A tube sootblower

Abstract

The application discloses a sleeve soot blower and relates to the technical field of carbon black production. The sleeve soot blower comprises a shell, a plurality of outer pipes and a plurality of inner pipes, each outer pipe is arranged on the shell, each inner pipe is arranged in the outer pipe in correspondence, and a gap is formed between the inner pipe and the outer pipe. Each inner pipe is provided with a plurality of jet pipes penetrating through the outer pipe; an expansion joint is arranged on the outer pipe; a connecting pipe is arranged between the outer pipes, and a flow path is formed between the outer pipes through the connecting pipe. By arranging the expansion joint on the outer pipe, the expansion and contraction amount of the outer pipe can be compensated according to the characteristics of the outer pipe in the high-temperature environment, the thermal expansion difference between the outer pipe and the inner pipe is offset, the problems such as cracking of the outer pipe and tearing of the weld are avoided, the failure rate is significantly reduced, and the service life and operation stability of the sleeve soot blower are improved.

Description

Technical Field

[0001] This invention relates to the field of carbon black production technology, and in particular to a soot blower. Background Technology

[0002] Current shell-and-tube sootblower systems mainly consist of a shell and tube bundles. The shell is lined with an insulation layer and refractory material, while the tube bundles are formed by connecting inner and outer tubes with plugs to create a shell. Several blowpipes inject high-pressure steam into the inner tubes of the air preheater to clean the ash buildup on the inner walls of the heat exchange tubes, thereby improving heat exchange efficiency and preventing dust blockage. Simultaneously, low-pressure steam is used inside the outer tubes to cool both the inner and outer tubes, preventing the outer tubes from burning out when high-temperature carbon black fumes flow through the shell and ensuring the stable operation of the air preheater.

[0003] However, existing sleeve sootblowers mostly use rigid welded fixed structures for their inner and outer tubes. When operating under high-temperature flue gas conditions, the temperature difference between the inner and outer tubes is large, and there is a significant difference in the amount of thermal expansion and contraction. Furthermore, the equipment does not have a dedicated flexible compensation structure, which cannot effectively offset the difference in thermal expansion. This can easily cause the outer tube to crack under the action of thermal expansion, affecting normal use. Summary of the Invention

[0004] To address the problem that the outer tube of the aforementioned sleeve sootblower is prone to cracking under thermal expansion, this invention provides a sleeve sootblower.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A sleeve-type sootblower includes a housing, several outer tubes, and several inner tubes. Each outer tube is disposed on the housing, and each inner tube is correspondingly disposed within an outer tube, with a gap between the inner tubes and the outer tubes. Each inner tube is provided with several injection pipes extending out of the outer tubes. An expansion joint is included, disposed on each outer tube. Connecting pipes are also included, disposed between the outer tubes, forming a flow path between the outer tubes. The outer tubes are divided into a first tube group and a second tube group. In the first tube group, one outer tube has an inlet pipe, and another outer tube has an outlet pipe; the connecting pipe is disposed between adjacent outer tubes. In the second tube group, one outer tube has an inlet pipe, and another outer tube has an outlet pipe; the connecting pipe is disposed between adjacent outer tubes.

[0006] Furthermore, both sides of each of the outer tubes protrude from the outer side of the shell, and one side of each of the outer tubes is the inlet side and the other side is the outlet side, with the expansion joint disposed on the inlet side of the outer tube.

[0007] Furthermore, the connecting pipe is arranged at an angle relative to the outer pipe.

[0008] Furthermore, the shell is tubular, and each of the outer tubes is arranged along the direction of the shell chord.

[0009] Furthermore, flanges are provided on both the upper and lower sides of the shell, refractory material is provided on the inner side wall, several hanging brackets are provided on the outer side wall, and a partition is provided inside the shell, the partition being located below each of the outer tubes.

[0010] Furthermore, the partition plate has several through holes.

[0011] Furthermore, the outer tube is a cylindrical structure closed at one end and has an opening on one side. The inner tube is adapted to be inserted into the outer tube, and the opening of the outer tube is connected to the outer wall of the inner tube.

[0012] The beneficial effects of this invention are as follows: By dividing the outer tubes into a first tube group and a second tube group, and cooling them by introducing low-pressure steam into the first and second tube groups respectively, this invention shortens the flow path of the low-pressure steam and improves the heat exchange effect on the outer and inner tubes. Furthermore, by installing expansion joints on the outer tubes, this invention can compensate for the expansion and contraction of the outer tubes under high-temperature conditions according to its own characteristics, offsetting the thermal expansion difference between the outer and inner tubes, eliminating rigid tensile stress on the outer tube wall and the weld seam between the outer tube opening and the inner tube outer wall, and preventing problems such as cracking of the outer tube and tearing of the weld seam. This significantly reduces the failure rate and improves the service life and operational stability of the casing sootblower. Attached Figure Description

[0013] Figure 1 The diagram shown is a schematic representation of the structural principle of one embodiment of the present invention.

[0014] Figure 2 As shown Figure 1 A side view.

[0015] Figure 3 As shown Figure 1 Top view.

[0016] Figure 4 As shown Figure 3 A cross-sectional view of one side at point A in the middle.

[0017] Figure 5 for Figure 1 The partial structural diagram shows the installation relationship between the outer and inner tubes.

[0018] Figure 6 As shown Figure 5 A cross-sectional view of one side at point B in the middle.

[0019] Explanation of reference numerals in the attached drawings: 1. Shell; 2. Hanging base; 3. Refractory material; 4. Outer tube; 5. Inlet tube; 6. Inner tube; 7. Injection tube; 8. Expansion joint; 9. Connecting tube; 10. Outlet tube; 11. Baffle plate. Detailed Implementation

[0020] This invention discloses a sleeve soot blower. The following describes one embodiment of the invention in detail with reference to the accompanying drawings.

[0021] Combination Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, a casing sootblower includes a shell 1, several outer tubes 4, and several inner tubes 6. The shell 1 is tubular. Flanges are provided on both the upper and lower sides of the shell 1 for detachable connection, facilitating the disassembly and replacement of the outer tubes 4 and inner tubes 6, and for soot cleaning. Refractory material 3 is provided on the inner wall of the shell 1 to insulate against the high temperature brought by carbon black flue gas inside the shell 1, significantly reducing the temperature of the outer wall of the shell 1 and extending its service life. Several lifting seats 2 are provided on the outer wall of the shell 1, providing connection positions for hoisting the entire machine and reducing installation difficulty. A partition 11 is provided inside the shell 1, with several through holes. The outer tubes 4 are arranged in the same direction along the chord of the shell 1, and both sides of each outer tube 4 protrude from the outer side of the shell 1. The portion of each outer tube 4 located on the left side of the shell 1 is the inlet side, and the portion located on the right side of the shell 1 is the outlet side. An expansion joint 8 is provided on the inlet side of each outer tube 4.

[0022] Combination Figure 5 and Figure 6As shown, each outer tube 4 is a cylindrical structure closed at one end and has an opening on one side. Each inner tube 6 is inserted into the outer tube 4 through the opening, and the opening of the outer tube 4 is connected to the outer wall of the inner tube 6 to form a seal, preventing the leakage of low-pressure steam entering the outer tube 4. There is a gap between the outer wall of the inner tube 6 and the inner wall of the outer tube 4, which allows low-pressure steam to flow through and exchange heat with the walls of the outer tube 4 and the inner tube 6. Each inner tube 6 is connected to several injection pipes 7 that extend out of the outer tube 4, and the injection pipes 7 are used to eject high-pressure steam. Each outer tube 4 is divided into a first tube group and a second tube group, and each of the first tube group and the second tube group contains at least one outer tube 4. In the first tube group, the outer tube 4 located on the outer side is provided with an inlet pipe 5, and the outer tube 4 located on the inner side is provided with an outlet pipe. Connecting pipes 9 are provided between adjacent outer tubes 4. Each connecting pipe 9 is arranged at an angle relative to the outer tube 4, and the outer tubes 4 are connected through the connecting pipes 9. In the second pipe group, an inlet pipe 5 is provided on the outer pipe 4 located on the outer side, and an outlet pipe 10 is provided on the outer pipe 4 located on the inner side. A connecting pipe 9 is provided between adjacent outer pipes 4. Each connecting pipe 9 is arranged at an angle relative to the outer pipe 4, and a connecting path is formed between each outer pipe 4 through the connecting pipe 9.

[0023] In operation, after installing the soot blower on the air preheater, high-pressure steam is introduced into the inner tube 6. The high-pressure steam is then ejected from the injection pipe 7 into the heat exchange tubes to clean the soot deposits on the inner walls of the heat exchange tubes, improving the heat exchange efficiency and preventing tube blockage. Simultaneously with the introduction of high-pressure steam into the inner tube 6, low-pressure steam is introduced into the outer tube 4 through the inlet pipe 5. The low-pressure steam flows through the gap between the outer tube 4 and the inner tube 6, simultaneously cooling both tubes to ensure that the outer tube 4 is not burned when high-temperature flue gas passes through the inner tube 6. The low-pressure steam circulates through the connecting pipe 9 in each outer tube 4, exchanging heat between the outer tube 4 and inner tube 6 walls, and finally exits from the outlet pipe 10 of the outer tube 4.

[0024] When the equipment operates at high temperature after being supplied with carbon black flue gas, the inner tube 6 experiences relatively small deformation due to the presence of high-pressure steam at room temperature within it. However, the outer tube 4, being in direct contact with the high-temperature carbon black flue gas, is prone to significant thermal expansion deformation, resulting in an expansion difference between the outer tube 4 and the inner tube 6. An expansion joint 8 is installed on the inlet side of the outer tube 4. This joint automatically adjusts its tensile and compressive deformation to absorb the thermal expansion excess of the outer tube 4, offsetting the expansion difference between the outer tube 4 and the inner tube 6. This eliminates the rigid tensile stress on the outer tube 4 wall and the weld between the outer tube 4 opening and the inner tube 6, preventing cracking of the outer tube 4 and tearing of the weld between the outer tube 4 opening and the inner tube 6. This improves operational stability and extends service life.

[0025] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A sleeve-type soot blower, characterized in that: The device includes a housing (1), several outer tubes (4), and several inner tubes (6). Each outer tube (4) is disposed on the housing (1), and each inner tube (6) is disposed inside the outer tube (4), with a gap between the inner tube (6) and the outer tube (4). Each inner tube (6) is provided with several injection pipes (7) that extend out of the outer tube (4). The device also includes an expansion joint (8) disposed on the outer tube (4). Furthermore, the device includes a connecting pipe (9) disposed between the outer tubes (4), and a flow path is formed between the outer tubes (4) through the connecting pipe (9). Each of the outer tubes (4) is divided into a first tube group and a second tube group. In the first tube group, an inlet tube (5) is provided on one of the outer tubes (4) and an outlet tube (10) is provided on the other outer tube (4). The connecting tube (9) is provided between adjacent outer tubes (4). In the second pipe group, an inlet pipe (5) is provided on one of the outer pipes (4), an outlet pipe (10) is provided on the other outer pipe (4), and the connecting pipe (9) is provided between adjacent outer pipes (4).

2. The sleeve soot blower according to claim 1, characterized in that: Both sides of each of the outer tubes (4) protrude from the outside of the housing (1), and one side of each of the outer tubes (4) is the inlet side and the other side is the outlet side. The expansion joint (8) is disposed on the inlet side of the outer tube (4).

3. The sleeve soot blower according to claim 1, characterized in that: The connecting pipe (9) is arranged at an angle relative to the outer pipe (4).

4. The sleeve soot blower according to claim 1, characterized in that: The shell (1) is tubular, and each of the outer tubes (4) is arranged along the chord of the shell (1).

5. The sleeve soot blower according to claim 1 or 4, characterized in that: Flanges are provided on both the upper and lower sides of the shell (1), refractory material (3) is provided on the inner side wall, several hangers (2) are provided on the outer side wall, and a partition (11) is provided inside the shell (1), the partition (11) being located below each of the outer tubes (4).

6. The sleeve soot blower according to claim 5, characterized in that: The partition (11) has several through holes.

7. The sleeve soot blower according to claim 1, characterized in that: The outer tube (4) is a cylindrical structure with one end closed and one side open. The inner tube (6) is adapted to be inserted into the outer tube (4), and the opening of the outer tube (4) is connected to the outer wall of the inner tube (6).

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