Gas riser structure for gas-liquid separation of up-flow fluidized bed reactor
By designing an upstream boiling bed reactor with a raising pipe structure including Johnson net, liquid collection tank and pressure gate, the problems of catalyst loss and rising fixed bed pressure drop caused by poor gas-liquid phase separation in the prior art are solved, and the effective recovery of catalysts and equipment protection are achieved, resources are saved and costs are reduced.
Patent Information
- Application Number
- CN202421660209.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-15
AI Technical Summary
The prior art uplift pipe structure cannot effectively perform gas-liquid phase separation, resulting in the catalyst particles being carried by high-temperature oil and gas to the subsequent stage, resulting in the problem of catalyst loss and the increase in the pressure drop of the fixed bed reactor.
A escalator structure of an upstream boiling bed reactor is designed, including a vertically removable and installed escalator body. A Johnson net, a liquid collection tank and a press gate are installed in the escalator body from top to bottom. The Johnson net is used to filter catalyst dust, the liquid collection tank is used to recover liquid, and the press gate is used to prevent catalyst loss.
By cleaning and filtration of the gas phase, the catalyst is prevented from being brought out along with the gas phase, ensuring the service life of the fixed bed catalyst, reducing the risk of bed pressure drop and equipment wear, and at the same time, the separation of the gas-liquid phase and heat exchange are achieved, saving land use and reducing construction and operation costs.
Smart Images
Figure CN222816809U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fluidized bed reactors, in particular to a riser structure for gas-liquid separation in 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. At this time, the high-speed oil and gas move upward while being evenly mixed with hydrogen. The oil and gas carry fine catalyst particles. In order to prevent the catalyst particles from being carried out and lost, the gas-liquid separation riser body plays a key role at this time. The gas-liquid separation riser structure 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, and ensure the storage of catalysts in the fluidized bed. At the same time, it also ensures that the gas and liquid phases can be completely separated in the separation riser body, the liquid is partially extracted and circulated, and the heat is recycled internally.
[0003] The riser structure of the prior art can only perform boiling reaction inside the boiling bed and does not have the function of gas-liquid phase separation; it cannot effectively reduce the high-temperature oil and gas carrying catalyst dust to subsequent work sections; it cannot effectively protect the subsequent fixed bed reactor and slow down the pressure drop increase of the fixed bed reactor. Summary of the invention
[0004] In order to overcome the shortcomings and deficiencies in the prior art, the utility model aims to provide a riser structure for gas-liquid separation in an upflow fluidized bed reactor.
[0005] The purpose of the utility model is achieved through the following technical scheme: a riser structure for gas-liquid separation in an upflow fluidized bed reactor, comprising a riser body vertically detachably installed in a reactor shell, a Johnson net, a liquid collecting tank and a pressure grid are installed in the riser body from top to bottom in sequence, the top cover of the Johnson net is provided with an umbrella cap, a plurality of tower plates are staggered and stacked in the liquid collecting tank, a plurality of float valves are provided on the tower plates, and a circulating oil extraction outlet connected to the liquid collecting tank is opened on one side of the reactor shell.
[0006] Furthermore, a plurality of vertically arranged reinforcing ribs are fixed to the outer side of the Johnson net.
[0007] Furthermore, the riser body is provided with a notch corresponding to the top of the liquid collecting tank, and an inclined baffle is fixed to the top of the liquid collecting tank, with the end of the baffle extending to the inner wall of the reactor shell.
[0008] Furthermore, the baffle is provided with a plurality of tear holes.
[0009] Furthermore, an annular boss is protruding inwardly from the inner side wall in the middle of the reactor shell, and a first annular block is protruding outwardly from the outer side wall at the bottom of the riser body at a position corresponding to the annular boss, and the bottom surface of the first annular block abuts against the top surface of the annular boss.
[0010] Furthermore, at least one second annular protrusion is protruding inwardly from the inner side wall in the middle of the reactor shell, and a third annular protrusion is protruding outwardly from the outer side wall at the bottom of the riser body at a position corresponding to the second annular protrusion, and the second annular protrusion and the third annular protrusion are fixedly connected by bolts.
[0011] The beneficial effects of the utility model are as follows: the riser structure of the utility model cleans and filters the gas phase, extracts a large amount of catalyst dust through the liquid, prevents the catalyst from being carried out to the back road with the gas phase, ensures the service life of the fixed bed catalyst in the subsequent process section, reduces the bed pressure drop, and reduces the risk of clogging and wear of instruments, valves, and equipment. The riser structure of the utility model completes gas phase filtration, gas-liquid phase separation, heat exchange, and the reaction of catalyst and raw materials in one reactor, saving land space, reducing equipment layout, and reducing construction and operation costs.
[0012] At high temperatures, the corrosiveness of various corrosive acids in heavy oils such as palmitic acid oil, coal tar, residual oil, and waste lubricating oil will increase. The riser structure of the utility model alleviates the corrosion of the equipment to a certain extent, and achieves the above effect by circulating the reaction effluent oil and reducing the content of corrosive substances in the feed.
[0013] The riser structure of the utility model reduces the wear and scouring damage to the interior of the equipment and internal parts by changing the direction and flow rate of the rising high-temperature oil and gas. The riser structure of the utility model can ensure that the raw materials and catalysts in the lower boiling bed can be effectively separated from the oil and gas and the catalyst particles after the reaction, and the catalyst can be recovered to reduce the loss. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a structural schematic diagram of the utility model.
[0015] The accompanying drawings are marked as follows: reactor shell 1, annular boss 11, second annular protrusion 12, riser body 2, notch 21, baffle 22, tear hole 23, first annular protrusion 24, third annular protrusion 25, bolt 26, Johnson net 3, reinforcing rib 31, liquid collecting tank 4, tower plate 41, float valve 42, circulating oil extraction outlet 43, pressure grid 5, umbrella cap 6. DETAILED DESCRIPTION
[0016] In order to facilitate the understanding of those skilled in the art, the following embodiments and attached Figure 1To further illustrate the present invention, the contents mentioned in the implementation modes are not intended to limit the present invention.
[0017] See Figure 1 , a gas riser structure for gas-liquid separation of an upflow fluidized bed reactor, comprising a gas riser body 2 vertically detachably installed in a reactor shell 1, a Johnson net 3, a liquid collecting tank 4 and a pressure grid 5 are installed in the gas riser body 2 from top to bottom, the top cover of the Johnson net 3 is provided with an umbrella cap 6, a plurality of tower plates 41 are staggered and stacked in the liquid collecting tank 4, and the tower plates 41 are provided with a plurality of float valves 42, and a circulating oil extraction port 43 connected to the liquid collecting tank 4 is opened on one side of the reactor shell 1. The Johnson net 3 is mainly used to filter the catalyst dust carried by the high-temperature oil and gas. The Johnson net 3 is a filter welded into a sieve tube shape with metal wire or strip, and has the characteristics of high strength, corrosion resistance, and not easy to clog. According to different working conditions and flow medium, various materials such as stainless steel, alloy or titanium can be selected. The liquid collecting tank 4 mainly recovers the liquid flowing down from the tower plate 41 and the liquid in the reaction effluent. The pressure grid 54 can prevent the catalyst from running away, and prevent the high-temperature oil and gas from carrying catalyst particles due to unstable operation and fluctuation, resulting in a reduction in the internal catalyst reserve. The umbrella cap 6 is buckled on the top of the Johnson net 3. Its main function is to change the direction of oil and gas flow, ensure that all oil and gas are filtered by the Johnson net 3 before flowing out from the gas phase port, and also reduce the flow rate of high-temperature oil and gas to reduce equipment scouring. The tower plate 41 is a high-efficiency tower plate, and its main functions are gas-liquid separation, cleaning impurities (catalysts) carried by high-temperature oil and gas, mass transfer and heat transfer. The bottom design of the tower plate 41 also adopts a method of reducing the flow rate of high-temperature liquid to prevent impact on the tower plate 41. According to the gas-liquid phase load, a number of float valves 42 are arranged on each tower plate 41, and the heat and mass transfer process is completed here by the rising gas phase and the downward flowing gas phase. The main function of the circulating oil extraction port 43 is to extract the liquid phase product of the reaction effluent, a part of which is used as the reaction product, and the other part is returned to the reactor inlet to mix with the raw materials to make circulating oil.
[0018] The riser structure of the utility model cleans and filters the gas phase, extracts a large amount of catalyst dust through the liquid, prevents the catalyst from being carried out to the back road with the gas phase, ensures the service life of the fixed bed catalyst in the subsequent process section, reduces the bed pressure drop, and reduces the risk of clogging and wear of instruments, valves, and equipment. The riser structure of the utility model completes gas phase filtration, gas-liquid phase separation, heat exchange, and the reaction of catalyst and raw materials in one reactor, saving land space, reducing equipment layout, and reducing construction and operation costs.
[0019] In this embodiment, a plurality of vertically arranged reinforcing ribs 31 are fixed to the outer side of the Johnson net 3. The reinforcing ribs 31 are used to provide support for the Johnson net 3 to prevent external forces from damaging the entire filter shape.
[0020] In this embodiment, the riser body 2 is provided with a notch 21 corresponding to the top of the liquid collecting tank 4, and a baffle 22 arranged obliquely is fixed to the top of the liquid collecting tank 4, and the end of the baffle 22 extends to the inner wall of the reactor shell 1. Specifically, the baffle 22 is provided with a plurality of tear holes 23. The function of the tear holes 23 is to remove the gas in the internal liquid phase when there is too much gas phase in the lower liquid extraction port, causing the pump to be emptied.
[0021] In this embodiment, the inner side wall of the middle part of the reactor shell 1 is provided with an annular boss 11 protruding inwardly, and the outer side wall of the bottom of the riser body 2 is provided with a first annular convex block 24 protruding outwardly at the position corresponding to the annular boss 11, and the bottom surface of the first annular convex block 24 abuts against the top surface of the annular boss 11. The above-mentioned structure is arranged to facilitate the support of the riser body 2.
[0022] In this embodiment, at least one second annular protrusion 12 is protruded inwardly on the inner side wall of the middle part of the reactor shell 1, and a third annular protrusion 25 is protruded outwardly on the outer side wall of the bottom of the riser body 2 corresponding to the position of the second annular protrusion 12, and the second annular protrusion 12 and the third annular protrusion 25 are fixedly connected by bolts 26. The above-mentioned structure is convenient for disassembly and assembly of the riser body 2.
[0023] 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 riser structure for gas-liquid separation in an upflow fluidized bed reactor, comprising a riser body vertically detachably mounted in a reactor shell, characterized in that: A Johnson net, a liquid collecting tank and a pressure grid are installed in the riser body from top to bottom in sequence. The top cover of the Johnson net is provided with an umbrella cap. Multiple tower plates are installed in a staggered manner in the liquid collecting tank. The tower plates are provided with multiple float valves. A circulating oil extraction outlet connected to the liquid collecting tank is opened on one side of the reactor shell.
2. The riser structure for gas-liquid separation in an upflow fluidized bed reactor according to claim 1, characterized in that: A plurality of vertically arranged reinforcing ribs are fixed to the outer side of the Johnson net.
3. The riser structure for gas-liquid separation in an upflow fluidized bed reactor according to claim 1, characterized in that: The riser body is provided with a notch corresponding to the top of the liquid collecting tank. An inclined baffle is fixed to the top of the liquid collecting tank, and the end of the baffle extends to the inner wall of the reactor shell.
4. The riser structure for gas-liquid separation in an upflow fluidized bed reactor according to claim 3, characterized in that: The baffle is provided with a plurality of tear holes.
5. The riser structure for gas-liquid separation in an upflow fluidized bed reactor according to claim 1, characterized in that: An annular boss is protruding inwardly from the inner side wall of the middle part of the reactor shell, and a first annular block is protruding outwardly from the outer side wall of the bottom of the riser body at a position corresponding to the annular boss, and the bottom surface of the first annular block abuts against the top surface of the annular boss.
6. The riser structure for gas-liquid separation in 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 at least one second annular protrusion protruding inwardly, and the outer side wall at the bottom of the riser body is provided with a third annular protrusion protruding outwardly at a position corresponding to the second annular protrusion, and the second annular protrusion is fixedly connected to the third annular protrusion by bolts.