CN202823144U - Spray gun used for selective non-catalytic reduction (SNCR) and SNCR-selective catalytic reduction (SCR) denitration - Google Patents
Spray gun used for selective non-catalytic reduction (SNCR) and SNCR-selective catalytic reduction (SCR) denitration Download PDFInfo
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- CN202823144U CN202823144U CN 201220370099 CN201220370099U CN202823144U CN 202823144 U CN202823144 U CN 202823144U CN 201220370099 CN201220370099 CN 201220370099 CN 201220370099 U CN201220370099 U CN 201220370099U CN 202823144 U CN202823144 U CN 202823144U
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Abstract
The utility model discloses a spray gun used for selective non-catalytic reduction (SNCR) and SNCR-selective catalytic reduction (SCR) denitration. The spray gun used for the SNCR and SNCR-SCR denitration comprises an air inlet pipe, wherein one end of the air inlet pipe is provided with a nozzle, and the other end of the air inlet pipe is provided with a liquid inlet pipe in a penetrating mode. An air inlet cavity is arranged between the outer wall of the liquid inlet pipe and the inner wall of the air inlet pipe. The nozzle comprises a shell body, a mixing cavity, a liquid inlet branch pipe, an air inlet branch pipe and at least two spouts, wherein the mixing cavity is located inside the shell body, one end of the liquid inlet branch pipe is communicated with the mixing cavity, the other end of the liquid inlet branch pipe is communicated with the liquid inlet pipe, one end of the air inlet branch pipe is communicated with the mixing cavity, the other end of the air inlet branch pipe is communicated with the air inlet cavity, the at least two spouts are arranged at the end face position of the air inlet pipe and are communicated with the mixing cavity. The spray gun used for the SNCR and SNCR-SCR denitration is reasonable in structure and capable of reducing abrasion of flue gas and solid particles in the flue gas to the nozzle and effectively controlling the particle size and the spraying velocity of atomizing particles of reducing agents. The penetration distance and the particle evaporation time are arranged according to a practical situation, the reducing agents and the flue gas are enabled to be mixed evenly and be reacted, and the efficiency of flue gas denitration is improved.
Description
Technical field
The utility model relates to gas cleaning denitration device field, is specifically related to a kind of spray gun for SNCR and SNCR-SCR denitration.
Background technology
Along with improving constantly of national requirements for environmental protection, standard limit of smog release increasingly stringent, denitrating flue gas become present one large focus.Main gas denitrifying technology has following several at present: selective catalytic reduction (SCR), SNCR method (SNCR), SNCR and SCR combination method (SNCR-SCR), oxidation liquid absorption process, microbial method, active carbon adsorption, electronic beam method etc.Wherein, first three methods is the industrial method of generally using in the world at present, but these three kinds of methods respectively have its weak point.
The SCR method is method of denitration the most commonly used at present, under the effect of catalyst, by reducing agents such as ammonia, urea NOx is changed into the natural nitrogen G﹠W that contains in the air, the method denitration efficiency is high, secondary pollution is little, but catalyst costs accounts for about half of SCR system initial outlay usually, and catalyst in use can because of poison, that abrasion was lost efficacy etc. was former thereby need to change, thereby existed the shortcoming that operating cost is high, equipment investment is large.
SNCR is not having under the catalyst action, sprays into reducing agent in 900～1100 ℃ of burner hearths, take burner hearth as reactor, and reducing agent NH
3(or be vaporized into NH
3Or pyrolysis becomes NH rapidly
3) generate nitrogen with NOx reaction in the flue gas, having a certain amount of oxygen in the burner hearth exists, the reducing agent that sprays into optionally reacts with NOx, and very slow with the oxygen reaction reaction speed, the method does not need catalyst, the one-time investment expense is less, but because reaction temperature is high, higher to the designing requirement of spray gun and system, if design unreasonable, then denitration efficiency is lower, also exists the danger of the escaping of ammonia.At present, use the situation of SNCR method from engineering, most of spray guns exist droplet skewness, penetration range deficiency and spray gun easy to wear three large shortcomings, thereby cause reducing agent to mix the uneven denitration efficiency that reduces with flue gas.
The SNCR-SCR denitration technology is not to be the simple combination of SCR technology and SNCR technology, and it is to combine the characteristics that SCR technique to high-efficiency, SNCR technological investment economize and a kind of novel process that grows up.But also inherited the technological difficulties of some SNCR and SCR, for example sprayed into hybrid technology and also be faced with the predicament the same with SNCR, to the Technology design of spray gun and system is had relatively high expectations.
Application number is that 2011100407546 Chinese invention patent application discloses a kind of SNCR denitration multiinjector spear injector, comprise rifle body assembly and at least two nozzles, rifle body assembly comprises conduit assembly, input module and rifle head, and conduit assembly comprises coolant intake pipe, urea tube, air hose and coolant outlet hose from inside to outside successively; Input module comprises water supply connector, urea joint, pneumatic fitting and water out adapter, the rifle head comprise the urea end socket, be arranged on the air end socket of the air hose port of export and be arranged on the coolant outlet hose entrance point and the coolant outlet end between the cooling water end socket, nozzle is the internal-mixing nozzle that is arranged on the rifle body assembly, the mixing chamber of nozzle communicates with urea chamber and air chamber respectively, and the spout of nozzle is opened on the coolant outlet hose sidewall.The nozzle of this device is arranged on the both sides of conduit assembly, and its rifle body will go deep in burner hearth or the flue during injection reduction agent, although skin scribbles the corrosion and wear material, is difficult to long-time steady operation in the large flue gas of dustiness.
Application number is that 200810156399.7 Chinese invention patent application discloses a kind of reductant nozzle for the denitration of SNCR method, it is a kind of nozzle of liquid liquid mixed aerosol, comprise supervisor, looped pipeline, cutting ferrule, fluid flow tube and nozzle, cutting ferrule and looped pipeline link to each other by screw thread and form relatively airtight space, supervisor's front end is equipped with nozzle, and place in the looped pipeline, the front end of nozzle contacts with cutting ferrule; Supervisor the rear end with interlink with manometric fluid flow tube I; Looped pipeline with interlink with manometric fluid flow tube II; Be provided with along charge shaft to the mix aperture that connects at nozzle, and offer the hole that several are communicated with mix aperture and looped pipeline; Nozzle and cutting ferrule at mix aperture liquid outlet place offer the olive shape ejiction opening.This reductant nozzle is positioned at the leading portion of pipeline, but this nozzle adopts single spout and its spout to adopt olive shape, easily causes atomizing particle particle diameter skewness, affects mixed effect.
The utility model content
The utility model provides a kind of spray gun for SNCR and SNCR-SCR denitration, it is rational in infrastructure, solid particle is to the wearing and tearing of nozzle in minimizing flue gas and the flue gas, can effectively control granularity and the jet velocity of the atomizing particle of reducing agent, according to actual conditions penetration range and particle evaporation time are set, make to mix in reducing agent and the flue gas and react, improve the efficient of denitrating flue gas.
A kind of spray gun for SNCR and SNCR-SCR denitration, comprise air inlet pipe, described air inlet pipe one end is provided with nozzle, the other end is equipped with feed tube, be inlet chamber between described feed tube outer wall and described air inlet pipe inwall, described nozzle comprises housing, is positioned at the hybrid chamber of housing, an end is communicated with feed liquor arm, an end that the other end is communicated with feed tube and is communicated with the air intake branch that the other end is communicated with inlet chamber and at least two spouts that are arranged on the air inlet pipe end and are communicated with hybrid chamber with hybrid chamber with hybrid chamber.
During work, spray gun of the present utility model runs through walling of flue and is installed on the flue inwall or runs through the reacting furnace hearth wall and be installed on the inboard wall of burner hearth, only needing the nozzle position to stretch in flue or the burner hearth gets final product, need not whole spray gun and stretch into center in flue or the burner hearth, liquid reducer is sent in the hybrid chamber by feed tube and feed liquor arm, gases at high pressure are sent in the hybrid chamber by air inlet pipe and air intake branch, liquid reducer and gases at high pressure mix in hybrid chamber, and then the spout from the spray gun front end sprays into the reducing agent atomizing flue or the burner hearth.
The magnitude setting of described spout can affect the ejection efficiency of reducing agent, and preferably, described spout is 3; More preferably, described spout is located along the same line.
Liquid reducer in hybrid chamber is owing to forming drop after the impact grinding of gases at high pressure, sprayed from the spout atomizing by gases at high pressure, in flue or burner hearth, mix with flue gas and react with nitrogen oxide in the flue gas, with the reduction of nitrogen oxide in the flue gas, spout is set to 3, makes the reducing agent droplet distribution even, and dispersion range is wide in same plane, area coverage is large, thereby flue gas evenly mixes and reaction.
In order to strengthen injection intensity and the atomizing effect of nozzle, preferably, described spout is truncated cone-shaped, and its inlet diameter is 1:1.05～1.5 with the ratio of outlet diameter; The outlet diameter of described spout is 1:1.5～4.0 with the ratio of the length of spout.
More preferably, described spout outlet diameter is 1:1.05～1.5 with the ratio of the diameter of described feed tube.The inlet diameter of spout refers to the diameter of spout and hybrid chamber connectivity part, and outlet diameter refers to the diameter in exit.
Spray in order to guarantee that reducing agent liquid and gases at high pressure can enter to mix in the hybrid chamber and can atomize through spout smoothly smoothly, the diameter of described feed liquor arm is 1:3.0～5.0 with the ratio of feed tube diameter.
More preferably, described air intake branch is truncated cone-shaped, and its inlet diameter is 1:1.1～1.2 with the ratio of outlet diameter.The inlet diameter of air intake branch refers to the diameter of air intake branch and inlet chamber connectivity part, and outlet diameter refers to the diameter with the hybrid chamber connectivity part.
Preferably, described feed liquor arm is axial arranged along feed tube, is mutually 30～60 degree angles between described air intake branch and the feed liquor arm.
In above-mentioned preferred size proportion, liquid clashes into wall in hybrid chamber broken, and is then again broken and mix under the impact of pressure-air.Therefore, reducing agent drop atomized particle size through the ejection of the utility model spray gun is 50～250 μ m, jet velocity can reach 35～55m/s, the drop that diameter is little just evaporates around being dispersed in nozzle, the drop that diameter is large arrives at the burner hearth depths of reacting furnace, because three spouts being arranged, makes the reducing agent dispersion range wide, area coverage is large, can evenly mix with flue gas and react.
Preferably, described air inlet pipe and the spray nozzle front end outside scribble the heat resistant and wear resistant layer, are beneficial to nozzle not frayed long-time steady operation in the flue gas environment of high temperature, the high wearing and tearing of high burn into.
The beneficial effects of the utility model:
(1) spray gun is no more than wall thickness perpendicular to wall installation and built-in length, solid particle is to the wearing and tearing of nozzle in minimizing flue gas and the flue gas, and stretching into the partial-air admission pipe and the nozzle outer end is provided with the heat resistant and wear resistant layer, be conducive to like this nozzle not frayed long-time steady operation in the flue gas environment of high temperature, the high wearing and tearing of high burn into.
(2) spray gun is provided with three spouts, makes the reducing agent droplet distribution even, and dispersion range is wide in same plane, and area coverage is large, thereby flue gas evenly mixes and reaction.
(3) spray gun structure is simple, can effectively control granularity and the jet velocity of the atomizing particle of reducing agent, can be for different flue sizes thereby can effectively control penetration range, nozzle entrance gas, liquid road pressure are 0.2～1.0MPa, the drop atomized particle size of ejection is 50～350 μ m, and jet velocity can reach 35～55m/s.
Description of drawings
Fig. 1 is the structural representation of utility model;
Fig. 2 is the A-A profile of Fig. 1;
Fig. 3 is that the B of Fig. 2 is to view.
Among the figure: 1 is that housing, 2 is that air inlet pipe, 3 is that feed tube, 4 is that inlet suction port, 5 is that liquid inlet joint, 6 is that spout, 7 is that hybrid chamber, 8 is that feed liquor arm, 9 is air intake branch.
The specific embodiment
Such as Fig. 1, Fig. 2 and shown in Figure 3, a kind of spray gun for SNCR and SNCR-SCR denitration, comprise air inlet pipe 2 and the feed tube 3 that places in the air inlet pipe 2, the tail end of air inlet pipe 2 (being the right-hand member among Fig. 1) bends inwards and is connected with the outer wall of feed tube 3, air inlet pipe 2 tail ends are carried out end-blocking, in air inlet pipe 2 inlet suction port 4 is set, air transporting arrangement is connected to this inlet suction port 4 by pipeline, the tail end of feed tube 3 (being the right-hand member among Fig. 1) arranges liquid inlet joint 5, the liquid reducer feedway is connected to this liquid inlet joint 5 by pipeline, the inner chamber of feed tube 3 is admission chamber, and the cavity between feed tube 3 outer walls and air inlet pipe 2 inwalls is inlet chamber.
The head of feed tube 3 wears in air inlet pipe 2, certain space, interval between the head end (being the left end among Fig. 1) of the head end of feed tube 3 (being the left end among Fig. 1) and air inlet pipe 2, in this space, nozzle is installed, whole nozzle is covered by air inlet pipe 2 inboards, and the head end end face is concordant with the head end end face of air inlet pipe 2.
Nozzle comprises housing 1, housing 1 one ends link to each other with the head end of feed tube 3 and feed tube 3 are carried out end-blocking, other end end face outward is fixedly connected with the wall of air inlet pipe 2, head end to air inlet pipe 2 carries out end-blocking, the housing 1 interior hybrid chamber 7 that arranges, the afterbody of hybrid chamber 7 (enclosure interior that namely connects feed tube 3 parts) is provided with the cylindrical cavity that is communicated to feed tube 3, this cylindrical cavity is feed liquor arm 8, this feed liquor arm 8 is axial arranged along feed tube 3, the both sides of hybrid chamber 7 are respectively equipped with air intake branch 9 and are communicated with inlet chamber, two air intake branches 9 are obliquely installed, be positioned at the both sides of feed liquor arm 8, and the angle between the feed liquor arm 8 is 30～60 degree, is 45 degree in the present embodiment.
Three 6, three spouts 6 of spout that are communicated with hybrid chamber 7 are set are located along the same line at housing 1 head end (namely with the concordant end of air inlet pipe 2 head ends) end face, all apply the heat resistant and wear resistant layer in the outside of the nozzle outside and air inlet pipe 2 front ends.
The diameter of liquid inlet joint 5 and feed tube 3 junctions is identical with the diameter of feed tube 3, and feed liquor arm 8 is the cylindrical cavity of internal diameter homogeneous, and the diameter of the diameter of feed liquor arm 8 and feed tube 3 is 1:4 in the present embodiment than being 1:3.0～5.0.
The inner chamber of air intake branch 9 is truncated cone-shaped, the ratio of its inlet diameter and outlet diameter is 1:1.1～1.2, be 1:1.2 in the present embodiment, the inlet diameter of air intake branch 9 refers to the diameter of air intake branch 9 and inlet chamber connectivity part, and outlet diameter refers to the diameter with hybrid chamber 7 connectivity parts.
The inner chamber of spout 6 is truncated cone-shaped, and the ratio of its inlet diameter and outlet diameter is 1:1.05～1.5, is 1:1.3 in the present embodiment; The outlet diameter of spout 6 is 1:1.5～4.0 with the ratio of the length of spout 6, is 1:3 in the present embodiment, and the inlet diameter of spout 6 refers to the diameter of the connectivity part of spout 6 and hybrid chamber 7, and outlet diameter refers to the diameter in exit.
The course of work of the present utility model is as follows:
The spray gun of present embodiment is installed on the reacting furnace hearth wall perpendicular to wall, only needing the nozzle bit position of spray gun to stretch in the burner hearth gets final product, and built-in length is no more than the burner hearth wall thickness, liquid reducer is by liquid inlet joint 5, feed tube 3 and feed liquor arm 8 are sent in the hybrid chamber 7, pressure-air is by inlet suction port 4, air inlet pipe 2 and air intake branch 9 are sent in the hybrid chamber 7, liquid reducer is broken into the drop of 50～250 μ m under the impact of pressure-air, and then the speed with 35～55m/s sprays from spout 6 atomizings under the effect of pressure-air, spray into the burner hearth depths, with the flue gas hybrid reaction in the burner hearth, spray gun is provided with three spouts, make the reducing agent droplet distribution even, dispersion range is wide in same plane, and area coverage is large, thereby flue gas evenly mixes and reaction.The outer heat resistant and wear resistant layer of nozzle makes nozzle not frayed long-time steady operation in the flue gas environment of high temperature, the high wearing and tearing of high burn into.
The utility model spray gun had both guaranteed denitration efficiency, made again the interior solid particle of burner hearth drop to minimum to the wearing and tearing of nozzle.
Claims (8)
1. spray gun that is used for SNCR and SNCR-SCR denitration, comprise air inlet pipe (2), described air inlet pipe (2) one ends are provided with nozzle, the other end is equipped with feed tube (3), be inlet chamber between described feed tube (3) outer wall and described air inlet pipe (2) inwall, it is characterized in that, described nozzle comprises housing (1), be positioned at the hybrid chamber (7) of housing (1), one end is communicated with the feed liquor arm (8) that the other end is communicated with feed tube (3) with hybrid chamber (7), one end is communicated with the air intake branch (9) that the other end is communicated with inlet chamber and at least two spouts (6) that are arranged on air inlet pipe (2) end and are communicated with hybrid chamber (7) with hybrid chamber (7).
2. spray gun according to claim 1 is characterized in that, described spout (6) is 3.
3. spray gun according to claim 2 is characterized in that, described spout (6) is located along the same line.
4. spray gun according to claim 3 is characterized in that, described spout (6) is truncated cone-shaped, and its inlet diameter is 1: 1.05～1.5 with the ratio of outlet diameter; The ratio of the length of the outlet diameter of described spout (6) and spout (6) is 1: 1.5～4.0.
5. spray gun according to claim 4 is characterized in that, the ratio of the diameter of described spout (6) outlet diameter and described feed tube (3) is 1: 1.05～1.5.
6. spray gun according to claim 5 is characterized in that, the ratio of the diameter of the diameter of described feed liquor arm (8) and feed tube (3) is 1: 3.0～5.0.
7. spray gun according to claim 6 is characterized in that, described air intake branch (9) is truncated cone-shaped, and its inlet diameter is 1: 1.1～1.2 with the ratio of outlet diameter.
8. spray gun according to claim 7 is characterized in that, described feed liquor arm (8) is axial arranged along feed tube (3), is mutually 30～60 degree angles between described air intake branch (9) and the feed liquor arm (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220370099 CN202823144U (en) | 2012-07-30 | 2012-07-30 | Spray gun used for selective non-catalytic reduction (SNCR) and SNCR-selective catalytic reduction (SCR) denitration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220370099 CN202823144U (en) | 2012-07-30 | 2012-07-30 | Spray gun used for selective non-catalytic reduction (SNCR) and SNCR-selective catalytic reduction (SCR) denitration |
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| Publication Number | Publication Date |
|---|---|
| CN202823144U true CN202823144U (en) | 2013-03-27 |
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|---|---|---|---|
| CN 201220370099 Expired - Lifetime CN202823144U (en) | 2012-07-30 | 2012-07-30 | Spray gun used for selective non-catalytic reduction (SNCR) and SNCR-selective catalytic reduction (SCR) denitration |
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| CN (1) | CN202823144U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103170231A (en) * | 2013-04-10 | 2013-06-26 | 南京西普水泥工程集团有限公司 | Spray gun specially for selective non-catalytic reduction (SNCR) denitration process |
| CN103301971A (en) * | 2013-06-24 | 2013-09-18 | 迈瑞尔实验设备（上海）有限公司 | Reactor nozzle for experimental devices |
| CN103623958A (en) * | 2013-12-12 | 2014-03-12 | 江西恒大高新技术股份有限公司 | Small-space coating spray gun |
| CN104001418A (en) * | 2014-05-23 | 2014-08-27 | 浙江莱梦德电力设备有限公司 | Improved type desulfurization and denitrification spray gun |
| CN107470049A (en) * | 2017-09-30 | 2017-12-15 | 江西远达环保有限公司 | Desulphurization denitration lance tube with anti-vaporization |
| CN107470050A (en) * | 2017-09-30 | 2017-12-15 | 江西远达环保有限公司 | Has the desulphurization denitration spray gun of cooling effect |
| CN111774220A (en) * | 2020-08-07 | 2020-10-16 | 昆明云仁轮胎制造有限公司 | Anti-adhesion treatment device and treatment method for tire tube |
| CN114669424A (en) * | 2022-03-15 | 2022-06-28 | 苏州西热节能环保技术有限公司 | Catalyst step loading method |
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2012
- 2012-07-30 CN CN 201220370099 patent/CN202823144U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103170231A (en) * | 2013-04-10 | 2013-06-26 | 南京西普水泥工程集团有限公司 | Spray gun specially for selective non-catalytic reduction (SNCR) denitration process |
| CN103301971A (en) * | 2013-06-24 | 2013-09-18 | 迈瑞尔实验设备（上海）有限公司 | Reactor nozzle for experimental devices |
| CN103301971B (en) * | 2013-06-24 | 2015-09-16 | 迈瑞尔实验设备（上海）有限公司 | A kind of experimental provision reactor nozzle |
| CN103623958A (en) * | 2013-12-12 | 2014-03-12 | 江西恒大高新技术股份有限公司 | Small-space coating spray gun |
| CN104001418A (en) * | 2014-05-23 | 2014-08-27 | 浙江莱梦德电力设备有限公司 | Improved type desulfurization and denitrification spray gun |
| CN104001418B (en) * | 2014-05-23 | 2016-02-03 | 姜建勇 | Modified form desulphurization denitration spray gun |
| CN107470049A (en) * | 2017-09-30 | 2017-12-15 | 江西远达环保有限公司 | Desulphurization denitration lance tube with anti-vaporization |
| CN107470050A (en) * | 2017-09-30 | 2017-12-15 | 江西远达环保有限公司 | Has the desulphurization denitration spray gun of cooling effect |
| CN107470049B (en) * | 2017-09-30 | 2023-04-18 | 江西远达环保有限公司 | Spray gun pipe with anti-vaporization function for desulfurization and denitrification |
| CN107470050B (en) * | 2017-09-30 | 2023-04-18 | 江西远达环保有限公司 | Spray gun with cooling effect for desulfurization and denitrification |
| CN111774220A (en) * | 2020-08-07 | 2020-10-16 | 昆明云仁轮胎制造有限公司 | Anti-adhesion treatment device and treatment method for tire tube |
| CN111774220B (en) * | 2020-08-07 | 2023-09-29 | 昆明云仁轮胎制造有限公司 | Anti-adhesion treatment device and treatment method for inner tube of tire |
| CN114669424A (en) * | 2022-03-15 | 2022-06-28 | 苏州西热节能环保技术有限公司 | Catalyst step loading method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Granted publication date: 20130327 |
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