CN103506234A - SNCR flue gas denitration spray gun and double-cavity mixing double-layer injection technology thereof - Google Patents
SNCR flue gas denitration spray gun and double-cavity mixing double-layer injection technology thereof Download PDFInfo
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- CN103506234A CN103506234A CN201310446280.4A CN201310446280A CN103506234A CN 103506234 A CN103506234 A CN 103506234A CN 201310446280 A CN201310446280 A CN 201310446280A CN 103506234 A CN103506234 A CN 103506234A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
- B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
- B05B7/0491—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid the liquid and the gas being mixed at least twice along the flow path of the liquid
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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
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- 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
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
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- Environmental & Geological Engineering (AREA)
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- Biomedical Technology (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
Provided are an SNCR flue gas denitration spray gun and a double-cavity mixing double-layer injection technology thereof. The spray gun is composed of a central injection pipe, an outer-layer annular injection pipe, a central mixing cavity and an outer-layer mixing cavity. The spray gun is characterized in that the injection technology includes the steps that a reducing agent entering from a reducing agent conveying pipe section and compressed gas entering from a compressed gas conveying pipe section are mixed in a first mixing cavity, and most gas-liquid mixture enters the central injection pipe and is sprayed in flue gas to be treated through a central injection opening; a part of the gas-liquid mixture in the first mixing cavity enters a second mixing cavity through a one-way communicating pipe, a part of compressed air entering from the compressed air conveying pipe section does not pass through the first mixing cavity and enters the second mixing cavity directly through a communicating pipe, and a gas-liquid mixture in the second mixing cavity is sprayed in the flue gas to be treated through the outer-layer annular injection pipe. The SNCR flue gas denitration spray gun and the double-cavity mixing double-layer injection technology of the SNCR flue gas denitration spray gun have the advantages that two gas-liquid mixtures containing the reducing agent and the compressed air can be obtained by the adoption of double-cavity mixing so as to complete different spraying effects, and double layers of sleeves can prevent the two gas-liquid mixtures from influencing mutually.
Description
Technical field
The invention belongs to the method for purifying exhaust air, relate to SNCR denitration (SNCR) applied technical field, be specifically related to two-chamber hybrid double-layer spray technology for a kind of SNCR denitrating flue gas spray gun.
Background technology
At atmosphere pollution species, nitrogen oxide is to be subject to recently greatly a kind of pollutant of concern.For the nitrogen oxide of cement industry and recirculating fluidized bed discharge, feasible technology comprises the technology such as SNCR denitration SNCR, selective-catalytic-reduction denitrified SCR and low NO at present.Wherein, SNCR its higher denitration efficiency and invest low feature and become the most widely used technology.
Denitration efficiency for SNCR technique, its major influence factors comprises reaction time and the extent of reaction, and the core process that affects this factor is exactly the performance of spray gun, because spray gun is to belong to by limit wall to central-injection, therefore spray gun need to have enough penetrability, guarantee that reducing agent can arrive center, secondly the injection of spray gun need to have enough degrees of scatter, can mix fast with flue gas and can carry out large-area covering.Conventional lance is difficult to both meet enough penetration powers, has again good atomizing effect.As a kind of SNCR denitrating technique spray gun special (publication number: 103170231A), its inventive point is mainly being sought better atomizing effect, and required higher penetrability while not considering actual use.As (the publication number: 103230740A), its invention carrys out nominal price disturbance by increasing eddy flow district, improves mixing condition, and it focuses on point is mainly also to promote mixed effect, and does not improve penetrability of the SNCR swirling flow atomizing spray gun with bluff body device.
Summary of the invention
The object of the invention is to overcome the weak point in prior art, a kind of SNCR denitrating flue gas spray gun and two-chamber hybrid double-layer spray technology thereof are provided, this technique can make spray gun both have high-penetrability, can realize strong atomizing effect again.
For achieving the above object, the present invention is by the following technical solutions:
A kind of SNCR denitrating flue gas spray gun and two-chamber hybrid double-layer spray technology thereof, its spray gun is by central-injection pipe, outer annular playpipe, reducing agent is carried pipeline section, blowpipe section forms, central-injection pipe front end is provided with central-injection mouth, rear end is provided with the first hybrid chamber and reducing agent is carried pipeline section and blowpipe section, between blowpipe section and the first hybrid chamber, be provided with transfer pipeline, the sidewall of transfer pipeline is provided with connecting pipeline and is communicated with the second hybrid chamber of outer annular playpipe; It is peripheral that outer annular playpipe is located at central-injection pipe, and front end is provided with annular spray Kou， rear end and is provided with the second hybrid chamber, between the second hybrid chamber and the first hybrid chamber of central-injection pipe, is provided with unilaterally connected pipeline; At reducing agent, carry pipeline section to be provided with reducing agent flow control valve and Pressure gauge, in blowpipe section, be provided with air velocity control valve and Pressure gauge.
A kind of SNCR denitrating flue gas spray gun and two-chamber hybrid double-layer spray technology thereof, its spray technology is, the compressed air that the reducing agent being entered by reducing agent conveying pipeline section and blowpipe section enter mixes at the first hybrid chamber, most of gas-liquid mixture enters central-injection pipe, through central-injection mouth, sprays in smoke treatment;
The gas-liquid mixture of part the first hybrid chamber enters the second hybrid chamber by unilaterally connected pipeline, the Partial shrinkage air that blowpipe section enters is without the first hybrid chamber, directly by connecting pipeline, enter the second hybrid chamber, the gas-liquid mixture of the second hybrid chamber sprays in smoke treatment through outer annular playpipe to annular spray mouth.
The aperture ratio of the aperture of the connecting pipeline that the sidewall of the transfer pipeline between blowpipe section and the first hybrid chamber as above is provided with and the transfer pipeline that is provided with between blowpipe section and the first hybrid chamber is 0.3-0.42.
The aperture ratio of the unilaterally connected pipeline being provided with between central-injection Guan aperture as above and the second hybrid chamber and the first hybrid chamber is 0.5-0.58.
Compressed air inlet pressure adjustable range is 0.2-0.35MPa.
The first hybrid chamber consists of reducing agent and compressed air, the second hybrid chamber consists of gas-liquid mixture and the compressed air of the first hybrid chamber, two kinds of gas-liquid mixtures that the mixing of employing two-chamber can obtain reducing agent, compressed air different component are to complete different jeting effects, bilayer sleeve can effectively utilize the different feature of gas-liquid mixture component in two hybrid chambers, prevents that two kinds of gas-liquid mixtures from influencing each other.
Two hybrid chambers of the inner employing of spray gun, and two hybrid chambers adopt split-type design, cannot bidirectional circulating between two chambeies, in gas-liquid mixture in two hybrid chambers, reducing agent is different with compressed-air actuated ratio, can realize gas-liquid mixture in the first hybrid chamber stronger penetration power, the atomization that the second hybrid chamber is stronger because tolerance has can be provided more.
In the technical program, adopt two hybrid chambers to produce different two kinds of reducing agents, the compressed air mixtures of constituent content.Reducing agent carries pipeline section to enter the first hybrid chamber by reducing agent, and compressed air partly enters the first hybrid chamber by compressed air pipeline section, and a part enters the second hybrid chamber in addition.Reducing agent and compressed air mixing rear section are directly sprayed in flue gas by central-injection mouth, and part enters the second hybrid chamber mixes with compressed air again, and the reducing agent of the second hybrid chamber, compressed air directly spray in flue gas by annular spray mouth.Reducing agent in the second hybrid chamber, compressed air are compared with the first hybrid chamber, and its compressed air content is higher, and its object is mainly better reducing agent to be carried out to atomization, coordinate annular spray mouth to promote the dispersiveness of gas-liquid mixture simultaneously.
In the technical program, adopt bilayer sleeve injection equipment.Corresponding the first hybrid chamber of central-injection pipe, corresponding the second hybrid chamber of annular spray pipe, central-injection pipe and annular spray pipe are without connected component.
In the technical program, by adjusting the aperture ratio of distribution pipeline, can regulate in the first hybrid chamber and the second hybrid chamber reducing agent and compressed-air actuated ratio in gas and liquid mixture, thereby meet different operating modes.
Beneficial effect: compared with prior art, the present invention has the following advantages: spray gun is inner containing two hybrid chambers, and two hybrid chambers adopt between split-type design ，Liang chambeies cannot bidirectional circulating, make in the gas-liquid mixture in two hybrid chambers reducing agent different with compressed-air actuated ratio.In order to guarantee that gas-liquid mixture in two hybrid chambers meets all the time, require separately to spray, both do not mix, and have adopted double-layer injection to carry out two different hybrid chambers of corresponding component.By adjusting the aperture ratio of connecting pipeline, can regulate in the first hybrid chamber and the second hybrid chamber reducing agent and compressed-air actuated ratio in gas and liquid mixture.
Two kinds of gas-liquid mixtures that the mixing of employing two-chamber can obtain reducing agent, compressed air different component are to complete different jeting effects, bilayer sleeve injection equipment can effectively utilize the different feature of gas-liquid mixture component in two hybrid chambers, prevents that two kinds of gas-liquid mixtures from influencing each other.
Accompanying drawing explanation
Fig. 1 is the organigram of a kind of SNCR denitrating flue gas spray gun of the present invention and two-chamber hybrid double-layer spray technology thereof
Fig. 2 A is the second hybrid chamber and outlet connecting portion structure signal enlarged drawing thereof in the present invention
Fig. 2 B is the second hybrid chamber and compressed air branch pipeline section connecting portion structure signal enlarged drawing in the present invention
Fig. 3 is the workflow diagram of a kind of SNCR denitrating flue gas spray gun of the present invention and two-chamber hybrid double-layer spray technology thereof
In figure, 1-reducing agent carry pipeline section, 2-blowpipe section, 3-transfer pipeline, 4-connecting pipeline, 5-outer annular playpipe, 6-annular spray mouth, 7-central-injection mouth, 8-central-injection pipe, 9-the second hybrid chamber, 10-unilaterally connected pipeline, 11-the first hybrid chamber,
the-the first hybrid chamber reducing agent, compressed air,
the-the second hybrid chamber reducing agent, compressed air,
-reducing agent,
-compressed air.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As shown in Figure 1, a kind of SNCR denitrating flue gas spray gun, by central-injection pipe, outer annular playpipe, reducing agent is carried pipeline section, and blowpipe section forms, central-injection pipe 8 front ends are provided with central-injection mouth 7, rear end is provided with the first hybrid chamber 11 and reducing agent is carried pipeline section 1 and blowpipe section 2, between blowpipe section 2 and the first hybrid chamber 11, is provided with transfer pipeline 3, and the sidewall of transfer pipeline 3 is provided with connecting pipeline 4 and is communicated with the second hybrid chamber 9 of outer annular playpipe; Outer annular playpipe 5 is located at central-injection pipe 8 peripheries, and front end is provided with annular spray mouth 6, and rear end is provided with between the second hybrid chamber 9, the second hybrid chambers and the first hybrid chamber of central-injection pipe and is provided with unilaterally connected pipeline 10; At reducing agent, carry pipeline section to be provided with reducing agent flow control valve and Pressure gauge, in blowpipe section, be provided with air velocity control valve and Pressure gauge.
As shown in Fig. 2 A, 2B, the second hybrid chamber 9 is the cavity of ring central-injection pipe 8, reducing agent in the second hybrid chamber 9, compressed air do not contact with reducing agent, compressed air in central-injection pipe 8, and reducing agent, compressed air in the second hybrid chamber 9 directly enter outer annular playpipe 5.Because central-injection pipe 8 and outer annular playpipe 5 are respectively from the second hybrid chamber 9 and the first hybrid chamber 11, and the reducing agent in two systems, compressed-air actuated concrete component are different, therefore the reducing agent, the compressed air that have produced central-injection pipe 8 have the more feature of strong penetrating power, and outer annular playpipe 5 is because air supply makes more greatly its reducing agent, compressed air have more dispersiveness in the second hybrid chamber 9.
As shown in Figure 3, the two-chamber hybrid double-layer spray technology of SNCR denitrating flue gas spray gun, the compressed air that the reducing agent being entered by reducing agent conveying pipeline section 1 and blowpipe section 2 enter mixes at the first hybrid chamber 11, most of gas-liquid mixture enters central-injection pipe 8, through central-injection mouth 7, sprays in smoke treatment; The gas-liquid mixture of part the first hybrid chamber 11 enters the second hybrid chamber 9 by unilaterally connected pipeline 10, the Partial shrinkage air that blowpipe section 2 enters is without the first hybrid chamber, the gas-liquid mixture that directly enters the second hybrid chamber 9, the second hybrid chambers 9 by connecting pipeline 4 sprays in smoke treatment through outer annular playpipe 5 to annular spray mouth 6.
Arrow has indicated respectively the flow direction of reducing agent, compressed air, the first hybrid chamber gas-liquid mixture and the second hybrid chamber gas-liquid mixture, and the reducing agent of entrance and compressed air enter the first hybrid chamber, enter after sufficiently mixing central-injection pipe.The gas-liquid mixture that consists of the first hybrid chamber of gas-liquid mixture and Partial shrinkage air that compressed air inlet enters in the second hybrid chamber.The component difference of two hybrid chambers is also to be caused by import thing qualitative difference.
The aperture ratio of the aperture of the connecting pipeline 4 that the sidewall of the transfer pipeline between blowpipe section and the first hybrid chamber as above is provided with and the transfer pipeline 3 that is provided with between blowpipe section and the first hybrid chamber is 0.3-0.42.
The aperture ratio of the unilaterally connected pipeline 10 being provided with between the aperture of central-injection pipe 8 as above and the second hybrid chamber and the first hybrid chamber is 0.5-0.58.
Compressed air inlet pressure adjustable range is 0.2-0.35MPa.
In sum, the present invention can effectively be applicable to SNCR denitrating technique, can meet the required penetration power of technique, can form good dispersive property again.
Claims (5)
1. a SNCR denitrating flue gas spray gun and two-chamber hybrid double-layer spray technology thereof, spray gun is by central-injection pipe, outer annular playpipe, reducing agent is carried pipeline section, blowpipe section forms, it is characterized in that, central-injection pipe front end is provided with central-injection mouth, rear end is provided with the first hybrid chamber and reducing agent is carried pipeline section and blowpipe section, between blowpipe section and the first hybrid chamber, be provided with transfer pipeline, the sidewall of transfer pipeline is provided with connecting pipeline and is communicated with the second hybrid chamber of outer annular playpipe; It is peripheral that outer annular playpipe is located at central-injection pipe, and front end is provided with annular spray Kou， rear end and is provided with the second hybrid chamber, between the second hybrid chamber and the first hybrid chamber of central-injection pipe, is provided with unilaterally connected pipeline; At reducing agent, carry pipeline section to be provided with reducing agent flow control valve and Pressure gauge, in blowpipe section, be provided with air velocity control valve and Pressure gauge.
2. a kind of SNCR denitrating flue gas spray gun and two-chamber hybrid double-layer spray technology thereof according to claim 1, it is characterized in that: the compressed air that spray technology carries reducing agent that pipeline section (1) enters and blowpipe section (2) to enter by reducing agent mixes at the first hybrid chamber (11), most of gas-liquid mixture enters central-injection pipe (8), through central-injection mouth (7), sprays in smoke treatment;
The gas-liquid mixture of part the first hybrid chamber (11) enters the second hybrid chamber (9) by unilaterally connected pipeline (10), the Partial shrinkage air that blowpipe section (2) enters is without the first hybrid chamber, directly by connecting pipeline (4), enter the second hybrid chamber (9), the gas-liquid mixture of the second hybrid chamber (9) sprays in smoke treatment through outer annular playpipe (5) to annular spray mouth (6).
3. a kind of SNCR denitrating flue gas spray gun and two-chamber hybrid double-layer spray technology thereof according to claim 1, is characterized in that: the aperture ratio of the aperture of the connecting pipeline being provided with at the sidewall of the transfer pipeline between blowpipe section and the first hybrid chamber and the transfer pipeline being provided with between blowpipe section and the first hybrid chamber is 0.3-0.42.
4. a kind of SNCR denitrating flue gas spray gun and two-chamber hybrid double-layer spray technology thereof according to claim 1, is characterized in that, the aperture ratio of the unilaterally connected pipeline being provided with between central-injection Guan aperture and the second hybrid chamber and the first hybrid chamber is 0.5-0.58.
5. a kind of SNCR denitrating flue gas spray gun and two-chamber hybrid double-layer spray technology thereof according to claim 1, is characterized in that, compressed air inlet pressure adjustable range is 0.2-0.35MPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310446280.4A CN103506234B (en) | 2013-09-27 | 2013-09-27 | A kind of SNCR denitrating flue gas spray gun two-chamber hybrid double-layer spray technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310446280.4A CN103506234B (en) | 2013-09-27 | 2013-09-27 | A kind of SNCR denitrating flue gas spray gun two-chamber hybrid double-layer spray technology |
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| CN103506234A true CN103506234A (en) | 2014-01-15 |
| CN103506234B CN103506234B (en) | 2016-03-16 |
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| CN201310446280.4A Expired - Fee Related CN103506234B (en) | 2013-09-27 | 2013-09-27 | A kind of SNCR denitrating flue gas spray gun two-chamber hybrid double-layer spray technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113975949A (en) * | 2021-12-28 | 2022-01-28 | 山东东源新材料科技有限公司 | Flue gas denitration device in petrochemical industry and use method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4434942A1 (en) * | 1994-09-30 | 1996-04-04 | Noell Abfall & Energietech | Flue gas treatment |
| JP2000512903A (en) * | 1997-05-01 | 2000-10-03 | イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー | Spray nozzle and its use |
| DE102006001319A1 (en) * | 2006-01-09 | 2007-07-12 | Wurz, Dieter, Prof. Dr.-Ing. | Two-fluid nozzle with Lavalcharekteristik and with pre-division in the liquid supply |
| CN101287555A (en) * | 2005-10-07 | 2008-10-15 | 迪特尔·沃尔兹 | Atomizing nozzle for two substances |
| CN102688681A (en) * | 2012-05-25 | 2012-09-26 | 中国华能集团清洁能源技术研究院有限公司 | Air cooling type air atomization spray gun applicable to denitration by SNCR (selective non-catalytic reduction) method |
| CN102728208A (en) * | 2012-07-20 | 2012-10-17 | 湖南安普诺环保科技有限公司 | SNCR (Selective Non Catalytic Reduction) denitration automatic anti-blocking spray atomization spray gun device for smoke environment |
-
2013
- 2013-09-27 CN CN201310446280.4A patent/CN103506234B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4434942A1 (en) * | 1994-09-30 | 1996-04-04 | Noell Abfall & Energietech | Flue gas treatment |
| JP2000512903A (en) * | 1997-05-01 | 2000-10-03 | イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー | Spray nozzle and its use |
| CN101287555A (en) * | 2005-10-07 | 2008-10-15 | 迪特尔·沃尔兹 | Atomizing nozzle for two substances |
| DE102006001319A1 (en) * | 2006-01-09 | 2007-07-12 | Wurz, Dieter, Prof. Dr.-Ing. | Two-fluid nozzle with Lavalcharekteristik and with pre-division in the liquid supply |
| CN102688681A (en) * | 2012-05-25 | 2012-09-26 | 中国华能集团清洁能源技术研究院有限公司 | Air cooling type air atomization spray gun applicable to denitration by SNCR (selective non-catalytic reduction) method |
| CN102728208A (en) * | 2012-07-20 | 2012-10-17 | 湖南安普诺环保科技有限公司 | SNCR (Selective Non Catalytic Reduction) denitration automatic anti-blocking spray atomization spray gun device for smoke environment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113975949A (en) * | 2021-12-28 | 2022-01-28 | 山东东源新材料科技有限公司 | Flue gas denitration device in petrochemical industry and use method thereof |
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