Gas phase sampling detection system of oil gas storage tank

Abstract

The invention relates to the technical field of oil gas storage tank safety protection, in particular to an oil gas storage tank gas phase sampling detection system which comprises a storage tank, a floating disc arranged in the storage tank, a sampler and a nitrogen injection mechanism, the sampler and the nitrogen injection mechanism are arranged outside the storage tank, and a sampling opening is formed in one side of the top of the storage tank; the sampler comprises a three-way device, a detector and a first sucking pump, the detector is used for sampling and detecting the concentration of combustible gas in the storage tank in real time after the floating disc falls to the bottom, and the nitrogen injection mechanism comprises a nitrogen supply tank and a nitrogen injection pipe connected with the nitrogen supply tank. The gas-phase sampling detection system for the oil-gas storage tank can accurately detect the concentration of combustible gas in the storage tank in real time after the floating disc falls to the bottom, the actual state of the combustible gas in the storage tank can be detected in real time after the floating disc falls to the bottom, corresponding safety measures can be taken in time according to the detection result, and potential safety hazards caused after trade settlement of the storage tank floating disc falls to the bottom are avoided; the safety risk of floating disc bottom falling is effectively controlled, and safe operation of the storage tank is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas storage tank safety protection, in particular to an oil and gas storage tank gas phase sampling detection system. BACKGROUND

[0002] There are 16 inner floating roof storage tanks in Shouguang Port, the floating plate is an aluminum assembled floating bucket type floating plate, and the main function is to provide customers with finished oil storage services. As a storage tank for trade settlement, the floating plate must be bottomed to meet customer requirements. However, after the floating plate is bottomed, the combustible gas in the storage tank mixes with air to form explosive mixed gas, which poses a great safety hazard. If the concentration of combustible gas in the storage tank can be sampled and detected in real time after the floating plate is bottomed, and appropriate safety measures are taken according to the detection results, the safety risk of the bottomed floating plate can be effectively controlled, and the safe operation of the storage tank can be ensured. SUMMARY

[0003] The purpose of the present application is to provide an oil and gas storage tank gas phase sampling detection system to solve the risk control of the bottomed floating plate and master the actual situation of the internal safety hazard after the floating plate is bottomed.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: an oil and gas storage tank gas phase sampling detection system, comprising a storage tank, a floating plate arranged in the storage tank, a sampler arranged outside the storage tank, and a nitrogen injection mechanism, a sampling port is arranged on one side of the top of the storage tank; the sampler comprises a tee device, a detector, and a first air pump, the tee device is provided with a first port, a second port, and a third port, the first port is connected to the sampling port of the storage tank, the second port and the third port are respectively provided with the detector and the first air pump, the detector is used for sampling and detecting the concentration of combustible gas in the storage tank in real time after the floating plate is bottomed, and the first air pump is used for extracting the combustible gas in the storage tank for detection by the detector; the nitrogen injection mechanism comprises a nitrogen supply tank and a nitrogen injection pipe connected to the nitrogen supply tank, one end of the nitrogen injection pipe extends into the inside bottom of the storage tank close to the floating plate, and the nitrogen injection pipe is used for injecting nitrogen into the storage tank at a constant flow rate after the floating plate is bottomed, so as to form a nitrogen isolation layer between the floating plate and the liquid surface.

[0005] On the basis of the above technical scheme, the present application can also be improved as follows: As a further improvement of the above technical scheme, the tee device comprises a sampling cavity, the first air pump extracts the combustible gas in the storage tank to the sampling cavity for detection by the detector, the first port, the second port, and the third port are in communication with the sampling cavity, the first port is located on one side of the sampling cavity, and the second port and the third port are located on the other side of the tee device.

[0006] As a further improvement of the above technical scheme, the sampling port of the storage tank is used as a support pipe of the sampler, the sampling port of the storage tank and the first port on the tee device are fixed by a flange, and the nitrogen injection pipe penetrates and is fixed on the flange.

[0007] As a further improvement of the above technical solution, the bottom of the storage tank is provided with a nitrogen injection inlet, one end of the nitrogen injection pipe extends into the inside bottom of the storage tank near the floating plate through the nitrogen injection inlet, and a pneumatic valve is arranged on the nitrogen injection pipe.

[0008] As a further improvement of the above technical solution, the oil and gas storage tank gas phase sampling detection system further comprises a first controller and a man-machine control display screen, the detector, the pneumatic valve, the first air pump and the man-machine control display screen are electrically connected with the first controller, the first air pump is controlled by the first controller to extract the combustible gas in the inside of the storage tank for the detector to detect, the pneumatic valve is controlled by the first controller to inject nitrogen into the inside of the storage tank through the nitrogen injection pipe, and the detection result is transmitted to the man-machine control display screen for display by the first controller.

[0009] As a further improvement of the above technical solution, the oil and gas storage tank gas phase sampling detection system further comprises an audible and visual alarm, the audible and visual alarm is electrically connected with the first controller, and the audible and visual alarm generates an alarm by the first controller.

[0010] As a further improvement of the above technical solution, the storage tank is communicated with a gas treatment mechanism through an air extraction pipeline, the gas treatment mechanism comprises a waste gas treatment device, an oil gas recovery device and a control device, the waste gas treatment device and the oil gas recovery device are communicated through a pipeline, one end of the air extraction pipeline is communicated with the inside of the storage tank, the other end of the air extraction pipeline is communicated with the waste gas treatment device, a second air pump and a first electromagnetic valve are sequentially arranged on the air extraction pipeline, the control device comprises a power cabinet and a second controller arranged in the power cabinet, the second air pump and the first electromagnetic valve are electrically connected with the second controller, and the second air pump is used to extract the gas in the storage tank to the waste gas treatment device.

[0011] As a further improvement of the above technical solution, the outlet of the first air pump is communicated with the air extraction pipeline through a gas discharge pipeline, a second electromagnetic valve is arranged on the gas discharge pipeline, the second electromagnetic valve is electrically connected with the first controller, and the first controller is electrically connected with the second controller through a wire.

[0012] As a further improvement of the above technical solution, a plurality of sampling ports can be arranged on the top of the storage tank, the plurality of sampling ports are connected with a plurality of samplers correspondingly, so that multi-point sampling of the combustible gas in the inside of the storage tank at the same position is realized.

[0013] As a further improvement of the above technical solution, a pressure transmitter is arranged between the sampling port of the storage tank and the first port of the tee device.

[0014] The oil and gas storage tank gas phase sampling detection system provided by the present application can accurately detect the combustible gas concentration in the tank after the floating plate falls to the bottom in real time, realize real-time detection of the actual state of the combustible gas in the tank after the floating plate falls to the bottom, so as to take corresponding safety measures in time according to the detection results, avoid the safety hidden danger of the floating plate of the trade settlement tank after falling to the bottom, effectively control the safety risk of the floating plate falling to the bottom, and guarantee the safe operation of the tank. BRIEF DESCRIPTION OF DRAWINGS

[0015] The present application will be further described below in combination with the drawings and examples.

[0016] Figure 1 is a structural schematic diagram of the oil and gas storage tank gas phase sampling detection system provided by the present application embodiment one; Figure 2 is a structural schematic diagram of the oil and gas storage tank gas phase sampling detection system provided by the present application embodiment two; In the figure: 1, tank; 10, sampling port; 11, tank body; 12, top head; 13, flange; 2, floating plate; 31, three-way device; 310, sampling cavity; 311, first port; 312, second port; 313, third port; 32, detector; 33, first air pump; 4, nitrogen injection mechanism; 41, nitrogen supply tank; 42, nitrogen injection pipe; 43, pneumatic valve; 5, first controller; 6, man-machine control display screen; 71, waste gas treatment device; 72, oil gas recovery device; 73, second air pump; 74, air suction pipeline; 75, first electromagnetic valve; 761, power cabinet; 762, second controller; 77, gas discharge pipeline; 78, second electromagnetic valve. DETAILED DESCRIPTION

[0017] The present application will be further described below in combination with the drawings and examples. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the present application in a schematic manner, so that only the components related to the present application are shown.

[0018] In the description of the present application, it is to be understood by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" and the like can be explicitly or implicitly included one or more. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0019] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. Embodiment

[0020] As Figure 1 shown, the oil and gas storage tank gas sampling detection system provided by the embodiment of the present application comprises a storage tank 1, a floating plate 2 arranged in the storage tank 1, a sampler and a nitrogen injection mechanism 4 arranged outside the storage tank 1, and a sampling port 10 is arranged on one side of the top of the storage tank 1; the sampler comprises a tee device 31, a detector 32 and a first air pump 33, the tee device 31 is provided with a first port 311, a second port 312 and a third port 313, the first port 311 is connected with the sampling port 10 of the storage tank 1, the second port 312 and the third port 313 are respectively provided with the detector 32 and the first air pump 33, the detector 32 is used for sampling and detecting the combustible gas concentration in the storage tank 1 in real time after the floating plate 2 falls to the bottom, and the first air pump 33 is used for extracting the combustible gas in the storage tank 1 for the detector 32 to detect; the nitrogen injection mechanism 4 comprises a nitrogen supply tank 41 and a nitrogen injection pipe 42 connected with the nitrogen supply tank 41, one end of the nitrogen injection pipe 42 extends into the inside bottom of the storage tank 1 close to the floating plate 2, and the nitrogen injection pipe 42 is used for injecting nitrogen into the inside of the storage tank 1 at a constant flow rate after the floating plate 2 falls to the bottom, so as to form a nitrogen isolation layer between the floating plate 2 and the liquid surface.

[0021] The volatile petroleum products such as crude oil, gasoline or diesel are stored in the storage tank 1, and the gas space above the oil surface of the storage tank 1 contains combustible gas. The storage tank 1 comprises a tank body 11 and an oval top head 12, and the floating plate 2 is arranged on the inner bottom of the tank body 11.

[0022] The tee device 31 comprises a sampling cavity 310, and the combustible gas in the storage tank 1 is drawn to the sampling cavity 310 by the first air pump 33 for detection by the detector 32. The first port 311, the second port 312 and the third port 313 are in communication with the sampling cavity 310, the first port 311 is located on one side of the sampling cavity 310, and the second port 312 and the third port 313 are located on the other side of the tee device 31.

[0023] Specifically, the sampling port 10 of the storage tank 1 is used as a support pipe of the sampler, a pressure transmitter can be arranged between the sampling port 10 of the storage tank 1 and the first port 311 of the tee device 31, the sampling port 10 of the storage tank 1 is fixed to the first port 311 of the tee device 31 through the flange 13, and the nitrogen injection pipe 42 penetrates and is fixed to the flange 13. The nitrogen injection pipe 42 is arranged on the bottom of the storage tank 1, one end of the nitrogen injection pipe 42 extends into the inside of the storage tank 1 and is close to the floating plate 2, and the pneumatic valve 43 is arranged on the nitrogen injection pipe 42.

[0024] Preferably, a plurality of sampling ports 10 can be arranged on the top of the storage tank 1, and the plurality of sampling ports 10 are connected to a plurality of samplers, so that the combustible gas in the storage tank 1 is sampled at multiple points at the same position, and accurate sample data is provided for the concentration detection of the combustible gas.

[0025] Preferably, the oil and gas storage tank gas phase sampling and detection system further comprises a first controller 5 and a man-machine control display screen 6, the detector 32, the pneumatic valve 43, the first air pump 33 and the man-machine control display screen 6 are electrically connected to the first controller 5, the combustible gas in the storage tank 1 is drawn by the first air pump 33 for detection by the detector 32 under the control of the first controller 5, the pneumatic valve 43 is opened to inject nitrogen into the storage tank 1 through the nitrogen injection pipe 42 under the control of the first controller 5, and the detection result is transmitted to the man-machine control display screen 6 for display under the control of the first controller 5. The first air pump 33 is a diaphragm pump, and the first controller 5 is a PLC controller.

[0026] Preferably, the oil and gas storage tank gas phase sampling and detection system further comprises an audible and visual alarm, and the audible and visual alarm is electrically connected to the first controller 5. If the detected value of the combustible gas is greater than the set value, there is a greater safety hazard, and the audible and visual alarm is triggered by the first controller 5. Embodiment

[0027] As Figure 2As shown, the oil and gas storage tank gas phase sampling detection system provided by the second embodiment of the present application comprises a storage tank 1, a floating plate 2 arranged in the storage tank 1, a sampler and a nitrogen injection mechanism 4 arranged outside the storage tank 1, and a sampling port 10 arranged at one side of the top of the storage tank 1; the sampler comprises a tee device 31, a detector 32 and a first air pump 33; the tee device 31 is provided with a first port 311, a second port 312 and a third port 313; the first port 311 is connected to the sampling port 10 of the storage tank 1; the second port 312 and the third port 313 are respectively provided with the detector 32 and the first air pump 33; the detector 32 is used for sampling and detecting the combustible gas concentration in the storage tank 1 in real time after the floating plate 2 falls to the bottom; and the first air pump 33 is used for extracting the combustible gas in the storage tank 1 for detection by the detector 32; the nitrogen injection mechanism 4 comprises a nitrogen supply tank 41 and a nitrogen injection pipe 42 connected to the nitrogen supply tank 41; one end of the nitrogen injection pipe 42 extends into the inside bottom of the storage tank 1 close to the floating plate 2; and the nitrogen injection pipe 42 is used for injecting nitrogen into the inside of the storage tank 1 at a constant flow rate after the floating plate 2 falls to the bottom, so as to form a nitrogen isolation layer between the floating plate 2 and the liquid surface.

[0028] On the basis of the above-mentioned first embodiment, the storage tank 1 is communicated with a gas treatment mechanism through an air extraction pipeline 74; the gas treatment mechanism comprises a waste gas treatment device 71, an oil gas recovery device 72 and a control device; the waste gas treatment device 71 and the oil gas recovery device 72 are communicated through a pipeline; one end of the air extraction pipeline 74 is communicated with the inside of the storage tank 1; the other end of the air extraction pipeline 74 is communicated with the waste gas treatment device 71; a second air pump 73 and a first electromagnetic valve 75 are sequentially arranged on the air extraction pipeline 74; the control device comprises a power cabinet 761 and a second controller 762 arranged in the power cabinet 761; the second air pump 73 and the first electromagnetic valve 75 are electrically connected with the second controller 762; and the second air pump 73 is used for extracting the gas in the storage tank 1 to the waste gas treatment device 71.

[0029] Further, the outlet of the first air pump 33 is communicated with the air extraction pipeline 74 through a gas discharge pipeline 77; the second electromagnetic valve 78 is arranged on the gas discharge pipeline 77; the second electromagnetic valve 78 is electrically connected with the first controller 5; and the first controller 5 and the second controller 762 are electrically connected through wires.

[0030] Further, the waste gas treatment device 71 comprises a dry vacuum pump and an activated carbon adsorption tank; the inlet end of the dry vacuum pump is communicated with the air extraction pipeline 74 and the gas discharge pipeline 77 through a tee; and the outlet end of the dry vacuum pump is communicated with the activated carbon adsorption tank.

[0031] Further, the oil gas recovery device 72 comprises an oil gas vacuum pump and an oil gas absorption tower; the inlet end of the oil gas vacuum pump is communicated with the outlet of the activated carbon adsorption tank through a pipeline; and the outlet end of the oil gas vacuum pump is communicated with the oil gas absorption tower.

[0032] The oil and gas storage tank gas phase sampling detection system of the present application uses the floating plate 2 in the tank 1 to move up and down according to the capacity of the oil product in the tank 1, which directly affects the accuracy of gas sampling, so before gas sampling, open the pneumatic valve 43 on the nitrogen injection pipe 42, and the nitrogen injection pipe 42 injects nitrogen into the tank 1 at a constant flow rate after the floating plate 2 falls to the bottom, forming a nitrogen isolation layer between the floating plate 2 and the liquid surface, and isolating the floating plate 2 from the liquid surface. Then the first air pump 33 extracts the combustible gas in the tank 1 to the sampling chamber 310 for detection by the detector 32, and the detector 32 detects the combustible gas concentration in the sampling chamber 310 in real time after the floating plate 2 falls to the bottom.

[0033] The present application is applied to the QV104 tank of the Shouguang Longhai Oil Product Storage Co., Ltd., which can accurately detect the combustible gas concentration in the tank 1 after the floating plate 2 falls to the bottom in real time, and realize real-time detection of the actual state of the combustible gas in the tank 1 after the floating plate 2 falls to the bottom, so as to take appropriate safety measures in time according to the detection results, avoid the safety hazards of the tank 1 after the floating plate 2 falls to the bottom, effectively control the safety risks of the floating plate 2 falling to the bottom, and ensure the safe operation of the tank 1.

[0034] The direct economic benefit of the present application is to realize the real-time detection of the combustible gas in the tank 1, achieve the purpose of risk control, and replace the oil and gas recovery device. At present, if the oil and gas recovery device meets the 110,000 cubic meter storage capacity of the Shouguang Port storage area, at least 20 million yuan is invested, which is equivalent to 1.25 million yuan for one tank. At present, the cost of modifying one tank by installing the above oil and gas storage tank gas phase sampling detection system is 100,000 yuan, and the direct economic benefit of one tank is 1.15 million yuan.

[0035] The above specific embodiments of the present application are not involved in the description of the known technology in the art, which can be implemented by referring to the known technology.

[0036] The above ideal embodiments of the present application are inspired by the above description, and related personnel can make various changes and modifications without deviating from the scope of the present application. The technical scope of the present application is not limited to the contents of the specification, and must be determined by the scope of the claims.

Claims

1. A vapor phase sampling and detection system for oil and gas storage tanks, comprising: The oil and gas storage tank gas phase sampling detection system comprises a storage tank, a floating disc arranged in the storage tank, a sampler and a nitrogen injection mechanism arranged outside the storage tank, and a sampling port is arranged at one side of the top of the storage tank; the sampler comprises a tee device, a detector and a first air pump, the tee device is provided with a first port, a second port and a third port, the first port is connected with the sampling port of the storage tank, the second port and the third port are respectively provided with the detector and the first air pump, the detector is used for sampling and detecting the combustible gas concentration in the storage tank in real time after the floating disc falls to the bottom, and the first air pump is used for extracting the combustible gas in the storage tank to the detector for detection; the nitrogen injection mechanism comprises a nitrogen supply tank and a nitrogen injection pipe connected with the nitrogen supply tank, one end of the nitrogen injection pipe extends into the inside bottom of the storage tank and is close to the floating disc, and the nitrogen injection pipe is used for injecting nitrogen into the inside of the storage tank at a constant flow rate after the floating disc falls to the bottom, so as to form a nitrogen isolation layer between the floating disc and the liquid surface.

2. The vapor phase sampling detection system for oil and gas storage tanks of claim 1, wherein: The tee device comprises a sampling cavity, the first air pump extracts the combustible gas in the storage tank to the sampling cavity for detection by the detector, and the first port, the second port and the third port are communicated with the sampling cavity, the first port is located at one side of the sampling cavity, and the second port and the third port are located at the other side of the tee device.

3. The vapor phase sampling detection system for oil and gas storage tanks of claim 2, wherein: The sampling port of the storage tank is used as a support pipe of the sampler, the sampling port of the storage tank and the first port on the tee device are fixed through a flange, and the nitrogen injection pipe penetrates through and is fixed on the flange.

4. The vapor phase sampling detection system for oil and gas storage tanks of claim 3, wherein: The bottom of the storage tank is provided with a nitrogen injection port, one end of the nitrogen injection pipe extends into the inside bottom of the storage tank and is close to the floating disc through the nitrogen injection port, and a pneumatic valve is arranged on the nitrogen injection pipe.

5. The vapor phase sampling detection system for oil and gas storage tanks of claim 4, wherein: The oil and gas storage tank gas phase sampling detection system further comprises a first controller and a man-machine control display screen, the detector, the pneumatic valve, the first air pump and the man-machine control display screen are electrically connected with the first controller, the combustible gas in the storage tank is extracted by the first air pump to the detector for detection under the control of the first controller, the pneumatic valve is opened to inject nitrogen into the storage tank through the nitrogen injection pipe under the control of the first controller, and the detection result is transmitted to the man-machine control display screen for display through the first controller.

6. The vapor phase sampling detection system for oil and gas storage tanks of claim 5, wherein: The oil and gas storage tank gas phase sampling detection system further comprises an audible and visual alarm, the audible and visual alarm is electrically connected with the first controller, and the first controller generates an alarm through the audible and visual alarm.

7. The vapor phase sampling detection system for oil and gas storage tanks of claim 5, wherein: The storage tank is communicated with a gas treatment mechanism through an air extraction pipeline, the gas treatment mechanism comprises a waste gas treatment device, an oil gas recovery device and a control device, the waste gas treatment device and the oil gas recovery device are communicated through a pipeline, one end of the air extraction pipeline is communicated with the inside of the storage tank, the other end of the air extraction pipeline is communicated with the waste gas treatment device, a second air pump and a first electromagnetic valve are sequentially arranged on the air extraction pipeline, the control device comprises a power cabinet and a second controller arranged in the power cabinet, the second air pump and the first electromagnetic valve are electrically connected with the second controller, and the second air pump is used for extracting the gas in the storage tank to the waste gas treatment device.

8. The vapor phase sampling detection system for oil and gas storage tanks of claim 7, wherein: The outlet of the first air pump is communicated with the air extraction pipeline through a gas discharge pipeline, the second electromagnetic valve is arranged on the gas discharge pipeline, the second electromagnetic valve is electrically connected with the first controller, and the first controller and the second controller are electrically connected through wires.

9. The vapor phase sampling detection system for oil and gas storage tanks of claim 1, wherein: The top of the storage tank can be provided with a plurality of sampling ports corresponding to a plurality of samplers to sample combustible gas in the same position of the storage tank.

10. The vapor phase sampling detection system for oil and gas storage tanks of claim 1, wherein: A pressure transmitter is arranged between the sampling port of the storage tank and the first port of the tee device.

Images