CN115638419A - Oxygen carrier-assisted combustible solid waste fluidized bed combustion device and method - Google Patents
Oxygen carrier-assisted combustible solid waste fluidized bed combustion device and method Download PDFInfo
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- CN115638419A CN115638419A CN202211251453.2A CN202211251453A CN115638419A CN 115638419 A CN115638419 A CN 115638419A CN 202211251453 A CN202211251453 A CN 202211251453A CN 115638419 A CN115638419 A CN 115638419A
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The invention relates to the technical field of solid waste treatment, in particular to an oxygen carrier auxiliary combustible solid waste fluidized bed combustion device and a method, which can greatly improve the combustion stability and the combustion efficiency of combustible solid waste.
Description
Technical Field
The invention relates to the technical field of solid waste treatment, in particular to an oxygen carrier auxiliary combustible solid waste fluidized bed combustion device and method.
Background
The incineration technology has become one of the main treatment modes of combustible solid waste at home and abroad due to the advantages of land saving, large treatment capacity, realization of heat utilization and the like. Fluidized bed combustion as a clean combustion technology with fuel adaptability, flexible furnace temperature and load control and low NO x Has remarkable advantages in the aspects of emission, combustion efficiency and the like, and is widely applied to the incineration of various combustible solid wastes.
However, combustible solid waste is generally characterized by complex composition, poor flowability, low energy density, high volatile content, and the like. The combustion in the fluidized bed causes the problems of accumulation of fuel near the feeding point, layering with bed materials and the like, and causes uneven combustion and distribution of the fuel along the section direction of the hearth. These can cause poor combustion stability of the solid waste fluidized bed and CO and NO in the flue gas x And the pollutant discharge fluctuation is large, thereby bringing low combustion efficiency. Therefore, the clean and efficient combustion of the combustible solid waste in the fluidized bed boiler is realized by the reduction treatment andan important way for resource utilization.
Disclosure of Invention
In order to solve the problems of poor combustion stability and low combustion efficiency of the existing combustible solid waste, the invention provides an oxygen carrier-assisted combustible solid waste fluidized bed combustion device, which can greatly improve the combustion stability and the combustion efficiency of combustible solid waste.
The technical scheme is as follows: the utility model provides an oxygen carrier auxiliary combustible solid useless fluidized bed burner, its includes the fluidized bed device, the fluidized bed device is connected solid useless feeder, the fluidized bed device top is connected the smoke inlet of separator, the outlet flue is connected to the mouth that goes out of separator, its characterized in that, the lower part of fluidized bed device is the rapid cycle fluidized bed that the swell fluidized bed, upper portion promote the section and be the binding off structure, the upper portion of fluidized bed device promotes the section and connects oxygen carrier feeder, the material return mouth of separator connects the upper portion of fluidized bed device promotes the section, the bottom plenum of fluidized bed device and set up in the secondary wind gap of the upper portion of fluidized bed device promote the section all connect the forced draught blower, be provided with heated surface, denitration system, dust pelletizing system, desulfurization system in the outlet flue, solid useless feeder connects solid useless feed bin, the oxygen carrier device connects the oxygen carrier feed bin, the separator includes cyclone, impacted style separator and shutter formula separator.
The solid waste feeding device is further characterized by comprising a screw feeder, a belt conveying feeder, a scraper feeder, a star-shaped feeder and a vibrating feeder.
The combustion method of the oxygen carrier auxiliary combustible solid waste fluidized bed device is characterized by comprising the following steps:
(1) Combustible solid waste is sent into the lower part of the fluidized bed device and is mixed with primary air under the assistance of fuel ash and inert bed materials to be combusted at 650-950 ℃, the chemical equivalence ratio is less than 1, and low NO is generated in flue gas due to insufficient oxygen below a secondary air port x Reducing combustible gas and coke particles;
(2) Low NO produced in step (1) x The reducing combustible gas and the coke particles enter the upper lifting section of the fluidized bed device along with the fluidized medium and are mixed with secondary air fed by the air feeder to carry out combustion reaction at 650-950 ℃;
(3) Oxygen carrier is sent into the upper lifting section of the fluidized bed device, and oxygen and combustible gas in the flue gas and oxygen carrier particles in the upper lifting section are subjected to oxidation-reduction reaction;
(4) After the flue gas and the oxygen carrier particles in the upper lifting section of the fluidized bed device enter the separator, the oxygen carrier particles are captured by the separator and return to the lower part of the lifting section, the oxygen carrier circulates in the furnace and assists combustion, and a small amount of supplement is needed due to the loss of the oxygen carrier;
(5) And the flue gas at the outlet of the separator is discharged after passing through the heating surface, the denitration system, the dust removal system and the desulfurization system.
The fuel is further characterized in that the combustible solid waste comprises coal gangue, agriculture and forestry solid waste, household garbage, sludge, waste textile, waste leather products, waste wood products, cloth, sludge, household garbage, vinasse, waste paper, waste rubber products, waste plastic products, waste composite packages, plant residues, animal residues, poultry and livestock manure, grain and food processing waste, traditional Chinese medicine residues and a mixture of any two or more of the materials;
the oxygen carrier comprises a metal-based oxygen carrier, a non-metal-based oxygen carrier or a composite oxygen carrier, wherein the metal-based oxygen carrier comprises iron-based, manganese-based, nickel-based, copper-based and cobalt-based oxygen carriers, and ores and waste residues containing iron, manganese, nickel, copper and cobalt oxides; the non-metal-based oxygen carrier comprises CaSO 4 Or BaSO 4 (ii) a The composite base oxygen carrier comprises a synthetic oxygen carrier containing any two or more than two metal oxides of iron, manganese, nickel, copper and cobalt;
the denitration process comprises a selective non-catalytic reduction process, a selective catalytic reduction process and a combined process thereof or a plasma denitration technology, an ozone oxidation denitration technology and a solid polymer denitration technology; the desulfurization process comprises a wet method, dry method or semi-dry method flue gas desulfurization process; the dust removal system comprises gravity settling dust removal, cyclone dust removal, an electrostatic dust collector, a bag-type dust collector and combination thereof;
the reaction pressure of the fluidized bed device is normal pressure, the fluidizing medium is air, and the bottom of the fluidized bed device is provided with a slag discharge port.
After the invention is adopted, the fuel is firstly combusted with primary air at the lower part of the fluidized bed device in a low chemical equivalence ratio manner to quickly generate low NO x The reducing product of the flue gas, the reducing atmosphere being such as to convert NO x Reduction to N 2 Reduction of fuel nitrogen to NO x In a ratio of (B) to (C), low NO produced x 、Combustible gas enters an upper lifting section of the fluidized bed device, oxygen carrier particles have the capability of absorbing and releasing oxygen, the uniformity of oxygen and temperature distribution in the upper lifting section can be improved, the combustion stability and combustion efficiency of fuel are improved, and the clean and efficient resource utilization rate of solid waste is greatly improved; further, a portion of the active component of the oxygen carrier particle may catalyze NO x The reduction of (2) is favorable for improving the denitration efficiency of the SNCR system in the outlet flue and improving the exhaust emission standard.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention.
Detailed Description
Referring to fig. 1, an oxygen carrier auxiliary combustible solid waste fluidized bed combustion device comprises a fluidized bed device 1, the fluidized bed device 1 is connected with a solid waste feeding device 3, the top of the fluidized bed device 1 is connected with a smoke inlet of a separator 6, a smoke outlet of the separator 6 is connected with an outlet flue, the lower portion of the fluidized bed device 1 is a bulging fluidized bed, an upper lifting section of the fluidized bed device 1 is a fast circulating fluidized bed with a closed structure, the upper lifting section of the fluidized bed device 1 is connected with an oxygen carrier feeding device 5, the solid waste feeding device 3 is connected with a solid waste bin 2, the oxygen carrier feeding device 5 is connected with an oxygen carrier bin 4, a material returning port of the separator 6 is connected with the upper lifting section of the fluidized bed device 1, a bottom air chamber of the fluidized bed device 1 and a secondary air port arranged at the upper lifting section of the fluidized bed device 1 are both connected with an air feeder 10, a heating surface (not shown in the figure) is arranged in the outlet flue, a denitration system 7, a dust removal system 8 and a desulfurization system 9 are arranged in the outlet flue, a chimney 11 is connected with the tail portion of the flue, a slag discharging port is arranged at the bottom of the fluidized bed device 1, and the slag discharging port is connected with a slag bin 12.
The separators 6 include cyclone separators, impingement separators and louvered separators.
The solid waste feeding device 3 comprises a screw feeder, a belt conveying and feeding device, a scraper feeder, a star feeder and a vibrating feeder.
The invention utilizes the combustion device with the lower part being the bulge fluidized bed and the upper lifting section being the oxygen carrier-assisted rapid circulating fluidized bed, improves the solid waste combustion efficiency and simultaneously reduces the oxygen carrier loss and the replenishment cost. Firstly, combustible solid waste is fed into the lower part of the fluidized bed device 1, and combustion with low stoichiometric ratio is carried out under the organization of primary air, so that a large amount of low NO is generated x High reducing flue gas (containing H) 2 O、CO 2 、CO、H 2 、C x H y And NH 3 Etc.) into the upper lift section; oxygen carrier particles with oxygen absorbing and releasing capacity assist in fuel conversion in a loop formed by the lifting section and the separator, and fuel conversion efficiency is improved. In addition, the oxygen carrier only circulates in a circulation loop formed by the lifting section and the separator, so that on one hand, the oxygen carrier cannot damage the reducing atmosphere below secondary air, and the NO is reduced x Original discharge; on the other hand, the oxygen carrier can not be discharged out of the hearth along with the slag, and the loss and the application cost of the oxygen carrier can be reduced.
Specifically, the combustion method of the oxygen carrier auxiliary combustible solid waste fluidized bed device comprises the following steps:
(1) Combustible solid waste is fed into the lower part of the fluidized bed device, is mixed with primary air under the assistance of fuel ash and inert bed materials and is combusted at the temperature of 650-950 ℃, the chemical equivalent ratio is less than 1, and because oxygen below a secondary air port is insufficient, a large amount of low NO is generated in flue gas x Reducing combustible gas and crushed coke particles with smaller size;
(2) Low NO produced in step (1) x The reducing combustible gas and smaller coke particles enter the upper lifting section of the fluidized bed device along with the fluidized medium and are mixed with secondary air fed by the air feeder to carry out combustion reaction at 650-950 ℃;
(3) The oxygen carrier is fed into the upper lifting section of the fluidized bed device, and oxygen and combustible gas in the flue gas and oxygen carrier particles in the upper lifting section are subjected to oxidation-reduction reaction, so that the oxygen and fuel are distributed more uniformly, and the fuel conversion rate is improved;
(4) After the flue gas and oxygen carrier particles at the upper lifting section of the fluidized bed device enter the separator, the oxygen carrier particles are captured by the separator and return to the lower part of the lifting section, the oxygen carrier circulates in the furnace and assists in combustion, and in the operation process, a small amount of oxygen carrier needs to be supplemented from the upper lifting section of the hearth due to the abrasion of the oxygen carrier;
(5) The flue gas at the outlet of the separator is discharged after passing through the heating surface, the denitration system, the dedusting system and the desulfurization system;
(6) The slag is discharged from a slag discharge port of the fluidized bed device.
The reaction pressure of the fluidized bed device is normal pressure, the fluidizing medium is air, the lower part is a bubbling fluidized bed, the upper lifting section is a rapid circulating fluidized bed, bed materials in the dense-phase region are fuel ash and inert particles, and particles in a circulating loop formed by the upper lifting section and the separator are oxygen carriers.
The combustible solid waste comprises coal gangue, agriculture and forestry solid waste, household garbage, sludge, waste textiles, waste leather products, waste wood products, cloth, sludge, household garbage, vinasse, waste paper, waste rubber products, waste plastic products, waste composite packages, plant residues, animal residues, livestock manure, grain and food processing waste, traditional Chinese medicine residues and a mixture of any two or more substances;
the oxygen carrier comprises a metal-based oxygen carrier, a non-metal-based oxygen carrier or a composite oxygen carrier, wherein the metal-based oxygen carrier comprises iron-based, manganese-based, nickel-based, copper-based and cobalt-based oxygen carriers, and ores and waste residues containing iron, manganese, nickel, copper and cobalt oxides; the non-metal-based oxygen carrier comprises CaSO 4 Or BaSO 4 (ii) a The composite base oxygen carrier comprises a synthetic oxygen carrier containing any two or more than two metal oxides of iron, manganese, nickel, copper and cobalt;
the denitration process comprises a selective non-catalytic reduction process, a selective catalytic reduction process and a combined process thereof or a plasma denitration technology, an ozone oxidation denitration technology and a solid polymer denitration technology; the desulfurization process comprises a wet method, dry method or semi-dry method flue gas desulfurization process; the dust removal system comprises gravity settling dust removal, cyclone dust removal, an electrostatic dust collector, a bag-type dust collector and combination thereof;
the reaction pressure of the fluidized bed device is normal pressure, and the fluidizing medium is air.
Claims (7)
1. The fluidized bed combustion device is characterized in that the lower part of the fluidized bed device is a bulging fluidized bed, the upper lifting section of the fluidized bed device is a rapid circulating fluidized bed of a closing structure, the upper lifting section of the fluidized bed device is connected with an oxygen carrier feeding device, a material returning port of the separator is connected with the upper lifting section of the fluidized bed device, a bottom air chamber of the fluidized bed device and a secondary air port arranged on the upper lifting section of the fluidized bed device are both connected with an air feeder, a heating surface, a denitration system, a dust removal system and a desulfurization system are arranged in the outlet flue, the solid waste feeding device is connected with a solid waste bin, the oxygen carrier feeding device is connected with an oxygen carrier bin, and the separator comprises a cyclone separator, an impact separator and a shutter type separator.
2. The fluidized bed combustion device for auxiliary combustion of oxygen carrier in solid waste of claim 1, wherein the feeding device for solid waste comprises a screw feeder, a belt-conveying feeder, a scraper feeder, a star feeder and a vibrating feeder.
3. The combustion method of the oxygen carrier auxiliary combustible solid waste fluidized bed device is characterized by comprising the following steps:
(1) Combustible solid waste is fed into the lower part of the fluidized bed device, and is mixed with primary air under the assistance of fuel ash and inert bed materials to be combusted at 650-950 ℃, the chemical equivalent ratio is less than 1, and the secondary air is used as fuelThe oxygen below the secondary tuyere is insufficient, and low NO is generated in the flue gas x Reducing combustible gas and coke particles;
(2) Low NO produced in step (1) x The reductive combustible gas and the coke particles enter an upper lifting section of the fluidized bed device along with a fluidized medium and are mixed with secondary air fed by a blower to generate a combustion reaction at 650-950 ℃;
(3) Oxygen carrier is sent into the upper lifting section of the fluidized bed device, and oxygen and combustible gas in the flue gas and oxygen carrier particles in the upper lifting section are subjected to oxidation-reduction reaction;
(4) After the flue gas and the oxygen carrier particles in the upper lifting section of the fluidized bed device enter the separator, the oxygen carrier particles are captured by the separator and return to the lower part of the lifting section, the oxygen carrier circulates in the furnace and assists combustion, and a small amount of supplement is needed due to the loss of the oxygen carrier;
(5) And the flue gas at the outlet of the separator is discharged after passing through the heating surface, the denitration system, the dust removal system and the desulfurization system.
4. The combustion method of the oxygen carrier-assisted combustible solid waste fluidized bed device according to claim 1, wherein the combustible solid waste comprises coal gangue, agriculture and forestry solid waste, household garbage, sludge, waste textiles, waste leather products, waste wood products, cloth, sludge, household garbage, vinasse, waste paper, waste rubber products, waste plastic products, waste composite packaging, plant residues, animal residues, livestock manure, grain and food processing waste, traditional Chinese medicine residues and a mixture of any two or more of the above substances.
5. The combustion method of the oxygen carrier auxiliary combustible solid waste fluidized bed device according to claim 1, characterized in that the oxygen carrier comprises a metal-based oxygen carrier, a non-metal-based oxygen carrier or a composite oxygen carrier, wherein the metal-based oxygen carrier comprises an iron-based, manganese-based, nickel-based, copper-based, cobalt-based oxygen carrier, and ore and waste slag containing oxides of iron, manganese, nickel, copper and cobalt; the non-metal-based oxygen carrier comprises CaSO 4 Or BaSO 4 (ii) a The composite base oxygen carrier comprises ironAnd any two or more of metal oxides of manganese, nickel, copper and cobalt.
6. The combustion method of the oxygen carrier-assisted combustible solid waste fluidized bed device according to claim 1, wherein the denitration process comprises a selective non-catalytic reduction process, a selective catalytic reduction process and a combined process thereof or a plasma denitration technology, an ozone oxidation denitration technology, a solid polymer denitration technology; the desulfurization process comprises a wet method, dry method or semi-dry method flue gas desulfurization process; the dust removal system comprises gravity settling dust removal, cyclone dust removal, an electrostatic dust collector, a bag-type dust collector and combination thereof.
7. The combustion method of the oxygen carrier auxiliary combustible solid waste fluidized bed device according to claim 1, wherein the reaction pressure of the fluidized bed device is normal pressure, the fluidizing medium is air, and a slag discharge port is formed at the bottom of the fluidized bed device.
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| CN114574250A (en) * | 2022-04-14 | 2022-06-03 | 河南大学 | Method and device for preparing clean synthesis gas through biomass chemical-looping gasification |
| US20220241745A1 (en) * | 2021-02-04 | 2022-08-04 | The Babcock & Wilcox Company | Apparatus for enclosing a chemical looping process |
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2022
- 2022-10-13 CN CN202211251453.2A patent/CN115638419B/en active Active
Patent Citations (7)
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| CN101349423A (en) * | 2008-09-05 | 2009-01-21 | 西安交通大学 | Double-circulating fluid bed system for chemical chain combustion |
| CN105222129A (en) * | 2015-11-05 | 2016-01-06 | 东南大学 | A kind of coal-fired burning chemistry chains separation of C O of the pure oxygen gasification that is coupled 2method |
| CN107687636A (en) * | 2017-08-11 | 2018-02-13 | 东南大学 | A kind of hydrocarbon gas combustion reactor and reaction method based on stacked fluid bed |
| CN113324244A (en) * | 2020-06-03 | 2021-08-31 | 东南大学 | System and process for treating solid fuel through auxiliary combustion of partial gasification coupling oxygen carrier |
| US20220241745A1 (en) * | 2021-02-04 | 2022-08-04 | The Babcock & Wilcox Company | Apparatus for enclosing a chemical looping process |
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