CN114471316B - Ammonia water vaporization mixing method and device for denitration - Google Patents
Ammonia water vaporization mixing method and device for denitration Download PDFInfo
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- CN114471316B CN114471316B CN202210079556.9A CN202210079556A CN114471316B CN 114471316 B CN114471316 B CN 114471316B CN 202210079556 A CN202210079556 A CN 202210079556A CN 114471316 B CN114471316 B CN 114471316B
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- cavity
- flue gas
- temperature flue
- ammonia
- mixing
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- 230000008016 vaporization Effects 0.000 title claims abstract description 50
- 238000009834 vaporization Methods 0.000 title claims abstract description 48
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 235000011114 ammonium hydroxide Nutrition 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 63
- 239000003546 flue gas Substances 0.000 claims abstract description 63
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 54
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 20
- 230000001133 acceleration Effects 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 claims abstract description 9
- 238000009792 diffusion process Methods 0.000 claims description 21
- 238000005192 partition Methods 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 4
- 230000008602 contraction Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000006200 vaporizer Substances 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
-
- 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)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention belongs to the technical field of ammonia water vaporization mixing, and relates to an ammonia water vaporization mixing method and device for denitration, wherein an ammonia water vaporization mixing integrated device for denitration is adopted; vaporizing ammonia water into ammonia gas in the vaporization cavity by utilizing the heat of the high-temperature flue gas; the high-temperature flue gas and ammonia gas are premixed in the accelerating cavity, secondary high-temperature flue gas is input through a secondary high-temperature flue gas inlet, the secondary high-temperature flue gas drives air flow, the speed of the air flow is improved in the accelerating cavity by utilizing a Venturi effect, and turbulence among the air flows is enhanced through a sealing plate; and then the accelerated mixed gas is decelerated by using a baffle plate in the mixing cavity, so that the gas is uniformly mixed in the gas mixing channel. According to the invention, ammonia vaporization, acceleration and mixing are completed in the tower body, additional heating and acceleration equipment is not needed, the integrated arrangement of equipment is realized, and the problems of large occupied space and high arrangement difficulty of the existing ammonia vaporizer and ammonia mixer are solved.
Description
Technical Field
The invention belongs to the technical field of ammonia water vaporization mixing, and relates to an ammonia water vaporization mixing method and device for denitration.
Background
In the field of flue gas denitration treatment, a reducing agent is required to be used for reducing NOx into nitrogen and water in SCR denitration reaction, and the conventional reducing agent mainly comprises ammonia water and the like. Before ammonia water enters the denitration reaction flue, ammonia water needs to be atomized into ammonia gas and diluted to be below 5%, and the diluted ammonia gas is sprayed into the denitration inlet flue and mixed with flue gas to carry out SCR denitration reaction.
The existing technology is provided with two sets of equipment of an ammonia vaporizer and an ammonia/air mixer respectively, so that the problems of large occupied area, difficult equipment arrangement and the like exist, and the mixing effect is poor.
Disclosure of Invention
In view of the above, the present invention aims to provide an ammonia water vaporization mixing method and apparatus for denitration.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the ammonia water vaporization and mixing integrated device for denitration comprises a tower body provided with a flue gas outlet, wherein a vaporization cavity and a mixing cavity which are communicated with each other are arranged in the tower body; the vaporization cavity is arranged in an inner sleeve fixedly connected with the tower body, and a high-temperature flue gas inlet and an ammonia water inlet are arranged on the inner sleeve; the high-temperature flue gas inlet and the ammonia water inlet are communicated with the vaporization cavity;
the mixing cavity is internally provided with a plurality of partition boards which are arranged on the tower body at intervals and are arranged in a staggered and opposite way, and a gas mixing channel is formed between the partition boards; ammonia in the ammonia water inlet and high-temperature flue gas entering through the high-temperature flue gas inlet are mixed in the vaporization cavity, ammonia is vaporized into ammonia, and the ammonia and the high-temperature flue gas are discharged from the flue gas outlet after being mixed in the gas mixing channel.
Further, the vaporization cavity comprises a primary inlet section and a primary diffusion section which are connected in series; the high-temperature flue gas inlet and the ammonia water inlet are both arranged on the primary inlet section, and the primary diffusion section is arranged in the tower body; the primary diffusion section is conical, and the cross section area of the large end of the primary diffusion section is larger than that of the primary inlet section.
Further, the tower also comprises an outer sleeve fixedly connected with the tower body; an accelerating cavity is arranged in the outer sleeve; the outer sleeve is provided with a secondary high-temperature flue gas inlet which is communicated with the accelerating cavity; the vaporization cavity and the mixing cavity are communicated with the acceleration cavity;
the inner sleeve is arranged in the accelerating cavity; the accelerating cavity comprises a secondary inlet section, a contraction section, a throat and a secondary diffusion section which are connected in sequence; the secondary high-temperature flue gas inlet is arranged on the secondary inlet section; the secondary diffusion section is communicated with the mixing cavity.
Further, be equipped with the shrouding on the throat, be equipped with a plurality of trompil on the shrouding, the big end and the shrouding fixed connection of primary diffusion section.
Further, a plurality of air outlet holes are formed in the inner sleeve, one end of each air outlet hole is communicated with the vaporization cavity, and the other end of each air outlet hole is communicated with the acceleration cavity.
Further, a spray gun for spraying ammonia water is arranged on the ammonia water inlet.
The ammonia water vaporization mixing method for denitration adopts the ammonia water vaporization mixing integrated device for denitration, and the ammonia water is vaporized into ammonia gas by utilizing the heat of high-temperature flue gas in a vaporization cavity; the high-temperature flue gas and ammonia gas are premixed in the accelerating cavity, secondary high-temperature flue gas is input through a secondary high-temperature flue gas inlet, the secondary high-temperature flue gas drives air flow, the speed of the air flow is improved in the accelerating cavity by utilizing a Venturi effect, and turbulence among the air flows is enhanced through a sealing plate; and then the accelerated mixed gas is decelerated by using a baffle plate in the mixing cavity, so that the gas is uniformly mixed in the gas mixing channel.
The invention has the beneficial effects that:
1. according to the invention, ammonia water is vaporized by utilizing the heat of high-temperature flue gas, the ammonia water is integrated into a tower body, and an accelerating cavity is arranged at the same time, so that the flow speed at the section position is increased according to Bernoulli's theorem when fluid flows through a pipeline with a reduced section, and a low-pressure area is generated near the fluid flowing at a high speed, thereby generating an adsorption effect, accelerating the high-temperature flue gas and ammonia gas and generating turbulence; the air flow is decelerated in the mixing cavity, the path of the mixing channel is prolonged through the partition plate, the mixing time of the air flow is prolonged, and the air flow is more uniformly mixed.
2. The sealing plate with holes and the partition plate provided by the invention strengthen turbulence among air flows, improve heat transfer coefficient and finally improve the mixing effect.
3. According to the invention, ammonia vaporization, acceleration and mixing are completed in the tower body, additional heating and acceleration equipment is not needed, the integrated arrangement of equipment is realized, and the problems of large occupied space and high arrangement difficulty of the existing ammonia vaporizer and ammonia mixer are solved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of an overall ammonia vaporization mixing integrated device for denitration in the invention;
FIG. 2 is a schematic view of an inner sleeve;
FIG. 3 is a schematic view of an outer sleeve;
FIG. 4 is a cross-sectional view B-B of FIG. 3;
FIG. 5 is a cross-sectional view of C-C of FIG. 3;
FIG. 6 is a schematic view of a mixing chamber;
fig. 7 is a left side view of fig. 6.
Reference numerals: 1-a vaporization chamber; 2-an acceleration chamber; 3-a mixing chamber; 4-high-temperature flue gas inlet; 5-ammonia water inlet; 6-an inner sleeve; 7-sealing plates; 8-an outer sealing plate; 9-a secondary high-temperature flue gas inlet; 10-an outer sleeve; 11-opening holes; 12-a secondary diffusion section; 13-tower body; 14-square round section; 15-separator.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1 to 7, an ammonia vaporization and mixing integrated device for denitration comprises a tower body 13 provided with a flue gas outlet, wherein a vaporization cavity 1 and a mixing cavity 3 which are communicated with each other are arranged in the tower body 13; the vaporization cavity 1 is arranged in an inner sleeve 6 fixedly connected with a tower body 13, a high-temperature flue gas inlet 4 and an ammonia water inlet 5 are arranged on the inner sleeve 6, and spray guns for spraying ammonia water are arranged on the ammonia water inlets 5 and 2 ammonia water inlets 5; the high-temperature flue gas inlet 4 and the ammonia water inlet 5 are communicated with the vaporization cavity 1; the mixing cavity 3 is of a rectangular section, a plurality of partition plates 15 are arranged in the mixing cavity 3, the partition plates 15 are installed on the tower body 13 at intervals and are arranged in a staggered and opposite mode, a gas mixing channel is formed between the partition plates 15, and the mixing cavity 3 is communicated with a flue gas outlet through a square round section 14; ammonia in the ammonia water inlet 5 is mixed with high-temperature flue gas entering the high-temperature flue gas inlet 4 in the vaporization cavity 1, ammonia is vaporized into ammonia, and the ammonia and the high-temperature flue gas are discharged from a flue gas outlet after being mixed in a gas mixing channel.
The vaporization cavity 1 comprises a primary inlet section and a primary diffusion section which are connected in series; the high-temperature flue gas inlet 4 and the ammonia water inlet 5 are both arranged on a primary inlet section, and a primary diffusion section is arranged in the tower body 13; the primary diffusion section is conical, and the sectional area of the large end of the primary diffusion section is larger than that of the primary inlet section.
In the embodiment, an outer sleeve 10 is also fixedly arranged on the tower body 13; an accelerating cavity 2 is arranged in the outer sleeve 10; the outer sleeve 10 is also provided with 2 secondary high-temperature flue gas inlets 9, and the secondary high-temperature flue gas inlets 9 are communicated with the accelerating cavity 2; the vaporization cavity 1 and the mixing cavity 3 are communicated with the acceleration cavity 2; the inner sleeve 6 is arranged in the accelerating cavity 2 and is fixedly arranged on an outer sealing plate 8 at the bottom of the outer sleeve 10; the accelerating cavity 2 comprises a secondary inlet section, a contraction section, a throat and a secondary diffusion section 12 which are connected in sequence; the secondary high-temperature flue gas inlet 9 is arranged on the secondary inlet section; the secondary diffusion section 12 communicates with the mixing chamber 3.
Wherein, be provided with shrouding 7 on the throat, be provided with a plurality of trompil 11 on the shrouding 7, the large end fixed mounting of primary diffuser is on shrouding 7. The inner sleeve is provided with a plurality of air outlet holes, one end of each air outlet hole is communicated with the vaporization cavity 1, and the other end of each air outlet hole is communicated with the acceleration cavity 2.
An ammonia water vaporization mixing method for denitration adopts the ammonia water vaporization mixing integrated device for denitration in the embodiment, and the ammonia water is vaporized into ammonia gas by utilizing the heat of high-temperature flue gas in a vaporization cavity 1; the high-temperature flue gas and ammonia gas are premixed in the accelerating cavity 2, secondary high-temperature flue gas is input through a secondary high-temperature flue gas inlet 9, the secondary high-temperature flue gas drives air flow, the air flow speed is improved in the accelerating cavity 2 by utilizing the Venturi effect, and turbulence among the air flows is enhanced through the sealing plates 7; the accelerated mixed gas is decelerated by the partition plate 15 in the mixing chamber 3, so that the gas is uniformly mixed in the gas mixing channel.
When the device works, primary high-temperature flue gas at the temperature of about 280 ℃ enters the vaporization cavity 1 through the high-temperature flue gas inlet 4, and normal-temperature ammonia water from the spray gun is carried and heated, so that the ammonia water is fully vaporized to be ammonia gas. The gas is sprayed into the accelerating cavity 2 through the gas outlet hole on the inner sleeve 6, is mixed with the secondary high-temperature flue gas at the temperature of about 280 ℃ from the secondary high-temperature flue gas inlet 9, is accelerated in the accelerating cavity 2 by the Venturi effect, enters the mixing section, is uniformly mixed by the flow guide of the partition plate 15, and is discharged from the flue gas outlet.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (2)
1. The ammonia water vaporization mixing method for denitration is characterized by comprising the following steps of: adopting an ammonia water vaporization mixing integrated device for denitration; the ammonia water vaporization and mixing integrated device for denitration comprises a tower body provided with a flue gas outlet, wherein a vaporization cavity and a mixing cavity which are communicated with each other are arranged in the tower body; the vaporization cavity is arranged in an inner sleeve fixedly connected with the tower body, and a high-temperature flue gas inlet and an ammonia water inlet are arranged on the inner sleeve; the high-temperature flue gas inlet and the ammonia water inlet are communicated with the vaporization cavity;
the mixing cavity is internally provided with a plurality of partition boards which are arranged on the tower body at intervals and are arranged in a staggered and opposite way, and a gas mixing channel is formed between the partition boards; ammonia in the ammonia water inlet is mixed with high-temperature flue gas entering the high-temperature flue gas inlet in the vaporization cavity, ammonia is vaporized into ammonia gas, and the ammonia gas and the high-temperature flue gas are discharged from the flue gas outlet after being mixed in the gas mixing channel; the vaporization cavity comprises a primary inlet section and a primary diffusion section which are connected in series; the high-temperature flue gas inlet and the ammonia water inlet are both arranged on the primary inlet section, and the primary diffusion section is arranged in the tower body; the primary diffusion section is conical, and the sectional area of the large end of the primary diffusion section is larger than that of the primary inlet section;
the outer sleeve is fixedly connected with the tower body; an accelerating cavity is arranged in the outer sleeve; the outer sleeve is provided with a secondary high-temperature flue gas inlet which is communicated with the accelerating cavity; the vaporization cavity and the mixing cavity are communicated with the acceleration cavity; the inner sleeve is arranged in the accelerating cavity; the accelerating cavity comprises a secondary inlet section, a contraction section, a throat and a secondary diffusion section which are connected in sequence; the secondary high-temperature flue gas inlet is arranged on the secondary inlet section; the secondary diffusion section is communicated with the mixing cavity; a sealing plate is arranged on the throat, a plurality of openings are formed in the sealing plate, and the large end of the primary diffusion section is fixedly connected with the sealing plate; the inner sleeve is provided with a plurality of air outlet holes, one end of each air outlet hole is communicated with the vaporization cavity, and the other end of each air outlet hole is communicated with the acceleration cavity;
vaporizing ammonia water into ammonia gas in the vaporization cavity by utilizing the heat of the high-temperature flue gas; the high-temperature flue gas and ammonia gas are sprayed into an accelerating cavity through an air outlet hole on the inner sleeve and are mixed with secondary high-temperature flue gas from a secondary high-temperature flue gas inlet, the secondary high-temperature flue gas drives air flow, the air flow speed is improved in the accelerating cavity by utilizing a Venturi effect, and turbulence among the air flows is enhanced through a sealing plate; and then the accelerated mixed gas is decelerated by using a baffle plate in the mixing cavity, so that the gas is uniformly mixed in the gas mixing channel.
2. The ammonia water vaporization mixing method for denitration according to claim 1, characterized in that: the ammonia water inlet is provided with a spray gun for spraying ammonia water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210079556.9A CN114471316B (en) | 2022-01-24 | 2022-01-24 | Ammonia water vaporization mixing method and device for denitration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210079556.9A CN114471316B (en) | 2022-01-24 | 2022-01-24 | Ammonia water vaporization mixing method and device for denitration |
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| Publication Number | Publication Date |
|---|---|
| CN114471316A CN114471316A (en) | 2022-05-13 |
| CN114471316B true CN114471316B (en) | 2024-04-09 |
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| Publication number | Publication date |
|---|---|
| CN114471316A (en) | 2022-05-13 |
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