System and method for refrigerating container by combining ship LNG (Liquefied Natural Gas) and carbon capture

Abstract

The invention relates to a system and method for refrigerating a container through combination of ship LNG and carbon capture, and the system comprises an LNG system, a CO2 generation and capture system, a CO2 release and liquefaction system, a dry ice generation and storage system which is used for processing liquid CO2 into dry ice for storage, and a liquid CO2 container refrigeration box cooling system which is used for feeding the liquid CO2 into the container to cool the container refrigeration box. According to the system, the four independent systems including the LNG system, the CO2 generation and capture system, the dry ice generation and storage system and the liquid CO2 container refrigeration box cooling system can achieve interactive heat exchange, the energy utilization rate is increased, the prepared dry ice can be further utilized, and the economical efficiency is also improved. The temperature of each part of the system is ensured to be appropriate by arranging three temperature control valves, specifically, the temperature of the container refrigeration box group is ensured to be appropriate, the liquid CO2 cooled by dry ice is ensured not to be supercooled, and the container dry ice storage box group cooled by LNG is ensured not to be supercooled.

Description

Technical Field

[0001] The present invention relates to the technical field of container ship refrigeration, and in particular to a system and method for combining ship LNG and carbon capture for container refrigeration. Background Art

[0002] As global emission restrictions become increasingly stringent, many container ships are equipped with LNG systems and carbon dioxide capture systems. Considering the transportation of refrigerated goods, container ships also need to be equipped with cold box refrigeration systems. Although multiple systems require heat exchange, each system is relatively independent and there is no mutual heat exchange, resulting in low energy utilization. Summary of the invention

[0003] In response to the technical problems raised above, a system and method for combining ship LNG and carbon capture for container refrigeration is provided.

[0004] The technical means adopted by the present invention are as follows:

[0005] A system for combining ship LNG and carbon capture for container refrigeration, comprising:

[0006] LNG system, used to process LNG and gasify it for use as fuel.

[0007] The CO2 generation and capture system is used to capture and recover the CO2 generated after the gasification and combustion of LNG. The CO2 release and liquefaction system is used to liquefy the recovered CO2.

[0008] Dry ice generation and storage systems for processing liquid CO2 into dry ice for storage, and,

[0009] The liquid CO2 container refrigerated box cooling system is used to deliver liquid CO2 into the container to cool the container refrigerated box.

[0010] Furthermore, the LNG system includes an LNG fuel supply unit and a gas processing unit, an LNG-CO2 heat exchanger is arranged between the LNG fuel supply unit and the gas processing unit, a heat exchange pipeline is arranged between the LNG fuel supply unit and the LNG-CO2 heat exchanger, the heat exchange pipeline is connected to the container dry ice storage box group, and a container dry ice storage box temperature control valve is arranged on the heat exchange pipeline for adjusting the LNG flow entering the dry ice storage box.

[0011] Furthermore, the CO2 generation and capture system includes a gas-using device and a combustion waste gas CO2 capture unit, wherein the gas-using device is connected to the output end of the LNG system, and the combustion waste gas CO2 capture unit is connected to the CO2 release and liquefaction system.

[0012] Furthermore, the CO2 release and liquefaction system includes a CO2 release unit and a CO2 liquefaction unit, and the pipeline between the CO2 release unit and the CO2 liquefaction unit performs heat exchange through an LNG-CO2 heat exchanger.

[0013] Furthermore, the dry ice generation and storage system includes a first liquid CO2 pump, a dry ice generation unit and a container dry ice storage box, the input end of the first liquid CO2 pump is connected to the CO2 release and liquefaction system, and the output end is connected to the dry ice generation unit, the dry ice generation unit is used to solidify CO2, and the solidified dry ice is stored in the container dry ice storage box.

[0014] Furthermore, the liquid CO2 container refrigerated box cooling system includes a second liquid CO2 pump, a container refrigerated box temperature control valve, a container refrigerated box and a liquid CO2 temperature control valve, wherein the input end of the second liquid CO2 pump is connected to the CO2 release and liquefaction system, one output end thereof is connected to the container refrigerated box, and the other output end bypasses the container refrigerated box and is connected to the container refrigerated box output pipeline, the output end of the container refrigerated box is provided with the container refrigerated box output pipeline, the container refrigerated box temperature control valve is provided between the second liquid CO2 pump and the container refrigerated box, and is used to switch the liquid CO2 to be delivered to the corresponding pipeline; the container refrigerated box output pipeline is connected to the liquid CO2 temperature control valve, one output end of the liquid CO2 temperature control valve is connected to the dry ice generation and storage system, when the liquid CO2 is overcooled, the flow rate entering the dry ice box is reduced, and when the liquid CO2 is overheated, the flow rate entering the dry ice box is increased, and the other output end of the liquid CO2 temperature control valve is connected to the pipeline between the CO2 release and liquefaction system and the input end of the second liquid CO2 pump.

[0015] The present invention also discloses a method for combining ship LNG and carbon capture as container refrigeration, comprising:

[0016] The LNG system, dry ice generation and storage system, and liquid CO2 container refrigerated storage tank cooling system realize interactive heat exchange through the container dry ice storage tank group, the LNG is heated once, and the dry ice generation and storage system and liquid CO2 container refrigerated storage tank cooling system are cooled;

[0017] The LNG system, CO2 release and liquefaction system realize mutual heat exchange through the LNG-CO2 heat exchanger, the LNG is secondary heated and the CO2 is cooled and liquefied.

[0018] LNG is gasified and used as fuel, and the CO2 generation and capture system captures and recovers the CO2 generated after LNG gasification and combustion;

[0019] The container refrigerated box group is cooled by liquid CO2, the liquid CO2 is heated and the container refrigerated box is cooled.

[0020] Furthermore, the temperature data is collected through the set temperature control system, and based on the collected temperature data, the pipeline adjustment of the temperature control valve of the container refrigerated storage box is adjusted to reduce the amount of liquid CO2 entering when the refrigerated box is overcooled, and increase the amount of liquid CO2 entering when the refrigerated box is overheated;

[0021] Based on the collected temperature data, adjust the pipeline of the liquid CO2 temperature control valve, reduce the flow rate into the dry refrigerator when the liquid CO2 is overcooled, and increase the flow rate into the dry refrigerator when the liquid CO2 is overheated;

[0022] Based on the collected temperature data, the opening of the temperature control valve of the container dry ice storage box is adjusted. When the dry ice is too cold, the LNG flow entering the dry ice box is reduced. When the dry ice is too hot, the LNG flow entering the dry ice box is increased.

[0023] Compared with the prior art, the present invention has the following advantages: the present invention can realize the interactive heat exchange of four independent systems, namely, the LNG system, the CO2 generation and capture system, the dry ice generation and storage system, and the liquid CO2 container refrigerated box cooling system, thereby improving the energy utilization rate, and the produced dry ice can be further utilized, which also improves the economic efficiency. By setting three temperature control valves, it is ensured that the temperature of each part of the system is appropriate, specifically to ensure that the temperature of the container refrigerated box group is appropriate, to ensure that the liquid CO2 cooled by dry ice will not be overcooled, and to ensure that the container dry ice storage box group cooled by LNG will not be overcooled. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 This is a system diagram of the present invention. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0030] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0031] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0032] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0033] like Figure 1 As shown, an embodiment of the present invention discloses a system for combining ship LNG and carbon capture for container refrigeration, comprising:

[0034] LNG system, used to process LNG and gasify it for use as fuel.

[0035] The CO2 generation and capture system is used to capture and recover the CO2 generated after the gasification and combustion of LNG. The CO2 release and liquefaction system is used to liquefy the recovered CO2.

[0036] Dry ice generation and storage systems for processing liquid CO2 into dry ice for storage, and,

[0037] The liquid CO2 container refrigerated box cooling system is used to deliver liquid CO2 into the container to cool the container refrigerated box.

[0038] The present invention uses multiple systems for interactive heat exchange, so that LNG is gradually heated, CO2 is recycled and utilized, and multiple heat exchanges are carried out to generate dry ice, thereby achieving efficient energy utilization.

[0039] The LNG system includes an LNG fuel supply unit 1 and a gas processing unit 4, an LNG-CO2 heat exchanger 3 is arranged between the LNG fuel supply unit and the gas processing unit, a heat exchange pipeline is arranged between the LNG fuel supply unit and the LNG-CO2 heat exchanger, the heat exchange pipeline is connected to the container dry ice storage box group, and a container dry ice storage box temperature control valve 2 is arranged on the heat exchange pipeline for adjusting the LNG flow entering the dry ice storage box.

[0040] The CO2 generation and capture system comprises a gas-using device 5 and a combustion exhaust gas CO2 capture unit 6. The gas-using device is connected to the output end of the LNG system, and the combustion exhaust gas CO2 capture unit is connected to the CO2 release and liquefaction system.

[0041] The CO2 release and liquefaction system comprises a CO2 release unit 7 and a CO2 liquefaction unit 8, and the pipeline between the CO2 release unit and the CO2 liquefaction unit is heat exchanged through an LNG-CO2 heat exchanger.

[0042] The dry ice generation and storage system includes a first liquid CO2 pump 9.1, a dry ice generation unit 10 and a container dry ice storage box (group) 11. The input end of the first liquid CO2 pump is connected to the CO2 release and liquefaction system, and the output end is connected to the dry ice generation unit. The dry ice generation unit is used to solidify CO2, and the solidified dry ice is stored in the container dry ice storage box.

[0043] The liquid CO2 container refrigerated box cooling system comprises a second liquid CO2 pump 9.2, a container refrigerated box temperature control valve 12, a container refrigerated box (group) 13 and a liquid CO2 temperature control valve 14, wherein the input end of the second liquid CO2 pump is connected to the CO2 release and liquefaction system, one output end thereof is connected to the container refrigerated box, and the other output end bypasses the container refrigerated box and is connected to the container refrigerated box output pipeline, the container refrigerated box output pipeline is arranged at the output end of the container refrigerated box, and the container refrigerated box temperature control valve 14 is connected to the container refrigerated box output pipeline. It is arranged between the second liquid CO2 pump and the container refrigerator, and is used to switch the liquid CO2 to the corresponding pipeline; the container refrigerator output pipeline is connected to the liquid CO2 temperature control valve, one output end of the liquid CO2 temperature control valve is connected to the dry ice generation and storage system, and the flow rate entering the dry ice box is reduced when the liquid CO2 is overcooled, and the flow rate entering the dry ice box is increased when the liquid CO2 is overheated, and the other output end of the liquid CO2 temperature control valve is connected to the pipeline between the CO2 release and liquefaction system and the input end of the second liquid CO2 pump.

[0044] The present invention also discloses a method for combining ship LNG and carbon capture as container refrigeration, comprising:

[0045] The LNG system, dry ice generation and storage system, and liquid CO2 container refrigerated storage tank cooling system realize interactive heat exchange through the container dry ice storage tank group, the LNG is heated once, and the dry ice generation and storage system and liquid CO2 container refrigerated storage tank cooling system are cooled;

[0046] The LNG system, CO2 release and liquefaction system realize mutual heat exchange through the LNG-CO2 heat exchanger, the LNG is secondary heated and the CO2 is cooled and liquefied.

[0047] LNG is gasified and used as fuel, and the CO2 generation and capture system captures and recovers the CO2 generated after LNG gasification and combustion;

[0048] The container refrigerated box group is cooled by liquid CO2, the liquid CO2 is heated and the container refrigerated box is cooled.

[0049] Temperature data collection is performed through the set temperature control system;

[0050] To ensure that the temperature of the container refrigerated box group is appropriate, the container refrigerated storage box temperature control valve is adjusted based on the collected temperature data to adjust the pipeline. When the refrigerated box is too cold, the amount of liquid CO2 entering is reduced, and when the refrigerated box is overheated, the amount of liquid CO2 entering is increased;

[0051] To ensure that the temperature of the liquid CO2 cooled by dry ice is appropriate, the liquid CO2 temperature control valve is adjusted based on the collected temperature data to adjust the pipeline. When the liquid CO2 is overcooled, the flow rate entering the dry ice freezer is reduced, and when the liquid CO2 is overheated, the flow rate entering the dry ice freezer is increased.

[0052] To ensure that the temperature of the container dry ice storage box group is appropriate, the opening of the container dry ice storage box temperature control valve is adjusted based on the collected temperature data. When the dry ice is too cold, the LNG flow entering the dry ice box is reduced, and when the dry ice is too hot, the LNG flow entering the dry ice box is increased.

[0053] Finally, 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A system for combining ship LNG and carbon capture for container refrigeration, characterized in that: include: LNG system, used to process LNG and gasify it for use as fuel. CO2 generation and capture system is used to capture and recover the CO2 generated after LNG gasification and combustion. CO2 release and liquefaction system is used to liquefy the recovered CO2. Dry ice generation and storage systems for processing liquid CO2 into dry ice for storage, and, The liquid CO2 container refrigerated box cooling system is used to deliver liquid CO2 into the container to cool the container refrigerated box.

2. The system for combining ship LNG and carbon capture for container refrigeration according to claim 1 is characterized in that: The LNG system includes an LNG fuel supply unit and a gas processing unit, an LNG-CO2 heat exchanger is arranged between the LNG fuel supply unit and the gas processing unit, a heat exchange pipeline is arranged between the LNG fuel supply unit and the LNG-CO2 heat exchanger, the heat exchange pipeline is connected to the container dry ice storage box group, and a container dry ice storage box temperature control valve is arranged on the heat exchange pipeline for adjusting the LNG flow entering the dry ice storage box.

3. The system for combining ship LNG and carbon capture for container refrigeration according to claim 1 is characterized in that: The CO2 generation and capture system comprises a gas-using device and a combustion waste gas CO2 capture unit, wherein the gas-using device is connected to the output end of the LNG system, and the combustion waste gas CO2 capture unit is connected to the CO2 release and liquefaction system.

4. The system for combining ship LNG and carbon capture for container refrigeration according to claim 1 is characterized in that: The CO2 release and liquefaction system comprises a CO2 release unit and a CO2 liquefaction unit, and the pipeline between the CO2 release unit and the CO2 liquefaction unit is heat exchanged through an LNG-CO2 heat exchanger.

5. The system for combining ship LNG and carbon capture for container refrigeration according to claim 1 is characterized in that: The dry ice generation and storage system includes a first liquid CO2 pump, a dry ice generation unit and a container dry ice storage box. The input end of the first liquid CO2 pump is connected to the CO2 release and liquefaction system, and the output end is connected to the dry ice generation unit. The dry ice generation unit is used to solidify CO2, and the solidified dry ice is stored in the container dry ice storage box.

6. The system for combining ship LNG and carbon capture for container refrigeration according to claim 1, characterized in that: The liquid CO2 container refrigerated box cooling system comprises a second liquid CO2 pump, a container refrigerated box temperature control valve, a container refrigerated box and a liquid CO2 temperature control valve, wherein an input end of the second liquid CO2 pump is connected to a CO2 release and liquefaction system, one output end thereof is connected to a container refrigerated box, and the other output end bypasses the container refrigerated box and is connected to an output pipeline of the container refrigerated box, the output end of the container refrigerated box is provided with the container refrigerated box output pipeline, the container refrigerated box temperature control valve is provided between the second liquid CO2 pump and the container refrigerated box, and is used for switching liquid CO2 to be delivered to a corresponding pipeline; the container refrigerated box output pipeline is connected to the liquid CO2 temperature control valve, one output end of the liquid CO2 temperature control valve is connected to a dry ice generation and storage system, when liquid CO2 is overcooled, the flow rate entering the dry ice box is reduced, and when liquid CO2 is overheated, the flow rate entering the dry ice box is increased, and the other output end of the liquid CO2 temperature control valve is connected to a pipeline between the CO2 release and liquefaction system and an input end of the second liquid CO2 pump.

7. A method for combining ship LNG and carbon capture as container refrigeration based on any one of the systems of claims 1 to 6, characterized in that: include: The LNG system, dry ice generation and storage system, and liquid CO2 container refrigerated storage tank cooling system realize interactive heat exchange through the container dry ice storage tank group, the LNG is heated once, and the dry ice generation and storage system and liquid CO2 container refrigerated storage tank cooling system are cooled; The LNG system, CO2 release and liquefaction system realize mutual heat exchange through the LNG-CO2 heat exchanger, the LNG is secondary heated and the CO2 is cooled and liquefied. LNG is gasified and used as fuel, and the CO2 generation and capture system captures and recovers the CO2 generated after LNG gasification and combustion; The container refrigerated box group is cooled by liquid CO2, the liquid CO2 is heated and the container refrigerated box is cooled.

8. The method according to claim 7, characterized in that The temperature control system is used to collect temperature data, and based on the collected temperature data, the pipe adjustment of the temperature control valve of the container refrigerated storage box is adjusted to reduce the amount of liquid CO2 entering when the refrigerated box is too cold, and increase the amount of liquid CO2 entering when the refrigerated box is overheated; Based on the collected temperature data, adjust the pipeline of the liquid CO2 temperature control valve, reduce the flow rate into the dry refrigerator when the liquid CO2 is overcooled, and increase the flow rate into the dry refrigerator when the liquid CO2 is overheated; Based on the collected temperature data, the opening of the temperature control valve of the container dry ice storage box is adjusted. When the dry ice is too cold, the LNG flow entering the dry ice box is reduced. When the dry ice is too hot, the LNG flow entering the dry ice box is increased.

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