CN215722549U - One-stop hydrocarbon vapor recovery system - Google Patents

One-stop hydrocarbon vapor recovery system Download PDF

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Publication number
CN215722549U
CN215722549U CN202122182109.XU CN202122182109U CN215722549U CN 215722549 U CN215722549 U CN 215722549U CN 202122182109 U CN202122182109 U CN 202122182109U CN 215722549 U CN215722549 U CN 215722549U
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valve
pressure
end connected
tank
medium
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郭继红
李军
豆建笃
李虎
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Meishan Makeonline Crop Co ltd
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Meishan Makeonline Crop Co ltd
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Abstract

The utility model discloses a one-stop hydrocarbon vapor recovery system, which comprises a medium-pressure collecting system, a normal-pressure collecting system, a tail gas isolating system, an air distribution regulating system and a liquid collecting tankRecovery and gas storage system, emergency emptying system and N2A source and a PLC controller. The application provides a one-stop hydrocarbon vapor recovery system, the recovery processing of four kinds of hydrocarbon vapor of process area safety pressure release exhaust gas, crude oil tank district settling oil tank breather valve exhaust gas, crude oil tank district sewage tank breather valve exhaust gas and sewage district effluent water sump volatilize gas of crude oil united station has been solved, the problem that crude oil tank district settling oil tank breather valve breathes in and crude oil tank district sewage tank breather valve breathes in and causes the interior oxygen content of jar to exceed standard has still been effectually solved simultaneously, very big improvement the security, the feature of environmental protection and the economic nature of process area operation of crude oil united station.

Description

One-stop hydrocarbon vapor recovery system
Technical Field
The present application relates to the field of hydrocarbon vapor recovery, and in particular to a one-station hydrocarbon vapor recovery system.
Background
Due to the high importance of the country on energy conservation and environmental protection, the device for decompressing the hydrocarbon steam in the process area of the crude oil united station is impossible to directly discharge to the atmosphere, and the recycling of the hydrocarbon steam becomes unprecedented pressure.
Crude oil is combined station crude oil tank district settlement oil tank and sewage district sewage jar and is mostly dome jar structure, and the space in the jar can reduce along with the oil increases, and the rapid rising of pressure leads to the big breather valve directly to empty, and the jar gas is the higher oil gas of concentration most this moment in jar, will seriously air pollution after the discharge. And oil mist formed by the discharge of high-concentration oil gas has great potential safety hazard, and a fire disaster is easily caused. In addition, when the liquid level of the storage tank is reduced, negative pressure is formed in the tank, and the breather valve can act to suck air, so that the oxygen content in the tank exceeds the standard, and potential safety hazards are formed. Almost all oil dome jars are balanced the gas in the jar body through this kind of breather valve at present, and uneconomic when using, do not protect the environment, also unsafe.
The sewage tank of the sewage treatment area of the crude oil station often causes safety risks such as explosion and the like due to accumulation of volatile hydrocarbon steam, and at present, no method capable of effectively solving the problems exists in China. The collection of volatile hydrocarbon vapors from the lagoon is not only an environmental concern, but also a safety concern.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the application provides a one-stop hydrocarbon vapor recovery system, which solves the recovery treatment of four kinds of hydrocarbon vapor of safe pressure relief exhaust gas in a process area of a crude oil united station, crude oil tank area settling oil tank breather valve exhaust gas, crude oil tank area sewage tank breather valve exhaust gas and sewage area sewage pool volatile gas, and also effectively solves the problem that the oxygen content in a crude oil tank area settling oil tank breather valve inhales gas and the oxygen content in a crude oil tank area sewage tank breather valve inhales gas exceeds the standard, thereby greatly improving the safety, environmental protection and economical efficiency of the operation of the process area of the crude oil united station.
The one-stop hydrocarbon vapor recovery system comprises a medium-pressure collecting system connected with a safety relief valve, a normal-pressure collecting system connected with a breather valve of a settling oil tank, a tail gas isolating system connected with a breather valve of a sewage tank, an air distribution regulating system connected with a sewage pool, a liquid collecting tank connected with the medium-pressure collecting system, the normal-pressure collecting system, the tail gas isolating system and the air distribution regulating system, a recovered gas storage system connected with the medium-pressure collecting system, the normal-pressure collecting system, the tail gas isolating system and the liquid collecting tank, an emergency emptying system connected with the medium-pressure collecting system, the normal-pressure collecting system, the tail gas isolating system and the recovered gas storage system, and an N (N) exhaust system connected with the medium-pressure collecting system, the normal-pressure collecting system, the tail gas isolating system and the recovered gas storage system2Source, and simultaneously with the medium-pressure collection system, the normal-pressure collection system, the tail gas isolation system, the air distribution regulation system, the recovery gas storage system, the emergency evacuation system and the N2And a PLC controller connected with the source.
Preferably, the medium-pressure collecting system comprises a medium-pressure collecting device, a control valve SV-11, a pressure transmitter PT-01, an automatic drain valve AD-01, one end of the automatic drain valve AD-01 is connected with the bottom end of the medium-pressure collecting device, the other end of the automatic drain valve AD-01 is connected with a liquid collecting tank, one end of the automatic drain valve AD-01 is connected with the medium-pressure collecting device, and the other end of the automatic drain valve AD-01 is connected with the N liquid collecting tank2A control valve SV-13 connected with a source, and a regulating valve RV-01 with one end connected with the medium-pressure collecting device and the other end connected with a recovery and gas storage system;
preferably, the normal pressure collecting system consists of a normal pressure collecting device, a control valve SV-21 with one end connected with the normal pressure collecting device and the other end connected with a breather valve of the settling oil tank after passing through a shut-off valve HV-02, and pressure arranged on the normal pressure collecting deviceA force transducer PT-02, an automatic drain valve AD-02 with one end connected to the bottom end of the normal pressure collecting device and the other end connected to the liquid collecting tank, one end connected to the normal pressure collecting device and the other end connected to N2A control valve SV-23 connected with a source, and an adjusting valve RV-02 with one end connected with a normal pressure collecting device and the other end connected with a recycling and gas storing system.
Preferably, the tail gas isolation system comprises a tail gas isolation device, a pressure transmitter PT-03 arranged on the tail gas isolation device, an automatic drain valve AD-03 with one end connected to the bottom end of the tail gas isolation device and the other end connected with the liquid collection tank, and an automatic drain valve AD-03 with one end connected with the tail gas isolation device and the other end connected with N2A control valve SV-33 connected with a source and an adjusting valve RV-03 with one end connected with a tail gas isolating device and the other end connected with a recovery and gas storage system; wherein, a gas return pipe is also arranged between the tail gas isolating device and the liquid collecting tank.
Preferably, the air distribution regulating system consists of an air distribution regulating device, a centrifugal fan CF-01 with one end connected with the air distribution regulating device and the other end connected with the sewage pool after passing through a shut-off valve HV-04, a regulating valve RV-04 with one end connected with the air distribution regulating device and the other end connected with instrument air after passing through an air filtering pressure reducing valve UFR-01, an analytical instrument AT-04 arranged on the air distribution regulating device, a pressure transmitter PT-04 arranged on the air distribution regulating device, an automatic liquid discharge valve AD-04 with one end connected with the air distribution regulating device and the other end connected with a liquid collecting tank, and a centrifugal fan CF-02 with one end connected with the air distribution regulating device and the other end connected with an air distribution port of a combustion furnace.
Preferably, the recovery gas storage system comprises a recovery gas storage tank, a pressure transmitter PT-05 arranged on the recovery gas storage tank, a back pressure valve BPR-01 with one end connected with the recovery gas storage tank and the other end connected with a raw material gas inlet of a combustion furnace through a control valve SV-01, a control valve SV-02 with one end connected with the recovery gas storage tank and the other end connected with a natural gas pipe network through an air filter valve UFR-02, and a pressure transmitter PT-05 with one end connected with the recovery gas storage tank and the other end connected with the N2The compressor CP-01 is connected with the source, and the compressor CP-02 is connected with the compressor CP-01 in parallel through a pipeline; whereinAnd the bottom of the recovery gas storage tank is provided with a pipeline connected with the liquid collection tank.
Further, a sewage pump WP-01 with one end connected with the liquid collecting tank and the other end connected with the sewage tank is arranged on the liquid collecting tank, and a liquid level transmitter LM-01 is also arranged on the liquid collecting tank;
the emergency evacuation system comprises a centrifugal fan CF-03, a control valve SV-12 with one end connected with a medium-pressure collecting device and the other end connected with an air inlet of the centrifugal fan CF-03, a control valve SV-22 with one end connected with a normal-pressure collecting device and the other end connected with the air inlet of the centrifugal fan CF-03, and a tail gas isolating device with one end connected with a tail gas isolating device, a control valve SV-32 with the other end connected with the air inlet of the centrifugal fan CF-03, a pressure relief valve PRV-01 with one end connected with the recovery air storage tank and the other end connected with the air outlet of the centrifugal fan CF-03, a pressure transmitter PT-01 arranged on the medium pressure collecting device, a pressure transmitter PT-02 arranged on the normal pressure collecting device and a pressure transmitter PT-03 arranged on the tail gas isolating device; wherein, the air outlet of the centrifugal fan CF-03 is communicated with the atmosphere;
said N is2The source being high purity N2Steel cylinder, N2A control valve SV-03 is arranged on the source;
flame arresters FA are arranged between the shut-off valve HV-01 and the control valve SV-11, between the shut-off valve HV-02 and the control valve SV-21, between the shut-off valve HV-03 and the control valve SV-31, between the shut-off valve HV-04 and the centrifugal fan CF-01, between the centrifugal fan CF-02 and a combustion furnace air distribution port, between the control valve SV-01 and a combustion furnace raw material gas inlet, at two ends of the compressor CP-01, at two ends of the compressor CP-02 and at an air outlet of the centrifugal fan CF-03 respectively.
Compared with the prior art, the method has the following beneficial effects:
(1) the utility model is provided with a medium-pressure collecting system which can collect the safety pressure relief exhaust gas in the process area of the crude oil united station, and a compressor is adopted to pressurize the hydrocarbon steam in the medium-pressure collecting device and send the hydrocarbon steam to a recovery gas storage tank for storage; meanwhile, the hydrocarbon vapor pressure of the medium-pressure collecting device is monitored in real time, and the hydrocarbon vapor in the recovered gas storage tank is replenished to the medium-pressure collecting device through the regulating valve, so that the pressure of the medium-pressure collecting device is constant, and the VOCS discharged by the safety relief valves which are expected to be connected is completely recycled.
(2) The utility model is provided with a normal pressure collecting system which can collect hydrocarbon steam discharged by the breather valve of the settling oil tank, and a compressor is adopted to pressurize the hydrocarbon steam in the normal pressure collecting device and send the hydrocarbon steam to a recovery gas storage tank for storage; meanwhile, the hydrocarbon vapor pressure of the normal pressure collecting device is monitored in real time, and the hydrocarbon vapor in the recovered gas storage tank is replenished to the normal pressure collecting device through the regulating valve, so that the pressure of the normal pressure collecting device is constant, the system is ensured to ensure that a breather valve of the settling tank is not opened through vapor phase balance, and the zero emission treatment of the VOCS of the settling tank is realized.
(3) The tail gas isolation device is provided with a tail gas isolation system, and can collect hydrocarbon steam discharged by a breather valve of a sewage tank, and the hydrocarbon steam in the tail gas isolation device is pressurized by a compressor and is sent to a recovery gas storage tank for storage; meanwhile, the hydrocarbon vapor pressure of the tail gas isolation device is monitored in real time, and the hydrocarbon vapor in the recovered gas storage tank is fed back to the tail gas isolation device through the regulating valve, so that the pressure of the tail gas isolation device is a constant set value, and the system is ensured to ensure that a breather valve of the sewage tank is not opened through gas phase balance, thereby achieving VOCS zero emission treatment of the sewage tank; meanwhile, the tail gas isolation device is designed into an inlet and outlet gas isolation structure, so that the high-concentration recovered hydrocarbon steam is ensured not to flow into the low-concentration submerged tank, and the safety of the sewage tank is ensured.
(4) The utility model is provided with the air distribution adjusting system, hydrocarbon steam volatilized in the sewage pool can be pumped into the air distribution adjusting device through the fan for collection, hydrocarbon steam clusters are scattered through the internal structure of the air distribution adjusting device and are fully and uniformly mixed with air, the device is matched with the hydrocarbon analyzer to monitor the LEL value of the hydrocarbon in real time, so that the instrument air distribution adjusting valve is controlled, and the content of the hydrocarbon steam in the air distribution adjusting device is adjusted to be within 25% of the lower explosion limit.
(5) The utility model solves the recovery treatment of four hydrocarbon vapors of safe pressure relief exhaust gas in a process area of the crude oil united station, crude oil tank area settling oil tank breather valve exhaust gas, crude oil tank area sewage tank breather valve exhaust gas and sewage area sewage pool volatile gas, and simultaneously effectively solves the problem that the content of oxygen in the tank exceeds the standard after the crude oil tank area settling oil tank breather valve inhales gas and the crude oil tank area sewage tank breather valve inhales gas, thereby greatly improving the safety, environmental protection and economy of the operation of the process area of the crude oil united station.
Additional features of the present application will be set forth in part in the description which follows. Additional features of some aspects of the present application will be apparent to those of ordinary skill in the art in view of the following description and accompanying drawings, or in view of the production or operation of the embodiments. The features disclosed in this application may be realized and attained by practice or use of various methods, instrumentalities and combinations of the specific embodiments described below.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. Like reference symbols in the various drawings indicate like elements. Wherein,
FIG. 1 is a schematic diagram of the system of the present invention.
Description of reference numerals: RV and adjusting valve; CP, compressor; CF. A centrifugal fan; LM, liquid level transducer; SV, control valves; AT, analytical instrumentation; PT, pressure transmitter; WP, sewage pump; UFR, air filtration relief valve; BPR, back pressure valve; PRV, pressure relief valve; AD. An automatic drain valve; FA. A flame arrestor; HV, shutoff valve.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that if the terms "first", "second", etc. are used in the description and claims of this application and in the above-described drawings, they are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, if the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this application, if the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "center", "vertical", "horizontal", "lateral", "longitudinal", etc. are referred to, their indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, in this application, the terms "mounted," "disposed," "provided," "connected," "sleeved," and the like should be construed broadly if they are referred to. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
As shown in FIG. 1, the one-stop hydrocarbon vapor recovery system comprises a medium-pressure collection system connected with a safety relief valve, a normal-pressure collection system connected with a breather valve of a settling tank, a tail gas isolation system connected with a breather valve of a sewage tank, an air distribution regulation system connected with a sewage tank, a liquid collection tank simultaneously connected with the medium-pressure collection system, the normal-pressure collection system, the tail gas isolation system and the air distribution regulation system, a recovered gas storage system simultaneously connected with the medium-pressure collection system, the normal-pressure collection system, the tail gas isolation system and the liquid collection tank, an emergency evacuation system simultaneously connected with the medium-pressure collection system, the normal-pressure collection system, the tail gas isolation system and the recovered gas storage system, and an N-type evacuation system simultaneously connected with the medium-pressure collection system, the normal-pressure collection system, the tail gas isolation system and the recovered gas storage system2The system comprises a source and a PLC (programmable logic controller) which is simultaneously connected with a medium-pressure collecting system, a normal-pressure collecting system, a tail gas isolating system, an air distribution adjusting system, a recycling and gas storage system, an emergency evacuation system and an N2 source.
The PLC is connected with the electric control components arranged in the systems and is used for finely controlling the electric control components of the systems. The method for controlling the electric control component by the PLC controller is the prior art in the field, and a person skilled in the art can complete the setting and use of the PLC controller without creative labor, which is not described herein.
Wherein, safety relief valve, sedimentation oil tank breather valve, sewage tank breather valve and effluent water sump are the prior art in the crude oil united station, and it is redundant here to do not give unnecessary details.
The medium-pressure collecting system consists of a medium-pressure collecting device, one end of which is connected with the medium-pressure collecting device, and the other end of which is connected with a safety pressure relief valve after passing through a shut-off valve HV-01A control valve SV-11 connected with the pressure transmitter PT-01 arranged on the medium pressure collecting device, an automatic drain valve AD-01 with one end connected with the bottom end of the medium pressure collecting device and the other end connected with the liquid collecting tank, one end connected with the medium pressure collecting device and the other end connected with N2A control valve SV-13 connected with a source, and a regulating valve RV-01 with one end connected with the medium pressure collecting device and the other end connected with a recovery and gas storage system.
The adjusting signal of the PLC controller to the adjusting valve RV-01 is provided by the pressure transmitter PT-01.
The medium-pressure collection system can collect the safe pressure relief exhaust gas in the process area of the crude oil united station, and a compressor is adopted to pressurize and send hydrocarbon steam in the medium-pressure collection device into a recovery gas storage tank for storage; meanwhile, the hydrocarbon vapor pressure of the medium-pressure collecting device is monitored in real time, and the hydrocarbon vapor in the recovered gas storage tank is replenished to the medium-pressure collecting device through the regulating valve, so that the pressure of the medium-pressure collecting device is constant, and the VOCS discharged by the safety relief valves which are expected to be connected is completely recycled.
The normal pressure collecting system consists of a normal pressure collecting device, a control valve SV-21, a pressure transmitter PT-02, an automatic drain valve AD-02, one end of the automatic drain valve AD-02 is connected with the bottom end of the normal pressure collecting device, the other end of the automatic drain valve AD-02 is connected with a liquid collecting tank, one end of the automatic drain valve AD-02 is connected with the normal pressure collecting device, and the other end of the automatic drain valve AD-02 is connected with the N tank2A control valve SV-23 connected with a source, and an adjusting valve RV-02 with one end connected with a normal pressure collecting device and the other end connected with a recycling and gas storing system.
The adjusting signal of the PLC controller to the adjusting valve RV-02 is provided by the pressure transmitter PT-02 and the pressure transmitter cascade of the settling tank breather valve, and in the embodiment, the pressure transmitter PT-0A and the pressure transmitter PT-0B are arranged on the settling tank breather valve.
The normal pressure collecting system can collect hydrocarbon steam discharged by the breather valve of the settling oil tank, and a compressor is adopted to pressurize the hydrocarbon steam in the normal pressure collecting device and send the hydrocarbon steam to the recovery gas storage tank for storage; meanwhile, the hydrocarbon vapor pressure of the normal pressure collecting device is monitored in real time, and the hydrocarbon vapor in the recovered gas storage tank is replenished to the normal pressure collecting device through the regulating valve, so that the pressure of the normal pressure collecting device is constant, the system is ensured to ensure that a breather valve of the settling tank is not opened through vapor phase balance, and the zero emission treatment of the VOCS of the settling tank is realized.
The tail gas isolation system comprises a tail gas isolation device, a pressure transmitter PT-03 arranged on the tail gas isolation device, an automatic drain valve AD-03 with one end connected to the bottom end of the tail gas isolation device and the other end connected with a liquid collection tank, and an automatic drain valve AD-03 with one end connected with the tail gas isolation device and the other end connected with N2A control valve SV-33 connected with a source and an adjusting valve RV-03 with one end connected with a tail gas isolating device and the other end connected with a recovery and gas storage system; wherein, a gas return pipe is also arranged between the tail gas isolating device and the liquid collecting tank.
The adjusting signal of the PLC controller to the adjusting valve RV-03 is provided by the pressure transmitter PT-03 and the pressure transmitter cascade of the sewage tank breather valve, and in the embodiment, the sewage tank breather valve is provided with the pressure transmitter PT-0C and the pressure transmitter PT-0D.
The tail gas isolation system can collect hydrocarbon steam discharged by a breather valve of the sewage tank, and the hydrocarbon steam in the tail gas isolation device is pressurized by a compressor and is sent to a recovery gas storage tank for storage; meanwhile, the hydrocarbon vapor pressure of the tail gas isolation device is monitored in real time, and the hydrocarbon vapor in the recovered gas storage tank is fed back to the tail gas isolation device through the regulating valve, so that the pressure of the tail gas isolation device is a constant set value, and the system is ensured to ensure that a breather valve of the sewage tank is not opened through gas phase balance, thereby achieving VOCS zero emission treatment of the sewage tank; meanwhile, the tail gas isolation device needs to be provided with an inlet and outlet gas isolation structure, so that the high-concentration recovered hydrocarbon steam cannot flow into the low-concentration submerged tank, and the safety of the sewage tank is guaranteed.
The air distribution adjusting system consists of an air distribution adjusting device, a centrifugal fan CF-01, an adjusting valve RV-04, an analytical instrument AT-04, a pressure transmitter PT-04, an automatic liquid discharge valve AD-04, and a centrifugal fan CF-02, wherein one end of the centrifugal fan CF-01 is connected with the air distribution adjusting device, the other end of the centrifugal fan CF-01 is connected with a sewage pool after passing through a shut-off valve HV-04, one end of the adjusting valve RV-04 is connected with the air distribution adjusting device, the other end of the adjusting valve RV-01 is connected with instrument air, the analytical instrument AT-04 is arranged on the air distribution adjusting device, the pressure transmitter PT-04 is arranged on the air distribution adjusting device, one end of the automatic liquid discharge valve AD-04 is connected with the air distribution adjusting device, the other end of the automatic liquid discharge valve AD-04 is connected with a liquid collection tank, and one end of the centrifugal fan CF-02 is connected with the air distribution adjusting device and the other end of a combustion furnace air distribution port.
The PLC controller provides a regulating signal for controlling the regulating valve RV-04 by the analytical instrument AT-04.
The air distribution adjusting system can pump the volatile hydrocarbon steam in the sewage tank into the air distribution adjusting device through the fan for collection, the hydrocarbon steam is scattered through the internal structure of the air distribution adjusting device and is fully and uniformly mixed with air, the hydrocarbon analyzer matched with the device monitors the LEL value of the hydrocarbon in real time, so that the instrument air ratio adjusting valve is controlled, and the content of the hydrocarbon steam in the air distribution adjusting device is adjusted to be within 25% of the lower explosion limit.
The recycling gas storage system comprises a recycling gas storage tank, a pressure transmitter PT-05 arranged on the recycling gas storage tank, a back pressure valve BPR-01 with one end connected with the recycling gas storage tank and the other end connected with a raw gas inlet of a combustion furnace through a control valve SV-01, a control valve SV-02 with one end connected with the recycling gas storage tank and the other end connected with a natural gas pipe network through an air filter valve UFR-02, a recycling gas storage tank and an N-type gas pipe network2The compressor CP-01 is connected with the source, and the compressor CP-02 is connected with the compressor CP-01 in parallel through a pipeline; wherein, the bottom of the recovery gas storage tank is provided with a pipeline connected with the liquid collection tank.
The PLC controller adjusts the adjusting signal of the control valve SV-01 to be provided by the pressure transmitter PT-05, and simultaneously the PLC controller controls the raw material control valve of the combustion furnace according to the adjusting signal of the pressure transmitter PT-05.
The hydrocarbon steam collected in the medium-pressure collection system, the normal-pressure collection system and the tail gas isolation system can be effectively pressurized and stored by the recovery gas storage system, and the stored hydrocarbon steam is sent to the raw gas inlet of the combustion furnace, so that the hydrocarbon steam can be used as a combustion material, the pollution to the atmosphere caused by the direct discharge of the hydrocarbon steam is avoided, the utilization rate of the hydrocarbon steam can be increased, and the economical efficiency of enterprise production is improved.
The liquid collecting tank is provided with a sewage pump WP-01, one end of the sewage pump WP-01 is connected with the liquid collecting tank, the other end of the sewage pump WP-01 is connected with a sewage tank, and the liquid collecting tank is further provided with a liquid level transmitter LM-01.
The opening and closing signals of the PLC controller for opening and closing the sewage pump WP-01 are provided by the liquid level transmitter LM-01.
The emergency evacuation system comprises a centrifugal fan CF-03, a control valve SV-12 with one end connected with a medium-pressure collecting device and the other end connected with an air inlet of the centrifugal fan CF-03, a control valve SV-22 with one end connected with a normal-pressure collecting device and the other end connected with the air inlet of the centrifugal fan CF-03, and a tail gas isolating device with one end connected with a tail gas isolating device, a control valve SV-32 with the other end connected with the air inlet of the centrifugal fan CF-03, a pressure relief valve PRV-01 with one end connected with the recovery air storage tank and the other end connected with the air outlet of the centrifugal fan CF-03, a pressure transmitter PT-01 arranged on the medium pressure collecting device, a pressure transmitter PT-02 arranged on the normal pressure collecting device and a pressure transmitter PT-03 arranged on the tail gas isolating device; wherein, the air outlet of the centrifugal fan CF-03 is communicated with the atmosphere.
The PLC controls the opening and closing of the control valve SV-12 through the adjusting signal of the pressure transmitter PT-01, controls the opening and closing of the control valve SV-22 through the adjusting signal of the pressure transmitter PT-02, and controls the opening and closing of the control valve SV-32 through the adjusting signal of the pressure transmitter PT-03.
Said N is2The source being high purity N2Steel cylinder, N2A control valve SV-03 is arranged on the source; the N is2The source may also be other carrier high purity N2The load bearing structure of (1).
Flame arresters FA are arranged between the shut-off valve HV-01 and the control valve SV-11, between the shut-off valve HV-02 and the control valve SV-21, between the shut-off valve HV-03 and the control valve SV-31, between the shut-off valve HV-04 and the centrifugal fan CF-01, between the centrifugal fan CF-02 and a combustion furnace air distribution port, between the control valve SV-01 and a combustion furnace raw material gas inlet, at two ends of the compressor CP-01, at two ends of the compressor CP-02 and at an air outlet of the centrifugal fan CF-03 respectively.
Each pipeline of the system is also provided with a plurality of hand valves as shown in fig. 1, so that an operator can manually control the on/off of the pipeline, and the whole system can be conveniently debugged or maintained by the operator. The setting and use of the hand valve are conventional in the art, and can be accomplished by those skilled in the art without creative efforts, which are not described herein.
In addition, the mere exchange of positions of the components connected in series on the same pipeline or the equivalent replacement of a component by a structure with the same function belongs to the solution that can be easily conceived by those skilled in the art according to the disclosure of the present application, and therefore, the disclosure of the present application shall be considered and fall within the protection scope of the present application.
The recovery method of the one-station hydrocarbon steam recovery system comprises the following steps:
(1) natural gas and high purity N before system start-up2Sweeping the pipe;
(11) sweeping pipes of the medium-pressure collecting system, the normal-pressure collecting system, the tail gas isolating system, the recycling and storing system and the emergency emptying system through natural gas;
the specific process is as follows:
adjusting an air filtration pressurizing valve UFR-02, controlling a control valve SV-02, a control valve SV-12, a control valve SV-22, a control valve SV-32, an adjusting valve RV-01, an adjusting valve RV-02 and an adjusting valve RV-03 to be opened, starting a centrifugal fan CF-03 to sweep a natural gas pipe, and monitoring the oxygen content in a system pipeline in real time through an analysis instrument AT-01, an analysis instrument AT-02 and an analysis instrument AT-03 in the process of sweeping the natural gas pipe; when the oxygen content in the system pipeline monitored by the analytical instrument AT-01, the analytical instrument AT-02 and the analytical instrument AT-03 is lower than 1%, the centrifugal fan CF-03 and the control valve SV-02 are closed, and the process of natural gas pipe sweeping is further completed.
(12) By passing high purity N2Sweeping the medium-pressure collecting system, the normal-pressure collecting system, the tail gas isolating system, the recycling and gas storing system and the emergency emptying system;
the specific process is as follows:
opening control valve SV-03, control valve SV-13, control valve SV-23 and control valve SV-33 to make N2High purity N in source2Entering the pipeline of the system and then entering the pipeline of the system,monitoring the oxygen content in the system pipeline in real time through an analytical instrument AT-01, an analytical instrument AT-02 and an analytical instrument AT-03; when the analytical instrument AT-01, the analytical instrument AT-02 and the analytical instrument AT-03 monitor that the oxygen content in the system pipeline is lower than 1%, the compressor CP-01 is started, and the control valve SV-03, the control valve SV-12, the control valve SV-22 and the control valve SV-32 are closed, so that the high-purity N is finished2And (5) a pipe sweeping process.
(2) Starting a system;
the medium-pressure collection system, the normal-pressure collection system, the tail gas isolation system, the air distribution regulation system, the liquid collection tank and the recovery and gas storage system are matched to work;
opening a control valve SV-11, a control valve SV-21 and a control valve SV-31 and then starting a system; the operation processes of the medium-pressure collecting system, the normal-pressure collecting system, the tail gas isolating system, the air distribution adjusting system, the liquid collection tank and the recovery and gas storage system after the system is started are respectively as follows:
medium pressure collection system: hydrocarbon steam discharged by the pressure relief valve enters the medium-pressure collecting device through a shut-off valve HV-01, a flame arrester FA and a control valve SV-11, a pressure transmitter PT-01 arranged on the medium-pressure collecting device monitors the pressure inside the medium-pressure collecting device in real time, and a regulating valve RV-01 is controlled in a feedback mode to keep the pressure inside the medium-pressure collecting device constant;
a normal pressure collection system: hydrocarbon steam is discharged from the settling oil tank through a breather valve arranged at the top of the settling oil tank, the hydrocarbon steam enters a normal pressure collecting device through a shut-off valve HV-02, a flame arrester FA and a control valve SV-21, and a regulating valve RV-02 is controlled in a cascade mode through a pressure transmitter PT-02 and a pressure transmitter arranged on the breather valve at the top of the settling oil tank, so that the hydrocarbon steam pressure in the settling oil tank is smaller than the opening pressure, and the recovery inhibition effect is achieved;
tail gas isolation system: hydrocarbon steam is discharged from the sewage tank through a breather valve arranged at the top of the sewage tank, the hydrocarbon steam enters a tail gas isolation device through a shut-off valve HV-03, a flame arrester FA and a control valve SV-31, a pressure transmitter PT-03 arranged on the tail gas isolation device and a pressure transmitter cascade control regulating valve RV-03 arranged on the breather valve at the top of the sewage tank ensure that the hydrocarbon steam pressure in the sewage tank is smaller than the opening pressure, so that the recovery inhibition effect is achieved;
air distribution regulating system: hydrocarbon steam in the sewage tank is extracted into an air distribution adjusting device through a centrifugal fan CF-01, the air distribution adjusting device monitors the LEL value of the internal hydrocarbon content in real time through an analytical instrument AT-04, the entering instrument air is adjusted through an adjusting valve RV-04, the instrument air enters the air distribution adjusting device and then is mixed with the hydrocarbon steam, the LEL content of the hydrocarbon steam is further diluted, the hydrocarbon content is ensured to be lower than 25% of LEL, and the mixed hydrocarbon steam is sent into an air distribution opening of a combustion furnace through a centrifugal fan CF-02 so as to finish environment-friendly and energy-saving treatment on the hydrocarbon steam;
liquid collection tank: condensed dirty oil and sewage in the medium-pressure collecting device, the normal-pressure collecting device and the tail gas isolating device automatically drain into a liquid collecting tank through an automatic drain valve AD-01, an automatic drain valve AD-02 and an automatic drain valve AD-03 respectively, the liquid level of the liquid is monitored in real time through a liquid level transmitter LM-01 arranged in the liquid collecting tank, the liquid level is enabled to be at a normal level by controlling the start and stop of a sewage pump WP-01, and meanwhile, the liquid level is connected with the tail gas isolating device through a gas return pipe, so that the gas pressure in the liquid collecting tank is kept balanced;
and (3) recovering the gas storage system: hydrocarbon steam in the medium-pressure collecting device, the normal-pressure collecting device and the tail gas isolating device respectively enters a compressor CP-01 or CP-02 through a control valve SV-13, a control valve SV-23 and a control valve SV-33 to be pressurized and then enters a recovery gas storage tank, and when a pressure transmitter monitors that the pressure in the recovery gas storage tank reaches a set value, the control valve SV-01 and a raw material gas control valve of a combustion furnace are started, so that the hydrocarbon steam enters a raw material gas inlet of the combustion furnace to be subjected to environment-friendly and energy-saving treatment.
(3) Early warning and monitoring of an emergency evacuation system;
the safe operation of a medium-pressure collecting system, a normal-pressure collecting system, a tail gas isolating system and a recycling and gas storing system is ensured through an emergency emptying system;
the operation process of the emergency evacuation system is as follows:
medium-pressure collection device: when an analysis instrument AT-01 monitors that the oxygen content in the medium-pressure collection device exceeds 1%, opening a control valve SV-12 and a centrifugal fan CF-03 in an emergency manner, closing the control valve SV-13, and emptying hydrocarbon steam in the medium-pressure collection device; after the oxygen content in the medium-pressure collecting device is lower than 0.5 percent, closing a control valve SV-12 and a centrifugal fan CF-03, and opening a control valve SV-13 to recover normal operation;
the normal pressure collecting device comprises: when the analysis instrument AT-02 monitors that the oxygen content in the normal pressure collection device exceeds 1%, opening a control valve SV-22 and a centrifugal fan CF-03 in an emergency manner, closing the control valve SV-23, and emptying hydrocarbon steam in the normal pressure collection device; after the oxygen content in the normal pressure collecting device is lower than 0.5 percent, closing a control valve SV-22 and a centrifugal fan CF-03, and opening a control valve SV-23 to recover normal operation;
tail gas isolating device: when the analysis instrument AT-03 monitors that the oxygen content in the normal pressure collection device exceeds 1%, opening the control valve SV-32 and the centrifugal fan CF-03 in an emergency manner, closing the control valve SV-33, and emptying hydrocarbon steam in the normal pressure collection device; after the oxygen content in the normal pressure collecting device is lower than 0.5 percent, closing a control valve SV-32 and a centrifugal fan CF-03, and opening a control valve SV-33 to recover normal operation;
and (3) recovering the gas storage tank: when the recovery air storage tank generates overpressure, the pressure relief valve PRV-01 is automatically opened when the pressure exceeds a set opening value, and is automatically closed when the pressure in the recovery air storage tank is reduced and is lower than the set closing pressure of the pressure relief valve PRV-01.
The control and the monitoring of each device in the process are all completed through PLC control, the control accuracy and the monitoring real-time performance can be effectively improved, the overall operation safety, the stability and the accuracy of the system can be effectively improved, the requirements of the industry are better met, and the development of the industry is promoted.
In addition, the above-described embodiments are exemplary, and those skilled in the art, having benefit of this disclosure, will appreciate numerous solutions that are within the scope of the disclosure and that fall within the scope of the utility model. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the utility model is defined by the claims and their equivalents.

Claims (10)

1. The one-stop hydrocarbon vapor recovery system is characterized by comprising a medium-pressure collecting system connected with a safety relief valve, a normal-pressure collecting system connected with a breather valve of a settling oil tank, a tail gas isolating system connected with a breather valve of a sewage tank, an air distribution regulating system connected with a sewage pool, a liquid collecting tank simultaneously connected with the medium-pressure collecting system, the normal-pressure collecting system, the tail gas isolating system and the air distribution regulating system, a recovery and gas storage system simultaneously connected with the medium-pressure collecting system, the normal-pressure collecting system, the tail gas isolating system and the liquid collecting tank, an emergency emptying system simultaneously connected with the medium-pressure collecting system, the normal-pressure collecting system, the tail gas isolating system and the recovery and gas storage system, and an N (N) emptying system simultaneously connected with the medium-pressure collecting system, the normal-pressure collecting system, the tail gas isolating system and the gas storage system2Source, and simultaneously with the medium-pressure collection system, the normal-pressure collection system, the tail gas isolation system, the air distribution regulation system, the recovery gas storage system, the emergency evacuation system and the N2And a PLC controller connected with the source.
2. The one-stop hydrocarbon vapor recovery system according to claim 1, wherein the medium-pressure collection system comprises a medium-pressure collection device, a control valve SV-11 having one end connected to the medium-pressure collection device and the other end connected to a safety relief valve via a shut-off valve HV-01, a pressure transmitter PT-01 provided on the medium-pressure collection device, an automatic drain valve AD-01 having one end connected to the bottom end of the medium-pressure collection device and the other end connected to the liquid collection tank, and an N-connection valve having one end connected to the medium-pressure collection device and the other end connected to the medium-pressure collection device2A control valve SV-13 connected with a source, and a regulating valve RV-01 with one end connected with the medium pressure collecting device and the other end connected with a recovery and gas storage system.
3. The one-station hydrocarbon vapor recovery system as set forth in claim 2, wherein the atmospheric pressure collection system is composed of an atmospheric pressure collection device, a control valve SV-21 having one end connected to the atmospheric pressure collection device and the other end connected to a breather valve of the settling tank via a shut-off valve HV-02, and a control valve SV-21 provided in the atmospheric pressure collection deviceA pressure transmitter PT-02 on the normal pressure collecting device, an automatic drain valve AD-02 with one end connected to the bottom end of the normal pressure collecting device and the other end connected with the liquid collecting tank, one end connected with the normal pressure collecting device and the other end connected with N2A control valve SV-23 connected with a source, and an adjusting valve RV-02 with one end connected with a normal pressure collecting device and the other end connected with a recycling and gas storing system.
4. The one-station hydrocarbon vapor recovery system of claim 3, wherein the tail gas isolation system comprises a tail gas isolation device, a pressure transmitter PT-03 arranged on the tail gas isolation device, an automatic drain valve AD-03 with one end connected to the bottom end of the tail gas isolation device and the other end connected to the liquid collection tank, one end connected to the tail gas isolation device and the other end connected to N2A control valve SV-33 connected with a source and an adjusting valve RV-03 with one end connected with a tail gas isolating device and the other end connected with a recovery and gas storage system; wherein, a gas return pipe is also arranged between the tail gas isolating device and the liquid collecting tank.
5. The one-stop hydrocarbon vapor recovery system according to claim 4, wherein the air distribution adjusting system is composed of an air distribution adjusting device, a centrifugal fan CF-01 having one end connected to the air distribution adjusting device and the other end connected to the wastewater tank through a shut-off valve HV-04, an adjusting valve RV-04 having one end connected to the air distribution adjusting device and the other end connected to instrument air through an air filtration pressure reducing valve UFR-01, an analyzing instrument AT-04 provided on the air distribution adjusting device, a pressure transmitter PT-04 provided on the air distribution adjusting device, an automatic drain valve AD-04 having one end connected to the air distribution adjusting device and the other end connected to the liquid collection tank, and a centrifugal fan CF-02 having one end connected to the air distribution adjusting device and the other end connected to the air distribution port of the combustion furnace.
6. The one-station hydrocarbon vapor recovery system of claim 5, wherein the recovery gas storage system comprises a recovery gas storage tank, a pressure transmitter PT-05 disposed on the recovery gas storage tank, and one end connected to the recovery gas storage tankThe other end of the valve is connected with a back pressure valve BPR-01 of a raw material gas inlet of a combustion furnace after passing through a control valve SV-01, one end of the valve is connected with a recovery gas storage tank, the other end of the valve is connected with a control valve SV-02 of a natural gas pipe network through an air filter valve UFR-02, one end of the valve is connected with the recovery gas storage tank, and the other end of the valve is connected with N2The compressor CP-01 is connected with the source, and the compressor CP-02 is connected with the compressor CP-01 in parallel through a pipeline; wherein, the bottom of the recovery gas storage tank is provided with a pipeline connected with the liquid collection tank.
7. The one-stop hydrocarbon vapor recovery system according to claim 6, wherein the liquid collection tank is provided with a sewage pump WP-01 having one end connected to the liquid collection tank and the other end connected to a sewage tank, and the liquid collection tank is further provided with a liquid level transmitter LM-01.
8. The one-stop hydrocarbon vapor recovery system according to claim 7, wherein the emergency evacuation system comprises a centrifugal fan CF-03, a control valve SV-12 having one end connected to the medium pressure collecting device and the other end connected to an air inlet of the centrifugal fan CF-03, a control valve SV-22 having one end connected to the normal pressure collecting device and the other end connected to an air inlet of the centrifugal fan CF-03, a control valve SV-32 having one end connected to the tail gas isolating device and the other end connected to an air inlet of the centrifugal fan CF-03, a pressure relief valve PRV-01 having one end connected to the recovery gas tank and the other end connected to an air outlet of the centrifugal fan CF-03, a pressure transmitter PT-01 provided on the medium pressure collecting device, a pressure transmitter PT-02 provided on the normal pressure collecting device, and a pressure transmitter PT-03 arranged on the tail gas isolation device; wherein, the air outlet of the centrifugal fan CF-03 is communicated with the atmosphere.
9. The one-station hydrocarbon vapor recovery system of claim 8, wherein the N is2The source being high purity N2Steel cylinder, N2The source is provided with a control valve SV-03.
10. The one-stop hydrocarbon vapor recovery system according to claim 9, wherein a flame arrester FA is respectively disposed between the shut-off valve HV-01 and the control valve SV-11, between the shut-off valve HV-02 and the control valve SV-21, between the shut-off valve HV-03 and the control valve SV-31, between the shut-off valve HV-04 and the centrifugal fan CF-01, between the centrifugal fan CF-02 and the furnace air distribution port, between the control valve SV-01 and the furnace raw material gas inlet, between both ends of the compressor CP-01, both ends of the compressor CP-02, and the air outlet of the centrifugal fan CF-03.
CN202122182109.XU 2021-09-09 2021-09-09 One-stop hydrocarbon vapor recovery system Active CN215722549U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113864646A (en) * 2021-09-09 2021-12-31 眉山麦克在线设备股份有限公司 One-stop hydrocarbon vapor recovery system and recovery method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113864646A (en) * 2021-09-09 2021-12-31 眉山麦克在线设备股份有限公司 One-stop hydrocarbon vapor recovery system and recovery method
CN113864646B (en) * 2021-09-09 2024-02-27 眉山麦克在线设备股份有限公司 One-stop hydrocarbon vapor recovery system and recovery method

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