Device for preventing liquid caustic soda from flowing backwards

Abstract

The utility model relates to the technical field of chemical engineering devices, in particular to a device for preventing liquid alkali from flowing backwards, which is arranged between a factory air main pipeline and a catalyst alkali liquor pipeline and comprises a buffer tank, the first pipeline is arranged between the main pipeline and the buffer tank, a first valve is arranged at the end close to the buffer tank, the second pipeline is arranged between the buffer tank and the catalyst alkali liquor pipeline, a third valve is arranged at the position close to the buffer tank, and a first one-way valve is arranged at the end close to the catalyst alkali liquor pipeline. The device has the advantages that liquid caustic soda which flows back due to failure of the first one-way valve is prevented from entering a factory air pipeline to cause influence and damage, and the purpose of protecting a factory air system is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a device for preventing liquid alkali from flowing back. Background Art

[0002] In the product refining unit of the refinery, for the regeneration of alkali liquid, there is sodium mercaptide in the alkali liquid, and non-purified wind (air) needs to be introduced into the alkali liquid to reduce it to sodium hydroxide. The non-purified air in the factory air pipeline flows into the liquid alkali pipeline through the pipeline, but due to the medium characteristics of the liquid alkali and other factors, the factory air check valve will fail. During the liquid alkali regeneration operation, the factory air check valve fails, causing the liquid alkali to flow back into the factory air pipeline, affecting and damaging the factory air system. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a device for preventing liquid alkali from flowing back, which is arranged between the factory air main pipeline and the catalyst alkali liquid pipeline, and comprises:

[0004] Buffer tank;

[0005] The first pipeline is arranged between the main pipeline and the buffer tank, and a first valve is arranged near the end of the buffer tank.

[0006] The second pipeline is arranged between the buffer tank and the catalyst alkali liquid pipeline, a third valve is arranged near the buffer tank, and a first check valve is arranged near the end of the catalyst alkali liquid pipeline;

[0007] Furthermore, it also includes a second one-way valve, which is arranged on the second pipeline and is located between the third valve and the first one-way valve; it also includes a third pipeline, which is arranged between the first pipeline and the second pipeline, and one end of the third pipeline is connected to the pipe section between the second one-way valve and the third valve; the third pipeline is provided with a second valve.

[0008] Furthermore, it also includes a fourth pipeline, which is arranged beside the buffer tank. An on-site liquid level meter is arranged on the fourth pipeline for observing the back alkali liquid level in the buffer tank.

[0009] Furthermore, it also includes a pressure gauge and a safety valve.

[0010] Furthermore, it also includes a heating pipeline, which is arranged on the outer periphery of the buffer tank.

[0011] The advantage of the utility model is that by arranging the device between the factory air main line and the alkali liquid pipeline, a factory air buffer tank is added before the first one-way valve of the factory air pipeline entering the liquid alkali system. Therefore, during the liquid alkali regeneration operation, if the first one-way valve does not work, the liquid alkali that flows back into the buffer tank will not affect or damage the factory air pipeline, thereby achieving the purpose of protecting the factory air system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] In the figure, 1. Factory air main line; 2. Catalyst alkali solution pipeline; 3. Buffer tank; 4. First pipeline; 5. Second pipeline; 6. Heating pipeline; 7. Third valve; 8. First check valve; 9. First valve; 10. Second check valve; 11. Third pipeline; 12. Second valve; 13. Fourth pipeline; 14. Local liquid level meter. DETAILED DESCRIPTION

[0014] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0015] refer to Figure 1 The utility model provides a device for preventing liquid alkali from flowing back, which is arranged between the factory air main pipeline 1 and the catalyst alkali liquid pipeline 2, and includes:

[0016] Buffer tank 3;

[0017] The first pipeline 4, as the inlet pipeline of the factory air, is arranged between the main pipeline 1 and the buffer tank 3, and a first valve 9 is arranged near the end of the buffer tank 3.

[0018] The second pipeline 5, as the outlet pipeline of the factory air, is arranged between the buffer tank 3 and the catalyst alkali solution pipeline 2, a third valve 7 is arranged near the buffer tank 3, and a first check valve 8 is arranged near the end of the catalyst alkali solution pipeline 2;

[0019] In this scheme, during normal use, the non-purified air introduced from the factory air main line 1 enters the buffer tank 3 through the first pipeline 4, then comes out of the buffer tank 3 and enters the catalyst alkali solution pipeline 2 through the second pipeline 5, and then enters the alkali solution air mixer of the next process section.

[0020] As an improvement of the scheme, it also includes a second one-way valve 10, which is arranged on the second pipeline 5 and is located between the third valve 7 and the first one-way valve 8; it also includes a third pipeline 11, which is arranged between the first pipeline 4 and the second pipeline 5, and one end of the third pipeline 11 is connected to the pipe section between the second one-way valve 10 and the third valve 7; the third pipeline 11 is provided with a second valve 12. The first valve 9 and the third valve 7 are arranged on the inlet and outlet pipelines of the buffer tank 3, and the third pipeline 11 is provided with a second valve 12. When the third valve 7 and the first valve 9 are closed during maintenance, and the second valve 12 is opened, the buffer tank can be cut out for maintenance at this time.

[0021] As an improvement of the scheme, it also includes a fourth pipeline 13, which is arranged beside the buffer tank 3. An on-site liquid level meter 14 is arranged on the fourth pipeline 13. The buffer tank 3 is provided with an on-site liquid level meter and a liquid level remote transmission. The liquid level is remotely transmitted to the ethylene main control room. During the alkali solution regeneration operation, the alkali backflow situation can be observed and handled in time.

[0022] As an improvement to the solution, a pressure gauge and a safety valve are also included, which are installed on the top of the buffer tank through pipelines to ensure the safe operation of the storage tank without overpressure.

[0023] As an improvement of the scheme, a heat tracing pipeline 6 is also included, which is arranged on the periphery of the buffer tank. Hot water is used for heat tracing and insulation to ensure that the stored liquid is anti-freezing in winter, and the backflowing liquid alkali is discharged through the buffer tank for centralized treatment.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for preventing liquid alkali from flowing back, arranged between the main air pipeline of a factory and the catalyst alkali pipeline, characterized in that: include, Buffer tank; The first pipeline is arranged between the main pipeline and the buffer tank, and a first valve is arranged near the end of the buffer tank. The second pipeline is arranged between the buffer tank and the catalyst alkali liquid pipeline, a third valve is arranged near the buffer tank, and a first one-way valve is arranged near the end of the catalyst alkali liquid pipeline.

2. A device for preventing liquid alkali from flowing back as claimed in claim 1, characterized in that: It also includes a second one-way valve, which is arranged on the second pipeline and is located between the third valve and the first one-way valve; it also includes a third pipeline, which is arranged between the first pipeline and the second pipeline, and one end of the third pipeline is connected to the pipe section between the second one-way valve and the third valve; the third pipeline is provided with a second valve.

3. The device for preventing liquid alkali from flowing back as claimed in claim 1, characterized in that: It also includes a fourth pipeline, which is arranged beside the buffer tank. An on-site liquid level meter is arranged on the fourth pipeline for observing the back-alkali liquid level in the buffer tank.

4. The device for preventing liquid alkali from flowing back as claimed in claim 1, characterized in that: Also includes pressure gauge and safety valve.

5. The device for preventing liquid alkali from flowing back as claimed in claim 1, characterized in that: It also includes a heating pipeline which is arranged on the outer periphery of the buffer tank.

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