CN111459092A - Flash evaporation gas recovery integrated device and recovery method - Google Patents

Flash evaporation gas recovery integrated device and recovery method Download PDF

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Publication number
CN111459092A
CN111459092A CN202010361750.7A CN202010361750A CN111459092A CN 111459092 A CN111459092 A CN 111459092A CN 202010361750 A CN202010361750 A CN 202010361750A CN 111459092 A CN111459092 A CN 111459092A
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China
Prior art keywords
gas
pipeline
valve
compressor
communicated
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CN202010361750.7A
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Chinese (zh)
Inventor
何蕾
薛岗
王登海
郑欣
胡建国
刘银春
杨光
杨家茂
何李鹏
李欣欣
周妮妮
王莉华
张颖
张璞
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China Textile Industry Design Institute
China National Petroleum Corp
Xian Changqing Technology Engineering Co Ltd
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China Textile Industry Design Institute
Xian Changqing Technology Engineering Co Ltd
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Priority to CN202010361750.7A priority Critical patent/CN111459092A/en
Publication of CN111459092A publication Critical patent/CN111459092A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00Programme-control systems
    • G05B19/02Programme-control systems electric
    • G05B19/04Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/05Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
    • G05B19/058Safety, monitoring
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00Measuring or testing not otherwise provided for
    • G01D21/02Measuring two or more variables by means not covered by a single other subclass
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D27/00Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
    • G05D27/02Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00Program-control systems
    • G05B2219/10Plc systems
    • G05B2219/16Plc to applications
    • G05B2219/163Domotique, domestic, home control, automation, smart, intelligent house

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

The invention provides a flash vapor recovery integrated device and a recovery method, which comprises a sledge seat, wherein a gas-liquid separation system, a pressurization system and a P L C control cabinet are arranged on the sledge seat, a gas outlet I of the gas-liquid separation system is communicated with the pressurization system, and the gas-liquid separation system and the pressurization system are both in electric signal connection with the P L C control cabinet.

Description

Flash evaporation gas recovery integrated device and recovery method
Technical Field
The invention belongs to the technical field of flash vapor recovery, and particularly relates to a flash vapor recovery integrated device and a recovery method.
Background
The dehydration and dealkylation processes of natural gas treatment plants in blocks such as Su Li Ge gas field and Shen mu gas field of the Changqing gas field adopt a propane refrigeration low-temperature separation process, and the propane refrigeration temperature is-15 ℃ (winter)/-5 ℃ (summer). Heavy hydrocarbon condensed from natural gas enters a flash evaporation separator to carry out gas-water-oil three-phase separation, the separated unstable condensate enters a condensate stabilizing device to generate stable condensate, and the separated flash evaporation gas and the overhead gas of a condensate stabilizing tower are connected into a fuel gas system for a heat conducting oil furnace or a low-pressure torch to burn.
The field operation has the following problems: (1) the heavy hydrocarbon component content in the flash evaporation gas is high, condensate is generated when the flash evaporation gas is used as fuel gas, the risk of flash explosion is generated when the heat-conducting oil furnace is ignited, and potential safety hazards exist; (2) the low-pressure torch is connected for combustion, the flash evaporation gas with liquid is not fully combusted, black smoke is generated, and the environment is not protected.
Disclosure of Invention
The invention aims to provide a flash evaporation gas recovery integrated device, which overcomes the technical problems in the prior art.
The invention also aims to provide a flash evaporation gas recovery method, which solves the problem of liquid carrying of flash evaporation gas and can be automatically and remotely controlled.
Therefore, the technical scheme provided by the invention is as follows:
the utility model provides an integration device is retrieved to flash distillation gas, includes the sledge seat, be equipped with gas-liquid separation system, turbocharging system and P L C switch board on the sledge seat, gas-liquid separation system's gas outlet one communicates with the turbocharging system, gas-liquid separation system and turbocharging system all with P L C switch board electricity signal connection.
Still be equipped with RTU on the sled seat, RTU communication connection monitored control system.
The gas-liquid separation system comprises a gas-liquid separator and a first gas inlet pipeline, wherein a first gas inlet of the gas-liquid separator is communicated with a first flash gas incoming pipeline through the first gas inlet pipeline, and a liquid level sensor is mounted on the gas-liquid separator;
the device comprises a gas inlet pipeline I, a flash evaporation gas inlet control valve and a pressure gauge I, wherein the gas inlet pipeline I is provided with the flash evaporation gas inlet control valve and the pressure gauge I, the gas-liquid separator is provided with the pressure gauge II, the gas inlet pipeline I is communicated with an emptying pipeline I, the emptying pipeline I is communicated with an emptying system, the emptying pipeline I is provided with a valve, the gas inlet pipeline I is provided with a pressure transmitter and a temperature transmitter, and the liquid level sensor, the pressure transmitter I and the temperature transmitter I are all electrically connected with a P L C control cabinet and/or an RTU.
The supercharging system comprises a compressor, a second air inlet pipeline is communicated with a second air inlet of the compressor, and a first air outlet of the gas-liquid separation system is communicated with the second air inlet of the compressor through the second air inlet pipeline;
the gas outlet two of compressor and handle and pass through the exhaust pipe line intercommunication between the factory raw material gas pipe network, be equipped with pressure transmitter two, manometer three, check valve, flowmeter and electric valve in proper order along gas flow direction on the exhaust pipe line, compressor, pressure transmitter two, flowmeter and electric valve all are connected with P L C switch board and/or RTU electricity.
The first air inlet pipeline is also communicated with a supplementary air source pipeline, and the communication point of the supplementary air source pipeline and the first air inlet pipeline is positioned between the mounting point of the first pressure transmitter and the communication point of the first emptying pipeline and the first air inlet pipeline;
and a pressure gauge IV, a supplementary gas source pipeline ball valve, a self-operated regulating valve and an electric ball valve I are sequentially arranged on the supplementary gas source pipeline along the gas flowing direction, and the self-operated regulating valve and the electric ball valve are electrically connected with a P L C control cabinet and/or an RTU.
The valve arranged on the first emptying pipeline comprises a first gate valve, a safety valve and a second gate valve which are sequentially arranged along the gas flowing direction;
the air inlet pipeline I is also communicated with a vent pipeline II, the vent pipeline II is communicated with a vent system, an electric ball valve II and a throttling stop valve are sequentially arranged on the vent pipeline II along the gas flowing direction, and the electric ball valve II is electrically connected with a P L C control cabinet and/or an RTU.
The exhaust pipeline is communicated with a third emptying pipeline, the third emptying pipeline is communicated with an emptying system, a ball valve is arranged on the third emptying pipeline, and the third emptying pipeline is communicated with the exhaust pipeline between the flowmeter and the check valve.
An emergency drain outlet and a manual cleaning drain outlet are formed in the bottom of the gas-liquid separator, a drain ball valve is arranged at the emergency drain outlet, the manual cleaning drain outlet is communicated with a drain pipeline, a cleaning ball valve is arranged on the drain pipeline, and the drain pipeline is communicated with a condensate oil pipeline;
the compressor drain of the supercharging system is communicated with a drain pipeline, a liquid discharge gate valve is arranged on the drain pipeline, the drain pipeline is communicated with a condensate pipeline, a drain is arranged on the exhaust pipeline of the compressor, a drain pipeline four is communicated with the drain, and a drain gate valve is arranged on the drain pipeline four.
The compressor is including the separator one, one-level cylinder, one-level air-cooled cooler, separator two, second grade cylinder, second grade air-cooled cooler and the separator three that communicate in proper order, install temperature sensor two on the pipeline between the second grade gas vent of second grade cylinder and the second grade air-cooled cooler, separator three-way pipeline and the two intercommunications of gas outlet of compressor, install pressure transmitter three on this pipeline, temperature sensor two and pressure transmitter three all are connected with P L C switch board and/or RTU electricity.
A method for recovering flash evaporation gas adopts an integrated device for recovering flash evaporation gas, wherein the flash evaporation gas comes from a flash evaporation gas incoming pipeline and enters a gas-liquid separator through a gas inlet pipeline I and a gas inlet I of the gas-liquid separator, the gas is discharged from a gas outlet I of the gas-liquid separator after heavy hydrocarbon liquid drops carried by the gas are separated out, the gas enters a compressor of a pressurization system through a gas inlet pipeline II for pressurization and gas-liquid separation, the gas is pressurized to 1.8 MPa-2.5 MPa through the compressor, the gas is discharged to a raw gas pipe network of a treatment plant through a gas outlet II of the pressurization system for raw gas recovery, and the heavy hydrocarbon separated by the gas-liquid separator and the pressurization system is discharged to a condensate oil stabilizing device;
when the first pressure transmitter on the first air inlet pipeline detects that the air inlet pressure is greater than the set upper limit value, the P L C control cabinet sends a command to close the first electric ball valve;
when the temperature of flash steam is higher than 135 ℃ or the outlet pressure of the compressor is higher than 2.555MPa after the compressor of the pressurization system is pressurized, the P L C control cabinet or the RTU sends an instruction to stop the compressor.
The invention has the beneficial effects that:
according to the integrated device for recovering the flash gas, the gas-liquid separation and pressurization are carried out on the flash gas in the natural gas treatment plant through the gas-liquid separation system and the pressurization system, heavy hydrocarbon components in the flash gas are separated, and the treated gas is used as raw material gas and is connected into a raw material gas pipe network, so that the environment is protected, potential safety hazards are eliminated, and the economic benefit is increased.
The invention relates to a combined device with the functions of flash gas-liquid separation, compressor pressurization, natural gas supply, flow measurement, remote emptying and the like, which recycles and accesses the flash gas into a raw material gas pipe network after liquid separation and pressurization, thereby solving the problem that the flash gas carries liquid and avoiding resource waste.
Meanwhile, an RTU is arranged to monitor the pressure, the temperature and the liquid level of a gas-liquid separator and a compressor on the skid seat, alarm for exceeding the limit, remote control of an electric ball valve and remote emergency stop control of the compressor in an accident state, and transmit all production data to a monitoring system of a natural gas treatment plant to realize remote monitoring and control.
In order to make the aforementioned and other objects of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a schematic view of the joint composition of the present invention;
fig. 2 is a schematic structural diagram of the present invention.
In the figure:
description of reference numerals:
1. a first air inlet; 2. a first air outlet; 3. an emergency sewage draining outlet 3; 4. manually cleaning a sewage draining outlet 4; 5. a second air inlet; 6. a second air outlet; 7. a vent port; 8. a sewage draining outlet; 9. a condensate line; 101. a first pressure gauge; 102. a flash evaporation gas inlet control valve; 103. a fourth pressure gauge; 104. a supplemental gas source pipeline ball valve; 105. a first gate valve; 106. a safety valve; 107. a second gate valve; 108. a throttle stop valve; 109. a second pressure gauge; 110. a blowdown ball valve; 111. a decontamination ball valve; 112. a first air inlet pipeline; 113. emptying a first pipeline; 114. a make-up gas supply line; 115. a second emptying pipeline; 116. a liquid discharge line; 200. a compressor; 201. a second air inlet pipeline; 202. an exhaust line; 203. a check valve; 204. a third pressure gauge; 205. a ball valve; 206. a blow-down gate valve; 207. a drain gate valve; 208. a first separator; 209. a second separator; 210. a third separator; 211. a primary cylinder; 212. a secondary cylinder; 213. a primary air-cooled cooler; 214. a secondary air-cooled cooler; 215. a crankcase; 216. a variable frequency main motor; 217. a third emptying pipeline; 218. a waste line; 219. a fourth emptying pipeline; 220. a primary exhaust port; 221. a secondary exhaust port; 301. a self-operated regulating valve; 302. a first electric ball valve; 303. a first pressure transmitter; 304. a first temperature sensor; 305. a second electric ball valve; 306. a liquid level sensor; 307. an electrically operated valve; 308. a flow meter; 309. a second pressure transmitter; 310. a second temperature sensor; 311. and a third pressure transmitter.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
In the present invention, the upper, lower, left and right in the drawings are regarded as the upper, lower, left and right of the integrated flash vapor recovery device described in the present specification.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1:
the embodiment provides an integrated device is retrieved to flash distillation gas, including the sledge seat, be equipped with gas-liquid separation system, turbocharging system and P L C switch board on the sledge seat, gas outlet one 2 and the turbocharging system intercommunication of gas-liquid separation system, gas-liquid separation system and turbocharging system all with P L C switch board electricity signal connection.
Specifically, the working process provided by this embodiment is as follows:
as shown in figure 1, the flash evaporation gas comes the gas and gets into gas-liquid separation system, separates out the heavy hydrocarbon liquid drop that carries, discharges from gas-liquid separation system, gets into the turbocharging system afterwards, retrieves after the pressure boost and inserts the feed gas pipe network, and the condensate oil stabilising arrangement is discharged to the heavy hydrocarbon component of separation.
The invention solves the problem that the flash evaporation gas carries liquid, avoids resource waste, eliminates potential safety hazard and protects environment.
Example 2:
on embodiment 1's basis, this embodiment provides a flash distillation gas recovery integration device, still be equipped with RTU on the sled seat, monitored control system is connected in the RTU communication.
And each operating parameter on the skid seat is monitored by the RTU, and all production data are transmitted to a monitoring system of the natural gas treatment plant, so that remote monitoring and control are realized.
Example 3:
on the basis of embodiment 2, the embodiment provides a flash gas recovery integrated device, the gas-liquid separation system includes a gas-liquid separator and a first gas inlet pipeline 112, a first gas inlet 1 of the gas-liquid separator is communicated with a first flash gas incoming pipeline through the first gas inlet pipeline 112, and the gas-liquid separator is provided with a liquid level sensor 306;
the device is characterized in that a flash evaporation gas inlet control valve 102 and a first pressure gauge 101 are arranged on the first air inlet pipeline 112, a second pressure gauge 109 is installed on the gas-liquid separator, the first air inlet pipeline 112 is communicated with a first emptying pipeline 113, the first emptying pipeline 113 is communicated with an emptying system, a valve is arranged on the first emptying pipeline 113, a pressure transmitter and a temperature transmitter are installed on the first air inlet pipeline 112, and the liquid level sensor 306, the first pressure transmitter 303 and the first temperature transmitter are all electrically connected with a P L C control cabinet and/or an RTU.
As shown in FIG. 2, the value of a liquid level sensor 306 is monitored through a P L C control cabinet, the liquid level of the gas-liquid separator can be remotely monitored through an RTU, the inlet air pressure of a first air inlet pipeline 112 is measured through a first pressure transmitter 303, the inlet air temperature of the first air inlet pipeline 112 is measured through a first temperature sensor 304, and a first air vent pipeline 113 is used for constant-pressure air release and emergency air release.
The working process is as follows: flash distillation gas comes from flash distillation gas incoming gas pipeline, in the gas inlet 1 through air inlet pipeline 112 and gas liquid separator gets into gas liquid separator, after the heavy hydrocarbon liquid drop that the separation carried, gas is discharged from gas liquid separator's gas outlet 2, compressor 200 through two 201 entering supercharging systems of air inlet pipeline carries out pressure boost and gas-liquid separation, after compressor 200 supercharges, gas is discharged to processing plant feed gas pipe network through supercharging systems and is carried out the feed gas recovery, gas liquid separator and the heavy hydrocarbon of supercharging systems separation are arranged to condensate oil stabilising arrangement.
Example 4:
on the basis of embodiment 2, the embodiment provides a flash vapor recovery integrated device, the pressurization system includes a compressor 200, a second air inlet pipeline 201 is communicated with a second air inlet 5 of the compressor 200, and a first air outlet 2 of the gas-liquid separation system is communicated with the second air inlet 5 of the compressor 200 through the second air inlet pipeline 201;
the second gas outlet 6 of the compressor 200 is communicated with a raw gas pipe network of a treatment plant through a gas exhaust line 202, a second pressure transmitter 309, a third pressure gauge 204, a check valve 203, a flow meter 308 and an electric valve 307 are sequentially arranged on the gas exhaust line 202 along the gas flow direction, and the compressor 200, the second pressure transmitter 309, the flow meter 308 and the electric valve 307 are all electrically connected with a P L C control cabinet and/or an RTU (remote terminal Unit), as shown in FIG. 2.
When the pressure of the exhaust pipeline 202 reaches the pressure required by a raw gas pipe network of a processing plant, the P L C control cabinet sends an instruction to open the electric valve 307, and processed flash gas is discharged into the raw gas pipe network.
Example 5:
on the basis of embodiment 3, the embodiment provides an integrated flash gas recovery device, the first air inlet line 112 is further communicated with a make-up air source line 114, and the communication point of the make-up air source line 114 and the first air inlet line 112 is located between the installation point of the first pressure transmitter 303 and the communication point of the first venting line 113 and the first air inlet line 112;
and a pressure gauge IV 103, a supplementary gas source pipeline ball valve 104, a self-operated regulating valve 301 and an electric ball valve I302 are sequentially arranged on the supplementary gas source pipeline 114 along the gas flowing direction, and the self-operated regulating valve 301 and the electric ball valve 205 are electrically connected with a P L C control cabinet and/or an RTU.
As shown in fig. 2, the first pressure transmitter 303 measures the inlet pressure of the first inlet line 112, when the inlet pressure of the first inlet line 112 is smaller than a set lower limit value, the supplementary gas source line ball valve 104 of the supplementary gas source line 114 is opened, the self-operated regulating valve 301 is opened when the set opening pressure is reached, the P L C control cabinet sends a command to open the first electric ball valve 302 to supplement natural gas, and when the inlet pressure of the first inlet line 112 is larger than the set upper limit value, the P L C control cabinet sends a command to close the first electric ball valve 302.
In this embodiment, the self-operated regulating valve 301 is set to be opened at 0.2MPa, when the inlet pressure of the gas-liquid separator is lower than 0.2MPa, the P L C control cabinet opens the electric ball valve 302 behind the self-operated regulating valve 301 to supplement the fuel gas, and when the inlet pressure of the gas-liquid separator is higher than 0.4MPa, the P L C control cabinet closes the electric ball valve 302 behind the self-operated regulating valve 301.
Example 6:
on the basis of embodiment 3, the embodiment provides an integrated flash vapor recovery device, and the valve arranged on the first vent line 113 includes a first gate valve 105, a safety valve 106 and a second gate valve 107 which are arranged in sequence along the gas flow direction;
the first air inlet pipeline 112 is also communicated with a second emptying pipeline 115, the second emptying pipeline 115 is communicated with an emptying system, a second electric ball valve 305 and a throttling stop valve 108 are sequentially arranged on the second emptying pipeline 115 along the air flowing direction, and the second electric ball valve 305 is electrically connected with a P L C control cabinet and/or an RTU (remote terminal Unit), as shown in FIG. 2.
When the equipment and the pipelines are maintained or the air inlet pressure on the air inlet pipeline I112 is too high, the safety valve 106 is automatically opened, the gate valve I105 and the gate valve II 107 are opened, and emptying is carried out through the emptying pipeline I113.
When the valve on the first air release pipeline 113 is in failure and cannot be released, the P L C control cabinet monitors the pressure value of the first pressure transmitter 303 in real time, and when the upper pressure limit is reached, the P L C control cabinet sends a command to open the second electric ball valve 305 and release air through the second release pipeline 115.
Example 7:
on the basis of embodiment 4, the embodiment provides an integrated flash gas recovery device, the exhaust line 202 is communicated with a vent line three 217, the vent line three 217 is communicated with a vent system, the vent line three 217 is provided with a ball valve 205, and a communication point of the vent line three 217 and the exhaust line 202 is located between the flow meter 308 and the check valve 203.
When manometer three 204 indicates that the pressure in the vent line 202 exceeds the upper pressure limit, ball valve 205 is opened and venting is performed via vent line three 217. As shown in fig. 2.
Example 8:
on the basis of embodiment 3, the embodiment provides an integrated flash evaporation gas recovery device, wherein an emergency drain 3 and a manual cleaning drain 4 are formed in the bottom of a gas-liquid separator, a drain ball valve 110 is arranged at the emergency drain 3, the manual cleaning drain 4 is communicated with a liquid drainage pipeline 116, a cleaning ball valve 111 is arranged on the liquid drainage pipeline 116, and the liquid drainage pipeline 116 is communicated with a condensate oil pipeline 9;
the blow-off outlet 8 of the compressor 200 of the supercharging system is communicated with a blow-off pipeline 218, the blow-off pipeline 218 is provided with a liquid discharge gate valve 207, the blow-off pipeline 218 is communicated with a condensate oil pipeline 9, the exhaust pipeline 202 of the compressor 200 is provided with a blow-off outlet 7, the blow-off outlet 7 is communicated with a blow-off pipeline IV 219, and the blow-off gate valve 206 is arranged on the blow-off pipeline IV 219.
As shown in fig. 2, the heavy hydrocarbon components separated by the gas-liquid separator and the pressurization system enter the condensate line 9 through the liquid discharge line 116 and the sewage discharge line 218, respectively, and finally enter the condensate stabilizing device. When the dirt cleaning ball valve 111 on the drainage pipeline 116 is in failure, the liquid can be drained through the emergency drain outlet 3.
Before the pressure-increasing compression is completed, after the gas pressure exceeds a safe value, the blow-down is performed through a blow-down line four 219.
Example 9:
on the basis of embodiment 4, this embodiment provides a flash evaporation gas recovery integration device, compressor 200 includes separator 208, first-stage cylinder 211, first-stage air-cooled cooler 213, separator two 209, second-stage cylinder 212, second-stage air-cooled cooler 214 and separator three 210 that communicate in proper order, install temperature sensor two 310 on the pipeline between second-stage gas vent 221 of second-stage cylinder 212 and second-stage air-cooled cooler 214, separator three 210 communicates with compressor 200's second 6 gas outlets through the pipeline, installs pressure transmitter three 311 on this pipeline, temperature sensor two 310 and pressure transmitter three 311 all are connected with P L C switch board and/or RTU electricity.
As shown in fig. 2, the primary cylinder 211 and the secondary cylinder 212 are both connected to a crankcase 215, and the crankcase 215 is connected to a variable frequency main motor 216.
The use process comprises the following steps: gas discharged from the gas outlet I2 of the gas-liquid separator enters the first separator 208 of the compressor 200 through the gas inlet pipeline II 201, enters the first-stage cylinder 211 after separation, is discharged from the first-stage gas outlet 220 of the first-stage cylinder 211 after compression, enters the first-stage air-cooled cooler 213 for cooling, enters the second separator 209 after cooling for gas-liquid separation, then enters the second-stage cylinder 212 for compression, is discharged from the second-stage gas outlet 221 after second-stage compression, enters the second-stage air-cooled cooler 214 for cooling, enters the third separator 210 after cooling for gas-liquid separation, and finally is discharged from the pressurization system through the second gas outlet 6.
The heavy hydrocarbon components separated by the first separator 208, the second separator 209 and the third separator 210 enter the condensate line 9 through respective drain lines 218 and finally enter a condensate stabilizing device.
Wherein, the pipeline intercommunication between one-level gas vent 220 of one-level cylinder 211 and one-level air-cooled cooler 213 has four 219 of blowdown pipelines, is equipped with safety valve and blowdown gate valve 206 on four 219 of blowdown pipelines, and after gas pressure exceeded the safe value, safety valve opened automatically, carries out the evacuation through four 219 of blowdown pipelines.
Example 10:
the embodiment provides a flash vapor recovery integrated device, flash vapor comes from a flash vapor incoming gas pipeline, enters a gas-liquid separator through a gas inlet pipeline I112 and a gas inlet I1 of the gas-liquid separator, after heavy hydrocarbon liquid drops carried by the gas-liquid separator are separated, the gas is discharged from a gas outlet I2 of the gas-liquid separator, enters a compressor 200 of a pressurization system through a gas inlet pipeline II 201 for pressurization and gas-liquid separation, the gas is pressurized to 1.8 MPa-2.5 MPa through the compressor 200, the gas is discharged to a raw gas pipe network of a treatment plant through a gas outlet II 6 of the pressurization system for raw gas recovery, and the heavy hydrocarbon separated by the gas-liquid separator and the pressurization system is discharged to a condensate oil stabilizing device;
when the first pressure transmitter 303 on the first air inlet pipeline 112 detects that the air inlet pressure is smaller than the set lower limit value, the supplementary air source pipeline ball valve 104 on the supplementary air source pipeline 114 is opened, the self-operated regulating valve 301 is opened when the set opening pressure is reached, the P L C control cabinet sends an instruction to open the first electric ball valve 302 to supplement natural gas, and when the first pressure transmitter 303 on the first air inlet pipeline 112 detects that the air inlet pressure is larger than the set upper limit value, the P L C control cabinet sends an instruction to close the first electric ball valve 302;
when the temperature of flash steam is higher than 135 ℃ or the outlet pressure of the compressor 200 is higher than 2.555MPa after the compressor 200 of the pressurization system is pressurized, the P L C control cabinet or the RTU sends an instruction to stop the compressor 200.
In this embodiment, the gas-liquid separator adopts a vertical separator, the operating pressure is 0.2-0.4 MPa, the flash evaporation gas enters the gas-liquid separator, after heavy hydrocarbon liquid drops carried by the flash evaporation gas are separated, the heavy hydrocarbon liquid drops are discharged from the top of the gas-liquid separator and enter the compressor 200, one path of natural gas is introduced into the flash evaporation gas inlet pipeline I112 to serve as a supplementary gas source, the supplementary natural gas pipeline is provided with an electric ball valve 205 and a self-operated regulating valve 301, and the self-operated regulating valve 301 is set to be opened at 0.2 MPa. When the gas inlet pressure of the gas-liquid separator is lower than 0.2MPa, the electric ball valve 205 behind the self-operated regulating valve 301 is opened to supplement fuel gas; when the inlet pressure of the gas-liquid separator is higher than 0.4MPa, the self-operated regulating valve 301 is closed, and then the electric ball valve 205 is operated. The first intake line 112 is provided with a first vent line 113 (constant pressure vent) and a second vent line 115 (emergency vent).
The gas-liquid separator is provided with a second pressure on-site display pressure gauge 109 for displaying the pressure in the separator; is provided with a manual cleaning drain outlet 4 which can be cleaned regularly and an emergency drain outlet 3 for emergency drainage.
The second air inlet line 201 and the exhaust line 202 are metal hoses to reduce the vibration of the lines. The flash evaporation gas enters a compressor 200, is pressurized to 1.8 MPa-2.5 MPa by the compressor 200 and is discharged as the raw material gas of a treatment plant for recovery; if the temperature of the flash steam after the secondary compression is higher than 135 ℃, or the pressure of the outlet of the compressor 200 is higher than 2.555MPa, remotely shutting down the compressor 200; the compressor 200 is provided with a vent 7 and a drain 8.
The design pressure of a vent line 202 of the compressor 200 is 4.0MPa, and the design pressure of a flash gas incoming line, a replenishing gas source line 114, a second inlet line of the compressor 200, a liquid drainage line 116 and a fourth emptying line 219 is 1.6 MPa. Corresponding pressure system grades can also be set according to actual operating pressures of different stations.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims (10)

1. The flash evaporation gas recovery integrated device is characterized by comprising a prying seat, wherein a gas-liquid separation system, a pressurization system and a P L C control cabinet are arranged on the prying seat, a gas outlet I (2) of the gas-liquid separation system is communicated with the pressurization system, and the gas-liquid separation system and the pressurization system are in electric signal connection with the P L C control cabinet.
2. The integrated flash vapor recovery device according to claim 1, wherein: still be equipped with RTU on the sled seat, RTU communication connection monitored control system.
3. The integrated flash vapor recovery device according to claim 1 or 2, wherein: the gas-liquid separation system comprises a gas-liquid separator and a first gas inlet pipeline (112), wherein a first gas inlet (1) of the gas-liquid separator is communicated with a flash gas incoming pipeline through the first gas inlet pipeline (112), and a liquid level sensor (306) is mounted on the gas-liquid separator;
be equipped with flash distillation gas on the air inlet pipeline (112) and come control valve (102) and manometer one (101), install manometer two (109) on the vapour and liquid separator, air inlet pipeline (112) intercommunication has blow-down pipeline one (113), blow-down pipeline one (113) and blow-down system intercommunication, be equipped with the valve on blow-down pipeline one (113), install pressure transmitter and temperature transmitter on air inlet pipeline one (112), level sensor (306), pressure transmitter one (303) and temperature transmitter one all are connected with P L C switch board and/or RTU electricity.
4. The integrated flash vapor recovery device according to claim 1 or 2, wherein: the supercharging system comprises a compressor (200), a second air inlet pipeline (201) is communicated with a second air inlet (5) of the compressor (200), and a first air outlet (2) of the gas-liquid separation system is communicated with the second air inlet (5) of the compressor (200) through the second air inlet pipeline (201);
two (6) of gas outlet of compressor (200) and handle and communicate through exhaust pipe line (202) between the factory's the raw gas pipe network, exhaust pipe line (202) are gone up and are equipped with pressure transmitter two (309), manometer three (204), check valve (203), flowmeter (308) and electric valve (307) in proper order along gas flow direction, compressor (200), pressure transmitter two (309), flowmeter (308) and electric valve (307) all are connected with P L C switch board and/or RTU electricity.
5. The integrated flash vapor recovery device according to claim 3, wherein: the first air inlet pipeline (112) is also communicated with a supplementary air source pipeline (114), and the communication point of the supplementary air source pipeline (114) and the first air inlet pipeline (112) is positioned between the installation point of the first pressure transmitter (303) and the communication point of the first emptying pipeline (113) and the first air inlet pipeline (112);
and a pressure gauge four (103), a supplementary gas source pipeline ball valve (104), a self-operated regulating valve (301) and an electric ball valve I (302) are sequentially arranged on the supplementary gas source pipeline (114) along the gas flowing direction, and the self-operated regulating valve (301) and the electric ball valve (205) are electrically connected with a P L C control cabinet and/or an RTU.
6. The integrated flash vapor recovery device according to claim 3, wherein: the valve arranged on the first emptying pipeline (113) comprises a first gate valve (105), a safety valve (106) and a second gate valve (107) which are sequentially arranged along the gas flowing direction;
the air inlet pipeline I (112) is also communicated with a vent pipeline II (115), the vent pipeline II (115) is communicated with a vent system, an electric ball valve II (305) and a throttling stop valve (108) are sequentially arranged on the vent pipeline II (115) along the air flowing direction, and the electric ball valve II (305) is electrically connected with a P L C control cabinet and/or an RTU.
7. The integrated flash vapor recovery device according to claim 4, wherein: the exhaust pipeline (202) is communicated with a vent pipeline III (217), the vent pipeline III (217) is communicated with a vent system, a ball valve (205) is arranged on the vent pipeline III (217), and a communication point of the vent pipeline III (217) and the exhaust pipeline (202) is positioned between the flow meter (308) and the check valve (203).
8. The integrated flash vapor recovery device according to claim 3, wherein: an emergency drain outlet (3) and a manual cleaning drain outlet (4) are formed in the bottom of the gas-liquid separator, a drain ball valve (110) is arranged at the emergency drain outlet (3), the manual cleaning drain outlet (4) is communicated with a liquid drainage pipeline (116), a cleaning ball valve (111) is arranged on the liquid drainage pipeline (116), and the liquid drainage pipeline (116) is communicated with a condensate pipeline (9);
compressor (200) drain (8) intercommunication of turbocharging system has blowdown pipeline (218), be equipped with flowing back gate valve (207) on blowdown pipeline (218), blowdown pipeline (218) and condensate oil pipeline (9) intercommunication, be equipped with drain (7) on exhaust pipe line (202) of compressor (200), drain (7) intercommunication has drain line four (219), be equipped with drain gate valve (206) on drain line four (219).
9. The flash gas recovery integrated device according to claim 4, wherein the compressor (200) comprises a first separator (208), a first-stage cylinder (211), a first-stage air-cooled cooler (213), a second separator (209), a second-stage cylinder (212), a second-stage air-cooled cooler (214) and a third separator (210) which are sequentially communicated, a second temperature sensor (310) is installed on a pipeline between a second-stage exhaust port (221) of the second-stage cylinder (212) and the second-stage air-cooled cooler (214), the third separator (210) is communicated with a second air outlet (6) of the compressor (200) through a pipeline, a third pressure transmitter (311) is installed on the pipeline, and the second temperature sensor (310) and the third pressure transmitter (311) are both electrically connected with a P L C control cabinet and/or an RTU.
10. A flash vapor recovery method, which adopts the integrated flash vapor recovery device of claim 5, and is characterized in that: the method comprises the following steps that flash evaporation gas comes from a flash evaporation gas incoming pipeline, enters a gas-liquid separator through a gas inlet pipeline I (112) and a gas inlet I (1) of the gas-liquid separator, is separated to carry heavy hydrocarbon liquid drops, is discharged from a gas outlet I (2) of the gas-liquid separator, enters a compressor (200) of a pressurization system through a gas inlet pipeline II (201) to be pressurized and separated from gas and liquid, is pressurized to 1.8-2.5 MPa through the compressor (200), is discharged to a raw gas pipe network of a treatment plant through a gas outlet II (6) of the pressurization system to be subjected to raw gas recovery, and is discharged to a condensate oil stabilizing device;
when a first pressure transmitter (303) on a first air inlet pipeline (112) detects that the air inlet pressure is smaller than a set lower limit value, a supplementary air source pipeline ball valve (104) on a supplementary air source pipeline (114) is opened, a self-operated regulating valve (301) is opened when reaching the set opening pressure, a P L C control cabinet sends an instruction to open an electric ball valve (302) to supplement natural gas, and when the first pressure transmitter (303) on the first air inlet pipeline (112) detects that the air inlet pressure is larger than the set upper limit value, the P L C control cabinet sends an instruction to close the electric ball valve (302);
when the temperature of flash steam is higher than 135 ℃ or the outlet pressure of the compressor (200) is higher than 2.555MPa after the compressor (200) of the pressurization system is pressurized, the P L C control cabinet or the RTU sends an instruction to stop the compressor (200).
CN202010361750.7A 2020-04-30 2020-04-30 Flash evaporation gas recovery integrated device and recovery method Pending CN111459092A (en)

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Application Number Priority Date Filing Date Title
CN202010361750.7A CN111459092A (en) 2020-04-30 2020-04-30 Flash evaporation gas recovery integrated device and recovery method

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113090948A (en) * 2021-03-30 2021-07-09 中国石油天然气股份有限公司 Pressurizing recovery device for flash evaporation gas in sulfur-containing gas field water
CN115253610A (en) * 2022-07-19 2022-11-01 中煤科工集团沈阳研究院有限公司 Membrane separation nitrogen generator membrane group protection system and liquid level sensor applied by same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113090948A (en) * 2021-03-30 2021-07-09 中国石油天然气股份有限公司 Pressurizing recovery device for flash evaporation gas in sulfur-containing gas field water
CN113090948B (en) * 2021-03-30 2022-06-03 中国石油天然气股份有限公司 Pressurizing recovery device for flash evaporation gas in sulfur-containing gas field water
CN115253610A (en) * 2022-07-19 2022-11-01 中煤科工集团沈阳研究院有限公司 Membrane separation nitrogen generator membrane group protection system and liquid level sensor applied by same

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