Buried pipe type evaporator

Abstract

The invention discloses a buried pipe type evaporator, and belongs to the technical field of evaporators, the buried pipe type evaporator comprises a first thermal insulation material, a calandria and a second thermal insulation material, and the calandria is configured to be bent into a preset shape and embedded into the first thermal insulation material and the second thermal insulation material; the first thermal insulation material and the second thermal insulation material are respectively provided with a trend groove matched with the calandria, and an inlet hole and an outlet hole for the calandria to penetrate in and out; the calandria pipes are arranged in a tiled or laminated mode through the moving grooves so as to heat liquid in the calandria pipes through heat of the heat preservation materials, meanwhile, cooling of the heat preservation materials is achieved, the pipelines are embedded into the heat preservation materials of the hot box, water in the pipelines is heated through the heat of the heat preservation materials, cooling of the heat preservation materials and heat absorption of a large amount of water are both considered, and the heat preservation efficiency is improved. The system efficiency is improved, meanwhile, occupied space is reduced, the calandria is embedded into the heat preservation material, heat of the heat preservation material is effectively used for heating liquid in the calandria, cooling of the heat preservation material is achieved, and the utilization efficiency of energy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of evaporators, and more specifically, to a buried-tube evaporator. Background Art

[0002] A solid oxide fuel cell (SOFC) is an all-solid-state chemical power generation device that directly and efficiently converts the chemical energy of fuel into electrical energy in an environmentally friendly manner at a high temperature of 600 - 1000°C. This device has the advantage of reversible operation. When operating in reverse, it is called a solid oxide electrolysis cell (SOEC), which can be used for high-temperature electrolysis of water to produce hydrogen. The SOFC directly converts the chemical energy of fuel into electrical energy through an electrochemical reaction, reducing the intermediate heat conversion link, and thus has higher efficiency than traditional power generation methods. The SOEC is the only one operating under high-temperature conditions in the water electrolysis for hydrogen production technology. It can rely on electrical energy and heat energy to break the hydrogen-oxygen bond, and part of the energy for electrolyzing water can be obtained through heat energy, thereby reducing power consumption.

[0003] In the prior art, the publication number is CN119040523A, which discloses an evaporator including an evaporation chamber. The lower end of the evaporation chamber is connected to a separation chamber. The upper end of the evaporation chamber is provided with a feed pipe orifice, and the lower end of the separation chamber is provided with a discharge pipe orifice. The lower end of the discharge pipe orifice is provided with a discharge assembly. The discharge assembly includes a box body fixedly connected to the lower end of the discharge pipe orifice. The interior of the box body is provided with uniformly distributed discharge grooves; extrusion columns are hermetically and slidably connected inside the discharge grooves. One side of the lower end of the inner wall of each discharge groove is fixedly connected with a discharge pipe. A transition groove is provided on the upper surface of the extrusion column near one side of the discharge pipe, and a communication port is provided at the lower end of the inner wall of the transition groove near the discharge pipe. By setting the discharge assembly, the present invention improves the discharge speed of the evaporator for concentrated syrup and improves the processing speed of the evaporator; by setting a cleaning assembly, the practicability of the discharge assembly is improved; by setting an extension assembly, the use effect of the cleaning assembly is improved, and further the practicability of the discharge assembly is improved.

[0004] Although this device has many beneficial effects, there are still the following problems: Although the evaporator improves the practicability of the discharge assembly, for both the reforming reaction of the SOFC and the electrolysis reaction of the SOEC, it is necessary to heat and convert liquid water (or liquid fuel) into a gas state, and a large amount of heat needs to be absorbed during the evaporation phase change process. The inner wall of the hot box of the SOFC and the SOEC usually operates at a high temperature of 700 - 800°C, and the outer wall temperature is required to be not higher than 60°C. To achieve such a large temperature difference between the inner and outer walls, it is necessary to use thermal insulation materials with a small thermal conductivity and a thickness of 150 mm or even more than 200 mm, which requires a large amount of materials, occupies a large space, and has poor economy. Summary of the Invention

[0005] (1) Technical problem to be solved

[0006] In view of the deficiencies of the prior art, the present invention provides a buried tube evaporator, which solves the above problems.

[0007] (2) Technical solution

[0008] To achieve the above object, the present invention provides the following technical solution: a buried tube evaporator, including a first heat-insulating material, a row of tubes, and a second heat-insulating material.

[0009] The row of tubes is configured to be bendable into a preset shape and embedded inside the first heat-insulating material and the second heat-insulating material.

[0010] Both the first heat-insulating material and the second heat-insulating material are provided with a running groove matching the row of tubes, and an inlet hole and an outlet hole for the row of tubes to penetrate in and out.

[0011] The row of tubes is arranged in a flat or laminated manner through the running groove to heat the liquid in the tube by using the heat of the heat-insulating material, and at the same time, the temperature of the heat-insulating material is reduced.

[0012] Preferably, the row of tubes is an integral seamless metal tube, and the inlet end and the outlet end of the row of tubes respectively extend to the outside of the first heat-insulating material and the second heat-insulating material for inputting liquid water or fuel and outputting gaseous products.

[0013] Preferably, the first heat-insulating material and the second heat-insulating material are divided into upper and lower half structures, the running grooves are distributed on the contact surfaces of the upper and lower halves, and the row of tubes is clamped between the upper and lower halves.

[0014] Preferably, the upper and lower half structures of the first heat-insulating material and the second heat-insulating material are fixed in a detachable manner to adapt to the installation requirements of different rows of tubes.

[0015] Preferably, the bent shape of the row of tubes includes a single-layer flat structure or a multi-layer laminated structure, and the depth of the running groove matches the diameter of the row of tubes to ensure close contact between the row of tubes and the heat-insulating material.

[0016] Preferably, the thickness of the first heat-insulating material 1 and the second heat-insulating material is 150 mm to 200 mm, and its thermal conductivity is less than 0.05 W / (m·K) to meet the temperature difference requirement between the inner and outer walls of the hot box.

[0017] Preferably, the heat-absorbing part of the row of tubes is arranged in a snake shape or a spiral shape along the running groove to increase the heat-absorbing path length of the liquid in the tube.

[0018] Preferably, the positions of the inlet hole and the outlet hole are respectively located on the adjacent sides of the first thermal insulation material and the second thermal insulation material to avoid the reflux interference of the gas-liquid mixture.

[0019] Preferably, the material of the pipe row is high-temperature resistant stainless steel or nickel-based alloy, and its outer surface is coated with an antioxidant coating.

[0020] Preferably, the buried pipe evaporator further includes a fastening device for fixedly connecting the first thermal insulation material and the second thermal insulation material to the pipe row, and the fastening device uses high-temperature resistant ceramic bolts or metal clamps.

[0021] (III) Beneficial effects

[0022] Compared with the prior art, the present invention provides a buried pipe evaporator, which has the following beneficial effects:

[0023] 1. For this buried pipe evaporator, the pipes are buried in the thermal insulation material of the hot box, and the heat of the thermal insulation material is used to heat the water in the pipes. At the same time, it takes into account the cooling of the thermal insulation material and the large amount of heat absorption of the water. While increasing the system efficiency, it also reduces the space occupation and improves the economy. By embedding the pipe row into the thermal insulation material, the heat of the thermal insulation material is effectively utilized to heat the liquid in the pipes, and at the same time, the cooling of the thermal insulation material is realized, improving the energy utilization efficiency. The complex bending shape of the pipe row increases the heat absorption path length of the liquid in the pipes, further enhancing the heat exchange efficiency.

[0024] 2. For this buried pipe evaporator, thermal insulation materials with extremely low thermal conductivity are selected, effectively isolating the heat exchange between the inner and outer walls of the hot box, reducing heat loss. The thermal insulation material is designed as an upper and lower half structure, which is convenient for installation and disassembly, and at the same time ensures the close contact between the pipe row and the thermal insulation material, further improving the heat insulation effect.

[0025] 3. For this buried pipe evaporator, the bending shape and layout of the pipe row can be flexibly adjusted according to actual needs to adapt to different heat requirements and space layouts. The modular design makes the buried pipe evaporator easy to be deployed and maintained on a large scale. The modules are connected by high-temperature resistant ceramic bolts, which is convenient for increasing or decreasing the number of modules according to actual needs.

[0026] 4. For this buried pipe evaporator, the pipe row is selected as a seamless whole metal pipe, and its outer surface is coated with an antioxidant coating, improving the service life and system stability. The fastening device ensures the tight connection between the pipe row and the thermal insulation material, preventing the decrease of heat exchange efficiency caused by loosening.

[0027] 5. For this buried pipe evaporator, the carefully planned positions of the inlet hole and the outlet hole avoid the reflux interference of the gas-liquid mixture inside the evaporator, ensure the smooth flow of the fluid, reduce energy loss, and improve the heat exchange efficiency.

[0028] 6. The buried tube evaporator reduces the amount of heat insulation material used and energy consumption, and lowers the manufacturing cost and operating cost by optimizing the layout and design of the heat insulation material and the drain pipes. Description of the Drawings

[0029] Figure 1 It is an assembled integrated view of a buried tube evaporator.

[0030] Figure 2 It is an exploded view of the assembly of a buried tube evaporator.

[0031] In the figure: 1. The first heat insulation material; 2. The drain pipe; 3. The second heat insulation material. Detailed Embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Please refer to Figure 1 - Figure 2 , the present invention provides a technical solution:

[0034] Embodiment 1:

[0035] A buried tube evaporator includes a first heat insulation material 1, a drain pipe 2, and a second heat insulation material 3.

[0036] The drain pipe 2 is configured to be bent into a preset shape and embedded inside the first heat insulation material 1 and the second heat insulation material 3.

[0037] Both the first heat insulation material 1 and the second heat insulation material 3 are provided with a running groove matching the drain pipe 2, as well as an inlet hole and an outlet hole for the drain pipe 2 to penetrate in and out.

[0038] The drain pipe 2 is arranged flat or in layers through the running groove to heat the liquid in the pipe by using the heat of the heat insulation material, and at the same time, the temperature of the heat insulation material is reduced.

[0039] Furthermore, the drain pipe 2 is a seamless integral metal pipe, and the inlet end and the outlet end of the drain pipe 2 respectively extend to the outside of the first heat insulation material 1 and the second heat insulation material 3 for inputting liquid water or fuel and outputting gaseous products.

[0040] Furthermore, the first heat insulation material 1 and the second heat insulation material 3 are divided into upper and lower half structures, the running grooves are distributed on the contact surfaces of the upper and lower halves, and the drain pipe 2 is clamped between the upper and lower halves.

[0041] Furthermore, the upper and lower half structures of the first thermal insulation material 1 and the second thermal insulation material 3 are fixed in a detachable manner to adapt to the installation requirements of different rows of pipes 2.

[0042] Furthermore, the bending shape of the row of pipes 2 includes a single-layer flat structure or a multi-layer laminated structure, and the depth of the guiding groove matches the diameter of the row of pipes 2 to ensure close contact between the row of pipes 2 and the thermal insulation material.

[0043] The buried tube evaporator of this embodiment adopts a design of the row of pipes 2 with a single-layer flat structure. The row of pipes 2 is selected as a seamless integral high-temperature resistant stainless steel pipe, and its outer surface is coated with an antioxidant coating to improve the service life. The row of pipes 2 is bent into a straight line and laid flat between the first thermal insulation material 1 and the second thermal insulation material 3. Both of these two thermal insulation materials are polyurethane foams with a thickness of 180 mm, and their thermal conductivity is lower than 0.045 W / (m·K), ensuring good thermal insulation performance.

[0044] The first thermal insulation material 1 and the second thermal insulation material 3 are designed as upper and lower half structures, and each has a straight guiding groove inside that matches the diameter of the row of pipes 2 to ensure that the row of pipes 2 is tightly embedded. The two half structures are fixedly connected by high-temperature resistant ceramic bolts, which is convenient for installation and disassembly to adapt to different row of pipes layout requirements. The inlet end and the outlet end of the row of pipes 2 respectively pass through the left side of the first thermal insulation material 1 and the right side of the second thermal insulation material 3, avoiding the backflow interference of the gas-liquid mixture inside the evaporator.

[0045] Embodiment 2:

[0046] In this embodiment, the buried tube evaporator adopts a design of the row of pipes 2 with a multi-layer laminated structure to improve the heat exchange efficiency. The row of pipes 2 is also a seamless integral high-temperature resistant stainless steel pipe, but it is bent into a multi-layer spiral shape to adapt to a compact space layout. Each layer of spiral row of pipes is embedded in the first thermal insulation material 1 and the second thermal insulation material 3 that are divided into upper and lower halves. The thermal insulation material is selected as rock wool with a thickness of 200 mm, and the thermal conductivity is less than 0.05 W / (m·K), providing excellent heat insulation effect.

[0047] The upper and lower half thermal insulation materials are tightly connected by metal clamps, allowing flexible adjustment according to the specific laminated design of the row of pipes 2. The inlet hole of the row of pipes 2 is located at the top of the first thermal insulation material 1, while the outlet hole is located at the bottom of the second thermal insulation material 3. Such a layout further optimizes the fluid flow path and reduces energy loss.

[0048] Furthermore, the thickness of the first thermal insulation material 1 and the second thermal insulation material 3 is 150 mm to 200 mm, and their thermal conductivity is less than 0.05 W / (m·K) to meet the temperature difference requirement between the inner and outer walls of the hot box.

[0049] Furthermore, the heat absorption part of the pipe row 2 is arranged in a serpentine or spiral shape along the guiding groove to increase the heat absorption path length of the liquid in the pipe.

[0050] Furthermore, the positions of the inlet hole and the outlet hole are respectively located on the adjacent sides of the first thermal insulation material 1 and the second thermal insulation material 3 to avoid the backflow interference of the gas-liquid mixture.

[0051] Furthermore, the material of the pipe row 2 is high-temperature resistant stainless steel or nickel-based alloy, and its outer surface is coated with an antioxidant coating.

[0052] Furthermore, the buried pipe evaporator further includes a fastening device for fixedly connecting the first thermal insulation material 1 and the second thermal insulation material 3 to the pipe row 2, and the fastening device uses high-temperature resistant ceramic bolts or metal clamps.

[0053] Embodiment 3:

[0054] The buried pipe evaporator of this embodiment emphasizes modular design, which is convenient for large-scale deployment and maintenance. The pipe row 2 adopts a complex bending shape combining multi-layer flat laying and local spiral shape to adapt to the heat demands of different regions. The material of the pipe row is nickel-based alloy, which has excellent high-temperature resistance and corrosion resistance.

[0055] The first thermal insulation material 1 and the second thermal insulation material 3 adopt modular design. Each module contains a prefabricated pipe row path and the corresponding thermal insulation layer. The thickness of the thermal insulation layer is 160 mm, and aerogel is used as the thermal insulation material, whose thermal conductivity is extremely low, lower than 0.03 W / (m·K). The modules are connected by high-temperature resistant ceramic bolts, which not only ensures the structural stability but also facilitates increasing or decreasing the number of modules according to actual needs.

[0056] The inlet and outlet holes of the pipe row 2 are designed on the side of each module. Through careful layout of the positions, it ensures the smooth flow of the fluid and reduces the backflow phenomenon at the same time. In addition, each module is also equipped with an independent fastening device to ensure the close contact between the pipe row and the thermal insulation material and improve the heat exchange efficiency.

[0057] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only the preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An embedded tube evaporator, comprising a first heat-insulating material (1), a row tube (2) and a second heat-insulating material (3), characterized in that: The row of pipes (2) is configured to be bendable into a preset shape and embedded in the first thermal insulation material (1) and the second thermal insulation material (3); The first thermal insulation material (1) and the second thermal insulation material (3) are both provided with a direction groove matching the row of pipes (2), as well as an inlet hole and an outlet hole for the row of pipes (2) to penetrate in and out; The row of pipes (2) is laid out in a flat or stacked manner through the running grooves, so as to utilize the heat of the thermal insulation material to heat the liquid in the pipes and simultaneously realize cooling of the thermal insulation material.

2. The buried tube evaporator according to claim 1, characterized in that: The row pipe (2) is a seamless whole metal pipe, the inlet end and the outlet end of the row pipe (2) respectively extend to the outside of the first thermal insulation material (1) and the second thermal insulation material (3), and are used to input liquid water or fuel and output gaseous products.

3. The buried tube evaporator according to claim 2, characterized in that: The first thermal insulation material (1) and the second thermal insulation material (3) are divided into an upper and lower half structure, the orientation grooves are distributed on the contact surfaces of the upper and lower halves, and the row pipe (2) is clamped between the upper and lower halves.

4. The buried tube evaporator according to claim 3, characterized in that: The upper and lower halves of the first thermal insulation material (1) and the second thermal insulation material (3) are fixed in a detachable manner to adapt to the installation requirements of different rows of pipes (2).

5. The buried tube evaporator according to claim 4, characterized in that: The bending shape of the row pipe (2) includes a single-layer flat structure or a multi-layer stacked structure, and the depth of the running groove matches the diameter of the row pipe (2) to ensure close contact between the row pipe (2) and the thermal insulation material.

6. The buried tube evaporator according to claim 5, characterized in that: The thickness of the first thermal insulation material (1) and the second thermal insulation material (3) is 150 mm to 200 mm, and the thermal conductivity coefficient thereof is less than 0.05 W / (m·K), so as to meet the temperature difference requirement between the inner and outer walls of the heat box.

7. The buried tube evaporator according to claim 6, characterized in that: The heat absorbing part of the arrangement tube (2) is arranged in a serpentine or spiral shape along the direction groove, so as to increase the heat absorbing path length of the liquid in the tube.

8. The buried tube evaporator according to claim 7, characterized in that: The inlet hole and the outlet hole are located on adjacent sides of the first thermal insulation material (1) and the second thermal insulation material (3) respectively, so as to avoid backflow interference of the gas-liquid mixture.

9. The buried tube evaporator according to claim 8, characterized in that: The material of the row pipe (2) is high temperature resistant stainless steel or nickel-based alloy, and its outer surface is coated with an anti-oxidation coating.

10. The buried tube evaporator according to claim 9, characterized in that: The buried tube evaporator further comprises a fastening device for fixedly connecting the first thermal insulation material (1) and the second thermal insulation material (3) to the row tube (2), and the fastening device adopts a high temperature resistant ceramic bolt or a metal clamp.

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