Solid-liquid-gas three-phase reaction backpressure discharging device

Abstract

The utility model relates to the technical field of chemical production process equipment, in particular to a solid-liquid-gas three-phase reaction backpressure discharging device which comprises a tubular reactor and a gas-liquid separation tank, a first connecting pipe is mounted at an outlet in the right side of the tubular reactor, and the outer wall of the first connecting pipe is communicated with a reaction buffer pipe; the right end of the first connecting pipe communicates with a rectangular pipe, front-stage valves are installed on the upper side and the lower side of the outer wall of the rectangular pipe correspondingly, and discharging buffer pipes located on the right sides of the two front-stage valves are installed on the upper side and the lower side of the outer wall of the rectangular pipe correspondingly. Due to the fact that the pressure in the discharging buffer pipe is higher than the external pressure, materials are discharged into the gas-liquid separation tank through the rear-stage valve, due to the fact that gas expansion is far larger than the size of the discharging buffer pipe, all the materials can be pushed out through gas expansion, and due to the fact that the front-stage valve and the rear-stage valve are in full-open and full-closed states when acting, the drift diameter of the front-stage valve and the rear-stage valve is far larger than the diameter of solid particles when the front-stage valve and the rear-stage valve are full-open. Therefore, the effect of avoiding the risk of solid blockage is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production process equipment, in particular to a back-pressure discharging device for a solid-liquid-gas three-phase reaction. Background Art

[0002] With the development of technology and the gradual improvement of requirements for chemical production environment, safety and environmental protection, continuous reaction production technology and processes are increasingly applied in the chemical field. With the development and application of equipment and process technologies, the application fields are constantly expanding, such as pharmaceuticals, fine chemicals, polymers, etc. Continuous chemical technology has brought great changes to chemical production.

[0003] 1. Integration and automation: Future chemical continuous reaction systems will be more integrated and automated, reducing manual operations and improving production efficiency and quality control.

[0004] 2. Miniaturization and micro-miniaturization: In order to improve reaction efficiency and reduce costs, chemical continuous reaction technology will develop in the direction of miniaturization and micro-miniaturization.

[0005] 3. Green environmental protection: With the enhancement of environmental protection awareness, chemical continuous reaction technology will pay more attention to green environmental protection, reducing the generation of waste and the impact on the environment.

[0006] 4. Integration with other technologies: Chemical continuous reaction technology will be combined with other technologies such as membrane separation, adsorption, extraction, etc. to improve reaction efficiency and product quality.

[0007] There are a wide variety of chemical reactions, with different reaction materials and vastly different reaction phenomena. These differences constantly pose challenges to the development of continuous technology. There are many types of continuous reactors, such as microchannel reactors, tubular reactors, CSTR reactors. Different reactor forms have different tolerance limits for solids used or generated during the reaction process. For example, a microchannel reactor can accept solids of 100 microns, a tubular reactor can tolerate solids of 500 - 1000 microns, and a CSTR can accept larger particles and a larger proportion of solid content. These reactions generally adopt an end-open discharging method, and the reaction pressure cannot be adjusted. Continuity often requires process intensification through temperature and pressure. Generally, a back-pressure valve is used for pressure control. The forms of back-pressure valves include mechanical back-pressure valves, pneumatic or hydraulic back-pressure valves. In industrial installations, pneumatic control valves are also used for interlocking back-pressure regulation.

[0008] The backpressure devices in the above forms are not applicable to material systems containing solids. The backpressure valve allows materials to pass through by the pressure difference on both sides of the valve disc. When the pressures on both sides are close to balance, the valve disc only opens to a tiny slit to allow the fluid to pass through. The smaller the fluid viscosity, the smaller the opening of the valve disc. At this time, if the diameter of the solid particles is smaller than the width of the valve disc opening, the solid substances will be intercepted, making the passage diameter narrower, thus forming a filtering effect and causing blockage in the pipeline, and serious cases may lead to safety accidents. The basic principle of the pneumatic control valve is similar. It also changes the fluid resistance by adjusting the opening size to achieve backpressure, and will encounter the same problems when encountering solid components.

[0009] In chemical reactions, situations often occur where both solids and gases participate in the reaction or are generated. This situation is more complex. The viscosity of gases is the smallest, that of liquids is the second, and solids are the most likely to be intercepted. With current technologies, it is often difficult to achieve continuous operation for this type. Therefore, it is necessary to propose a backpressure discharging device for solid-liquid-gas three-phase reactions to solve the above-mentioned problems. Summary of the Utility Model

[0010] The purpose of the present utility model is to provide a backpressure discharging device for solid-liquid-gas three-phase reactions to solve the above problems.

[0011] To achieve the above purpose, the present utility model provides the following technical solution: A backpressure discharging device for solid-liquid-gas three-phase reactions, including a tubular reactor and a gas-liquid separation tank. At the outlet on the right side of the tubular reactor, a first connecting pipe is installed. The outer wall of the first connecting pipe is communicated with a reaction buffer pipe. The right end of the first connecting pipe is communicated with a rectangular pipe. Front-stage valves are installed on both the upper and lower sides of the outer wall of the rectangular pipe. Discharge buffer pipes are installed on both the upper and lower sides of the outer wall of the rectangular pipe and are located to the right of the two front-stage valves. Rear-stage valves are installed on both the upper and lower sides of the outer wall of the rectangular pipe and are located to the right of the two discharge buffer pipes. The right side of the rectangular pipe is communicated with a first L-shaped pipe that penetrates the outer wall of the gas-liquid separation tank and extends to its bottom side;

[0012] An input mechanism is arranged on the left side of the tubular reactor.

[0013] To facilitate the transportation of materials into the tubular reactor for reaction, as a preferred embodiment of the backpressure discharging device for solid-liquid-gas three-phase reactions of the present utility model, the input mechanism includes an A-path transfer pump and a B-path transfer pump located to the left of the tubular reactor. A second connecting pipe is installed between the outlet on the right side of the A-path transfer pump and the inlet on the left side of the tubular reactor. The outlet on the right side of the B-path transfer pump is installed with a second L-shaped pipe communicated with the outer wall of the second connecting pipe.

[0014] To avoid accidents, as an optimization of the solid-liquid-gas three-phase reaction back-pressure discharging device of the present utility model, a U-shaped pipe is connected between the outer wall of the first connecting pipe to the left of the reaction buffer pipe and the outer wall of the first L-shaped pipe. A safety valve is installed on the upper side of the outer wall of the U-shaped pipe. A third connecting pipe is connected between the inner sides of the U-shaped pipe, and a pneumatic cut-off valve is installed on the outer wall of the third connecting pipe.

[0015] To facilitate improving the service life and response speed, as an optimization of the solid-liquid-gas three-phase reaction back-pressure discharging device of the present utility model, both of the two pre-stage valves and the two post-stage valves are solenoid valves.

[0016] To facilitate connecting the conveying pipelines separately, as an optimization of the solid-liquid-gas three-phase reaction back-pressure discharging device of the present utility model, flange pipes are installed at the inlets on the left sides of the A-path conveying pump and the B-path conveying pump.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] During operation, the pre-stage valve is opened and the post-stage valve is closed. The gas-liquid-solid three-phase material after reacting in the tubular reactor enters the discharge buffer pipe under the pressure of the input mechanism. After a certain interval time, the pre-stage valve is closed and the post-stage valve is opened. At this time, since the pressure in the discharge buffer pipe is higher than the external pressure, the material is discharged into the gas-liquid separation tank through the post-stage valve. Due to the expansion of the gas, which is much larger than the volume of the discharge buffer pipe, the gas expansion can push out all the materials. Since the pre-stage valve and the post-stage valve are in the fully open and fully closed states during operation, and their through-diameters are much larger than the diameter of the solid particles when fully open, the risk of solid blockage is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the overall connection structure diagram of the present utility model.

[0020] In the figure: 1. A-path conveying pump; 2. B-path conveying pump; 3. Tubular reactor; 4. Reaction buffer pipe; 5. Pre-stage valve; 6. Discharge buffer pipe; 7. Post-stage valve; 8. Gas-liquid separation tank; 9. Safety valve; 10. Pneumatic cut-off valve; 11. Second connecting pipe; 12. Second L-shaped pipe; 13. First connecting pipe; 14. Rectangular pipe; 15. First L-shaped pipe; 16. U-shaped pipe; 17. Third connecting pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Please refer to Figure 1, a backpressure discharging device for solid-liquid-gas three-phase reaction, comprising a tubular reactor 3 and a gas-liquid separation tank 8. At the outlet on the right side of the tubular reactor 3, a first connecting pipe 13 is installed. A reaction buffer pipe 4 is communicated with the outer wall of the first connecting pipe 13. The right end of the first connecting pipe 13 is communicated with a rectangular pipe 14. Front-stage valves 5 are installed on both the upper and lower sides of the outer wall of the rectangular pipe 14. Discharge buffer pipes 6 are installed on both the upper and lower sides of the outer wall of the rectangular pipe 14 and are located to the right of the two front-stage valves 5. Rear-stage valves 7 are installed on both the upper and lower sides of the outer wall of the rectangular pipe 14 and are located to the right of the two discharge buffer pipes 6. The right side of the rectangular pipe 14 is communicated with a first L-shaped pipe 15 that penetrates the outer wall of the gas-liquid separation tank 8 and extends to its bottom side;

[0022] An input mechanism is arranged on the left side of the tubular reactor 3.

[0023] In this embodiment: During operation, the front-stage valve 5 is opened and the rear-stage valve 7 is closed. The gas-liquid-solid three-phase material after reaction in the tubular reactor 3 enters the discharge buffer pipe 6 under the pressure of the input mechanism. After a certain interval time, the front-stage valve 5 is closed and the rear-stage valve 7 is opened. At this time, since the pressure in the discharge buffer pipe 6 is higher than the external pressure, the material is discharged into the gas-liquid separation tank 8 through the rear-stage valve. Due to the expansion of the gas, which is much larger than the volume of the discharge buffer pipe 6, the gas expansion can push out all the materials;

[0024] This device uses a PLC or DCS system to control the alternating operation of the front-stage valve 5 and the rear-stage valve 7 and the time interval is controlled by a program, and is interlocked with the system pressure. When the system pressure is higher than the set pressure, the time interval of the alternating operation is reduced and the discharge frequency is increased. When the system pressure is less than the set value, the alternating operation interval time is extended to reduce the discharge frequency and maintain the system pressure;

[0025] Since the front-stage valve 5 and the rear-stage valve 7 are in the fully open and fully closed states during operation, and their through diameters are much larger than the solid particle diameter when fully open, the risk of solid blockage is avoided.

[0026] As a technical optimization scheme of the present utility model, the input mechanism comprises an A-path transfer pump 1 and a B-path transfer pump 2 located on the left side of the tubular reactor 3. A second connecting pipe 11 is installed between the outlet on the right side of the A-path transfer pump 1 and the inlet on the left side of the tubular reactor 3. A second L-shaped pipe 12 is installed at the outlet on the right side of the B-path transfer pump 2 and is communicated with the outer wall of the second connecting pipe 11.

[0027] In this embodiment: By setting the A-path transfer pump 1 and the B-path transfer pump 2 and connecting the second L-shaped pipe 12 with the second connecting pipe 11, the material is conveyed into the tubular reactor 3 for reaction.

[0028] As a technical optimization solution of the present utility model, a U-shaped pipe 16 is connected between the outer wall of the first connecting pipe 13 on the left of the reaction buffer pipe 4 and the outer wall of the first L-shaped pipe 15. A safety valve 9 is installed on the upper side of the outer wall of the U-shaped pipe 16. A third connecting pipe 17 is connected between the inner sides of the U-shaped pipe 16, and a pneumatic cut-off valve 10 is installed on the outer wall of the third connecting pipe 17.

[0029] In this embodiment: Since all hardware facilities have a certain risk of failure, when the current-stage valve 5 and the post-stage valve 7 are damaged and cannot be opened, the system pressure will continue to rise. When the system pressure reaches the high alarm value, the system opens the pneumatic cut-off valve 10. When the system pressure still rises to the design pressure of the safety valve 9, it automatically relieves pressure to avoid accidents.

[0030] As a technical optimization solution of the present utility model, both the two pre-stage valves 5 and the two post-stage valves 7 are solenoid valves.

[0031] In this embodiment: By setting both the pre-stage valve 5 and the post-stage valve 7 as solenoid valves, due to the long-term operation of the continuous reaction, solenoid valves with long service life are preferred. The general service life of solenoid valves can reach hundreds of thousands or even millions of operations, and the response speed is fast.

[0032] As a technical optimization solution of the present utility model, flange pipes are installed at the inlets on the left sides of the A-path delivery pump 1 and the B-path delivery pump 2.

[0033] In this embodiment: By providing two flange pipes, it is convenient to connect the conveying pipelines respectively.

[0034] Working principle: During operation, the materials are conveyed into the tubular reactor 3 through the second L-shaped pipe 12 and the second connecting pipe 11 by the A-path delivery pump 1 and the B-path delivery pump 2 for reaction. The pre-stage valve 5 is opened and the post-stage valve 7 is closed. The gas-liquid-solid three-phase materials after reaction in the tubular reactor 3 enter the discharge buffer pipe 6 under pressure. After a certain interval of time, the pre-stage valve 5 is closed and the post-stage valve 7 is opened. At this time, since the pressure in the discharge buffer pipe 6 is higher than the external pressure, the materials are discharged into the gas-liquid separation tank 8 through the post-stage valve. Due to the expansion of the gas, which is much larger than the volume of the discharge buffer pipe 6, the gas expansion can push out all the materials;

[0035] This device uses a PLC or DCS system to control the alternating operation of the pre-stage valve 5 and the post-stage valve 7, and the time interval is controlled by a program. It is also interlocked with the system pressure. When the system pressure is higher than the set pressure, the time interval of the alternating operation is reduced and the discharge frequency is increased. When the system pressure is lower than the set value, the alternating operation interval time is extended and the discharge frequency is reduced to maintain the system pressure;

[0036] Since the pre-stage valve 5 and the post-stage valve 7 are in the fully open and fully closed states during operation, and their through diameters are much larger than the solid particle diameters when fully open, the risk of solid blockage is avoided;

[0037] Since there is a certain risk of failure for all hardware facilities, when the current-stage valve 5 and the post-stage valve 7 are damaged and cannot be opened, the system pressure will continue to rise. When it reaches the high-alarm value, the system opens the pneumatic cut-off valve 10. When the system pressure still rises to the design pressure of the safety valve 9, it automatically relieves pressure to avoid accidents.

[0038] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A solid-liquid-gas three-phase reaction back pressure discharge device, comprising a tubular reactor (3) and a gas-liquid separation tank (8), characterized in that: A first connecting pipe (13) is installed at the outlet on the right side of the tubular reactor (3); the outer wall of the first connecting pipe (13) is connected to a reaction buffer pipe (4); the right end of the first connecting pipe (13) is connected to a rectangular pipe (14); front-stage valves (5) are installed on both upper and lower sides of the outer wall of the rectangular pipe (14); discharge buffer pipes (6) located on the right side of the two front-stage valves (5) are installed on both upper and lower sides of the outer wall of the rectangular pipe (14); rear-stage valves (7) located on the right side of the two discharge buffer pipes (6) are installed on both upper and lower sides of the outer wall of the rectangular pipe (14); and the right side of the rectangular pipe (14) is connected to a first L-shaped pipe (15) that penetrates the outer wall of the gas-liquid separation tank (8) and extends to the bottom side thereof; An input mechanism is arranged on the left side of the tubular reactor (3).

2. A solid-liquid-gas three-phase reaction back pressure discharge device according to claim 1, characterized in that: The input mechanism comprises an A-line delivery pump (1) and a B-line delivery pump (2) located on the left side of the tubular reactor (3); a second connecting pipe (11) is installed between the outlet on the right side of the A-line delivery pump (1) and the inlet on the left side of the tubular reactor (3); and a second L-shaped pipe (12) connected to the outer wall of the second connecting pipe (11) is installed at the outlet on the right side of the B-line delivery pump (2).

3. A solid-liquid-gas three-phase reaction back pressure discharge device according to claim 1, characterized in that: A U-shaped pipe (16) is connected between the outer wall of the first connecting pipe (13) located on the left side of the reaction buffer pipe (4) and the outer wall of the first L-shaped pipe (15), a safety valve (9) is installed on the upper side of the outer wall of the U-shaped pipe (16), and a third connecting pipe (17) is connected between the inner sides of the U-shaped pipe (16), and a pneumatic shut-off valve (10) is installed on the outer wall of the third connecting pipe (17).

4. A solid-liquid-gas three-phase reaction back pressure discharge device according to claim 1, characterized in that: The two front-stage valves (5) and the two rear-stage valves (7) are all solenoid valves.

5. The solid-liquid-gas three-phase reaction back pressure discharge device according to claim 2, characterized in that: Flange pipes are installed at the inlets on the left sides of the A-route delivery pump (1) and the B-route delivery pump (2).

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