Low-boiling liquefied gas cold energy recovery freeze protection vaporizer

Abstract

The utility model discloses a low boiling point liquefied gas cold energy recovery freeze protection vaporizer belongs to vaporizer technical field, include: casing, upper parallel flow pipe plate and lower parallel flow pipe plate, upper parallel flow pipe plate with lower parallel flow pipe plate opposite setting in casing, micro heat pipe array, micro heat pipe array's condensation end sets up on upper parallel flow pipe plate, and the evaporation section sets up on lower parallel flow pipe plate, wherein, upper parallel flow pipe plate passes into low boiling point liquefied gas, lower parallel flow pipe plate passes into the cold carrier, and the freezing point of cold carrier is lower than -20 DEG C, a working medium that is encapsulated in micro heat pipe array, when the temperature is lower than -20 DEG C -0 DEG C, heat pipe is in dormancy or freezing state, and stop running. The utility model solves the difficult problem that the traditional use of partition wall type heat exchanger shutdown freezes even destroys the vaporizer, and also very good recovery low boiling point liquefied gas gasification energy produced when.

Description

Technical Field

[0001] This utility model belongs to the field of vaporizer technology, specifically, it relates to a low-boiling-point liquefied gas cold energy recovery antifreeze vaporizer. Background Technology

[0002] Low-boiling-point liquefied gases such as LNG, liquid nitrogen, and olefins need to be vaporized before use. The heat energy used in the vaporization process is generally natural energy sources such as air or seawater, as well as electric auxiliary heating. Some chemical industries even use steam or waste heat from industrial circulating water for vaporization, which not only wastes a lot of cold energy, but also consumes valuable electrical energy or steam. Utility Model Content

[0003] To solve the above problems, the present invention adopts the following technical solution: A low-boiling-point liquefied gas cold energy recovery and antifreeze vaporizer includes: case; An upper parallel flow tube sheet and a lower parallel flow tube sheet are disposed opposite to each other within the housing; each end of the upper parallel flow tube sheet and the lower parallel flow tube sheet is provided with a pipe inlet and a pipe outlet; the pipe inlet of the upper parallel flow tube sheet and the pipe outlet of the lower parallel flow tube sheet are located at the same end, and the pipe outlet of the upper parallel flow tube sheet and the pipe inlet of the lower parallel flow tube sheet are located at the same end. A micro heat pipe array, wherein the condensation end of the micro heat pipe array is disposed on the upper parallel flow tube plate, and the evaporation section is disposed on the lower parallel flow tube plate; The upper parallel flow tube sheet is circulated with low-boiling-point liquefied gas, and the lower parallel flow tube sheet is circulated with a refrigerant whose freezing point is below -20°C; both ends of the lower parallel flow tube sheet pass through the shell and are connected to a cold energy user. A working fluid encapsulated within a micro heat pipe array, wherein the heat pipes are in a dormant or frozen state and cease operation when the temperature is below -20°C to 0°C.

[0004] Furthermore, the micro heat pipe array is provided in two sets, with the condensation ends of the two sets of micro heat pipe arrays respectively located on both sides of the upper parallel flow tube plate, and the evaporation sections of the two sets of micro heat pipe arrays respectively located on both sides of the lower parallel flow tube plate, and the two sets of micro heat pipe arrays are arranged opposite to each other.

[0005] Furthermore, the distance between the upper parallel flow tube plate and the lower parallel flow tube plate is greater than 20cm.

[0006] Furthermore, the outlet of the upper parallel flow tube sheet is equipped with a temperature sensor for measuring the gas temperature.

[0007] Furthermore, a thermally conductive pad is provided between the lower parallel flow tube plate and the micro heat pipe array.

[0008] Furthermore, the upper parallel flow tube sheet / lower parallel flow tube sheet is an extruded flat tube sheet, and the two ends of the upper parallel flow tube sheet / lower parallel flow tube sheet are connected to a flow channel.

[0009] Furthermore, the upper parallel flow tube sheet / lower parallel flow tube sheet is extruded into an aluminum alloy flat tube sheet, and a copper / steel tube is disposed inside the upper parallel flow tube sheet / lower parallel flow tube sheet.

[0010] Furthermore, the upper parallel flow tube sheet / lower parallel flow tube sheet is an extruded shaped tube sheet or a combined tube sheet.

[0011] The beneficial effects of this utility model are: This invention effectively utilizes the forward (bottom-to-top) high-efficiency heat conduction characteristics of a micro heat pipe array. When the refrigerant in the lower parallel flow tube plate is in operation, it ensures the vaporization of low-boiling-point liquefied gas in the upper parallel flow tube plate. When the refrigerant is shut down, the temperature of the micro heat pipe array drops rapidly. When its temperature falls below -20℃ to 0℃, the heat pipes enter a dormant or frozen state and stop operating, thus preventing the refrigerant from freezing or even damaging the vaporizer. This solves the problem of freezing or even damage to the vaporizer when using traditional indirect heat exchangers during shutdown, while also effectively recovering the energy generated during the vaporization of low-boiling-point liquefied gas. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a low-boiling-point liquefied gas cold energy recovery and antifreeze vaporizer according to the present invention; Figure 2 This is a schematic diagram of the structure of a low-boiling-point liquefied gas cold energy recovery antifreeze vaporizer according to the present invention; Figure 3 This is a front view of the upper parallel flow tube plate / lower parallel flow tube plate of Embodiment 2 of this utility model; Figure 4 This is a side view of the upper parallel flow tube plate / lower parallel flow tube plate of Embodiment 2 of this utility model; Figure 5 This is a front view of the upper parallel flow tube plate / lower parallel flow tube plate of Embodiment 3 of this utility model; Figure 6 This is a side view of the upper parallel flow tube plate / lower parallel flow tube plate of Embodiment 3 of this utility model; Figure 7 This is a front view of the upper parallel flow tube plate / lower parallel flow tube plate of Embodiment 4 of this utility model; Figure 8 This is a side view of the upper parallel flow tube plate / lower parallel flow tube plate of Embodiment 4 of this utility model; In the diagram: 1. Shell; 2. Cooling user; 3. Upper parallel flow tube sheet; 4. Lower parallel flow tube sheet; 5. Micro heat pipe array. Detailed Implementation

[0013] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0014] Example 1

[0015] refer to Figures 1-2 A low-boiling-point liquefied gas cold energy recovery and antifreeze vaporizer, comprising: Casing 1; Upper parallel flow tube sheet 3 and lower parallel flow tube sheet 4 are arranged opposite to each other inside the shell 1; both ends of the upper parallel flow tube sheet 3 and the lower parallel flow tube sheet 4 are provided with pipe inlet and pipe outlet; the pipe inlet of the upper parallel flow tube sheet 3 and the pipe outlet of the lower parallel flow tube sheet 4 are located at the same end, and the pipe outlet of the upper parallel flow tube sheet 3 and the pipe inlet of the lower parallel flow tube sheet 4 are located at the same end. The micro heat pipe array 5 has its condensation end set on the upper parallel flow tube plate 3 and its evaporation section set on the lower parallel flow tube plate 4. The upper parallel flow tube plate 3 is used to introduce low-boiling-point liquefied gas, and the lower parallel flow tube plate 4 is used to introduce a refrigerant with a freezing point below -20°C. Both ends of the lower parallel flow tube plate are connected to a cold energy user 2 through the shell. A working fluid encapsulated within a micro heat pipe array, wherein the heat pipes are in a dormant or frozen state and cease operation when the temperature is below -20°C to 0°C.

[0016] In this embodiment, the cold energy user 2 is an ice maker.

[0017] In other embodiments, the cold energy user 2 is a fan coil unit for cooling cold storage or buildings.

[0018] Preferably, the micro heat pipe array 5 is provided in two sets. The condensing ends of the two sets of micro heat pipe array 5 are respectively arranged on both sides of the upper parallel flow tube plate 3, and the evaporation sections of the two sets of micro heat pipe array 5 are respectively arranged on both sides of the lower parallel flow tube plate 4, and the two sets of micro heat pipe array 5 are arranged opposite to each other.

[0019] Preferably, the distance between the upper parallel flow tube plate 3 and the lower parallel flow tube plate 4 is greater than 20cm.

[0020] In this embodiment, the present invention ensures that when the refrigerant stops running, the cooling capacity of the low-boiling-point liquefied gas is sufficient to transfer heat to the refrigerant through the metal material of the micro heat pipe array 5, causing the refrigerant to solidify. By adjusting the flow rate of the refrigerant, the freezing point of the refrigerant is kept at least 2°C lower than the user's temperature. By adjusting the length of the micro heat pipe array, i.e., adjusting the distance between the upper and lower parallel flow tube plates, the thermal resistance of the micro heat pipe array from top to bottom is adjusted, ensuring that the refrigerant does not solidify.

[0021] Preferably, a thermally conductive pad is also provided between the lower parallel flow tube plate 4 and the micro heat pipe array 5.

[0022] In this embodiment, the present invention adjusts the thermal resistance between the lower parallel flow tube plate 4 and the micro heat pipe array 5 by adjusting the pressure applied between the lower parallel flow tube plate 4 and the micro heat pipe array 5, thereby ensuring that the refrigerant does not solidify.

[0023] Preferably, the outlet of the upper parallel flow tube sheet 3 is equipped with a temperature sensor for measuring the gas temperature. When the gas temperature is lower than or equal to its saturation temperature, the load at the user end is increased or the flow rate of the liquefied gas into the vaporizer is reduced. By ensuring the superheat of the liquefied gas after vaporization, the complete vaporization of the liquefied gas is guaranteed.

[0024] Example 2

[0025] refer to Figures 3-4 This embodiment is a further setting based on implementation 1.

[0026] Preferably, the upper parallel flow tube plate 3 and the lower parallel flow tube plate 4 are extruded flat tube plates, and the two ends of the upper parallel flow tube plate 3 and the lower parallel flow tube plate 4 are connected to a flow channel.

[0027] Example 3

[0028] refer to Figures 5-6 This embodiment is a further setting based on implementation 1.

[0029] Preferably, the upper parallel flow tube sheet / lower parallel flow tube sheet is an aluminum alloy flat tube sheet formed by extrusion, and copper / steel tubes are installed inside the upper parallel flow tube sheet / lower parallel flow tube sheet.

[0030] Example 4

[0031] refer to Figures 7-8 This embodiment is a further setting based on implementation 1.

[0032] Preferably, the upper parallel flow tube sheet / lower parallel flow tube sheet is an extruded shaped tube sheet or a combined tube sheet.

[0033] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model are included within the protection scope of this utility model.

Claims

1. A low-boiling-point liquefied gas cold energy recovery and antifreeze vaporizer, characterized in that, include: case; An upper parallel flow tube sheet and a lower parallel flow tube sheet are disposed opposite to each other within the housing; each end of the upper parallel flow tube sheet and the lower parallel flow tube sheet is provided with a pipe inlet and a pipe outlet; the pipe inlet of the upper parallel flow tube sheet and the pipe outlet of the lower parallel flow tube sheet are located at the same end, and the pipe outlet of the upper parallel flow tube sheet and the pipe inlet of the lower parallel flow tube sheet are located at the same end. A micro heat pipe array, wherein the condensation end of the micro heat pipe array is disposed on the upper parallel flow tube plate, and the evaporation section is disposed on the lower parallel flow tube plate; The upper parallel flow tube sheet is circulated with low-boiling-point liquefied gas, and the lower parallel flow tube sheet is circulated with a refrigerant whose freezing point is below -20°C; both ends of the lower parallel flow tube sheet pass through the shell and are connected to a cold energy user. A working fluid encapsulated within a micro heat pipe array, wherein the heat pipes are in a dormant or frozen state and cease operation when the temperature is below -20°C to 0°C.

2. The low-boiling-point liquefied gas cold energy recovery antifreeze vaporizer according to claim 1, characterized in that, The micro heat pipe array is provided in two sets. The condensation ends of the two sets of micro heat pipe arrays are respectively located on both sides of the upper parallel flow tube plate, and the evaporation sections of the two sets of micro heat pipe arrays are respectively located on both sides of the lower parallel flow tube plate. The two sets of micro heat pipe arrays are arranged opposite to each other.

3. The low-boiling-point liquefied gas cold energy recovery antifreeze vaporizer according to claim 2, characterized in that, The distance between the upper parallel flow tube sheet and the lower parallel flow tube sheet is greater than 20cm.

4. A low-boiling-point liquefied gas cold energy recovery antifreeze vaporizer according to claim 3, characterized in that, The outlet of the upper parallel flow tube sheet is equipped with a temperature sensor for measuring the gas temperature.

5. A low-boiling-point liquefied gas cold energy recovery antifreeze vaporizer according to claim 1, characterized in that, A thermally conductive pad is also provided between the lower parallel flow tube plate and the micro heat pipe array.

6. A low-boiling-point liquefied gas cold energy recovery antifreeze vaporizer according to claim 1, characterized in that, The upper parallel flow tube sheet / lower parallel flow tube sheet is an extruded flat tube sheet, and the two ends of the upper parallel flow tube sheet / lower parallel flow tube sheet are connected to a flow channel.

7. A low-boiling-point liquefied gas cold energy recovery antifreeze vaporizer according to claim 1, characterized in that, The upper parallel flow tube sheet / lower parallel flow tube sheet is an aluminum alloy flat tube sheet formed by extrusion, and copper / steel tubes are provided inside the upper parallel flow tube sheet / lower parallel flow tube sheet.

8. A low-boiling-point liquefied gas cold energy recovery antifreeze vaporizer according to claim 1, characterized in that, The upper parallel flow tube sheet / lower parallel flow tube sheet is an extruded shaped tube sheet or a combined tube sheet.

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