A start-up system and method for simulating moving bed adsorption separation

Abstract

This invention relates to a start-up system and method for simulating moving bed adsorption separation; it includes a valve body, a drive rod, a transmission mechanism, and a valve ball. The valve body has four sets of openings evenly distributed along its circumference, and a control chamber communicating with the four sets of openings is provided inside the valve body. The valve ball is disposed inside the control chamber, and a connecting rod is disposed above the valve ball. A sealing chamber is disposed above the valve body, and the connecting rod passes through the top of the valve body to the interior of the sealing chamber. The transmission mechanism is disposed inside the sealing chamber, and its output end is fixedly connected to the connecting rod. The drive rod is fixedly connected to the input end of the transmission mechanism. This invention, through the four-way ball valve, can save start-up time and energy consumption, greatly shortening start-up time and saving start-up costs, while ensuring the quality of product output.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more particularly to a start-up system and method for simulating adsorption separation in a moving bed. Background Technology

[0002] Simulated moving bed adsorption fractionation is widely used in the separation of liquid chemical materials, such as the separation of n-alkanes and isoalkanes, the separation of p-xylene and other C8 aromatics, the separation of m-xylene and other C8 aromatics, and the separation of polycyclic aromatic hydrocarbons from diesel fuel. While the technology is widely applied, the start-up process requires the material to be circulated and heated first, dehydrated, and impurity-removed to meet standards, before being cooled to the adsorption tower temperature for filling. After filling, the temperature of the material entering the adsorption tower is controlled to raise the tower temperature. Once the start-up temperature is reached, the two rotary tees at the start-up position need to be manually adjusted to the normal production position to allow normal production to begin.

[0003] Currently, the traditional start-up process has the following drawbacks:

[0004] The two rotary tees at the start-up position need to be emptied of oil, and the tees need to be manually rotated to adjust to the normal production position, which greatly increases the difficulty of control and poses operational risks. These disadvantages can be avoided by adopting an improved process using ball valves. Summary of the Invention

[0005] To address the aforementioned technical deficiencies in the prior art, this invention provides a start-up system and method for simulating moving bed adsorption separation, which can effectively solve the problems in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0007] This invention discloses a start-up system for simulating adsorption separation in a moving bed, comprising a valve body, a drive rod, a transmission mechanism, and a valve ball. The valve body has four sets of openings evenly distributed along the circumference, and a control chamber communicating with the four sets of openings is provided inside the valve body. The valve ball is disposed inside the control chamber, and a connecting rod is disposed above the valve ball. A sealing chamber is disposed above the valve body, and the connecting rod passes through the top of the valve body to the interior of the sealing chamber. The transmission mechanism is disposed inside the sealing chamber, and the output end of the transmission mechanism is fixedly connected to the connecting rod. The input end of the transmission mechanism passes through one side of the sealing chamber to the outside of the sealing chamber. The drive rod is fixedly connected to the input end of the transmission mechanism. The control chamber has a spherical structure, and the control chamber is in contact with the valve ball.

[0008] In any of the above embodiments, preferably, the transmission mechanism includes a first helical gear, a second helical gear, an output shaft, an input shaft, and a fixed bracket. The output shaft is fixedly connected to the connecting rod, the second helical gear is fixedly connected to the output shaft, the first helical gear meshes with the second helical gear, and the first helical gear is disposed on the fixed bracket. The first helical gear and the fixed bracket are rotatably connected via bearings. The input shaft passes through the fixed bracket and is fixedly connected to the first helical gear. One end of the input shaft passes through the sealed chamber and is fixedly connected to the drive rod.

[0009] A sealing groove is provided on the top surface of the inner wall of the valve body. The connecting rod passes through the sealing groove, and a sealing gasket is provided on the part of the connecting rod located inside the valve body. The sealing gasket is deeply embedded in the sealing groove, and the upper half of the sealing gasket is made of rubber. A sealing ring is provided on the part of the input shaft located inside the sealing chamber, and the sealing ring contacts and engages with the inner wall of the sealing chamber.

[0010] In any of the above solutions, the starting system preferably includes:

[0011] Adsorption feed buffer tank;

[0012] The feed system is such that the output end of the adsorption feed buffer tank is connected to the input end of the feed system.

[0013] A desorbent system, wherein the output of the feed system is connected to the input of the desorbent system;

[0014] An adsorption tower system is provided, wherein the output end of the desorbent system is connected to the adsorption tower system. The adsorption tower system includes an adsorption tower, an adsorption circulation pump, and a four-way ball valve. Two sets of four-way ball valves are provided, and each four-way ball valve is provided with a liquid filling and heating position and a normal production position. The two sets of four-way ball valves are respectively located at the outlet and inlet of the adsorption circulation pump. The output end of the adsorption tower is connected to the adsorption circulation pump, and the input end of the adsorption tower is connected to the adsorption circulation pump.

[0015] The fractionation system is connected to the adsorption tower system, and the output of the fractionation system is connected to the input of the feed system.

[0016] In any of the above embodiments, it is preferred that the feeding system includes a coarse feed filter, a fine feed filter, and a bottom pump, wherein the output end of the adsorption feed buffer tank is connected to the input end of the coarse feed filter through the bottom pump, and the input end of the fine feed filter is connected to the output end of the coarse feed filter.

[0017] In any of the above embodiments, it is preferred that the desorbent system includes a coarse desorbent filter, a fine desorbent filter, and a dryer, wherein the output end of the coarse desorbent filter is connected to the input end of the fine desorbent filter, the output end of the fine desorbent filter is connected to the input end of the dryer, and the output end of the dryer is connected to the adsorption tower system.

[0018] In any of the above embodiments, it is preferred that the fractionation system includes a raffinate tower, an extractant tower, and a product tower. The input end of the raffinate tower is connected to the outlet of the adsorption circulation pump, the output end of the raffinate tower is connected to the output end of the adsorption feed buffer tank, the input end of the extractant tower is connected to the output end of the adsorption tower, and the output end of the extractant tower is connected to the input end of the product tower.

[0019] In any of the above embodiments, it is preferred that the fractionation system further includes a reflux tank, a heater, and a raffinate filter. The reflux tank is provided in three sets, and the three sets of reflux tanks are respectively connected to the raffinate tower, the extract tower, and the product tower. The heater is connected to the raffinate tower, and the raffinate filter is provided at the input end of the raffinate tower.

[0020] In any of the above embodiments, it is preferred that the start-up system further includes a feed desorbent jumper wire, which is used to connect the feed system and the desorbent system.

[0021] In any of the above embodiments, it is preferred that the start-up system further includes a bottom feed buffer tank line, which is used to connect the adsorption feed buffer tank and the fractionation system.

[0022] In any of the above embodiments, it is preferred that a first gate valve is provided on the feed desorbent jumper wire.

[0023] In any of the above embodiments, it is preferred that a second gate valve is provided on the feed buffer tank line at the bottom of the tower.

[0024] In any of the above schemes, the preferred start-up method for simulating moving bed adsorption separation includes the following steps:

[0025] Introduce materials and prepare them in a cyclical manner;

[0026] To fill the adsorption tower, open the inlet of the adsorption circulation pump to the filling and heating position, fill the bottom end cap of the adsorption tower with liquid, and after the bottom end cap of the adsorption tower is full, fill the adsorption tower bed with liquid, and after the adsorption tower bed is full, fill the top end cap of the adsorption tower with liquid.

[0027] To raise the temperature of the adsorption tower, the outlet of the adsorption circulation pump is opened to the liquid filling and heating position, so that the material flows from the top of the adsorption tower down and enters the fractionation system. The fractionation system simultaneously heats and pressurizes the material.

[0028] Adjust to normal production by moving both sets of four-way ball valves to the normal production position, and then start production.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] Compared with existing technologies, the startup system of the simulated moving bed adsorption separation of this invention, by setting up two sets of four-way ball valves, with the two sets of four-way ball valves located at the outlet and inlet of the adsorption circulation pump respectively, allows the material to flow from the top of the adsorption tower downwards during operation and enter the fractionation system through the inlet of the adsorption circulation pump. The fractionation system synchronously heats the material, which can save startup time and energy consumption, greatly shorten the startup time, save startup costs, and at the same time ensure the quality of the product output. Attached Figure Description

[0031] The accompanying drawings are provided to further illustrate the present invention and, together with the embodiments thereof, are used to explain the present invention, but do not constitute a limitation thereof.

[0032] Figure 1 This is a schematic diagram of a four-way ball valve structure for a start-up system used to simulate adsorption separation in a moving bed, provided in an embodiment of the present invention.

[0033] Figure 2 This is a schematic diagram of the overall structure of a start-up system for simulating moving bed adsorption separation provided in an embodiment of the present invention;

[0034] Figure 3 This is a flowchart of a startup method for simulating moving bed adsorption separation provided in an embodiment of the present invention.

[0035] Explanation of the labels in the diagram:

[0036] 11. Adsorption feed buffer tank; 21. Feed coarse filter; 22. Feed fine filter; 23. Bottom pump; 31. Desorbent coarse filter; 32. Desorbent fine filter; 33. Dryer; 41. Adsorption tower; 42. Adsorption circulation pump; 43. Four-way ball valve; 431. Filling and heating position; 432. Normal production position; 51. Residual liquid tower; 52. Extraction liquid tower; 53. Product tower; 54. Reflux tank; 55. Heating furnace; 56. Residual liquid Filter; 61. Feed desorbent jumper wire; 71. Feed buffer tank line to the bottom of the tower; 611. First gate valve; 711. Second gate valve; 4301. Valve body; 4302. Drive rod; 4303. Transmission mechanism; 4304. Valve ball; 4305. Connecting rod; 43031. First helical gear; 43032. Second helical gear; 43033. Output shaft; 43034. Input shaft; 43035. Fixed bracket; 4306. Sealed chamber. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0038] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0039] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0041] To better understand the above technical solutions, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] A start-up system for simulating adsorption separation in a moving bed includes a valve body 4301, a drive rod 4302, a transmission mechanism 4303, and a valve ball 4304. The valve body 4301 has four sets of openings evenly distributed along its circumference, and a control cavity communicating with the four sets of openings is provided inside the valve body 4301. The valve ball 4304 is disposed inside the control cavity, and a connecting rod 4305 is disposed above the valve ball 4304. A sealing chamber 4306 is disposed above the valve body 4301, and the connecting rod 4305 passes through it. The valve body 4301 extends from its top to the interior of the sealing chamber 4306. The transmission mechanism 4303 is located inside the sealing chamber 4306, and its output end is fixedly connected to the connecting rod 4305. The input end of the transmission mechanism 4303 extends through one side of the sealing chamber 4306 to the outside of the sealing chamber 4306. The drive rod 4302 is fixedly connected to the input end of the transmission mechanism 4303. The control cavity has a spherical structure and is in contact with the valve ball 4304.

[0043] Preferably, the transmission mechanism includes a first helical gear 43031, a second helical gear 43032, an output shaft 43033, an input shaft 43034, and a fixed bracket 43035. The output shaft 43033 is fixedly connected to the connecting rod 4305, the second helical gear 43032 is fixedly connected to the output shaft 43033, the first helical gear 43031 meshes with the second helical gear 43032, and the first helical gear 43031 is disposed on the fixed bracket 43035. The first helical gear 43031 and the fixed bracket 43035 are rotatably connected by bearings. The input shaft 43034 passes through the fixed bracket 43035 and is fixedly connected to the first helical gear 43031. One end of the input shaft 43034 passes through the sealed chamber 4306 and is fixedly connected to the drive rod 4303.

[0044] Preferably, a turntable can be mounted on the drive rod 4302 or connected to a servo motor.

[0045] Preferably, a sealing groove is formed on the top surface of the inner wall of the valve body 4301, the connecting rod 4305 passes through the sealing groove, and a sealing gasket is provided on the part of the connecting rod 4305 located inside the valve body 4301. The sealing gasket is located inside the sealing groove, and the upper half of the sealing gasket is made of rubber. A sealing ring is provided on the part of the input shaft 43024 located inside the sealing chamber 4306, and the sealing ring contacts and engages with the inner wall of the sealing chamber 4306.

[0046] The transmission mechanism 4303 can reduce direct contact between the inside and outside of the valve body, thereby preventing leakage of liquid inside the valve body. Furthermore, the use of sealing rings, sealing grooves, and sealing gaskets can further seal the inside of the valve body.

[0047] A start-up method for simulating moving bed adsorption separation, the start-up system comprising an adsorption feed buffer tank 11, a feed system, a desorbent system, an adsorption tower system, and a fractionation system, wherein the output end of the adsorption feed buffer tank 11 is connected to the input end of the feed system, the output end of the feed system is connected to the input end of the desorbent system, the output end of the desorbent system is connected to the adsorption tower system, the adsorption tower system is connected to the fractionation system, and the output end of the fractionation system is connected to the input end of the feed system.

[0048] like Figure 1 As shown, the feeding system includes a coarse feed filter 21, a fine feed filter 22, and a bottom pump 23. The output end of the adsorption feed buffer tank 11 is connected to the input end of the coarse feed filter 21 through the bottom pump 23, and the input end of the fine feed filter 22 is connected to the output end of the coarse feed filter 21.

[0049] In the simulated moving bed adsorption separation start-up system described in this embodiment of the invention, by setting the feed coarse filter 21 and the feed fine filter 22, the material can be filtered multiple times during the material feeding process, thereby improving the efficiency of the simulated moving bed start-up system.

[0050] like Figure 1 As shown, the desorbent system includes a coarse desorbent filter 31, a fine desorbent filter 32, and a dryer 33. The output end of the coarse desorbent filter 31 is connected to the input end of the fine desorbent filter 32, the output end of the fine desorbent filter 32 is connected to the input end of the dryer 33, and the output end of the dryer 33 is connected to the adsorption tower system.

[0051] In the simulated moving bed adsorption separation start-up system described in this embodiment of the invention, the dryer 33 consists of two drying tanks. The drying tanks are filled with molecular sieve desiccant for material dehydration. The molecular sieve desiccant can dehydrate the material to ensure that the material in the system meets the requirements for impurities, water content, etc.

[0052] like Figure 1 As shown, the adsorption tower system includes an adsorption tower 41, an adsorption circulation pump 42, and a four-way ball valve 43. Two sets of four-way ball valves 43 are provided, and the two sets of four-way ball valves 43 are respectively located at the outlet and inlet of the adsorption circulation pump 42. The output end of the adsorption tower 41 is connected to the adsorption circulation pump 42, and the input end of the adsorption tower 41 is connected to the adsorption circulation pump 42.

[0053] In the simulated moving bed adsorption separation start-up system described in this embodiment of the invention, the adsorption tower 41 is provided with a grid bed and molecular sieve adsorbent. Two sets of four-way ball valves 43 are provided, respectively located at the inlet rotary tee of the adsorption circulation pump 42 and the outlet rotary tee of the adsorption circulation pump 42. The four-way ball valves 43 are provided with a liquid filling and heating position 431 and a normal production position 432. During the start-up process, the four-way ball valves 43 are adjusted to the corresponding liquid filling and heating position 431 and normal production position 432 to achieve seamless connection between liquid filling and heating and normal production of the adsorption tower system.

[0054] like Figure 1 As shown, the fractionation system includes a raffinate tower 51, an extractant tower 52, and a product tower 53. The input end of the raffinate tower 51 is connected to the outlet of the adsorption circulation pump 42, the output end of the raffinate tower 51 is connected to the output end of the adsorption feed buffer tank 11, the input end of the extractant tower 52 is connected to the output end of the adsorption tower 41, and the output end of the extractant tower 52 is connected to the input end of the product tower 53.

[0055] The fractionation system further includes a reflux tank 54, a heater 55, and a raffinate filter 56. There are three sets of reflux tanks 54, which are respectively connected to the raffinate tower 51, the extract tower 52, and the product tower 53. The heater 55 is connected to the raffinate tower 51, and the raffinate filter 56 is located at the input end of the raffinate tower 51.

[0056] like Figure 1 As shown, the start-up system also includes a feed desorbent jumper line 61 and a bottom feed buffer tank line 71. The feed desorbent jumper line 61 is used to connect the feed system and the desorbent system, and the bottom feed buffer tank line 71 is used to connect the adsorption feed buffer tank 11 and the fractionation system.

[0057] like Figure 1 As shown, a first gate valve 611 is provided on the feed desorbent jumper line 61, and a second gate valve 711 is provided on the tower bottom feed buffer tank line 71.

[0058] In the simulated moving bed adsorption separation start-up system described in this embodiment of the invention, the interconnection between the top and bottom of the adsorption tower system can be achieved through the feed desorbent jumper line 61 and the bottom feed buffer tank line 71, ensuring that the material can be fed into the liquid filling process of the adsorption tower system in a timely manner.

[0059] In one specific embodiment, the material is fed into the adsorption feed buffer tank 11 by the bottom pump 23. After passing through the adsorption feed buffer tank 11, the feed desorbent jumper 61, the desorbent coarse filter 31, the desorbent fine filter 32, and the dryer 33, the impurity content and water content of the material can meet the requirements. Then, it is filled with liquid through the four-way ball valve 43 at the inlet of the adsorption circulation pump 42. After the adsorption tower 41 is filled with liquid, it enters the raffinate tower 51 of the fractionation system through the four-way ball valve 43 at the outlet of the adsorption circulation pump 42. Then, the heating furnace 55 and the adsorption tower 41 are heated synchronously. After the temperature reaches the specified temperature, the four-way ball valve 43 is opened to the normal production position to start up the operation.

[0060] like Figure 2 As shown, the present invention also provides a simulated moving bed adsorption separation process, comprising the following steps:

[0061] Material recycling preparation involves introducing materials, opening the first gate valve 611 and the second gate valve 711 to establish a material preparation recycling system, and dehydrating and removing impurities from the materials.

[0062] The adsorption tower is filled with liquid, and the pressure in adsorption tower 41 is controlled at 0.35 MPa. The inlet 43 of the adsorption circulation pump 42 is opened to the liquid filling and heating position, and the flow rate is controlled at 9 m / s² through the flow limiting orifice plate. 3 The bottom end cap of adsorption tower 41 is filled with liquid at a rate of 17 m / h. After filling, the liquid flow rate is controlled by a regulating valve. 3 The adsorption tower 41 is filled with liquid at a rate of / h. After the bed is full, the flow rate is controlled again at 9m / h through the flow-limiting orifice plate. 3 / h, the top end cap of adsorption tower 41 is filled with liquid until the pressure of the adsorption tower is 0.6 MPa after it is filled with liquid, thus completing the liquid filling of adsorption tower 41;

[0063] The adsorption tower is heated by opening the outlet 43 of the adsorption circulation pump 42 to the liquid filling and heating position, so that the material flows from the top of the adsorption tower 41 down and enters the evaporator 51 through the inlet 43 of the adsorption circulation pump 42. The heating furnace 55 is controlled to synchronously heat the material in the system and pressurize the adsorption tower 41 to 0.9 MPa, so that the temperature difference of the adsorption tower 41 is lower than 15°C, and the adsorption tower 41 is heated.

[0064] Adjust to normal production: Move both sets of four-way ball valves 43 to the normal production position, and close the first gate valve 611 and the second gate valve 711 to start production.

[0065] Example 1:

[0066] For the moving bed adsorption and separation process of p-xylene as a light desorbent, both conventional and high-efficiency systems were used for startup.

[0067] The adsorption separation process has a capacity of 1 million tons / year, a feed rate of 140 t / h, and a composition of mixed C8 aromatics; the adsorption tower feed rate is 550 t / h; the desorption dose is 650 t / h, and the composition is toluene; the energy consumption of the unit is 160 kgEo / t.

[0068] Start-up comparison indicators: material circulation preparation, adsorption tower filling, adsorption tower heating, adjustment of normal production steps, and energy consumption throughout the entire start-up process.

[0069]

[0070] Example 2:

[0071] The p-xylene simulated moving bed adsorption separation process was started up using both conventional and high-efficiency systems.

[0072] The adsorption separation process has a capacity of 250,000 tons / year, a feed rate of 70 t / h, and the composition is mixed C8 aromatics; the feed rate of the adsorption tower is 70 t / h; the desorption dose is 360 t / h, and the composition is toluene; the energy consumption of the unit is 210 kgEo / t.

[0073] Start-up comparison indicators: material circulation preparation, adsorption tower filling, adsorption tower heating, adjustment of normal production steps, and energy consumption throughout the entire start-up process.

[0074]

[0075] As can be seen from Examples 1 and 2 above, compared with the conventional start-up system of the simulated moving bed adsorption separation process, the high-efficiency start-up system of Examples 1 and 2 can save 69% of time and save more than 89% of energy. The system has significant advantages in saving start-up time and energy consumption. Using the high-efficiency start-up system can shorten the start-up time, save start-up costs, and at the same time ensure that the equipment produces qualified products and creates more benefits.

[0076] Compared with the prior art, the beneficial effects of the present invention are:

[0077] This invention simulates the start-up system of a moving bed adsorption separation system. By setting up two sets of four-way ball valves, located at the outlet and inlet of the adsorption circulation pump respectively, the material can flow from the top of the adsorption tower downwards during operation and enter the fractionation system through the inlet of the adsorption circulation pump. The fractionation system synchronously heats the material, which can save start-up time and energy consumption, greatly shorten the start-up time, save start-up costs, and at the same time ensure the quality of the product output.

[0078] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A start-up system for simulating moving bed adsorption separation, characterized in that: The commencement system includes: Adsorption feed buffer tank (11); The feeding system includes a coarse feed filter (21), a fine feed filter (22), and a bottom pump (23). The output of the adsorption feed buffer tank (11) is connected to the input of the coarse feed filter (21) via the bottom pump (23), and the input of the fine feed filter (22) is connected to the output of the coarse feed filter (21). A desorbent system, wherein the output of the feed system is connected to the input of the desorbent system; An adsorption tower system is provided, wherein the output end of the desorbent system is connected to the adsorption tower system. The adsorption tower system includes an adsorption tower (41), an adsorption circulation pump (42), and a four-way ball valve (43). Two sets of four-way ball valves (43) are provided, and the four-way ball valves (43) are provided with a liquid filling and heating position (431) and a normal production position (432). The two sets of four-way ball valves (43) are respectively located at the outlet and inlet of the adsorption circulation pump (42). The output end of the adsorption tower (41) is connected to the adsorption circulation pump (42), and the input end of the adsorption tower (41) is connected to the adsorption circulation pump (42). The fractionation system is connected to the adsorption tower system, and the output of the fractionation system is connected to the input of the feed system.

2. The start-up system for simulating moving bed adsorption separation according to claim 1, characterized in that: The four-way ball valve includes a valve body, a drive rod, a transmission mechanism, and a valve ball. The valve body has four sets of openings evenly distributed along its circumference, and a control chamber communicating with these four sets of openings is located inside the valve body. The valve ball is disposed within the control chamber, and a connecting rod is positioned above the valve ball. A sealing chamber is located above the valve body, and the connecting rod extends through the top of the valve body to the interior of the sealing chamber. The transmission mechanism is located inside the sealing chamber, and its output end is fixedly connected to the connecting rod. The input end of the transmission mechanism extends through one side of the sealing chamber to the outside of the sealing chamber. The drive rod is fixedly connected to the input end of the transmission mechanism. The control chamber has a spherical structure and contacts and engages with the valve ball. The transmission mechanism includes a first helical gear, a second helical gear, an output shaft, an input shaft, and a fixed bracket. The input shaft is fixedly connected to the connecting rod, the second helical gear is fixedly connected to the output shaft, the first helical gear meshes with the second helical gear, and the first helical gear is mounted on the fixed bracket and rotatably connected to the fixed bracket via a bearing. One end of the output shaft passes through the fixed bracket and is fixedly connected to the second helical gear, and the other end of the output shaft passes through the sealing chamber and is fixedly connected to the drive rod. A sealing groove is provided on the top surface of the inner wall of the valve body, the connecting rod passes through the sealing groove, and a sealing gasket is provided on the part of the connecting rod located inside the valve body. The sealing gasket is located inside the sealing groove, and the upper half of the sealing gasket is made of rubber. A sealing ring is provided on the part of the input shaft located inside the sealing chamber, and the sealing ring contacts and engages with the inner wall of the sealing chamber.

3. The start-up system for simulating moving bed adsorption separation according to claim 2, characterized in that: The desorbent system includes a coarse desorbent filter (31), a fine desorbent filter (32), and a dryer (33). The output end of the coarse desorbent filter (31) is connected to the input end of the fine desorbent filter (32), the output end of the fine desorbent filter (32) is connected to the input end of the dryer (33), and the output end of the dryer (33) is connected to the adsorption tower system.

4. The start-up system for simulating moving bed adsorption separation according to claim 3, characterized in that: The fractionation system includes a raffinate tower (51), an extractor tower (52), and a product tower (53). The input end of the raffinate tower (51) is connected to the outlet of the adsorption circulation pump (42), the output end of the raffinate tower (51) is connected to the output end of the adsorption feed buffer tank (11), the input end of the extractor tower (52) is connected to the output end of the adsorption tower (41), and the output end of the extractor tower (52) is connected to the input end of the product tower (53).

5. The start-up system for simulating moving bed adsorption separation according to claim 4, characterized in that: The fractionation system also includes a reflux tank (54), a heater (55), and a raffinate filter (56). There are three sets of reflux tanks (54), which are respectively connected to the raffinate tower (51), the extract tower (52), and the product tower (53). The heater (55) is connected to the raffinate tower (51), and the raffinate filter (56) is located at the input end of the raffinate tower (51).

6. The start-up system for simulating moving bed adsorption separation according to claim 5, characterized in that: The start-up system also includes a feed desorbent jumper (61) for connecting the feed system and the desorbent system.

7. The start-up system for simulating moving bed adsorption separation according to claim 6, characterized in that: The start-up system also includes a bottom feed buffer tank line (71), which is used to connect the adsorption feed buffer tank (11) and the fractionation system.

8. The start-up system for simulating moving bed adsorption separation according to claim 7, characterized in that: A first gate valve (611) is provided on the feed desorbent jumper wire (61).

9. A start-up system for simulating moving bed adsorption separation according to claim 8, characterized in that: A second gate valve (711) is installed on the feed buffer tank line (71) at the bottom of the tower.

10. A start-up method for a start-up system for simulating moving bed adsorption separation as described in any one of claims 1 to 9, characterized in that: The method includes the following steps: Introduce materials and prepare them in a cyclical manner; To fill the adsorption tower (41), open the four-way ball valve at the inlet of the adsorption circulation pump (42) to the filling and heating position (431) to fill the bottom head of the adsorption tower (41). After the bottom head of the adsorption tower (41) is filled, fill the bed of the adsorption tower (41) with liquid. After the bed of the adsorption tower (41) is filled, fill the top head of the adsorption tower (41) with liquid. The adsorption tower (41) is heated, and the four-way ball valve at the outlet of the adsorption circulation pump (42) is opened to the liquid filling and heating position (431), so that the material flows from the top of the adsorption tower (41) down and enters the evacuation liquid tower (51) of the fractionation system. The fractionation system simultaneously heats and pressurizes the material. Adjust to normal production, change the two sets of four-way ball valves to the normal production position (432), and then start production.

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