CN102607043A - Method and device for synergetic stable incineration of sludge and solid waste and dioxin emission suppression - Google Patents

Method and device for synergetic stable incineration of sludge and solid waste and dioxin emission suppression Download PDF

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Publication number
CN102607043A
CN102607043A CN2012101019203A CN201210101920A CN102607043A CN 102607043 A CN102607043 A CN 102607043A CN 2012101019203 A CN2012101019203 A CN 2012101019203A CN 201210101920 A CN201210101920 A CN 201210101920A CN 102607043 A CN102607043 A CN 102607043A
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sludge
solid waste
drying device
flue gas
outlet
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CN102607043B (en
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李晓东
严建华
陆胜勇
陈彤
严密
池涌
王飞
倪明江
岑可法
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The invention relates to the solid waste incineration technology, and aims to provide a method and a device for synergetic stable incineration of sludge and solid waste and dioxin emission suppression. The method includes the steps: arranging a flue gas guide outlet at a 800-1000 DEG C flue position of a hearth outlet of a conventional solid waste incinerator, and leading guide-out high-temperature flue gas to enter a sludge dryer for direct heat drying of sludge; subjecting to low-temperature dried air generated by drying to a cyclone separator, and re-guiding the low-temperature dried air treated by the cyclone separator to a 500-600 DEG C flue position of the hearth outlet of the incinerator by a draught fan; and uniformly mixing dry sludge collected by the sludge dryer and the cyclone separator with the solid waste, and conveying the mixtures into the incinerator for synergetic incineration. The method and the device have the advantages that the waste heat of the flue gas generated by waste incineration is used to dry sludge so that harmless combined treatment of the solid waste and the sludge is realized; by means of guiding dried gas into the flue and synergetic incineration of the dry sludge and the solid waste, regeneration of dioxin in tail flue gas is suppressed by nitrogen released by the sludge; and the device is low in improvement cost and remarkable in effect.

Description

Mud is collaborative to be stablized incinerating solid waste and suppresses dioxin discharge method and device
Technical field
The present invention relates to the discharging that sewage sludge is stablized incineration disposal solid waste and suppressed dioxin in the solid waste burning process, particularly relate to the dioxin restraining technology in a kind of solid waste burning process of high efficiency, low cost.
Background technology
Burning is the current solid waste main disposal options of (mainly referring to domestic waste, hazardous waste, clinical waste etc.), can realize refuse quick decrement, subtract appearance, degraded toxicity and chemical hazard property.The basic procedure refuse of CIU gets into incinerator through batcher and carries out pyrolysis/burning, and lime-ash gets into incinerator bottom slag extractor, and flue gas gets into flue; Be the generation and the discharging of control dioxin, on the hazardous solid waste incinerator, need utilize the water spray measure to realize the quenching of flue gas, flue gas drops to 200~250 ℃ fast; Flue gas gets into except that acid tower again, utilizes alkaline matter to realize acid-base neutralization, further controls acid atmosphere; After removing acid tower, generally also need spray a certain amount of activated carbon (100~300mg/Nm 3), realize heavy metal, dioxin organic pollutant adsorption control discharging; Flue gas gets into sack cleaner again, realizes dedusting, after chimney enters atmosphere.
The problem of solid waste incinerator existence at present mainly comprises:
1, pollutant emission concentration such as the sour gas of burning generation and dioxin are higher, and the control difficulty all works the mischief to equipment and environment;
2, because the instability of waste component and calorific value; The amount of waste fluctuation is big, and efficiency of combustion is low, disposal of pollutants is high, also causes the incinerator start and stop frequent simultaneously; Reduce service life of equipment; And because the burning of shutdown process kind is insufficient, pollutant emission concentration is high especially, can be several times to tens times of normal operating condition;
3, at present incineration of waste process dioxin control technology mainly comprises stokehold refuse compatibility technology, stablize incineration technology, pollutant generates that inhibitions is technological, adsorption technology and catalytic degradation are technological.It is main through adding sulfur-bearing, nitrogenous and alkaline matter to generate the technology of inhibition.But above-mentioned technical application is less or mainly be charcoal absorption technology effectively, but the active carbon use cost is very high, is that a kind of passive and cost is than high-tech.Can add a certain amount of coal in the house refuse fluidized combustion technology and come auxiliary combustion; Be proved sulphur in the coal the discharging of dioxin has been had the obvious suppression effect; But because the raising and the coal price of refuse thermal value rise steadily, using the mode of coal-based inhibition will gradually reduce simultaneously can increase operating cost.Retarding agent still lacks very much in the economic and practical novel efficiently stove;
4, relative domestic waste incineration, the dangerous waste incinerator capacity is less, and in 5-60 ton per day scope, the steam grade of generation is low basically for the processing capacity, and waste heat can't be realized utilizing.
On the other hand, sewage sludge also is a current overall situation challenge that faces, and China every year is nearly 1,000 ten thousand tons of the output of sanitary sewage mud only.Sewage sludge is owing to self particularity and harmfulness, and processing requirements and difficulty are all bigger.Sludge treatment is mainly security landfill and anhydration and incineration, and the sludge anhydration burning technology has obtained using preferably at present.Mud is that sewage produces in the biological cleaning process, and the inorganic nitrogen in the sewage, phosphorus etc. are converted into organic nitrogen and the organophosphor in the mud, and the content of nitrogen can reach more than 4% in the dewatered sludge, the content of sulphur also nearly 1%.The sludge anhydration burning process can discharge a certain amount of nitrogen and sulphur with the various ways that comprises ammonia.Relative other of mud chlorinity gives up very low admittedly, and dioxin concentration is lower than discharge standard in the sludge incineration flue gas.
Nitrogen that produces in the mud drying process and sulphur all can be applied to suppress in the incineration of waste process generation and the discharging of dioxin, realize efficient cheaply emission control.And the over dry calorific value of general sewage sludge can reach more than the 3000kcal/kg, and the sludge calorific value of 40% moisture content also can reach more than the 1500kcal/kg, can be advantageously applied to the stabilization of solid incineration of waste.
Therefore based on above background, the present invention proposes a kind of low cost, oligosaprobic associating Waste disposal and dioxin control technology.
Summary of the invention
The technical problem that the present invention will solve is; Overcome deficiency of the prior art; To the seriousness of current solid waste burning dioxin emission problem, the unsettled present situation of trash burning provides a kind of mud collaborative incinerating solid waste and inhibition dioxin discharge method and the device stablized simultaneously.
For solving its technical problem, solution of the present invention is:
Provide a kind of mud collaborative incinerating solid waste and the inhibition dioxin discharge method stablized; Comprise: the flue position 800~1000 ℃ of the solid waste incinerator furnace outlets of routine is provided with the flue gas outlet, and the high-temperature flue gas of drawing directly gets into the sludge drying device mud is carried out the direct heat drying and other treatment; The low temperature mummification gas that mummification produces is introduced the flue position of 500~600 ℃ of incinerator furnace outlets again by air-introduced machine behind cyclone separator; The dewatered sludge that sludge drying device and cyclone separator are collected is used for and sends into incinerator after solid waste evenly mixes and work in coordination with burning.
Among the present invention,, make the mummification temperature degree of sludge drying device outlet be controlled at 150~300 ℃ through the flue gas flow that the control valve control that is contained in before the sludge drying device is drawn.
Among the present invention, the inlet of high-temperature flue gas and sludge inlet are positioned at the same end of sludge drying device to realize the following current mummification, prevent dewatered sludge directly burning in the sludge drying device.
Among the present invention, through the output that the inventory of control sludge inlet is regulated dewatered sludge, it is for use to be transported to dewatered sludge after the dewatered sludge that sludge drying device and cyclone separator produce is collected.
Among the present invention, the mixed proportion of control dewatered sludge and solid waste, make in the mixture molal quantity of nitrogenous+sulphur (dewatered sludge)/(solid waste chloride molal quantity) be not less than 0.5.
Among the present invention, the mass content of moisture is lower than 40% in the dewatered sludge after the mummification.
Further, the present invention also provides a kind of device that is used to realize preceding method, comprises conventional solid waste incinerator; Flue position 800~1000 ℃ of incinerator furnace outlets is provided with the flue gas outlet, and the flue gas outlet is connected to the sludge drying device through pipeline, and the flue gas intake and the sludge inlet of sludge drying device are positioned at same end; The afterbody of sludge drying device is established dewatered sludge outlet and the outlet of mummification gas, and the outlet of mummification gas is connected to cyclone separator through pipeline; Solid outlet is established in the bottom of cyclone separator, and the cyclone separator gas vent is connected to the flue position of 500~600 ℃ of incinerator furnace outlets through pipeline.
Among the present invention, on the pipeline between said flue gas outlet and the sludge drying device control valve is set.
Among the present invention, said sludge drying device is direct swinging drying device.
Among the present invention, the solid outlet of the outlet of the dewatered sludge of said sludge drying device, cyclone separator bottom is connected to refuse material hole through transfer system.
Compared with prior art, beneficial effect of the present invention is:
1, the flue gas that incineration of waste is produced carries out UTILIZATION OF VESIDUAL HEAT IN, dewatered sludge, and realized that solid waste and sewage sludge harmlessness unite disposal;
2, utilize mummification gas to introduce flue, dewatered sludge and solid waste incinerating, the nitrogen that mud is discharged suppresses the regeneration of dioxin in the tail flue gas;
3, because the dewatered sludge calorific value is high and act as a fuel; But the fluctuation of the calorific value during the stabilization of solid incineration of waste improves incineration of waste efficient and reduces pollutant emission, and can reduce the start-stop time of incinerator; Improve the utilization rate of equipment, also reduced the pollutant ultrahigh concentration discharging of shutdown process;
4, sludge drying has reduced flue-gas temperature, has reduced the dangerous waste incinerator chilled water (chw) and has used, the protection water resource;
5, the present invention is specially adapted to newly-built dangerous waste incinerator, also can be applied in easily on the existing danger waste burning stove, makes full use of the waste heat of incinerator, and improvement cost is low, and effect is remarkable, has application potential and prospect widely.
Description of drawings
Fig. 1 is a process chart of the present invention.
Reference numeral is among the figure:
1 solid waste feeding warehouse; 2 batchers; Combustion chambers 3 one (can be rotary kiln, fluid bed, grate furnace); 4 dual firing chamber; 5 control valves; 6 flue gas outlets; 7 mud dispensers; 8 mud direct-type drying devices; 9 dewatered sludge storehouses; 10 cyclone separators; 11 mummification smoke induced draught fans; 12 quench towers; 13 mummification gas intakes; 14 remove acid tower; 15 cloth bags; 16 incineration flue gas air-introduced machines; 17 chimneys.
The specific embodiment
The high-temperature flue gas that the present invention mainly adopts solid waste incinerator to produce carries out direct mummification sewage sludge or through after existing danger waste burning stove is carried out certain technological transformation; Mud after the mummification (moisture content is lower than 40%) is used for coexistence puts solid waste, realize burning operating mode and stablize; Dewatered sludge has high heating value, the characteristics of high nitrogen content, and the nitrogen-containing compound of generation has the ability that dioxin generates that suppresses.The present invention utilizes the burning high temperature fume dewatered sludge, and the dewatered sludge of generation and refuse incinerating are disposed, and mummification gas then is used for suppressing the generation and the discharging of incineration tail gas dioxin.Through a series of coupling techniques, realize that the solid waste burning operating mode is stable and suppress the dioxin generation, reduce pollutant emission.
For realizing goal of the invention; The present invention reequips the solid waste incinerator of routine: the flue position 800~1000 ℃ of incinerator furnace outlets is provided with the flue gas outlet; The flue gas outlet is connected to the sludge drying device through pipeline; The flue gas intake and the sludge inlet of sludge drying device are positioned at same end, to realize the following current mummification, prevent dewatered sludge directly burning in the sludge drying device.On the pipeline between said flue gas outlet and the sludge drying device control valve is set, the flue gas flow that control is drawn makes the mummification temperature degree of sludge drying device outlet be controlled at 150~300 ℃, prevents overheated pyrolysis.The afterbody of sludge drying device is established dewatered sludge outlet and the outlet of mummification gas, and the outlet of mummification gas is connected to cyclone separator through pipeline, catches the particle of carrying secretly; Solid outlet is established in the bottom of cyclone separator, and the cyclone separator gas vent is connected to the flue position of 500~600 ℃ of incinerator furnace outlets through pipeline, realizes that the back-end ductwork dioxin generates control.
Through the setting of said apparatus, the high-temperature flue gas of drawing directly gets into the sludge drying device mud is carried out the direct heat drying and other treatment; The low temperature mummification gas that mummification produces is introduced the flue position of 500~600 ℃ of incinerator furnace outlets again by air-introduced machine behind cyclone separator; The dewatered sludge that sludge drying device and cyclone separator are collected is used for and sends into incinerator after solid waste evenly mixes and work in coordination with burning.Through the output that the inventory of control sludge inlet is regulated dewatered sludge, it is for use to be transported to dewatered sludge after the dewatered sludge that sludge drying device and cyclone separator produce is collected.The mass content of moisture is lower than 40% in the dewatered sludge after the mummification.The mixed proportion of control dewatered sludge and solid waste, make in the mixture molal quantity of nitrogenous+sulphur (dewatered sludge)/(solid waste chloride molal quantity) be not less than 0.5.
Confirm that through experimental study the present invention has good result, mummification gas has reached 80% to the inhibition efficient of the synthetic dioxin of flying dust, also can realize 75% to the inhibition efficient of hexachloro-benzene, and HCl is also had the reduction effect; Dewatered sludge and refuse incinerating are disposed has also simultaneously been proved reducing the ideal effect of dioxin emission level by experiment.Can realize twice laid and pollute the control purpose, meet the energy-conserving and environment-protective requirement.

Claims (10)

1. a mud is worked in coordination with and is stablized incinerating solid waste and suppress the dioxin discharge method; It is characterized in that; Comprise: the flue position 800~1000 ℃ of the solid waste incinerator furnace outlets of routine is provided with the flue gas outlet, and the high-temperature flue gas of drawing directly gets into the sludge drying device mud is carried out the direct heat drying and other treatment; The low temperature mummification gas that mummification produces is introduced the flue position of 500~600 ℃ of incinerator furnace outlets again by air-introduced machine behind cyclone separator; The dewatered sludge that sludge drying device and cyclone separator are collected is used for and sends into incinerator after solid waste evenly mixes and work in coordination with burning.
2. method according to claim 1 is characterized in that, through the flue gas flow that the control valve control that is contained in before the sludge drying device is drawn, makes the mummification temperature degree of sludge drying device outlet be controlled at 150~300 ℃.
3. method according to claim 1 is characterized in that, the inlet of high-temperature flue gas and sludge inlet are positioned at the same end of sludge drying device to realize the following current mummification, prevents dewatered sludge directly burning in the sludge drying device.
4. method according to claim 1 is characterized in that, through the output that the inventory of control sludge inlet is regulated dewatered sludge, it is for use to be transported to dewatered sludge after the dewatered sludge that sludge drying device and cyclone separator produce is collected.
5. method according to claim 1 is characterized in that, the mixed proportion of control dewatered sludge and solid waste, make in the mixture molal quantity of nitrogenous+sulphur (dewatered sludge)/(solid waste chloride molal quantity) be not less than 0.5.
6. method according to claim 1 is characterized in that the mass content of moisture is lower than 40% in the dewatered sludge after the mummification.
7. a device that is used to realize the said method of claim 1 comprises conventional solid waste incinerator; It is characterized in that in the flue position of 800~1000 ℃ of incinerator furnace outlets the flue gas outlet is set, the flue gas outlet is connected to the sludge drying device through pipeline, the flue gas intake and the sludge inlet of sludge drying device are positioned at same end; The afterbody of sludge drying device is established dewatered sludge outlet and the outlet of mummification gas, and the outlet of mummification gas is connected to cyclone separator through pipeline; Solid outlet is established in the bottom of cyclone separator, and the cyclone separator gas vent is connected to the flue position of 500~600 ℃ of incinerator furnace outlets through pipeline.
8. device according to claim 7, its spy is, on the pipeline between said flue gas outlet and the sludge drying device control valve is set.
9. device according to claim 7, its spy is that said sludge drying device is direct swinging drying device.
10. device according to claim 7, its spy is that the dewatered sludge outlet of said sludge drying device, the solid outlet of cyclone separator bottom are connected to refuse material hole through transfer system.
CN201210101920.3A 2012-04-09 2012-04-09 Method and device for synergetic stable incineration of sludge and solid waste and dioxin emission suppression Active CN102607043B (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103047656A (en) * 2013-01-15 2013-04-17 合肥水泥研究设计院 Method for utilizing smoke waste heat produced by refuse incineration electricity generation to set sludge on fire
CN103435249A (en) * 2013-09-07 2013-12-11 浙江大学 Sludge drying gas generator and control method for inhibiting emission of dioxin in flue gas
CN107504491A (en) * 2017-09-29 2017-12-22 新中天环保股份有限公司 A kind of dangerous solid waste incineration technique
CN107555755A (en) * 2017-09-21 2018-01-09 中国联合工程公司 The dioxin emission reducing device and control method of cement kiln synergic processing sludge
CN108164116A (en) * 2017-12-26 2018-06-15 湖南省湘电试验研究院有限公司 A kind of suction type sludge drying co-combustion system based on coal-burning power plant
CN109385308A (en) * 2018-11-28 2019-02-26 浙江工业大学 A kind of the double bed electricity generation system and method for coal-fired coupling domestic garbage pyrolysis
CN110220204A (en) * 2019-05-17 2019-09-10 武汉深能环保新沟垃圾发电有限公司 A kind of system and method for waste incineration cooperatively processing sludge
CN110586616A (en) * 2019-09-05 2019-12-20 浙江大学 Efficient inhibition method for dioxin regeneration in fly ash high-temperature thermal treatment process

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103047656A (en) * 2013-01-15 2013-04-17 合肥水泥研究设计院 Method for utilizing smoke waste heat produced by refuse incineration electricity generation to set sludge on fire
CN103435249A (en) * 2013-09-07 2013-12-11 浙江大学 Sludge drying gas generator and control method for inhibiting emission of dioxin in flue gas
CN107555755A (en) * 2017-09-21 2018-01-09 中国联合工程公司 The dioxin emission reducing device and control method of cement kiln synergic processing sludge
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CN108164116A (en) * 2017-12-26 2018-06-15 湖南省湘电试验研究院有限公司 A kind of suction type sludge drying co-combustion system based on coal-burning power plant
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CN110220204A (en) * 2019-05-17 2019-09-10 武汉深能环保新沟垃圾发电有限公司 A kind of system and method for waste incineration cooperatively processing sludge
CN110586616A (en) * 2019-09-05 2019-12-20 浙江大学 Efficient inhibition method for dioxin regeneration in fly ash high-temperature thermal treatment process

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