CN108144412B - Device and method for desulfurization and denitrification by combining double circulation of powder activated coke and ozone oxidation - Google Patents

Device and method for desulfurization and denitrification by combining double circulation of powder activated coke and ozone oxidation Download PDF

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Publication number
CN108144412B
CN108144412B CN201810111238.XA CN201810111238A CN108144412B CN 108144412 B CN108144412 B CN 108144412B CN 201810111238 A CN201810111238 A CN 201810111238A CN 108144412 B CN108144412 B CN 108144412B
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adsorption section
coke
flue gas
reactor
ozone
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CN108144412A (en
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张立强
马春元
张梦泽
王涛
朱晓
程星星
赵希强
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Shandong University
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Shandong University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/06—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8628—Processes characterised by a specific catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/70—Non-metallic catalysts, additives or dopants
    • B01D2255/702—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/302—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention discloses a device and a method for desulfurization and denitrification by combining double circulation of powder active coke and ozone oxidation. In the device, an inner member is arranged in a fluidized bed reactor to divide the fluidized bed reactor into an upper adsorption section and a lower adsorption section, a flue gas inlet pipe is arranged at the bottom of the lower adsorption section, a flue gas outlet pipe is arranged at the upper part of the upper adsorption section, ozone is sprayed into the flue gas inlet pipe by an ozone generating device, and active coke feeding devices provide powder active coke for the upper adsorption section; the flue gas enters the fluidized bed reactor after being mixed with ozone in a flue gas inlet pipe, flows upwards, is discharged from a flue gas outlet pipe and sequentially enters an inertial separator and a dust remover, a circulation Jiao Geiliao component is arranged at the bottoms of the inertial separator and the dust remover, a circulation Jiao Geiliao component conveys part of circulating coke separated by the inertial separator and the dust remover to an upper adsorption section, and the other part of circulating coke is conveyed to a lower adsorption section; the diameter of the reactor inlet pipe is smaller than that of the pipe body of the lower adsorption section, the reactor inlet pipe and the pipe wall of the lower adsorption section form an annular groove, and a spent coke outlet is arranged at the bottom of the annular groove.

Description

Device and method for desulfurization and denitrification by combining double circulation of powder activated coke and ozone oxidation
Technical Field
The invention relates to the field of removal of pollutants in combustion flue gas, in particular to a device and a method for realizing combined removal of sulfur dioxide and nitrogen oxides in coal-fired flue gas by combining ozone oxidation with active coke adsorption.
Background
Active coke desulfurization is a flue gas desulfurization technology capable of recycling, and has obvious synergic removal effect on pollutants such as heavy metals in flue gas. The active coke desulfurization technology in the current market mainly adopts a moving bed adsorption-heating regeneration process route, the moving bed adsorption process adopts shaped particle active coke with higher mechanical strength, and the appearance is generally columnar with the diameter of phi 5-9 mm. The powder active Jiao Liuhua bed adsorption desulfurization is a novel active coke desulfurization process route, the process avoids mechanical loss caused by abrasion of columnar active carbon, the powder active carbon has lower cost, and the surface utilization rate is improved relative to that of the columnar active carbon. The active coke has weak adsorption effect on nitric oxide, and the nitric oxide in the flue gas is mainly nitric oxide, so that the combined removal of the nitric oxide is difficult to realize directly through the adsorption process. The active coke is used as a porous material, is a catalyst capable of realizing selective catalytic denitration at low temperature, and the traditional active coke desulfurization process usually utilizes the catalytic action of the active coke to reduce nitrogen oxides into nitrogen by spraying ammonia, so as to realize denitration, however, the ammonia is also an atmospheric pollutant, the ammonia is adopted to carry out denitration on flue gas, and the addition amount of the ammonia is required to be strictly controlled so as to prevent secondary pollution, thus the process requirement is more strict.
Disclosure of Invention
In order to solve the defects of the prior art, one of the purposes of the invention is to provide a powder active Jiao Liuhua bed desulfurization and ammonia injection combined denitration device, and the purpose of combined removal of sulfur dioxide and nitrogen oxides can be realized in the device.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the device comprises a fluidized bed reactor, an ozone generating device, an active coke feeding device, an inertial separator and a dust remover, wherein the fluidized bed reactor is vertically arranged, an inner member is arranged in the fluidized bed reactor to divide the fluidized bed reactor into an upper adsorption section and a lower adsorption section, a reactor flue gas inlet pipe is arranged at the bottom of the lower adsorption section, a reactor flue gas outlet pipe is arranged at the upper part of the upper adsorption section, ozone is sprayed into the reactor flue gas inlet pipe by the ozone generating device, and the active Jiao Geiliao device provides powder active coke for the upper adsorption section; the flue gas sequentially enters a lower adsorption section and an upper adsorption section of the fluidized bed reactor after being mixed with ozone in a flue gas inlet pipe of the reactor, then sequentially enters an inertial separator and a dust remover after being discharged from a flue gas outlet pipe of the reactor, a circulation Jiao Geiliao component is arranged at the bottoms of the inertial separator and the dust remover, and a circulation Jiao Geiliao component conveys part of circulating coke separated by the inertial separator and the dust remover to the upper adsorption section and the other part of circulating coke to the lower adsorption section;
the inner member is a component which can allow the flue gas of the lower adsorption section to enter the upper adsorption section and prevent active coke in the upper adsorption section from entering the lower adsorption section, such as a check valve and the like;
the diameter of the reactor inlet pipe is smaller than that of the pipe body of the lower adsorption section, the reactor inlet pipe and the pipe wall of the lower adsorption section form an annular groove, and a spent coke outlet is arranged at the bottom of the annular groove.
The flue gas is mixed with ozone in the inlet pipe of the reactor, so that part of nitric oxide is oxidized into nitrogen dioxide, and then enters the lower adsorption section. In the lower adsorption section, the circulating coke from the inertial separator and the dust remover pre-adsorbs sulfur oxide compounds and nitrogen dioxide in the flue gas to achieve the purpose of pre-desulfurization and denitrification, and then ozone takes the rest part of nitric oxide as nitrogen dioxide under the catalysis of the circulating coke to promote the adsorption of the circulating coke on the nitrogen oxide; simultaneously, in the process that the flue gas carries circulating coke to flow upwards, most of spent coke for absorbing sulfur oxides and carbon dioxide is blown to the pipe wall of the lower absorption section, and then falls into the annular groove along the pipe wall of the lower absorption section, so that the spent coke in the lower absorption section is discharged. In the upper adsorption section, the smoke from the lower adsorption section adsorbs the powder activity Jiao Chuisan, so that the quantity of the sulfur oxides and the nitrogen oxides in the smoke entering the upper adsorption section is greatly reduced due to the fact that most of the sulfur oxides and the nitrogen oxides in the smoke are adsorbed by the circulating coke, and fresh powder active coke is introduced into the upper adsorption section, so that the smoke has more micropores compared with the circulating coke, has higher adsorption capacity and catalytic effect, improves the desulfurization and denitrification efficiency, can catalytically decompose redundant ozone and prevents secondary pollution; the powder active coke sequentially enters an inertial separator and a dust remover along with the flue gas and is collected as circulating coke, one part enters an upper adsorption section for denitration, and the other part enters a lower adsorption section for desulfurization.
The invention can adopt the powdery active coke to carry out desulfurization and denitration in the device. The utilization efficiency of the powder active coke is improved.
The invention further provides an ozone oxidation combined desulfurization and denitrification method, which comprises an ozone generating device, an active coke feeding device, an inertial separator, a dust remover and a vertically-arranged fluidized bed reactor, wherein the fluidized bed reactor sequentially comprises a lower adsorption section and an upper adsorption section from bottom to top, an inner member for preventing powder active coke in the upper adsorption section from entering the lower adsorption section is arranged in the fluidized bed reactor, a reactor flue gas inlet pipe is arranged at the bottom of the lower adsorption section, a reactor flue gas outlet pipe is arranged at the upper part of the upper adsorption section, the diameter of the reactor inlet pipe is smaller than the diameter of a pipe body of the lower adsorption section, an annular groove is formed between the reactor inlet pipe and the pipe wall of the lower adsorption section, and a spent coke outlet is arranged at the bottom of the annular groove;
the ozone generating device sprays ozone into the flue gas in the inlet pipe of the reactor, and the mixture of the ozone and the flue gas enters the lower adsorption section;
in the lower adsorption section, the circulating coke from the inertial separator and the dust remover pre-adsorbs sulfur oxide compounds and nitrogen dioxide in the flue gas to achieve the aim of pre-desulfurization and denitrification, and then ozone takes the rest part of nitric oxide as nitrogen dioxide under the catalysis of the circulating coke to promote the adsorption of the circulating coke on the nitrogen oxide; meanwhile, in the process that the flue gas carries circulating coke to flow upwards, most of spent coke for absorbing sulfur oxides and carbon dioxide is blown to the pipe wall of the lower absorption section, and then falls into the annular groove along the pipe wall of the lower absorption section, so that the spent coke in the lower absorption section is discharged;
in the upper adsorption section, the powder active coke further adsorbs and removes nitrogen oxides and sulfur oxides in the flue gas, and carries out catalytic decomposition on redundant ozone carried in the flue gas, and then the powder active coke after adsorbing the nitrogen oxides and the sulfur oxides sequentially enters an inertial separator and a dust remover along with the flue gas to be separated to form circulating coke, and the circulating coke is respectively added into the upper adsorption section and the lower adsorption section.
It is a further object of the present invention to provide an application of the above device or method in the field of coal-fired power generation.
The beneficial effects of the invention are as follows:
1. the invention adopts ozone to oxidize nitric oxide into nitrogen dioxide, and the nitrogen dioxide is removed by the adsorption of active coke.
2. The invention adopts the powdery active coke to realize the adsorption and purification of sulfur dioxide and nitrogen oxides simultaneously under the fluidization condition.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.
FIG. 1 is a schematic view of the structure of the device of the present invention;
wherein, 1, jiao Chucang, 2, jiao Geiliao, 3, upper adsorption section, 4, inner member, 5, lower adsorption section, 6, spent coke discharge feed, 7, ozone generator, 8, reactor flue gas inlet pipe, 9, cycle Jiao Geiliao, 10, bag-type dust collector.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The particle size of the powder active coke is smaller than 1mm.
As introduced by the background technology, the defect that the flue gas treated by the powder active coke is difficult to realize simultaneous removal of sulfur dioxide and nitrogen oxides exists in the prior art, and in order to solve the technical problems, the application provides a device and a method for desulfurization and denitrification by combining double circulation of the powder active coke and ozone oxidation.
According to an exemplary embodiment of the application, an ozone oxidation combined desulfurization and denitrification device is provided, and the device comprises a fluidized bed reactor, an ozone generating device, an active coke feeding device, an inertial separator and a dust remover, wherein the fluidized bed reactor is vertically arranged, an inner member is arranged in the fluidized bed reactor to divide the fluidized bed reactor into an upper adsorption section and a lower adsorption section, a reactor flue gas inlet pipe is arranged at the bottom of the lower adsorption section, a reactor flue gas outlet pipe is arranged at the upper part of the upper adsorption section, ozone is sprayed into the reactor flue gas inlet pipe by the ozone generating device, and powder active coke is provided for the upper adsorption section by the active Jiao Geiliao device; the flue gas sequentially enters a lower adsorption section and an upper adsorption section of the fluidized bed reactor after being mixed with ozone in a flue gas inlet pipe of the reactor, then sequentially enters an inertial separator and a dust remover after being discharged from a flue gas outlet pipe of the reactor, a circulation Jiao Geiliao component is arranged at the bottoms of the inertial separator and the dust remover, and a circulation Jiao Geiliao component conveys part of circulating coke separated by the inertial separator and the dust remover to the upper adsorption section and the other part of circulating coke to the lower adsorption section;
the inner member is a component which can allow the flue gas of the lower adsorption section to enter the upper adsorption section and prevent active coke in the upper adsorption section from entering the lower adsorption section, such as a check valve and the like;
the diameter of the reactor inlet pipe is smaller than that of the pipe body of the lower adsorption section, the reactor inlet pipe and the pipe wall of the lower adsorption section form an annular groove, and a spent coke outlet is arranged at the bottom of the annular groove.
The flue gas is mixed with ozone in the inlet pipe of the reactor, so that part of nitric oxide is oxidized into nitrogen dioxide, and then enters the lower adsorption section. In the lower adsorption section, the circulating coke from the inertial separator and the dust remover pre-adsorbs sulfur oxide compounds and nitrogen dioxide in the flue gas to achieve the purpose of pre-desulfurization and denitrification, and then ozone takes the rest part of nitric oxide as nitrogen dioxide under the catalysis of the circulating coke to promote the adsorption of the circulating coke on the nitrogen oxide; simultaneously, in the process that the flue gas carries circulating coke to flow upwards, most of spent coke for absorbing sulfur oxides and carbon dioxide is blown to the pipe wall of the lower absorption section, and then falls into the annular groove along the pipe wall of the lower absorption section, so that the spent coke in the lower absorption section is discharged. In the upper adsorption section, the smoke from the lower adsorption section adsorbs the powder activity Jiao Chuisan, so that the quantity of the sulfur oxides and the nitrogen oxides in the smoke entering the upper adsorption section is greatly reduced due to the fact that most of the sulfur oxides and the nitrogen oxides in the smoke are adsorbed by the circulating coke, and fresh powder active coke is introduced into the upper adsorption section, so that the smoke has more micropores compared with the circulating coke, has higher adsorption capacity and catalytic effect, improves the desulfurization and denitrification efficiency, can catalytically decompose redundant ozone and prevents secondary pollution; the powder active coke sequentially enters an inertial separator and a dust remover along with the flue gas and is collected as circulating coke, one part enters an upper adsorption section for denitration, and the other part enters a lower adsorption section for desulfurization.
The invention can adopt the powdery active coke to carry out desulfurization and denitration in the device. The utilization efficiency of the powder active coke is improved.
Since the powder activated coke is light in weight and is easily carried away by flue gas, it is preferable that the activated Jiao Geiliao device is provided in the upper adsorption section at the middle lower part thereof at the feed outlet. The utilization efficiency of the powder active coke is improved.
Preferably, the dust remover is a cloth bag dust remover. In the dust removing process of the bag-type dust remover, the activity Jiao Lvceng is continuously formed and updated on the surface of the filter material, and the filter layer has certain desulfurization capability. The separated active coke has higher utilization rate than the active coke separated by the circulating coke inertial separator.
Preferably, the circulating coke separated by the inertial separator is conveyed to the upper adsorption section, and the circulating coke separated by the dust remover is conveyed to the lower adsorption section.
Preferably, the separation efficiency of the inertial separator is not higher than 90%.
Preferably, the bottom pipe wall of the lower adsorption section is of a diameter-reducing structure from top to bottom. And the spent coke is convenient to collect.
Preferably, the annular groove is provided with a collecting plate.
Preferably, the spent coke outlet is provided with a gate valve.
Preferably, the spent coke outlet is provided with a gas locking feeder. Preventing the leakage of smoke.
The utility model provides a method of combined desulfurization and denitrification of ozone oxidation, provides ozone generating device, active burnt feeder, inertial separator, dust remover and the fluidized bed reactor of vertical setting up, the fluidized bed reactor from bottom to top includes lower adsorption section and upper adsorption section in proper order, be equipped with the internals that prevent the powder active burnt in the upper adsorption section from getting into the lower adsorption section in the fluidized bed reactor, the lower adsorption section bottom is equipped with the reactor flue gas inlet tube, upper adsorption section upper portion is equipped with the reactor flue gas outlet tube, the diameter of reactor inlet tube is less than the body diameter of lower adsorption section, reactor inlet tube and lower adsorption section pipe wall form the ring channel, the ring channel bottom is equipped with the spent coke export;
the ozone generating device sprays ozone into the flue gas in the inlet pipe of the reactor, and the mixture of the ozone and the flue gas enters the lower adsorption section;
in the lower adsorption section, the circulating coke from the inertial separator and the dust remover pre-adsorbs sulfur oxide compounds and nitrogen dioxide in the flue gas to achieve the aim of pre-desulfurization and denitrification, and then ozone takes the rest part of nitric oxide as nitrogen dioxide under the catalysis of the circulating coke to promote the adsorption of the circulating coke on the nitrogen oxide; meanwhile, in the process that the flue gas carries circulating coke to flow upwards, most of spent coke for absorbing sulfur oxides and carbon dioxide is blown to the pipe wall of the lower absorption section, and then falls into the annular groove along the pipe wall of the lower absorption section, so that the spent coke in the lower absorption section is discharged;
in the upper adsorption section, the powder active coke further adsorbs and removes nitrogen oxides and sulfur oxides in the flue gas, and carries out catalytic decomposition on redundant ozone carried in the flue gas, and then the powder active coke after adsorbing the nitrogen oxides and the sulfur oxides sequentially enters an inertial separator and a dust remover along with the flue gas to be separated to form circulating coke, and the circulating coke is respectively added into the upper adsorption section and the lower adsorption section.
Preferably, the activated Jiao Geiliao device delivers powdered activated coke to the middle lower portion of the upward adsorption section.
Preferably, the dust remover is a cloth bag dust remover.
Preferably, the circulating coke separated by the inertial separator is conveyed to the upper adsorption section, and the circulating coke separated by the dust remover is conveyed to the lower adsorption section.
Preferably, the separation efficiency of the inertial separator is not higher than 90%.
Preferably, the molar ratio of nitrogen oxide to ozone in the flue gas is (2-3): 1.
Preferably, every 1m 3 The mass of the powdery active coke sprayed in the flue gas is 50-500 g.
Preferably, the circulating coke conveyed to the upper adsorption section is 20-30% of the total circulating coke mass, and the circulating coke conveyed to the lower adsorption section is 70-80% of the total circulating coke mass.
In a third set of embodiments of the present application, there is provided the use of the apparatus or method described above in the field of coal-fired power generation.
In order to enable those skilled in the art to more clearly understand the technical solutions of the present application, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
The device comprises a fluidized bed reactor, an ozone generating device 7, an active coke feeding device, an inertial separator and a bag-type dust collector 10, wherein the fluidized bed reactor is vertically arranged, an inner member 4 is arranged in the fluidized bed reactor to divide the fluidized bed reactor into an upper adsorption section 3 and a lower adsorption section 5, a reactor flue gas inlet pipe 8 is arranged at the bottom of the lower adsorption section 5, a reactor flue gas outlet pipe is arranged at the upper part of the upper adsorption section 3, ozone is sprayed into the reactor flue gas inlet pipe 8 by the ozone generating device 7, the active coke feeding device comprises an active coke storage bin 1 and an active Jiao Geiliao component 2, and the active Jiao Geiliao component provides powdered active coke in the active coke storage bin 1 to the upper adsorption section 3; the flue gas sequentially enters a lower adsorption section 5 and an upper adsorption section 3 of the fluidized bed reactor after being mixed with ozone in a flue gas inlet pipe 8 of the reactor, then sequentially enters an inertial separator and a cloth bag dust remover 10 after being discharged from a flue gas outlet pipe of the reactor, a circulation Jiao Geiliao component 9 is arranged at the bottoms of the inertial separator and the cloth bag dust remover 10, the circulation Jiao Geiliao component 9 conveys part of circulating coke separated by the inertial separator and the cloth bag dust remover 10 to the upper adsorption section 3, and the other part of circulating coke is conveyed to the lower adsorption section 5;
the inner member 4 is a component capable of allowing the flue gas of the lower adsorption section 5 to enter the upper adsorption section 3 and preventing active coke in the upper adsorption section 3 from entering the lower adsorption section 5, such as a check valve and the like;
the diameter of the reactor inlet pipe 8 is smaller than that of the pipe body of the lower adsorption section 5, the reactor inlet pipe 8 and the pipe wall of the lower adsorption section form an annular groove, and a spent coke outlet is arranged at the bottom of the annular groove.
The active coke feeding device is arranged at the middle lower part of the upper adsorption section 3 at the feeding outlet in the upper adsorption section 3.
The circulating coke separated by the inertial separator is conveyed to the upper adsorption section 3, and the circulating coke separated by the bag-type dust collector 8 is conveyed to the lower adsorption section 6.
The separation efficiency of the inertial separator is not higher than 90%.
The bottom pipe wall of the lower adsorption section 5 is of a diameter-reducing structure from top to bottom.
The annular groove is provided with a collecting plate. The spent coke outlet is provided with a spent coke discharging and feeding assembly 6, and the spent coke discharging and feeding assembly 6 comprises a gate valve and a gas locking feeder.
The process comprises the following steps:
the ozone generating device sprays ozone into the flue gas in the inlet pipe of the reactor, and the mixture of the ozone and the flue gas enters the lower adsorption section.
In the lower adsorption section, the circulating coke from the inertial separator and the dust remover pre-adsorbs sulfur oxide compounds and nitrogen dioxide in the flue gas to achieve the aim of pre-desulfurization and denitrification, and then ozone takes the rest part of nitric oxide as nitrogen dioxide under the catalysis of the circulating coke to promote the adsorption of the circulating coke on the nitrogen oxide; simultaneously, in the process that the flue gas carries circulating coke to flow upwards, most of spent coke for absorbing sulfur oxides and carbon dioxide is blown to the pipe wall of the lower absorption section, and then falls into the annular groove along the pipe wall of the lower absorption section, so that the spent coke in the lower absorption section is discharged.
In the upper adsorption section, the powder active coke further adsorbs and removes nitrogen oxides and sulfur oxides in the flue gas, and carries out catalytic decomposition on redundant ozone carried in the flue gas, and then the powder active coke after adsorbing the nitrogen oxides and the sulfur oxides sequentially enters an inertial separator and a dust remover along with the flue gas to be separated to form circulating coke, and the circulating coke is respectively added into the upper adsorption section and the lower adsorption section.
Wherein the molar ratio of the nitrogen oxide to the ammonia in the flue gas is (2-3): 1.
Every 1m 3 The mass of the powdery active coke sprayed in the flue gas is 50-500 g.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (8)

1. The device is characterized by comprising a fluidized bed reactor, an ozone generating device, an active coke feeding device, an inertial separator and a dust remover, wherein the fluidized bed reactor is vertically arranged, an inner member is arranged in the fluidized bed reactor to divide the fluidized bed reactor into an upper adsorption section and a lower adsorption section, a reactor flue gas inlet pipe is arranged at the bottom of the lower adsorption section, a reactor flue gas outlet pipe is arranged at the upper part of the upper adsorption section, ozone is sprayed into the reactor flue gas inlet pipe by the ozone generating device, and the active Jiao Geiliao device provides powdered active coke for the upper adsorption section; the flue gas sequentially enters a lower adsorption section and an upper adsorption section of the fluidized bed reactor after being mixed with ozone in a flue gas inlet pipe of the reactor, then sequentially enters an inertial separator and a dust remover after being discharged from a flue gas outlet pipe of the reactor, a circulation Jiao Geiliao component is arranged at the bottoms of the inertial separator and the dust remover, a circulation Jiao Geiliao component conveys powder active coke separated by the inertial separator to the upper adsorption section, and powder active coke separated by the dust remover is conveyed to the lower adsorption section;
the inner member is a check valve, so that the flue gas of the lower adsorption section can be allowed to enter the upper adsorption section, and the powder active coke in the upper adsorption section is prevented from entering the lower adsorption section;
the diameter of the reactor inlet pipe is smaller than that of the pipe body of the lower adsorption section, an annular groove is formed between the reactor inlet pipe and the pipe wall of the lower adsorption section, and a spent coke outlet is arranged at the bottom of the annular groove;
the active Jiao Geiliao device is characterized in that a feeding outlet in the upper adsorption section is arranged at the middle lower part of the upper adsorption section.
2. The apparatus of claim 1, wherein the dust collector is a bag-type dust collector.
3. The device of claim 1, wherein the bottom pipe wall of the lower adsorption section is of a diameter-reducing structure from top to bottom;
or the annular groove is provided with a collecting plate.
4. The apparatus of claim 1, wherein the spent coke outlet is provided with a gate valve and the spent coke outlet is provided with a gas-locking feeder.
5. The method for combined desulfurization and denitrification by ozone oxidation is characterized by providing an ozone generating device, an active coke feeding device, an inertial separator, a dust remover and a vertically-arranged fluidized bed reactor, wherein the fluidized bed reactor sequentially comprises a lower adsorption section and an upper adsorption section from bottom to top, an inner member for preventing powder active coke in the upper adsorption section from entering the lower adsorption section is arranged in the fluidized bed reactor, and the inner member is a check valve; the bottom of the lower adsorption section is provided with a reactor flue gas inlet pipe, the upper part of the upper adsorption section is provided with a reactor flue gas outlet pipe, the diameter of the reactor inlet pipe is smaller than that of the pipe body of the lower adsorption section, the reactor inlet pipe and the pipe wall of the lower adsorption section form an annular groove, and the bottom of the annular groove is provided with a spent coke outlet;
the ozone generating device sprays ozone into the flue gas in the inlet pipe of the reactor, and the mixture of the ozone and the flue gas enters the lower adsorption section;
in the lower adsorption section, the circulating coke from the inertial separator and the dust remover pre-adsorbs sulfur oxide compounds and nitrogen dioxide in the flue gas to achieve the aim of pre-desulfurization and denitrification, and then ozone takes the rest part of nitric oxide as nitrogen dioxide under the catalysis of the circulating coke to promote the adsorption of the circulating coke on the nitrogen oxide; meanwhile, in the process that the flue gas carries circulating coke to flow upwards, most of spent coke for absorbing sulfur oxides and carbon dioxide is blown to the pipe wall of the lower absorption section, and then falls into the annular groove along the pipe wall of the lower absorption section, so that the spent coke in the lower absorption section is discharged;
in the upper adsorption section, the powder active coke further adsorbs and removes nitrogen oxides and sulfur oxides in the flue gas, and carries out catalytic decomposition on redundant ozone carried in the flue gas, then the powder active coke after adsorbing the nitrogen oxides and the sulfur oxides sequentially enters an inertial separator and a dust remover along with the flue gas to be separated to form circulating coke, the circulating coke separated by the inertial separator is conveyed to the upper adsorption section, and the circulating coke separated by the dust remover is conveyed to the lower adsorption section;
the activity Jiao Geiliao device conveys the powder active coke to the middle lower part of the upper adsorption section.
6. The method of claim 5, wherein the dust collector is a bag-type dust collector.
7. The method of claim 5, wherein the inertial separator has a separation efficiency of no more than 90%;
or the molar ratio of the nitrogen oxide to the ozone in the flue gas is 1:1-1.1;
or, every 1m 3 The mass of the powdery active coke sprayed in the flue gas is 50-500 g;
or the circulating coke conveyed to the upper adsorption section is 20-30% of the total circulating coke mass, and the circulating coke conveyed to the lower adsorption section is 70-80% of the total circulating coke mass.
8. Use of the apparatus of any one of claims 1 to 4 or the method of any one of claims 5 to 7 in the field of coal-fired power generation.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5378443A (en) * 1992-01-03 1995-01-03 A. Ahlstrom Corporation Method for reducing emissions when burning nitrogen containing fuels
WO2009087100A1 (en) * 2008-01-11 2009-07-16 Von Roll Umwelttechnik Ag Method for purifying exhaust gases
CN104107627A (en) * 2014-07-21 2014-10-22 中国科学院过程工程研究所 Device and method for cooperative desulfurization, denitration, demercuration and dioxin removal of sintering flue gas by virtue of circulating fluidized bed semidry method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5378443A (en) * 1992-01-03 1995-01-03 A. Ahlstrom Corporation Method for reducing emissions when burning nitrogen containing fuels
WO2009087100A1 (en) * 2008-01-11 2009-07-16 Von Roll Umwelttechnik Ag Method for purifying exhaust gases
CN104107627A (en) * 2014-07-21 2014-10-22 中国科学院过程工程研究所 Device and method for cooperative desulfurization, denitration, demercuration and dioxin removal of sintering flue gas by virtue of circulating fluidized bed semidry method

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