Reaction kettle

Abstract

The utility model relates to a reaction kettle. The reaction kettle comprises a kettle body and a stirring device arranged in the kettle body, a heating / cooling device I is mounted in the kettle body; the heating / cooling device is formed by spirally winding a plurality of coil pipes, the upper ends of the plurality of coil pipes are connected with a steam / cooling water outlet arranged on the kettle body, and the lower ends of the plurality of coil pipes are connected with a steam / cooling water inlet arranged on the kettle body; when the multiple strands of coil pipes are spirally wound together, the multiple strands of coil pipes are dense to form a flow guide screen, and the flow guide screen is cylindrical; when the reaction kettle is used, materials in the kettle body are pushed by the stirring device to circularly flow inside and outside the flow guide screen. The reaction kettle is simple in structure and efficient in heat exchange, effectively reduces the temperature gradient of materials in the kettle body, and can quickly displace heat when a polymerization reaction is carried out.

Description

Technical Field

[0001] The utility model relates to a reaction kettle, in particular to a reaction kettle with high heat exchange efficiency. Background Art

[0002] The reactor is the core equipment of the polyether polyol unit. It uses polyether and glycerol as initiators (containing active hydrogen groups) and polymerizes with ethylene oxide (EO), propylene oxide (PO), etc. under the action of catalysts. The raw materials in the reactor are strongly and evenly mixed under heating / cooling and mechanical stirring, and chemical reactions occur at the set temperature to generate the desired products.

[0003] Existing reactors are limited by the fact that the material of the reactor body cannot take into account both corrosion resistance and strength. In addition, the heat exchange between the designed heating / cooling device and the materials in the reactor body is uneven and inefficient, and there is a temperature gradient in the materials in the reactor body. Especially during the polymerization reaction, the material will release a large amount of heat, the viscosity of the material will also increase, and the fluidity will become worse and worse. If the heat cannot be quickly replaced, the product produced will have more impurities and the polymerization reaction cycle will be prolonged. Utility Model Content

[0004] In order to solve the above problems, the utility model proposes a reaction kettle with high heat exchange efficiency, which effectively reduces the temperature gradient of the material in the kettle body and can quickly replace the heat when the polymerization reaction is carried out.

[0005] The technical solution of this utility model:

[0006] A reaction kettle, comprising a kettle body and a stirring device installed in the kettle body; a heating / cooling device I is installed in the kettle body; the heating / cooling device is composed of a plurality of coils spirally wound together, the upper ends of the plurality of coils are connected to a steam / cooling water outlet arranged on the kettle body, and the lower ends are connected to a steam / cooling water inlet arranged on the kettle body;

[0007] The materials (polyether, glycerol as initiator (containing active hydrogen groups), ethylene oxide (EO), propylene oxide (PO), etc., and catalyst) are fed from the bottom of the reactor (considering that the materials are relatively light); initially, the medium circulating in the multi-strand coil is steam, which heats the materials in the reactor. When the materials reach the reaction temperature, a large amount of heat will be generated after the reaction begins. At this time, the medium circulating in the multi-strand coil is changed to cooling water to displace the heat generated by the reaction. After the reaction is completed, the materials are discharged from the bottom of the reactor. During the whole process, the materials are stirred by an agitator to mix them evenly. The design uses multi-strand coils, which have shorter threads than traditional single-strand coils, significantly reduce resistance and pressure drop, and have higher heat exchange efficiency.

[0008] When multiple coils are spirally wound together, the multiple coils are densely packed to form a guide screen, and the guide screen is cylindrical;

[0009] When the reactor is in use, the materials in the reactor body circulate inside and outside the guide screen under the impetus of the stirring device, so that the materials in the reactor body are mixed more evenly and the temperature gradient of the materials in the reactor body is reduced.

[0010] A heating / cooling device II is installed outside the kettle body, and the heating / cooling device is composed of multiple half-tubes spirally wound around the middle and upper part of the outer wall of the kettle body, and the upper end of each half-tube is connected to the steam / cooling water outlet arranged on the kettle body, and the lower end is connected to the steam / cooling water inlet arranged on the kettle body;

[0011] When the medium circulating in the multi-strand coil is steam, the medium circulating in the multi-section half-tube is also steam; when the medium circulating in the multi-strand coil is cooling water, the medium circulating in the multi-section half-tube is also cooling water; the heating / cooling effect on the material in the kettle is improved.

[0012] A heating / cooling device III is installed outside the kettle body. The heating / cooling device III is composed of a jacket installed on the lower part of the outer wall of the kettle body. A steam / cooling water outlet is arranged on the upper part of the jacket, and a steam / cooling water inlet is arranged on the lower part.

[0013] When the medium circulating in the multi-strand coil is steam, the medium circulating in the jacket is also steam; when the medium circulating in the multi-strand coil is cooling water, the medium circulating in the jacket is also cooling water; the heating / cooling effect on the material in the kettle is improved.

[0014] A spiral guide plate is installed in the jacket to allow the medium to circulate in the jacket to avoid dead corners.

[0015] The stirring device is a double-screw stirrer. The stirring paddle of the double-screw stirrer is located in the guide screen and is centered. The double-screw stirrer can generate axial thrust, effectively promoting the circulation of materials in the kettle inside and outside the guide screen.

[0016] The kettle body is made of explosive composite steel plates, the inner metal layer of which is corrosion-resistant metal and the outer metal layer is low-alloy steel; the kettle body is light, high in strength and corrosion-resistant.

[0017] The reactor also includes a skirt-type ear seat, which is sleeved on the middle of the reactor body and fixedly connected to the reactor body; it can support the weight of the reactor and materials, as well as transient impact loads during start-up and shutdown, and has the characteristics of large bearing capacity and low local stress at the connection with the reactor body.

[0018] The inner wall of the kettle is fixedly connected with a plurality of baffles, each of which supports and fixes a plurality of coils; the inner space of the kettle is fully utilized, and the baffles can effectively improve the stirring effect.

[0019] A feed distributor is installed in the kettle body, and the feed distributor is located inside and at the bottom of the kettle body. It is connected to a feed port arranged on the top of the kettle body through a feed pipe, and the feed pipe is in contact with the inner wall of the guide screen. When feeding, the material passing through the feed pipe is preheated so that it can be heated to the reaction temperature more quickly after being distributed in the kettle body.

[0020] The feed distributor is a ring tube structure, and a plurality of distribution holes are evenly distributed at the bottom thereof, so that the material distribution is uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the reactor structure.

[0022] In the figure, a kettle body 1, a stirring device 2, a multi-strand coil 3, a half pipe 4, a jacket 5, a spiral guide plate 6, a skirt ear seat 7, a baffle 8, a feed distributor 9, a feed pipe 10, a feed port 11, a circulating material port 12, and a discharge port 13 are arranged at the bottom. DETAILED DESCRIPTION

[0023] As shown in the figure, a reactor comprises a reactor body 1 and a stirring device 2 installed in the reactor body 1; a heating / cooling device I is installed in the reactor body 1; the heating / cooling device is composed of a plurality of coils 3 spirally wound together, the upper end of the plurality of coils 3 is connected to the steam / cooling water outlet arranged on the reactor body 1, and the lower end is connected to the steam / cooling water inlet arranged on the reactor body 1;

[0024] When multiple coils 3 are spirally wound together, the multiple coils 3 are densely packed to form a guide screen, and the guide screen is cylindrical;

[0025] When the reactor is in use, the material in the reactor body 1 circulates inside and outside the guide screen under the impetus of the stirring device 2;

[0026] A heating / cooling device II is installed outside the kettle body 1, and the heating / cooling device is composed of three half-pipes 4 spirally wound around the middle and upper part of the outer wall of the kettle body 1, and the upper end of each half-pipe 4 is connected to the steam / cooling water outlet arranged on the kettle body 1, and the lower end is connected to the steam / cooling water inlet arranged on the kettle body 1;

[0027] A heating / cooling device III is installed outside the kettle body 1, and the heating / cooling device III is composed of a jacket 5 installed on the lower part of the outer wall of the kettle body 1, and the jacket 5 is provided with a steam / cooling water outlet at the upper part and a steam / cooling water inlet at the lower part;

[0028] A spiral guide plate 6 is installed in the jacket 5;

[0029] The stirring device 2 is a double-screw stirrer, and the stirring paddle of the double-screw stirrer is located in the guide screen and centered;

[0030] The kettle body 1 is made of explosive composite steel plate, the inner metal layer is corrosion-resistant metal, and the outer metal layer is low alloy steel;

[0031] The reactor further comprises a skirt-type ear seat 7, which is sleeved on the middle part of the reactor body 1 and fixedly connected to the reactor body 1;

[0032] The inner wall of the kettle body 1 is fixedly connected to a plurality of baffles 8, each baffle 8 supports and fixes the multiple coils 3;

[0033] A feed distributor 9 is installed in the kettle body 1. The feed distributor 9 is located at the bottom of the kettle body 1 and is connected to a feed port 11 arranged at the top of the kettle body 1 through a feed pipe 10. The feed pipe 10 is in contact with the inner wall of the guide screen.

[0034] The feed distributor 10 is a ring tube structure, and a plurality of distribution holes are evenly distributed at the bottom thereof;

[0035] (A circulating material port 12 is provided at the top of the kettle body 1, and a discharge port 13 is provided at the bottom).

[0036] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. A reaction kettle, comprising a kettle body and a stirring device installed in the kettle body; a heating / cooling device I is installed in the kettle body; characterized in that: The heating / cooling device is composed of a plurality of coils spirally wound together, the upper ends of the plurality of coils are connected to the steam / cooling water outlet arranged on the kettle body, and the lower ends are connected to the steam / cooling water inlet arranged on the kettle body; When multiple coils are spirally wound together, the multiple coils are densely packed to form a guide screen, and the guide screen is cylindrical; When the reactor is in use, the materials in the reactor body circulate inside and outside the guide screen under the impetus of the stirring device.

2. A reaction kettle according to claim 1, characterized in that: A heating / cooling device II is installed outside the kettle body. The heating / cooling device is composed of multiple half-tubes spirally wound around the middle and upper part of the outer wall of the kettle body. The upper end of each half-tube is connected to the steam / cooling water outlet arranged on the kettle body, and the lower end is connected to the steam / cooling water inlet arranged on the kettle body.

3. A reaction kettle according to claim 1, characterized in that: A heating / cooling device III is installed outside the kettle body. The heating / cooling device III is composed of a jacket installed on the lower part of the outer wall of the kettle body. A steam / cooling water outlet is arranged on the upper part of the jacket, and a steam / cooling water inlet is arranged on the lower part.

4. A reaction kettle according to claim 3, characterized in that: A spiral guide plate is installed in the jacket.

5. A reaction kettle according to claim 1, characterized in that: The stirring device is a double-screw stirrer, and the stirring paddle of the double-screw stirrer is located in the guide screen and centered.

6. A reaction kettle according to claim 1, characterized in that: The kettle body is made of explosive composite steel plates, the inner metal layer of which is corrosion-resistant metal and the outer metal layer is low-alloy steel.

7. A reaction kettle according to claim 1, characterized in that: The reactor further comprises a skirt-type ear seat, which is sleeved on the middle part of the reactor body and fixedly connected to the reactor body.

8. A reaction kettle according to claim 1, characterized in that: A plurality of baffles are fixedly connected to the inner wall of the kettle, and each baffle supports and fixes a plurality of coils.

9. A reaction kettle according to claim 1, characterized in that A feed distributor is installed in the kettle body. The feed distributor is located inside and at the bottom of the kettle body. It is connected to a feed port arranged at the top of the kettle body through a feed pipe. The feed pipe is in contact with the inner wall of the guide screen.

10. A reaction kettle according to claim 9, characterized in that: The feed distributor is a ring tube structure, and a plurality of distribution holes are evenly distributed at the bottom thereof.

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