CN114763909A - Boiler system of circulating fluidized bed coupling ion waterfall - Google Patents
Boiler system of circulating fluidized bed coupling ion waterfall Download PDFInfo
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- CN114763909A CN114763909A CN202110050473.2A CN202110050473A CN114763909A CN 114763909 A CN114763909 A CN 114763909A CN 202110050473 A CN202110050473 A CN 202110050473A CN 114763909 A CN114763909 A CN 114763909A
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- dust removal
- flue gas
- ion waterfall
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- 230000008878 coupling Effects 0.000 title description 3
- 238000010168 coupling process Methods 0.000 title description 3
- 238000005859 coupling reaction Methods 0.000 title description 3
- 239000000428 dust Substances 0.000 claims abstract description 274
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 182
- 150000002500 ions Chemical class 0.000 claims abstract description 150
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 146
- 239000003546 flue gas Substances 0.000 claims abstract description 146
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 113
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 94
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 94
- 239000003054 catalyst Substances 0.000 claims abstract description 62
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 50
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 48
- 230000023556 desulfurization Effects 0.000 claims abstract description 44
- 230000002745 absorbent Effects 0.000 claims description 73
- 239000002250 absorbent Substances 0.000 claims description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 239000000443 aerosol Substances 0.000 claims description 24
- 239000007921 spray Substances 0.000 claims description 23
- 238000005406 washing Methods 0.000 claims description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 239000000779 smoke Substances 0.000 claims description 11
- 239000010419 fine particle Substances 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 9
- 238000002955 isolation Methods 0.000 claims description 8
- 239000006028 limestone Substances 0.000 claims description 6
- 235000019738 Limestone Nutrition 0.000 claims description 5
- 238000004064 recycling Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000004566 building material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011044 inertial separation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- 239000002918 waste heat Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
-
- 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
- B01D53/14—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 absorption
- B01D53/1456—Removing acid components
- B01D53/1475—Removing carbon dioxide
-
- 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
- B01D53/14—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 absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
-
- 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
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J11/00—Devices for conducting smoke or fumes, e.g. flues
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Combustion & Propulsion (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention provides a boiler system of a circulating fluidized bed coupled with an ion waterfall, which relates to the technical field of coal-fired boilers and comprises: circulating fluidized bed boiler and flue are provided with in the flue: the device comprises a preposed dust removal and collection unit, a first ion waterfall dust removal unit, a second ion waterfall dust removal unit, a desulfurization unit, a denitration SCR catalyst unit, an air preheating unit, a carbon dioxide capturing unit and a demisting and ammonia capturing unit; the denitration SCR device comprises a first ion waterfall dust removal unit, a denitration SCR catalyst unit, a second ion waterfall dust removal unit and an air preheating unit, wherein the first ion waterfall dust removal unit, the denitration SCR catalyst unit, the second ion waterfall dust removal unit and the air preheating unit are distributed in a shape like a Chinese character ji, the denitration SCR catalyst unit is positioned at the top of the shape like a Chinese character ji and is vertically arranged along the horizontal direction, and the first ion waterfall dust removal unit, the second ion waterfall dust removal unit and the air preheating unit are respectively positioned on two sides of the shape like a Chinese character ji. The boiler system disclosed by the invention applies an ion waterfall dust removal means to flue gas dust removal, and a denitration SCR catalyst unit is not blocked, so that efficient denitration is realized. The ion waterfall dust removal means is not influenced by the specific resistance of dust, and the dust removal efficiency is high.
Description
Technical Field
The invention relates to the technical field of coal-fired boilers, in particular to a boiler system with a circulating fluidized bed coupled with ion waterfalls.
Background
Circulating fluidized bed coal fired boilers are widely used in coal-fired power plants, and with the gradual improvement of national environmental protection emission standards of thermal power plants, most of the existing circulating fluidized bed coal fired boilers adopt SCR denitration technology, and adopt electrostatic dust removal or cloth bag dust removal or electrostatic and cloth bag combined dust removal after the boiler and limestone-gypsum wet desulphurization technology to achieve emission standard.
However, in the denitration technology, the SCR catalyst is in high-dust smoke, so that the honeycomb SCR catalyst is easy to block. And dust removal behind the boiler, relevant equipment of desulfurization take up an area of greatly, and the waste water treatment is difficult after the desulfurization, and the system is complicated, and the flue gas resistance is big to in order to avoid boiler air heater's corruption, the exhaust gas temperature of boiler is high, and boiler efficiency is difficult to improve again.
At present, a high-temperature-resistant electrostatic dust collector is adopted before denitration, but the technical scheme has large occupied area and occupied space volume and high requirements on manufacturing, installation and operation levels, and because the high-temperature electrostatic dust collector has a complex structure, a plurality of control points and high automation degree, the high-temperature electrostatic dust collector has high requirements on manufacturing quality, installation precision and operation, otherwise, the expected dust removal effect cannot be achieved. In addition, the high-temperature resistant electrostatic dust collector is most sensitive to the specific resistance of dust, and when the specific resistance of the dust is too high or too low, the dust collection efficiency of the high-temperature resistant electrostatic dust collector is reduced.
Therefore, there is a need to provide a boiler system that removes dust before denitration and has dust removal efficiency that is not affected by dust specific resistance.
Disclosure of Invention
In view of the above problems, the present invention provides a boiler system with a circulating fluidized bed coupled with an ion waterfall, which removes dust before denitration, has dust removal efficiency not affected by dust specific resistance, and has standard smoke emission.
The embodiment of the invention provides a boiler system for coupling circulating fluidized bed with ion waterfall, which comprises: circulating fluidized bed boiler and flue, be provided with in the flue: the device comprises a preposed dust removal and collection unit, a first ion waterfall dust removal unit, a second ion waterfall dust removal unit, a desulfurization unit, a denitration SCR catalyst unit, an air preheating unit, a carbon dioxide capturing unit and a demisting and ammonia capturing unit;
the pre-dedusting collection unit is arranged at the downstream of the economizer, the flue gas in the economizer flows into the pre-dedusting collection unit, the pre-dedusting collection unit performs primary dedusting on the flue gas, the flue gas after the primary dedusting flows to the first ion waterfall dedusting unit, and meanwhile, the pre-dedusting collection unit collects dust obtained by the primary dedusting;
A desulfurization absorbent nozzle is arranged in the desulfurization unit and positioned between the preposed dust removal and collection unit and the first ion waterfall dust removal unit, the desulfurization absorbent nozzle sprays desulfurization absorbent to desulfurize the flue gas subjected to the first dust removal, and the desulfurized flue gas flows into the first ion waterfall dust removal unit;
the first ion waterfall dust removal unit removes dust for the second time on the desulfurized flue gas, and the flue gas after dust removal for the second time flows to the denitration SCR catalyst unit;
a denitration absorbent nozzle is arranged at the downstream of the first ion waterfall dust removal unit, the denitration absorbent nozzle sprays denitration absorbent to the flue gas subjected to secondary dust removal, and the flue gas containing the denitration absorbent flows into the denitration SCR catalyst unit;
the denitration SCR catalyst unit purifies the flue gas containing the denitration absorbent, and the purified flue gas flows to the second ion waterfall dust removal unit;
the second ion waterfall dust removal unit removes dust for the third time on the purified flue gas, and the flue gas after the third dust removal flows to the air preheating unit;
the air preheating unit cools the flue gas subjected to the third dust removal, and the cooled flue gas flows to the carbon dioxide capturing unit;
The carbon dioxide capturing unit is used for capturing carbon of the cooled flue gas, and the flue gas subjected to carbon capture flows to the demisting and ammonia capturing unit;
the demisting and ammonia capturing unit is used for removing aerosol and capturing ammonia escape from the carbon-captured flue gas, and the flue gas after the aerosol is removed and the ammonia escape is captured flows to a chimney of the boiler system;
the first ion waterfall dust removal unit, the denitration SCR catalyst unit, the second ion waterfall dust removal unit and the air preheating unit are distributed in a shape like a Chinese character ji, the denitration SCR catalyst unit is positioned at the top of the shape like the Chinese character ji and is vertically arranged along the horizontal direction, the first ion waterfall dust removal unit is positioned at one side of the shape like the Chinese character ji close to the circulating fluidized bed boiler, and the second ion waterfall dust removal unit and the air preheating unit are positioned at one side of the shape like the Chinese character ji close to the chimney.
Optionally, the denitration SCR catalyst unit comprises: a plurality of SCR catalyst screens;
each of the plurality of SCR catalyst screens includes: the device comprises a rectangular box body consisting of a stainless steel wire net, a connecting rod and a fastener, wherein the rectangular box body is filled with a honeycomb SCR catalyst.
Optionally, the respective power supply device and rapping device of the first ion waterfall dust removal unit and the second ion waterfall dust removal unit are arranged at the top of the zigzag.
Optionally, the first ion waterfall dust removal unit includes: the first ion waterfall dust remover group is positioned above the first dust collecting hopper;
the second ion waterfall dust removal unit comprises: the second ion waterfall dust remover group is positioned above the air preheating unit;
the air preheating unit is positioned above the second ash collecting hopper;
each ion waterfall dust remover in the first ion waterfall dust remover group is provided with an isolation cover, and one side of the isolation cover facing the first ash collecting hopper is provided with an opening;
and each ion waterfall dust remover in the second ion waterfall dust remover group is provided with an isolation cover, and the isolation cover surface is opened towards one surface of the air preheating unit.
Optionally, the front dust removal collection unit includes: the inertia dust remover, the third ash collecting hopper and the water seal scraper ash remover;
the inertial dust collector is positioned above the third dust collecting hopper, and is used for carrying out primary dust collection on the flue gas flowing into the preposed dust collection unit, and the collected dust falls into the first dust collecting hopper;
The third dust collecting hopper is located above the water seal scraper ash remover, and the water seal scraper ash remover removes dust falling into the third dust collecting hopper.
Optionally, the carbon dioxide capture unit comprises: a carbon dioxide washing absorption tower, a carbon dioxide absorbent circulating box and a new carbon dioxide absorbent box;
the carbon dioxide washing and absorbing tower is respectively connected with the carbon dioxide absorbent circulating box and the fresh carbon dioxide absorbent box, the fresh carbon dioxide absorbent box provides a fresh carbon dioxide absorbent, and the carbon dioxide absorbent circulating box is used for recycling the carbon dioxide absorbent;
and the carbon dioxide washing and absorbing tower carries out carbon capture on the cooled flue gas based on the circulation of the new carbon dioxide absorbent and the carbon dioxide absorbent to capture carbon dioxide.
Optionally, the demisting and ammonia capture unit comprises: a demister, an ion waterfall demister and a water spray catching ammonia escape device;
the demister is positioned above the carbon dioxide washing and absorbing tower;
the ion waterfall demister is positioned above the demister;
the water spray catching ammonia escaper is positioned above the ion waterfall demister;
The demister is used for collecting fine particles of the flue gas after the carbon capture, and the flue gas after the fine particles are collected flows to the ion waterfall demister;
the ion waterfall demister removes aerosol from the flue gas after the fine particles are collected, and the flue gas after the aerosol is removed flows to the water spray catching ammonia escaper;
the water spray ammonia catching escaper catches ammonia escaping from the smoke after the aerosol is removed, and the smoke after the ammonia escaping is caught and flows to the chimney.
Optionally, the flue is further provided with: an induced draft fan;
the draught fan is located the air preheating unit with between the carbon dioxide capture unit, the draught fan will flue gas after the cooling is introduced the carbon dioxide capture unit.
Optionally, the flue is further provided with: a carbon dioxide and ammonia gas detection device;
the carbon dioxide and ammonia gas detection device is positioned between the flue and the chimney;
and the carbon dioxide and ammonia gas detection device detects the content of carbon dioxide and the content of ammonia gas in the flue gas after the aerosol removal and the ammonia capture escape.
Optionally, performing primary desulfurization based on limestone inside the circulating fluidized bed boiler;
The inside of the circulating fluidized bed boiler is subjected to preliminary denitration based on SNCR.
According to the boiler system provided by the invention, an ion waterfall dust removal means is creatively applied to flue gas dust removal, before denitration, the flue gas is subjected to dust removal by using the preposed dust removal collection unit and the first ion waterfall dust removal unit, and desulfuration is performed based on the desulfuration unit, so that a denitration SCR (selective catalytic reduction) catalyst unit is not blocked, and efficient denitration is realized. And because the ion waterfall dust removal means is not influenced by the specific resistance of dust, the dust removal efficiency is high.
After SCR denitration, utilize second ion waterfall dust removal unit to remove dust the flue gas once more, because the desulfurization has been accomplished, so dew point corrosion can not appear in the air preheating unit, and the flue gas temperature of boiler outlet can set up lowly, has reduced the boiler and has discharged fume the loss, has improved boiler combustion efficiency. The carbon dioxide capturing unit and the demisting and ammonia capturing unit capture carbon dioxide, remove aerosol and capture ammonia escape, so that the flue gas finally reaches the emission standard.
Drawings
Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic diagram of a unitized construction of a boiler system according to an embodiment of the present invention
FIG. 2 is a schematic diagram of a preferred configuration of a boiler system according to an embodiment of the present invention.
FIG. 2 is a drawing showing reference numerals:
1-limestone, 2-circulating fluidized bed boiler, 3-SNCR denitration equipment, 4-inertial dust remover, 5-third ash collecting hopper, 6-water seal scraper ash remover, 7-desulphurization absorbent nozzle, 8-first ion cascade dust remover group, 9-denitration absorbent nozzle, 10-SCR denitration catalyst screen, 11-first power supply device and rapping device, 12-second ion cascade dust remover group, 13-air preheater, 14-induced draft fan, 15-carbon dioxide washing absorption tower, 16-demister, 17-ion cascade demister, 18-water spray capture ammonia escape, 19-carbon dioxide and ammonia gas detection device, 20-chimney, 21-carbon dioxide absorbent circulating box, 22-new carbon dioxide absorbent box, 23-a first hopper, 24-a second hopper, 25-a second power supply device and a rapping device.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention, but do not limit the invention to only some, but not all embodiments.
Fig. 1 is a schematic diagram of a unitized structure of a boiler system according to an embodiment of the present invention, where the boiler system includes: circulating fluidized bed boiler 100 and flue 200 are provided with in the flue 200: the system comprises a preposed dust removal collection unit 2001, a first ion waterfall dust removal unit 2002, a second ion waterfall dust removal unit 2003, a desulfurization unit 2004, a denitration SCR catalyst unit 2005, an air preheating unit 2006, a carbon dioxide capture unit 2007 and a demisting and ammonia capture unit 2008. It should be noted that, at present, the circulating fluidized bed boiler 100 can perform in-furnace desulfurization and denitration, generally, limestone is used for in-furnace desulfurization, and SNCR technology is used for in-furnace denitration, so that flue gas generated by the boiler can realize primary denitration and desulfurization, the flue gas subjected to primary denitration and desulfurization flows to the chimney 300 along the flue, and at first, the flue gas flows to the economizer 2009.
In the embodiment of the present invention, the pre-dust-removal collecting unit 2001 is disposed downstream of the economizer 2009, the flue gas in the economizer 2009 flows into the pre-dust-removal collecting unit 2001, the pre-dust-removal collecting unit 2001 performs primary dust removal on the flue gas after the primary denitration and desulfurization, the flue gas after the primary dust removal flows to the first ion waterfall dust-removal unit 2002, and meanwhile, the pre-dust-removal collecting unit 2001 further collects dust obtained by the primary dust removal. The pre-dedusting collection unit 2001 can remove larger particles of dust (e.g., dust of 20 μm or more) in the flue gas, so as to reduce the dedusting load of the first ion cascade dedusting unit 2002. In addition, the dust collected by the pre-dust collection unit 2001 can be sent to manufacture cement and other products, so as to achieve the effect of comprehensive utilization.
The desulfurization unit 2004 is provided with a desulfurization absorbent nozzle, the desulfurization absorbent nozzle is located between the pre-dust removal collection unit 2001 and the first ion waterfall dust removal unit 2002, the desulfurization absorbent nozzle can spray a desulfurization absorbent, the desulfurization absorbent can further desulfurize the flue gas subjected to primary dust removal, the desulfurized flue gas basically realizes the current flue gas desulfurization, the sulfur content in the flue gas reaches the standard, and the flue gas with the sulfur content reaching the standard flows into the first ion waterfall dust removal unit 2002.
The first ion waterfall dust removal unit 2002 removes dust for the second time on the desulfurized flue gas, and the flue gas after dust removal for the second time flows to the denitration SCR catalyst unit 2005. Because the denitration absorbent nozzle 2010 is arranged at the downstream of the first ion waterfall dust removal unit, the denitration absorbent nozzle 2010 can spray a denitration absorbent, that is, the denitration absorbent nozzle 2010 sprays the denitration absorbent to the flue gas after the second dust removal, the flue gas containing the denitration absorbent flows into the denitration SCR catalyst unit 2005, and the denitration SCR catalyst unit 2005 can denitrate the flue gas containing the denitration absorbent again by means of the SCR catalyst.
The denitration SCR catalyst unit 2005 purifies (i.e., denitrates) flue gas by using an SCR technology, the nitrate content of the purified flue gas reaches the denitration standard, and the flue gas having the nitrate content up to the standard flows to the second ion waterfall dust removal unit 2003. The second ion waterfall dust removal unit 2003 removes dust for the third time on the purified flue gas, and the flue gas after the third dust removal flows to the air preheating unit 2006. The air preheating unit 2006 cools the flue gas after dust removal for the third time, and because the sulfur content in the flue gas reaches the standard, the desulfurization is completed, so the dew point corrosion problem can not appear in the air preheating unit 2006. Because the air preheating unit 2006 does not have the dew point corrosion problem, the smoke temperature of the flue gas at the outlet of the boiler can be designed to be lower (the preferable temperature is 50-60 ℃), so that the smoke exhaust loss of the boiler is reduced, and the combustion efficiency of the boiler is improved. The flue gas cooled by the air preheating unit 2006 flows to the carbon dioxide capturing unit 2007.
In the embodiment of the present invention, the first ion waterfall dust removal unit 2002, the denitration SCR catalyst unit 2005, the second ion waterfall dust removal unit 2003, and the air preheating unit 2006 are distributed in a zigzag shape, and the reason for the zigzag distribution is described below and will not be described again. It will be appreciated that, since the units are disposed in the flue, the flue must be shaped in a zigzag manner in order to be distributed in a zigzag manner. The denitration SCR catalyst unit 2005 is disposed on the top of the zigzag shape and is vertically disposed along the horizontal direction, and the reason for the vertical disposition of the denitration SCR catalyst unit 2005 is described below and will not be described again. The first ion waterfall dust removal unit 2002 is located at one side of the zigzag shape close to the circulating fluidized bed boiler 100, and the second ion waterfall dust removal unit 2003 and the air preheating unit 2006 are located at one side of the zigzag shape close to the chimney 300.
The carbon dioxide capturing unit 2007 performs carbon capture on the cooled flue gas to capture carbon dioxide. The flue gas after carbon capture flows to the demisting and ammonia capture unit 2008. The demisting and ammonia capturing unit 2008 removes the aerosol from the carbon-captured flue gas and captures the ammonia escape, the flue gas after removing the aerosol and capturing the ammonia escape finally reaches the standard of flue gas emission, and the flue gas reaching the standard of flue gas emission flows to the chimney 300 of the boiler system.
According to the boiler system provided by the embodiment of the invention, an ion waterfall dust removal means is creatively applied to flue gas dust removal, before denitration, the flue gas is subjected to dust removal by using the preposed dust removal collection unit and the first ion waterfall dust removal unit, and desulfuration is performed based on the desulfuration unit, so that a denitration SCR (selective catalytic reduction) catalyst unit is not blocked, and efficient denitration is realized. And because the ion waterfall dust removal means is not influenced by the specific resistance of dust, the dust removal efficiency is high.
After SCR denitration, the second ion waterfall dust removal unit is used again for flue gas dust removal, and because desulfurization is completed, dew point corrosion cannot occur in the air preheating unit, the flue gas temperature at the outlet of the boiler can be set to be low, the flue gas loss of the boiler is reduced, and the combustion efficiency of the boiler is improved. And the carbon dioxide capturing unit and the demisting and ammonia capturing unit capture carbon dioxide, remove aerosol and capture ammonia escape, so that the flue gas finally reaches the emission standard.
Referring to fig. 2, there is shown a schematic diagram of a preferred structure of a boiler system according to an embodiment of the present invention, the boiler system including: limestone 1, a circulating fluidized bed boiler 2, an SNCR denitration device 3, an inertial dust collector 4, a third ash collecting hopper 5, a water seal scraper ash remover 6, a desulphurization absorbent nozzle 7, a first ion waterfall dust remover group 8, a denitration absorbent nozzle 9, an SCR denitration catalyst screen 10, a first power supply device and a rapping device 11, a second ion waterfall dust remover group 12, an air preheater 13, an induced draft fan 14, a carbon dioxide washing absorption tower 15, a demister 16, an ion waterfall mist demister 17, a water spray capture ammonia escape 18, a carbon dioxide and ammonia gas detection device 19, a chimney 20, a carbon dioxide absorbent circulating box 21, a new carbon dioxide absorbent box 22, a first ash collecting hopper 23, a second ash collecting hopper 24, a second power supply device and rapping device 25, a coal economizer 26 and a separator 27. The front dust removal collection unit 2001 in fig. 1 correspondingly includes: an inertial dust collector 4, a third ash collecting hopper 5 and a water seal scraper ash remover 6; the first ion waterfall dust removal unit 2002 in fig. 1 correspondingly includes: the device comprises a first ion waterfall dust remover group 8, a first dust collecting hopper 23, a first power supply device and a rapping device 11; the second ion waterfall dust removal unit 2003 in fig. 1 correspondingly includes: a second ion waterfall dust collector group 12, a second dust collecting hopper 24, a second power supply device and a rapping device 25; the desulfurization unit 2004 in fig. 1 correspondingly includes: a desulfurization absorbent nozzle 7; the denitration SCR catalyst unit 2005 in fig. 1 correspondingly includes: an SCR denitration catalyst screen 10; the air preheating unit 2006 in fig. 1 correspondingly includes: an air preheater 13; the carbon dioxide capturing unit 2007 in fig. 1 correspondingly includes: a carbon dioxide washing absorption tower 15, a carbon dioxide absorbent circulation box 21, a new carbon dioxide absorbent box 22; the demisting and ammonia capture unit 2008 of fig. 1 correspondingly includes: a demister 16, an ion waterfall demister 17, and a water spray catch ammonia slip 18.
In the embodiment of the invention, limestone 1 is used for being put into a circulating fluidized bed boiler 2 for primary desulfurization, and an SNCR denitration device 3 is used for realizing primary denitration of an SNCR technology. The flue gas after the preliminary denitration and desulfurization flows into the economizer 26, and the flue gas flowing out of the economizer 26 flows to the inertial dust collector 4 (other inertial separation methods can be adopted), so that larger particles of dust (for example, 20 microns or more) are removed, and the dust removal load of the first ion waterfall dust collector group 8 is reduced. Meanwhile, the inertial dust collector 4 is located above the third dust collecting hopper 5, the inertial dust collector 4 carries out primary dust collection on the flue gas flowing into the front dust collecting unit 2001, the collected dust falls into the first dust collecting hopper 5, the third dust collecting hopper 5 is located above the water seal scraper ash remover 6, the water seal scraper ash remover 6 removes the dust falling into the third dust collecting hopper 5, the obtained dust can be sent to produce cement and other products, the purpose of comprehensive utilization is achieved, and in addition, a certain benefit is created for a thermal power plant.
In the process that the flue gas flowing out of the inertial dust collector 4 flows to the first ion waterfall dust collector group 8 again, the desulfurization absorbent is sprayed by the desulfurization absorbent nozzle 7 to further desulfurize the flue gas subjected to the first dust removal of the inertial dust collector 4, the desulfurized flue gas flows into the first ion waterfall dust collector group 8, and the sulfur content of the flue gas reaches the standard. The first ion waterfall dust removal group 8 removes dust for the second time to the flue gas after desulfurization, and in the flue gas after the second time removes dust and is flowing towards SCR denitration catalyst screen 10 in-process, denitration absorbent nozzle 9 sprays the denitration absorbent, and the flue gas that contains the denitration absorbent flows into SCR denitration catalyst screen 10.
The SCR denitration catalyst screen 10 purifies the flue gas that flows in and contains the denitration absorbent for the nitre content of the flue gas that flows out the SCR denitration catalyst screen 10 reaches standard. The flue gas with the sulfur content and the nitrate content reaching the standards flows into the second ion waterfall dust remover group 12 to carry out the third dust removal. Through the dust removal of the two ion waterfall dust remover groups, the dust in the flue gas basically reaches the emission standard, and may be slightly higher than the emission standard, and the dust is further removed by the subsequent carbon dioxide washing tower 15 and the mist eliminator 16. The flue gas flowing out of the second ion cascade dust collector group 12 flows to the air preheater 13.
In the embodiment of the present invention, the first ion waterfall dust remover group 8 includes: a plurality of ion waterfall dust collectors and a first ash collecting hopper 23, wherein all the ion waterfall dust collectors are positioned above the first ash collecting hopper 23; the second ion cascade dust collector group 12 includes: a plurality of ion waterfall dust collectors and a second ash collecting hopper, wherein the second ion waterfall dust collectors are positioned above the air preheater 13; the air preheater 13 is positioned above the second ash collecting hopper 24; each ion cascade dust collector in the first ion cascade dust collector group 8 is provided with a shielding hood (not shown in fig. 2 for simplicity of illustration), which is opened towards one surface of the first dust collecting hopper 23. This is so arranged because: in the embodiment of the invention, all the ion waterfall dust collectors adopt rapping for dust removal, if no isolation cover is arranged, the dust rapped in the rapping process is uncertain in dispersion and can pollute smoke again, and the isolation cover enables the dust rapped to fall down to the first dust collecting hopper 23 (depending on the action of gravity). And because only one ion waterfall dust collector is rapped each time during rapping, even if a small amount of dust rapped by the ion waterfall dust collector is brought into the first ion waterfall dust collector group 8 by flue gas in the process of falling downwards, the dust in the flue gas can still be removed by other working ion waterfall dust collectors. The dust knocked out in the first ion waterfall dust collector group 8 is desulfurized dust, for example: the gypsum and the like can be used for building materials and the like, achieve the aim of comprehensive utilization, and indirectly increase the benefit of the thermal power plant.
For the same reason, each ion waterfall dust collector in the second ion waterfall dust collector group 12 is also provided with a shielding cover which is open to one face of the air preheater 13. Since the first ion waterfall dust collector group 8 has removed a large amount of dust, the ion waterfall dust collector in the second ion waterfall dust collector group 12 can remove a small amount of dust, and the flue gas flows in the direction of the second dust collecting hopper 24, and further drives the rapped dust to fall into the second dust collecting hopper 24, and hardly adheres to the air preheater 13. As mentioned above, the first ion waterfall dust-removing group 8 and the second ion waterfall dust-removing group 12 each need to have a power supply device and a rapping device, and the power supply device and the rapping device are arranged on the top of the Chinese character 'ji'.
One reason for arranging the first ion waterfall dust removal group 8, the second ion waterfall dust removal group 12 and the SCR denitration catalyst screen 10 in a zigzag shape is to ensure that dust and ash shaken out of each of the first ion waterfall dust removal group 8 and the second ion waterfall dust removal group 12 can fall into the corresponding dust collecting hopper according to the action of gravity. Another reason is to ensure the operation performance of the SCR denitration catalyst panel 10. SCR denitration catalyst screen 10 arranges along how font top direction is perpendicular, and the SCR denitration catalyst screen 10 of suspension type like this, compare with horizontal arrangement, easily from boiler top hoist and mount maintenance and change the catalyst easily, moreover, the material in the flue gas is difficult to deposit the surface of catalyst in SCR denitration catalyst screen 10 under the action of gravity, in order to avoid influencing the efficiency of catalyst, the material in the flue gas is rushed to hit and can be changed the direction on SCR denitration catalyst screen 10 on the contrary, thereby inertia separation has been realized.
In the embodiment of the present invention, the SCR denitration catalyst screen 10 includes: a plurality of SCR catalyst screens; each SCR catalyst screen of the plurality of SCR catalyst screens includes: the device comprises rectangular boxes consisting of a stainless steel screen, a connecting rod and a fastener, wherein each rectangular box is filled with a honeycomb SCR catalyst. The flue gas that has guaranteed to flow into in SCR denitration catalyst screen 10 can be abundant by the purification, reaches the standard of denitration.
The flue gas flowing into the air preheater 13 can preheat the outside air, which is equivalent to preheating the outside air by using the waste heat of the flue gas, and the preheated air can be provided to the circulating fluidized bed boiler for combustion of the circulating fluidized bed boiler. Meanwhile, because the previous process finishes desulfurization, the problem of dew point corrosion of the air preheater 13 does not need to be worried about, so the temperature of the smoke at the outlet of the boiler can be designed to be lower, such as: 50-60 ℃, thereby reducing the smoke discharge loss of the boiler and improving the combustion efficiency of the boiler. In fig. 2, all the flue gas is in the flue, except that the air preheater 13 has an inlet and an outlet connected to the outside air, and all the flue gas is not labeled in fig. 2 for simplicity of illustration.
The induced draft fan 14 is located between the air preheater 13 and the carbon dioxide washing absorption tower 15, so that the induced draft fan 14 can introduce the cooled flue gas into the carbon dioxide washing absorption tower 15. The carbon dioxide washing and absorbing tower 15 is respectively connected with a carbon dioxide absorbent circulating box 21 and a new carbon dioxide absorbent box 22, the new carbon dioxide absorbent box 22 provides a new carbon dioxide absorbent, and the carbon dioxide absorbent circulating box 21 is used for recycling the carbon dioxide absorbent; the carbon dioxide scrubbing and absorbing tower 15 captures carbon from the cooled flue gas based on the circulation of a new carbon dioxide absorbent and a carbon dioxide absorbent, thereby capturing carbon dioxide. So that the carbon dioxide of the flue gas reaches the emission standard.
The flue gas after carbon capture flows to a demister 16, an ion waterfall demister 17 and a water spray capture ammonia escape device 18; the demister 16 is positioned above the carbon dioxide washing and absorbing tower 15; the ion waterfall demister 17 is positioned above the demister 16; the water spray catching ammonia escaper 18 is positioned above the ion waterfall demister 17; the demister collects fine particles of the flue gas after carbon capture, and since the first ion waterfall dust collector group 8 and the second ion waterfall dust collector group 12 remove dust from the flue gas, but a very small amount of fine particle dust may not be removed, the carbon dioxide washing and absorbing tower 15 and the demister 16 can remove the dust. The flue gas after the fine particles are collected flows to the ion waterfall demister 17; the working principle of the ion waterfall demister 17 is the same as that of the ion waterfall deduster, except that the ion waterfall demister 17 removes aerosol, not dust, from the flue gas after collecting fine particles. The flue gas from which the aerosol is removed flows to a water spray catching ammonia escaper 18; since the flue gas from which the aerosol is removed may contain aerosol and other mist substances and needs to be removed, the water spray ammonia trapping escaper 18 also needs to trap ammonia escaping from the flue gas from which the aerosol is removed, and the flue gas from which the ammonia escapes flows to the chimney 20.
The carbon dioxide and ammonia gas detection device 19 is positioned between the flue and the chimney 20; the carbon dioxide and ammonia gas detecting device 19 can detect the carbon dioxide content and the ammonia gas content in the flue gas after removing the aerosol and capturing the ammonia escape. And detecting whether the emission of the flue gas reaches the standard, and if not, giving an alarm and controlling to increase the flow of a pump of the carbon dioxide washing absorption tower 15. The flue gas after the removal of the aerosol and the escape of the captured ammonia is finally discharged through a stack 20.
In summary, the boiler system provided by the invention couples the functions of dust removal, desulfurization and denitration, and the ion waterfall dust removal means is creatively applied to flue gas dust removal, before denitration, the flue gas is subjected to dust removal by using the preposed dust removal collection unit and the first ion waterfall dust removal unit, and desulfurization and initial denitration are performed based on the desulfurization unit, so that the denitration SCR catalyst unit is not blocked, and efficient denitration is realized. And because the ion waterfall dust removal means is not influenced by the specific resistance of dust, the dust removal efficiency is high.
After SCR denitration, utilize second ion waterfall dust removal unit to remove dust the flue gas once more, because the desulfurization has been accomplished, so dew point corrosion can not appear in the air preheating unit, and the flue gas temperature of boiler outlet can set up lowly, has reduced the boiler and has discharged fume the loss, has improved boiler combustion efficiency. The carbon dioxide capturing unit and the demisting and ammonia capturing unit capture carbon dioxide, remove aerosol and capture ammonia escape, so that the flue gas finally reaches the emission standard. In addition, the boiler of the invention does not have dust removal and desulfurization facilities behind the conventional boiler in design, but utilizes an ion waterfall dust remover working at high temperature to realize the integrated design of flue gas purification and the boiler.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A circulating fluidized bed ion waterfall coupled boiler system, the boiler system comprising: circulating fluidized bed boiler and flue, be provided with in the flue: the device comprises a preposed dust removal and collection unit, a first ion waterfall dust removal unit, a second ion waterfall dust removal unit, a desulfurization unit, a denitration SCR catalyst unit, an air preheating unit, a carbon dioxide capturing unit and a demisting and ammonia capturing unit;
the pre-dedusting collection unit is arranged at the downstream of the economizer, the flue gas in the economizer flows into the pre-dedusting collection unit, the pre-dedusting collection unit performs primary dedusting on the flue gas, the flue gas after the primary dedusting flows to the first ion waterfall dedusting unit, and meanwhile, the pre-dedusting collection unit collects dust obtained by the primary dedusting;
a desulfurization absorbent nozzle is arranged in the desulfurization unit and positioned between the preposed dust removal and collection unit and the first ion waterfall dust removal unit, the desulfurization absorbent nozzle sprays desulfurization absorbent to desulfurize the flue gas subjected to the first dust removal, and the desulfurized flue gas flows into the first ion waterfall dust removal unit;
the first ion waterfall dust removal unit removes dust for the second time on the desulfurized flue gas, and the flue gas after dust removal for the second time flows to the denitration SCR catalyst unit;
A denitration absorbent nozzle is arranged at the downstream of the first ion waterfall dust removal unit, the denitration absorbent nozzle sprays denitration absorbent to the flue gas subjected to secondary dust removal, and the flue gas containing the denitration absorbent flows into the denitration SCR catalyst unit;
the denitration SCR catalyst unit purifies the flue gas containing the denitration absorbent, and the purified flue gas flows to the second ion waterfall dust removal unit;
the second ion waterfall dust removal unit removes dust for the third time on the purified flue gas, and the flue gas after the third dust removal flows to the air preheating unit;
the air preheating unit cools the flue gas subjected to the third dust removal, and the cooled flue gas flows to the carbon dioxide capturing unit;
the carbon dioxide capturing unit is used for capturing carbon of the cooled flue gas, and the flue gas subjected to carbon capture flows to the demisting and ammonia capturing unit;
the demisting and ammonia capturing unit is used for removing aerosol and capturing ammonia escape from the carbon-captured flue gas, and the flue gas after the aerosol removal and the ammonia escape is captured flows to a chimney of the boiler system;
the first ion waterfall dust removal unit, the denitration SCR catalyst unit, the second ion waterfall dust removal unit and the air preheating unit are distributed in a shape like a Chinese character ji, the denitration SCR catalyst unit is positioned at the top of the shape like the Chinese character ji and is vertically arranged along the horizontal direction, the first ion waterfall dust removal unit is positioned at one side of the shape like the Chinese character ji close to the circulating fluidized bed boiler, and the second ion waterfall dust removal unit and the air preheating unit are positioned at one side of the shape like the Chinese character ji close to the chimney.
2. The boiler system of claim 1, wherein the denox SCR catalyst unit comprises: a plurality of SCR catalyst screens;
each of the plurality of SCR catalyst screens includes: the device comprises a rectangular box body consisting of a stainless steel screen, a connecting rod and a fastener, wherein the rectangular box body is filled with a honeycomb SCR catalyst.
3. The boiler system according to claim 1, wherein the power supply device and the rapping device of each of the first ion waterfall dust removal unit and the second ion waterfall dust removal unit are disposed at the top of the zigzag.
4. The boiler system of claim 1, wherein the first ion waterfall dust removal unit comprises: the first ion waterfall dust remover group is positioned above the first dust collecting hopper;
the second ion waterfall dust removal unit comprises: the second ion waterfall dust remover group is positioned above the air preheating unit;
the air preheating unit is positioned above the second ash collecting hopper;
each ion waterfall dust remover in the first ion waterfall dust remover group is provided with an isolation cover, and one side of the isolation cover facing the first ash collecting hopper is provided with an opening;
And each ion waterfall dust remover in the second ion waterfall dust remover group is provided with a shielding cover, and the shielding cover faces to one side of the air preheating unit.
5. The boiler system according to claim 1, wherein the pre-dust removal collection unit includes: the device comprises an inertial dust collector, a third dust collecting hopper and a water seal scraper ash remover;
the inertial dust collector is positioned above the third dust collecting hopper, and is used for carrying out primary dust collection on the flue gas flowing into the preposed dust collection unit, and the collected dust falls into the first dust collecting hopper;
the third dust collecting hopper is positioned above the water seal scraper ash remover, and the water seal scraper ash remover removes dust falling into the third dust collecting hopper.
6. The boiler system of claim 1, wherein the carbon dioxide capture unit comprises: a carbon dioxide washing absorption tower, a carbon dioxide absorbent circulating box and a new carbon dioxide absorbent box;
the carbon dioxide washing and absorbing tower is respectively connected with the carbon dioxide absorbent circulating box and the fresh carbon dioxide absorbent box, the fresh carbon dioxide absorbent box provides a fresh carbon dioxide absorbent, and the carbon dioxide absorbent circulating box is used for recycling the carbon dioxide absorbent;
And the carbon dioxide washing absorption tower carries out carbon capture on the cooled flue gas based on the circulation of the new carbon dioxide absorbent and the carbon dioxide absorbent, and captures carbon dioxide.
7. The boiler system of claim 6, wherein the demisting and ammonia capture unit comprises: a demister, an ion waterfall demister and a water spray catching ammonia escaper;
the demister is positioned above the carbon dioxide washing and absorbing tower;
the ion waterfall demister is positioned above the demister;
the water spray catching ammonia escape device is positioned above the ion waterfall demister;
the demister is used for collecting fine particles of the flue gas after the carbon capture, and the flue gas after the fine particles are collected flows to the ion waterfall demister;
the ion waterfall demister removes aerosol from the flue gas after the fine particles are collected, and the flue gas after the aerosol is removed flows to the water spray catching ammonia escaper;
the water spray ammonia catching escaper catches ammonia escaping from the smoke after the aerosol is removed, and the smoke after the ammonia escaping is caught and flows to the chimney.
8. The boiler system according to claim 1, wherein the flue further has disposed therein: an induced draft fan;
The draught fan is located the air preheating unit with between the carbon dioxide capture unit, the draught fan will flue gas after the cooling is introduced the carbon dioxide capture unit.
9. The boiler system according to claim 1, wherein the flue further has disposed therein: a carbon dioxide and ammonia gas detection device;
the carbon dioxide and ammonia gas detection device is positioned between the flue and the chimney;
and the carbon dioxide and ammonia gas detection device detects the content of carbon dioxide and the content of ammonia gas in the flue gas after the aerosol removal and the ammonia capture escape.
10. The boiler system according to claim 1, wherein the circulating fluidized bed boiler is internally subjected to preliminary desulfurization based on limestone;
and carrying out primary denitration in the circulating fluidized bed boiler based on SNCR.
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