Protection device for energy-saving denitration spray gun of W flame coal-fired boiler

Abstract

The utility model discloses a protection device for an energy-saving denitration spray gun of a W flame coal-fired boiler, and relates to the technical field of spray gun protection equipment. The water cooling wall is mounted on the outer side of the mounting sleeve, and the water cooling wall is used for normal water cooling treatment; the cooling device has the advantages that when the mounting sleeve is arranged, the clasp nail and the cooling air connector are used, flowing air passes through the mounting sleeve to serve as a cooling air source, and the cooling air source is supplied to a boiler primary air fan or an additionally-arranged small-sized air fan; the cooling air is fed into a gap between the atomizing spray gun and the mounting sleeve through a cooling air interface of the mounting sleeve, refractory castable needs to be filled around the mounting sleeve, the part, extending into the water cooling wall, of the castable serves as the center and is filled into a boss in a spherical surface mode, and the surface of the castable in the formwork needs to be flat and smooth; and the depth size and angle can be adjusted according to the position and direction of the atomizing spray gun and then the atomizing spray gun is fixed, so that the device has universality and can be matched with boilers in most regions for use.

Description

Technical Field

[0001] The utility model relates to the technical field of spray gun protection equipment, in particular to a protection device for an energy-saving denitration spray gun of a W-flame coal-fired boiler. Background Art

[0002] At present, SNCR is a common flue gas denitrification method for coal-fired boilers, and urea solution is a conventional reducing agent for SNCR. This denitrification method is widely used in industries such as denitrification in coal-fired power plants.

[0003] The W-flame boiler is a type of furnace designed for stable combustion of low-volatile coal. With its special combustion organization and high furnace volume heat load, it has become the main furnace type for burning difficult-to-burn coal in my country. However, due to the high combustion temperature level in the W-flame boiler (200-400℃ higher than other types of pulverized coal furnaces) and the low volatile content of the coal used, the NOx generation is extremely high (800-2000mg / m3), and NOx emissions face huge challenges.

[0004] The existing technology has the following problems: the current SNCR system spray gun is installed and fixed on the boiler water-cooled wall panel, and the front end of the spray gun is easily worn due to contact with high-temperature and high-dust flue gas. When the urea solution is atomized and sprayed, part of the urea solution flows down along the water-cooled wall, causing corrosion to the water-cooled wall panel and water-cooled pipes, and even causing the risk of pipe bursting. At the same time, the cooling air source of the spray gun adopts compressed air cooling, which causes a certain amount of waste compared to the compressed air used in the factory.

[0005] Therefore, it is necessary to design a spray gun sleeve protection device to solve the problems of spray gun front end wear, water cooling wall corrosion and compressed air waste. Utility Model Content

[0006] The utility model aims to provide a protection device for an energy-saving denitrification spray gun of a W-flame coal-fired boiler, so as to solve the problem proposed in the above background technology that the current SNCR system spray gun is installed and fixed on the boiler water-cooled wall plate, the front end of the spray gun is easily worn in contact with high-temperature and high-dust flue gas, and part of the urea solution flows down along the water-cooled wall when atomizing and spraying the urea solution, causing corrosion to the water-cooled wall plate and the water-cooled pipe, and even causing the risk of pipe bursting, and at the same time, the cooling air source of the spray gun adopts compressed air cooling, which causes a certain amount of waste compared with the compressed air used in the factory.

[0007] To achieve the above purpose, the utility model provides the following technical solution: a protective device for an energy-saving denitrification spray gun of a W-flame coal-fired boiler, comprising:

[0008] Install the casing;

[0009] Water-cooled wall: The water-cooled wall is installed on the outside of the mounting sleeve and is used for normal water cooling;

[0010] Sealing box: The sealing box is installed inside the water-cooled wall and outside the mounting sleeve. The sealing box is used for internal sealing to facilitate temperature control.

[0011] Let the pipe be installed inside the sealing box and both ends of the pipe extend to the inside of the water-cooled wall. The pipe is used for pipe connection and installation;

[0012] Circular boss: The circular boss is installed on the outside of the pipe. The circular boss is used to assist in the installation of the sleeve.

[0013] Cooling air interface: The cooling air interface is installed above the mounting sleeve and away from the side of the water-cooled wall. The cooling air interface is used for cooling air access processing.

[0014] The technical effect of adopting the above further scheme is: flowing air passes through the installation sleeve as a cooling air source, and the cooling air source is supplied by the boiler primary fan or an additional small fan, and is sent into the gap between the atomizing spray gun and the installation sleeve through the cooling air interface of the installation sleeve, so as to avoid waste caused by direct use of compressed air. The denitrification spray gun protection device is fixedly connected to the boiler water-cooled wall after adjustment according to the design position and direction of the denitrification spray gun. The boiler water-cooled wall is treated with pipe clearance before installation to facilitate the installation of the denitrification spray gun protection device. After fixation, the outside of the water-cooled wall is sealed with a sealing box, and refractory castables are filled after sealing. The inside of the water-cooled wall is also filled with refractory castables. Spikes are installed in the refractory castables. The spikes are fixedly welded to the outer periphery of the denitrification protection device and are arranged in a circle. Before pouring, the spikes should be coated with asphalt or wrapped with a thin plastic film Membrane, the gap space revealed after the ablation of these coatings can ensure that the nails expanded by heat will not damage the castable. The above-mentioned cooperation can prevent the front end of the spray gun from wearing due to contact with high-temperature and high-dust flue gas. At the same time, the original anti-wear sleeve of the spray gun is cancelled, so that the spray gun body can be directly installed in the spray gun installation sleeve, reducing the outer diameter of the installation sleeve, and reducing the difficulty of boiler water-cooled wall and pipe installation and modification. The part of the denitrification spray gun protection device extending into the boiler water-cooled wall needs to be filled with refractory castables around it. The castable is spherically filled into a boss with the part extending into the water-cooled wall as the center. The surface of the castable in the template should be flat and smooth. The overall structure is simple and easy to operate. The depth size and angle can be adjusted according to the position and direction of the atomizing spray gun and then fixed. Therefore, it has universal applicability and can be used with boilers in most areas.

[0015] As a preferred solution of the utility model: a small fan is installed on one side of the cooling air interface, the output end of the small fan is connected to the cooling air interface through a connecting pipe, and the small fan is used to transport the required cooling air to the inside of the cooling air interface.

[0016] The technical effect of adopting the above further solution is: the small fan is used to transport the required cooling air to the inside of the cooling air interface, and the small fan can also be used as the boiler primary fan to provide the required cooling air.

[0017] As a preferred solution of the utility model: the inside of the circular boss is installed with metal spikes which are distributed in a circumferential manner and extend to the inside of the installation sleeve, and the metal spikes are used to reinforce the connection between the installation sleeve and the circular boss.

[0018] The technical effect of adopting the above further solution is: the metal nails are used to reinforce the connection between the installation sleeve and the circular boss.

[0019] As a preferred solution of the utility model: the circular boss is a boss made of refractory casting material, which is used to extend the service life of the equipment.

[0020] The technical effect of adopting the above further solution is: the service life of the circular boss equipment is extended by combining the above materials.

[0021] As a preferred solution of the utility model: a valve is fixedly connected to the outer side of the cooling air interface, and the valve is used to adjust the opening and closing state of the cooling air interface.

[0022] The technical effect of adopting the above further solution is: the valve is used to adjust the opening and closing status of the cooling air interface.

[0023] As a preferred solution of the utility model: the outer side of the circular boss is coated with a wooden template waterproof paint to extend the service life of the equipment.

[0024] The technical effect of adopting the above further solution is: the service life of the circular boss equipment is extended by combining the above materials.

[0025] As a preferred solution of the utility model: the outer side of the metal spike is coated with a wrapping plastic film, and the wrapping plastic film is used to prevent the front end of the spray gun from being worn due to contact with high-temperature and high-dust smoke.

[0026] The technical effect of adopting the above further solution is: the above-mentioned matching winding plastic film is used to prevent the front end of the spray gun from being worn due to contact with high-temperature and high-dust smoke.

[0027] As a preferred solution of the utility model: a spray gun head is installed on the side of the installation sleeve away from the sealing box, and two access pipes are installed on one side of the spray gun head, and the access pipes are used to connect the spray gun head to normal operation.

[0028] The technical effect of adopting the above further scheme is: through the access pipeline for normal access operation to the spray gun head, the spray gun body can be directly installed in the installation sleeve, the outer diameter of the installation sleeve is reduced, and the difficulty of boiler water-cooled wall and pipe installation and modification is reduced.

[0029] Compared with the prior art, the utility model has the following beneficial effects: when the installation sleeve, the nails and the cooling air interface are provided, flowing air passes through the installation sleeve as a cooling air source, and the cooling air source is supplied by the boiler's primary fan or an additional small fan, and is sent into the gap between the atomizing spray gun and the installation sleeve through the cooling air interface of the installation sleeve, so as to avoid waste caused by direct use of compressed air. The denitrification spray gun protection device is fixedly connected to the boiler water-cooled wall after adjustment according to the design position and direction of the denitrification spray gun. The boiler water-cooled wall is pipe-free before installation to facilitate the installation of the denitrification spray gun protection device. After fixation, the outside of the water-cooled wall is sealed with a sealing box, and refractory castables are filled after sealing. The inside of the water-cooled wall is also filled with refractory castables. Nails are installed in the refractory castables, and the nails are fixedly welded to the outer periphery of the denitrification protection device in a circular arrangement. Before pouring The spikes should be coated with asphalt or wrapped with plastic film. The gap space revealed after the coating is burned can ensure that the spikes that expand due to heat will not damage the castable. The above-mentioned cooperation can prevent the front end of the spray gun from wearing due to contact with high-temperature and high-dust flue gas. At the same time, the original anti-wear sleeve of the spray gun is cancelled, so that the spray gun body can be directly installed in the spray gun installation sleeve, which reduces the outer diameter of the installation sleeve and reduces the difficulty of boiler water-cooled wall and pipe installation and modification. The part of the denitrification spray gun protection device that extends into the boiler water-cooled wall needs to be filled with refractory castables around it. The castable is spherically filled into a boss with the part extending into the water-cooled wall as the center. The surface of the castable in the template should be flat and smooth. The overall structure is simple and easy to operate. The depth size and angle can be adjusted according to the position and direction of the atomizing spray gun and then fixed. Therefore, it has universal applicability and can be used with boilers in most areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is the overall structure diagram of the spray gun protection device of the utility model;

[0031] Figure 2 It is a schematic diagram of the circular boss structure of the utility model.

[0032] In the figure: 1. Installation sleeve; 2. Round boss; 3. Metal nails; 4. Cooling air interface; 5. Small fan; 6. Water-cooled wall; 7. Sealing box; 8. Let pipe. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] See also Figure 1 and Figure 2 , the utility model provides a technical solution: a protective device for an energy-saving denitrification spray gun of a W-flame coal-fired boiler, comprising a mounting sleeve 1;

[0035] Water-cooled wall 6, the water-cooled wall 6 is installed on the outside of the mounting sleeve 1, and the water-cooled wall 6 is used for normal water cooling;

[0036] The sealing box 7 is installed inside the water-cooled wall 6 and outside the mounting sleeve 1. The sealing box 7 is used for internal sealing to facilitate temperature control;

[0037] Let the pipe 8 be installed inside the sealing box 7 and let both ends of the pipe 8 extend to the inside of the water-cooled wall 6, so that the pipe 8 is used for pipeline connection and installation processing;

[0038] The circular boss 2 is installed on the outer side of the pipe 8, and the circular boss 2 is used to assist in the installation of the sleeve 1;

[0039] The cooling air interface 4 is installed above the mounting sleeve 1 and away from the side of the water-cooled wall 6. The cooling air interface 4 is used for cooling air access processing.

[0040] It can be understood that the above scheme also has a mounting sleeve 1, a nail 3 and a cooling air interface 4. When in use, flowing air passes through the mounting sleeve 1 as a cooling air source. The cooling air source is supplied by the boiler's primary fan or an additional small fan 5. The air is sent into the gap between the atomizing spray gun and the mounting sleeve 1 through the cooling air interface 4 of the mounting sleeve 1 to avoid waste caused by direct use of compressed air. The denitrification spray gun protection device is fixedly connected to the boiler water-cooled wall 6 after adjustment according to the design position and direction of the denitrification spray gun. The boiler water-cooled wall is treated with a pipe 8 before installation to facilitate the installation of the denitrification spray gun protection device. After fixation, the outside of the water-cooled wall 6 is sealed with a sealing box 7, which is then filled with refractory castables. The inside of the water-cooled wall is also filled with refractory castables. The nails 3 are installed in the refractory castables. The nails 3 are fixedly welded to the outer periphery of the denitrification protection device 1 and are arranged in a circle. Previously, the spikes 3 should be coated with asphalt or wrapped with plastic film. The gap space revealed after the coating is burned can ensure that the spikes 3 that expand due to heat will not damage the castable. The above-mentioned cooperation can prevent the front end of the spray gun from being worn due to contact with high-temperature and high-dust flue gas. At the same time, the original anti-wear sleeve of the spray gun is cancelled, so that the spray gun body can be directly installed in the spray gun installation sleeve 1, reducing the outer diameter of the installation sleeve 1, and reducing the difficulty of installation and modification of the boiler water-cooled wall 6 and the pipe 8. The part of the denitrification spray gun protection device that extends into the boiler water-cooled wall 6 needs to be filled with refractory castables around it. The castable is spherically filled into a boss 2 with the part extending into the water-cooled wall 6 as the center. The surface of the castable in the template should be flat and smooth, and the overall structure is simple and easy to operate. The depth size and angle can be adjusted according to the position and direction of the atomizing spray gun and then fixed. Therefore, it has universal applicability and can be used with boilers in most areas.

[0041] See also Figure 1 and Figure 2 A small fan 5 is installed on one side of the cooling air interface 4, and the output end of the small fan 5 is connected to the cooling air interface 4 through a connecting pipe.

[0042] It is understandable that in the above solution, a small fan 5 is used to deliver the required cooling air to the inside of the cooling air interface 4, and the small fan 5 can also be a primary fan of the boiler to provide the required cooling air.

[0043] See also Figure 1 and Figure 2 The circular boss 2 is internally installed with metal spikes 3 which are distributed in a circumferential manner and extend to the interior of the installation sleeve 1 .

[0044] It is understandable that in the above solution, metal nails 3 are used to reinforce the connection between the installation sleeve 1 and the circular boss 2 .

[0045] See also Figure 1 and Figure 2, the circular boss 2 is a boss made of refractory casting material, which is used to extend the service life of the equipment;

[0046] The outer side of the circular boss 2 is coated with a wooden template and waterproof paint to extend the service life of the equipment.

[0047] It is understandable that the above solution also exists in that the service life of the circular boss 2 equipment is extended by combining the above materials.

[0048] See also Figure 1 A valve is fixedly connected to the outside of the cooling air interface 4.

[0049] It is understandable that in the above solution, a valve is also used to adjust the opening and closing states of the cooling air interface 4 .

[0050] See also Figure 1 and Figure 2 The outer side of the metal nail 3 is coated with a winding plastic film, and the gap space revealed after the coating is ablated can ensure that the metal nail 3 that expands due to heat will not damage the casting material.

[0051] It is understandable that the above solution also includes the above-mentioned matching wrapping plastic film to prevent the front end of the spray gun from being worn due to contact with high-temperature and high-dust smoke.

[0052] See also Figure 1 and Figure 2 A spray gun head is installed on one side of the installation sleeve 1 away from the sealing box 7, and two access pipes are installed on one side of the spray gun head.

[0053] It is understandable that the above scheme also has an access pipeline for normal access operation to the spray gun head, so that the spray gun body is directly installed in the installation sleeve 1, which reduces the outer diameter of the installation sleeve 1 and reduces the difficulty of installation and modification of the boiler water-cooled wall 6 and the pipe 8.

[0054] See also Figure 1 and Figure 2The working principle of the new type used in the present invention is as follows: flowing air passes through the installation sleeve 1 as a cooling air source, and the cooling air source is supplied by the boiler primary fan or an additional small fan 5, and is sent into the gap between the atomizing spray gun and the installation sleeve 1 through the cooling air interface 4 of the installation sleeve 1, so as to avoid waste caused by direct use of compressed air. The denitrification spray gun protection device is fixedly connected to the boiler water-cooled wall 6 after adjustment according to the design position and direction of the denitrification spray gun. The boiler water-cooled wall is treated with a pipe 8 before installation to facilitate the installation of the denitrification spray gun protection device. After fixation, the outside of the water-cooled wall 6 is sealed with a sealing box 7, and refractory castables are filled after sealing. The inside of the water-cooled wall is also filled with refractory castables. Rack nails 3 are installed in the refractory castable, and the rack nails 3 are fixedly welded to the outer periphery of the denitrification protection device 1 and arranged in a circle. Before pouring, the rack nails 3 should be coated with asphalt or wrapped with plastic The film, the gap space presented after the ablation of these coatings can ensure that the heat-expanded nails 3 will not damage the castable. The above-mentioned cooperation can prevent the front end of the spray gun from being worn due to contact with high-temperature and high-dust flue gas. At the same time, the original anti-wear sleeve of the spray gun is cancelled, so that the spray gun body can be directly installed in the spray gun installation sleeve 1, reducing the outer diameter of the installation sleeve 1, and reducing the difficulty of installation and modification of the boiler water-cooled wall 6 and the pipe 8. The part of the denitrification spray gun protection device extending into the boiler water-cooled wall 6 needs to be filled with refractory castables around it. The castable is spherically filled into a boss 2 with the part extending into the water-cooled wall 6 as the center. The surface of the castable in the template should be flat and smooth, and the overall structure is simple and easy to operate. The depth size and angle can be adjusted according to the position and direction of the atomizing spray gun and then fixed. Therefore, it has universal applicability and can be used with boilers in most areas.

[0055] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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 should not be understood as a limitation on the present invention.

[0056] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0057] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A protective device for an energy-saving denitrification spray gun for a W-flame coal-fired boiler, characterized in that: include: Installing the casing (1); A water-cooled wall (6), the water-cooled wall (6) being installed on the outside of the installation sleeve (1), the water-cooled wall (6) being used for normal water cooling treatment; A sealing box (7), the sealing box (7) being installed inside the water-cooled wall (6) and located outside the mounting sleeve (1), the sealing box (7) being used for internal sealing to facilitate temperature control; A letting pipe (8), the letting pipe (8) is installed inside the sealing box (7) and both ends of the letting pipe (8) extend into the inside of the water-cooled wall (6), and the letting pipe (8) is used for pipeline connection installation processing; A circular boss (2), the circular boss (2) being mounted on the outer side of the guide tube (8), the circular boss (2) being used to assist the installation sleeve (1) in limiting the installation; A cooling air interface (4), the cooling air interface (4) being installed above the installation sleeve (1) and on a side away from the water-cooled wall (6), the cooling air interface (4) being used for cooling air access processing.

2. The protective device for the energy-saving denitrification spray gun of a W-flame coal-fired boiler according to claim 1 is characterized in that: A small fan (5) is installed on one side of the cooling air interface (4); the output end of the small fan (5) is connected to the cooling air interface (4) via a connecting pipe; the small fan (5) is used to transport required cooling air to the interior of the cooling air interface (4).

3. The protective device for the energy-saving denitrification spray gun of a W-flame coal-fired boiler according to claim 1 is characterized in that: The circular boss (2) is internally provided with metal nails (3) which are distributed in a circumferential arrangement and extend into the interior of the installation sleeve (1). The metal nails (3) are used to reinforce the connection between the installation sleeve (1) and the circular boss (2).

4. The protective device for the energy-saving denitrification spray gun of a W-flame coal-fired boiler according to claim 1 is characterized in that: The circular boss (2) is a boss made of refractory casting material and is used to extend the service life of the equipment.

5. The protective device for the energy-saving denitrification spray gun of a W-flame coal-fired boiler according to claim 1 is characterized in that: The outer side of the cooling air interface (4) is fixedly connected with a valve, and the valve is used to adjust the opening and closing state of the cooling air interface (4).

6. The protective device for the energy-saving denitrification spray gun of a W-flame coal-fired boiler according to claim 1 is characterized in that: The outer side of the circular boss (2) is coated with a wooden template waterproof paint to extend the service life of the equipment.

7. The protective device for the energy-saving denitrification spray gun of a W-flame coal-fired boiler according to claim 3 is characterized in that: The outer side of the metal spike (3) is coated with a wrapping plastic film, and the wrapping plastic film is used to prevent the front end of the spray gun from being worn due to contact with high-temperature and high-dust smoke.

8. The protective device for the energy-saving denitrification spray gun of a W-flame coal-fired boiler according to claim 1 is characterized in that: A spray gun head is installed on the side of the installation sleeve (1) away from the sealing box (7), and two access pipes are installed on one side of the spray gun head. The access pipes are used to connect the spray gun head to normal operation.

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