A carbon dioxide low-temperature gas-liquid conversion-oriented storage and conversion integrated device and method

Abstract

The application discloses a kind of carbon dioxide low temperature gas-liquid conversion-oriented storage and conversion integrated device and method;The device includes cold storage tank body and working medium access assembly and transverse cold storage sheet.Multiple transverse cold storage sheets are sequentially spaced arrangement.Adjacent two transverse cold storage sheets form working medium cavity;The inside of transverse cold storage sheet is formed by blowing and expanding to form cold storage cavity;Multiple bulging units are formed by multiple junctions in the cold storage cavity.The position of the bulging unit of adjacent two transverse cold storage sheets is staggered.The cold storage cavity is filled with phase change cold storage material.The application forms the cold storage cavity and working medium cavity alternately arranged in tank body, which helps to improve the efficiency of cold storage cavity absorbing and releasing cold to working medium cavity, so the application can use the phase change cold storage material stored in cold storage cavity to promote gaseous carbon dioxide in input working medium cavity to be quickly liquefied, to realize the integration of carbon dioxide liquefaction equipment and storage equipment.

Description

Technical Field

[0001] This invention belongs to the field of energy storage technology, specifically relating to an integrated energy storage, heat exchange, and cooling device and method for low-temperature carbon dioxide gas-liquid conversion. Background Technology

[0002] In the context of rapid development of new energy sources, novel energy storage has become a key component in building new power systems. Storing energy through the liquefaction and vaporization of carbon dioxide can effectively address power shortages during peak demand periods. Furthermore, carbon dioxide energy storage technology boasts relatively high conversion efficiency, retaining more energy during the conversion of electrical energy into liquid carbon dioxide, thereby improving overall energy utilization efficiency. In addition, carbon dioxide has a high specific heat capacity, excellent heat transfer performance, lower parasitic energy consumption, and higher system efficiency. Therefore, liquid carbon dioxide energy storage possesses advantages such as ultra-long duration, large scale, high flexibility, high efficiency, and high energy density, making it a promising area for development.

[0003] Low-pressure CO2 liquefaction typically employs coil-type phase change energy storage devices. The structure of a coil-type phase change energy storage device is as follows: Figure 1 As shown in the diagram, the low-pressure CO2 from the expander outlet, after initial sensible heat cooling, enters the tube side of the coil-type phase change energy storage device. The phase change material located outside the tubes provides cooling for CO2 liquefaction. The liquefied CO2 is then pumped into a CO2 storage tank. During compression, CO2 is extracted from the storage tank, throttled and cooled, and enters the tube side of the energy storage device, where it evaporates and absorbs heat, transferring the cooling to the phase change material outside the tubes. This forms a cycle of phase change material cooling storage-release and working fluid vaporization-liquefaction. In the above method, cooling and liquid storage are handled in the phase change energy storage device and the CO2 storage tank, respectively. Alternatively, liquid CO2 can be directly stored in the phase change energy storage device. The liquefaction process is cooled by the phase change material. During vaporization, the pressure in the phase change energy storage device is reduced by a compressor, causing the liquid CO2 to evaporate at this pressure, simultaneously transferring the cooling to the phase change material outside the tubes and inducing a phase change.

[0004] Liquid CO2 evaporation utilizes the heat from the phase change material. To ensure effectiveness, the liquid CO2 needs to be in uniform contact with the phase change material (through the tube wall). In vertical coil-type phase change cold storage devices, the liquid tends to accumulate in the lower part of the tube, preventing the full utilization of the phase change material's heat during evaporation. This results in insufficient CO2 evaporation and a decreased utilization rate of the phase change material. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated storage and cooling device and method for low-temperature gas-liquid conversion of carbon dioxide.

[0006] In a first aspect, the present application provides a cold storage and conversion integrated device for low-temperature gas-liquid conversion of carbon dioxide, comprising a cold storage tank body, a working medium inlet and outlet assembly, and transversely arranged cold storage sheets. A plurality of transversely arranged cold storage sheets are arranged in sequence and spaced apart along the vertical direction in the cold storage tank body. A working medium cavity is formed between two adjacent transversely arranged cold storage sheets. The working medium inlet and outlet assembly is connected to the working medium cavity.

[0007] The interior of the transversely arranged cold storage sheet forms a cold storage cavity by blowing. A plurality of junction points are provided in the cold storage cavity. The two side walls of the cold storage cavity are connected together at each junction point. Each junction point forms a plurality of bulge units in the cold storage cavity that are connected to each other. The positions of the bulge units on the opposite sides of the two adjacent transversely arranged cold storage sheets are staggered with each other, forming an interlocking state. The cold storage cavity is filled with phase change cold storage material.

[0008] As a preferred embodiment, each junction point in the transversely arranged cold storage sheet is arranged in a diamond queue. A bulge unit is formed between four adjacent junction points arranged in a diamond.

[0009] As a preferred embodiment, the two adjacent transversely arranged cold storage sheets are a first cold storage sheet and a second cold storage sheet. The junction points on the first cold storage sheet are aligned with the peak points of the bulge units on the second cold storage sheet.

[0010] As a preferred embodiment, the bulge units of the two adjacent transversely arranged cold storage sheets do not contact each other, and the center distance between the two adjacent transversely arranged cold storage sheets is less than or equal to the thickness of the transversely arranged cold storage sheet at the peak point.

[0011] As a preferred embodiment, each junction point is arranged to form a plurality of first junction point queues and a plurality of second junction point queues arranged alternately at equal intervals. The distance between two adjacent junction points in a queue, the distance between two adjacent first junction point queues, and the distance between two adjacent second junction point queues are equal, and the value is denoted as l. The staggered distance between each junction point in the first junction point queue and each junction point in the second junction point queue is 0.5l.

[0012] As a preferred embodiment, a working medium inlet and outlet interface is provided at the same side edge of each working medium cavity. The working medium inlet and outlet assembly comprises a converging pipe and a branch pipe. The branch pipe is the same as the number of working medium cavities and corresponds one-to-one. The branch pipe is connected between the converging pipe and the corresponding working medium cavity.

[0013] As a preferred embodiment, the transversely arranged cold storage sheet comprises two side plates. The four peripheral edges of the two side plates are sealingly connected. The two side plates are attached and fixed at each junction point. The transversely arranged cold storage sheet is provided with a material filling interface for blowing operation and inputting phase change cold storage material. The material filling interface is closed after inputting the phase change cold storage material.

[0014] In a second aspect, the present application provides a method for integrated storage and conversion of carbon dioxide, which uses the aforementioned integrated storage and conversion device for carbon dioxide.

[0015] The method for integrated storage and conversion of carbon dioxide includes a storage liquefaction method and a gasification extraction method.

[0016] The storage liquefaction method includes:

[0017] The carbon dioxide gas working medium is input into each working medium cavity through the working medium inlet and outlet assembly. The pressure in the working medium cavity increases, and the gas working medium absorbs the cold energy of the phase change cold storage material, and is liquefied on the upper surface of the working medium cavity with the concave-convex structure, and is gathered and dropped under the action of gravity and then laid in the working medium cavity until the liquid carbon dioxide storage is completed.

[0018] The gasification extraction method includes:

[0019] The carbon dioxide gas working medium is sucked from each working medium cavity through the working medium inlet and outlet assembly, so that the pressure in the working medium cavity decreases, and the saturation evaporation temperature of the liquid working medium decreases to below the phase change temperature of the phase change cold storage material. The liquid working medium is gasified to continuously generate gaseous working medium output. The cold energy generated by gasification is absorbed by the phase change cold storage material.

[0020] As a preferred, the condition for saturation of liquid carbon dioxide storage is that the liquid surface of the liquid working medium just touches the bulge unit on the upper surface of the working medium cavity. Avoiding the decrease of heat exchange efficiency, which leads to the difficulty in timely completing the liquefaction of carbon dioxide.

[0021] In a third aspect, the present application provides an optimization method for an integrated storage and conversion device for carbon dioxide, which is used to optimize the aforementioned integrated storage and conversion device for carbon dioxide.

[0022] The optimization method includes:

[0023] The volume ratio constraint condition between the target storage volume of the liquid carbon dioxide working medium of the working medium cavity and the storage volume of the phase change cold storage material of the cold storage cavity is as follows:

[0024] V g / V p ≤(ρ p ·λ p ) / (ρ g ·λg)

[0025] Wherein, V g , V p are the target storage volume of the liquid carbon dioxide working medium and the volume of the phase change cold storage material, respectively; ρ g , ρ pDensity of carbon dioxide working medium, phase change cold storage material respectively; λ g , λ p Latent heat value of carbon dioxide working medium, phase change cold storage material respectively.

[0026] According to the volume ratio constraint condition, the density of the junction points on the transverse cold storage sheet is adjusted, and the center distance between the adjacent first cold storage sheet and the second cold storage sheet is adjusted, so that the cold storage and exchange integrated device facing the carbon dioxide low-temperature gas-liquid conversion meets the volume ratio constraint condition.

[0027] As preferred, the target storage volume of the liquid carbon dioxide working medium in a single working medium cavity is the volume of the liquid carbon dioxide working medium when the liquid surface of the liquid carbon dioxide working medium just completely covers the bulge unit of the lower surface of the working medium cavity.

[0028] As preferred, the volume ratio V g / V p The greater, the more dense the junction points are set, and the smaller the bulge unit height is.

[0029] The present application has the following beneficial effects.

[0030] 1. The present application forms a plurality of cold storage cavities and a plurality of working medium cavities in the tank body along the vertical direction by arranging the blow-molded transverse cold storage sheet in multiple layers; the multiple-layer alternating structure helps to improve the efficiency of the cold storage cavity in absorbing and releasing cold energy to the working medium cavity, so that the present application can use the phase change cold storage material stored in the cold storage cavity to promote the rapid liquefaction of the gaseous carbon dioxide input into the working medium cavity, realize the integration of the carbon dioxide liquefaction equipment and the storage equipment, and save the structure of the liquid storage tank, the liquid pump and the pipeline, thereby reducing the system complexity and the structure cost.

[0031] 2. The present application forms a plurality of bulge units arranged uniformly on the blow-molded transverse cold storage sheet by arranging the junction points in a diamond array in the transverse cold storage sheet; compared with the flat plate structure, the bulge units significantly increase the heat exchange area between the cold storage cavity and the working medium cavity, improve the speed of the phase change cold storage material in providing cold energy when liquefying carbon dioxide and absorbing cold energy when gasifying carbon dioxide, and improve the efficiency of carbon dioxide liquefaction storage and gasification output.

[0032] 3. The present application forms the bulge units on the adjacent transverse cold storage sheets in a staggered arrangement, so that the bulge units on the adjacent transverse cold storage sheets are staggered and engaged, the height and volume of the working medium cavity between the adjacent transverse cold storage sheets are reduced, more layers of working medium cavities are arranged in the same tank body height, the contact area between the phase change cold storage material and the carbon dioxide working medium is increased, and the efficiency of carbon dioxide liquefaction and gasification is further improved.

[0033] 4. The working medium input and output assembly in the application is in gaseous state, and is liquefied after entering each working medium cavity, the resistance of each branch is equivalent, the uniformity of the distribution and convergence is high, the uneven distribution of each cavity can be avoided, the uniform heat release and heat absorption of each layer of phase change cold storage material is promoted, and the utilization rate of the phase change cold storage material is improved.

[0034] 5. The liquid carbon dioxide and the phase change cold storage material are stored in the groove body together, so that the liquid carbon dioxide is not easy to evaporate due to the absorption of heat from the environment, and the overpressure condition is avoided.

[0035] 6. In the application, the multiple cold storage cavities and the multiple working medium cavities are alternately stacked and uniformly contacted through the wall surface, compared with the disc tube type cold storage device, the carbon dioxide working medium can uniformly contact the phase change material through the wall surface, the heat exchange capacity and the gasification rate are relatively constant, and the utilization rate of the phase change material is higher. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the existing disc tube type phase change cold storage device;

[0037] Figure 2 It is a schematic diagram of the internal structure of embodiment 1 of the application;

[0038] Figure 3 It is a sectional view of the transversely placed cold storage sheet 2 in embodiment 1 of the application;

[0039] Figure 4 It is a schematic diagram of the first cold storage sheet in embodiment 1 of the application;

[0040] Figure 5 It is a schematic diagram of the section where the first joint point queue of the first cold storage sheet in embodiment 1 of the application is located (i.e. the schematic diagram of the A-A section in the figure); Figure 4

[0041] Figure 6 It is a schematic diagram of the section where the second joint point queue of the first cold storage sheet in embodiment 1 of the application is located (i.e. the schematic diagram of the B-B section in the figure); Figure 4

[0042] Figure 7 It is a schematic diagram of the second cold storage sheet in embodiment 1 of the application;

[0043] Figure 8 It is a schematic diagram of the storage liquefaction process in embodiment 1 of the application;

[0044] Figure 9 It is a schematic diagram of the gasification extraction process in embodiment 1 of the application;

[0045] Figure 10 It is a schematic diagram of the interface bubble generation in the gasification extraction process in embodiment 1 of the application (i.e. the schematic diagram of the C-C section in the figure); Figure 9 ​​(A magnified view of part C in the middle).

[0046] Reference numerals in the attached drawings: 1. Cold storage tank; 2. Horizontal cold storage plate; 2-1. Connection point; 2-2. Bulging unit; 2-2-1. Peak point; 2-3. Material filling interface; 2-4. Sealing structure; 3. Cold storage cavity; 4. Working fluid cavity; 5. Manifold; 6. Branch pipe. Detailed Implementation

[0047] The present invention will be further described below with reference to the accompanying drawings.

[0048] Example 1

[0049] like Figure 2 As shown, an integrated cold storage and heat exchange device for low-temperature carbon dioxide gas-liquid conversion includes a cold storage tank 1, horizontally placed cold storage plates 2, and a working fluid inlet / outlet assembly. The horizontally placed cold storage plates 2 are arranged horizontally. Multiple horizontally placed cold storage plates 2 are arranged sequentially at intervals along the vertical direction within the cold storage tank 1.

[0050] like Figure 3 and Figure 4 As shown, the horizontally placed cold storage plate 2 is formed by inflation and includes two side plates. The two side plates are aligned with each other and sealed together at their edges. Multiple connection points 2-1 are provided between the two side plates. The two side plates are attached and fixed together at each connection point 2-1. The interior of the horizontally placed cold storage plate 2 contains a cold storage cavity 3 formed by inflation. A material filling port 2-3 is provided at the edge of the horizontally placed cold storage plate 2. The material filling port 2-3 is used for the inflation operation and for filling the inflation-formed cold storage cavity 3 with phase change cold storage material after inflation. The working fluid is carbon dioxide.

[0051] like Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the multiple connection points 2-1 in the horizontally placed cold storage plate 2 are arranged in a diamond-shaped queue. Specifically, the connection points 2-1 are arranged to form multiple first connection point queues and multiple second connection point queues. Both the first and second connection point queues include multiple connection points 2-1 arranged at equal intervals. The multiple first connection point queues and the multiple second connection point queues are arranged alternately at equal intervals. The connection points 2-1 in the first connection point queues and the connection points 2-1 in the second connection point queues are staggered along the direction of their arrangement within the queue.

[0052] In some embodiments, the distance between two adjacent junctions 2-1 in a queue, the distance between two adjacent first junction queues, and the distance between two adjacent second junction queues are equal, denoted as l. The offset between each junction 2-1 in the first junction queue and each junction 2-1 in the second junction queue is 0.5l.

[0053] In some further embodiments, the transverse cold storage sheet 2 is rectangular. Each junction 2-1 forms a matrix arrangement with an angle of 45°.

[0054] Figure 5 、 6 The cross sections corresponding to the first junction queue and the second junction queue are shown respectively. It can be observed that the cross section is divided into junctions 2-1 and bulge regions, which alternate.

[0055] Four adjacent junctions 2-1 arranged in a diamond shape form a bulge unit 2-2. The most convex point of the bulge unit 2-2 is called the bulge peak point 2-2-1 of the bulge unit 2-2. The four adjacent junctions 2-1 that enclose the bulge unit 2-2 are called the bulge valley points of the bulge unit 2-2. The bulge peak point 2-2-1 is located at the center position between the corresponding four bulge valley points. Each bulge unit 2-2 is connected to form a complete cold storage cavity 3. The size and height of the bulge unit 2-2 change with the arrangement density of the junctions 2-1.

[0056] The transverse cold storage sheet 2 is divided into two types, namely a first cold storage sheet and a second cold storage sheet. A plurality of first cold storage sheets and a plurality of second cold storage sheets are arranged alternately at equal intervals. The arrangement positions of the junctions 2-1 on the first cold storage sheet and the second cold storage sheet are staggered with each other, so that each bulge peak point 2-2-1 on the first cold storage sheet is aligned with each bulge valley point on the second cold storage sheet, and the bulge units 2-2 on the first cold storage sheet and the second cold storage sheet form a state of interlocking engagement.

[0057] The bulge units 2-2 on the first cold storage sheet and the second cold storage sheet do not contact each other. The center distance between adjacent first cold storage sheets and second cold storage sheets is less than the thickness of the bulge peak point 2-2-1 position of the transverse cold storage sheet 2 (i.e. the distance between the two bulge peak points 2-2-1 on the same bulge unit 2-2), ensuring that there is still a horizontal plane intersecting the bulge units 2-2 of the adjacent first cold storage sheet and the second cold storage sheet, avoiding a completely separated state of interlocking engagement between the first cold storage sheet and the second cold storage sheet.

[0058] Adjacent transverse cold storage sheets 2 form a working medium cavity 4. A plurality of transverse cold storage sheets 2 form a plurality of cold storage cavities 3 and working medium cavities 4 arranged alternately and not connected to each other inside the cold storage tank 1.

[0059] The cold storage chamber 3 is completely sealed after being filled with phase change cold storage material. Each working fluid chamber 4 has a working fluid inlet / outlet port on the same side edge. The working fluid chamber 4 is used for the exothermic liquefaction and endothermic vaporization of the working fluid.

[0060] The working fluid inlet / outlet assembly includes a manifold 5 and branch pipes 6. The number of branch pipes 6 is the same as the number of working fluid chambers 4, and they correspond one-to-one. One end of each branch pipe 6 is fixed and connected to the working fluid inlet / outlet interface of the corresponding working fluid chamber 4. The other end of each branch pipe 6 is fixed and connected to the manifold 5. The manifold 5 is used to input or extract liquid working fluid into or from the working fluid chamber 4. The manifold 5 is connected to the external carbon dioxide energy storage device of the integrated storage and exchange cooling device for low-temperature carbon dioxide gas-liquid conversion.

[0061] In some embodiments, the horizontally placed cold storage plate 2 is prepared by a blow-blowing process. The preparation process is as follows: two side plates are stacked together, and the connection points 2-1 are welded and fixed. The four edges are welded to form a sealing structure 2-4, with a short welded tube reserved. This short tube is used for blow-blowing and filling with phase change material. High-pressure gas or liquid is used for blow-blowing, and the area between the two side plates, except for the welded positions, bulges and deforms to form a continuous internal space with periodic undulations on the sides (i.e., the cold storage cavity 3).

[0062] The working method of the integrated storage, exchange, and cooling device for low-temperature carbon dioxide gas-liquid conversion includes a storage liquefaction method and a gasification extraction method.

[0063] like Figure 8 As shown, the process of storing the liquefaction product is as follows:

[0064] Carbon dioxide gas is introduced into the manifold 5; the gas enters each working fluid chamber 4 through the branch pipes 6. The pressure inside the working fluid chamber 4 increases, and the gas absorbs the cooling energy of the phase change cooling material through the wall of the horizontally placed cold storage plate 2. It condenses and liquefies on the upper surface (i.e., the lower surface of the horizontally placed cold storage plate 2 on the upper layer of the working fluid chamber 4) and the lower surface (i.e., the upper surface of the horizontally placed cold storage plate 1 on the lower layer of the working fluid chamber 4) with the uneven structure. The liquid condensed on the upper surface gathers and drips under the action of gravity, and deposits together with the liquid condensed on the lower surface in the depression of the lower surface. The deposited liquid continuously gathers and the liquid level continuously rises.

[0065] In some preferred embodiments, the liquid level of the liquid working medium just touches the bulging unit 2-2 on the upper surface of the working medium cavity 4, and the liquefaction is completed, and the gaseous carbon dioxide is stopped from being continuously input. The reason for setting this saturation condition is that the upper surface of the working medium cavity 4 is directly in contact with the gaseous carbon dioxide and bears the main heat exchange function; therefore, when the liquid working medium contacts the bulging unit on the upper surface of the working medium cavity 4, the heat exchange efficiency will be significantly reduced, and the efficiency of continuously storing carbon dioxide is low. At this time, the liquid carbon dioxide storage is saturated, and the liquid level of the liquid working medium is flush with the peak point 2-2-1 of the bulging unit 2-2 on the lower surface of the working medium cavity 4.

[0066] As shown in Figure 9 and Figure 10 , the process of the gasification extraction method is as follows:

[0067] The carbon dioxide gas working medium is sucked from each working medium cavity 4 through the manifold 5, so that the pressure in the working medium cavity 4 is reduced, the saturation evaporation temperature of the liquid working medium is lowered, and it is lower than the phase change temperature of the phase change cold storage material. At this time, the liquid working medium absorbs the heat of the phase change cold storage material and evaporates, thereby continuously generating gaseous working medium and storing cold to the phase change cold storage material. The continuously generated gaseous working medium continues to be outputted to the outside through the working medium inlet and outlet assembly. At the same time, the interface between the liquid working medium and the transversely placed cold storage sheet 2 will produce bubbles due to the outstanding heat exchange effect, thereby improving the gasification efficiency.

[0068] In the process of the storage liquefaction method, the liquid working medium is evenly laid on the transversely placed working medium cavity 4, which can uniformly exchange heat with the phase change cold storage material, so that the evaporation amount and vapor pressure of carbon dioxide are stable.

[0069] The present embodiment can not only be used in the field of carbon dioxide energy storage, but also be used in other scenarios that require working medium liquefaction and gasification.

[0070] Embodiment 2

[0071] An optimization method of a carbon dioxide low-temperature gas-liquid conversion integrated storage and exchange cold device, the process is as follows:

[0072] Step one, establish the constraint condition between the target storage volume of the liquid carbon dioxide working medium of the working medium cavity 4 and the storage volume V p of the cold storage cavity 3. The target storage volume of the liquid carbon dioxide working medium represents the volume of the liquid carbon dioxide working medium in the working medium cavity 4 when the liquid level of the liquid carbon dioxide working medium contacts the peak point of the bulging unit on the upper surface of the working medium cavity 4.

[0073] Since the working medium cavity 4 cannot be filled with liquid carbon dioxide working medium, the target storage volume V g of the liquid carbon dioxide working medium is less than the volume V sIn some embodiments, the target storage volume of the liquid carbon dioxide working medium in a single working medium cavity is the volume of the liquid carbon dioxide working medium when the liquid level of the liquid carbon dioxide working medium just reaches the bulge unit below the lower surface of the working medium cavity.

[0074] According to the phase change volume change rate of the phase change cold storage material, the filling rate of the phase change material in the cavity 3 is determined; therefore, the storage volume V p of the cold storage cavity 3 is less than or equal to the volume of the cold storage cavity 3, and specifically, the ratio between the storage volume and the volume is equal to the filling rate. The cold quantity required for liquefaction of the gaseous carbon dioxide in a working medium cavity 4 is provided by half of the cold quantity from each of the cold storage cavities 3 on both sides of the working medium cavity 4; therefore, a simplified analysis is performed: during the process of completing a round of carbon dioxide liquefaction storage, the cold quantity required for liquefaction of the gaseous carbon dioxide in the working medium cavity 4 is less than or equal to the phase change cold storage quantity of a cold storage cavity 3, and preferably equal to the phase change cold storage quantity of a cold storage cavity 3.

[0075] Therefore, the constraint conditions of the parameters are established as follows:

[0076] ρ g ·V g ·λ g ≤ρ p ·V p ·λ p

[0077] Wherein, ρ g , ρ p are the densities of the carbon dioxide working medium and the phase change cold storage material, respectively; λ g , λ p are the latent heat values of the carbon dioxide working medium and the phase change cold storage material, respectively; V g , V p are the target storage volume of the liquid carbon dioxide working medium and the volume of the phase change cold storage material, respectively.

[0078] The above constraint condition is preferably ρ g ·V g ·λ g =ρ p ·V p ·λ p .

[0079] The above preferred constraint condition is deformed to obtain the volume ratio constraint condition of the carbon dioxide working medium and the phase change cold storage material as follows:

[0080] V g / V p ≤(ρ p ·λ p ) / (ρ g ·λg)

[0081] Step two, adjust the density of the junction points 2-1 on the transverse cold storage sheet 2 and the center distance between the adjacent first and second cold storage sheets according to the volume ratio constraint obtained in step one, so that the carbon dioxide low-temperature gas-liquid conversion integrated device meets the above-mentioned volume ratio constraint. Specifically, the more dense the junction points are, the smaller the height of the bulge is, and the storage volume V p of the cold storage cavity 3 is also smaller; under the condition of meeting the strength of the cold storage sheet, the higher the blow-up pressure is, the greater the height of the bulge is, and the storage volume V p of the cold storage cavity 3 is greater. Therefore, the greater the volume ratio V g / V p , the more dense the junction points are set, and the smaller the height of the bulge unit is.

Claims

1. A cold storage and heat exchange integrated device for low-temperature carbon dioxide gas-liquid conversion, comprising a cold storage tank (1) and a working fluid inlet / outlet assembly; characterized in that: It also includes horizontally placed cold storage plates (2); multiple horizontally placed cold storage plates (2) are arranged sequentially at intervals along the vertical direction in the cold storage tank (1); a working fluid cavity (4) is formed between two adjacent horizontally placed cold storage plates (2); the working fluid inlet and outlet assembly is connected to the working fluid cavity (4); The interior of the horizontally placed cold storage plate (2) is inflated to form a cold storage cavity (3); the cold storage cavity (3) is provided with multiple connection points; the two side walls of the cold storage cavity (3) are connected together at each connection point; each connection point makes multiple interconnected bulge units (2-2) form in the cold storage cavity (3); the bulge units (2-2) on opposite sides of two adjacent horizontally placed cold storage plates (2) are staggered; the cold storage cavity (3) is filled with phase change cold storage material.

2. The integrated storage and cooling device for low-temperature carbon dioxide gas-liquid conversion according to claim 1, characterized in that: The connection points (2-1) in the horizontally placed cold storage plate (2) are arranged in a diamond-shaped queue; a bulge unit (2-2) is formed between four adjacent connection points (2-1) arranged in a diamond shape.

3. The integrated storage, heat exchange, and cooling device for low-temperature carbon dioxide gas-liquid conversion according to claim 2, characterized in that: The two adjacent horizontally placed cold storage plates (2) are the first cold storage plate and the second cold storage plate, respectively; the connection point (2-1) on the first cold storage plate is aligned with the peak point (2-2-1) of the bulge unit (2-2) on the second cold storage plate.

4. The integrated storage and cooling device for low-temperature carbon dioxide gas-liquid conversion according to claim 2, characterized in that: The bulging units (2-2) of two adjacent horizontally placed cold storage plates (2) do not contact each other, and the center distance between two adjacent horizontally placed cold storage plates (2) is less than or equal to the thickness of the horizontally placed cold storage plate (2) at the bulging point (2-2-1).

5. The integrated storage and cooling device for low-temperature carbon dioxide gas-liquid conversion according to claim 2, characterized in that: Each link (2-1) is arranged to form multiple queues of first link points and multiple queues of second link points, which are arranged alternately at equal intervals. The distance between two adjacent link points (2-1) in a queue, the distance between two adjacent queues of first link points, and the distance between two adjacent queues of second link points are equal and are denoted as l. The offset between each link point (2-1) in the first link point queue and each link point (2-1) in the second link point queue is 0.5l.

6. The integrated storage and cooling device for low-temperature carbon dioxide gas-liquid conversion according to claim 1, characterized in that: Each working medium cavity (4) has a working medium inlet / outlet interface on the same side edge; the working medium inlet / outlet assembly includes a manifold (5) and a branch pipe (6); the number of branch pipes (6) is the same as the number of working medium cavities (4) and they correspond one-to-one; the branch pipes (6) are connected between the manifold (5) and the corresponding working medium cavity (4).

7. The integrated storage and cooling device for low-temperature carbon dioxide gas-liquid conversion according to claim 1, characterized in that: The horizontally placed cold storage plate (2) includes two side plates; the four edges of the two side plates are sealed and connected; the two side plates are attached and fixed at each connection point (2-1); the horizontally placed cold storage plate (2) is provided with a material filling interface (2-3) for blowing operation and input of phase change cold storage material; the material filling interface (2-3) is closed after the phase change cold storage material is input.

8. A method for integrated storage, heat exchange, and cooling for cryogenic carbon dioxide gas-liquid conversion, characterized in that: Using the integrated storage, heat exchange, and cooling device for low-temperature carbon dioxide gas-liquid conversion as described in claim 1; The integrated storage, exchange, and cooling method for low-temperature carbon dioxide gas-liquid conversion includes a storage-to-liquefaction method and a gasification-to-extraction method. The liquefaction storage method includes: Carbon dioxide gas working medium is input into each working medium cavity (4) through the working medium inlet and outlet component; the pressure inside the working medium cavity (4) increases, the gas working medium absorbs the cold energy of the phase change cold storage material, and liquefies on the upper surface of the working medium cavity (4) with an uneven structure. Under the action of gravity, it gathers and drips down and spreads flat inside the working medium cavity (4) until the liquid carbon dioxide storage is completed. The gasification extraction method includes: Carbon dioxide gas working fluid is drawn from each working fluid cavity (4) by the working fluid inlet and outlet components, which reduces the pressure inside the working fluid cavity (4) and lowers the saturated evaporation temperature of the liquid working fluid to below the phase change temperature of the phase change storage material; the liquid working fluid absorbs heat and vaporizes to continuously generate gaseous working fluid for external output; the cooling generated by vaporization is absorbed by the phase change storage material.

9. The integrated storage, heat exchange, and cooling method for low-temperature carbon dioxide gas-liquid conversion according to claim 8, characterized in that: The condition for liquid carbon dioxide storage saturation is that the liquid surface of the working medium just touches the bulging unit (2-2) on the upper surface of the working medium cavity (4).

10. An optimization method for an integrated storage, heat exchange, and cooling device for cryogenic carbon dioxide gas-liquid conversion, characterized in that: This is used to optimize the integrated storage, heat exchange, and cooling device for low-temperature carbon dioxide gas-liquid conversion as described in claim 1. The optimization method includes: The volume ratio constraint between the target storage volume of liquid carbon dioxide working fluid in the working fluid cavity (4) and the storage volume of phase change cold storage material in the cold storage cavity (3) is as follows: V g / V p ≤(ρ p ·l p ) / (ρ g ·λg) Among them, V g V p These represent the target storage volume of liquid carbon dioxide working fluid and the volume of phase change cold storage material, respectively; ρ g ρ p The densities of carbon dioxide working fluid and phase change cold storage material are respectively; λ g , λ p These are the latent heat values ​​of carbon dioxide working fluid and phase change cold storage material, respectively. Adjust the density of the connection points (2-1) on the horizontally placed cold storage plate (2) and the center distance between adjacent first and second cold storage plates according to the volume ratio constraint, so that the integrated cold storage and heat exchange device for low-temperature gas-liquid conversion of carbon dioxide meets the volume ratio constraint.

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