Oil gas treatment and recovery system

Abstract

The utility model discloses an oil gas treatment and recovery system which comprises an oil product storage tank, a crane pipe oil gas pipeline, an oil gas header pipe, an explosion-proof fan, a heat exchanger, a pre-cooling device, a shallow cooling device, a deep cooling device, an oil separator, an adsorption tank and a recovered oil storage tank, the storage tank vent air and oil gas generated in the filling process of the crane pipe are fed into the oil gas header pipe to be converged, and unified oil gas recovery treatment is carried out, so that the problems of environmental pollution, resource waste and low oil product yield caused by discharge of the vent air are avoided; the oxygen content in the mixed oil gas can be monitored through the oxygen content sensor, when the oxygen content is higher than 6%, an alarm is started, and the nitrogen valve is opened to charge nitrogen into the pipeline to reduce the oxygen content; when the oxygen content reaches 8%, the emergency discharge valve is opened, the oil gas is emptied on site, the anti-explosion fan is stopped, and the oil gas is temporarily recovered, so that explosion caused by too high oxygen concentration can be avoided, and the safety and reliability of the system are improved.

Description

Technical field:

[0001] The utility model relates to the field of oil and gas processing, in particular to an oil and gas processing and recovery system. Background technology:

[0002] In chemical enterprises, a large amount of oil and gas is generated during the venting of various oil storage tanks and the filling of cranes. Since the oxygen content in such oil and gas is relatively high, in order to prevent the high oxygen content in the oil and gas from causing explosions in the oil and gas pipelines, at present, enterprises directly discharge such oil and gas into the air. The various organic components contained in the exhaust gas cause serious odor on site, which is not conducive to environmental protection, does not meet the requirements of safety management regulations, and is not conducive to the health of workers; at the same time, the direct discharge of organic components in the exhaust gas will also cause a waste of resources, reduce the output of oil products, and affect the economic benefits of the enterprise. Utility model content:

[0003] In order to solve the above problems, the purpose of the utility model is to provide an oil and gas processing and recovery system.

[0004] The utility model is implemented by the following technical solutions:

[0005] An oil and gas processing and recovery system, comprising an oil storage tank, a crane oil and gas pipeline, an oil and gas main pipe, an explosion-proof fan, a heat exchanger, a precooling device, a shallow cooling device, a deep cooling device, an oil separator, an adsorption tank and a recovery oil storage tank;

[0006] The vent of the oil storage tank and the air outlet end of the crane pipe oil and gas pipeline are both connected to the air inlet end of the oil and gas main pipe, the air outlet end of the oil and gas main pipe is connected to the air inlet end of the explosion-proof fan, the air outlet end of the explosion-proof fan is connected to the heat medium inlet of the heat exchanger, the heat medium outlet of the heat exchanger is connected to the air inlet end of the precooling device through a pipeline, the air outlet end of the precooling device is connected to the air inlet end of the shallow cooling device through a pipeline, the air outlet end of the shallow cooling device is connected to the inlet of the deep cooling device through a pipeline, the outlet of the deep cooling device is connected to the inlet of the oil separator through a pipeline, the liquid outlet of the oil separator is connected to the inlet of the recovered oil storage tank through a pipeline, the air outlet of the oil separator is connected to the cold medium inlet of the heat exchanger through a pipeline, the cold medium outlet of the heat exchanger is connected to the adsorption inlet of the adsorption tank through a pipeline, and the adsorption outlet of the adsorption tank is connected to the air inlet of the exhaust pipe through a pipeline.

[0007] Furthermore, an oxygen content sensor, a flow sensor, a temperature sensor and a pressure sensor are respectively provided at the gas outlet of the oil and gas main pipe; a vent is also provided at the gas outlet of the oil and gas main pipe, and an emergency discharge valve is provided at the vent;

[0008] The signal output ends of the oxygen content sensor, the flow sensor, the temperature sensor and the pressure sensor are all signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the signal input end of the emergency discharge valve and the explosion-proof fan.

[0009] Furthermore, a fire-blocking single-call valve is provided on the pipeline connecting the oil storage tank and the oil and gas main pipeline and the crane pipe oil and gas pipeline.

[0010] Furthermore, the number of the adsorption tanks is two, the two adsorption tanks are arranged in parallel, and switching valves are provided at the inlet and outlet of the two adsorption tanks.

[0011] Furthermore, an alarm is included, and the signal output terminal of the controller is signal-connected to the signal input terminal of the alarm.

[0012] Furthermore, it also includes a nitrogen source, the gas outlet of the nitrogen source is connected to the oil and gas main pipe through a nitrogen purge pipeline, and a nitrogen valve is provided on the nitrogen purge pipeline;

[0013] The signal output terminal of the controller is signal-connected to the signal input terminal of the nitrogen valve.

[0014] Advantages of the utility model:

[0015] By sending the vented air from the storage tank and the oil and gas generated during the crane filling process into the oil and gas main pipe for merging, and conducting unified oil and gas recovery treatment, environmental pollution caused by the discharge of vented air, waste of resources, and low oil production can be avoided; the oxygen content in the mixed oil and gas can be monitored by the oxygen content sensor. When the oxygen content is higher than 6%, the alarm is activated and the nitrogen valve is opened to fill the pipeline with nitrogen to reduce the oxygen content; when the oxygen content reaches 8%, the controller interlocks to open the emergency discharge valve to vent the oil and gas on the spot, and at the same time stops the explosion-proof fan and suspends the recovery of oil and gas. This can avoid explosions caused by too high oxygen concentrations and improve the safety and reliability of the system. Description of the drawings:

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 Schematic diagram of system connection of this embodiment;

[0018] Figure 2 This is a control principle diagram of this embodiment.

[0019] In the figure: PetroChina 1# storage tank 1, PetroChina 2# storage tank 2, crude phenol storage tank 3, methanol storage tank 4, crane oil and gas pipeline 5, oil and gas main pipe 6, explosion-proof fan 7, heat exchanger 8, pre-cooling device 9, shallow cooling device 10, deep cooling device 11, oil separator 12, adsorption tank 13, recovered oil storage tank 14, flame-blocking single call valve 15, switching valve 16, nitrogen source 17, nitrogen purge pipeline 18, oxygen content sensor 19, flow sensor 20, temperature sensor 21, pressure sensor 22, controller 23, emergency discharge valve 24, alarm 25, nitrogen valve 26, exhaust pipe 27. Specific implementation method:

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Embodiment 1:

[0022] like Figure 1 , 2 The oil and gas processing and recovery system shown in the figure includes an oil storage tank, a crane oil and gas pipeline 5, an oil and gas main pipe 6, an explosion-proof fan 7, a heat exchanger 8, a precooling device 9, a shallow cooling device 10, a deep cooling device 11, an oil separator 12, an adsorption tank 13 and a recovery oil storage tank 14;

[0023] The vent of the oil storage tank and the outlet end of the crane oil and gas pipeline 5 are both connected to the inlet end of the oil and gas main pipe 6, the outlet end of the oil and gas main pipe 6 is connected to the inlet end of the explosion-proof fan 7, the outlet end of the explosion-proof fan 7 is connected to the heat medium inlet of the heat exchanger 8, the heat medium outlet of the heat exchanger 8 is connected to the inlet end of the precooling device 9 through a pipeline, the outlet end of the precooling device 9 is connected to the inlet end of the shallow cooling device 10 through a pipeline, and the outlet end of the shallow cooling device 10 is connected to the The inlet of the cryogenic device 11 is connected, the outlet of the cryogenic device 11 is connected to the inlet of the oil separator 12 through a pipeline, the liquid outlet of the oil separator 12 is connected to the inlet of the recovery oil storage tank 14 through a pipeline, the gas outlet of the oil separator 12 is connected to the cold medium inlet of the heat exchanger 8 through a pipeline, the cold medium outlet of the heat exchanger 8 is connected to the adsorption inlet of the adsorption tank 13 through a pipeline, and the adsorption outlet of the adsorption tank 13 is connected to the air inlet of the exhaust pipe 27 through a pipeline. There are two adsorption tanks 13, which are arranged in parallel, and switching valves 16 are arranged at the inlet and outlet of the two adsorption tanks 13.

[0024] A fire-blocking single-call valve 15 is provided on the pipeline connecting the oil storage tank and the oil and gas main 6 and the crane oil and gas pipeline 5.

[0025] An oxygen content sensor 19, a flow sensor 20, a temperature sensor 21 and a pressure sensor 22 are respectively provided at the gas outlet of the oil and gas main pipe 6; a vent is also provided at the gas outlet of the oil and gas main pipe 6, and an emergency discharge valve 24 is provided at the vent; the present embodiment further includes an alarm 25 and a nitrogen source 17, the gas outlet of the nitrogen source 17 is connected to the oil and gas main pipe 6 through a nitrogen purge pipeline 18, and a nitrogen valve 26 is provided on the nitrogen purge pipeline 18;

[0026] The signal output ends of the oxygen content sensor 19, the flow sensor 20, the temperature sensor 21 and the pressure sensor 22 are all connected to the signal input ends of the controller 23, and the signal output end of the controller 23 is connected to the signal input ends of the emergency discharge valve 24, the explosion-proof fan 7, the alarm 25 and the nitrogen valve 26.

[0027] Job Description:

[0028] In this embodiment, the oil storage tanks include a CNPC 1# storage tank 1, a CNPC 2# storage tank 2, a crude phenol storage tank 3 and a methanol storage tank 4. The vented air from the CNPC 1# storage tank 1, the CNPC 2# storage tank 2, the crude phenol storage tank 3 and the methanol storage tank 4 and the oil and gas generated during the crane filling process collected by the crane oil and gas pipeline 5 are sent to the oil and gas main pipe 6 for merging, and the oil and gas are first sent to the heat exchanger 8 through the explosion-proof fan 7 for heat exchange cooling, and the cooled oil and gas then enter the pre-cooling device 9, the shallow cooling device 10 and the deep cooling device 11 in turn for deep condensation, so that the oil in the oil and gas is condensed from gas to liquid, and then passes through the oil separator 12 for gas-liquid separation, so that the oil is separated and sent to the recovery oil storage tank 14, which can be used in the sewage treatment section to provide ammonia nitrogen and nutrient sources for biochemical treatment. However, after deep condensation, the uncondensed low-concentration oil and gas has very little oil content and a low temperature, and can be used as a cold medium to enter the heat exchanger 8 for preliminary cooling of the collected oil and gas. After heat exchange, in order to avoid direct discharge of the uncondensed low-concentration oil and gas, which will still cause pollution to the environment, it needs to be sent to the adsorption tank 13 for adsorption. Two adsorption tanks 13 are one open and one standby. When one adsorption tank 13 is in the "primary adsorption" working state, the second adsorption tank 13 is in the "secondary desorption" state. The exhaust gas after adsorption can meet the emission standards and is discharged into the atmosphere through the exhaust pipe 27 (exhaust pipe height ≥ 15m).

[0029] At the same time, the present embodiment can monitor the oxygen content in the mixed oil and gas in the oil and gas main pipe 6 through the oxygen content sensor 19. When the oxygen content is higher than 6%, the alarm is activated, and the nitrogen valve 26 is opened to fill the pipeline with nitrogen to reduce the oxygen content. When the oxygen content drops to 5%, the nitrogen valve 26 is closed and the purge is stopped; when the oxygen content reaches 8%, the controller 23 is interlocked to open the emergency discharge valve 24 to vent the oil and gas on the spot, and the explosion-proof fan 7 is stopped at the same time, and the recovery and processing of the oil and gas is suspended.

[0030] This embodiment also monitors the oil and gas pressure collected in the oil and gas main pipe 6 through the pressure sensor 22. When the pressure in the oil and gas main pipe 6 is monitored to be lower than 0.3kPa, an alarm is issued to remind personnel of the low pressure alarm. When the pressure continues to be lower than 0.2kPa, an interlock is triggered to stop the explosion-proof fan 7 and stop the recovery of oil and gas. When the pressure in the oil and gas main pipe 6 is monitored to be higher than 2.0kPa, an alarm is issued to remind personnel of the high pressure alarm.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An oil and gas processing and recovery system, characterized in that: Including oil storage tanks, crane oil and gas pipelines, oil and gas mains, explosion-proof fans, heat exchangers, pre-cooling devices, shallow cooling devices, deep cooling devices, oil separators, adsorption tanks and recovered oil storage tanks; The vent of the oil storage tank and the air outlet end of the crane pipe oil and gas pipeline are both connected to the air inlet end of the oil and gas main pipe, the air outlet end of the oil and gas main pipe is connected to the air inlet end of the explosion-proof fan, the air outlet end of the explosion-proof fan is connected to the heat medium inlet of the heat exchanger, the heat medium outlet of the heat exchanger is connected to the air inlet end of the precooling device through a pipeline, the air outlet end of the precooling device is connected to the air inlet end of the shallow cooling device through a pipeline, the air outlet end of the shallow cooling device is connected to the inlet of the deep cooling device through a pipeline, the outlet of the deep cooling device is connected to the inlet of the oil separator through a pipeline, the liquid outlet of the oil separator is connected to the inlet of the recovered oil storage tank through a pipeline, the air outlet of the oil separator is connected to the cold medium inlet of the heat exchanger through a pipeline, the cold medium outlet of the heat exchanger is connected to the adsorption inlet of the adsorption tank through a pipeline, and the adsorption outlet of the adsorption tank is connected to the air inlet of the exhaust pipe through a pipeline.

2. The oil and gas processing and recovery system according to claim 1, characterized in that: An oxygen content sensor, a flow sensor, a temperature sensor and a pressure sensor are respectively provided at the gas outlet end of the oil and gas main pipe; a vent is also provided at the gas outlet end of the oil and gas main pipe, and an emergency discharge valve is provided at the vent; The signal output ends of the oxygen content sensor, the flow sensor, the temperature sensor and the pressure sensor are all signal-connected to the signal input end of the controller, and the signal output end of the controller is signal-connected to the signal input end of the emergency discharge valve and the explosion-proof fan.

3. The oil and gas processing and recovery system according to claim 1, characterized in that: The pipeline connecting the oil storage tank and the oil and gas main pipeline and the crane pipe oil and gas pipeline are both provided with a fire-blocking single-call valve.

4. The oil and gas processing and recovery system according to claim 1, characterized in that: There are two adsorption tanks, which are arranged in parallel, and switching valves are arranged at the inlets and outlets of the two adsorption tanks.

5. The oil and gas processing and recovery system according to claim 2, characterized in that: An alarm is also included, and the signal output end of the controller is signal-connected to the signal input end of the alarm.

6. The oil and gas processing and recovery system according to claim 2, characterized in that: It also includes a nitrogen source, the gas outlet of which is connected to the oil and gas main pipe through a nitrogen purge pipeline, and a nitrogen valve is provided on the nitrogen purge pipeline; The signal output terminal of the controller is signal-connected to the signal input terminal of the nitrogen valve.

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