CN112460485A - LNG liquefaction cold energy distribution method - Google Patents
LNG liquefaction cold energy distribution method Download PDFInfo
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- CN112460485A CN112460485A CN202011369907.7A CN202011369907A CN112460485A CN 112460485 A CN112460485 A CN 112460485A CN 202011369907 A CN202011369907 A CN 202011369907A CN 112460485 A CN112460485 A CN 112460485A
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- cold energy
- condenser
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
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- 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
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Abstract
The invention relates to the technical field of LNG (liquefied natural gas), in particular to a LNG liquefied cold energy distribution method, which comprises a natural gas storage tank, a security condenser, a cold energy recovery tower, a condenser, a reboiler, a reheater, an air temperature type vaporizer, a temperature transmitter and a chilled water storage tank, wherein the natural gas storage tank is connected with the security condenser; the cold energy recovery tower comprises a condenser and a reboiler, the natural gas storage tank is communicated with the condenser, and liquefied natural gas is discharged out of the cold energy recovery tower for users to use after being heated and gasified by a heat exchange medium in the condenser; and a security condenser is arranged between the natural gas storage tank and the cold energy recovery tower. The device adopts the cold energy of intermediate medium heat transfer medium when with liquefied natural gas gasification to be used for preparing the refrigerated water, has reduced a large amount of power consumption that mechanical refrigeration caused, carries out the sled dress to whole cold energy recovery unit, adopts DCS to retrieve the sled simultaneously and controls, more is fit for using widely.
Description
Technical Field
The invention relates to the technical field of LNG (liquefied natural gas), in particular to a LNG liquefied cold energy distribution method.
Background
Since the 21 st century, the price of petroleum rises worldwide, the energy and power costs are greatly increased, and under the form of rapid development of Chinese economy, energy conservation and energy utilization rate improvement are all too slow. LNG, which is a liquid mixture of low temperature (-162 c) obtained by deacidifying and dehydrating low-pollution natural gas and freezing and liquefying the low-pollution natural gas through a low-temperature process, has a density increased by about 600 times to facilitate long-distance transportation, has been favored by countries all over the world, and thus has rapidly developed the LNG industry (20% growth rate every year). The power and utility consumption per ton of LNG produced is about 850 kw.h, and LNG is generally used after being vaporized by a vaporizer at an LNG receiving station, and a large amount of cold is released during vaporization, which has a value of about 830kJ/kg, and this cold includes latent heat of vaporization of liquid natural gas and sensible heat of rewarming gaseous natural gas from a storage temperature to an ambient temperature. If the liquefied natural gas is directly evaporated in the environment, the heat of the environment is absorbed and the temperature is raised, so that not only can the cold energy carried by the LNG be wasted uselessly, but also the environment can be polluted;
with the shortage of global petroleum resources and the continuously intensified environmental pollution, the natural gas with small pollution, good combustion performance and abundant reserves is more and more widely applied, and the recycling of the LNG cold energy has a very good development prospect.
Disclosure of Invention
In order to solve the problems, the invention designs an LNG liquefaction cold energy distribution method.
In order to achieve the technical purpose and achieve the technical effects, the invention is realized by the following technical scheme:
a LNG liquefaction cold energy distribution method comprises a natural gas storage tank, a security condenser, a cold energy recovery tower, a condenser, a reboiler, a reheater, an air-temperature vaporizer, a temperature transmitter and a chilled water storage tank;
the cold energy recovery tower comprises a condenser and a reboiler, the natural gas storage tank is communicated with the condenser, and liquefied natural gas is discharged out of the cold energy recovery tower for users to use after being heated and gasified by a heat exchange medium in the condenser; a security condenser is arranged between the natural gas storage tank and the cold energy recovery tower, the natural gas storage tank is communicated with the security condenser through a pipeline, a stop valve, an emergency cut-off valve and a regulating valve, a heat exchange medium feeding pipe orifice of the security condenser is communicated with the top of the cold energy recovery tower, an LNG discharging pipe of the security condenser is communicated with the condenser, a heat exchange medium discharging pipe orifice of the security condenser is communicated with a reboiler, the chilled water storage tank is communicated with the reboiler through a pump, the chilled water is discharged out of the cold energy recovery tower after being cooled by a heat exchange medium in the reboiler and flows back to the chilled water storage tank for circulating cooling, the heat exchange medium in the reboiler exchanges heat with the chilled water, is heated and gasified and then enters the condenser again to exchange heat with the liquefied natural gas, a reheater is arranged between the cold energy recovery tower and the chilled water storage tank, and an LNG outlet pipeline of the cold energy recovery, a chilled water outlet pipeline of the cold energy recovery tower is communicated with the heat release process of the reheater; the liquefied natural gas discharged from the cold energy recovery tower is further heated by the reheater to meet the gas demand of users, and the chilled water discharged from the cold energy recovery tower is further cooled by the reheater and then flows back into the chilled water storage tank;
the cold energy recovery tower is respectively provided with a liquefied natural gas transmitter, a heat exchange medium transmitter and a heat exchange medium temperature transmitter, the liquid level transmitter is respectively in control linkage with an LNG feeding pipeline regulating valve and a chilled water pump, and the LNG discharging pipeline at the top of the cold energy recovery tower is provided with a pressure transmitter and a temperature transmitter and is in control linkage with the pipeline regulating valve;
still include air temperature formula vaporizer, the natural gas storage tank is linked together through pipeline, stop valve, quick action emergency valve and governing valve and air temperature formula vaporizer, the natural gas outlet pipeline of reheater and air temperature formula vaporizer sets up temperature transmitter respectively.
Preferably, the security condenser is provided with a safety regulating device for regulating the pressure of the heat exchange medium and controlling the temperature of the heat exchange medium.
Preferably, the chilled water storage tank is provided with a chilled water using system and a water replenishing system.
Preferably, the chilled water storage tank is provided with a liquid level transmitter and a temperature transmitter II which are respectively linked with the chilled water pump in a control way.
The invention has the beneficial effects that:
the device adopts the cold energy of intermediate medium heat transfer medium when with liquefied natural gas gasification to be used for preparing the refrigerated water, has reduced a large amount of power consumption that mechanical refrigeration caused, has considerable economy and social, adopts novel, efficient cold energy recovery tower device, reduces the energy consumption, improves cold energy utilization efficiency, sled dress to whole cold energy recovery unit, adopts DCS to retrieve the sled simultaneously and controls, safe and reliable, easy operation, economic environmental protection, more is fit for using widely.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the structure of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the system comprises a natural gas storage tank, 2, a security condenser, 3, a cold energy recovery tower, 311, a condenser, 312, a reboiler, 4, a reheater, 5, an air temperature type vaporizer, 51, a temperature transmitter, 6 and a chilled water storage tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the LNG liquefaction cold energy distribution method includes a natural gas storage tank 1, a security condenser 2, a cold energy recovery tower 3, a condenser 311, a reboiler 312, a reheater 4, an air temperature vaporizer 5, a temperature transmitter 51 and a chilled water storage tank 6, wherein the cold energy recovery tower 3 includes the condenser 311 and the reboiler 312, the natural gas storage tank 1 is communicated with the condenser 311, and liquefied natural gas is heated and gasified by a heat exchange medium in the condenser 311 and then discharged out of the cold energy recovery tower 3 for use by a user; a security condenser 2 is arranged between the natural gas storage tank 1 and the cold energy recovery tower 3, the natural gas storage tank 1 is communicated with the security condenser 2 through a pipeline, a stop valve, an emergency cut-off valve and a regulating valve, a heat exchange medium feeding pipe orifice of the security condenser 2 is communicated with the top of the cold energy recovery tower 3, an LNG discharging pipe of the security condenser 2 is communicated with a condenser 311, a heat exchange medium discharging pipe orifice of the security condenser 2 is communicated with a reboiler 312, the chilled water storage tank 6 is communicated with the reboiler 312 through a pump, chilled water is cooled through a heat exchange medium in the reboiler 312, then discharged out of the cold energy recovery tower 3 and flows back into the chilled water storage tank 6 for circulating cooling, the heat exchange medium in the reboiler 312 and the chilled water are heated and gasified through heat exchange, then enter the condenser 311 again to exchange heat with liquefied natural gas, and a reheater 4 is, an LNG outlet pipeline of the cold energy recovery tower 3 is communicated with the heat absorption process of the reheater 4, and a chilled water outlet pipeline of the cold energy recovery tower 3 is communicated with the heat release process of the reheater 4; the liquefied natural gas discharged from the cold energy recovery tower 3 is further heated by the reheater 4 to meet the gas demand of users, and the chilled water discharged from the cold energy recovery tower 3 is further cooled by the reheater 4 and then flows back into the chilled water storage tank 6; the cold energy recovery tower 3 is respectively provided with a liquefied natural gas transmitter, a heat exchange medium transmitter and a heat exchange medium temperature transmitter, the liquid level transmitter is respectively in control linkage with an LNG feeding pipeline regulating valve and a chilled water pump, and the LNG discharging pipeline at the top of the cold energy recovery tower 3 is provided with a pressure transmitter and a temperature transmitter and is in control linkage with the pipeline regulating valve; the natural gas storage tank is characterized by further comprising an air-temperature vaporizer 5, the natural gas storage tank 1 is communicated with the air-temperature vaporizer 5 through a pipeline, a stop valve, an emergency cut-off valve and an adjusting valve, and temperature transmitters 51 are respectively arranged on natural gas outlet pipelines of the reheater 4 and the air-temperature vaporizer 5.
Preferably, the security condenser 2 is provided with a safety regulating device for regulating the pressure of the heat exchange medium and controlling the temperature of the heat exchange medium.
Preferably, the chilled water storage tank 6 is provided with a chilled water usage system and a makeup system.
Preferably, the chilled water storage tank 6 is provided with a liquid level transmitter and a temperature transmitter II which are respectively linked with the chilled water pump in a control way.
All the electric parts and components in the present case are universal standard parts or components known by the skilled person, the structure and principle of the electric parts and components can be known by the technical manual or the conventional experimental method, the model and the present scheme can be adapted to operate normally, all the electric parts and the power supply adapted to the electric parts in the present case are connected through a lead, and an appropriate controller is selected according to the actual situation to meet the control requirement, and the specific connection and control sequence are realized.
One specific application of this embodiment is:
when the invention is used, LNG in a natural gas storage tank 1 is sent to a security condenser 2 to perform first-stage heat exchange with heat exchange medium gas from a cold energy recovery tower 3, then the LNG is sent to a condenser 311 shell pass, the LNG in the upper shell pass of the cold energy recovery tower performs heat exchange with the heat exchange medium gasified in a tube pass, the gaseous heat exchange medium flows into a reboiler at the bottom of the cold energy recovery tower 3 after being condensed and liquefied, the liquefied natural gas is heated and gasified through heat exchange, the pressure of the liquefied natural gas is regulated by an adjusting valve at the top of the cold energy recovery tower, then the liquefied natural gas is sent to a reheater 4 to be further heated so as to ensure that the natural gas meets the gas demand after being heated, the heat exchange is performed between the natural gas and chilled water in the bottom of the reboiler of the cold energy recovery tower 3, chilled water with different application ranges can be obtained by selecting different heat exchange media and setting different pressures, the heat exchange medium is heated and gasified in the reboiler at, chilled water in the chilled water storage tank 6 is sent into the reboiler at the bottom of the tower through the chilled water pump, and the chilled water pump is chain with the level transmitter control of chilled water storage tank 6, the volume of the chilled water of control entering system, and the chilled water carries out the one-level heat transfer with the heat transfer medium after the liquefaction, then carries out the second grade heat transfer in sending into the reheater 4, and the chilled water after the cooling is sent into the 6 circulative refrigeration of chilled water storage tank again.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should understand that they can make various changes, modifications, additions and substitutions within the spirit and scope of the present invention.
Claims (4)
1. A LNG liquefaction cold energy distribution method is characterized in that: comprises a natural gas storage tank (1), a security condenser (2), a cold energy recovery tower (3), a condenser (311), a reboiler (312), a reheater (4), an air-temperature vaporizer (5), a temperature transmitter (51) and a chilled water storage tank (6),
the cold energy recovery tower (3) comprises a condenser (311) and a reboiler (312), the natural gas storage tank (1) is communicated with the condenser (311), a security condenser (2) is arranged between the natural gas storage tank (1) and the cold energy recovery tower (3), the natural gas storage tank (1) is communicated with the security condenser (2) through a pipeline, a stop valve, an emergency stop valve and an adjusting valve, a heat exchange medium feeding pipe opening of the security condenser (2) is communicated with the top of the cold energy recovery tower (3), an LNG discharging pipe of the security condenser (2) is communicated with the condenser (311), a heat exchange medium discharging pipe opening of the security condenser (2) is communicated with the reboiler (312), a freezing water storage tank (6) is communicated with the cold energy recovery tower (312) through a pump, a reheater (4) is arranged between the cold energy recovery tower (3) and the freezing water storage tank (6), an LNG outlet pipeline of the cold energy recovery tower (3) is communicated with the heat absorption process of the reheater (4), and a chilled water outlet pipeline of the cold energy recovery tower (3) is communicated with the heat release process of the reheater (4); the chilled water discharged by the cold energy recovery tower (3) is further cooled by a reheater (4) and then flows back into a chilled water storage tank (6);
the cold energy recovery tower (3) is respectively provided with a liquefied natural gas transmitter, a heat exchange medium transmitter and a heat exchange medium temperature transmitter, the liquid level transmitter is respectively in control linkage with an LNG feeding pipeline regulating valve and a chilled water pump, and an LNG discharging pipeline at the top of the cold energy recovery tower (3) is provided with a pressure transmitter and a temperature transmitter and is in control linkage with the pipeline regulating valve;
still include air temperature formula vaporizer (5), natural gas storage tank (1) is linked together through pipeline, stop valve, quick action emergency valve and governing valve and air temperature formula vaporizer (5), the natural gas outlet pipeline of reheater (4) and air temperature formula vaporizer (5) sets up temperature transmitter (51) respectively.
2. A LNG liquefaction cold energy distribution method according to claim 1, characterised in that: the security condenser (2) is provided with a safety adjusting device for adjusting the pressure of a heat exchange medium and controlling the temperature of the heat exchange medium.
3. A LNG liquefaction cold energy distribution method according to claim 1, characterised in that: the chilled water storage tank (6) is provided with a chilled water using system and a water replenishing system.
4. A LNG liquefaction cold energy distribution method according to claim 1, characterised in that: the chilled water storage tank (6) is provided with a liquid level transmitter and a temperature transmitter II which are respectively linked with the chilled water pump in a control way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011369907.7A CN112460485A (en) | 2020-11-30 | 2020-11-30 | LNG liquefaction cold energy distribution method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011369907.7A CN112460485A (en) | 2020-11-30 | 2020-11-30 | LNG liquefaction cold energy distribution method |
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| CN112460485A true CN112460485A (en) | 2021-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011369907.7A Pending CN112460485A (en) | 2020-11-30 | 2020-11-30 | LNG liquefaction cold energy distribution method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205618981U (en) * | 2016-04-25 | 2016-10-05 | 江苏德邦工程有限公司 | Liquefied natural gas cold energy recovery system |
| CN107304974A (en) * | 2016-04-25 | 2017-10-31 | 江苏德邦工程有限公司 | Cold energy of liquefied natural gas recovery system and method |
| WO2018160182A1 (en) * | 2017-03-02 | 2018-09-07 | The Lisbon Group, Llc | Systems and methods for transporting liquefied natural gas |
| CN108645247A (en) * | 2018-07-03 | 2018-10-12 | 中海油能源发展股份有限公司珠海冷能利用分公司 | A kind of comprehensive utilization cold energy of liquefied natural gas changes cooling system and method |
| KR20190127020A (en) * | 2018-05-03 | 2019-11-13 | 대우조선해양 주식회사 | Recovery of Volatile Organic Compounds System and Method for a Tanker |
-
2020
- 2020-11-30 CN CN202011369907.7A patent/CN112460485A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205618981U (en) * | 2016-04-25 | 2016-10-05 | 江苏德邦工程有限公司 | Liquefied natural gas cold energy recovery system |
| CN107304974A (en) * | 2016-04-25 | 2017-10-31 | 江苏德邦工程有限公司 | Cold energy of liquefied natural gas recovery system and method |
| WO2018160182A1 (en) * | 2017-03-02 | 2018-09-07 | The Lisbon Group, Llc | Systems and methods for transporting liquefied natural gas |
| KR20190127020A (en) * | 2018-05-03 | 2019-11-13 | 대우조선해양 주식회사 | Recovery of Volatile Organic Compounds System and Method for a Tanker |
| CN108645247A (en) * | 2018-07-03 | 2018-10-12 | 中海油能源发展股份有限公司珠海冷能利用分公司 | A kind of comprehensive utilization cold energy of liquefied natural gas changes cooling system and method |
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Application publication date: 20210309 |
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