An insulated flash tank and carbon capture system

Abstract

The application discloses a heat preservation flash tank and a carbon capture system, and relates to the technical field of carbon dioxide capture. The heat preservation flash tank comprises a tank body, a heat storage box and a heat exchange pipe. At least part of the heat storage box is arranged around the periphery of the tank body. The heat storage box comprises a heat storage cavity. A heat storage unit and a heat exchange medium are arranged in the heat storage cavity. The heat storage unit is arranged in the heat storage cavity and is used for heat exchange with the heat exchange medium to store or release heat. The heat exchange pipe is arranged in the tank body and is connected with the heat storage box at both ends. The heat exchange medium is pumped in the heat exchange pipe. The heat exchange medium is used for heat exchange with liquid or gas in the tank body to absorb or release heat. The heat preservation flash tank can preserve the liquid in the flash tank, avoid freezing of the solution in the flash tank when the carbon capture system is shut down, reduce the start-up waiting time of the flash tank, ensure normal operation of the flash tank and the carbon capture system, and reduce the operation energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon dioxide capture, in particular to a heat preservation flash tank and a carbon capture system. BACKGROUND

[0002] In the carbon capture and storage technology, in order to solve the problem of high energy consumption of the regenerated solution in the desorption tower, a process is proposed that the hot lean liquid at the outlet of the bottom of the desorption tower is sent into a low-pressure flash tank, the saturation temperature corresponding to the pressure of the flash tank is lower than the temperature of the lean liquid, the lean liquid is boiled and flashed in the flash tank to produce secondary steam, the secondary steam enters the desorption tower to release heat, thereby reducing the heat load of the reboiler to achieve the purpose of reducing the desorption energy consumption.

[0003] However, in the high-cold region, the environment is bad and the temperature is low. After the carbon capture system of the thermal power plant is shut down, the solution at the bottom of the flash tank will freeze in the low-temperature environment. When it is used again, the flash tank cannot be opened and used, which seriously affects the normal operation of the carbon capture system. If an electric heating method is used to heat the flash tank, a long waiting time is required, and the electric heating will greatly increase the system operation energy consumption and increase the system operation cost. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0005] To this end, the present application provides a heat preservation flash tank, which can preserve the heat of the liquid in the flash tank, avoid freezing of the solution in the flash tank when the carbon capture system is shut down, reduce the start-up waiting time of the flash tank, ensure the normal operation of the flash tank and the carbon capture system, and reduce the operation energy consumption.

[0006] The present application also provides a carbon capture system.

[0007] The heat preservation flash tank of the present application comprises:

[0008] a tank body;

[0009] a heat storage box and a heat exchange pipe, at least part of the heat storage box is arranged around the side of the tank body, the heat storage box comprises a heat storage cavity, the horizontal cross section of the heat storage cavity is annular, the heat storage cavity is provided with a heat storage unit and a heat exchange medium, the heat storage unit is arranged in the heat storage cavity and is used for heat exchange with the heat exchange medium to store or release heat, the heat exchange pipe is arranged in the tank body and has a liquid inlet pipe and a liquid return pipe connected at both ends respectively, the liquid inlet pipe and the liquid return pipe are connected with the heat storage box respectively, the heat exchange pipe, the liquid inlet pipe and the liquid return pipe are pumped with the heat exchange medium, and the heat exchange medium is used for heat exchange with the liquid or gas in the tank body to absorb or release heat.

[0010] The heat preservation flash tank can preserve the liquid in the flash tank, avoid freezing of the solution in the flash tank when the carbon capture system is shut down, reduce the start-up waiting time of the flash tank, ensure normal operation of the flash tank and the carbon capture system, and reduce the operation energy consumption.

[0011] In some embodiments, the heat storage tank is in a cylindrical structure, the heat storage tank is sleeved on the periphery of the tank body and is matched in size with the tank body, and the height of the heat storage tank is not greater than half of the height of the flash tank.

[0012] In the embodiment, the heat storage tank is in a cylindrical structure, which is convenient for assembling with the tank body, and the cylindrical structure can be heat-insulated on the periphery of the tank body, so as to reduce the temperature drop speed of the heat preservation flash tank in the shutdown state, ensure the heat preservation effect on the tank body, and set the height of the heat storage tank to be not greater than half of the height of the flash tank, so as to meet the coverage area requirement of the heat storage tank on the tank body and the space requirement of the heat storage cavity under the condition of the pipeline arrangement connected with the tank body itself, and ensure the flow and heat exchange requirement of the heat exchange medium.

[0013] In some embodiments, the tank body includes a lower end cover in a semispherical shape, the heat storage tank includes a first tank section and a second tank section, the first tank section is in communication with the second tank section and jointly limits the heat storage cavity, the first tank section is sleeved on the periphery of the tank body and is matched in size with the tank body, and the second tank section is matched with the lower end cover and is matched in size with the lower end cover.

[0014] In the embodiment, the heat storage tank is provided as the first tank section and the second tank section, which can realize heat insulation and protection on the bottom and part of the periphery of the tank body, enhance the heat insulation and protection on the lower end cover of the tank body, reduce the heat dissipation efficiency of the tank body, and ensure the heat preservation effect on the tank body and the liquid in the tank body.

[0015] In some embodiments, the heat exchange pipes are provided in plurality, the plurality of heat exchange pipes are in parallel between the liquid inlet pipe and the liquid return pipe, and the heat exchange pipe is provided with heat exchange fins extending in the radial direction, and the heat exchange fins are spaced in plurality along the extension direction of the heat exchange pipe.

[0016] In the embodiment, the plurality of heat exchange pipes can increase the contact area of the heat exchange medium with the liquid or gas in the pipe body to improve the heat exchange efficiency, and the heat exchange fins can increase the heat exchange contact area of the heat exchange pipe to further improve the heat exchange efficiency of the heat exchange medium in the tank body.

[0017] In some embodiments, the heat exchange pipe is in a disc-shaped structure or a ring-shaped structure, and the plurality of heat exchange pipes are spaced in the up-down direction.

[0018] The length of the heat exchange pipe in the tank is increased to increase the flow path and flow time of the heat exchange medium in the tank, increase the contact time of the heat exchange medium with the liquid or gas in the tank, and improve the heat exchange efficiency of the heat exchange medium in the tank.

[0019] In some embodiments, a heat tracing assembly is included, the heat tracing assembly includes a heat tracing pipe, a heat tracing pump and a heat tracing unit, two ends of the heat tracing pipe are connected to the heat storage tank and the heat tracing pipe is in flow communication with the heat exchange medium, the heat tracing pump and the heat tracing unit are arranged in the heat tracing pipe, the heat tracing pump is used for pumping the heat exchange medium along the heat tracing pipe, and the heat tracing unit is used for heat exchange with the heat exchange medium in the heat tracing pipe to heat the heat exchange medium.

[0020] In the present embodiment, the heat tracing assembly is provided, and the heat tracing unit is used as a second heat source to provide heat for the heat exchange medium, so that the heat storage tank cannot be used for heat preservation of the liquid in the tank after the heat is consumed, the effective heat preservation time of the heat storage tank is increased, and the heat preservation of the tank and the liquid in the tank is facilitated.

[0021] In some embodiments, the heat tracing unit includes a heat collector and a heater arranged in sequence on the heat tracing pipe, the heat tracing assembly includes a temperature measuring instrument and a controller, the temperature measuring instrument is arranged in the tank, the temperature measuring instrument is electrically connected with the controller and is used for transmitting a measurement value, and the controller is electrically connected with the heater to drive the heater to work when the measurement value is lower than a set value.

[0022] In the present embodiment, the temperature measuring instrument detects the temperature in the tank, the heat collector and the heater heat the heat exchange medium respectively, the controller drives the heater to heat when the heat collector cannot meet the heat supply demand, i.e., the temperature in the tank drops to a set temperature, the continuous supply of the second heat source is realized, the limitation of the total heat storage amount in the heat storage tank on the heat preservation time of the tank is eliminated, and the heat preservation effect of the tank and the liquid in the tank is ensured.

[0023] In some embodiments, the heat storage unit includes a heat storage pipe and a heat storage medium arranged in the heat storage pipe, the heat storage pipe extends in the up-down direction, and the heat storage unit is arranged in the heat storage cavity and spaced apart along the circumference of the tank.

[0024] In the present embodiment, the multiple heat exchange units are arranged in the heat storage cavity, the heat storage medium is stored in the heat storage pipe by the heat exchange pipe, the contact area between the heat storage medium and the heat storage pipe is increased, the heat storage and heat release efficiency of the heat storage medium is ensured, and the heat preservation of the tank and the liquid in the tank is facilitated.

[0025] In some embodiments, the heat storage tank is provided with a first hole for connecting with the liquid return pipe and a second hole for connecting with the liquid inlet pipe, the first hole is located above the second hole, and the first hole and the second hole have a set distance in the vertical direction.

[0026] Alternatively, the liquid return pipe is connected to the top of the heat storage tank, and one end of the liquid inlet pipe penetrates through the heat storage tank and is located at the bottom of the heat storage cavity.

[0027] In the embodiment, the distance between the position where the liquid return pipe is connected to the tank body and the position where the liquid inlet pipe is connected to the tank body is increased, the flow path of the heat exchange medium in the heat storage tank is increased, the heat exchange of the heat exchange medium in the heat storage tank is facilitated, the temperature of the heat storage medium at each position in the heat storage tank is balanced, and the storage or release of heat by the heat storage unit is facilitated.

[0028] The carbon capture system of the embodiment of the present application comprises a desorption tower and the heat preservation flash tank of any one of the above embodiments, the desorption tower is provided with a liquid discharge pipeline, the heat preservation flash tank is arranged in the liquid discharge pipeline, and the heat preservation flash tank is provided with a steam pipeline connected with the desorption tower.

[0029] The carbon capture system of the embodiment of the present application can avoid freezing of the solution in the flash tank when the carbon capture system is stopped, ensure normal operation of the flash tank and the carbon capture system, shorten the waiting time when the carbon capture system is started, and reduce the operation energy consumption when the carbon capture system is started. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic diagram of the heat preservation flash tank of the embodiment of the present application.

[0031] Figure 2 is a structural schematic diagram of the heat preservation flash tank of another embodiment of the present application.

[0032] Figure 3 is a structural schematic diagram of the heat exchange pipe in the heat preservation flash tank of the embodiment of the present application.

[0033] REFERENCE NUMERALS:

[0034] Tank body 1, heat storage tank 2, heat storage cavity 21, heat storage unit 22, first tank section 23, second tank section 24, heat exchange pipe 3, liquid inlet pipe 4, liquid return pipe 5. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0036] As Figure 1 ,Figure 2 and Figure 3 As shown in the figure, the heat-insulated flash tank of the embodiment of the present application comprises a tank body 1, a heat storage box 2 and a heat exchange pipe 3, at least part of the heat storage box 2 is arranged around the periphery of the tank body 1, the heat storage box 2 comprises a heat storage cavity 21, the horizontal section of the heat storage cavity 21 is annular, the heat storage cavity 21 is provided with a heat storage unit 22 and a heat exchange medium, the heat storage unit 22 is arranged in the heat storage cavity 21 and is used for heat exchange with the heat exchange medium to store or release heat, the heat exchange pipe 3 is arranged in the tank body 1 and has an inlet pipe 4 and a return pipe 5 connected at two ends respectively, the inlet pipe 4 and the return pipe 5 are connected with the heat storage box 2 respectively, the heat exchange pipe 3, the inlet pipe 4 and the return pipe 5 are pumped with the heat exchange medium, and the heat exchange medium is used for heat exchange with the liquid or gas in the tank body 1 to absorb or release heat.

[0037] The heat-insulated flash tank of the embodiment of the present application realizes the heat insulation protection of part of the tank body 1 by arranging the heat storage box 2 in the tank body 1, and meanwhile realizes the heat conduction between the two when the flash tank is heat-insulated, has the heat absorption and storage state and the heat release and insulation state when the heat-insulated flash tank is used, in the heat absorption and storage state, the flash tank and the carbon capture system are in the working state, the heat exchange medium in the heat storage box 2 reaches the heat exchange pipe 3 position in the tank body 1 through the inlet pipe 4, the heat exchange medium is heat-exchanged with the liquid or gas in the tank body 1 through the heat exchange pipe 3 to absorb heat, the heat exchange medium after absorbing heat is returned to the heat storage box 2 through the return pipe 5 and is heat-exchanged with the heat storage unit 22 again to store the heat in the heat storage unit 22; in the heat release and insulation state, the flash tank and the carbon capture system are in the shutdown state, the heat exchange medium in the heat storage box 2 reaches the heat exchange pipe 3 position in the tank body 1 through the inlet pipe 4, the heat exchange medium is heat-exchanged with the liquid in the tank body 1 through the heat exchange pipe 3, the heat exchange medium releases heat to warm the liquid in the tank body 1, the heat exchange medium after releasing heat is returned to the heat storage box 2 through the return pipe 5 and is heat-exchanged with the heat storage unit 22 again to absorb the heat stored in the heat storage unit 22.

[0038] The heat-insulated flash tank of the embodiment of the present application collects the redundant heat when the flash pipe is operated, can heat-insulate the liquid in the tank body 1 by the collected heat when the flash tank stops working, avoids the freezing of the solution in the flash tank when the carbon capture system is shutdown, reduces the start-up waiting time of the flash tank, guarantees the normal operation of the flash tank and the carbon capture system, is energy-saving and efficient, and can reduce the energy consumption of the flash tank in the low-temperature environment.

[0039] It should be noted that at least part of the heat storage box 2 is arranged around the periphery of the tank body 1, which means that part of the heat storage box 2 is arranged around the periphery of the tank body 1, or the whole heat storage box 2 is arranged around the periphery of the tank body 1.

[0040] Optionally, the inlet pipe 4 is provided with a delivery pump, and the top of the heat storage box 2 is provided with a liquid supplementing hole and an exhaust hole.

[0041] Optionally, the heat exchange medium is water or molten salt, wherein the molten salt is a molten body formed after salt is melted, and the principle thereof is known in the art and will not be described herein.

[0042] In some embodiments, as shown in Figure 2 the heat storage tank 2 is a cylindrical structure, the heat storage tank 2 is sleeved on the side of the tank body 1 and is adapted in size to the tank body 1, and the height of the heat storage tank 2 is not greater than half the height of the flash tank.

[0043] Specifically, the support frame is fixedly arranged on the side of the tank body 1 near the bottom, the cylindrical heat storage tank 2 is sleeved on the tank and supported on the support frame, the installation of the heat storage tank 2 is facilitated, the heat storage tank 2 can heat-insulate and protect the side of the tank body 1, the heat loss rate of the heat-insulated flash tank in the shutdown state is reduced, the heat-insulating effect on the tank body 1 is increased, and the height of the heat storage tank 2 is limited, so that the heat-insulating area of the heat storage tank 2 to the tank body 1 and the accommodation space of the heat storage cavity 21 are ensured under the connection requirement of the tank body 1, and the flow and heat exchange requirements of the heat exchange medium are ensured.

[0044] In some embodiments, as shown in Figure 1 the tank body 1 includes a lower end cover in a semispherical shape, the heat storage tank 2 includes a first tank section 23 and a second tank section 24, the first tank section 23 and the second tank section 24 are in communication and jointly limit the heat storage cavity 21, the first tank section 23 is sleeved on the side of the tank body 1 and is adapted in size to the tank body 1, and the second tank section 24 is fitted to the lower end cover and is adapted in size to the lower end cover.

[0045] Specifically, the heat storage tank 2 is divided into the first tank section 23 and the second tank section 24 in the up-down direction, the first tank section 23 is a cylindrical structure with an opening at the bottom, the first tank section 23 is internally provided with a connecting rib plate extending in the radial direction of the first tank section 23, the second tank section 24 is composed of two semispherical tank plates arranged at the same center, a supporting rib plate extending in the radial direction of the semispherical tank plate is arranged between the two tank plates, and the end portions of the two semispherical tank plates limit a second opening, the second opening and the first opening are adapted in size to enable the first tank section 23 and the second tank section 24 to be in communication and jointly limit the heat storage cavity 21.

[0046] The first tank section 23 and the second tank section 24 can heat-insulate and protect the bottom and part of the side of the tank body 1, improve the heat-insulating effect on the tank body 1, reduce the heat loss efficiency of the liquid in the tank body 1 in the shutdown state of the flash tank, and strengthen the heat-insulating effect on the tank body 1 and the liquid in the tank body 1.

[0047] Optionally, the second tank section 24 is provided with a perforation in the up-down direction, and the perforation is used for the connecting pipeline at the bottom of the tank body 1 to pass through.

[0048] In some embodiments, as shown in Figure 1 and Figure 2As shown, the heat exchange pipes 3 are provided in plurality, the plurality of heat exchange pipes 3 are provided in parallel between the liquid inlet pipe 4 and the liquid return pipe 5, and the heat exchange pipes 3 are provided with heat exchange fins extending in the radial direction, and the heat exchange fins are provided in plurality at intervals along the extension direction of the heat exchange pipes 3.

[0049] The plurality of heat exchange pipes 3 are provided to increase the contact area of the heat exchange medium with the liquid or gas in the pipe body, and to improve the heat exchange efficiency of the heat exchange medium in the tank body 1, and the heat exchange fins are provided to increase the heat exchange contact area of the heat exchange pipes 3 with the liquid or gas in the tank body 1, and to further improve the heat exchange efficiency of the heat exchange medium in the tank body 1.

[0050] In some embodiments, as shown, Figure 3 The heat exchange pipes 3 are provided in a disc-shaped structure or a ring-shaped structure, and the plurality of heat exchange pipes 3 are provided at intervals in the up-down direction, and the heat exchange pipes 3 are provided in a disc-shaped structure or a ring-shaped structure, which can increase the flow path and flow time of the heat exchange medium in the tank body 1, increase the contact time of the heat exchange medium with the liquid or gas in the tank body 1, and improve the heat exchange efficiency of the heat exchange medium in the tank body 1.

[0051] In some embodiments, a heat tracing assembly is provided, the heat tracing assembly includes a heat tracing pipe, a heat tracing pump and a heat tracing unit, both ends of the heat tracing pipe are connected to the heat storage tank 2, and the heat tracing pipe is provided with the heat exchange medium flowing therethrough, the heat tracing pump and the heat tracing unit are provided in the heat tracing pipe, the heat tracing pump is used to pump the heat exchange medium along the heat tracing pipe, and the heat tracing unit is used to exchange heat with the heat exchange medium in the heat tracing pipe to heat the heat exchange medium.

[0052] By providing the heat tracing assembly, the heat tracing pump and the heat tracing pipe are used to circulate and deliver the heat exchange medium in the heat storage tank 2, the heat exchange medium flows through the heat tracing unit through the heat tracing pipe, and the heat exchange medium is heated by exchanging heat with the heat tracing unit at the position of the heat tracing unit, which ensures the heat source supply of the heat exchange medium, avoids the heat consumption of the heat storage tank 2, increases the effective heat preservation time of the heat storage tank 2, and facilitates the heat preservation of the tank body 1 and the liquid in the tank body 1.

[0053] In some embodiments, the heat tracing unit includes a flat-plate solar heat collector and an electric heater provided in sequence on the heat tracing pipe, the flat-plate solar heat collector heats the heat exchange medium by solar energy, which is energy-saving, environmentally friendly and can reduce energy consumption, and when the flat-plate solar heat collector cannot meet the heat supply demand, the electric heater can be used to heat the heat exchange medium.

[0054] The heat tracing assembly comprises a temperature measuring instrument and a controller, the temperature measuring instrument is arranged in the tank body 1, the temperature measuring instrument is electrically connected with the controller, the temperature of the tank body 1 is detected by the temperature measuring instrument, and the measured value is transmitted to the controller, the controller is electrically connected with the electric heater, and the electric heater, the controller and the temperature measuring instrument are connected with the power grid, when the heat storage tank 2 and the flat-plate solar heat collector cannot meet the heat supply demand of the heat exchange medium, the temperature of the liquid in the tank body 1 begins to drop, when the measured value received by the controller is lower than the set value, the controller drives the electric heater to work to heat the heat exchange medium, the limitation of the limited total heat storage amount in the heat storage tank 2 on the heat preservation time of the tank body 1 is eliminated, and the heat preservation effect of the tank body 1 and the liquid in the tank body 1 is guaranteed.

[0055] In some embodiments, as shown in Figure 1 and Figure 2 , the heat storage unit 22 comprises a heat storage pipe and a heat storage medium arranged in the heat storage pipe, the heat storage medium is molten salt, the heat storage unit 22 extends along the up-down direction, the heat storage unit 22 is arranged in multiple and is arranged in the heat storage cavity 21 in the circumferential direction of the tank body 1, the separated storage of the heat storage medium can be realized, the contact area of the heat exchange medium and the heat storage pipe is increased, the heat storage and heat release efficiency of the heat storage medium is guaranteed, and the heat preservation of the tank body 1 and the liquid in the tank body 1 is facilitated.

[0056] In some embodiments, the heat storage tank 2 is provided with a first hole for connecting with the liquid return pipe 5 and a second hole for connecting with the liquid inlet pipe 4, the first hole is located above the second hole, and the first hole and the second hole have a set distance in the up-down direction, the connection position relationship of the liquid inlet pipe 4 and the liquid return pipe 5 with the heat storage tank 2 realizes the adjustment of the flow path of the heat exchange medium in the heat storage tank 2, the flow area of the heat exchange medium in the heat storage tank 2 is increased, the heat exchange efficiency of the heat exchange medium is improved, the temperature of the heat storage medium in each region of the heat storage tank 2 is balanced, and then the heat storage or heat release of the heat storage unit 22 is facilitated.

[0057] In some embodiments, as shown in Figure 1 and Figure 2 , the liquid return pipe 5 is connected to the top of the heat storage tank 2, one end of the liquid inlet pipe 4 penetrates through the heat storage tank 2 and is located at the bottom of the heat storage cavity 21, the one end of the liquid inlet pipe 4 is inserted into the heat storage tank 2 to adjust the flow path of the heat exchange medium, which is convenient for processing and is not limited by the connection position of the liquid inlet pipe 4 and the heat storage tank 2, the heat exchange efficiency of the heat exchange medium in the heat storage tank 2 is improved, the temperature of the heat storage medium in each region of the heat storage tank 2 is balanced, and then the heat storage or heat release of the heat storage unit 22 is facilitated.

[0058] The carbon capture system of the embodiment of the present application is described below.

[0059] The carbon capture system of the embodiment of the present application comprises a desorption tower and the heat-insulated flash tank of any one of the above embodiments, the desorption tower is provided with a liquid discharge pipeline, and the heat-insulated flash tank is arranged in the liquid discharge pipeline and is provided with a steam pipeline connected with the desorption tower.

[0060] The carbon capture system of the embodiment of the present application can avoid freezing of the solution in the flash tank when the carbon capture system is stopped, ensure normal operation of the flash tank and the carbon capture system, shorten the waiting time when the carbon capture system is started, and reduce the operation energy consumption when the carbon capture system is started.

[0061] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0062] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0063] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected or can communicate with each other; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0064] In the present application, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature is "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature is "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0065] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0066] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A heat-insulating flash evaporator, characterized in that, include: Tank body; A heat storage box and heat exchange tubes are provided. At least part of the heat storage box is arranged around the periphery of the tank body. The heat storage box includes a heat storage cavity with an annular horizontal cross-section. The heat storage cavity is provided with a heat storage unit and a heat exchange medium. The heat storage unit is located in the heat storage cavity and is used to exchange heat with the heat exchange medium to store or release heat. The heat exchange tubes are located in the tank body and are respectively connected to an inlet pipe and a return pipe at both ends. The inlet pipe and the return pipe are respectively connected to the heat storage box. The heat exchange medium is pumped into the heat exchange tubes, the inlet pipe, and the return pipe. The heat exchange medium is used to exchange heat with the liquid or gas in the tank body to absorb or release heat. A heat tracing assembly includes a heat tracing pipe, a heat tracing pump, and a heat tracing unit. The two ends of the heat tracing pipe are connected to the heat storage tank, and the heat exchange medium flows through the heat tracing pipe. The heat tracing pump and the heat tracing unit are disposed on the heat tracing pipe. The heat tracing pump is used to pump the heat exchange medium along the heat tracing pipe, and the heat tracing unit is used to exchange heat with the heat exchange medium in the heat tracing pipe to raise the temperature of the heat exchange medium.

2. The insulated flash evaporator according to claim 1, characterized in that, The heat storage box has a cylindrical structure. The heat storage box is fitted around the tank body and is adapted to the size of the tank body. The height of the heat storage box is not greater than half the height of the flash tank.

3. The insulated flash evaporator according to claim 1, characterized in that, The tank shown includes a hemispherical lower end cover. The heat storage box includes a first box section and a second box section. The first box section and the second box section are connected and together define the heat storage cavity. The first box section is fitted around the tank and is adapted to the size of the tank. The second box section is fitted to the lower end cover and is adapted to the size of the lower end cover.

4. The insulated flash evaporator according to claim 1, characterized in that, The heat exchange tubes are provided in multiples, and the multiple heat exchange tubes are connected in parallel between the liquid inlet pipe and the liquid return pipe. The heat exchange tubes are provided with heat exchange fins extending radially, and the heat exchange fins are provided at intervals along the extension direction of the heat exchange tubes.

5. The insulated flash evaporator according to claim 4, characterized in that, The heat exchange tubes are in the form of a disc or annular structure, and multiple heat exchange tubes are spaced apart in the vertical direction.

6. The insulated flash evaporator according to claim 1, characterized in that, The heat tracing unit includes a heat collector and a heater arranged sequentially on a heat tracing pipe. The heat tracing assembly includes a temperature measuring instrument and a controller. The temperature measuring instrument is located inside the tank. The temperature measuring instrument is electrically connected to the controller and is used to transmit the measured value. The controller is electrically connected to the heater to drive the heater to operate when the measured value is lower than a set value.

7. The insulated flash evaporator according to claim 1, characterized in that, The heat storage unit includes a heat storage pipe and a heat storage medium disposed inside the heat storage pipe. The heat storage pipe extends in the vertical direction, and multiple heat storage units are provided and are spaced apart along the circumference of the tank body within the heat storage cavity.

8. The insulated flash evaporator according to claim 7, characterized in that, The heat storage tank is provided with a first hole for connecting to the return pipe and a second hole for connecting to the inlet pipe. The first hole is located above the second hole, and the first hole and the second hole are at a set distance in the vertical direction. Alternatively, the return pipe is connected to the top of the heat storage tank, and one end of the inlet pipe passes through the heat storage tank and is located at the bottom of the heat storage cavity.

9. A carbon capture system, characterized in that, The device includes a desorption tower and a heat-insulating flash tank as described in any one of claims 1-8, wherein the desorption tower is provided with a drain pipe, the heat-insulating flash tank is located on the drain pipe, and the heat-insulating flash tank is provided with a steam pipe connected to the desorption tower.

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