and system Download PDF

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Publication number
CN102140003A
CN102140003A CN2010101067373A CN201010106737A CN102140003A CN 102140003 A CN102140003 A CN 102140003A CN 2010101067373 A CN2010101067373 A CN 2010101067373A CN 201010106737 A CN201010106737 A CN 201010106737A CN 102140003 A CN102140003 A CN 102140003A
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China
Prior art keywords
sludge
drying
mud
incineration
equipment
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CN2010101067373A
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Inventor
孙浩
吴淼
巩长勇
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BEIJING ZHONGKUANG SINO-ENVIRONMENT TECHNOLOGY Co Ltd
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BEIJING ZHONGKUANG SINO-ENVIRONMENT TECHNOLOGY Co Ltd
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Priority to CN2010101067373A priority Critical patent/CN102140003A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/12Heat utilisation in combustion or incineration of waste

Abstract

The invention discloses a sludge drying method, a sludge incineration method, a sludge incineration device, a thermal power plant and a system. The sludge drying method is used for drying sludge till the moisture content of sludge is in the range of 70% to 40%. On one hand, the sludge drying method only removes moisture easily to be removed in the drying process and improves energy efficiency and time efficiency of sludge moisture removal. On the other hand, the moisture content setting also can eliminate or at least greatly reduce the potential safety hazard that explosion easily happens in the sludge drying process. The incineration method, the sludge incineration device, the thermal power plant and the system all adopt the sludge drying method.

Description

Sludge drying method, incinerating method and sludge incineration equipment, heat power plant and system
Technical field
The present invention relates to green technology, particularly relate to a kind of sludge drying method and corresponding sludge incineration method.The present invention also further relates to sludge incineration equipment, heat power plant and the system that adopts described sludge drying method.
Background technology
Along with development of science and technology and the people raising day by day to environmental requirement, ratio and the degree in the world wide sewage handled improve gradually.Mud is one of main waste that produces in the sewage treatment process.Along with development of urbanization and progress of industry, the output of mud is increasing, and the requirement of mud being carried out innoxious, minimizing, stabilization, disposal of resources is also more and more urgent.And sludge drying is an importance of present sludge disposal.
Mud has high-moisture percentage and low heat value, and for example aspect water ratio, the water ratio of mud can reach 96%-98%.Therefore, first step that mud is handled is sludge drying often, and the mud after the mummification can carry out subsequent disposal and/or use, for example carries out landfill, burning, compost and brickmaking or the like.In the prior art, with sludge drying to water ratio be usually about 35% or lower after carry out subsequent disposal again.This kind drying method can reduce the water content through dewatered sludge to greatest extent, to reduce the unit weight calorific value of subsequent transportation or conveying cost, raising dewatered sludge.The shortcoming of this kind mummification mode is: blast easily in drying process, be easy to generate dust pollution, and drying process consumes more heat, economic inefficiencies.
Therefore, wishing has a kind of novel sludge drying method to come mud is carried out more effective drying and other treatment, with save energy with reduce cost.
Summary of the invention
The objective of the invention is to: a kind of new sludge drying method is provided, saves the energy consumption in the mud drying process, and reduce cost and increase production security.
For achieving the above object, the invention provides a kind of method of novel sludge drying, described sludge drying method comprises sludge drying to water content is in 70%~40% the scope of sludge quality.It is pointed out that and to adopt the water content of any suitable technology (for example heating evaporation, mechanical dehydration, airing, interpolation auxiliary material, hydrolysis or pyrolysis way with and arbitrary combination mode) sludge drying to 70%~40%.
The present inventor finds that the moisture in the mud mainly contains following four kinds of existence forms: intergranular interstitial water, and it accounts for 70% of mud total moisture; Between mud granule, form contained water in some little kapillaries, be called capillary water, account for 20% of sludge water content; Be adsorbed on the moisture of particle surface, be called planar water, account for 7% of sludge water content; Be present in the water in mud granule inside or the microorganism cells, be called internal water, account for 3% of sludge water content.The inventor finds that further the difficulty of removing above-mentioned four kinds of moisture in the mud is successively in proper order: internal water>planar water>capillary water>interstitial water.Being that internal water is the most difficult removes, and removes and interstitial water is the easiest.It is pointed out that mud can also comprise the free state water that can remove through gravitational settling and mechanical effect.
The process of moisture in the mud is removed in the mummification of mud exactly, and according to the difference of moisture percentage in sewage sludge after the mummification (mass ratio), the mummification degree of mud can be divided into following three kinds substantially: moisture percentage in sewage sludge belongs to shallow mummification after the mummification between 75%~40%; Moisture percentage in sewage sludge belongs to half-driedization after the mummification about 35%; Moisture percentage in sewage sludge belongs to absolutely dryization after the mummification about 10%.In the different steps of sludge drying, the speed that dries out is different, rate-of-loss of coolant height when water ratio is high, and rate-of-loss of coolant decreases when water ratio reduces.And in the drying process of mud, along with the minimizing of water content, the difficulty of mummification is increasing; And remove the water of unit vol, the energy that is consumed is also more and more.When adopting evaporation drying, the energy that ev u moisture is consumed is also increasing.
Therefore, sludge incineration method of the present invention is brought following advantage with the water content of sludge drying to 70%~40%: on the one hand, in drying process, only the moisture of easy removal is removed, improved Energy efficiency and time efficiency that sludge water content is removed.On the other hand, described water content setting can also be eliminated or alleviated the potential safety hazard of blasting easily in the mud drying process at least greatly.
Preferably, described sludge drying to water content can be in 60%~50% the scope.When the water content of mud smaller or equal to 60% the time, it is solid-state that mud is essentially, thereby easily mud is transported and transmits, and the amount efficiency that anhydrates of unit energy is higher during with the water content of sludge drying to 60%~50%.Further preferably, sludge drying can be in to its water content in 56%~54% the scope.More preferably, can be 55% with sludge drying to water content.
The present invention also provides a kind of sludge incineration method, in this sludge incineration method, after with above-mentioned sludge drying method mud being carried out drying and other treatment, further to carrying out burning disposal through dewatered sludge.70%~40% water content makes and need not to mix burning with other fuel during in burning through dewatered sludge, but can directly burn, and the saving that this also helps the energy also helps the reduction of the cost of investment of sludge incineration treatment facility; But also reduce in the traditional sludge incineration technology easily drying process such shortcoming of blasting.
Preferably, the heat of burning sludge generation can partly or entirely be used for mud is carried out mummification.This can realize burning the recovery of the heat that produces equally, with further conserve energy.
Preferably, can burn drop into incinerator or boiler through dewatered sludge.Thereby realize the efficient burning of mud.
The present invention also provides a kind of sludge incineration equipment, and described equipment comprises: mummification equipment is used for wet sludge anhydration to water content is in 70%~40% the scope; And burning facility, its be arranged on mummification equipment near, be used for the dewatered sludge after described mummification is equipment dried is burned.Thereby described equipment carries out burning disposal in the few and safe mode of energy consumption to mud.
The present invention also provides a kind of heat power plant that comprises above-mentioned sludge incineration equipment, and a kind ofly comprises above-mentioned sludge incineration equipment.Thereby the mud that is produced is carried out burning disposal in the mode that energy consumption is few and safe.
The present invention also provides a kind of system, and it has the mud output and comprises the sludge drying equipment that is used for sludge drying to 70%~40% water content.
Description of drawings
Fig. 1 is the indicative flowchart of sludge incineration method according to one preferred embodiment of the present invention, and this sludge incineration method adopts according to sludge drying method of the present invention.
Embodiment
The sludge drying method of a specific embodiment is for being in sludge drying to water content in 70%~40% the scope of sludge quality according to the present invention.It is pointed out that and to adopt the water content of any suitable technology (for example heating evaporation, mechanical dehydration, airing, interpolation auxiliary material, hydrolysis or pyrolysis way with and arbitrary combination mode) sludge drying to 70%~40%.Described mud can be the mud of any kind, for example can be city dehydrated sludge and industrial dewatered sludge (as paper mill sludge, printing and dyeing sludge etc.).It is pointed out that if do not particularly point out the moisture in the term in the literary composition " mud " does not comprise can be through the free state water of gravitational settling and mechanical effect removal.Method of the present invention can also be applicable to, domestic sludge, petrochemical sludge, leather mud and other chemical engineering sludge.
The mode of described wet mud being carried out mummification can comprise: (advantage: speed is fast for heating evaporation; The energy consumption height), mechanical dehydration (advantage: the efficient of when high-moisture percentage, anhydrating high shortcoming:, but can only obtain higher water ratio, for example, be difficult to realize the water ratio below 60% usually), (advantage: energy consumption is low, is particularly suited for using under dry and hot environment in airing; But time efficiency is low), (advantage: speed is fast to add auxiliary material; The cost height), hydrolysis and/or pyrolysis (advantage: have the high efficient of anhydrating when water ratio is low, the shortcoming cost is higher) or the like shortcoming:.Thereby with the mummification of efficient manner realization to mud.
Described sludge drying method brings following advantage: on the one hand, in drying process, only the moisture of easy removal is removed, improved Energy efficiency and time efficiency that sludge water content is removed.On the other hand, described water content setting is also eliminated or has been alleviated the potential safety hazard of blasting easily in the mud drying process at least greatly.
More specifically, water content by mud to be burnt (through dewatered sludge) is set to 70%~40% (the mummification target of mummification step in other words is set to 70%~40% water content), on the one hand, in drying process, only the moisture of easy removal is removed, improved the energy consumption efficient and the time efficiency of moisture removal, promptly removed more water with less energy and the time of lacking.For example, during drying machine (mud being carried out the equipment of mummification) operation, consume energy such as electric energy.(target water content is 75%~40%) removed energy that the unit water yield consumed and is approximately when carrying out half-driedization catabiotic 1/2 when carrying out shallow mummification.And same equipment yield (through dewatered sludge) but can improve 1.2~1.5 times.On the other hand, described water content (70%~40%) makes mud need not to mix burning with other fuel when burning, but can directly burn, this also helps the saving of the energy, also help the reduction of the cost of investment of sludge incineration treatment facility, investment and maintenance cost that for example can the fuel economy transportation equipment.
It is pointed out that also described water content setting also eliminates or alleviated the potential safety hazard of blasting easily in the existing sludge incineration equipment at least greatly.As previously mentioned, sludge drying method of the prior art is about 35% or lower with sludge drying to water ratio.Carry out subsequent disposal or utilization then, for example carry out burning disposal.The inventor notices: along with the raising of sludge drying degree, more and more be easy to produce combustible dust, thereby the possibility of blasting increases sharply, must take enough measures for the prevention of explosion to ensure safety in production.Especially when mud carries out absolutely dryization and half-driedization, be very easy to produce combustible dust, when mud is carried out shallow mummification, then seldom produce combustible dust usually.Therefore, the target water content of mummification is set to 70%~40%, also help drying process safety carry out.
Below in conjunction with accompanying drawing an embodiment of the present invention is described.As shown in fig. 1, sludge incineration method comprises two steps according to an embodiment of the invention: 1) wet mud is carried out mummification (in other words, carrying out shallow mummification); And 2) to burning of obtaining in the step 1) through dewatered sludge.Step 1) is the indicated step of number in the figure 2, step 2) be the indicated steps of numbering 3 among the figure.In step 1), be to be in 70%~40% the scope of sludge quality with wet sludge anhydration to its water content of back.What number in the figure 1 was indicated is the point of beginning of sludge incineration method of the present invention, promptly wet mud.
As previously mentioned, the water content of mud is very high, even the water ratio of mud is also still very high after mechanical dehydration is handled, generally at 75%-85%.Obviously, the direct burning of mud is infeasible.At present, topmost burning mode has two kinds.First kind of mode is mud to be mixed together with other fuel burn, and its shortcoming is: need special fuel transport and plenum system, and, the amount of required fuel is bigger, the transportation cost height, and fuel consumption causes very high cost, and mud handling capacity is restricted.The second way is that (moisture percentage in sewage sludge is about 35% or lower after the mummification) behind the sludge drying burned again, and its shortcoming is: blast easily in drying process, be easy to generate dust pollution, and the more heat of mummification consumption, the mummification cost is too high.
Burning through dewatered sludge mainly can be carried out in incinerator or boiler (being to burn in boiler shown in the figure), in the burning process of mud, combustiblecomponents in the mud can produce heat, moisture in the mud then can absorb heat, water ratio is high more, heat production is few more, and it is many more to absorb heat, and the difference of the heat of generation and the heat of absorption is the clean quantity of heat given up of mud.For the butt calorific value is the mud of 3000kcal/kg, when water ratio is 75%, is the calorific value trim point; When water ratio was 60%, the burning of mud per ton contribution calorific value was 530,000 kcal; When water ratio was 50%, the burning of mud per ton contribution calorific value was 910,000 kcal; When water ratio was 40%, the burning of mud per ton contribution calorific value was 1,290,000 kcal.Can also draw thus, when water ratio was lower than 75%, mud can burn voluntarily, rather than must mix burning with coal or other fuel.The present invention is chosen as and is no more than 70%, is beneficial to the carrying out of sludge incineration.
Incinerator or the boiler wet mud that both can directly burn, the mud of half-driedization, absolutely dryization of also can burning.The temperature of sludge incineration is arranged on about about 1300 ℃ usually, and this helps the stable burning of mud on the one hand, on the other hand, helps the decomposition of obnoxious flavour.When the clean quantity of heat given up of mud is not enough to keep the incendiary temperature, must mixes and burn a certain proportion of other fuel.The clean quantity of heat given up of mud is high more, and it is low more to mix the ratio of burning other fuel, if whole burning sludges in the stove, when moisture percentage in sewage sludge 65% when above, furnace temperature can be reduced to below 900 ℃.If with the coal multifuel combustion, the mud ratio in 30% is added the shallow dewatered sludge of water ratio between 70%~40%, and it is no problem keeping enough furnace temperature.The ratio of mixing burning is few more, and the economy of sludge incineration is good more, considers the thermo-efficiency of boiler, and the cost of drying sludge, in a preferred embodiment of the present invention, drying sludge to water ratio 50%~60% is burnt to it again.Described water content makes mud the time need not to mix burning with other fuel in burning, but can directly burn, and the saving that this also helps the energy also helps the reduction of the cost of investment of sludge incineration treatment facility.
In the method according to a preferred embodiment, the heat that burning sludge produces partly or entirely is used for wet mud is carried out preheating and/or mummification.Thereby can realize burning the recovery of the heat that produces, with further conserve energy.
The present invention also provides a kind of sludge incineration equipment, and described equipment comprises: mummification equipment is used for wet sludge anhydration to water content is in 70%~40% the scope; And burning facility, its be arranged on mummification equipment near, be used for the dewatered sludge after described mummification is equipment dried is burned.Thereby described equipment carries out burning disposal in the few and safe mode of energy consumption to mud.Described burning facility for example is incinerator or boiler.
The present invention also provides a kind of heat power plant that comprises above-mentioned sludge incineration equipment, and a kind of system that the mud output is arranged (for example, sewage work, paper mill, printing and dyeing mill or plant etc.) that adopts above-mentioned sludge drying method.Thereby the drying and other treatment that mud is optimized in the few and safe mode of energy consumption.
The present invention also provides a kind of sludge incineration factory, it comprises sludge drying equipment and boiler, mud is earlier after the shallow mummification of sludge drying equipment, be delivered to boiler and burn, burn the part or all of heat that produces and directly and/or indirectly conduct to mummification or the preheating that sludge drying equipment is used for mud.Described sludge incineration factory can comprise heat power plant, power station, sewage-farm, sewage work, paper mill, printing and dyeing mill, plant etc.The combustion equipment of described shallow dewatered sludge can comprise thermal source boiler, incinerator.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.

Claims (10)

1. a sludge drying method is characterized in that, sludge drying is in to its water content in 70%~40% the scope.
2. sludge drying method as claimed in claim 1 is characterized in that, sludge drying is in to its water content in 60%~50% the scope.
3. sludge drying method as claimed in claim 1 is characterized in that, sludge drying is in to its water content in 56%~54% the scope.
4. as each described sludge drying method among the claim 1-3, it is characterized in that, carry out sludge drying with heating evaporation, mechanical dehydration, airing, interpolation auxiliary material, hydrolysis and/or pyrolysis way.
5. a sludge incineration method is characterized in that, each described sludge drying method carries out after the drying and other treatment mud in claim 1-4, to carrying out burning disposal through dewatered sludge.
6. sludge incineration method as claimed in claim 5 is characterized in that, the heat that burning sludge produces partly or wholly is used for mud is carried out described drying and other treatment.
7. sludge incineration method as claimed in claim 5 is characterized in that, in incinerator or boiler to carrying out described burning through dewatered sludge.
8. a sludge incineration equipment is characterized in that, comprising:
Mummification equipment is used for wet sludge anhydration to water content is in 70%~40% the scope; And
Burning facility, its be arranged on mummification equipment near, be used for the dewatered sludge after described mummification is equipment dried is burned.
9. heat power plant, it comprises a sludge incineration equipment, it is characterized in that, described sludge incineration equipment comprises:
Mummification equipment is used for wet sludge anhydration to water content is in 70%~40% the scope; And
Burning facility, its be arranged on described mummification equipment near, be used for the dewatered sludge after described mummification is equipment dried is burned.
10. system, it has the mud output and comprises a sludge drying equipment, it is characterized in that, and described mummification equipment is used for sludge drying to water content is in 70%~40% the scope.
CN2010101067373A 2010-02-03 2010-02-03 Sludge drying method, incineration method, sludge incineration device, thermal power plant and system Pending CN102140003A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102878570A (en) * 2012-10-10 2013-01-16 中国石油化工股份有限公司 Method and equipment for treating chemical sludge by blending and combusting chemical sludge in pulverized coal furnace
CN103159274A (en) * 2011-12-09 2013-06-19 财团法人工业技术研究院 Method for treating high salinity concentration wastewater
CN109336352A (en) * 2018-11-05 2019-02-15 李舒馨 A kind of method for sludge treatment
CN109609230A (en) * 2018-12-29 2019-04-12 肇庆市珈旺环境技术研究院 A kind of printing and dyeing sludge is harmless, resource utilization method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103159274A (en) * 2011-12-09 2013-06-19 财团法人工业技术研究院 Method for treating high salinity concentration wastewater
CN102878570A (en) * 2012-10-10 2013-01-16 中国石油化工股份有限公司 Method and equipment for treating chemical sludge by blending and combusting chemical sludge in pulverized coal furnace
CN109336352A (en) * 2018-11-05 2019-02-15 李舒馨 A kind of method for sludge treatment
CN109609230A (en) * 2018-12-29 2019-04-12 肇庆市珈旺环境技术研究院 A kind of printing and dyeing sludge is harmless, resource utilization method
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

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Application publication date: 20110803