A dust accumulation prevention device for spray gun

Abstract

The present application provides a spray gun dust accumulation prevention device, which relates to the technical field of atmospheric pollutant control, and comprises a spray gun nozzle and a guide arc protective cover. The guide arc protective cover is arranged on the outside of the spray gun nozzle, and the guide arc protective cover comprises a connecting part, a first cover body part and a second cover body part. The connecting part is arranged on the outer wall of the spray gun nozzle, and the first cover body part and the second cover body part are sleeved on the spray gun nozzle. The first cover body part is a conical cover body, and the outer edge and the inner edge of the axial section thereof are both inwardly concave arc edges, and the outer wall of the second cover body part is a conical surface, thereby playing a role of guiding and diffusing the disturbed airflow around the nozzle, so that the mixture of smoke and dust is diffused along the special arc surface and away from the nozzle outlet position, thereby preventing dust from adhering to the nozzle.

Description

Technical Field

[0001] The present application relates to the technical field of air pollutant treatment, and in particular to a device for preventing dust accumulation in a spray gun. Background Art

[0002] The flue gas containing dust and SO2 from the boiler enters the absorption tower from the bottom of the desulfurization tower through the venturi tube. After reacting with the absorbent, the flue gas temperature is usually 15℃ higher than the dew point temperature and enters the rear dust collector. After the quicklime is digested with water in the digester, it is stored in the slaked lime warehouse. A certain amount of slaked lime powder and water are added at the upper end of the venturi throat. The water is generally added by a high-pressure reflux spray gun or a dual-fluid atomizing spray gun.

[0003] During use, the flow velocity at the spray gun nozzle is relatively high, especially the linear velocity at the nozzle outlet of the dual-fluid atomizing spray gun can reach 60-70m / s, while the flow velocity in the desulfurization tower is about 5m / s. Due to the high linear velocity of the liquid spraying out of the spray gun, the airflow around the nozzle will be accelerated, and a vortex-like turbulence phenomenon will be formed around the nozzle and the rear end. The wet ash that is dampened by water in the flue gas will adhere to the gun rod and nozzle whose temperature is lower than the temperature in the tower under the action of the vortex, and accumulate more and more, eventually causing the entire spray gun nozzle to be wrapped by wet ash and block the spray gun, causing the spray gun to be unable to be used normally. Utility Model Content

[0004] An embodiment of the present application provides a device for preventing dust accumulation in a spray gun, which changes the dust-carrying air flow field at the nozzle position through the special arc-shaped outer contour of the protective cover, thereby avoiding the problem of dust condensation and blockage caused by dust approaching the nozzle outlet.

[0005] The embodiment of the present application provides a spray gun dust accumulation prevention device, comprising a spray gun nozzle and a guide arc protective cover;

[0006] The spray end of the spray gun nozzle is provided with a plurality of spray gun spray holes;

[0007] The guide arc protective cover is sleeved on the spray gun nozzle, and the guide arc protective cover comprises a connecting portion, a first cover body portion and a second cover body portion, and the connecting portion, the first cover body portion and the second cover body portion are sequentially connected from bottom to top;

[0008] The connecting portion is arranged on the outer wall of the spray gun nozzle;

[0009] The first cover body is sleeved with the spray gun nozzle, the first cover body is a conical cover body, the narrow end of the first cover body is connected to the connecting part, the wide end of the first cover body is connected to the second cover body, and the outer edge and the inner edge of the axial section of the first cover body are both arc-shaped edges concave inwards;

[0010] The inner wall of the second cover body is smoothly connected to the inner wall of the first cover body, the outer wall of the second cover body is a cone, the wide end of which is connected to the first cover body, and the top of the second cover body is parallel to the top of the spray gun nozzle.

[0011] In a feasible implementation, the connecting portion is a fixing nut;

[0012] The outer wall of the spray gun nozzle is provided with an external thread, and the fixing nut is threadedly connected to the spray gun nozzle.

[0013] In a feasible implementation, the outer wall of the spray gun nozzle is fixed to an auxiliary nut, and the auxiliary nut is located on the side of the external thread away from the spray gun injection hole.

[0014] In a feasible implementation, the spray gun nozzle includes a connecting pipe and a tapered portion, and the wide-mouth end of the tapered portion is fixedly connected to the first end of the connecting pipe;

[0015] The plurality of spray gun spray holes are all arranged on the conical portion, and the plurality of spray gun spray holes are evenly distributed around the conical surface of the conical portion;

[0016] The external thread and the auxiliary nut are both arranged on the connecting pipe.

[0017] In a feasible implementation, the spray gun nozzle further includes an outer spiral tube, and the outer spiral tube is fixedly disposed at the second end of the connecting tube.

[0018] In a feasible implementation, the spray gun dust accumulation prevention device further includes a detection tube body and a detection mechanism;

[0019] The detection tube body comprises a tube body and a flange, wherein the flange is fixedly arranged at a first end of the tube body, and the spray gun nozzle is arranged at a second end of the tube body;

[0020] The detection mechanism is arranged on the tube body, and is used to detect one or more of the following items: smoke temperature, smoke humidity, and dust concentration in the smoke.

[0021] In a feasible implementation, the detection mechanism includes a dust concentration sensor;

[0022] The side wall of the tube body is provided with a first detection port, the dust concentration sensor is arranged at the first detection port, and the detection end of the dust concentration sensor extends into the tube body.

[0023] In a feasible implementation, the detection mechanism further includes a temperature and humidity sensor;

[0024] The side wall of the tube body is provided with a second detection port, the temperature and humidity sensor is arranged at the second detection port, and the detection end of the temperature and humidity sensor extends into the tube body.

[0025] An embodiment of the present application provides a spray gun anti-dust accumulation device, which provides a guide arc protection cover on the outside of the spray gun nozzle, the guide arc protection cover includes a connecting part, a first cover body part and a second cover body part, the connecting part is provided on the outer wall of the spray gun nozzle, the first cover body part and the second cover body part are sleeved on the spray gun nozzle, the first cover body part is a conical cover body, and the outer edge and the inner edge of the axial section are both inwardly concave arc edges, and the outer wall of the second cover body part is a conical surface, thereby playing a role in guiding and diffusing the disturbed airflow around the nozzle, so that the mixture of smoke and dust diffuses along the special arc surface and away from the nozzle outlet position, thereby preventing dust from adhering to the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the spray gun dust accumulation prevention device provided by the present application;

[0027] Figure 2 It is a structural schematic diagram of the guide arc protective cover;

[0028] Figure 3 It is a schematic diagram of the structure of the spray gun nozzle;

[0029] Figure 4 It is a cross-sectional view of the detection tube body and its connection structure.

[0030] Description of reference numerals:

[0031] 10-spray gun nozzle; 20-flow guide arc protection cover; 30-detection tube body; 40-detection mechanism;

[0032] 11-spray gun spray hole; 12-external thread; 13-auxiliary nut; 14-connecting pipe; 15-conical part; 16-external screw tube; 21-connecting part; 22-first cover body part; 23-second cover body part; 31-tube body; 32-flange; 33-first detection port; 34-second detection port; 41-dust concentration sensor; 42-temperature and humidity sensor. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0034] The SO2 and NOX emitted by coal-fired power plant boilers are prone to acid rain and photochemical pollution. With the increasingly stringent environmental protection, the SO2 and NOX pollution emissions from boiler flue gas are an urgent problem to be solved. In order to reduce the release of SO2 in thermal power flue gas, my country has successively promulgated a number of laws, standards, and regulations, such as eliminating small units with high energy consumption, upgrading and transforming technology, distributing and implementing flue gas desulfurization and coal-fired clean technology. The construction of flue gas desulfurization equipment is the top priority for controlling SO2 pollution in thermal power plants. Many experts and scholars are researching and developing desulfurization and denitrification technologies that are both economical and environmentally friendly. Dry and semi-dry flue gas desulfurization technologies have attracted much attention due to their advantages such as low investment, small footprint, and low water consumption.

[0035] For units with a sulfur content in coal less than 2%, or for old units with a remaining life of less than 10 years, or for existing power plants with limited site conditions, when installing desulfurization equipment, semi-dry process, dry process or other low-cost mature processes should be used as a priority, provided that environmental protection requirements permit.

[0036] Coal-fired power plants in water-scarce areas should adopt water-saving dry and semi-dry flue gas desulfurization processes.

[0037] It is not difficult to see that the semi-dry desulfurization process has obvious advantages over other desulfurization processes in terms of water saving, land saving and investment.

[0038] Introduction to semi-dry desulfurization technology and problems encountered during use:

[0039] The flue gas containing dust and SO2 coming out of the boiler enters the absorption tower through the venturi tube from the bottom of the desulfurization tower. After reacting with the absorbent, the flue gas temperature is usually higher than the dew point temperature by more than 15℃ and enters the rear dust collector. After the quicklime is digested in the digester with water, it is stored in the slaked lime warehouse. A certain amount of slaked lime powder and water are added at the upper end of the venturi throat. The water is generally added by a high-pressure reflux spray gun or a two-fluid atomizing spray gun. In use, due to the high flow rate at the spray gun nozzle, especially the linear velocity at the outlet position of the two-fluid atomizing spray gun nozzle can reach 60-70m / s, while the flow rate in the desulfurization tower is about 5m / s. Due to the high linear velocity of the liquid spraying out of the spray gun, the airflow around the nozzle will be accelerated, and a vortex-like turbulence phenomenon will be formed around the nozzle and the rear end. The wet ash in the flue gas that is damp with water will adhere to the gun rod and nozzle whose temperature is lower than the temperature in the tower under the action of the vortex, and accumulate more and more, eventually causing the entire spray gun nozzle to be wrapped by wet ash and block the spray gun, resulting in the spray gun being unable to be used normally. The present application mainly solves the problem that the water replenishment spray gun is easily clogged due to dust accumulation at the nozzle position during use. In the case of high ash viscosity, the spray gun may even need to be disassembled and cleaned after running for about two hours to ensure normal use, which seriously affects the normal operation of the equipment and causes large fluctuations in environmental protection data or failure to meet standards.

[0040] The specific structure of the spray gun dust accumulation prevention device provided in the present application is described in detail below in conjunction with the accompanying drawings.

[0041] Reference Figure 1-Figure 4 As shown, the embodiment of the present application provides a spray gun dust accumulation prevention device, comprising a spray gun nozzle 10 and a guide arc protective cover 20, the guide arc protective cover 20 is sleeved with the spray gun nozzle 10, and the spray gun nozzle 10 is completely located in the guide arc protective cover 20;

[0042] The spray end of the spray gun nozzle 10 is provided with a plurality of spray gun spray holes 11, which are inclined at an angle of 45°. The spray direction of the spray gun spray hole 11 does not contact the guide arc protective cover 20, and the smoke is sprayed obliquely upward from the spray gun spray hole 11;

[0043] like Figure 2 As shown, the guide arc protective cover 20 is sleeved on the spray gun nozzle 10, and the guide arc protective cover 20 includes a connecting portion 21, a first cover body portion 22 and a second cover body portion 23, and the connecting portion 21, the first cover body portion 22 and the second cover body portion 23 are connected in sequence from bottom to top;

[0044] The connection part 21 is disposed on the outer wall of the spray gun nozzle 10, and the connection part 21 is used to fix the guide arc protection cover 20 on the spray gun nozzle 10;

[0045] The first cover body 22 is sleeved with the spray gun nozzle 10, and the first cover body 22 is a conical cover body. The narrow end of the first cover body 22 is connected to the connecting portion 21, and the wide end of the first cover body 22 is connected to the second cover body 23. The outer edge and the inner edge of the axial section of the first cover body 22 are both arc-shaped edges concave inwards.

[0046] The inner wall of the second cover body 23 is smoothly connected to the inner wall of the first cover body 22, the outer wall of the second cover body 23 is a conical surface, and the wide end thereof is connected to the first cover body 22, the top end of the second cover body 23 is parallel to the top end of the spray gun nozzle 10, or the top end of the second cover body 23 is slightly higher than the top end of the spray gun nozzle 10;

[0047] The atomized process water is sprayed out at high speed from the spray gun injection holes 11 evenly distributed on the spray gun nozzle 10 to form diffused conical droplets. The high-speed mist water flow causes the smoke around the guide arc protective cover 20 to carry dust to form a vortex turbulence. The disturbed airflow diffuses along the conical outer wall of the second cover body 23 and the curved conical outer wall of the first cover body 22 and away from the nozzle outlet position, that is, the guide arc protective cover 20 has a function of guiding and diffusing the disturbed airflow around the nozzle to prevent dust from adhering to the nozzle.

[0048] Reference Figure 2 and Figure 3 As shown, in some embodiments, the connection portion 21 is a fixing nut, and the inner diameter of the fixing nut matches the outer diameter of the spray gun nozzle 10;

[0049] The outer wall of the spray gun nozzle 10 is provided with an external thread 12 , and the fixing nut is threadedly connected to the spray gun nozzle 10 , so as to facilitate the connection or separation of the guide arc protection cover 20 and the spray gun nozzle 10 .

[0050] Reference Figure 3 As shown, in some embodiments, the outer wall of the spray gun nozzle 10 is fixed to the auxiliary nut 13, and the auxiliary nut 13 is located on the side of the external thread 12 away from the spray gun injection hole 11. When removing or locking the guide arc protective cover 20, the fixing nut and the auxiliary nut 13 can be clamped respectively by two wrenches or other tools, and then the two wrenches are rotated relative to each other to separate or lock the guide arc protective cover 20 from the spray gun nozzle 10. The design of the auxiliary nut 13 facilitates the installation and disassembly of the guide arc protective cover 20.

[0051] Reference Figure 3 As shown, in some embodiments, the spray gun nozzle 10 includes a connecting pipe 14 and a tapered portion 15, the connecting pipe 14 is a vertically arranged pipe body, and the external thread 12 and the auxiliary nut 13 are both arranged on the connecting pipe 14;

[0052] The conical portion 15 is truncated cone-shaped, and its outer wall is a conical surface. The wide-mouth end of the conical portion 15 is fixedly connected to the top end of the connecting pipe 14. Multiple spray gun injection holes 11 are arranged on the conical portion 15. The multiple spray gun injection holes 11 are evenly distributed around the conical surface of the conical portion 15. The extension direction of the spray gun injection holes 11 is perpendicular to the conical surface of the conical portion 15, so that the smoke is sprayed out at an angle.

[0053] Reference Figure 3 As shown, in some embodiments, the spray gun nozzle 10 further includes an external spiral tube 16, which is fixed to the bottom end of the connecting tube 14 and can be connected to an external flue gas pipeline, thereby facilitating the fixed use of the spray gun anti-ash deposition device.

[0054] Reference Figure 1 and Figure 4 As shown, in some embodiments, the spray gun dust accumulation prevention device further includes a detection tube body 30 and a detection mechanism 40;

[0055] The detection tube body 30 includes a tube body 31 and a flange 32. The tube body 31 may be an L-shaped tube body. The flange 32 is fixedly arranged at the left end of the tube body 31. The spray gun nozzle 10 is arranged at the top end of the tube body 31.

[0056] The detection mechanism 40 is disposed on the tube body 31 , and is used to detect one or more of the smoke temperature, smoke humidity, and dust concentration in the smoke.

[0057] Reference Figure 4As shown, in some embodiments, the detection mechanism 40 includes a dust concentration sensor 41, and the dust concentration sensor 41 may be a LBT-GCG1000 type dust concentration sensor;

[0058] A first detection port 33 is provided on the side wall of the tube body 31, and the first detection port 33 can be a circular hole. The dust concentration sensor 41 is arranged on the first detection port 33, and the detection end of the dust concentration sensor 41 extends into the tube body 31. The dust concentration sensor 41 is connected to an external control system, so as to facilitate the monitoring of the dust concentration of the flue gas.

[0059] In some embodiments, the detection mechanism 40 further includes a temperature and humidity sensor 42, which may be a DHT11 temperature and humidity sensor;

[0060] A second detection port 34 is provided on the side wall of the tube body 31, and the second detection port 34 can be a circular hole. The temperature and humidity sensor 42 is arranged on the second detection port 34, and the detection end of the temperature and humidity sensor 42 extends into the tube body 31. The temperature and humidity sensor 42 is connected to an external control system, so as to facilitate the monitoring of the temperature and humidity of the flue gas.

[0061] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on the several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0062] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A spray gun dust accumulation prevention device, characterized in that: include; A spray gun nozzle (10), wherein a spray end of the spray gun nozzle (10) is provided with a plurality of spray gun spray holes (11); A guide arc-shaped protective cover (20), wherein the guide arc-shaped protective cover (20) is sleeved on the spray gun nozzle (10), and the guide arc-shaped protective cover (20) comprises a connecting portion (21), a first cover body portion (22), and a second cover body portion (23), wherein the connecting portion (21), the first cover body portion (22), and the second cover body portion (23) are sequentially connected from bottom to top; The connecting portion (21) is arranged on the outer wall of the spray gun nozzle (10); The first cover body (22) is sleeved with the spray gun nozzle (10), the first cover body (22) is a conical cover body, the narrow end of the first cover body (22) is connected to the connecting portion (21), the wide end of the first cover body (22) is connected to the second cover body (23), and the outer edge and the inner edge of the axial section of the first cover body (22) are both inwardly concave arc edges; The inner wall of the second cover body (23) is smoothly connected to the inner wall of the first cover body (22); the outer wall of the second cover body (23) is a conical surface, and its wide-mouth end is connected to the first cover body (22); the top end of the second cover body (23) is parallel to the top end of the spray gun nozzle (10).

2. The spray gun dust accumulation prevention device according to claim 1, characterized in that: The connecting portion (21) is a fixing nut; The outer wall of the spray gun nozzle (10) is provided with an external thread (12), and the fixing nut is threadedly connected to the spray gun nozzle (10).

3. The spray gun dust accumulation prevention device according to claim 2, characterized in that: The outer wall of the spray gun nozzle (10) is fixed to an auxiliary nut (13), and the auxiliary nut (13) is located on the side of the external thread (12) away from the spray gun injection hole (11).

4. The spray gun dust accumulation prevention device according to claim 3, characterized in that: The spray gun nozzle (10) comprises a connecting pipe (14) and a tapered portion (15), wherein the wide-mouth end of the tapered portion (15) is fixedly connected to the first end of the connecting pipe (14); The plurality of spray gun spray holes (11) are all arranged on the conical portion (15), and the plurality of spray gun spray holes (11) are evenly distributed around the conical surface of the conical portion (15); The external thread (12) and the auxiliary nut (13) are both arranged on the connecting pipe (14).

5. The spray gun dust accumulation prevention device according to claim 4, characterized in that: The spray gun nozzle (10) further comprises an external spiral tube (16), wherein the external spiral tube (16) is fixedly arranged at the second end of the connecting tube (14).

6. The spray gun dust accumulation prevention device according to claim 1, characterized in that: The spray gun dust accumulation prevention device also includes a detection tube body (30) and a detection mechanism (40); The detection tube body (30) comprises a tube body (31) and a flange (32), wherein the flange (32) is fixedly arranged at a first end of the tube body (31), and the spray gun nozzle (10) is arranged at a second end of the tube body (31); The detection mechanism (40) is arranged on the tube body (31), and the detection mechanism (40) is used to detect one or more of the following: smoke temperature, smoke humidity, and dust concentration in the smoke.

7. The spray gun dust accumulation prevention device according to claim 6, characterized in that: The detection mechanism (40) comprises a dust concentration sensor (41); The side wall of the tube body (31) is provided with a first detection port (33), the dust concentration sensor (41) is arranged at the first detection port (33), and the detection end of the dust concentration sensor (41) extends into the tube body (31).

8. The spray gun dust accumulation prevention device according to claim 7, characterized in that: The detection mechanism (40) also includes a temperature and humidity sensor (42); The side wall of the tube body (31) is provided with a second detection port (34), the temperature and humidity sensor (42) is arranged at the second detection port (34), and the detection end of the temperature and humidity sensor (42) extends into the tube body (31).

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