CN114702218A - Municipal sludge and gasified slag co-processing method - Google Patents
Municipal sludge and gasified slag co-processing method Download PDFInfo
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- CN114702218A CN114702218A CN202210300181.4A CN202210300181A CN114702218A CN 114702218 A CN114702218 A CN 114702218A CN 202210300181 A CN202210300181 A CN 202210300181A CN 114702218 A CN114702218 A CN 114702218A
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- 239000010802 sludge Substances 0.000 title claims abstract description 114
- 239000002893 slag Substances 0.000 title claims abstract description 71
- 238000003672 processing method Methods 0.000 title claims abstract description 15
- 230000018044 dehydration Effects 0.000 claims abstract description 67
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 67
- 238000000197 pyrolysis Methods 0.000 claims abstract description 43
- 239000012065 filter cake Substances 0.000 claims abstract description 15
- 238000003763 carbonization Methods 0.000 claims abstract description 9
- 238000004064 recycling Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 239000004744 fabric Substances 0.000 claims description 155
- 238000003825 pressing Methods 0.000 claims description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 238000002309 gasification Methods 0.000 claims description 23
- 230000007246 mechanism Effects 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 11
- 230000006872 improvement Effects 0.000 abstract description 10
- 239000000126 substance Substances 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 230000009467 reduction Effects 0.000 abstract description 5
- 208000005156 Dehydration Diseases 0.000 description 53
- 239000002910 solid waste Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 16
- 230000008569 process Effects 0.000 description 8
- 239000003245 coal Substances 0.000 description 5
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- 239000003034 coal gas Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 238000001179 sorption measurement Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 244000052616 bacterial pathogen Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000010866 blackwater Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 235000013601 eggs Nutrition 0.000 description 1
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- 238000001914 filtration Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- -1 silt Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
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- 238000005496 tempering Methods 0.000 description 1
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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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Mechanical Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- Treatment Of Sludge (AREA)
Abstract
The invention discloses a municipal sludge and gasified slag co-processing method, which comprises the steps of uniformly mixing gasified slag and municipal sludge, dehydrating under high pressure, sending the generated mixed sludge filter cake into a pyrolysis carbonizer for medium-temperature pyrolysis carbonization, igniting the generated pyrolysis combustible gas, acting the ignited gas as a heat source on the mixed sludge filter cake for drying, and finally recycling pyrolysis residues containing dried gasified slag components. The invention utilizes the characteristics of the gasified sludge to mix with the municipal sludge to realize the improvement of the sludge dehydration effect, does not need to add a chemical conditioner, does not generate harmful substances, saves the cost and has no pollution, not only can realize better dehydration performance and dehydration effect of the municipal sludge components in the early stage, but also can realize the effective drying treatment of the gasified sludge components in the later stage, does not need additional input energy, realizes the reduction of energy consumption, can solve the problems of high moisture and difficult dehydration of the municipal sludge and the gasified sludge, and realizes the resource recycling of the sludge and the gasified sludge.
Description
Technical Field
The invention relates to a method for treating solid waste materials, in particular to a method for cooperatively treating municipal sludge and gasified slag, and belongs to the technical field of solid waste dehydration treatment.
Background
The municipal sludge solid waste is sludge solid waste generated in urban life and the operation and maintenance processes of urban municipal facilities related to urban life activities, and is the sludge solid waste with the largest quantity. Different from industrial sludge solid waste with high content of inorganic matters such as paper making sludge, printing and dyeing sludge, coal slime tailing slag and the like, municipal sludge solid waste is complex in components due to the fact that the domestic sludge solid waste such as domestic sludge, river sludge, inspection well sludge and the like is mixed, and the municipal sludge solid waste generally comprises solid particles such as silt, fibers, animal and plant residues and coagulated floccules thereof, various colloids, organic matters, adsorbed metal elements, microorganisms, germs, worm eggs and the like. The municipal sludge solid waste treatment method generally needs to be firstly subjected to reduction, stabilization and harmless processing such as concentration, conditioning, dehydration, stabilization, drying or incineration and the like, and then is subjected to sanitary landfill or secondary utilization. In the process of dehydration treatment of municipal sludge solid waste, the municipal sludge solid waste contains free water which can be removed by gravity precipitation and mechanical action, and a large amount of water in the forms of interstitial water, physically bound water, colloidal surface adsorption water, chemically bound water, biological intracellular water, molecular water and the like, so that the municipal sludge solid waste is difficult to be dehydrated compared with industrial sludge solid waste. Because the characteristic that the moisture in the municipal sludge solid waste is combined with sludge particles, the removal by a mechanical method has certain limitation, and the organic matter content and the ash content in the municipal sludge solid waste, particularly the addition amount of a tempering and coagulating agent, have important influence on the final solid content, the greatest problem in the dehydration treatment process of the municipal sludge solid waste is incomplete dehydration, and the mechanical preliminary dehydration (the moisture content of a filter cake after treatment is about 70 percent) is usually carried out by a filter press which realizes extrusion water filtration by changing the pressure volume, such as a plate-and-frame structure filter press, a reducing spiral structure filter press, a chain belt structure filter press, and the like, and the moisture content of the sludge is further reduced by adopting a heat exchange drying mode (the moisture content of the sludge after drying treatment can be generally controlled below 20 percent). This kind of traditional dehydration mode, on the one hand, the moisture content of the filter cake that generates after the preliminary dehydration of machinery is still higher, has fluid property, and its handles the degree of difficulty and cost still higher, and on the other hand, heat transfer mummification is extremely low when adopting natural air-dry mode, and then the consumption is great when adopting the mode that input heat carries out drying process.
Gasified slag (namely coal gasification ash) is an inevitable byproduct in the entrained flow coal gasification process, and the large-scale popularization of the coal gasification technology results in huge annual emission in China. The pore structure in the gasified slag is rich, and the gasified slag has strong adsorption performance, so when the gasified slag in the coal gas generated by the coal gasification technology is treated by adopting a circulating water washing method to obtain clean coal gas, the flocculated gasified slag black water slurry is dewatered by adopting a filter press, a gasified slag filter cake with the water content of 50-70% can be obtained usually, a large amount of land is occupied, the percolate can cause serious pollution to water and soil, and the comprehensive utilization of resources is mainly used for aspects such as building materials, roads, filling and the like after drying treatment at present. However, the existing dehydration and drying treatment method for the high-water-content gasified residue also has the problems of low dehydration efficiency, high energy consumption and the like of the municipal sludge solid waste dehydration and drying treatment method.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the municipal sludge and gasified slag co-processing method, which not only can realize better dehydration performance and dehydration effect of the municipal sludge in the early stage, but also can realize effective drying treatment of the gasified slag in the later stage, and can also realize reduction of energy consumption.
In order to realize the purpose, the municipal sludge and gasified slag synergistic treatment method specifically comprises the following steps:
uniformly mixing the gasified slag and the municipal sludge, wherein the mass percentage of the gasified slag to the municipal sludge is as follows: the gasification slag content is 10-50%, and the balance is municipal sludge;
step two, sending the uniformly mixed sludge into a high-pressure stepping filter cloth dehydrator for high-pressure dehydration, wherein the dehydration pressure is 2-10 Mpa;
feeding the mixed sludge filter cake generated after high-pressure dehydration into a pyrolysis carbonizer for medium-temperature pyrolysis carbonization of municipal sludge components, igniting pyrolysis combustible gas generated by the medium-temperature pyrolysis carbonization, and then acting on the mixed sludge filter cake as a heat source to dry the gasification slag components, wherein the pyrolysis temperature is 400-600 ℃, and the pyrolysis time is 0.5-1 h;
and step four, recycling the medium-temperature pyrolysis residues containing the dried gasification slag components.
As an implementation mode of the invention, the mass percentages of the gasified slag and the municipal sludge in the step one are as follows: the content of the gasification slag is 10 percent, and the rest is municipal sludge; in the second step, the dehydration pressure is 10 Mpa; in the third step, the pyrolysis temperature is 600 ℃, and the pyrolysis time is 0.5 h.
As an implementation mode of the invention, the mass percentages of the gasified slag and the municipal sludge in the step one are as follows: the content of the gasification slag is 25 percent, and the rest is municipal sludge; in the second step, the dehydration pressure is 8 Mpa; in the third step, the pyrolysis temperature is 560 ℃, and the pyrolysis time is 0.6 h.
As an implementation mode of the invention, the mass percentages of the gasified slag and the municipal sludge in the step one are as follows: the gasification slag content is 35 percent, and the rest is municipal sludge; in the second step, the dehydration pressure is 5 Mpa; in the third step, the pyrolysis temperature is 500 ℃, and the pyrolysis time is 0.8 h.
As an implementation mode of the invention, the mass percentages of the gasified slag and the municipal sludge in the step one are as follows: the gasification slag content is 50%, and the rest is municipal sludge; in the second step, the dehydration pressure is 2 Mpa; in the third step, the pyrolysis temperature is 400 ℃, and the pyrolysis time is 1 h.
As a further improvement of the invention, the high-pressure step-by-step filter cloth dehydrator in the step two comprises a filter cloth component and a pressure-applying dehydration component;
the filter cloth component comprises an upper layer filter cloth component and a lower layer filter cloth component; the lower-layer filter cloth component comprises lower-layer filter cloth in a closed-loop structure and filter cloth driving rollers arranged in the closed-loop structure of the lower-layer filter cloth in a supporting mode, the lower-layer filter cloth in the closed-loop structure is integrally divided into lower-layer upper filter cloth and lower-layer lower filter cloth by the two groups of filter cloth driving rollers, roller driving parts are arranged on at least one group of filter cloth driving rollers, and the rear end of the lower-layer filter cloth component is a feeding end while the front end of the lower-layer filter cloth component is a discharging end; the upper filter cloth of the upper filter cloth component is correspondingly erected above the lower filter cloth of the lower filter cloth in parallel;
the pressure applying and dewatering component is erected and installed above the filter cloth component and comprises a supporting frame, a surrounding plate frame and a pressure applying plate; the supporting frame comprises an upper counter-force beam positioned right above the upper-layer filter cloth and a lower pressure-bearing bottom supporting plate correspondingly arranged below the upper counter-force beam in parallel, the lower pressure-bearing bottom supporting plate is provided with a plurality of negative pressure drain holes I penetrating through the top plane of the lower pressure-bearing bottom supporting plate, and the negative pressure drain holes I are connected with a negative pressure water pump through pipelines; a coaming frame which is vertically communicated and has a cylindrical structure is arranged between the upper counter-force beam and the lower pressure-bearing bottom support plate, the coaming frame is connected with the upper counter-force beam through a coaming lifting control mechanism, and the upper filter cloth of the upper layer of filter cloth and the lower layer of filter cloth are positioned between the lower pressure-bearing bottom support plate and the coaming frame; the pressing plate matched with the shape and size of the inner cavity of the surrounding plate frame is arranged in the inner cavity of the surrounding plate frame in a sliding fit mode, the pressing plate is connected with the upper counter-force beam through a pressing oil cylinder in an installing mode, a plurality of negative pressure drain holes II penetrating through the bottom plane of the pressing plate are further formed in the pressing plate, and the negative pressure drain holes II are connected with a negative pressure water pump through pipelines.
As a further improvement scheme of the invention, the cross section of the coaming frame of the high-pressure stepping filter cloth dehydrator is of a rectangular structure matched with the width size of the upper layer of filter cloth.
As a further improvement of the invention, the pressure-applying dewatering components of the high-pressure stepping type filter cloth dewatering machine are arranged in a plurality in parallel along the front and back conveying direction of the filter cloth components.
As a further improvement scheme of the invention, a plurality of support frames of the high-pressure stepping type filter cloth dehydrator share the same upper counter-force beam, and/or a plurality of support frames of the high-pressure stepping type filter cloth dehydrator share the same enclosure plate frame, and a plurality of pressure plates are in butt joint arrangement along the front-back direction.
As a further improvement scheme of the invention, a coaming frame of the high-pressure stepping type filter cloth dehydrator is connected with a supporting frame through a lifting guide mechanism, or a pressure plate of the high-pressure stepping type filter cloth dehydrator in the second step is connected with the coaming frame through the lifting guide mechanism.
Compared with the prior art, the municipal sludge and gasified slag cooperative treatment method adopts a mode of treating waste by waste, utilizes the characteristics of the gasified slag to mix with the municipal sludge so as to improve the sludge dehydration effect, does not need to additionally add a chemical conditioner, does not generate harmful substances, saves cost and has no pollution, not only can realize better dehydration performance and dehydration effect of the municipal sludge in the early stage, but also can realize effective drying treatment of the gasified slag in the later stage, can simultaneously realize energy consumption reduction and drying of the gasified slag without additionally inputting heat, can solve the problems of high moisture and difficult dehydration of the municipal sludge and the gasified slag, and realizes resource recycling of the sludge and the gasified slag; the high-pressure stepping filter cloth dehydrator is characterized in that a coaming lifting control mechanism and a pressing oil cylinder are sequentially controlled to act on a dehydration station to enable the bottom plane of a coaming frame to compact and firmly abut against lower-layer upper filter cloth of upper-layer filter cloth and lower-layer upper filter cloth of lower-layer filter cloth to realize sealing, then a pressing plate moves downwards to realize extrusion of mixed sludge wrapped by the upper-layer filter cloth and the lower-layer upper filter cloth of the lower-layer filter cloth and surrounded by a coaming frame, extruded water passes through the upper-layer filter cloth and the lower-layer upper filter cloth of the lower-layer filter cloth and is pumped and discharged by a negative pressure water pump through a negative pressure water discharge hole II of the pressing plate and a negative pressure water discharge hole I of the lower-layer bottom bearing plate, filter cakes formed after dehydration can leave the pressing plate and stay on the lower-layer upper filter cloth of the lower-layer filter cloth, and non-dehydrated mixed sludge enters the dehydration station from a feeding end of a lower-layer filter cloth assembly in a stepping control mode of controlling the forward movement of the lower-layer filter cloth, The filter cake after the dehydration is exported from the discharge end of lower floor's filter cloth subassembly, and the dehydration subassembly of exerting pressure can set up side by side to a plurality ofly in order to realize improving dehydration efficiency, perhaps realizes the better dehydration effect of multistage dehydration operation along the preceding back direction of delivery of filter cloth subassembly, can guarantee that the mixed sludge after the homogeneous mixing high pressure dehydration moisture content control is below 40% to do benefit to subsequent moderate temperature pyrolysis carbonization and the mummification of gasification sediment component.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic diagram of the overall three-dimensional structure of the high-pressure step-by-step cloth dehydrator of the present invention;
FIG. 3 is a front view of the high pressure step filter cloth dehydrator of the present invention;
fig. 4 is a schematic three-dimensional view of a press dewatering assembly of the high pressure step-by-step cloth filter press of the present invention (for ease of illustration, the bounding wall frame is not shown).
In the figure: 1. the device comprises a filter cloth assembly, 11, an upper filter cloth assembly, 111, upper filter cloth, 112, an upper filter cloth tensioning mechanism, 12, a lower filter cloth assembly, 121, lower filter cloth, 122, a filter cloth driving roller, 123, a lower filter cloth tensioning mechanism, 124, a supporting roller way, 2, a pressing dewatering assembly, 21, a supporting frame, 211, an upper counter-force beam, 212, a lower pressure-bearing bottom supporting plate, 22, a coaming frame, 221, a coaming lifting control mechanism, 23, a pressing plate, 231 and a pressing oil cylinder.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the method for the synergistic treatment of municipal sludge and gasified slag specifically comprises the following steps:
uniformly mixing the gasified slag and the municipal sludge, wherein the mass percentage of the gasified slag to the municipal sludge is as follows: the content of the gasification slag is 10-50%, and the balance is municipal sludge.
And step two, sending the uniformly mixed sludge into a high-pressure stepping filter cloth dehydrator for high-pressure dehydration, wherein the dehydration pressure is 2-10 Mpa.
And step three, feeding the mixed sludge filter cake generated after high-pressure dehydration into a pyrolysis carbonizer for medium-temperature pyrolysis carbonization of municipal sludge components, igniting pyrolysis combustible gas generated by the medium-temperature pyrolysis carbonization, and acting on the mixed sludge filter cake as a heat source to dry the gasification slag components, wherein the pyrolysis temperature is 400-600 ℃, and the pyrolysis time is 0.5-1 h.
And step four, reusing the medium-temperature pyrolysis residue containing the dried gasification slag component in the aspects of building materials, roads, filling and the like.
Specific examples are shown in the following table:
as shown in fig. 2 and 3, the high-pressure step-by-step filter cloth dehydrator in step two includes a filter cloth assembly 1 and a pressing dehydration assembly 2 (hereinafter, the conveying direction of the mixed sludge is described as the front);
the filter cloth component 1 comprises an upper layer filter cloth component 11 and a lower layer filter cloth component 12; the lower layer filter cloth component 12 comprises lower layer filter cloth 121 which is connected end to form a closed loop structure and filter cloth driving rollers 122 which are arranged in the closed loop structure of the lower layer filter cloth in a supporting mode, the filter cloth driving rollers 122 which are arranged in a rolling mode along the front-rear direction are symmetrically arranged in two groups in the front-rear direction, the two groups of filter cloth driving rollers 122 integrally divide the lower layer filter cloth 121 of the closed loop structure into lower layer upper filter cloth and lower layer filter cloth, at least one group of filter cloth driving rollers 122 are provided with roller driving parts, the roller driving parts can be of a hydraulic motor structure or a motor structure and the like, preferably, the hydraulic motor structure is adopted, the filter cloth driving rollers 122 can be controlled to drive the lower layer filter cloth 121 to circularly move around the filter cloth driving rollers 122, the rear end of the lower layer filter cloth component 12 is a feeding end, and the front end is a discharging end; the upper filter cloth 111 of the upper filter cloth component 11 is correspondingly and parallelly erected above the lower filter cloth of the lower filter cloth 121;
the pressure-applying dehydration component 2 is erected above the filter cloth component 1, as shown in fig. 4, the pressure-applying dehydration component 2 comprises a support frame 21, a coaming frame 22 and a pressure-applying plate 23; the supporting frame 21 can be a floor mounting structure of a rigid portal frame or a suspension mounting structure of a rigid ceiling form, the supporting frame 21 comprises an upper reaction beam 211 positioned right above the upper-layer filter cloth 111 and a lower pressure-bearing bottom supporting plate 212 correspondingly arranged in parallel below the upper reaction beam 211, the lower pressure-bearing bottom supporting plate 212 is provided with a plurality of negative pressure drainage holes I penetrating through the top plane of the lower pressure-bearing bottom supporting plate 212, and the negative pressure drainage holes I are connected with a negative pressure water pump through pipelines; the coaming frame 22 is a cylinder-shaped structure which is arranged between the upper reaction beam 211 and the lower pressure-bearing bottom support plate 212 and is communicated up and down, the coaming frame 22 is connected with the upper reaction beam 211 through a coaming lifting control mechanism 221, the coaming lifting control mechanism 221 can be a telescopic cylinder structure such as a hydraulic cylinder, an air cylinder or an electric cylinder, and the like, and can also be a gear rack structure and other linear reciprocating motion structures which are arranged in a matching way, the control of the lifting of the coaming frame 22 can be realized by controlling the action of the coaming lifting control mechanism 221, and the upper filter cloth of the upper filter cloth 111 and the lower filter cloth 121 are both positioned between the lower pressure-bearing bottom support plate 212 and the coaming frame 22; the shape and size of the pressing plate 23 are matched with the shape and size of the inner cavity of the enclosing plate frame 22, the pressing plate 23 is arranged in the inner cavity of the enclosing plate frame 22 in a sliding fit mode, the pressing plate 23 is connected with the upper reaction beam 211 through the pressing oil cylinder 231 in an installing mode, the pressing plate 23 can be controlled to move up and down along the inner cavity of the enclosing plate frame 22 through controlling the stretching action of the pressing oil cylinder 231, a plurality of negative pressure drain holes II penetrating through the bottom plane of the pressing plate 23 are further formed in the pressing plate 23, and the negative pressure drain holes II are connected with a negative pressure water pump through pipelines.
When the uniformly mixed sludge is subjected to high-pressure dehydration in the second step, the feeding end of the lower filter cloth component 12 is in butt joint with the output end of the previous step, and the roller driving part and the negative pressure water pump are started, the mixed sludge falls onto the lower upper filter cloth of the lower filter cloth 121 and then is supported by the lower upper filter cloth of the lower filter cloth 121 to move forwards to enter the coverage range of the upper filter cloth 111, when the mixed sludge is conveyed to the position under the enclosing plate frame 22, the roller driving part is closed, the enclosing plate lifting control mechanism 221 and the pressing oil cylinder 231 are controlled to act successively, the bottom plane of the enclosing plate frame 22 compacts the lower filter cloth of the upper filter cloth 111 and the lower filter cloth 121 and stably abuts against the lower pressure-bearing bottom supporting plate 212 to realize sealing, then the pressing plate 23 moves downwards to realize the extrusion of the mixed sludge wrapped by the lower filter cloth of the upper filter cloth 111 and the lower filter cloth 121 and enclosed by the enclosing plate frame 22, the extruded water passes through the upper filter cloth 111 and the lower upper filter cloth of the lower filter cloth 121 and is pumped and discharged by a negative pressure water pump through a negative pressure water discharge hole II of the pressing plate 23 and a negative pressure water discharge hole I of the lower pressure-bearing bottom supporting plate 212, the pressing plate 23 moves downwards to a set distance or the pressing oil cylinder 231 reaches a set pressure to complete dehydration, the coaming lifting control mechanism 221 and the pressing oil cylinder 231 are controlled to act to lift the coaming frame 22 and the pressing plate 23, filter cakes formed by dehydrated solid wastes are separated from the pressing plate 23 under the action of self gravity and are retained on the lower upper filter cloth of the lower filter cloth 121 to complete a dehydration process, and then, the roller driving part is started again to enable the lower-layer upper filter cloth of the lower-layer filter cloth 121 to support the mixed sludge to move forward by one step pitch step by step, the dehydration operation is continued, the non-dehydrated mixed sludge enters a dehydration station from the feeding end of the lower-layer filter cloth component 12, and the dehydrated filter cake is output from the discharging end of the lower-layer filter cloth component 12.
In order to avoid space waste to the maximum extent, as a further improvement scheme of the invention, the cross section of the coaming frame 22 of the high-pressure step filter cloth dehydrator in the step two is a rectangular structure matched with the width of the upper layer filter cloth 111, the coaming frame 22 with the cuboid structure is convenient for the side-by-side close arrangement of the plurality of pressure-applying dehydration components 2, and the space waste can be further avoided to the maximum extent.
In order to improve the dewatering efficiency or realize multi-stage dewatering operation to improve the dewatering effect, as a further improvement of the present invention, in the second step, the pressing and dewatering components 2 of the high-pressure step-by-step filter cloth dewatering machine are arranged in parallel along the front and back conveying direction of the filter cloth component 1, and a plurality of supporting frames 21 share the same upper reaction beam 211, so that multi-stage dewatering can be realized by sequentially arranging the gradually increased set dewatering pressure of the pressing cylinders 231 from back to front. The supporting frames 21 can also share the same enclosing plate frame 22, and the pressing plates 23 are arranged in a butt joint mode along the front-back direction, so that the filter pressing treatment capacity of the primary dehydration process is increased.
In order to increase the stability of the lifting movement of the coaming frame 22 and avoid the phenomenon that the coaming frame 22 and the matched pressing plate 23 are blocked, as a further improvement scheme of the invention, the coaming frame 22 of the high-pressure step-type filter cloth dehydrator in the step two is installed and connected with the supporting frame 21 through a lifting guide mechanism, and the lifting guide mechanism can be a guide protrusion and guide groove structure which is arranged in a matched manner, and can also be other linear guide structures such as a guide wheel and guide rail structure which are arranged in a matched manner. Or the pressing plate 23 of the high-pressure stepping filter cloth dehydrator in the second step is connected with the enclosing plate frame 22 through a lifting guide mechanism, and the lifting guide mechanism can be a guide protrusion and guide groove structure which is arranged on the inner surface of the pressing plate 23 or the enclosing plate frame 22 in a matched mode.
In order to realize better sealing effect in the dehydration process, as a further improvement scheme of the invention, a sealing gasket is arranged on the bottom plane of the coaming frame 22 of the high-pressure stepping filter cloth dehydrator in the step two.
The municipal sludge and gasified slag co-processing method utilizes the characteristics of the gasified slag to mix with the municipal sludge so as to improve the sludge dehydration effect, does not need to add an additional chemical conditioner, does not generate harmful substances, saves the cost and has no pollution, not only can realize better dehydration performance and dehydration effect of the municipal sludge in the early stage, but also can realize effective drying treatment on the gasified slag in the later stage, can simultaneously realize energy consumption reduction, does not need additional input heat to dry the gasified slag, can solve the problems of high moisture and difficult dehydration of the municipal sludge and the gasified slag, and realizes the resource recycling of the sludge and the gasified slag; the high-pressure stepping filter cloth dehydrator can ensure that the water content of the uniformly mixed sludge after high-pressure dehydration is controlled below 40 percent, so as to be beneficial to subsequent medium-temperature pyrolysis carbonization and drying of gasified slag components.
Claims (10)
1. The municipal sludge and gasified slag co-processing method is characterized by comprising the following steps:
uniformly mixing the gasified slag and the municipal sludge, wherein the mass percentage of the gasified slag to the municipal sludge is as follows: the gasification slag content is 10-50%, and the balance is municipal sludge;
step two, sending the uniformly mixed sludge into a high-pressure stepping filter cloth dehydrator for high-pressure dehydration, wherein the dehydration pressure is 2-10 Mpa;
feeding the mixed sludge filter cake generated after high-pressure dehydration into a pyrolysis carbonizer for medium-temperature pyrolysis carbonization of municipal sludge components, igniting pyrolysis combustible gas generated by the medium-temperature pyrolysis carbonization, and then acting on the mixed sludge filter cake as a heat source to dry the gasification slag components, wherein the pyrolysis temperature is 400-600 ℃, and the pyrolysis time is 0.5-1 h;
and step four, recycling the medium-temperature pyrolysis residues containing the dried gasification slag components.
2. The municipal sludge and gasified slag co-processing method according to claim 1, wherein the mass percentages of the gasified slag and the municipal sludge in the first step are as follows: the gasification slag content is 10 percent, and the rest is municipal sludge; in the second step, the dehydration pressure is 10 Mpa; in the third step, the pyrolysis temperature is 600 ℃, and the pyrolysis time is 0.5 h.
3. The municipal sludge and gasified slag co-processing method according to claim 1, wherein the mass percentages of the gasified slag and the municipal sludge in the first step are as follows: the gasification slag content is 25 percent, and the rest is municipal sludge; in the second step, the dehydration pressure is 8 Mpa; in the third step, the pyrolysis temperature is 560 ℃, and the pyrolysis time is 0.6 h.
4. The municipal sludge and gasified slag co-processing method according to claim 1, wherein the mass percentages of the gasified slag and the municipal sludge in the first step are as follows: the gasification slag content is 35 percent, and the rest is municipal sludge; in the second step, the dehydration pressure is 5 Mpa; in the third step, the pyrolysis temperature is 500 ℃, and the pyrolysis time is 0.8 h.
5. The municipal sludge and gasified slag co-processing method according to claim 1, wherein the mass percentages of the gasified slag and the municipal sludge in the first step are as follows: the gasification slag content is 50%, and the rest is municipal sludge; in the second step, the dehydration pressure is 2 Mpa; in the third step, the pyrolysis temperature is 400 ℃, and the pyrolysis time is 1 h.
6. The municipal sludge and gasified slag co-processing method according to any one of claims 1 to 5, wherein the high-pressure step-by-step cloth filter dehydrator in the second step comprises a cloth filter assembly (1) and a pressure-applying dehydration assembly (2);
the filter cloth component (1) comprises an upper layer filter cloth component (11) and a lower layer filter cloth component (12); the lower-layer filter cloth component (12) comprises lower-layer filter cloth (121) which is connected end to end and is in a closed-loop structure and filter cloth driving rollers (122) which are arranged in the closed-loop structure of the lower-layer filter cloth in a supporting mode, the lower-layer filter cloth (121) in the closed-loop structure is integrally divided into lower-layer upper filter cloth and lower-layer lower filter cloth by two groups of filter cloth driving rollers (122), at least one group of filter cloth driving rollers (122) is provided with a roller driving part, the rear end of the lower-layer filter cloth component (12) is a feeding end, and the front end of the lower-layer filter cloth component (12) is a discharging end; the upper filter cloth (111) of the upper filter cloth component (11) is erected above the lower-layer upper filter cloth of the lower-layer filter cloth (121) correspondingly and parallelly;
the pressure-applying dehydration component (2) is erected and installed above the filter cloth component (1) and comprises a support frame (21), a surrounding plate frame (22) and a pressure-applying plate (23); the supporting frame (21) comprises an upper reaction beam (211) positioned right above the upper-layer filter cloth (111) and a lower pressure-bearing bottom supporting plate (212) correspondingly arranged below the upper reaction beam (211) in parallel, a plurality of negative pressure water drainage holes I penetrating through the top plane of the lower pressure-bearing bottom supporting plate (212) are formed in the lower pressure-bearing bottom supporting plate (212), and the negative pressure water drainage holes I are connected with a negative pressure water pump through pipelines; a surrounding plate frame (22) which is vertically penetrated and has a cylindrical structure is arranged between an upper counter-force beam (211) and a lower pressure-bearing bottom support plate (212), the surrounding plate frame (22) is connected with the upper counter-force beam (211) through a surrounding plate lifting control mechanism (221), and upper filter cloth of an upper layer of filter cloth (111) and a lower layer of filter cloth (121) and upper filter cloth of a lower layer are positioned between the lower pressure-bearing bottom support plate (212) and the surrounding plate frame (22); the pressing plate (23) matched with the shape and size of the inner cavity of the enclosure frame (22) is arranged in the inner cavity of the enclosure frame (22) in a sliding fit manner, the pressing plate (23) is connected with the upper counter-force beam (211) through a pressing oil cylinder (231), a plurality of negative-pressure water drainage holes II penetrating through the bottom plane of the pressing plate (23) are further formed in the pressing plate (23), and the negative-pressure water drainage holes II are connected with a negative-pressure water pump through pipelines;
7. the municipal sludge and gasified slag co-processing method according to claim 6, wherein the cross section of the enclosure frame (22) of the high-pressure step-by-step filter cloth dehydrator is a rectangular structure matched with the width dimension of the upper filter cloth (111).
8. The municipal sludge and gasified slag co-processing method according to claim 7, wherein the plurality of pressure-applying dehydration modules (2) of the high-pressure step-by-step filter cloth dehydrator are arranged side by side along the front-rear conveying direction of the filter cloth module (1).
9. The municipal sludge and gasified slag co-processing method according to claim 8, wherein in step two, the plurality of support frames (21) of the high-pressure step-by-step filter cloth dehydrator share the same upper reaction beam (211), and/or the plurality of support frames (21) of the high-pressure step-by-step filter cloth dehydrator share the same enclosure frame (22), and the plurality of pressing plates (23) are butted in the front-back direction.
10. The municipal sludge and gasified slag co-processing method according to claim 6, wherein a bounding wall frame (22) of the high-pressure step-by-step filter cloth dehydrator is mounted and connected with the support frame (21) through a lifting guide mechanism, or a pressure plate (23) of the high-pressure step-by-step filter cloth dehydrator is mounted and connected with the bounding wall frame (22) through a lifting guide mechanism.
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