Tank top air seal device

Abstract

The utility model discloses a tank top air sealing device, which relates to the technical field of petroleum storage equipment and comprises a tank body, a first connecting pipeline and a second connecting pipeline. The flange connecting piece is communicated with the output end of the first connecting pipeline, and a first port and a second port are formed in the flange connecting piece; the pressure transmitter module is communicated with the first port of the flange connecting piece, and the pressure transmitter module is used for monitoring the air pressure in the tank body and establishing signal connection with the control unit; the flame arrester breather valve is communicated with the second port of the flange connecting piece; one end of the connecting seat is communicated with the output end of the second connecting pipeline, the other end of the connecting seat is communicated with the flame arrester, the outlet end of the flame arrester is provided with a program control valve, the output end of the program control valve is connected with a flange pipe, the output end of the flange pipe is connected with an oil-gas recovery pipeline, the output end of the oil-gas recovery pipeline is communicated with the recovery tank, and the program control valve is in signal connection with the control unit. The tank top air sealing device ensures that the air pressure in the tank is stable, improves the safety and reduces the environmental pollution.

Description

TECHNICAL FIELD

[0001] The utility model relates to petroleum storage equipment technical field, especially a tank top gas seal device. BACKGROUND

[0002] With the development of social economy and the increasingly strict requirement of environmental protection, the safety and environmental protection of large-scale petroleum storage tanks, as an important part of national energy strategy reserve, have attracted widespread attention. In order to prevent the oil gas in the fixed roof storage tank from being directly discharged to the atmosphere to cause environmental pollution, according to the relevant national standards, the storage tank must be equipped with a closed exhaust system, and the waste gas is guided to an organic waste gas recovery or treatment device to ensure that the discharge meets the environmental regulations.

[0003] At present, the petroleum treatment of the storage tank mainly relies on nitrogen sealing device, large tank air extraction device and catalytic combustion method. These methods realize the recycling and pollution control of oil gas to some extent, but still have some deficiencies. In particular, in terms of safety early warning at the top of the storage tank, the existing system cannot provide sufficient support. Specifically, the existing storage tank usually does not have the ability to monitor the change of internal gas pressure and oxygen concentration in real time, which leads to the inability to timely perceive the safety state in the storage tank, such as overpressure or reaching the explosion critical range, thereby increasing the safety hazard.

[0004] Therefore, how to provide a tank top gas seal device can ensure real-time acquisition of the pressure change in the storage tank, and ensure that the gas environment in the storage tank is in an intrinsically safe state is a technical problem that needs to be solved by the person skilled in the art at present. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a tank top gas seal device, which solves the technical problem that the existing storage tank cannot ensure that the gas environment in the tank is in an intrinsically safe state.

[0006] To achieve the above-mentioned purpose, the utility model provides a tank top gas seal device, which comprises:

[0007] A tank body, the tank body is provided with a first connecting pipeline and a second connecting pipeline;

[0008] A flange connecting piece, which is in communication with the output end of the first connecting pipeline, the flange connecting piece is provided with a first port and a second port;

[0009] A pressure transmitter module, which is in communication with the first port of the flange connecting piece, the pressure transmitter module is used for monitoring the air pressure in the tank body and establishing signal connection with a control unit;

[0010] A flame arrestor breather valve, which is in communication with the second port of the flange connecting piece;

[0011] The connecting seat is in communication with the output end of the second connecting pipeline at one end and in communication with the flame arrester at the other end, the outlet end of the flame arrester is provided with a program-controlled valve, the output end of the program-controlled valve is connected with a flange pipe, the output end of the flange pipe is connected with an oil gas recovery pipeline, the output end of the oil gas recovery pipeline is in communication with a recovery tank, the program-controlled valve is in signal connection with the control unit, when the gas pressure in the tank body rises to the upper limit of the exhalation pressure threshold value, the control unit opens the program-controlled valve, when the gas pressure in the tank body falls to the lower limit of the inhalation pressure threshold value, the control unit closes the program-controlled valve, when the gas pressure in the tank body falls to the lower limit of the inhalation pressure threshold value, the control unit opens the program-controlled valve, and when the gas pressure in the tank body rises to the upper limit of the inhalation pressure threshold value, the control unit closes the program-controlled valve.

[0012] Preferably, the flange connector is further provided with a third port, the third port is in communication with a sampling pipeline at one end, the other end of the sampling pipeline is in communication with an analysis assembly for monitoring the oxygen concentration in the tank body, and the analysis assembly is in signal connection with the control unit.

[0013] Preferably, an alarm module is further included, the alarm module is in signal connection with the control unit, when the gas pressure in the tank body exceeds a preset safety range or the oxygen concentration reaches a preset alarm threshold value, the control unit triggers the alarm module to alarm.

[0014] Preferably, the alarm module includes an audible and visual alarm and / or a remote alarm signal transmitter, the remote alarm signal transmitter is used to send an alarm signal to a remote monitoring center.

[0015] Preferably, the number of pressure transmitter modules is three groups, and each group of pressure transmitter modules is in parallel connection with the first port of the flange connector, each group of pressure transmitter modules includes a pressure transmitter and a switch valve arranged on the pipeline.

[0016] Preferably, a shell connected with the connecting seat is further included, the flame arrester and the program-controlled valve are located in the shell, an explosion-proof control box is further arranged in the shell, and the control unit is arranged in the explosion-proof control box.

[0017] Preferably, the program-controlled valve is an explosion-proof electric valve with an emergency shutdown feature.

[0018] Preferably, the control unit is a PLC.

[0019] With respect to the above background, the tank top gas sealing device provided by the utility model opens the program control valve when the gas pressure in the tank body rises to the upper limit of the exhalation pressure threshold (80% of the exhalation pressure of the flame arrester breather valve), the control unit receives the signal of the pressure transmitter module, the oil gas in the tank body is discharged into the recovery tank through the second connecting pipeline, the connecting seat, the flame arrester, the program control valve, the flange pipe and the oil gas recovery pipeline, closes the program control valve when the gas pressure in the tank body drops to the lower limit of the exhalation pressure threshold (20% of the exhalation pressure of the flame arrester breather valve), opens the program control valve when the gas pressure in the tank body drops to the lower limit of the inhalation pressure threshold (80% of the inhalation pressure of the flame arrester breather valve), the control unit, the oil gas in the recovery tank is sucked into the tank body through the oil gas recovery pipeline, the flange pipe, the program control valve, the flame arrester, the connecting seat and the second connecting pipeline, and closes the program control valve when the gas pressure in the tank body rises to the upper limit of the inhalation pressure threshold (20% of the inhalation pressure of the flame arrester breather valve).

[0020] To sum up, the tank top gas sealing device provided by the application ensures the stability of the gas pressure in the tank, improves the safety and reduces the environmental pollution. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only the embodiments of the utility model, and other drawings can be obtained according to the provided drawings without creative labor for those skilled in the art.

[0022] Fig. 1 The tank top gas sealing device structure schematic view provided by the utility model embodiment;

[0023] Fig. 2 The flame arrester and program control valve assembly schematic view provided by the utility model embodiment.

[0024] Among them:

[0025] 1-tank body, 2-first connecting pipeline, 3-second connecting pipeline, 4-flange connecting piece, 5-flame arrester breather valve, 6-flame arrester, 7-program control valve, 8-oil gas recovery pipeline, 9-sampling pipeline, 10-pressure transmitter, 11-on-off valve, 12-housing, 13-explosion-proof control box. DETAILED DESCRIPTION

[0026] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] In order for those skilled in the art to better understand the technical scheme of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0028] Referring to Figs. 1-2 The present application provides a kind of tank top gas seal device, including tank 1, tank 1 is provided with first connecting pipeline 2 and second connecting pipeline 3;Flange connector 4, with the output end of first connecting pipeline 2 communication, flange connector 4 is provided with first port and second port;Pressure transmitter module, with the first port of flange connector 4 communication, pressure transmitter module is used to monitor the air pressure in tank 1, and with control unit establishes signal connection;Flame arrestor breather valve 5, with the second port of flange connector 4 communication;Connecting seat, one end with the output end of second connecting pipeline 3 communication, the other end with flame arrestor 6 communication, the outlet end of flame arrestor 6 is provided with program-controlled valve 7, the output end of program-controlled valve 7 connects flange pipe, the output end of flange pipe connects oil gas recovery pipeline 8, the output end of oil gas recovery pipeline 8 is communicated recovery tank, program-controlled valve 7 with control unit establishes signal connection.

[0029] Tank 1, for fixed roof storage tank, is used to store petroleum, first connecting pipeline 2 and second connecting pipeline 3 are arranged at the top of tank 1 respectively, and are communicated with tank.

[0030] Flange connector 4 is tightly connected to the output end of first connecting pipeline 2, which has first port and second port.

[0031] Pressure transmitter module is communicated with the first port of flange connector 4, which can accurately and real-timely measure the air pressure in tank, and convert pressure data into electrical signal and transmit to control unit.

[0032] Flame arrestor breather valve 5 is connected with the second port of flange connector 4, which not only can prevent external fire source from entering tank 1 to cause danger, but also can play a role in adjusting pressure when the pressure in tank is abnormal.

[0033] One end of connecting seat is connected with the output end of second connecting pipeline 3, and the other end is connected with flame arrestor 6, to ensure the orderly flow of gas, and flame arrestor 6 plays a key role in preventing flame from propagating reversely in the system, to protect the safety of oil tank. Special flame-resistant material is usually used, which has excellent heat resistance and corrosion resistance, and can work normally even in extreme oil and gas environment.

[0034] Programmable valve 7 is located at the outlet end of the flame arrester 6, and controls the flow of gas by opening and closing actions, and its output end is connected to the flange pipe to realize the distribution of gas to different paths.

[0035] The flange elbow pipe is connected to the oil and gas recovery pipeline 8, and the other end of the oil and gas recovery pipeline 8 is connected to the recovery tank. The oil and gas recovery pipeline 8 is made of pipeline material with good oil resistance and corrosion resistance to ensure long-term stable operation.

[0036] The control unit, as the brain of the system, receives pressure signals from the pressure transmitter module and controls the system according to the preset threshold. The specific control logic is as follows:

[0037] Exhalation process:

[0038] When the gas pressure in the tank body 1 rises to the upper limit of the exhalation pressure threshold (80% of the exhalation pressure of the flame arrester breathing valve 5), the control unit receives the signal from the pressure transmitter module, opens the programmable valve 7, and the oil and gas in the tank body is discharged into the recovery tank through the second connecting pipeline 3, the connecting seat, the flame arrester 6, the programmable valve 7, the flange pipe and the oil and gas recovery pipeline 8.

[0039] When the gas pressure in the tank body 1 drops to the lower limit of the exhalation pressure threshold (20% of the exhalation pressure of the flame arrester breathing valve 5), the control unit closes the programmable valve 7 to stop discharging.

[0040] Inhalation process:

[0041] When the gas pressure in the tank body 1 drops to the lower limit of the inhalation pressure threshold (80% of the inhalation pressure of the flame arrester breathing valve 5), the control unit opens the programmable valve 7, and the oil and gas in the recovery tank is inhaled into the tank body 1 through the oil and gas recovery pipeline 8, the flange pipe, the programmable valve 7, the flame arrester 6, the connecting seat and the second connecting pipeline 3.

[0042] When the gas pressure in the tank body 1 rises to the upper limit of the inhalation pressure threshold (20% of the inhalation pressure of the flame arrester breathing valve 5), the control unit closes the programmable valve 7 to stop inhaling.

[0043] Through the pressure transmitter module and the control unit, real-time monitoring and automatic adjustment of the gas pressure are realized, the safety and efficiency of the operation are improved, through the oil and gas recovery pipeline and the recovery tank, the oil and gas discharged from the tank are effectively recovered, the environmental pollution is reduced, the setting of the flame arrester breathing valve and the flame arrester ensures the safe release of the tank when the pressure is abnormal, prevents the spread of fire, ensures that the pressure in the tank fluctuates within a safe range, ensures the stability of the gas pressure in the tank, improves safety and reduces environmental pollution.

[0044] Specifically, the present application also provides a low-oxygen gas pipeline, which opens the programmable valve 7 to make the low-oxygen gas enter the tank body 1 when the gas pressure reaches the lower limit of the pressure.

[0045] The pressure transmitter module transmits the monitoring data to the control unit in real time, the control unit continuously receives and processes the pressure information and compares it with the pre-set lower threshold. The lower threshold is set to 80% of the lower limit of the breathing valve 5 of the flame arrester, in order to intervene in advance to prevent the pressure in the tank from being too low to produce negative pressure (to prevent the breathing valve of the flame arrester 6 from moving to prevent external air from entering the tank 1), and to ensure that the tank operates in a safe and stable pressure range.

[0046] On the basis of the above embodiment, the flange connector 4 is further provided with a third port, and a sampling pipeline 9 is communicated with the third port. The other end of the sampling pipeline 9 is communicated with an analysis assembly for monitoring the oxygen concentration in the tank 1. The analysis assembly is signal connected with the control unit.

[0047] When the analysis assembly monitors that the oxygen concentration data of the gas in the tank is within the safe threshold range, it indicates that the oxygen concentration of the gas in the tank meets the safety standards for storage and operation, and no processing will be performed, and the original pressure control and oil and gas processing operation will be maintained.

[0048] When the oxygen concentration data analyzed by the analysis assembly exceeds the safe threshold, the control unit sends an opening signal to the program-controlled valve 7, and the oil and gas with high oxygen concentration in the tank will be discharged to the corresponding processing device through the oil and gas recovery pipeline 8 under the action of the pressure difference. At the same time, in order to ensure that the oxygen concentration in the tank can finally be reduced to the safe threshold, the system will continuously collect and analyze the gas in the tank. Until the oxygen concentration of the gas in the tank is reduced to the safe threshold, the control unit sends a closing signal to the program-controlled valve 7. The oxygen concentration safety threshold of the oil and gas can be selected according to actual needs.

[0049] On the basis of the above embodiment, an alarm module is further included, and the alarm module is signal connected with the control unit. When the gas pressure in the tank 1 exceeds the pre-set safe range or the oxygen concentration reaches the pre-set alarm threshold, the control unit triggers the alarm module to alarm. The alarm module includes a remote alarm signal transmitter for sending an alarm signal to a remote monitoring center, so that the operator can know.

[0050] The number of pressure transmitter modules is three groups, and the three groups are connected in parallel with the first port of the flange connector 4, each of the three groups of pressure transmitter modules comprises a pressure transmitter 10 and a switch valve 11 arranged on the pipeline, that is, during the operation of the system, the three groups of pressure transmitter modules simultaneously monitor the gas pressure in the tank 1. The pressure transmitter 10 transmits the real-time measured pressure data to the control unit, and the control unit comprehensively analyzes the three groups of data. Through comparison and processing of multiple groups of data, the actual pressure condition in the tank 1 can be more accurately judged, and the misjudgment caused by a single sensor failure or error can be reduced. The switch valve 11 is used to control the on-off of the group of pressure transmitter modules, and when it is necessary to maintain or overhaul a certain group of modules, the corresponding switch valve 11 can be closed to isolate the module, without affecting the normal work of other modules.

[0051] On the basis of the above embodiment, the shell 12 connected with the connecting seat is further included, the flame arrester 6 and the program-controlled valve 7 are located in the shell 12, and the explosion-proof control box 13 is further arranged in the shell 12, and the control unit is arranged in the explosion-proof control box 13. By arranging the flame arrester 6 and the program-controlled valve 7 in the shell 12 and arranging the control unit in the explosion-proof control box 13, the explosion-proof performance of the system is effectively improved, and the possibility of explosion and other dangerous accidents caused by equipment failure or external factors is reduced.

[0052] On the basis of the above embodiment, the program-controlled valve 7 is an explosion-proof electric valve with an emergency shutdown function, so as to ensure that the oil tank is physically separated from other equipment in the case of system failure or emergency, and the long-term stable and safe operation of the system is ensured.

[0053] On the basis of the above embodiment, the control unit adopts an advanced programmable logic controller (PLC), which has a control algorithm and a logic program built-in and can accurately process signals transmitted by the pressure transmitter module. Through digital signal processing and analysis technology, the pressure signal is accurately judged, and accurate control instructions are sent to the program-controlled valve 7.

[0054] It should be noted that in the present specification, relational terms such as first and second are used only to differentiate one entity from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities.

[0055] The principle and implementation mode of the present application are described by using specific examples in the present application, and the above description of the embodiments is only used to help understand the method and core idea of the present application. It should be pointed out that for ordinary skilled persons in the technical field, without departing from the principle of the present application, the present application can be improved and modified in many ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A vapor tight head assembly characterized by, The utility model relates to a kind of oil gas recovery device for tank, including: Tank body (1), first connecting pipe (2) and second connecting pipe (3) are provided on the tank body (1); Flange connector (4) is communicated with the output end of the first connecting pipe (2), and the first port and the second port are provided on the flange connector (4); Pressure transmitter module is communicated with the first port of the flange connector (4), and the pressure transmitter module is used to monitor the air pressure in the tank body (1), and signal connection is established with control unit; Flame arrestor breather valve (5) is communicated with the second port of the flange connector (4); Connecting seat, one end is communicated with the output end of the second connecting pipe (3), and the other end is communicated with flame arrestor (6), and the outlet end of the flame arrestor (6) is provided with program-controlled valve (7), the output end of the program-controlled valve (7) is connected flange pipe, the output end of the flange pipe is connected oil gas recovery pipe (8), and the output end of the oil gas recovery pipe (8) is communicated recovery tank, and the program-controlled valve is signal connected with the control unit, when the air pressure in the tank body (1) rises to the upper limit of exhalation pressure threshold, the control unit opens the program-controlled valve (7), when the air pressure in the tank body (1) drops to the lower limit of inhalation pressure threshold, the control unit closes the program-controlled valve (7);When the air pressure in the tank body (1) drops to the lower limit of inhalation pressure threshold, the control unit opens the program-controlled valve (7);When the air pressure in the tank body (1) rises to the upper limit of inhalation pressure threshold, the control unit closes the program-controlled valve (7).

2. The vapor tight top of a tank as defined in claim 1, wherein, The flange connector (4) is further provided with third port, and the third port is communicated with sampling pipe (9), and the other end of the sampling pipe (9) is communicated with analysis component, for monitoring the oxygen concentration in the tank body (1), and the analysis component is signal connected with the control unit.

3. The vapor tight top of a tank as defined in claim 2 wherein, Further including alarm module, the alarm module is signal connected with the control unit, when the air pressure in the tank body (1) exceeds preset safety range or oxygen concentration reaches preset alarm threshold, the control unit triggers the alarm module to alarm.

4. The vapor tight top of a tank as defined in claim 3, wherein, The alarm module includes audible and visual alarm and / or remote alarm signal transmitter, and the remote alarm signal transmitter is used to send alarm signal to remote monitoring center.

5. The vapor tight top of a tank as defined in claim 2 wherein, The number of the pressure transmitter module is three groups, and is connected in parallel with the first port of the flange connector (4), and each group of the pressure transmitter module includes pressure transmitter (10) and switch valve (11) arranged on pipe.

6. The vapor tight top of a tank as defined in claim 1, wherein, Further including shell (12) connected with the connecting seat, the flame arrestor (6) and the program-controlled valve (7) are located in the shell (12), and the shell (12) is further provided with explosion-proof control box (13), and the control unit is arranged in the explosion-proof control box (13).

7. The tank top gas seal apparatus of claim 1, wherein, The program-controlled valve (7) is explosion-proof electric valve with emergency shutdown feature.

8. The tank top gas seal apparatus of claim 7, wherein, The control unit is PLC.

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