CN216976504U - Liquefied natural gas cold energy recycling device - Google Patents
Liquefied natural gas cold energy recycling device Download PDFInfo
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- CN216976504U CN216976504U CN202220609332.XU CN202220609332U CN216976504U CN 216976504 U CN216976504 U CN 216976504U CN 202220609332 U CN202220609332 U CN 202220609332U CN 216976504 U CN216976504 U CN 216976504U
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Abstract
The utility model relates to a liquefied natural gas cold energy recycling device.A Liquefied Natural Gas (LNG) storage bin is connected with a primary evaporator, a secondary evaporator and a tertiary evaporator in series in sequence and then is connected with a gas valve bank unit; the first refrigerant medium of the first-stage evaporator flows through the first-stage evaporator and then is sequentially connected in series with the first-stage cold energy utilization equipment and the first pump and then flows back to the first-stage evaporator; a second refrigerant medium of the second-stage evaporator flows through the second-stage evaporator and then is sequentially connected in series with second cascade cold energy utilization equipment and a second pump and then flows back to the second-stage evaporator; and a third cooling medium of the third-stage evaporator flows through the third-stage evaporator, is sequentially connected with the second heat exchanger and the third pump in series and then flows back to the third-stage evaporator. According to the utility model, the gasification process of the liquefied natural gas is divided into three steps so as to release cold energy in a step shape, and the cold energy utilization equipment is connected in series in the refrigerant loop, so that the cold energy released by each stage can be effectively utilized, the electric energy is saved, no additional fuel oil or only a small amount of fuel oil is needed, and the waste of heat energy is reduced.
Description
Technical Field
The utility model relates to the technical field of LNG cold energy utilization, in particular to a liquefied natural gas cold energy recycling device.
Background
Natural gas is one of the main energy sources in the world, and in order to facilitate transportation, the natural gas needs to be liquefied at ultralow temperature and then transported by using a liquefied natural gas ship. The process of gasifying liquefied natural gas into normal temperature gas releases a great deal of energy. The common gas supply unit evaporator heats the liquefied natural gas to the normal temperature of about 20-45 ℃ so as to be used by a dual-fuel main engine, a generator and a boiler. The cold energy of the liquefied natural gas at the temperature of 163 ℃ below zero and the fuel oil consumed by the steam cause waste of the cold energy and the heat energy, and meanwhile, the cold energy consumption equipment of the ship also needs to consume a large amount of electric energy. The utility model provides a cold energy recycling device for solving the problems of liquefied natural gas gasification cold energy and heat energy waste and ship electric energy loss.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a liquefied natural gas cold energy recycling device to solve the defects in the prior art, and the technical problem to be solved by the utility model is realized by the following technical scheme.
A liquefied natural gas cold energy recycling device comprises an LNG storage bin, wherein the LNG storage bin is connected with a primary evaporator, a secondary evaporator and a tertiary evaporator in series in sequence and then is connected with a gas valve bank unit to form a gasification passage; the first refrigerant medium of the first-stage evaporator flows through the first-stage evaporator and then is sequentially connected in series with first-stage cold energy utilization equipment and a first pump and then flows back to the first-stage evaporator to form a first refrigerant loop; a second refrigerant medium of the secondary evaporator flows through the secondary evaporator and then is sequentially connected in series with second gradient cold energy utilization equipment and a second pump and then flows back to the secondary evaporator to form a second refrigerant loop; and a third refrigerant medium of the third-stage evaporator flows through the third-stage evaporator, then is sequentially connected with a second heat exchanger and a third pump in series and then flows back to the third-stage evaporator to form a third refrigerant loop.
Preferably, the first-stage cold energy utilization device is a marine refrigerator.
Preferably, the first cold medium flows through the first step cold energy utilization device and is respectively provided with a valve a and a valve b before and after the first step cold energy utilization device.
Preferably, the second cascade cold energy utilization equipment in the second refrigerant loop is connected in parallel with the first heat exchanger.
Preferably, the preheating medium of the first heat exchanger is high-temperature water of a marine main engine or low-temperature water at an outlet of an air cooler.
Preferably, a first temperature sensor is arranged at a position where the second cooling medium flows through the second step cold energy utilization equipment.
Preferably, a first electromagnetic valve is arranged on the first heat exchanger, and the first temperature sensor is connected with the first electromagnetic valve.
Preferably, the second step cold energy utilization device is a marine central air conditioner or a marine refrigerator, or a series/parallel device of the marine central air conditioner and the marine refrigerator.
Preferably, a second temperature sensor is arranged at a position where the third cooling medium flows through the second heat exchanger, a second electromagnetic valve is arranged on the second heat exchanger, and the second temperature sensor is connected with the second electromagnetic valve.
Preferably, the preheating medium of the second heat exchanger is one or more of host high-temperature water, air cooler outlet low-temperature water, marine low-temperature water and steam.
According to the liquefied natural gas cold energy recycling device, the three evaporators are arranged, the gasification process of liquefied natural gas is divided into three steps, so that cold energy is released in a step shape, the cold energy released by natural gas is stored in a cold medium, and cold energy utilization equipment is connected in series in a refrigerant loop, so that the cold energy released by the cold medium is used by cold energy consumption equipment in a ship, the cold energy released by each stage can be effectively utilized, electric energy is saved, and the heating medium of the third-stage evaporator does not need additional fuel oil or only needs a small amount of fuel oil, so that the waste of heat energy is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
the reference numbers in the drawings are, in order: 1. the system comprises a gasification passage, 11, an LNG storage bin, 2, a primary evaporator, 3, a secondary evaporator, 4, a tertiary evaporator, 5, a first refrigerant circuit, 51, a first refrigerant inlet, 52, a first refrigerant outlet, 531, a valve a, 532, a valve b, 54, first stage cold energy utilization equipment, 55, a first pump, 6, a second refrigerant circuit, 61, a second refrigerant inlet, 62, a second refrigerant outlet, 631, a valve c, 632, a valve d, 633, a valve e, 634, a valve f, 64, second stage cold energy utilization equipment, 65, a second pump, 66, a first temperature sensor, 67, a first heat exchanger, 68, a first electromagnetic valve, 7, a third refrigerant circuit, 71, a third refrigerant inlet, 72, a third refrigerant outlet, 73, a second heat exchanger, 74, a third pump, 75, a second temperature sensor, 76, a second electromagnetic valve, 8 and a gas valve bank unit.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1:
referring to fig. 1, a liquefied natural gas cold energy recycling device includes an LNG storage tank 11, and is improved in that: the LNG storage bin 11 is sequentially connected in series with the primary evaporator 2, the secondary evaporator 3 and the tertiary evaporator 4 and then is connected into the gas valve bank unit 8 to form a gasification passage 1; the first refrigerant medium of the first-stage evaporator 2 flows through the first-stage evaporator 2 and then sequentially connects in series with the first-stage cold energy utilization equipment 54 and the first pump 55 to flow back to the first-stage evaporator 2, so as to form a first refrigerant loop 5; the second refrigerant medium of the second-stage evaporator 3 flows through the second-stage evaporator 3 and then is sequentially connected in series with the second gradient cold energy utilization device 64 and the second pump 65 and then flows back to the second-stage evaporator 3 to form a second refrigerant loop 6; the third refrigerant medium of the third-stage evaporator 4 flows through the third-stage evaporator 4, then is sequentially connected in series with the second heat exchanger 73 and the third pump 74, and then flows back to the third-stage evaporator 4 to form a third refrigerant loop 7.
In the embodiment, a primary evaporator 2, a secondary evaporator 3 and a tertiary evaporator 4 are respectively arranged in a gasification passage 1 of an LNG storage bin 11 gasified to normal-temperature gas supply gas valve group unit 8, the temperature of liquid natural gas in the LNG storage bin is about-162 ℃ in the gasification passage 1, and a first refrigerant medium heats the natural gas flowing through the primary evaporator 2 to-55 ℃ to-25 ℃; in the first refrigerant circuit 5, the temperature of the first refrigerant medium at the first refrigerant inlet 51 is about-40 ℃ to-15 ℃, after the natural gas is heated, the temperature of the first refrigerant medium at the first refrigerant outlet 52 is reduced to-50 ℃ to-20 ℃, part of cold energy in the natural gas is stored into the first cold energy medium, then the first refrigerant medium flows through the first step cold energy utilization equipment 54 in the first refrigerant loop 5 under the action of the first pump 55, the cold energy is released and supplied to the first step cold energy utilization equipment 54 for use, the electric energy which is originally required to be supplied to the first step cold energy utilization equipment 54 is saved, the temperature of the first refrigerant medium rises after the first refrigerant medium releases the cold energy, and the target temperature of-40 ℃ to-15 ℃ at the first refrigerant inlet 51 is reached, the preheating requirement of the first step of the liquefied natural gas is met, and the electric energy of the first step cold energy utilization equipment 54 is saved.
In the gasification passage 1, the natural gas at-55 ℃ to-25 ℃ flowing out of the primary evaporator 2 flows through the secondary evaporator 3 and is heated by the second cold medium, and the temperature of the natural gas is increased to-25 ℃ to-3 ℃; in the second refrigerant circuit 6, the temperature of the second refrigerant medium at the second refrigerant inlet 61 is about-10 ℃ to 7 ℃, after the natural gas is heated, the temperature of the second refrigerant medium at the second refrigerant outlet 62 is reduced to-20 ℃ to 2 ℃, part of cold energy in the natural gas is stored into the second cold energy medium, then the second refrigerant medium flows through the second step cold energy utilization equipment 64 in the second refrigerant loop 6 under the action of the second pump 65, the cold energy is released and supplied to the second step cold energy utilization equipment 64 for use, the electric energy which is originally required to be supplied to the second step cold energy utilization equipment 64 is saved, the temperature of the second refrigerant medium rises after the cold energy is released, and the target temperature of-10-7 ℃ at the second refrigerant inlet 61 is reached, the preheating requirement of the second step of the liquefied natural gas is met, and the electric energy of the second step cold energy utilization equipment 64 is saved.
In the gasification passage 1, the natural gas at-25 ℃ to-3 ℃ flowing out of the secondary evaporator 3 flows through the tertiary evaporator 4, is heated by a third cooling medium, and the temperature of the natural gas is raised to 20 ℃ to 45 ℃ so as to be supplied to a gas valve group unit 8 for use; in the third refrigerant loop 7, the temperature of the third refrigerant medium at the third refrigerant inlet 71 is about 30-55 ℃, after heating the natural gas, the temperature of the third refrigerant medium at the third refrigerant outlet 72 is reduced to 20-50 ℃, then the third refrigerant medium flows through the second heat exchanger 73 under the action of the third pump 74, and is heated to the target temperature of 30-55 ℃ at the third refrigerant inlet 71 by the preheating medium of the second heat exchanger 73, the preheating medium of the second heat exchanger 73 adopts one or more of host high-temperature water, air cooler outlet low-temperature water, ship low-temperature water and steam, wherein the temperature of the host high-temperature water is about 80-90 ℃, the temperature of the air cooler outlet low-temperature water is about 10-36 ℃, the ship low-temperature water is generally normal-temperature water such as seawater, the temperature is about 10-20 ℃, no additional fuel oil is needed, or only a little fuel oil is needed, so as to meet the circulation requirement of the third refrigerant medium, the waste of heat energy is reduced.
The embodiment provides a liquefied natural gas cold energy recycle device, through setting up three evaporimeter, three ladder has been divided with liquefied natural gas's gasification process, so that the cold energy is the echelonment release, the cold energy that the natural gas released is stored to the refrigerant medium in, and cold energy utilization equipment concatenates in the refrigerant return circuit, so that the cold energy that the refrigerant medium released supplies the cold energy consumer in the boats and ships to use, make the cold energy of every grade of release can both obtain effective utilization, the electric energy has been saved simultaneously, and third grade evaporimeter heating medium need not extra fuel or only need a small amount of fuel, the waste of heat energy has been reduced.
Further, the first stage cold energy utilization device 54 is a marine refrigerator. The cold energy consumed by the marine refrigerator is only about 1% of the cold energy of the liquefied natural gas, the liquefied natural gas stores the cold energy into the first refrigerant medium through the primary evaporator 2, the cold energy released by the first refrigerant medium is enough for the marine refrigerator, and the electric energy of the marine refrigerator is saved.
Further, a valve a531 and a valve b532 are respectively arranged before and after the first refrigerant medium flows through the first step cold energy utilization device 54, so as to control the start and the stop of the first refrigerant loop.
Further, the second cascade cold energy utilization device 64 is a marine central air conditioner or a marine refrigerator, or a series/parallel device of the marine central air conditioner and the marine refrigerator, and the cold energy required by the second cascade cold energy utilization device 64 is 80% -85% of the cold energy of the liquefied natural gas.
Further, a second temperature sensor 75 is disposed at a position where the third cooling medium flows through the second heat exchanger 73, a second electromagnetic valve 76 is disposed on the second heat exchanger 73, and the second temperature sensor 75 is connected to the second electromagnetic valve 76.
The second temperature sensor 75 is configured to detect a temperature value T2 of the third refrigerant medium that is about to flow back to the three-stage evaporator 4, and feed back a temperature value T2 to the second solenoid valve 76, where the second solenoid valve 76 is configured to control a flow rate of the preheating medium flowing through the second heat exchanger 73 according to a difference between the temperature value T2 and a target temperature value at the third refrigerant inlet 71, so that the third refrigerant medium is finally preheated to the target temperature.
Example 2:
in addition to embodiment 1, the second cascade cooling energy utilization device 64 in the second refrigerant circuit 6 is connected in parallel to the first heat exchanger 67.
Further, a valve c631 and a valve d632 are respectively disposed before and after the second cascade cold energy utilization device 64, so as to control the start and the close of the second refrigerant circuit.
When the main machine stops, the flow of the liquefied natural gas is less than that when the main machine runs, the cold energy stored by the liquefied natural gas and the second refrigerant medium in the cold-heat exchange mode is insufficient, after the liquefied natural gas and the second refrigerant medium are supplied to the second gradient cold energy utilization equipment 64 for use, the temperature of the second refrigerant medium is lower than the target temperature of minus 10 ℃ to 7 ℃ at the second refrigerant inlet 61, and the first heat exchanger 67 is arranged and used for preheating the temperature of the second refrigerant medium to the target temperature of minus 10 ℃ to 7 ℃ at the second refrigerant inlet 61.
Further, a valve e633 and a valve f634 are respectively arranged at the front and the rear of the first heat exchanger 67, so as to control the start and the close of the first heat exchanger 67.
Further, the preheating medium of the first heat exchanger 67 is high-temperature water of the marine main engine or low-temperature water of the air cooler outlet, so that additional fuel oil is not needed for preheating the second refrigerant medium, and waste of heat energy is reduced.
Further, a first temperature sensor 66 is arranged at a position where the second cold medium flows through the second gradient cold energy utilization device 64.
Further, a first electromagnetic valve 68 is arranged on the first heat exchanger 67, and the first temperature sensor 66 is connected with the first electromagnetic valve 68.
The first temperature sensor 66 is configured to detect a temperature value T1 of the second refrigerant medium at the outlet of the second gradient cold energy utilization device 64, and feed back a temperature value T1 to the first solenoid valve 68, where the first solenoid valve 68 is configured to control a flow rate of the preheating medium flowing through the first heat exchanger 67 according to a difference between the temperature value T1 and a target temperature value at the second refrigerant inlet 61, so that the second refrigerant medium is finally preheated to the target temperature.
It should be noted that the above detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. Furthermore, it will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than those illustrated or otherwise described herein.
Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, article, or apparatus.
Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may also be oriented in other different ways, such as by rotating it 90 degrees or at other orientations, and the spatially relative descriptors used herein interpreted accordingly.
In the above detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, like numerals typically identify like components, unless context dictates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented here.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a liquefied natural gas cold energy recycle device, stores storehouse (11), its characterized in that including LNG: the LNG storage bin (11) is connected with the first-stage evaporator (2), the second-stage evaporator (3) and the third-stage evaporator (4) in series in sequence and then is connected with the gas valve group unit (8) to form a gasification passage (1); the first refrigerant medium of the first-stage evaporator (2) flows through the first-stage evaporator (2), then is sequentially connected in series with first-stage cold energy utilization equipment (54) and a first pump (55), and then flows back to the first-stage evaporator (2) to form a first refrigerant loop (5); a second refrigerant medium of the secondary evaporator (3) flows through the secondary evaporator (3) and then is sequentially connected in series with a second gradient cold energy utilization device (64) and a second pump (65) and then flows back to the secondary evaporator (3) to form a second refrigerant loop (6); and a third cooling medium of the three-stage evaporator (4) flows through the three-stage evaporator (4), then is sequentially connected with a second heat exchanger (73) and a third pump (74) in series and then flows back to the three-stage evaporator (4) to form a third refrigerant loop (7).
2. The liquefied natural gas cold energy recycling device according to claim 1, wherein: the first stage cold energy utilization equipment (54) is a marine refrigerator.
3. The liquefied natural gas cold energy recycling device according to claim 1, wherein: the first cold medium flows through the first step cold energy utilization device (54) and is respectively provided with a valve a (531) and a valve b (532) before and after the first step cold energy utilization device.
4. The liquefied natural gas cold energy recycling device according to claim 1, wherein: and a first heat exchanger (67) is connected in parallel with a second step cold energy utilization device (64) in the second refrigerant loop (6).
5. The liquefied natural gas cold energy recycling device according to claim 4, wherein: the preheating medium of the first heat exchanger (67) is high-temperature water of a marine main engine or low-temperature water at an outlet of an air cooler.
6. The liquefied natural gas cold energy recycling device according to claim 4, wherein: and a first temperature sensor (66) is arranged at the position where the second cold medium mass flows through the second gradient cold energy utilization equipment (64).
7. The liquefied natural gas cold energy recycling device according to claim 6, wherein: the first heat exchanger (67) is provided with a first electromagnetic valve (68), and the first temperature sensor (66) is connected with the first electromagnetic valve (68).
8. The liquefied natural gas cold energy recycling device according to claim 1, wherein: the second step cold energy utilization equipment (64) is a marine central air conditioner or a marine refrigerator, or is serial/parallel equipment of the marine central air conditioner and the marine refrigerator.
9. The liquefied natural gas cold energy recycling device according to claim 1, wherein: a second temperature sensor (75) is arranged at a position where the third cooling medium flows through the second heat exchanger (73), a second electromagnetic valve (76) is arranged on the second heat exchanger (73), and the second temperature sensor (75) is connected with the second electromagnetic valve (76).
10. The liquefied natural gas cold energy recycling device according to claim 1, wherein: the preheating medium of the second heat exchanger (73) is one or more of host high-temperature water, air cooler outlet low-temperature water, marine low-temperature water and steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220609332.XU CN216976504U (en) | 2022-03-21 | 2022-03-21 | Liquefied natural gas cold energy recycling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220609332.XU CN216976504U (en) | 2022-03-21 | 2022-03-21 | Liquefied natural gas cold energy recycling device |
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| CN216976504U true CN216976504U (en) | 2022-07-15 |
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| CN202220609332.XU Active CN216976504U (en) | 2022-03-21 | 2022-03-21 | Liquefied natural gas cold energy recycling device |
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