CN216687494U

CN216687494U - Liquid methanol collecting system

Info

Publication number: CN216687494U
Application number: CN202123405419.XU
Authority: CN
Inventors: 陈佰文
Original assignee: Maoming Huayue Huayuan Gas Co ltd
Current assignee: Maoming Huayue Huayuan Gas Co ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-06-07
Anticipated expiration: 2031-12-30

Abstract

The present invention relates to a methanol collection system, and more particularly, to a liquid methanol collection system comprising: the system comprises a carbon dioxide compressor, a separation device, a methanol collection device and a cold box; the separation device is connected with the carbon dioxide compressor; the methanol collecting device is connected with the separating device, the methanol collecting device is connected with a second pipeline, the second pipeline is connected with a condensation and emptying pipeline, and a torch system for burning methanol gas is arranged on the condensation and emptying pipeline; the condensation emptying pipeline is arranged in the cold box and is connected with a third pipeline; the third pipeline is connected with the first pipeline through a secondary return pipeline. The utility model effectively solves the problem that the carbon dioxide feed gas contains a large amount of saturated methanol gas, realizes the liquefaction, collection and storage of the saturated methanol gas in the carbon dioxide feed gas, and ensures the safe production of the device and the safety of operators.

Description

Liquid methanol collecting system

Technical Field

The present invention relates to methanol collection systems, and more particularly, to a liquid methanol collection system.

Background

In a coal hydrogen production system, a coal hydrogen production device is frequently operated in a heavy load and overload state, so that abnormal working conditions of the whole system are brought, and carbon dioxide feed gas carries about 2% of saturated methanol gas. The carbon dioxide-methanol mixed gas is compressed and condensed by a carbon dioxide compressor, and then more liquid methanol is separated out from a condensation discharge valve, and the methanol has toxicity, has the greatest influence on the nervous system and the blood system of a human body, and can generate toxic reaction when being taken in through the alimentary canal, the respiratory tract or the skin, thereby damaging the respiratory tract mucosa and the vision of the human body.

Therefore, in order to avoid safety and environmental protection accidents caused by the discharge of a large amount of liquid methanol on the site of hydrogen production from coal, the liquid methanol must be collected in a targeted manner, so that the problem that the carbon dioxide feed gas contains a large amount of saturated methanol gas is solved, and the safety of personnel and the safety production of devices are ensured.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, an object of the present invention is to provide a liquid methanol collection system, which effectively solves the problem that the carbon dioxide feed gas contains a large amount of saturated methanol gas, realizes liquefaction, collection and storage of the saturated methanol gas in the carbon dioxide feed gas, and ensures safe production of the apparatus and safety of operators.

The above technical object of the present invention is achieved by the following technical solution, a liquid methanol collecting system, comprising:

the separation device is connected with a carbon dioxide compressor;

the methanol collecting device is connected with the separating device through a first pipeline, the methanol collecting device is connected with a second pipeline, the other end, far away from the methanol collecting device, of the second pipeline is connected with a condensation emptying pipeline, and a torch system used for burning methanol gas is arranged on the condensation emptying pipeline;

the condensation emptying pipeline is arranged in the cold box and is connected with a third pipeline; the third pipeline is connected with a secondary return pipeline, and the outlet of the secondary return pipeline is connected with the first pipeline.

In one embodiment, the second pipeline is provided with a U-shaped water sealing section for water sealing.

In one embodiment, a shower guide pipe is arranged at the lowest position of the U-shaped water sealing section of the second pipeline, and a shower guide valve is arranged on the shower guide pipe.

In one embodiment, a flame arrestor is disposed on the second pipeline.

In one embodiment, a water seal water inlet pipe is further arranged on the second pipeline.

In one embodiment, the outlet of the third pipeline is also connected with a carbon dioxide emptying pipeline.

In one embodiment, a secondary recooler is further disposed on the third pipeline.

In one embodiment, the separation device, the methanol collection device, the cold box, the first pipeline, the second pipeline and the third pipeline are also connected with a grounding electrostatic device.

The utility model has the advantages that:

(1) according to the utility model, the carbon dioxide-methanol mixed gas is subjected to three-stage compression by the carbon dioxide compressor, then enters the separation device for gas-liquid separation, then the separated liquid methanol enters the methanol collection device for collection and storage, the methanol gas which is not liquefied enters the second pipeline along with the carbon dioxide gas and is combusted by the torch system, and part of the methanol liquid which is not combusted is condensed by the cold box and then returns to the methanol collection device again, so that the liquefaction, separation, collection and storage of the methanol gas in the carbon dioxide feed gas are realized, and the safety production of the device and the safety of operators are ensured.

(2) The flame arrester is arranged on the second pipeline, when the torch system burns methanol gas, the flame arrester can prevent external flame from channeling into a methanol collecting device containing flammable and explosive methanol liquid, and therefore the safety of the device in operation is guaranteed.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

In the figure, 1, a separation device; 2. a methanol collection device; 3. a cold box; 4. a flare system; 5. a first pipeline; 6.

a second pipeline; 7. a condensing and venting line; 8. a third pipeline; 9. a secondary recooling device; 10. a carbon dioxide vent line; 11. a secondary return line; 12. a flame arrestor; 13. a lead shower pipe; 14. a pilot shower valve; 15. water seal water inlet pipe; 16. a manual control valve; 17. a carbon dioxide compressor.

Detailed Description

As shown in fig. 1, a liquid methanol collection system includes a separation device 1, a methanol collection device 2, a cold box 3, a flare system 4, and a carbon dioxide compressor 17.

The separation device 1 comprises an inlet and an outlet, the inlet of the separation device 1 being connected to the three-stage compression outlet of the carbon dioxide compressor 17 and the outlet of the separation device 1 being connected to the first line 5.

The methanol collecting device 2 comprises an inlet and an outlet, the inlet of the methanol collecting device 2 is connected with one end of the first pipeline 5 far away from the outlet of the separating device 1, and the outlet of the methanol collecting device 2 is connected with the second pipeline 6. The one end that methyl alcohol collection device 2 exported was kept away from to second pipeline 6 is connected with condensation unloading pipeline 7, and condensation unloading pipeline 7 sets up in cold box 3, and condensation unloading pipeline 7 is connected with third pipeline 8, is provided with the torch system 4 that is used for burning the gaseous methyl alcohol on condensation unloading pipeline 7's the end, and torch system 4 is used for burning the gaseous methyl alcohol, guarantees that discharge gas accords with the environmental protection standard, guarantees the safety in production of mill, reduces environmental pollution.

A secondary recooler 9 is arranged on the third pipeline 8, the outlet of the third pipeline 8 is respectively connected with a carbon dioxide emptying pipeline 10 and a secondary return pipeline 11, and one end of the secondary return pipeline 11 far away from the third pipeline 8 is connected with the first pipeline 5.

Further, a flame arrester 12 is arranged on the second pipeline 6, specifically, the flame arrester 12 is a flange type connecting flame arrester, and the specification of the flame arrester is PN1.6, DN 100. Flame arrestor 12 prevents external flames from escaping into methanol collection device 2 where flammable and explosive liquid methanol is present when flare system 4 is burning methanol gas.

Further, a U-shaped water seal section for water seal is arranged on the second pipeline 6.

Furthermore, the lowest part of the U-shaped water sealing section of the second pipeline 6 is provided with a shower guiding pipe 13, the shower guiding pipe 13 is provided with a shower guiding valve 14, and the specification of the shower guiding valve 14 is PN1.6, DN 25. The lowest part of the U-shaped water seal section is provided with a pilot shower valve 14, and when shutdown maintenance or reexamination is needed, residual liquid in the second pipeline 6 can be discharged through the pilot shower pipe 13.

Further, liquid methyl alcohol collecting system still including the toxic gas on-line monitoring appearance of monitoring methyl alcohol gas content, but the staff real-time supervision methyl alcohol gas's content, when indoor methyl alcohol gas content exceeds standard, but the staff very first time discovery and take and prepare urgent scheme.

Further, the liquid methanol collection safety system also comprises a fire-fighting spray device which is arranged above the torch system 4.

Further, still be provided with water seal inlet tube 15 on the second pipeline 6, water seal inlet tube 15 includes last water seal inlet tube and lower water seal inlet tube.

Furthermore, ball valves are arranged on the upper water seal water inlet pipe 171, the lower water seal water inlet pipe 172 and the shower guide pipe 13; the first pipeline 5, the second pipeline 6, the third pipeline 8, the carbon dioxide emptying pipeline 10 and the secondary return pipeline 11 are provided with stop valves, and the third pipeline 8 is also provided with a manual control valve 16.

Furthermore, the separation device 1, the methanol collection device 2, the cold box 3, the first pipeline 5, the second pipeline 6 and the third pipeline 8 are also connected with a grounding electrostatic device. Static electricity can be prevented from being generated in the device or the pipeline.

Further, the methanol collecting device 2 is a pressure container, and the volume of the methanol collecting device 2 is 5-10 m³The material is Q345 carbon steel; the separation device 1 is a three-stage separator of a carbon dioxide compressor.

Further, the specification of the first pipeline 5 and the third pipeline 8 is DN25, the specification of the second pipeline 6 and the condensation blow-down pipeline 7 is DN100, and the absolute height of the condensation blow-down pipeline 7 is 30-35 m.

The working principle of the utility model is as follows: the carbon dioxide raw material gas carrying the saturated methanol gas is firstly compressed in three stages by a carbon dioxide compressor 17, so that the saturated methanol gas in the carbon dioxide raw material gas is compressed into liquid, and on one hand, the isothermal compression can be approached by adopting a multi-stage compression mode, so that the temperature rise in the gas compression process is avoided, and the liquefied methanol is gasified again; on the other hand, the volume utilization rate of the container can be improved. The gas-liquid mixture after three-stage compression by the carbon dioxide compressor 17 enters the separation device 1 for gas-liquid separation, liquid methanol flows into the methanol collection device 2 through the first pipeline 5 and is collected and stored in the methanol collection device 2, part of the carbon dioxide-methanol gas mixture also flows into the methanol collection device 2 through the first pipeline 5 and enters the second pipeline 6 and the condensation and emptying pipeline 7 through the top outlet of the methanol collection device 2, part of the methanol gas is combusted through the torch system 4 at the tail end of the condensation and emptying pipeline to generate carbon dioxide and water, and the rest of the methanol gas is condensed into liquid through the cold box 3, and then the methanol gas is returned to the methanol collection device 2 through the third pipeline 8 and the secondary return pipeline 11 for collection and storage through controlling the opening and closing of the stop valve or the manual control valve 18. And the carbon dioxide flows into the next process through the carbon dioxide blow line 10.

It will be apparent to those skilled in the art that various other changes and modifications may be made in the above-described embodiments and concepts and all such changes and modifications are intended to be within the scope of the appended claims.

Claims

1. A liquid methanol collection system, comprising:

a separation device (1), wherein the separation device (1) is connected with a carbon dioxide compressor (17);

the device comprises a methanol collecting device (2), wherein the methanol collecting device (2) is connected with a separating device (1) through a first pipeline (5), the methanol collecting device (2) is connected with a second pipeline (6), the other end, away from the methanol collecting device (2), of the second pipeline (6) is connected with a condensation emptying pipeline (7), and a torch system (4) for burning methanol gas is arranged on the condensation emptying pipeline (7);

the cooling box (3), the condensation emptying pipeline (7) is arranged in the cooling box (3), and the condensation emptying pipeline (7) is connected with a third pipeline (8); the third pipeline (8) is connected with a secondary return pipeline (11), and the outlet of the secondary return pipeline (11) is connected with the first pipeline (5).

2. Liquid methanol collection system according to claim 1, wherein the second line (6) is provided with a U-shaped water seal section for water sealing.

3. The liquid methanol collection system according to claim 2, wherein the lowest part of the U-shaped water sealing section of the second pipeline (6) is provided with a shower guide pipe (13), and the shower guide pipe (13) is provided with a shower guide valve (14).

4. A liquid methanol collection system according to claim 1, wherein a flame arrester (12) is provided on the second line (6).

5. Liquid methanol collection system according to claim 1, wherein the second line (6) is provided with a water seal inlet pipe (15).

6. A liquid methanol collection system according to claim 1, wherein the outlet of the third line (8) is further connected to a carbon dioxide vent line (10).

7. A liquid methanol collection system according to claim 1, characterized in that a secondary recooler (9) is also provided on the third line (8).

8. A liquid methanol collection system according to claim 1, wherein the separator (1), the methanol collection device (2), the cold box (3), the first pipeline (5), the second pipeline (6) and the third pipeline (8) are further connected with a grounded electrostatic device.