CN218599453U

CN218599453U - LNG cold energy comprehensive utilization system

Info

Publication number: CN218599453U
Application number: CN202223171486.4U
Authority: CN
Inventors: 吴国其; 黄卫杰; 周鼎程; 孟庆岩; 刘兴炜
Original assignee: Jiangsu Dingcheng New Energy Technology Co ltd; Jiangsu Yangkou Port Energy Technology Co ltd
Current assignee: Jiangsu Dingcheng New Energy Technology Co ltd; Jiangsu Yangkou Port Energy Technology Co ltd
Priority date: 2022-11-29
Filing date: 2022-11-29
Publication date: 2023-03-10
Anticipated expiration: 2032-11-29

Abstract

The utility model discloses a LNG cold energy comprehensive utilization system, including LNG storage device, LNG cryrogenic utilizes the device, the cold station is traded to the one-level, the cold station is traded to the second grade, the terminal is used, LNG storage device utilizes the device to link to each other with LNG cryrogenic through first LNG conveyer pipe, it is continuous with the cold station is traded to the one-level through the conveyer pipe after liquid NG that LNG cryrogenic utilized the device to come out mixes with LNG storage device LNG, the one-level is traded the cold station and is traded the cold station through first refrigerant conveyer pipe and a plurality of second grades and link to each other, the one-level is traded the cold station and still is linked to each other with NG return line, the cold station is traded respectively through second refrigerant conveyer pipe and is used continuously with a plurality of terminals, the utility model discloses rational in infrastructure, through the direct comprehensive make full use of cold energy of multistage heat transfer realization liquefied natural gas between the liquefied natural gas cold medium of liquefied natural gas through the cold energy, thereby realize energy recovery utilization, when saving the resource, still save the cost.

Description

LNG cold energy comprehensive utilization system

Technical Field

The utility model relates to an energy recovery utilizes technical field, specifically is a LNG cold energy comprehensive utilization system.

Background

LNG (liquefied natural gas) needs to be gasified and heated in advance before entering a natural gas pipe network, a large amount of cold energy is released in the LNG gasification process, and at present, the cold energy is lost in seawater or air because the cold energy cannot be stored, so an improved technology is urgently needed to solve the problem in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a LNG cold energy comprehensive utilization system to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a LNG cold energy comprehensive utilization system, includes that LNG storage device, LNG cryrogenic utilize device, one-level trade cold station, second grade trade cold station, terminal application, LNG storage device utilizes the device to link to each other with LNG cryrogenic through first LNG conveyer pipe, LNG cryrogenic utilizes the device to trade cold station through liquid NG conveyer pipe and one-level and links to each other, the one-level trades cold station and trades cold station through first refrigerant conveyer pipe and a plurality of second grade and links to each other, the one-level trades cold station and still links to each other with NG return pipe, the second grade trades cold station and links to each other with a plurality of terminal applications through second refrigerant conveyer pipe respectively, LNG storage device still trades cold station through second LNG conveyer pipe and one-level and links to each other.

Preferably, the utility model provides a pair of LNG cold energy comprehensive utilization system, wherein, LNG storage device comprises LNG receiving station, LNG satellite station and LNG storage tank.

Preferably, the utility model provides a pair of LNG cold energy comprehensive utilization system, wherein, LNG cryrogenic utilizes the device to be LNG cold energy power generation facility.

Preferably, the utility model provides a pair of LNG cold energy comprehensive utilization system, wherein, the one-level trades cold station and second grade and trades and still be provided with first order force (forcing) pump between the cold station.

Preferably, the utility model provides a pair of LNG cold energy comprehensive utilization system, wherein, the second grade trades and still is provided with the second grade force (forcing) pump between cold station and the terminal application.

Compared with the prior art, the beneficial effects of the utility model are that:

the comprehensive full utilization of the cold energy of the liquefied natural gas is realized by directly applying the cold energy of the liquefied natural gas and by multi-stage heat exchange between cold carrying media, so that the energy recovery and utilization are realized, and the cost is also saved while the resources are saved.

Drawings

FIG. 1 is a schematic view of the frame structure of the present invention;

fig. 2 is a schematic diagram of the comprehensive utilization principle of LNG cold energy power generation.

In the figure: LNG storage device 1, LNG cryrogenic utilizes device 2, the primary grade trades cold station 3, the secondary grade trades cold station 4, terminal application 5, first LNG conveyer pipe 6, liquid NG conveyer pipe 7, first refrigerant conveyer pipe 8, NG return pipe 9, second refrigerant conveyer pipe 10, second LNG conveyer pipe 11.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention;

it should be noted that, in the description of the present invention, it is to be noted that the terms "inside", "outside", "upper", "lower", "both sides", "one end", "the other end", "left", "right", and the like indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.

Referring to fig. 1, the present invention provides a technical solution: the LNG cold energy comprehensive utilization system comprises an LNG storage device 1, an LNG cryogenic utilization device 2, a primary cold exchange station 3, a secondary cold exchange station 4 and terminal applications 5, wherein the LNG storage device 1 is composed of an LNG receiving station, an LNG satellite station and an LNG storage tank, the LNG storage device 1 is connected with the LNG cryogenic utilization device 2 through a first LNG conveying pipe 6, the LNG cryogenic utilization device 2 is an LNG cold energy power generation device, the LNG cryogenic utilization device 2 is connected with the primary cold exchange station 3 through a liquid NG conveying pipe 7, the primary cold exchange station 3 is connected with a plurality of secondary cold exchange stations 4 through first refrigerant conveying pipes 8, a first stage booster pump is further arranged between the primary cold exchange station 3 and the secondary cold exchange stations 4 to achieve pressurization conveying of NG, the primary cold exchange station 3 is further connected with a return pipe 9, the secondary cold exchange station 4 is connected with the plurality of terminal applications 5 through second refrigerant conveying pipes 10, a second stage booster pump is further arranged between the secondary cold exchange stations 4 and the terminal applications 5 to achieve pressurization conveying of the secondary refrigerants, and the LNG storage device 1 is further connected with the primary cold exchange stations through second LNG conveying pipes 3.

Referring to fig. 2, an embodiment of the present application provides a method for comprehensively utilizing cold energy of an LNG receiving station, where the method for generating power by using LNG cold energy and comprehensively utilizing cold energy after power generation includes: LNG (liquefied natural gas) in a low-temperature and high-pressure state (-155 ℃ and 10 MPa) which is conveyed from the LNG receiving station enters the LNG cold energy power generation device, and is subjected to heat exchange with a circulating working medium through a #1 heat exchanger, so that the temperature is raised to about-70 ℃. After heat exchange with the turbine outlet circulating working medium through a #3 heat exchanger, the temperature is raised to about minus 34 ℃, and the gas is gasified into a gas state. And (3) mixing the liquefied natural gas at the temperature of about minus 34 ℃ with the residual LNG of the LNG receiving station, then entering a primary heat exchange cooling station 3, carrying out heat exchange and temperature rise through a primary refrigerant to obtain high-temperature NG gas and the cooled primary refrigerant, and returning the NG gas to the LNG receiving station gasifier or the air bath type gasifier through an NG return pipeline. Generally, the LNG cold energy power plant, the primary heat exchanger cold station 3, is located close to the LNG receiving station in the geographical location. The cooled primary refrigerant is conveyed to the secondary heat exchange station 4 through the first refrigerant conveying pipe, and generally, the secondary heat exchange station is far away from the geographical position of the primary heat exchange station and is close to the geographical position of the terminal application. And performing secondary heat exchange and temperature rise on the primary refrigerant through the secondary refrigerant to obtain a high-temperature primary refrigerant and a low-temperature secondary refrigerant. The first-stage refrigerant circulates between the first-stage heat exchanger and the second-stage heat exchanger, and the second-stage refrigerant is conveyed to a terminal through a second refrigerant conveying pipe to be applied.

In this application example, the method for comprehensively utilizing cold energy of liquefied natural gas further includes:

the circulating working medium (R125) in the cold energy power generation device does work in a #1 turbine to generate electric quantity, the temperature of the circulating working medium after doing work is reduced to about minus 65 ℃, and the pressure is reduced to 0.03MPa; the other circulating working medium (R125) does work in the #2 turbine to generate electricity, the temperature of the circulating working medium after doing work is reduced to about minus 25 ℃, and the pressure is reduced to 0.18Mpa. The circulating working medium at the turbine outlet of the #1 enters a heat exchanger of the #1, the temperature is reduced to minus 70 ℃, the working medium sequentially enters a booster pump of the #1 and a heat exchanger of the #2, and the working medium is heated to minus 34 ℃; the circulating working medium at the turbine outlet of the #2 is divided into two parts, about 70% of the circulating working medium enters the #3 heat exchanger to exchange heat with LNG, and the temperature is reduced to about minus 35 ℃; the circulating working medium at the turbine outlet #2 is divided into two parts, about 70% of the circulating working medium enters the heat exchanger #3 to exchange heat with LNG, and the temperature is reduced to about-35 ℃; the other part of about 30 percent of the circulating working medium enters a #2 heat exchanger to be converted into a liquid working medium at the temperature of minus 35 ℃ after heat exchange; the working media subjected to heat exchange by the heat exchangers #2 and #3 are subjected to heat exchange and then are converged into the booster pump #2, and the pressure is increased and then enters the heat exchanger # 5; the working media subjected to heat exchange by the #2 and #3 heat exchangers are subjected to heat exchange and then are converged into the #2 booster pump, and the pressure is increased and then enters the #5 heat exchanger; and the circulating working media after the heat exchange of the #2 and #3 heat exchangers are subjected to temperature rise and gasification by the #4 and #5 heat exchangers and then enter the #1 and #2 turbines for power generation. Wherein the cold energy power generation working medium is R125; the primary refrigerant is methanol; the secondary refrigerant is glycol water solution.

It should be noted that, in the present application, the direct application of cold energy is not limited to LNG cold energy power generation, and includes all direct application forms of cold energy.

This application realizes the comprehensive make full use of liquefied natural gas's cold energy through the direct application of liquefied natural gas cold energy and through carrying the multistage heat transfer between the cold medium to realize energy recovery and utilize, when saving the resource, still save the cost.

The details of the present invention are well known to those skilled in the art.

Finally, it is to be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified and replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims

1. The utility model provides a LNG cold energy comprehensive utilization system which characterized in that: including LNG storage device (1), LNG cryrogenic utilization device (2), one-level trade cold station (3), second grade trade cold station (4), terminal application (5), LNG storage device (1) utilizes device (2) to link to each other with LNG cryrogenic through first LNG conveyer pipe (6), LNG cryrogenic utilizes device (2) to trade cold station (3) with the one-level through liquid NG conveyer pipe (7) and links to each other, cold station (3) are traded with a plurality of second grades through first refrigerant conveyer pipe (8) to trade cold station (4) and link to each other to the one-level, cold station (3) are traded to the one-level still links to each other with NG return pipe (9), second grade is traded cold station (4) and is used (5) with a plurality of terminals through second refrigerant conveyer pipe (10) respectively and is linked to each other, LNG storage device (1) still trades cold station (3) with the one-level through LNG conveyer pipe (11) and links to each other.

2. An LNG cold energy comprehensive utilization system according to claim 1, characterized in that: the LNG storage device (1) is composed of an LNG receiving station, an LNG satellite station and an LNG storage tank.

3. The LNG cold energy comprehensive utilization system of claim 1, characterized in that: the LNG cryogenic utilization device (2) is an LNG cold energy power generation device.

4. An LNG cold energy comprehensive utilization system according to claim 1, characterized in that: and a first-stage pressurizing pump is also arranged between the first-stage cold exchange station (3) and the second-stage cold exchange station (4).

5. The LNG cold energy comprehensive utilization system of claim 1, characterized in that: and a second-stage pressure pump is also arranged between the second-stage cold exchange station (4) and the terminal application (5).