Corrosion-resistant reaction kettle convenient for cyclic heating

Abstract

The invention discloses a corrosion-resistant reaction kettle convenient for cyclic heating, and belongs to the technical field of reaction kettles.The corrosion-resistant reaction kettle comprises a kettle body, a stirring device, a first circulating pump and a heater, the heater comprises a shell, a working pipe, a heat insulation layer and an electromagnetic induction coil, one end of the working pipe is communicated with the first circulating pump, and the other end of the working pipe is communicated with the kettle body; when the electromagnetic induction coil works, liquid in the working pipe is heated through the working pipe. Liquid materials in the working pipe are heated through electromagnetic induction, the heating efficiency is high, circulating heating is achieved, the liquid materials in the kettle body can be evenly heated under the condition that stirring is not needed, energy is saved, and consumption is reduced; two heating modes are integrated on one heater, one heating mode is electromagnetic heating, the other heating mode is heat exchange, liquid materials in the kettle body can be conveniently heated through heat of external heating media such as external steam, water, heat conduction oil or smoke in the heat exchange state, the steel lining plastic reaction kettle can be conveniently used in places under various conditions, and the application range of the steel lining plastic reaction kettle is widened.

Description

Technical Field

[0001] The invention belongs to the technical field of reactors, and in particular relates to a corrosion-resistant reactor which is convenient for cyclic heating. Background Art

[0002] Reactors are widely used in the fields of petroleum, chemical industry, rubber, pesticide, dye, medicine and food. They are pressure vessels used to complete processes such as vulcanization, nitration, hydrogenation, hydrocarbonization, polymerization and condensation. According to the material of the reactor body, they can be divided into carbon steel reactors, stainless steel reactors, enamel reactors, steel-lined plastic reactors, etc. Among them, the steel-lined plastic reactor is a steel reactor with an inner lining attached to the inner surface. The inner lining is made of high-performance polymer materials such as polyethylene, polypropylene, polytetrafluoroethylene, etc. It can effectively resist the erosion of various corrosive media, has good acid and alkali resistance, can operate in harsh environments such as acid, alkali, salt, etc., and has good mechanical strength. It is often used as a corrosion-resistant reactor. There are usually two ways to heat the liquid material in the steel-lined plastic reactor. One is to set a jacket outside the reactor body and use the high-temperature medium in the jacket to heat the material in the reactor body. However, this method is not effective in heating the material in the reactor body because the reactor body is also equipped with a plastic lining, and the lining has poor thermal conductivity. The second method is to set a heating pipe that enters the reactor body on the reactor body. The heating pipe adopts an electric heating pipe or a steam heating pipe, etc., and the heating pipe is used to directly contact the liquid material in the reactor body for heating. This heating method is that the high-temperature pipe wall is in direct contact with the liquid material. The liquid material that is in direct contact with the pipe wall for a long time is prone to overheating. The mixer needs to be stirred during heating. The rotating material driven by the mixer will impact the heating pipe wall and affect the service life of the heating pipe. At the same time, in the industrial environment where some reactors are used, other equipment produces media with high thermal energy such as oil steam, thermal oil, hot water or waste flue gas. The steel-lined reactor cannot effectively utilize the heat energy of these media, which limits the scope of use of the steel-lined reactor. Summary of the invention

[0003] In view of the above problems existing in the prior art, the technical problem to be solved by the present invention is to provide a corrosion-resistant reactor that is convenient for cyclic heating to efficiently and evenly heat the liquid material in the reactor body.

[0004] Technical solution: In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0005] A corrosion-resistant reactor convenient for circulation heating comprises a reactor body, a stirring device arranged on the reactor body, a first circulation pump connected to the reactor body and a heater connected to the first circulation pump, the heater comprises a shell, a working tube arranged in the shell, a heat insulation layer arranged outside the shell and an electromagnetic induction coil wound outside the heat insulation layer, one end of the working tube is connected to the circulation pump, and the other end is connected to the reactor body, and the electromagnetic induction coil heats the liquid in the working tube through the working tube when working.

[0006] Preferably, tube sheets are connected to both ends of the shell, the working tube is connected between the two tube sheets, a head is connected to the tube sheet, a first connecting port pipe connected to the working tube is provided on the head, a accommodating cavity is provided in the shell, and a second medium inlet pipe and a second medium outlet pipe connected to the accommodating cavity are provided on the shell.

[0007] Preferably, a jacket is provided on the outer wall of the kettle body, an inlet pipe and an outlet pipe are provided on the jacket, and the inlet pipe is connected to the second medium outlet pipe through a second circulation pump.

[0008] Preferably, a first temperature sensor is provided on the first communication port pipe, and a second temperature sensor is provided on the second medium outlet pipe.

[0009] Preferably, a first feed pipe and a first discharge pipe are provided on the kettle body, and a third temperature sensor is also provided on the kettle body.

[0010] Preferably, the stirring device comprises a stirring motor disposed on the top of the kettle body, a connecting shaft connected to the stirring motor, and a stirring paddle disposed on the connecting shaft.

[0011] Preferably, a first corrosion-resistant layer is provided on the inner wall of the kettle body, and a second corrosion-resistant layer is provided on the outer wall of the connecting shaft and the stirring paddle.

[0012] Preferably, there is more than one working tube.

[0013] Preferably, the first communicating port pipe is connected to the kettle body through a second communicating pipe, and the second communicating pipe is provided with a second discharge pipe.

[0014] Preferably, the heater includes a first heating mode and a second heating mode;

[0015] In the first heating mode, the outlet pipe is connected to the second medium inlet pipe, the second medium circulates between the jacket and the containing chamber, the electromagnetic induction coil works, and the working pipe heats the liquid in the working pipe and the second medium in the containing chamber;

[0016] In the second heating mode, the second medium inlet pipe is connected to an external heating medium, and the external heating medium exchanges heat with the liquid in the working tube to heat the liquid in the working tube. The external heating medium is steam, water, heat transfer oil or flue gas.

[0017] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0018] 1. A heater is arranged outside the kettle body and connected to the kettle body. The heater includes an electromagnetic induction coil and a working tube. The first circulation pump circulates the liquid material in the kettle body to the working tube of the heater. The liquid material in the working tube is heated by electromagnetic induction. The heating efficiency is high and the circulating heating can evenly heat the liquid material in the kettle body without stirring, thereby saving energy and reducing consumption.

[0019] 2. The heater is set outside the kettle body. When the stirring device is working, the rotating liquid will not cause impact on the working tube, which increases the service life of the heater. The heater is set outside, the liquid is separated from the circuit, and it is easy to inspect and maintain;

[0020] 3. A containing cavity is formed in the shell of the heater, and a jacket communicating with the containing cavity is provided outside the kettle body. When the electromagnetic induction coil on the heater is working, it can heat the medium in the containing cavity, and the medium circulates between the containing cavity and the jacket, thus forming a good heat preservation for the kettle body;

[0021] 4. Two heating modes are integrated on one heater, one is electromagnetic heating and the other is heat exchange. In the heat exchange state, it is convenient to use the heat of external heating media such as external steam, water, heat transfer oil or flue gas to heat the liquid material in the kettle. It is suitable for a variety of usage scenarios and is easy to use in places under various conditions, thereby improving the adaptability of steel-lined plastic reactors. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0023] Figure 2 1 is a schematic diagram of the internal structure of the heater of the embodiment;

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of the shell and the working tube;

[0025] Figure 4 It is a schematic diagram of the cross-sectional structure of the first corrosion-resistant layer. DETAILED DESCRIPTION

[0026] The present invention is further illustrated below in conjunction with specific examples. The examples are implemented based on the technical solutions of the present invention. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0027] like Figure 1 As shown, a corrosion-resistant reactor convenient for circulating heating in this embodiment includes a reactor body 1, a stirring device 2, a first circulating pump 3 and a heater 4. A first feeding pipe 11 is provided on the top of the reactor body 1, the bottom of the reactor body 1 is a round bottom, and a first discharging pipe 12 is provided at the central position of the bottom. The stirring device 2 is arranged on the reactor body 1, and the stirring device 2 includes a stirring motor 21, a reducer, a connecting shaft 22 and a stirring paddle 23. The stirring motor 21 is arranged at the central position of the top of the reactor body 1, the reducer is connected to the stirring motor 21, the top end of the connecting shaft 22 is connected to the reducer, and the lower end of the connecting shaft 22 passes through the top of the reactor body 1 to reach the inside of the reactor body 1. The stirring paddle 23 is arranged on the connecting shaft 22, and the stirring motor 21 drives the stirring paddle 23 to rotate to stir the liquid material in the reactor body 1.

[0028] like Figure 1 and Figure 4 As shown, a first corrosion-resistant layer 13 is provided on the inner wall of the kettle body 1, and the first corrosion-resistant layer 13 covers the inner wall of the kettle body 1. A steel mesh 131 is provided in the first corrosion-resistant layer 13, and the steel mesh 131 is connected to the kettle body 1. The first corrosion-resistant layer 13 is made of polytetrafluoroethylene (polypropylene or polyethylene can also be used), which is acid-resistant, alkali-resistant, and resistant to various organic solvents. The long-term working temperature span can reach -180 to 260°C. The steel mesh 131 is welded to the inner wall of the kettle body 1, and then the polytetrafluoroethylene raw material is used to form a rotational molding method. The first corrosion-resistant layer 13 is formed, and the wire mesh 131 can increase the structural strength of the first corrosion-resistant layer 13 and improve the service life of the reactor. The outer walls of the connecting shaft 22 and the stirring paddle 23 are provided with a second corrosion-resistant layer 24. The second corrosion-resistant layer 24 is made of polytetrafluoroethylene (polypropylene or polyethylene can also be used). The second corrosion-resistant layer 24 wraps the connecting shaft 22 and the stirring paddle 23, thereby achieving a good anti-corrosion effect. The parts of the reactor that are in contact with the solution are all made of polytetrafluoroethylene, and the overall anti-corrosion effect is good.

[0029] like Figure 1 As shown, a jacket 5 is provided on the outer wall of the kettle body 1. The jacket 5 is arranged on the outer wall of the kettle body 1 to wrap the side and bottom of the kettle body 1. An inlet pipe 51 is provided on the side of the jacket 5 near the top position. The inlet pipe 51 is connected to the second fluid conveyor 53. An outlet pipe 52 is provided at the bottom of the jacket 4 near the first discharge pipe 12. The inlet pipe 51 and the outlet pipe 52 are used for entering and discharging the medium, so as to facilitate the use of the jacket 5 to keep the kettle body 1 warm.

[0030] like Figure 1 , Figure 2 and Figure 3As shown, a lower through pipe 14 and an upper through pipe 15 are provided on the side wall of the kettle body 1, and the lower through pipe 14 and the upper through pipe 15 are connected to the internal space of the kettle body 1, and the first circulation pump 3 is connected to the lower through pipe 14. The first circulation pump 3 adopts a magnetic pump with good anti-corrosion effect, and the heater 4 is connected to the first circulation pump 3. The heater 4 includes a shell 41, a working tube 42, an insulation layer 43, an electromagnetic induction coil 44, a tube sheet 45 and a head 46. The heater 4 is arranged vertically. The shell 41 is generally cylindrical. The upper and lower ends of the shell 41 are respectively connected to the tube sheets 45. There are multiple working tubes 42. The multiple working tubes 42 are arranged in the kettle body 1 and connected between the two tube sheets 45. The two tube sheets 45 are respectively connected to the head 46. The head 46 is provided with a first connecting port pipe 461 connected to the working tube 42. The first connecting port pipe 461 on the lower end head 46 is connected to the first circulation pump 3, so that the first circulation pump 3 can transport the liquid material in the kettle body 1 to the working tube 42 through the first connecting port pipe 461 at the lower end. The first connecting port pipe 461 on the upper end head 46 is connected to the upper side through pipe 15 through the second connecting pipe, so that the liquid material after passing through the working tube 42 returns to the kettle body 1 through the upper side through pipe 15. The heat insulation layer 43 is arranged outside the shell 41. The heat insulation layer 43 adopts existing heat insulation materials, such as nano heat insulation paint, and is applied to the outer wall of the shell 41 by spraying or scraping. The electromagnetic induction coil 44 is wound outside the heat insulation layer 43. The electromagnetic induction coil 44 is connected to an external controller. The external controller adopts the controller of the JS1000 series 20KW electromagnetic heater produced by Jiangxin Electromagnetic, with a voltage of 380V, a maximum power of 20KW, and a power regulation of 20%-100% stepless regulation. When working, the electromagnetic induction coil 44 generates an alternating electromagnetic field, and the shell 41 and the working tube 42 Stainless steel material is used, and the shell 41 and the working tube 42 generate heat, for example, the heating temperature is 120°C. The working tube 42 can heat the liquid material flowing through. Under the action of the first circulation pump 3, the liquid material in the kettle body 1 enters the working tube 42 of the heater 4 from the lower side pipe 14, and returns to the kettle body 1 from the upper side pipe 15 after heating, completing the circulation heating. During the circulation, the stirring device 2 does not need to work to effectively heat the liquid material in the kettle body 1, and the circulation heating speed is fast. Even when the stirring device 2 is working, the liquid material flowing in the kettle body 1 will not impact the heater 4.

[0031] like Figure 1 , Figure 2 and Figure 3As shown, a housing chamber 401 is provided in the shell 41, and a second medium inlet pipe 411 and a second medium outlet pipe 412 are provided on the side wall of the shell 41. The second medium inlet pipe 411 and the second medium outlet pipe 412 are connected with the housing chamber 401. When the electromagnetic induction coil 44 is working, the shell 41 generates heat to heat the medium in the housing chamber 401. The medium entering through the second medium inlet pipe 411 is discharged from the medium outlet pipe 412 after being heated. The second medium outlet pipe 412 is connected with the inlet pipe 51 through the second fluid conveyor 53. The medium discharged from the housing chamber 401 enters the jacket 5, and the medium can keep the kettle body 1 warm.

[0032] like Figure 1 and Figure 2 As shown, the first connecting port pipe 461 on the upper end cover 46 is connected to the second connecting pipe, and the second connecting pipe is provided with a second discharge pipe 413, and the second discharge pipe 413 is provided with a second discharge valve. The liquid material heated by the working pipe 42 can be directly discharged through the second discharge pipe 413, which is convenient for use when a small amount of liquid material needs to be heated and discharged, and there is no need to heat the liquid material in the entire kettle body 1, which saves energy and reduces consumption. The first connecting port pipe 461 is provided with a first temperature sensor 61, the second medium outlet pipe 412 is provided with a second temperature sensor 62, and the kettle body 1 is also provided with a third temperature sensor (the third temperature sensor adopts the existing insertion type and is inserted from the top of the kettle body 1, which is not shown in the figure). The first temperature sensor 61, the second temperature sensor 62 and the third temperature sensor are connected to the external controller of the electromagnetic induction coil 44 and send temperature signals. The external controller controls the operation of the electromagnetic induction coil 44 according to the temperature signal.

[0033] The heater 4 includes a first heating mode and a second heating mode;

[0034] In the first heating mode, the outlet pipe 52 is connected to the second medium inlet pipe 411, the second medium is stored in the jacket 5 and the accommodating chamber 401, and the second medium is heat-conducting oil. When the second fluid conveyor 53 is working, the second medium circulates between the jacket 5 and the accommodating chamber 401, and the electromagnetic induction coil 44 is working. The working tube 42 heats the liquid material in the working tube 42 and the second medium in the accommodating chamber 401, and the liquid material in the kettle body 1 is circulated and heated to increase the temperature, and the second medium in the jacket 5 is circulated and heated to keep the kettle body 1 warm.

[0035] In the second heating mode, the second medium inlet pipe 411 is connected to the external heating medium, and the external heating medium exchanges heat with the liquid material in the working tube 42 to heat the liquid material in the working tube 42. The external heating medium is steam, water, thermal oil or flue gas. At this time, the electromagnetic induction coil 44 does not work, and the heater 4 acts as a heat exchanger to heat the liquid material in the working tube 42 using the heat of the external heating medium, thereby circulating and heating the liquid material in the kettle body 1. After the external heating medium exchanges heat in the heater 4, it enters the jacket 5 through the second fluid conveyor 53 to keep the kettle body 1 warm. When the external heating medium is steam, water or thermal oil, the second fluid conveyor 53 uses a pump, and when the external heating medium is flue gas, the second fluid conveyor 53 uses a fan. These external heating media can be introduced in places with high-temperature steam, high-temperature water, high-temperature thermal oil or high-temperature flue gas to recover heat.

[0036] The number of heaters 4 can be multiple as required, and the multiple heaters 4 are arranged in parallel, so as to heat the incoming liquid material at the same time, and the heated liquid material returns to the kettle body 1.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A corrosion-resistant reactor that is convenient for cyclic heating, characterized in that: The invention comprises a kettle body (1), a stirring device (2) arranged on the kettle body (1), a first circulation pump (3) connected to the kettle body (1), and a heater (4) connected to the first circulation pump (3); the heater (4) comprises a shell (41), a working pipe (42) arranged in the shell (41), a heat insulation layer (43) arranged outside the shell (41), and an electromagnetic induction coil (44) wound outside the heat insulation layer (43); one end of the working pipe (42) is connected to the first circulation pump (3), and the other end is connected to the kettle body (1); when the electromagnetic induction coil (44) is in operation, it heats the liquid in the working pipe (42) through the working pipe (42).

2. The corrosion-resistant reactor for cyclic heating according to claim 1, characterized in that: The shell (41) is connected to tube sheets (45) at both ends, the working tube (42) is connected between the two tube sheets (45), the tube sheet (45) is connected to a head (46), the head (46) is provided with a first communication port pipe (461) connected to the working tube (42), the shell (41) is provided with a containing cavity (401), and the shell (41) is provided with a second medium inlet pipe (411) and a second medium outlet pipe (412) connected to the containing cavity (401).

3. The corrosion-resistant reactor for cyclic heating according to claim 2, characterized in that: A jacket (5) is provided on the outer wall of the kettle body (1), and an inlet pipe (51) and an outlet pipe (52) are provided on the jacket (5), and the inlet pipe (51) is connected to the second medium outlet pipe (412) through a second circulation pump (53).

4. The corrosion-resistant reactor for cyclic heating according to claim 2, characterized in that: The first communication port pipe (461) is provided with a first temperature sensor (61), and the second medium outlet pipe (412) is provided with a second temperature sensor (62).

5. The corrosion-resistant reactor for cyclic heating according to claim 1, characterized in that: The kettle body (1) is provided with a first feed pipe (11) and a first discharge pipe (12), and the kettle body (1) is also provided with a third temperature sensor.

6. The corrosion-resistant reactor for cyclic heating according to claim 1, characterized in that: The stirring device (2) comprises a stirring motor (21) arranged on the top of the kettle body (1), a connecting shaft (22) connected to the stirring motor (21), and a stirring paddle (23) arranged on the connecting shaft (22).

7. The corrosion-resistant reactor for cyclic heating according to claim 1, characterized in that: The inner wall of the kettle body (1) is provided with a first corrosion-resistant layer (13), and the outer walls of the connecting shaft (22) and the stirring paddle (23) are both provided with a second corrosion-resistant layer (24).

8. The corrosion-resistant reactor for cyclic heating according to claim 1, characterized in that: The number of the working tubes (42) is more than one.

9. The corrosion-resistant reactor for cyclic heating according to claim 2, characterized in that: The first connecting port pipe (461) is connected to the kettle body (1) via a second connecting pipe, and the second connecting pipe is provided with a second discharge pipe (413).

10. The corrosion-resistant reactor for cyclic heating according to claim 3, characterized in that: The heater (4) comprises a first heating mode and a second heating mode; In the first heating mode, the outlet pipe (52) is connected to the second medium inlet pipe (411), the second medium circulates between the jacket (5) and the containing chamber (401), the electromagnetic induction coil (44) works, and the working pipe (42) heats the liquid in the working pipe (42) and the second medium in the containing chamber (401); In the second heating mode, the second medium inlet pipe (411) is connected to an external heating medium, and the external heating medium exchanges heat with the liquid in the working tube (42) to heat the liquid in the working tube (42). The external heating medium is steam, water, heat transfer oil or flue gas.

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