Powder spraying gun and powder spraying device

Abstract

The utility model discloses a powder spray gun and a powder spraying device, and belongs to the technical field of environmental protection equipment. The powder spray gun comprises a first pipe shell, a first feeding pipe, a second pipe shell and a second feeding pipe. The first pipe shell and the second pipe shell are detachably connected, and the first feeding pipe and the second feeding pipe are connected in an inserted mode, so that when an installation worker installs or overhaul the powder spray gun, the appropriate second feeding pipe and the appropriate second pipe shell can be selected and replaced to be connected to the first pipe shell and the first feeding pipe according to the current actual working condition, and the installation work efficiency is improved. The first pipe shell, the first feeding pipe and other equipment connected with the first pipe shell and the first feeding pipe do not need to be replaced; thus, the applicability of the powder spray gun can be improved, the powder spray gun is simple in overall structure and convenient to machine and manufacture, and meanwhile the difficulty of transportation, installation and overhaul can be reduced through the sectional structure.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection equipment, in particular to a powder spray gun and a powder spray device. Background Art

[0002] With the development of industry and the improvement of people's living standards, the demand for environmental quality is constantly increasing. Sulfur dioxide (SO2) in coal-fired flue gas has become a major cause of air pollution. Reducing SO2 pollution is a top priority in today's atmospheric environmental governance. Many flue gas desulfurization processes are already widely used in industry, and they also have important practical significance for the treatment of exhaust gases from various boilers and incinerators.

[0003] Flue-jet desulfurization (FJD) involves injecting desulfurizer particles into the flue gas via a spray gun. This method removes acidic gases such as SO2, SO3, and HCl. The core equipment for FJD is the powder spray gun.

[0004] However, current powder spray guns have low applicability for different usage scenarios. Utility Model Content

[0005] The present invention provides a powder spray gun and a powder spray device. The technical solution is as follows:

[0006] According to one aspect of the present invention, a powder spray gun is provided, comprising: a first tube shell, a first feeding pipe, a second tube shell and a second feeding pipe;

[0007] The first tube shell has an air inlet, one end of the first tube shell is detachably connected to one end of the second tube shell, and the end of the second tube shell facing away from the first tube shell has an air outlet;

[0008] The first tube shell is sleeved outside the first feeding pipe, and a first gas flow channel communicating with the gas inlet is formed between the outer wall of the first feeding pipe and the inner wall of the first tube shell;

[0009] The second tube shell is sleeved outside the second feeding tube, and a gap is formed between the outer wall of the second feeding tube and the inner wall of the second tube shell.

[0010] a second gas flow channel connected to the gas outlet;

[0011] Wherein, one end of the first feeding pipe close to the second feeding pipe is located outside the first tube shell and extends into the second feeding pipe, or one end of the second feeding pipe close to the first feeding pipe is located outside the second tube shell and extends into the first feeding pipe.

[0012] Optionally, one of the first feeding pipe and the second feeding pipe is a first target feeding pipe, the other of the first feeding pipe and the second feeding pipe is a second target feeding pipe, and part of the first target feeding pipe extends into the second target feeding pipe;

[0013] The outer wall of a portion of the tube body of the first target feeding tube is gap-fitted with the inner wall of the second target feeding tube.

[0014] Optionally, the first target feeding pipe comprises a first pipe body and a second pipe body connected to each other, the first pipe body is at least partially located inside the second target feeding pipe, and the second pipe body is located outside the second target feeding pipe;

[0015] The outer diameter of the first tube body is smaller than or equal to the inner diameter of the second target feeding tube, and the outer diameter of the second tube body is larger than the inner diameter of the second target feeding tube.

[0016] Optionally, the first target feeding pipe is the first feeding pipe;

[0017] The inner diameter of at least a portion of the first tube body gradually decreases along a first direction, and the first direction is a direction from the first tube shell to the second tube shell.

[0018] Optionally, the first pipe body includes a first sub-pipe and a second sub-pipe connected to each other;

[0019] The first sub-tube is located on a side of the second sub-tube away from the second tube body, and both the inner diameter and the outer diameter of the first sub-tube gradually decrease in the first direction.

[0020] Optionally, the powder spray gun further comprises a first connecting member, a second connecting member and a locking member, wherein the locking member is detachably connected to at least one of the first connecting member and the second connecting member;

[0021] The first connecting member is fixedly connected to one end of the first tube shell close to the second tube shell, and the second connecting member is fixedly connected to one end of the second tube shell close to the first tube shell.

[0022] Optionally, the first connecting member and the second connecting member both have connecting holes, and the locking member passes through the connecting holes to be detachably connected to the flue.

[0023] Optionally, the powder spray gun further includes a plurality of first reinforcing ribs and a plurality of second reinforcing ribs, wherein the plurality of first reinforcing ribs are distributed around the first feeding pipe, and the first reinforcing ribs are respectively fixedly connected to the first tube shell and the first feeding pipe, and the plurality of second reinforcing ribs are distributed around the second feeding pipe, and are respectively fixedly connected to the second tube shell and the second feeding pipe;

[0024] The multiple first reinforcing ribs are all located at one end of the first tube shell close to the second tube shell, and the multiple second reinforcing ribs are all located at one end of the second tube shell close to the first tube shell. The multiple first reinforcing ribs correspond to the multiple second reinforcing ribs one by one, and the first reinforcing ribs and the corresponding second reinforcing ribs at least partially overlap in the axial direction of the first tube shell.

[0025] Optionally, the powder spray gun further comprises a plurality of swirl blades, wherein the plurality of swirl blades are located in the second gas flow channel and are arranged adjacent to the gas outlet, the plurality of swirl blades are distributed around the second feeding pipe, and one end of the swirl blade is fixedly connected to the outer wall of the second feeding pipe, and the other end is fixedly connected to the inner wall of the second tube shell.

[0026] According to another aspect of the present invention, a powder injection device is provided, which includes a mounting frame, an auxiliary air blower and a powder spray gun. The auxiliary air blower and the powder spray gun are both assembled in the mounting frame, and the air outlet of the auxiliary air blower is connected to the air inlet of the powder spray gun. The powder spray gun is the above-mentioned powder spray gun.

[0027] The beneficial effects of the technical solution provided by the embodiment of the utility model include at least:

[0028] A powder spray gun is provided, comprising a first tube shell, a first feeding pipe, a second tube shell and a second feeding pipe. The first tube shell and the second tube shell are detachably connected, and the first feeding pipe and the second feeding pipe are plugged in, so that when installing or repairing the powder spray gun, the installer can choose to replace the appropriate second feeding pipe and the second tube shell to connect to the first tube shell and the first feeding pipe according to the current actual working conditions, without having to replace the first tube shell, the first feeding pipe and other equipment connected to the first tube shell and the first feeding pipe; in this way, the applicability of the powder spray gun can be improved, and the overall structure of the powder spray gun is simple and easy to process and manufacture. At the same time, the segmented structure can reduce the difficulty of transportation, installation and maintenance.

[0029] Moreover, by plugging the first feeding pipe and the second feeding pipe, the first feeding pipe and the second feeding pipe can be fused into one in the plugging area, ensuring the connection stability of the first feeding pipe and the second feeding pipe, and avoiding the first feeding pipe and the second feeding pipe from being detached or misplaced when the powder spray gun is subjected to external impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 This is a schematic structural diagram of a powder spray gun provided by an embodiment of the present utility model;

[0032] Figure 2 yes Figure 1 A schematic structural diagram of another powder spray gun is shown;

[0033] Figure 3 It is a schematic diagram of the connection structure between a powder spray gun and a flue;

[0034] Figure 4 This is another schematic diagram of the connection structure between the powder spray gun and the flue;

[0035] Figure 5 This is another schematic diagram of the connection structure between the powder spray gun and the flue;

[0036] Figure 6 This is a partial cross-sectional view of a powder nozzle provided by an embodiment of the present utility model;

[0037] Figure 7 A schematic diagram of the explosion structure of a powder nozzle provided in an embodiment of the utility model;

[0038] Figure 8 This is a partial cross-sectional view of another powder nozzle provided by an embodiment of the present utility model;

[0039] Figure 9 This is a partial cross-sectional view of another powder nozzle provided by an embodiment of the present utility model;

[0040] Figure 10 yes Figure 6 The cross-sectional structure diagram of the powder spray gun along the A1-A2 position is shown;

[0041] Figure 11 This is a schematic diagram of the connection structure of a swirl blade provided in an embodiment of the present utility model;

[0042] Figure 12 yes Figure 11 A structural schematic diagram of the connection structure of the swirl blades shown in another perspective;

[0043] Figure 13 It is a structural schematic diagram of a powder injection device provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0045] The powder spray gun is usually installed on one side of the flue, and the powder spray gun can also be connected to the feeding equipment and the air guide equipment. The feeding equipment can deliver the desulfurizer to the powder spray gun, and the air guide equipment can deliver a high-speed airflow into the powder spray gun, so that the powder is sprayed into the flue with the assistance of the gas delivered by the air guide equipment. Due to the different flue structures and different flue gas flow rates, the length of the powder spray gun and the direction of the air outlet of the powder spray gun have different requirements, resulting in low applicability of the powder spray gun and cannot meet actual working conditions.

[0046] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic structural diagram of a powder spray gun 10 provided in an embodiment of the present utility model. Figure 2 yes Figure 1 The schematic diagram of another powder spray gun 10 is shown. The powder spray gun 10 may include: a first tube shell 11, a first feeding pipe 12, a second tube shell 13 and a second feeding pipe 14. It should be noted that, Figure 1 and Figure 2 2 and 3 show partial cross-sectional views of the connection position of the first feeding pipe 12 and the second feeding pipe 14.

[0047] The first tube shell 11 may have an air inlet k1 , one end of the first tube shell 11 may be detachably connected to one end of the second tube shell 13 , and the end of the second tube shell 13 facing away from the first tube shell 11 may have an air outlet k2 , which may be connected to the air inlet k1 .

[0048] The first tube shell 11 can be mounted outside the first feeding tube 12, and a first gas flow channel d1 communicating with the gas inlet k1 can be formed between the outer wall of the first feeding tube 12 and the inner wall of the first tube shell 11. The second tube shell 13 can be mounted outside the second feeding tube 14, and a second gas flow channel d2 communicating with the gas outlet k2 can be formed between the outer wall of the second feeding tube 14 and the inner wall of the second tube shell. The first feeding tube 12 and the first tube shell 11 can be connected, and further, the first feeding tube 12 and the first tube shell 11 can be fixedly connected; the second feeding tube 14 and the second tube shell 13 can be connected, and further, the second feeding tube 14 and the second tube shell 13 can be fixedly connected.

[0049] Among them, the end of the first feeding tube 12 close to the second feeding tube 14 can be located outside the first tube shell 11 and extend into the second feeding tube 14, or the end of the second feeding tube 14 close to the first feeding tube 12 can be located outside the second tube shell 13 and extend into the first feeding tube 12, the end of the first feeding tube 12 away from the second feeding tube 14 has a feed port b1, and the feed port b1 can be exposed from the end of the first tube shell 11 away from the second tube shell 13, the end of the second feeding tube 14 away from the first feeding tube 12 has a discharge port b2, the discharge port b2 can be located at the air outlet k2 of the second tube shell 13, and can be connected to the air outlet k2.

[0050] In this way, by plugging the first feeding pipe 12 and the second feeding pipe 14, the feed port b1 of the first feeding pipe 12 and the discharge port b2 of the second feeding pipe 14 can be connected. At the same time, the first gas flow channel d1 and the second gas flow channel d2 can also be connected, so that the air inlet k1 and the air outlet k2 are connected through the first gas flow channel d1 and the second gas flow channel d2.

[0051] Exemplarily, when one end of the first feeding tube 12 close to the second feeding tube 14 can be located outside the first tube shell 11 and extend into the second feeding tube 14, part of the first feeding tube 12 can be located inside the first tube shell 11, and the other part of the first feeding tube 12 close to the second feeding tube 14 can be located outside the first tube shell 11, and the extension direction of the first feeding tube 12 can be parallel to the extension direction of the first tube shell 11; the second feeding tube 14 can be located in the second tube shell 13, and the extension direction of the second feeding tube 14 can be parallel to the extension direction of the second tube shell 13.

[0052] The powder spray gun 10 can be installed on the flue, so that the desulfurizer sprayed from the powder spray gun 10 can be mixed with the flue gas in the flue and produce a chemical reaction. The first tube shell 11 and the second tube shell 13 are detachably connected, and the first feeding pipe 12 and the second feeding pipe 14 are plugged in, so that when installing or repairing the powder spray gun 10, the installer can choose to replace the appropriate second feeding pipe 14 and the second tube shell 13 according to the current actual working conditions to connect to the first tube shell 11 and the first feeding pipe 12, without having to replace the first tube shell 11, the first feeding pipe 12 and other equipment connected to the first tube shell 11 and the first feeding pipe 12. For example, the first feeding pipe 12 can be fixedly connected to the discharge port b2 of the feeding equipment, and the first tube shell 11 can be fixedly connected to the air outlet of the air guide equipment. In this way, the applicability of the powder spray gun 10 can be improved, and the overall structure of the powder spray gun 10 is simple and easy to process and manufacture. At the same time, the segmented structure can reduce the difficulty of transportation, installation and maintenance.

[0053] Moreover, by plugging the first feeding pipe 12 and the second feeding pipe 14 together, the first feeding pipe 12 and the second feeding pipe 14 can be integrated into one in the plugging area, thereby ensuring the connection stability of the first feeding pipe 12 and the second feeding pipe 14, and preventing the first feeding pipe 12 and the second feeding pipe 14 from being disengaged or misplaced when the powder spray gun 10 is subjected to external impact.

[0054] In summary, a powder spray gun is provided, comprising a first tube shell, a first feeding pipe, a second tube shell and a second feeding pipe. The first tube shell and the second tube shell are detachably connected, and the first feeding pipe and the second feeding pipe are plugged in, so that when installing or repairing the powder spray gun, the installer can choose to replace the appropriate second feeding pipe and the second tube shell to connect to the first tube shell and the first feeding pipe according to the current actual working conditions, without replacing the first tube shell, the first feeding pipe and other equipment connected to the first tube shell and the first feeding pipe; in this way, the applicability of the powder spray gun can be improved, and the overall structure of the powder spray gun is simple and easy to process and manufacture. At the same time, the segmented structure can reduce the difficulty of transportation, installation and maintenance.

[0055] Moreover, by plugging the first feeding pipe and the second feeding pipe, the first feeding pipe and the second feeding pipe can be fused into one in the plugging area, ensuring the connection stability of the first feeding pipe and the second feeding pipe, and avoiding the first feeding pipe and the second feeding pipe from being detached or misplaced when the powder spray gun is subjected to external impact.

[0056] Please refer to Figure 3 、 Figure 4 and Figure 5 , Figure 3 This is a schematic diagram of the connection structure between the powder spray gun 10 and the flue. Figure 4 This is another schematic diagram of the connection structure between the powder spray gun 10 and the flue. Figure 5 This is another schematic diagram of the connection structure between the powder spray gun 10 and the flue. In an exemplary embodiment, when installing the powder spray gun 10 on the side of the flue, the installer needs to determine the length of the powder spray gun 10 extending into the flue, as well as the angle between the direction of the powder spray gun 10's air outlet and the flow direction of the flue gas based on the flue structure and the mixing characteristics of the desulfurizer and the flue gas in the flue. In this embodiment of the utility model, the air outlet of the powder spray gun 10 can be the air outlet k2 of the second tube shell 13.

[0057] exist Figure 3 and Figure 4In the embodiment, since the wall thickness of the flue A1 is greater than that of the flue A2, if the powder spray gun 10 is to be extended into the same position in the flue A1 and the flue A2, the length of the powder spray gun 10 extended into the flue A1 needs to be greater than the length of the powder spray gun 10 extended into the flue A2 to offset the difference in wall thickness between the flue A1 and the flue A2. That is, the length of the second tube shell 13 and the second feeding pipe 14 in the powder spray gun 10 connected to the flue A1 can be greater than the length of the second tube shell 13 and the second feeding pipe 14 in the powder spray gun 10 connected to the flue A1. In addition, the installer determines that the angle between the direction of the air outlet k2 of the powder spray gun 10 and the flow direction of the flue gas in the flue is 90 degrees based on the mixing characteristics of the flue gas and the desulfurizer in the flue A1 and the flue A2. Then the second tube shell 13 and the second feeding pipe 14 can both be straight cylindrical, that is, the extension direction of the second feeding pipe 14 can be the same as the extension direction of the first feeding pipe 12.

[0058] exist Figure 5 In the process, the installer determines that the angle between the direction of the air outlet k2 of the powder spray gun 10 and the flow direction of the flue gas in the flue A3 is 0 degrees based on the mixing characteristics of the flue gas and the desulfurizer in the flue A3, that is, the direction of the air outlet k2 of the powder spray gun 10 is the same as the flow direction of the flue gas in the flue A3, then the second tube shell 13 and the second feeding pipe 14 are in the shape of a curved tube, that is, the extension direction of the part of the second feeding pipe 14 away from the first feeding pipe 12 can be different from the extension direction of the first feeding pipe 12.

[0059] In an exemplary embodiment, during the process of manufacturing the powder spray gun 10, a plurality of second tube shells 13 and second feeding pipes 14 of different shapes can be manufactured respectively, and a first tube shell 11 and a first feeding pipe 12 of the same shape can be manufactured. The installer can connect the different second tube shells 13 and second feeding pipes 14 to the first tube shell 11 and the first feeding pipe 12 according to the structure of the flue and the mixing characteristics of the flue gas and the desulfurizer in the flue.

[0060] Please refer to Figure 1 and Figure 2In an optional embodiment, one of the first feeding tube 12 and the second feeding tube 14 is a first target feeding tube, and the other of the first feeding tube 12 and the second feeding tube 14 is a second target feeding tube, and a portion of the tube body of the first target feeding tube extends into the second target feeding tube; the outer wall of the portion of the tube body of the first target feeding tube can be gap-fitted with the inner wall of the second target feeding tube. Exemplarily, the gap between the outer wall of the portion of the tube body of the first target feeding tube and the inner wall of the second target feeding tube is greater than or equal to 0 mm and less than or equal to 10 mm. For example, the gap between the outer wall of the portion of the tube body of the first target feeding tube and the inner wall of the second target feeding tube is equal to 0 mm. In this case, the outer wall of the portion of the tube body of the first target feeding tube can contact the inner wall of the second target feeding tube. Further, the outer wall of the portion of the tube body of the first target feeding tube can fit with the inner wall of the second target feeding tube.

[0061] like Figure 1 As shown, when the first feeding tube 12 is the first target feeding tube and the second feeding tube 14 is the second target feeding tube, part of the tube body of the first feeding tube 12 can be extended into the second feeding tube 14; the outer wall of the part of the tube body of the first feeding tube 12 can be loosely matched with the inner wall of the second feeding tube 14, so that the connection tightness between the first feeding tube 12 and the second feeding tube 14 can be improved to avoid powder leakage from the connection between the first feeding tube 12 and the second feeding tube 14.

[0062] like Figure 2 As shown, when the second feeding tube 14 is the first target feeding tube and the first feeding tube 12 is the second target feeding tube, part of the tube body of the second feeding tube 14 can be extended into the first feeding tube 12; the outer wall of the part of the tube body of the second feeding tube 14 can be loosely matched with the inner wall of the first feeding tube 12, so that the connection tightness between the first feeding tube 12 and the second feeding tube 14 can be improved to avoid powder leakage from the connection between the first feeding tube 12 and the second feeding tube 14.

[0063] Please refer to Figure 6 and Figure 7 , Figure 6 This is a partial cross-sectional view of a powder nozzle provided by an embodiment of the utility model. Figure 7The present invention provides a schematic diagram of the explosion structure of a powder nozzle. In an optional embodiment, the first target feeding pipe includes a first tube body 121 and a second tube body 122 connected to each other. The first tube body 121 is at least partially located inside the second target feeding pipe, and the second tube body 122 is located outside the second target feeding pipe. The outer diameter of the first tube body 121 is less than or equal to the inner diameter of the second target feeding pipe, and the outer diameter of the second tube body 122 is greater than the inner diameter of the second target feeding pipe. The present invention embodiment takes the first feeding pipe 12 as the first target feeding pipe as an example for explanation. The first feeding pipe 12 can include a first tube body 121 and a second tube body 122. The outer diameter of the first tube body 121 is less than or equal to the inner diameter of the second feeding pipe 14, and the outer diameter of the second tube body 122 is greater than the inner diameter of the second feeding pipe 14. That is, the outer surface of the first feeding tube 12 is provided with a limiting step, and the limiting step includes a first surface and a second surface connected thereto, wherein the first surface can be the outer wall of the first tube body 121, and the second surface can be the portion of the end surface of the second tube body 122 near one end of the first tube body 121. By providing the limiting step on the outer side of the first feeding tube 12, the length of the first feeding tube 12 inserted into the second feeding tube 14 can be controlled, and the concentricity of the first feeding tube 12 and the second feeding tube 14 can be ensured, that is, the axis of the first feeding tube 12 and the axis of the second feeding tube 14 can be ensured to be parallel to or coincide with each other.

[0064] Please refer to Figure 8 , Figure 8 This is a partial cross-sectional view of another powder nozzle provided by an embodiment of the present invention. In an optional embodiment, the first target feeding pipe may be the first feeding pipe 12. The inner diameter of at least a portion of the first tube body 121 gradually decreases along a first direction D1, where the first direction D1 is the direction from the first tube shell 11 toward the second tube shell 13. The first direction D1 may be parallel to the axis of the first feeding pipe 12.

[0065] In this way, the powder located in the first tube body 121 can produce a Venturi effect during the flow process. This effect is manifested as an increase in the flow velocity of the fluid when the restricted flow passes through a reduced flow cross-section. That is, when flowing inside the first tube body 121, the dynamic pressure reaches a maximum value and the static pressure reaches a minimum value at the narrowest point of the first tube body 121. The speed of the powder increases due to the reduction in the cross-sectional area of ​​the flow, thereby increasing the speed of the powder flowing from the first feeding pipe 12 to the second feeding pipe 14, and improving the diffusion effect of the powder after being ejected from the discharge port b2.

[0066] Please refer to Figure 9 , Figure 9This is a partial cross-sectional view of another powder spray nozzle provided by an embodiment of the present invention. In an optional embodiment, the first tube body 121 may include a first sub-tube 1211 and a second sub-tube 1212. The first sub-tube 1211 is located on the side of the second sub-tube 1212 facing away from the second tube body 122, and the inner diameter and outer diameter of the first sub-tube 1211 gradually decrease in the first direction D1. The second sub-tube 1212 can be fixedly connected to the second tube body 122. In this way, when connecting the first feeding tube 12 and the second feeding tube 14, the difficulty of inserting the first feeding tube 12 into the second feeding tube 14 can be reduced due to the smaller outer diameter of the side of the first sub-tube 1211 closer to the second feeding tube 14. In addition, the outer wall of the second sub-tube 1212 can be parallel to the inner wall of the second feeding tube 14, and the inner wall of the second sub-tube 1212 can be parallel to and connected to the inner wall of the first tube body 121. In this way, the connection between the first feeding tube 12 and the second feeding tube 14 can be improved.

[0067] In an exemplary embodiment, the angle between the busbar of the inner wall of the first sub-tube 1211 and the axis of the first sub-tube 1211 ranges from 5 degrees to 30 degrees. Exemplarily, the angle between the busbar of the inner wall of the first sub-tube 1211 and the axis of the first sub-tube 1211 is 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, or 30 degrees.

[0068] Please refer to Figure 9 In an optional embodiment, the powder spray gun 10 may further include a first connecting member 15, a second connecting member 16 and a locking member 17, and the locking member 17 can be detachably connected to at least one of the first connecting member 15 and the second connecting member 16; the first connecting member 15 can be fixedly connected to an end of the first tube shell 11 close to the second tube shell 13, and the second connecting member 16 can be fixedly connected to an end of the second tube shell 13 close to the first tube shell 11.

[0069] The locking member 17 can be fixedly connected to the first connecting member 15 and detachably connected to the second connecting member 16, or the locking member 17 can be fixedly connected to the second connecting member 16 and detachably connected to the first connecting member 15, or the locking member 17 can be detachably connected to both the first connecting member 15 and the second connecting member 16.

[0070] The first connecting member 15 can be welded to the first tube shell 11, and the second connecting member 16 can be welded to the second tube shell 13. The first connecting member 15 and the second connecting member 16 both have connecting holes. The locking member 17 can pass through the connecting hole on the first connecting member 15 and the connecting hole on the second connecting member 16 to connect the first connecting member 15 and the second connecting member 16, thereby detachably connecting the first tube shell 11 and the second tube shell 13.

[0071] In an exemplary embodiment, the first connecting member 15 and the second connecting member 16 may both be connecting flanges, the locking member 17 may be a connecting bolt, the multiple connecting holes on the first connecting member 15 may correspond one to one with the multiple connecting holes on the second connecting member 16, and the connecting bolts are positioned in the connecting holes to securely connect the first connecting member 15 and the second connecting member 16. The powder spray gun 10 may further include a connecting gasket positioned between the first connecting member 15 and the second connecting member 16, which may be a flange gasket.

[0072] In an alternative embodiment, the first connector 15 and the second connector 16 may both have connection holes, through which the locking member 17 can be passed to detachably connect to the flue. In this case, the first connector 15 and the second connector 16 are provided on the outer surface of the powder spray gun 10. While the first connector 15 and the second connector 16 connect the first tube shell 11 and the second tube shell 13, the first connector 15 and the second connector 16 can be reused as connectors for detachable connection to the flue, thereby achieving connection between the powder spray gun 10 and the flue.

[0073] Moreover, when the second tube shell 13 and the second feeding pipe 14 need to be replaced, or the powder spray gun 10 needs to be repaired, the first connecting member 15 and the second connecting member 16 can be directly disassembled and separated from the flue, and the powder spray gun 10 can be pulled out of the flue to replace parts or perform inspection and maintenance, which makes the installation and disassembly steps of the powder spray gun 10 more convenient, thereby improving the work efficiency of the installer.

[0074] For example, during the installation of the powder spray gun 10 and the flue, the powder spray gun 10 can be connected to a flange interface pre-set in the flue via its own connecting flange (first connecting member 15 and second connecting member 16). For example, for a renovation project of an existing flue, a flange interface can be installed by drilling a hole in the flue, inserting the powder spray gun 10 into the flange interface, and then securely connecting the connecting flange on the powder spray gun 10 to the connecting flange on the flue. This reduces the renovation workload and facilitates implementation. For new projects, a flange interface can be pre-set in the flue, and the powder spray gun 10 can be inserted into the flange interface and connected to the connecting flange.

[0075] Please refer to Figure 6 and Figure 10 , Figure 10 yes Figure 6The cross-sectional structural diagram of the powder spray gun 10 along the A1-A2 position is shown. Optionally, the powder spray gun 10 may further include a plurality of first reinforcing ribs 18 and a plurality of second reinforcing ribs 19. The plurality of first reinforcing ribs 18 may be distributed around the first feeding pipe 12, and the first reinforcing ribs 18 are fixedly connected to the first tube shell 11 and the first feeding pipe 12, respectively. The materials of the first tube shell 11, the first feeding pipe 12 and the first reinforcing rib 18 may all include metal, and the two ends of the first reinforcing rib 18 may be welded to the first tube shell 11 and the first feeding pipe 12, respectively.

[0076] Multiple second reinforcing ribs 19 are distributed around the second feeding pipe 14 and are fixedly connected to the second tube shell 13 and the second feeding pipe 14 respectively. The materials of the second tube shell 13, the second feeding pipe 14 and the second reinforcing ribs 19 can all include metal, and the two ends of the second reinforcing ribs 19 can be welded to the second tube shell 13 and the second feeding pipe 14 respectively.

[0077] The plurality of first reinforcing ribs 18 are all located at one end of the first tube shell 11 close to the second tube shell 13, and the plurality of second reinforcing ribs 19 are all located at one end of the second tube shell 13 close to the first tube shell 11. The plurality of first reinforcing ribs 18 and the plurality of second reinforcing ribs 19 correspond one to one, and the first reinforcing ribs 18 and the corresponding second reinforcing ribs 19 at least partially overlap in the axial direction of the first tube shell 11.

[0078] In this way, the first tube shell 11 and the first feeding tube 12 can be fixedly connected by the first reinforcing rib 18, and a supporting role can be played between the first tube shell 11 and the first feeding tube 12 to maintain the shape of the first gas flow channel d1. Similarly, the second tube shell 13 and the second feeding tube 14 can be fixedly connected by the second reinforcing rib 19, and a supporting role can be played between the second tube shell 13 and the second feeding tube 14 to maintain the shape of the second gas flow channel d2.

[0079] Furthermore, the one-to-one correspondence between the plurality of first reinforcing ribs 18 and the plurality of second reinforcing ribs 19 can serve as a positioning mechanism when assembling the powder spray gun 10, thereby reducing the difficulty of aligning and assembling the first connecting member 15 and the second connecting member 16. For example, the number of the first reinforcing ribs 18 and the second reinforcing ribs 19 can range from 2 to 6. Within this range, the first reinforcing ribs 18 and the second reinforcing ribs 19 can both serve as a connecting support and not affect the ventilation of the first gas flow channel d1 and the second gas flow channel d2. For example, the number of the first reinforcing ribs 18 and the second reinforcing ribs 19 can each be 2, 3, or 4.

[0080] Please refer to Figure 11 and Figure 12 , Figure 11 This is a schematic diagram of the connection structure of a swirl blade 110 provided in an embodiment of the present utility model. Figure 12 yes Figure 11 The structural schematic diagram of the connection structure of the swirl blade 110 shown in another perspective, in an optional embodiment, the powder spray gun 10 can also include a plurality of swirl blades 110, the plurality of swirl blades 110 are located in the second gas flow channel d2 and are arranged adjacent to the gas outlet k2, the plurality of swirl blades 110 are distributed around the feeding pipe, one end of the swirl blade 110 is fixedly connected to the outer wall of the second feeding pipe 14, and the other end is fixedly connected to the inner wall of the second tube shell 13.

[0081] Multiple swirl blades 110 may also be disposed adjacent to the discharge port b2 of the second feed pipe 14. For example, the number of swirl blades 110 may be greater than or equal to 3 and less than or equal to 36. For example, the number of swirl blades 110 may be 3, 6, 10, or 18. The angle between the plane on which each swirl blade 110 resides and the direction in which the high-speed airflow flows toward the swirl blade 110 may be greater than or equal to 0 degrees and less than or equal to 90 degrees. For example, the angle between the plane on which each swirl blade 110 resides and the direction in which the high-speed airflow flows toward the swirl blade 110 is 30 degrees, 45 degrees, 50 degrees, or 60 degrees. It should be noted that when the angle between the plane on which the swirl blade 110 resides and the direction in which the high-speed airflow flows toward the swirl blade 110 is 90 degrees, the plane on which the swirl blade 110 resides and the direction in which the high-speed airflow flows toward the swirl blade 110 are perpendicular to each other. The angles between the planes where the multiple swirl blades 110 are located and the direction in which the high-speed airflow flows toward the swirl blades 110 can be equal, and in actual application, the number of swirl blades 110 and the angle between the planes where the swirl blades 110 are located and the direction in which the high-speed airflow flows toward the swirl blades 110 can be determined according to the diffusion effect of the desulfurizer. The embodiments of the present invention do not limit this.

[0082] In an exemplary embodiment, the angle between the plane where each swirl blade 110 is located and the plane where the air outlet k2 of the second tube shell 13 is located can be greater than or equal to 0 degrees and less than or equal to 90 degrees. Exemplarily, the angle between the plane where each swirl blade 110 is located and the plane where the air outlet k2 of the second tube shell 13 is located is 30 degrees, 45 degrees, 50 degrees, or 60 degrees, to form a swirl air outlet.

[0083] In the embodiment of the present invention, during use of the powder spray gun 10, a high-speed airflow can enter the first airflow channel through the air inlet k1 of the first tube shell 11 and flow through the second airflow channel connected to the first airflow channel to the air outlet k2 of the second tube shell 13. Because the air outlet k2 of the second tube shell 13 is located at the position of multiple swirl blades 110, when the high-speed airflow flows through the air outlet k2, the multiple swirl blades 110 can change the flow direction of the high-speed airflow, thereby forming a rotating airflow. At the same time, the desulfurizer introduced from the feed port b1 of the first feed pipe 12 passes through the first feed pipe 12 and the second feed pipe 14 and is ejected from the discharge port b2 into the area where the rotating airflow is located. The desulfurizer and the rotating airflow are ejected at substantially the same location. Driven by the rotating airflow, the desulfurizer can quickly diffuse in a conical shape, thereby improving the desulfurizer's ability to diffuse to all sides, allowing the desulfurizer to be fully and evenly mixed with the flue gas, thereby improving the powder spray gun 10's ability to remove harmful substances from the flue gas.

[0084] In an exemplary embodiment, the powder spray gun 10 may further include a sealing plate structure, which may be located at an end of the first tube shell 11 facing away from the second tube shell 13, and the sealing plate structure may surround the first feeding pipe 12 and be fixedly connected to the first tube shell 11 and the first feeding pipe 12, respectively, to prevent the gas in the first airflow channel from leaking from the end of the first tube shell 11 facing away from the second tube shell 13.

[0085] To sum up, the embodiment of the present invention provides a powder spray gun, including a first tube shell, a first feeding pipe, a second tube shell and a second feeding pipe, which are detachably connected through the first tube shell and the second tube shell, and the first feeding pipe and the second feeding pipe are plugged in, so that when installing or repairing the powder spray gun, the installer can choose to replace the appropriate second feeding pipe and the second tube shell to connect to the first tube shell and the first feeding pipe according to the current actual working conditions, without replacing the first tube shell, the first feeding pipe and other equipment connected to the first tube shell and the first feeding pipe; in this way, the applicability of the powder spray gun can be improved, and the overall structure of the powder spray gun is simple and easy to process and manufacture. At the same time, the segmented structure can reduce the difficulty of transportation, installation and maintenance.

[0086] Moreover, by plugging the first feeding pipe and the second feeding pipe, the first feeding pipe and the second feeding pipe can be fused into one in the plugging area, ensuring the connection stability of the first feeding pipe and the second feeding pipe, and avoiding the first feeding pipe and the second feeding pipe from being detached or misplaced when the powder spray gun is subjected to external impact.

[0087] Please refer to Figure 13 , Figure 13It is a structural schematic diagram of a powder injection device 20 provided in an embodiment of the present invention. The powder injection device 20 may include a mounting frame 30, an auxiliary blower 40 and a powder spray gun 10. The blower and the powder spray gun 10 are both assembled in the mounting frame 30, and the air outlet of the blower is connected to the air inlet of the powder spray gun 10. The powder spray gun 10 is the powder spray gun 10 in any of the above embodiments. The auxiliary blower 40 and the powder spray gun 10 can be fixed on the frame to form a skid-mounted structure. The auxiliary blower 40 may include a centrifugal blower. Exemplarily, the mounting frame 30 includes a shell and a mounting plate located in the shell. A plurality of mounting plates can be fixedly connected to the shell, and the auxiliary blower 40 and the powder spray gun 10 can be welded to the mounting plate.

[0088] The powder injection device 20 may further include a soft connection structure 50, which may be connected to the auxiliary blower 40 and the powder spray gun 10, respectively. Exemplarily, the soft connection structure 50 may be an expansion joint, which connects the auxiliary blower 40 and the powder spray gun 10 through the expansion joint, thereby reducing the impact of the vibration generated by the auxiliary blower 40 during operation on the powder spray gun 10.

[0089] Please refer to Figure 13 In an exemplary embodiment, the powder spray gun 10 may further include a third tube shell 120, one end of which may be fixedly connected to the air inlet of the first tube shell 11, and the other end of the third tube shell 120 may be fixedly connected to the air outlet of the auxiliary blower 40, or the other end of the third tube shell 120 may be fixedly connected to the expansion joint. The angle between the extension direction of the third tube shell 120 and the extension direction of the first tube shell 11 may be an acute angle. For example, the angle between the extension direction of the third tube shell 120 and the extension direction of the first tube shell 11 may be 45 degrees. In this way, the resistance of the high-speed airflow in the third tube shell 120 when entering the first gas flow channel can be reduced, thereby ensuring a better circulation effect of the high-speed airflow. For example, the first tube shell 11, the second tube shell 13 and the third tube shell 120 may all be columnar. The first tube shell 11 and the third tube shell 120 can be formed separately and then connected by fixed connection (such as welding); or the first tube shell 11 and the third tube shell 120 can also be formed as one piece, which is not specifically limited in the embodiment of the present invention.

[0090] In an exemplary embodiment, the powder injection device 20 may further include a powder conveying pipe. The first feeding pipe 12 may be connected to the feeding device through the powder conveying pipe. The first feeding pipe 12 may be flange-connected or threaded to the powder conveying pipe.

[0091] In the embodiment of the present invention, by integrating the mounting frame 30, the auxiliary blower 40 and the powder spray gun 10 into a skid-mounted structure, when the powder injection device 20 is connected to the flue, there is no need to assemble the powder injection device 20 at the installation site, which can reduce the workload at the installation site. In addition, the skid-mounted structure is relatively compact as a whole, occupies a small area, can be moved as a whole, can improve the reuse rate of the equipment, and can improve the applicability of the powder injection device 20.

[0092] In the present invention, the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0093] The above description is merely an optional embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A powder spray gun, characterized in that: The powder spray gun comprises: a first tube shell, a first feeding pipe, a second tube shell and a second feeding pipe; The first tube shell has an air inlet, one end of the first tube shell is detachably connected to one end of the second tube shell, and the end of the second tube shell facing away from the first tube shell has an air outlet; The first tube shell is sleeved outside the first feeding pipe, and a first gas flow channel communicating with the gas inlet is formed between the outer wall of the first feeding pipe and the inner wall of the first tube shell; The second tube shell is sleeved outside the second feeding pipe, and a second gas flow channel communicating with the gas outlet is formed between the outer wall of the second feeding pipe and the inner wall of the second tube shell; Wherein, one end of the first feeding pipe close to the second feeding pipe is located outside the first tube shell and extends into the second feeding pipe, or one end of the second feeding pipe close to the first feeding pipe is located outside the second tube shell and extends into the first feeding pipe.

2. The powder spray gun according to claim 1, characterized in that: One of the first feeding pipe and the second feeding pipe is a first target feeding pipe, the other of the first feeding pipe and the second feeding pipe is a second target feeding pipe, and a portion of the first target feeding pipe extends into the second target feeding pipe; The outer wall of a portion of the tube body of the first target feeding tube is gap-fitted with the inner wall of the second target feeding tube.

3. The powder spray gun according to claim 2, characterized in that: The first target feeding pipe includes a first pipe body and a second pipe body connected to each other, the first pipe body is at least partially located inside the second target feeding pipe, and the second pipe body is located outside the second target feeding pipe; The outer diameter of the first tube body is smaller than or equal to the inner diameter of the second target feeding tube, and the outer diameter of the second tube body is larger than the inner diameter of the second target feeding tube.

4. The powder spray gun according to claim 3, characterized in that: The first target feeding pipe is the first feeding pipe; The inner diameter of at least a portion of the first tube body gradually decreases along a first direction, and the first direction is a direction from the first tube shell to the second tube shell.

5. The powder spray gun according to claim 4, characterized in that: The first pipe body includes a first sub-pipe and a second sub-pipe connected; The first sub-tube is located on a side of the second sub-tube away from the second tube body, and both the inner diameter and the outer diameter of the first sub-tube gradually decrease in the first direction.

6. The powder spray gun according to claim 1, characterized in that: The powder spray gun further includes a first connecting member, a second connecting member and a locking member, wherein the locking member is detachably connected to at least one of the first connecting member and the second connecting member; The first connecting member is fixedly connected to one end of the first tube shell close to the second tube shell, and the second connecting member is fixedly connected to one end of the second tube shell close to the first tube shell.

7. The powder spray gun according to claim 6, characterized in that: The first connecting member and the second connecting member both have connecting holes, and the locking member passes through the connecting holes and is detachably connected to the flue.

8. The powder spray gun according to claim 1, characterized in that: The powder spray gun further includes a plurality of first reinforcing ribs and a plurality of second reinforcing ribs, wherein the plurality of first reinforcing ribs are distributed around the first feeding pipe and are fixedly connected to the first tube shell and the first feeding pipe, respectively; and the plurality of second reinforcing ribs are distributed around the second feeding pipe and are fixedly connected to the second tube shell and the second feeding pipe, respectively. The multiple first reinforcing ribs are all located at one end of the first tube shell close to the second tube shell, and the multiple second reinforcing ribs are all located at one end of the second tube shell close to the first tube shell. The multiple first reinforcing ribs correspond to the multiple second reinforcing ribs one by one, and the first reinforcing ribs and the corresponding second reinforcing ribs at least partially overlap in the axial direction of the first tube shell.

9. The powder spray gun according to claim 1, characterized in that: The powder spray gun also includes a plurality of swirl blades, which are located in the second gas flow channel and arranged adjacent to the gas outlet. The plurality of swirl blades are distributed around the second feeding pipe, and one end of the swirl blade is fixedly connected to the outer wall of the second feeding pipe, and the other end is fixedly connected to the inner wall of the second tube shell.

10. A powder injection device, characterized in that: The powder injection device includes a mounting frame, an auxiliary air blower and a powder spray gun, wherein the auxiliary air blower and the powder spray gun are both assembled in the mounting frame, and the air outlet of the auxiliary air blower is connected to the air inlet of the powder spray gun, and the powder spray gun is the powder spray gun described in any one of claims 1-9.

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