CN114017666A - Water bath type natural gas gasification system - Google Patents

Water bath type natural gas gasification system Download PDF

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Publication number
CN114017666A
CN114017666A CN202111298822.9A CN202111298822A CN114017666A CN 114017666 A CN114017666 A CN 114017666A CN 202111298822 A CN202111298822 A CN 202111298822A CN 114017666 A CN114017666 A CN 114017666A
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CN
China
Prior art keywords
natural gas
propane
outlet
circulating
circulating water
Prior art date
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Pending
Application number
CN202111298822.9A
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Chinese (zh)
Inventor
马百通
石磊
秦凤祥
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China Construction Industrial and Energy Engineering Group Co Ltd
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China Construction Industrial and Energy Engineering Group Co Ltd
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Priority to CN202111298822.9A priority Critical patent/CN114017666A/en
Publication of CN114017666A publication Critical patent/CN114017666A/en
Pending legal-status Critical Current

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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
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • 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
    • 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
    • F17C13/10—Arrangements for preventing freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F17C2227/0316—Water heating
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F17C2227/0323—Heat exchange with the fluid by heating using another fluid in a closed loop

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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 provides a water bath type natural gas gasification system, which comprises: the system comprises a circulating working medium evaporator, a circulating working medium condenser and a natural gas superheater; the inlet of the circulating working medium evaporator is connected with a circulating water main pipe, and the outlet of the circulating working medium evaporator is respectively connected with a circulating working medium condenser and a natural gas superheater; the inlet of the circulating working medium condenser is connected with a natural gas high-pressure gasification pump, and the outlet of the circulating working medium condenser is respectively connected with a circulating working medium circulating pump and a natural gas superheater; the outlet of the circulating working medium circulating pump is connected with the circulating working medium evaporator; and the outlet of the natural gas superheater is respectively connected with a natural gas long-distance pipeline and a circulating water main pipe. The invention gasifies the liquefied natural gas by adopting propane, has better gasification effect, and can solve the problems of complex structure, serious icing phenomenon and the like of the traditional gasification device.

Description

Water bath type natural gas gasification system
Technical Field
The invention relates to a natural gas gasification system, in particular to a water bath type natural gas gasification system.
Background
Natural gas is a green and environmentally friendly energy source recognized in the world at present, and natural gas is usually stored in a liquid state, namely Liquefied Natural Gas (LNG), and needs to be gasified before being used, namely gasified Natural Gas (NG).
Currently, there are three general types of large and medium-sized gasification devices: the open rack type gasifier, the intermediate medium gasifier and the immersion type gasifier are difficult to popularize and miniaturize in a large area due to the complex structure or the serious influence of the environmental temperature and huge investment; in contrast, conventional small-sized gasifiers are mainly air-temperature gasifiers, electric-heating gasifiers, steam-heating gasifiers, and the like. The existing market mainly uses an air-temperature type vaporizer which is generally used in summer and is greatly influenced by the environment and has the problem of serious icing phenomenon.
Disclosure of Invention
Aiming at the prior art, the invention provides a water bath type natural gas gasification system to solve the problems of complex structure, serious icing phenomenon and the like of the conventional gasification device.
The invention provides a water bath type natural gas gasification system, which comprises: a propane evaporator, a propane condenser and a natural gas superheater;
the circulating water inlet of the propane evaporator is connected with a circulating water main pipe, the circulating water outlet of the propane evaporator is connected with the circulating water inlet of the natural gas superheater, and the propane outlet of the propane evaporator is connected with the propane condenser; a natural gas inlet of the propane condenser is connected with a natural gas high-pressure gasification pump, a natural gas outlet of the propane condenser is connected with a natural gas inlet of a natural gas superheater, and a propane outlet of the propane condenser is connected with a propane circulating pump; the outlet of the propane circulating pump is connected with the propane inlet of the propane evaporator; the natural gas superheater is characterized in that a circulating water outlet of the natural gas superheater is connected with a circulating water buffer tank, a natural gas outlet of the natural gas superheater is connected with a natural gas long-distance pipeline, an outlet of the circulating water buffer tank is connected with a circulating water circulating pump, and an outlet of the circulating water circulating pump is connected with a circulating water header pipe.
Preferably, a first control valve is arranged at an outlet from the circulating water main pipe to the propane evaporator, and the first control valve and a circulating water outlet of the natural gas superheater are subjected to remote temperature cascade control. So as to ensure the stable temperature of the circulating water outlet of the natural gas superheater.
Preferably, the outlet of the natural gas high-pressure gasification pump is provided with a second control valve, and the second control valve and the natural gas outlet of the natural gas superheater are subjected to remote temperature cascade control. So as to ensure that the natural gas outlet temperature of the natural gas superheater is not lower than 5 ℃.
Preferably, a third control valve is arranged between the inlet and the outlet of the tube side of the propane evaporator. Further guarantee that natural gas superheater's circulating water outlet temperature is stable.
Preferably, a fourth control valve is arranged at an outlet of the propane circulating pump, and the fourth control valve is respectively in cascade control with the liquid level of the liquid accumulation bag of the propane condenser and the remote transmission temperature of the natural gas outlet of the propane condenser. So as to ensure the stable temperature of the liquefied natural gas outlet of the propane condenser.
Preferably, the outlet of the circulating water circulating pump is provided with a fifth control valve.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, propane is used as a circulating medium to gasify the liquefied natural gas, so that a better gasification effect is achieved, heat exchange between the propane and the low-temperature liquefied natural gas can be avoided, the problem that the heat exchange effect is influenced by icing of the outer wall of the heat exchange tube array caused by direct heat exchange between circulating water (below 60 ℃) and the low-temperature liquefied natural gas can be solved, the problems that the existing gasification device is complex in structure, serious in icing phenomenon and the like are solved, the whole system is a closed loop, both the propane and hot water can be recycled, resources are saved, and the cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Wherein, 1, a propane evaporator; 2. a propane condenser; 3. a natural gas superheater; 4. a circulating water main pipe; 5. a natural gas high pressure gasification pump; 6. a propane circulation pump; 7. a circulating water buffer tank; 8. a natural gas long-distance pipeline; 9. a circulating water circulating pump; 10. a first control valve; 11. a second control valve; 12. a third control valve; 13. a fourth control valve; 14. a fifth control valve.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Examples
As shown in fig. 1, a water bath type natural gas gasification system includes: propane evaporator 1, propane condenser 2, natural gas superheater 3, circulating water main pipe 4, natural gas high pressure gasification pump 5, propane circulating pump 6, circulating water buffer tank 7, natural gas long-distance pipeline 8 and circulating water circulating pump 9.
Wherein, the circulating water inlet of the propane evaporator 1 is connected with the circulating water main pipe 4, the circulating water outlet of the propane evaporator 1 is connected with the circulating water inlet of the natural gas superheater 3, and the propane outlet of the propane evaporator 1 is connected with the propane condenser 2. The natural gas inlet of the propane condenser 2 is connected with the natural gas high-pressure gasification pump 5, the natural gas outlet of the propane condenser 2 is connected with the natural gas inlet of the natural gas superheater 3, and the propane outlet of the propane condenser 2 is connected with the propane circulating pump 6. The export of propane circulating pump 6 and the propane entry linkage of propane evaporimeter 1, the circulating water export and the circulating water buffer tank 7 of natural gas over heater 3 are connected, and the natural gas export and the long pipeline 8 of natural gas over heater 3 are connected, and the export and the circulating water circulating pump 9 of circulating water buffer tank 7 are connected, and the export and the circulating water house steward 4 of circulating water circulating pump 9 are connected.
Further, a first control valve 10 is arranged from the circulating water main pipe 4 to the outlet of the propane evaporator 1, and the first control valve 10 and the circulating water outlet of the natural gas superheater 3 are subjected to remote temperature cascade control. The outlet of the natural gas high-pressure gasification pump 5 is provided with a second control valve 11, and the second control valve 11 and the natural gas outlet of the natural gas superheater 5 are subjected to remote temperature cascade control. A third control valve 12 is arranged between the inlet and the outlet of the tube side of the propane evaporator 1. The outlet of the propane circulating pump 6 is provided with a fourth control valve 13, and the fourth control valve 13 is respectively in cascade control with the liquid level of the liquid accumulation bag of the propane condenser 2 and the remote transmission temperature of the natural gas outlet of the propane condenser 2. The outlet of the circulating water circulating pump 9 is provided with a fifth control valve 14.
Propane is adopted as a circulating working medium in the embodiment, hot water with the temperature of below 60 ℃ is adopted as circulating water, propane is heated by the hot water in a propane evaporator 1 to be completely gasified, gasified propane gas is condensed into liquid by liquefied natural gas in a propane condenser 2 to enter a propane circulating pump 6, the liquefied natural gas is heated to the temperature of about minus 43 ℃ from minus 159.4 ℃, and then is further heated to the temperature of above 5 ℃ in a natural gas superheater 3 and enters a natural gas long-distance pipeline 8. The hot water firstly enters the propane evaporator 1 for heat exchange and temperature reduction from the circulating water header pipe 4, then enters the natural gas superheater 3 for further temperature reduction, and finally is cooled to about 30 ℃ and returns to the circulating water header pipe 4 through the circulating water circulating pump 9.
In the whole process, the temperature and the flow of the natural gas and the hot water are accurately controlled, so that the temperature, the pressure and the flow of the working medium in the closed loop circuit can correspondingly fluctuate within a certain range, and the propane circulating pump 5 adopts frequency conversion regulation.
This embodiment adopts propane to gasify liquefied natural gas as the circulation medium, has better gasification effect, propane and low temperature liquefied natural gas heat transfer, can avoid icing because of the heat transfer shell and tube outer wall that circulation water (below 60 ℃) and the direct heat transfer of low temperature liquefied natural gas lead to, influence the problem of heat transfer effect, and then solve current gasification equipment structure complicacy, the serious scheduling problem of icing phenomenon, and entire system is closed loop, propane and the equal cyclic utilization of hot water, resources are saved, and the cost is reduced.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures made by using the contents of the present specification and the drawings can be directly or indirectly applied to other related technical fields, and are within the scope of the present invention.

Claims (6)

1. A water bath natural gas gasification system, comprising: a propane evaporator, a propane condenser and a natural gas superheater;
the circulating water inlet of the propane evaporator is connected with a circulating water main pipe, the circulating water outlet of the propane evaporator is connected with the circulating water inlet of the natural gas superheater, and the propane outlet of the propane evaporator is connected with the propane condenser; a natural gas inlet of the propane condenser is connected with a natural gas high-pressure gasification pump, a natural gas outlet of the propane condenser is connected with a natural gas inlet of a natural gas superheater, and a propane outlet of the propane condenser is connected with a propane circulating pump; the outlet of the propane circulating pump is connected with the propane inlet of the propane evaporator; the natural gas superheater is characterized in that a circulating water outlet of the natural gas superheater is connected with a circulating water buffer tank, a natural gas outlet of the natural gas superheater is connected with a natural gas long-distance pipeline, an outlet of the circulating water buffer tank is connected with a circulating water circulating pump, and an outlet of the circulating water circulating pump is connected with a circulating water header pipe.
2. The water bath type natural gas gasification system of claim 1, wherein a first control valve is arranged at an outlet of the circulating water main pipe to the propane evaporator, and the first control valve is in cascade temperature control with a circulating water outlet of the natural gas superheater.
3. The water bath type natural gas gasification system of claim 1, wherein the outlet of the natural gas high-pressure gasification pump is provided with a second control valve, and the second control valve is in temperature cascade control with the natural gas outlet of the natural gas superheater.
4. The water bath natural gas gasification system of claim 1, wherein a third control valve is disposed between the inlet and the outlet of the propane vaporizer tube side.
5. The water bath type natural gas gasification system of claim 1, wherein the outlet of the propane circulating pump is provided with a fourth control valve, and the fourth control valve is in cascade control with the liquid level of the liquid accumulation bag of the propane condenser and the remote transmission temperature of the natural gas outlet of the propane condenser.
6. The water bath type natural gas gasification system according to claim 1, wherein an outlet of the circulating water circulating pump is provided with a fifth control valve.
CN202111298822.9A 2021-11-04 2021-11-04 Water bath type natural gas gasification system Pending CN114017666A (en)

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CN202111298822.9A CN114017666A (en) 2021-11-04 2021-11-04 Water bath type natural gas gasification system

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Application Number Priority Date Filing Date Title
CN202111298822.9A CN114017666A (en) 2021-11-04 2021-11-04 Water bath type natural gas gasification system

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1334978A (en) * 1971-06-07 1973-10-24 Black Sivalls & Bryson Inc Method of vapourizing a stream of cryogenic fluid
GB1489259A (en) * 1974-01-11 1977-10-19 Sulzer Ag Process and plant for the vaporisation and heating of liquefied natural gas
CN105865149A (en) * 2016-04-22 2016-08-17 暨南大学 Method for producing liquid air by utilizing liquefied natural gas cold energy
CN106870937A (en) * 2015-12-10 2017-06-20 中国石化工程建设有限公司 LNG gasification and TRT and gasification and/or electricity-generating method based on IFV
CN109595461A (en) * 2019-01-15 2019-04-09 江苏科技大学 A kind of LNG is regasified and liquid air preparation system and working method
CN109630877A (en) * 2018-11-14 2019-04-16 江苏科技大学 A kind of LNG regas system and working method
CN109681776A (en) * 2019-01-15 2019-04-26 江苏科技大学 A kind of BOG is re-liquefied to regasify integrated system and working method with LNG
CN110017628A (en) * 2018-01-10 2019-07-16 毛文军 A kind of LNG cold energy use system and method based on argon circulation
CN111121389A (en) * 2019-12-19 2020-05-08 中国大唐集团科学技术研究院有限公司火力发电技术研究院 Liquefied air energy storage and power generation system of deep coupling coal-fired unit

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1334978A (en) * 1971-06-07 1973-10-24 Black Sivalls & Bryson Inc Method of vapourizing a stream of cryogenic fluid
GB1489259A (en) * 1974-01-11 1977-10-19 Sulzer Ag Process and plant for the vaporisation and heating of liquefied natural gas
CN106870937A (en) * 2015-12-10 2017-06-20 中国石化工程建设有限公司 LNG gasification and TRT and gasification and/or electricity-generating method based on IFV
CN105865149A (en) * 2016-04-22 2016-08-17 暨南大学 Method for producing liquid air by utilizing liquefied natural gas cold energy
CN110017628A (en) * 2018-01-10 2019-07-16 毛文军 A kind of LNG cold energy use system and method based on argon circulation
CN109630877A (en) * 2018-11-14 2019-04-16 江苏科技大学 A kind of LNG regas system and working method
CN109595461A (en) * 2019-01-15 2019-04-09 江苏科技大学 A kind of LNG is regasified and liquid air preparation system and working method
CN109681776A (en) * 2019-01-15 2019-04-26 江苏科技大学 A kind of BOG is re-liquefied to regasify integrated system and working method with LNG
CN111121389A (en) * 2019-12-19 2020-05-08 中国大唐集团科学技术研究院有限公司火力发电技术研究院 Liquefied air energy storage and power generation system of deep coupling coal-fired unit

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