Feed distribution pipe and nozzle for petrochemical industry

Abstract

The utility model discloses a petrochemical feed distribution pipe and nozzle, which comprises a central pipe, four main pipes are uniformly distributed in the circumferential direction of the central pipe, a support pipe is arranged at the bottom of the central pipe, an upper branch pipe layer and a lower branch pipe layer are arranged on the main pipes, a plurality of nozzle components are respectively arranged on the upper branch pipe layer and the lower branch pipe layer, and a through jet channel is arranged in a nozzle body. The spraying channel comprises a first cylindrical channel, a conical channel and a second cylindrical channel, and the nozzle body is arranged to be a high-abrasion-resistance alloy cobalt, tungsten and chromium nozzle. The nozzle is reasonable in structural design, the high-wear-resistance alloy nozzle is adopted, the wear resistance is high, and the nozzle is not prone to coking, blocking and abrasion; through the design of the proper cylindrical channel nozzle hole area and the conical channel, the diffusion speed of gas is increased, the fluidization efficiency is high, and the product yield is increased; double-layer branch pipe distribution is adopted, diffusion distribution is uniform, normal fluidization of a catalyst in the regenerator is guaranteed, and the catalyst and petroleum cracking are prevented from coking around the nozzle.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical industry, in particular to a feed distribution pipe and a nozzle for petrochemical industry. Background Art

[0002] Catalytic cracking in the petrochemical industry is a process of fluidized catalyst reaction. The catalyst is essentially a high-hardness ceramic particle, and at the same time it is in a fluidized state, so there must be wear problems, especially in high-velocity parts (such as large-hole distribution plates, main air distribution pipes, various nozzles, etc.). The distribution pipes of the existing technology have low fluidization efficiency during actual use, and the nozzles are often blocked and quickly worn in a short period of time, resulting in abnormal fluidization of the catalyst in the regenerator, bias flow, vortex, uneven gas distribution, easy coking, and affecting the yield. Summary of the invention

[0003] The utility model aims to solve the above technical problems and provide a feed distribution pipe and a nozzle for petrochemical industry.

[0004] In order to achieve the above technical objectives and meet the above technical requirements, the technical solution adopted by the utility model is: a feed distribution pipe and nozzle for petrochemical industry, including a central pipe, and four main pipes are evenly distributed on the central pipe in the circumferential direction, characterized in that: support pipes are evenly distributed on the central pipe below the main pipe, and the support pipes are connected to the main pipes through elbows and short pipes, and an upper branch pipe layer and a lower branch pipe layer are arranged on the main pipe, the upper branch pipe layer includes a plurality of first branch pipes symmetrically arranged along the center line of the main pipe, and the lower branch pipe layer includes a plurality of second branch pipes symmetrically arranged along the center line of the main pipe, the first branch pipe and the second branch pipe are staggered, and a plurality of nozzle assemblies are respectively arranged on the first branch pipe and the second branch pipe, and the nozzle assemblies include nozzles A and nozzles B symmetrically arranged along the center line of the branches, and a plurality of condensate discharge ports are respectively arranged at the bottom of the first branch pipe and the second branch pipe.

[0005] Preferably: the nozzle A includes a nozzle body, the nozzle body is a wear-resistant alloy cobalt, tungsten, or chromium nozzle, the nozzle body is provided with an injection channel which passes through along the axial direction of the nozzle body, the injection channel includes a first cylindrical channel, a conical channel, and a second cylindrical channel which are arranged in sequence, and the nozzle B has the same structure as the nozzle A.

[0006] Preferably, the tapered angle α of the tapered channel is set to 50°-70°.

[0007] Preferably: the diameter d1 of the first columnar channel is set to 1 / 3-1 / 2 of the diameter d of the nozzle body, the diameter d2 of the second columnar channel is set to 1 / 2-3 / 4 of the diameter d of the nozzle body, and the height h1 of the first columnar channel is set to 1 / 3-2 / 5 of the height h of the nozzle body.

[0008] Preferably, the nozzles A and B on the first branch pipe extend obliquely upward, and the nozzles A and B on the second branch pipe extend obliquely downward.

[0009] Preferably, a catalyst baffle and a main pipe cover are arranged at the upper end of the central tube, and the outer edge of the catalyst baffle is arranged in the groove of the support plate inside the shell.

[0010] Preferably, the ends of the main pipe, the first branch pipe and the second branch pipe are all provided with end plugging plates and lining retaining rings.

[0011] Preferably, the center lines of the first branch pipes of the upper branch pipe layer are located on the same plane, and the center lines of the second branch pipes of the lower branch pipe layer are located on the same plane.

[0012] Compared with the traditional structure, the utility model has the following beneficial effects: simple structure, reasonable design, high wear-resistant alloy nozzle, high wear resistance, and the nozzle is not easy to be coked, blocked and worn; through the design of appropriate cylindrical channel nozzle hole area and tapered channel, the diffusion speed of gas is improved, the fluidization efficiency is high, and the product yield is improved; double-layer branch pipe distribution is adopted, and the diffusion distribution is uniform, which ensures the normal fluidization of the catalyst in the regenerator, does not generate bias flow and eddy current, prevents the catalyst and petroleum cracking from coking around the nozzle, and extends the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the distribution pipe structure of the utility model;

[0014] Figure 2 for Figure 1 Middle BB view;

[0015] Figure 3 for Figure 1 Middle CC view;

[0016] Figure 4 for Figure 1 Enlarged view of point A in the middle;

[0017] Figure 5 This is a schematic diagram of the nozzle structure of the utility model;

[0018] Figure 6 for Figure 2 Medium DD view;

[0019] Figure 7 for Figure 2 Medium FF view;

[0020] Figure 8 for Figure 3 Middle EE view;

[0021] In the figure: 1. shell, 2. center pipe, 3. support pipe, 4. elbow, 5. short pipe, 6. lower branch pipe layer, 61. second branch pipe, 7. upper branch pipe layer, 71. first branch pipe, 8. main pipe head, 9. main pipe, 10. nozzle assembly, 101. nozzle body, 1011. first columnar channel, 1012. conical channel, 1013. second columnar channel, 11. support plate, 12. catalyst baffle, 13. condensate discharge port. DETAILED DESCRIPTION

[0022] The utility model is further described below.

[0023] Refer to the attached Figure 1-8 A feed distribution pipe and nozzle for petrochemical industry, comprising a central pipe 2, wherein four main pipes 9 are evenly arranged in the circumferential direction of the central pipe 2, characterized in that: a support pipe 3 is evenly arranged on the central pipe 2 below the main pipe 9, wherein the support pipe 3 is connected to the main pipe 9 through an elbow 4 and a short pipe 5, wherein an upper branch pipe layer 7 and a lower branch pipe layer 6 are arranged on the main pipe 9, wherein the upper branch pipe layer 7 comprises a plurality of first branch pipes 71 symmetrically arranged along the center line of the main pipe 9, wherein the lower branch pipe layer 6 comprises a plurality of second branch pipes 61 symmetrically arranged along the center line of the main pipe 9, wherein the first branch pipe 71 and the second branch pipe 61 are arranged alternately, wherein a plurality of nozzle assemblies 10 are respectively arranged on the first branch pipe 71 and the second branch pipe 61, wherein the nozzle assemblies 10 comprise nozzles A and nozzles B symmetrically arranged along the center line of the branch pipes, wherein the nozzles A and B on the first branch pipe 71 extend obliquely upward, and the nozzles A and B on the second branch pipe 61 extend obliquely downward, and wherein a plurality of condensate discharge ports 13 are respectively arranged at the bottom of the first branch pipe 71 and the second branch pipe 61.

[0024] The ends of the main pipe 9, the first branch pipe 71 and the second branch pipe 61 are all provided with end plugging plates and lining retaining rings. The center lines of the several first branch pipes 71 of the upper branch pipe layer 7 are located on the same plane, and the center lines of the several second branch pipes 61 of the lower branch pipe layer 6 are located on the same plane.

[0025] like Figure 4 As shown, a catalyst baffle 12 and a main pipe cover 8 are disposed at the upper end of the central pipe 2 , and the outer edge of the catalyst baffle 12 is disposed in a groove of the inner support plate 11 of the shell 1 .

[0026] like Figure 5As shown, the nozzle A includes a nozzle body 101, the nozzle body 101 is a wear-resistant alloy cobalt, tungsten, chromium nozzle, the nozzle body 101 is provided with an injection channel that runs through the nozzle body axis direction, the injection channel includes a first cylindrical channel 1011, a tapered channel 1012, and a second cylindrical channel 1013 that are sequentially arranged, and the nozzle B has the same structure as the nozzle A. The diameter of the nozzle body is d, the diameter of the first cylindrical channel is d1, the diameter of the second cylindrical channel is d2, d1<d2, the height of the nozzle body is h, the height of the first cylindrical channel is h1, the height of the second cylindrical channel is h2, h1<h2, and the tapered angle of the tapered channel is set to α.

[0027] Embodiment 1: The diameter d1 of the first cylindrical channel is set to 1 / 3 of the diameter d of the nozzle body, the diameter d2 of the second cylindrical channel is set to 1 / 2 of the diameter d of the nozzle body, the height h1 of the first cylindrical channel is set to 1 / 3 of the height h of the nozzle body, and the tapered angle α of the tapered channel is set to 50°.

[0028] Embodiment 2: The diameter d1 of the first cylindrical channel is set to 1 / 2 of the diameter d of the nozzle body, the diameter d2 of the second cylindrical channel is set to 3 / 4 of the diameter d of the nozzle body, the height h1 of the first cylindrical channel is set to 2 / 5 of the height h of the nozzle body, and the tapered angle α of the tapered channel is set to 60°.

[0029] In specific implementation, a 25mm AA corundum lining is used and fixed by a Y-type anchor nail; wear-resistant alloy cobalt, tungsten, and chromium nozzles are used, which have high wear resistance and are not easy to be coked, blocked, and worn; the appropriate cylindrical channel nozzle hole area and tapered channel design are used to increase the diffusion rate of the gas, improve the fluidization efficiency, and improve the product yield; the upper branch layer and lower branch layer design are adopted, the upper branch layer nozzles extend obliquely upward, and the lower branch layer nozzles extend obliquely downward, and the diffusion distribution is uniform, ensuring the normal fluidization of the catalyst in the regenerator, preventing the catalyst and petroleum cracking from coking around the nozzle, and basically no coking.

[0030] The above embodiments of the present invention are merely examples to clearly illustrate the present invention, but are not intended to limit the protection scope of the present invention. All equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by the claims.

Claims

1. A feed distribution pipe and nozzle for petrochemical industry, comprising a central pipe (2), wherein the central pipe (2) is provided with four main pipes (9) evenly distributed in the circumferential direction, characterized in that: Support pipes (3) are evenly arranged on the central pipe (2) below the main pipe (9); the support pipes (3) are connected to the main pipe (9) through elbows (4) and short pipes (5); an upper branch pipe layer (7) and a lower branch pipe layer (6) are arranged on the main pipe (9); the upper branch pipe layer (7) comprises a plurality of first branch pipes (71) symmetrically arranged along the center line of the main pipe (9); the lower branch pipe layer (6) comprises a plurality of second branch pipes (61) symmetrically arranged along the center line of the main pipe (9); the first branch pipes (71) and the second branch pipes (61) are arranged in an alternating manner; a plurality of nozzle assemblies (10) are respectively arranged on the first branch pipe (71) and the second branch pipe (61); the nozzle assemblies (10) comprise nozzles A and nozzles B symmetrically arranged along the center line of the branches; and a plurality of condensate discharge ports (13) are respectively arranged at the bottom of the first branch pipe (71) and the second branch pipe (61).

2. The feed distribution pipe and nozzle for petrochemical industry according to claim 1, characterized in that: The nozzle A comprises a nozzle body (101), the nozzle body (101) being configured as a wear-resistant alloy cobalt, tungsten or chromium nozzle, the nozzle body (101) being provided with an injection channel extending along the axial direction of the nozzle body, the injection channel comprising a first columnar channel (1011), a conical channel (1012) and a second columnar channel (1013) which are sequentially arranged, and the nozzle B has the same structure as the nozzle A.

3. The feed distribution pipe and nozzle for petrochemical industry according to claim 2, characterized in that: The tapered angle α of the tapered channel (1012) is set to 50°-70°.

4. The feed distribution pipe and nozzle for petrochemical industry according to claim 2, characterized in that: The diameter d1 of the first columnar channel (1011) is set to 1 / 3-1 / 2 of the diameter d of the nozzle body (101), the diameter d2 of the second columnar channel (1013) is set to 1 / 2-3 / 4 of the diameter d of the nozzle body (101), and the height h1 of the first columnar channel (1011) is set to 1 / 3-2 / 5 of the height h of the nozzle body (101).

5. The feed distribution pipe and nozzle for petrochemical industry according to claim 1, characterized in that: The nozzles A and B on the first branch pipe (71) extend obliquely upward, and the nozzles A and B on the second branch pipe (61) extend obliquely downward.

6. The feed distribution pipe and nozzle for petrochemical industry according to claim 1, characterized in that: The upper end of the central tube (2) is provided with a catalyst baffle (12) and a main pipe cover (8), and the outer edge of the catalyst baffle (12) is arranged in a groove of the inner support plate (11) of the shell (1).

7. The feed distribution pipe and nozzle for petrochemical industry according to claim 1, characterized in that: The ends of the main pipe (9), the first branch pipe (71) and the second branch pipe (61) are all provided with end plugging plates and lining retaining rings.

8. The feed distribution pipe and nozzle for petrochemical industry according to claim 1, characterized in that: The center lines of the plurality of first branch pipes (71) of the upper branch pipe layer (7) are located on the same plane, and the center lines of the plurality of second branch pipes (61) of the lower branch pipe layer (6) are located on the same plane.

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