CN210544281U - High-temperature-resistant and mixing-enhanced efficient SNCR (selective non-catalytic reduction) injection device - Google Patents
High-temperature-resistant and mixing-enhanced efficient SNCR (selective non-catalytic reduction) injection device Download PDFInfo
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- CN210544281U CN210544281U CN201920492200.1U CN201920492200U CN210544281U CN 210544281 U CN210544281 U CN 210544281U CN 201920492200 U CN201920492200 U CN 201920492200U CN 210544281 U CN210544281 U CN 210544281U
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Abstract
The utility model relates to a high-efficient SNCR injection apparatus of high temperature resistant and intensive mixture. The traditional SNCR spray gun has the defects of high-temperature deformation, small jet flow coverage area, poor mixing effect and the like. The reducing agent pipeline in the furnace is arranged in the cooling pipeline in the furnace, the reducing agent pipeline in the furnace adopts various arrangement forms to realize the full coverage of jet flow in the boiler, and the reinforced mixing device is arranged at the upstream or the downstream of the reducing agent jet flow area. The utility model has the advantages of it is following: firstly, the cooling system can ensure the continuous and stable operation of the injection system in the furnace. Secondly, the arrangement form of the injection pipeline in the furnace is diversified. Thirdly, the reinforced mixing device can reinforce the mixing of the flue gas and the reducing agent, and the denitration efficiency is improved. And fourthly, the multi-directional performance of the reducing agent injection direction can improve the multi-working-condition adaptability of one set of injection system. To sum up, the utility model discloses the transformation engineering volume is little, the operation is stable, need not the special messenger to operate, only need shut down during the inspection maintain can, equipment and operation maintenance are with low costs.
Description
Technical Field
The utility model relates to a high-efficient SNCR injection apparatus of high temperature resistant and intensive mixture belongs to boiler equipment exhaust pollutant control technical field.
Background
The selective non-catalytic reduction (SNCR) technology is characterized in that a reducing agent reacts with NOx in flue gas to generate pollution-free N without the action of a catalyst within a specific temperature window (about 850-1100 ℃), and2and H2And O, the purpose of removing NOx in the flue gas is realized, and the SNCR technology is widely applied due to the advantages of simple modification, small investment, low operation cost and the like, such as the Chinese patent with the application number of 201621017029.1. The SNCR has more application performance as a mature technical scheme, but some problems to be solved exist, wherein the SNCR spray gun is divided into two types and the main limiting factors are as follows:
(1) wall spray gun: fixed mounting relies on dilution water or compressed air's pressure to spray reductant and gets into furnace on the furnace wall, and is relatively great to power plant boiler furnace space, and wall formula spray gun efflux rigidity is serious not enough, and the mixed effect of reductant and flue gas is not good, and furnace central area reductant injection volume is low, and system denitration efficiency is lower.
(2) Retractable spray gun: the condition of deformation and even burning loss exists when the machine works in a high-temperature environment, and the complex failure rate of an actuating mechanism is high. The effect of mixing is better than wall formula spray gun, but the spray gun cooling problem is waited for to solve urgently, and the scholars propose the solution of spray gun cooling, and the technical problem who ignores wherein has: 1) air cooling, the amount of air required is very large; 2) the water cooling, the heat medium water after the cooling water heat absorption handles the degree of difficulty big, and the circulating water demand is big, and the heat medium water energy waste phenomenon is general. Both solutions make no use of the heat loss of the reductant injection zone due to injection, which is detrimental to the system thermal balance.
(3) The traditional reducing agent is sprayed into the furnace through dilution water or compressed air, the reaction window of the reducing agent is limited, the reducing agent is evaporated, pyrolyzed and wasted in the limited reaction window in the furnace, so that the reaction of the reducing agent is insufficient, and the denitration efficiency is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the above-mentioned not enough that exists among the prior art, and provide a high-efficient SNCR injection apparatus of high temperature resistant and intensive mixing of reasonable in design, it can be under the design operating mode steady operation at the inside injection system of furnace based on stable cooling system guarantees to arrange, simultaneously through arranging the intensive mixing that realizes reductant and flue gas at a plurality of injection points of furnace inside, according to the operation mode of the suitable adjustment injection apparatus of the change of boiler operation operating mode, realize injection system steady operation in high temperature environment, the load adaptability of system is more ideal when guaranteeing the mixed effect of reductant and flue gas.
The utility model provides a technical scheme that above-mentioned problem adopted is: a high-temperature-resistant and mixing-enhanced efficient SNCR (selective non-catalytic reduction) injection device comprises a boiler, and is characterized by further comprising a cooling pipeline in the boiler, a cooling liquid supply pipeline, a cooling liquid return pipeline, a reducing agent pipeline in the boiler, a reducing agent supply pipeline and a mixing-enhanced device; the cooling pipeline in the boiler penetrates through a boiler hearth, a plurality of cooling pipelines in the boiler are arranged, one end of the cooling pipeline in the boiler is connected with a cooling liquid supply pipeline, and the other end of the cooling pipeline in the boiler is connected with a cooling liquid return pipeline; a part of the reducing agent supply pipeline is arranged in the cooling liquid return pipeline, the reducing agent supply pipeline is connected with one end of a reducing agent pipeline in the furnace, and the other end of the reducing agent pipeline in the furnace is a closed end; the reducing agent pipeline in the furnace is arranged in the cooling pipeline in the furnace, and a reducing agent nozzle is arranged on the cooling pipeline in the furnace; and the downstream or the upstream of the flue gas of the jet flow area of the reducing agent nozzle is provided with a plurality of intensified mixing devices which are arranged on a cooling pipeline in the furnace.
Furthermore, the arrangement form of the reducing agent pipeline in the furnace in the cooling pipeline in the furnace is not limited to the form provided by the utility model, and the circular arc layout or the branch pipe layout can be adopted, and the cooling medium can be water but is not limited to water.
Further, the reducing agent nozzles comprise nozzles in the flue gas countercurrent direction and nozzles in the flue gas concurrent flow direction.
Furthermore, the intensified mixing device is in a star-shaped structure or a disc-shaped structure and the like, and is used for ensuring that NOx in the flue gas and the reducing agent are fully mixed and react in time in a limited reaction window.
The working principle is as follows: in the boiler, a reducing agent pipeline in the boiler stably works in a high-temperature environment under the protection of cooling liquid in a cooling pipeline in the boiler, the reducing agent is sprayed through a reducing agent nozzle, and the reducing agent is fully mixed with flue gas and reacts in a limited reaction window under the action of a reinforced mixing device.
Further, the cooling liquid is conveyed to a cooling pipeline in the furnace through a cooling liquid supply pipeline and is discharged through a cooling liquid return pipeline; the jet flow area of the reducing agent pipeline in the furnace can uniformly cover the whole smoke gas circulation section in the furnace under the action of the cooling liquid.
Furthermore, the cooling liquid can ensure that the temperature of a pipeline of an injection system in the boiler continuously and stably operates within a design range, the full coverage of an injection area in the boiler is realized through a branch pipe form and a plurality of nozzles, and the sufficient mixing of the reducing agent and the flue gas is ensured.
Furthermore, the number of the nozzles is set up, and the number of the nozzles is reasonably arranged according to parameters such as the flow area of the flue gas in the jet flow direction and the amount of the flue gas.
Furthermore, the reducing agent nozzles on the surface of the cooling pipeline in the single furnace can be arranged in opposite directions or in multiple directions, the reducing agent nozzles in different directions can be properly adjusted and opened according to the change of the smoke temperature of the injection region in the multiple-arrangement mode, the nozzles in the smoke countercurrent direction are opened under high load, and the nozzles in the smoke concurrent direction are opened under low load.
Furthermore, the intensified mixing device is arranged in the downstream direction or the upstream direction of the flue gas in the injection area, so that the mixing effect of the flue gas and the reducing agent is intensified, the reducing agent and NOx in the flue gas are ensured to be fully reacted in a limited reaction window, and the denitration efficiency is improved. The reinforced mixing device can be made of high-temperature-resistant alloy materials or ceramics and other materials.
Compared with the prior art, the utility model, have following advantage and effect: firstly, the cooling liquid can effectively ensure that the temperature of the injection system in the furnace meets the design requirements, and guarantee is provided for the continuous and stable operation of the system. Secondly, under the protection of the cooling system, various in-furnace injection pipeline arrangement modes can be provided according to specific conditions. Thirdly, the reinforced mixing device can reinforce the mixing of the flue gas and the reducing agent, ensure that the reducing agent and the NOx are fully reacted in a limited reaction window, and improve the denitration efficiency. Fourthly, due to the multidirectional arrangement of the injection direction of the reducing agent, the multi-working-condition adaptability of a set of injection system can be improved, and the operation stability of equipment is improved to the maximum extent; to sum up, the utility model discloses the transformation engineering volume is little, the operation is stable, need not the special messenger to operate, only need shut down during the inspection maintain can, equipment operation and maintenance cost are low.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.
FIG. 2 is a schematic longitudinal section of a furnace chamber of the injection system in the embodiment of the present invention.
FIG. 3 is a schematic diagram of the structure of the cooling pipeline, the reducing agent pipeline and the reducing agent nozzle in the furnace according to the embodiment of the present invention.
In the figure: the system comprises a boiler 1, a furnace cooling pipeline 2, a cooling liquid supply pipeline 21, a cooling liquid return pipeline 22, a furnace reducing agent pipeline 3, a reducing agent supply pipeline 31, a reducing agent nozzle 4, a flue gas countercurrent direction nozzle 41, a flue gas downstream direction nozzle 42 and an intensified mixing device 5.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
Referring to fig. 1 to 3, in this embodiment, a high-temperature-resistant and mixing-enhanced efficient SNCR injection device is disposed at the upper portion of a furnace of a boiler 1, a temperature range meets design requirements, a reducing agent pipeline 3 in the boiler is disposed inside a cooling pipeline 2 in the boiler, so as to ensure that the working temperature of a pipeline system in the boiler meets the design requirements, a certain amount of heat in the region is taken away by the flow of cooling liquid inside the cooling pipeline 2 in the boiler, under the protection of the cooling liquid, the reducing agent pipeline 3 in the boiler can adopt various arrangement forms as required, so as to achieve full coverage of a reducing agent jet flow in the boiler 1, and a mixing-enhanced device 5 can ensure sufficient mixing of the reducing agent and flue gas in a limited.
In the present embodiment, the high-temperature-resistant and mixing-enhanced SNCR injection device includes a furnace cooling line 2, a coolant supply line 21, a coolant return line 22, a furnace reducing agent line 3, a reducing agent supply line 31, and a mixing-enhanced device 5.
The in-furnace cooling pipeline 2 penetrates through a hearth of the boiler 1, a plurality of in-furnace cooling pipelines 2 are arranged, one end of each in-furnace cooling pipeline 2 is connected with a cooling liquid supply pipeline 21, and the other end of each in-furnace cooling pipeline 2 is connected with a cooling liquid return pipeline 22; a part of the reducing agent supply pipeline 31 is arranged in the cooling liquid return pipeline 22, the reducing agent supply pipeline 31 is connected with one end of the reducing agent pipeline 3 in the furnace, and the other end of the reducing agent pipeline 3 in the furnace is a closed end; the reducing agent pipeline 3 in the furnace is arranged in the cooling pipeline 2 in the furnace, a reducing agent nozzle 4 is arranged on the cooling pipeline 2 in the furnace, the reducing agent pipeline 3 in the furnace is communicated with the reducing agent nozzle 4 through a branch pipe, and the reducing agent nozzle 4 is arranged on the surface of the cooling pipeline 2 in the furnace; the downstream or the upstream of the flue gas in the jet flow area of the reducing agent nozzle 4 is provided with a plurality of intensified mixing devices 5, and the intensified mixing devices 5 are fixed on the cooling pipeline 2 in the furnace through metal components. The intensified mixing device 5 is in a star-shaped structure or a disc-shaped structure and the like and is used for ensuring that NOx in the flue gas and the reducing agent are fully mixed and react in time in a limited reaction window.
The working process is as follows:
in the boiler 1, a reducing agent pipeline 3 in the boiler stably works in a high-temperature environment under the protection of cooling liquid in a cooling pipeline 2 in the boiler, the reducing agent is sprayed through a reducing agent nozzle 4, and the reducing agent and flue gas are fully mixed and react in a limited reaction window under the action of a reinforced mixing device 5.
The cooling liquid is conveyed to the cooling pipeline 2 in the furnace through a cooling liquid supply pipeline 21, and is used by a reducing agent injection system in the furnace after being cooled down through a cooling liquid return pipeline 22; the jet flow area of the reducing agent pipeline 3 in the furnace can uniformly cover the whole smoke gas circulation section in the furnace under the action of the cooling liquid. The reducing agent is injected into the boiler 1 after entering the reducing agent pipe 3 from the reducing agent supply pipe 31.
The reducing agent nozzle 4 comprises a nozzle 41 in the smoke countercurrent direction and a nozzle 42 in the smoke concurrent direction, the nozzles in different directions are adjusted and opened according to the change of the smoke temperature of the injection region, the nozzle 41 in the smoke countercurrent direction is opened under high load, and the nozzle 42 in the smoke concurrent direction is opened under low load.
Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications and alterations made by those skilled in the art without departing from the spirit and scope of the present invention should fall within the scope of the present invention.
Claims (3)
1. A high-temperature-resistant and mixing-enhanced efficient SNCR (selective non-catalytic reduction) injection device comprises a boiler (1), and is characterized by further comprising a cooling pipeline (2) in the boiler, a cooling liquid supply pipeline (21), a cooling liquid return pipeline (22), a reducing agent pipeline (3) in the boiler, a reducing agent supply pipeline (31) and a mixing-enhanced device (5); the cooling pipeline (2) in the boiler penetrates through a hearth of the boiler (1), a plurality of cooling pipelines (2) in the boiler are arranged, one end of each cooling pipeline (2) in the boiler is connected with a cooling liquid supply pipeline (21), and the other end of each cooling pipeline (2) in the boiler is connected with a cooling liquid return pipeline (22); a part of the reducing agent supply pipeline (31) is arranged in the cooling liquid return pipeline (22), the reducing agent supply pipeline (31) is connected with one end of the reducing agent pipeline (3) in the furnace, and the other end of the reducing agent pipeline (3) in the furnace is a closed end; the reducing agent pipeline (3) in the furnace is arranged in the cooling pipeline (2) in the furnace, and a reducing agent nozzle (4) is arranged on the cooling pipeline (2) in the furnace; the intensified mixing device (5) is provided with a plurality of intensified mixing devices (5), and the intensified mixing devices (5) are arranged on the cooling pipeline (2) in the furnace.
2. The high temperature resistant and mixing enhanced high efficiency SNCR injection device according to claim 1, wherein the reductant nozzle (4) comprises a flue gas counter-current direction nozzle (41) and a flue gas co-current direction nozzle (42).
3. The high-temperature-resistant mixing-enhanced high-efficiency SNCR injection device according to claim 1, wherein the mixing-enhanced device (5) is of a star-shaped structure or a disc-shaped structure and is used for ensuring that NOx in flue gas and a reducing agent are fully mixed and react in time in a limited reaction window.
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| CN201920492200.1U CN210544281U (en) | 2019-04-12 | 2019-04-12 | High-temperature-resistant and mixing-enhanced efficient SNCR (selective non-catalytic reduction) injection device |
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| CN201920492200.1U CN210544281U (en) | 2019-04-12 | 2019-04-12 | High-temperature-resistant and mixing-enhanced efficient SNCR (selective non-catalytic reduction) injection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110064285A (en) * | 2019-04-12 | 2019-07-30 | 华电电力科学研究院有限公司 | A kind of high temperature resistant and the efficient SNCR injection apparatus and its working method for strengthening mixing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110064285A (en) * | 2019-04-12 | 2019-07-30 | 华电电力科学研究院有限公司 | A kind of high temperature resistant and the efficient SNCR injection apparatus and its working method for strengthening mixing |
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