Triple-isolation-structure-coupled heat-pipe type low-temperature economizer

Abstract

The application discloses a heat pipe type low-temperature economizer with triple isolation structure coupling, which comprises a plurality of heat pipes, a plurality of water condensation sleeve pipes, sealing partitions and elastic sealing layers, heat pipes are arranged on the sealing partitions and fixedly connected, the outer part of the condensing section of the heat pipes is sleeved with the water condensation sleeve pipes, annular closed cooling water channels are formed between the water condensation sleeve pipes and the outer walls of the heat pipes, two adjacent cooling water channels are communicated through communicating pipes, the lower side of the sealing partition is provided with the elastic sealing layer which is sleeved on the heat pipe, and the water condensation sleeve pipe, the sealing partition and the elastic sealing layer jointly form a triple isolation sealing structure. Compared with the prior art, the overall operation reliability and service life of the low-temperature economizer can be greatly improved.

Description

Technical Field

[0001] This invention relates to the technical field of heat pipe type low-temperature economizers, and in particular to the technical field of a heat pipe type low-temperature economizer with a triple-isolation structure coupling. Background Technology

[0002] Currently, in the field of waste heat recovery from flue gas in coal-fired power plants, heat pipe-type low-temperature economizers are a widely used technical solution. Their core working principle lies in utilizing the high-efficiency heat transfer characteristics of heat pipes: the evaporation section of the heat pipe is placed in the flue gas channel, absorbing heat from the high-temperature flue gas and causing the working fluid inside the pipe to evaporate; the steam flows to the condensation section under pressure difference, condenses in the condensation section, and releases latent heat of vaporization, thereby heating the cooling water outside the pipe. In traditional structural designs, the condensation section of the heat pipe usually extends directly into a water chamber or water jacket to exchange heat with the cooling water. The flue gas side shell and the water side shell are usually mechanically separated and sealed by a fixed metal partition. The heat pipe passes through this partition. This solution mainly relies on the high-efficiency isothermal conductivity of the heat pipe itself and the corrosion resistance of its pipe wall material. Its structural form is relatively straightforward, aiming to achieve the transfer of heat from the flue gas to the cooling water.

[0003] The aforementioned technical defects are as follows: the isolation between the flue gas side and the water side is achieved by using a single rigid sealing baffle, and the metal wall of the condensing section of the heat pipe is in direct contact with the cooling water without an additional protective layer. This structure is difficult to adapt to thermal stress deformation and vibration, and is prone to leakage due to fatigue at the baffle seal. Once it fails, the cooling water will directly enter the flue, causing blockage or even unit shutdown. The lack of multiple physical isolation and flexible buffer design results in insufficient sealing reliability and durability. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art and propose a heat pipe type low-temperature economizer with triple isolation structure coupling, which can significantly improve the overall operational reliability and service life of the low-temperature economizer.

[0005] To achieve the above objectives, this invention proposes a triple-isolation structure coupled heat pipe type low-temperature economizer, comprising several heat pipes, several condensing sleeves, a sealing partition, and an elastic sealing layer. The sealing partition is fitted with a fixedly sealed heat pipe. The condensing section of each heat pipe is fitted with a condensing sleeve, forming an annular sealed cooling water channel between the condensing sleeve and the outer wall of the heat pipe. Two adjacent cooling water channels are connected by a connecting pipe. An elastic sealing layer is fitted onto the heat pipe on the lower side of the sealing partition. The condensing sleeve, sealing partition, and elastic sealing layer together constitute a triple-isolation sealing structure.

[0006] Preferably, it also includes a clamping plate that presses against the underside of the elastic sealing layer and is fitted onto the heat pipe.

[0007] Preferably, both ends of the hydrocondensation sleeve are fixedly and sealed to the heat pipe by welding or mechanical means.

[0008] Preferably, each heat pipe is provided with a connecting sleeve.

[0009] Preferably, the portion of the connecting sleeve that passes through the sealing partition is statically sealed to the sealing partition by welding or mechanical means.

[0010] Preferably, the diameter of the through hole in the elastic sealing layer through which the connecting sleeve passes is smaller than the outer diameter of the connecting sleeve.

[0011] Preferably, the heat pipe has spiral fins on the outside of the condensation section, and the surface of the spiral fins has several turbulence holes or pits, and the spiral helix angle of the spiral fins is 30 to 45 degrees.

[0012] Preferably, the connecting pipes are arranged alternately at the top and bottom, and the cooling water channels are connected sequentially through the connecting pipes to form a cooling water baffle channel.

[0013] The beneficial effects of this invention are as follows: 1. By adopting a triple isolation structure of condensate jacket + sealing partition + elastic sealing layer coupling, multiple physical isolations are achieved between flue gas and cooling water. This design fundamentally prevents cooling water leakage into the flue gas, which could cause blockages or even unit shutdown, thereby significantly improving the overall operational reliability and service life of the low-temperature economizer; 2. The structure of this invention can maintain efficient and stable heat exchange performance for a long time. The cooling water in the condensate jacket directly and fully contacts the condensing section of the heat pipe for heat exchange, resulting in a short and efficient heat transfer path; 3. Compared with existing technical solutions, the requirements for the base pipe material can be reduced, lowering the cost of the equipment itself. At the same time, the wall thickness of the heat exchange tube can be appropriately reduced, saving equipment weight and civil engineering load, and reducing unit investment costs.

[0014] The features and advantages of the present invention will be described in detail through embodiments and in conjunction with the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a heat pipe type low-temperature economizer with triple isolation structure coupling according to the present invention.

[0016] In the diagram: 1-Heat pipe, 2-Condensation sleeve, 3-Cooling water channel, 4-Sealing partition, 5-Elastic sealing layer, 6-Connecting pipe, 7-Pressure plate, 8-Through hole, 9-Connecting sleeve. Detailed Implementation

[0017] See Figure 1This invention discloses a triple-isolation structure coupled heat pipe type low-temperature economizer, comprising several heat pipes 1, several condensing sleeves 2, a sealing partition 4, and an elastic sealing layer 5. The sealing partition 4 is fitted with a fixedly sealed heat pipe 1. The condensing section of each heat pipe 1 is fitted with a condensing sleeve 2. An annular sealed cooling water channel 3 is formed between the condensing sleeve 2 and the outer wall of the heat pipe 1. Two adjacent cooling water channels 3 are connected by a connecting pipe 6. An elastic sealing layer 5 is fitted on the heat pipe 1 on the lower side of the sealing partition 4. The condensing sleeves 2, the sealing partition 4, and the elastic sealing layer 5 together constitute a triple-isolation sealing structure.

[0018] It also includes a pressure plate 7 that is pressed against the underside of the elastic sealing layer 5 and fitted onto the heat pipe 1.

[0019] The two ends of the hydrocondensing sleeve 2 are fixedly and sealed to the heat pipe 1 by welding or mechanical means.

[0020] Each heat pipe 1 is equipped with a connecting sleeve 9.

[0021] The portion of the connecting sleeve 9 that passes through the sealing partition 3 is statically sealed to the sealing partition 3 by welding or mechanical means.

[0022] The diameter of the through hole 8 on the elastic sealing layer 5 through which the connecting sleeve 9 passes is smaller than the outer diameter of the connecting sleeve 9.

[0023] The heat pipe 1 has a spiral fin on the outside of the condensation section. The surface of the spiral fin has several turbulence holes or pits. The spiral helix angle of the spiral fin is 30 to 45 degrees.

[0024] The connecting pipes 6 are arranged alternately up and down, and the cooling water channels 3 are connected sequentially through the connecting pipes 6 to form a cooling water baffle channel.

[0025] Working process of this invention: In the operation of this invention, a heat pipe-type low-temperature economizer with a triple-isolation structure is used. During operation, the heat from the flue gas is absorbed by the evaporation section of the heat pipe 1 and conducted to the condensation section. The heat from the condensation section is then transferred to the cooling water in the condensing jacket 2. In this process, the condensing jacket 2 achieves the first layer of physical isolation between the condensation section of the heat pipe 1 and the shell. The sealing partition 4 achieves the second layer of physical isolation between the flue gas side and the water side of the shell, forming the main sealing surface. The elastic sealing layer 5, through its own flexibility, eliminates the stress in the pipe hole area of ​​the sealing partition 4, ensuring the long-lasting and reliable seal at this location, thus forming the third layer of physical isolation and sealing guarantee. The combined effect of these three structures fundamentally improves the sealing reliability, operational stability, and service life of the equipment.

[0026] The elastic sealing layer 5 is made of high-temperature and corrosion-resistant elastic sealing material, forming a dynamic and compressible secondary seal that can effectively absorb and compensate for the relative displacement and stress between the heat pipe 1 and the sealing partition 4 caused by thermal expansion and contraction or equipment operation vibration, and prevent cracks or leaks in the pipe hole area of ​​the sealing partition 4 due to stress concentration.

[0027] The heat pipe 1 has spiral fins on the outside of the condensation section. The surface of the spiral fins has several turbulence holes or pits, which can further disrupt the laminar boundary layer of the fluid, induce Karman vortex street or secondary flow, and greatly enhance convective heat transfer.

[0028] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the scope of protection of the present invention.

Claims

1. A heat pipe-type low-temperature economizer with a triple-isolation structure coupling, characterized in that: It includes several heat pipes (1), several condenser sleeves (2), a sealing partition (4) and an elastic sealing layer (5). The sealing partition (4) is provided with a fixed and sealed heat pipe (1). The condensing section of the heat pipe (1) is provided with a condenser sleeve (2). The condenser sleeve (2) and the outer wall of the heat pipe (1) form an annular closed cooling water channel (3). Two adjacent cooling water channels (3) are connected by a connecting pipe (6). The lower side of the sealing partition (4) is provided with an elastic sealing layer (5) on the heat pipe (1). The condenser sleeve (2), the sealing partition (4) and the elastic sealing layer (5) together constitute a triple isolation and sealing structure.

2. The triple-isolation structure coupled heat pipe type low-temperature economizer as described in claim 1, characterized in that: It also includes a clamping plate (7) that is pressed on the underside of the elastic sealing layer (5) and fitted onto the heat pipe (1).

3. The heat pipe-type low-temperature economizer with triple-isolation structure coupling as described in claim 1, characterized in that: The two ends of the hydrocondensation sleeve (2) are fixedly and sealed to the heat pipe (1) by welding or mechanical means.

4. The heat pipe-type low-temperature economizer with triple-isolation structure coupling as described in claim 1, characterized in that: Each heat pipe (1) is provided with a connecting sleeve (9).

5. A heat pipe-type cryogenic economizer with a triple-isolation structure coupling as described in claim 4, characterized in that: The portion of the connecting sleeve (9) that passes through the sealing partition (4) is statically sealed to the sealing partition (4) by welding or mechanical means.

6. The triple-isolation structure coupled heat pipe type low-temperature economizer as described in claim 4, characterized in that: The diameter of the through hole (8) on the elastic sealing layer (5) through which the connecting sleeve (9) passes is smaller than the outer diameter of the connecting sleeve (9).

7. The triple-isolation structure coupled heat pipe type low-temperature economizer as described in claim 1, characterized in that: The heat pipe (1) has a spiral fin on the outside of the condensation section. The surface of the spiral fin has several turbulence holes or pits. The spiral helix angle of the spiral fin is 30 to 45 degrees.

8. A heat pipe-type cryogenic economizer with triple-isolation structure coupling as described in any one of claims 1 to 7, characterized in that: The connecting pipes (6) are arranged alternately up and down, and the cooling water channels (3) are connected in sequence through the connecting pipes (6) to form a cooling water baffle channel.

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