CN112082088A - System and method for recovering residual liquid in loading and unloading of liquefied hydrocarbon - Google Patents
System and method for recovering residual liquid in loading and unloading of liquefied hydrocarbon Download PDFInfo
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- CN112082088A CN112082088A CN201910506031.7A CN201910506031A CN112082088A CN 112082088 A CN112082088 A CN 112082088A CN 201910506031 A CN201910506031 A CN 201910506031A CN 112082088 A CN112082088 A CN 112082088A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/002—Details of vessels or of the filling or discharging of vessels for vessels under pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/03—Dealing with losses
- F17C2260/035—Dealing with losses of fluid
- F17C2260/036—Avoiding leaks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/04—Reducing risks and environmental impact
- F17C2260/042—Reducing risk of explosion
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to the safety field of dangerous chemical loading and unloading operation, and discloses a liquefied hydrocarbon loading and unloading residual liquid recovery system and a recovery method, wherein the recovery system comprises: the absorption device is connected with a pipeline between the crane pipe end ball valve and the tank car end ball valve, and the control device is used for controlling the opening and closing of the absorption unit to enable the gasified hydrocarbon to enter another absorption unit or enable the gasified hydrocarbon in the absorption unit to enter the recovery device when the pressure of the gasified hydrocarbon in the absorption unit reaches a certain preset value; a recovery device for recovering the gasified hydrocarbons in the absorption unit. The invention can realize safe and effective recovery of the liquefied hydrocarbon residual liquid in the loading and unloading operation process.
Description
Technical Field
The invention relates to the field of safety of loading and unloading operations of hazardous chemicals, in particular to a system and a method for recovering residual liquid in loading and unloading of liquefied hydrocarbon.
Background
The liquefied hydrocarbon can be used as an important chemical raw material for cracking and preparing ethylene, propylene and butylene, and can also be used as fuel, and the main transportation mode is transportation by an automobile tank truck. When the liquefied hydrocarbon tank truck loads and unloads the vehicle, the loading and unloading crane pipe and the liquefied hydrocarbon transportation tank truck are connected together through the quick connecting joint to carry out loading and unloading operation. After the liquefied hydrocarbon loading and unloading are finished, the crane pipe end and the tank car end ball valve are closed and opened, and as the conveying pressure of the liquefied hydrocarbon is about 1.6MPa, the pressurized liquefied hydrocarbon medium between the two ball valves needs to be discharged when the liquid phase quick joint is separated, otherwise, the pipeline is subjected to pressure building, and the quick joint cannot be separated.
The petrochemical industry enterprises design fire code 5.4.4 stipulates that liquefied hydrocarbon railways and automobile loading and unloading facilities strictly prohibit the on-site discharge of liquefied hydrocarbon; the temporary method for safety of handling operation of combustible liquid and liquefied hydrocarbon vehicles stipulates that an oil gas recovery facility should be arranged in a liquefied hydrocarbon handling system to prevent oil gas from volatilizing and leaking; GB50160-2008 'petrochemical industry enterprise design fire protection code' stipulates that liquefied hydrocarbon is A-type substances, and once encountering an ignition source after leakage, the liquefied hydrocarbon can cause explosion. Liquefied hydrocarbon loading and unloading trestles of some refinery enterprises are not provided with liquefied hydrocarbon gas recovery devices, liquefied hydrocarbon media stored in pipelines are discharged on site through bypass ball valves at the ends of tank cars, and are settled at the bottoms of the loading and unloading trestles to form an explosion environment.
Disclosure of Invention
The invention aims to solve the problem that the liquefied hydrocarbon residual liquid between a crane pipe end and a ball valve at the end of a tank car is discharged in situ during the separation of the conventional quick connector, and provides a liquefied hydrocarbon loading and unloading residual liquid recovery system and a recovery method.
In order to achieve the above object, the present invention provides a liquefied hydrocarbon loading and unloading residue recovery system, wherein the system comprises: absorbing device, this absorbing device links to each other with the pipeline between crane pipe end ball valve and the tank car end ball valve, includes: an absorption unit for providing a gasification environment for the liquefied hydrocarbon in the pipeline and absorbing the gasified hydrocarbon; a pressure monitoring unit for monitoring the pressure in the absorption unit; the control device is used for controlling the opening and closing of the absorption unit to enable the gasified hydrocarbon to enter another absorption unit or enable the gasified hydrocarbon in the absorption unit to enter the recovery device when the pressure of the gasified hydrocarbon in the absorption unit reaches a certain preset value; a recovery apparatus for recovering the vaporized hydrocarbons in the absorption unit, comprising: a storage unit for storing the recovered liquefied hydrocarbons; a circulation unit for circulating the liquefied hydrocarbon in the storage unit; an injection unit forming a closed loop circulation system with the storage unit and the circulation unit for pumping the vaporized hydrocarbons within the absorption unit.
Optionally, the control device includes: a switch unit and a control unit; a switch unit for controlling whether to turn on the absorption unit; and the control unit is used for controlling the switch unit.
Optionally, the absorption unit comprises: the device comprises a first absorption unit and a second absorption unit, wherein the first absorption unit is connected with the second absorption unit.
Optionally, the switch unit includes: the first switch unit is arranged on the inlet ends of the first absorption unit and the second absorption unit; and a second switch unit installed on the outlet ends of the first and second absorption units.
Optionally, the control unit includes: the first control unit is used for controlling the opening and closing of the first switch unit to be switched to another absorption unit to continuously absorb the gasified hydrocarbon when the monitored pressure in one absorption unit reaches a certain preset value; or the second control unit is used for controlling the opening and closing of the second switch unit to enable the gasified hydrocarbon in the absorption unit to enter the recovery device when the pressure in the absorption unit reaches a certain preset value according to the monitoring.
Optionally, the recycling system further includes: and the external transportation device is used for transporting the liquefied hydrocarbon in the storage unit to the tank truck when the liquefied hydrocarbon in the storage unit reaches a storage liquid level.
Optionally, the pressure monitoring unit is a pressure transmitter.
Optionally, the circulation unit is a centrifugal pump.
Optionally, the injection unit is an injector.
Optionally, the first switch unit and the second switch unit are both solenoid valves.
The invention also provides a method for recovering the loading and unloading residual liquid of the liquefied hydrocarbon, which comprises the following steps: absorbing and gasifying liquefied hydrocarbons; monitoring the pressure within the absorption cell; controlling the opening and closing of the absorption units when the pressure in the absorption units reaches a certain preset value according to the monitored pressure in the absorption units, so that the gasified hydrocarbon enters another absorption unit or the gasified hydrocarbon in the absorption units enters a recovery device; and recovering the vaporized hydrocarbons in the absorption unit.
Optionally, the method further includes: the liquefied hydrocarbons in the storage unit are transported to a tanker truck.
Through the technical scheme, the liquefied hydrocarbon residual liquid between the crane pipe end and the tank car end ball valve in the loading and unloading operation process is effectively absorbed through the absorption device, when the pressure of gasified hydrocarbon generated in the absorption device reaches a certain preset value, a closed loop system is formed among the storage unit, the circulating unit and the injection unit in the recovery device, in the circulating process that the circulating unit sucks and extrudes the liquefied hydrocarbon in the storage unit, the injection unit forms certain negative pressure by utilizing the Venturi principle, and the gasified hydrocarbon in the absorption unit is sucked into the recovery device and absorbed by utilizing the negative pressure, so that the safe and effective recovery of the liquefied hydrocarbon residual liquid is realized.
Drawings
FIG. 1 is a schematic diagram of a configuration of a liquefied hydrocarbon loading and unloading raffinate recovery system according to one embodiment of the present invention;
FIG. 2 is a block diagram of a liquefied hydrocarbon loading and unloading raffinate recovery system according to an embodiment of the present invention;
FIG. 3 is a flow chart of a process for recovering a liquefied hydrocarbon loading and unloading residue according to an embodiment of the present invention.
Description of the reference numerals
1. Absorption device 2 and control device
3. Recovery device 4 and external conveying device
10. Absorption unit 11 and pressure monitoring unit
30. Storage unit 31 and circulation unit
32. Injection unit 100 and first absorption tank
101. Second canister 102, pipeline
110. First pressure transmitter 111 and second pressure transmitter
200. First solenoid valve 201, second solenoid valve
210. Third solenoid valve 211, fourth solenoid valve
300. Residual liquid tank 310, centrifugal pump
320. Injector 400 and external delivery pump
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
FIG. 1 is a schematic diagram of a liquefied hydrocarbon loading and unloading raffinate recovery system according to an embodiment of the present invention. As shown in FIG. 1, the present invention provides a liquefied hydrocarbon loading and unloading raffinate recovery system comprising: absorbing device 1, this absorbing device 1 links to each other with the pipeline between crane pipe end ball valve and the tank car end ball valve, can include: an absorption unit 10 for providing a gasification environment for the liquefied hydrocarbon in the pipeline and absorbing the gasified hydrocarbon; a pressure monitoring unit 11 for monitoring the pressure inside the absorption unit 10; the control device 2 is used for controlling the opening and closing of the absorption unit 10 to enable the gasified hydrocarbon to enter another absorption unit or enable the gasified hydrocarbon in the absorption unit to enter the recovery device when the pressure in the absorption unit 10 reaches a certain preset value; and a recovery device 3 for recovering the gasified hydrocarbons in the absorption unit, including: a storage unit 30 for storing the recovered liquefied hydrocarbons; a circulation unit 31 for circulating the liquefied hydrocarbon in the storage unit 30; an injection unit 32 forming a closed loop circulation system with the storage unit 30 and the circulation unit 31 for pumping the gasified hydrocarbons in the absorption unit 10. The recovery system can effectively absorb the liquefied hydrocarbon residual liquid between the crane pipe end and the tank car end ball valve in the loading and unloading operation process through the absorption device, when the pressure of the gasified hydrocarbon generated in the absorption device reaches a certain preset value, a closed-loop system is formed among the storage unit, the circulating unit and the injection unit in the recovery device, in the circulating process that the circulating unit sucks and extrudes the liquefied hydrocarbon in the storage unit, the injection unit forms certain negative pressure by utilizing the Venturi principle, and the gasified hydrocarbon in the absorption unit is sucked into the recovery device and absorbed by utilizing the negative pressure, so that the safe and effective recovery of the liquefied hydrocarbon residual liquid is realized.
Preferably, the absorption unit includes: a first absorption unit and a second absorption unit, one end of the pipeline 102 is connected with a side branch ball valve at the pipeline between the end of the crane and the end of the tank car where the liquid hydrocarbon is left, and the other end is connected with the first absorption unit and the second absorption unit. Wherein the first absorption unit is connected with the second absorption unit, and the pipe 102 may be a corrugated hose. The pressure monitoring unit 11 is a pressure transmitter, and as shown in fig. 2, may include: a first pressure transmitter 110 mounted on the first absorption unit; and a second pressure transmitter 111 mounted on the second absorption unit. The first absorption unit and the second absorption unit may be a first absorption tank 100 and a second absorption tank 101, respectively (the first absorption tank 100 and the second absorption tank 101 may have the same volume, and may be 3 cubic meters, for example). Of course, the present invention is not limited to the case where the volumes of the first absorption tank 100 and the second absorption tank 101 are equal to each other, and the volumes of the first absorption tank 100 and the second absorption tank 101 may be different from each other; for the arrangement in which the volumes of the first absorption tank 100 and the second absorption tank 101 are equal, the volumes are not limited to 3 cubic meters, and other suitable sizes are also applicable.
The control device includes: a switch unit and a control unit; a switch unit for controlling whether to turn on the absorption unit; and the control unit is used for controlling the switch unit.
The switching unit includes: and the first switch unit is arranged on the inlet ends of the first absorption unit and the second absorption unit. The control unit comprises a first control unit and a second control unit, and the first control unit is used for controlling the first switch unit; the first control unit is used for controlling the opening and closing of the first switch unit to be switched to another absorption unit to continuously absorb the gasified hydrocarbon when the monitored pressure in one absorption unit reaches a certain preset value. As shown in fig. 2, the first control unit controls the first switching unit such that the first absorption unit stops absorbing the gasified hydrocarbons and controls the first switching unit such that the second absorption unit starts absorbing the gasified hydrocarbons when the pressure in the first absorption unit reaches a certain preset value; or when the pressure in the second absorption unit reaches a certain preset value, controlling the first switching unit so that the second absorption unit stops absorbing the gasified hydrocarbons, and controlling the first switching unit so that the first absorption unit starts absorbing the gasified hydrocarbons. Specifically, as shown in fig. 2, the first switching unit may be a first solenoid valve 200 and a second solenoid valve 201, respectively, and controls the first absorption tank 100 to stop absorbing gasified hydrocarbons when the pressure in the first absorption tank 100 reaches a certain preset value, for example, the first absorption tank 100 may be controlled to stop absorbing gasified hydrocarbons by controlling the first solenoid valve 200 disposed at the inlet end of the first absorption tank 100 to close; meanwhile, the second electromagnetic valve 201 is controlled to be opened, and the second absorption tank 101 starts to absorb the gasified hydrocarbons; alternatively, when the pressure in the second canister 101 reaches a certain preset value, the second canister 101 is controlled to stop absorbing the gasified hydrocarbons, for example, by controlling the second electromagnetic valve 201 disposed at the inlet end of the second canister 101 to close to control the second canister 101 to stop absorbing the gasified hydrocarbons; meanwhile, the first solenoid valve 200 is controlled to be opened, and the first absorption tank 100 starts to absorb the gasified hydrocarbons, and the following process is similar to the above process and will not be described herein. It can be seen that the recovery system can automatically switch the electromagnetic valves of the two absorption tanks to ensure that the gasified hydrocarbon is absorbed by one absorption tank and simultaneously the gasified hydrocarbon can be absorbed by the other absorption tank to perform pressurized liquefaction, and the arrangement can continuously recover a large amount of liquefied hydrocarbon.
The switching unit includes: and the second switch unit is arranged on the outlet ends of the first absorption unit and the second absorption unit. And the second control unit is used for controlling the second switch unit, and controlling the second switch unit to be opened and closed when the pressure in the absorption unit reaches a certain preset value according to the monitored pressure, so that the gasified hydrocarbon in the absorption unit enters the recovery device. As shown in fig. 2, the first control unit controls the first switching unit such that the first absorption unit stops absorbing the gasified hydrocarbons and controls the first switching unit such that the second absorption unit starts absorbing the gasified hydrocarbons when the pressure in the first absorption unit reaches a certain preset value; or when the pressure in the second absorption unit reaches a certain preset value, controlling the first switching unit so that the second absorption unit stops absorbing the gasified hydrocarbons, and controlling the first switching unit so that the first absorption unit starts absorbing the gasified hydrocarbons. Specifically, as shown in fig. 2, the second switching unit may be a third solenoid valve 210 and a fourth solenoid valve 211, respectively, and control the first absorption tank 100 to release the absorbed gasified hydrocarbon when the pressure in the first absorption tank 100 reaches a predetermined value, for example, the third solenoid valve 210 disposed at the outlet end of the first absorption tank 100 may be controlled to be opened to control the first absorption tank 100 to release the absorbed gasified hydrocarbon; alternatively, when the pressure in the second canister 101 reaches a certain preset value, the second canister 101 is controlled to release the absorbed gasified hydrocarbons, for example, the fourth electromagnetic valve 211 arranged at the outlet end of the second canister 101 is controlled to be opened to control the second canister 101 to release the absorbed gasified hydrocarbons; the following is similar to the above process and will not be described herein. Therefore, the recovery system can automatically switch the electromagnetic valves of the two absorption tanks to ensure that the gasified hydrocarbons absorbed in one absorption tank can be continuously released after the gasified hydrocarbons absorbed by the other absorption tank are completely released, and the continuous operation of the recovery process is ensured.
As shown in fig. 2, the recovery device 3 includes: a storage unit 30, a circulation unit 31 and an injection unit 32, forming a closed loop circulation system with the storage unit and the circulation unit for pumping the gasified hydrocarbons in the absorption unit. Specifically, the storage unit is a residual liquid tank 300, the circulation unit is a centrifugal pump 310, the injection unit is an injector 320, the centrifugal pump 310 is started to circulate the liquefied hydrocarbon in the residual liquid tank 300, the centrifugal pump 310 and the injector 320 form a closed loop system, when the pressure in the first absorption tank 100 reaches a certain preset value in the circulation process of sucking and extruding the liquefied hydrocarbon in the residual liquid tank 300 by the centrifugal pump 310, the third electromagnetic valve 210 is opened, the injector 320 forms a certain negative pressure by using the venturi principle, the gasified hydrocarbon in the first absorption tank 100 is sucked into the injector 320, the pressure of the gasified hydrocarbon is increased by a diffuser of the injector 320 and then is carried out in the residual liquid tank 300 together with the circulation liquid, and the gasified hydrocarbon is changed into the liquefied hydrocarbon again; or, in the circulating process of sucking and extruding the liquefied hydrocarbon in the residual liquid tank 300 by the centrifugal pump 310, when the pressure in the second absorption tank 101 reaches a certain preset value, the fourth electromagnetic valve 211 is opened, the ejector 320 forms a certain negative pressure by using the venturi principle, the gasified hydrocarbon in the second absorption tank 101 is sucked into the ejector 320, the pressure is increased by the pressure-expanding pipe of the ejector 320, and the gasified hydrocarbon and the circulating liquid are carried into the residual liquid tank 300 together, so that the gasified hydrocarbon is changed into the liquefied hydrocarbon again. Therefore, the recovery system can automatically switch the electromagnetic valves of the two absorption tanks to ensure that the gasified hydrocarbons in one absorption tank can be continuously absorbed after the gasified hydrocarbons are completely absorbed by the other absorption tank, and the continuous recovery process is ensured.
The control units may include a general purpose processor, a special purpose processor, a conventional processor, a Digital Signal Processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) circuits, any other type of Integrated Circuit (IC), a state machine, or the like.
The recycling device 3 may be a residue tank 300, and the residue tank 300 may include a storage tank of various shapes, as shown in fig. 2.
As the recovery process proceeds such that the gasified hydrocarbons in the absorption unit are continuously sucked into the recovery device, the liquid level of the liquefied hydrocarbons in the storage unit 30 is continuously raised, and therefore, the recovery system for liquefied hydrocarbons provided by the present invention may further include: and the output device 4 is used for outputting the liquefied hydrocarbon to the tank truck when the liquid level of the liquefied hydrocarbon in the storage unit 30 reaches a storage liquid level. The external transportation device 4 may include an external transportation pump 400, which may be disposed at a preset height of a storage liquid level in the storage unit 30, as shown in fig. 2, and controls the external transportation pump 400 to be turned on to output the liquefied hydrocarbons only when the liquid level of the liquefied hydrocarbons reaches the preset height, thereby completing the liquefied hydrocarbon recovery operation.
FIG. 3 is a flow diagram of a process for recovering a liquefied hydrocarbon loading raffinate in accordance with one embodiment of the present invention. As shown in FIG. 3, the present invention provides a method for recovering a liquefied hydrocarbon loading/unloading residue comprising: absorbing and gasifying liquefied hydrocarbons; monitoring the pressure within the absorption cell; controlling the opening and closing of the absorption units when the pressure in the absorption units reaches a certain preset value according to the monitored pressure in the absorption units, so that the gasified hydrocarbon enters another absorption unit or the gasified hydrocarbon in the absorption units enters a recovery device; and storing the recovered liquefied hydrocarbons.
Optionally, the method further includes: the liquefied hydrocarbons in the storage unit are transported to a tanker truck.
Specifically, the recovery system composed of the first absorption tank 100, the second absorption tank 101, the first pressure transmitter 110, the second pressure transmitter 111, the residual liquid tank 300, the centrifugal pump 310, the ejector 320 and the control device is used as an example to explain the recovery process for liquefied hydrocarbons provided by the present invention, as shown in fig. 2.
After the liquefied hydrocarbon loading and unloading operation is completed, the two ball valves at the crane pipe end and the tanker end are closed, the ball valve at the side branch of the crane pipe end and the electromagnetic valve are opened, and the liquefied hydrocarbon is gasified and rapidly enters the pipeline 102 once the electromagnetic valve is opened because the air pressure difference between the two sides of the electromagnetic valve is about 1.6MPa (the pipeline between the crane pipe end and the tanker end where the liquid hydrocarbon is left has a certain air pressure, and the pipeline 102 has almost no air pressure of about 0.03 MPa).
With the first solenoid valve 200 opened, the gasified hydrocarbon rapidly enters the first absorption tank 100 through the pipe 102, and since air does not exist in the first absorption tank 100, there is no risk of gas explosion when the gasified hydrocarbon enters the first absorption tank 100. The pressure of the gasified hydrocarbon in the first absorption tank 100 is gradually increased along with the continuous charging of the gasified hydrocarbon, and when the first pressure transmitter 110 monitors that the pressure value reaches a preset pressure (for example, 1.3MPa), the control device controls the first electromagnetic valve 200 to be closed and the second electromagnetic valve 201 to be opened, so that the gasified hydrocarbon is charged into the second absorption tank 101; and in the circulating process that the centrifugal pump 310 is started to suck and extrude the liquefied hydrocarbon in the residual liquid tank 300, the centrifugal pump 310 and the ejector 320 form a closed loop system, the third electromagnetic valve 210 is opened, the ejector 320 sucks the gasified hydrocarbon in the first absorption tank 100 into the ejector 320 by utilizing the negative pressure formed by the Venturi principle, the gasified hydrocarbon is subjected to pressure increase by the pressure expanding pipe of the ejector 320 and then is carried out in the residual liquid tank 300 together with the circulating liquid, and the gasified hydrocarbon is changed into the liquefied hydrocarbon again. As the process proceeds, the pressure of the gasified hydrocarbon in the first absorption tank 100 becomes lower and lower, and when the pressure drops to 0.03MPa, the control device controls the third electromagnetic valve 210 to be closed.
The pressure of the gasified hydrocarbon in the second absorption tank 101 is increased as the gasified hydrocarbon is continuously charged into the second absorption tank 101, and when the pressure of the gasified hydrocarbon in the second absorption tank 101 reaches the preset pressure (for example, 1.3MPa), the control device controls the second electromagnetic valve 201 to be closed and the first electromagnetic valve 200 to be opened so as to charge the gasified hydrocarbon into the first absorption tank 100; and in the circulating process that the centrifugal pump 310 is started to suck and extrude the liquefied hydrocarbon in the residual liquid tank 300, the centrifugal pump 310 and the ejector 320 form a closed loop system, the fourth electromagnetic valve 211 is opened, the ejector 320 sucks the gasified hydrocarbon in the second absorption tank 101 into the ejector 320 by utilizing the negative pressure formed by the Venturi principle, the gasified hydrocarbon is subjected to pressure boosting through the pressure-expanding pipe of the ejector 320 and is carried out in the residual liquid tank 300 together with the circulating liquid, and the gasified hydrocarbon is changed into the liquefied hydrocarbon again. As the process proceeds, the pressure of the gasified hydrocarbons in the second canister 101 becomes lower and lower, and when the pressure falls to 0.03MPa, the control device controls the fourth electromagnetic valve 211 to close.
As the pressurization liquefaction process proceeds, the liquid level of the liquefied hydrocarbon in the residual liquid tank 300 gradually rises, and when the liquid level reaches a preset height, the control device controls the external delivery pump 400 to be turned on, and the liquefied hydrocarbon is delivered to the tank truck to complete the recovery operation of the liquefied hydrocarbon.
The recovery system provided by the invention can automatically switch the electromagnetic valves of the two absorption tanks to ensure that gasified hydrocarbon can be output through the other absorption tank while being absorbed by one absorption tank, a closed loop system is formed among the storage unit, the circulating unit and the injection unit in the recovery device, the injection unit forms certain negative pressure by using a Venturi principle in the circulating process of sucking and extruding the liquefied hydrocarbon in the storage unit by the circulating unit, and the gasified hydrocarbon in the absorption unit is sucked into the recovery device and absorbed by using the negative pressure, so that the problem of local discharge of the liquefied hydrocarbon during separation of a quick connector is effectively solved, the burning and explosion accidents of the gasified hydrocarbon can be avoided, and the safe and effective recovery of the liquefied hydrocarbon is realized.
Of course, the present embodiment is not limited to the above-mentioned case where the preset pressure is 1.3MPa, and may be set according to the case of a specific canister.
In summary, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for efficiently absorbing a liquefied hydrocarbon residue between a loading/unloading end and a ball valve of a tank truck during a loading/unloading operation by an absorption device, which can efficiently recover the liquefied hydrocarbon residue by pressurizing and liquefying the gasified hydrocarbon into liquefied hydrocarbon by a pressurizing device and recovering the liquefied hydrocarbon to a storage device when the pressure of the gasified hydrocarbon generated by gasification in the absorption device reaches a predetermined pressure.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (9)
1. A liquefied hydrocarbon loading and unloading raffinate recovery system, comprising:
absorbing device, this absorbing device links to each other with the pipeline between crane pipe end ball valve and the tank car end ball valve, includes:
an absorption unit for providing a gasification environment for the liquefied hydrocarbon in the pipeline and absorbing the gasified hydrocarbon;
a pressure monitoring unit for monitoring the pressure in the absorption unit;
the control device is used for controlling the opening and closing of the absorption unit to enable the gasified hydrocarbon to enter another absorption unit or enable the gasified hydrocarbon in the absorption unit to enter the recovery device when the pressure of the gasified hydrocarbon in the absorption unit reaches a certain preset value;
a recovery apparatus for recovering the vaporized hydrocarbons in the absorption unit, comprising:
a storage unit for storing the recovered liquefied hydrocarbons;
a circulation unit for circulating the liquefied hydrocarbon in the storage unit;
an injection unit forming a closed loop circulation system with the storage unit and the circulation unit for pumping the vaporized hydrocarbons within the absorption unit.
2. The liquefied hydrocarbon loading and unloading raffinate recovery system as claimed in claim 1, wherein said control means includes: a switch unit and a control unit;
a switch unit for controlling whether to turn on the absorption unit;
and the control unit is used for controlling the switch unit.
3. The liquefied hydrocarbon loading and unloading raffinate recovery system according to claim 2, wherein said absorption unit comprises: the device comprises a first absorption unit and a second absorption unit, wherein the first absorption unit is connected with the second absorption unit;
preferably, the switching unit includes: the first switch unit is arranged on the inlet ends of the first absorption unit and the second absorption unit; and a second switch unit installed on the outlet ends of the first and second absorption units.
4. The liquefied hydrocarbon loading and unloading raffinate recovery system according to claim 3, wherein said control unit includes:
the first control unit is used for controlling the opening and closing of the first switch unit to be switched to another absorption unit to continuously absorb the gasified hydrocarbon when the monitored pressure in one absorption unit reaches a certain preset value; or
And the second control unit is used for controlling the opening and closing of the second switch unit to enable the gasified hydrocarbon in the absorption unit to enter the recovery device when the pressure in the absorption unit reaches a certain preset value according to the monitoring.
5. The liquefied hydrocarbon loading and unloading raffinate recovery system as claimed in claim 1, wherein said recovery system further comprises:
and the external transportation device is used for transporting the liquefied hydrocarbon in the storage unit to the tank truck when the liquefied hydrocarbon in the storage unit reaches a storage liquid level.
6. The liquefied hydrocarbon loading and unloading residue recovery system according to any one of claims 1 to 5, wherein said pressure monitoring unit is a pressure transmitter;
preferably, the circulation unit is a centrifugal pump;
preferably, the injection unit is an injector.
7. The liquefied hydrocarbon loading and unloading residue recovery system according to any one of claims 1 to 5, wherein said first switching unit and said second switching unit are both solenoid valves.
8. A process for recovering a liquefied hydrocarbon loading raffinate, the process comprising:
absorbing and gasifying liquefied hydrocarbons;
monitoring the pressure within the absorption cell;
controlling the opening and closing of the absorption units when the pressure in the absorption units reaches a certain preset value according to the monitored pressure in the absorption units, so that the gasified hydrocarbon enters another absorption unit or the gasified hydrocarbon in the absorption units enters a recovery device; and recovering the vaporized hydrocarbons in the absorption unit.
9. The liquefied hydrocarbon loading and unloading raffinate recovery method as claimed in claim 8, further comprising:
and conveying the liquefied hydrocarbon in the recovery device to a tank truck.
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