CN102875003B - Integrated technology of thermal decomposing, dry distilling and gasifying sludge and preparing of ceramsite - Google Patents

Integrated technology of thermal decomposing, dry distilling and gasifying sludge and preparing of ceramsite Download PDF

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Publication number
CN102875003B
CN102875003B CN201210434632XA CN201210434632A CN102875003B CN 102875003 B CN102875003 B CN 102875003B CN 201210434632X A CN201210434632X A CN 201210434632XA CN 201210434632 A CN201210434632 A CN 201210434632A CN 102875003 B CN102875003 B CN 102875003B
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China
Prior art keywords
sludge
pyrogenation
carbonization
haydite
gasification
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CN201210434632XA
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Chinese (zh)
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CN102875003A (en
Inventor
张磊
杨久俊
赵明银
王雪平
杨沛森
赵誉
余海燕
曲烈
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天津城市建设学院
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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
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/60Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
    • 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
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/40Valorisation of by-products of wastewater, sewage or sludge processing

Abstract

The invention discloses an integrated technology of thermal decomposing, dry distilling and gasifying sludge and preparing of ceramsite. By utilizing the method disclosed by the invention to process the sludge in a city, retained heat in the sludge in the city and utilization values of inorganic components can be fully achieved; and moreover, a lightweight heat insulation building material can beobtained while the sludge is processed in a harmless manner; and harmlessness, reduction and resource utilization of the sludge of a sewage plant in the city can be achieved.

Description

A kind of pyrolyzing sludge destructive gasifying and haydite prepare integrated technique
Technical field
The present invention relates to a kind of pyrolyzing sludge destructive gasifying and haydite and prepare integrated technique, belong to field of environment protection.
Background technology
It is reported, China's urban wastewater discharge has reached 5.11 * 10 4Hundred million ton/years, amount of sludge accounts for the 0.3%-0.5% that processes the water yield, and annual quantity discharged is huge.Contain some heavy metals, pathogenic bacteria and toxic organic compound in the municipal sludge, can produce Land pollution, rot, distribute the environmental hazards such as foul smell, polluted underground water; But also be rich in biogenic, organic matter and some inorganic components in the municipal sludge simultaneously, can recycling.The harmlessness disposing of mud and application technology as the second resource are the hot issues of studying both at home and abroad always.
Both at home and abroad, the treatment process of municipal sludge mainly contains landfill, agricultural compost, fills out sea and thermochemical treatment etc. at present.Landfill is that mud is treated as a kind of refuse, and its treatment process mainly is conceived to how to eliminate harm and reduces volume, because the increase of the in short supply and environmental stress of land resources reduces or the use that is under an embargo gradually; Because contain the compositions such as nitrogen and phosphorus in the mud, agricultural sludge comes into one's own and is applied in many countries, but the potentially dangerous that exists the heavy metal in the mud that soil and crop are polluted.The heat treating method of mud mainly is to burn, but will consider that also potential De dioxin pollutes.
Summary of the invention
The present situation that lacks effective comprehensive utilization technique for present China sludge disposal field, the applicant has developed a kind of harmlessness disposing and comprehensive utilization of resources technology of municipal sludge, this technology can utilize the organic constituent in the mud to generate inflammable gas, can utilize again inorganic component wherein to be sintered into haydite, have the characteristics such as the comprehensive utilization of mud amount is large, technique is simple.
The purpose of this invention is to provide a kind of municipal sludge pyrogenation and carbonization gasification and prepare integrated technique with haydite, comprise step:
1) with municipal sludge through filter-press dehydration to water ratio 50-60%, obtain dewatered sludge;
2) by following quality than feeding: dewatered sludge 55-90%, coal dust 5-20%, cement 2-10%, flyash 0-14% (or colliery powder), vegetable fibre 1-3%; And after fully mixing it evenly, adopt the mode of extruding that compound is prepared into the mud pellet that particle diameter is 10-20mm;
3) the mud pellet is sent into dry kiln and dried to water ratio 8-12%, bake out temperature is 150-180 ℃;
4) step 3) gained mud pellet is delivered to pyrogenation and carbonization vapourizing furnace internal reaction; Be divided into dryer section, retort section, gasification section and four zones of burning zone in the pyrogenation and carbonization vapourizing furnace; The mud pellet at first enters 80-180 ℃ of dryer section, deviates from residual water-content; To 180-600 ℃ of retort section, destructive distillation goes out the alkanes combustible gas C of generation again mH n, reclaim for subsequent use; Afterwards to 600-1100 ℃ of gasification section, in this stage, at first make the organic carbonization in the pellet produce carbide, afterwards partially carbonized thing burning and contact generation H with water vapor when 1100 ℃ of left and right sides 2With CO, reclaim for subsequent use; Last mud pellet enters 1150-1200 ℃ of calcining section, obtains light high-strength haydite through high-temperature calcination;
In dryer section, retort section and the gasification section of pyrogenation and carbonization vapourizing furnace, keep air coefficient 0.6-0.8; In the calcining section of pyrogenation and carbonization vapourizing furnace, the maintenance air coefficient is 1.05-1.2.
For better effect is arranged, preferred, step 2) by following quality than feeding: dewatered sludge: coal dust: cement: flyash: vegetable fibre=68%:14%:6%:10%:2%; Or dewatered sludge: coal dust: cement: flyash: vegetable fibre=62%:16%:8%:11%:3%; Or dewatered sludge: coal dust: cement: flyash: vegetable fibre=56%:20%:10%:12%:2%; Or dewatered sludge: coal dust: cement: flyash: vegetable fibre=80%:9%:4%:6%:1%; Or dewatered sludge: coal dust: cement: flyash: vegetable fibre=88%:6%:2%:3%:1%.
At the inflammable gas of destructive distillation, gasifying stage generation, such as C mH n, H 2With CO etc., reclaim the secondary fuel that can be used as when implementing present technique and recycle through purifying, the fuel when also can be used as the various material of construction of sintering uses, such as the sintering of brick etc.;
The light high-strength haydite that calcining obtains can be used as the starting material of concrete segment, haydite concrete; And the waste heat of light high-strength haydite when cooling also can be used as the heat of mud pellet when dry kiln is dried.
The features and advantages of the invention:
1. the technology of the present invention has realized innoxious, minimizing and the recycling of municipal sewage sludge.Fuel characteristic and the resource characteristics of mud are all used, and when alleviating its environmental hazard at the mud of dissolving in a large number, change harmful to treasure, the inflammable gas of generation can also use as secondary energy, has really realized recycling economy, energy-conserving and environment-protective; The end product haydite can be used as commodity selling and obtains abundant economy return.The inventive method has significant economic benefit, environmental benefit and social benefit.
2. by the inventive method lignin-sludge, can obtain inflammable gas and end product light ceramic; The Heavy Metals in Sludge ion is cemented in haydite inside simultaneously, has avoided the problem of its secondary diffusion.
3. the inventive method has fully realized calorific value in the mud and the utility value of inorganic component, obtains a kind of light heat insulation building material in harmless treatment mud.
4. although present method belongs to thermal treatment, these processing condition are that the applicant obtains behind great many of experiments, guarantee to contain the generation of the objectionable impuritiess such as dioxin.
Description of drawings
Fig. 1. process flow diagram of the present invention
Wherein: 1: plate type pressure filter; 2,10,14: lift; 3: the dewatered sludge warehouse; 4: pulverized coal warehouse; 5: cement storage bin; 6: flyash (or colliery powder) warehouse; 7: the fiber warehouse; 8: homogenizing bin; 9: stirrer; 11: extrusion ball forming machine; 12: rotary conveyor; 13: dry kiln; 15: the pyrogenation and carbonization vapourizing furnace; 16,17,19: air shooter; 18: water seal; 20: the tunnel furnace of baking bricks; 21: haydite cooling storehouse; 22: the haydite discharge tube
Fig. 2 mud pellet pyrogenation and carbonization gasification installation structure iron
Wherein: 15-pyrogenation and carbonization gasification body of heater; The 18-water seal; 21-grain warehouse; 22-haydite discharge tube; The 23-opening for feed; 24,26,27, the 30-point for measuring temperature, be used for measuring the temperature in the stove; 25,28-high-temperature blower; The 29-tornado dust collector; 31-disc type unloading machine; The 32-induced draft fan
Embodiment
In order to understand better the present invention, the present invention is further illustrated with embodiment below in conjunction with accompanying drawing, but embodiment does not limit the present invention.
Embodiment 1
Municipal sludge with water ratio 80%~90% water ratio, through plate type pressure filter (1) filter-press dehydration to water ratio 50-60%, according to dewatered sludge: the quality of coal dust: cement: flyash: vegetable fibre=68%:14%:6%:10%:2% is than feeding, and places respectively warehouse (3), (4), (5), (6), (7); Afterwards it is delivered to homogenizing bin (8) and mixes, deliver to again in the stirrer (9) and stir; Then be promoted in the extruding balling-up tablets press (11) by lift (10) the compound extruding is prepared into the mud pellet that particle diameter is 10-20mm.
The mud pellet is sent into dry kiln (13) by transmission belt (12) dry to water ratio 8-12%, the temperature 150-180 of oven dry ℃; Dried mud pellet is transported to pyrogenation and carbonization vapourizing furnace (15) internal reaction by lift (14) again.
The inside of pyrogenation and carbonization vapourizing furnace (15) can be divided into dryer section, retort section, gasification section and four zones of burning zone, as shown in Figure 2.The mud pellet at first enters in the stove from opening for feed (23), in 80-180 ℃ of dryer section (A), deviates from residual water-content; In 180-600 ℃ of retort section (B), the alkanes combustible gas C that destructive distillation produces mH nIn 600-1100 ℃ of gasification section (C), at first carbide is produced in carbonization, and afterwards at 1100 ℃ of high-temperature areas, partially carbonized thing burns and contacts with water vapor, produces H 2With CO; Last mud pellet enters 1150-1200 ℃ of calcining section (D) and obtains light high-strength haydite through high-temperature calcination, and haydite enters haydite cooling storehouse (21) through discharge tube (22).
In dryer section, retort section and the gasification section of pyrogenation and carbonization vapourizing furnace, keep air coefficient 0.6-0.8; In the calcining section, the maintenance air coefficient is 1.05-1.2, and relies on gas blower (32) capacity oxygen gas-supplying, makes the organic perfect combustion in the pellet.
Inflammable gas (C in the retort section generation mH nDeng) introduce tar removing and foreign gas in the water seal (18) through epimere high-temperature blower (25); Inflammable gas H in the gasification section generation 2With CO etc., introduce dedusting in the tornado dust collector (29) through hypomere high-temperature blower (28), and then enter water seal (18) tar removing and foreign gas.
The light high-strength haydite that obtains after the calcining is used for the starting material of concrete segment, haydite concrete.The waste heat of light high-strength haydite when cooling is used for the origin of heat of mud pellet when dry kiln is dried.
The inflammable gas that produces in the pyrogenation and carbonization vapourizing furnace can be delivered to the interior fuel as vitrified brick of vitrified brick calcining kiln (20) by pipeline (19) after water seal (18) purifying treatment; Can also recycle as the fuel gas of other purposes.
Embodiment 2
With the municipal sludge of water ratio 80%~90% water ratio, through the pressure filter filter-press dehydration to water ratio 50-60%, according to dewatered sludge: the quality of coal dust: cement: flyash: vegetable fibre=80%:9%:4%:6%:1% compares feeding.
All the other obtain light high-strength haydite and reclaim obtaining inflammable gas C according to embodiment 1 operation mH n, H 2With CO etc.; Waste heat during the haydite cooling is as the heat of mud pellet when dry kiln is dried.
Embodiment 3
With the municipal sludge of water ratio 80%~90% water ratio, through the pressure filter filter-press dehydration to water ratio 50-60%, according to dewatered sludge: the quality of coal dust: cement: flyash: vegetable fibre=88%:6%:2%:3%:1% compares feeding.
All the other obtain light high-strength haydite and reclaim obtaining inflammable gas C according to embodiment 1 operation mH n, H 2With CO etc.; Waste heat during the haydite cooling is as the heat of mud pellet when dry kiln is dried.
Embodiment 4
With the municipal sludge of water ratio 80%~90% water ratio, through the pressure filter filter-press dehydration to water ratio 50-60%, according to dewatered sludge: the quality of coal dust: cement: flyash: vegetable fibre=62%:16%:8%:11%:3% compares feeding.
All the other obtain light high-strength haydite and reclaim obtaining inflammable gas C according to embodiment 1 operation mH n, H 2With CO etc.; Waste heat during the haydite cooling is as the heat of mud pellet when dry kiln is dried.
Embodiment 5
With the municipal sludge of water ratio 80%~90% water ratio, through the pressure filter filter-press dehydration to water ratio 50-60%, according to dewatered sludge: the quality of coal dust: cement: flyash: vegetable fibre=56%:20%:10%:12%:2% compares feeding.
All the other obtain light high-strength haydite and reclaim obtaining inflammable gas C according to embodiment 1 operation mH n, H 2With CO etc.; Waste heat during the haydite cooling is as the heat of mud pellet when dry kiln is dried.

Claims (6)

1. a municipal sludge pyrogenation and carbonization gasification prepares integral method with haydite, it is characterized in that comprising step:
1) with municipal sludge through filter-press dehydration to water ratio 50-60%, obtain dewatered sludge;
2) by following quality than feeding: dewatered sludge 55-90%, coal dust 5-20%, cement 2-10%, flyash or colliery powder 0-14%, vegetable fibre 1-3%; And after fully mixing it evenly, in the pressure mode compound is prepared into particle diameter as the mud pellet of 10-20mm;
3) the mud pellet is sent into dry kiln and dried to water ratio 8-12%, bake out temperature is 150-180 ℃;
4) step 3) gained mud pellet is delivered to pyrogenation and carbonization vapourizing furnace internal reaction; Be divided into dryer section, retort section, gasification section and four zones of calcining section in the pyrogenation and carbonization vapourizing furnace; The mud pellet at first enters 80-180 ℃ of dryer section, deviates from residual water-content; To 180-600 ℃ of retort section, destructive distillation goes out the alkanes combustible gas C of generation again mH n, reclaim for subsequent use; Afterwards to 600-1100 ℃ of gasification section, at first make organic carbonization in the pellet in this stage, produce carbide, afterwards at 1100 ℃, partially carbonized thing burning also contact generation H with water vapor 2With CO, reclaim H 2For subsequent use with CO; Last mud pellet enters 1150-1200 ℃ of calcining section, obtains light high-strength haydite through high-temperature calcination;
In dryer section, retort section and the gasification section of pyrogenation and carbonization vapourizing furnace, keep air coefficient 0.6-0.8; In the calcining section of pyrogenation and carbonization vapourizing furnace, the maintenance air coefficient is 1.05-1.2.
2. a kind of municipal sludge pyrogenation and carbonization gasification according to claim 1 prepares integral method with haydite, and it is characterized in that according to dewatered sludge: the quality of coal dust: cement: flyash: vegetable fibre=68%:14%:6%:10%:2% compares feeding.
3. a kind of municipal sludge pyrogenation and carbonization gasification according to claim 1 prepares integral method with haydite, and it is characterized in that according to dewatered sludge: the quality of coal dust: cement: flyash: vegetable fibre=80%:9%:4%:6%:1% compares feeding.
4. a kind of municipal sludge pyrogenation and carbonization gasification according to claim 1 prepares integral method with haydite, and it is characterized in that according to dewatered sludge: the quality of coal dust: cement: flyash: vegetable fibre=88%:6%:2%:3%:1% compares feeding.
5. a kind of municipal sludge pyrogenation and carbonization gasification according to claim 1 prepares integral method with haydite, and it is characterized in that according to dewatered sludge: the quality of coal dust: cement: flyash: vegetable fibre=62%:16%:8%:11%:3% compares feeding.
6. a kind of municipal sludge pyrogenation and carbonization gasification according to claim 1 prepares integral method with haydite, and it is characterized in that according to dewatered sludge: the quality of coal dust: cement: flyash: vegetable fibre=56%:20%:10%:12%:2% compares feeding.
CN201210434632XA 2012-11-05 2012-11-05 Integrated technology of thermal decomposing, dry distilling and gasifying sludge and preparing of ceramsite CN102875003B (en)

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CN106927662B (en) * 2017-05-05 2020-05-12 李苏卿 Method for treating domestic sludge and hazardous waste sludge

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CN103304116A (en) * 2013-07-08 2013-09-18 湖南人文科技学院 Sludge gasifying treatment process
CN104311128B (en) * 2014-10-08 2016-04-20 严亮 A kind of porous adsorptive type haydite and preparation method thereof
CN105174994B (en) * 2015-08-31 2016-06-29 宜昌朗天新型建材有限公司 Adopt the method that pottery sand prepares sludge ceramsite with flue dust regeneration
CN105195092A (en) * 2015-10-09 2015-12-30 江南大学 Sludge-based charcoal and preparation method thereof
CN106866169B (en) * 2017-04-17 2018-01-30 辽宁恒宇环保机械设备制造有限公司 A kind of processing system of hazardous waste sludge recycling, method and the haydite produced using the system, method
CN107010808B (en) * 2017-05-05 2020-08-04 李苏卿 Method for treating domestic sludge
CN108794047A (en) * 2018-07-26 2018-11-13 株洲时代新材料科技股份有限公司 Sludge, bed mud and garden garbage mixing gasifying prepare the method and product of haydite
CN109293190B (en) * 2018-11-02 2020-07-24 南华大学 Treatment method of oily sludge
CN110586609A (en) * 2019-08-12 2019-12-20 中原环资科技有限公司 Hazardous waste treatment process with pyrolysis and ceramsite sintering synergistic
CN111687989B (en) * 2020-06-30 2021-03-30 武汉明源碧景环保科技有限公司 Production equipment and production process for coal gangue, phosphogypsum and sludge ceramsite

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JP2002226248A (en) * 2001-01-29 2002-08-14 Noboru Ishibashi Cement mixture containing porous fired body and method for improving strength of cement mixture by addition of the porous fired body
CN100584794C (en) * 2007-12-19 2010-01-27 清华大学 Method for producing porcelain granule light weight aggregate with sewage sludge
CN102503505A (en) * 2011-10-13 2012-06-20 天津生态城环保有限公司 Method for firing sludge into haydite

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Publication number Priority date Publication date Assignee Title
CN106927662B (en) * 2017-05-05 2020-05-12 李苏卿 Method for treating domestic sludge and hazardous waste sludge

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