Oil tank vapor recovery system

Abstract

This utility model relates to an oil tank gas recovery system, comprising: at least one storage tank with a pressure relief valve at the top; a first buffer tank connected to the pressure relief valve, with a first pressure reducing component at its inlet; a pressure tank connected to the first buffer tank, with a pressure boosting component between them, and the pressure tank connected to a first recovery channel; and an overpressure buffer tank connected to the pressure tank via a switch valve, and also connected to a second recovery channel. This utility model achieves closed-loop management of oil and gas throughout the entire process through three-stage pressure gradient control of the storage tank, the first buffer tank, the pressure tank, and the overpressure buffer tank, combined with the first and second recovery channels. Oil and gas from the storage tank enter the first buffer tank via the pressure relief valve for pressure stabilization, and after being pressurized by the pressure boosting component, it is transported to the pressure tank for temporary storage and recovery. Overpressured oil and gas are diverted to the overpressure buffer tank for emergency recovery, eliminating the risk of combustion and explosion from direct discharge of oil and gas, while simultaneously reducing oil loss and significantly improving the utilization rate of oil and gas resources.

Description

Technical Field

[0001] This utility model relates to the field of oil storage technology, and in particular to an oil tank oil vapor recovery system. Background Technology

[0002] Currently, during the storage of oil products in tanks, changes in the volume of oil inside the tank cause corresponding fluctuations in the gas pressure. The traditional solution is to install a breather valve on the top of the tank, allowing the oil and gas to be directly released into the atmosphere when the pressure increases. However, this method has drawbacks: the released oil and gas are mostly high-concentration gases, which are flammable and explosive, and can easily cause fires or explosions when exposed to an ignition source. For example, when the tank pressure suddenly increases, the high-concentration oil and gas released through the breather valve can form a dangerous mist in the tank area; the oil and gas are essentially uncondensed petroleum product components, and direct release will result in oil loss. Summary of the Invention

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the safety hazards and resource waste caused by the direct discharge of oil and gas from storage tanks due to pressure fluctuations in the prior art.

[0004] To solve the above-mentioned technical problems, this utility model provides an oil tank oil and gas recovery system, including,

[0005] At least one storage tank, each of which is equipped with a pressure relief valve on its top;

[0006] A first buffer tank is connected to the pressure relief valve, and a first switching valve and a first pressure reducing element are sequentially provided between the first buffer tank and the pressure relief valve.

[0007] A pressure tank is connected to the first buffer tank, and a pressure boosting component is provided between the pressure tank and the first buffer tank. The pressure tank is provided with a first recovery channel.

[0008] An overpressure buffer tank is provided, which is connected to the pressure tank. A second switching valve is provided between the overpressure buffer tank and the pressure tank. The overpressure buffer tank is provided with a second recovery channel.

[0009] In one embodiment of this utility model, the pressure relief valve includes a low-pressure pressure relief valve and a high-pressure pressure relief valve, wherein the opening pressure value of the high-pressure pressure relief valve is greater than the opening pressure value of the low-pressure pressure relief valve, and the first buffer tank is connected to the low-pressure pressure relief valve.

[0010] In one embodiment of the present invention, the first recovery channel includes a gas discharge pipe and a liquid discharge pipe. The gas discharge pipe is disposed at the upper part of the pressure tank and is provided with a third switching valve and a second pressure reducing component. The liquid discharge pipe is disposed at the bottom of the pressure tank and is provided with a fourth switching valve and a third pressure reducing component.

[0011] In one embodiment of this utility model, a fifth switching valve and a fourth pressure reducing element are provided on the second recovery channel.

[0012] In one embodiment of this utility model, the first switching valve is a three-way valve, and the first buffer tank is connected to the pressurizing component and the overpressure buffer tank respectively through the first switching valve.

[0013] In one embodiment of the present invention, the storage tank includes a first storage tank and a second storage tank, and the pressure relief valves of the first storage tank and the second storage tank are connected in parallel at the front end of the first pressure reducing element.

[0014] In one embodiment of this utility model, a reflux pipe is further connected between the pressure tank and the first buffer tank, and a sixth switching valve is provided on the reflux pipe.

[0015] In one embodiment of this utility model, pressure sensors are provided in the first buffer tank, the pressure tank, and the overpressure buffer tank.

[0016] In one embodiment of this utility model, the pressurizing component is an air compressor.

[0017] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects:

[0018] This invention utilizes a three-stage series pressure architecture consisting of a storage tank, a first buffer tank, a pressure tank, and an overpressure buffer tank to achieve fully enclosed management and safe, efficient recovery of oil and gas. Oil and gas in the storage tank first enter the first buffer tank via a pressure relief valve for pressure buffering. A pressurizing component then pressurizes the stabilized oil and gas and delivers it to the pressure tank for compression and temporary storage. Normal oil and gas recovery is achieved through the first recovery channel of the pressure tank. When the system pressure abnormally increases, the overpressure oil and gas is diverted to the overpressure buffer tank for temporary storage and finally independently output and recovered through the second recovery channel of the overpressure buffer tank. This solution eliminates the risk of combustion and explosion associated with direct discharge of oil and gas via traditional breather valves. Furthermore, through pressure gradient control and redundant recovery paths, it ensures that oil and gas under different operating conditions are recovered in a closed manner, significantly reducing oil evaporation losses and improving resource utilization. Attached Figure Description

[0019] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the oil tank oil and gas recovery system in an embodiment of this utility model.

[0021] Explanation of reference numerals in the accompanying drawings: 100, storage tank; 200, first buffer tank; 300, pressure tank; 400, overpressure buffer tank; 101, first storage tank; 102, second storage tank; 103, low-pressure relief valve; 104, high-pressure relief valve; 105, first pressure reducing element; 201, first switching valve; 202, pressurizing element; 301, sixth switching valve; 302, reflux pipe; 303, second switching valve; 310, gas discharge pipe; 311, second pressure reducing element; 312, third switching valve; 320, liquid discharge pipe; 321, third pressure reducing element; 322, fourth switching valve; 401, fourth pressure reducing element; 402, fifth switching valve; 410, second recovery channel. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0023] Reference Figure 1 As shown, the oil tank oil and gas recovery system of this utility model is characterized by comprising: at least one storage tank 100, each of which is provided with a pressure relief valve at its top; a first buffer tank 200, which is connected to the pressure relief valve, wherein a first switching valve 201 and a first pressure reducing component 105 are sequentially provided between the first buffer tank 200 and the pressure relief valve; a pressure tank 300, which is connected to the first buffer tank 200, wherein a pressure boosting component 202 is provided between the pressure tank 300 and the first buffer tank 200, and a first recovery channel is provided on the pressure tank 300; and an overpressure buffer tank 400, which is connected to the pressure tank 300, wherein a second switching valve 303 is provided between the overpressure buffer tank 400 and the pressure tank 300, and a second recovery channel 410 is provided on the overpressure buffer tank 400.

[0024] The oil tank gas recovery system in this embodiment directs the overflowing oil and gas from storage tank 100 to the first buffer tank 200 for temporary storage, avoiding the risk of combustion and explosion caused by direct discharge. When the amount of oil and gas exceeds the capacity of the first buffer tank 200, the pressurization component 202 automatically starts and compresses the oil and gas to a high-density state for storage in the pressure tank 300. The overpressured oil and gas after the pressure tank 300 is full is safely received by the overpressure buffer tank 400, thus constructing a three-level pressure fault-tolerant system of storage tank 100-first buffer tank 200-pressure tank 300-overpressure buffer tank 400, reducing the probability of explosion accidents caused by pressure runaway. At the same time, the first recovery channel and the second recovery channel 410 can transport the excess oil and gas to the recovery pipeline network to realize the recycling of volatile resources, reducing the oil and gas loss rate while ensuring safety.

[0025] It should be noted that all components in the oil tank oil and gas recovery system of this embodiment are connected by pipelines.

[0026] In order to utilize the pressure difference to achieve internal circulation of oil and gas and improve recovery efficiency, in the oil tank oil and gas recovery system of this embodiment, the storage tank 100 includes a first storage tank 101 and a second storage tank 102, and the pressure relief valves of the first storage tank 101 and the second storage tank 102 are connected in parallel to the front end of the first pressure reducing component 105.

[0027] The pressure fluctuations of the first storage tank 101 and the second storage tank 102 are complementary during use. When the first storage tank 101 generates high-pressure oil and gas due to oil unloading operations, the second storage tank 102 may be in a low-pressure state during the oil loading stage. At this time, the oil and gas overflowing from the first storage tank 101 can be returned to the low-pressure second storage tank 102, and vice versa. This design effectively utilizes the pressure difference between the two storage tanks 100 to achieve internal circulation and reuse of oil and gas, while avoiding frequent start-ups and shutdowns of the system due to sudden pressure changes in a single tank.

[0028] In this embodiment, the pressure relief valve in the oil tank oil and gas recovery system includes a low-pressure pressure relief valve 103 and a high-pressure pressure relief valve 104. The opening pressure of the high-pressure pressure relief valve 104 is greater than the opening pressure of the low-pressure pressure relief valve 103. The first buffer tank 200 is connected to the low-pressure pressure relief valve 103.

[0029] Specifically, in this embodiment, the top of each storage tank 100 is equipped with a low-pressure relief valve 103 and a high-pressure relief valve 104. These two valves have different opening thresholds. The low-pressure relief valve 103 opens first when normal pressure fluctuations occur within the storage tank 100, and the pressure is slightly higher than normal, smoothly guiding excess oil and gas into the first buffer tank 200 for routine recovery. The high-pressure relief valve 104 remains closed, only opening momentarily when the pressure in the storage tank 100 surges due to abnormal operating conditions or sudden oil inflow, reaching the safety limit, thus preventing overpressure explosion of the tank. The stepped action of the two-stage valves ensures that oil and gas are continuously recovered through the low-pressure channel under most operating conditions, while retaining the high-pressure channel as a safety guarantee.

[0030] Specifically, the pressurizing component 202 is an air compressor. When the pressure sensor in the first buffer tank 200 detects that the pressure in the first buffer tank 200 is too high, the pressurizing component 202 compresses the oil and gas in the first buffer tank 200 into the pressure tank 300 for storage.

[0031] A return pipe 302 is also connected between the pressure tank 300 and the first buffer tank 200. A sixth switch valve 301 is provided on the return pipe 302. When there is too much oil and gas stored inside the pressure tank 300, the pressure tank 300 can also return the high-pressure oil and gas inside to the first buffer tank 200 through the sixth switch valve 301.

[0032] In practical use, the working process of the oil tank oil and gas recovery system is as follows: after the system is started, when the pressure in the storage tank 100 reaches the set value of the low pressure relief valve 103 due to oil inlet or temperature rise, it will be automatically opened. The oil and gas will first be reduced to a safe low pressure through the first pressure reducing element 105, and then smoothly enter the first buffer tank 200.

[0033] The pressure tank 300 is provided with a first recovery channel, which includes a gas discharge pipe 310 and a liquid discharge pipe 320. The gas discharge pipe 310 is located at the upper part of the pressure tank 300 and is provided with a third switching valve 312 and a second pressure reducing element 311. The liquid discharge pipe 320 is located at the bottom of the pressure tank 300 and is provided with a fourth switching valve 322 and a third pressure reducing element 321.

[0034] The gas discharge pipe 310 is located at the top of the pressure tank 300, and the liquid discharge pipe 320 is located at the bottom of the pressure tank 300. When the pressure tank 300 approaches its upper limit due to continuous compression, the first recovery channel of the pressure tank 300 is opened to recover the collected oil and gas or condensed liquid. The gas discharge pipe 310 and the liquid discharge pipe 320 are respectively equipped with a switch valve and a pressure reducing device. This arrangement allows the oil and gas in the pressure tank 300 to be sent to the plant gas network or centralized treatment device after pressure reduction treatment. The oil can be collected and filled separately, or a connecting pipe can be added to directly discharge it back into the storage tank 100.

[0035] The overpressure buffer tank 400 is provided with a second recovery channel 410, and a fifth switching valve 402 and a fourth pressure reducing component 401 are provided on the second recovery channel 410.

[0036] Furthermore, the first switching valve 201 is a three-way valve, and the first buffer tank 200 is connected to the pressurizing component 202 and the overpressure buffer tank 400 respectively through the first switching valve 201. The pressure tank 300 is connected to the overpressure buffer tank 400 and is provided with a second switching valve 303.

[0037] Specifically, a first switching valve 201 is installed on the pipeline between the first buffer tank 200 and the overpressure buffer tank 400. The front end of the pressurizing component 202 is connected to the first buffer tank 200 through the first switching valve 201. If the pressure of the first buffer tank 200 or the pressure tank 300 is too high and suddenly rises to a dangerous level, the high-pressure oil and gas will be introduced into the overpressure buffer tank 400 for safe release, eliminating the risk of explosion. After the pressure is released, through the fifth switching valve 402, the oil and gas in the overpressure buffer tank 400 can be sent to the plant gas network or centralized treatment device after passing through the second recovery channel 410 and the fourth pressure reducing component 401, so as to achieve the final recovery of resources.

[0038] In addition, pressure sensors are installed in the first buffer tank 200, pressure tank 300 and overpressure buffer tank 400. The pressurization component 202 in the system can be electrically controlled, and all switching valves, including three-way valves, are solenoid valves.

[0039] Pressure sensors are installed on the top of the first buffer tank 200, the top of the pressure tank 300, and the top of the overpressure buffer tank 400 to monitor the pressure changes in each tank in real time. The pressure booster 202 and all solenoid valves and sensors are connected to the central controller via cables and are linked to each other based on the real-time data from the pressure sensors.

[0040] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An oil tank oil gas recovery system characterized by comprising: include: At least one storage tank, each of which is equipped with a pressure relief valve on its top; A first buffer tank is connected to the pressure relief valve, and a first switching valve and a first pressure reducing element are sequentially provided between the first buffer tank and the pressure relief valve. A pressure tank is connected to the first buffer tank, and a pressure boosting component is provided between the pressure tank and the first buffer tank. The pressure tank is provided with a first recovery channel. An overpressure buffer tank is provided, which is connected to the pressure tank. A second switching valve is provided between the overpressure buffer tank and the pressure tank. The overpressure buffer tank is provided with a second recovery channel.

2. The tank oil vapor recovery system of claim 1, wherein: The pressure relief valve includes a low-pressure relief valve and a high-pressure relief valve. The opening pressure of the high-pressure relief valve is greater than that of the low-pressure relief valve. The first buffer tank is connected to the low-pressure relief valve.

3. The tank oil vapor recovery system of claim 1, wherein: The first recovery channel includes a gas discharge pipe and a liquid discharge pipe. The gas discharge pipe is located at the upper part of the pressure tank and is equipped with a third switching valve and a second pressure reducing element. The liquid discharge pipe is located at the bottom of the pressure tank and is equipped with a fourth switching valve and a third pressure reducing element.

4. The tank oil vapor recovery system of claim 1, wherein: The second recovery channel is equipped with a fifth switching valve and a fourth pressure reducing element.

5. The tank oil vapor recovery system of claim 1, wherein: The first switching valve is a three-way valve, and the first buffer tank is connected to the pressurizing component and the overpressure buffer tank respectively through the first switching valve.

6. The tank oil vapor recovery system of claim 1, wherein: The storage tank includes a first storage tank and a second storage tank, and the pressure relief valves of the first and second storage tanks are connected in parallel at the front end of the first pressure reducing element.

7. The tank oil vapor recovery system of claim 1, wherein: A reflux pipe is also connected between the pressure tank and the first buffer tank, and a sixth switching valve is installed on the reflux pipe.

8. The tank oil vapor recovery system of claim 1, wherein: Pressure sensors are installed in the first buffer tank, the pressure tank, and the overpressure buffer tank.

9. The tank oil vapor recovery system of claim 1, wherein: The pressurizing component is an air compressor.

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