Sieve plate jet type flow equalizing plate structure for up-flow fluidized bed reactor

Abstract

The utility model relates to the technical field of fluidized bed reactors, in particular to a sieve plate jet type flow equalizing plate structure for an up-flow fluidized bed reactor, which comprises a flow equalizing plate and a plurality of distributors, each distributor comprises an air inlet pipe communicated with the flow equalizing disc, a one-way valve plate mounted at the top of the air inlet pipe and an air injection cover covering the outer side of the one-way valve plate, a plurality of nozzles are fixed to the outer side wall of each air injection cover, a supporting rod is downwards arranged in the center of the bottom of each one-way valve plate in a protruding mode, and a check block is fixed to the bottom of each supporting rod; a limiting block is fixed to the side wall of the top of the air inlet pipe and located between the check block and the one-way valve plate. According to the sieve plate jet type flow equalizing disc structure, oil gas and hydrogen can be effectively and uniformly distributed, scouring to the inner wall and inner components is relieved, meanwhile, the sieve plate jet type flow equalizing disc structure can also play a role in uniformly mixing and distributing with a newly injected cooling medium (cooling hydrogen or cooling oil), and when a catalyst of a catalyst bed layer is subjected to a boiling reaction, the flow equalizing disc structure is more stable and reliable. Uneven temperature is avoided, and generation of hot spot temperature is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fluidized bed reactors, in particular to a sieve plate jet type flow averaging disk structure for an upflow fluidized bed reactor. Background Art

[0002] In the chemical production process, the upflow fluidized bed reactor is widely used in reactors in the fields of petrochemical, chemical industry, and complex raw materials and heavy oil processing. The working principle of the fluidized bed reactor is a device in which gas-liquid phase fluid and catalyst are uniformly mixed and chemically reacted under the combined action of downward gravity and upward kinetic energy. The raw material and hydrogen mixture enter from the bottom of the reactor, and the oil and gas are evenly mixed and distributed through the sieve plate jet flow equalizer. After passing through the catalyst bed, the high-speed oil and gas move from bottom to top. The fine catalyst particles carried in the oil and gas must be separated from the oil and gas under the action of their own gravity and returned to the catalyst bed. In this process, the sieve plate jet flow equalizer plays a key role. The sieve plate jet flow equalizer is required to effectively eliminate the residual kinetic energy leaving the catalyst bed, prevent the material flow rate from being too fast to cause the internal parts to be eroded and damaged, and convert the material oblique flow state into a vertical flow state, so as to achieve the uniform distribution and boiling of the catalyst and oil and gas mixture in the bed space of the upflow fluidized bed reactor, and reduce the phenomenon of excessive radial temperature difference in the reactor.

[0003] The existing sieve plate jet flow equalizing disk has technical problems such as uneven distribution of the inlet distributor, large impact force and easy clogging. Summary of the invention

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the utility model aims to provide a sieve plate jet type flow equalizing plate structure for an upflow fluidized bed reactor.

[0005] The purpose of the utility model is achieved through the following technical scheme: a sieve plate jet type flow balancing plate structure for an upflow fluidized bed reactor, the sieve plate jet type flow balancing plate structure comprising a flow balancing plate and a plurality of distributors fixed to the top of the flow balancing plate, each distributor comprising an air inlet pipe connected to the flow balancing plate, a one-way valve installed on the top of the air inlet pipe and a jet cover arranged on the outside of the one-way valve, a plurality of nozzles are fixed to the outer wall of the jet cover, a support rod is protruding downward at the center of the bottom of the one-way valve, a block is fixed to the bottom of the support rod, a limit block is fixed to the top side wall of the air inlet pipe, and the limit block is located between the stop block and the one-way valve.

[0006] Furthermore, a concentric connecting rod is connected between the limit block and the stop block, the top of the concentric connecting rod is fixedly connected to the limit block, and the bottom of the concentric connecting rod is slidably connected to the stop block.

[0007] Furthermore, the current balancing disk is composed of a plurality of current balancing plates, and two adjacent current balancing plates are fixedly connected by bolts.

[0008] Furthermore, a sealing strip is bonded at the connection between two adjacent flow equalizing plates.

[0009] Furthermore, an external thread is provided at the bottom of the air inlet pipe, and a plurality of threaded holes matching with the external thread are provided at the top of the flow balancing plate.

[0010] Furthermore, the jet hood is in a frustum shape.

[0011] The beneficial effects of the utility model are: the sieve plate jet flow plate structure of the utility model can effectively distribute oil, gas and hydrogen evenly, reduce the scouring of the inner wall and internal components, and can also play a role in uniformly mixing and distributing the newly injected cooling medium (cooling hydrogen or cooling oil), avoiding temperature unevenness and reducing the generation of hot spot temperature during the boiling reaction of the catalyst in the catalyst bed. At the same time, during maintenance, it can be disassembled and installed conveniently, and it is easy to disassemble from the inside. Different stainless steel materials are selected for different raw materials to achieve enhanced corrosion resistance while minimizing the cost.

[0012] The sieve plate jet type flow equalizing disk structure of the utility model can effectively reduce the hydraulic impact of materials at the inlet of the reactor, provide excellent inlet conditions for the raw material distribution disk, and realize uniform distribution of materials in the catalyst bed.

[0013] The sieve plate jet flow equalizing disk structure of the utility model adopts a jetting method to improve the previous uneven distribution problem, thereby improving the distribution state of the gas-liquid phase; it has the effect of slowing down the blockage of the injection pipe and nozzle caused by impurities in the liquid and catalyst dust, and can also solve the problems of fluid backflow and reverse flow; the gas-liquid phase is mixed and distributed evenly, which can well solve the problem of uniform distribution of materials in the catalyst bed, reduce hot spots, and alleviate the problem of local coking. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 It is a top view of the utility model.

[0016] Figure 3 It is a structural schematic diagram of the distributor of the utility model.

[0017] The accompanying drawings are marked as: flow balancing disc 1, flow balancing plate 11, bolt 12, sealing strip 13, distributor 2, air intake pipe 3, limit block 31, concentric connecting rod 32, external thread 33, one-way valve plate 4, support rod 41, block 42, jet hood 5, nozzle 51. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of those skilled in the art, the following embodiments and attached Figure 1 - To further illustrate the present invention, the contents mentioned in the implementation mode are not intended to limit the present invention.

[0019] See Figure 1 -, a sieve plate jet type flow balancing plate structure for an upflow fluidized bed reactor, the sieve plate jet type flow balancing plate structure comprising a flow balancing plate 1 and a plurality of distributors 2 fixed on the top of the flow balancing plate 1, each distributor 2 comprising an air inlet pipe 3 connected to the flow balancing plate 1, a one-way valve plate 4 installed on the top of the air inlet pipe 3 and an injection cover 5 arranged on the outside of the one-way valve plate 4, a plurality of nozzles 51 are fixed to the outer wall of the injection cover 5, a support rod 41 is protruding downward at the center of the bottom of the one-way valve plate 4, a stopper 42 is fixed to the bottom of the support rod 41, a limit block 31 is fixed to the top side wall of the air inlet pipe 3, and the limit block 31 is located between the stopper 42 and the one-way valve plate 4.

[0020] The sieve plate jet flow-distributing plate structure of the utility model can effectively distribute oil, gas and hydrogen evenly, slow down the scouring of the inner wall and internal components, and can also play a role in evenly mixing and distributing the newly injected cooling medium (cooling hydrogen or cooling oil), avoiding temperature unevenness and reducing the generation of hot spot temperature during the boiling reaction of the catalyst in the catalyst bed. At the same time, during maintenance, it can be disassembled and installed conveniently, and can be easily disassembled from the inside. Different stainless steel materials are selected for different raw materials to achieve enhanced corrosion resistance while minimizing the cost.

[0021] In this embodiment, a concentric connecting rod 32 is connected between the limit block 31 and the stop block 42, the top of the concentric connecting rod 32 is fixedly connected to the limit block 31, and the bottom of the concentric connecting rod 32 is slidably connected to the stop block 42. The above-mentioned structure is convenient for limiting the one-way valve plate 4 when it moves up and down. The function of the one-way valve plate 4 in the middle of the distributor 2 is that when the pressure difference reaches a certain value (such as 30kpa) or more, the one-way valve plate 4 automatically opens, and the opening is balanced within a certain range. When it reaches the maximum, the limit block 31 and the concentric connecting rod 32 are restricted, and the gas and liquid are sprayed out from the one-way valve plate 4, and the jet hood 5 is pressure-equalized and evenly distributed. At the same time, the one-way valve plate 4 has the function of blocking and preventing backflow.

[0022] In this embodiment, the flow balancing plate 1 is composed of a plurality of flow balancing plates 11, and two adjacent flow balancing plates 11 are fixedly connected by bolts 12. The above-mentioned structure is convenient for disassembly and assembly of the flow balancing plate 1.

[0023] In this embodiment, a sealing strip 13 is bonded to the connection between two adjacent flow balancing plates 11. The above structure is arranged to facilitate the sealing of the flow balancing plate 1.

[0024] In this embodiment, the bottom of the air inlet pipe 3 is provided with an external thread 33, and the top of the flow equalizing plate 1 is provided with a plurality of threaded holes matched with the external thread 33. The above-mentioned structure is arranged to facilitate the disassembly and assembly of the distributor 2.

[0025] In this embodiment, the jet hood 5 is in a frustum shape. Specifically, the jet hood 5 is in a frustum shape. The jet hood 5 of the above shape changes the flow direction of the ejected flow, slows down the scouring effect of the flow on the surrounding internal parts, reduces the residual kinetic energy of the material, and increases the uniform mixing and distribution state of the gas and liquid.

[0026] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.

Claims

1. A sieve plate jet flow balancing plate structure for an upflow fluidized bed reactor, characterized in that: The sieve plate jet type flow equalizing disk structure includes a flow equalizing disk and a plurality of distributors fixed on the top of the flow equalizing disk, each distributor includes an intake pipe connected to the flow equalizing disk, a one-way valve installed on the top of the intake pipe, and a jet cover arranged on the outside of the one-way valve, a plurality of nozzles are fixed to the outer wall of the jet cover, a support rod is protruding downward at the center of the bottom of the one-way valve, a block is fixed to the bottom of the support rod, a limit block is fixed to the top side wall of the intake pipe, and the limit block is located between the stop block and the one-way valve.

2. The sieve plate jet type flow balancing plate structure for an upflow fluidized bed reactor according to claim 1, characterized in that: A concentric connecting rod is connected between the limit block and the stop block, the top of the concentric connecting rod is fixedly connected to the limit block, and the bottom of the concentric connecting rod is slidably connected to the stop block.

3. The sieve plate jet type flow balancing plate structure for an upflow fluidized bed reactor according to claim 1, characterized in that: The current balancing plate is composed of a plurality of current balancing plates, and two adjacent current balancing plates are fixedly connected by bolts.

4. The sieve plate jet type flow balancing plate structure for an upflow fluidized bed reactor according to claim 3, characterized in that: A sealing strip is bonded to the connection between two adjacent flow equalizing plates.

5. The sieve plate jet type flow balancing plate structure for an upflow fluidized bed reactor according to claim 1, characterized in that: The bottom of the air inlet pipe is provided with an external thread, and the top of the flow equalizing plate is provided with a plurality of threaded holes matched with the external thread.

6. The sieve plate jet type flow balancing plate structure for an upflow fluidized bed reactor according to claim 1, characterized in that: The jet hood is in a frustum shape.

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