CN203248990U - Vapor energy conservation treatment system of LNG receiving station - Google Patents
Vapor energy conservation treatment system of LNG receiving station Download PDFInfo
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- CN203248990U CN203248990U CN 201320204112 CN201320204112U CN203248990U CN 203248990 U CN203248990 U CN 203248990U CN 201320204112 CN201320204112 CN 201320204112 CN 201320204112 U CN201320204112 U CN 201320204112U CN 203248990 U CN203248990 U CN 203248990U
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Abstract
The utility model relates to a vapor energy conservation treatment system of an LNG receiving station, a high pressure natural gas output branch is branched from a high pressure natural gas output pipeline of a natural gas output system existed in the LNG receiving station, the output end of the high pressure natural gas output branch is connected with the input end of a gas-gas ejector mixer, the output end of the gas - gas ejector mixer is connected with the input end of a gas user short distance direct sending pipeline, the gas-gas ejector mixer is provided with a low pressure suction inlet which is connected with the output end of a vapor discharging header pipe of an LNG storage tank, and a vapor flow control valve, regulates the vapor flow according to LNG storage tank pressure condition, is arranged on the vapor discharging header pipe. According to the system provided by the utility model, low pressure vapor discharged by the LNG storage tank can be absorbed by the self-pressure of the output high pressure natural gas, the efficient mixing and energy exchanging of the high pressure natural gas and the low pressure vapor can be accomplished in the gas-gas ejector mixer, and the mixed gas is output, so as to meet the requirement of medium and high pressure natural gas users. The system provided by the utility model is suitable for the treatment of vapor in big and medium LNG receiving stations with different gas state output pressure requirements.
Description
Technical field
The utility model relates to a kind of LNG receiving station boil-off gas processing system, particularly about a kind of boil-off gas energy-efficient treatment system of LNG receiving station that can utilize outer defeated high-pressure natural gas self pressure energy to absorb the low pressure boil-off gas.
Background technique
LNG receiving station is generally bearing reception, the gentle outside the pale of civilization transmission function of storage of LNG.Because LNG(Liquefied Natural Gas, LNG Liquefied natural gas) is cryogen, although LNG equipment has good adiabatic measure, but in the production run process, can produce inevitably a certain amount of BOG(Boiled Off Gas, boil-off gas), along with the continuous increase of BOG quantity, the temperature and pressure in the LNG storage system can raise gradually.If the LNG tank internal pressure is higher than the safety relief pressure of default, will cause storage tank tank deck safety valve to be opened, the BOG that directly releases is to the flare system burning, with the pressure of stable system.This step-down mode of releasing in a large number burning BOG can cause the huge waste of rock gas.Therefore, the BOG processing system is one of problem that necessary emphasis is considered in the LNG receiving station design phase.At present the mode of the treatments B OG of LNG receiving station mainly contains following two kinds: 1, BOG condensation technology again, and BOG is condensed into LNG reclaims, this needs LNG receiving station to keep higher outer defeated traffic demand.2, direct compress technique, the BOG process low pressure compressor in the LNG storage tank and high pressure compressor directly enter multi-purpose station pipeline and deliver to downstream user after being pressurized to successively the required pressure of pipe network transmission.In addition, current increasing LNG receiving station except need to the long defeated pipe network air feed of high pressure, also need to the direct air feed of the Middle Voltage of short-distance and medium-distance, so some LNG receiving stations are divided into high pressure (about 9MPa) with outer defeated rock gas and middle pressure (about 4.0Mpa) is carried, and middle pressure rock gas can be carried after often high-pressure natural gas need being transferred to required middle pressure.This just causes the equipment such as intermediate pressure compressor, high pressure compressor, after-condenser and pressure regulator valve need to be set, and has caused high, the problems such as energy consumption is high, complex operation, complex process of investment, and also has the application restric-tion of operating mode demand.
Summary of the invention
For the problems referred to above, the purpose of this utility model provides the simple boil-off gas energy-efficient treatment system of LNG receiving station of a kind of equipment.
For achieving the above object, the utility model is taked following technological scheme: boil-off gas energy-efficient treatment system of a kind of LNG receiving station, it is characterized in that: the high-pressure natural gas external transport pipeline of its communication system outside the existing rock gas of LNG receiving station is told defeated branch road outside the high-pressure natural gas, the described high-pressure natural gas outward output terminal of defeated branch road is connected with the input end of one gas-gas injection mixer, the output terminal of described gas-gas injection mixer is connected with the input end of natural gas user short distance direct sending pipeline, described gas-gas injection mixer also has the low pressure suction port, described low pressure suction port is connected with the output terminal of the boil-off gas discharge header of LNG storage tank, is provided with the evaporative air control valve of regulating according to LNG pressure of storage tank situation on the described boil-off gas discharge header.
Also be provided with the emergency shutdown valve that guarantees system safety operation and the one-way valve that prevents gas backflow on the above-mentioned boil-off gas discharge header.
Above-mentioned high-pressure natural gas also is provided with the natural gas flow adjustable valve that adjusting enters described gas-gas injection mixer gas discharge on the defeated branch road outward.
Above-mentioned high-pressure natural gas also sets up rock gas defeated bypass outward separately on the defeated branch road outward, the described rock gas outward input end of defeated bypass is connected on described high-pressure natural gas before described gas-gas injection mixer input end outward on the defeated branch road, output terminal is connected on the described natural gas user short distance direct sending pipeline behind described gas-gas injection mixer output terminal, and described rock gas is provided with the bypass air pressure regulator in the defeated bypass outward.
Except above-mentioned high-pressure natural gas external transport pipeline, the outer communication system of described LNG receiving station's rock gas also comprises low pressure pump, knock out drum, high-pressure service pump and vaporizer; Wherein said low pressure delivery side of pump connects the input end of described knock out drum, the output terminal of described knock out drum connects the input end of described high-pressure service pump, described high pressure delivery side of pump connects the input end of described vaporizer, the output terminal of described vaporizer connects the input end of described high-pressure natural gas external transport pipeline, and the output terminal of described high-pressure natural gas external transport pipeline connects the input end of natural gas user long distance pipeline.
The high pressure measurement sled also is set between the input end of the output terminal of above-mentioned high-pressure natural gas external transport pipeline and described natural gas user long distance pipeline; Mesohigh metering sled also is set between the input end of the output terminal of described gas-gas injection mixer and described natural gas user short distance direct sending pipeline.
The utility model is owing to take above technological scheme, it has the following advantages: 1, the high-pressure natural gas external transport pipeline of the utility model communication system outside the existing rock gas of LNG receiving station is told defeated branch road outside the high-pressure natural gas, defeated branch road arranges gas-gas injection mixer outside high-pressure natural gas, the low pressure boil-off gas that abundant mixed high-voltage rock gas and LNG storage tank are discharged in gas-gas injection mixer, thereby utilized outer defeated high-pressure natural gas self pressure energy to absorb the low pressure boil-off gas that the LNG storage tank is discharged, need not to arrange the BOG compressor, after-condenser, pressure regulator valve or BOG low pressure/equipment such as high pressure compressed unit, just can finish boil-off gas and process, it is simple to have equipment, energy consumption is low, the advantage that economic benefit is outstanding.2, the utility model defeated branch road outside high-pressure natural gas sets up defeated bypass outside the rock gas separately, rock gas arranges the bypass air pressure regulator in the defeated bypass outward, when the mixed gas flow of gas-gas injection mixer output can not satisfy the demand of natural gas user, can replenish tolerance to the high-pressure natural gas pressure regulation by the bypass air pressure regulator, the regulation and control flexibility ratio is high, can satisfy different gaseous states defeated pressure demand outward.3, the utility model only need be acquired a small amount of equipment by communication system outside the existing rock gas of LNG receiving station, can realize the energy-efficient treatment of boil-off gas, control does not produce and disturbs and adverse effect to the LNG pressure of storage tank, especially is fit to non-linear, the astable generation of boil-off gas and the actual conditions that effluxes.The utility model can be widely used in the boil-off gas of the large and medium-sized LNG receiving station of different gaseous states defeated pressure requirement outward and process.
Description of drawings
Fig. 1 is the utility model system architecture schematic representation
Embodiment
Below in conjunction with accompanying drawing and example the utility model is described in detail.
The high-pressure natural gas external transport pipeline of the utility model communication system outside the existing rock gas of LNG receiving station is told defeated branch road outside the high-pressure natural gas, defeated branch road arranges gas-gas injection mixer outside high-pressure natural gas, utilize outer defeated high-pressure natural gas self pressure energy to absorb the low pressure boil-off gas of LNG storage tank discharging, and in gas-gas injection mixer, finish fully mixing and energy interchange of high-pressure natural gas and low pressure boil-off gas, mixed gas is the mesohigh rock gas, can be defeated by the mesohigh natural gas user outside natural gas user short distance direct sending pipeline.
As shown in Figure 1, the utility model system composition structure is as follows:
The existing outer communication system of rock gas of LNG receiving station comprises low pressure pump 2, knock out drum 3, high-pressure service pump 4, vaporizer 5 and the high-pressure natural gas external transport pipeline 6 that extracts LNG from LNG storage tank 1.Wherein, the output terminal of low pressure pump 2 connects the input end of knock out drum 3, the output terminal of knock out drum 3 connects the input end of high-pressure service pump 4, the output terminal of high-pressure service pump 4 connects the input end of vaporizer 5, the output terminal of vaporizer 5 connects the input end of high-pressure natural gas external transport pipeline 6, and the output terminal of high-pressure natural gas external transport pipeline 6 connects the input end of natural gas user long distance pipeline 7.The utility model high-pressure natural gas external transport pipeline 6 of communication system outside above-mentioned rock gas is told defeated branch road 9 outside the high-pressure natural gas, the high-pressure natural gas outward output terminal of defeated branch road 9 is connected with the input end 101 of one gas-gas injection mixer 10, the output terminal 102 of gas-gas injection mixer 10 is connected with the input end of natural gas user short distance direct sending pipeline 11, gas-gas injection mixer 10 also has low pressure suction port 103, and low pressure suction port 103 is connected with the output terminal of the boil-off gas discharge header 12 of LNG storage tank 1.Also be provided with evaporative air control valve 13 on the boil-off gas discharge header 12, enter the boil-off gas flow of gas-gas injection mixer 10 by controlling its regulation, realize the pressure control of LNG storage tank 1.
In addition, push back LNG storage tank 1 for preventing high-pressure natural gas, the one-way valve 14 that prevents gas backflow and the emergency shutdown valve 15 that guarantees system safety operation can also be set on the boil-off gas discharge header 12.
High-pressure natural gas can also arrange the natural gas flow adjustable valve 16 of regulating the gas discharge that enters gas-gas injection mixer 10 on the defeated branch road 9 outward.
High-pressure natural gas can also set up rock gas defeated bypass 17 outward separately on the defeated branch road 9 outward, its input end is connected on high-pressure natural gas before gas-gas injection mixer 10 input ends 101 outward on the defeated branch road 6, and output terminal is connected on the natural gas user short distance direct sending pipeline 11 behind gas-gas injection mixer 10 output terminals 102.Rock gas can arrange bypass air pressure regulator 18 in the defeated bypass 17 outward, when the mixed gas flow of gas-gas injection mixer 10 outputs can not satisfy the demand of mesohigh natural gas user, can and replenish tolerance by 18 pairs of high-pressure natural gas pressure regulation of bypass air pressure regulator.
High pressure measurement sled 8 can also be set between the input end of the output terminal of high-pressure natural gas external transport pipeline 6 and natural gas user long distance pipeline 7.Mesohigh metering sled 19 can also be set between the input end of the output terminal of gas-gas injection mixer 10 and natural gas user short distance direct sending pipeline 11.
The core apparatus of gas-gas injection mixer 10 is Venturi tube, and the entrance of Venturi tube connects high-pressure natural gas and fails the output terminal of branch road and the output terminal of boil-off gas discharge header outward.Its working principle is, outer defeated high-pressure natural gas enters gas-gas injection mixer, spray into Venturi tube through nozzle, rock gas flows in the Venturi tube runner, circulation area from large to small, flow velocity increases rapidly, thereby forms negative pressure in the ingress of Venturi tube, and boil-off gas is sucked Venturi tube from the boil-off gas discharge header.Two strands of gases of high-pressure natural gas and boil-off gas mix and energy interchange in the trunnion of Venturi tube, during this time, the speed of high-pressure natural gas reduces, and the speed of boil-off gas increases, and reaches unanimity in the speed of the two strands of gases in trunnion outlet port, fully mix, and when mixed gas passed through the diffusing tube of Venturi tube, along with the increase of runner, speed reduced gradually, kinetic transformation is pressure energy, and mixed gas becomes the mesohigh rock gas.
Describe workflow of the present utility model in detail below in conjunction with a specific embodiment:
Certain LNG receiving station is the rock gas of certain mesohigh natural gas user (such as near plant gas) supply 4.0Mpa.G for the rock gas that certain high-pressure natural gas user supplies 9.0Mpa.G.Receiving station has 3 160,000 side LNG storage tanks, can produce under normal circumstances 5 tons/hour boil-off gas, pressure 0.018Mpa.G, temperature-150 ℃.LNG in the LNG storage tank enters knock out drum and carries out voltage stabilizing after low pressure pump is forced into 1.0Mpa.G, and makes the liquid level in the knock out drum remain on specified altitude assignment, to satisfy the suction requirement of high-pressure service pump.After the LNG that high-pressure service pump is exported knock out drum is forced into 9.2Mpa.G, sends into the vaporizer gasification and be 10 ℃ of temperature, the rock gas of the about 9.0Mpa.G of pressure.Rock gas is divided into two-way output, and one the tunnel is delivered to high pressure measurement through the high-pressure natural gas external transport pipeline prizes, and delivers to the high-pressure natural gas user in metering by the natural gas user long distance pipeline; Another road defeated branch road outside high-pressure natural gas is delivered to gas-gas injection mixer, spray into Venturi tube through nozzle, the boil-off gas of discharging with the LNG storage tank in Venturi tube is mixed and energy interchange, mixed gas becomes the mesohigh rock gas, and the mesohigh rock gas is being delivered to the mesohigh natural gas user by the metering of middle pressure metering sled by natural gas user short distance direct sending pipeline.In the said process, the mixed proportion of high-pressure natural gas and boil-off gas can be 1:4, and the mixed gas of gas-gas injection mixer output is pressure 4.0Mpa.G, the rock gas of temperature-5 ℃.
The various embodiments described above only are used for explanation the utility model; wherein the structure of each parts, Placement etc. all can change to some extent; every equivalents and improvement of carrying out on the basis of technical solutions of the utility model all should do not got rid of outside protection domain of the present utility model.
Claims (10)
1. boil-off gas energy-efficient treatment system of LNG receiving station, it is characterized in that: the high-pressure natural gas external transport pipeline of its communication system outside the existing rock gas of LNG receiving station is told defeated branch road outside the high-pressure natural gas, the described high-pressure natural gas outward output terminal of defeated branch road is connected with the input end of one gas-gas injection mixer, the output terminal of described gas-gas injection mixer is connected with the input end of natural gas user short distance direct sending pipeline, described gas-gas injection mixer also has the low pressure suction port, described low pressure suction port is connected with the output terminal of the boil-off gas discharge header of LNG storage tank, is provided with the evaporative air control valve of regulating according to LNG pressure of storage tank situation on the described boil-off gas discharge header.
2. boil-off gas energy-efficient treatment system of a kind of LNG as claimed in claim 1 receiving station is characterized in that: also be provided with the emergency shutdown valve that guarantees system safety operation and the one-way valve that prevents gas backflow on the described boil-off gas discharge header.
3. boil-off gas energy-efficient treatment system of a kind of LNG as claimed in claim 1 receiving station is characterized in that: described high-pressure natural gas also is provided with on the defeated branch road outward and regulates the natural gas flow adjustable valve that enters described gas-gas injection mixer gas discharge.
4. boil-off gas energy-efficient treatment system of a kind of LNG as claimed in claim 2 receiving station is characterized in that: described high-pressure natural gas also is provided with on the defeated branch road outward and regulates the natural gas flow adjustable valve that enters described gas-gas injection mixer gas discharge.
5. as claimed in claim 1 or 2 or 3 or 4 boil-off gas energy-efficient treatment system of a kind of LNG receiving station, it is characterized in that: described high-pressure natural gas also sets up rock gas defeated bypass outward separately on the defeated branch road outward, the described rock gas outward input end of defeated bypass is connected on described high-pressure natural gas before described gas-gas injection mixer input end outward on the defeated branch road, output terminal is connected on the described natural gas user short distance direct sending pipeline behind described gas-gas injection mixer output terminal, and described rock gas is provided with the bypass air pressure regulator in the defeated bypass outward.
6. as claimed in claim 1 or 2 or 3 or 4 boil-off gas energy-efficient treatment system of a kind of LNG receiving station, it is characterized in that: except described high-pressure natural gas external transport pipeline, the outer communication system of described LNG receiving station's rock gas also comprises low pressure pump, knock out drum, high-pressure service pump and vaporizer; Wherein said low pressure delivery side of pump connects the input end of described knock out drum, the output terminal of described knock out drum connects the input end of described high-pressure service pump, described high pressure delivery side of pump connects the input end of described vaporizer, the output terminal of described vaporizer connects the input end of described high-pressure natural gas external transport pipeline, and the output terminal of described high-pressure natural gas external transport pipeline connects the input end of natural gas user long distance pipeline.
7. boil-off gas energy-efficient treatment system of a kind of LNG as claimed in claim 5 receiving station, it is characterized in that: except described high-pressure natural gas external transport pipeline, the outer communication system of described LNG receiving station's rock gas also comprises low pressure pump, knock out drum, high-pressure service pump and vaporizer; Wherein said low pressure delivery side of pump connects the input end of described knock out drum, the output terminal of described knock out drum connects the input end of described high-pressure service pump, described high pressure delivery side of pump connects the input end of described vaporizer, the output terminal of described vaporizer connects the input end of described high-pressure natural gas external transport pipeline, and the output terminal of described high-pressure natural gas external transport pipeline connects the input end of natural gas user long distance pipeline.
8. such as claim 1 or 2 or 3 or 4 or 7 boil-off gas energy-efficient treatment systems of described a kind of LNG receiving station, it is characterized in that: the high pressure measurement sled also is set between the input end of the output terminal of described high-pressure natural gas external transport pipeline and described natural gas user long distance pipeline; Mesohigh metering sled also is set between the input end of the output terminal of described gas-gas injection mixer and described natural gas user short distance direct sending pipeline.
9. boil-off gas energy-efficient treatment system of a kind of LNG as claimed in claim 5 receiving station is characterized in that: the high pressure measurement sled also is set between the input end of the output terminal of described high-pressure natural gas external transport pipeline and described natural gas user long distance pipeline; Mesohigh metering sled also is set between the input end of the output terminal of described gas-gas injection mixer and described natural gas user short distance direct sending pipeline.
10. boil-off gas energy-efficient treatment system of a kind of LNG as claimed in claim 6 receiving station is characterized in that: the high pressure measurement sled also is set between the input end of the output terminal of described high-pressure natural gas external transport pipeline and described natural gas user long distance pipeline; Mesohigh metering sled also is set between the input end of the output terminal of described gas-gas injection mixer and described natural gas user short distance direct sending pipeline.
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| CN 201320204112 CN203248990U (en) | 2013-04-22 | 2013-04-22 | Vapor energy conservation treatment system of LNG receiving station |
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| CN 201320204112 CN203248990U (en) | 2013-04-22 | 2013-04-22 | Vapor energy conservation treatment system of LNG receiving station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103225739A (en) * | 2013-04-22 | 2013-07-31 | 中国海洋石油总公司 | Energy-saving processing system for vapor of LNG receiving station |
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- 2013-04-22 CN CN 201320204112 patent/CN203248990U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103225739A (en) * | 2013-04-22 | 2013-07-31 | 中国海洋石油总公司 | Energy-saving processing system for vapor of LNG receiving station |
| CN103225739B (en) * | 2013-04-22 | 2015-09-09 | 中国海洋石油总公司 | A kind of LNG receiving station boil-off gas energy-efficient treatment system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131023 Effective date of abandoning: 20150909 |
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| RGAV | Abandon patent right to avoid regrant |