Pressure grid sealing structure of up-flow fluidized bed reactor

Abstract

The utility model relates to the technical field of fluidized bed reactors, in particular to a pressure grid sealing structure of an up-flow fluidized bed reactor. The pressure grid sealing structure comprises a reactor shell, a gas rising pipe vertically and detachably mounted in the reactor shell, a supporting frame transversely and detachably mounted in the gas rising pipe, a plurality of gas rising holes vertically formed in the supporting frame and pressure grids detachably mounted at the tops of the gas rising holes. Sealing fillers are filled between the adjacent pressure grids and between the pressure grids and the inner wall of the riser, the height of the sealing fillers is lower than that of the top surfaces of the pressure grids, and each pressure grid comprises an inverted cup-shaped supporting grid and a Johnson net fixed in the supporting grid. According to the pressing grid sealing structure, the blocking type pressing grid is adopted, so that the workload of disassembly and assembly is reduced, and the precision requirement is met; and the Johnson net and the supporting grating are matched for use, so that the requirements of interception precision, pressure difference bearing and interception effect maintaining are met.

Description

Technical Field

[0001] The utility model relates to the technical field of fluidized bed reactors, in particular to a pressure grid sealing structure of an upflow fluidized bed reactor. Background Art

[0002] In the chemical production process, the upflow fluidized bed reactor is widely used in catalytic reactions and adsorption processes. Its working principle is to make the oil and gas and gas evenly mixed, distributed, and pass through the catalyst bed through the distribution plate. High-speed oil and gas move upward with evenly mixed hydrogen. The oil and gas carry fine catalyst particles. In order to reduce the carry-out and loss of catalyst particles, the pressure grid seal plays a key role at this time. The pressure grid can effectively prevent the catalyst particles from being carried to the subsequent process sections by the high-temperature oil and gas, reduce the loss of catalysts, ensure the storage of catalysts in the fluidized bed, and also ensure the stability of the oil processing volume and the qualified quality after hydrogenation, and finally ensure the safe, stable and long-term operation of the hydrogenation reaction system.

[0003] The existing pressure grid has many limitations in sealing. For example, the pressure grid needs to be welded to the reactor shell, which makes installation and removal difficult. The middle connection of the pressure grid is not tightly sealed, which can easily cause catalyst loss, wear and blockage of subsequent equipment, and affect the stability and long-term operation of the device as well as the processing volume and quality of the product. Summary of the invention

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the utility model aims to provide a pressure grid sealing structure for an upflow fluidized bed reactor.

[0005] The purpose of the utility model is achieved through the following technical scheme: a pressure grid sealing structure of an upflow fluidized bed reactor, the pressure grid sealing structure includes a reactor shell, a riser pipe vertically detachably installed in the reactor shell, a support frame laterally detachably installed in the riser pipe, a plurality of riser holes vertically opened in the support frame, and a pressure grid detachably installed on the top of each riser hole, sealing fillers are filled between adjacent pressure grids and between the pressure grids and the inner wall of the riser pipe, the height of the sealing filler is lower than the height of the top surface of the pressure grid, and the pressure grid includes a support grid in the shape of an inverted cup and a Johnson net fixed in the support grid.

[0006] Furthermore, the inner side wall in the middle of the reactor shell is provided with a plurality of first annular bosses protruding inwardly, and the outer side wall at the bottom of the riser is provided with an annular block protruding outwardly at the position corresponding to each first annular boss, and the bottom surface of the annular block abuts against the top surface of the first annular boss.

[0007] Furthermore, a second annular boss is protruding inwardly from the inner side wall of the lower middle portion of the riser, and the outer edge of the support frame abuts against the top of the second annular boss.

[0008] Furthermore, the pressing grid includes two first pressing grids in the middle of the riser pipe, four second pressing grids on the front and rear sides inside the riser pipe, and two third pressing grids on the left and right sides inside the riser pipe.

[0009] Furthermore, a ventilation pipe is fixed at each air rising hole of the support frame, and the pressing grid covers the top of the ventilation pipe.

[0010] Furthermore, a circle of grooves is formed at the bottom of the ventilation pipe. One side of the groove abuts against one side of the air rising hole of the support frame, and the other side of the groove is welded to the other side of the air rising hole of the support frame.

[0011] Furthermore, there is a gap between the inner side wall of the support grid and the outer side wall of the Johnson screen.

[0012] Furthermore, the top of the support grid and the top of the Johnson screen are fixedly connected by bolts.

[0013] The beneficial effects of the present utility model are as follows: The pressing grid sealing structure of the present utility model adopts a block-type pressing grid, which reduces the workload and precision requirements for disassembly and assembly; the combined use of the Johnson screen and the support grid meets the requirements of interception precision, pressure difference resistance and maintenance of the interception effect; the design of the inverted buckling cup shape of the pressing grid enhances the structural strength and stability of the pressing grid, while expanding the filtration area, which is beneficial to slowing down the increase of the pressure difference; the overall structure is simple, easy to manufacture and maintain, and is suitable for application in upflow fluidized bed reactors of various scales.

[0014] The pressing grid sealing structure of the present utility model can prevent and recover the catalyst solid particles carried by the rising materials, reduce the loss of the catalyst in the reactor, ensure the product quality, prevent the wear and blockage of the subsequent equipment, and ensure the stable and long-term operation of the device.

[0015] The pressing grid sealing structure of the present utility model can effectively separate the oil and gas from the catalyst, reduce the loss of the catalyst carried by the oil and gas and cause subsequent blockage and wear, and the device cannot operate stably and for a long period; at the same time, during the maintenance period, it can be disassembled conveniently and easily removed from the inside; it can also use different materials for each part according to different raw materials, while taking into account improving the corrosion resistance and saving investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural view of the present utility model.

[0017] Figure 2 is a top view of the pressing grid of the present utility model.

[0018] Figure 3 is a schematic structural view of the pressing grid of the present utility model.

[0019] The reference numerals are: reactor shell 1, first annular boss 11, riser pipe 2, annular bump 21, second annular boss 22, support frame 3, air lifting holes 31, vent pipe 32, groove 33, pressure grid 4, support grid 41, Johnson screen 42, first pressure grid 43, second pressure grid 44, third pressure grid 45, bolt 46, and sealing packing 5. Detailed implementation manners

[0020] For the convenience of understanding by those skilled in the art, the following combines examples and the attached Figures 1-3 to further illustrate the present utility model. The content mentioned in the implementation manners does not limit the present utility model.

[0021] See Figures 1-3 , a pressure grid sealing structure of an upflow fluidized bed reactor, the pressure grid sealing structure includes a reactor shell 1, a riser pipe 2 vertically and detachably installed in the reactor shell 1, a support frame 3 horizontally and detachably installed in the riser pipe 2, a plurality of air lifting holes 31 vertically opened in the support frame 3, and a pressure grid 4 detachably installed at the top of each air lifting hole 31. Sealing packing 5 is filled between adjacent pressure grids 4 and between the pressure grid 4 and the inner wall of the riser pipe 2. The height of the sealing packing 5 is lower than the top surface height of the pressure grid 4. The pressure grid 4 includes a support grid 41 in an inverted cup shape and a Johnson screen 42 fixed in the support grid 41.

[0022] The pressure grid 4 sealing structure of the present utility model adopts a segmented pressure grid 4, which reduces the workload and precision requirements for disassembly and assembly; the combined use of the Johnson screen 42 and the support grid 41 meets the requirements of interception precision, pressure difference resistance, and maintaining the interception effect; the inverted cup-shaped design of the pressure grid 4 enhances the structural strength and stability of the pressure grid 4, and at the same time expands the filtration area, which is beneficial to slowing down the increase of the pressure difference; the overall structure is simple, easy to manufacture and maintain, and is suitable for application in upflow fluidized bed reactors of various scales.

[0023] In this embodiment, a plurality of first annular bosses 11 protrude inward from the inner side wall of the middle of the reactor shell 1, and annular bumps 21 protrude outward from the outer side wall of the bottom of the riser pipe 2 corresponding to the positions of each first annular boss 11. The bottom surface of the annular bump 21 abuts against the top surface of the first annular boss 11. The setting of the above structure facilitates the installation of the riser pipe 2.

[0024] In this embodiment, a second annular boss 22 protrudes inward from the inner side wall of the middle and lower part of the riser pipe 2, and the outer edge of the support frame 3 abuts against the top of the second annular boss 22. The setting of the above structure facilitates the installation of the support frame 3, can effectively fix the pressure grid 4, and ensure the flatness and stability of the installation.

[0025] In this embodiment, the pressure grid 4 includes two first pressure grids 43 in the middle of the riser pipe 2, four second pressure grids 44 on the front and rear sides in the riser pipe 2, and two third pressure grids 45 on the left and right sides in the riser pipe 2. The segmented pressure grid 4 structure reduces the workload and precision requirements for disassembly and assembly.

[0026] In this embodiment, a vent pipe 32 is fixed at each air vent 31 of the support frame 3, and the pressure grid 4 covers the top of the vent pipe 32. The inverted cup-shaped design of the pressure grid 4 enhances the structural strength and stability of the pressure grid 4, while expanding the filtration area, which is beneficial for slowing down the increase of the pressure difference.

[0027] In this embodiment, a circular groove 33 is formed at the bottom of the vent pipe 32. One side of the groove 33 abuts against one side of the air vent 31 of the support frame 3, and the other side of the groove 33 is welded to the other side of the air vent 31 of the support frame 3. The setting of the above structure facilitates the bottom sealing of the vent pipe 32.

[0028] In this embodiment, there is a gap between the inner side wall of the support grid 41 and the outer side wall of the Johnson screen 42. The setting of the above structure meets the requirements of interception precision, pressure difference resistance and maintaining the interception effect. In other embodiments, the inner side wall of the support grid 41 can also be in contact with the outer side wall of the Johnson screen 42. The filtration precision of the Johnson screen 42 can be selected in combination with the catalyst particle size, while considering the strength required to withstand the bed pressure difference.

[0029] In this embodiment, the top of the support grid 41 and the top of the Johnson screen 42 are fixedly connected by bolts 46. The setting of the above structure facilitates the assembly of the support grid 41 and the Johnson screen 42. A lifting lug for hoisting can also be installed at the top of each pressure grid 4 to facilitate disassembly during maintenance. The material of the pressure grid 4 can be selected according to the properties of the flowing raw material, such as stainless steel or alloy steel, to improve the corrosion resistance of the pressure grid 4.

[0030] The above embodiments are the 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 pressure grid sealing structure for an upflow fluidized bed reactor, characterized in that: The pressure grid sealing structure includes a reactor shell, a gas riser detachably installed vertically in the reactor shell, a support frame detachably installed laterally in the gas riser, a plurality of gas rise holes vertically opened in the support frame, and a pressure grid detachably installed on the top of each gas rise hole. Sealing fillers are filled between adjacent pressure grids and between the pressure grids and the inner wall of the gas riser. The height of the sealing filler is lower than the height of the top surface of the pressure grid. The pressure grid includes a supporting grid in the shape of an inverted cup and a Johnson net fixed in the supporting grid.

2. The pressure grid sealing structure of an upflow fluidized bed reactor according to claim 1, characterized in that: The inner side wall in the middle of the reactor shell is provided with a plurality of first annular bosses protruding inwardly, and the outer side wall at the bottom of the riser is provided with an annular bump protruding outwardly at the position corresponding to each first annular boss, and the bottom surface of the annular bump abuts against the top surface of the first annular boss.

3. The pressure grid sealing structure of an upflow fluidized bed reactor according to claim 1, characterized in that: A second annular boss is protruding inwardly from the inner side wall of the lower middle portion of the riser, and the outer edge of the support frame abuts against the top of the second annular boss.

4. The pressure grid sealing structure of an upflow fluidized bed reactor according to claim 1, characterized in that: The pressure grid includes two first pressure grids located in the middle of the riser, four second pressure grids located at the front and rear sides of the riser, and two third pressure grids located at the left and right sides of the riser.

5. The pressure grid sealing structure of an upflow fluidized bed reactor according to claim 1, characterized in that: A vent pipe is fixed at each air riser hole of the support frame, and the pressure grille cover is arranged on the top of the vent pipe.

6. The pressure grid sealing structure of an upflow fluidized bed reactor according to claim 5, characterized in that: A circle of grooves is arranged at the bottom of the ventilation pipe, one side of the grooves abuts against one side of the air riser hole of the support frame, and the other side of the grooves is welded to the other side of the air riser hole of the support frame.

7. The pressure grid sealing structure of an upflow fluidized bed reactor according to claim 1, characterized in that: There is a gap between the inner side wall of the support grid and the outer side wall of the Johnson net.

8. The pressure grid sealing structure of an upflow fluidized bed reactor according to claim 1, characterized in that: The top of the support grid is fixedly connected to the top of the Johnson net by bolts.

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