CN202945130U - Sludge treating system utilizing cement kiln - Google Patents

Sludge treating system utilizing cement kiln Download PDF

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Publication number
CN202945130U
CN202945130U CN2012206570429U CN201220657042U CN202945130U CN 202945130 U CN202945130 U CN 202945130U CN 2012206570429 U CN2012206570429 U CN 2012206570429U CN 201220657042 U CN201220657042 U CN 201220657042U CN 202945130 U CN202945130 U CN 202945130U
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sludge
mud
waste
transporting mechanism
drying
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张小雄
陈文和
邓明佳
罗辉
吴齐跃
曾钜键
刘志强
刁宇江
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GUANGZHOU YUEBAO CEMENT CO Ltd
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GUANGZHOU YUEBAO CEMENT CO Ltd
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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
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The utility model discloses a sludge treating system utilizing a cement kiln. The sludge treating system is characterized by comprising a sludge drying device, a sludge incinerating device, a sludge-drying waste-gas treating device, a waste-water treating device, a first transferring device, a second transferring device and a third transferring device, wherein the first transferring device is used for transferring the dried sludge to the sludge incinerating device; the second transferring device is used for transferring the sludge-drying waste gas to the sludge-drying waste-gas treating device; the third transferring device is used for transferring the waster water generated by the sludge-drying waste-gas treating device to the waste-water treating device; the sludge drying device is connected with the sludge incinerating device through the first transferring device and is also connected with the sludge-drying waste-gas treating device through the second transferring device; and the sludge-drying waste-gas treating device is connected with the waste-water treating device through the third transferring device. The whole sludge treating system ensures that no waste residue and waste water are discharged and the waste gas discharge amount is lower than the discharge limit of the national discharge standard, thereby achieving the purposes of recycling and harmless treatment of the sludge.

Description

Cement kiln lignin-sludge system
Technical field
The utility model belongs to waste treatment and utilizes the field, particularly relates to a kind of cement kiln lignin-sludge system.
Background technology
The sewage work of China city and enterprise produces a large amount of wet mud every day, mainly by microorganism cells colony and its disintegration product composition, except the organic content height, also contain the objectionable impuritiess such as plurality of heavy metal ion, pathogenic bacteria, and have the features such as water ratio is high, volume large, complex shape, difficulty of transportation.
The treatment process of municipal sludge mainly contains landfill, the fertile and burning as farming.Because heavy metal substance and the pathogenic bacterium of mud high-content can be spread in soil, can cause the highly polluted of soil and soil surface Planting Crops, landfill mud occupies that a large amount of soils, processing costs improve day by day and along with the raising of environmental protection standard and the enforcement of the policy of recycling, landfill method will not be sustainable development path.Method for sludge treatment take burning as core is method for sludge treatment the most thoroughly at present.
At present the domestic technology of utilizing cement kiln to process municipal sludge is mainly to utilize the direct burning sludge of cement kiln, is about to that mud is directly delivered to smoke-box or decomposing furnace burns.But have following problem: due to sludge moisture content large (more than 80%), calorific value is low, directly brings the fuel that kiln system burns needs consumption a large amount of into, and energy consumption is large, causes treatment capacity limited.
The utility model content
Based on this, the purpose of this utility model is to provide a kind of cement kiln lignin-sludge system.
Concrete technical scheme is as follows:
A kind of cement kiln lignin-sludge system, comprise sludge drying mechanism, sludge incineration device, mud oven dry emission-control equipment, wastewater treatment equipment, be used for dried mud be sent to described sludge incineration device the first transporting mechanism, be used for mud dry waste gas be sent to described mud oven dry emission-control equipment the second transporting mechanism, be used for mud is dried the 3rd transporting mechanism that waste water that emission-control equipment produces is sent to described wastewater treatment equipment;
Described sludge drying mechanism is connected with described sludge incineration device by the first transporting mechanism, described sludge drying mechanism is connected with described mud oven dry emission-control equipment by the second transporting mechanism, and described mud oven dry emission-control equipment is connected with described wastewater treatment equipment by the 3rd transporting mechanism.
In embodiment, described mud oven dry emission-control equipment comprises absorption tower, bio-trickling filter and the 4th transporting mechanism that is used for the waste gas that the absorption tower produces is sent to described bio-trickling filter therein; Described absorption tower is connected with described sludge drying mechanism by the second transporting mechanism; Described bio-trickling filter is connected with described absorption tower by the 4th transporting mechanism.
In embodiment, described wastewater treatment equipment is provided with successively by the wastewater treatment order therein: vertical sedimentation basin, efficient anaerobic pond, one-level contact-oxidation pool, hydrolysis acidification pool, two-stage biological contact oxidation pond, quartz filter, activated charcoal filter, ultra-fine filter.
The beneficial effects of the utility model:
Burning method is one of the main method of the mud of Treating Municipal Sewage factory, and its main process is first mud to be carried out drying, and then burns.More than 80%, directly burning needs a large amount of fuel, very uneconomical due to the primary sludge water ratio.Usually first drying sludge is dewatered before burning, dried sludge volume will reduce greatly, and the dewatered sludge main component is the carbon organic matter, and calorific value is higher, then by burning method, its decomposition can be saved a lot of fuel.The sludge incineration product only has a small amount of inorganic salt residual components, and volume is minimum, the convenient disposal.
Adopt the burning method disposing sludge, the expense of fuel remains a very large expenditure.But this is the thing that follows a well mapped-out plan concerning the cement mill, the exhaust temperature of cement kiln end discharging is still had an appointment 300 ℃, directly discharging is tantamount to great waste, utilize this part waste heat to be used for sludge-drying, then dried dewatered sludge is dropped into cement kiln and burn decomposition, mud is harmlessness disposing fully, and the utilization ratio of the energy also improves greatly.
This technique also is provided with mud oven dry emission-control equipment, and this device comprises absorption tower and bio-trickling filter, and mud oven dry waste gas is removed wherein SO by the absorption tower 2And water-soluble foul smell composition, then utilize residue malodor components in the thermophilic microflora degradation foul waste gas of high temperature deodorizing in biologic packing material by bio-trickling filter.Deodorizing effect is obvious, need not matched cooling system, avoids a large amount of water of condensation to separate out, reduced investment, and running cost is low.
The utlity model has following characteristics: sludge disposal has been recycled the cement kiln waste gas heat, the alternative part of fuel of dewatered sludge and raw material; The waste water that flare system produces reclaims use, the whole system wastewater zero discharge after treatment; Recycling sludge and innoxious processing disposal have been realized; The sludge disposal amount is large, but every day, disposing sludge reached 600 tons, had greatly alleviated the pressure of city disposing sludge; Meet market demand and Economic development requirement, meet the requirement of save energy, low-carbon economy and environment protection.
Description of drawings
Fig. 1 is the utility model cement kiln waste gas lignin-sludge system schematic.
Description of reference numerals:
101, sludge drying mechanism; 102, mud oven dry emission-control equipment; 103, sludge incineration device; 104, wastewater treatment equipment; 105, absorption tower; 106, bio-trickling filter; 107, the second transporting mechanism; 108, the first transporting mechanism; 109, the 3rd transporting mechanism; 110, the 4th transporting mechanism.
Embodiment
Below by specific embodiment, the utility model is further elaborated.
With reference to figure 1, the described a kind of cement kiln lignin-sludge of the present embodiment system, comprise sludge drying mechanism 101, sludge incineration device 103, mud oven dry emission-control equipment 102, wastewater treatment equipment 104, be used for dried mud be sent to described sludge incineration device the first transporting mechanism 108, be used for mud dry waste gas be sent to described mud oven dry emission-control equipment the second transporting mechanism 107, be used for mud is dried the 3rd transporting mechanism 109 that waste water that emission-control equipment produces is sent to described wastewater treatment equipment;
Described sludge drying mechanism 101 is connected with described sludge incineration device 103 by the first transporting mechanism 108, described sludge drying mechanism 101 is connected with described mud oven dry emission-control equipment 102 by the second transporting mechanism 107, and described mud oven dry emission-control equipment 102 is connected with described wastewater treatment equipment 104 by the 3rd transporting mechanism 109.
Described mud oven dry emission-control equipment comprises absorption tower 105, bio-trickling filter 106 and the 4th transporting mechanism 110 that is used for the waste gas that the absorption tower produces is sent to described bio-trickling filter; Described absorption tower 105 is connected with described sludge drying mechanism 101 by the second transporting mechanism 107; Described bio-trickling filter 106 is connected with described absorption tower 105 by the 4th transporting mechanism 110.
Described wastewater treatment equipment 104 is provided with successively by the wastewater treatment order: vertical sedimentation basin, efficient anaerobic UASB pond, one-level contact-oxidation pool, hydrolysis acidification pool, two-stage biological contact oxidation pond, quartz filter, activated charcoal filter, ultra-fine filter.
The method of above-mentioned cement kiln waste gas lignin-sludge system disposing sludge comprises the steps:
(1) cement kiln end waste gas is delivered to by gas blower sent into sludge drying mechanism, the swirl spouting that drying installation gas was sheared and entered to the mud that enters drying installation by the rotating paddle of drying installation is dispersed in and carries out the heat exchange oven dry in hot gas flow, the dewatered sludge after being dried and mud oven dry waste gas;
The flue gas that leaves kiln tail preheater enters sludge drying mechanism through high-temperature blower.On the waste heat flue gas main pipe line, electric louver valve is set, regulates switch and the flow of the waste heat flue gas that enters sludge drying mechanism.This exhaust pipeline is divided into two strands before entering cyclonic separator, inject respectively two cyclonic separators.Enter the temperature of waste heat flue gas of cyclonic separator at 270-290 ℃, the maximum under the design normal running conditions is 324000Nm by air quantity 3/ h, the dust content of inlet gas is 50g/Nm approximately 3. waste heat flue gas is completed gas solid separation at whirlwind with separator, and the kiln ash advanced the capable blanking device of lock wind type star discharges, and is divided into 2 pipelines through the waste heat flue gas that purifies and enters the sludge drying workshop.The transmitting power of flue gas is provided by 6 gas blowers that are positioned at the sludge drying workshop, is provided with the smoke components monitoring instrument on exhaust pipeline, the oxygen content in the monitoring flue gas.
The swirl spouting drying process is adopted in the mummification of mud, and drying sludge adopts waste gas flue gas and mud directly to carry out the contact heat exchange.Tangentially enter kiln from the waste heat flue gas of cyclonic separator along the side of drying machine kiln, turning back downwards to comb through tower at kiln enters fluidisation-spouted arid region.Mud is entered the column body segment on drying machine top by the Shaftless screw conveyor under the sewage sludge feed storehouse, Shaftless screw conveyor adopts the frequency conversion debugging, by adjusting the rotating speed of the secondary Shaftless screw conveyor before and after the sewage sludge feed storehouse, can pass through the basicly stable of the interior mud material level of stabilized sludge feeding warehouse, realize the continuous, stable, adjustable of mud discharging.The mud that enters sludge drying mechanism drops downwards, carry out inverse motion with flue gas, in the process of relative movement, Sludge Surface realizes dry sclerosis rapidly, mud is in drying process, and flue gas enters from drying machine bottom with suitable spouted speed and stirs broken kiln, to material produce strong shearing, blow floating, turning effort, form larger specific surface area, strengthened the material heat transfer.In the drying machine bottom, more greatly, wet cluster of grains is under the effect of agitator, by Mechanical Crushing, and torn by the spouted hot gas flow of high speed, form new desiccated surface, and the particle that water capacity is lower, the particle dynamics is less is rotated air-flow and carries rising secretly, and is further dry in uphill process, and is graded.Mechanism with agitator is washed away to the rotation of wall by drying machine inner cone mechanism, air-flow, forces material to be wrapped up in by high velocity air and takes, very suitable disposal viscosity dry substance.The drying process of material mainly reaches rapidly balance in the eddy flow district, under the effect in centrifugal rotary flow field, the speed that the heat exchange between gas-solid is carried out is very fast, and the drying process deadline of material is very short, and the specification of equipment can realize significantly reducing.Material is completed granulating in drying process, do not need to be shaped or to carry out the one's water breaks operation.Because material in drying process is subject to fragmentation, washes away, collides, surface-area increases, and has strengthened drying; Because the hottest flue gas directly contacts the wettest mud, can improve inlet temperature simultaneously, the dry tenacity of equipment is higher.
Utilize drying machine upper air difference to different mummification degree mud carrying capacitys under centrifugal action, realize the classification to sludge drying, the mud that mummification is good leaves drying machine under the carrying of air-flow, and the temperature of flue gas drops to 130 ℃ by 260 ℃ that enter.The ash-laden gas that leaves drying machine is admitted to bag collector.Leave that the dust that carries in the flue gas of drying machine is mainly dewatered sludge that sludge drying forms and remaining kiln ash mixture in waste gas pre-treatment gas solid separation process, in dust-precipitator, most mud/raw meal particulates are captured, and during through the flue-dust retainer of dust-precipitator with as air valve, the rotary feeder of standby enters 4 chain conveyors that are arranged in parallel.The dewatered sludge particle is sent into the dried hopper dredger of mud along multistage chain conveyor, lift.The smoke moisture content that enters bag collector reaches 11-13%, and larger smoke moisture requires bagroom must carry out good sealing and insulation, to prevent the dewfall scene a little occurring leaking out.
Through the drying sludge waste gas that purifies, enter mud oven dry emission-control equipment by booster fan and carry out further deodourizing.
(2) step (1) being obtained dewatered sludge is sent to sludge incineration device by the first transporting mechanism and carries out burning disposal;
(3) step (1) being obtained mud oven dry waste gas is sent to mud oven dry emission-control equipment by the second transporting mechanism and processes;
Step (1) obtains mud oven dry waste gas after the sack cleaner dedusting, is entered by the middle part, absorption tower after booster fan, and after washing by spraying layer, the pollutents such as the sulfurous gas in waste gas, HCl, HF are absorbed by the slurries drop.The temperature of carrying out described mud oven dry waste gas after cooling, desulfurizing through the absorption tower is less than 63 ℃, and sulphur content is lower than 50mg/m 3Upwards after removing drop, the mist eliminator on top, absorption tower enters again bio-trickling filter through the smelly waste gas that contains after washing desulphurization, be provided with biologic packing material in bio-trickling filter, when containing smelly waste gas and flowing through microbial film take low flow velocity, at first wherein foul smell molecule adsorbs for microbial film, then absorbed degraded by the microorganism on microbial film and form harmless carbonic acid gas, water, inorganic salts and microorganism self, reach the purpose of deodourizing.Exhaust air deodorization is by the smoke stack emission of bio-trickling column overhead.
Be provided with blast aerator at the bottom of the absorption tower in circulating water pool to the slurries oxygenation, calcium sulfite oxidation is become CaSO 4, then by the gypsum slurries overboard pump, gypsum slurries being delivered to the gypsum swirler and carrying out the separation of slag liquid, dense slag slurry is delivered to the vacuum belt dewaterer dehydration and is obtained approximately 10% gypsum of water ratio, and gypsum is transported to cement mill gypsum warehouse after rinsing the removal chlorion.The parting liquid backflow spray column recycle slurry liquid pool that the gypsum swirler is discharged, the filtrate of vacuum belt dewaterer drains into Waste Water Treatment and processes.
Bio-trickling filter is established the biological cycle pond, and supporting have blast aeration system and a circulated sprinkling system, and blast aeration system is by aeration aerating in water, then sprays to biologic packing material by the circulated sprinkling pump, can keep the microorganism active in biologic packing material.Due to waste gas after absorption tower cooling spent air temperture near dew-point temperature, during through bio-trickling filter, importing and exporting approximately has the temperature difference of 10 ℃, and have water of condensation and separate out this moment, and this part water yield is delivered to Waste Water Treatment and carried out after multiple-stage treatment that reuse to waste water system or plant area afforested, given the floor a flush etc.
(4) waste water that produces after the processing of step (3) process mud oven dry emission-control equipment being sent to wastewater treatment equipment by the 3rd transporting mechanism processes.Described dehydration treatment equipment is provided with successively by the wastewater treatment order: vertical sedimentation basin, UASB pond, one-level contact-oxidation pool, hydrolysis acidification pool, two-stage biological contact oxidation pond, quartz filter, activated charcoal filter, ultra-fine filter.
Because waste water COD concentration is higher, waste water treatment process adopts UASB anaerobic treatment+one-level catalytic oxidation+contact acidication+two-stage biological contact oxidation+coagulating sedimentation that the COD of waste water and suspended substance are significantly cut down, adopt vertical sedimentation basin to carry out pre-treatment to filtrate waste water before UASB, the suspended substance in reduction waste water is to avoid the UASB reactor plugs; Then the waste water after adopting sand filtration+charcoal filter+ultrafiltration technology to biological treatment carries out deep purifying to be processed and to reach reuse after the miscellaneous water standard.
The characteristics that belong to high COD, high suspended matter (SS) for waste water, at first be most suspended substances SS and a small amount of organism that adopts in vertical sedimentation basin removal waste water, filtrate waste water first passes through vertical sedimentation basin, and adding polymerize aluminum chloride and polyacrylamide precipitates, the SS clearance is 80%;
then adopt efficient anaerobic UASB technique to cut down waste water COD, be that waste water in equalizing tank is mixed well through water quantity and quality and pumped into UASB pond (up-flow anaerobic sludge blanket) by lift pump and rise by Chi Dibushui device water distribution, mix with the granular or floc sludge of high density in Sludge Bed in uphill process, organism in mixing process in waste water is decomposed into methane and carbon dioxide by the anaerobism in mud (or facultative) microorganism, the triphase separator that solid-liquid-gas mixture in reactor rises to reactor top carries out the solid-liquid-gas separation, waste water after processing is collected through water collecting dike and is drained into the one-level contact-oxidation pool, methane gas is collected utilization by pipeline, mud after triphase separator separates is because of the volatilization of methane bubble, density increases and to fall after rise downwards at the bottom of the pond.The characteristics of this technique are that sludge concentration is higher in reactor, and by high-order distribution reservoir water inlet, the water-distributing device water distribution at the bottom of the pond utilizes the methane gas that produces in the ascending current of cloth water generates and mud as disturbance power, need not additionally to use power to stir.Make COD reduce by 75% left and right by efficient anaerobic UASB pond.
The UASB water outlet enters the one-level contact-oxidation pool, and blast aeration forms oxygen-enriched environment in the pond, utilizes the organism in the further degrading waste water of aerobic microbiological on biologic packing material; Then waste water gravity flow is carried out the biological treatment of secondary anaerobic-aerobic by hydrolysis acidification pool and two-stage biological contact oxidation pond again, and further the organism in degrading waste water, cut down COD.Waste water after twice anaerobic-aerobic processed enters coagulation reaction tank, dosing coagulant also stirs, make suspended substance and the aging biomembrane reaction that comes off in coagulating agent and waste water form flock, enter again settling tank and carry out mud-water separation, clear water enters intermediate pool and makes the depth type filtration Treatment for Reuse, mud is delivered to sludge thickener, and to carry out gravity settling concentrated, supernatant liquor backflow equalizing tank, concentrated after mud be delivered to mud by the Pneumatic pressure dredge pump and receive the storehouse.
The reuse water treatment process:
Intermediate pool waste water is delivered to quartz filter and activated charcoal filter by filtered water pump and further tackles and filter suspended substance and the organism removed in water and make waste water quality satisfy the subsequent ultrafiltration system requirements.The regularly back flushing (or determining the back flushing frequency according to filtering water) of sand-bed filter and activated charcoal filter, backwashing water is collected into equalizing tank and processes.
The activated charcoal filter water outlet directly enters water tank with strainer, first be conveyed into accurate filter and ultra-fine filter by the ultrafiltration water pump, the molecular state filteration of the hollow-fibre membrane by ultra-fine filter, further remove macromolecular substance and colloidalmaterial in water, reduce and produce water SDI value and organism, the ultra-fine filter water outlet reaches or is better than the miscellaneous water standard, can be by the reuse of reuse pool pump delivery to exhaust air deodorization system, raw mill and ground flushing water.
Sludge treatment technique
Mud in the settling tank bucket regularly is evacuated to sludge thickener with sludge pump and carries out gravity concentration, and the supernatant liquor after concentrating is back to equalizing tank, and thickened sludge is processed through pressing dredge pump force feed to mud to receive the storehouse again.
The above embodiment has only expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.Should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.

Claims (3)

1. cement kiln lignin-sludge system, it is characterized in that, comprise sludge drying mechanism, sludge incineration device, mud oven dry emission-control equipment, wastewater treatment equipment, be used for dried mud be sent to described sludge incineration device the first transporting mechanism, be used for mud dry waste gas be sent to described mud oven dry emission-control equipment the second transporting mechanism, be used for mud is dried the 3rd transporting mechanism that waste water that emission-control equipment produces is sent to described wastewater treatment equipment;
Described sludge drying mechanism is connected with described sludge incineration device by the first transporting mechanism, described sludge drying mechanism is connected with described mud oven dry emission-control equipment by the second transporting mechanism, and described mud oven dry emission-control equipment is connected with described wastewater treatment equipment by the 3rd transporting mechanism.
2. cement kiln lignin-sludge according to claim 1 system, is characterized in that, described mud oven dry emission-control equipment comprises absorption tower, bio-trickling filter and the 4th transporting mechanism that is used for the waste gas that the absorption tower produces is sent to described bio-trickling filter; Described absorption tower is connected with described sludge drying mechanism by the second transporting mechanism; Described bio-trickling filter is connected with described absorption tower by the 4th transporting mechanism.
3. cement kiln lignin-sludge according to claim 1 system, it is characterized in that, described wastewater treatment equipment is provided with successively by the wastewater treatment order: vertical sedimentation basin, efficient anaerobic pond, one-level contact-oxidation pool, hydrolysis acidification pool, two-stage biological contact oxidation pond, quartz filter, activated charcoal filter, ultra-fine filter.
CN2012206570429U 2012-11-29 2012-11-29 Sludge treating system utilizing cement kiln Active CN202945130U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102976575A (en) * 2012-11-29 2013-03-20 广州市越堡水泥有限公司 Sludge treatment system and method in cement kiln
CN104609685A (en) * 2015-01-28 2015-05-13 大连东泰有机废物处理有限公司 Method for co-treating anaerobic digested sludge via cement kiln
CN110201510A (en) * 2019-06-05 2019-09-06 南京化工园博瑞德水务有限公司 A kind of processing method of sludge drying tail gas
CN111957150A (en) * 2020-08-04 2020-11-20 杭州国泰环保科技股份有限公司 Sludge waste gas comprehensive treatment system and operation method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102976575A (en) * 2012-11-29 2013-03-20 广州市越堡水泥有限公司 Sludge treatment system and method in cement kiln
CN104609685A (en) * 2015-01-28 2015-05-13 大连东泰有机废物处理有限公司 Method for co-treating anaerobic digested sludge via cement kiln
CN110201510A (en) * 2019-06-05 2019-09-06 南京化工园博瑞德水务有限公司 A kind of processing method of sludge drying tail gas
CN111957150A (en) * 2020-08-04 2020-11-20 杭州国泰环保科技股份有限公司 Sludge waste gas comprehensive treatment system and operation method thereof

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