CN110141964B - Ammonia spraying system and ammonia spraying method for desulfurization and denitrification system - Google Patents
Ammonia spraying system and ammonia spraying method for desulfurization and denitrification system Download PDFInfo
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- CN110141964B CN110141964B CN201910528814.5A CN201910528814A CN110141964B CN 110141964 B CN110141964 B CN 110141964B CN 201910528814 A CN201910528814 A CN 201910528814A CN 110141964 B CN110141964 B CN 110141964B
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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
- B01D53/76—Gas phase processes, e.g. by using aerosols
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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
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention discloses an ammonia injection system and an ammonia injection method for a desulfurization and denitrification system, wherein an ammonia output device comprises a transfer chamber, an air supply pipe, an ammonia gas main outlet pipe, an ammonia gas generator and an air compressor, an output pipeline comprises a first main branch pipe and a second main branch pipe, the first main branch pipe is connected with a first branch pipe, a second branch pipe and a third branch pipe, the second main branch pipe is connected with a first branch pipe, a second branch pipe and a third branch pipe, a main control pneumatic on-off valve is installed on the ammonia gas main outlet pipe, a first flow regulating valve is installed on the first main branch pipe, a second flow regulating valve is installed on the second main branch pipe, a third flow regulating valve is installed on the first branch pipe, a fourth flow regulating valve is installed on the first branch pipe, a first three-way reversing valve is installed at the junction of the second branch pipe and the third branch pipe, and a second three-way reversing valve is installed at the junction of the second branch pipe and the third branch pipe. The ammonia gas with the corresponding amount can be introduced, and the waste of the ammonia gas is reduced.
Description
Technical Field
The invention relates to a flue gas treatment system, in particular to an ammonia injection system and an ammonia injection method for a desulfurization and denitrification system.
Background
The flue gas contains SO 2 And NO x And the method causes environmental pollution, so that desulfurization and denitrification treatment are required.
SO in flue gas 2 And O 2 And H 2 0 reacts to form H 2 SO 4 ，H 2 SO 4 Adsorbing on the surface of the carbon-based catalyst; simultaneously utilizes the catalytic performance of the carbon-based catalyst to remove NO in the flue gas x Carrying out catalytic reduction reaction with diluted ammonia gas to generate N 2 And regenerating the carbon-based catalyst subjected to the adsorption catalytic reaction for recycling.
But NO at different heights in the desulfurization and denitrification tower x The content is different, consequently need let in the ammonia of different volumes, satisfies the reduction reaction, and the mode that generally all adopts the mode of letting in excessive ammonia at present guarantees the abundant of reaction and goes on, causes the ammonia extravagant.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims at providing an ammonia injection system of a desulfurization and denitrification system aiming at NO in different areas x Different contents are introduced intoThe ammonia gas of the amount reduces the ammonia gas waste.
The technical purpose of the invention is realized by the following technical scheme: the utility model provides an ammonia injection system for SOx/NOx control system, includes ammonia conveyor, output line, ammonia output device include the transfer room, with transfer room access connection's air supply pipe, with transfer room exit linkage's ammonia total exit tube, with air supply union coupling's ammonia generator, install the air compressor on the air supply pipe, the relative air compressor's of gas outlet gas generator gas outlet is more close to the transfer room, output line includes first trunk branch pipe and the second trunk branch pipe that the input all is connected with the ammonia total exit tube, the output of first trunk branch pipe is connected with first branch pipe, second branch pipe and third branch pipe, the output of second trunk branch pipe is connected with branch pipe one, branch pipe two and branch pipe three, install the total accuse pneumatic on-off valve on the ammonia total exit tube, install first flow control valve on the first trunk branch pipe, install the second flow control valve on the second trunk branch pipe, install the third flow control valve on the first branch pipe, install fourth flow control valve on the branch pipe, branch pipe and the junction of third branch pipe set up the diversion branch pipe and the switching-over branch pipe junction.
When the denitration device is used, the first branch pipe, the second branch pipe and the branch pipe are used for being connected with the first denitration area, the first branch pipe, the second branch pipe and the third branch pipe are used for being connected with the second denitration area, and NO of the first denitration area and NO of the second denitration area x The contents are different; ammonia gas is discharged from an ammonia gas generator, the ammonia gas is sent into an air supply pipe through an air compressor, then the ammonia gas is divided into two paths, one path of the ammonia gas enters a first denitration area from a first main branch pipe through a first branch pipe and a second branch pipe, the other path of the ammonia gas enters a second denitration area from a second main branch pipe through a first branch pipe and a second branch pipe, the ammonia gas entering the first denitration area is mainly controlled by a first flow regulating valve, and the ammonia gas entering the second denitration area is mainly controlled by a second flow regulating valve; by controlling the third flowThe upper limit of the ammonia amount entering the denitration zone II can be improved by the amount regulating valve and the three-way reversing valve I, and the upper limit of the ammonia amount entering the denitration zone I can be provided by controlling the fourth flow regulating valve and the three-way reversing valve II, so that the denitration device is suitable for different working conditions.
Further, the axes of the air supply pipe and the ammonia gas main outlet pipe are positioned on the same straight line, the ammonia gas main outlet pipe is connected with a guide sleeve, the guide sleeve is positioned in the transfer chamber, the guide sleeve is in a hollow round table shape or a prismatic table shape and is communicated with the two ends in the axial direction, and the small end of the guide sleeve is communicated with the ammonia gas main outlet pipe.
The axes of the air supply pipe and the ammonia gas main outlet pipe are positioned on the same straight line and the guide sleeve is arranged, so that the ammonia gas can enter the ammonia gas main outlet pipe conveniently.
Furthermore, a water containing disc is installed in the transfer chamber, an ammonia gas inlet and outlet hole is formed in the middle of the water containing disc, and the water containing disc is located above the ammonia gas main outlet pipe.
And after the flue gas treatment is finished, the ammonia gas generator and the air compressor are closed, ammonia gas is generated in the period, and the ammonia gas enters the water tray through the ammonia gas inlet and outlet holes and is absorbed by water in the water tray because the density of the ammonia gas is lower than that of the air.
Furthermore, the water containing disc is provided with an electric heating ring along the circumferential direction, and the electric heating ring is sleeved on the outer wall of the water containing disc.
The water in the water tray is heated by electric heating, so that the ammonia gas comes out of the water and enters the ammonia gas main outlet pipe.
Furthermore, the guide pieces are installed above the ammonia gas inlet and outlet holes, the two guide pieces are symmetrically arranged and are in a V shape, the V-shaped tip portion faces back to the ammonia gas inlet and outlet hole, and the symmetry lines of the two guide pieces are parallel to or coincident with the axis of the ammonia gas inlet and outlet hole.
The guide piece is arranged to facilitate the ammonia gas to enter the water tray from the ammonia gas inlet and outlet.
Furthermore, a guide plate is arranged between the two guide pieces, the surface of the guide plate opposite to the ammonia gas inlet and outlet hole is a V-shaped surface, the tip of the V-shaped surface faces the ammonia gas inlet and outlet hole, and the horizontal line of the tip of the V-shaped surface is vertically intersected with the axis of the ammonia gas inlet and outlet hole.
The guide plate is arranged to facilitate the ammonia gas to enter the ammonia gas inlet and outlet after coming out of the water tray.
Furthermore, a main control pneumatic on-off valve is installed on the air supply pipe and is positioned between the air compressor and the outlet of the ammonia gas generator.
So that the outflow of ammonia gas from the air compressor can be avoided.
Furthermore, a flow-blocking cloth is installed at the small end of the guide sleeve, the upper end of the flow-blocking cloth is fixed with the upper end of the guide sleeve, and the size of the flow-blocking cloth is consistent with that of the small end of the guide sleeve.
Therefore, in the cloth flue gas treatment process, the flow-resistant cloth is made of cloth and is light, so that the flow-resistant cloth is blown open, and ammonia gas smoothly enters the ammonia gas main outlet pipe under the action of an air compressor; and the ammonia gas is arranged at the small end, and the ammonia gas can enter the guide sleeve under the action of the air compressor, so that the ammonia gas can not be dispersed due to the arrangement of the flow resistance cloth.
The second purpose of the invention is to provide an ammonia injection method, which adopts the ammonia injection system for the desulfurization and denitrification system.
In conclusion, the invention has the following beneficial effects: the present invention can be directed to different regions of NO x And when the contents are different, ammonia gas with corresponding quantity is introduced, so that the waste of ammonia gas is reduced.
Drawings
FIG. 1 is a schematic structural view of example 1;
FIG. 2 is a schematic structural view of an ammonia gas delivering device in embodiment 1.
Reference numerals: 0. an ammonia gas delivery device; 1. a transfer chamber; 11. an air supply pipe; 12. an ammonia gas total outlet pipe; 13. an ammonia gas generator; 14. an air compressor; 15. a master control pneumatic on-off valve; 2. a water containing tray; 21. ammonia gas inlet and outlet holes; 3. an electrical heating ring; 4. a guide piece; 5. a guide plate; 61. a guide sleeve; 62. flow resistance cloth; 71. a first trunk branch pipe; 72. a second trunk branch pipe; 731. a first branch pipe; 732. a second branch pipe; 733. a third branch pipe; 741. a branch pipe I; 742. a branch pipe II; 743. a branch pipe III; 75. a master control pneumatic on-off valve; 761. a first flow regulating valve; 762. a second flow regulating valve; 763. a third flow rate regulating valve; 764. a fourth flow regulating valve; 771. a first three-way reversing valve; 772. a three-way reversing valve II; 81. a first denitration area; 82. and a second denitration area.
Detailed Description
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications without inventive contribution to the present embodiment as required after reading the present specification, but all of them are protected by patent law within the scope of the present invention.
Example 1: an ammonia injection system for a desulfurization and denitrification system, as shown in figure 1, comprises an ammonia gas conveying device 0 and an output pipeline.
Referring to fig. 1, the ammonia gas output device 0 includes a relay chamber 1, an air supply pipe 11 connected to an inlet of the relay chamber 1, an ammonia gas outlet pipe 12 connected to an outlet of the relay chamber 1, an ammonia gas generator 13 (XRAQFC-20, new purification equipment, inc., su) connected to the air supply pipe 11, and an air compressor 14 installed on the air supply pipe 11, wherein an air outlet of the ammonia gas generator 13 is closer to the relay chamber 1 than an air outlet of the air compressor 14. The air supply pipe 11 is provided with a main control pneumatic on-off valve 15, and the main control pneumatic on-off valve 15 is positioned between the air compressor 14 and the outlet of the ammonia gas generator 13.
As shown in figure 2, a water containing disc 2 is arranged in the transfer chamber 1, an ammonia gas inlet and outlet hole 21 is formed in the middle of the water containing disc 2, and the water containing disc 2 is positioned above the ammonia gas main outlet pipe 12. The water containing disc 2 is provided with an electric heating ring 3 along the circumferential direction, and the electric heating ring 3 is sleeved on the outer wall of the water containing disc 2. The guide pieces 4 are arranged above the ammonia gas inlet and outlet hole 21, the two guide pieces 4 are symmetrically arranged and are V-shaped, the V-shaped tip part faces back to the ammonia gas inlet and outlet hole 21, and the symmetry lines of the two guide pieces 4 are parallel to or coincident with the axis of the ammonia gas inlet and outlet hole 21. A guide plate 5 is arranged between the two guide plates 4, the surface of the guide plate 5 opposite to the ammonia gas inlet and outlet hole 21 is a V-shaped surface, the tip of the V-shaped surface faces the ammonia gas inlet and outlet hole 21, and the horizontal line of the tip of the V-shaped surface is vertically intersected with the axis of the ammonia gas inlet and outlet hole 21.
As shown in fig. 2, the air supply pipe 11 and the ammonia gas main outlet 12 are both square pipes, the axes of the air supply pipe 11 and the ammonia gas main outlet 12 are on the same straight line, and the size of the cross section of the air supply pipe 11 is slightly larger than that of the ammonia gas main outlet 12. The ammonia gas main outlet pipe 12 is connected with a guide sleeve 61, the guide sleeve 61 is positioned in the transfer chamber 1, the guide sleeve 61 is in a hollow quadrangular frustum pyramid shape and is communicated with the two ends along the axial direction, and the small end of the guide sleeve 61 is communicated with the ammonia gas main outlet pipe 12. The cross-sectional size of the end face of the large end of the guide sleeve 61 is larger than the cross-sectional size of the air supply pipe 11. A choke cloth 62 is arranged at the small end of the guide sleeve 61, the upper end of the choke cloth 62 is fixed with the upper end of the guide sleeve 61, and the size of the choke cloth 62 is consistent with that of the small end of the guide sleeve 61.
As shown in fig. 1, the output pipeline includes a first trunk branch pipe 71 and a second trunk branch pipe 72, the input ends of which are connected to the ammonia gas main outlet pipe 12, the output end of the first trunk branch pipe 71 is connected to a first branch pipe 731, a second branch pipe 732 and a third branch pipe 733, the output end of the second trunk branch pipe 72 is connected to a first branch pipe 741, a second branch pipe 742 and a third branch pipe 743, the ammonia gas main outlet pipe 12 is provided with a main control pneumatic on-off valve 75, the first trunk branch pipe 71 is provided with a first flow regulating valve 761, the second trunk branch pipe 72 is provided with a second flow regulating valve 762, the first branch pipe 731 is provided with a third flow regulating valve 763, the first branch pipe 741 is provided with a fourth flow regulating valve 764, the junction of the second branch pipe 732 and the third branch pipe 733 is provided with a three-way reversing valve 771, the junction of the second branch pipe 742 and the third branch pipe 743 is provided with a three-way reversing valve 772, the first branch pipe 731, the third branch pipe 732, the third branch pipe 741 is used for connecting the first denitration branch pipe 81, the denitration branch pipe 82 and the second branch pipe 82.
When the denitration device is used, the first branch pipe 731, the second branch pipe 732 and the third branch pipe 743 are used for being connected with the first denitration area 81, the first branch pipe 741, the second branch pipe 742 and the third branch pipe 733 are used for being connected with the second denitration area 82, and NO of the first denitration area 81 and the second denitration area 82 x The contents are different; the ammonia gas comes out of the ammonia gas generator 13 and is compressed by an air compressor 14The ammonia gas is sent into the air supply pipe 11, then the ammonia gas is divided into two paths, one path of the ammonia gas enters a first denitration area 81 from a first main branch pipe 71 through a first branch pipe 731 and a second branch pipe 732, the other path of the ammonia gas enters a second denitration area 82 from a second main branch pipe 72 through a first branch pipe 741 and a second branch pipe 742, the ammonia gas entering the first denitration area 81 is mainly controlled by a first flow regulating valve 761, and the ammonia gas entering the second denitration area 82 is mainly controlled by a second flow regulating valve 762; the upper limit of the amount of ammonia gas entering the second denitration zone 82 can be improved by controlling the third flow regulating valve 763 and the first three-way reversing valve 771, and the upper limit of the amount of ammonia gas entering the first denitration zone 81 can be provided by controlling the fourth flow regulating valve 764 and the second three-way reversing valve 772, so that the denitration device can adapt to different working conditions more highly. When closed, the air compressor 14 and the main control pneumatic on-off valve 15 are closed first, and then the ammonia gas generator 13 is closed.
Example 2: an ammonia injection method, which adopts the ammonia injection system of the embodiment 1.
Claims (5)
1. The utility model provides an ammonia injection system for SOx/NOx control system, includes ammonia conveyor (0), output pipeline, its characterized in that: the ammonia gas output device (0) comprises a transfer chamber (1), an air supply pipe (11) connected with an inlet of the transfer chamber (1), an ammonia gas total outlet pipe (12) connected with an outlet of the transfer chamber (1), an ammonia gas generator (13) connected with the air supply pipe (11), and an air compressor (14) installed on the air supply pipe (11), wherein an air outlet of the ammonia gas generator (13) is closer to the transfer chamber (1) than an air outlet of the air compressor (14), the output pipeline comprises a first main branch pipe (71) and a second main branch pipe (72) of which input ends are connected with the ammonia gas total outlet pipe (12), an output end of the first main branch pipe (71) is connected with a first branch pipe (741), a second branch pipe (732) and a third branch pipe (733), an output end of the second main branch pipe (72) is connected with a first branch pipe (741), a second branch pipe (742) and a third branch pipe (743), the total control pneumatic on-off valve (75) is installed on the first branch pipe (71), a second branch pipe (731) is installed with a flow control valve (761) on the first branch pipe (731), and a fourth branch pipe (761) is installed on the first branch pipe (763), a three-way reversing valve I (771) is arranged at the junction of the second branch pipe (732) and the third branch pipe (733), and a three-way reversing valve II (772) is arranged at the junction of the second branch pipe II (742) and the third branch pipe III (743); the first branch pipe (731), the second branch pipe (732), the third branch pipe (743) are used for being connected with the first denitration area (81), and the first branch pipe (741), the second branch pipe (742) and the third branch pipe (733) are used for being connected with the second denitration area (82); a water containing disc (2) is arranged in the transfer chamber (1), an ammonia gas inlet and outlet hole (21) is formed in the middle of the water containing disc (2), and the water containing disc (2) is positioned above the ammonia gas main outlet pipe (12); the water containing disc (2) is provided with an electric heating ring (3) along the circumferential direction, and the electric heating ring (3) is sleeved on the outer wall of the water containing disc (2); guide pieces (4) are arranged above the ammonia gas inlet and outlet holes (21), two guide pieces (4) are symmetrically arranged and are V-shaped, the V-shaped tip part faces back to the ammonia gas inlet and outlet holes (21), and the symmetry lines of the two guide pieces (4) are parallel to or coincident with the axis of the ammonia gas inlet and outlet holes (21); the guide plate (5) is installed between the two guide pieces (4), the surface of the guide plate (5) opposite to the ammonia gas inlet and outlet hole (21) is a V-shaped surface, the tip of the V-shaped surface faces the ammonia gas inlet and outlet hole (21), and the horizontal line of the tip of the V-shaped surface is vertically intersected with the axis of the ammonia gas inlet and outlet hole (21).
2. The ammonia injection system for desulfurization and denitrification system according to claim 1, wherein: the air supply pipe (11) is on the same straight line with the axis of ammonia gas total exit tube (12), a uide bushing (61) is connected to ammonia gas total exit tube (12), uide bushing (61) are located transfer chamber (1), uide bushing (61) are hollow round platform form or prismoid form and link up along axial both ends, the tip and the ammonia gas total exit tube (12) intercommunication of uide bushing (61).
3. The ammonia injection system for desulfurization and denitrification system according to claim 1, wherein: the air supply pipe (11) is provided with a main control pneumatic on-off valve (15), and the main control pneumatic on-off valve (15) is positioned between the air compressor (14) and the outlet of the ammonia gas generator (13).
4. The ammonia injection system for desulfurization and denitrification system according to claim 2, wherein: the small end of the guide sleeve (61) is provided with a flow blocking cloth (62), the upper end of the flow blocking cloth (62) is fixed with the upper end of the guide sleeve (61), and the size of the flow blocking cloth (62) is consistent with that of the small end of the guide sleeve (61).
5. An ammonia injection method is characterized in that: the ammonia injection system for desulfurization and denitrification system as recited in any one of claims 1 to 4 is used.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910528814.5A CN110141964B (en) | 2019-06-18 | 2019-06-18 | Ammonia spraying system and ammonia spraying method for desulfurization and denitrification system |
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| CN201910528814.5A CN110141964B (en) | 2019-06-18 | 2019-06-18 | Ammonia spraying system and ammonia spraying method for desulfurization and denitrification system |
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| CN110141964B true CN110141964B (en) | 2022-10-04 |
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Citations (5)
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| CN201284239Y (en) * | 2008-11-02 | 2009-08-05 | 朱宗林 | Emptying apparatus of ammonia water tank |
| CN202366615U (en) * | 2011-12-21 | 2012-08-08 | 浙江蓝天求是环保集团有限公司 | System for performing denitration purification on flue gas by selective catalytic reduction (SCR) method |
| CN108380043A (en) * | 2018-02-12 | 2018-08-10 | 南京博沃科技发展有限公司 | A kind of SCR denitration device subregion spray ammonia adjustment control method |
| CN109126441A (en) * | 2018-08-08 | 2019-01-04 | 江苏吉能达环境能源科技有限公司 | A kind of intelligent flue gas denitration device |
| CN208553759U (en) * | 2018-07-27 | 2019-03-01 | 国家电投集团远达环保工程有限公司重庆科技分公司 | A kind of subregion precisely sprays ammonia smoke processing system |
-
2019
- 2019-06-18 CN CN201910528814.5A patent/CN110141964B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201284239Y (en) * | 2008-11-02 | 2009-08-05 | 朱宗林 | Emptying apparatus of ammonia water tank |
| CN202366615U (en) * | 2011-12-21 | 2012-08-08 | 浙江蓝天求是环保集团有限公司 | System for performing denitration purification on flue gas by selective catalytic reduction (SCR) method |
| CN108380043A (en) * | 2018-02-12 | 2018-08-10 | 南京博沃科技发展有限公司 | A kind of SCR denitration device subregion spray ammonia adjustment control method |
| CN208553759U (en) * | 2018-07-27 | 2019-03-01 | 国家电投集团远达环保工程有限公司重庆科技分公司 | A kind of subregion precisely sprays ammonia smoke processing system |
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