Dispersing device for eliminating oil injection of blow-down pipe of CNG (compressed natural gas) filling station

Abstract

The invention relates to the technical field of emptying treatment of gas stations, in particular to a dispersing device for eliminating oil injection of an emptying pipe of a CNG (compressed natural gas) filling station, which comprises a gas inlet pipe communicated with emptying incoming gas and an emptying pipe communicated with the gas inlet pipe, the upper section of the emptying pipe extends upwards and is used for discharging the emptying gas, and the lower section of the emptying pipe extends upwards and is used for discharging the emptying gas. The lower section of the blow-down pipe extends downwards to be used for collecting liquid substances; the upper section of the blow-down pipe is provided with a separation structure used for gas-liquid separation, and the lower section of the blow-down pipe is provided with an oil blocking structure used for preventing liquid substances from being discharged out of the blow-down pipe. Liquid in a gas-liquid mixture is separated through the separation structure, liquid substances flow downwards and are temporarily stored, meanwhile, the temporarily stored liquid substances and emptying fluid entering the emptying pipe again are separated through the oil blocking structure, the situation that the emptying fluid disturbs airflow and air pressure, and consequently the liquid substances are driven to be discharged is avoided, pollution to the environment is reduced, and the service life of the emptying pipe is prolonged. The economic loss is reduced, and the emptying operation is more economical and environment-friendly.

Description

Technical Field

[0001] The invention relates to the technical field of venting treatment of a gas filling station, and in particular to a venting device for eliminating oil spray from a vent pipe of a CNG gas filling station. Background Art

[0002] In a CNG filling station, the vent pipe is a facility used to release the natural gas in the pipeline and system. The existing anti-scatter pipe is used to connect the venting structure to guide the vented gas to be discharged externally. However, the conventional vent pipe cannot play the role of gas-liquid separation. During the venting process, the oil-water mixture attached to the gas is easily discharged along with the gas; part of the oil-water mixture adheres to the vent pipe wall and accumulates at the bottom of the vent pipe, but during venting, the high-speed fluid will recoil the oil-water mixture accumulated at the bottom of the vent pipe and discharge it from the top of the vent pipe together with the gas, forming "oil rain", which pollutes the vent pipe and the surrounding environment. This situation often occurs when the high-pressure system is discharged, and the pollution caused by the "oil rain" is difficult to clean up, which will cause great economic losses.

[0003] It can be seen that the current CNG filling station venting structure still has room for improvement. It should be adjusted and optimized to improve the gas-liquid separation effect of the venting structure, so that the liquid oil-water mixture can be left in the separation process and only the gas can be discharged to the outside; at the same time, the oil-water mixture can be collected for subsequent unified treatment. Therefore, it is necessary to propose a more reasonable technical solution to solve the technical problems existing in the existing technology. Summary of the invention

[0004] In order to overcome at least one of the defects mentioned above, the present invention proposes a dispersion device that eliminates the oil spraying in the vent pipe of a CNG filling station, and by limiting the flow path of the high-speed fluid, provides more attachment space to promote gas-liquid separation, helps the oil-water mixture to accumulate at the bottom of the vent pipe, and at the same time prevents the high-speed fluid from lifting the accumulated oil-water mixture upward, thereby achieving gas-liquid separation during the venting process, reducing environmental pollution during the venting process, and avoiding economic losses.

[0005] In order to achieve the above-mentioned purpose, the dispersing device disclosed in the present invention can adopt the following technical solutions:

[0006] The invention discloses a dispersion device for eliminating oil spray from a vent pipe of a CNG filling station, comprising an intake pipe for connecting to vent gas, and a vent pipe connected to the intake pipe, wherein the upper section of the vent pipe extends upward and is used to discharge the vent gas, and the lower section of the vent pipe extends downward and is used to collect liquid substances in the vent gas; the upper section of the vent pipe is provided with a separation structure and is used to separate gas from liquid, and the lower section of the vent pipe is provided with an oil blocking structure to prevent liquid substances from being driven out of the vent pipe.

[0007] The above-disclosed scattering device reduces the flow rate of the gas-liquid mixed fluid through the separation structure and changes its flow direction, so that the liquid substance is separated from the gas at the separation structure. After the liquid substance is separated, it flows downward along the wall of the vent pipe to the lowest point and is collected. After a certain amount is collected, it is discharged for sewage treatment; when the high-speed fluid enters the vent pipe, the oil-blocking structure prevents the liquid substance collected at the bottom from being sprayed upward when the fluid is disturbed, thereby avoiding damage to the external environment. The scattering device disclosed in the present invention realizes the gaseous discharge of the vented gas and reduces the pollution of oil.

[0008] Furthermore, the separation structure used in the present invention can be used in a variety of forms to achieve gas-liquid separation. For example, in some schemes, an inclined guide vane structure can be used, and in some schemes, a fan-shaped structure can be used. The specific is not limited to the only one. Here, optimization is made and one of the feasible options is proposed: the separation structure includes a spiral fin structure, which is arranged in the vent pipe and forms a spiral upward channel in the vent pipe. When such a scheme is adopted, the spiral fin structure is a flat thin sheet, which is coiled upward in a spiral manner. The outer edge of the spiral fin is tightly fitted with the inner wall of the pipe. The spiral channel formed by the coiling is used to guide the fluid to coil and rise. During the rising process, the liquid substance moves outward due to centrifugal force and adheres to the pipe wall, and flows downward along the pipe wall and finally converges at the bottom of the vent pipe.

[0009] Furthermore, the spiral fins can be provided in a variety of ways, such as providing fixed limit grooves, limit blocks, etc. on the inner wall of the pipe, which is not specifically limited. Here, an optimization is made and one of the feasible options is proposed: the separation structure includes a separation pipe section connected to the vent pipe, and the spiral fin structure is provided in the separation pipe section. When such a solution is adopted, the length of the separation pipe section is equivalent to the length of the spiral fins, and the separation pipe section is provided at the vent pipe for easy disassembly and maintenance. It is more convenient and reliable to provide a corresponding positioning structure or limit structure in the separation pipe section to connect and fix the spiral fins.

[0010] Furthermore, in the present invention, the connection between the two ends of the separation pipe section needs to be sealed to avoid leakage. The specific sealing method can adopt a variety of schemes and is not limited to the only one. Here, an optimization is made and one feasible option is proposed: the two ends of the separation pipe section are provided with flange structures for connecting to the vent pipe, and a seal is provided between the separation pipe section and the vent pipe. When such a scheme is adopted, the sealing treatment can be performed by components such as sealing gaskets.

[0011] Furthermore, when high-speed fluid enters the vent pipe, it will cause the air flow and air pressure in the vent pipe to be turbulent. In order to prevent the accumulated liquid material inside from spraying upward, it is necessary to block the accumulated liquid material. Here, optimization is performed and one of the feasible options is proposed: the oil-blocking structure includes an oil-blocking member, the edge of which fits the inner wall of the vent pipe and separates the vent pipe, and the oil-blocking member is provided with a through hole to guide the liquid material on the upper part of the oil-blocking member to flow downward into the bottom of the vent pipe. When such a solution is adopted, the oil-blocking member separates the space at the bottom of the vent pipe and forms an independent space for storing liquid material after gas-liquid separation.

[0012] Furthermore, in the present invention, the liquid substance flows from the through hole to the lower space. Specifically, the structure of the through hole is optimized and one feasible option is proposed: the through hole extends downward and is connected to the drainage tube. When such a solution is adopted, the through hole is a straight hole, and the drainage tube extends the extension distance of the through hole. A straight tube or a curved tube can be adopted. When a curved tube is adopted, the drainage tube can better reduce the impact of high-speed fluid on the liquid substance and reduce the probability of liquid substance being discharged outward.

[0013] Furthermore, the structure of the flow blocker can be adjusted and optimized to improve the guidance of the liquid material. The specific structure is not limited to the only one. Here, an optimization is made and one feasible option is proposed: the upper surface of the oil blocker forms a concave drainage surface, and the through hole is located at the lowest point of the drainage surface. When such a solution is adopted, the drainage surface can be set as an inclined straight surface or a curved surface.

[0014] Furthermore, the lower surface of the oil-blocking member and the lower end of the vent pipe form a cavity for collecting liquid substances. In order to improve the blocking effect on liquid substances and prevent them from reaching the outside from the cavity and being discharged from the vent pipe, optimization is performed here and one of the feasible options is proposed: the lower surface of the oil-blocking member forms an oil-blocking surface extending toward the drainage pipe, and the height of the oil-blocking surface gradually decreases and tilts from the lower surface of the oil-blocking member to the drainage pipe, and the lower pipe opening of the drainage pipe is lower than the lowest position of the oil-blocking surface. When such a scheme is adopted, the oil-blocking surface can be an inclined straight surface or an arc-shaped surface.

[0015] Furthermore, in the present invention, the lower end of the vent pipe is used to collect liquid substances, so the following feasible option is proposed: the lower end of the vent pipe forms a sewage collection chamber. When such a solution is adopted, the lower end of the vent pipe is closed, and the liquid substances that pass through the through hole and reach the lower part of the vent pipe are directly collected here.

[0016] Furthermore, when the amount of liquid in the sewage collecting chamber is large, it needs to be cleaned. Here, optimization is performed and one feasible option is proposed: the sewage collecting chamber is connected with a sewage discharge structure.

[0017] Compared with the prior art, some beneficial effects of the technical solution disclosed in the present invention include:

[0018] The present invention separates the liquid in the gas-liquid mixture through a separation structure, allowing the liquid substance to flow downward and be temporarily stored. At the same time, the temporarily stored liquid substance is separated from the venting fluid that re-enters the venting pipe through an oil-blocking structure, thereby preventing the venting fluid from disturbing the airflow and air pressure and causing the liquid substance to be driven out, thereby reducing pollution to the external environment, reducing the economic loss of venting, and making the venting operation more economical and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only represent some embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of the scattering device.

[0021] In the above drawings, the meanings of the various reference numerals are as follows:

[0022] 1. Inlet pipe; 2. Fire-blocking structure; 3. Sewage collecting chamber; 4. Sewage discharge structure; 5. Vent pipe; 6. Oil-blocking structure; 7. Flange structure; 8. Separation pipe section; 9. Spiral fin structure; 10. Seal. DETAILED DESCRIPTION

[0023] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0024] In view of the fact that the current vent pipe structure cannot perform good gas-liquid separation, resulting in a large amount of oil-water mixture in the vent gas, causing environmental pollution and damage, and leading to huge economic losses, the following embodiments are optimized to overcome the defects in the prior art.

[0025] Example

[0026] like Figure 1 As shown, this embodiment provides a dispersion device for eliminating oil spray from the vent pipe 5 of a CNG filling station, including an intake pipe 1 for connecting to the vent gas, and a vent pipe 5 connected to the intake pipe 1, the upper section of the vent pipe 5 extends upward and is used to discharge the vent gas, and the lower section of the vent pipe 5 extends downward to collect liquid substances in the vent gas; the upper section of the vent pipe 5 is provided with a separation structure and is used for gas-liquid separation, and the lower section of the vent pipe 5 is provided with an oil blocking structure 6 to prevent liquid substances from being driven out of the vent pipe 5.

[0027] Preferably, a fire-blocking structure 2 is provided on the air inlet pipe 1, and a flame arrester can be specifically adopted.

[0028] The scattering device disclosed in the present embodiment reduces the flow rate of the gas-liquid mixed fluid through the separation structure and changes its flow direction, so that the liquid substance is separated from the gas at the separation structure. After the liquid substance is separated, it flows downward along the wall of the vent pipe 5 to the lowest point and is collected. After a certain amount is collected, it is discharged for sewage treatment; when the high-speed fluid enters the vent pipe 5, the oil-blocking structure 6 prevents the liquid substance collected at the bottom from being sprayed upward when the fluid is disturbed, thereby avoiding damage to the external environment. The scattering device disclosed in the present invention realizes the gaseous discharge of the vented gas and reduces the pollution of oil.

[0029] The separation structure used in this embodiment can be used in various forms to achieve gas-liquid separation. For example, in some schemes, an inclined guide vane structure can be used, and in some schemes, a fan-shaped structure can be used. The specifics are not limited to the only ones. This embodiment is optimized and proposes one of the feasible options: the separation structure includes a spiral fin structure 9, which is arranged in the vent pipe 5 and forms a spiral ascending channel in the vent pipe 5. When such a scheme is adopted, the spiral fin structure 9 is a flat thin sheet, which is coiled upward in a spiral manner, and the outer edge of the spiral fin is closely attached to the inner wall of the pipe. The spiral channel formed by the coiling is used to guide the fluid to coil and rise. During the ascending process, the liquid substance moves outward due to centrifugal force and adheres to the pipe wall, and flows downward along the pipe wall and finally converges at the bottom of the vent pipe 5.

[0030] Preferably, in this embodiment, the upper and lower ends of the spiral fin structure 9 are connected and fixed to the inner tube wall by fixing rods, and the outer edge of the spiral fin is wrapped with a sealing layer. When the outer edge of the spiral fin contacts and fits the inner tube wall, the sealing layer seals the contact position.

[0031] The spiral fins can be provided in a variety of ways, such as providing fixed limiting grooves, limiting blocks, etc. on the inner wall of the pipe, which is not limited to the specific method. This embodiment is optimized and adopts one of the feasible options: the separation structure includes a separation pipe section 8 connected to the vent pipe 5, and the spiral fin structure 9 is provided in the separation pipe section 8. When such a solution is adopted, the length of the separation pipe section 8 is equivalent to the length of the spiral fins, and the separation pipe section 8 is provided at the vent pipe 5 for easy disassembly and maintenance. It is more convenient and reliable to provide a corresponding positioning structure or limiting structure in the separation pipe section 8 to connect and fix the spiral fins.

[0032] Preferably, the vent pipe 5 and the separation pipe section 8 are both made of metal material, and the diameter of the separation pipe section 8 is equal to the diameter of the vent pipe 5 .

[0033] In this embodiment, the connection between the two ends of the separation pipe section 8 needs to be kept sealed to avoid leakage. The specific sealing method can adopt a variety of schemes, which are not limited to the only one. This embodiment is optimized and adopts one of the feasible options: the two ends of the separation pipe section 8 are provided with flange structures 7 for connecting the vent pipe 5, and a seal 10 is provided between the separation pipe section 8 and the vent pipe 5. When such a scheme is adopted, the sealing treatment can be performed by components such as sealing gaskets.

[0034] Preferably, the flanges at both ends of the separation pipe section 8 are integrally formed.

[0035] When high-speed fluid enters the vent pipe 5, it will cause the air flow and air pressure in the vent pipe 5 to be turbulent. In order to prevent the accumulated liquid material inside from spraying upward, it is necessary to block the accumulated liquid material. This embodiment is optimized and adopts one of the feasible options: the oil-blocking structure 6 includes an oil-blocking member, the edge of which fits the inner wall of the vent pipe 5 and separates the vent pipe 5, and the oil-blocking member is provided with a through hole to guide the liquid material on the upper part of the oil-blocking member to flow downward into the bottom of the vent pipe 5. When such a solution is adopted, the oil-blocking member separates the space at the lower part of the vent pipe 5 and forms an independent space for storing liquid material after gas-liquid separation.

[0036] In this embodiment, the liquid substance flows from the through hole to the lower space. Specifically, the structure of the through hole is optimized and one of the feasible options is adopted: the through hole extends downward and is connected to the drainage tube. When such a solution is adopted, the through hole is a straight hole, and the drainage tube extends the extension distance of the through hole. A straight tube or a curved tube can be used. When a curved tube is used, the drainage tube can better reduce the impact of high-speed fluid on the liquid substance and reduce the probability of liquid substance being discharged outward.

[0037] Preferably, the oil-blocking structure may be constructed as a funnel structure.

[0038] The structure of the flow-blocking member can be adjusted and optimized to improve the guidance of the liquid material. The specific structure is not limited to a single one. Here, an optimization is made and one feasible option is proposed: the upper surface of the oil-blocking member forms a concave drainage surface, and the through hole is located at the lowest point of the drainage surface. When such a solution is adopted, the drainage surface can be set as an inclined straight surface or a curved surface.

[0039] The lower surface of the oil-blocking member and the lower end of the vent pipe 5 form a cavity for collecting liquid substances. In order to improve the blocking effect on liquid substances and prevent them from reaching the outside from the cavity and being discharged from the vent pipe 5, this embodiment is optimized and adopts one of the feasible options: the lower surface of the oil-blocking member forms an oil-blocking surface extending toward the drainage pipe, and the height of the oil-blocking surface gradually decreases and tilts from the lower surface of the oil-blocking member to the drainage pipe, and the lower pipe opening of the drainage pipe is lower than the lowest position of the oil-blocking surface. When such a scheme is adopted, the oil-blocking surface can be an inclined straight surface or an arc-shaped surface.

[0040] In this embodiment, the lower end of the vent pipe 5 is used to collect liquid substances, so the following feasible option can be adopted: the lower end of the vent pipe 5 forms a sewage collecting chamber 3. When such a solution is adopted, the lower end of the vent pipe 5 is closed, and the liquid substances that pass through the through hole and reach the lower part of the vent pipe 5 are directly collected here.

[0041] When the amount of liquid in the dirt collecting chamber 3 is large, it needs to be cleaned. This embodiment is optimized and adopts one of the feasible options: the dirt collecting chamber 3 is connected to a dirt discharge structure 4.

[0042] Preferably, the sewage discharge structure 4 includes a sewage discharge valve.

[0043] The above are the implementation methods listed in this embodiment, but this embodiment is not limited to the above optional implementation methods. Those skilled in the art can arbitrarily combine the above methods to obtain other various implementation methods. Anyone can derive other various implementation methods under the inspiration of this embodiment. The above specific implementation methods should not be understood as limiting the protection scope of this embodiment. The protection scope of this embodiment should be based on the definition in the claims.

Claims

1. A device for eliminating oil spray from the vent pipe of a CNG filling station, characterized by: The invention comprises an intake pipe (1) for communicating with venting gas, and a vent pipe (5) communicated with the intake pipe (1); the upper section of the vent pipe (5) extends upward and is used to discharge the venting gas, and the lower section of the vent pipe (5) extends downward and is used to collect liquid substances in the venting gas; the upper section of the vent pipe (5) is provided with a separation structure for performing gas-liquid separation, and the lower section of the vent pipe (5) is provided with an oil-blocking structure (6) for preventing liquid substances from being driven out of the vent pipe (5).

2. The device for eliminating oil spray from the vent pipe of a CNG filling station according to claim 1 is characterized in that: The separation structure comprises a spiral fin structure (9), which is arranged in the venting pipe (5) and forms a spiral ascending channel in the venting pipe (5).

3. The device for eliminating oil spray from the vent pipe of a CNG filling station according to claim 2 is characterized in that: The separation structure comprises a separation pipe section (8) connected to the vent pipe (5), and the spiral fin structure (9) is arranged in the separation pipe section (8).

4. The device for eliminating oil spray from the vent pipe of a CNG filling station according to claim 3 is characterized in that: Both ends of the separation pipe section (8) are provided with flange structures (7) for connecting to the vent pipe (5), and a sealing member (10) is provided between the separation pipe section (8) and the vent pipe (5).

5. The device for eliminating oil spray from the vent pipe of a CNG filling station according to claim 1 is characterized in that: The oil-blocking structure (6) comprises an oil-blocking member, the edge of which fits the inner wall of the vent pipe (5) and blocks the vent pipe (5), and the oil-blocking member is provided with a through hole for guiding the liquid material on the upper part of the oil-blocking member to flow downward into the bottom of the vent pipe (5).

6. The device for eliminating oil spray from the vent pipe of a CNG filling station according to claim 5 is characterized in that: The through hole extends downward and is connected to the drainage tube.

7. The device for eliminating oil spray from the vent pipe of a CNG filling station according to claim 6 is characterized in that: The upper surface of the oil-blocking member forms a concave drainage surface, and the through hole is located at the lowest point of the drainage surface.

8. The device for eliminating oil spray from the vent pipe of a CNG filling station according to claim 6 or 7, characterized in that: The lower surface of the oil blocking member forms an oil blocking surface extending toward the drainage pipe. The height of the oil blocking surface gradually decreases and inclines from the lower surface of the oil blocking member to the drainage pipe. The lower pipe opening of the drainage pipe is lower than the lowest position of the oil blocking surface.

9. The device for eliminating oil spray from the vent pipe of a CNG filling station according to claim 1, characterized in that: The lower end of the vent pipe (5) forms a sewage collecting chamber (3).

10. The device for eliminating oil spray from the vent pipe of a CNG filling station according to claim 9, characterized in that: The sewage collecting chamber (3) is connected to a sewage discharge structure (4).

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