CN102607043B - 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 PDFInfo
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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
Technical field
The method that the present invention relates to sewage sludge combustion stability disposal of solid refuse and suppress the discharge of dioxin in solid waste burning process, particularly relates 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.The basic procedure refuse of CIU enters incinerator by batcher and carries out pyrolysis/burning, and lime-ash enters incinerator bottom slag extractor, and flue gas enters flue; For controlling generation and the discharge of dioxin, on hazardous solid waste incinerator, need to utilize water spray measure to realize the quenching of flue gas, flue gas drops to 200～250 ℃ fast; Flue gas enters except acid tower again, utilizes alkaline matter to realize acid-base neutralization, further controls acid atmosphere; Except after acid tower, generally also needing to spray a certain amount of activated carbon (100～300mg/Nm
3), realize the absorption and control discharge to heavy metal, dioxin organic pollution; Flue gas enters sack cleaner again, realizes dedusting, finally by chimney, enters atmosphere.
The problem that solid waste incinerator exists at present mainly comprises:
The Pollutant emission concentrations such as the sour gas that 1, burning produces and dioxin are higher, control difficulty, and equipment and environment are all worked the mischief;
2, unstable due to waste component and calorific value, the fluctuation of refuse amount is large, efficiency of combustion is low, disposal of pollutants is high, also cause 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, incineration of waste process control of dioxins technology mainly comprises that stokehold refuse compatibility technology, combustion stability technology, pollutant generate inhibition technology, adsorption technology and catalytic degradation technology at present.Generate inhibition technology mainly by adding sulfur-bearing, nitrogenous and alkaline matter.But the application of above-mentioned technology is less or be mainly active carbon adsorption technology effectively, but active carbon use cost is very high, is that a kind of passive and cost is compared with high-tech.In municipal solid waste on fluidized bed incineration technology, can add a certain amount of coal and carry out auxiliary combustion, be proved sulphur in coal the discharge of dioxin has been had to obvious inhibitory action, but because raising and the coal price of refuse thermal value rises steadily, using the mode of coal-based inhibition will gradually reduce simultaneously can increase operating cost.In economic and practical efficient Novel furnace, retarding agent still lacks very much;
4, relative domestic waste incineration, dangerous waste incinerator capacity is less, and processing capacity is substantially in 5-60 ton per day scope, and the steam grade of generation is low, and waste heat cannot be realized utilization.
On the other hand, sewage sludge is also the current overall situation challenge facing, and nearly 1,000 ten thousand tons of the output of sanitary sewage mud is often only by China.Sewage sludge is due to self particularity and harmfulness, and processing requirements and difficulty are all larger.Sludge treatment is mainly security landfill and anhydration and incineration, and sludge anhydration burning technology has obtained application preferably at present.Mud is that sewage produces in biological cleaning process, and the inorganic nitrogen in sewage, phosphorus etc. are converted into organic nitrogen and the organophosphor in mud, and in dewatered sludge, the content of nitrogen can reach more than 4%, the content of sulphur also nearly 1%.Sludge anhydration burning process can be to comprise that the various ways of ammonia discharges a certain amount of nitrogen and sulphur.Other solid waste is very low relatively for mud chlorinity, and in sludge incineration flue gas, dioxin concentration is lower than discharge standard.
The nitrogen producing in mud drying process and sulphur all can be applied to suppress in incineration of waste process generation and the discharge of dioxin, realize efficient emission control cheaply.And more than generally the over dry calorific value of sewage sludge can reach 3000kcal/kg, more than the sludge calorific value of 40% moisture content also can reach 1500kcal/kg, can be advantageously applied to 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 control of dioxins technology.
Summary of the invention
The technical problem to be solved in the present invention is, overcome deficiency of the prior art, for the seriousness of current solid waste burning dioxin problem, the unsettled present situation of trash burning, provides the collaborative combustion stability solid waste of a kind of mud and suppresses dioxin method simultaneously.
For solving its technical problem, solution of the present invention is:
The collaborative combustion stability solid waste of a kind of mud is provided and suppresses dioxin method, comprise: the flue position 800～1000 ℃ of conventional solid waste incinerator furnace outlets arranges flue gas outlet, the high-temperature flue gas of drawing directly enters sludge drying device mud is carried out to direct heat drying and other treatment; The low temperature mummification gas that mummification produces, after cyclone separator, is reintroduced back to the flue position of 500～600 ℃ of incinerator furnace outlets by air-introduced machine; The dewatered sludge that sludge drying device and cyclone separator are collected is worked in coordination with burning for sending into incinerator after evenly mixing with solid waste.
In the present invention, by the control valve being contained in before sludge drying device, control the flue gas flow of drawing, make the mummification temperature degree of sludge drying device outlet be controlled at 150～300 ℃.
In the present invention, the entrance of high-temperature flue gas and sludge inlet are positioned at same one end of sludge drying device to realize following current mummification, prevent dewatered sludge directly burning in sludge drying device.
In the present invention, regulate the output of dewatered sludge by controlling the inventory of sludge inlet, it is stand-by that the dewatered sludge that sludge drying device and cyclone separator produce is transported to dewatered sludge storehouse after collecting.
In the present invention, control the mixed proportion of dewatered sludge and solid waste, make in mixture the molal quantity of nitrogenous+sulphur (dewatered sludge)/(molal quantity that solid waste is chloride) be not less than 0.5.
In the present invention, in the dewatered sludge after mummification, the mass content of moisture is lower than 40%.
Further, it is a kind of for realizing the device of preceding method that the present invention also provides, and comprises conventional solid waste incinerator; Flue position 800～1000 ℃ of incinerator furnace outlets arranges flue gas outlet, and flue gas outlet is connected to sludge drying device by pipeline, and flue gas intake and the sludge inlet of sludge drying device are positioned at same one 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 by pipeline; Solid outlet is established in the bottom of cyclone separator, and cyclone separator gas vent is connected to the flue position of 500～600 ℃ of incinerator furnace outlets by pipeline.
In the present invention, on the pipeline between described flue gas outlet and sludge drying device, control valve is set.
In the present invention, described sludge drying device is direct swinging drying device.
In the present invention, the solid outlet of the outlet of the dewatered sludge of described 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, flue gas incineration of waste being produced carries out UTILIZATION OF VESIDUAL HEAT IN, dewatered sludge, and realized solid waste and sewage sludge harmlessness is combined disposal;
2, utilize mummification gas to introduce flue, dewatered sludge and solid waste incinerating, make nitrogen that mud discharges suppress the regeneration of dioxin in tail flue gas;
3, because dewatered sludge calorific value is high and as fuel, calorific value fluctuation in the time of can stabilization of solid incineration of waste, improves incineration of waste efficiency 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 discharge of shutdown process;
4, sludge drying has reduced flue-gas temperature, has reduced dangerous waste incinerator chilled water (chw) and has used, water conservation;
5, the present invention is specially adapted to newly-built dangerous waste incinerator, also can be applied in easily on existing danger waste burning stove, makes full use of the waste heat of incinerator, and improvement cost is low, and effect is remarkable, has a wide range of applications potentiality and prospect.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention.
In figure, Reference numeral is:
1 solid waste feeding warehouse; 2 batchers; 3 one combustion chambers (can be rotary kiln, fluid bed, grate furnace); 4 dual firing chamber; 5 control valves; 6 flue gas outlets; 7 mud dispensers; 8 direct-type sludge drying devices; 9 dewatered sludge storehouses; 10 cyclone separators; 11 mummification smoke induced draught fans; 12 quench towers; 13 mummification gas intakes; 14 except acid tower; 15 cloth bags; 16 incineration flue gas air-introduced machines; 17 chimneys.
The specific embodiment
The present invention mainly adopts high-temperature flue gas that solid waste incinerator produces to carry out direct mummification sewage sludge or by existing danger waste burning stove is carried out after certain technological transformation, mud after mummification (moisture content is lower than 40%) is put to solid waste for coexistence, realize Incineration circumstances stable; Dewatered sludge has high heating value, the feature of high nitrogen content, and the nitrogen-containing compound of generation has the ability that dioxin generates that suppresses.The present invention utilizes burning high temperature fume dewatered sludge, and the dewatered sludge of generation and refuse incinerating are disposed, and mummification gas is for suppressing generation and the discharge of incineration tail gas dioxin.By a series of coupling techniques, realize solid waste burning operating mode and stablize and suppress dioxin generation, reduce pollutant emission.
For realizing goal of the invention, the present invention reequips conventional solid waste incinerator: the flue position 800～1000 ℃ of incinerator furnace outlets arranges flue gas outlet, flue gas outlet is connected to sludge drying device by pipeline, flue gas intake and the sludge inlet of sludge drying device are positioned at same one end, to realize following current mummification, prevent dewatered sludge directly burning in sludge drying device.On pipeline between described flue gas outlet and sludge drying device, control valve is set, controls the flue gas flow of drawing, make the mummification temperature degree of sludge drying device outlet be controlled at 150～300 ℃, prevent 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 by pipeline, catches the particle of carrying secretly; Solid outlet is established in the bottom of cyclone separator, and cyclone separator gas vent is connected to the flue position of 500～600 ℃ of incinerator furnace outlets by pipeline, realizes back-end ductwork dioxin and generates control.
By the setting of said apparatus, the high-temperature flue gas of drawing directly enters sludge drying device mud is carried out to direct heat drying and other treatment; The low temperature mummification gas that mummification produces, after cyclone separator, is reintroduced back to the flue position of 500～600 ℃ of incinerator furnace outlets by air-introduced machine; The dewatered sludge that sludge drying device and cyclone separator are collected is worked in coordination with burning for sending into incinerator after evenly mixing with solid waste.By controlling the inventory of sludge inlet, regulate the output of dewatered sludge, it is stand-by that the dewatered sludge that sludge drying device and cyclone separator produce is transported to dewatered sludge storehouse after collecting.In dewatered sludge after mummification, the mass content of moisture is lower than 40%.Control the mixed proportion of dewatered sludge and solid waste, make in mixture the molal quantity of nitrogenous+sulphur (dewatered sludge)/(molal quantity that solid waste is chloride) be not less than 0.5.
Studies confirm that by experiment, the present invention has good result, and mummification gas has reached 80% to the suppression efficiency of the synthetic dioxin of flying dust, to the suppression efficiency of hexachloro-benzene, also can realize 75%, and HCl is also had to reducing effect; Dewatered sludge and refuse incinerating are disposed also and experimental results show that reducing the ideal effect of dioxin level simultaneously.Can realize twice laid and pollute and control object, meeting energy-conserving and environment-protective requirement.
Claims (8)
1. a mud is worked in coordination with combustion stability solid waste and is suppressed dioxin method, it is characterized in that, comprise: the flue position 800～1000 ℃ of conventional solid waste incinerator furnace outlets arranges flue gas outlet, the high-temperature flue gas of drawing directly enters direct rotary type sludge drying device mud is carried out to direct heat drying and other treatment; The low temperature mummification gas that mummification produces, after cyclone separator, is reintroduced back to the flue position of 500～600 ℃ of incinerator furnace outlets by air-introduced machine; The dewatered sludge that sludge drying device and cyclone separator are collected is worked in coordination with burning for sending into incinerator after evenly mixing with solid waste; Control the mixed proportion of dewatered sludge and solid waste, make in mixture the molal quantity of nitrogenous+sulphur (dewatered sludge)/(molal quantity that solid waste is chloride) be not less than 0.5.
2. method according to claim 1, is characterized in that, by the control valve being contained in before sludge drying device, controls the flue gas flow of drawing, and 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 entrance of high-temperature flue gas and sludge inlet are positioned at same one end of sludge drying device to realize following current mummification, prevents dewatered sludge directly burning in sludge drying device.
4. method according to claim 1, is characterized in that, regulates the output of dewatered sludge by controlling the inventory of sludge inlet, and it is stand-by that the dewatered sludge that sludge drying device and cyclone separator produce is transported to dewatered sludge after collecting.
5. method according to claim 1, is characterized in that, in the dewatered sludge after mummification, the mass content of moisture is lower than 40%.
6. method according to claim 1, is characterized in that, described flue gas outlet is connected to sludge drying device by pipeline, and flue gas intake and the sludge inlet of sludge drying device are positioned at same one 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 by pipeline; Solid outlet is established in the bottom of cyclone separator, and cyclone separator gas vent is connected to the flue position of 500～600 ℃ of incinerator furnace outlets by pipeline.
7. method according to claim 6, its spy is, on the pipeline between described flue gas outlet and sludge drying device, control valve is set.
8. method according to claim 6, its spy is, the dewatered sludge outlet of described sludge drying device, that the solid outlet of cyclone separator bottom is connected to dewatered sludge storehouse through transfer system is stand-by.
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| CN201210101920.3A CN102607043B (en) | 2012-04-09 | 2012-04-09 | Method and device for synergetic stable incineration of sludge and solid waste and dioxin emission suppression |
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| CN201210101920.3A CN102607043B (en) | 2012-04-09 | 2012-04-09 | Method and device for synergetic stable incineration of sludge and solid waste and dioxin emission suppression |
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| CN103047656B (en) * | 2013-01-15 | 2016-01-06 | 合肥水泥研究设计院 | Utilize the method for waste incineration and generating electricity fume afterheat burning sludge |
| CN103435249B (en) * | 2013-09-07 | 2015-02-18 | 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 |
| 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 |
| 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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