CN210374297U - BOG cold energy utilization system for natural gas liquefaction storage base - Google Patents

BOG cold energy utilization system for natural gas liquefaction storage base Download PDF

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CN210374297U
CN210374297U CN201920944340.8U CN201920944340U CN210374297U CN 210374297 U CN210374297 U CN 210374297U CN 201920944340 U CN201920944340 U CN 201920944340U CN 210374297 U CN210374297 U CN 210374297U
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control valve
natural gas
bog
heat exchanger
pump
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CN201920944340.8U
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李艳杰
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Wuhan Gas & Heat Planning And Design Institute Co ltd
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Wuhan Gas & Heat Planning And Design Institute Co ltd
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Abstract

The utility model relates to a BOG cold energy utilization system for natural gas liquefaction storage base, including BOG storage tank and heat exchanger, the BOG storage tank is connected with pump one through first control valve, pump one through the side access connection of second control valve with the heat exchanger, the side export of heat exchanger is connected with natural gas liquefaction storage base self-service gas system through the third control valve, the import of heat exchanger secondary side is connected with the heat transfer medium source through the fourth control valve, the export of heat exchanger secondary side is connected with pump two through the fifth control valve, pump two is connected with natural gas liquefaction storage base air conditioning refrigeration equipment through the sixth control valve. The utility model is used for the gaseous cold energy of BOG of liquefied natural gas storage base utilizes, the utility model discloses simple structure, safe and reliable.

Description

BOG cold energy utilization system for natural gas liquefaction storage base
Technical Field
The utility model relates to a BOG cold energy utilization system for natural gas liquefaction storage base.
Background
The small-sized LNG (liquefied natural gas) gasification station is generally a small-sized station self-built and self-used by enterprises or factories, and the principle of the small-sized LNG gasification station is that liquid natural gas in a storage tank is pressurized or automatically flows into an air-temperature gasifier through a storage tank supercharger to be gasified, pressure-regulated, metered and odorized, and then is changed into gaseous natural gas to enter a natural gas pipeline to be used by a boiler or a production line in a plant area. In the gasification process, the cold energy released by the LNG is directly discharged to the air, which not only causes a great deal of waste of cold energy, but also forms a great deal of cold mist to influence the surrounding environment of the gasifier. If this part of the cold energy can be utilized, it will bring great economic benefits, and in view of the current LNG cold energy utilization method, the LNG cold energy is generally used in large LNG stations, and is not suitable for small LNG vaporization stations. The small LNG gasification station is used for cooling of summer air conditioners of factory office buildings in an ideal mode for LNG cold energy application at present, and the mode can relieve the phenomenon of shortage of power consumption of summer air conditioners in peak periods, save energy and bring economic benefits.
Disclosure of Invention
The utility model aims to solve the problem that a BOG cold energy utilization system for natural gas liquefaction stores base is provided, and this system is used for the BOG's of natural gas liquefaction stores base cold energy to utilize, not only can alleviate summer air conditioner peak period power consumption nervous phenomenon, can also the energy saving, brings economic benefits.
The utility model provides a technical scheme is: the utility model provides a BOG cold energy utilization system for natural gas liquefaction storage base, including BOG storage tank and heat exchanger, the BOG storage tank is connected with pump one through first control valve, pump one is through the side access connection of second control valve with the heat exchanger once, the side export of once of heat exchanger is connected with natural gas liquefaction storage base is from gas system through the third control valve, the heat exchanger secondary side import is connected with the heat transfer medium source through the fourth control valve, the heat exchanger secondary side export is connected with pump two through the fifth control valve, the pump is connected with natural gas liquefaction storage base air conditioner refrigeration equipment through the sixth control valve.
The heat exchanger is a BOG and ethylene glycol liquid heat exchanger and is used for utilizing BOG cold energy. The heat exchange medium in the heat exchange medium source is glycol aqueous liquid. The ethylene glycol aqueous solution is adopted, so that the chemical corrosion to metal equipment and pipelines is relatively small; in the secondary heat exchange process, the secondary refrigerant is a glycol aqueous solution without phase change, and cannot be frozen due to the phenomenon of instantaneous ultralow temperature as the brine. And the BOG system, the pump, the self-gas-using system and the heat exchange system are provided with control valves for controlling each link.
The glycol water solution, the heat exchange system and the air-conditioning refrigeration system are provided with control valves for controlling each link.
The utility model discloses the installation is used for BOG to store back technology, when needs maintenance, interruption refrigeration or handling accident, turns off control flap is whole, then handles the operation. The utility model discloses simple structure, safe and reliable.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
Referring to fig. 1, the utility model discloses a BOG storage tank 9, pump one (BOG pump) 10, BOG/ethylene glycol aqueous solution heat exchanger 7 and natural gas liquefaction storage base air conditioning refrigeration equipment (indoor air conditioning refrigeration equipment) 13, BOG storage tank 9 is connected with BOG pump 10 through first control valve 1, BOG pump 10 is through second control valve 2 and BOG/ethylene glycol aqueous solution heat exchanger 7 one side import connection, BOG after the heat transfer is exported through the one side of BOG/ethylene glycol aqueous solution heat exchanger 7 and is connected with indoor self-service gas system (natural gas liquefaction storage base self-service gas system) 11 through third control valve 3, a gas supply source for indoor self-service gas; a secondary side inlet of the BOG/ethylene glycol water solution heat exchanger 7 is connected with a cold medium source 12 through a fourth control valve 4; the outlet of the secondary side of the BOG/glycol aqueous solution heat exchanger 7 is connected with a second pump (glycol pump) 6 through a fifth control valve 5; the glycol pump 6 is connected with the indoor air conditioning refrigeration equipment 13 through the sixth control valve 8, and glycol liquid absorbing BOG cold energy is used for air conditioning refrigeration in summer of the indoor office building. BOG (flash steam) generated in the unloading process and the storage process of the storage tank in the liquefied natural gas storage base is stored by the BOG storage tank and then is utilized by cold energy of ethylene glycol, and the ethylene glycol absorbs the BOG cold energy and is used for refrigerating an air conditioner in the storage base in summer. The gasification amount in the LNG gasification station is determined according to the gas consumption of the terminal, the demand reaches the peak in winter, and the office building in the station needs refrigeration only in summer, so that a mode of connecting a newly-built heat exchange system in parallel with the original process system of the gasification station is generally adopted. The utility model is used for the gaseous cold energy of BOG of liquefied natural gas storage base utilizes, the utility model discloses simple structure, safe and reliable.
The utility model discloses a control valve accessible manual control realizes opening or closing, also can realize automatic operation through the automatic control mode. The utility model discloses BOG cold energy in the small-size natural gas liquefaction storage base of specially adapted utilizes to office building cold load is measured and calculated for 327.6kW, and when adopting ordinary domestic air conditioner cooling, the refrigerated COP of air conditioner is about 3.0, and then office building every hour air conditioner power consumption in summer is 327.6kW 3600s/3.0=393 MJ. The electricity consumption of 1 degree is about 3.6MJ, and the average electricity consumption of the office building in summer is 9h multiplied by 393/3.6 MJ =982 degrees. When LNG is used for cooling in summer, the power consumption is only the power consumed by the R404a pump and the ethylene glycol pump, the power of each pump is 3kW, the power factor is generally 0.8, and the daily average power consumption of the office building in summer is 9 hX (2X 3 kW)/0.8=67.5kWh =67.5 degrees. When using LNG to carry out summer cooling, the electric quantity that can practice thrift every day is 982-67.5=914.5 degrees, and the price of electricity is calculated according to national commercial power consumption, about 1 yuan/degree, then practices thrift electric charge 914.5 yuan/day, if summer cooling time calculates according to 90 days, then annual saving air conditioner refrigeration electric charge 914.5 yuan/day x 90 days =92305 yuan, consequently the utility model discloses simple structure, safe and reliable, energy-conserving benefit is showing.

Claims (2)

1. A BOG cold energy utilization system for a natural gas liquefaction storage base, comprising: the BOG storage tank is connected with the first pump through the first control valve, the first pump is connected with a primary side inlet of the heat exchanger through the second control valve, a primary side outlet of the heat exchanger is connected with a natural gas liquefied storage base self-gas system through the third control valve, a secondary side inlet of the heat exchanger is connected with a heat exchange medium source through the fourth control valve, a secondary side outlet of the heat exchanger is connected with the second pump through the fifth control valve, and the pump is connected with natural gas liquefied storage base air conditioning refrigeration equipment through the sixth control valve.
2. The BOG cold energy utilization system for natural gas liquefaction storage sites of claim 1, wherein: the heat exchange medium in the heat exchange medium source is glycol aqueous liquid.
CN201920944340.8U 2019-06-21 2019-06-21 BOG cold energy utilization system for natural gas liquefaction storage base Active CN210374297U (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111344528A (en) * 2017-11-21 2020-06-26 乔治洛德方法研究和开发液化空气有限公司 BOG recondenser and LNG supply system provided with same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111344528A (en) * 2017-11-21 2020-06-26 乔治洛德方法研究和开发液化空气有限公司 BOG recondenser and LNG supply system provided with same
CN111344528B (en) * 2017-11-21 2022-02-01 乔治洛德方法研究和开发液化空气有限公司 BOG recondenser and LNG supply system provided with same

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