Pulverized coal spray gun

Abstract

The utility model relates to the technical field of combustion equipment, in particular to a pulverized coal spray gun which comprises an external thread connector, an elbow marble valve and a premixing powder spraying assembly, the right side of the surface of the external thread connector is in threaded connection with a ball valve, and a conveying pipe is installed in the elbow marble valve in a penetrating mode. An expansion pipe is communicated between the right end of the conveying pipe and the premixing powder spraying assembly, a stainless steel shell is fixedly embedded in the inner wall of the expansion pipe, a ceramic lining is fixedly installed on the inner ring of the stainless steel shell, the premixing powder spraying assembly comprises a premixing chamber, and a powder inlet pipe and a gas conveying pipe are installed at the top of an inner cavity of the premixing chamber. By arranging the premixing powder spraying assembly, the stainless steel shell and the ceramic lining, the ceramic lining can be installed in the stainless steel shell, by means of the characteristics of high temperature resistance, corrosion resistance and abrasion resistance of the ceramic lining, the high-temperature and high-pressure environment generated by pulverized coal combustion can be well borne, and the stability and durability of the whole structure are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of combustion equipment, in particular to a coal powder spray gun. Background Art

[0002] In thermal power generation, industrial boilers, metallurgy and other fields, pulverized coal is widely used as an important energy material. The pulverized coal spray gun is a key component of the pulverized coal combustion system, and its performance directly affects the combustion efficiency, flame stability and service life of the equipment.

[0003] Traditional pulverized coal spray guns are mostly made of a single metal material, which has problems such as insufficient high temperature resistance, easy wear and poor corrosion resistance. Especially under high temperature, high pressure and erosion of pulverized coal particles, it is easy to cause the spray gun to deform, clog or even be damaged, affecting production efficiency and safety. In order to solve the above technical problems, we designed a pulverized coal spray gun. Utility Model Content

[0004] The purpose of the utility model is to provide a coal powder spray gun with the advantage of safety protection, which solves the problem that traditional coal powder spray guns are mostly made of a single metal material, have insufficient high temperature resistance, easy wear and poor corrosion resistance, especially under high temperature and high pressure and coal powder particle scouring, which can easily cause the spray gun to deform, clog or even be damaged, affecting production efficiency and safety.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a coal powder spray gun, comprising an external threaded joint, an elbow ball valve and a premixed powder spray assembly, the right side of the surface of the external threaded joint is threadedly connected to a ball valve, a transmission pipe is installed through the interior of the elbow ball valve, an extension pipe is connected between the right end of the transmission pipe and the premixed powder spray assembly, the inner wall of the extension pipe is fixedly inlaid with a stainless steel shell, the inner ring of the stainless steel shell is fixedly installed with a ceramic lining, the premixed powder spray assembly includes a premixing chamber, the top of the inner cavity of the premixing chamber is respectively installed with a powder inlet pipe and an air pipe, and the surface of the air pipe is penetrated by air holes.

[0006] Preferably, the powder inlet pipe and the air delivery pipe are both connected to the inner cavity of the premixing chamber, a frustum block is fixedly connected to the left side of the inner cavity of the premixing chamber, and the right end of the premixing chamber is connected to the inner cavity of the external threaded joint.

[0007] Preferably, the left end of the transmission pipe passes through the elbow ball valve and extends into the ball valve, and the left side of the surface of the transmission pipe is threadedly connected to the inner wall of the ball valve.

[0008] Preferably, a fastening nut is provided on the threaded sleeve on the left side of the surface of the transmission pipe and on the right side of the ball valve, and the left side of the fastening nut is in close contact with the right side of the ball valve.

[0009] Preferably, a ferrule is sleeved and installed on the left side of the surface of the elbow ball valve, and a sealing ring is installed on the inner wall of the ferrule and at the connection between the ferrule and the elbow ball valve.

[0010] Preferably, a protective sleeve is provided on the right side of the elbow ball valve, and flanges are fixedly provided on the right end of the elbow ball valve and the left end of the protective sleeve, and a connecting piece is installed through the surface of the flange.

[0011] Preferably, a fastening bolt is threadedly connected through the left side of the surface of the elbow ball valve, and one end of the fastening bolt is in close contact with the surface of the transmission pipe.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] The utility model has the advantage of safety protection by arranging a premixed powder spraying component, a stainless steel shell and a ceramic lining. The ceramic lining can be installed in the stainless steel shell. The high temperature resistance, corrosion resistance and wear resistance of the ceramic lining are utilized, and the utility model is well suitable for withstanding the high temperature and high pressure environment generated by coal powder combustion, thereby ensuring the stability and durability of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic cross-sectional view of the premixed powder spraying component of the utility model.

[0016] In the figure: 1. External threaded connector; 2. Elbow ball valve; 3. Ball valve; 4. Fastening nut; 5. Sealing ring; 6. Transmission pipe; 7. Ferrule; 8. Fastening bolt; 9. Flange; 10. Connector; 11. Extension pipe; 12. Premix powder spraying assembly; 1201. Powder inlet pipe; 1202. Premix chamber; 1203. Cone block; 1204. Air vent; 1205. Air transmission pipe; 13. Protective cover; 14. Stainless steel shell; 15. Ceramic lining. DETAILED DESCRIPTION

[0017] See also Figure 1-Figure 2The pulverized coal spray gun includes an external threaded joint 1, an elbow ball valve 2 and a premixed powder spraying assembly 12. By setting the elbow ball valve 2, the flow of pulverized coal can be controlled and the leakage of high-temperature gas can be prevented. It is well suitable for blast furnace coal injection system. The right side of the surface of the external threaded joint 1 is threadedly connected with a ball valve 3. By setting the ball valve 3, the pulverized coal transmission demand can be met in the open state. A transmission pipe 6 is installed through the interior of the elbow ball valve 2. An extension pipe 11 is connected between the right end of the transmission pipe 6 and the premixed powder spraying assembly 12. By setting the extension pipe 11, it can be installed in the installed state. , increasing the coal powder transmission path, better meeting the various needs of users, the inner wall of the extension tube 11 is fixedly inlaid with a stainless steel shell 14, the inner ring of the stainless steel shell 14 is fixedly installed with a ceramic lining 15, the premixed powder injection assembly 12 includes a premixing chamber 1202, the top of the inner cavity of the premixing chamber 1202 is respectively installed with a powder inlet pipe 1201 and an air pipe 1205, and the surface of the air pipe 1205 is penetrated by a ventilation hole 1204. By setting the ventilation hole 1204, the gas can be diverted and diffused into the coal powder in the premixing chamber 1202 to achieve the purpose of premixing treatment;

[0018] See also Figure 1 and Figure 2 The powder inlet pipe 1201 and the gas delivery pipe 1205 are both connected to the inner cavity of the premixing chamber 1202. A frustum block 1203 is fixedly connected to the left side of the inner cavity of the premixing chamber 1202. The frustum block 1203 can play an auxiliary blocking role and is used to increase the contact time between the coal powder and the gas in the premixing chamber 1202. The right end of the premixing chamber 1202 is connected to the inner cavity of the external threaded joint 1;

[0019] See also Figure 1 , the left end of the transmission pipe 6 passes through the elbow ball valve 2 and extends into the ball valve 3, and the left side of the surface of the transmission pipe 6 is threadedly connected to the inner wall of the ball valve 3;

[0020] See also Figure 1 , a fastening nut 4 is provided on the left side of the surface of the transmission pipe 6 and on the right side of the ball valve 3. The left side of the fastening nut 4 is in close contact with the right side of the ball valve 3. By providing the fastening nut 4, the threaded sleeve can be set on the transmission pipe 6 and in close contact with the right end of the ball valve 3, which can help improve the installation stability between the ball valve 3 and the transmission pipe 6;

[0021] See also Figure 1 A ferrule 7 is sleeved on the left side of the surface of the elbow ball valve 2, and a sealing ring 5 is installed on the inner wall of the ferrule 7 and at the connection with the elbow ball valve 2. By providing the sealing ring 5 and the ferrule 7, the connection between the elbow ball valve 2 and the transmission pipe 6 can be sealed and protected;

[0022] See also Figure 1A protective sleeve 13 is provided on the right side of the elbow ball valve 2. A flange 9 is fixedly provided on the right end of the elbow ball valve 2 and the left end of the protective sleeve 13. A connecting piece 10 is installed on the surface of the flange 9. By providing the flange 9 and the connecting piece 10, the elbow ball valve 2 can be connected to the protective sleeve 13, and then the transmission pipe 6 is covered and protected by the protective sleeve 13;

[0023] See also Figure 1 The left side of the surface of the elbow ball valve 2 is threadedly connected with a fastening bolt 8, one end of which is in close contact with the surface of the transmission pipe 6. By providing the fastening bolt 8, the transmission pipe 6 can be locked and installed to prevent the transmission pipe 6 from being displaced at will and detached from the elbow ball valve 2;

[0024] The connecting member 10 includes a positioning bolt and a positioning nut. The positioning bolt passes through the through hole on the flange 9, and the positioning nut is sleeved and installed on the positioning bolt.

[0025] The ceramic lining 15 is made of high-purity alumina ceramic or silicon oxide ceramic, which has extremely high temperature resistance (can withstand temperatures exceeding 1500°C), excellent wear resistance and chemical stability, and can effectively resist the erosion of coal powder particles and the corrosion of high-temperature fuel gas;

[0026] In actual application, the stainless steel shell 14 and the ceramic lining 15 are of tapered design, which increases the coal powder injection speed and flame concentration, optimizes the combustion effect, and at the same time, the internal flow channel of the equipment is smooth, reduces resistance, and improves the coal powder transportation efficiency.

[0027] During use, all components are in the initial installation state. Air is introduced into the premixing chamber 1202 through the air supply pipe 1205, and coal powder is introduced into the premixing chamber 1202 through the powder inlet pipe 1201. As the gas is introduced, the air vents 1204 branch and discharge the air into the coal powder to achieve the purpose of premixing. With the assistance of the frustum block 1203, the mixing time of the gas and coal powder is increased, and finally the coal powder is transmitted from left to right. After opening the ball valve 3, the coal powder is introduced into the combustion chamber through the external threaded joint 1, the ball valve 3, the transmission pipe 6, the extension pipe 11 and the ceramic lining 15, among which the ceramic lining 15 plays the role of inner layer protection.

[0028] In summary, the pulverized coal spray gun, by providing a premixed powder spray assembly 12, a stainless steel shell 14 and a ceramic lining 15, solves the problem that traditional pulverized coal spray guns are mostly made of a single metal material, have insufficient high temperature resistance, easy wear and poor corrosion resistance, especially under high temperature and high pressure and erosion of pulverized coal particles, which can easily cause the spray gun to deform, clog or even be damaged, affecting production efficiency and safety.

Claims

1. A coal powder spray gun comprising an external threaded joint (1), an elbow ball valve (2) and a premixed powder spray assembly (12), characterized in that: The right side of the surface of the external threaded joint (1) is threadedly connected to a ball valve (3), the interior of the elbow ball valve (2) is penetrated by a transmission pipe (6), the right end of the transmission pipe (6) is connected to the premixed powder spraying assembly (12) by an extension pipe (11), the inner wall of the extension pipe (11) is fixedly inlaid with a stainless steel shell (14), the inner ring of the stainless steel shell (14) is fixedly installed with a ceramic lining (15), the premixed powder spraying assembly (12) includes a premixing chamber (1202), the top of the inner cavity of the premixing chamber (1202) is respectively installed with a powder inlet pipe (1201) and an air supply pipe (1205), and the surface of the air supply pipe (1205) is penetrated by an air vent (1204).

2. The pulverized coal spray gun according to claim 1, characterized in that: The powder inlet pipe (1201) and the air delivery pipe (1205) are both connected to the inner cavity of the premixing chamber (1202); a frustum block (1203) is fixedly connected to the left side of the inner cavity of the premixing chamber (1202); and the right end of the premixing chamber (1202) is connected to the inner cavity of the external threaded joint (1).

3. The pulverized coal spray gun according to claim 1, characterized in that: The left end of the transmission pipe (6) passes through the elbow ball valve (2) and extends into the ball valve (3), and the left side of the surface of the transmission pipe (6) is threadedly connected to the inner wall of the ball valve (3).

4. The pulverized coal spray gun according to claim 1, characterized in that: A fastening nut (4) is provided on the left side of the surface of the transmission pipe (6) and on the right side of the ball valve (3). The left side of the fastening nut (4) is in close contact with the right side of the ball valve (3).

5. The pulverized coal spray gun according to claim 1, characterized in that: A ferrule (7) is sleeved and installed on the left side of the surface of the elbow ball valve (2), and a sealing ring (5) is installed on the inner wall of the ferrule (7) and at the connection between the ferrule (7) and the elbow ball valve (2).

6. The pulverized coal spray gun according to claim 1, characterized in that: A protective sleeve (13) is provided on the right side of the elbow ball valve (2), and flanges (9) are fixedly provided on the right end of the elbow ball valve (2) and the left end of the protective sleeve (13), and a connecting piece (10) is installed through the surface of the flange (9).

7. The pulverized coal spray gun according to claim 1, characterized in that: A fastening bolt (8) is threadedly connected through the left side of the surface of the elbow ball valve (2), and one end of the fastening bolt (8) is in close contact with the surface of the transmission pipe (6).

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