CN201999838U - Sludge treatment system - Google Patents
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- CN201999838U CN201999838U CN2010206677484U CN201020667748U CN201999838U CN 201999838 U CN201999838 U CN 201999838U CN 2010206677484 U CN2010206677484 U CN 2010206677484U CN 201020667748 U CN201020667748 U CN 201020667748U CN 201999838 U CN201999838 U CN 201999838U
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The utility model provides a sludge treatment system, which comprises an incinerator used for incinerating sludge and a tail gas treatment device used for treating tail gas produced after the sludge is incinerated by the incinerator, and is characterized by additionally comprising a sludge drying device placed in front of the incinerator and used for drying the sludge to be incinerated by the incinerator, and a sludge conveyor used for facilitating the conveying of the sludge in the sludge drying device. The sludge treatment system has the advantages of low cost and good effect.
Description
Technical field
The utility model relates to the disposal of wet mud, especially relates to a kind of compound sludge treating system.
Background technology
Mud is as the regular product of municipal sewage plant and industrial enterprise's sewage works, and it occupies critical role in energy-saving and emission-reduction and ecological construction process.The sewage work of China city and enterprise produces a large amount of wet mud every day, and mud is the concentrated of pollutent in the water treatment procedure, mainly form by microorganism cells colony and its disintegration product, except that the organic content height, objectionable impuritiess such as the plurality of heavy metal ion that also contains, pathogenic bacteria, and have the water ratio height, volume is big, characteristics such as complex shape, difficulty of transportation.If mud can not get treatment and disposal timely and effectively, will threaten human life from air, underground water and food chain three aspects, not only the not solution of originally serious water pollution problems, brought new environmental problem on the contrary again.Therefore strengthen sludge treatment disposal and recycling thereof and become one of main path of urban water-body pollution reduction.Mud how that output is huge, complicated component is turned waste into wealth, and makes it to become human available resource, has become a hot subject of the China and world today research.
Current treatment and disposal to mud, mainstream technology and method that different countries adopts are different.The U.S., Britain are based on agricultural (domestic sludge), and West Europe is based on the mud landfill, and Japan is based on burning.And China is at present mostly based on landfill.
Directly landfill disposal has that treatment capacity is big, the advantage of instant effect.But this method need solve the seepage of mud sepage objectionable constituent and the safe disposal of the methane gas that sludge fermentation produces, and environmental requirement and technical requirements are very high.Studies show that domestic employing sanitary landfill mode is carried out the project of sludge disposal, all can't reach standard-required, carry out sanitary landfill according to standard, cost is very expensive, and must take the land resources of a large amount of preciousnesses.
Agricultural use also claims compost treatment, is having under the condition of control, and organic waste is degraded under microbial process, and organism is transformed to stable soil ulmin direction, and its product is referred to as compost.But fermentation gas that produces in the compost treatment process and the heavy metal in the mud, salinity and other difficult degradation organic poison etc. are not fundamentally removed.Studies show that: behind the continuous 10 years applying sludges, cadmium, zinc, copper content all significantly raise in the soil, and the paddy rice of plantation, vegetables are subjected to serious pollution, and mud uses manyly more, and pollution condition is serious more.So the composting of mud can not fundamentally solve the sludge treatment handling problems, bring new pollution crisis on the contrary.
Burning be utilize the organic composition of mud higher, have characteristics such as certain calorific value and come disposing sludge.It adopts incinerator, and wet mud is carried out burning disposal.Wherein, incinerator comprises rotary type incinerator, vertical multi-sectional incinerator, circulating fluidized bed incinerator (CFB) etc.Especially adopt circulating fluidized bed incinerator (CFB) to burn and to satisfy more and more stricter environmental requirement and fully handle the part mud that is unwell to recycling.Utilize in the process of circulating fluidized bed burning, all germs, pathogenic agent are all thoroughly killed, the oxidized decomposition of poisonous and hazardous organic residue, and can in combustion processes, control NO effectively
xAnd SO
2Generation and discharging, in addition, the ash comprehensive utilization of generation.
In addition, other sludge treatment method of disposal is also being studied by various countries now, as: utilize phosphor resource technology, mud braking thing feed, mud preparing active carbon or charing mud, mud system petrochemical materials, sludge through ultrasonic waves processing, the mud of seawater to prepare methods such as haydite, mud to prepare adsorbent.These methods mostly are in conceptual phase, also have very high technical requirements in addition, carry out very difficult in a short time realization of processing of mass to mud.
Though from above-mentioned each treatment process, it is a kind of the most effective mud that wet comparatively speaking mud directly burns with CFB.But this treatment process still has many drawbacks.For example, the method and system that the Chinese patent 200510038416.3 disclosed a kind of CFB of utilization incinerators burn wet mud, its applicant's Changzhou First Thermal Power Plant burns wet mud by the CFB technology, though the indexs such as De dioxin, oxynitride, sulfide and lead, cadmium, mercury of discharging, all be better than consumer waste incineration and pollute the control criterion limit value, then brickmaking utilization of lime-ash, contained heavy metal solidifies substantially, has eliminated secondary pollution.But, burn directly not sending in the stove in this technology through the wet mud of mummification, a large amount of moisture content need to evaporate in stove in the mud, and exhaust gas volumn is big, and pollutant discharge amount is big, the boiler tail seriously corroded, simultaneously a large amount of water evaporates power consumptions are big, the processing cost height, and the sludge treatment ability also is subjected to certain restriction, this technology can't realize low cost, handles mud on a large scale.In addition, it is reported and adopt " the combustion-supporting circulating fluidized bed of coal " technology to build seat of honour sludge incineration power generating demonstration project in Chinese Shaoxing, Zhejiang Province city, but the frequent blocking of this project mud delivery system, cause operation stability relatively poor, and adopt full heat drying technology, the energy consumption height, mummification efficient is low, every day, mud handling capacity was limited, and the sludge treatment cost is higher.
The utility model content
The purpose of this utility model is to provide a kind of can solve weak point in the above-mentioned technology, to realize safety, efficient, low cost, resource utilization, innoxious, minimizing, stabilization, the sludge treating system of industrialization disposing sludge (comprising industrial sludge and/or domestic sludge) on a large scale.
For this purpose,
The utility model comprises a kind of sludge treating system, and it comprises:
-incinerator, described incinerator is used for burning sludge; And,
-exhaust gas processing device, it is used to handle the tail gas that produces behind the described incinerator burning sludge;
It is characterized in that described treatment system also comprises:
-sludge drying device, it places before the incinerator, is used for the mud that mummification will be burned by described incinerator, and
-mud transfer roller is so that the conveying of mud in described sludge drying device.
Wherein, described incinerator is circulating fluidized bed incinerator (CFB), its with coal as ignition dope.
In addition, the sludge drying device preferably adopts mechanical deep dehydration device and heat drying device, and wherein said mechanical deep dehydration device is water content that 75% to 90% mud mechanically dewaters to water content 65% to 70%; Described heat drying device is reduced to a safe storage value to the water content of mud after described mechanical deep dehydration device.
Wherein, this mechanical deep dehydration device is preferably the extruding type expeller, and this heat drying device is super disk sludge drying machine.And described mud transfer roller is preferably does not have the defeated machine of axle spiral.
The method for sludge treatment that the utility model comprises is a kind of elevated temperature heat chemical treatment method, have the more not available advantages of other processing modes, the lime-ash volume that produces after the sludge incineration has only about 5% of mechanical dehydration mud, its volume reduction rate can reach about 95%, handle through drying and incineration and gas sampling, some pathogenic agent in the mud are thoroughly removed, and poisonous and hazardous organic residue is decomposed by thermooxidizing, and the lime-ash after burning can fully utilize, and does not have harmful substances.In addition, by this sludge treating system and method, can not only overcome the deficiency in the present technology, and can realize sewage sludge harmlessness, minimizing, resource utilization, stabilization better, and can reduce the sludge treatment expense, open up not only a safety but also economic effective processing approach, create better society and economic benefit.
Description of drawings
By reading following explanation, other feature and advantage of the present utility model will become obvious.These explanations only are exemplary, and set forth in conjunction with relevant drawings, wherein:
-Fig. 1 is the process flow sheet according to sludge treating system of the present utility model;
-Fig. 2 is the synoptic diagram according to sludge treating system of the present utility model;
-Fig. 3 is the detailed structure view of the extruding type expeller shown in Fig. 2;
-Fig. 4 A is the detailed structure view of the super disk desiccation machine shown in Fig. 2;
-Fig. 4 B is the local structure detail drawing of the rotating disk of the super disk desiccation machine shown in Fig. 4 A;
-Fig. 5 is the detailed structure view of the Shaftless screw conveyor shown in Fig. 2.
-Fig. 6 is the configuration diagram of the circulating fluidized bed incinerator shown in Fig. 2;
It is pointed out that Reference numeral identical in the accompanying drawing represents same or analogous parts.
Embodiment
Fig. 1 shows an embodiment according to the technical process of sludge treating system of the present utility model, and wherein, this technical process comprises:
-mummification steps A, wherein, wet mud by desiccation apparatus by mummification;
-burn down step B, wherein, the mud after the mummification of described mummification steps A is transported to incinerator and sneaks into ignition dope and carry out mixed burning;
-vent gas treatment step C, wherein, the tail gas that produces in described burn down step B is discharged from after purifying treatment.
Be specifically described below in conjunction with Fig. 1 and 2, at first, in the mummification steps A, the wet mud 40 that is housed in the water ratio 75%～90% (weight ratio) in the wet sludge sump 1 carried out drying and other treatment, make its water content be reduced to a safe threshold values, for example about 42%.Wherein, mummification step has further comprised deep dehydration step and heat drying step.Wherein:
-carry out deep dehydration steps A-1 earlier, in this step, by grab crane 2 wet mud 40 is put into wet sludge bucket 3 earlier, by transfer roller wet mud 40 is delivered to mud mechanical deep dehydration device then, for example centrifuge or extruding type expeller further dewater the wet mud of water ratio 75%～90% to water ratio 65%～70%.
-then, carry out heat drying steps A-2, in this step, adopt the saturation steam of 180 degrees centigrade of heat drying equipment utilizations to make sludge drying, help the safe storage of dewatered sludge like this to water ratio about 42%, with prevent that the dewatered sludge airborne dust from producing and blast, can prevent the corrosion of boiler tail again.Solve the problem that sludge drying is easily blasted well, preserved the calorific value of mud more than 98%.Wherein, this heat drying steps A-2 can adopt traditional heat energy sludge drying and sun power sludge drying.Tradition heat energy sludge drying can utilize mud heat drying equipment that mud is realized drying and other treatment, the mummification mode of this heat drying equipment can be direct mummification, indirectly drying and direct one indirect association type mummification, for example adopts single axle or multiaxial type desiccation machine or super disk sludge drying machine.And the sun power sludge drying utilizes sun power for main energy sources mud to be carried out drying and other treatment, as the Veolia and full Solia technology and the Helantis technology that waits the exploitation of water treatment company of getting profit.
In addition, in deep dehydration steps A-1, the water of being deviate from can be recycled J after purifying treatment, and in heat drying steps A-2, the tail gas that produces in the mud heat drying process is introduced condenser 17, and the condensed water of generation is sent to the desulphurization circulating pond and makes make up water reuse X.
Secondly, in burn down step B, the dewatered sludge 52 of water ratio about 42% is delivered to scraper conveyor 9 by transfer roller 4, by scraper conveyor 9 dewatered sludge 52 is delivered to dewatered sludge storehouse 10 again, the back is delivered to ignition dope storehouse 12 by defeated mud belt 11 with dewatered sludge, with ignition dope, and coal for example, mix the back and be admitted to incinerator, for example rotary type incinerator, vertical multi-sectional incinerator, circulating fluidized bed incinerator etc. by feeding machine 13.Adopt circulating fluidized bed 16 to burn B-1 in the present embodiment.Wherein, the weight ratio of mud and coal is preferably 8: 2, the calorific value of mud coal propellant combination lower (Lower heat value is about 3000 kilocalorie/kilograms), temperature of combustion in the combustion chamber is controlled at 900 ℃～950 ℃, adopt the combustion-supporting control of air stage feeding simultaneously, guarantee reasonably oxygen concn distribution in the stove, controlled NO
XWith the generation of CO, wherein, a bellows chamber in this air stage feeding contains in the tail gas that mud heat drying A-2 produces the waste gas that produces in noncondensing gas not and/or 40 storages of wet mud, and it is admitted to the combustion chamber by Abgasabsaugung blower fan 18 and waste gas fan 20 respectively.By a wind agitaion of this intensive, guarantee that simultaneously propellant combination particle residence time in burner hearth (was air conditions, temperature condition and the time conditions of fuel perfect combustion greater than 3 seconds by " 3T " combustion system.), guaranteed the stable, abundant of mud and coal combustion, effectively suppress the generation of dioxin.In addition, the stokehold can also add limestone powder by the limestone powder feeding device of being made up of limestone powder bin 14 and limestone powder feeding machine 15 in the combustion processes, burns with dewatered sludge, coal, to realize first grade desulfurizing, so that effectively reduce SO in the flue gas
2The generation of objectionable impuritiess such as content and further control dioxin.Mud burns after mummification, and exhaust gas volumn greatly reduces, and mud handling capacity is big, is suitable for extensive, industrialization processing mud.The slag that the burning back generates is put into slag storehouse 46 after cold slag machine 19 is handled, fully utilized Z by outward transport then.The steam that heat energy produced of Fen Shaoing is by counter pressure turbine 31 actings simultaneously, and pushing generator 32 produces electric energy input electrical network D, and the steam discharge after the back pressure type steam turbine work done is sent to hot user R.
Then, in vent gas treatment step C, the waste gas that produces among the burn down step B-1 is first through electrostatic precipitation C-1, again through activated carbon adsorption C-4, bag-type dust C-2, enter double alkali method desulfurizing tower 26 by suction fan 25 then and carry out double alkali method desulfurizing C-3, the tail gas after the final purification is through chimney 27 dischargings.Wherein, the ash that electrostatic precipitation C-1 and bag-type dust C-2 generate is sent to grey storehouse by storehouse pump 28 and fully utilizes H, and double alkali method desulfurizing step C-3 adopts SO
2Generate gypsum with the reaction of alkali, this part desulfurization slag is delivered to Building Materials Factory's comprehensive utilization; Finish SO in the tail gas with contacting of alkaline circulation fluid by tail gas
2Absorption.Its key problem in technology is the recirculation of alkali lye, and also the recirculation of doctor solution has caused the actual calcium sulfur ratio in the thionizer will be far above apparent calcium sulfur ratio just, thereby makes the tail gas can reach higher desulfuration efficiency in the short period of time, and improves the utilization ratio of alkali lye.The whole discharge indexs that can guarantee exhaust gas purification system all reach relevant criterion, simultaneously more economical ground long-term operation.
In addition, indoor closed negative pressure design is all adopted in wet sludge sump 1 and sludge drying workshop, and wet sludge sump 1 and sludge drying workshop are sent waste gas into burner hearth by the Abgasabsaugung blower fan and burned with dewatered sludge and coal.The vehicle import and export of wet sludge sump adopts automatic hermatic door, and when the mud carrier vehicle passed in and out, hermatic door was opened automatically, separates by the air curtain and the external world, and hermatic door is closed at ordinary times.Mud Shop floor control chamber is arranged in the transparent glass room, controls the sludge drying flow process automatically by PLC.Wet mud storage storehouse and sludge drying workshop are in negative pressure state, prevent foul smell and have the waste gas of pollution to leak, and effectively realize environment protection.
Fig. 2 shows the synoptic diagram according to the embodiment of sludge treating system of the present utility model, and this embodiment can realize above-mentioned method for sludge treatment.This sludge treating system comprises:
-sludge drying device is used for the wet mud of mummification;
-mud transfer roller is so that the conveying of mud in described sludge drying device.
-incinerator, described incinerator is used for burning sludge, realizes sewage sludge harmlessness, disposal of resources; And
-exhaust gas processing device, it is used to handle the tail gas that produces behind the described incinerator burning sludge.
Wherein, preferably, the sludge drying device among this embodiment comprises extruding type expeller 5 and super disk sludge drying machine 7; What the mud transfer roller adopted is Shaftless screw conveyor defeated 4; Incinerator adopts circulating fluidized bed 16; And exhaust treatment system comprises electrostatic precipitator 23, sack cleaner 24, gac jet apparatus (comprising activity charcoal powder storehouse 30 and gac spraying plant 29), thionizer 26.Below these devices are described in detail.
As shown in Figure 3, present embodiment adopts extruding type expeller 5 to carry out mechanical deep dehydration, to reduce the energy consumption in the follow-up drying process.Compare with efficient centrifugal water extracter in the past, extruding type expeller compact construction, high dewatering and dewatering efficiency, low motorization can be saved 40% space and about 75% electric energy.It comprises:
-urceolus 53, it has axis J-J;
-screw rod 51, it is closed in the shell 53, and can rotate along axis J-J;
The overanxious net 55 of-metal outer cylinder, it uses as filtering surface, and has worry net washing unit 56.Need not change screen cloth during use, make work-ing life elongated, and cleaning can purge to combine and carry out by rotating through filter screen and pressurized air, not need water to clean, reduce the generation of sewage;
-mud feeding mouth 57, the end that it is positioned at urceolus 53 is used to receive wet sludge sump 1 and carries the wet mud 40 of coming;
Mud discharge port 61, it is positioned at the other end of urceolus 53, is discharged from this by the mud of deep dehydration;
-drive unit, it comprises propulsion source (not shown), driving chain 58 and high torsion gear reduction unit 59, this drive unit is used for reversing of drive screw 51.
The working speed of extruding type expeller 5 is 0.1～2.0r/min, so that make noise very little with vibration, guarantees a good working environment.In addition, this extruding type expeller 5 adopts the cored screw axle, and hollow screw shaft is connected with small amount of steam during operation, in case mud is bonded on the screw shaft; Further dewater to water ratio 65%～70% by the wet mud of extruding type expeller 5 with water ratio 75%～90%, the sewage that extruding produces enters municipal sewage pipe network 60 after treatment, send sewage work to focus on.This deep dehydration can reduce more than 50% the usage quantity of steam in the follow-up drying process.
Fig. 4 A and 4B show in detail the super disk sludge drying machine 7 as the heat drying device among Fig. 2.Should comprise by super disk sludge drying machine 7:
The shell 71 of-one two-double cylinder, doubleshell 71 1 ends comprise that mud import 701, the other end comprise dewatered sludge outlet 702.Simultaneously, there is steam medium to flow through from the inside in this doubleshell 71 by steam inlet 74, give mud heat by the inwall indirect communication on the one hand, improve mummification efficient and the bonding that prevents inwall mud, simultaneously logical steam medium in the crustless sandwich, can accelerate the desiccation machine thermal expansion, guarantee and the dynamic and static gap of rotating disk, prevent to wipe and bump, reduce wear, shorten start time, long service life;
(Fig. 4 B is the partial enlarged drawing of 7D part among Fig. 4 A to-one group of rotating disk 73, so that more be shown clearly in rotating disk 73), this rotating disk 73 is made up of tubular shaft 731 and disc 732, having steam medium to pass through steam inlet 75 in tubular shaft 731 and each disc 732 flows into, give mud the heat indirect communication, mud passes through between rotating disk 73 and housing 71, accepts each disc 732, tubular shaft 731, the heat that housing 71 transmits, evaporation moisture content.To evaporate 17 condensations of moisture content suction condenser by sucktion fan 18.In addition, flat pen feather 76 is housed on the rotating disk 73 and send pen feather 77,76 stirring actions of flat pen feather send pen feather 77 to play and stir and send the mud effect, guarantee that mud fully stirs in desiccation machine and promotion mud flows to assigned direction.
-transmission rig 79, it is used to drive rotating disk 73 at doubleshell 71 internal rotation.
In addition, each disc has double-sided heat transfer, and heat transfer area is big, and thermo-efficiency height, rotary speed are 2.0～5.0r/min, and therefore wearing and tearing are very little.In inner walls fixed is housed and cuts open trowel 78, extend the space between the rotating disk, prevented that bulk mud is cemented on the disc 732.Also play simultaneously the effect of stirring mud, mud directly forms particle in desiccation machine.
Further, doubleshell 71 tops are provided with air supply mouth 705 makes exhaust emissions more smooth and easy, and system loading is little.
The semi-dry sludge of water ratio 65%～70% is sent into super disk desiccation machine 7 through transfer roller 4 behind above-mentioned degree of depth mechanical dehydration, all be connected with steam in desiccation machine housing and the rotating disk, by regulating mud amount and desiccation machine rotating speed (2.0～5.0r/min), moisture percentage in sewage sludge after the mummification is controlled at a safe water content, for example about 42%, help the safe storage of dewatered sludge like this and prevent that the dewatered sludge airborne dust from producing and blast, can prevent the corrosion of boiler tail again.Solve the problem that sludge drying is easily blasted well, preserved the calorific value of mud more than 98%.Steam condensate reclaims by condensation-water drain 703 in the mud heat drying process turntable 73, and steam condensate reclaims by shell condensation-water drain 706 in the shell 71, and this two portions water of condensation is sent the deoxygenator utilization back to by drainage pump.The tail gas that produces in the mud drying process is introduced condenser 17 by the exhaust port on the housing 71 704, by sucktion fan with in the condenser 17 not agglomerative gas send into incinerator burning, prevent that waste gas from leaking, by condensate pump the condensed water in the condenser 17 is delivered to the desulphurization circulating pond and do the make up water reuse.
Compare with in the past single axle or multiaxial type desiccation machine, it is big super disk sludge drying machine 7 to have heat transfer area, mixing effect is good, more can promote the evaporation and the removal of moisture, it has the thermo-efficiency height, the exhaust emissions amount is few, is suitable for the processing and the processing continuously in 24 hours of big sludge quantity, is to realize key extensive, industrialization processing mud.
In above-mentioned mud drying process, adopt Shaftless screw conveyor 4 to carry mud, adopt spiral pump to carry easily obstruction so that overcome in the past, moisture percentage in sewage sludge is required high, fluctuation of service, medium easily leaks, invests big, shortcomings such as power consumption height have also overcome surge pump and have carried the shortcoming that diaphragm damages easily in the mud process.
The Shaftless screw conveyor 4 that Fig. 5 shows in the present embodiment to be adopted, it comprises:
-cylinder housing 41, it has axis W-W, and an end of this housing 41 has sludge inlet 401, and the other end has mud discharge port 402;
-there is not axle spiral 43, it is closed in the housing 41, can rotate around axis W-W;
-transmission rig 45, it can produce nothing axle spiral 43 is rotated around W-W in housing 41, so that carry mud.
Wherein, adopt man-machine interface and PLC control able to programme and utilize frequency transformer to realize regulating nothing axle spiral 43 rotating speeds, regulate the mud operational throughput, and can guarantee the feeding homogeneity; Shaftless screw conveyor 4 and charging and discharging mouth 401,402 adopt Seal Design, and lock wind is effective, has reduced environmental pollution.When long distance is carried mud, adopt the roller-type design to make and do not have the axle spirochete at certain flexible space internal rotation by support 47, solved flexible excessive and cause that complete machine vibrations are big, the phenomenon that noise exceeds standard, adopt tetrafluoroethylene to make liner plate, be difficult for bonding and stop up, can satisfy the long distance of mud and carry requirement.
Incinerator also is the integral part in the native system, in the illustrated embodiment, has adopted circulating fluidized bed 16 as sludge incinerator.Wherein, circulating fluidized bed 16 comprises:
-air-distributing device;
-combustion chamber (burner hearth);
-slag discharging device;
In addition, can also comprise Wingdale feeding device etc.
Wherein, the effect of air-distributing device is that air is evenly distributed on the whole horizontal section in the sludge incinerator load range.Air-distributing device adopts the airduct cap structure, and air compartment is by form quality guarantee temperature concrete in the cast in the air compartment, fin overtemperature when preventing to light a fire, and the fractional cold in the reduction air compartment to antecurvature back water wall and two side walls.
The wind in combustion chamber is introduced air compartment from air channel, the left and right sides, air compartment and burner hearth are separated by by air distribution plate.Air distribution plate is that water wall and band steel weldering system form, and one time wind evenly enters burner hearth by these blast caps.Fluidized bed material, blast cap adopts the Wear-resistant, high-temperature resistant alloy.Be the protecting cloth aerofoil, refractory castable has been watered on air distribution plate top.
For reducing thermosteresis and preventing that personnel from scalding, circulating fluidized bed 16 adopts fire-resistant and lagging material.Adopt insulated combustion chamber, adopt membrane wall; For guaranteeing sealing, the emulsion zone inwall adopts the Wear-resistant, high-temperature resistant corundum moldable, guarantees simultaneously can not wear and tear; The flame retardant coating outside is a lagging material, to reduce heat lost by radiation.
In combustion processes, mud and ignition dope are fed into combustion chamber 163, circulating fluidized bed 16 burning required airs are provided by first and second blower fan 21,22 respectively.The air that primary air fan 21 is sent is through introducing water cooled wind chamber 162 under the stove by air channel, the left and right sides after wind air preheater 161 preheatings, enter combustion chamber 163 by the blast cap on the water cooled wind chamber air distribution plate, the wind that overfire air fan 22 is sent is after air preheater 161 preheatings, spray into burner hearth by the spout 164 that is distributed on 163 front-back walls of combustion chamber, replenish air, add strong disturbance and mix.Burn with the fluidized state blending under the effect of fuel and air through-flow wind transmission machine 160 in the combustion chamber, and carry out heat exchange with heating surface.Wherein, adopt low temperature and air classifying can significantly suppress NO for the combustion technology of usefulness
XGeneration.By " 3T " combustion system, effectively control the existence of objectionable impuritiess such as dioxin simultaneously.Flue gas (carrying a large amount of uncompleted burned carbon particles) in the burner hearth is the heat release of further burning of 163 tops in the combustion chamber.The tail gas that leaves combustion chamber 163 and carry a large amount of materials secretly is after the cold cyclonic separator 165 of scroll casing type vapour, and most materials are separated, and return the combustion chamber through material returning device, realizes circulating combustion.Tail gas after the separation is through reversal chamber, superheater 167, and economizer 168, air preheater 161 is discharged by back-end ductwork 166.
Wherein, in the present embodiment, adopt coal as ignition dope, thus, this circulating fluidized bed 16 has the coal feeding device, and it comprises the ignition dope storehouse 12 of storage dewatered sludge and coal, and feeding machine 13.The mud of process mummification mixes the back with coal and is admitted to incinerator by feeding machine 13 in ignition dope storehouse 12.
In addition, owing to adopted Combustion technology of circulating fluidized,, can significantly reduce SO in the flue gas if by in stove, adding Wingdale
2Concentration.Therefore, this circulating fluidized bed 16 has the limestone powder feeding device, and it comprises limestone powder bin 14 and limestone powder feeding machine 15, and limestone powder is sent into combustion chamber 163 by air conveying through overfiren air port, wherein sprays into by calcium sulfur ratio 2.5.Carry out multifuel combustion so that in burning described mud and coal, add limestone powder, so that realize the desulfuration in furnace efficient more than 80%.
Ash content behind mud and the coal combustion is discharged and is discharged from afterbody with the flying dust form from burner hearth bottom with end slag form respectively.Wherein, end slag is discharged the combustion chamber from the water-cooled slagging pipe on the water-cooled distributor, inserts cold slag machine 169 then.The lime-ash that forms is housed in slag storehouse 46, waits for outward transport comprehensive utilization Z.
At last, the tail gas that produces after burning is handled the back discharge by exhaust gas processing device.This exhaust gas processing device comprises: electrostatic precipitator 23, sack cleaner 24 and double alkali method desulfurizing device, so that handle the tail gas that described circulating fluidized bed 16 is got rid of successively.Wherein, the flue of sack cleaner 24 imports also is equipped with gac jet apparatus (comprising activity charcoal powder storehouse 30 and gac spraying plant 29), so that add a certain amount of active carbon powder heavy metal ion and dioxin is adsorbed.Wherein, at first remove most of flue dust from the incinerator tail gas discharged through electrostatic precipitator 23, add a certain amount of active carbon powder at flue from the sack cleaner import, heavy metal ion and dioxin are adsorbed, absorption agent in reactor with the flue gas contact reacts, remove De dioxin, heavy metal ion etc. in the flue gas.Enter sack cleaner 24 then, further the dust in the flue.At last, carry out two alkaline process secondary desulfurizations, make the reaction of S02 and alkali generate gypsum, finish SO in the flue gas with contacting of alkaline circulation fluid by tail gas by desulfurization king-tower 26
2Absorption.Wherein, the recirculation of doctor solution has caused the actual calcium sulfur ratio in the thionizer will be far above apparent calcium sulfur ratio, thereby makes the flue gas can reach higher desulfuration efficiency in the short period of time, and improves the utilization ratio of alkali lye.The whole discharge indexs that can guarantee flue gas purification system all are up to state standards, simultaneously more economical ground long-term operation.
Further, the applicant uses above-mentioned embodiment, by actual industrial practice, sets up day 2050 tons of sludge drying production lines of processing.Wherein 1 260t/h High Temperature High Pressure of auxiliary construction circulating fluidized bed sludge incinerating boiler and 1 back pressure type steam turbine generating set.Moisture percentage in sewage sludge about 42% after the mummification, burns by mud, the part by weight of coal than 8: 2, both can satisfy the burning requirement, also guaranteed the security of mud storage and the accessible property of conveying, obtained following effect behind the project operation:
1, dewatered sludge calorific value index:
2, main running technology index
3. major economic indicators
| Sequence number | Project | Project reaches |
| 1 | Moisture percentage in sewage sludge after the mummification (%) | ＜45 |
| 2 | Running cost (unit's ton -1) | ＜85 |
| 3 | Save mark coal amount (ton year -1) | ＞50000 |
| 4 | Water saving (ton year -1) | ＞10000 |
To sum up, present embodiment is burned after adopting first mummification, and especially in the drying process, the sludge drying technology that adopts the extruding type expeller to combine with super disk desiccation machine has advantages such as energy consumption is low, processing power is big.
In addition, the utility model is not subject to above-mentioned embodiment, and comprises any embodiment that is equal to.
Claims (16)
1. sludge treating system, it comprises:
-incinerator, described incinerator adds ignition dope and mud mixed burning; And
-exhaust gas processing device, it is connected with described incinerator, is used to handle the tail gas that produces behind the described incinerator burning sludge;
It is characterized in that described treatment system also comprises:
-sludge drying device, it places before the described incinerator, is used for the mud that mummification will be burned by described incinerator, and
-mud transfer roller is so that the conveying of mud in described sludge drying device.
2. treatment system according to claim 1 is characterized in that, described incinerator is circulating fluidized bed (16).
3. treatment system according to claim 1, it is characterized in that, described desiccation apparatus comprises mechanical deep dehydration device and heat drying device, and wherein said mechanical deep dehydration device is water content that 75% to 90% mud mechanically dewaters to water content 65% to 70%; Described heat drying device is reduced to a safe storage value to the water content of mud after described mechanical deep dehydration device.
4. treatment system according to claim 3 is characterized in that, described safe storage value is a water content 42%.
5. treatment system according to claim 3 is characterized in that, described mechanical deep dehydration device is extruding type expeller (5).
6. treatment system according to claim 5 is characterized in that, described extruding type expeller (5) has metal outer cylinder, filtering net, and the cored screw axle, wherein, when operation, is connected with steam in the described cored screw axle.
7. treatment system according to claim 6 is characterized in that, the working speed of described extruding type expeller (5) is 0.1-0.2r/min.
8. treatment system according to claim 1 is characterized in that, described heat drying device is traditional heat energy sludge drying machine.
9. treatment system according to claim 8 is characterized in that, described traditional heat energy sludge drying machine is a super disk sludge drying machine (7).
10. treatment system according to claim 9 is characterized in that, described super disk sludge drying machine (7) is made up of shell and one group of single shaft rotating disk of a two-double cylinder, wherein, has steam medium to flow through in the described doubleshell; Described rotating disk is made up of tubular shaft and a plurality of disc, has steam medium to flow through in described tubular shaft and a plurality of disc, and flat pen feather also is housed on the described disc and send pen feather; And described outer casing inner wall is equipped with fixed and cuts open trowel, and it extends to the space between the described rotating disk, has steam medium to flow through in double-deck shell.
11. treatment system according to claim 10 is characterized in that, the working speed of described super disk sludge drying machine (7) is 2-5r/min.
12. treatment system according to claim 1 is characterized in that, described mud transfer roller is a Shaftless screw conveyor.
13., it is characterized in that described circulating fluidized bed (16) has the coal feeding device according to each described treatment system among the claim 2-11.
14. treatment system according to claim 13 is characterized in that, described circulating fluidized bed (16) has the limestone powder feeding device.
15. treatment system according to claim 14 is characterized in that, described exhaust gas processing device comprises, electrostatic precipitator, sack cleaner and double alkali method desulfurizing device.
16. treatment system according to claim 15 is characterized in that, also is provided with the gac jet apparatus between described electrostatic precipitator and the sack cleaner.
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| CN2010206677484U CN201999838U (en) | 2010-12-15 | 2010-12-15 | Sludge treatment system |
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| CN2010206677484U CN201999838U (en) | 2010-12-15 | 2010-12-15 | Sludge treatment system |
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