CN102173553B - Method for drying and processing sludge by use of cement production waste gas - Google Patents

Method for drying and processing sludge by use of cement production waste gas Download PDF

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CN102173553B
CN102173553B CN2011100030770A CN201110003077A CN102173553B CN 102173553 B CN102173553 B CN 102173553B CN 2011100030770 A CN2011100030770 A CN 2011100030770A CN 201110003077 A CN201110003077 A CN 201110003077A CN 102173553 B CN102173553 B CN 102173553B
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mud
cement
sludge
dryer
gas
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CN102173553A (en
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袁文献
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袁文献
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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
    • Y02P40/10Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • 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
    • Y02W10/30Wastewater or sewage treatment systems using renewable energies
    • Y02W10/33Wastewater or sewage treatment systems using renewable energies using wind energy

Abstract

The invention discloses a method for drying and processing sludge by use of cement production waste gas. The method comprises the following steps: leading hot air of a clinker cooling machine into a drying machine, and drying the sludge fed into the drying machine until the water content is about 30%; returning the output gas of the drying machine to the cooling machine to cool the clinker; and delivering the dry sludge with the water content of about 30% to an uptake flue at the tail of a cement kiln or to a decomposing furnace for burning, wherein the burning heat is provided for cement firing, and the ash is used as the cement raw material for forming the clinker. The method makes full use of the waste heat in the cement production process and the high-temperature environment of the cooling machine so as to decompose harmful substances in the sludge; the heat is applied to cement production; the pollution-free and full-utilization treatment of the sludge is realized; the sludge drying and processing cost is lowered; and obvious environmental and economic benefits are obtained.

Description

Utilize the oven dry of manufacture of cement waste gas and method for disposing sludge
Technical field
The present invention relates to sludge treatment and disposal field, be specifically related to a kind of waste gas of manufacture of cement cooling grog that utilizes and dry mud, burn method for disposing sludge with cement kiln then.
Background technology
The high speed development of sewage treatment industry, the improving constantly of municipal sewage treatment ability and wastewater treatment rate, sludge of sewage treatment plants output also increases thereupon.Data is introduced, in by the end of March, 2008,1320 of the municipal wastewater treatment plants that the whole nation puts into effect, processing power 9,725 ten thousand m3/d, 890 of the municipal wastewater treatment plants of building, processing power 3,639 ten thousand m3/d, sludge yield is by 1.5t-butt/ten thousand t-sewage, China's mud annual production reaches 5,320,000 tons (butts), and wet sludge quantity is 2,662 ten thousand t (moisture 80%).2010, annual national sludge yield will reach 5,700,000 tons (butts), and wet mud is 2,850 ten thousand t(moisture 80%).The wet mud annual production of China is with 3,000 ten thousand tons of very fast breakthroughs; " the 12 " end of term more will be broken through 4,600 ten thousand tons.
According to investigations, most of sludge of sewage treatment plants is just through namely carrying out unordered storing up or simple landfill after the simple process, the actual treatment disposal rate of current mud even less than 30%.Innoxious subsequent disposal dispose less than 10%, great majority are properly disposed, this will have a strong impact on China and build the effect that the municipal sewage plant cuts down water pollutant.The mud generation sharply increases, and the germ in the mud, foul smell, heavy metal etc. repeatedly cause public event to the pollution of environment, become important environmental problem.Throwing in to the ocean of one of traditional sludge processing mode is under an embargo; Stacking makes mud be piled into the mountain, becomes historical burden, will thoroughly be eliminated; Landfill then exists and takes up an area of many, problems such as utilization ratio is low, percolate polluted underground water and aftertreatment expense; Being used for fertilizer then is greatly limited owing to objectionable impuritiess such as containing heavy metal.How handling, make good use of the mud of enormous amount well, turn harm into good, is the problem of various countries environmentalist research.
Mud after sewage work's dehydration contains moisture about 80%, and solid matter contains certain heat by inorganics and organism.Studies show that reduce sludge water content and be and handle and the most important condition of disposing sludge, the mud after the oven dry is convenient to deposit and transport, and can be used as fertilizer, raw material and fuel, make wherein that useful matter is utilized, so that ultimate disposal mud.Moisture 80% sewage plant sludge, about 1000kJ/kg ~ the 2000kJ/kg of Lower heat value, moisture 50% mud is arrived in oven dry, about 6000kJ/kg ~ the 9000kJ/kg of Lower heat value, moisture 30% mud is arrived in oven dry, about 9000kJ/kg ~ the 13000kJ/kg of Lower heat value, its volume is less than 30% of former moisture 80% sludge volume.Oven dry is to reduce sludge water content, reduce volume, improve the effective measure of calorific value.Utilize the heat oven dry mud of fuel combustion to use resource on the one hand, increased cost, the discharging of fuel combustion has increased the weight of environmental pressure on the other hand.People actively seek to utilize the way of waste heat oven dry mud, the grog of high temperature sintering in the cement production process, produce the hot blast that contains heat in a large number through the cooler cooling, the thermal source that can be used as oven dry mud is dried mud, then the mud after the oven dry is further disposed.The Chinese invention patent patent No. 200610044531.6 has proposed " with the direct method for disposing sludge of high temperature chamotte in the cement production process ", this method is directly carried mud and is added high temperature chamotte to and incline and district or cooling machine, this method is difficult to make wet mud more evenly to mix with high temperature chamotte, heat exchange is poor, treatment capacity is low, importantly high temperature chamotte inclines the district or the cooling machine is cooling stages in manufacture of cement, after wet mud is put into, beginning can be played cooling effect, thereafter by the then burning of high temperature chamotte oven dry back, it is unfavorable that its a pair of grog continues cooling, the heat of its two mud not only is not used, hinder grog on the contrary and continue cooling, improved spent air temperture, made off gas treatment increase difficulty, it is inhomogeneous that its three mud lime-ash is sneaked into cement clinker, can not react with grog at cooling stages generates the material be of value to quality product, influences cement quality.The Chinese invention patent patent No. 01103143.3 has proposed " handling the method for industry and domestic sludge ", and there is the defective that often needs to replenish certain fuel in service in this method.Also having the people that the cooler hot blast is introduced dryer dries mud, because drying course temperature lower (<400 ℃), the temperature of exhaust is below 100 ℃, if only after the dedusting to airborne release, obnoxious flavour in the drying course in the mud (foul smell etc.) is not only eliminated, also can increase, interior stink is dense in a big way to make periphery, forms new pollution; If remove the organic gass such as foul smell in the exhaust, its processing costs is very high, is difficult to operation economically.
Summary of the invention
The objective of the invention is to provide a kind of hot blast that contains heat of being discharged by cooler for the cooling cement clinker in the manufacture of cement that utilizes, do not need postcombustion, can decompose obnoxious flavour in the mud, can utilize the mud heat, and not influence sludge treatment and the method for disposal of cement clinker quality.
The oven dry of manufacture of cement waste gas and the method for disposing sludge utilized of the present invention, be summarised as simply: the chamotte cooler hot blast is introduced dryer to the mud oven dry of feeding dryer, go out dryer gas and return cooler cooling grog, oven dry is sent into cement kiln end or decomposing furnace burning to the dewatered sludge of certain moisture, the heat that burns offers cement and burns till, lime-ash forms grog as cement raw material, thereby does not need postcombustion, reaches pollution-free, the complete utilization of mud are disposed.
Utilize the oven dry of manufacture of cement waste gas and method for disposing sludge, use in the technology of grate cooler as chamotte cooler in the cement produced with the dry method production technology, may further comprise the steps:
1) extracts (350 ± 100) ℃ hot gas from the cement kiln head chamotte cooler, directly or through simple dedusting send in the dryer, be used for oven dry mud;
2) ship moisture 80% wet mud from sewage work and put into wet mud bank and store for future use, the gas that wet mud bank produces is introduced the high temperature section of chamotte cooler;
3) amount that is the mud in the wet mud warehousing 80% mud by 0.08 ~ 0.12 ton of moisture content of 1 ton of cement clinker adding of production is sent into dryer equably, in dryer, the hot gas that wet mud and chamotte cooler extract carries out heat exchange, moisture is evaporated in the mud, controlling out dryer dewatered sludge moisture content is (30 ± 10%), go out dryer gas returns chamotte cooler after dedusting high temperature section, be used for the cooling grog;
4) mud that goes out dryer being sent into the dewatered sludge bank stores, evenly sending into cement kiln end by 1 ton of cement clinker adding of production (0.02 ± 0.01) ton moisture content for the amount of (30 ± 10%) mud then burns, or directly send into cement kiln end and burn, keep the material balance of mud oven dry and sludge incineration, cement kiln end mud pan feeding point can be kiln tail increase in pipeline or decomposing furnace;
5) mud is burned after entering kiln tail increase in pipeline or decomposing furnace, and the heat water supply mud of generation burns till usefulness, and lime-ash is sneaked in the cement raw material, generates cement clinker, and cement kiln waste gas enters atmosphere through dedusting with after purifying.
Moisture 80% wet mud is used in dryer earlier from (350 ± 100) ℃ hot gas of chamotte cooler extraction and is dried the dewatered sludge that sludge water content content is (30 ± 10%), and then sends into cement kiln end and burn.
Go out dryer gas returns chamotte cooler after dedusting high temperature section, be used for the cooling grog.
The gas that wet mud bank produces is introduced the high temperature section of chamotte cooler.
The amount that mud in the wet mud warehousing is 80% mud by 0.08 ~ 0.12 ton of moisture content of 1 ton of cement clinker adding of production is sent into dryer equably.
Evenly sending into cement kiln end by 1 ton of cement clinker adding of production (0.02 ± 0.01) ton moisture content for the amount of (30 ± 10%) mud burns.
The heat water supply mud that mud produces burns till usefulness, and lime-ash is sneaked in the cement raw material, generates cement clinker.
As chamotte cooler, as cooling gas, a gas part that enters behind the grate cooler cooling grog is gone into kiln as secondary air to new dry cement production technology, is used for kiln hood and partly uses the burning of coal air with natural air for it with grate cooler; A part is gone into decomposing furnace as tertiary air, is used for kiln tail decomposing furnace and partly uses the burning of coal air; A part is used for drying material or the hot gas of using coal is burnt till in oven dry; The part cement mill also is used for the oven dry blended material; What atmosphere was polluted is the part that is not utilized, and often is also referred to as the cooler lingering remnants of past customs or cooling machine waste gas.Usually, the Lower heat value that cement clinker burns till with coal is 22000kJ/kg, and coefficient of excess air was got 1.15 o'clock, and the 1kg coal combustion needs combustion air 6.672 Nm 3, heat consumption of clinker is got 3300kJ/kg, produces 1kg grog coal 0.15kg, needs combustion air 1.0 Nm 3, distribute with 6:4 with coal by decomposing furnace and kiln hood, one time wind accounts for 10% of combustion air total amount.So, producing 1kg grog secondary air flow is 0.36 Nm 3, tertiary air is 0.54 Nm 3The clinker temperature that comes out to enter cooler from new type dry kiln is 1360 ℃~1450 ℃, can be by 1400 ℃ of calculating; Be cooled to 65 ℃+envrionment temperature, can be by 100 ℃ of calculating, these thermal exchange are given natural air, the secondary air temperature can reach 900 ℃~1050 ℃, the tertiary air temperature can reach 800 ℃~1000 ℃, and the gas temperature of oven dry material is about about 450 ℃, and lingering remnants of past customs temperature is about about 250 ℃.The lingering remnants of past customs (exhausted air quantity) that cooler cooling 1kg grog is discharged is relevant with multiple factor, and the production statistic data shows that the exhausted air quantity that cooler cooling 1kg grog is discharged is generally at 1.0~2.5Nm 3In/kg grog the scope, i.e. one ton of grog of every cooling produces waste gas 1000~2500 Nm 3If the cooler hot blast can further take full advantage of, the waste gas of discharge can continue to reduce.Patent of the present invention will extract the thermal source that (350 ± 100) ℃ hot gas is dried as mud in the cooler, and the waste gas of cooler discharge can reduce more than 50% in this case.
To the drying sludge characteristic research as can be known, in the mud oven dry, along with the reduction of water ratio, the heated drying characteristic of mud is become better and better, and following table is listed the relation of moisture percentage in sewage sludge and sludge character variation.By table as seen, after the mud drying was handled, proterties improved, and utility value improves, for subsequent processes has been created good condition.But the mummification of hyperthermia drying mud accelerate sludge and raising heat utilization efficiency, but bake out temperature too high (>500 ℃) or go out the dryer material moisture very little, to make combustiblecomponents loss in the mud, even producing sludge incineration even blast, Cheng dioxin highly toxic substance and operating temperature with He closely related in the effusion of objectionable impurities in the mud.Be loss and the assurance operating safety that reduces useful component in the mud drying course, it is (30 ± 10%) that patent of the present invention is controlled out dryer dewatered sludge moisture content, go out dryer gas returns chamotte cooler after dedusting comparatively high temps section, use in the dryer gas objectionable impurities and at high temperature decompose deodorizing and detoxifcation.
Water ratio (%) 90 75 50 10
Calorific value (MJ/kg) - 2~3 6~9 13~17
Plant nutrient (%) 0.5 1.25 2.5 4.5
Flow characteristics Pulpous state Lotion Elastic granule Brittle particle
The temperature of cement kiln end and decomposing furnace is more than 900 ℃, here cement slurry decomposites a large amount of alkaline matter CaO, after mud after the oven dry adds wherein, combustiblesubstance burns rapidly, the sour gas that generates is absorbed by alkaline matter, enters atmosphere with cement kiln gas after the kiln tail gas treatment system purifies then; Lime-ash after the sludge incineration enters rotary kiln with the cement slurry that cement decomposes, and sinters cement clinker under 1450 ℃ high temperature, at this moment, comprises dioxin in the mud and is destroyed in all interior objectionable constituent, and heavy metal is wrapped in the lattice of cement clinker.The sludge incineration liberated heat offers cement slurry and is used for the material decomposition, and the heat that is provided to cement kiln by coal is provided.Like this, mud is by harmless treatment, and its material and heat obtain complete utilization.
Method of the present invention is introduced dryer to cooling cement clinker hot gas from the cement kiln head chamotte cooler dries mud, avoided mud directly to be added on the cement clinker the influence of cement clinker quality and the loss of mud heat, dewatered sludge after the oven dry is sent into the kiln tail to be burned, because dewatered sludge moisture is few, the calorific value height is easy to carry and even feeding, needn't postcombustion, firing system is not had influence yet, and the heat that burning produces also obtains utilizing; In addition, the gas of wet mud bank is introduced the high temperature section of cement kiln head cooler, and the objectionable impurities in the gas is by the pyrolytic decomposition more than 1000 ℃.The major defect that this method has overcome present mud oven dry and disposed, taken full advantage of the hot environment of cement production process waste heat and cement kiln and chamotte cooler, make harmful substance decomposition in the mud, its heat is used for manufacture of cement, reduce mud oven dry and cost of disposal, had tangible environment and economic benefit.
Description of drawings
Fig. 1 utilizes the oven dry of manufacture of cement waste gas and method for disposing sludge schema.
Embodiment
Be described further in conjunction with the embodiments of the present invention of Fig. 1.The oven dry of manufacture of cement waste gas and the method for disposing sludge utilized of the present invention, cement producing line is the above new type nonaqueous cement production line of 2000t/d.Present embodiment adopts the 2500t/d new type nonaqueous cement production line, extracts 350 ℃ of hot gass from the cement kiln head cooler, through whirlwind tube or settling pocket dedusting, sends in the dryer, is used for oven dry mud; Ship moisture 80% wet mud from sewage work and put into storage vault and store, standby, the gas of wet mud storage vault is introduced the high temperature section of cement kiln head cooler, and the objectionable impurities in the gas is by the pyrolytic decomposition more than 1000 ℃; Mud in the storage vault is sent into dryer by handling equipment and feeding equipment, feed quantity is 10t/h, in dryer, mud carries out heat exchange with the hot gas that extracts from the cement kiln end cooler, moisture is evaporated in the mud, going out dryer dewatered sludge moisture content is 30%, dust in the hot gas that cooler extracts is alkaline matter, can absorb sour gas in the mud, thereby suppress obnoxious flavour generation in the drying course mud, go out dryer gas through dedusting and send into the high temperature section of cooler after purifying as the gas of cooling grog, the objectionable impurities in the gas is by the pyrolytic decomposition more than 1000 ℃, and the remaining hot gas of cooler enters atmosphere after purifying; The mud that goes out dryer sent into send into cement kiln end after bank stores and burn or directly send into cement kiln end and burn, add-on is that 30% mud calculates by producing 0.03 ton of moisture content of 1 ton of cement clinker adding, and cement kiln end mud pan feeding point can be kiln tail increase in pipeline or decomposing furnace; The temperature of cement kiln end and decomposing furnace is more than 900 ℃, here cement slurry decomposites a large amount of alkaline matter CaO, after mud after the oven dry adds wherein, combustiblesubstance burns rapidly, the sour gas that generates is absorbed by alkaline matter, enters atmosphere with cement kiln gas after the kiln tail gas treatment system purifies then; Lime-ash after the sludge incineration enters rotary kiln with the cement slurry that cement decomposes, and sinters cement clinker under 1450 ℃ high temperature, at this moment, comprises dioxin in the mud and is destroyed in all interior objectionable constituent, and heavy metal is wrapped in the lattice of cement clinker.Calculate according to adding the cement kiln end sludge quantity, the quality that lime-ash accounts for cement clinker is about 1%, passes through high-temperature calcination again, can not produce adverse influence to cement clinker quality.If it is not bigger that the cement clinker composition of sludge ash dreg chemistry composition and setting produces, can solve by adjusting the cement slurry proportioning.The sludge incineration liberated heat offers cement slurry and is used for the material decomposition, and present embodiment mud produces heat and is about the 300kJ/kg grog, and the heat that is provided to cement kiln by coal has been provided, and saves and burns till with fuel about about 9%.Like this, mud is by harmless treatment, and its material and heat obtain complete utilization, and environment and economic benefit are very remarkable.

Claims (6)

1. utilize the oven dry of manufacture of cement waste gas and method for disposing sludge, use in the technology of grate cooler as chamotte cooler in the cement produced with the dry method production technology, it is characterized in that: the chamotte cooler hot blast is introduced dryer to the mud oven dry of feeding dryer, go out dryer gas and return cooler cooling grog, oven dry is sent into cement kiln end or decomposing furnace burning to the dewatered sludge of certain moisture, the heat that burns offers cement and burns till, and lime-ash forms grog as cement raw material; Specifically may further comprise the steps:
1) extracts 350 ± 100 ℃ of hot gass from the cement kiln head chamotte cooler, directly or through simple dedusting send in the dryer, be used for oven dry mud;
2) ship moisture 80% wet mud from sewage work and put into wet mud bank and store for future use, the gas that wet mud bank produces is introduced the high temperature section of chamotte cooler;
3) amount that is the mud in the wet mud bank 80% mud by 0.08 ~ 0.12 ton of moisture content of 1 ton of cement clinker adding of production is sent into dryer equably, in dryer, the hot gas that wet mud and chamotte cooler extract carries out heat exchange, moisture is evaporated in the mud, controlling out dryer dewatered sludge moisture content is 30 ± 10%, go out dryer gas returns chamotte cooler after dedusting high temperature section, be used for the cooling grog;
4) mud that goes out dryer being sent into the dewatered sludge bank stores, the amount that is 30 ± 10% mud by 0.02 ± 0.01 ton of moisture content of 1 ton of cement clinker adding of production is evenly sent into the cement kiln end burning then, or directly send into cement kiln end and burn, keep the material balance of mud oven dry and sludge incineration, cement kiln end mud pan feeding point is kiln tail increase in pipeline or decomposing furnace;
5) mud is burned after entering kiln tail increase in pipeline or decomposing furnace, and the heat water supply mud of generation burns till usefulness, and lime-ash is sneaked in the cement raw material, generates cement clinker, and cement kiln waste gas enters atmosphere through dedusting with after purifying.
2. the manufacture of cement waste gas that utilizes according to claim 1 is dried and method for disposing sludge, it is characterized in that it is 30 ± 10% dewatered sludge that moisture 80% wet mud uses earlier 350 ± 100 ℃ of hot gass that extract from chamotte cooler to dry sludge water content content in dryer, and then send into cement kiln end and burn.
3. the oven dry of manufacture of cement waste gas and the method for disposing sludge utilized according to claim 1 is characterized in that dryer gas returns the high temperature section of chamotte cooler after dedusting, is used for the cooling grog.
4. the manufacture of cement waste gas that utilizes according to claim 1 is dried and method for disposing sludge, it is characterized in that the high temperature section of the gas introducing chamotte cooler that wet mud bank produces.
5. manufacture of cement waste gas oven dry and the method for disposing sludge utilized according to claim 1 is characterized in that the mud in the wet mud bank is sent into dryer equably by producing 1 ton of cement clinker amount that to add 0.08 ~ 0.12 ton of moisture content be 80% mud.
6. the oven dry of manufacture of cement waste gas and the method for disposing sludge utilized according to claim 1 is characterized in that evenly sending into cement kiln end by the amount that 0.02 ± 0.01 ton of moisture content of 1 ton of cement clinker adding of production is 30 ± 10% mud burns.
CN2011100030770A 2011-01-07 2011-01-07 Method for drying and processing sludge by use of cement production waste gas Expired - Fee Related CN102173553B (en)

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CN104230190A (en) * 2014-09-18 2014-12-24 环境保护部华南环境科学研究所 Method for treating arsenical sludge by utilizing rotary cement kiln
CN104315523A (en) * 2014-11-07 2015-01-28 西安建筑科技大学 Method for drying and burning sludge via cement plant kiln tail system
CN106186747A (en) * 2016-06-30 2016-12-07 浙江新业管桩有限公司 A kind of method utilizing printing and dyeing sludge to prepare high strength clinker
CN106186746A (en) * 2016-06-30 2016-12-07 浙江新业管桩有限公司 A kind of method utilizing printing and dyeing sludge to prepare clinker

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