Refrigerated liquefied gas cold energy utilization system

Abstract

The utility model discloses a frozen liquefied gas cold energy utilization system, which relates to the field of liquid gas gasification process, and adopts the technical scheme that the frozen liquefied gas cold energy utilization system comprises a cold supply unit which comprises a cold supply liquid storage tank, and liquefied gas is stored in the cold supply liquid storage tank; the cold energy conversion unit is communicated with the cold supply unit and can perform cold energy exchange; the cold energy storage unit is communicated with the cold energy conversion unit, and a recyclable cold energy passage is formed between the cold energy storage unit and the cold energy conversion unit; and the heat exchange unit communicates with the cold energy storage unit, and a recyclable heat exchange channel is formed between the heat exchange unit and the cold energy storage unit. The device has the advantages that cold energy generated during gasification of low-temperature liquid is fully utilized, cooling circulating water used in the process is produced, waste of water resources can be effectively reduced, energy consumption of circulating water refrigeration is reduced, and the energy-saving and environment-friendly effects are achieved.

Description

Technical Field

[0001] The utility model relates to the field of liquid gas gasification technology, in particular to a cold energy utilization system for freezing liquefied gas. Background Art

[0002] Currently, in the industrial gas utilization process, the gasification equipment for liquid, low-temperature industrial gases generally uses air-cooled vaporizers. Air-cooled vaporizers operate by utilizing natural convection to heat the low-temperature liquid gas, vaporizing it into room-temperature gas. However, some industrial gas production processes involve equipment such as compressors that generate significant amounts of heat. These equipment require maintenance using circulating water cooling systems, which generate significant amounts of circulating water heat return. This heat return is typically cooled through cooling towers, where it comes into direct contact with the air and is cooled through convection with the cold air and water evaporation. Some industrial gas production processes also utilize cooling water, which is cooled by refrigeration units. These processes also have numerous drawbacks, such as water evaporation during convection heat exchange, resulting in wasted water resources, increased energy consumption in summer, high noise levels, and large floor space requirements. Utility Model Content

[0003] In view of one of the deficiencies of the prior art, the utility model provides a system for utilizing cold energy of refrigerated liquefied gas, which solves the problem of utilizing cold energy of refrigerated liquefied gas.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a system for utilizing cold energy of refrigerated liquefied gas, comprising:

[0005] The cooling unit includes a cooling liquid storage tank, wherein liquefied gas is stored in the cooling liquid storage tank;

[0006] a cold energy conversion unit, connected to the cooling unit, capable of exchanging cold energy;

[0007] a cold energy storage unit, connected to the cold energy conversion unit, forming a circulatory cold energy path between the cold energy storage unit and the cold energy conversion unit;

[0008] The heat exchange unit is connected to the cold energy storage unit, and a circulatory heat exchange path is formed between the heat exchange unit and the cold energy storage unit.

[0009] Preferably, the cold energy conversion unit comprises:

[0010] Outer box, a box with a hollow interior;

[0011] The cooling energy pipe is arranged inside the outer box and is a coil.

[0012] Preferably, the outer box is provided with:

[0013] The first conversion port group includes a first conversion inlet and a first conversion outlet; the inlet end of the cold energy pipe is communicated with the outlet end of the cooling unit through the first conversion inlet; the outlet end of the cold energy pipe is communicated with the inlet end of the external gas-using terminal through the first conversion outlet.

[0014] The second conversion port group includes a second conversion inlet and a second conversion outlet, and the outer box is communicated with the cold energy storage unit through the second conversion inlet and the second conversion outlet.

[0015] Preferably, the cold energy storage unit is a storage tank, and a liquid capable of cold energy exchange is stored inside; the cold energy storage unit includes:

[0016] The first circulation port group includes a first circulation inlet and a first circulation outlet, and the first circulation port group is communicated with the second conversion port group through a pipeline; the first circulation port group is used for collecting cold energy by the cold energy storage unit.

[0017] The second circulation port group includes a second circulation inlet and a second circulation outlet, and the second circulation port group is communicated with the heat exchange unit; the second circulation port group is used for outputting cold energy to the heat exchange unit.

[0018] Preferably, it further includes:

[0019] The first pump group is arranged between the pipelines of the second conversion port group and the first circulation port group.

[0020] Preferably, the first pump group is arranged on the pipeline corresponding to the first circulation inlet or the pipeline corresponding to the first circulation outlet of the first circulation port group;

[0021] The first pump group includes two pump machines arranged in parallel.

[0022] Preferably, the cold energy conversion unit further includes:

[0023] The inner box group is arranged inside the outer box, and the inner box group is wrapped outside the cold energy pipe;

[0024] The following are further arranged on the outer box:

[0025] The third conversion port group includes a third conversion inlet and a third conversion outlet; the inner box group is communicated with the heat supply unit through the third conversion port group.

[0026] Preferably, the heat supply unit is a heat exchange unit, and the third conversion inlet of the third conversion port group is communicated with the outlet end of the heat exchange unit.

[0027] Preferably, it further includes:

[0028] The heat storage tank is arranged on the pipeline corresponding to the third conversion outlet in the third conversion port group.

[0029] Preferably, it further includes:

[0030] The second pump group is arranged on the pipeline corresponding to the third conversion inlet in the third conversion port group;

[0031] The second pump group includes two pumps, one of which is communicated with the outlet end of the heat exchange unit, and the other is an air pump.

[0032] Compared with the prior art, the following beneficial effects are achieved: The present invention makes full use of the cold energy generated when the cryogenic liquid vaporizes, produces the cooling circulating water used in the process, can effectively reduce the waste of water resources, and reduce the energy consumption of circulating water refrigeration, playing the role of energy conservation and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of an embodiment of the present application;

[0034] Figure 2 It is a schematic diagram of the overall structure of the cold energy conversion unit of an embodiment of the present application Figure 1 ;

[0035] Figure 3 It is a schematic diagram of the overall structure of the cold energy conversion unit of an embodiment of the present application Figure 2 ;

[0036] Figure 4 It is a schematic diagram of the internal structure of the cold energy conversion unit of an embodiment of the present application Figure 1 ;

[0037] Figure 5 It is a schematic diagram of the internal structure of the cold energy conversion unit of an embodiment of the present application Figure 2 ;

[0038] Figure 6 It is a schematic diagram of the internal structure of the cold energy conversion unit of an embodiment of the present application Figure 3 .

[0039] In the figure:

[0040] 1, cooling unit;

[0041] 2, cold energy conversion unit; 21, outer box; 201, first conversion port group; 202, second conversion port group; 203, third conversion port group; 204, observation window; 205, drain pipe; 22, cold energy pipe; 23, inner box group; 24, main box; 241, observation window; 242, drain pipe;

[0042] 3, cold energy storage unit; 31, first circulation port group; 32, second circulation port group;

[0043] 4, heat exchange unit; 5, external gas using terminal; 6, first pump group; 7, second pump group; 8, heat storage tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0045] Please refer to Figure 1 , the present application provides the following technical solutions:

[0046] A cold energy utilization system for cryogenic liquefied gas includes a cold supply unit 1, a cold energy conversion unit 2, a cold energy storage unit 3, a heat exchange unit 4, and an external gas-using terminal 5.

[0047] Among them, the cold supply unit 1 is a cold supply liquid storage tank, which stores liquefied gas inside, such as liquid oxygen, liquid nitrogen, liquid argon, liquid carbon dioxide, etc. The cold energy conversion unit 2 is connected to the cold supply unit 1 and is used for recovering the cold energy of low-temperature liquid gasification, and can exchange cold energy with the liquid in the cold energy storage unit 3. The cold energy conversion unit 2 includes an outer box 21 and cold energy pipes 22. The outer box 21 is a box body with a cavity inside; the cold energy pipes 22 are arranged inside the outer box 21 and are in a serpentine coil structure. The outer box 21 is provided with a first conversion port group 201 and a second conversion port group 202. The first conversion port group 201 includes a first conversion inlet and a first conversion outlet; the inlet end of the cold energy pipe 22 is connected to the outlet end of the cold supply unit 1 through the first conversion inlet; the outlet end of the cold energy pipe 22 is connected to the inlet end of the external gas-using terminal 5 through the first conversion outlet; the second conversion port group 202 includes a second conversion inlet and a second conversion outlet, and the outer box 21 is connected to the cold energy storage unit 3 through the second conversion inlet and the second conversion outlet.

[0048] The cold energy storage unit 3 is a water storage tank, which can store circulating water inside. The tank body of the cold energy storage unit 3 is provided with a first circulation port group 31 and a second circulation port group 32. The first circulation port group 31 includes a first circulation inlet and a first circulation outlet.

[0049] The first circulation outlet of the first circulation port group 31 and the second circulation inlet of the second conversion port group 202 are connected through a pipeline; the first circulation inlet of the first circulation port group 31 and the second circulation outlet of the second conversion port group 202 are connected through a pipeline. The pipeline group formed between the first circulation port group 31 and the second conversion port group 202 is used to form a water circulation for collecting cold energy in the cold energy storage unit 3.

[0050] The heat exchange unit 4 utilizes the cold energy in the cold energy storage unit 3. Based on actual needs and the heat exchange structure of different processes, the heat exchange unit 4 is used to exchange the cold energy recovered from the cold energy storage unit 3 for heat in other processes. The second circulation port group 32 on the cold energy storage unit 3 includes a second circulation inlet and a second circulation outlet. The second circulation outlet communicates with the inlet of the heat exchange unit 4, and the second circulation inlet communicates with the outlet of the heat exchange unit 4. The pipeline group between the second circulation port group 32 and the heat exchange unit 4 forms a water circulation pipeline for outputting cold energy to the heat exchange unit 4.

[0051] With this solution, when cooling unit 1 delivers gas to external gas terminal 5, it passes through cold energy conversion unit 2, where it transfers the cold energy generated by the vaporization of the liquid to circulating water supplied by cold energy storage unit 3, which then collects the cold energy. When needed by heat exchange unit 4, cold energy storage unit 3 releases the low-temperature water within it to serve as coolant in heat exchange unit 4. This solution utilizes the cold energy generated by the vaporization of the low-temperature liquid to produce cooling circulating water for the process, effectively reducing water resource waste and lowering the energy consumption of circulating water refrigeration, thereby achieving energy conservation and environmental protection.

[0052] On the basis of the above embodiment, a first pump group 6 is arranged between the pipelines of the second conversion port group 202 and the first circulation port group 31. The first pump group 6 includes two pumps arranged in parallel. The two parallel pumps are arranged between the first circulation outlet of the first circulation port group 31 and the second conversion inlet of the second conversion port group 202.

[0053] The first circulation outlet of the first circulation port group 31 is arranged at the bottom of the tank body, and the first circulation outlet is arranged at the top of the tank body. The second circulation outlet of the second circulation port group 32 is also arranged at the bottom of the tank body, and the second circulation inlet is arranged at one side of the upper part of the tank body.

[0054] The first pump assembly 6 of this solution, with two pumps, provides a certain degree of adjustability in the circulating water speed while also preventing complete system failure due to pump failure when using only one pump. The tank inlet and outlet of the cold energy storage unit 3 of this solution are positioned in a circulation structure that optimizes cold energy storage and utilization.

[0055] Based on the above implementation plan, see Figures 2 to 4 The cold energy conversion unit 2 includes an outer frame, which is a rectangular frame. A main box 24 is provided inside the outer frame. The outer box 21, the inner box group 23 and the cold energy pipe 22 are provided inside the main box 24 in sequence from the outside to the inside. Figure 4 The main box 24 is hidden.

[0056] A drain groove is provided at the bottom of the outer frame, and the drain groove is communicated with the outside through a drain pipe 242. A drain hole is opened at the bottom of the main box 24 corresponding to the drain groove. Since it is considered that condensate may be generated on the outer surface of the outer box 21 of the cold energy conversion unit 2 during use, it is placed inside the main box 24. An inclined surface for guiding the flow is provided at the bottom of the main box 24, and the condensate can fall into the drain groove. At the same time, the main box 24 also protects the outer box 21 which is the main energy cycle structure. The upper part of the outer frame adopts a combined frame structure with detachable connection. A box cover is provided on the upper part of the main box 24, and an observation window is provided on the box cover.

[0057] Based on the above implementation, refer to Figure 5 , the inner box group 23 is arranged inside the outer box 21, and the inner box group 23 covers the outside of the cold energy pipe 22; refer to Figure 6 , the cold energy pipe 22 is in the shape of a serpentine coil, and its overall state is a rectangular array distribution, divided into multiple layers, and each layer is interconnected. The inner box group 23 has an inner box corresponding to each layer, and each layer is interconnected, and there is a gap between the inner box walls of each layer. A third conversion port group 203 is also provided on the outer box 21. The third conversion port group 203 includes a third conversion inlet and a third conversion outlet; the inner box group 23 is communicated with the heating unit through the third conversion port group 203.

[0058] Considering that the cold energy storage unit 3 uses water as the energy conversion medium, if the water directly contacts the outer wall of the cold energy pipe 22, ice may condense on the outer wall of the cold energy pipe 22. Over a long time, the ice layer may thicken, ultimately affecting the use of the cold energy conversion unit 2. Therefore, in this solution, the inner box group 23 is added to isolate the cold energy pipe 22 and water through the inner boxes of the inner box group 23, reducing the possibility of the above problems. In addition, if ice appears on the outer wall of the inner box, the supply of the heating unit can be turned on to introduce hot air or hot water into the inner box group 23 to adjust the temperature of the inner box group 23 and melt the ice on its outer wall. It is also possible to supply hot water at an appropriate temperature into the inner box group 23 to adjust the water temperature output from the entire cold energy conversion 2 to the cold energy storage unit 3.

[0059] Based on the above implementation, refer to Figure 1The heating unit in the aforementioned scheme can adopt an independent hot air or hot water supply unit, or the heat exchange unit 4 can be used as the heating unit, that is, the outlet end of the heat exchange unit 4 can be connected to the inner box group 23 through the third conversion inlet of the third conversion port group 203. Two branches are set at the outlet end of the heat exchange unit 4, one of which is directly connected to the cold energy storage unit 3, and the other is connected to the inner box group 23. Valves are set on the two branches respectively, and they can be opened according to actual needs. This scheme uses the water after heat exchange in the heat exchange unit 4 as the heat source, which can be passed through the inner box group 23 and then returned to the cold energy storage unit 3 when needed. If an ice layer appears on the outer wall of the inner box of the inner box group 23, other passages can be temporarily closed, or the output of the cooling unit 1 can be reduced to end the above method to melt the ice layer.

[0060] Based on the above embodiment, a heat storage tank 8 is provided on the pipeline corresponding to the third conversion outlet in the third conversion port group 203. A second pump group 7 is provided on the pipeline corresponding to the third conversion inlet in the third conversion port group 203. The second pump group 7 includes two pumps arranged in parallel, one of which is connected to the outlet of the heat exchange unit 4, and the other is an air pump. The heat storage tank 8 is an ordinary storage tank. Considering that if the water of the heat exchange unit 4 is injected into the inner box of the inner box group 23, if the heat exchange unit 4 does not have a high heat exchange demand during use, that is, the temperature of the circulating water output from its outlet is still very low, then the inner box group 23 may also have the problem of ice formation, and in serious cases, even the inlet and outlet may be blocked. Therefore, a second pump assembly 7 is provided. Once the defrosting operation is complete, the heat exchange unit 4 can be shut off from the cold energy storage unit 3, and the air pump can be turned on to inject air into the inner box of the inner box assembly 23, draining the water inside into the heat storage tank 8 or the cold energy storage unit 3. This allows air to serve as the heat transfer medium in the inner box assembly 23, thereby reducing the possibility of ice blocking its internal entrances and exits. It should be noted that the term "heat storage tank 8" does not necessarily mean that the water inside it is very hot; it is mainly used to distinguish it from the cold energy storage unit 3.

[0061] In the description of the present application and its embodiments, it should be understood that the terms "top", "bottom", "height", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0062] In this application and its embodiments, unless otherwise expressly specified or limited, terms such as "disposed," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0063] In the present application and its embodiments, unless otherwise expressly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0064] The disclosure above provides many different embodiments or examples for realizing the different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described above. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0065] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0066] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A cold energy utilization system for cryogenic liquefied gas, characterized in that, Comprising: A cooling unit, including a cooling liquid storage tank, in which liquefied gas is stored; A cold energy conversion unit, connected to the cooling unit and capable of performing cold energy exchange; A cold energy storage unit, connected to the cold energy conversion unit, and a recyclable cold energy path is formed between the cold energy storage unit and the cold energy conversion unit; A heat exchange unit, connected to the cold energy storage unit, and a recyclable heat exchange path is formed between the heat exchange unit and the cold energy storage unit.

2. The cryogenic liquefied gas cold energy utilization system according to claim 1, characterized in that The cold energy conversion unit includes: An outer box, a box body with a cavity inside; A cold energy pipe, arranged inside the outer box and being a coiled pipe.

3. The cryogenic liquefied gas cold energy utilization system according to claim 2, wherein The following are provided on the outer box: A first conversion port group, including a first conversion inlet and a first conversion outlet; the inlet end of the cold energy pipe is connected to the outlet end of the cooling unit through the first conversion inlet; the outlet end of the cold energy pipe is connected to the inlet end of an external gas-using terminal through the first conversion outlet; A second conversion port group, including a second conversion inlet and a second conversion outlet, and the outer box is connected to the cold energy storage unit through the second conversion inlet and the second conversion outlet.

4. The cryogenic liquefied gas cold energy utilization system according to claim 3, wherein, The cold energy storage unit is a storage tank, in which a liquid capable of performing cold energy exchange is stored; the cold energy storage unit includes: A first circulation port group, including a first circulation inlet and a first circulation outlet, and the first circulation port group and the second conversion port group are connected through a pipeline; the first circulation port group is used for the cold energy storage unit to collect cold energy; A second circulation port group, including a second circulation inlet and a second circulation outlet, and the second circulation port group is connected to the heat exchange unit; the second circulation port group is used to output cold energy to the heat exchange unit.

5. The cryogenic liquefied gas cold energy utilization system according to claim 4, characterized in that, It further includes: A first pump group, arranged between the pipelines of the second conversion port group and the first circulation port group.

6. The cryogenic liquefied gas cold energy utilization system according to claim 5, characterized in that, The first pump group is arranged on the pipeline corresponding to the first circulation inlet or the pipeline corresponding to the first circulation outlet of the first circulation port group; The first pump group includes two pump machines arranged in parallel.

7. The cold energy utilization system for cryogenic liquefied gas according to claim 6, wherein The cold energy conversion unit further includes: An inner box group, arranged inside the outer box, and the inner box group covers the outside of the cold energy pipe; The following are further provided on the outer box: A third conversion port group, including a third conversion inlet and a third conversion outlet; the inner box group is connected to a heating unit through the third conversion port group.

8. The cryogenic liquefied gas cold energy utilization system according to claim 7, wherein, The heating unit is a heat exchange unit, and the third conversion inlet of the third conversion port group is connected to the outlet end of the heat exchange unit.

9. The cold energy utilization system for cryogenic liquefied gas according to claim 8, characterized in that, It further includes: A heat storage tank, arranged on the pipeline corresponding to the third conversion outlet in the third conversion port group.

10. The cold energy utilization system of cryogenic liquefied gas according to claim 9, characterized in that, It further includes: A second pump group, arranged on the pipeline corresponding to the third conversion inlet in the third conversion port group; The second pump group includes two pump machines, one of which is connected to the outlet end of the heat exchange unit, and the other pump machine is an air pump.

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