CN108607361B - Integrated injection system - Google Patents
Integrated injection system Download PDFInfo
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- CN108607361B CN108607361B CN201810727945.1A CN201810727945A CN108607361B CN 108607361 B CN108607361 B CN 108607361B CN 201810727945 A CN201810727945 A CN 201810727945A CN 108607361 B CN108607361 B CN 108607361B
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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
- B01D53/34—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
- B01D53/90—Injecting reactants
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
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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
- B01D53/34—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
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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
- B01D53/34—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
- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
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- 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
Abstract
The invention relates to an integrated injection system which comprises an air inlet component for providing a gas medium, a first feeding component for adding a gas reducing agent into the air inlet component, a second feeding component for adding an alkaline powder absorbent into the air inlet component, a fluidized bed type distribution component communicated with the air inlet component and used for fluidizing the alkaline powder absorbent, and an integrated injection component with one end communicated with the fluidized bed type distribution component and used for injecting the mixed fluidized alkaline powder absorbent and the gas reducing agent. According to the invention, the alkaline powder absorbent is fluidized and mixed with the gas reducing agent to form a fluidized two-phase mixed state, and the fluidized alkaline powder absorbent and the gas reducing agent are uniformly sprayed out through the integrated spraying assembly, SO that the fluidized alkaline powder absorbent and the gas reducing agent can fully react with the flue gas, and SO in the flue gas can be deeply removed 3 And the catalyst has applicability to the boiler, and has good environmental protection, economic benefit and wide application prospect.
Description
Technical Field
The present invention relates to an integrated injection system.
Background
SCR: selective Catalytic Reduction, SCR for short. SCR denitration technology refers to the process that a reducing agent (such as NH) is used at the temperature of 280-420 DEG C 3 Urea, ammonia, etc.) under the action of a catalyst, to react with NOx in the flue gas "selectively" to form pollution-free N 2 And H 2 NOx emission reduction technology of O.
The coal-fired boiler adopts fine alkali powder particles to remove SO in flue gas 3 Or when the activated carbon particles are adopted to remove mercury pollutants in the flue gas, a cylindrical pipeline which is horizontally arranged is generally arranged as a main pipe, a plurality of branch pipes connected with the main pipe extend into the flue, and gas carries solid particles to be sprayed into the flue through the branch pipes. The main pipe and the branch pipe structure can lead the gas flow between the branch pipes to be uniform, but can not realize the uniform flow of solid particles between the branch pipes, and is easy to cause smokeUneven chemical equivalent ratio of the absorbent to the pollutant on the cross section of the flue, too much local absorbent and too little local absorbent, uneven reaction in the flue can reduce the removal efficiency and increase the consumption of the absorbent.
In the prior art, a device for removing sulfur trioxide in flue gas by alkali liquor spray atomization (application number: 201610384872.1) combines a double-fluid atomization spray gun with a spoiler, a plurality of spray guns are arranged on the section of a flue, alkali liquor is sprayed into the flue gas by atomization, and the spraying device has low adaptability to a unit with large change of flue gas flow field distribution and law along with load; in the prior art, a boiler flue gas sulfur trioxide removal device (application number: 201710099614.3) is connected with a plurality of branch pipes through an injection main pipe, each branch pipe is provided with a plurality of flow equalizing nozzles, alkali powder is injected into flue gas in a pneumatic conveying mode, but uniformity of injection quantity of a base absorbent between the branch pipes and between the nozzles on the branch pipes cannot be realized.
For the process gas carrying solid particles and NH 3 The invention provides a device capable of realizing uniform distribution of gas-solid multiphase flow by taking the liquid characteristic (figure 1) presented by fluidized gas-solid multiphase flow into consideration.
Disclosure of Invention
The invention aims to solve the technical problem of providing an injection system for removing NOx from a reducing agent and an alkaline powder absorbent for removing SO 3 An integrated injection system incorporating both injection systems.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an integrated injection system comprises an air inlet component for providing a gas medium, a first feeding component communicated with the air inlet component and used for adding a gas reducing agent into the air inlet component, a second feeding component communicated with the air inlet component and used for adding an alkaline powder absorbent into the air inlet component, a fluidized bed type distribution component communicated with the air inlet component and used for fluidizing the alkaline powder absorbent, and an integrated injection component with one end communicated with the fluidized bed type distribution component and used for spraying the mixed fluidized alkaline powder absorbent and the gas reducing agent.
Specifically, the fluidized bed type distribution assembly comprises an air distribution plate with a first through hole, a metal ball layer, a first rectifying grid and a fluidized bed body, wherein the air distribution plate is communicated with the air inlet assembly, the metal ball layer is arranged on the air distribution plate, the first rectifying grid is arranged above the metal ball layer, the fluidized bed body is arranged above the first rectifying grid, and the integrated injection assembly is communicated with the fluidized bed body.
More specifically, the fluidized bed type distribution assembly further comprises a shell and a top cover which is arranged at the top of the shell and provided with a second through hole, and the air distribution plate, the metal ball layer, the first rectifying grid and the fluidized bed body are arranged in the shell.
Preferably, the diameter of the metal ball layer is larger than the diameter of the first through hole.
Further preferably, the diameter of the metal ball is 9-11mm, and the diameter of the first through hole is 4-6mm.
Preferably, the metal ball layer has a plurality of layers, and the first through holes have a plurality of layers.
Further preferably, the metal ball layer has two layers.
Preferably, the diameter of the second through hole is 28-32mm.
Preferably, the number of the second through holes is 20-50.
Preferably, the inner diameter of the fluidized bed type distribution assembly is 800-1500mm and the height is 200-500mm.
Preferably, the first rectifying grille is a fine grid-shaped rectifying grille.
Further preferably, the height of the first rectifying grille is 13-17mm, and the aperture is 8-12mm.
Specifically, the air inlet assembly comprises a divergent section with the upper end part communicated with the fluidized bed type distribution assembly and the upper part wide and the lower part narrow, and a conveying pipeline communicated with the lower end part of the divergent section, wherein the first feeding assembly and the second feeding assembly are respectively communicated with the conveying pipeline.
Preferably, the conveying pipeline comprises a first pipeline, a venturi tube, a second pipeline and a mixer, wherein one end part of the first pipeline is communicated with the lower end part of the diverging section, one end part of the venturi tube is communicated with the other end part of the first pipeline and is communicated with the second feeding assembly, one end part of the second pipeline is communicated with the venturi tube and is communicated with the first feeding assembly, and the mixer is arranged in the first pipeline.
Further preferably, the material of the conveying pipeline is stainless steel.
Further preferably, the diameter of the first pipe is 0.15-0.25m.
Further preferably, the diameter of the second pipe is 0.15-0.25m.
Further preferably, the mixer is a vortex mixer, and the vortex mixer can uniformly mix the alkaline powder absorbent, the gas reducing agent and the cold air.
Preferably, the air inlet assembly further comprises a flow equalizing grid and a second flow equalizing grid arranged in the diverging section.
In the invention, the flow equalizing grating and the second flow equalizing grating are arranged, so that the mixture of the gas medium, the gas reducing agent and the alkaline powder absorbent at the outlet of the diverging section is uniformly distributed, and the air flow vertically flows upwards.
Specifically, the integrated spraying assembly comprises a spraying pipe with one end communicated with the fluidized bed type distribution assembly and a nozzle arranged at the other end of the spraying pipe.
Preferably, the plurality of the spray pipes are arranged, one end of each spray pipe is provided with one spray nozzle, and the plurality of spray nozzles are uniformly distributed in a grid mode on the vertical section of the spray pipe.
Further preferably, a plurality of said mouthpieces are not in a single horizontal plane.
Preferably, the injection pipe is further provided with a third valve.
Further preferably, the third valve is a butterfly valve.
Preferably, the integrated spray assembly further comprises a cyclone arranged on the nozzle.
Preferably, the nozzle is a spiral nozzle.
Specifically, the system also comprises a first valve arranged on the first feeding component and used for controlling the flow rate of the gas reducing agent, and a second valve arranged on the second feeding component and used for controlling the adding content of the alkaline powder absorbent.
Preferably, the first feeding component is a gas injector.
Preferably, the second feeding assembly is a screw feeder.
Specifically, the system also comprises a powder storage bin arranged above the second feeding component.
Preferably, the gaseous reducing agent is ammonia.
Preferably, the alkaline powder absorbent is Ca (OH) 2 And (3) powder.
Further preferably, the particle size of the alkaline powder absorbent is 80-100 mesh.
Further preferably, the particle size of the alkaline powder absorber is 15-178 μm.
Preferably, the alkaline powder absorbent is mixed with SO 3 The molar ratio of (2) is 1.4-1.6:1; further preferably, the alkaline powder absorbent is mixed with SO 3 The molar ratio of (2) was 1.5:1.
Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the invention, the alkaline powder absorbent is fluidized and mixed with the gas reducing agent to form a fluidized two-phase mixed state, and the fluidized alkaline powder absorbent and the gas reducing agent are uniformly sprayed out through the integrated spraying assembly, SO that the fluidized alkaline powder absorbent and the gas reducing agent can be fully mixed and uniformly distributed, and can fully react with flue gas, and SO in the flue gas can be deeply removed 3 Has applicability to boilers with NOx, good environmental protection, economic benefit and wide applicationThe application prospect is good.
Drawings
FIG. 1 is a schematic illustration of liquid properties exhibited by a fluidized gas-solid multiphase flow;
FIG. 2 is a schematic view of the apparatus of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2;
wherein: 11. a boiler; 12. a boiler economizer; 13. a flue; 14. a second feed assembly; 15. a powder storage bin; 16. a first feed assembly; 2. a wide flue type flue gas mixer; 3. an air preheater; 4. an SCR reactor; 51. a primary cooling air duct; 61. a second pipe; 611. a divergent section; 612. a first pipe; 62. a venturi tube; 63. a mixer; 64. a flow equalizing grid; 65. a second rectification grille; 71. a wind distribution plate; 72. a metal ball layer; 73. a first rectifying grille; 74. a fluidized bed body; 75. a top cover; 76. a housing; 81. a jet pipe; 82. and (3) a nozzle.
Detailed Description
The invention will be further illustrated by the following specific examples, which are not intended to limit the scope of the invention. Modifications of the preparation method and the apparatus used may be made by those skilled in the art within the scope of the claims, and such modifications should also be considered as the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Device and method for controlling the same
As shown in figure 2, the system for removing SO in flue gas with integrated injection system 3 The device for NOx comprises a boiler 11, a boiler economizer 12, a flue 13, an SCR reactor 4, an air preheater 3, an integrated injection system and a wide flue type flue gas mixer 2, wherein one end of the boiler economizer 12 is communicated with the boiler 11, the flue 13 is communicated with the other end of the boiler economizer 12, the SCR reactor 4 is communicated with the boiler economizer 12 through the flue 13, the air preheater 3 is communicated with an outlet of the SCR reactor 4, the integrated injection system is used for fluidizing an alkaline powder absorbent and injecting the fluidized alkaline powder absorbent and a gas reducing agent into the flue 13 after mixing.
The integrated injection system comprises an air inlet assembly for providing a gaseous medium, a first feeding assembly 16 communicated with the air inlet assembly for adding a gaseous reducing agent into the air inlet assembly, a second feeding assembly 14 communicated with the air inlet assembly for adding an alkaline powder absorbent into the air inlet assembly, a fluidized bed type distribution assembly communicated with the air inlet assembly for fluidizing the alkaline powder absorbent, an integrated injection assembly respectively communicated with the fluidized bed type distribution assembly and the flue 13 for injecting the mixed fluidized alkaline powder absorbent and the gaseous reducing agent into the flue 13, and a powder storage bin 15 arranged above the second feeding assembly 14.
As shown in fig. 3, the air inlet assembly comprises a divergent section 611 with an upper end communicating with the fluidized bed type distribution assembly and a wide upper and a narrow lower, and a conveying pipe communicating with a lower end of the divergent section 611, and the first and second feeding assemblies 16 and 14 are respectively communicated with the conveying pipe. In the invention, the conveying pipeline is made of stainless steel.
The transfer duct includes a first duct 612 having an end in communication with the lower end of the diverging section 611, a venturi 62 having an end in communication with the other end of the first duct 612 and in communication with the second feed assembly 14, a second duct 61 having an end in communication with the venturi 62 and in communication with the first feed assembly 16, and a mixer 63 disposed within the first duct 612. Preferably, the diameter of the first conduit 612 is 0.15-0.25m and the diameter of the second conduit 61 is 0.15-0.25m.
The mixer 63 is provided downstream of the venturi tube 62 so as to be able to mix the alkaline powder absorbent, the gas reducing agent and the gas medium so as to be more uniform. In the present invention, the mixer 63 is a vortex mixer.
In communication with the air intake assembly for providing gaseous medium may be an air pump, the primary cooling air duct 51 of the air preheater 3 or the dilution fan outlet of the air preheater 3. In the invention, one end of the second pipeline 61 is connected with the primary cold air duct 51 of the air preheater 3 and is used for providing a gas medium, so that the energy is saved and the emission is reduced.
In order to enable the mixture of cold air, gas reducing agent and alkaline powder absorbent at the outlet cross section of the diverging section 611 to be uniformly distributed and the gas flow to be vertically raised, the gas inlet assembly further comprises a flow equalizing grid 64 and a second flow equalizing grid 65 which are arranged in the diverging section 611.
In order to be able to better control the flow rate of the gaseous reducing agent, the integrated injection system further comprises a first valve arranged on the first feeding assembly 16, and in order to be able to control the addition content and the speed of the alkaline powder absorbent, the integrated injection system further comprises a second valve arranged on the second feeding assembly 14.
In the present invention, the first feed assembly 16 is a gas injector and the second feed assembly 14 is a screw feeder.
As shown in fig. 3, the fluidized bed type distribution assembly includes a wind distribution plate 71 having a first through hole communicated with an upper end portion of the diverging section 611, a metal ball layer 72 provided on the wind distribution plate 71, a first rectifying grid 73 provided above the metal ball layer 72, and a fluidized bed body 74 provided above the first rectifying grid 73, and the integrated spray assembly is communicated with the fluidized bed body 74.
The fluidized bed type dispensing assembly further includes a housing 76, a top cover 75 provided at the top of the housing 76 and having a second through hole. The air distribution plate 71, the metal ball layer 72, the first rectification grating 73, and the fluidized bed body 74 are all disposed in the housing.
The diameter of the metal balls of the metal ball layer 72 is larger than the diameter of the first through holes. The metal ball layer 72 has a plurality of layers, the first rectifying grille 73 is a fine grid-shaped rectifying grille, the first through holes are plural, and the second through holes are plural. The diameter of the metal balls is 9-11mm, the height of the first rectifying grating 73 is 13-17mm, the aperture is 8-12mm, the diameter of the first through hole is 4-6mm, the diameter of the second through hole is 28-32mm, the number of the second through holes is 20-50, the inner diameter of the fluidized bed type distribution assembly is 800-1500mm, and the height is 200-500mm.
In this example, the fluid bed distribution assembly has an inner diameter of 900mm and a height of 500mm. The metal ball layer 72 has two layers, the diameter of the metal ball is 10mm, the height of the first rectifying grille 73 is 15mm, the aperture is 10mm, the diameter of the first through hole is 5mm, the diameter of the second through hole is 30mm, and 24 second through holes are formed in the top cover 75.
As shown in fig. 2 and 3, the integrated injection assembly comprises an injection pipe 81 with one end communicated with the fluidized bed body 74 and the other end inserted in the flue 13, and a nozzle 82 arranged at one end of the injection pipe 81, wherein the nozzle 82 is positioned in the flue 13.
In order to enable the fluidized alkaline absorbent and the gas reducing agent to fully react with the flue gas, the moving direction of the mixed gas flow of the fluidized alkaline absorbent and the gas reducing agent at the outlet of the nozzle 82 is the same as the moving direction of the flue gas, a plurality of spray pipes 81 are arranged, one end part of each spray pipe 81 is provided with one nozzle 82, and the plurality of nozzles 82 are uniformly arranged in a grid shape on the section of the flue 13. Preferably, the integrated spray assembly further comprises a swirler disposed on the nozzle 82. In this embodiment, the nozzles are spiral nozzles, the number of the injection pipes 81 is 24, and the depth of the nozzles 82 on the 24 injection pipes 81 in the flue 13 is different. In order to be able to control the flow better, the injection pipe 81 is also provided with a third valve. In this embodiment, the third valve is a butterfly valve.
In this embodiment, the horizontal flue 13 between the boiler economizer 12 and the SCR reactor 4 has a cross section of 3 mx 8m. To enhance the flue gas, NOx, SO in the wide flue 13 range 3 The fluidized alkaline powder absorbent and the gas reducing agent are mixed, the device also comprises a wide flue type flue gas mixer 2 (CN 206587601U) arranged in the horizontal section flue 13, and the wide flue type flue gas mixer 2 is positioned between the nozzle 82 and the SCR reactor 4 and downstream of one end of the injection pipe 81, so that multiphase chemical reaction with uniform distribution of chemical equivalent ratio can be realized on the section of the flue 13.
Treating SO in flue gas by adopting the device 3 The method for NOx is as follows:
in this embodiment, the gaseous reducing agent is ammonia. The alkaline powder absorbent is Ca (OH) 2 The granularity of the powder is 80-100 meshes, and the granularity is 15-178 mu m. Ca (OH) 2 Powder and SO 3 The molar ratio of (2) was 1.5:1.
Ca(OH) 2 The powder and the ammonia gas are conveyed to a fluidized bed type distribution assembly through an air inlet assembly and become fluidized Ca (OH) 2 The mixture of powder and ammonia gas is sprayed into the flue 13 by the integrated spraying component to combine with the flue gas in the flue 13, and the flue gas, NOx and SO are mixed by the wide flue type flue gas mixer 2 3 Fluidized Ca (OH) 2 Powder body,The ammonia gas is further mixed to further promote the reaction, and then passes through the SCR reactor 4 to finally deeply remove SO 3 And NOx.
Examples
2 SCR reactors 4 are arranged in a certain 300MW coal-fired unit, and the flue gas amount at the outlet of the boiler 11 is 1000000m under the rated load and 6% oxygen 3 Per h, temperature 350℃and NOx concentration 400mg/m 3 ，SO 2 The concentration is 3000mg/m 3 SO in flue gas inside boiler 11 and in SCR reactor 4 2 /SO 3 The conversion was 0.8% and 1.0%, respectively. To control NOx emission concentration less than 40mg/m 3 And air preheater 3 outlet SO 3 The concentration is less than 10mg/m 3 SO in desorption flue gas of design integration injection system 3 And NOx.
1. Material balance
According to the design boundary conditions and performance index requirements, the ammonia consumption is calculated to be 133kg/h, and the dilution air quantity of 5% volume concentration is calculated to be 3506m 3 And/h, the ammonia spraying dilution air quantity of the inlet of each SCR reactor 4 is 1753m 3 /h。
Consider SO inside the boiler 11 and inside the SCR reactor 4 2 /SO 3 Conversion and calculation to obtain SO at inlet of air preheater 3 3 The concentration is 67.5mg/m 3 。Ca(OH) 2 The powder injection amount was 101.8kg/h, and the injection amount at the inlet of each side of the SCR reactor 4 was 50.9kg/h.
2. Air inlet assembly
For example, cold air of 10kPa is drawn from the primary air duct 51 at the inlet of the air preheater 3, and the air flow rate in the transport duct is 15.7m/s in consideration of the temperature reference of 30 ℃.
3. First feed assembly 16, second feed assembly 14
Ammonia gas at a pressure of about 0.2MPa is injected into the second pipeline 61, and Ca (OH) in the powder storage bin 15 is injected into the second pipeline 2 Powder is injected into a venturi tube 62 of a conveying pipeline through a screw feeder, and a vortex mixer is arranged in a downstream tube of the venturi tube 62 to ensure Ca (OH) 2 The powder, ammonia and cold air are evenly mixed. Ammonia gas flow is controlled by a first valve, ca (OH) 2 The powder is controlled to flow through the rotating speed of the screw feeder and the second valve。
4. Fluidized bed type distribution assembly
Ca(OH) 2 The critical fluidization speed of the powder is 0.016-0.022m/s, and the sedimentation speed is 0.844-1.026m/s. The gas flow rate of the fluid bed distribution assembly was 0.78m/s.
5. Integrated spray assembly
The section of the horizontal flue 13 between the outlet of the boiler economizer 12 and the SCR reactor 4 is 3m×8m, 24 injection pipes 81 are uniformly arranged on the vertical section, and the mixed airflow speed of the outlet of the nozzle 82 is about 31m/s.
7. Wide flue type flue gas mixer 2
A wide flue type flue gas mixer 2 is arranged at the downstream of the nozzle 82 in the flue 13 to strengthen the mixing of the flue gas with a wide range in the flue 13 with the inlet width of 15-20m of the SCR reactor 4, and improve the flue gas, NOx and NH 3 、SO 3 、Ca(OH) 2 Is a uniform distribution of the particles.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (8)
1. An integrated spray system, characterized by: the device comprises a gas inlet assembly for providing a gas medium, a first feeding assembly (16) communicated with the gas inlet assembly and used for adding a gas reducing agent into the gas inlet assembly, a second feeding assembly (14) communicated with the gas inlet assembly and used for adding an alkaline powder absorbent into the gas inlet assembly, a fluidized bed type distribution assembly communicated with the gas inlet assembly and used for fluidizing the alkaline powder absorbent, and an integrated injection assembly with one end communicated with the fluidized bed type distribution assembly and used for injecting the fluidized alkaline powder absorbent and the gas reducing agent after mixing, wherein the gas inlet assembly comprises a divergent section (611) with the upper end communicated with the fluidized bed type distribution assembly and the upper end of the divergent section (611) and a conveying pipeline communicated with the lower end of the divergent section (611), and the first feeding assembly (16) and the second feeding assembly (14) are respectively communicated with the conveying pipeline; the fluidized bed distribution assembly comprises an air distribution plate (71) with a first through hole, a metal ball layer (72) arranged on the air distribution plate (71), a first rectifying grid (73) arranged above the metal ball layer (72) and a fluidized bed body (74) arranged above the first rectifying grid (73), wherein the air distribution plate is communicated with the air inlet assembly, and the integrated injection assembly is communicated with the fluidized bed body (74).
2. The system according to claim 1, wherein: the diameter of the metal balls of the metal ball layer (72) is larger than that of the first through holes.
3. The system according to claim 1, wherein: the metal ball layer (72) has a plurality of layers, and the first through holes have a plurality of layers.
4. The system according to claim 1, wherein: the conveying pipeline comprises a first pipeline (612) with one end communicated with the lower end part of the divergent section (611), a venturi tube (62) with one end communicated with the other end part of the first pipeline (612) and communicated with the second feeding component (14), a second pipeline (61) with one end communicated with the venturi tube (62) and communicated with the first feeding component (16), and a mixer (63) arranged in the first pipeline (612).
5. The system according to claim 1, wherein: the air inlet assembly further comprises a flow equalizing grid (64) and a second flow equalizing grid (65) which are arranged in the diverging section (611).
6. The system according to claim 1, wherein: the integrated spraying assembly comprises a spraying pipe (81) with one end communicated with the fluidized bed type distribution assembly and a nozzle (82) arranged at the other end of the spraying pipe (81).
7. The system according to claim 6, wherein: the spray pipes (81) are multiple, one end of each spray pipe (81) is provided with one spray nozzle (82), and the spray nozzles (82) are uniformly arranged in a grid mode on the vertical section of the spray pipe.
8. The system according to claim 6, wherein: the system also comprises a powder storage bin (15) arranged above the second feeding component (14).
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| CN201810727945.1A CN108607361B (en) | 2018-07-05 | 2018-07-05 | Integrated injection system |
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| CN108607361B true CN108607361B (en) | 2023-09-19 |
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