Automatic ammonia spraying device for denitration of heating furnace

Abstract

The utility model belongs to the technical field of flue gas purification, and discloses a heating furnace denitration automatic ammonia spraying device which comprises a boiler body and a liquid storage tank, the liquid storage tank is installed on the outer surface of the boiler body, a through hole is formed in the side, close to the liquid storage tank, of the boiler body, and the drainage end of the liquid storage tank is connected with a connecting pipe. A water conveying mechanism for limiting the discharge amount of ammonia water is installed at the water discharging end of the connecting pipe and penetrates through a through hole in the boiler body, multiple sets of protection mechanisms are arranged in the water conveying mechanism, and the water conveying mechanism is started in a triggering mode, so that ammonia water sprayed out of the water conveying mechanism can be regulated and controlled according to the nitrate content of gas in the boiler body; therefore, waste caused by excessive usage amount of ammonia water is avoided as much as possible, and the practicability of the equipment is improved; and the drainage end of the water conveying mechanism is blocked through the protection mechanism, so that particulate matter in the boiler body is prevented from entering the water conveying mechanism to cause blockage in the water conveying mechanism as much as possible.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas purification, in particular to an automatic ammonia spraying device for denitration of a heating furnace. Background Art

[0002] Since ammonia has good denitrification performance, it is widely used in boiler flue gas denitrification. Ammonia gas or ammonia water as a denitrification agent is injected into the inlet of the SCR denitrification reactor and enters the reactor together with the flue gas to react and reduce the nitrogen oxides in the flue gas to nitrogen.

[0003] For example, the utility model with announcement number CN216964157U discloses an automatically adjustable ammonia spraying device, which mainly relates to the field of flue gas purification, including a main pipe, a plurality of branch pipes are connected along the length direction of the main pipe, the ends of the branch pipes are connected to a gas collecting shell, the top of the gas collecting shell is connected to a nozzle, a truncated cone-shaped air guide valve is provided in the gas collecting shell and above the branch pipe port, the bottom edge of the air guide valve is in contact with the inner wall of the gas collecting shell, and the air guide valve can slide up and down in the gas collecting shell, a counterweight block is provided at the nozzle, and the counterweight block is connected to the air guide valve through a connecting rod. The beneficial effects of the utility model are: utilizing the driving force of ammonia itself, combined with the narrow tube effect, dynamically adjusting the ammonia flow rate in each gas collecting shell, achieving the matching of the ammonia amount and the flue gas distribution condition, being able to automatically adjust the ammonia flow rate, and being able to effectively avoid a series of problems caused by nozzle blockage caused by smoke dust sedimentation and ash collapse.

[0004] In the process of implementing the present application, it was found that the technology has the following problems: most of the existing automatically adjustable ammonia spraying devices automatically adjust the ammonia flow rate through the driving force of the ammonia itself and the narrow tube effect, so as to achieve the matching of the ammonia amount and the flue gas distribution condition, but the driving force of the ammonia itself and the narrow tube effect inside most ammonia spraying devices cannot adjust the ammonia emission, resulting in large and wasteful ammonia consumption, thereby reducing the practicality of the equipment.

[0005] For this purpose, an automatic ammonia injection device for denitrification of a heating furnace is proposed. Utility Model Content

[0006] The purpose of the utility model is to solve the problem that the driving force of ammonia itself and the narrow tube effect in most ammonia spraying devices cannot regulate the emission of ammonia, thus resulting in large and wasteful ammonia consumption. The utility model provides an automatic ammonia spraying device for denitrification of a heating furnace.

[0007] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0008] A heating furnace denitrification automatic ammonia spraying device comprises a boiler body and a liquid storage tank, wherein the liquid storage tank is mounted on the outer surface of the boiler body, a through hole is provided on a side of the boiler body close to the liquid storage tank, a connecting pipe is connected to the drainage end of the liquid storage tank, a water supply mechanism for limiting the discharge amount of ammonia water is installed at the drainage end of the connecting pipe through the internal through hole of the boiler body, and a plurality of protective mechanisms are arranged inside the water supply mechanism.

[0009] Furthermore, the water supply mechanism includes a water supply pipe 1, the water inlet end of the water supply pipe 1 is installed inside the drainage end of the connecting pipe, and multiple groups of through holes are provided on the side of the water supply pipe 1 away from the inner wall of the boiler body, and water supply pipe 2 is installed inside the multiple groups of through holes of the water supply pipe 1, and nozzles are installed inside the water supply ends of multiple groups of water supply pipes 2, and electromagnetic flow valves are arranged inside the multiple groups of water supply pipes 2, and an environmental protection online detection instrument and a denitrification PLC controller are installed on the upper surface of the water supply pipe 1, and the output end of the environmental protection online detection instrument is electrically connected between the denitrification PLC controller and the control ends of the multiple groups of electromagnetic flow valves.

[0010] Furthermore, the water delivery pipe 1 is in a U-shape, and the positions of the plurality of nozzles are symmetrically arranged at the front and rear sides of the central area inside the boiler body.

[0011] Furthermore, multiple groups of the protective mechanisms all include fixed blocks, and multiple groups of the fixed blocks are respectively installed on the upper surfaces of multiple groups of the water pipes two, and the upper surfaces of multiple groups of the fixed blocks are provided with grooves, and the grooves of multiple groups of the fixed blocks are rotatably connected with protective discs, and the sides of multiple groups of the protective discs close to the water pipe one are respectively abutted against the end of an adjacent group of nozzles away from the water pipe one.

[0012] Furthermore, a fixing ring is installed on one side of the plurality of groups of protection discs close to the water pipe 1, and the outer surfaces of the plurality of groups of fixing rings are respectively clamped in the interior of an adjacent group of nozzles.

[0013] Furthermore, limit blocks are installed on the upper surfaces of the plurality of groups of fixed blocks, and the positions of the plurality of groups of limit blocks are respectively located on the moving paths of the adjacent groups of protective discs.

[0014] The beneficial effects of the utility model are as follows:

[0015] 1. The utility model detects the gas inside the boiler body by quantity through an environmental online detection instrument. When the nitrate content of the gas inside the boiler body exceeds the preset value of the denitrification PLC controller, the denitrification PLC controller triggers and starts multiple sets of electromagnetic flow valves, so that the environmental online detection instrument measures data to control the denitrification PLC controller to adjust the opening degree of the multiple sets of electromagnetic flow valves, thereby achieving the purpose of automatic ammonia spraying control and avoiding the waste caused by excessive use of ammonia water, thereby improving the practicality of the equipment.

[0016] 2. The utility model abuts the water spraying end of the nozzle with one side of the protective disc close to the water supply pipe, so that the protective disc blocks the drainage end of the nozzle, thereby avoiding as much as possible the particles inside the boiler body from entering the interior of the nozzle and causing blockage inside the nozzle, thereby reducing the number of times the staff regularly cleans the nozzle; the protective disc is rotatably connected to the inside of the groove of the fixed block, so that when ammonia water is sprayed out of the nozzle, the ammonia water pushes the protective disc to rotate inside the groove of the fixed block, thereby avoiding as much as possible the protective disc blocking the normal use of the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the top surface structure of the utility model;

[0018] Figure 2 It is a side structural schematic diagram of the utility model;

[0019] Figure 3 It is a structural schematic diagram of the protective mechanism of the utility model;

[0020] Figure 4 This utility model Figure 1 Enlarged view of point A in the middle.

[0021] Figure numerals: 1. boiler body; 2. connecting pipe; 3. water supply mechanism; 301. water supply pipe 1; 302. environmental protection online detection instrument; 303. denitrification PLC controller; 304. water supply pipe 2; 305. electromagnetic flow valve; 306. nozzle; 4. liquid storage tank; 5. protection mechanism; 501. fixing block; 502. protection disc; 503. fixing ring; 6. limit block. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. 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.

[0024] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0025] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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.

[0026] like Figures 1 to 4 As shown, an automatic ammonia spraying device for denitrification of a heating furnace includes a boiler body 1 and a liquid storage tank 4, wherein the liquid storage tank 4 is mounted on the outer surface of the boiler body 1, a through hole is provided on one side of the boiler body 1 close to the liquid storage tank 4, a connecting pipe 2 is connected to the drainage end of the liquid storage tank 4, a water supply mechanism 3 for limiting the discharge of ammonia water is installed at the drainage end of the connecting pipe 2 through the internal through hole of the boiler body 1, and a plurality of protective mechanisms 5 are arranged inside the water supply mechanism 3; specifically, the water supply mechanism 3 is triggered to start, so that the ammonia water sprayed by the water supply mechanism 3 can be adjusted according to the nitrate content of the gas inside the boiler body 1, thereby avoiding waste caused by excessive use of ammonia water as much as possible, thereby improving the practicability of the equipment; the drainage end of the water supply mechanism 3 is blocked by the protective mechanism 5, thereby avoiding particulate matter inside the boiler body 1 from entering the water supply mechanism 3 to cause blockage inside the water supply mechanism 3 as much as possible, thereby reducing the number of times the staff regularly cleans the water supply mechanism 3.

[0027] like Figure 1 and Figure 2As shown, the water delivery mechanism 3 includes a water delivery pipe 1 301, the water inlet end of the water delivery pipe 1 301 is installed inside the drainage end of the connecting pipe 2, a plurality of through holes are provided on the side of the water delivery pipe 1 301 away from the inner wall of the boiler body 1, a water delivery pipe 2 304 is installed inside the plurality of through holes of the water delivery pipe 1 301, a nozzle 306 is installed inside the water delivery end of the plurality of water delivery pipes 2 304, an electromagnetic flow valve 305 is arranged inside the plurality of water delivery pipes 2 304, an environmental protection online detection instrument 302 and a denitration PLC controller 303 are installed on the upper surface of the water delivery pipe 1 301, and the output end of the environmental protection online detection instrument 302 is connected to the denitration PLC controller 303 through the denitration PLC controller 303 The plurality of electromagnetic flow valves 305 are electrically connected to the control ends thereof; specifically, when the boiler body 1 is in use, the amount of gas inside the boiler body 1 is detected by the environmental protection online detection instrument 302. When the nitrate content of the gas inside the boiler body 1 exceeds the preset value of the denitrification PLC controller 303, the denitrification PLC controller 303 triggers and starts the plurality of electromagnetic flow valves 305, so that the environmental protection online detection instrument 302 measures data to control the denitrification PLC controller 303 to adjust the opening degree of the plurality of electromagnetic flow valves 305, thereby achieving the purpose of automatic ammonia spraying control and reducing the waste caused by excessive use of ammonia water, thereby improving the practicability of the equipment.

[0028] like Figure 1 and Figure 2 As shown, the shape of the water delivery pipe 301 is U-shaped, and the positions of the multiple groups of nozzles 306 are symmetrically arranged on the front and rear sides of the central area inside the boiler body 1; specifically, the multiple groups of nozzles 306 are arranged in a rectangular shape inside the boiler body 1, so that the multiple groups of nozzles 306 can spray the ammonia water inside the boiler body 1 without dead angles, which is beneficial to the uniformity of the denitrification reaction, thereby improving the denitrification rate of the water delivery mechanism 3.

[0029] like Figure 3 and Figure 4 As shown, the multiple groups of protection mechanisms 5 all include fixed blocks 501, and the multiple groups of fixing blocks 501 are respectively installed on the upper surfaces of the multiple groups of water pipes 2 304. The upper surfaces of the multiple groups of fixing blocks 501 are all provided with grooves, and the grooves of the multiple groups of fixing blocks 501 are rotatably connected with protective discs 502. The sides of the multiple groups of protective discs 502 close to the water pipe 1 301 are respectively abutted against the ends of the adjacent groups of nozzles 306 away from the water pipe 1 301; specifically, the side of the protective disc 502 close to the water pipe 1 301 is abutted against the water spraying end of the nozzle 306, so that the protective disc 502 blocks the drainage end of the nozzle 306, thereby avoiding as much as possible the particles inside the boiler body 1 from entering the interior of the nozzle 306 and causing blockage inside the nozzle 306, thereby reducing the number of times the staff regularly cleans the nozzle 306.

[0030] At the same time, the protective disc 502 is rotatably connected to the groove of the fixed block 501, so that when ammonia water is sprayed out from the nozzle 306, the ammonia water pushes the protective disc 502 to rotate inside the groove of the fixed block 501, thereby avoiding as much as possible the protective disc 502 blocking the normal use of the nozzle 306.

[0031] like Figure 3 and Figure 4 As shown, a plurality of groups of protective discs 502 are each installed with a fixed ring 503 on one side close to the water pipe 301, and the outer surfaces of the plurality of groups of fixed rings 503 are respectively clamped in the interior of an adjacent group of nozzles 306; specifically, when the nozzle 306 is idle, the protective disc 502 rotates downward under the action of gravity, and then the position of the nozzle 306 is located on the moving path of the protective disc 502, so that the protective disc 502 drives the fixed ring 503 to be clamped in the interior of the nozzle 306 during the rotation process, so that the fixed ring 503 blocks the connection between the nozzle 306 and the protective disc 502, thereby preventing the particles inside the boiler body 1 from entering the interior of the nozzle 306 along the connection between the nozzle 306 and the protective disc 502 as much as possible.

[0032] like Figure 3 and Figure 4 As shown, the upper surfaces of the multiple groups of fixed blocks 501 are all installed with limiting blocks 6, and the positions of the multiple groups of limiting blocks 6 are respectively located on the moving paths of the adjacent groups of protective discs 502; specifically, when the ammonia water sprayed from the nozzle 306 pushes the protective disc 502 to rotate, the position of the limiting block 6 is located on the moving path of the protective disc 502, so that the limiting block 6 limits the moving position of the protective disc 502, thereby preventing the ammonia water sprayed from the nozzle 306 from pushing the protective disc 502 to the upper end of the fixed block 501, which makes it impossible for the protective disc 502 to be reset after the nozzle 306 is idle.

[0033] In summary: when the boiler body 1 is in use, the environmental protection online detection instrument 302 is used to detect the amount of gas inside the boiler body 1. When the nitrate content of the gas inside the boiler body 1 exceeds the preset value of the denitrification PLC controller 303, the denitrification PLC controller 303 triggers and starts multiple sets of electromagnetic flow valves 305, so that the environmental protection online detection instrument 302 measures data to control the denitrification PLC controller 303 to adjust the opening degree of the multiple sets of electromagnetic flow valves 305, thereby achieving the purpose of automatic ammonia spraying control and reducing the waste caused by excessive use of ammonia water, thereby improving the practicability of the equipment.

[0034] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A heating furnace denitration automatic ammonia spraying device, comprising a boiler body (1) and a liquid storage tank (4), characterized in that: The liquid storage tank (4) is installed on the outer surface of the boiler body (1); a through hole is provided on a side of the boiler body (1) close to the liquid storage tank (4); a connecting pipe (2) is connected to the drainage end of the liquid storage tank (4); a water supply mechanism (3) for limiting the amount of ammonia water discharged is installed at the drainage end of the connecting pipe (2) through the internal through hole of the boiler body (1); and a plurality of protective mechanisms (5) are arranged inside the water supply mechanism (3).

2. The automatic ammonia spraying device for denitration of a heating furnace according to claim 1 is characterized in that: The water delivery mechanism (3) comprises a water delivery pipe (301), the water inlet end of the water delivery pipe (301) being installed inside the drainage end of the connecting pipe (2), a plurality of through holes being provided on the side of the water delivery pipe (301) away from the inner wall of the boiler body (1), a water delivery pipe (304) being installed inside the plurality of through holes of the water delivery pipe (301), a nozzle (306) being installed inside the water delivery ends of the plurality of water delivery pipes (304), an electromagnetic flow valve (305) being arranged inside the plurality of water delivery pipes (304), an environmental protection online detection instrument (302) and a denitration PLC controller (303) being installed on the upper surface of the water delivery pipe (301), and an output end of the environmental protection online detection instrument (302) being electrically connected to the control ends of the plurality of electromagnetic flow valves (305) via the denitration PLC controller (303).

3. The automatic ammonia spraying device for denitration of a heating furnace according to claim 2 is characterized in that: The water delivery pipe 1 (301) is in a U-shape, and the positions of the plurality of nozzles (306) are symmetrically arranged at the front and rear sides of the central area inside the boiler body (1).

4. The automatic ammonia spraying device for denitration of a heating furnace according to claim 2 is characterized in that: The plurality of groups of protection mechanisms (5) all include fixed blocks (501), which are respectively mounted on the upper surfaces of the plurality of groups of water pipes (304), and the upper surfaces of the plurality of groups of fixing blocks (501) are provided with grooves, and the grooves of the plurality of groups of fixing blocks (501) are rotatably connected with protection discs (502), and the sides of the plurality of groups of protection discs (502) close to the water pipe (301) are respectively abutted against the ends of the adjacent groups of nozzles (306) away from the water pipe (301).

5. The automatic ammonia spraying device for denitration of a heating furnace according to claim 4 is characterized in that: A fixing ring (503) is installed on one side of the plurality of groups of protection discs (502) close to the water pipe 1 (301), and the outer surfaces of the plurality of groups of fixing rings (503) are respectively clamped in the interior of an adjacent group of the nozzles (306).

6. The automatic ammonia spraying device for denitration of a heating furnace according to claim 5 is characterized in that: Limit blocks (6) are installed on the upper surfaces of the plurality of groups of fixed blocks (501), and the positions of the plurality of groups of limit blocks (6) are respectively located on the moving paths of the adjacent groups of protective discs (502).

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