Method for stably conveying dangerous chemicals

Abstract

The invention discloses a method for stably conveying dangerous chemicals, which is characterized in that a buffer is additionally arranged on a dangerous chemical conveying pipeline, the buffer comprises a shell, a gas filling port and a pressure gauge, and an air bag device with pressure is arranged at the upper part in the shell; inert gas is used in the air bag, the outer portion of the air bag makes contact with hazardous chemicals, when the pressure in the hazardous chemical pipeline rises, the air bag shrinks, and after the pressure is reduced, the air bag expands, so that the pressure relief effect on the hazardous chemical pipeline is achieved, meanwhile, the buffering effect on pipeline transportation is achieved, and the water hammer effect of the pipeline is reduced; and the hazardous chemical substance conveying pipeline is protected. The method has the characteristics of convenience in operation, low manufacturing cost, low later maintenance cost, no waste gas, safety, environment friendliness and the like; nitrogen is used as buffer gas, the usage amount is small, the operation cost is low, the using process is relatively safe, and the risk of dangerous chemical leakage is reduced.

Description

Technical Field

[0001] The present invention relates to the field of hazardous chemical transportation, and in particular to a device for mechanical automatic pressure relief when a hazardous chemical transportation pipeline expands upon heat, specifically a method and device for stable transportation of hazardous chemicals. Background Art

[0002] Hazardous chemicals are transported to various production units using pipelines. This is a common process for transporting hazardous chemicals in chemical production. Due to the characteristics of hazardous chemicals, for safety reasons, the front and rear end valves of the conveying pipeline are usually closed after the materials are transported. In summer or when the ambient temperature is high, the materials will gasify and expand in the pipeline, causing the pipeline pressure to increase. Pipeline connections are generally made by welding or flange connections. If there are long-term and drastic changes in pressure inside the pipeline, it will cause greater damage to the flange connections and welds. In addition, when the material in the pipeline flows at high speed, suddenly closing the valve will cause a water hammer effect. The above all have certain safety hazards, so a device needs to be set up to solve the above problems. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems of pressure buildup and water hammer effect in hazardous chemical transportation pipelines, and to reduce long-term safety hazards such as leakage and weld aging caused by pressure buildup or water hammer in pipelines through buffering.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention provides a method for stable transportation of hazardous chemicals, the method comprising:

[0006] By setting buffers on hazardous chemical delivery pipelines, hazardous chemicals can be delivered stably;

[0007] A pressure relief airbag is provided inside the buffer shell, and pressurized inert gas is filled in through the inert gas filling port provided on the top of the shell;

[0008] A pressure display gauge is installed on the pressure relief airbag so that the pressure inside the pressure relief airbag is close to or slightly higher than the pressure of the material in the material conveying pipeline;

[0009] A hazardous chemical buffer space is provided below the pressure relief airbag so that the outer wall of the pressure relief airbag contacts the material in the hazardous chemical buffer space;

[0010] The pressure relief airbag performs the following actions:

[0011] When the material in the material conveying pipeline is not pressurized or is normally pressurized, the pressure relief airbag is always full;

[0012] When the material in the material conveying pipeline is higher than the pressure, the pressure relief airbag contracts, and the hazardous chemicals enter the hazardous chemicals buffer space through the bottom pipe of the buffer, thereby relieving the pressure on the material conveying pipeline.

[0013] The material conveying pipeline is a pipeline formed by connecting the hazardous chemical storage tank to the hazardous chemical conveying pump through a pipe.

[0014] By installing a buffer on the hazardous chemical transportation pipeline, when the valve is suddenly closed during the material transportation process, the water hammer effect of the impact force generated by the inertia of the material in the pipeline is buffered.

[0015] The present invention provides a buffer for stable transportation of hazardous chemicals, comprising:

[0016] case;

[0017] The top of the shell is equipped with an inert gas filling port, an air bag pressure display gauge, and an air bag pressure relief pipeline;

[0018] A pressure relief airbag and a hazardous chemicals buffer space are provided inside the shell; the hazardous chemicals buffer space is provided below the pressure relief airbag, and is filled with hazardous chemicals and is in direct contact with the outside of the pressure relief airbag;

[0019] A root valve of a pressure relief device is provided at the bottom of the shell; a pressure relief air bag is provided above the inside of the shell, and the pressure relief air bag is filled with inert gas and has a certain safety pressure.

[0020] A drainage drain for hazardous chemicals is provided at the bottom of the shell.

[0021] Furthermore, the inert gas filling port is connected to the inert gas pipeline, and the actual pressure of the pressure relief airbag is set according to the material properties.

[0022] Furthermore, a buffer is provided on the pipeline formed by the hazardous chemical storage tank being connected to the hazardous chemical delivery pump through a pipeline, a hazardous chemical storage tank root cut-off valve is provided between the buffer and the hazardous chemical storage tank, and a hazardous chemical delivery pump cut-off valve is provided between the buffer and the hazardous chemical delivery pump.

[0023] Compared with the prior art, the present invention has the following advantages: 1) the present invention has the characteristics of simple structure, convenient operation, low cost, low subsequent maintenance cost, and no waste gas generation; 2) the present invention uses inert gas as a buffer, the usage amount is small, the operating cost is low, and the use process is relatively safe; 3) the present invention uses inert gas as a buffer, and there is no pollution to the environment after the gas is emptied.

[0024] To more clearly illustrate the functional characteristics and structural parameters of the present invention, further description will be given below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 It is a cross-sectional view of the overall structure of the present invention.

[0027] In the figure, the reference numbers are: 1. Inert gas filling inlet; 2. Airbag pressure display gauge; 3. Pressure relief airbag; 4. Hazardous chemical buffer space; 5. Root valve of pressure relief device; 6. Airbag pressure relief pipeline; 7. Hazardous chemical storage tank; 8. Drain guide of pressure relief device; 9. Root shut-off valve of hazardous chemical storage tank; 10. Hazardous chemical delivery pump shut-off valve. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] The present invention provides a method for stable transportation of hazardous chemicals, the method comprising:

[0030] By setting buffers on hazardous chemical delivery pipelines, hazardous chemicals can be delivered stably;

[0031] A pressure relief airbag is provided inside the buffer shell, and pressurized inert gas is filled in through the inert gas filling port provided on the top of the shell;

[0032] A pressure display gauge is installed on the pressure relief airbag so that the pressure inside the pressure relief airbag is close to or slightly higher than the pressure of the material in the material conveying pipeline;

[0033] A hazardous chemical buffer space is provided below the pressure relief airbag so that the outer wall of the pressure relief airbag contacts the material in the hazardous chemical buffer space;

[0034] The pressure relief airbag performs the following actions:

[0035] When the material in the material conveying pipeline is not pressurized or is normally pressurized, the pressure relief airbag is always full;

[0036] When the material in the material conveying pipeline is higher than the pressure, the pressure relief airbag contracts, and the hazardous chemicals enter the hazardous chemicals buffer space through the bottom pipe of the buffer, thereby relieving the pressure on the material conveying pipeline.

[0037] The material conveying pipeline is a pipeline formed by connecting the hazardous chemical storage tank to the hazardous chemical conveying pump through a pipe.

[0038] By installing a buffer on the hazardous chemical transportation pipeline, when the valve is suddenly closed during the material transportation process, the water hammer effect of the impact force generated by the inertia of the material in the pipeline is buffered.

[0039] like Figure 1 As shown, Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0040] The present invention provides a buffer comprising a housing, internally provided with a pressure relief airbag 3 and a hazardous chemical buffer space 4. The pressure relief airbag 3 is a cylindrical structure, 50 cm high and 30 cm in diameter, and is filled with inert gas. The hazardous chemical buffer space 4 is located below the pressure relief airbag 3. When filled with hazardous chemicals, the hazardous chemical buffer space 4 contacts the outer wall of the pressure relief airbag 3. A pressure relief valve 5 is located at the bottom of the housing, through which material enters the hazardous chemical buffer space 4. The top of the housing is provided with an inert gas filling port 1, an overflow port 2 for the airbag pressure display, and a pressure relief drain 8 is located at the bottom of the housing.

[0041] The inert gas filling port 1 is connected to the inert gas pipeline, and the actual pressure of the pressure relief airbag 3 is set according to the material properties. The inert gas pipeline is a pipeline formed by connecting the hazardous chemical storage tank 7 to the hazardous chemical delivery pump through a pipeline.

[0042] Specifically, in the present invention, the volume of the pressure relief airbag 3 when the airbag is inflated and pressurized is 3 / 4 times the volume of the hazardous chemicals buffer space 4.

[0043] Specifically, in the present invention, the inert gas filling port 1 is connected to the inert gas pipeline, and the actual pressure of the pressure relief airbag 3 is set according to the material properties.

[0044] Specifically, in the present invention, a buffer is arranged on the pipeline formed by the hazardous chemical storage tank 7 being connected to the hazardous chemical delivery pump through a pipeline, a hazardous chemical storage tank root cut-off valve 9 is arranged between the buffer and the hazardous chemical storage tank 7, and a hazardous chemical delivery pump cut-off valve 10 is arranged between the buffer and the hazardous chemical delivery pump.

[0045] The working process and principle of the present invention are as follows: the pressure relief airbag is filled with pressurized inert gas, so that the pressure inside the airbag is close to or slightly higher than the pressure of the material in the material conveying pipeline. The outer wall of the airbag is in contact with the material in the buffer space. When the material in the material conveying pipeline is not pressurized or is normally pressurized, the airbag is always full; when the material in the material conveying pipeline is higher than the pressure, the airbag contracts, thereby achieving the purpose of relieving the pressure of the material conveying pipeline; in addition, when the valve is suddenly closed during the material conveying process, the impact force (water hammer effect) generated by the inertia of the material in the pipeline can also be buffered by this device.

[0046] In summary, the present invention uses nitrogen as an inert gas as a buffer gas, which has a small usage amount, low operating cost, a relatively safe use process, a reduced risk of leakage of hazardous chemicals, and the emission of the inert gas itself does not pollute the environment.

Claims

1. A method for stable transportation of hazardous chemicals, characterized in that: The method includes: By setting buffers on hazardous chemical delivery pipelines, hazardous chemicals can be delivered stably; A pressure relief air bag (3) is provided inside the buffer housing, and pressurized inert gas is filled in through an inert gas filling port (1) provided on the top of the housing; An airbag pressure display gauge (2) is provided on the pressure relief airbag 3 so that the pressure in the pressure relief airbag (3) is close to or slightly higher than the pressure of the material in the material conveying pipeline; A hazardous chemical buffer space (4) is provided below the pressure relief airbag (3), so that the outer wall of the pressure relief airbag (3) contacts the material in the hazardous chemical buffer space (4); The pressure relief airbag (3) performs the following actions: When the material in the material conveying pipeline is not under pressure or is under normal pressure, the pressure relief air bag (3) is always full; When the material in the material conveying pipeline is higher than the pressure, the pressure relief airbag (3) contracts, and the hazardous chemicals enter the hazardous chemicals buffer space through the bottom pipe of the buffer, thereby relieving the pressure of the material conveying pipeline; The material conveying pipeline is a pipeline formed by connecting the hazardous chemical storage tank (7) to the hazardous chemical conveying pump through a pipeline.

2. The method for stable transportation of hazardous chemicals according to claim 1, characterized in that: By installing a buffer on the hazardous chemical transportation pipeline, when the valve is suddenly closed during the material transportation process, the water hammer effect of the impact force generated by the inertia of the material in the pipeline is buffered.

3. The buffer for stable transportation of hazardous chemicals according to claim 1, characterized in that: The buffer comprises: a housing; The top of the shell is respectively provided with an inert gas filling port (1), an air bag pressure display gauge (2), and an air bag pressure relief pipeline (6); A pressure relief airbag (3) and a hazardous chemical buffer space (4) are provided inside the housing; the hazardous chemical buffer space (4) is provided below the pressure relief airbag (3), is filled with hazardous chemicals and is in direct contact with the outside of the pressure relief airbag 3; A pressure relief device root valve (5) is provided at the bottom of the shell; The pressure relief air bag (3) is arranged above the interior of the shell, and the pressure relief air bag (3) is filled with inert gas and has a certain safety pressure.

4. The buffer for stable transportation of hazardous chemicals according to claim 3 is characterized in that: The pressure relief air bag (3) is a cylinder with a height of 50CM and a diameter of 30CM.

5. The buffer for stable transportation of hazardous chemicals according to claim 3, characterized in that: The volume of the pressure relief airbag (3) when the airbag is inflated and pressurized is 3 / 4 times the buffer space of the hazardous chemicals.

6. The buffer for stable transportation of hazardous chemicals according to claim 3, characterized in that: The bottom of the shell is provided with a hazardous chemical drainage drain (8).

7. The buffer for stable transportation of hazardous chemicals according to claim 3, characterized in that: The inert gas filling port (1) is connected to an inert gas pipeline, and the actual pressure of the pressure relief airbag (3) is set according to the material properties.

8. The buffer for stable transportation of hazardous chemicals according to claim 3, characterized in that: A buffer is provided on a pipeline formed by connecting the hazardous chemical storage tank (7) to a hazardous chemical delivery pump through a pipeline, a hazardous chemical storage tank root cut-off valve (9) is provided between the buffer and the hazardous chemical storage tank (7), and a hazardous chemical delivery pump cut-off valve (10) is provided between the buffer and the hazardous chemical delivery pump.

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