CN210176803U - Solid waste gasification melting system - Google Patents
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- CN210176803U CN210176803U CN201920957830.1U CN201920957830U CN210176803U CN 210176803 U CN210176803 U CN 210176803U CN 201920957830 U CN201920957830 U CN 201920957830U CN 210176803 U CN210176803 U CN 210176803U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The utility model discloses a solid useless rubbish gasification melting system belongs to the environmental protection technology field, including the solid useless rubbish feed unit, circulating fluidized bed gasification unit, entrained flow bed gasification melting unit, waste heat recovery and dust removal unit and the gasification gas purification unit that connect gradually, waste heat recovery and dust removal unit are including the gasification agent pre-heater, exhaust-heat boiler, dust remover and the gas cooler that connect gradually, the dust remover bottom is connected with flying dust circulating line, be equipped with the material returning unit on the flying dust circulating line, circulating fluidized bed gasification unit includes circulating fluidized bed gasifier and circulating fluidized bed gas-solid separation ware, the material returning unit with circulating fluidized bed gasifier's material returning opening is connected. The utility model discloses can realize the large-scale industrial processing scale of solid useless rubbish, overcome the energy consumption height that current solid useless refuse treatment method exists, the thermal efficiency is low, gasification efficiency is low, raw materials adaptability is poor, ash innocent treatment is not thorough, easily press from both sides the problem that has harmful substance in the flue gas.
Description
Technical Field
The utility model relates to a solid useless rubbish gasification melting system belongs to environmental protection technology field.
Background
With the implementation of increasingly stringent environmental protection policies and regulations, how to realize the treatment goals of reduction, reclamation and harmlessness of industrial solid wastes generated in the industries of oil refining, chemical industry, metallurgy, paper making, printing and dyeing and the like and domestic wastes or solid wastes generated by social residents is an important research content in the environmental protection technology field in recent years.
The traditional solid waste garbage treatment method comprises a landfill method and a burning method. The landfill method is easy to cause secondary pollution to underground water and soil due to large occupied area, cannot realize the reduction, recycling and harmless treatment targets of solid waste garbage, and is gradually eliminated. The incineration method has high requirement on the heat value of solid waste garbage, and incomplete incineration is easily caused due to lower heat value or unstable heat value, so that strong carcinogens such as dioxin are generated; the residues after incineration still need further treatment, especially for dangerous solid wastes, the residues after incineration still belong to dangerous wastes generally, can not reach the goal of thorough harmless treatment, and the traditional solid waste incineration method is not adopted more and more.
The high-temperature melting method is the development direction of the solid waste treatment technology and has a great prospect. The high-temperature melting method is that the combustible components in the solid waste are gasified at high temperature by heating the solid waste to a temperature above the melting point of the solid waste, and the generated flue gas or gasified gas can be further recycled to realize resource treatment; the solid waste residues form a molten liquid state, and then are rapidly cooled to form solid glass bodies with amorphous structures, which can be used as building materials, so that harmless treatment is thoroughly realized. The heating of solid waste to make it melt at high temperature mainly includes three modes of resistance type melting, plasma melting and gasification melting. The resistance-type melting method is characterized in that resistance is generated inside solid waste through an electrode, the solid waste is heated by joule heat to be melted, the melting temperature of the method is 1200-1600 ℃, solid waste slag glass bodies can be formed, harmless treatment is realized, and heat byproduct steam of high-temperature flue gas can be recycled, but the method has high electrode consumption, high energy consumption and high solid waste treatment cost; the plasma melting method is to heat the surface of the solid waste garbage by using a plasma torch to melt the solid waste garbageThe method has the advantages that the electrode consumption is slightly lower than that of a resistance type melting method, but the heat loss is large, the energy consumption is high, the service life of a plasma torch is limited, and the large-scale industrial treatment scale is difficult to form. The gasification melting method is that solid waste garbage is subjected to high-temperature oxidation reduction gasification reaction in a gasification furnace by utilizing a gasification agent, the reaction temperature is 1200-1600 ℃, solid waste slag is melted and then cooled and solidified to form a vitreous body, and high-temperature gasification gas components generated by the reaction are CO and H2Mainly, the method can be used as chemical synthesis gas or fuel gas besides recovering heat through byproduct steam, has low energy consumption and high heat efficiency, is successfully applied in the technical field of coal gasification based on a gasification reaction technical mechanism, and has a large-scale industrialized prospect in the solid waste treatment industry.
Chinese utility model patent application No. 201711221720.0, publication No. CN107957069B, publication No. 2019-06-04 disclose a waste pyrolysis gasification system. The garbage pyrolysis gasification system comprises a pyrolysis gasification furnace, a pyrolysis gas combustion chamber, a dust removal unit, a deacidification unit, a chimney and a waste heat recycling unit, wherein an outlet at the lower end of the pyrolysis gasification furnace is communicated with an air inlet of the pyrolysis gas combustion chamber, and the pyrolysis gasification furnace is communicated with the pyrolysis gas combustion chamber through the waste heat recycling unit; the outlet of the pyrolysis gas combustion chamber is connected with the inlet of the dust removal unit, the outlet of the dust removal unit is connected with the inlet of the deacidification unit, and the outlet of the deacidification unit is connected with the chimney. The utility model discloses a be applicable to rubbish pyrolysis gasification technical field, can not through preliminary treatment processes such as classification, drying refuse disposal, can avoid rubbish to pile up in the pyrolysis gasifier and put up the canopy, make device continuous, steady operation, improve the operating efficiency, extension grate life reduces the running cost, can realize modularization, the miniaturized design of equipment, improves and equips the flexibility, satisfies the refuse treatment demand of different scales. However, the utility model has the following disadvantages: the pyrolysis gasification furnace adopts a fixed bed type, the gasification efficiency is low, the furnace type determines that the temperature of the pyrolysis gasification furnace is lower (necessarily lower than the melting temperature of the garbage fed into the furnace), and the pyrolysis slag after the garbage pyrolysis can not be melted at high temperature to form a vitreous body, so that the thorough harmless treatment is difficult to realize; pyrolysis gasificationThe furnace can only pyrolyze the garbage with higher melting point, and the raw material adaptability is poor; because the pyrolysis reaction temperature is low, the pyrolysis gas contains components such as tar, phenols, dioxin and the like, the pyrolysis gas can be discharged only after being fully combusted in a pyrolysis gas combustion chamber, and the combustion process enables the pyrolysis gas to contain CO and H2The cracking gas with equal components is completely combusted to generate CO2、H2Flue gas mainly containing O cannot fully utilize effective components of pyrolysis gas; the pyrolysis gas combustion chamber adopts a refractory brick layer for heat insulation, so that the heat loss is large and the heat recycling effect is low; the system is mainly designed by miniaturized equipment and is difficult to meet the requirement of large-scale processing.
Chinese utility model patent application No. 201810763719.9, publication No. CN108826318A, publication No. 2018-11-16 disclose a household garbage disposal system and a household garbage disposal method. The system comprises a pretreatment device, an incinerator, a flue gas separation device, a flue gas purification device and a plasma gasification cracking melting device. The pretreated garbage outlet of the pretreatment device is connected with the pretreated garbage inlet of the incinerator; the high-temperature flue gas outlet of the incinerator is connected with the flue gas inlet of the gas-solid separator of the flue gas separating device; the first waste gas outlet of the gas-solid separator is connected with the first waste gas inlet of the flue gas purification device; the plasma gasification cracking melting device comprises a plasma gasification cracking melting furnace and a liquid slag discharge quenching device which are mutually communicated, and a fly ash outlet of the gas-solid separator and a first solid residue outlet of the incinerator are connected with a plasma furnace solid waste feeding hole of the plasma gasification cracking melting furnace. The generated gas emission is clean in composition, and cannot cause secondary pollution to the atmosphere; the generated solid product can be reused. However, the utility model has the following disadvantages: in order to increase the temperature of the incinerator, the reducing gases (CO and H) at the outlet of the melting furnace are gasified and cracked by plasma2Mainly) is sent into an incinerator for combustion supporting and then enters a flue gas discharge system, and the resource utilization of the reducing gas cannot be realized; when the heat value of the household garbage fed into the incinerator is low or unstable, harmful substances such as tar, phenol, dioxin and the like in high-temperature smoke generated by the incinerator are easy to enter a subsequent system; the melting process adopts a plasma method, so that the energy consumption is high and the life is longThe cost of garbage disposal is high, and large-scale industrialization is difficult to realize.
SUMMERY OF THE UTILITY MODEL
1. The to-be-solved technical problem of the utility model
The utility model provides a problem that the gasification of solid useless rubbish melting system is difficult to realize large-scale industrialization processing scale to the energy consumption that current solid useless rubbish processing method exists is high, the thermal efficiency is low, gasification efficiency is low, raw materials adaptability is poor, ash innocent treatment is not thorough, easily presss from both sides harmful substance (tar, phenol, dioxin etc.) in the flue gas, the utility model provides a solid useless rubbish.
2. Technical scheme
In order to solve the technical problem, the utility model provides a technical scheme does:
a solid waste garbage gasification melting system comprises a solid waste garbage feeding unit, a circulating fluidized bed gasification unit, an entrained flow bed gasification melting unit, a waste heat recovery and dust removal unit and a gasification gas purification unit which are sequentially connected, wherein the waste heat recovery and dust removal unit comprises a gasification agent preheater, a waste heat boiler, a dust remover and a gas cooler which are sequentially connected, the bottom of the dust remover is connected with a fly ash circulating pipeline, a material returning unit is arranged on the fly ash circulating pipeline, the circulating fluidized bed gasification unit comprises a circulating fluidized bed gasification furnace and a circulating fluidized bed gas-solid separator, and the material returning unit is connected with a material returning port of the circulating fluidized bed gasification furnace.
According to a further technical scheme, the solid waste feeding unit comprises a feeding bin, a feeding lock and a feeding machine which are sequentially connected, the feeding bin is connected with a solid waste conveying pipeline and an auxiliary material conveying pipeline, and an output pipeline of the feeding machine is connected with a feeding port of the circulating fluidized bed gasification furnace; the gasification agent preheater is a plurality of preheaters, the waste heat boiler is one or a plurality of waste heat boilers, and the waste heat recovery and dust removal unit is provided with a one-stage or multi-stage dust remover.
In a further technical scheme, the circulating fluidized bed gas-solid separator is connected with the bottom of the circulating fluidized bed gasification furnace through a material returning device.
According to a further technical scheme, the entrained flow bed gasification melting unit comprises an entrained flow bed gasification furnace, and the entrained flow bed gasification furnace is an upward radiation waste boiler type gasification furnace; the entrained flow gasifier comprises a radiant waste boiler, a gasification melting chamber and a cold slag chamber which are sequentially connected from top to bottom, an output pipeline of the cold slag chamber is connected with a slag lock hopper, and the output pipeline of the slag lock hopper is introduced into a slag pool; one or more burners are arranged at the middle lower part of the gasification melting chamber, and the burners are connected with a gasified gas output pipeline at the top of the circulating fluidized bed gas-solid separator.
According to a further technical scheme, the gasification device further comprises a gasification agent conveying pipeline, the gasification agent conveying pipeline is divided into a first branch and a second branch after passing through the gasification agent preheater, the first branch is connected with the combustor, and the second branch is introduced into the bottom of the circulating fluidized bed gasification furnace.
According to a further technical scheme, the material returning unit comprises an ash bin, an ash hopper, an ash lock and an ash conveyer which are sequentially connected, wherein the ash bin is connected with the fly ash circulating pipeline, and an output pipeline of the ash conveyer is connected with a feeding port of the circulating fluidized bed gasification furnace; the bottom of the circulating fluidized bed gasification furnace is provided with a gasification slag outlet, and the gasification slag outlet is connected with the ash bin.
3. Advantageous effects
The technical scheme provided by the utility model, compared with prior art, following beneficial effect has:
(1) the utility model firstly sends the solid waste garbage into the circulating fluidized bed gasification unit for oxidation-reduction reaction, the circulating fluidized bed gasification furnace has high reaction temperature and high circulating multiplying power, the gasification efficiency of the solid waste garbage is improved, and the generated gasified gas basically does not contain harmful substances such as tar, phenol, dioxin and the like;
(2) the utility model sends the gasified gas generated by the gasification of the circulating fluidized bed and the entrained non-gasified flying ash into the entrained flow bed gasification melting furnace for further reaction, the gasification melting temperature is high, the harmful substances such as trace tar, phenol, dioxin and the like in the gasified gas are thoroughly eliminated, and the gasified gas is cooled and solidified into harmless vitreous bodies in the cold slag chamber, and finally discharged through the slag lock hopper and the slag pool, so that the gasified gas can be used as building materials, and the harmless and resource treatment of solid waste garbage is realized;
(3) the entrained flow gasifier of the utility model adopts an upward radiation waste boiler type, high-temperature gasified gas generated by the gasification melting chamber goes upward to radiate the waste boiler, generated liquid molten ash enters the cold slag chamber, the flow directions of the gasified gas and the molten ash are just opposite, so that the gasified gas and the molten ash are efficiently separated, the operation stability of the entrained flow gasification melting unit is improved, and the large-scale industrialization of solid waste garbage treatment is easy to realize;
(4) the entrained flow gasifier of the utility model adopts an upward radiation waste boiler type, high-temperature gasified gas generated by the gasification melting chamber goes upward to radiate the waste boiler, and the byproduct of 4-10MPa steam is generated, so that the heat recovery is sufficient, the heat efficiency of the gasification melting system is improved, and the economy of treating solid waste garbage is improved;
(5) the utility model discloses the gasified gas after the purification that the gasified gas purification unit produced uses reducing component CO, H2Mainly, can be used as chemical synthesis gas or fuel gas, and realizes the resource treatment of solid waste;
(6) the fly ash separated and collected by the waste heat recovery and dust removal unit of the utility model enters the circulating fluidized bed gasification unit for further gasification, thereby theoretically realizing zero emission of the fly ash and avoiding secondary pollution;
(7) the waste heat recovery and dust removal unit is provided with one or more gasifying agent preheaters and waste heat boilers, so that the consumption of the gasifying agent is reduced, the steam auxiliary output is improved, and the energy consumption is further reduced;
(8) the fly ash content in the gasified gas at the outlet of the waste heat recovery and dust removal unit of the utility model is lower than 10mg/Nm3The cleaning degree is high;
(9) the utility model can send the gasified slag of the circulating fluidized bed back to the circulating fluidized bed gasification furnace through the slag bin and the slag returning system, so that the slag generated in the gasification reaction process of the solid waste garbage is discharged in a vitreous form through the entrained flow bed gasification melting unit, and the gasified slag can be used as building materials to realize the thorough harmless and recycling treatment of the solid waste garbage;
(10) the utility model can send the auxiliary material and the solid waste garbage into the circulating fluidized bed gasification unit, thereby improving the vitrification degree of the solid waste garbage slag and realizing the harmless treatment of the solid waste garbage;
(11) the utility model has wide particle size range (0-10mm) of solid waste garbage; the heat value requirement of the adapted solid waste garbage is low (higher than 2000kCal/kg), and the heat value requirement of the solid waste garbage can be further reduced according to the heat value of the added auxiliary materials; the disposable solid waste garbage has wide variety (one or more of biomass, oily sludge, industrial furnace ash, household garbage and solid hazardous waste), and solves the problem of poor adaptability of raw materials.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic flow chart of the solid waste garbage gasification and melting system and method of the present invention;
in the figure, 1, a circulating fluidized bed gasification unit; 2. an entrained flow gasification melting unit; 3. a waste heat recovery and dust removal unit; 4. a gasification gas purification unit; 5. a solid waste garbage feeding unit, 6, a material returning unit; 101. a circulating fluidized bed gasifier; 102. a circulating fluidized bed gas-solid separator; 103. a material returning device; 104. a solid waste conveying pipeline; 105. an auxiliary material conveying pipeline; 106. a gasification agent delivery conduit; 201. radiating the waste boiler; 202. a gasification melting chamber; 203. a slag cooling chamber; 204. a slag lock hopper; 205. a slag pool; 206. a burner; 207. an entrained flow gasifier; 301. a gasifying agent preheater; 302. a waste heat boiler; 303. a dust remover; 304. a gas cooler; 501. a feeding bin; 502. a feeding lock; 503. a feeder; 601. a slag bin; 602. a slag hopper; 603. ash lock; 604. ash conveyor
Detailed Description
The technical solution of the present invention will be described clearly and completely below with reference to specific embodiments of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, the present embodiment provides a solid waste gasification melting system, which includes a solid waste feeding unit 5, a circulating fluidized bed gasification unit 1, an entrained flow bed gasification melting unit 2, a waste heat recovery and dust removal unit 3, and a gasification gas purification unit 4, which are connected in sequence, wherein the waste heat recovery and dust removal unit 3 includes a gasification agent preheater 301, a waste heat boiler 302, a dust remover 303, and a gas cooler 304, which are connected in sequence, a fly ash circulation pipeline is connected to the bottom of the dust remover 303, a material returning unit 6 is disposed on the fly ash circulation pipeline, the circulating fluidized bed gasification unit 1 includes a circulating fluidized bed gasification furnace 101 and a circulating fluidized bed gas-solid separator 102, and the material returning unit 6 is connected to a material returning port of the circulating fluidized bed gasification furnace.
The solid waste garbage feeding unit 5 comprises a feeding bin 501, a feeding lock 502 and a feeding machine 503 which are connected in sequence, an output pipeline of the feeding machine 503 is connected with a feeding port of the circulating fluidized bed gasification furnace 101, and the feeding bin 501 is connected with a solid waste garbage conveying pipeline 104 and an auxiliary material conveying pipeline 105. In the present invention, the auxiliary material refers to a material that helps promote solid waste to form harmless vitreous bodies in the entrained-flow gasifier, and particularly refers to one or more of gasified coal cinder, river sand, or limestone. According to the heat value of the auxiliary material, the heat value requirement of the solid waste garbage can be further reduced, and the raw material adaptability of the solid waste garbage is widened.
The utility model discloses in, waste heat recovery and dust removal unit 3 can be equipped with one or more gasification agent pre-heaters 301, preheats the gasification agent to 400-; one or more exhaust heat boilers 302 may also be provided to recover the heat of the gasification gas via the byproduct steam. The waste heat recovery and dust removal unit 3 is provided with a one-stage or multi-stage dust remover 303, so that the fly ash content in the gasified gas at the outlet of the waste heat recovery and dust removal unit is lowAt 10mg/Nm3。
Wherein, the circulating fluidized bed gas-solid separator 102 is connected with the bottom of the circulating fluidized bed gasification furnace 101 through a material returning device 103.
The entrained flow bed gasification melting unit 2 comprises an entrained flow bed gasification furnace 207, wherein the entrained flow bed gasification furnace 207 is an upward radiation waste boiler 201 type gasification furnace; the entrained-flow bed gasification furnace 207 comprises a radiation waste boiler 201, a gasification melting chamber 202 and a cold slag chamber 203 which are sequentially connected from top to bottom, an output pipeline of the cold slag chamber 203 is connected with a slag lock hopper 204, and an output pipeline of the slag lock hopper 204 is introduced into a slag pool 205; one or more burners 206 are installed in the lower middle portion of the gasification melting chamber 202, and the burners 206 are connected to the gasification gas output pipe at the top of the circulating fluidized bed gas-solid separator 102.
The gasification device also comprises a gasification agent conveying pipeline 106, wherein the gasification agent conveying pipeline 106 is divided into a first branch and a second branch after passing through the gasification agent preheater 301, the first branch is connected with the burner 206, and the second branch is introduced into the bottom of the circulating fluidized bed gasification furnace 101.
The material returning unit 6 comprises an ash bin 601, an ash hopper 602, an ash lock 603 and an ash conveyor 604 which are connected in sequence, wherein the ash bin 601 is connected with a fly ash circulating pipeline, and an output pipeline of the ash conveyor 604 is connected with a feeding port of the circulating fluidized bed gasification furnace 101; the bottom of the circulating fluidized bed gasification furnace 101 is provided with a gasified slag outlet, and the gasified slag outlet is connected with the ash bin 601.
The embodiment also provides a solid waste garbage gasification melting method by adopting the solid waste garbage gasification melting system, which comprises the following steps:
step one, circulating fluidized reaction: the rotary kiln furnace slag with the granularity of 0-10mm is used as a solid waste raw material and a transportation material and enters the bottom of the circulating fluidized bed gasification furnace 101 through a solid waste feeding system, and is subjected to oxidation-reduction reaction with a preheated gasification agent (90% of oxygen-enriched air and water vapor) in the furnace, wherein the reaction pressure is 0.5MPa, and the reaction temperature is 900 ℃; the generated gasified gas and solid particles enter a gas-solid separator 102 of the circulating fluidized bed, most of the solid particles are separated and enter a gasification furnace 101 of the circulating fluidized bed through a material returning device 103 for circulating gasification;
step two, entrained flow bed gasification melting reaction: gasified gas at the outlet of the gas-solid separator and entrained non-gasified fly ash enter a gasification melting chamber 202 of an entrained flow gasifier 207 through a burner 206 together with a preheated gasification agent (90 percent of oxygen-enriched air and water vapor, the weight ratio of the oxygen-enriched air to the water vapor is 2: 1) to carry out gasification melting reaction, the reaction temperature is 1500 ℃, the reaction pressure is 0.35MPa, the generated high-temperature gasified gas ascends to enter a radiation waste boiler 201, a byproduct of saturated steam with the pressure of 4MPa is produced, the self temperature of the gasified gas is reduced to 700 ℃, the generated liquid molten ash descends to enter a slag cooling chamber 203, the ash is quenched and solidified by water to form vitreous ash, the vitreous ash is discharged to a slag pool 205 through a slag lock 204, and the vitreous ash is collected and then is sent out to be used as a building;
step three, waste heat recovery and dust removal purification: the gasified gas at the outlet of the radiation waste boiler 201 enters a gasifying agent preheater 301, after a gasifying agent (90% of oxygen-enriched air and water vapor, the weight ratio of the oxygen-enriched air to the water vapor is 2: 1) is preheated to 650 ℃, the gasified gas is cooled to 300 ℃, enters a waste heat boiler 302 and produces 0.5MPa saturated steam to further recover heat, and the temperature of the gasified gas at the outlet of the waste heat boiler 302 is about 180 ℃; then passes through a gas cooler 304 and a gasification gas purification unit 4, and the obtained purified gasification gas contains reducing components of CO and H2Mainly, the raw materials are sent to a rear working section;
step four, fly ash circulation reaction: fly ash is separated and collected by a dust collector 303, and the content of the fly ash of gasified gas after dust collection is lower than 10mg/Nm3And the collected circulating fly ash is sent back to the circulating fluidized bed gasification furnace 101 for circulating gasification without discharging. And the gasification slag of the circulating fluidized bed is discharged to an ash bin 503 and then enters the circulating fluidized bed gasification furnace 101 through an ash return system;
the gasified slag discharged from the bottom of the circulating fluidized bed gasification furnace 101 in the embodiment belongs to common solid waste, and is directly sent out without being sent into the circulating fluidized bed again.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a solid useless rubbish gasification melting system which characterized in that: the device comprises a solid waste garbage feeding unit, a circulating fluidized bed gasification unit, an entrained flow bed gasification melting unit, a waste heat recovery and dust removal unit and a gasification gas purification unit which are sequentially connected, wherein the waste heat recovery and dust removal unit comprises a gasification agent preheater, a waste heat boiler, a dust remover and a gas cooler which are sequentially connected, the bottom of the dust remover is connected with a fly ash circulating pipeline, a material returning unit is arranged on the fly ash circulating pipeline, the circulating fluidized bed gasification unit comprises a circulating fluidized bed gasification furnace and a circulating fluidized bed gas-solid separator, and the material returning unit is connected with a material returning port of the circulating fluidized bed gasification furnace.
2. The solid waste garbage gasification melting system of claim 1, wherein: the solid waste feeding unit comprises a feeding bin, a feeding lock and a feeding machine which are sequentially connected, the feeding bin is connected with a solid waste conveying pipeline and an auxiliary material conveying pipeline, and an output pipeline of the feeding machine is connected with a feeding port of the circulating fluidized bed gasification furnace; the gasification agent preheater is a plurality of preheaters, the waste heat boiler is one or a plurality of waste heat boilers, and the waste heat recovery and dust removal unit is provided with a one-stage or multi-stage dust remover.
3. The solid waste garbage gasification melting system of claim 1, wherein: the gas-solid separator of the circulating fluidized bed is connected with the bottom of the circulating fluidized bed gasification furnace through a material returning device.
4. The solid waste garbage gasification melting system of claim 1, wherein: the entrained flow bed gasification melting unit comprises an entrained flow bed gasification furnace, and the entrained flow bed gasification furnace is an upward radiation waste boiler type gasification furnace; the entrained flow gasifier comprises a radiant waste boiler, a gasification melting chamber and a cold slag chamber which are sequentially connected from top to bottom, an output pipeline of the cold slag chamber is connected with a slag lock hopper, and the output pipeline of the slag lock hopper is introduced into a slag pool; one or more burners are arranged at the middle lower part of the gasification melting chamber, and the burners are connected with a gasified gas output pipeline at the top of the circulating fluidized bed gas-solid separator.
5. The solid waste garbage gasification melting system of claim 4, wherein: the gasification device is characterized by further comprising a gasification agent conveying pipeline, wherein the gasification agent conveying pipeline is divided into a first branch and a second branch after passing through the gasification agent preheater, the first branch is connected with the combustor, and the second branch is communicated to the bottom of the circulating fluidized bed gasification furnace.
6. The solid waste garbage gasification melting system of claim 1, wherein: the material returning unit comprises an ash bin, an ash hopper, an ash lock and an ash conveyer which are connected in sequence, the ash bin is connected with the fly ash circulating pipeline, and an output pipeline of the ash conveyer is connected with a feeding port of the circulating fluidized bed gasification furnace; the bottom of the circulating fluidized bed gasification furnace is provided with a gasification slag outlet, and the gasification slag outlet is connected with the ash bin.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110205166A (en) * | 2019-06-25 | 2019-09-06 | 河南信祥环境科技有限公司 | A kind of solid waste refuse gasification fusing system and method |
| CN111394131A (en) * | 2020-03-31 | 2020-07-10 | 江苏大学 | Solid waste garbage gasification method and system with heat recovery function |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110205166A (en) * | 2019-06-25 | 2019-09-06 | 河南信祥环境科技有限公司 | A kind of solid waste refuse gasification fusing system and method |
| CN111394131A (en) * | 2020-03-31 | 2020-07-10 | 江苏大学 | Solid waste garbage gasification method and system with heat recovery function |
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