Combined gas distributor

Abstract

The utility model relates to a combined gas distributor. The gas distributor comprises a primary baffle and a plurality of secondary diffusers, the gas distributor further comprises a cylindrical shell, the cylindrical shell is installed in the fixed bed catalytic reactor, an opening in the upper end of the cylindrical shell covers a gas inlet of the fixed bed catalytic reactor, the lower end of the cylindrical shell is a bottom plate, a gas mixing chamber is formed in the fixed bed catalytic reactor, and the primary baffle is installed in the gas mixing chamber and right faces the gas inlet of the fixed bed catalytic reactor. A plurality of sieve pores are distributed on the second-stage diffusers, and the second-stage diffusers are distributed on the bottom plate. A gas mixing chamber is designed, gas enters from a gas inlet of a fixed bed catalytic reactor, the gas is diffused into the gas mixing chamber through a first-stage structure (a first-stage baffle) and is further expanded, kinetic energy of the gas is converted into static energy, and the static energy is guided by a second-stage structure (a plurality of second-stage diffusers) to form stable downward flow, so that bias flow and turbulent flow are avoided, and the resistance is reduced; and therefore, the heat exchanger is suitable for a large-diameter large-scale reactor.

Description

Technical Field

[0001] The utility model relates to a fixed bed catalytic reactor, in particular to a combined gas distributor. Background Art

[0002] Fixed-bed catalytic reactors are the main equipment widely used in the petrochemical industry. Their basic structures can be divided into two categories: packed bed and shell-and-tube catalytic reactors.

[0003] As the equipment becomes larger, the diameter of the reactor is also increasing. The traditional gas distributor concentrated under the inlet pipe can no longer meet the use requirements. How to guide the incoming reaction gas to form a stable downward flow, without bias flow, turbulence, low resistance drop, and evenly distribute it to each heat exchange tube is an extremely important issue. Utility Model Content

[0004] The utility model proposes a combined gas distributor, aiming to solve the above problems.

[0005] The technical solution of this utility model:

[0006] A combined gas distributor, comprising a primary baffle and several secondary diffusers; characterized in that the gas distributor also includes a cylindrical shell, which is installed in a fixed bed catalytic reactor, with an upper opening facing the air inlet of the fixed bed catalytic reactor and a lower end being a bottom plate, forming a gas mixing chamber in the fixed bed catalytic reactor, the primary baffle being installed in the gas mixing chamber, facing the air inlet of the fixed bed catalytic reactor, with several sieve holes distributed on it, and the secondary diffusers being distributed and installed on the bottom plate.

[0007] The above technical solution is further refined, and the first-level baffle is an arched plate; it allows the gas to diffuse radially while increasing the gas flow area and reducing the resistance drop.

[0008] The secondary diffuser is a tapered louver diffuser; its smooth streamlined design changes the gas flow direction while reducing the resistance drop, guiding the incoming reaction gas to form a stable downward flow, without bias flow, turbulence, low resistance drop, and evenly distribute it to each heat exchange tube

[0009] The above technical solution is further improved in that an adjustable baffle is connected to the middle of the conical louver diffuser through a screw; the flow rate is adjusted by adjusting the gap between the adjustable baffle and the innermost blades of the conical louver diffuser through the screw.

[0010] The above technical solution is further refined. The base plate is composed of several blocks, and the blocks are fixedly connected by bolts; it is easy to manufacture and install; and each secondary diffuser is installed on each block in a one-to-one correspondence.

[0011] The above technical solution is further refined, and the blocks are folded thin plate structures.

[0012] The advantages of the utility model are reasonable design and simple structure. A gas mixing chamber is designed, and air is introduced into the air inlet of the fixed bed catalytic reactor. The gas diffuses into the gas mixing chamber through a primary baffle, where the gas is further expanded, and the kinetic energy of the gas is converted into static energy. The gas is then guided through each secondary diffuser to form a stable downward flow with no biased flow, no turbulence, low resistance drop, and is evenly distributed to each heat exchange tube. The utility model is suitable for large-diameter large reactors. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the installation of a combined gas distributor.

[0014] Figure 2 yes Figure 1 Schematic diagram of the AA direction.

[0015] In the figure, there is a primary baffle 1, a secondary diffuser 2, a cylindrical shell 3, a fixed bed catalytic reactor 4, an air inlet 4-1 of the fixed bed catalytic reactor, a bottom plate 5, a block 5-1, a bolt 5-2, a gas mixing chamber 6, a connecting rod 7, a screw 8, and an adjustable baffle 9. DETAILED DESCRIPTION

[0016] like Figure 1-2 As shown, a combined gas distributor includes a primary baffle 1 and several secondary diffusers 2. The gas distributor also includes a cylindrical shell 3, which is installed in a fixed-bed catalytic reactor 4. The upper end opening of the cylindrical shell 3 is located above the air inlet 4-1 of the fixed-bed catalytic reactor, and the lower end is a bottom plate 5. A gas mixing chamber 6 is formed in the fixed-bed catalytic reactor 4 (located above the heat exchange tubes and catalytic layer of the fixed-bed catalytic reactor). The primary baffle 1 is installed in the gas mixing chamber 6 (the upper part is fixed to the fixed-bed catalytic reactor by a connecting rod 7), facing the air inlet 4-1 of the fixed-bed catalytic reactor, and is provided with several sieve holes distributed thereon. The bottom plate 5 is composed of several blocks 5-1, and the blocks 5-1 are fixedly connected by bolts 5-2. The secondary diffusers 2 are installed on the blocks 5-1 in a one-to-one correspondence.

[0017] The first-level baffle 1 is an arched plate;

[0018] The secondary diffuser 2 is a conical shutter diffuser, with an adjustable baffle 9 connected in the middle via a screw 8;

[0019] Block 5-1 is a folded thin plate structure (the connecting side has the shortest length).

[0020] The above are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A combined gas distributor, comprising a primary baffle and several secondary diffusers; characterized in that: The gas distributor also includes a cylindrical shell, which is installed in the fixed bed catalytic reactor, with an upper opening facing the air inlet of the fixed bed catalytic reactor and a lower end serving as a bottom plate, forming a gas mixing chamber in the fixed bed catalytic reactor. The first-level baffle is installed in the gas mixing chamber, facing the air inlet of the fixed bed catalytic reactor, with a plurality of sieve holes distributed on it, and each second-level diffuser is distributed and installed on the bottom plate.

2. A combined gas distributor according to claim 1, characterized in that: The primary baffle is an arched plate.

3. A combined gas distributor according to claim 1, characterized in that: The secondary diffuser is a conical shutter diffuser.

4. A combined gas distributor according to claim 3, characterized in that: An adjustable baffle is connected in the middle of the conical shutter diffuser via a screw.

5. A combined gas distributor according to claim 1, characterized in that: The base plate is composed of a plurality of blocks, and the blocks are fixedly connected by bolts; and each secondary diffuser is mounted on each block in a one-to-one correspondence.

6. A combined gas distributor according to claim 5, characterized in that: The blocks are folded thin plate structures.

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