Cold storage and exchange integrated device and method for low-temperature gas-liquid conversion of carbon dioxide

Abstract

The invention discloses a cold storage and exchange integrated device and method for carbon dioxide low-temperature gas-liquid conversion. The device comprises a cold storage tank body, a working medium inlet and outlet assembly and a transverse cold storage sheet. And the plurality of transverse cold storage sheets are sequentially arranged at intervals. A working medium cavity is formed between every two adjacent transversely-arranged cold storage pieces. A cold storage cavity is formed in the transverse cold storage sheet through blowing; a plurality of connecting points are arranged in the cold storage cavity; and the cold storage cavity forms a plurality of bulge units which are communicated with one another through connecting points. The positions of the bulge units of every two adjacent transversely-arranged cold storage pieces are staggered. And the cold storage cavity is filled with a phase change cold storage material. The cold storage cavities and the working medium cavities which are alternately arranged are formed in the tank body, so that the efficiency of absorbing and releasing cold energy of the working medium cavities by the cold storage cavities is improved, and gaseous carbon dioxide input into the working medium cavities can be quickly liquefied by utilizing the phase change cold storage materials stored in the cold storage cavities; and integration of liquefaction equipment and storage equipment of carbon dioxide is realized.

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 invention provides an integrated cold storage and heat exchange device for cryogenic gas-liquid conversion of carbon dioxide, comprising a cold storage tank, a working fluid inlet / outlet assembly, and horizontally arranged cold storage plates. Multiple horizontally arranged cold storage plates are arranged sequentially at intervals along a vertical direction within the cold storage tank. A working fluid cavity is formed between two adjacent horizontally arranged cold storage plates; the working fluid inlet / outlet assembly is connected to the working fluid cavity.

[0007] The interior of the horizontally placed cold storage plate is inflated to form a cold storage cavity; the cold storage cavity has multiple connection points; the two side walls of the cold storage cavity are connected together at each connection point. These connection points create multiple interconnected bulge units within the cold storage cavity. The bulge units on opposite sides of two adjacent horizontally placed cold storage plates are staggered, forming an interlocking structure. The cold storage cavity is filled with a phase change cold storage material.

[0008] Preferably, the connection points in the horizontally placed cold storage plate are arranged in a diamond-shaped array; a bulge unit is formed between four adjacent connection points arranged in a diamond shape.

[0009] Preferably, two adjacent horizontally placed cold storage plates are designated as the first cold storage plate and the second cold storage plate. The connection points on the first cold storage plate are aligned with the peak points of the bulge units on the second cold storage plate.

[0010] Preferably, the bulge units of two adjacent horizontally placed cold storage plates do not contact each other, and the center distance between two adjacent horizontally placed cold storage plates is less than or equal to the thickness of the horizontally placed cold storage plate at the bulge point.

[0011] Preferably, the nodes are arranged to form multiple queues of first nodes and multiple queues of second nodes, which are alternately arranged at equal intervals. The distance between two adjacent nodes in a queue, the distance between two adjacent queues of first nodes, and the distance between two adjacent queues of second nodes are equal and denoted as l. The offset between each node in the first queue and each node in the second queue is 0.5l.

[0012] Preferably, each working fluid chamber has a working fluid inlet / outlet interface on the same side edge. The working fluid inlet / outlet assembly includes a manifold and branch pipes. The number of branch pipes is the same as the number of working fluid chambers, and they correspond one-to-one. The branch pipes connect the manifold and the corresponding working fluid chamber.

[0013] Preferably, the horizontally placed cold storage plate includes two side plates. The four edges of the two side plates are sealed together. The two side plates are attached and fixed at each connection point. The horizontally placed cold storage plate is provided with a material filling interface for inflation and input of phase change cold storage material. The material filling interface is closed after the phase change cold storage material is input.

[0014] Secondly, the present invention provides an integrated storage and cooling method for low-temperature gas-liquid conversion of carbon dioxide, which uses the aforementioned integrated storage and cooling device for low-temperature gas-liquid conversion of carbon dioxide.

[0015] The integrated storage, exchange, and cooling method for low-temperature carbon dioxide gas-liquid conversion includes a storage liquefaction method and a gasification extraction method.

[0016] The liquefaction storage method includes:

[0017] Carbon dioxide gas is introduced into each working fluid chamber through the working fluid inlet / outlet assembly. The pressure inside the working fluid chamber increases, and the gas absorbs the cooling energy of the phase change cold storage material. It then liquefies on the upper surface of the working fluid chamber, which has an uneven structure. Under the action of gravity, it gathers and drips down, spreading evenly inside the working fluid chamber until the liquid carbon dioxide storage is completed.

[0018] The gasification extraction method includes:

[0019] Carbon dioxide gaseous working fluid is drawn from each working fluid chamber through the working fluid inlet / outlet assembly, reducing the pressure within the working fluid chamber and lowering the saturation evaporation temperature of the liquid working fluid below the phase change temperature of the phase change storage material. The liquid working fluid absorbs heat and vaporizes, continuously generating gaseous working fluid for external output. The cooling energy generated by vaporization is absorbed by the phase change storage material.

[0020] Preferably, the liquid level of the working fluid is just touching the bulge unit on the upper surface of the working fluid chamber as the condition for liquid carbon dioxide storage saturation. This avoids a decrease in heat exchange efficiency, which could lead to difficulties in timely carbon dioxide liquefaction.

[0021] Thirdly, the present invention provides an optimization method for an integrated storage and cooling device for low-temperature gas-liquid conversion of carbon dioxide, which is used to optimize the aforementioned integrated storage and cooling device for low-temperature gas-liquid conversion of carbon dioxide.

[0022] The optimization method includes:

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

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

[0025] 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 pThe 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.

[0026] Adjusting the density of connection points on the horizontally placed cold storage plates 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 carbon dioxide gas-liquid conversion meets the volume ratio constraint.

[0027] Preferably, the target storage volume of liquid carbon dioxide working fluid in a single working fluid chamber is the volume of liquid carbon dioxide working fluid when the liquid surface of the liquid carbon dioxide working fluid just completely covers the bulge unit on the lower surface of the working fluid chamber.

[0028] As a preferred option, the volume ratio V g / V p The larger the value, the denser the connection points and the smaller the height of the bump unit.

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

[0030] 1. This invention uses multi-layered, spaced-apart, inflatable, horizontally placed cold storage plates to form multiple cold storage cavities and multiple working fluid cavities arranged alternately in the vertical direction within the tank. The multi-layered, alternating structure helps improve the efficiency of the cold storage cavities in absorbing and releasing cold energy from the working fluid cavities. Therefore, this invention can utilize the phase change cold storage material stored in the cold storage cavities to promote the rapid liquefaction of gaseous carbon dioxide in the input working fluid cavities, realizing the integration of carbon dioxide liquefaction equipment and storage equipment, eliminating the need for storage tanks, liquid pumps, pipelines, and other structures, thus reducing system complexity and structural costs.

[0031] 2. This invention arranges a diamond-shaped array of connection points in the horizontally placed cold storage plate, thereby forming multiple uniformly arranged bulging units on the inflated horizontally placed cold storage plate. Compared with a flat plate structure, these bulging units significantly increase the heat exchange area between the cold storage cavity and the working fluid cavity, improve the speed at which the phase change cold storage material provides cooling capacity during carbon dioxide liquefaction and absorbs cooling capacity during carbon dioxide vaporization, and improve the efficiency of carbon dioxide liquefaction storage and vaporization output.

[0032] 3. The present invention uses an alternating arrangement of bulging units on adjacent horizontally placed cold storage plates to make the bulging units on adjacent horizontally placed cold storage plates interlock, thereby reducing the height and volume of the working fluid cavity between adjacent horizontally placed cold storage plates. This allows for the setting of more layers of working fluid cavity at the same tank height, increasing the contact area between the phase change cold storage material and the carbon dioxide working fluid, and further improving the efficiency of carbon dioxide liquefaction and gasification.

[0033] 4. In this invention, the working fluid entering and exiting the component is in a gaseous state and only liquefies after entering each working fluid cavity. The resistance of each branch is relatively equal, and the uniformity of flow distribution and convergence is high. This can avoid the occurrence of uneven flow distribution in each chamber, promote uniform heat release and absorption of each layer of phase change cold storage material, and improve the utilization rate of phase change cold storage material.

[0034] 5. In this invention, liquid carbon dioxide and phase change cold storage material are stored together in a tank, which makes it less likely for liquid carbon dioxide to evaporate due to absorbing heat from the environment and cause overpressure.

[0035] 6. In this invention, the multiple cold storage chambers and multiple working fluid chambers stacked alternately are in uniform contact with each other through the wall surface. Compared with coil-type cold accumulators, carbon dioxide working fluid can be in uniform contact with phase change material through the wall surface, resulting in a more constant heat exchange capacity and vaporization rate, and a higher utilization rate of phase change material. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of an existing coil-type phase change cold storage device.

[0037] Figure 2 This is a schematic diagram of the internal structure of Embodiment 1 of the present invention;

[0038] Figure 3 This is a three-dimensional cross-sectional view of the horizontally placed cold storage plate 2 in Embodiment 1 of the present invention;

[0039] Figure 4 This is a schematic diagram of the first cold storage plate in Embodiment 1 of the present invention;

[0040] Figure 5 This is a schematic diagram of the cross-section of the first connection point queue of the first cold storage plate in Embodiment 1 of the present invention (i.e., Figure 4 (Schematic diagram of section AA)

[0041] Figure 6 This is a schematic diagram of the cross-section of the second connection point queue of the first cold storage plate in Embodiment 1 of the present invention (i.e., Figure 4 (Schematic diagram of the BB section)

[0042] Figure 7 This is a schematic diagram of the second cold storage plate in Embodiment 1 of the present invention;

[0043] Figure 8 This is a schematic diagram of the liquefaction process in Embodiment 1 of the present invention;

[0044] Figure 9 This is a schematic diagram of the gasification extraction process in Embodiment 1 of the present invention;

[0045] Figure 10 This is a schematic diagram of the gasification extraction process in Embodiment 1 of the present invention, showing the generation of bubbles at the interface (i.e., 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 spacing between two adjacent connection points 2-1 in the queue, the spacing between two adjacent first connection point queues, and the spacing between two adjacent second connection point queues are equal, and their values ​​are denoted as l. The offset between each connection point 2-1 in the first connection point queue and each connection point 2-1 in the second connection point queue is 0.5l.

[0053] In some further embodiments, the horizontally placed cold storage plate 2 is rectangular. The connection points 2-1 form a matrix arrangement at a 45° angle.

[0054] Figure 5 , 6 The cross-sections corresponding to the first and second connection queues are shown respectively. It can be observed that the cross-sections are divided into connection 2-1 and bulge regions, which appear alternately.

[0055] A bulge unit 2-2 is formed by four adjacent connection points 2-1 arranged in a rhombus shape. The most convex point of the bulge unit 2-2 is called the peak point 2-2-1 of the bulge unit 2-2. The four adjacent connection points 2-1 that enclose the bulge unit 2-2 are called the corn valley points of the bulge unit 2-2. The peak point 2-2-1 is located at the center position between the corresponding four corn valley points. The bulge units 2-2 are interconnected to form a complete cold storage cavity 3. The size and bulge height of the bulge unit 2-2 vary with the arrangement density of the connection points 2-1.

[0056] The horizontally placed cold storage plate 2 is divided into two types: a first cold storage plate and a second cold storage plate. Multiple first cold storage plates and multiple second cold storage plates are arranged alternately at equal intervals. The connection points 2-1 on the first and second cold storage plates are staggered, so that the peak points 2-2-1 on the first cold storage plate are aligned with the valley points on the second cold storage plate, and the bulge units 2-2 on the first and second cold storage plates form an interlocking state.

[0057] The bulge units 2-2 on the first and second cold storage plates do not contact each other. The center distance between adjacent first and second cold storage plates is less than the thickness of the peak point 2-2-1 of the horizontally placed cold storage plate 2 (i.e., the distance between the peak points 2-2-1 on both sides of the same bulge unit 2-2), ensuring that there is still a horizontal plane that intersects with the bulge units 2-2 of the adjacent first and second cold storage plates, thus avoiding a completely disengaged state where the first and second cold storage plates are interlocked.

[0058] The adjacent horizontally placed cold storage plates 2 form a working fluid cavity 4. The multiple horizontally placed cold storage plates 2 make the interior of the cold storage tank 1 form multiple cold storage cavities 3 and working fluid cavities 4 that are arranged alternately and are not interconnected.

[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, liquefaction is complete when the liquid working fluid just completely touches the bulge unit 2-2 on the upper surface of the working fluid cavity 4, and the input of gaseous carbon dioxide stops. This saturation condition is set because the upper surface of the working fluid cavity 4 is in direct contact with the gaseous carbon dioxide and performs the main heat exchange function; therefore, when the liquid working fluid contacts the bulge unit on the upper surface of the working fluid cavity 4, the heat exchange efficiency will decrease significantly, and the efficiency of continuing to store carbon dioxide will be low. At this point, the liquid carbon dioxide storage is saturated, and the liquid level of the liquid working fluid is flush with the peak point 2-2-1 of the bulge unit 2-2 on the lower surface of the working fluid cavity 4.

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

[0067] Carbon dioxide gaseous working fluid is drawn from each working fluid chamber 4 through the manifold 5, reducing the pressure within the chamber and lowering the saturation evaporation temperature of the liquid working fluid, which falls below the phase change temperature of the phase change storage material. At this point, the liquid working fluid absorbs heat from the phase change storage material and evaporates, continuously generating gaseous working fluid and storing the cooling capacity in the phase change storage material. The continuously generated gaseous working fluid continues to be output through the working fluid inlet / outlet assembly. Simultaneously, bubbles are generated at the interface between the liquid working fluid and the horizontally placed cooling plate 2 due to the superior heat exchange effect, improving the vaporization efficiency.

[0068] During the liquefaction process, the liquid working fluid is spread evenly on the horizontally placed working fluid chamber 4, which allows for uniform heat exchange with the phase change cold storage material, thus stabilizing the evaporation rate and vapor pressure of carbon dioxide.

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

[0070] Example 2

[0071] An optimization method for an integrated storage and cooling exchange device for cryogenic carbon dioxide gas-liquid conversion is described below:

[0072] Step 1: Establish the target storage volume of liquid carbon dioxide working fluid in working fluid chamber 4 and the storage volume V of cold storage chamber 3. p The constraints between them. The target storage volume of liquid carbon dioxide working fluid represents the volume of liquid carbon dioxide working fluid in working fluid cavity 4 when the liquid surface of the liquid carbon dioxide working fluid contacts the peak point of the bulge unit on the upper surface of the working fluid cavity 4.

[0073] Since the working fluid chamber 4 cannot be filled with liquid carbon dioxide working fluid, the target storage volume V of liquid carbon dioxide working fluid is... g Less than 4V of the working fluid cavity sIn some embodiments, the target storage volume of liquid carbon dioxide working fluid in a single working fluid chamber is the volume of liquid carbon dioxide working fluid when the liquid surface of the working fluid just completely submerges the bulge unit on the lower surface of the working fluid chamber.

[0074] The phase change volume change rate of the phase change material determines the filling rate of the phase change material in cavity 3; therefore, the storage volume V of the cold storage cavity 3 is determined. p The volume of the cold storage chamber 3 is less than or equal to the volume of the storage chamber, specifically, the ratio between the storage volume and the capacity is equal to the fill rate. The cooling capacity required for the liquefaction of gaseous carbon dioxide in one working fluid chamber 4 is provided by half of the cooling capacity of the cold storage chambers 3 on both sides of the working fluid chamber 4; therefore, for a simplified analysis: during the process of completing one round of carbon dioxide liquefaction and storage, the cooling capacity required for the liquefaction of gaseous carbon dioxide in the working fluid chamber 4 is less than or equal to the phase change cooling capacity of one cold storage chamber 3, and preferably the two are equal.

[0075] Therefore, the constraints for establishing the parameters are as follows:

[0076] ρ g ·V g ·λ g ≤ρ p ·V p ·λ p

[0077] Where, 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; 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.

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

[0079] By modifying the above preferred constraints, the volume ratio constraints of carbon dioxide working fluid to phase change cold storage material are obtained as follows:

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

[0081] Step 2: 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 obtained in Step 1, so that the integrated cold storage and heat exchange device for low-temperature carbon dioxide gas-liquid conversion meets the above-mentioned volume ratio constraint. Specifically: the denser the connection points, the smaller the height of the bulge, and the larger the storage volume V of the cold storage cavity 3. p The smaller the volume, the greater the bulge height, and the smaller the storage volume V of the cold storage chamber 3, all while ensuring the strength of the cold storage plate. p The larger it is, the greater its volume ratio V. g / V p The larger the value, the denser the connection points and the smaller the height of the bump unit.

Claims

1. A carbon dioxide oriented low-temperature gas-liquid conversion integrated storage and conversion device, comprising a cold storage tank body (1) and a working fluid inlet and outlet assembly; characterized in that: Further comprising a transverse cold storage sheet (2); a plurality of transverse cold storage sheets (2) are arranged in sequence along the vertical direction in the cold storage tank body (1); two adjacent transverse cold storage sheets (2) form a working medium cavity (4); the working medium inlet and outlet assembly is connected with the working medium cavity (4); The inside of the transverse cold storage sheet (2) forms a cold storage cavity (3) by blowing; a plurality of junction points are arranged in the cold storage cavity (3); the two side walls of the cold storage cavity (3) are connected together at each junction point; each junction point forms a plurality of bulge units (2-2) in the cold storage cavity (3) that are connected to each other; the positions of the bulge units (2-2) on the opposite sides of the two adjacent transverse cold storage sheets (2) are staggered with each other; the cold storage cavity (3) is filled with a phase change cold storage material.

2. The integrated cold storage and conversion device for carbon dioxide oriented low-temperature gas-liquid conversion according to claim 1, characterized in that: The junction points (2-1) in the transverse cold storage sheet (2) are arranged in a diamond queue; four adjacent junction points (2-1) arranged in a diamond form a bulge unit (2-2).

3. The integrated cold storage and conversion device for carbon dioxide oriented gas-liquid conversion at low temperature according to claim 2, characterized in that: The two adjacent transverse cold storage sheets (2) are respectively a first cold storage sheet and a second cold storage sheet; the junction points (2-1) on the first cold storage sheet are aligned with the peak points (2-2-1) of the bulge units (2-2) on the second cold storage sheet.

4. The integrated cold storage and conversion device for carbon dioxide oriented gas-liquid conversion at low temperature according to claim 2, characterized in that: The bulge units (2-2) of the two adjacent transverse cold storage sheets (2) are not in contact, and the center distance of the two adjacent transverse cold storage sheets (2) is less than or equal to the thickness of the transverse cold storage sheet (2) at the peak point (2-2-1).

5. The integrated cold storage and conversion device for carbon dioxide oriented gas-liquid conversion at low temperature according to claim 2, characterized in that: The junction points (2-1) are arranged to form a plurality of first junction point queues and a plurality of second junction point queues arranged alternately at intervals; the distance between adjacent two junction points (2-1) in the queue, the distance between adjacent two first junction point queues, and the distance between adjacent two second junction point queues are equal, and the value is l; the staggered amount between the junction points (2-1) in the first junction point queue and the junction points (2-1) in the second junction point queue is 0.5l.

6. The integrated cold storage and conversion device of claim 1, wherein: A working medium inlet and outlet interface is arranged at the same side edge of each working medium cavity (4); the working medium inlet and outlet assembly comprises a converging pipe (5) and a branch pipe (6); the branch pipe (6) is the same as the number of the working medium cavities (4) and corresponds one by one; the branch pipe (6) is connected between the converging pipe (5) and the corresponding working medium cavity (4).

7. The integrated cold storage and conversion device of claim 1, wherein: The transverse cold storage sheet (2) comprises two side plates; the four peripheral edges of the two side plates are sealingly connected; the two side plates are adhered and fixed at each junction point (2-1); the transverse cold storage sheet (2) is provided with a material filling interface (2-3) for blowing operation and inputting phase change cold storage material; the material filling interface (2-3) is closed after inputting the phase change cold storage material.

8. A method for integrated storage and conversion of carbon dioxide, characterized in that: Use the carbon dioxide low-temperature gas-liquid conversion-oriented storage and exchange cold integrated device of claim 1; The carbon dioxide low-temperature gas-liquid conversion-oriented storage and exchange cold integrated method comprises a storage liquefaction method and a gasification extraction method; The storage liquefaction method comprises: Carbon dioxide gas working medium is input into each working medium cavity (4) through working medium inlet and outlet assembly; the pressure in the working medium cavity (4) increases, the gas working medium absorbs the cold of the phase change cold storage material, and is liquefied on the upper surface of the working medium cavity (4) having a concave-convex structure, and is gathered and dropped under the action of gravity and then laid in the working medium cavity (4) until the liquid carbon dioxide storage is completed; The gasification extraction method comprises: Carbon dioxide gas working medium is sucked from each working medium cavity (4) through the working medium inlet and outlet assembly, so that the pressure in the working medium cavity (4) decreases, 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 absorbs heat and gasifies to continuously produce gaseous working medium output; the cold generated by gasification is absorbed by the phase change cold storage material.

9. The method of claim 8, wherein the method is a carbon dioxide oriented cryogenic gas-liquid conversion integrated storage and replacement method. The condition for saturation of liquid carbon dioxide storage is that the liquid surface of the liquid working medium just touches the bulge unit (2-2) on the upper surface of the working medium cavity (4).

10. A method for optimizing a carbon dioxide oriented low-temperature gas-liquid conversion integrated storage and conversion device, characterized in that: The optimization method for the carbon dioxide low-temperature gas-liquid conversion-oriented storage and replacement cold integrated device as claimed in claim 1 comprises: The volume ratio constraint condition between the target storage volume of the liquid carbon dioxide working medium of the working medium cavity (4) and the storage volume of the phase change cold storage material of the cold storage cavity (3) is as follows: According to the volume ratio constraint condition, the density of the joint points (2-1) on the transversely arranged cold storage sheet (2) and the center distance between the adjacent first and second cold storage sheets are adjusted, so that the carbon dioxide low-temperature gas-liquid conversion-oriented storage and replacement cold integrated device meets the volume ratio constraint condition. V g / V p ≤(ρ p ·λ p ) / (ρ g ·λg) Wherein, V g , V p are the target storage volume of liquid carbon dioxide working medium and the volume of phase change cold storage material respectively; p g , p p are the densities of carbon dioxide working medium and phase change cold storage material respectively; λ g , λ p are the latent heat values of carbon dioxide working medium and phase change cold storage material respectively; ​

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