CN114471316A - Ammonia water vaporization mixing method and device for denitration - Google Patents
Ammonia water vaporization mixing method and device for denitration Download PDFInfo
- Publication number
- CN114471316A CN114471316A CN202210079556.9A CN202210079556A CN114471316A CN 114471316 A CN114471316 A CN 114471316A CN 202210079556 A CN202210079556 A CN 202210079556A CN 114471316 A CN114471316 A CN 114471316A
- Authority
- CN
- China
- Prior art keywords
- ammonia water
- cavity
- flue gas
- mixing
- temperature flue
- Prior art date
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- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 235000011114 ammonium hydroxide Nutrition 0.000 title claims abstract description 63
- 230000008016 vaporization Effects 0.000 title claims abstract description 53
- 238000009834 vaporization Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 8
- 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 25
- 239000007789 gas Substances 0.000 claims abstract description 18
- 230000001133 acceleration Effects 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims abstract description 10
- 230000002708 enhancing effect Effects 0.000 claims abstract description 3
- 238000009792 diffusion process Methods 0.000 claims description 22
- 238000005192 partition Methods 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 4
- 230000008602 contraction Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 229910021529 ammonia Inorganic materials 0.000 abstract description 5
- 239000006200 vaporizer Substances 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 3
- 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
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
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; the ammonia water is vaporized into ammonia gas by utilizing the heat of the high-temperature flue gas in the vaporization cavity; premixing high-temperature flue gas and ammonia gas in an accelerating cavity, inputting secondary high-temperature flue gas through a secondary high-temperature flue gas inlet, driving airflow by the secondary high-temperature flue gas, improving the airflow speed in the accelerating cavity by utilizing a Venturi effect, and enhancing turbulence among the airflow by a sealing plate; then the baffle plate in the mixing cavity is used for decelerating the accelerated mixed gas, so that the gas is uniformly mixed in the gas mixing channel. According to the invention, ammonia water vaporization, acceleration and mixing are all completed in the tower body, additional heating and acceleration equipment is not needed, the integrated arrangement of the equipment is realized, and the problems of large occupied space and high arrangement difficulty of the existing ammonia water vaporizer and the air-ammonia mixer are solved.
Description
Technical Field
The invention belongs to the technical field of ammonia water vaporization mixing, and relates to a method and a device for ammonia water vaporization mixing for denitration.
Background
In the field of flue gas denitration treatment, a reducing agent is needed to reduce 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 a 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 prior art is respectively provided with two sets of equipment, namely an ammonia water vaporizer and an ammonia/air mixer, and has the problems of large occupied area, difficult equipment arrangement and the like, and poor mixing effect.
Disclosure of Invention
In view of the above, the present invention aims to achieve sufficient vaporization and mixing of ammonia water, and provides a method and an apparatus for vaporization and mixing of ammonia water for denitration.
In order to achieve the purpose, the invention provides the following technical scheme:
an 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 formed in the inner sleeve; the high-temperature flue gas inlet and the ammonia water inlet are both communicated with the vaporization cavity;
a plurality of partition plates are arranged in the mixing cavity, the partition plates are arranged on the tower body at intervals and are arranged in a staggered and opposite mode, and gas mixing channels are formed among the partition plates; the ammonia water in the ammonia water inlet and the high-temperature flue gas entering from the high-temperature flue gas inlet are mixed in the vaporization cavity, the ammonia water is vaporized into ammonia gas, and the ammonia gas and the high-temperature flue gas are mixed in the gas mixing channel and then discharged from the flue gas outlet.
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 sectional area of the large end of the primary diffusion section is larger than that of the primary inlet section.
Further, the tower body structure also comprises an outer sleeve fixedly connected with the tower body; an acceleration 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 acceleration cavity; the vaporizing cavity and the mixing cavity are communicated with the accelerating cavity;
the inner sleeve is arranged in the acceleration 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.
Furthermore, 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.
Furthermore, 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.
An ammonia water vaporization mixing method for denitration adopts the ammonia water vaporization mixing integrated device for denitration, and ammonia water is vaporized into ammonia gas by utilizing the heat of high-temperature flue gas in a vaporization cavity; premixing high-temperature flue gas and ammonia gas in an accelerating cavity, inputting secondary high-temperature flue gas through a secondary high-temperature flue gas inlet, driving airflow by the secondary high-temperature flue gas, improving the airflow speed in the accelerating cavity by utilizing a Venturi effect, and enhancing turbulence among the airflow by a sealing plate; then the baffle plate in the mixing cavity is used for decelerating the accelerated mixed gas, so that the gas is uniformly mixed in the gas mixing channel.
The invention has the beneficial effects that:
1. according to the invention, the heat of high-temperature flue gas is utilized to vaporize ammonia water, the ammonia water is integrated in the tower body, the accelerating cavity is arranged, and the Venturi effect is utilized, namely when fluid flows through a pipeline with a reduced cross section, the flow speed of the cross section is increased according to Bernoulli's theorem, and a low-pressure area is generated near the fluid flowing at high speed, so that an adsorption effect is generated, the high-temperature flue gas and ammonia gas are accelerated, and turbulence is generated; and the air current slows down in the mixing chamber, makes the route of mixing channel lengthen through the baffle, has increased the mixing time of air current for the air current mixes more evenly.
2. The perforated sealing plate and the partition plate are arranged in the invention, so that the turbulence among air flows is enhanced, the heat transfer coefficient is improved, and the final mixing effect is improved.
3. According to the invention, ammonia water vaporization, acceleration and mixing are all completed in the tower body, additional heating and acceleration equipment is not needed, the integrated arrangement of the equipment is realized, and the problems of large occupied space and high arrangement difficulty of the existing ammonia water vaporizer and the air-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 objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of an integrated ammonia vaporizing and mixing device for denitration according to the present 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 taken along line B-B of FIG. 3;
FIG. 5 is a cross-sectional view taken at 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-closing the plate; 8-outer sealing plate; 9-secondary high-temperature flue gas inlet; 10-an outer sleeve; 11-opening a hole; 12-a secondary diffusion section; 13-a tower body; 14-square round section; 15-a separator.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood 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 numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 7, an ammonia water vaporization and mixing integrated device for denitration includes a tower body 13 having a flue gas outlet, the tower body 13 having a vaporization chamber 1 and a mixing chamber 3 communicated with each other; the vaporizing chamber 1 is arranged in an inner sleeve 6 fixedly connected with the tower body 13, the inner sleeve 6 is provided with a high-temperature flue gas inlet 4 and an ammonia water inlet 5, and spray guns for spraying ammonia water are arranged on 2 ammonia water inlets 5; the high-temperature flue gas inlet 4 and the ammonia water inlet 5 are both communicated with the vaporization chamber 1; the mixing cavity 3 is rectangular in cross section, a plurality of partition plates 15 are arranged in the mixing cavity 3, the partition plates 15 are arranged 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 joint 14; the ammonia water in the ammonia water inlet 5 is mixed with the high-temperature flue gas entering from the high-temperature flue gas inlet 4 in the vaporization cavity 1, the ammonia water is vaporized into ammonia gas, and the ammonia gas and the high-temperature flue gas are mixed in the gas mixing channel and then discharged from the flue gas outlet.
The vaporization chamber 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 the primary inlet section, and the 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 this embodiment, the tower body 13 is further fixedly provided with an outer sleeve 10; an acceleration 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 vaporizing chamber 1 and the mixing chamber 3 are both communicated with the accelerating chamber 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 is communicated with the mixing cavity 3.
Wherein, be provided with shrouding 7 on the throat, be provided with a plurality of trompil 11 on the shrouding 7, the major end fixed mounting of primary diffusion section 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.
A method for vaporizing and mixing ammonia water for denitration, which adopts the ammonia water vaporizing and mixing integrated device for denitration in the embodiment, and vaporizes the ammonia water into ammonia gas by using the heat of high-temperature flue gas in a vaporization chamber 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 and improves air flow speed in the accelerating cavity 2 by utilizing a Venturi effect, and turbulence among the air flow is enhanced through the sealing plate 7; the accelerated mixed gas is decelerated by the partition plate 15 in the mixing cavity 3, so that the gas is uniformly mixed in the gas mixing channel.
When the ammonia gasification furnace 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 into ammonia gas. Is sprayed into the accelerating cavity 2 through the air outlet hole on the inner sleeve 6, is mixed with the secondary high-temperature flue gas with the temperature of about 280 ℃ from the secondary high-temperature flue gas inlet 9, is accelerated in the accelerating cavity 2 by utilizing the Venturi effect, enters the mixing section, is guided by the partition plate 15 to be uniformly mixed and then is discharged from the flue gas outlet.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (7)
1. The utility model provides an aqueous ammonia vaporization mixes integrated device for denitration which characterized in that: the device 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 formed in the inner sleeve; the high-temperature flue gas inlet and the ammonia water inlet are both communicated with the vaporization cavity;
a plurality of partition plates are arranged in the mixing cavity, the partition plates are arranged on the tower body at intervals and are arranged in a staggered and opposite mode, and gas mixing channels are formed among the partition plates; the ammonia water in the ammonia water inlet and the high-temperature flue gas entering from the high-temperature flue gas inlet are mixed in the vaporization cavity, the ammonia water is vaporized into ammonia gas, and the ammonia gas and the high-temperature flue gas are mixed in the gas mixing channel and then discharged from the flue gas outlet.
2. The ammonia water vaporization and mixing integrated device for denitration of claim 1, characterized in that: 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 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.
3. The ammonia water vaporization and mixing integrated device for denitration of claim 2, characterized in that: the tower body is fixedly connected with the tower body; an acceleration 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 acceleration cavity; the vaporizing cavity and the mixing cavity are communicated with the accelerating cavity;
the inner sleeve is arranged in the acceleration 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.
4. The ammonia water vaporization and mixing integrated device for denitration of claim 3, characterized in that: the throat is provided with a sealing plate, the sealing plate is provided with a plurality of openings, and the large end of the primary diffusion section is fixedly connected with the sealing plate.
5. The ammonia water vaporization and mixing integrated device for denitration of claim 3, characterized in that: and 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.
6. The ammonia water vaporizing and mixing integrated device for denitration of claim 1, which is characterized in that: and a spray gun for spraying ammonia water is arranged on the ammonia water inlet.
7. An ammonia water vaporization mixing method for denitration is characterized in that: adopting the ammonia water vaporization and mixing integrated device for denitration according to any one of claims 1 to 6; the ammonia water is vaporized into ammonia gas by utilizing the heat of the high-temperature flue gas in the vaporization cavity; premixing high-temperature flue gas and ammonia gas in an accelerating cavity, inputting secondary high-temperature flue gas through a secondary high-temperature flue gas inlet, driving airflow by the secondary high-temperature flue gas, improving the airflow speed in the accelerating cavity by utilizing a Venturi effect, and enhancing turbulence among the airflow by a sealing plate; then the baffle plate in the mixing cavity is used for decelerating the accelerated mixed gas, so that the gas is uniformly mixed in the gas mixing channel.
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 |
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| 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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| CN114471316A true CN114471316A (en) | 2022-05-13 |
| CN114471316B CN114471316B (en) | 2024-04-09 |
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| Publication number | Publication date |
|---|---|
| CN114471316B (en) | 2024-04-09 |
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