Multiphase system continuous reaction system

Abstract

The utility model discloses a kind of multi-phase state system continuous reaction systems, belong to reactor technical field.Its technical scheme includes reaction unit, pressure stabilizing unit, heat exchange unit and controller;Reaction unit includes tubular reactor, and pressure stabilizing unit includes pressure stabilizing tank;Heat exchange unit includes heat exchange medium discharge pipeline and heat exchange medium feed pipeline, cooling coil and cooling coil connects cooling coil feed pipeline and cooling coil discharge pipeline;Tubular reactor includes cylinder and stirring mechanism, the cylinder includes inner cylinder and outer cylinder, outer cylinder is sleeved in the outside of inner cylinder, and outer heat exchange cavity is formed between inner cylinder and outer cylinder, outer heat exchange cavity is provided with outer heat exchange medium inlet and outer heat exchange medium outlet, and reaction cavity is provided in inner cylinder, and the stirring mechanism is arranged in reaction cavity;The utility model can realize the multi-phase state reaction system of efficient mixing, accurate temperature control, reliable sealing and continuous operation.

Description

Technical Field

[0001] This invention belongs to the field of reactor technology, specifically relating to a continuous reaction system for a multiphase system. Background Technology

[0002] In multiphase chemical reactions (such as gas-liquid-solid reactions), the reaction system often involves uneven material distribution and exothermic / endothermic effects, leading to low reaction efficiency and unstable product quality. In existing technologies, continuous reaction systems often employ stirred tanks or fixed-bed reactors, but these suffer from difficulties in quickly removing or replenishing reaction heat, resulting in localized overheating or undercooling, affecting reaction selectivity and yield. Furthermore, the agitator shaft seal is prone to failure due to high temperatures or wear, causing leaks or safety accidents. Continuous operation is also challenging: material feeding and discharging are unstable, and large system pressure fluctuations affect reaction stability. Therefore, a multiphase reaction system capable of achieving efficient mixing, precise temperature control, and reliable sealing is needed. Utility Model Content

[0003] This invention provides a continuous reaction system for a multiphase system, which can achieve efficient mixing, precise temperature control, and reliable sealing.

[0004] The technical solution of this utility model is as follows: A multiphase continuous reaction system includes a reaction unit, a pressure stabilizing unit, a heat exchange unit, and a controller; The reaction unit includes a tubular reactor, the pressure stabilizing unit includes a pressure stabilizing tank, and the heat exchange unit includes a heat exchange medium discharge pipeline, a heat exchange medium inlet pipeline, a cooling coil, and a cooling coil inlet pipeline and a cooling coil outlet pipeline connecting the cooling coil. The tubular reactor includes a cylindrical body and a stirring mechanism. The cylindrical body includes an inner cylindrical body and an outer cylindrical body. The outer cylindrical body is sleeved on the outside of the inner cylindrical body, forming an external heat exchange cavity between the inner and outer cylindrical bodies. The external heat exchange cavity is provided with an external heat exchange medium inlet and an external heat exchange medium outlet. A reaction cavity is provided inside the inner cylindrical body, and the stirring mechanism is provided inside the reaction cavity. The tubular reactor is equipped with a solid material inlet, a liquid / gas material inlet, a material outlet, a residual material outlet, and a pressure sensor, which is electrically connected to the controller. One end of the stirring mechanism extends out of the reaction chamber and is connected to a drive motor. The drive motor is driven by a gear set. The output shaft of the drive motor is connected to the stirring shaft. The stirring shaft is equipped with stirring blades. A mechanical seal is used between the stirring shaft and the outer cylinder. The mechanical seal is equipped with a heat exchange inlet and a heat exchange outlet. The pressure stabilizing tank is equipped with a temperature sensor, a liquid level sensor, and a second pressure sensor. All three sensors are electrically connected to the controller. The pressure stabilizing tank contains a heat exchange medium. The tank body is equipped with a heat exchange medium discharge pipeline and a heat exchange medium inlet pipeline. The heat exchange medium discharge pipeline is equipped with a circulation pump. Both the heat exchange medium discharge pipeline and the heat exchange medium inlet pipeline are equipped with solenoid valves, which are electrically connected to the controller. The heat exchange medium discharge pipeline and the heat exchange medium inlet pipeline are respectively connected to the heat exchange inlet and heat exchange outlet of the mechanical seal of the tubular reactor. The pressure stabilizing tank is equipped with a cooling coil, which is connected to the cooling coil feed pipe and the cooling coil discharge pipe. The top of the pressure stabilizing tank is also equipped with an air source inlet, which is connected to an external air source through an air inlet pipe. The air inlet pipe is equipped with an air inlet valve, which is electrically connected to the controller. The top of the pressure stabilizing tank is also equipped with a pressure stabilizing air outlet pipe, which is equipped with an exhaust valve, and the exhaust valve is electrically connected to the controller.

[0005] Preferably, the air intake line is also connected to a purge line via a branch line for purging and cleaning the tubular reactor when the system is shut down or under maintenance.

[0006] Preferably, the stirring blade is one of a spiral stirring blade, a finned blade, or a ribbon blade.

[0007] Preferably, the connecting pipeline between the heat exchange outlet of the mechanical seal and the pressure stabilizing tank is further equipped with a temperature control valve, which is electrically connected to the controller.

[0008] Preferably, it also includes a solid feeder connected to the top of the solid material inlet. The solid feeder is mounted on the top of the tubular reactor via a fixed frame. The solid feeder includes a hopper and a screw feeder. A hopper cover is provided on the top of the hopper cover, and a mixing motor is installed through the top of the hopper cover. The output shaft of the mixing motor is connected to a mixing shaft, and the mixing shaft is provided with mixing blades. A discharge pipe is provided at the bottom of the hopper, and a feed port is provided at the upper end of the screw feeder. The discharge pipe is connected to the feed port. A feed motor is provided at one end of the screw feeder and is driven by the feed motor. The other end of the screw feeder is connected to the solid material inlet.

[0009] Compared with the prior art, this utility model has the following advantages: 1. This invention employs an independent cooling system with an external heat exchange chamber and a mechanical seal, combined with the heat exchange medium in a pressure stabilizing tank, ensuring a constant temperature environment for the reaction system and improving reaction selectivity and yield. The purge pipeline and inert gas source design facilitate system cleaning and shutdown maintenance, reducing safety risks.

[0010] 2. The tubular reactor uses a pressure stabilizing tank to maintain the pressure balance inside and outside the tubular reactor, ensuring the normal operation of the mechanical seal and preventing temperature rise and wear caused by its own rotational friction, as well as the failure, leakage or damage of the mechanical seal's dynamic and static ring seals due to excessive internal and external pressure difference.

[0011] 3. An external heat exchange chamber is provided on the outside of the reaction chamber to conduct the heat generated during the reaction process of the materials in the reaction chamber away in a timely manner, and the heat exchange efficiency is greatly improved compared with conventional pipeline reactors and batch reactors.

[0012] 4. The feed inlet of the reaction chamber is equipped with a solid material inlet. When used in conjunction with a solid feeder, it can realize the direct feeding of solid materials for continuous reaction without the need for solvent to dissolve or dilute the solid materials. This achieves a solvent-free continuous solid reaction process, produces no solvent waste liquid, reduces costs and increases efficiency, and reduces environmental pressure. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the structure of the tubular reactor of this utility model.

[0015] Figure 3 This is the structural assembly drawing of this utility model.

[0016] Figure 4 This is a structural assembly drawing of the present invention with a feeder.

[0017] Figure 5 This is a cross-sectional view of the solid feeder of this utility model.

[0018] Figure 6 This is a perspective view of the solid feeder of this utility model.

[0019] In the diagram, 1. Pressure stabilizing tank; 2. Tubular reactor; 201. Shell; 202. Stirring mechanism; 203. Reaction chamber; 204. Solid material inlet; 205. Liquid / gas material inlet; 206. Material outlet; 207. Residual material outlet; 208. Drive motor; 209. Stirring shaft; 210. Mechanical seal; 211. Gas source inlet; 3. External heat exchange medium inlet; 4. External heat exchange medium outlet; 5. Heat exchange medium discharge pipeline; 6. Heat exchange medium feed pipeline; 7. Cooling coil feed pipeline; 8. Cooling coil discharge pipeline; 9. Purge pipeline; 10. Solid feeder; 1001. Hopper; 1002. Hopper cover; 1003. Mixing motor; 1004. Mixing shaft; 1005. Mixing blade; 1006. Feeding motor; 11. Fixing frame; 12. Screw feeder. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model.

[0021] Example 1 like Figure 1-6 As shown, this embodiment provides a continuous reaction system for a multiphase system, including a reaction unit, a pressure stabilizing unit, a heat exchange unit, and a controller; the reaction unit includes a tubular reactor 2, the pressure stabilizing unit includes a pressure stabilizing tank 1; the heat exchange unit includes a heat exchange medium discharge pipe 5, a heat exchange medium inlet pipe 6, a cooling coil, and a cooling coil inlet pipe 7 and a cooling coil outlet pipe 8; The tubular reactor 2 includes a cylindrical body 201 and a stirring mechanism 202. The cylindrical body 201 includes an inner cylindrical body and an outer cylindrical body. The outer cylindrical body is sleeved on the outside of the inner cylindrical body, forming an external heat exchange cavity between the inner and outer cylindrical bodies. The external heat exchange cavity is provided with an external heat exchange medium inlet 3 and an external heat exchange medium outlet 4. A reaction chamber 203 is provided inside the inner cylindrical body, and the stirring mechanism 202 is provided inside the reaction chamber 203. The tubular reactor 2 is equipped with a solid material inlet 204, a liquid / gas material inlet 205, a material outlet 206, a residual material outlet 207, and a pressure sensor 1, which is electrically connected to the controller. It also includes a solid feeder 10 connected to the top of the solid material inlet 204. The solid feeder 10 is mounted on the top of the tubular reactor 2 via a mounting bracket 11. The solid feeder 10 includes a hopper 1001 and a screw feeder 12. The top of the hopper 1001 is equipped with a hopper cover 1002. A mixing motor 1003 is installed through the top of the hopper cover 1002. The output shaft of the mixing motor 1003 is connected to a mixing shaft 1004, and the mixing shaft 1004 is equipped with mixing blades 1005. A discharge pipe is provided at the bottom of the hopper 1001. A feed inlet is provided at the upper end of the screw feeder 12. The discharge pipe is connected to the feed inlet. A feed motor 1006 is provided at one end of the screw feeder 12 and is driven by the feed motor 1006. The other end of the screw feeder 12 is connected to the solid material inlet 204. One end of the stirring mechanism 202 extends out of the reaction chamber 203 and is connected to a drive motor 208. The drive motor 208 is driven by a gear set. The output shaft of the drive motor 208 is connected to the stirring shaft 209. The stirring shaft 209 is equipped with stirring blades. The stirring blades are spiral stirring blades. A mechanical seal 210 is used between the stirring shaft 209 and the outer cylinder. The mechanical seal 210 is equipped with a heat exchange inlet and a heat exchange outlet. The pressure stabilizing tank 1 is equipped with a temperature sensor, a liquid level sensor, and a second pressure sensor. All three sensors are electrically connected to the controller. The pressure stabilizing tank 1 contains a heat exchange medium. The tank body of the pressure stabilizing tank 1 is equipped with a heat exchange medium discharge pipe 5 and a heat exchange medium inlet pipe 6. The heat exchange medium discharge pipe 5 is equipped with a circulation pump. Both the heat exchange medium discharge pipe 5 and the heat exchange medium inlet pipe 6 are equipped with solenoid valves, which are electrically connected to the controller. The heat exchange medium discharge pipe 5 and the heat exchange medium inlet pipe 6 are respectively connected to the heat exchange inlet and heat exchange outlet of the mechanical seal 210 of the tubular reactor 2. The pressure stabilizing tank 1 is equipped with a cooling coil, which is connected to the cooling coil inlet pipe 7 and the cooling coil outlet pipe 8. The top of the pressure stabilizing tank 1 is also equipped with an air source inlet 211, which is connected to an external air source through an air inlet pipe. The air inlet pipe is equipped with an air inlet valve, which is electrically connected to the controller. The pressure stabilizing tank 1 is also equipped with a pressure stabilizing gas outlet pipeline at the top, and an exhaust valve is installed on the pressure stabilizing gas outlet pipeline. The exhaust valve is electrically connected to the controller. The gas inlet pipeline is also connected to a purge pipeline 9 through a branch. The purge pipeline 9 is used to purge and clean the tubular reactor 2 when the system is shut down or under maintenance.

[0022] The connection pipeline between the heat exchange outlet of the mechanical seal 210 and the pressure stabilizing tank 1 is also equipped with a temperature control valve, which is electrically connected to the controller.

[0023] The mechanical seal 210 is a commercially available double-end mechanical seal. A temperature sensor is installed on the outside of the mechanical seal 210, and the temperature sensor is electrically connected to the controller. The temperature sensor, liquid level sensor, and pressure sensor in the pressure stabilizing tank 1, together with the temperature sensor on the outside of the mechanical seal 210, constitute a temperature monitoring system, which is linked with the valves of the circulating pump, solenoid valve, temperature control valve, and cooling coil feed pipe 7.

[0024] The heat exchange medium contained in the pressure stabilizing tank 1 is preferably heat transfer oil, and its temperature is regulated by a built-in cooling coil: when the temperature sensor of the pressure stabilizing tank 1 detects that the temperature of the heat exchange medium is higher than a set threshold (this threshold is determined according to the optimal operating temperature of the mechanical seal 210), the controller receives the temperature signal and automatically opens the valve of the cooling coil feed pipe 7, allowing a low-temperature cooling medium, such as cooling water, to enter the cooling coil; the cooling medium exchanges heat with the heat exchange medium in the pressure stabilizing tank within the coil, absorbs heat, and is then discharged from the cooling coil discharge pipe 8; when the temperature sensor detects that the temperature of the heat exchange medium drops to the set lower limit, the controller closes the valve of the cooling coil feed pipe 7, stopping cooling. Simultaneously, the liquid level sensor of the pressure stabilizing tank 1 monitors the liquid level of the heat exchange medium in real time. When the liquid level is lower than the set value, heat exchange medium is added; when the liquid level reaches the set upper limit, adding is stopped, ensuring a stable total amount of heat exchange medium and providing a continuous and stable medium source for the heat exchange of the mechanical seal 210.

[0025] When the mechanical seal 210 generates heat due to the friction of the rotating agitator shaft 209, causing its temperature to rise, the temperature sensor attached to the mechanical seal 210 transmits the temperature signal to the controller; the controller further opens the valve of the cooling coil feed pipe 7 to reduce the temperature of the heat exchange medium in the pressure tank and enhance heat dissipation through the circulation of the low-temperature medium.

[0026] Work process: Solid materials are dispersed in the hopper 1001 by the stirring action of the mixing shaft 1004 to prevent clumping. Conveyed by the screw feeder 12, they are continuously added to the reaction chamber 203 of the tubular reactor 2 through the solid material inlet 204. The screw feeder 12 is a commercially available common structure. Liquid or gaseous materials enter through the liquid / gas material inlet 205. The drive motor 208 drives the stirring shaft 209 to rotate via a gear set, ensuring thorough mixing of the materials. Heat exchange, whether exothermic or endothermic, occurs through an external heat exchange medium, such as heat transfer oil, in the external heat exchange chamber. The external heat exchange medium enters through the external heat exchange medium inlet 3 and flows out through the external heat exchange medium outlet 4, circulating through the external heat exchanger for temperature control. Temperature, level, and pressure sensors in the pressure stabilizing tank 1 monitor data in real time. The controller adjusts the air inlet valve, circulating pump, and cooling coil based on the data. For example, when the temperature is too high, cooling water is introduced into the cooling coil to lower the temperature; when the pressure is too low, the air inlet valve is opened to replenish gas. The reacted material is continuously discharged from the material outlet 206, while residual material, such as catalyst or solid residue, is periodically discharged from the residual material outlet 207. When the system is shut down, inert gas is introduced through the purging pipeline 9 to clean the reaction chamber 203 and the pipeline, preventing material residue or oxidation.

[0027] The specific pressure adjustment method for mechanical seal 210 is as follows: During the pressurization process, when the pressure difference between the pressure in pressure tank 1 (P2) and the reactor pressure (P1) is less than the first set value, the inlet valve opens, and pressure tank 1 is filled with nitrogen. When the pressure difference between pressure tank 1 (P2) and the reactor pressure (P1) equals the second set value, the inlet valve closes, and the exhaust valve also closes. During the depressurization process (when the pressure difference between pressure tank 1 (P2) and the reactor pressure (P1) is greater than the second set value), the exhaust valve opens, and pressure tank 1 discharges nitrogen. During the stabilization process (when the pressure difference between pressure tank 1 (P2) and the reactor pressure (P1) is between the first and second set values), both valves close simultaneously. When the pressure difference between pressure tank 1 (P2) and the reactor pressure (P1) is less than the first set value, the inlet valve reopens, and pressure tank 1 is filled with nitrogen. When the pressure difference between pressure tank 1 (P2) and the reactor pressure (P1) equals the second set value, pressure replenishment stops. Throughout the entire process, the pressure difference between pressure tank 1 (P2) and the reactor pressure (P1) is maintained at ≥0 MPa to prevent leakage of the reaction liquid into pressure tank 1.

[0028] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, it is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and all such modifications or substitutions should be within the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A continuous reaction system for a multiphase system, characterized in that, It includes a reaction unit, a pressure stabilizing unit, a heat exchange unit, and a controller; the reaction unit includes a tubular reactor (2), the pressure stabilizing unit includes a pressure stabilizing tank (1); the heat exchange unit includes a heat exchange medium discharge pipeline (5), a heat exchange medium inlet pipeline (6), a cooling coil, and a cooling coil inlet pipeline (7) and a cooling coil outlet pipeline (8). The tubular reactor (2) includes a cylindrical body (201) and a stirring mechanism (202). The cylindrical body (201) includes an inner cylindrical body and an outer cylindrical body. The outer cylindrical body is sleeved on the outside of the inner cylindrical body, forming an external heat exchange cavity between the inner cylindrical body and the outer cylindrical body. The external heat exchange cavity is provided with an external heat exchange medium inlet (3) and an external heat exchange medium outlet (4). The inner cylindrical body is provided with a reaction cavity (203), and the stirring mechanism (202) is provided in the reaction cavity (203). The tubular reactor (2) is equipped with a solid material inlet (204), a liquid / gas material inlet (205), a material outlet (206), a residual material outlet (207), and a pressure sensor, which is electrically connected to the controller. The stirring mechanism (202) extends out of the reaction chamber (203) at one end and is connected to a drive motor (208). The drive motor (208) is driven by a gear set. The output shaft of the drive motor (208) is connected to the stirring shaft (209). The stirring shaft (209) is equipped with stirring blades. A mechanical seal (210) is used between the stirring shaft (209) and the outer cylinder. The mechanical seal (210) is equipped with a heat exchange inlet and a heat exchange outlet. The pressure stabilizing tank (1) is equipped with a temperature sensor, a liquid level sensor and a pressure sensor II. The temperature sensor, liquid level sensor and pressure sensor II are all electrically connected to the controller. The pressure stabilizing tank (1) contains a heat exchange medium. The tank body of the pressure stabilizing tank (1) is equipped with a heat exchange medium discharge pipe (5) and a heat exchange medium inlet pipe (6). The heat exchange medium discharge pipe (5) is equipped with a circulation pump. The heat exchange medium discharge pipe (5) and the heat exchange medium inlet pipe (6) are both equipped with solenoid valves. The solenoid valves are electrically connected to the controller. The heat exchange medium discharge pipe (5) and the heat exchange medium inlet pipe (6) are respectively connected to the heat exchange inlet and heat exchange outlet of the mechanical seal (210) of the tubular reactor (2). The pressure stabilizing tank (1) is equipped with a cooling coil. The cooling coil is connected to the cooling coil feed pipe (7) and the cooling coil discharge pipe (8). The pressure stabilizing tank (1) is also equipped with an air source inlet (211). The air source inlet (211) is connected to an external air source through an air inlet pipe. The air inlet pipe is equipped with an air inlet valve, which is electrically connected to the controller. The pressure stabilizing tank (1) is also equipped with a pressure stabilizing gas outlet pipeline at the top, and an exhaust valve is installed on the pressure stabilizing gas outlet pipeline. The exhaust valve is electrically connected to the controller.

2. The multiphase continuous reaction system as described in claim 1, characterized in that, The intake pipe is also connected to a purge pipe (9) via a branch line.

3. The multiphase continuous reaction system as described in claim 1, characterized in that, The stirring blades are one of the following: spiral stirring blades, finned blades, and ribbon blades.

4. The multiphase continuous reaction system as described in claim 1, characterized in that, The connection pipeline between the heat exchange outlet of the mechanical seal (210) and the pressure stabilizing tank (1) is also equipped with a temperature control valve, which is electrically connected to the controller.

5. The multiphase continuous reaction system as described in claim 1, characterized in that, It also includes a solid feeder (10) connected to the top of the solid material inlet (204). The solid feeder (10) is set on the top of the tubular reactor (2) by a fixing frame (11). The solid feeder (10) includes a hopper (1001) and a screw feeder (12). A hopper cover (1002) is provided on the top of the hopper (1001). A mixing motor (1003) is provided through the top of the hopper cover (1002). The output shaft of 003 is connected to a mixing shaft (1004), and the mixing shaft (1004) is provided with mixing blades (1005); the bottom of the hopper (1001) is provided with a discharge pipe, the upper end of the screw feeder (12) is provided with a feed port, the discharge pipe is connected to the feed port, one end of the screw feeder (12) is provided with a feed motor (1006) and driven by the feed motor (1006), and the other end of the screw feeder (12) is connected to a solid material inlet (204).

Images