CN112046686B - Ethane transport ship non-liquefiable high-methane-content volatile gas treatment system - Google Patents
Ethane transport ship non-liquefiable high-methane-content volatile gas treatment system Download PDFInfo
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- CN112046686B CN112046686B CN202010765551.2A CN202010765551A CN112046686B CN 112046686 B CN112046686 B CN 112046686B CN 202010765551 A CN202010765551 A CN 202010765551A CN 112046686 B CN112046686 B CN 112046686B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
- B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
- B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
- B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
- B63B25/14—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed pressurised
Abstract
The invention relates to a non-liquefiable high-methane-content volatile gas processing system for an ethane transport ship, which belongs to the technical field of ship engineering equipment and comprises a processing system, wherein the processing system comprises: the system comprises a cargo hold, a first gas-liquid separator, a cargo compressor, a reliquefaction device, a second gas-liquid separator, a pressure control three-way valve, a high-pressure compressor, a high-pressure gas storage tank, an aftercooler, a first pressure sensor, a second pressure sensor, a pressure reducing valve, a pressure regulating valve and a heater; the top of cargo hold is provided with volatilize the gas collecting pipe, volatilize the gas collecting pipe and be connected with first vapour and liquid separator, and first vapour and liquid separator connects the goods compressor, and the liquefaction device is connected again to the goods compressor, and the second vapour and liquid separator is connected to the liquefaction device again, and the cargo hold is connected to second vapour and liquid separator bottom. The invention solves the problems that in the prior art, an ethane reliquefaction device cannot liquefy high-content methane gas, and the methane gas is burnt, so that resources are wasted and the environment is damaged, and has simple integral configuration and strong practicability.
Description
Technical Field
The invention belongs to the technical field of ship engineering equipment, and particularly relates to a non-liquefiable high-methane-content volatile gas treatment system for an ethane transport ship.
Background
The natural gas is a novel energy source for replacing coal and petroleum by the characteristics of cleanness, convenience and high heat value, and the proportion of the natural gas in the global energy consumption structure is higher and higher. The demand for natural gas is increasing, thereby facilitating the exploitation of shale gas. Ethane is used as an accessory product in the shale gas exploitation process, the yield of the ethane is greatly increased along with the increase of the exploitation amount of the shale gas, the price of the ethane is low at present, and the ethane has a huge cost advantage when being used for cracking ethylene in the petrochemical industry. The yield is increased, the demand is vigorous, and under the common excitation of the supply and demand relationship, large ships specially used for transporting ethane are produced.
Because the ethane cargo contains a certain amount of methane, the boiling point of ethane is-88.6 deg.c, while the boiling point of methane is only-161.5 deg.c. Therefore, when the external heat is strongly transferred to the cargo hold, the methane is further gasified. Thus, although the liquid ethane contains a relatively small amount of methane (generally not more than 0.8 mol%), the content in the volatile gases is very high, reaching 30% to 50%. The existing ethane reliquefaction devices cannot liquefy methane gas with such high content. The gas is sent to a gas combustion device for treatment, the methane escapes due to insufficient combustion, so that the environment is damaged, and meanwhile, the gas combustion device also consumes a large amount of electric energy (a fan) and fuel (diesel oil) during operation. Methane is consumed as a clean energy source.
Disclosure of Invention
In order to solve the technical problems, the invention provides a system for processing high-methane-content volatile gas which cannot be liquefied by an ethane transport ship, which aims to solve the problems that in the prior art, an ethane reliquefaction device cannot liquefy high-content methane gas, and resources are wasted and the environment is damaged when the methane gas is combusted, and the technical purpose of the invention is realized by the following technical scheme:
a high methane content boil-off gas processing system that is not liquefiable by an ethane carrier, the processing system comprising: the device comprises a cargo hold, a first gas-liquid separator, a cargo compressor, a reliquefaction device, a second gas-liquid separator, a pressure control three-way valve, a high-pressure compressor, a high-pressure gas storage tank, an after-cooler, a first pressure sensor, a second pressure sensor, a pressure reducing valve, a pressure regulating valve and a heater;
the cargo compartment is characterized in that a volatile gas collecting pipe is arranged at the top of the cargo compartment and connected with a first gas-liquid separator, the first gas-liquid separator is connected with a cargo compressor, the cargo compressor is connected with a reliquefaction device, the reliquefaction device is connected with a second gas-liquid separator, the bottom of the second gas-liquid separator is connected with the cargo compartment, the top of the second gas-liquid separator is connected with a pressure control three-way valve, one path of the pressure control three-way valve is connected with the cargo compartment, the other path of the pressure control three-way valve is connected with a high-pressure compressor, the high-pressure compressor is connected with a high-pressure gas storage tank, a aftercooler is respectively connected with the high-pressure compressor and the high-pressure gas storage tank, the aftercooler is arranged between the high-pressure compressor and the high-pressure gas storage tank, a first pressure sensor is arranged at the top of the second gas-liquid separator, and a second pressure sensor is arranged on the high-pressure compressor;
one end of the pressure control three-way valve is connected with the pressure reducing valve, the other end of the pressure control three-way valve is connected with the pressure regulating valve, and the pressure regulating valve is connected with the heater.
Furthermore, the bottom of the first gas-liquid separator is connected with a first gas-liquid separator return pipeline, a first check valve is arranged in the middle of the first gas-liquid separator return pipeline, and the first gas-liquid separator return pipeline is connected with the cargo hold.
Furthermore, the pressure reducing valve is connected with a gas return cargo hold pipeline, a second check valve is arranged between the gas return cargo hold pipeline and the pressure reducing valve, and a third check valve and a liquefied ethane return cargo hold pipeline are connected between the second gas-liquid separator and the cargo hold.
Further, the high-pressure gas storage tanks are in container type modular design, four high-pressure gas storage tanks are installed in the module, high-pressure hoses are connected between the high-pressure gas storage tanks, and safety valves are arranged on the module.
Further, the first check valve, the second check valve and the third check valve are all pendulum check valves, and are all vertically installed.
Furthermore, the pressure control three-way valve, the pressure reducing valve and the pressure regulating valve are all pneumatic control valves.
Furthermore, the heater adopts glycol water as a heating medium, and the safety valve is a spring type safety valve.
Furthermore, the high-pressure compressor is a normal-temperature and high-pressure piston compressor, is driven by an explosion-proof motor and is controlled in a variable-frequency mode.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention monitors the pressure in the second gas-liquid separator by the pressure sensor arranged at the top of the second gas-liquid separator, and when the pressure is lower (the quantity of non-liquefiable gas is less). At the moment, the outlet of the second gas-liquid separator is communicated with the pressure reducing valve by controlling the three-way valve, after the gas is reduced in pressure by the pressure reducing valve (the temperature is correspondingly reduced), the pressure is reduced to be slightly higher than the pressure of the cargo hold, and the gas flows back to the bottom of the cargo hold under the action of the pressure difference, so that the time for regasification of methane is prolonged. When the pressure in the second gas-liquid separator rises, a large amount of gas is accumulated, and if the second gas-liquid separator continues to return to the cargo hold, the large amount of gas can heat the cargo in the cargo hold, so that the evaporation capacity is increased sharply. At the moment, the control three-way valve is communicated with the pressure regulating valve, the gas is led to the heater, and the heated gas is boosted by the high-pressure compressor and then stored in the high-pressure gas storage tank. The high-pressure air storage tank can be replaced at the wharf regularly.
2. The system has simple structure and reliable operation, and different processing flows are selected according to the load change, thereby ensuring the economy and high efficiency of the system; the high-pressure compressor controlled by frequency conversion is adopted, so that the economical efficiency of the system is further improved; the pressure of the gas is adjusted by the pressure reducing valve and the pressure adjusting valve, and the high-pressure gas storage tank is protected by the safety valve, so that the safety of the system is improved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the processing system of the present invention.
In the figure, 1, a cargo hold; 2. a volatile gas collection pipeline; 3. a first gas-liquid separator; 4. a first check valve; 5. a first gas-liquid separator return pipeline; 6. a cargo compressor; 7. a reliquefaction device; 8. a second gas-liquid separator; 9. a first pressure sensor; 10. a pressure control three-way valve; 11. a pressure reducing valve; 12. a second check valve; 13. returning the gas to the cargo tank pipeline; 14. a pressure regulating valve; 15. a heater; 16. a high pressure compressor; 17. an after cooler; 18. a second pressure sensor; 19. a high pressure gas storage tank; 20. a safety valve; 21. a third check valve; 22. liquefied ethane returns to the tank pipeline; 23. a high pressure hose.
Detailed Description
The technical scheme of the invention is further described by combining the specific embodiments as follows:
a high methane content volatile gas processing system that is not liquefiable by an ethane-transporting vessel, as shown in fig. 1, comprising a processing system comprising: the system comprises a cargo hold 1, a first gas-liquid separator 3, a cargo compressor 6, a reliquefaction device 7, a second gas-liquid separator 8, a pressure control three-way valve 10, a high-pressure compressor 16, a high-pressure gas storage tank 19, an aftercooler 17, a first pressure sensor 9, a second pressure sensor 18, a pressure reducing valve 11, a pressure regulating valve 14 and a heater 15.
The top of cargo hold 1 is provided with the volatile gas collecting pipe, and the volatile gas collecting pipe is connected with first gas-liquid separator 3, and cargo compressor 6 is connected at 3 tops of first gas-liquid separator, and 3 bottoms of first gas-liquid separator are connected with first gas-liquid separator and return cabin pipeline 5, and first gas-liquid separator 3 returns the cabin pipeline 5 intermediate position with first gas-liquid separator and is equipped with first check valve 4, and first gas-liquid separator returns cabin pipeline 5 and is connected with cargo hold 1.
The cargo compressor 6 is connected with the reliquefaction device 7, the reliquefaction device 7 is connected with the second gas-liquid separator 8, the bottom of the second gas-liquid separator 8 is connected with the cargo hold 1, the top of the second gas-liquid separator 8 is connected with the pressure control three-way valve 10, one path of the pressure control three-way valve 10 is connected with the cargo hold 1, the other path of the pressure control three-way valve 10 is connected with the high-pressure compressor 16, and the high-pressure compressor 16 adopts a normal-temperature high-pressure piston compressor, an explosion-proof motor and frequency conversion control. The high-pressure compressor 16 is connected with high-pressure gas storage tanks 19, the high-pressure gas storage tanks 19 are in a container type modular design, four high-pressure gas storage tanks 19 are installed in a module, high-pressure hoses 23 are connected between the high-pressure gas storage tanks 19, spring type safety valves 20 are arranged on the module to prevent the high-pressure gas storage tanks 19 from being in overpressure, and if the high-pressure gas storage tanks 19 are in overpressure, the safety valves 20 are opened to release pressure to be discharged from the ventilation mast. The aftercooler 17 is respectively connected with the high-pressure compressor 16 and the high-pressure gas storage tank 19, the aftercooler 17 is arranged between the high-pressure compressor 16 and the high-pressure gas storage tank 19, the first pressure sensor 9 is installed at the top of the second gas-liquid separator 8, the first pressure sensor 9 is used for monitoring the pressure inside the second gas-liquid separator 8, and one end (o) of the pressure control three-way valve 10 is connected with the upper end of the second gas-liquid separator 8; the second pressure sensor 18 is installed on the high pressure compressor 16, and the second pressure sensor 18 controls the rotating speed of the high pressure compressor 16 through frequency conversion according to the monitored outlet pressure of the high pressure compressor 16, so as to ensure that the pressure of the outlet gas is kept at the set pressure. The first check valve 4, the second check valve 12, and the third check valve 21 are all pendulum check valves, and are all vertically installed, preventing the medium from flowing backward.
One end (a) of a pressure control three-way valve 10 is connected with a pressure reducing valve 11, the pressure reducing valve 11 is connected with a gas return cargo tank pipeline 13, a second check valve 12 is arranged between the gas return cargo tank pipeline 13 and the pressure reducing valve 11, and a third check valve 21 and a liquefied ethane return cargo tank pipeline 22 are connected between a second gas-liquid separator 8 and the cargo tank 1; the other end (b) of the pressure control three-way valve 10 is connected with a pressure regulating valve 14, the pressure regulating valve 14 is connected with a heater 15, and the heater 15 adopts glycol water as a heating medium to prevent the heating medium from freezing due to too low gas temperature. The aftercooler 17 uses fresh water as a cooling medium to cool the high pressure gas to ambient temperature. The pressure control three-way valve 10, the pressure reducing valve 11 and the pressure regulating valve 14 are all pneumatic control valves, and the pneumatic control valves refer to various pneumatic elements which control the pressure, flow and flow direction of air flow in a pneumatic system and ensure the normal work of pneumatic executive elements or mechanisms. The element that controls and regulates the pressure of the compressed air is called a pressure control valve.
The specific working process is as follows:
step 1: the volatile gas generated in the cargo hold 1 is collected by the volatile gas collecting pipe and then enters the first gas-liquid separator 3, and the separated liquid returns to the cargo hold 1 through the first check valve 4 and the first gas-liquid separator return pipeline 5. The separated gas is pressurized by the cargo compressor 6 and then enters the reliquefaction device 7, and the liquefied ethane and the non-liquefied gas mixture enter the second gas-liquid separator 8 for re-separation.
And 2, step: the liquid separated in the second gas-liquid separator 8 is returned to the cargo tank 1 through the liquefied ethane return line 22 via the third check valve 21. The gas collected in the upper part of the second gas-liquid separator 8 is led out through a top pipeline thereof by a pressure control three-way valve 10. A first pressure sensor 9 installed at the top of the second gas-liquid separator 8 monitors the pressure inside the second gas-liquid separator 8 to control the connection direction of a pressure control three-way valve 10.
And step 3: when it is detected that the pressure inside the second gas-liquid separator 8 is low, the three-way valve 10 is controlled by the pressure (o → a connection), and the gas is decompressed by the pressure-reducing valve 11 by the pressure difference, and then returned to the cargo tank pipe 13 and to the bottom of the cargo tank 1.
And 4, step 4: when the pressure inside the second gas-liquid separator 8 is detected to be high, the three-way valve 10 is controlled by the pressure (o → b is connected), the gas passes through the pressure regulating valve 14, the smooth gas flow is ensured to be sent to the heater 15 to be heated to the inlet temperature required by the high-pressure compressor 16, and the outlet of the high-pressure compressor 16 is provided with a second pressure sensor 18 for monitoring the gas outlet pressure so as to control the rotating speed of the high-pressure compressor 16. The pressurized gas, after having been heated up, is cooled by the aftercooler 17 and then injected into the high-pressure gas tank 19.
And 5: when the ship is parked at a dock regularly, the high-pressure quick connection hose can be removed, the high-pressure gas storage tank 19 module is integrally removed, and a new module is replaced for storing the high-methane gas which cannot be liquefied in the next voyage. The gas in the replacement module (methane + ethane) can be used as fuel for onshore use.
The present invention is further explained and not limited by the embodiments, and those skilled in the art can make various modifications as necessary after reading the present specification, but all the embodiments are protected by the patent law within the scope of the claims.
Claims (8)
1. A system for processing a high methane content boil-off gas that is not liquefiable by an ethane transport vessel, the system comprising: the system comprises a cargo hold, a first gas-liquid separator, a cargo compressor, a reliquefaction device, a second gas-liquid separator, a pressure control three-way valve, a high-pressure compressor, a high-pressure gas storage tank, an aftercooler, a first pressure sensor, a second pressure sensor, a pressure reducing valve, a pressure regulating valve and a heater; the cargo compartment is characterized in that a volatile gas collecting pipe is arranged at the top of the cargo compartment and connected with a first gas-liquid separator, the first gas-liquid separator is connected with a cargo compressor, the cargo compressor is connected with a reliquefaction device, the reliquefaction device is connected with a second gas-liquid separator, the bottom of the second gas-liquid separator is connected with the cargo compartment, the top of the second gas-liquid separator is connected with a pressure control three-way valve, one path of the pressure control three-way valve is connected with the cargo compartment, the other path of the pressure control three-way valve is connected with a high-pressure compressor, the high-pressure compressor is connected with a high-pressure gas storage tank, a aftercooler is respectively connected with the high-pressure compressor and the high-pressure gas storage tank and is arranged between the high-pressure compressor and the high-pressure gas storage tank, a first pressure sensor is arranged at the top of the second gas-liquid separator, and a second pressure sensor is arranged on the high-pressure compressor; one end of the pressure control three-way valve, which is connected with the cargo hold, is connected with a pressure reducing valve, one end of the pressure control three-way valve, which is connected with the high-pressure compressor, is connected with a pressure regulating valve, and the pressure regulating valve is connected with a heater; the first pressure sensor monitors the pressure in the second gas-liquid separator to control the connection direction of the pressure control three-way valve; when the monitored pressure in the second gas-liquid separator is lower, the second gas-liquid separator is communicated with the cargo hold; and when the monitored high pressure inside the second gas-liquid separator is detected, the second gas-liquid separator is communicated with the high-pressure compressor.
2. The non-liquefiable high-methane-content volatile gas treatment system of the ethane transport ship according to claim 1, wherein a first gas-liquid separator hold-back pipeline is connected to the bottom of the first gas-liquid separator, a first check valve is arranged in the middle of the first gas-liquid separator hold-back pipeline, and the first gas-liquid separator hold-back pipeline is connected with the cargo hold.
3. The system for processing the high-methane-content volatile gas which cannot be liquefied by an ethane transport ship according to claim 2, wherein the pressure reducing valve is connected with a gas return cargo tank pipeline, a second check valve is arranged between the gas return cargo tank pipeline and the pressure reducing valve, and a third check valve and a liquefied ethane return cargo tank pipeline are connected between the second gas-liquid separator and the cargo tank.
4. The system of claim 3, wherein the high pressure gas storage tanks are of a container type modular design, four high pressure gas storage tanks are mounted in a module, a high pressure hose is connected between the high pressure gas storage tanks, and a safety valve is arranged on the module.
5. The ethane carrier non-liquefiable high methane content volatile gas processing system of claim 4 wherein the first check valve, the second check valve and the third check valve are pendulum check valves and are all vertically mounted.
6. The system for processing the high-methane-content volatile gas which cannot be liquefied by an ethane transport ship according to claim 5, wherein the pressure control three-way valve, the pressure reducing valve and the pressure regulating valve are all pneumatic control valves.
7. The ethane carrier non-liquefiable high methane content volatile gas processing system of claim 6, wherein the heater uses glycol water as a heating medium, and the safety valve is a spring-type safety valve.
8. The non-liquefiable high-methane-content volatile gas processing system of claim 7, wherein the high-pressure compressor is a normal-temperature high-pressure piston compressor, and is driven by an explosion-proof motor and controlled by frequency conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010765551.2A CN112046686B (en) | 2020-08-03 | 2020-08-03 | Ethane transport ship non-liquefiable high-methane-content volatile gas treatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010765551.2A CN112046686B (en) | 2020-08-03 | 2020-08-03 | Ethane transport ship non-liquefiable high-methane-content volatile gas treatment system |
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| CN112046686A CN112046686A (en) | 2020-12-08 |
| CN112046686B true CN112046686B (en) | 2022-12-13 |
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| CN202010765551.2A Active CN112046686B (en) | 2020-08-03 | 2020-08-03 | Ethane transport ship non-liquefiable high-methane-content volatile gas treatment system |
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| CN114379715A (en) * | 2021-12-06 | 2022-04-22 | 沪东中华造船(集团)有限公司 | Ship cabin pressure control system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2016169837A (en) * | 2015-03-13 | 2016-09-23 | 三井造船株式会社 | Boil-off gas recovery system |
| CN108137133A (en) * | 2015-11-05 | 2018-06-08 | 现代重工业株式会社 | Gas handling system and the ship for including it |
| CN108883817A (en) * | 2016-03-31 | 2018-11-23 | 大宇造船海洋株式会社 | The re-liquefied device and method of the boil-off gas of ship |
| CN109703700A (en) * | 2012-10-24 | 2019-05-03 | 大宇造船海洋株式会社 | Liquefaction gas processing system for ship |
| CN110248866A (en) * | 2017-01-24 | 2019-09-17 | 大宇造船海洋株式会社 | System and method for supplying fuel in Liquefied Natural Gas fuel ship |
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- 2020-08-03 CN CN202010765551.2A patent/CN112046686B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109703700A (en) * | 2012-10-24 | 2019-05-03 | 大宇造船海洋株式会社 | Liquefaction gas processing system for ship |
| JP2016169837A (en) * | 2015-03-13 | 2016-09-23 | 三井造船株式会社 | Boil-off gas recovery system |
| CN108137133A (en) * | 2015-11-05 | 2018-06-08 | 现代重工业株式会社 | Gas handling system and the ship for including it |
| CN108883817A (en) * | 2016-03-31 | 2018-11-23 | 大宇造船海洋株式会社 | The re-liquefied device and method of the boil-off gas of ship |
| CN110248866A (en) * | 2017-01-24 | 2019-09-17 | 大宇造船海洋株式会社 | System and method for supplying fuel in Liquefied Natural Gas fuel ship |
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