CN210410146U - SNCR spray gun cooling and reducing agent evaporation pyrolysis system - Google Patents
SNCR spray gun cooling and reducing agent evaporation pyrolysis system Download PDFInfo
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- CN210410146U CN210410146U CN201920491936.7U CN201920491936U CN210410146U CN 210410146 U CN210410146 U CN 210410146U CN 201920491936 U CN201920491936 U CN 201920491936U CN 210410146 U CN210410146 U CN 210410146U
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Abstract
The utility model relates to a reducing agent evaporation pyrolysis system is united in SNCR spray gun cooling. The traditional SNCR spray gun has the problems of high-temperature deformation, small jet flow coverage area, poor continuous operation stability and the like. The utility model comprises a reducing agent injection and cooling system, an external reducing agent supply system, and an external cooling water and reducing agent heat exchange system. The stable operation of the injection system in the furnace is ensured under the action of the cooling system; the reducing agent gasification pyrolysis system can ensure that the liquid reducing agent is converted into a gaseous state, and avoid the liquid reducing agent from being evaporated and pyrolyzed in the furnace to miss a limited reaction window. The SNCR system has stable heat balance, and avoids the waste of heat of the refrigerant water after the refrigerant water absorbs high-grade heat in the furnace in the traditional water cooling technology. The primary air of the boiler is used as a conveying medium of the reducing agent, and the injection pressure and the injection temperature of the reducing agent are improved. The utility model discloses guaranteed injection system's operating temperature, guaranteed the thermal balance of SNCR system simultaneously, avoided the heat waste.
Description
Technical Field
The utility model relates to a SNCR spray gun cooling unites reductant evaporation pyrolysis system 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 defects in the prior art, and provides a reasonably designed SNCR spray gun cooling and reducing agent evaporation pyrolysis system, which ensures that an injection system arranged in a hearth can stably operate under a designed working condition based on a stable cooling system, and reasonably selects an injection scheme according to the working condition in a furnace; the reducing agent is evaporated and pyrolyzed by utilizing the heat medium water after the injection system is cooled, so that the heat absorbed by the cooling system in the furnace can be fully utilized, the heat absorbed by the reducing agent in the furnace through gasification is reduced, and the heat balance of the system is ensured; gaseous reducing agent sprays into the stove and reacts with NOx in the flue gas fast, guarantees that reducing agent and flue gas fully react in the limited temperature window, improves denitration efficiency.
The utility model provides a technical scheme that above-mentioned problem adopted is: the SNCR spray gun cooling combined reducing agent evaporation pyrolysis system comprises a boiler and is characterized by further comprising a reducing agent storage tank, a reducing agent supply pump, a reducing agent pyrolysis evaporator, a reducing agent air mixer, a reducing agent supply pipeline, a reducing agent injection pipeline, a cooling water supply pump, a refrigerant water supply pipeline, a heating medium water return pipeline, a pyrolysis evaporator emergency cooling water pump, a pyrolysis evaporator emergency cooling water return valve and an air flow regulating valve; the reducing agent storage tank, the reducing agent supply pump and the reducing agent pyrolysis evaporator are sequentially connected through a pipeline, a reducing agent system in the reducing agent pyrolysis evaporator is connected with a reducing agent air mixer, and a water coal system in the reducing agent pyrolysis evaporator is connected with a cooling water supply pump through a pipeline; the reducing agent air mixer is connected with a reducing agent supply pipeline, and the cooling water supply pump is connected with a refrigerant water supply pipeline; the cold medium water supply pipeline penetrates through the furnace wall of the boiler and is communicated with a hot medium water return pipeline outside the boiler, and the hot medium water return pipeline is connected with a water-coal system of the reducing agent pyrolysis evaporator; the reducing agent supply pipeline is partially arranged in the hot medium water backflow pipeline, the reducing agent supply pipeline and the hot medium water backflow pipeline are combined to form a reducing agent injection pipeline in the boiler hearth, and a nozzle is arranged on the surface of the reducing agent injection pipeline; the emergency cooling water pump of the pyrolysis evaporator is connected with the reducing agent pyrolysis evaporator through a pipeline, the emergency cooling water backflow valve of the pyrolysis evaporator is installed at the bottom of the reducing agent pyrolysis evaporator, and the air flow regulating valve is installed at the air inlet of the reducing agent air mixer.
Further, the reducing agent injection pipeline in the furnace can adopt various arrangement forms under the protection of a cooling system so as to meet the mixing requirement. The cooling system can ensure that the temperature of the injection system in the furnace meets the design requirement and continuously and stably operates, can consider various arrangement forms to realize the full coverage of the injection area in the furnace, and ensures the sufficient mixing of the reducing agent and the flue gas.
Preferably, the water inlet ends of the refrigerant water supply pipelines are respectively positioned at two opposite sides of the boiler.
Preferably, the water inlet ends of the hot medium water return pipelines are respectively positioned at two opposite sides of the boiler, the water inlet ends of the hot medium water return pipelines and the reducing agent supply pipeline are combined outside the boiler, the reducing agent supply pipeline is arranged inside part of the hot medium water return pipelines and then enters the boiler, the reducing agent supply pipeline inside the boiler is arranged inside the reducing agent injection pipeline, and the surface of the reducing agent injection pipeline is provided with a plurality of reducing agent injection holes.
The working method comprises the following steps: the stable operation of an injection system in the boiler is ensured by utilizing a cooling water system, meanwhile, the reducing agent in a reducing agent pyrolysis evaporator is pyrolyzed and gasified by utilizing the heat absorbed by cooling water in the boiler, and the gasified reducing agent is fully mixed with air in a reducing agent air mixer and is injected into a hearth under the action of high-temperature and high-pressure hot air; the heat balance can be realized in the whole system, the continuous and stable work of the reducing agent injection pipeline in a high-temperature environment is ensured, meanwhile, the reducing agent dilution water is not needed, the energy consumption of a large amount of water in the boiler due to the gasification and the heat absorption is avoided, and the reaction efficiency in a limited reaction window is improved; the heat absorbed by the cooling water system in the boiler is finally brought back into the boiler by the reducing agent, thereby ensuring the heat balance in the boiler to the maximum extent and effectively avoiding energy waste.
Furthermore, the cooling water supply pump supplies cooling water to the injection area in the furnace, absorbs heat to ensure that the temperature of the reducing agent injection system meets the design requirement, and simultaneously, the heat medium water enters the reducing agent pyrolysis evaporator to evaporate and pyrolyze the reducing agent flowing in the reducing agent pyrolysis evaporator into a gaseous state.
Furthermore, the cooling medium can be water but is not limited to water, and when the whole system operates stably, the temperature of the water medium in the reducing agent pyrolysis evaporator is stabilized at 500-600 ℃.
Further, the concentration of the reducing agent should be more than 40%, so that the reducing agent cannot be sufficiently gasified in the reducing agent pyrolysis evaporator due to too low concentration, the supply of the reducing agent is insufficient, and the NOx removal efficiency is reduced.
Further, the reducing agent enters the reducing agent air mixer along the axial direction and is dispersed out of the radial small holes, and the air enters the reducing agent air mixer along the tangential direction. To enhance the mixing of the vaporized reductant with air, the reductant-air mixer may be configured to resemble a cyclone structure, but is not limited to such a structure.
Furthermore, the air source of the reducing agent air mixer is high-temperature and high-pressure air which mainly plays the roles of conveying, reducing agent injection and avoiding reducing agent jet flow region temperature reduction caused by cold air to influence the reaction of the reducing agent and the flue gas in a limited temperature window, and the reaction efficiency of the system is improved to the maximum extent.
Preferably, the high-temperature and high-pressure air is primary air of a boiler, and may be secondary air or common compressed air.
Furthermore, an emergency cooling water supply system of the reducing agent pyrolysis evaporator ensures water replenishing and cooling of the reducing agent pyrolysis evaporator.
Furthermore, the related heat medium equipment and the pipeline are provided with heat preservation facilities, and heat tracing equipment can be considered to be arranged if necessary.
Compared with the prior art, the utility model, have following advantage and effect:
firstly, the spraying system in the furnace can be fully arranged as required under the action of the cooling system, and the stable operation in a high-temperature environment can be ensured. Secondly, the reducing agent gasification pyrolysis system can ensure that the liquid reducing agent is converted into a gaseous state and is injected into the furnace through a pipeline with pressure, so that the situation that the liquid reducing agent misses a limited temperature window in the evaporation pyrolysis process in the furnace and the denitration efficiency is reduced is avoided. Thirdly, the cooling system in the furnace and the evaporation pyrolysis system outside the furnace ensure the stable heat balance of the SNCR system, and avoid the waste of refrigerant water or dilution water absorbing high-grade heat in the furnace in the traditional water cooling technology. Fourthly, primary air or secondary air of the boiler is used as a conveying medium of the reducing agent, the injection pressure and temperature of the reducing agent entering the boiler can be improved, high-pressure injection is favorable for improving jet rigidity, the reducing agent and flue gas are fully mixed, and high-temperature injection avoids the reducing agent from participating in reaction in a limited temperature window due to the fact that the temperature of a jet flow area is reduced by cold air;
to sum up, the utility model discloses guaranteed injection system's operating temperature guaranteed the thermal balance of SNCR system simultaneously, avoided the heat waste, need not external heating source, the operation is stable, equipment operation and maintenance cost are low.
The utility model discloses do and be applied to the combustion apparatus that the burning produced high concentration NOx (like W flame boiler or use lean coal boiler etc.) and realize "SNCR + SCR" technique of ultralow emission, the utility model discloses can improve SNCR denitration efficiency by a wide margin, reduce economizer export NOx concentration, reduce SCR equipment and exert oneself, reduce the operation maintenance cost, guarantee equipment economy, stably realize ultralow emission.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a reducing agent air mixer according to an embodiment of the present invention.
In the figure: the system comprises a reducing agent storage tank 1, a reducing agent supply pump 2, a reducing agent pyrolysis evaporator 3, a reducing agent air mixer 4, a reducing agent supply pipeline 5, a reducing agent injection pipeline 6, a cooling water supply pump 7, a refrigerant water supply pipeline 8, a heat medium water return pipeline 9, a pyrolysis evaporator emergency cooling water pump 10, a pyrolysis evaporator emergency cooling water return valve 11, an air flow regulating valve 12 and a boiler 13.
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. 1-2, the SNCR spray gun cooling and reducing agent evaporation pyrolysis system in the present embodiment includes an in-furnace reducing agent injection and cooling system, an out-furnace reducing agent supply system, and an out-furnace cooling water and reducing agent heat exchange system. The reducing agent pipeline in the furnace is arranged in the cooling liquid pipeline, so that the working temperature of the pipeline system in the furnace meets the design requirement, and the arrangement scheme of the reducing agent injection system in the furnace is reasonably determined according to the smoke condition in the furnace.
In this embodiment, SNCR spray gun cooling unites reductant evaporation pyrolysis system, including boiler 13, still include reductant storage tank 1, reductant supply pump 2, reductant pyrolysis evaporator 3, reductant air-fuel mixture 4, reductant supply pipe 5, reductant injection pipeline 6, cooling water supply pump 7, refrigerant water supply pipe 8, heat medium water backflow pipeline 9, the emergent cooling water pump 10 of pyrolysis evaporator, the emergent cooling water return valve 11 of pyrolysis evaporator, air flow control valve 12.
The reducing agent storage tank 1, the reducing agent supply pump 2 and the reducing agent pyrolysis evaporator 3 are sequentially connected through a pipeline, a reducing agent system in the reducing agent pyrolysis evaporator 3 is connected with a reducing agent air mixer 4, and a water coal system in the reducing agent pyrolysis evaporator 3 is connected with a cooling water supply pump 7 through a pipeline; the reducing agent air mixer 4 is connected with a reducing agent supply pipeline 5, and the cooling water supply pump 7 is connected with a coolant water supply pipeline 8; a refrigerant water supply pipeline 8 penetrates through the wall of the boiler 13 and is communicated with a heat medium water return pipeline 9 outside the boiler 13, and the heat medium water return pipeline 9 is connected with a water-coal system of the reducing agent pyrolysis evaporator 3; a part of the reducing agent supply pipeline 5 is arranged in the hot media water return pipeline 9, in a hearth of the boiler 13, the reducing agent supply pipeline 5 and the hot media water return pipeline 9 are combined to form a reducing agent injection pipeline 6, and a nozzle is arranged on the surface of the reducing agent injection pipeline 6; the pyrolysis evaporator emergency cooling water pump 10 is connected with the reducing agent pyrolysis evaporator 3 through a pipeline, a pyrolysis evaporator emergency cooling water return valve 11 is installed at the bottom of the reducing agent pyrolysis evaporator 3, and an air flow regulating valve 12 is installed at an air inlet of the reducing agent air mixer 4.
In this embodiment, the water inlet ends of the coolant water supply pipes 8 are respectively located at two opposite sides of the boiler 13. The water inlet ends of the heat medium water return pipelines 9 are respectively positioned at two opposite sides of the boiler 13, the water inlet ends of the heat medium water return pipelines 9 are converged with the reducing agent supply pipeline 5 outside the boiler 13, the reducing agent supply pipeline 5 is placed inside part of the heat medium water return pipelines 9 and then enters the boiler 13, the reducing agent supply pipeline 5 inside the boiler 13 is placed inside the reducing agent injection pipeline 6, and a plurality of reducing agent injection holes are formed in the surface of the reducing agent injection pipeline 6.
When the device works, a cooling water system is used for ensuring the stable operation of an injection system in the boiler 13, meanwhile, the heat absorbed by cooling water in the boiler 13 is used for pyrolyzing and gasifying the reducing agent in the reducing agent pyrolysis evaporator 3, the gasified reducing agent is fully mixed with air in the reducing agent air mixer 4 and is injected into a hearth under the action of high-temperature and high-pressure hot air; the heat balance can be realized in the whole system, the continuous and stable work of the reducing agent injection pipeline in a high-temperature environment is ensured, meanwhile, the reducing agent dilution water is not needed, the energy consumption of a large amount of water in the boiler 13 through gasification and heat absorption is avoided, and the reaction efficiency in a limited reaction window is improved; the heat absorbed by the cooling water system in the boiler 13 is finally brought back into the boiler by the reducing agent, thereby ensuring the heat balance in the boiler to the maximum extent and effectively avoiding energy waste.
After the whole system stably operates, the temperature of the aqueous medium in the reducing agent pyrolysis evaporator 3 is stabilized at 500-600 ℃. The emergency cooling water supply system of the reducing agent pyrolysis evaporator 3 ensures a water source required for water replenishment and temperature reduction of the reducing agent pyrolysis evaporator 3. The reducing agent enters the reducing agent air mixer 4 along the axial direction and is dispersed out of the radial small holes, and the air enters the reducing agent air mixer 4 along the tangential direction. The air source of the air flow regulating valve 12 is primary air or secondary air of a boiler.
The working process is as follows: under the action of a cooling water supply pump 7, cooling water enters each branch pipe through a refrigerant water supply pipeline 8, a reducing agent injection pipeline 6 in the cooling furnace returns to the reducing agent pyrolysis evaporator 3 through a heat medium water return pipeline 9, the reducing agent is evaporated and pyrolyzed by using heat absorbed by the cooling water in the furnace, the reducing agent is changed into a gas state from a liquid state, and the reducing agent is convenient to convey and mix.
The reducing agent is conveyed from the reducing agent storage tank 1 to the reducing agent pyrolysis evaporator 3 by the reducing agent supply pump 2, and the reducing agent is rapidly evaporated and pyrolyzed into gas or NH under the action of the heat medium water3The reducing agent subjected to evaporation pyrolysis enters a reducing agent air mixer 4, is fully mixed under the action of primary air of a boiler and then enters a reducing agent supply pipeline 5, the reducing agent supply pipeline 5 is divided into a plurality of branch pipes before entering the boiler, part of each branch pipe is arranged in a hot water return pipeline 9, two ends of a reducing agent injection pipeline 6 penetrate through the boiler wall of the boiler 13, the reducing agent supply pipeline 5 inside the reducing agent supply pipeline enters from one side and then is injected into a hearth along a nozzle arranged on the surface of the reducing agent injection pipeline 6 in the boiler, and the other end of the reducing agent supply pipeline 5 is a closed end.
The air of the reducing agent and air mixer is preferably used as primary air of a boiler, a branch pipe is led out from a primary air pipe of the boiler, an air flow regulating valve 12 is arranged, the air volume and the air pressure of the primary air are regulated according to the operating conditions such as load working conditions, and the injection pressure of the reducing agent is ensured to meet the design requirement, and the reducing agent and the flue gas are fully mixed. The hot primary air of the boiler passes through the air flow regulating valve 12 and then enters the reducing agent air mixer 4, the reducing agent and the dilution air are fully mixed in the reducing agent air mixer 4, and the mixed gas enters the reducing agent supply pipeline 5 and then is sprayed into the boiler.
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 (4)
1. The SNCR spray gun cooling combined reducing agent evaporation pyrolysis system comprises a boiler (13) and is characterized by further comprising a reducing agent storage tank (1), a reducing agent supply pump (2), a reducing agent pyrolysis evaporator (3), a reducing agent air mixer (4), a reducing agent supply pipeline (5), a reducing agent injection pipeline (6), a cooling water supply pump (7), a refrigerant water supply pipeline (8), a heat medium water backflow pipeline (9), a pyrolysis evaporator emergency cooling water pump (10), a pyrolysis evaporator emergency cooling water backflow valve (11) and an air flow regulating valve (12); the reducing agent storage tank (1), the reducing agent supply pump (2) and the reducing agent pyrolysis evaporator (3) are sequentially connected through pipelines, a reducing agent system in the reducing agent pyrolysis evaporator (3) is connected with the reducing agent air mixer (4), and a water coal system in the reducing agent pyrolysis evaporator (3) is connected with the cooling water supply pump (7) through a pipeline; the reducing agent air mixer (4) is connected with a reducing agent supply pipeline (5), and the cooling water supply pump (7) is connected with a refrigerant water supply pipeline (8); the cold medium water supply pipeline (8) penetrates through the wall of the boiler (13) and is communicated with a hot medium water return pipeline (9) outside the boiler (13), and the hot medium water return pipeline (9) is connected with a water-coal system of the reducing agent pyrolysis evaporator (3); part of the reducing agent supply pipeline (5) is arranged in the hot medium water return pipeline (9), the reducing agent supply pipeline (5) and the hot medium water return pipeline (9) are combined to form a reducing agent injection pipeline (6) in a boiler (13) hearth, and a nozzle is arranged on the surface of the reducing agent injection pipeline (6); the emergency cooling water pump (10) of the pyrolysis evaporator is connected with the reducing agent pyrolysis evaporator (3) through a pipeline, the emergency cooling water backflow valve (11) of the pyrolysis evaporator is installed at the bottom of the reducing agent pyrolysis evaporator (3), and the air flow adjusting valve (12) is installed at the air inlet of the reducing agent air mixer (4).
2. The SNCR lance cooling combined reductant evaporative pyrolysis system of claim 1, wherein the water inlet ends of the coolant water supply pipes (8) are respectively located on two opposite sides of the boiler (13).
3. The SNCR spray gun cooling combined reducing agent evaporation pyrolysis system according to claim 1, wherein water inlet ends of the heat medium water return pipelines (9) are respectively located on two opposite sides of the boiler (13), the water inlet ends of the heat medium water return pipelines (9) are merged with the reducing agent supply pipeline (5) outside the boiler (13), the reducing agent supply pipeline (5) is placed inside a part of the heat medium water return pipelines (9) and then enters the boiler (13), the reducing agent supply pipeline (5) inside the boiler (13) is placed inside the reducing agent injection pipeline (6), and a plurality of reducing agent injection holes are formed in the surface of the reducing agent injection pipeline (6).
4. The SNCR lance cooling combined reductant evaporative pyrolysis system of claim 1, wherein the air supply to the air flow control valve (12) is boiler primary air or secondary air.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110064286A (en) * | 2019-04-12 | 2019-07-30 | 华电电力科学研究院有限公司 | A kind of cooling joint reducing agent of SNCR spray gun evaporates pyrolysis system and its working method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110064286A (en) * | 2019-04-12 | 2019-07-30 | 华电电力科学研究院有限公司 | A kind of cooling joint reducing agent of SNCR spray gun evaporates pyrolysis system and its working method |
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