Tank body automatic air exhaust system and tank field intelligent management system

Abstract

The utility model discloses a tank body automatic air exhaust system and a tank field intelligent management system, relates to the field of general control and regulation systems, and is mainly characterized in that sensors such as a temperature transmitter, a pressure transmitter and a flowmeter are arranged in the tank field intelligent management system to monitor an oil storage tank in real time. Meanwhile, a tank body automatic air exhaust system is further arranged and specifically comprises an oil storage tank used for storing oil and an oil-gas mixture; the compressor is used for pumping oil-gas mixture out of the oil storage tank; the cooler is used for cooling the oil-gas mixture; the separator is arranged on the pipeline on the rear side of the cooler and is used for separating oil and gas in the oil-gas mixture; and the gas supply pipeline is used for returning the separated gas to the oil storage tank. A flammable and explosive normal-pressure closed tank pressure balance adjusting system with an automatic gas supply function is arranged for automatically extracting gas from a large tank to recover oil gas volatilized from an oil storage tank, so that oil gas loss is reduced, pollution is reduced, and micro-positive-pressure totally-closed intrinsic safety operation of the whole tank area is realized.

Description

Technical Field

[0001] The utility model relates to the field of general control and regulation systems, and particularly to an automatic air extraction system for a tank body and an intelligent management system for a tank farm. Background Technique

[0002] Fixed roof storage tanks in oilfield production areas are a common type of oil storage tank, which usually consists of a tank body and a fixed roof. Fixed roof storage tanks are a type of oil storage tank suitable for storing crude oil and petroleum products in oilfield production areas, with advantages such as simple structure, good sealing performance, and convenient maintenance. At the same time, attention also needs to be paid to the safety management and maintenance of oil storage tanks, establishing a perfect safety management system and emergency plan to ensure the safe operation of oil storage tanks and the safe storage of petroleum products. The following are some characteristics of fixed roof storage tanks:

[0003] Simple structure: The structure of the fixed roof storage tank is relatively simple, easy to manufacture, and has a low cost.

[0004] Good sealing performance: The top of the fixed roof storage tank is fixed on the tank wall, with good sealing performance, which can effectively prevent oil volatilization and evaporation.

[0005] Suitable for storing oils with low volatility: Due to the good sealing performance of the fixed roof storage tank, it is suitable for storing oils with low volatility, such as crude oil, fuel oil, etc.

[0006] Large floor area: The fixed roof storage tank has a large floor area and requires more space, which is not very suitable for areas with tight land resources.

[0007] Convenient maintenance: The fixed roof storage tank is convenient for maintenance and easy to overhaul, which can effectively extend the service life of the storage tank.

[0008] Currently, with the development and popularization of intelligent technologies, more and more industries and fields are beginning to adopt intelligent management technologies to improve production efficiency and management level. As an important facility in the oilfield production process, oil storage tanks are also facing the needs and challenges of intelligent management.

[0009] Necessity for the intelligentization of oil storage tanks: Complexity of management: It involves multiple aspects, including the types of oils, oil storage capacity, liquid level height in the tank, water level height in the tank, water content in the liquid in the tank, oil storage temperature, oil storage pressure, safety accessories, etc. The management and monitoring are difficult, and intelligent technical means need to be adopted for management and monitoring.

[0010] The need for safety management: The crude oil in the oil storage tank has a relatively high oil and gas content and a large gas content in the oil. After the oil and gas are separated, there is still a lot of natural gas dissolved in the crude oil, resulting in serious oil and gas loss in the oil storage tank. Once a leakage or explosion occurs, it will cause serious environmental pollution and casualties. Therefore, it is necessary to adopt an intelligent safety monitoring and management system to ensure the safe operation of the oil storage tank.

[0011] The need for digital transformation: With the acceleration of digital transformation, digital management of oil storage tanks has also become a trend. The use of intelligent technology to realize digital monitoring and management of oil storage tanks can improve management efficiency and management level and reduce the impact of human factors on oil storage tank management.

[0012] To sum up, the installation of intelligent management technology is an inevitable trend in oil storage tank management. Intelligent technology can realize real-time monitoring, remote management, automatic control and other functions of oil storage tanks, improve the safety and management level of oil storage tanks, and reduce accident risks and losses. Utility Model Content

[0013] The purpose of the utility model is to provide an automatic gas extraction system for a tank body and an intelligent management system for a tank area, so as to solve the problems raised in the above-mentioned background technology.

[0014] In order to solve the above technical problems, the utility model provides the following technical solutions: an automatic air extraction system for a tank, comprising:

[0015] Oil storage tanks, used to store oil and oil-gas mixtures;

[0016] A compressor, placed on top of the oil storage tank, is used to pump the oil-gas mixture out of the oil storage tank;

[0017] A cooler, used to cool the oil-gas mixture;

[0018] The separator is placed on the pipeline at the rear side of the cooler and is used to separate the oil and gas in the oil-gas mixture;

[0019] The gas supply pipeline is used to return the separated gas to the oil storage tank.

[0020] Preferably, it also includes a sewage storage tank for storing the separated liquid.

[0021] Preferably, an inlet separator is further provided on the front side of the compressor, the natural gas outlet of the inlet separator is connected to the compressor, and the liquid pipeline of the inlet separator is connected to the sewage storage tank.

[0022] Preferably, a one-way valve is also installed on the air supply pipeline.

[0023] Preferably, the oil storage tank is also provided with a water pipe and an oil pipe.

[0024] Preferably, cut-off valves and regulating valves are installed on both the water pipe and the oil pipe.

[0025] Preferably, an adjusting cylinder is also installed on the pipeline on the outlet side of the check valve, and the adjusting cylinder is used to increase the speed and pressure of the gas returning to the storage oil tank.

[0026] Preferably, the adjusting cylinder includes: a cylinder body, a piston plate is slidably installed inside the cylinder body, and the piston plate divides the cylinder body into upper and lower chambers;

[0027] A driving component is fixedly installed on the top of the cylinder body, and the driving component is connected to the piston plate and is used to drive the piston plate to slide up and down inside the cylinder body;

[0028] An intake pipe, which is communicated with the outlet of the check valve, and an air inlet communicated with the upper and lower chambers of the cylinder body is installed on the intake pipe;

[0029] An outlet pipe is also installed on the cylinder body, and the outlet pipe is communicated with the storage oil tank, and an air outlet communicated with the upper and lower chambers of the cylinder body is installed on the outlet pipe;

[0030] Sealing components are installed at both the air inlet and the air outlet, and the sealing components are used to control the opening and closing of the air outlet and the air inlet.

[0031] An intelligent management system for a tank farm includes the above-mentioned automatic air extraction system for the tank body.

[0032] Preferably, it also includes a temperature transmitter, a pressure transmitter, and a flowmeter placed in the storage oil tank for real-time monitoring of the storage oil tank.

[0033] Compared with the prior art, the beneficial effects of the present utility model are:

[0034] The present utility model recovers the oil and gas volatilized from the storage oil tank by automatically extracting air from the large tank through an intrinsically safe operation of the pressure balance adjustment system for inflammable and explosive atmospheric pressure sealed tanks with an automatic air replenishment function, reduces oil and gas loss, reduces pollution, and realizes "slightly positive pressure" fully enclosed intrinsic safety operation of the entire tank farm. Description of the Drawings

[0035] Figure 1 is a schematic diagram of the present utility model;

[0036] Figure 2 is a structural diagram of the system of the present utility model;

[0037] Figure 3 is a structural diagram of the adjusting cylinder of the present utility model;

[0038] Figure 4 is the present utility model Figure 3 Enlarged view at A in;

[0039] Figure 5 is a structural diagram of the intake pipe and the sealing component of the present utility model;

[0040] Figure 6 is a structural diagram of the sealing component of the present utility model;

[0041] Figure 7 is a structural diagram of the upper chamber intake of the present utility model;

[0042] Figure 8 is a structural diagram of the lower chamber intake of the present utility model. Specific embodiments

[0043] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0044] As Figure 1-2 shown in, this embodiment provides an intelligent management system for a tank farm. The system is composed of three parts: a collection layer, a control layer, and a management layer, and can complete the operation and management of the entire production business process of the tank farm. It includes various operations such as liquid inlet and outlet, inventory tracking, status detection of the entire tank farm, inventory calculation, volume and mass measurement information collection, water cutting, floating oil removal, sludge and sand removal, large tank air extraction, tank cleaning, etc., and records are completed.

[0045] Various instruments and meters are installed inside the storage tank, such as (such as interface meters, flow meters, temperature transmitters, pressure transmitters, etc.) to monitor the tank farm in real time to ensure the safe operation of the tank farm. At the same time, a water level sensor, an oil thickness sensor, an emulsion layer sensor, a comprehensive water content sensor, a temperature sensor, an oil and gas volatilization sensor, and an oil spill sensor are installed in the tank. The setting methods and control principles of the above various instruments and meters and sensors refer to the Chinese patent with the publication number CN117872914A, an intrinsically safe intelligent management system for a tank farm. The above instruments detect all state production parameters such as the liquid level, water level, oil thickness, emulsion layer, comprehensive water content, temperature, etc. in the tank, and can replace manual tank measurement. At the same time, the storage tank is equipped with automated control equipment, such as: an electric control valve and an emergency cut-off valve are installed at the oil outlet, an outlet pressure transmitter and an outlet temperature transmitter, and if there is a sewage outlet, an electric control valve and an emergency cut-off valve, an outlet pressure transmitter and an outlet temperature transmitter are also installed. An electric control valve and an emergency cut-off valve, an inlet pressure transmitter and an inlet temperature transmitter are installed at the storage tank inlet, so that a single storage tank can cut off the inlet and outlet pipelines in an emergency, and during normal operation, the flow rate can be adjusted by the control valve at the outlet, and it can communicate with other equipment units (such as other storage tanks, sewage recovery tanks, etc.) and the medium can flow automatically.

[0046] In this embodiment, installing a regulating valve at the oil outlet of the storage tank is a common method for controlling and regulating the flow rate. The regulating valve is generally installed on the oil outlet or water outlet pipeline of the storage tank, and the flow rate and pressure of the medium are controlled by adjusting the opening of the valve. At the same time, pressure and temperature detection are configured to monitor the medium condition and pipeline condition of the outlet pipeline in real time.

[0047] An automatic tank gas extraction system is also set up in the tank farm intelligent management system, such as Figure 1-2 shown, including

[0048] A storage tank for storing petroleum and oil-gas mixtures;

[0049] A compressor placed inside the storage tank for extracting the oil-gas mixture from the storage tank;

[0050] A cooler for cooling the oil-gas mixture;

[0051] A separator placed on the pipeline behind the cooler for separating the oil and gas in the oil-gas mixture;

[0052] An air supply pipeline for returning the separated gas to the storage tank; a check valve is also set on the air supply pipeline so that the gas can flow into the storage tank without backflow.

[0053] A sewage storage tank for storing the separated liquid.

[0054] The storage tank, compressor, cooler, separator and sewage storage tank are connected by gas transmission pipelines.

[0055] Such as Figure 1 and Figure 2 shown, the gas transmission pipeline is located at the top of the storage tank and is connected with an inlet separator. The natural gas outlet of the inlet separator is connected with the compressor, and the liquid outlet of the inlet separation is connected with the sewage storage tank. The outlet of the compressor is connected with an outlet separator. The natural gas outlet of the outlet separator is connected with the external transmission network of natural gas, and the natural gas outlet of the outlet separator is also connected with the air supply pipeline. The other end of the air supply pipeline is connected with the storage tank, and the liquid outlet of the outlet separation is connected with the sewage storage tank.

[0056] The specific process of natural gas extraction is as follows: such as Figure 1As shown in the figure, the volatile gas in the storage tank is transported to the compressor skid site through the incoming gas pipeline. First, it undergoes precooling and separation to separate the liquid (mainly light oil and condensate water) in the volatile gas of the storage tank. The gas then enters the compressor, where it is compressed to provide the transportation power and is input into the natural gas system of the combined station. The separated liquid is discharged into the sewage storage tank through the sewage pump. After being compressed, the gas is cooled down and then enters the outlet separator again. The gas after gas-liquid separation enters the natural gas system within the station, and the liquid is discharged to the liquid sewage storage tank through pipelines or pumps. The automatic air extraction system of the tank extracts the oil-gas mixture in the storage tank through the compressor. After cooling and separation, the oil is stored, and at the same time, the gas is returned to the storage tank. This process utilizes the pressure difference between the gas and the liquid. When the gas is extracted, the pressure in the storage tank will decrease, thereby promoting the flow of the oil-gas mixture. The large tank automatic air extraction is carried out through the pressure balance adjustment system of the inflammable and explosive atmospheric pressure closed tank with automatic air replenishment function to recover the oil gas volatilized from the storage tank, reduce the oil gas loss, lower the pollution, and achieve the intrinsically safe operation of the entire tank farm with "slightly positive pressure" and full enclosure.

[0057] As Figure 2 shown, equipment such as multi-parameter multi-channel monitoring instruments installed on the storage tank, temperature transmitters, pressure transmitters, cut-off valves, and regulating valves installed on the inlet and outlet pipelines of the storage tank are connected through signal lines, and the signals are led to the PLC control system in the power distribution room or the duty room. The control unit of the large tank automatic air extraction system also leads the signals to the PLC control system in the power distribution room or the duty room through signal lines. The PLC control system uses local area networks (such as computer local area networks, GPRS, 4G, ZigBee, LoRa, NB-IoT, etc.) to upload the calculated data and control points to the monitoring computer (operator station), and finally realizes functions such as data monitoring and remote control by the operator at the operator station.

[0058] The intelligent management system of the tank farm based on intrinsic safety realizes the intelligent management and intrinsic safety management of the tank farm through technical means such as monitoring instruments, data transmission, intelligent analysis, remote monitoring, and emergency management, improving the management efficiency and safety, and reducing the accident risk and losses.

[0059] In this embodiment, through the automation control technology, according to the status of the storage tank and the process requirements, the input and output of media such as incoming liquid or crude oil, sewage, and natural gas are automatically controlled. For example, corresponding control parameters are set on the monitoring computer, control instructions are issued through system operation, the bottom water is automatically pumped according to the water level, the floating oil is automatically removed according to the liquid level and oil thickness, the sludge and sand are automatically discharged, and the large tank automatic air extraction is carried out according to the pressure balance in the tank, etc., to realize the intelligent full automation control of the production process in the tank farm.

[0060] When air is supplemented to the storage oil tank, the speed of air supplementation is related to the pressure of the storage oil tank and the air flow in the air supplementation pipeline, and the air flow is related to the compressor of the entire system. The compressor provides air flow power and pressure for both the external transmission pipeline network and the air supplementation pipeline at the same time. Since a relatively large pressure is required when the external transmission pipeline network transports gas, the pressure provided to the air supplementation pipeline is relatively small. In order to better control the speed and pressure of the air supplementation pipeline entering the storage oil tank, in this application, an adjustment cylinder is also installed on the pipeline on the outlet side of the one-way valve, as shown in Figure 2 shown. The adjustment cylinder can increase the flow rate and speed of the liquid entering the interior of the storage oil tank.

[0061] As shown in Figures 3-6 shown, the adjustment cylinder includes a cylinder body 1. The cylinder body 1 is of a cylindrical structure. A piston plate 5 is slidably installed inside the cylinder body 1, and the piston plate 5 is in contact with the inner side wall of the cylinder body 1; the piston plate 5 divides the cylinder body 1 into upper and lower chambers;

[0062] A pneumatic cylinder or a hydraulic rod is also fixedly installed on the top of the cylinder body 1. The moving end of the pneumatic cylinder or the hydraulic cylinder penetrates into the interior of the cylinder body 1 and is fixedly connected to the upper surface of the piston plate 5, serving as a driving member 3 of the piston plate 5 for driving the piston plate 5 to slide up and down inside the cylinder body 1.

[0063] An air inlet pipe 2 is also fixedly installed on the cylinder body 1. The air inlet pipe 2 is communicated with the outlet of the one-way valve. An air inlet communicating with the upper and lower chambers of the cylinder body 1 is installed on the air inlet pipe 2. An air outlet pipe 4 is also installed on the cylinder body 1. The air outlet pipe 4 is communicated with the storage oil tank. An air outlet communicating with the upper and lower chambers of the cylinder body 1 is installed on the air outlet pipe 4. In this embodiment, the air inlet pipe 2 and the air outlet pipe 4 are symmetrically arranged about the center axis of the cylinder body 1.

[0064] Sealing members are installed at both the air inlet and the air outlet. The sealing members are used to control the opening and closing of the air outlet and the air inlet. The sealing members are arranged in the same direction in the air inlet and the air outlet.

[0065] Specifically, as shown in Figure 2 shown, the sealing member includes a support ring 6 and a sealing ring 7. The support ring 6 is of a circular ring structure, and the sealing ring 7 is of a circular plate structure. The support ring 6 is fixedly installed on the inner side walls of the air outlet and the air inlet. An installation ring is fixedly installed on the side of the support ring 6 facing away from the one-way valve. A rotating shaft is fixedly installed on one side of the sealing ring 7. The rotating shaft is rotatably installed in the installation ring, and the sealing ring 7 can rotate upward. In this embodiment, the diameter of the sealing ring 7 is smaller than the diameters of the air inlet and the air outlet and larger than the inner diameter of the support ring 6, so that the sealing ring 7 can rotate in the air inlet or the air outlet.

[0066] As shown in Figure 7 shown, when the piston plate 5 moves downward (as shown in Figure 7As shown by the dashed arrow in the figure, the space in the upper chamber becomes larger, generating negative pressure. The sealing ring 7 of the upper air inlet rotates upward to open, and gas enters the upper chamber from the upper air inlet of the air inlet pipe 2 to supplement air to the upper chamber. The upper air outlet closes under negative pressure. At the same time, the space in the lower chamber becomes smaller, the pressure increases, the sealing ring 7 of the lower air outlet rotates upward, the support ring 6 opens, the lower air outlet exhausts outward, and the gas is discharged from the outlet pipe 4 and enters the storage oil tank to supplement air to the storage oil tank. The lower air inlet is in a closed state under high pressure. The gas movement state is as Figure 7 shown by the solid arrow in the figure.

[0067] As Figure 8 shown, when the piston plate 5 moves upward (as Figure 8 shown by the dashed arrow in the figure), the lower chamber of the cylinder body 1 becomes larger, generating negative pressure. The sealing ring 7 of the lower air inlet rotates upward, the support ring 6 opens, and gas enters the lower chamber from the lower air inlet of the air inlet pipe 2 to supplement air to the lower chamber. The lower air outlet closes under negative pressure. The space in the upper chamber becomes smaller, the internal pressure increases, the sealing ring 7 of the upper air outlet rotates upward, the support ring 6 opens, the upper air outlet exhausts outward, and the gas is discharged from the outlet pipe 4 and enters the storage oil tank to supplement air to the storage oil tank. The upper air inlet is in a closed state under high pressure. The gas movement state is as Figure 8 shown by the solid arrow in the figure.

[0068] During the process of exhausting air from the upper air outlet, the air from the upper air outlet will flow through the lower air outlet. The pressure of the upper air outlet in the outlet pipe 4 is greater than the pressure of the lower chamber, which will generate pressure on the side of the sealing ring 7, making the sealing ring 7 fit more tightly on the support ring 6.

[0069] When the movement speed of the piston plate 5 is greater than the air flow speed of the front-end air supplement pipe, the flow rate of the gas inside the outlet pipe 4 will also be greater than the flow rate of the gas in the air supplement pipe, thereby increasing the flow rate of the gas inside the outlet pipe 4, and correspondingly increasing the gas flow rate entering the storage oil tank from the outlet pipe 4. By continuously moving the piston plate 5 up and down, the storage oil tank can be continuously supplemented with air, and the gas in the air supplement pipe will circulate into the upper chamber and the lower chamber of the cylinder body 1, and the air supplement pipe will not stop supplementing air, and the pressure fluctuation at the air inlet end of the air supplement pipe will not occur.

[0070] When it is not necessary to increase the gas speed and flow rate entering the storage oil tank, it is only necessary to keep the piston plate 5 stationary. The pressure of the air supplement pipe itself will push up the sealing ring 7, making both the air inlet and the air outlet in an open state, and the gas in the air supplement pipe can directly enter the storage oil tank. Since the cylinder body 1 is provided with an upper chamber and a lower chamber, and both have an air inlet and an air outlet, when the piston plate 5 does not move, as long as one of the air inlets and air outlets of the upper chamber or the lower chamber is open, gas circulation can be achieved.

[0071] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An automatic air extraction system for a tank body, characterized in that, Comprising: An oil storage tank for storing petroleum and oil-gas mixtures; A compressor for pumping the oil-gas mixture out of the oil storage tank; A cooler for cooling the oil-gas mixture; A separator placed on the pipeline behind the cooler for separating the oil and gas in the oil-gas mixture; A gas supply pipeline for returning the separated gas back to the oil storage tank.

2. The automatic air extraction system for a tank body according to claim 1, wherein: It further includes a sewage storage tank for storing the separated liquid.

3. The automatic air extraction system for a tank body according to claim 2, characterized in that: An inlet separator is also provided on the front side of the compressor. The natural gas outlet of the inlet separator is connected to the compressor, and the liquid pipeline of the inlet separator is connected to the sewage storage tank.

4. The automatic air extraction system for a tank body according to claim 1, characterized in that: A check valve is also installed on the gas supply pipeline.

5. The automatic air extraction system for a tank body according to claim 1, wherein: Water pipes and oil pipes are also provided on the oil storage tank.

6. The automatic air extraction system for a tank body according to claim 5, wherein: Cut-off valves and regulating valves are installed on both the water pipes and the oil pipes.

7. An automatic air extraction system for a tank body according to claim 4, characterized in that: A regulating cylinder is also installed on the pipeline on the outlet side of the check valve. The regulating cylinder is used to increase the speed and flow rate of the gas returning to the oil storage tank.

8. An automatic air extraction system for a tank body according to claim 7, characterized in that: The regulating cylinder includes: A cylinder body (1), inside which a piston plate (5) is slidably installed. The piston plate (5) divides the cylinder body (1) into upper and lower chambers; A driving component (3) is fixedly installed on the top of the cylinder body (1). The driving component (3) is connected to the piston plate (5) and is used to drive the piston plate (5) to slide up and down inside the cylinder body (1); An inlet pipe (2) is connected to the outlet of the check valve. An air inlet communicating with the upper and lower chambers of the cylinder body (1) is installed on the inlet pipe (2); An outlet pipe (4) is also installed on the cylinder body (1). The outlet pipe (4) is connected to the oil storage tank. An air outlet communicating with the upper and lower chambers of the cylinder body (1) is installed on the outlet pipe (4); Sealing components are installed at both the air inlet and the air outlet. The sealing components are used to control the opening and closing of the air outlet and the air inlet.

9. An intelligent management system for a tank farm, characterized in that: It includes the automatic air extraction system for the tank body according to any one of claims 1-8.

10. The intelligent management system for a tank farm according to claim 9, characterized in that: It further includes a temperature transmitter, a pressure transmitter, and a flow meter placed inside the oil storage tank for real-time monitoring of the oil storage tank.

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