Multi-zone reactor with multi-stage temperature control

Abstract

The utility model discloses a kind of multizone reactors of multistage temperature control belongs to reactor temperature control technical field.The reactor includes multizone reactor body, circulating gas compressor, reactor cooler and multistage control valve group.Multizone reactor body includes ascending section and descending section, gas enters gas circulation through the top of descending section;The inlet of circulating gas compressor is communicated with the top of descending section, and circulating gas compressor is used to compress circulating gas;The inlet of reactor cooler is communicated with the outlet of circulating gas compressor, and the outlet of reactor cooler is communicated with multizone reactor body, and the outer periphery of reactor cooler is provided with jacket pipe line, for passing into cooling medium to cool circulating gas;Multistage control valve group is arranged on jacket pipe line to control cooling medium flow in stages to cool circulating gas in stages.The multizone reactor of multistage temperature control provided by the utility model can control temperature in stages, significantly improve the precision of temperature control, avoid temperature sustained shock, reduce the risk of reactor caking.

Description

Technical Field

[0001] This invention belongs to the field of reactor temperature control technology, and particularly relates to a multi-zone reactor with multi-stage temperature control. Background Technology

[0002] Multi-zone reactors are widely used in chemical processes such as polymerization, and the accuracy of their temperature control directly affects reaction efficiency and equipment operational stability. In existing technologies, multi-zone reactors often employ a single valve for temperature control, particularly relying on valves with large diameters. This control method struggles to meet the demands of high-precision temperature regulation and is prone to causing continuous temperature fluctuations. Temperature fluctuations significantly increase the risk of material agglomeration within the reactor, leading not only to fluctuations in reaction efficiency and decreased product quality consistency but also potentially affecting equipment operational stability, increasing safety hazards and process control difficulties during production. Current technologies exhibit significant shortcomings in the accuracy and stability of temperature control in multi-zone reactors, necessitating improvements to control methods to enhance temperature regulation accuracy, reduce the risk of agglomeration, and ensure the high efficiency of the reaction process and the reliability of the production system. Summary of the Invention

[0003] In view of the shortcomings of the related technologies, the purpose of this utility model is to provide a multi-zone reactor with multi-stage temperature control to solve the problems mentioned in the background technology.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A multi-zone reactor with multi-stage temperature control, comprising:

[0006] The multi-zone reactor body includes an ascending section and a descending section. The bottom of the ascending section is used for material fluidization reaction, and the top of the ascending section is equipped with a vortex separator for gas-solid separation, so that the separated gas enters the gas circulation through the top of the descending section.

[0007] A recirculating gas compressor has an inlet and an outlet. The inlet of the recirculating gas compressor is connected to the top of the descending section. The recirculating gas compressor is used to compress recirculating gas.

[0008] The reactor cooler has an inlet and an outlet. The inlet of the reactor cooler is connected to the outlet of the circulating gas compressor, and the outlet of the reactor cooler is connected to the multi-zone reactor body. The reactor cooler is provided with a jacketed pipeline on its outer periphery, which is used to introduce a cooling medium to cool the circulating gas.

[0009] Multi-stage control valve assembly, located on jacketed pipeline, is used to control the flow rate of cooling medium in stages to cool the circulating gas in stages.

[0010] In some embodiments, the multi-stage control valve group includes a first regulating valve and a second regulating valve, wherein the orifice of the first regulating valve is larger than that of the second regulating valve.

[0011] In some embodiments, the first regulating valve has a diameter of DN350, and the second regulating valve has a diameter of DN100.

[0012] In some embodiments, the multi-zone reactor with multi-stage temperature control also includes a temperature sensor and a control system. The temperature sensor is used to detect the temperature inside the multi-zone reactor body. The temperature sensor is signal-connected to the control system. The control system is electrically connected to the first regulating valve and the second regulating valve, respectively, to control the opening degree of the first regulating valve and the second regulating valve according to the detection value of the temperature sensor.

[0013] In some embodiments, both the first regulating valve and the second regulating valve are butterfly valves.

[0014] In some embodiments, the control system is a PLC.

[0015] In some embodiments, the jacketed pipeline includes an inlet branch and an outlet branch, and a multi-stage control valve assembly is located on the inlet branch or the outlet branch.

[0016] In some embodiments, the inlet branch and the outlet branch are respectively arranged around the outer periphery of the reactor cooler to form an annular cooling channel.

[0017] In some embodiments, the inner wall of the jacketed pipe is provided with turbulence protrusions, which are spirally distributed along the flow direction of the cooling medium to enhance the heat exchange efficiency between the cooling medium and the reactor cooler.

[0018] In some embodiments, the reactor cooler is provided with a tube assembly, and the cooling medium in the jacketed pipes exchanges heat with the circulating gas in the tube assembly through the pipe walls.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. The multi-zone reactor with multi-stage temperature control provided by this utility model, by setting a multi-stage control valve group consisting of a first regulating valve and a second regulating valve on the jacket pipeline, utilizes the difference in valve diameter to achieve graded temperature control, which significantly improves the accuracy of temperature control in the multi-zone reactor, greatly reduces temperature fluctuations, effectively reduces the risk of agglomeration caused by temperature fluctuations in the multi-zone reactor, and improves reaction stability and production safety.

[0021] 2. In the multi-zone reactor with multi-level temperature control provided by this utility model, temperature data inside the multi-zone reactor is collected in real time by temperature sensors and transmitted to the control system. The control system automatically adjusts the opening of the first regulating valve and the second regulating valve according to preset logic, realizing the full automation of temperature signal acquisition, processing and valve adjustment, accurately matching the cooling requirements under different working conditions, and improving production efficiency and product quality. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of an embodiment of the multi-zone reactor with multi-stage temperature control according to this utility model;

[0024] Figure 2 This is a block diagram illustrating the control principle of one embodiment of the multi-zone reactor with multi-stage temperature control according to this utility model.

[0025] In the picture:

[0026] 1. Multi-zone reactor body; 2. Circulating gas compressor; 3. Reactor cooler; 4. Jacketed pipeline; 41. Inlet branch; 42. Outlet branch; 5. Multi-stage control valve group; 51. First regulating valve; 52. Second regulating valve; 6. Temperature sensor; 7. Control system. Detailed Implementation

[0027] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 utility model 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 utility model.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] See appendix Figures 1 to 2 This invention provides an illustrative embodiment of a multi-zone reactor with multi-stage temperature control proposed in this invention. The multi-zone reactor with multi-stage temperature control includes a multi-zone reactor body 1, a circulating gas compressor 2, a reactor cooler 3, a jacketed pipeline 4, and a multi-stage control valve group 5.

[0031] The multi-zone reactor body 1 includes an ascending section and a descending section. The bottom of the ascending section is used for material fluidization reaction, and the top of the ascending section is equipped with a cyclone separator for gas-solid separation, so that the separated gas enters the gas circulation through the top of the descending section. Specifically, the bottom of the ascending section is the material fluidization reaction zone, where the compressed circulating gas carries material particles from bottom to top, causing a polymerization reaction. The cyclone separator at the top of the ascending section is a cyclone separator that achieves gas-solid separation: the solid particles after the reaction settle to the bottom of the descending section to continue participating in the reaction, and the separated gas enters the inlet of the circulating gas compressor 2 through a pipeline.

[0032] The circulating gas compressor 2 has an inlet and an outlet. The inlet of the circulating gas compressor 2 is connected to the top of the descending section. The circulating gas compressor 2 is used to compress the circulating gas. The reactor cooler 3 has an inlet and an outlet. The inlet of the reactor cooler 3 is connected to the outlet of the circulating gas compressor 2. The outlet of the reactor cooler 3 is connected to the multi-zone reactor body 1. The reactor cooler 3 is provided with a jacketed pipe 4 on its outer periphery. The jacketed pipe 4 is used to introduce a cooling medium to cool the circulating gas.

[0033] Specifically, the circulating gas compressor 2 compresses the gas, which is then sent to the inlet of the reactor cooler 3 through its outlet. In this embodiment, the reactor cooler 3 is a shell-and-tube heat exchanger with an internal shell-and-tube assembly. The circulating gas flows within the shell and tubes, and the jacketed pipes 4 surround the outer periphery of the reactor cooler 3, forming an annular cooling channel. In this embodiment, the cooling medium flowing through the jacketed pipes 4 is jacketed water, i.e., industrial circulating water, which exchanges heat with the circulating gas inside the tubes through the tube walls to achieve cooling. The cooled gas returns to the multi-zone reactor body 1 through the outlet of the reactor cooler 3, forming a closed-loop system.

[0034] In this embodiment, the tube assembly inside the reactor cooler 3 is made of stainless steel. Cooling is achieved by the jacketed water absorbing heat from the circulating gas through heat conduction through the tube walls. The number and diameter of the tubes are optimized based on the circulating gas flow rate to ensure a balance between heat exchange efficiency and pressure loss.

[0035] The jacketed pipeline 4 includes an inlet branch 41 and an outlet branch 42. The inlet branch 41 and the outlet branch 42 are respectively arranged around the outer periphery of the reactor cooler 3 to form an annular cooling channel, so that the jacket water flows evenly around the tube assembly and avoids uneven local cooling.

[0036] The multi-stage control valve assembly 5 is installed on the jacketed pipeline 4. The multi-stage control valve assembly 5 is used to control the flow rate of the cooling medium in stages to cool the circulating gas in stages. Specifically, the multi-stage control valve assembly 5 can be installed on the inlet branch 41 or the outlet branch 42 according to the actual layout requirements.

[0037] The multi-stage control valve assembly 5 includes a first regulating valve 51 and a second regulating valve 52, with the first regulating valve 51 having a larger orifice than the second regulating valve 52. Specifically, the first regulating valve 51 is a coarse regulating valve with an orifice diameter of DN350, employing a butterfly valve structure, used for quickly adjusting the jacket water flow rate to achieve coarse temperature adjustment. The second regulating valve 52 is a fine regulating valve with an orifice diameter of DN100, also employing a butterfly valve structure, used for finely adjusting the jacket water flow rate to achieve fine temperature adjustment.

[0038] Both the first regulating valve 51 and the second regulating valve 52 are butterfly valves. They feature flexible adjustment, rapid response, and compact structure. Flow rate can be precisely controlled through minute valve position changes, meeting the accuracy requirements of fine-tuning. The valve plate rotation requires only a small torque, allowing opening, closing, or adjustment to be completed in a short time, adapting to real-time temperature control needs. Their small footprint facilitates parallel installation within the annular channel of the jacketed pipeline 4.

[0039] In this embodiment, the multi-zone reactor with multi-stage temperature control also includes a temperature sensor 6 and a control system 7. The temperature sensor 6 is used to detect the temperature inside the multi-zone reactor body 1. The temperature sensor 6 is signal-connected to the control system 7. The control system 7 is electrically connected to the first regulating valve 51 and the second regulating valve 52 respectively, so as to control the opening degree of the first regulating valve 51 and the second regulating valve 52 according to the detection value of the temperature sensor 6.

[0040] Temperature sensor 6 is installed on the pipeline at the top of the descending section of the multi-zone reactor body 1, which is connected to the inlet of the circulating gas compressor 2. It detects the reaction temperature in real time and transmits the signal to the control system 7. The control system 7 is a PLC with a built-in PID control algorithm. It automatically generates control commands based on the temperature deviation. When the temperature is higher than the target value, the jacket water flow rate is increased by opening the regulating valve. When the temperature is lower than the target value, the jacket water flow rate is decreased by closing the regulating valve.

[0041] Specifically, the preset target temperature for the multi-zone reactor body 1 is 70℃. During the coarse adjustment stage, when the temperature inside the multi-zone reactor body 1 deviates from the set range, the control system 7 prioritizes fully opening the second regulating valve 52, and significantly adjusts the jacket water flow rate through the first regulating valve 51, quickly pre-adjusting the temperature to within ±1℃ of the target value, i.e., 70±1℃. During the fine adjustment stage, when the temperature inside the multi-zone reactor body 1 is close to the target value, the control system 7 automatically switches to the second regulating valve 52 for adjustment. By opening 1-2 valve positions, the jacket water flow rate is finely adjusted to precisely control the temperature within ±0.3℃ of the target value, i.e., 70±0.3℃. This tiered control method provides high temperature control accuracy and avoids temperature fluctuations.

[0042] In this embodiment, the inner wall of the jacketed pipe 4 is provided with turbulence protrusions. The turbulence protrusions are spirally distributed along the flow direction of the cooling medium. When the jacket water flows, the turbulence protrusions can destroy the fluid boundary layer and enhance the degree of turbulence, thereby enhancing the heat exchange efficiency between the cooling medium and the reactor cooler 3 and shortening the response time of temperature regulation.

[0043] In the above illustrative embodiments, the multi-zone reactor with multi-stage temperature control achieves graded temperature control by setting a multi-stage control valve group consisting of a first regulating valve and a second regulating valve on the jacketed pipeline and utilizing the difference in valve diameter. This significantly improves the accuracy of temperature control in the multi-zone reactor, greatly reduces temperature fluctuations, effectively reduces the risk of agglomeration caused by temperature fluctuations in the multi-zone reactor, and enhances reaction stability and production safety.

[0044] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0045] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A multi-zone reactor capable of multi-stage temperature control, characterized by, include: The multi-zone reactor body includes an ascending section and a descending section. The bottom of the ascending section is used for material fluidization reaction, and the top of the ascending section is equipped with a vortex separator for gas-solid separation, so that the separated gas enters the gas circulation through the top of the descending section. A recirculating gas compressor having an inlet and an outlet, the inlet of the recirculating gas compressor being connected to the top of the descending section, the recirculating gas compressor being used to compress recirculating gas; A reactor cooler has an inlet and an outlet. The inlet of the reactor cooler is connected to the outlet of the circulating gas compressor, and the outlet of the reactor cooler is connected to the multi-zone reactor body. A jacketed pipeline is provided on the outer periphery of the reactor cooler for introducing a cooling medium to cool the circulating gas. A multi-stage control valve assembly is provided on the jacketed pipeline. The multi-stage control valve assembly is used to control the flow rate of the cooling medium in stages to cool the circulating gas in stages.

2. The multi-zone reactor with multi-stage temperature control of claim 1, wherein, The multi-stage control valve group includes a first regulating valve and a second regulating valve, wherein the diameter of the first regulating valve is larger than that of the second regulating valve.

3. The multi-zone reactor with multi-stage temperature control of claim 2, wherein, The first regulating valve has a diameter of DN350, and the second regulating valve has a diameter of DN100.

4. The multi-zone reactor with multiple temperature control levels of claim 3, wherein, It also includes a temperature sensor and a control system. The temperature sensor is used to detect the temperature inside the multi-zone reactor body. The temperature sensor is signal-connected to the control system. The control system is electrically connected to the first regulating valve and the second regulating valve respectively, so as to control the opening degree of the first regulating valve and the second regulating valve according to the detection value of the temperature sensor.

5. The multi-zone reactor with multi-stage temperature control according to claim 4, characterized in that, Both the first regulating valve and the second regulating valve are butterfly valves.

6. The multi-zone reactor with multiple temperature control levels of claim 4, wherein, The control system is a PLC.

7. The multi-zone reactor with multi-stage temperature control according to claim 1, characterized in that, The jacketed pipeline includes an inlet branch and an outlet branch, and the multi-stage control valve assembly is located on the inlet branch or the outlet branch.

8. The multi-zone reactor with multi-stage temperature control according to claim 7, characterized in that, The inlet and outlet water branches are respectively arranged around the outer periphery of the reactor cooler to form an annular cooling channel.

9. The multi-zone reactor of claim 1, wherein, The inner wall of the jacketed pipe is provided with turbulence protrusions, which are spirally distributed along the flow direction of the cooling medium to enhance the heat exchange efficiency between the cooling medium and the reactor cooler.

10. The multi-zone reactor of claim 1, wherein, The reactor cooler is equipped with a tube assembly, and the cooling medium in the jacketed pipe exchanges heat with the circulating gas in the tube assembly through the pipe wall.

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