LNG (Liquefied Natural Gas) cold energy comprehensive utilization system

Abstract

The invention relates to the technical field of LNG cold energy comprehensive utilization, in particular to an LNG cold energy comprehensive utilization system which comprises a plant factory module. The LNG cold energy power generation module is used for providing power needed by the plant factory module; and the LNG refrigeration module is used for providing water required by the plant factory module. The system has the beneficial effects that through the arrangement of the LNG cold energy power generation module and the LNG refrigeration module, the cold energy loss in the LNG heating process can be reduced, the ecology meeting the plant factory module crop growth and storage can be provided, further, energy is saved, and meanwhile damage to a marine ecological system is relieved.

Description

Technical Field

[0001] The invention relates to the technical field of comprehensive utilization of LNG cold energy, in particular to a comprehensive utilization system of LNG cold energy. Background Art

[0002] In order to facilitate transportation, natural gas is usually liquefied by freezing at extremely low temperatures (-162°C) under normal pressure. During the operation of LNG transport ships, the electricity required is provided by the combustion of LNG stored on board. When in use, the LNG at -162°C needs to be heated to NG gas at about 25°C. The traditional heating method involves the use of normal temperature seawater for heat exchange with LNG, which not only leads to a large amount of waste of cold energy, but also requires additional electricity to extract seawater. In addition, the used seawater is directly discharged back into the ocean, causing potential damage to the marine ecological environment. Usually, ships carry a small variety of green vegetables and have a short shelf life. Long sailing leads to a lack of fresh vegetables on board. In order to protect the health of the crew, it is urgent to solve the problem of insufficient vegetable supply in the later stages of long-distance voyages. Summary of the invention

[0003] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: an LNG cold energy comprehensive utilization system, which includes a plant factory module;

[0005] LNG cold energy power generation module: used to provide the required electricity for the plant factory module;

[0006] LNG refrigeration module: used to provide the required water for the plant factory module.

[0007] As a preferred solution of the LNG cold energy comprehensive utilization system of the present invention, the LNG cold energy power generation module includes:

[0008] LNG storage tank, rotary valve, first booster pump, semiconductor temperature difference power generation equipment and LNG expansion power generation equipment, and power supply device connected in sequence;

[0009] The power supply device is used to provide the required electricity for the plant factory modules.

[0010] As a preferred solution of the LNG cold energy comprehensive utilization system of the present invention, wherein: the rotary valve is arranged on the pipeline between the LNG storage tank and the first booster pump;

[0011] The rotary valve is used to control the amount of LNG from the LNG storage tank entering the first booster pump.

[0012] As a preferred solution of the LNG cold energy comprehensive utilization system of the present invention, the LNG cold energy power generation module further includes:

[0013] A four-stage heat exchanger connected to a semiconductor temperature difference power generation device, and a gas turbine power generation device connected to the four-stage heat exchanger;

[0014] The gas turbine power generation equipment is connected to the power supply device.

[0015] As a preferred solution of the LNG cold energy comprehensive utilization system of the present invention, the LNG refrigeration module includes:

[0016] a primary heat exchanger connected to the LNG expansion power generation equipment, a secondary heat exchanger connected to the primary heat exchanger, a tertiary heat exchanger connected to the secondary heat exchanger, and a second booster pump;

[0017] The third-stage heat exchanger is connected to the fourth-stage heat exchanger, and the second booster pump is connected to the fourth-stage heat exchanger.

[0018] As a preferred solution of the LNG cold energy comprehensive utilization system of the present invention, the LNG refrigeration module further includes:

[0019] A seawater desalination device connected to the primary heat exchanger;

[0020] The seawater desalination device is used to provide the required water for the plant factory modules.

[0021] As a preferred solution of the LNG cold energy comprehensive utilization system of the present invention, the LNG refrigeration module further includes:

[0022] A cold storage refrigeration device connected to the secondary heat exchanger;

[0023] Cold storage refrigeration device is used to store the products of the plant factory modules.

[0024] As a preferred solution of the LNG cold energy comprehensive utilization system of the present invention, the LNG refrigeration module further includes:

[0025] A regulating device in communication with the third-stage heat exchanger;

[0026] A regulating device for controlling the growth temperature of plant factory modules.

[0027] As a preferred solution of the LNG cold energy comprehensive utilization system of the present invention, it also includes a flue gas waste heat utilization module, including:

[0028] A waste heat boiler connected to a gas turbine power generation unit.

[0029] As a preferred solution of the LNG cold energy comprehensive utilization system of the present invention, the waste heat boiler is connected to the four-stage heat exchanger.

[0030] Beneficial effects of the present invention: The present invention can not only reduce the cold energy loss during LNG heating through the arrangement of LNG cold energy power generation module and LNG refrigeration module, but also provide an ecological system that meets the growth and storage of crops in the plant factory module. Furthermore, it saves energy while reducing damage to the marine ecosystem. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0032] Figure 1 This is a flow chart of the LNG cold energy comprehensive utilization system.

[0033] Figure 2 The figure is a flow chart of the power supply system.

[0034] Figure 3 The figure is a flow chart of the refrigeration system.

[0035] Figure 4 This is a flow chart of the flue gas waste heat utilization system. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0039] Example

[0040] Reference Figure 1 to Figure 4 , is an embodiment of the present invention, which provides an LNG cold energy comprehensive utilization system, which includes a plant factory module 14, wherein the plant factory module 14 is used for hydroponic vegetable crops;

[0041] LNG cold energy power generation module: used to provide the required electricity for the plant factory module 14;

[0042] LNG refrigeration module: used to provide the required water for the plant factory module 14.

[0043] Preferably, compared with soil cultivation, hydroponic vegetable crops have obvious advantages such as multiple cultivation at any height, efficient management, and substantial labor savings.

[0044] Furthermore, the LNG cold energy power generation module includes:

[0045] An LNG storage tank 1, a rotary valve 2, a first booster pump 3, a semiconductor temperature difference power generation device 4, an LNG expansion power generation device 5, and a power supply device 8 are connected in sequence;

[0046] The power supply device 8 is used to provide the required electricity for the plant factory module 14 .

[0047] Furthermore, the rotary valve 2 is arranged on the pipeline between the LNG storage tank 1 and the first booster pump 3;

[0048] The rotary valve 2 is used to control the amount of LNG from the LNG storage tank 1 entering the first booster pump 3 .

[0049] Furthermore, the LNG cold energy power generation module also includes:

[0050] A four-stage heat exchanger 6-4 connected to the semiconductor temperature difference power generation device 4, and a gas turbine power generation device 12 connected to the four-stage heat exchanger 6-4;

[0051] The gas turbine power generation equipment 12 is connected to the power supply device 8 .

[0052] It should be noted that the LNG (-162°C) pressurized by the first booster pump 3 and the flue gas (120°C) after the temperature is adjusted by the four-stage heat exchanger 6-4 enter the semiconductor temperature difference power generation device 4 together to generate electricity, with the LNG gas as the cold source and the flue gas after the temperature is adjusted as the heat source. The LNG after power generation by the semiconductor temperature difference power generation device 4 enters the LNG expansion power generation device 5 to expand and generate electricity, and the flue gas is discharged. The temperature of the LNG after passing through the LNG cold energy power generation module is about -90°C, and the generated electric energy enters the power supply device 88 to provide the electricity required by the plant factory module 14.

[0053] Furthermore, the LNG refrigeration module comprises:

[0054] A primary heat exchanger 6-1 connected to the LNG expansion power generation device 5, a secondary heat exchanger 6-2 connected to the primary heat exchanger 6-1, a tertiary heat exchanger 6-3 connected to the secondary heat exchanger 6-2, and a second booster pump 7;

[0055] The third-stage heat exchanger 6 - 3 is connected to the fourth-stage heat exchanger 6 - 4 , and the second booster pump 7 is connected to the fourth-stage heat exchanger 6 - 4 .

[0056] It should be noted that the LNG after the LNG expansion power generation device 5 passes through the primary heat exchanger 6-1, the secondary heat exchanger 6-2, the tertiary heat exchanger 6-3, and the quaternary heat exchanger 6-4 in sequence to transfer cold energy.

[0057] Furthermore, the LNG refrigeration module further includes:

[0058] A seawater desalination device 9 connected to the primary heat exchanger 6-1;

[0059] The seawater desalination device 9 is used to provide the water required by the plant factory module 14 .

[0060] It should be noted that the primary heat exchanger 6 - 1 releases cold energy and transmits it to the seawater desalination device 9 for desalination of seawater. The desalinated water source is used to provide the plant factory module 14 with water required for the growth of vegetable crops.

[0061] Furthermore, the LNG refrigeration module further includes:

[0062] A cold storage refrigeration device 10 connected to the secondary heat exchanger 6-2;

[0063] The cold storage device 10 is used to store the products of the plant factory module 14 .

[0064] It should be noted that the LNG (-35°C) after releasing cold energy in the primary heat exchanger 6-1 enters the secondary heat exchanger 6-2, and the released cold energy is transferred to the cold storage refrigeration device 10 for refrigeration, which is used to store the products of the plant factory module 14.

[0065] Furthermore, the LNG refrigeration module further includes:

[0066] A regulating device 11 in communication with the third-stage heat exchanger 6-3;

[0067] The regulating device 11 is used to control the growth temperature of the plant factory module 14 .

[0068] It should be noted that the LNG (-10°C) after releasing the cold energy in the secondary heat exchanger 6-2 enters the tertiary heat exchanger 6-3, and the released cold energy is transferred to the regulating device 11 for temperature regulation, which is used to control the growth temperature of the plant factory module 14. Further, the LNG (0°C) after releasing the cold energy in the tertiary heat exchanger 6-3 enters the quaternary heat exchanger 6-4.

[0069] Preferably, the arrangement of the LNG cold energy power generation module and the LNG refrigeration module can not only reduce the cold energy loss during the LNG heating process, but also provide an ecological environment that meets the growth and storage of crops in the plant factory module 14.

[0070] Furthermore, it also includes a flue gas waste heat utilization module, including:

[0071] A waste heat boiler 13 is connected to the gas turbine power generation equipment 12.

[0072] It should be noted that the flue gas waste heat utilization module is used to adjust the temperature of the NG gas entering the gas turbine power generation equipment 12 for combustion and power generation.

[0073] Furthermore, the waste heat boiler 13 is connected to the four-stage heat exchanger 6-4.

[0074] It should be noted that the flue gas generated after combustion in the gas turbine power generation equipment 12 is processed by the waste heat boiler 13 and then enters the four-stage heat exchanger 6-4 to exchange heat with the NG gas flowing through the four-stage heat exchanger 6-4 to adjust the temperature of the NG gas.

[0075] Preferably, the exhaust flue gas is cooled using LNG cold energy.

[0076] When in use, according to the demand for electric energy and cold energy required by the plant factory module 14, the opening of the rotary valve 2 is adjusted to control the amount of LNG entering the booster pump 73 from the LNG storage tank 1. The LNG pressurized by the booster pump 73 and the flue gas after the temperature is adjusted by the four-stage heat exchanger 6-4 enter the semiconductor temperature difference power generation device 4 together, and the -162°C LNG is used as a cold source and the 120°C flue gas is used as a heat source to generate electricity. The flue gas after the power generation is discharged into the atmosphere, and the LNG directly enters the expansion power generation device for expansion and power generation. The electric energy generated by the semiconductor temperature difference power generation device 4 and the expansion power generation device is uniformly entered into the power supply device 8, and the power supply device 8 is used to provide the power required by the plant factory module 14;

[0077] The temperature of the LNG after passing through the semiconductor temperature difference power generation device 4 and the expansion power generation device is about -90°C, and then passes through the primary heat exchanger 6-1, the secondary heat exchanger 6-2, the tertiary heat exchanger 6-3, and the quaternary heat exchanger 6-4 in sequence, and releases cold energy in the primary heat exchanger 6-1 and transmits it to the seawater desalination device 9 for seawater desalination. The desalinated water source is transported to the plant factory module 14, and the temperature of the LNG after passing through the primary heat exchanger 6-1 rises to -35°C; the temperature of the LNG after the secondary heat exchanger 6-2 works rises to -10°C, and the released cold energy is used for cooling the cold storage refrigeration device 10, and the products of the plant factory module 14 are stored by the cold storage refrigeration device 10;

[0078] After releasing cold energy in the secondary heat exchanger 6-2, the LNG enters the tertiary heat exchanger 6-3, and the released cold energy is transferred to the regulating device 11. The temperature of the LNG after passing through the tertiary heat exchanger 6-3 is about 0°C; after releasing cold energy in the tertiary heat exchanger 6-3, the LNG enters the quaternary heat exchanger 6-4, and exchanges heat with the flue gas discharged from the waste heat boiler 13. The temperature of the flue gas drops from 165°C to 120°C, and then enters the semiconductor temperature difference power generation device 4 as a heat source, and generates electricity together with the LNG at -162°C. At the same time, the temperature of the NG gas rises from 0°C to 25°C;

[0079] The flue gas generated after combustion in the gas turbine power generation equipment 12 is 400-650°C. The flue gas enters the waste heat boiler 13. The temperature of the flue gas after treatment by the waste heat boiler 13 is about 160°C. The flue gas enters the four-stage heat exchanger 6-4, exchanges heat with the 0°C NG gas flowing through the four-stage heat exchanger 6-4, and adjusts the NG gas temperature to 25°C.

[0080] In summary, the beneficial effect of the LNG cold energy comprehensive utilization system of the present invention is that through the setting of the LNG cold energy power generation module and the LNG refrigeration module, it can not only reduce the cold energy loss in the LNG heating process, but also provide an ecological environment that meets the growth and storage of crops in the plant factory module 14. Furthermore, it saves energy while reducing damage to the marine ecosystem.

[0081] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A LNG cold energy comprehensive utilization system, characterized by: include, Plant factory module (14); LNG cold energy power generation module: used to provide the required electricity for the plant factory module (14); LNG refrigeration module: used to provide the required water for the plant factory module (14).

2. The LNG cold energy comprehensive utilization system according to claim 1, characterized in that: LNG cold energy power generation module, including: An LNG storage tank (1), a rotary valve (2), a first booster pump (3), a semiconductor temperature difference power generation device (4) and an LNG expansion power generation device (5), and a power supply device (8) are sequentially connected; The power supply device (8) is used to provide the required electricity for the plant factory module (14).

3. The LNG cold energy comprehensive utilization system according to claim 2, characterized in that: The rotary valve (2) is arranged on a pipeline between the LNG storage tank (1) and the first booster pump (3); The rotary valve (2) is used to control the amount of LNG from the LNG storage tank (1) entering the first booster pump (3).

4. The LNG cold energy comprehensive utilization system according to claim 3, characterized in that: The LNG cold energy power generation module further includes: A four-stage heat exchanger (6-4) connected to the semiconductor temperature difference power generation device (4), and a gas turbine power generation device (12) connected to the four-stage heat exchanger (6-4); The gas turbine power generation equipment (12) is connected to the power supply device (8).

5. The LNG cold energy comprehensive utilization system according to claim 4, characterized in that: LNG refrigeration module, including, A primary heat exchanger (6-1) connected to the LNG expansion power generation device (5), a secondary heat exchanger (6-2) connected to the primary heat exchanger (6-1), a tertiary heat exchanger (6-3) connected to the secondary heat exchanger (6-2), and a second booster pump (7); The third-stage heat exchanger (6-3) is connected to the fourth-stage heat exchanger (6-4), and the second booster pump (7) is connected to the fourth-stage heat exchanger (6-4).

6. The LNG cold energy comprehensive utilization system according to claim 5, characterized in that: The LNG refrigeration module further includes: A seawater desalination device (9) connected to the primary heat exchanger (6-1); The seawater desalination device (9) is used to provide the water required by the plant factory module (14).

7. The LNG cold energy comprehensive utilization system according to claim 6, characterized in that: The LNG refrigeration module further includes: A cold storage device (10) connected to the secondary heat exchanger (6-2); The cold storage device (10) is used to store the products of the plant factory module (14).

8. The LNG cold energy comprehensive utilization system according to claim 7, characterized in that: The LNG refrigeration module further includes: A regulating device (11) in communication with the third-stage heat exchanger (6-3); The regulating device (11) is used to control the growth temperature of the plant factory module (14).

9. The LNG cold energy comprehensive utilization system according to any one of claims 4 to 8, characterized in that: It also includes a flue gas waste heat utilization module, including: A waste heat boiler (13) connected to the gas turbine power generation equipment (12).

10. The LNG cold energy comprehensive utilization system according to claim 9, characterized in that: The waste heat boiler (13) is in communication with the four-stage heat exchanger (6-4).

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