CN105602586A - System for urban sludge flue gas drying middle-temperature pyrolysis carbonization - Google Patents
System for urban sludge flue gas drying middle-temperature pyrolysis carbonization Download PDFInfo
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- CN105602586A CN105602586A CN201610126999.3A CN201610126999A CN105602586A CN 105602586 A CN105602586 A CN 105602586A CN 201610126999 A CN201610126999 A CN 201610126999A CN 105602586 A CN105602586 A CN 105602586A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
- C10B57/10—Drying
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Materials Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a system for urban sludge flue gas drying middle-temperature pyrolysis carboization. The system comprises a hot air device and a feed storage metering device, a low-temperature flue gas drying device, a bag-type dust remover, a middle-temperature pyrolysis carboization device, a flue gas waste heat recovery device and a tail gas purification and deodorization device which are connected in sequence, and the hot air device supplies hot air to the low-temperature flue gas drying device and the middle-temperature pyrolysis carboization device. According to the system for urban sludge flue gas drying middle-temperature pyrolysis carboization, by means of optimal combination of the system and energy gradient utilization, the energy consumption of the system is reduced, and the thermal efficiency is effectively improved; by means of middle-temperature pyrolysis, the problem that coking and blocking are caused by local overheating of the sludge is solved, and the reliability of the system is improved. The system adopts a low-temperature flue gas drying technology and serves as front section sludge drying core equipment, the atomizing drying efficiency is high, and the time is short; a principle of combining the drying section with a spouted bed and a fluidized bed can effectively control the particle size of dried discharging materials to be 2-4 mm, and the subsequent carbonization efficiency is effectively improved.
Description
Technical field
The present invention relates to chemical industry, ecological, environmental protective field, more particularly, relate to a kind of for municipal sludge cigaretteThe system of warm pyrolysis charring in gas mummification.
Background technology
By in by the end of June, 2015, national the planned city, county (hereinafter to be referred as cities and towns, not containing other organic town)Accumulative total is built up 3802 of sewage treatment plants, and sewage treatment capacity reached for 1.61 billion cubic meter/days. Measuring and calculating accordingly,9.66 ten thousand tons/day of sludge yields (moisture content 80%), 3,526 ten thousand tons/year.
Mud is the product after sewage disposal, be a kind of by organic relic, microbial cells, inorganic particle,The extremely complicated heterogeneous body of the composition such as colloid. Urban wastewater treatment firm mud not only water content is high, perishableRotten, there is strong odor, and contain heavy metal and two evils such as a large amount of pathogens, parasitic ovum and chromium, mercuryThe poisonous and harmful of the hard degradations such as English and carcinogen. The unprocessed random stacking of mud, through invading of rainwaterErosion and seepage effect, very easily cause secondary pollution to underground water, soil etc., and directly harm humans is healthy.
Properly, safety, environmental protection, the processing of suiting measures to local conditions dispose municipal sludge, is protection Urban Water EnvironmentBe badly in need of the vital task solving. At present, the processing that Treatment of Sludge disposing technique is mainly city's mud comprise landfill,The approach such as soil utilization, anhydration and incineration and pyrolysis after aerobic compost or anaerobic digestion. But due to China's mudThe developed countries such as the content of organic matter is more American-European are low, and in most of municipal sludge due to receiving portion industryWaste water causes Heavy Metals in Sludge to have exceeding standard in various degree, considers the enrichment of food chain, aerobicThe final disposal problem of soil utilization after compost or anaerobic digestion cannot solve, and landfill is because municipal refuse is filled outThe factor such as uncontrollable of the storage capacity restriction in place and mud secondary pollution of burying is by national industrial policies are limit,Anhydration and incineration is limited to high energy consumption and high operating cost can only be used in flourishing city.
Pyrolyzing sludge is that mud is heated under the state of anaerobic or anoxic, and produces thus heat effect and causeThat chemical breakdown makes it to become is solid-state, the chemical breakdown reaction of gaseous state and liquid. Because pyrolysis is in anoxicUnder condition, carry out its NOx、SOxWith the discharge of the pollutants such as heavy metal well below the row in burning processHigh-volume, can obtain carbide, tar and combustion gas from pyrolysis, they have higher calorific value and value.
The engineering of pyrolyzing sludge application at present concentrates on high temperature pyrolysis charing, causes operating cost because energy consumption is highGao Qi, cannot large-scale promotion. And in middle temperature slow pyrolysis (400～600 DEG C), organic in mudMatter is complete decomposition, has realized organic matter in mud and the stabilization treatment of heavy metal. Warm solution in employingCan effectively reduce energy consumption and operating cost, by the flue gas waste heat recovery that produces in warm solution dry for mudAfter change, be delivered to pyrolysis charring in carbonizing apparatus, pyrolysis gas is fuel as a supplement, and carbide can be used as water placeReason adsorbent is realized recycling, has application value.
The organic solid waste charing application such as current mud concentrate on high temperature carbonization, and its pre-treatment adopts swinging to dry moreDry machine, does not mate with the characteristic of the high viscosity of dewatered sludge, be limited to stir in drying equipment transport resistance large,Mummification heat transfer efficiency is low, cause that whole system energy consumption is high, equipment failure rate high be unfavorable for extensiveThe feature of promoting. Therefore, how mud carbonization system effectively improves the thermal efficiency, reduces operating cost and raisingThe stability of device is the key of current research.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of for the warm solution of municipal sludge flue gas mummificationThe system of charing, made carbide can be used as adsorbent, has very high to COD and heavy metal ionClearance, is a kind of good organic waste water treatment agent, also can be used as auxiliary fuel.
The technical solution adopted for the present invention to solve the technical problems is: structure is a kind of for municipal sludge flue gasThe system of warm pyrolysis charring in mummification, comprises that hot air apparatus stores up metering device, low with the charging being connected successivelyTemperature flue gas desiccation apparatus, sack cleaner, in warm solution carbonizing apparatus, flue gas waste heat recovery apparatus and tail gasDeodourizing device, described hot air apparatus for low-temperature flue gas desiccation apparatus and in warm solution carbonizing apparatus provide heatWind.
In such scheme, described low-temperature flue gas desiccation apparatus comprises drying, and air intake is arranged at described drying bottomRoad, described drying inside is provided with centrifugal spraying dish, and air inlet duct is positioned at the below of atomizing disk, centrifugal mistChange dish is connected with drive motors, and described centrifugal spraying dish top is provided with sewage sludge feed pipe, sewage sludge feed pipe withScrew feeder is connected, and the top of described drying is provided with flue dust outlet;
In such scheme, described in warm solution carbonizing apparatus comprise pay-off, housing and hot blast distributing pipe,Described pay-off is connected with the top of housing, and the top of described housing is provided with preheating and drying district, described preheatingIn dry section, be provided with multiple distribution rake teeths that are crisscross arranged up and down and cloth distribution plate, described cloth distribution plate is solidFix on the inwall of housing, described distribution rake teeth is fixed on rotating shaft, and described rotating shaft is connected with drive unit,Below, described preheating and drying district is provided with pyrolysis reaction region, and the below of described pyrolysis reaction region arranges carbide and separatesPlate, described hot blast distributing pipe is to heat air delivery in preheating and drying district and pyrolysis reaction region.
In such scheme, described charging is stored up metering device and is comprised that mud receives storehouse, some outlet valves and meteringSpiral, municipal sludge adopt sealed transport vehicle or sludge pump be delivered to mud receive regulate in storehouse balanced follow-upDevice flow, receives bottom, storehouse metering screw through mud and measures and be delivered to flue gas desiccation apparatus.
In such scheme, the combustion-supporting gas of hot air apparatus is sent in described flue gas waste heat recovery apparatus preheating.
In such scheme, described flue gas waste heat recovery apparatus adopts fin strengthening cross-ventilation heat exchange structure.
In such scheme, the dewatered sludge in described sack cleaner is warm in sending into by pneumatic transport equipmentSeparate carbonizing apparatus.
In such scheme, described tail gas clean-up odor removal is connected with adsorption tower and chimney.
In such scheme, described in warm solution carbonizing apparatus be connected with carbide packing device.
In such scheme, described in warm solution carbonizing apparatus also comprise gas-solid separator, described housing is provided withExhanst gas outlet, the entrance of described gas-solid separator is connected with described exhanst gas outlet, described gas-solid separator topBe provided with separating flue outlet, bottom is provided with solid outlet, described solid outlet be arranged on the feed back on housingMouth connects.
In such scheme, the card of described centrifugal spraying dish is provided with the section of multiple metal foil, multiple described inSection distributes ringwise.
In such scheme, the bottom of described housing is provided with carbide floss hole, described carbide floss hole belowCooler is set.
Implement the system for municipal sludge flue gas mummification temperature pyrolysis charring of the present invention, have following usefulEffect:
1, the present invention combines by system optimization, utilizes by energy gradient, has both reduced system energy consumption,Effectively raise the thermal efficiency; In warm solution avoided mud hot-spot to produce the problem of coking and obstruction,Improve system reliability.
2, the present invention adopts low-temperature flue gas drying technique as leading portion sludge drying nucleus equipment, atomization mummificationEfficiency is high, and the time is short; Mummification section can effectively be controlled discharging particle diameter after mummification in conjunction with spouted bed and fluid bed principle2～4mm, has effectively improved as follow-up carbonization efficiency.
3, after after flue gas mummification of the present invention, mud adopts pneumatic conveying mode to send into after sack cleaner separatesContinuous carbonizing apparatus, compares traditional helical feed or belt conveying mode, makes full use of after the mummification of this techniqueThe particle size features of mud, had both saved conveying energy consumption, and the air-tightness of whole system is good, operating environment odorless,Flour dust overflow.
4, flue gas heat recovery system of the present invention is compared and is adopted waste heat boiler form, has reduced adapter ringEnergy dissipation and the equipment investment of joint, in conjunction with flue gas drying equipment, system is simple and reliable.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of the present invention for the system of municipal sludge flue gas mummification temperature pyrolysis charringFigure;
Fig. 2 is the structural representation of low-temperature flue gas desiccation apparatus;
The structural representation of Fig. 3 warm solution carbonizing apparatus in being.
Detailed description of the invention
Understand for technical characterictic of the present invention, object and effect being had more clearly, now contrast accompanying drawingDescribe the specific embodiment of the present invention in detail.
As shown in Figure 1-Figure 3, comprise hot air apparatus 10 and the charging being connected successively store up metering device 1,Low-temperature flue gas desiccation apparatus 2, sack cleaner 3, in warm solution carbonizing apparatus 5, flue gas waste heat recovery dressPut 6 and tail gas clean-up odor removal 7.
Charging is stored up metering device 1 and is comprised that mud receives storehouse, some outlet valves and metering screw. Municipal sludgeAdopting sealed transport vehicle or sludge pump to be delivered to charging stores up in metering device 1 mud and receives in storehouse and regulateBalanced follow up device flow, receives bottom, storehouse metering screw through mud and measures and be delivered to flue gas desiccation apparatus2。
Charging store up metering device 1 transport dewatered sludge by dry low-temperature flue gas desiccation apparatus 2 bottoms centrifugalThe effect of atomizer high speed centrifugation is converted into small particle diameter atomization state, mud and carbonizing apparatus 5 waste heat cigarettes after atomizationThe high-temperature flue gas contact that gas and hot air apparatus 10 produce, the caloic exchange of the bigger serface passing through and logicalCross the effect of high speed centrifugation broken wall, the moisture in mud is evaporated and taken out of rapidly. Low-temperature flue gas desiccation apparatus 2Specially for high, the traditional swinging of dewatered sludge viscosity or indirect heat exchange type drying equipment easily glutinous wall,The device that the problem such as stops up, heat exchange efficiency is low and develop, has improved mud with high by high speed centrifugation atomizationThe contact gear ratio surface area of temperature flue gas, heat exchange fully and the time only need 6S, whole desiccation apparatus 2 floor spacesLittle, operating efficiency is high.
After mummification mud be delivered to by Pneumatic conveyer 4 in warm solution carbonizing apparatus 5 interior further dry,In process, warm pyrolytic reaction produces carbide and pyrolysis gas, and carbide is through carbonizing apparatus 5 bottom coohng unitAfter being delivered to 11 packings of carbide packing device after cooling, enter follow-up recycling link, can be used asFuel or water treatment adsorbent. Pyrolysis gas enters in flue gas waste heat recovery apparatus 6 with after air heat-exchange and sendEnter in hot air apparatus 10. Reclaim heat generation high-temperature hot-air through high temperature thermal decomposition and can be used for low-temperature flue gas mummificationDevice 2. In warm solution carbonizing apparatus 5 dry sections adopt multi-stage oven forms to be convenient to control technological temperature, considerMud preheating and dry rear particle diameter attribute, pyrolysis reactor employing fluidized-bed structure increase mud and hot blastReaction contact-making surface, carbonization temperature and time are adjustable, have reduced the technique controlling difficulty of sludge carbonization.
In the tail gas that produces of warm solution carbonizing apparatus 5 enter tail gas clean-up and odor removal 7, through bag-type dustIsolate flue gas and enter tail gas clean-up and odor removal 7, after washing and microbial degradation, enter active carbon and urgeAfter the further processing of change adsorption tower 8 is up to standard, discharge through chimney 9.
Flue gas waste heat recovery apparatus 6 adopts fin strengthening cross-ventilation heat exchange structure, and after preheating, air is sent intoThe combustion-supporting pyrolysis gas of hot air apparatus 10 and auxiliary fuel, compare water cooling mode and realized the gradient profit of energyWith.
As shown in Figure 2, low-temperature flue gas desiccation apparatus 2 comprises drying 201, particle separator 202, cigaretteDirt outlet 203, inspection manhole 204, low-temperature flue gas air inlet 205, ventilation terminal 206, drive motors207, sludge storage bin 208, helical feed motor 209, screw feeder 210, V-baffle 211, fromCore type atomizing disk 212, scraper 213.
Wherein drying 201 dryings are divided into upper and lower two parts, and bottom is provided with air inlet duct. Loose in order to reduceHeat loss, ensures the mummification thermal efficiency, and the barrel of drying 201 adopts insulation material, and lined ceramics orSmooth anti-corrosion material, can effectively prevent the corrosion of equipment, improves service life of equipment. Air inlet duct is by doingDry cylinder lower side is tangentially connected with low-temperature flue gas air inlet 205. Centrifugal spraying dish 212 is at dryingPart bottom on 201, is positioned at air inlet duct top. Air channel and ventilation terminal 6 are positioned at air inlet and centrifugal sprayingBetween dish 212, ensure uniform air intake, make gas-solid contact time long, heat transfer process is abundant. Flue dust outlet203 on drying 201 tops, and inspection manhole 204 is set on drying 201.
Sewage sludge feed pipe is arranged on centrifugal spraying dish 212 tops, is connected with screw feeder 210. SpiralCarry motor 209 to drive screw feeder 210 to rotate. The charging aperture of screw feeder 210 and sludge storage bin208 bottoms are connected. Mud charge door lower end of duct arranges reverse V-shaped baffle plate 211, can prevent semi-oriented mudEnter in centrifugal spraying dish 212 and mix with wet mud, make wet mud evenly enter centrifugal spraying dish 212In, reduce the wet mud entering with speed and directly fall into drying 201 spaces, two ends.
The particle separator 202 of adjustable position is set, to the grain of mud after mummification on drying 201 topsFootpath is selected, and guarantee flue gas is taken the dewatered sludge of appropriate particle size out of drying 201, and particle diameter is largerParticle falls with flue gas and continues to contact mummification under the effect of gravity, ensures that mud is fully dried.
Centrifugal spraying dish 212 is connected with drive motors 207, and drive motors 207 drives its rotation, this realityThe drive motors 207 of executing in example is variable-frequency motor, and its rotating speed is adjustable. Centrifugal spraying dish 212 arranges multipleThe cultrate section of metal foil, is concentric circles with atomizing disk. Mud is by High Rotation Speed (atomization webLinear velocity 90～the 160m/s of edge) centrifugal spraying dish 212, mud granule is first cut apart chopping by section,Then throw away by centrifugal force through the aperture of atomizing disk periphery, at multiple masterpiece centrifugal, that shear, collideWith under to throw away at circumferential edges at a high speed, form droplet, fully contact with low-temperature flue gas stream, due to particleAtomizing effect is good, and mud is instantaneous dry by flue gas.
Further, for fear of mud sticky wall in atomization process, the extension of centrifugal spraying dish 212Multiple scrapers 213 are set. In the time that atomizing disk is worked, can wipe the mud of sticky wall off simultaneously. As excellentChoosing, the dish body of centrifugal spraying dish 212 adopts automatically cleaning high-abrasive material.
Low-temperature flue gas air inlet is connected with air blast, and the waste hot gas of being sent into by air blast is through air channel and cloth windDevice 206 tangentially enters drying 201 from drying 201 lower ends, rises in the shape of a spiral. Wet mud is through spiralFeeder 210 is delivered in drying 201, falls into centrifugal spraying dish 212, part under Action of Gravity FieldWet mud, drive motors 207 drives on the centrifugal spraying dish 212 of high speed rotating and is chopped into littleGrain is thrown out of and atomization from plate edge, when centrifugal spraying dish 212 rotating speeds simultaneously under centrifugal actionWhen higher with feed rate, wet mud feed liquid is atomized into droplet. Like this, two strands of left and right are being carried droplet secretlyHigh speed waste hot gas clash drying 201 is interior, the dry mud of part is through the used heat band of gas upwardsEnter flue dust outlet 203 and discharge and collect, fully dry mud granule in upper end because gas prompt drop is low and heavyFall, continue to contact and be dried with low-temperature flue gas.
As shown in Figure 3, in, warm solution carbonizing apparatus 5 comprises pay-off, housing 518, hot blast distributing pipe512 and gas-solid separator 508.
Pay-off comprises receiving hopper 501 and is arranged on the spiral distributor 502 of receiving hopper 501 lower ends. SendMaterials device is connected with the top of housing 518, and the top of housing 518 is provided with preheating and drying district 510, and establish at middle partThere is pyrolysis reaction region 511. In preheating and drying district 510, be provided with multiple distribution rake teeths 504 that are crisscross arranged up and downWith cloth distribution plate 503, cloth distribution plate 503 is fixed on the inwall of housing 518. Distribute rake teeth 504 solidFix on rotating shaft 505, rotating shaft 505 is connected with drive unit 516, and drive unit 516 is motor,Drive rotating shaft 505 to rotate.
510 belows, preheating and drying district are provided with pyrolysis reaction region 511, and the below of pyrolysis reaction region 511 arranges charcoalCompound separating plate 513, hot blast distributing pipe 512 is to the interior conveying in preheating and drying district 510 and pyrolysis reaction region 511Hot blast. Housing 518 is provided with exhanst gas outlet 506, the entrance of gas-solid separator 508 and exhanst gas outlet 506Connect. Gas-solid separator 508 tops are provided with separating flue outlet 507, and bottom is provided with solid outlet, solidOutlet is connected with the feedback outlet 509 being arranged on housing 518. Separating flue outlet 507 separates with pyrolysis gasPurifier connects, and the bottom of housing 518 is provided with carbide floss hole 514, carbide floss hole 514 timesSide arranges cooler.
The utility model is mainly used in through the direct mummification of high-temperature flue gas to moisture content below 40% or warpHigh mass dryness fraction is dewatered to moisture content 40% city, left and right organic solid waste. Pay-off conveying is come dewatered sludge and is fallenEnter cloth distribution plate 503, through being installed on the rotation that drives sub-material rake teeth 504 on rotating shaft 505, by materialBe evenly distributed on cloth distribution plate 503. Utilize the interior hot blast of hot blast distributing pipe 512 and pyrolysis zone flue gasEffect realizes preheating and drying, and preheating and drying district 510 is made up of multiple chambers, by preheating and drying step by step,Moisture percentage in sewage sludge is reduced to below 10%, and mud granularity is to enter pyrolysis zone after micron order. The temperature of pyrolysis zoneDegree is 400～600 DEG C, and mud is in the lower warm solution of autocatalysis of the heavy metals such as hot blast effect and copper,Form carbide and pyrolysis gas. Wherein to enter cyclonic separation through exhanst gas outlet 506 laggard for pyrolysis gas and flue gasEnter pyrolysis gas isolation of purified unit and recycle as one of hot-air system auxiliary fuel, carbide is through bottomCarbide separating plate 513 enters carbide cooler 515 after entering decanting zone, is delivered to follow-up after coolingCarbide finished product workshop section.
Further, gas-solid separator 508 is drawn together two stage cyclone chamber, for the high-temperature flue gas that pyrolysis is producedIn dust separation out, isolated gas be delivered to a part be delivered to pyrolysis zone low-temperature zone useIn pyrolytic reaction, a part is delivered to flue gas heat recovery system. High-temperature flue gas enters fume afterheatRecycling system is through condensation and separation of moisture and will be delivered to preheating zone after part air preheat, and condensation is cleanAfter changing, high-temperature flue gas is delivered to the direct anhydration system of flue gas as drying medium.
Further, in preheating and drying district 510 and pyrolysis reaction region 511, be provided with temp probe, to reachControl the object that detects pyrolysis temperature. The carbonization reaction time can be passed through the rotational speed regulation of rotating shaft 505.
Further, the bottom of housing 518 is provided with purging motor 517, for purging dust.
The present invention also provides following two specific embodiments:
Embodiment 1:
20 tons of certain Sewage Plant dewatered sludge (moisture content 80%) output every day, adopt high solid content delivery pump defeatedEnter charging and store up and metering system 1, enter low-temperature flue gas anhydration system 2 and carry out mummification, moisture content is reduced to30～40%, decrement is 5.71～6.67 tons. After mummification, mud is sent into middle temperature pyrolytic carbon through pneumatic transport equipment 4Change system 5, pyrolysis reaction temperature is 650～800 DEG C, produces 2.42 tons of carbides and pyrolysis through pyrolytic reactionGas, drop temperature is that the carbide of 150～200 DEG C is sent into follow-up money after water-cooled unit cools to below 30 DEG CSource utilizes link, and 600～750 DEG C of pyrolysis gas are condensed to 400 DEG C through flue gas waste heat recovery system rapid coolingBelow after, send into flue gas anhydration system by dewatered sludge mummification to moisture content 30～40%.
In this technique in flue gas anhydration system tail gas through alkali lye spray-absorption, microbial degradation, activated carbon catalysisAbsorption wait tail gas clean-up machine deodoration system process up to standard after by smoke stack emission. Pyrolysis gas is after rapid cooling condensationSend in hot-air system and thoroughly burn and reclaim heat for flue gas anhydration system through 900～1100 DEG C.
This process using waste heat preheating heat wind furnace combustion air, has realized the gradient utilization of energy, compares employingWaste heat boiler steam mode processed has reduced the energy dissipation of intermediate link, and flue gas anhydration system adopts high speed centrifugationIt is low that conventional helical agitating mode operation troubles rate is compared in atomization, whole technique power consumption 45～55Kw/ ton mud that wets(moisture content 80%), gas consumption 50～60Nm3The wet mud of the wet mud of/ton or coal consumption 40～50kg/ ton. PhaseThan the wet mud of high temperature carbonization power consumption 75～80Kw/ ton, gas consumption 70～75Nm3The wet mud of/ton or coal consumption57～62kg/ ton mud that wets, direct operating cost lowers 15～20%. Compare anhydration and incineration technique power consumption 90～The 120Kw/ ton mud that wets, coal consumption 70～80kg/ ton mud that wets, direct operating cost reduces more than 30%.
This process system floor space 700 ㎡, can utilize idle land used in Sewage Plant to arrange, have reduced biographySystem mud centrally disposes the cost of transportation of mode, has both been applicable in Sewage Plant factory, disperseing to dispose on a small scale, also suitableReduce Treatment of Sludge disposal unit in large-and-medium size cities Sewage Plant. In the present embodiment, test data is as table 1, table 2Shown in.
This process stream of table .1. changes
This technique of table .2. and similar process energy consumption level contrast
Embodiment 2:
20 tons of certain Sewage Plant dewatered sludge (moisture content 80%) output every day contain after high mass dryness fraction dehydrationWater rate is reduced to 40%, and decrement is 6.67 tons. Adopt high solid content delivery pump input charging to store up and countAmount system 1, enters low-temperature flue gas anhydration system 2 and carries out mummification, and moisture content is reduced to 20～30%,Decrement is 5.0～5.71 tons. Mud warm solution carbonization system in pneumatic transport equipment 4 is sent into after mummification5, pyrolysis reaction temperature is 650～800 DEG C, produces 2.42 tons of carbides and pyrolysis gas through pyrolytic reaction,Drop temperature is that the carbide of 150～200 DEG C is sent into follow-up after water-cooled unit cools to below 30 DEG CRecycling link, 600～750 DEG C of pyrolysis gas are condensed to through flue gas waste heat recovery system rapid cooling400 DEG C send into after following flue gas anhydration system by dewatered sludge mummification to moisture content 30～40%.
In this technique in flue gas anhydration system tail gas through alkali lye spray-absorption, microbial degradation, active carbonThe tail gas clean-up machine deodoration system such as catalytic adsorption process up to standard after by smoke stack emission. Pyrolysis gas is through falling rapidlyAfter temperature condensation, send in hot-air system and thoroughly burn and reclaim heat for flue gas mummification through 900～1100 DEG CSystem.
The high mass dryness fraction dewatering type of this process using is first reduced to 40% by moisture percentage in sewage sludge, and follow-up flue gas is dryChange required auxiliary fuel and reduced by 80%, whole technique power consumption is that the wet mud of 70～80Kw/ ton is (moistureRate 80%), gas consumption 10～12Nm3The wet mud of the wet mud of/ton or coal consumption 8～10kg/ ton. CompareHigh temperature carbonization power consumption 75～80Kw/ ton mud that wets, gas consumption 70～75Nm3The wet mud of/ton or coalThe wet mud of consumption 57～62kg/ ton, direct operating cost lowers 15～20%. Compare anhydration and incineration techniquePower consumption 90～120Kw/ ton mud that wets, coal consumption 70～80kg/ ton mud that wets, direct operating cost reducesMore than 35%.
This technique floor space 800 ㎡, can utilize idle land used in Sewage Plant to arrange, have reduced biographySystem mud centrally disposes the cost of transportation of mode, has both been applicable in Sewage Plant factory, disperseing to dispose on a small scale, alsoBe suitable for large-and-medium size cities Sewage Plant and reduce Treatment of Sludge disposal unit.
This process stream of table .3. changes
This technique of table .4. and similar process energy consumption level contrast
By reference to the accompanying drawings embodiments of the invention are described above, but the present invention is not limited toThe detailed description of the invention of stating, above-mentioned detailed description of the invention is only schematically, instead of restricted, those of ordinary skill in the art, under enlightenment of the present invention, is not departing from aim of the present invention and rightRequire, in the scope situation protected, also can make a lot of forms, these all belong to protection of the present invention itIn.
Claims (10)
1. for a system for municipal sludge flue gas mummification temperature pyrolysis charring, it is characterized in that, compriseHot air apparatus and the charging being connected successively store up metering device, low-temperature flue gas desiccation apparatus, sack cleaner,In warm solution carbonizing apparatus, flue gas waste heat recovery apparatus and tail gas clean-up odor removal, described hot air apparatus isLow-temperature flue gas desiccation apparatus and in warm solution carbonizing apparatus hot blast is provided.
2. the system for municipal sludge flue gas mummification temperature pyrolysis charring according to claim 1,It is characterized in that, described low-temperature flue gas desiccation apparatus comprises drying, and air intake is arranged at described drying bottomRoad, described drying inside is provided with centrifugal spraying dish, and air inlet duct is positioned at the below of atomizing disk, centrifugalAtomizing disk is connected with drive motors, and described centrifugal spraying dish top is provided with sewage sludge feed pipe, sewage sludge feedPipe is connected with screw feeder, and the top of described drying is provided with flue dust outlet;
3. the system for municipal sludge flue gas mummification temperature pyrolysis charring according to claim 1,It is characterized in that, described in warm solution carbonizing apparatus comprise pay-off, housing and hot blast distributing pipe, described inPay-off is connected with the top of housing, and the top of described housing is provided with preheating and drying district, described preheating and dryingIn district, be provided with multiple distribution rake teeths that are crisscross arranged up and down and cloth distribution plate, described cloth distribution plate is fixed onThe inwall of housing, described distribution rake teeth is fixed on rotating shaft, and described rotating shaft is connected with drive unit, instituteState below, preheating and drying district and be provided with pyrolysis reaction region, the below of described pyrolysis reaction region arranges carbide and separatesPlate, described hot blast distributing pipe is to heat air delivery in preheating and drying district and pyrolysis reaction region.
4. the system for municipal sludge flue gas mummification temperature pyrolysis charring according to claim 1,It is characterized in that, described charging is stored up metering device and is comprised that mud receives storehouse, some outlet valves and metering spiral shellRevolve, municipal sludge adopt sealed transport vehicle or sludge pump be delivered to mud receive regulate in storehouse balanced follow-upDevice flow, receives bottom, storehouse metering screw through mud and measures and be delivered to flue gas desiccation apparatus.
5. the system for municipal sludge flue gas mummification temperature pyrolysis charring according to claim 1,It is characterized in that, the combustion-supporting gas of hot air apparatus is sent in described flue gas waste heat recovery apparatus preheating.
6. the system for municipal sludge flue gas mummification temperature pyrolysis charring according to claim 1,It is characterized in that, described flue gas waste heat recovery apparatus adopts fin strengthening cross-ventilation heat exchange structure.
7. the system for municipal sludge flue gas mummification temperature pyrolysis charring according to claim 1,It is characterized in that, the dewatered sludge in described sack cleaner send into by pneumatic transport equipment in warm solutionCarbonizing apparatus.
8. the system for municipal sludge flue gas mummification temperature pyrolysis charring according to claim 1,It is characterized in that, described tail gas clean-up odor removal is connected with adsorption tower and chimney.
9. the system for municipal sludge flue gas mummification temperature pyrolysis charring according to claim 1,It is characterized in that, described in warm solution carbonizing apparatus be connected with carbide packing device.
10. the system for municipal sludge flue gas mummification temperature pyrolysis charring according to claim 3,It is characterized in that, described in warm solution carbonizing apparatus also comprise gas-solid separator, described housing is provided with cigaretteGas outlet, the entrance of described gas-solid separator is connected with described exhanst gas outlet, described gas-solid separator topBe provided with separating flue outlet, bottom is provided with solid outlet, described solid outlet be arranged on returning on housingMaterial mouthful connects.
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| CN111156529A (en) * | 2019-12-30 | 2020-05-15 | 李泽明 | Method and system for preparing fuel incineration hazardous waste from domestic sludge |
| CN111747628A (en) * | 2020-07-16 | 2020-10-09 | 南京中电环保固废资源有限公司 | Sludge drying system and process with water content of 80% |
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| CN113929276A (en) * | 2021-11-12 | 2022-01-14 | 中国石油化工股份有限公司 | Coal gasification sludge treatment method and coal gasification production method |
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