Water-cooled spray gun for SNCR (selective non-catalytic reduction) denitration and SNCR denitration device

Abstract

The invention discloses a water-cooled spray gun for SNCR (selective non-catalytic reduction) denitration and an SNCR denitration device, and relates to the technical field of denitration processes, the water-cooled spray gun comprises a water-cooled shell, a liquid guide pipe, an atomizing nozzle and a cooling water inlet pipe; the water-cooling shell is provided with a first end and a second end which are oppositely arranged, and a cooling water outlet is formed in the side wall, close to the first end, of the water-cooling shell. The multiple atomization nozzles are correspondingly installed at the multiple liquid outlets, and the spraying ends of the atomization nozzles penetrate through the side wall of the water-cooling shell and extend out of the water-cooling shell. A plurality of atomizing nozzles are arranged, a reducing agent is sprayed to all positions of the boiler, the contact area with flue gas is increased, the mixing uniformity with the flue gas is improved, the denitration efficiency is improved, the escape rate of the reducing agent is reduced, and the cost is reduced; cooling water is guided into the water-cooling shell through the cooling water inlet pipe, so that the cooling water fully flows on the peripheral sides of the liquid guide pipe and the atomization nozzle, the cooling efficiency of the liquid guide pipe and the atomization nozzle is enhanced, and the service life of the liquid guide pipe and the atomization nozzle is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of denitration technology, and more particularly to a SNCR denitration water-cooled spray gun and a SNCR denitration device. Background Art

[0002] The flue gas produced by coal-fired power generation boilers contains NO x , it is necessary to select a suitable flue gas denitrification device for denitrification treatment to meet the emission standards. The SNCR denitrification system has been favored by everyone because of its simple equipment, compact structure and low cost. In the SNCR denitrification system, the spray gun is one of the most core and critical components of the system. Its spray atomization effect and coverage area are directly related to the efficiency of system denitrification and the size of ammonia escape rate. However, most of the current SNCR denitrification spray guns use air and solution to directly mix and spray, and a nozzle is set at the end of the gun head. The spray flow shape is usually conical, and the contact area with the flue gas is small, which is difficult to mix evenly. The denitrification efficiency is low and the ammonia escape rate is high, resulting in the defect of waste of reducing agent. At the same time, the spray gun is installed in the boiler and is in direct contact with the high-temperature flue gas in the furnace, which is easy to damage. Some spray guns with cooling air or cooling water pipelines can only cool the spray gun body, and the nozzle is still exposed to the flue gas as a whole, with poor cooling effect and short spray gun life. Summary of the invention

[0003] In view of this, the present invention aims to provide a water-cooled spray gun for SNCR denitrification and an SNCR denitrification device to at least to some extent solve the defects of the existing spray guns, such as small contact area between the conical injection and the flue gas, difficulty in uniform mixing, low denitrification efficiency, high ammonia escape rate, poor spray gun cooling effect, and short spray gun life.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A water-cooled spray gun for SNCR denitration, comprising:

[0006] A water-cooled shell, the water-cooled shell having a first end and a second end arranged opposite to each other, the first end and the second end being arranged perpendicular to the exhaust direction of the boiler and fixed to the inner wall of the boiler, and a cooling water outlet being provided on the side wall arranged near the first end;

[0007] A liquid guide tube, the liquid guide tube is arranged in the inner cavity of the water-cooling shell in an axial direction parallel to the first end and the second end of the water-cooling shell, a feed end of the liquid guide tube passes through the end wall of the first end of the water-cooling shell, is fixed to and communicates with the reducing agent pipe joint and the compressed air pipe joint, and a plurality of liquid outlets are evenly spaced on the side wall along the axial direction thereof;

[0008] Atomizing nozzles, wherein a plurality of atomizing nozzles are correspondingly mounted at the plurality of liquid outlets, and the spray ends thereof penetrate the side wall of the water-cooling housing and extend to the outside of the water-cooling housing;

[0009] A cooling water inlet pipe, the cooling water inlet pipe is arranged in the inner cavity of the water-cooling shell along the first end and the second end of the water-cooling shell, the water inlet end of the cooling water inlet pipe passes through the end wall of the first end of the water-cooling shell, and the water outlet end extends to the second end of the water-cooling shell and communicates with the inner cavity of the water-cooling shell;

[0010] A cooling water drain pipe is installed at the cooling water outlet and communicated with the inner cavity of the water-cooled shell.

[0011] The beneficial effects that can be achieved by the present invention are as follows: by arranging a plurality of atomizing nozzles, the reducing agent is sprayed to various parts of the boiler, thereby increasing the contact area with the flue gas, improving the uniformity of mixing with the flue gas, improving the denitrification efficiency, reducing the reducing agent escape rate, and reducing the cost; at the same time, the liquid guide pipe and the atomizing nozzle are basically located in the inner cavity of the water-cooled shell, and the cooling water is introduced into the water-cooled shell by using the cooling water inlet pipe, so that the cooling water can fully flow around the liquid guide pipe and the atomizing nozzle, thereby enhancing the cooling efficiency of the liquid guide pipe and the atomizing nozzle and extending their service life.

[0012] Preferably, a filter is installed at the feed end of the liquid guiding tube.

[0013] Preferably, it further comprises an atomizing mixer, the discharge end of the atomizing mixer is connected to the feed end of the liquid guiding tube, and the feed end thereof is connected to both the reducing agent pipe joint and the compressed air pipe joint.

[0014] An SNCR denitration device comprises a reducing agent supply component, a compressed air supply component, a cooling water circulation component and a plurality of SNCR denitration water-cooled spray guns as described above;

[0015] The reducing agent supply assembly includes a reducing agent concentrate supply assembly, a dilution water supply assembly, a metering and mixing assembly, and a reducing agent distribution assembly; the discharge ends of the reducing agent concentrate supply assembly and the dilution water supply assembly are both connected to the feed end of the metering and mixing assembly; the feed end of the reducing agent distribution assembly is connected to the discharge end of the metering and mixing assembly;

[0016] Multiple water-cooled spray guns are evenly arranged along the smoke exhaust direction of the boiler and installed in the boiler, the reducing agent pipe joint of each water-cooled spray gun is connected to the discharge end of the reducing agent distribution assembly, the compressed air pipe joint is connected to the air outlet end of the compressed air supply assembly, the discharge end of the cooling water circulation assembly is connected to the feed end of the cooling water inlet pipe, and the reflux end is connected to the discharge end of the cooling water drain pipe.

[0017] The beneficial effects that can be achieved by the present invention are as follows: by fully mixing and diluting the reducing agent concentrate with the dilution water, and then re-metering and distributing it to each water-cooled spray gun, the uniformity of the reducing agent introduction amount in each spray gun is improved, the uniformity of mixing with the flue gas is enhanced, and the denitrification efficiency is enhanced.

[0018] Preferably, the reducing agent concentrate supply assembly comprises a reducing agent concentrate storage tank, a reducing agent delivery pipe and a reducing agent delivery pump, the reducing agent concentrate storage tank is connected to the metering and mixing assembly through the reducing agent delivery pipe, and the reducing agent delivery pump is installed on the reducing agent delivery pipe.

[0019] Preferably, the dilution water supply assembly includes a dilution water storage tank, a dilution water delivery pipe and a dilution water delivery pump, the dilution water storage tank is connected to the metering and mixing assembly through the dilution water delivery pipe, and the dilution water delivery pump is installed on the dilution water delivery pipe.

[0020] Preferably, the metering and mixing assembly includes a reductant flowmeter, a reductant regulating valve, a dilution water flowmeter, a dilution water regulating valve and a static mixer, the reductant flowmeter and the reductant regulating valve are both installed on the reductant delivery pipe, the dilution water flowmeter and the dilution water regulating valve are both installed on the dilution water delivery pipe, the discharge ends of the reductant delivery pipe and the dilution water delivery pipe are both connected to the feed end of the static mixer, and the discharge end of the static mixer is connected to the feed end of the reductant distribution assembly.

[0021] Preferably, the reductant distribution assembly includes a reductant distribution box, a plurality of reductant dilution liquid outlet pipes, a reductant dilution liquid regulating valve, a reductant dilution liquid flow meter and a hydraulic gauge; the reductant distribution box is fixed to the outer wall of the boiler; a plurality of the reductant dilution liquid outlet pipes are installed in parallel in the reductant distribution box, and their feed ends are all connected to the discharge ends of the static mixer; the discharge ends pass through the side wall of the reductant distribution box to be connected to the reductant pipe joint corresponding to the water-cooled spray gun; each of the reductant dilution liquid outlet pipes is provided with a reductant dilution liquid regulating valve, a reductant dilution liquid flow meter and a hydraulic gauge.

[0022] Preferably, the compressed air supply assembly includes a compressed air storage tank, a compressed air delivery pump, a compressed air delivery pipe, a compressed air distribution box and a plurality of compressed air distribution pipes, the air inlet end of the compressed air delivery pump is connected to the compressed air storage tank, one end of the compressed air delivery pipe is connected to the compressed air delivery pump, and the other end extends into the compressed air distribution box, and a plurality of compressed air distribution pipes are installed in parallel in the compressed air distribution box, the air inlet end of each compressed air distribution pipe is connected to the air outlet end of the compressed air delivery pump, and the air outlet end passes through the side wall of the compressed air distribution box to be connected to the compressed air pipe joint corresponding to the water-cooled spray gun.

[0023] Preferably, the cooling water circulation assembly includes a cooling water storage tank, a cooling water output pipe, a cooling water delivery pump and a cooling water return pipe. The cooling water storage tank is connected to the water inlet end of the cooling water inlet pipe through the cooling water output pipe. The cooling water delivery pump is installed on the cooling water output pipe. The water inlet end of the cooling water return pipe is connected to the cooling water drain pipe, and the water outlet end is connected to the reflux end of the cooling water storage tank.

[0024] It can be known from the above technical scheme that, compared with the prior art, the present invention discloses a water-cooled spray gun for SNCR denitrification and an SNCR denitrification equipment. By setting a plurality of atomizing nozzles, the reducing agent is sprayed to various parts of the boiler, thereby increasing the contact area with the flue gas, improving the uniformity of mixing with the flue gas, improving the denitrification efficiency, reducing the escape rate of the reducing agent, and reducing the cost. At the same time, the liquid guide pipe and the atomizing nozzle are basically in the inner cavity of the water-cooled shell. The cooling water is introduced into the water-cooled shell by a cooling water inlet pipe, so that the cooling water fully flows around the liquid guide pipe and the atomizing nozzle, thereby enhancing the cooling efficiency of the liquid guide pipe and the atomizing nozzle and extending their service life. By fully mixing and diluting the reducing agent with the dilution water, and then re-metering and distributing it to each water-cooled spray gun, the uniformity of the amount of reducing agent introduced into each spray gun is improved, the uniformity of mixing with the flue gas is enhanced, and the denitrification efficiency is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the structure of a water-cooled spray gun for SNCR denitrification provided by the present invention.

[0027] Figure 2 This is a schematic structural diagram of a SNCR denitrification equipment provided by the present invention.

[0028] Figure 3 This is a schematic structural diagram of the reducing agent distribution assembly and the compressed air supply assembly provided by the present invention.

[0029] Figure 4 This is a schematic structural diagram of the spray gun and cooling water circulation assembly provided by the present invention.

[0030] In the figure: 1, water-cooled spray gun, 11, water-cooled housing, 111, first end, 112, second end, 12, liquid guide tube, 13, reducing agent pipe joint, 14, compressed air pipe joint, 15, atomizing nozzle, 16, cooling water inlet pipe, 17, cooling water drain pipe, 18, atomizing mixer;

[0031] 2. Compressed air supply assembly, 21. Compressed air storage tank, 22. Compressed air delivery pipe, 23. Compressed air delivery pump, 24. Compressed air distribution box, 25. Compressed air distribution pipe, 26. Control valve, 27. Air pressure gauge, 28. Pressure reducing valve;

[0032] 3. Cooling water circulation assembly, 31. Cooling water storage tank, 32. Cooling water output pipe, 33. Cooling water delivery pump, 34. Cooling water return pipe;

[0033] 4. reducing agent concentrated liquid supply assembly, 41. reducing agent concentrated liquid storage tank, 42. reducing agent delivery pipe, 43. reducing agent delivery pump;

[0034] 5. Dilution water supply assembly, 51. Dilution water storage tank, 52. Dilution water delivery pipe, 53. Dilution water delivery pump;

[0035] 6. Metering and mixing components, 61. Reductant flow meter, 62. Reductant regulating valve, 63. Dilution water flow meter, 64. Dilution water regulating valve, 65. Static mixer;

[0036] 7. reducing agent distribution assembly, 71. reducing agent distribution box, 72. reducing agent diluent outlet pipe, 73. reducing agent diluent regulating valve, 74. reducing agent diluent flow meter, 75. hydraulic gauge;

[0037] 8. Boiler. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Embodiment 1:

[0042] See also Figure 1 The embodiment of the present invention discloses a water-cooled spray gun for SNCR denitration, comprising: a water-cooling shell 11, a liquid guide pipe 12, an atomizing nozzle 15 and a cooling water inlet pipe 16;

[0043] The water-cooled shell 11 is made of wear-resistant and corrosion-resistant material, and has a first end 111 and a second end 112 arranged opposite to each other. The first end 111 and the second end 112 are arranged perpendicular to the smoke exhaust direction of the boiler 8 and are fixed to the inner wall of the boiler 8 through a connecting piece, and a cooling water outlet is provided on the side wall close to the first end 111.

[0044] The liquid guide tube 12 is made of wear-resistant and corrosion-resistant materials to reduce corrosion and wear. Its axial direction is parallel to the first end 111 and the second end 112 of the water-cooling shell 11 and is arranged in the inner cavity of the water-cooling shell 11. Its feed end passes through the end wall of the first end 111 of the water-cooling shell 11 and is connected and communicated with the reducing agent pipe joint 13 and the compressed air pipe joint 14. A plurality of liquid outlets are evenly spaced along the axial direction thereof on its side wall, and the liquid outlets can be arranged in a plurality of rows along the circumferential direction of the liquid guide tube 12.

[0045] A plurality of atomizing nozzles 15 are correspondingly installed at a plurality of liquid outlets, and the spray ends thereof penetrate the side wall of the water-cooled shell 11 and extend to the outside of the water-cooled shell 11; by setting a plurality of high temperature resistant and corrosion resistant atomizing nozzles 15, the reducing agent is sprayed to various parts of the boiler 8, thereby increasing the contact area with the flue gas, improving the uniformity of mixing with the flue gas, improving the denitrification efficiency, reducing the reducing agent escape rate, and reducing the cost.

[0046] The cooling water inlet pipe 16 is arranged in the inner cavity of the water-cooled shell 11 along the first end 111 and the second end 112 of the water-cooled shell 11, and its water inlet end penetrates the end wall of the first end 111 of the water-cooled shell 11, and the water outlet end extends to the second end 112 of the water-cooled shell 11 and is connected with the inner cavity of the water-cooled shell 11. The water in the cooling water inlet pipe 16 fills the inner cavity of the water-cooled shell 11 after flowing out, and the cooling water inlet pipe, the liquid guide pipe 12 and the nozzle are completely wrapped in cooling water to prevent contact with the high-temperature air in the boiler 8, thereby extending their service life.

[0047] The cooling water drain pipe 17 is installed at the cooling water outlet and communicated with the inner cavity of the water-cooled shell 11, so as to discharge the cooling water and realize the continuous replacement of the cooling water in the water-cooled shell 11. At the same time, the cooling water is introduced into the water-cooled shell by the cooling water inlet pipe, so that the cooling water flows around the liquid guide tube to enhance the cooling efficiency.

[0048] In a specific example, a filter is installed at the feed end of the liquid guiding tube 12 to prevent the spray gun from being blocked.

[0049] In a specific example, an atomizing mixer 18 is also included. The atomizing mixer 18 is installed near the feed end of the liquid guide tube 12 and is connected to the reducing agent pipe joint 13 and the compressed air pipe joint 14. The atomizing mixer adopts the existing technology and will not be repeated here. It can preliminarily atomize the compressed air and the reducing agent, enhance the atomization effect, enhance the contact area with the flue gas, and enhance the denitrification effect.

[0050] Embodiment 2:

[0051] This embodiment provides a SNCR denitration device, including a reducing agent supply component, a compressed air supply component 2, a cooling water circulation component 3 and a plurality of SNCR denitration water-cooled spray guns 1 in Embodiment 1;

[0052] The reducing agent supply assembly includes a reducing agent concentrate supply assembly 4, a dilution water supply assembly 5, a metering and mixing assembly 6 and a reducing agent distribution assembly 7; the discharge ends of the reducing agent concentrate supply assembly 4 and the dilution water supply assembly 5 are both connected to the feed end of the metering and mixing assembly 6; the feed end of the reducing agent distribution assembly 7 is connected to the discharge end of the metering and mixing assembly 6;

[0053] A plurality of water-cooled spray guns 1 are evenly arranged along the exhaust direction of the boiler 8 and installed in the boiler 8, and a plurality of water-cooled spray guns 1 can also be provided along the vertical exhaust direction of the boiler 8. The reducing agent pipe joint 13 of each water-cooled spray gun 1 is connected to the discharge end of the reducing agent distribution component 7, the compressed air pipe joint 14 is connected to the gas outlet end of the compressed air supply component 2, the discharge end of the cooling water circulation component 3 is connected to the feed end of the cooling water inlet pipe 16, and the reflux end is connected to the discharge end of the cooling water drain pipe 17. By fully mixing and diluting the reducing agent concentrate with the dilution water, and then re-measuring and distributing it to each water-cooled spray gun 1, the uniformity of the reducing agent introduction amount in each spray gun is improved, the uniformity of mixing with the flue gas is strengthened, and the denitrification efficiency is enhanced.

[0054] In a specific example, the reducing agent concentrate supply component 4 includes a reducing agent concentrate storage tank 41, a reducing agent delivery pipe 42 and a reducing agent delivery pump 43. The reducing agent concentrate storage tank 41 is connected to the metering and mixing component 6 through the reducing agent delivery pipe 42. A filter is installed at the inlet of the reducing agent delivery pipe 42. The reducing agent delivery pump 43 is installed on the reducing agent delivery pipe 42. The reducing agent delivery pump 43 adopts a variable frequency centrifugal pump, and the motor inside the pump adopts an explosion-proof motor.

[0055] In a specific example, the dilution water supply component 5 includes a dilution water storage tank 51, a dilution water delivery pipe 52 and a dilution water delivery pump 53. The dilution water storage tank 51 is made of stainless steel and has an insulation layer on the outside. It is connected to the metering and mixing component 6 through the dilution water delivery pipe 52. The dilution water delivery pump 53 is installed on the dilution water delivery pipe 52. The dilution water delivery pump 53 is a multi-stage centrifugal pump with a filter at the inlet to prevent equipment clogging and is equipped with an electric regulating valve; the design flow margin of the pump is not less than 10%, and the pressure head design margin is not less than 20%. During operation, the dilution water flows out of the dilution water storage tank 51 and is delivered to the metering and mixing component 6 through the delivery pump.

[0056] In a specific example, the metering and mixing component 6 is mainly used to quantitatively control the reducing agent and dilution water required for the denitration process and then mix them and send them to the reducing agent distribution component 7. The reducing agent concentration after mixing and dilution is not more than 10%. It includes a reducing agent flow meter 61, a reducing agent regulating valve 62, a dilution water flow meter 63, a dilution water regulating valve 64 and a static mixer 65. The reducing agent flow meter 61 and the reducing agent regulating valve 62 are both installed on the reducing agent delivery pipe 42, and the dilution water flow meter 63 and the dilution water regulating valve 64 are both installed on the dilution water delivery pipe 52. The discharge ends of the reducing agent delivery pipe 42 and the dilution water delivery pipe 52 are both connected to the feed end of the static mixer 65, and the discharge end of the static mixer 65 is connected to the feed end of the reducing agent distribution component 7. Among them, the reducing agent flow meter 61 adopts an electromagnetic flow meter, and the dilution water flow meter 63 adopts a metal tube float flow meter. Each boiler 8 can be equipped with a set of metering and mixing components. During operation, the reducing agent flow meter 61 and the dilution water flow meter 63 are used according to the NO in the flue gas. x The real-time numerical emission adjusts the amount of reducing agent and dilution water to achieve the best denitrification effect and efficiency.

[0057] In a specific example, the reducing agent distribution assembly 7 includes a reducing agent distribution box 71, a plurality of reducing agent diluent outlet pipes 72, a reducing agent diluent regulating valve 73, a reducing agent diluent flow meter 74 and a hydraulic gauge 75. The reducing agent distribution box 71 is fixed to the outer wall of the boiler 8, and a plurality of reducing agent diluent outlet pipes 72 are installed in parallel in the reducing agent distribution box 71, and the feed ends thereof are all connected to the discharge ends of the static mixer 65, and the discharge ends pass through the side wall of the reducing agent distribution box 71 to connect to the reducing agent pipe joint 13 of the corresponding water-cooled spray gun 1; each reducing agent diluent outlet pipe 72 is provided with a reducing agent diluent regulating valve 73, a reducing agent diluent flow meter 74 and a hydraulic gauge 75. The reducing agent distribution assembly 7 adopts a modular design, and each component is integrated in the reducing agent distribution box 71 to redistribute the diluted reducing agent evenly to each spray gun.

[0058] In a specific example, the compressed air supply assembly 2 includes a compressed air storage tank 21, a compressed air delivery pump 23, a compressed air delivery pipe 22, a compressed air distribution box 24 and multiple compressed air distribution pipes 25. The air inlet end of the compressed air delivery pump 23 is connected to the compressed air storage tank 21, one end of the compressed air delivery pipe 22 is connected to the compressed air delivery pump 23, and the other end extends into the compressed air distribution box 24. Multiple compressed air distribution pipes 25 are installed in parallel in the compressed air distribution box 24, and the air inlet end of each compressed air distribution pipe 25 is connected to the air outlet end of the compressed air delivery pump 23, and the air outlet end passes through the side wall of the compressed air distribution box 24 to be connected to the compressed air pipe joint 14 of the corresponding water-cooled spray gun 1, thereby introducing compressed air into the corresponding spray gun.

[0059] In a specific example, a control valve 26, an air pressure gauge 27 and a pressure reducing valve 28 are installed on each compressed air distribution pipe 24. The pressure of the compressed air needs to be stabilized at 0.4-0.5 MPa during operation to improve the atomization effect of the reducing agent. When the compressed air pressure is high, the pressure reducing valve 28 can be used to adjust the air pressure.

[0060] In a specific example, a check valve is installed on each compressed air distribution pipe 24 and each reducing agent diluent outlet pipe 72 to prevent the reducing agent in the spray gun from flowing back.

[0061] In a specific example, the reducing agent distribution box 71 and the compressed air distribution box 24 are installed in the same module box, which protects the internal equipment and also prevents wind and heat from freezing the equipment or pipes. The module box is fixed to the outer wall of the boiler 8 near the spray gun by welding or bolting to avoid affecting the normal operation and maintenance of the boiler 8.

[0062] In a specific example, the cooling water circulation component 3 includes a cooling water storage tank 31, a cooling water output pipe 32, a cooling water delivery pump 33 and a cooling water return pipe 34. The cooling water storage tank 31 is connected to the water inlet end of the cooling water inlet pipe 16 through the cooling water output pipe 32. The cooling water delivery pump 33 is installed on the cooling water output pipe 32. The water inlet end of the cooling water return pipe 34 is connected to the cooling water drain pipe 17, and the water outlet end is connected to the return end of the cooling water storage tank 31. The cooling water is recycled to avoid waste. In some embodiments, there is no need to set up a cooling water storage tank independently, and the water in the dilution water storage tank is directly used.

[0063] In some specific examples, each pump, valve and flow meter can be set up in two groups in parallel, one of which works during operation, and when it needs to be closed for inspection and maintenance, the other group is turned on to ensure that the equipment does not stop and avoid affecting work efficiency.

[0064] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0065] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A water-cooled spray gun for SNCR denitration, characterized in that: include: A water-cooled shell (11), the water-cooled shell (11) having a first end (111) and a second end (112) arranged opposite to each other, the first end (111) and the second end (112) being arranged perpendicular to the smoke exhaust direction of the boiler (8) and fixed to the inner wall of the boiler (8), and a cooling water outlet being provided on a side wall arranged near the first end (111); a liquid guide tube (12), the liquid guide tube (12) being arranged in the inner cavity of the water-cooling shell (11) in an axial direction parallel to the first end (111) and the second end (112) of the water-cooling shell (11), the feed end of the liquid guide tube (12) passing through the end wall of the first end (111) of the water-cooling shell (11) and being fixed to and connected with the reducing agent pipe joint (13) and the compressed air pipe joint (14), and a plurality of liquid outlets being evenly spaced on the side wall thereof along the axial direction thereof; Atomizing nozzles (15), wherein a plurality of atomizing nozzles (15) are mounted correspondingly at the plurality of liquid outlets, and the spray ends thereof penetrate the side wall of the water-cooling housing (11) and extend to the outside of the water-cooling housing (11); a cooling water inlet pipe (16), the cooling water inlet pipe (16) being arranged in the inner cavity of the water-cooling shell (11) along the first end (111) and the second end (112) of the water-cooling shell (11), the water inlet end of the cooling water inlet pipe (16) penetrating the end wall of the first end (111) of the water-cooling shell (11), and the water outlet end extending toward the second end (112) of the water-cooling shell (11) and communicating with the inner cavity of the water-cooling shell (11); A cooling water drainage pipe (17), wherein the cooling water drainage pipe (17) is installed at the cooling water outlet and is in communication with the inner cavity of the water-cooling housing (11).

2. The SNCR denitration water-cooled spray gun according to claim 1, characterized in that: A filter is installed at the feed end of the liquid guiding tube (12).

3. The SNCR denitrification water-cooled spray gun according to claim 1, characterized in that: It also includes an atomizing mixer (18), the discharge end of the atomizing mixer (18) being connected to the feed end of the liquid guide tube (12), and the feed end of the atomizing mixer (18) being connected to both the reducing agent pipe joint (13) and the compressed air pipe joint (14).

4. A SNCR denitration device, characterized in that: It comprises a reducing agent supply component, a compressed air supply component (2), a cooling water circulation component (3) and a plurality of SNCR denitrification water-cooled spray guns (1) as claimed in any one of claims 1 to 3; The reducing agent supply assembly comprises a reducing agent concentrate supply assembly (4), a dilution water supply assembly (5), a metering and mixing assembly (6) and a reducing agent distribution assembly (7); the discharge ends of the reducing agent concentrate supply assembly (4) and the dilution water supply assembly (5) are both connected to the feed end of the metering and mixing assembly (6); the feed end of the reducing agent distribution assembly (7) is connected to the discharge end of the metering and mixing assembly (6); A plurality of the water-cooled spray guns (1) are evenly arranged along the smoke exhaust direction of the boiler (8) and installed in the boiler (8); the reducing agent pipe joint (13) of each of the water-cooled spray guns (1) is connected to the discharge end of the reducing agent distribution component (7); the compressed air pipe joint (14) is connected to the air outlet end of the compressed air supply component (2); the discharge end of the cooling water circulation component (3) is connected to the feed end of the cooling water inlet pipe (16); and the return end is connected to the discharge end of the cooling water drain pipe (17).

5. The SNCR denitration equipment according to claim 4, characterized in that: The reducing agent concentrated liquid supply component (4) comprises a reducing agent concentrated liquid storage tank (41), a reducing agent delivery pipe (42) and a reducing agent delivery pump (43); the reducing agent concentrated liquid storage tank (41) is connected to the metering and mixing component (6) via the reducing agent delivery pipe (42); and the reducing agent delivery pump (43) is mounted on the reducing agent delivery pipe (42).

6. The SNCR denitration equipment according to claim 5, characterized in that: The dilution water supply assembly (5) comprises a dilution water storage tank (51), a dilution water delivery pipe (52) and a dilution water delivery pump (53); the dilution water storage tank (51) is connected to the metering and mixing assembly (6) via the dilution water delivery pipe (52); and the dilution water delivery pump (53) is installed on the dilution water delivery pipe (52).

7. The SNCR denitration equipment according to claim 6, characterized in that: The metering and mixing assembly (6) comprises a reducing agent flow meter (61), a reducing agent regulating valve (62), a dilution water flow meter (63), a dilution water regulating valve (64) and a static mixer (65); the reducing agent flow meter (61) and the reducing agent regulating valve (62) are both installed on the reducing agent delivery pipe (42); the dilution water flow meter (63) and the dilution water regulating valve (64) are both installed on the dilution water delivery pipe (52); the discharge ends of the reducing agent delivery pipe (42) and the dilution water delivery pipe (52) are both connected to the feed end of the static mixer (65); and the discharge end of the static mixer (65) is connected to the feed end of the reducing agent distribution assembly (7).

8. The SNCR denitration equipment according to claim 7, characterized in that: The reducing agent distribution assembly (7) comprises a reducing agent distribution box (71), a plurality of reducing agent diluent outlet pipes (72), a reducing agent diluent regulating valve (73), a reducing agent diluent flow meter (74) and a hydraulic gauge (75). The reducing agent distribution box (71) is fixed to the outer wall of the boiler (8). The plurality of reducing agent diluent outlet pipes (72) are installed in parallel in the reducing agent distribution box (71), and the feed ends thereof are all connected to the discharge ends of the static mixer (65). The discharge ends pass through the side wall of the reducing agent distribution box (71) and are connected to the reducing agent pipe joint (13) corresponding to the water-cooled spray gun (1). Each reducing agent diluent outlet pipe (72) is provided with a reducing agent diluent regulating valve (73), a reducing agent diluent flow meter (74) and a hydraulic gauge (75).

9. The SNCR denitration equipment according to claim 8, characterized in that: The compressed air supply assembly (2) comprises a compressed air storage tank (21), a compressed air delivery pump (23), a compressed air delivery pipe (22), a compressed air distribution box (24) and a plurality of compressed air distribution pipes (25); an air inlet end of the compressed air delivery pump (23) is connected to the compressed air storage tank (21); one end of the compressed air delivery pipe (22) is connected to the compressed air delivery pump (23) and the other end extends into the compressed air distribution box (24); a plurality of compressed air distribution pipes (25) are installed in parallel in the compressed air distribution box (24); an air inlet end of each compressed air distribution pipe (25) is connected to an air outlet end of the compressed air delivery pump (23); and an air outlet end passes through a side wall of the compressed air distribution box (24) and is connected to a compressed air pipe joint (14) corresponding to the water-cooled spray gun (1).

10. The SNCR denitration equipment according to claim 9, characterized in that: The cooling water circulation assembly (3) comprises a cooling water storage tank (31), a cooling water output pipe (32), a cooling water delivery pump (33) and a cooling water return pipe (34); the cooling water storage tank (31) is connected to the water inlet end of the cooling water inlet pipe (16) via the cooling water output pipe (32); the cooling water delivery pump (33) is installed on the cooling water output pipe (32); the water inlet end of the cooling water return pipe (34) is connected to the cooling water drain pipe (17); and the water outlet end is connected to the return end of the cooling water storage tank (31).

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