Storage tank gas recovery device and storage tank gas recovery system

Abstract

The utility model relates to a storage tank gas recovery device and a storage tank gas recovery system.The storage tank gas recovery device comprises a first pipeline, a second pipeline, a gas collection part, a controller, a first adjusting valve and a second adjusting valve, and the first adjusting valve and the second adjusting valve are in signal connection with the controller; the first pipeline is communicated with an air source and is provided with at least two air supply branch pipes which are arranged in parallel, and the air supply branch pipes are used for being communicated with an air inlet of a storage tank; the second pipeline is communicated with the air collecting part and is provided with at least two air exhaust branch pipes arranged in parallel, the air exhaust branch pipes are used for being communicated with an air outlet of the storage tank, the number of the air supply branch pipes is the same as that of the air exhaust branch pipes, the second pipeline is provided with a first pressure detection device, and the first pressure detection device is located on the downstream side of each air exhaust branch pipe; and the first pressure detection device is in signal connection with the controller. According to the storage tank gas recovery device, gas in the storage tank can be smoothly recovered, meanwhile, stable and safe pressure in the storage tank is ensured, and the cost can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of gas recovery, and particularly relates to a storage tank gas recovery device and a storage tank gas recovery system. Background Art

[0002] A large amount of volatile organic compounds (VOCs) will volatilize from raw material storage tanks in the petrochemical and metallurgical industries. Since VOCs are industrial waste gases, if production enterprises directly discharge them into the atmosphere without VOCs treatment, it will cause smog and photochemical smog, which will not only pollute the surrounding atmospheric environment but also cause toxic reactions after being inhaled by the human body.

[0003] In the prior art, the main method for metallurgical enterprises to treat VOCs is to hermetically collect the VOCs volatilized in the storage tank container and then centrally process them. During the process of collecting VOCs, it is necessary to supplement gas into the storage tank to balance the pressure in the storage tank.

[0004] However, in practice, situations such as unstable pressure regulation, overpressure explosion of the storage tank, or low-pressure damage of the storage tank often occur. To make the pressure in the storage tank stable, a variety of monitoring components and control components are set to detect and control the pressure conditions in each storage tank, and the overall structure is complex and the cost is relatively high.

[0005] Therefore, how to smoothly recover the gas in the storage tank while ensuring the stability and safety of the pressure in the storage tank and reducing the cost is a technical problem that needs to be urgently solved by those skilled in the art. Content of the Utility Model

[0006] The purpose of the present application is to provide a storage tank gas recovery device and a storage tank gas recovery system, which can smoothly recover the gas in the storage tank while ensuring the stability and safety of the pressure in the storage tank and reducing the cost.

[0007] To solve the above technical problems, the present application provides a storage tank gas recovery device, including a first pipeline, a second pipeline, a gas collection part, a controller, and a first regulating valve and a second regulating valve respectively connected to the controller in a signal connection. The controller is used to control the opening degrees of the first regulating valve and the second regulating valve; the first pipeline is communicated with a gas source and is provided with at least two supply branches arranged in parallel, and the supply branches are used to be communicated with the air inlet of the storage tank; the second pipeline is communicated with the gas collection part and is provided with at least two extraction branches arranged in parallel, and the extraction branches are used to be communicated with the air outlet of the storage tank. The number of the supply branches is the same as that of the extraction branches. The second pipeline is provided with a first pressure detection device, and the first pressure detection device is located on the downstream side of each extraction branch and is connected to the controller in a signal connection.

[0008] The first pressure detection device is connected to the controller by signal. The controller can obtain the overall gas recovery situation in the storage tank gas recovery system according to the detection result of the first pressure detection device. A first regulating valve is provided on the first pipeline for regulating the gas supply situation, and a second regulating valve is provided on the second pipeline for regulating the gas recovery situation of the storage tank. The first regulating valve and the second regulating valve are respectively connected to the controller by signal. The controller can control the opening degrees of the first regulating valve and the second regulating valve according to the detection result of the first pressure detection device, so as to adjust the gas pressure in the storage tank and ensure the overall stability of the system.

[0009] If the detection result of the first pressure detection device is within the preset range, it indicates that the gas recovery situation in the storage tank gas recovery system is normal and stable. If the detection result of the first pressure detection device exceeds the preset range, it indicates that the gas recovery situation in the storage tank gas recovery system is abnormal. The controller can judge the abnormal situation according to the size of the detection result, and adjust the gas supply and extraction situations through the first regulating valve and the second regulating valve, so as to eliminate the abnormal situation and ensure the stable gas recovery of the overall system.

[0010] If the pressure detected by the first pressure detection device is large and exceeds the preset range, the opening degree of the second regulating valve can be increased and / or the opening degree of the first regulating valve can be decreased, so that the extraction speed of the recovered gas increases and the gas supply speed slows down, that is, the gas supply volume decreases and the extraction volume increases, to avoid overpressure explosion caused by excessive gas pressure in the storage tank. If the pressure detected by the first pressure detection device is small and exceeds the preset range, the opening degree of the second regulating valve can be decreased and / or the opening degree of the first regulating valve can be increased, so that the extraction speed of the recovered gas slows down and the gas supply speed increases, that is, the gas supply volume increases and the extraction volume decreases, to avoid low-pressure damage caused by too small gas pressure in the storage tank.

[0011] Therefore, the storage tank gas recovery device and the storage tank gas recovery system provided in this embodiment can effectively recover the gas in the storage tank while balancing the pressure in the storage tank and maintaining it within the preset range, thereby ensuring safety.

[0012] Moreover, in this application, only one first pressure detection device provided on the second pipeline is used to monitor the gas recovery situations of each storage tank in the entire gas recovery system, and the gas supply volume and the gas recovery volume are adjusted according to the detection result of the first pressure detection device to ensure the system stability, without separately detecting the pressures in each storage tank. In this way, the overall structure can be simplified and the cost can be effectively reduced.

[0013] Optionally, it further includes a gas supply part, and the gas supply part stores inert gas and forms the gas source.

[0014] Optionally, the first pipeline is provided with a second pressure detection device for detecting the pressure on the outlet side of the air supply part, and the air supply part is in signal connection with the controller.

[0015] Optionally, it further includes at least two liquid level transmitters, the number of the liquid level transmitters being the same as that of the air supply branch pipes. The liquid level transmitters are used for detecting the liquid level in the storage tank, and each of the liquid level transmitters is in signal connection with the controller.

[0016] Optionally, the controller is a robust controller.

[0017] Optionally, each of the air supply branch pipes and each of the air extraction branch pipes are further respectively provided with a one-way valve, and the flow direction of the one-way valve is the same as the air flow direction.

[0018] Optionally, each of the air supply branch pipes and each of the air extraction branch pipes are further respectively provided with a switching valve.

[0019] Optionally, it further includes an alarm component, and the alarm component is in signal connection with the controller. When the detection result of the first pressure detection device is greater than the upper limit value or less than the lower limit value, the controller controls the alarm component to send an alarm signal.

[0020] Optionally, an exhaust fan is further arranged on the second pipeline.

[0021] The present application further provides a storage tank gas recovery system, including a plurality of storage tanks and the storage tank gas recovery device as described above.

[0022] For the storage tank gas recovery system having the above storage tank gas recovery device, its technical effects are similar to those of the above storage tank gas recovery device. For the sake of brevity, they will not be elaborated here. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the storage tank gas recovery device.

[0024] Att Figure 1 In the drawings, the reference numerals are described as follows:

[0025] 1 First pipeline, 11 Air supply branch pipe;

[0026] 2 Second pipeline, 21 Air extraction branch pipe;

[0027] 3 Gas collection part;

[0028] 4 Air supply part;

[0029] 5 Controller;

[0030] 61 First regulating valve, 62 Second regulating valve;

[0031] 7 Storage tank;

[0032] 81 First pressure detection device, 82 second pressure detection device;

[0033] 9 Liquid level transmitter;

[0034] 10 Exhaust fan. Detailed implementation manners

[0035] To enable those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] The embodiment of the present application provides a storage tank gas recovery device and a storage tank gas recovery system. Among them, the storage tank gas recovery system includes a storage tank 7 and a storage tank gas recovery device. The storage tank 7 refers to a device for storing various liquid raw materials, semi-finished products or finished products. Liquids are prone to generate volatile organic compounds (VOCs). For example, a large amount of volatile organic compounds VOCs will volatilize from the raw material storage tank 7 in the petrochemical and metallurgical industries. Since VOCs are industrial waste gases, if production enterprises directly discharge them into the atmosphere without VOCs treatment, it will cause smog and photochemical smog, which will not only pollute the surrounding atmospheric environment but also cause poisoning reactions after being inhaled by the human body. The storage tank gas recovery device is used to recover the gas in the storage tank 7 and perform centralized treatment.

[0037] The storage tank gas recovery device is used to recover the gas in the storage tank 7. At the same time, it will also supplement gas into the storage tank 7 to control the pressure in the storage tank 7, so that the gas pressure in the storage tank 7 is maintained within a preset range, avoiding the situation of overpressure explosion caused by excessive gas pressure in the storage tank 7, and at the same time, it can also avoid the situation of low-pressure damage caused by too low gas pressure in the storage tank 7, ensuring the stability of the storage tank 7 gas recovery.

[0038] As Figure 1 shown, the storage tank gas recovery device further includes a gas collection part 3, a first pipeline 1, a second pipeline 2, a controller 5, a first regulating valve 61 and a second regulating valve 62. Among them, the intake end of the first pipeline 1 is communicated with the gas source, and the outlet end of the first pipeline 1 is provided with a gas supply branch pipe 11, and the gas supply branch pipe 11 is used to communicate with the intake port of the storage tank 7. The outlet end of the second pipeline 2 is communicated with the gas collection part 3, and the intake end of the second pipeline 2 is provided with an air extraction branch pipe 21, and the air extraction branch pipe 21 is used to communicate with the outlet port of the storage tank 7. The gas generated in the storage tank 7 can be extracted from the air extraction branch pipe 21 to the gas collection part 3 and then centralizedly processed.

[0039] The first pipeline 1 is provided with at least two gas supply branch pipes 11, and the second pipeline 2 is provided with at least two gas extraction branch pipes 21. The number of the gas supply branch pipes 11 is the same as that of the gas extraction branch pipes 21. One gas supply branch pipe 11 and one gas extraction branch pipe 21 are respectively connected to the gas inlet and the gas outlet of a storage tank 7. Therefore, this storage tank gas recovery device can simultaneously perform gas recovery operations on at least two storage tanks 7, with relatively high efficiency. Moreover, the second pipeline 2 is provided with a first pressure detection device 81 for detecting the gas pressure in the second pipeline 2. Specifically, the first pressure detection device 81 is arranged on the side close to the gas collection part 3, that is, the first pressure detection device 81 is arranged on the downstream side of all the gas extraction branch pipes 21 for detecting the total gas extraction pressure in the second pipeline 2.

[0040] The first pressure detection device 81 is signal-connected to the controller 5. The controller 5 can know the overall gas recovery situation in the storage tank gas recovery system according to the detection result of the first pressure detection device 81. The first pipeline 1 is provided with a first regulating valve 61 for regulating the gas supply situation, and the second pipeline 2 is provided with a second regulating valve 62 for regulating the gas recovery situation of the storage tank 7. The first regulating valve 61 and the second regulating valve 62 are respectively signal-connected to the controller 5. The controller 5 can control the opening degrees of the first regulating valve 61 and the second regulating valve 62 according to the detection result of the first pressure detection device 81, so as to adjust the gas pressure in the storage tank 7 and ensure the overall stability of the system.

[0041] If the detection result of the first pressure detection device 81 is within the preset range, it indicates that the gas recovery situation in the storage tank gas recovery system is normal and stable. If the detection result of the first pressure detection device 81 exceeds the preset range, it indicates that the gas recovery situation in the storage tank gas recovery system is abnormal. The controller 5 can judge the abnormal situation according to the size of the detection result, and adjust the gas supply and extraction situations through the first regulating valve 61 and the second regulating valve 62, so as to eliminate the abnormal situation and ensure the stable gas recovery of the overall system.

[0042] If the pressure detected by the first pressure detection device 81 is relatively large and exceeds the preset range, the opening degree of the second regulating valve 62 can be increased and / or the opening degree of the first regulating valve 61 can be decreased, so that the extraction speed of the recovered gas increases and the gas supply speed slows down, that is, the gas supply volume decreases and the gas extraction volume increases, to avoid overpressure explosion caused by excessive gas pressure in the storage tank 7. If the pressure detected by the first pressure detection device 81 is relatively small and exceeds the preset range, the opening degree of the second regulating valve 62 can be decreased and / or the opening degree of the first regulating valve 61 can be increased, so that the extraction speed of the recovered gas slows down and the gas supply speed increases, that is, the gas supply volume increases and the gas extraction volume decreases, to avoid low-pressure damage caused by too low gas pressure in the storage tank 7.

[0043] Therefore, the storage tank gas recovery device and the storage tank gas recovery system provided by this embodiment can effectively recover the gas in the storage tank 7 while balancing the pressure in the storage tank 7 and maintaining it within a preset range, thereby ensuring safety.

[0044] Moreover, in this embodiment, only one first pressure detection device 81 provided on the second pipeline 2 is used to monitor the gas recovery situation of each storage tank 7 in the entire gas recovery system, and the gas supply volume and gas recovery volume are adjusted according to the detection result of the first pressure detection device 81 to ensure the system stability. There is no need to detect the pressure in each storage tank 7 separately, thus simplifying the overall structure and effectively reducing costs.

[0045] Certainly, if the controller 5 cannot adjust the gas pressure in the second pipeline 2 to reach the preset range through the control of the first regulating valve 61 and the second regulating valve 62 according to the pressure information detected by the first pressure detection device 81, an alarm signal can also be sent to the operator, such as an acoustic and optical signal, a text signal, etc., so as to facilitate the operator to promptly learn about the abnormal situation and handle it in a timely manner.

[0046] Therefore, the storage tank gas recovery device provided by this embodiment may further include an alarm component (not shown in the figure), which is signal-connected to the controller 5. When the pressure information detected by the first pressure detection device 81 exceeds the alarm condition, the alarm component will send an alarm signal. The alarm condition includes an upper limit value and a lower limit value. When the detected pressure result of the first pressure detection device 81 is greater than the upper limit value or less than the lower limit value, the controller 5 controls the alarm component to send an alarm signal, and the specific upper limit value and lower limit value can be determined according to the actual situation.

[0047] As Figure 1 shown, the storage tank gas recovery device further includes a gas supply part 4, which stores inert gas and forms the above-mentioned gas source. The first pipeline 1 is communicated with the gas supply part 4, and the gas supply part 4 can supply inert gas such as nitrogen, argon, etc. to each storage tank 7 through the first pipeline 1. Of course, it can also be that the external ambient air forms the gas source, and the first pipeline 1 is directly communicated with the external ambient air to introduce the external ambient air into the storage tank 7 to balance the pressure. Comparing the scheme of introducing inert gas into the storage tank 7 with the scheme of directly introducing air into the storage tank 7, the safety can be improved.

[0048] The inert gas in the gas supply part 4 is compressed gas. Such a setting can improve the flexibility of pressure regulation in the storage tank 7.

[0049] As Figure 1As shown, the first pipeline 1 is also provided with a second pressure detection device 82, which is arranged near the air supply part 4, used to detect the pressure on the outlet side of the air supply part 4, and is signal-connected to the controller 5. Through this second pressure detection device 82, the pressure of the gas source can be detected. If an abnormality occurs, it can be replaced and repaired in time to ensure normal air supply, and further ensure stable pressure regulation in the storage tank 7.

[0050] As Figure 1 shown, the storage tank gas recovery device further includes a liquid level transmitter 9. The number of liquid level transmitters 9 is at least two, and is the same as the number of the air supply branch pipes 11 and the air extraction branch pipes 21. The liquid level transmitter 9 is used to detect the liquid level height in the storage tank 7, and each liquid level transmitter 9 is respectively signal-connected to the controller 5. There is a certain relationship between the liquid level in the storage tank 7 and the VOCs gas generation amount. For example, when the liquid level height in the storage tank 7 is relatively high, the gas generation amount in the storage tank 7 will be relatively small, and the air extraction flow rate can be set appropriately smaller. Correspondingly, the air supply flow rate is also appropriately reduced. In this way, the air supply cost can be reduced and the economy can be improved.

[0051] In this embodiment, each component is signal-connected to the controller 5. Specifically, it can be a wired connection or a wireless connection (such as Bluetooth connection, WiFi connection, etc.). How the controller 5 obtains the pressure of the second pipeline 2 according to the first pressure detection device 81, obtains the liquid level height in each storage tank 7 according to the liquid level transmitter 9, and controls the opening degrees of the first regulating valve 61 and the second regulating valve 62 according to the pressure in the second pipeline 2 and the liquid level height in each storage tank 7 is already well-known prior art for those skilled in the art. To save space, it will not be elaborated here.

[0052] In this embodiment, the controller 5 is a robust controller 5. A robust controller 5 refers to a fixed controller 5 designed with the robustness of the closed-loop system as the goal, which maintains certain performance characteristics under certain (structural, size) parameter perturbations. Of course, this air conditioner can also be a PID controller 5. When a robust controller 5 is adopted, its intelligence is better and its anti-interference ability is better.

[0053] In this embodiment, each air supply branch pipe 11 and air extraction branch pipe 21 are respectively provided with a one-way valve (not shown in the figure). The flow direction of the one-way valve is the same as the air flow direction. That is to say, the flow direction of the one-way valve arranged on the air supply branch pipe 11 is from the air supply part 4 to the storage tank 7, and the flow direction of the one-way valve arranged on the air extraction branch pipe 21 is from the storage tank 7 to the air extraction part. The setting of the one-way valve can prevent the occurrence of gas backflow, prevent the gas in the storage tank 7 from flowing back along the air supply branch pipe 11 to the air supply part 4, or prevent the gas in the air extraction pipeline from flowing back into the storage tank 7, and ensure the stable operation of the overall system.

[0054] In this embodiment, each gas supply branch pipe 11 and each air extraction branch pipe 21 are respectively provided with a switching valve (not shown in the figure). The switching valve is used to control the on-off of the air flow in the branch pipe. Specifically, when a certain storage tank 7 fails, or when the number of used storage tanks 7 is less than the number of gas supply branch pipes 11 and air extraction branch pipes 21, the switching valves provided on the unused gas supply branch pipes 11 and air extraction branch pipes 21 are closed and disconnected. With such a setting, the flexibility of the storage tank gas recovery device is better.

[0055] As Figure 1 shown, the second pipeline 2 is further provided with an exhaust fan 10. The exhaust fan 10 is located on one side close to the gas collection part 3, that is, on the downstream side of each air extraction branch pipe 21, and is used to provide power for the gas flow in the system.

[0056] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art of the present technology, several improvements and refinements can be made without departing from the principle of the present application, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A storage tank gas recovery device, characterized in that, It includes a first pipeline (1), a second pipeline (2), a gas collection part (3), a controller (5), a first regulating valve (61) and a second regulating valve (62) which are respectively connected to the controller (5) in a signal connection manner. The controller (5) is used to control the opening degrees of the first regulating valve (61) and the second regulating valve (62). The first pipeline (1) is communicated with a gas source and is provided with at least two air supply branch pipes (11) arranged in parallel. The air supply branch pipes (11) are used to be communicated with the air inlet of a storage tank (7). The second pipeline (2) is communicated with the gas collection part (3) and is provided with at least two air extraction branch pipes (21) arranged in parallel. The air extraction branch pipes (21) are used to be communicated with the air outlet of the storage tank (7). The number of the air supply branch pipes (11) is the same as that of the air extraction branch pipes (21). The second pipeline (2) is provided with a first pressure detection device (81). The first pressure detection device (81) is located on the downstream side of each air extraction branch pipe (21), and the first pressure detection device (81) is connected to the controller (5) in a signal connection manner.

2. The storage tank gas recovery device according to claim 1, wherein It further includes an air supply part (4). The air supply part (4) stores an inert gas and forms the gas source.

3. The storage tank gas recovery device according to claim 2, characterized in that, The first pipeline (1) is provided with a second pressure detection device (82) for detecting the pressure on the outlet side of the air supply part (4). The air supply part (4) is connected to the controller (5) in a signal connection manner.

4. The storage tank gas recovery device according to any one of claims 1-3, characterized in that, It further includes at least two liquid level transmitters (9). The number of the liquid level transmitters (9) is the same as that of the air supply branch pipes (11). The liquid level transmitters (9) are used to detect the liquid level in the storage tank (7), and each liquid level transmitter (9) is respectively connected to the controller (5) in a signal connection manner.

5. The storage tank gas recovery device according to any one of claims 1-3, characterized in that, The controller (5) is a robust controller (5).

6. The storage tank gas recovery device according to any one of claims 1-3, characterized in that, Each of the air supply branch pipes (11) and each of the air extraction branch pipes (21) are further respectively provided with a check valve. The flow direction of the check valve is the same as the air flow direction.

7. The storage tank gas recovery device according to any one of claims 1-3, characterized in that, Each of the air supply branch pipes (11) and each of the air extraction branch pipes (21) are further respectively provided with a switching valve.

8. The storage tank gas recovery device according to any one of claims 1-3, characterized in that, It further includes an alarm component. The alarm component is connected to the controller (5) in a signal connection manner. When the detection result of the first pressure detection device (81) is greater than the upper limit value or less than the lower limit value, the controller (5) controls the alarm component to send an alarm signal.

9. The storage tank gas recovery device according to any one of claims 1-3, characterized in that, The second pipeline (2) is further provided with an exhaust fan (10).

10. A storage tank gas recovery system, characterized in that, It includes a plurality of storage tanks (7) and a storage tank gas recovery device according to any one of claims 1-9.

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