CN211570422U - System for adopt self-propagating pyrolysis device to handle mud in coordination with cement plant or garbage power plant - Google Patents

Abstract

The utility model relates to the field of solid waste treatment, in particular to a system for treating sludge by adopting a self-propagating pyrolysis device in cooperation with a cement plant or a garbage power plant, which comprises a pretreatment system and the self-propagating pyrolysis device, wherein the pretreatment system sequentially comprises a material storage bin, a metering device and a mixing device which are connected through a material conveying device, and the mixing device is also connected with a material distributor through the material conveying device; the self-propagating pyrolysis device is a stepping or chain belt type self-propagating pyrolysis device, and the smoke in the cooling section of the self-propagating pyrolysis device enters a decomposing furnace of a cement plant or enters a primary/secondary air supply system of a garbage power plant. The system can effectively combine the existing cement plant or garbage power plant to realize the treatment of the domestic sludge, and does not influence the working condition of the cement plant or garbage power plant, and the cost of the cement kiln is low.

Description

System for adopt self-propagating pyrolysis device to handle mud in coordination with cement plant or garbage power plant

Technical Field

The utility model relates to a solid waste handles the field, concretely relates to from system of stretching pyrolysis device treatment mud.

Background

Along with the increasing urban population and the improvement of domestic sewage treatment rate, the production amount of municipal sewage and sludge is increased, so that the environmental pollution of the municipal sludge becomes the focus of attention of the majority of citizens. Municipal sludge is an extremely complex heterogeneous body consisting of organic residues, bacterial thalli, inorganic particles, colloids and the like, contains a large amount of pathogenic bacteria, parasites (eggs), and toxic and harmful substances such as partial heavy metals, salts and the like, and also contains high attached water and bound water. Although the sewage treatment plant adopts the vacuum filtration or centrifugal dehydration and the like for dehydration, the water content of the sludge is still as high as 80 percent. Due to the physicochemical properties of sludge, thorough harmless disposal of sludge is extremely difficult, and has become a worldwide problem today. The existing disposal methods such as landfill and agriculture have high environmental risks, and extremely high cost is required for truly achieving thorough harmless disposal.

Along with the continuous development of the urban domestic garbage incineration industry, garbage incineration plants are built in all domestic large cities, and a project of directly mixing and incinerating domestic sludge in the domestic garbage appears in some places, but the working condition in the incinerator can be influenced due to the fact that the domestic sludge has high water content and low heat value, more importantly, the domestic sludge and the garbage are mixed and incinerated to generate a large amount of dust, and the amount of fly ash generated by a flue gas purification system is obviously increased. According to the regulations of national hazardous waste lists, the waste fly ash belongs to hazardous waste, so that the disposal cost of the fly ash and the risk of fly ash management are increased by the cooperative disposal of domestic sludge in the waste incineration power plant; in addition, in recent years, the landfill land is increasingly tense, so that the mode of burning the sludge by mixing the garbage is greatly limited.

The cement kiln treatment has the obvious advantages of high treatment temperature, large incineration space, long incineration residence time, large treatment scale, no secondary slag discharge problem and the like, and the municipal domestic sludge is treated by adopting a cement kiln synergistic mode at home at present. However, since the initial water content of the domestic sludge is as high as 80%, the sludge needs to be dehydrated before the domestic sludge is cooperatively treated by the cement kiln, the domestic sludge can be dehydrated to a certain degree in a sewage plant and then conveyed to a cement plant, a drying line can also be established in the cement plant, the sludge with the water content of 80% is dried and then enters a cement production line for treatment, the addition of the sludge can have certain influence on the production of the cement, the drying line is increased, and the modification cost of the cement plant is increased. Therefore, the cement plant industry is not willing to accept and process the domestic sludge, and the cooperative treatment of the domestic sludge by using the cement kiln is a very effective mode, so the contradiction between the two needs to be solved.

Disclosure of Invention

The cement plant has the obvious advantages of high treatment temperature, large incineration space, long incineration residence time, large treatment scale, no secondary slag discharge problem and the like; solve the problem of the transformation expense that domestic sludge high moisture content brought the cement plant and influence with production simultaneously, the utility model provides a system that cement plant or garbage power factory adopt from stretching pyrolysis device processing mud in coordination, this system can effectively combine current cement plant to realize the processing to domestic sludge, and does not influence the operating mode of cement plant or msw incineration, also can not produce a large amount of flying ashes simultaneously, and the cement kiln transformation expense is low.

The technical scheme of the utility model as follows:

the system for treating the sludge by adopting the self-propagating pyrolysis device in cooperation with a cement plant or a garbage power plant comprises a pretreatment system and the self-propagating pyrolysis device, wherein the pretreatment system sequentially comprises a material storage bin, a metering device and a mixing device which are connected through a material conveying device, and the mixing device is also connected with a material distributor through the material conveying device; the self-propagating pyrolysis device is a stepping or chain belt type self-propagating pyrolysis device, the stepping self-propagating pyrolysis device comprises an incineration rack, a trolley capable of moving horizontally on the incineration rack and a driving device for driving the trolley to move horizontally, a distributor and an upper shell are sequentially distributed above the incineration rack, the upper shell is sequentially divided into a preheating section, an ignition section, a pyrolysis section and a cooling section, and a waste heat flue gas inlet is distributed on the preheating section; a plurality of air draft hoods are distributed at positions corresponding to the ignition section, the pyrolysis section and the cooling section below the incineration rack, an air draft pipeline is connected below the air draft hoods, fans are distributed on the air draft pipeline, and the air draft hoods, the fans and the air draft pipeline are communicated to form a smoke passage; in the flue gas passageway, the flue gas of ignition section gets into the pyrolysis section, and the flue gas of pyrolysis section forms one-level or multistage circulation in the pyrolysis section, and the last one-level flue gas of pyrolysis section gets into the cooling zone, and the flue gas of cooling zone gets into the decomposing furnace of cement plant or gets into the primary/secondary air supply system of rubbish power plant.

The self-propagating pyrolysis device comprises a chain belt conveyor, wherein the chain belt conveyor consists of a driving mechanism, a chain wheel and a chain belt matched with the chain wheel; a distributing device and an upper shell are sequentially arranged above the head of the chain belt conveyor along the advancing direction of the chain belt; the upper shell seals the space above the chain belt and is sequentially divided into a preheating section, an ignition section, a pyrolysis section and a cooling section; the preheating section is provided with a waste heat flue gas inlet, a plurality of air draft hoods are arranged below a cavity formed by matching the chain belt with the ignition section, the pyrolysis section and the cooling section, an air draft pipeline is connected below the air draft hoods, a fan is arranged on the air draft pipeline, and the air draft hoods, the fan and the air draft pipeline are communicated to form a flue gas passage; in the flue gas passageway, the flue gas of ignition section gets into the pyrolysis section, and the flue gas of pyrolysis section forms one-level or multistage circulation in the pyrolysis section, and the last one-level flue gas of pyrolysis section gets into the cooling zone, and the flue gas of cooling zone gets into the decomposing furnace of cement plant or gets into the primary/secondary air supply system of rubbish power plant.

Preferably, a tail seal is arranged above the tail of the belt conveyor, a finished product bin is distributed below the tail of the belt conveyor, and the tail seal is in seal fit with the finished product bin.

Sludge ash falls into the finished product bin naturally, and the raised dust caused by the falling of the product is sealed by the tail of the machine, so that the working environment is not polluted.

Preferably, a dust removal device is arranged above the tail seal.

The dust removing equipment can remove dust caused by the falling of sludge ash.

Preferably, a residue bin is arranged below the chain belt conveyor, one end of the residue bin is matched with the finished product bin, and the other end of the residue bin extends to the position below the distributing device and is matched with a return chain belt (the return chain refers to a part of the chain belt which is located below the chain wheel and is conveyed back).

The beneficial effects of the utility model reside in that:

the utility model discloses an adopt and handle mud in coordination with the cement plant from stretching pyrolysis device, can effectively detach the organic matter of mud, microorganism and difficult degradation organic matter, when in coordination with the cement plant, avoided in the cement raw materials directly to dope the influence to the production cement operating mode that mud burns and cause, the mud lime-ash directly produces cement product as cement clinker, do not produce the secondary waste residue, when coordinating with the garbage power plant, the flying dust that directly dopes the mud burning and cause in the rubbish effectively pollutes and burns the influence of operating mode to the rubbish. The flue gas pyrolysis section generated by the pyrolysis section of the self-propagating pyrolysis device of the utility model reduces pollutants in the flue gas as much as possible through multi-stage combustion, meanwhile, the flue gas in the pyrolysis section is introduced into the decomposing furnace of the cement plant after passing through the cooling section, and then the flue gas enters the flue gas purification system of the cement plant along with the flue gas of the decomposing furnace, thereby realizing clean incineration of sludge; or enters a primary/secondary air supply system of the garbage power plant to preheat the garbage, so that the resource recycling is realized, and meanwhile, the flue gas enters a flue gas purification system of the garbage power plant along with the flue gas generated by the garbage incineration, so that the clean incineration of the sludge is realized.

The utility model provides a from stretching pyrolysis device is vertical structure, area is little, and with garbage power plant or cement plant sharing gas cleaning system and lime-ash storage pit, make the area from stretching pyrolysis device littleer, make its especially be applicable to the improvement to current garbage power plant, need not to enlarge under the condition of area, use in combination with former power plant or cement plant, can also clean this difficult problem of efficient processing mud when handling rubbish, the address selection difficult problem that the mud burned also can be solved simultaneously.

Drawings

FIG. 1 is a schematic diagram of a self-propagating pyrolysis system;

FIG. 2 is a schematic structural diagram of a step-wise self-propagating pyrolysis system;

FIG. 3 is a schematic structural diagram of a chain belt type self-propagating pyrolysis system.

FIG. 4 is a schematic diagram of a self-propagating pyrolysis unit in conjunction with a cement plant for treating sludge;

FIG. 5 is a schematic view of a self-propagating pyrolysis unit in conjunction with a waste power plant for treating sludge;

in the figure, 1-a pretreatment system, 11-a material conveying device, 12-a material storage bin, 121-a sludge storage bin, 122-a green auxiliary material storage bin, 13-a metering device, 14-a material mixing device, 2-a self-propagating pyrolysis device, 21-an incinerator frame, 22-a trolley, 23-a distributor, 24-an upper shell, 241-a preheating section, 2411-a waste heat flue gas inlet, 242-an ignition section, 243-a pyrolysis section, 244-a cooling section, 25-an air draft cover, 26-an air draft pipeline, 27-a fan, 28-a chain belt conveyor, 281-a chain wheel, 282-a chain belt, 283-a tail seal, 284-a finished product bin, 285-a dust removal device and 256-a residue bin.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

Example 1, self-propagating pyrolysis system:

referring to fig. 1 and 2, the self-propagating pyrolysis system comprises a pretreatment system 1 and a self-propagating pyrolysis device 2, wherein the pretreatment system 1 sequentially comprises a material storage bin 12, a metering device 13 and a mixing device 14 which are connected through a material conveying device 11, the mixing device 14 is also connected with a material distributor 23 through the material conveying device 11, and the material storage bin 12 comprises a sludge storage bin 121 and a green auxiliary material storage bin 122; the self-propagating pyrolysis device 2 is a stepping self-propagating pyrolysis device, and referring to fig. 3, the stepping self-propagating pyrolysis device comprises a pyrolysis rack 21, a trolley 22 which is horizontally movable on the pyrolysis rack 21, and a driving device which drives the trolley 22 to horizontally move, a distributor 23 and an upper shell 24 are sequentially distributed above the pyrolysis rack 21, the upper shell 24 is sequentially divided into a preheating section 241, an ignition section 242, a pyrolysis section 243, and a cooling section 244, and a waste heat flue gas inlet 2411 is distributed on the preheating section 241; a plurality of air draft hoods 25 are distributed below the pyrolysis rack 21 and at positions corresponding to the ignition section 242, the pyrolysis section 243 and the cooling section 244, an air draft pipeline 26 is connected below the air draft hoods 25, a fan 27 is distributed on the air draft pipeline 26, and the air draft hoods 25, the fan 27 and the air draft pipeline 26 are communicated to form a smoke passage; in the flue gas passage, the flue gas of the ignition section 242 enters the pyrolysis section 243, the flue gas of the pyrolysis section 243 forms one-stage or multi-stage circulation in the pyrolysis section 243, the flue gas of the last stage of the pyrolysis section 243 enters the cooling section 244, and the flue gas of the cooling section enters the decomposing furnace of the cement plant.

Referring to fig. 3, the self-propagating pyrolysis device 2 is a belt-type self-propagating pyrolysis device comprising a belt conveyor 28 composed of a driving mechanism, a sprocket 281, and a chain belt 282 cooperating with the sprocket 281; a distributor 23 and an upper shell 24 are sequentially arranged above the head of the chain belt conveyor 28 along the advancing direction of the chain belt 282; the upper case 24 seals the space above the chain belt 282 and is sequentially divided into a preheating section 241, an ignition section 242, a pyrolysis section 243 and a cooling section 244; a waste heat flue gas inlet 2411 is distributed on the preheating section 241, a plurality of air draft covers 25 are distributed below a cavity formed by matching the chain belt 282 with the ignition section 242, the pyrolysis section 243 and the cooling section 244, an air draft pipeline 26 is connected below the air draft covers 25, a fan 27 is distributed on the air draft pipeline 26, and the air draft covers 25, the fan 27 and the air draft pipeline 26 are communicated to form a flue gas passage; in the flue gas passage, the flue gas of the ignition section enters the pyrolysis section 243, the flue gas of the pyrolysis section 243 forms one-stage or multi-stage circulation in the pyrolysis section 243, the flue gas of the last stage of the pyrolysis section 243 enters the cooling section 244, and the flue gas of the cooling section 244 enters the decomposing furnace of the cement plant. A tail seal 283 is arranged above the tail of the chain belt conveyor 28, a finished product bin 284 is arranged below the tail of the chain belt conveyor 28, the tail seal 283 is in sealing fit with the finished product bin 284, sludge ash naturally falls into the finished product bin 284, and dust caused by falling of products is sealed by the tail seal 283, so that the working environment is not polluted; a dust removing device 285 is arranged above the tail seal 283, the dust removing device 285 can remove dust caused by the falling of sludge ash, a residue bin 286 is arranged below the chain belt conveyor 28, one end of the residue bin 286 is matched with the finished product bin 284, and the other end of the residue bin 286 extends to the lower part of the distributing device 23 and is matched with a return chain belt 282 (the return chain refers to a part of the chain belt which is positioned below the chain wheel and is conveyed back).

Example 2:

with reference to the system described in example 1, the system is used in cooperation with a cement plant to treat sludge, and a formed system is shown in fig. 4, wherein flue gas in a cooling section of the system enters a decomposing furnace of the cement plant, and the cooperation treatment method comprises the following steps:

(1) pretreatment: the green auxiliary materials and the sludge in the material storage bin 12 are weighed by a metering device, conveyed into a mixing device 14 according to the proportion of 1:5, and then uniformly mixed to form a mixed material, wherein the particle size of the green auxiliary materials is 2-30 mm.

(2) Pyrolysis of a stepping/chain belt type self-propagating pyrolysis device: the mixed material is conveyed to a distributing device 23, the distributing device 23 arranges the mixed material on a trolley 22 or a chain belt 282 below the distributing device 23 to form a material layer, the material layer is sequentially introduced into a preheating section 241, an ignition section 242, a pyrolysis section 243 and a cooling section 244, the material layer is preheated and dried by waste heat flue gas of a garbage power plant in the preheating section 241, then the material layer enters an ignition section 242, the sludge is ignited by gas combustion, incompletely combusted smoke generated by ignition is pumped into a pyrolysis section 243 for secondary or multistage combustion, after the material layer is ignited, the material layer starts self-propagating combustion, then enters the pyrolysis section 243, organic matters, microorganisms and organic matters in the material layer are pyrolyzed to form gaseous compounds, and the gaseous compounds are also pumped into the lower stage pyrolysis section 243 along with the flue gas to be pyrolyzed for multiple times, then the cooled flue gas enters a decomposing furnace of the cement kiln, the material layer is cooled to form sludge ash, and the sludge ash is used as cement clinker to enter a cement clinker system.

Example 3:

with reference to the system described in embodiment 1, the flue gas in the cooling section enters the primary/secondary air supply system of the waste power plant, and cooperates with the waste power plant to treat the sludge, as shown in fig. 5, the treatment method is as follows:

(1) pretreatment: weighing green auxiliary materials and sludge in a material storage bin 12 through a metering device, conveying the green auxiliary materials and the sludge into a mixing device 14 according to a ratio of 1:5, and then uniformly mixing to form a mixed material, wherein the particle size of the green auxiliary materials is 2-30 mm;

(2) pyrolysis of a stepping/chain belt type self-propagating pyrolysis device: the mixed material is conveyed to a distributing device 23, the distributing device 23 arranges the mixed material on a trolley 22 or a chain belt 282 below the distributing device 23 to form a material layer, the material layer is sequentially introduced into a preheating section 241, an ignition section 242, a pyrolysis section 243 and a cooling section 244, the material layer is preheated and dried by waste heat smoke of a garbage power plant and then enters the ignition section 242, the sludge is ignited by gas combustion, incompletely combusted smoke generated by ignition is pumped into the pyrolysis section 243 to be subjected to two-stage or multi-stage combustion, after the material layer is ignited, the material layer starts to self-propagate combustion and then enters the pyrolysis section 243, organic matters, microorganisms and organic matters in the material layer are pyrolyzed to form gas compounds, the gas compounds are pumped into a lower-stage pyrolysis section 243 to be pyrolyzed for multiple times along with the smoke, then enter a smoke purification system of the garbage power plant along with the cooling smoke, sludge ash is formed after the material layer is cooled, and the sludge ash can be directly, is treated together with garbage ash.

The system of example 2 and example 3 can be used to treat sludge with a water content of up to 80% without adding a dewatering agent, a flocculating agent, etc., or without dewatering by a dewatering device.

The indexes of sludge ash generated by the treatment system are detected, the ash can reach the following standard, the moisture content of the ash is less than 1%, and the loss on ignition is less than or equal to 50%. The residual contaminant concentrations are given in table 1 and the hygiene indicators in table 2.

TABLE 1 ash contaminants concentrations

Serial number	Control item	Limit value/(mg/kg residue)
			1	Total cadmium	＜20
2	Total mercury	＜5
			3	Total lead	＜300
4	Total chromium	＜1000
			5	Total arsenic	＜75
6	Total nickel	＜200
			7	Total zinc	＜4000
8	Total copper	＜1500

TABLE 2 hygiene index

Serial number	Control item	Limit value
			1	Faecal coliform bacteria count	<0.01
2	Death rate of ascarid eggs	＞95％

Claims (5)

1. The system for treating the sludge by adopting the self-propagating pyrolysis device in cooperation with a cement plant or a garbage power plant is characterized by comprising a pretreatment system (1) and the self-propagating pyrolysis device (2), wherein the pretreatment system (1) sequentially comprises a material storage bin (12), a metering device (13) and a material mixing device (14) which are connected through a material conveying device (11), the material mixing device (14) is also connected with a material distributor (23) through the material conveying device (11), and the material storage bin (12) comprises a sludge storage bin (121) and a green auxiliary material storage bin (122); self-propagating pyrolysis device (2) is marching type self-propagating pyrolysis device, but marching type self-propagating pyrolysis device includes pyrolysis frame (21), pyrolysis frame (21) go up horizontal migration's platform truck (22) and drive platform truck (22) horizontal motion's drive arrangement, pyrolysis frame (21) top has distributed distributing device (23) and upper casing (24) in proper order, and upper casing (24) divide into preheating section (241), ignition section (242), pyrolysis section (243) and cooling zone (244) in proper order, it has waste heat flue gas inlet (2411) to distribute on preheating section (241), and pyrolysis frame (21) below and ignition section (242), pyrolysis section (243) and cooling zone (244) correspond the position and have a plurality of suction hoods (25) to distribute, and suction hood (25) below even has air draft pipeline (26), and last cloth of air draft pipeline (26) has fan (27), and suction hood (25), The fan (27) is communicated with the air suction pipeline (26) to form a smoke passage; in the flue gas passage, the flue gas of the ignition section (242) enters the pyrolysis section (243), the flue gas of the pyrolysis section (243) forms one-stage or multi-stage circulation in the pyrolysis section (243), the last stage flue gas of the pyrolysis section (243) enters the cooling section (244), and the flue gas of the cooling section (244) enters a decomposing furnace of a cement plant or enters a primary/secondary air supply system of a garbage power plant.

2. The system for treating the sludge by adopting the self-propagating pyrolysis device in cooperation with a cement plant or a garbage power plant is characterized by comprising a pretreatment system (1) and the self-propagating pyrolysis device (2), wherein the pretreatment system (1) sequentially comprises a material storage bin (12), a metering device (13) and a material mixing device (14) which are connected through a material conveying device (11), the material mixing device (14) is also connected with a material distributor (23) through the material conveying device (11), and the material storage bin (12) comprises a sludge storage bin (121) and a green auxiliary material storage bin (122); the self-propagating pyrolysis device (2) is a chain belt conveyor (28), and the chain belt conveyor (28) consists of a driving mechanism, a chain wheel (281) and a chain belt (282) matched with the chain wheel (281); a distributing device (23) and an upper shell (24) are sequentially arranged above the head of the chain belt type conveyor (28) along the chain belt advancing direction; the upper shell (24) seals the space above the chain belt (282) and is sequentially divided into a preheating section (241), an ignition section (242), a pyrolysis section (243) and a cooling section (244); a waste heat flue gas inlet (2411) is formed in the preheating section (241), a plurality of air draft hoods (25) are arranged below a cavity formed by matching the chain belt (282) with the ignition section (242), the pyrolysis section (243) and the cooling section (244), an air draft pipeline (26) is connected below each air draft hood (25), a fan (27) is arranged on each air draft pipeline (26), and the air draft hoods (25), the fan (27) and the air draft pipeline (26) are communicated to form a flue gas passage; in the flue gas passage, the flue gas of the ignition section (242) enters the pyrolysis section (243), the flue gas of the pyrolysis section (243) forms one-stage or multi-stage circulation in the pyrolysis section (243), the last stage flue gas of the pyrolysis section (243) enters the cooling section (244), and the flue gas of the cooling section (244) enters a decomposing furnace of a cement plant or enters a primary/secondary air supply system of a garbage power plant.

3. The system of claim 2, characterized in that a tail seal (283) is arranged above the tail of the chain belt conveyor (28), a finished product bin (284) is arranged below the tail of the chain belt conveyor (28), and the tail seal (283) is in sealing fit with the finished product bin (284).

4. A system according to claim 3, characterized in that a dust removing device (285) is arranged above the tail seal (283).

5. The system according to claim 4, characterized in that a residue bin (286) is arranged below the chain conveyor (28), one end of the residue bin (286) is matched with the finished product bin (284), and the other end of the residue bin (286) extends to below the distributor (23) and is matched with the return chain belt.

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