Anti-freezing heat pipe air heater system

Abstract

The utility model provides a kind of anti-freezing heat pipe air heater system, belong to air heater technical field, it can at least partially solve the existing hot water or low-temperature heating system of six steam extraction or flue gas waste heat heating of steam turbine, in winter, often frozen, resulting in air heater freeze pipe phenomenon, air heater freeze pipe rupture will lead to air heater condensate leakage, harm the operation of air preheater, and air heater condensate leakage cannot be overhauled online, only the problem of ungrouping, the utility model includes:including:air heater, the anti-freezing air heater of the air heater air inlet side and booster pump are arranged, beneficial effect is: the air heater air inlet side is provided with anti-freezing air heater, cold air into air heater can be preheated, to prevent hot water in air heater freeze.

Description

Technical Field

[0001] This utility model belongs to the field of heater technology, specifically relating to an antifreeze heat pipe heater system. Background Technology

[0002] In northern my country, a warm air heater is usually installed at the inlet of the air preheater to increase the cold end wall temperature of the air preheater and prevent low-temperature corrosion and ash blockage at the cold end of the air preheater.

[0003] However, in related technologies, some power plants have changed the heat source of the air heaters to fifth-stage or even sixth-stage steam extraction from the turbine, while others have changed it to hot water heated by flue gas waste heat, and still others have changed it to hot water from the low-pressure heater system. Regardless of the modification, all have significantly reduced the energy consumption of the air heaters, achieving energy conservation and emission reduction. However, in actual operation, it has been found that the energy-saving effect is not significant when using fifth-stage steam extraction from the turbine; while when using sixth-stage steam extraction from the turbine, hot water heated by flue gas waste heat, or hot water from the low-pressure heater system, freezing often occurs in winter, leading to frozen pipes in the air heaters. When these frozen pipes rupture, condensate leakage occurs, jeopardizing the operation of the air preheater. Furthermore, condensate leakage cannot be repaired online and must be disconnected, further jeopardizing the operation of the air preheater. Therefore, we propose an anti-freeze heat pipe air heater system. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art and to provide an antifreeze heat pipe heater system.

[0005] This utility model provides a freeze-proof heat pipe heater system, including: Heater, including finned tubes; An antifreeze heater, installed on the air inlet side of the heater and connected to it, is used to preheat the cold air entering the heater during operation; and A booster pump is connected to the hot water inlet of the heater to deliver hot water into the heater during operation.

[0006] Furthermore, the inlet of the booster pump is connected to the hot water outlet pipeline of the external steam turbine regenerative system.

[0007] Specifically, the antifreeze heater includes a thermal resistance heat exchange tube.

[0008] Specifically, the thermal resistance heat exchange tube includes a steel tube and a thermal resistance material layer wrapped around the outer wall of the steel tube.

[0009] Preferably, the thermal resistance material layer is a rubber layer.

[0010] Specifically, the thermal resistance heat exchange tube is connected to the heater piping to receive hot water supplied by the heater during operation.

[0011] Furthermore, the heater is equipped with a first filter at its air inlet.

[0012] Furthermore, the antifreeze heater is equipped with a second filter at its air inlet.

[0013] Furthermore, the antifreeze heater also includes a cold water outlet.

[0014] Specifically, the air inlet of the antifreeze heater is connected to the air outlet pipe of an external blower, and the hot air outlet of the heater is connected to the air preheater pipe of an external air supply pipe.

[0015] The beneficial effects of this utility model are as follows: An antifreeze heater is installed on one side of the air inlet of the warm air heater, which can raise the temperature of the cold air to above -5°C, preventing the hot water in the traditional warm air heater from freezing. The antifreeze heater uses a material with thermal resistance wrapped around the traditional bare tube, raising the temperature of the cold air by 10°C to above -5°C. All other equipment is the same as the traditional warm air heater system, reducing the overall investment of the project. This system reduces the investment in antifreeze hot water warm air heaters, expands the application range of warm air heaters, and improves the stability and economy of warm air heaters. Attached Figure Description

[0016] Figure 1 This is a connection diagram of an antifreeze heat pipe heater system according to a specific embodiment of the present invention; Figure 2 This is a cross-sectional schematic diagram of the heat resistance heat exchange tube of an antifreeze heat pipe heater system according to a specific embodiment of the present invention. Among them, 1 is a warm air heater, 2 is an antifreeze warm air heater, 3 is an air supply duct, 4 is a booster pump, 5 is a steel pipe, and 6 is a thermal resistance material layer. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1 As shown in the figure, a frost-resistant heat pipe heater system provided by a specific embodiment of the present invention includes: a heater 1, including finned tubes; an frost-resistant heater 2, which is disposed on the air inlet side of the heater 1 and connected to the heater 1, for preheating the cold air entering the heater 1 during operation; and a booster pump 4, which is connected to the hot water inlet of the heater 1, for delivering hot water into the heater 1 during operation.

[0019] Specifically, the finned tubes of the heater 1 can transfer as much heat from the hot water to the air as possible within a limited volume, resulting in a higher outlet air temperature and more efficient heat energy utilization.

[0020] Furthermore, the antifreeze heater 2 is located on the air inlet side of the heater 1 to preheat the cold air entering the heater 1, preventing the cold air temperature from directly impacting the finned tube and causing the water inside the finned tube to freeze.

[0021] Furthermore, the booster pump 4 provides a stable and sufficient flow of hot water to the heater 1, ensuring that there is enough heat medium in the finned tube for heat exchange.

[0022] Based on the above basic implementation method, the inlet of the booster pump 4 is connected to the hot water output pipe of the external steam turbine regeneration system.

[0023] Specifically, the booster pump 4 delivers hot water from the external regeneration system to the air heater, and the heat is transferred from the hot water to the air through the finned tubes of the air heater.

[0024] In one specific embodiment, the antifreeze heater 2 includes a thermal resistance heat exchange tube.

[0025] In this embodiment, using a thermal resistance heat exchange tube can reduce the heat flux density, prevent hot water from releasing heat too quickly, and prevent the tube from freezing.

[0026] In another specific embodiment, such as Figure 2 As shown, the thermal resistance heat exchange tube includes a steel pipe 5 and a thermal resistance material layer 6 wrapped around the outer wall of the steel pipe; the thermal resistance material layer 6 is a rubber layer.

[0027] Specifically, the outer wall of the heat exchange tube is wrapped with a layer of thermal resistance material, which makes it difficult for heat inside the tube to be quickly lost to the outside; it also prevents cold air from causing the heat exchange tube to cool down too quickly and avoids icing.

[0028] Furthermore, the thermal resistance material layer 6 can also be made of silicone rubber, polyurethane foam, glass wool, rock wool-type insulation materials, foamed ceramics, or special polymer thermal insulation coatings.

[0029] In one specific embodiment, the thermal resistance heat exchange tube is connected to the piping of the air heater 1 to receive the hot water delivered by the air heater 1 during operation; the air heater 1 is provided with a first filter at the air inlet; the antifreeze air heater 2 is provided with a second filter at the air inlet.

[0030] In this embodiment, the second filter filters the air entering the antifreeze heater 2; the purpose is to ensure the cleanliness of the preheated air and protect the internal heat exchange structure of the antifreeze heater 2.

[0031] Specifically, the first filter further filters the cold air, removing dust and impurities; the purpose is to prevent impurities from clogging the gaps between the finned tubes, maintain heat exchange efficiency, and at the same time avoid dust accumulation causing corrosion or reducing air quality.

[0032] In another specific embodiment, the antifreeze heater 2 also includes a cold water outlet; the air inlet of the antifreeze heater 2 is connected to the air outlet pipe of an external blower, and the hot air outlet of the heater 1 is connected to the external air preheater pipe, which is the air supply pipe 3.

[0033] Furthermore, the cold water outlet of the antifreeze heater 2 is used to discharge the cooling water after heat exchange inside the antifreeze heater 2.

[0034] Furthermore, the antifreeze heater 2 is applicable to units with extreme ambient temperatures above -15℃.

[0035] To help better understand this utility model, a more comprehensive and specific embodiment of this utility model is described. In this embodiment, the utility model provides a frost-resistant heat pipe heater system, including: a heater 1, including finned tubes; a frost-resistant heater 2, disposed on the air inlet side of the heater 1 and connected to the heater 1, for preheating the cold air entering the heater 1 during operation; and a booster pump 4, connected to the hot water inlet of the heater 1 for delivering hot water into the heater 1 during operation.

[0036] In this embodiment, the inlet of the booster pump 4 is connected to the hot water output pipe of the external steam turbine regenerative system; the antifreeze heater 2 includes a thermal resistance heat exchange tube; the thermal resistance heat exchange tube includes a steel pipe 5 and a thermal resistance material layer 6 wrapped around the outer wall of the steel pipe 5; the thermal resistance material layer 6 is a rubber layer; the thermal resistance heat exchange tube is connected to the heater 1 pipe to receive the hot water delivered by the heater during operation; the heater 1 is provided with a first filter at its air inlet; the antifreeze heater 2 is provided with a second filter at its air inlet; the antifreeze heater 2 also includes a cold water outlet; the air inlet of the antifreeze heater 2 is connected to the air outlet pipe of the external blower, and the hot air outlet of the heater 1 is connected to the external air preheater pipe, which is the air supply pipe 3.

[0037] In summary, the embodiments disclosed herein have at least the following technical effects: Improve heat exchange efficiency: The heater 1 adopts a finned tube structure, which significantly increases the heat exchange area, making the heat exchange efficiency between hot water and air higher and ensuring the air heating effect. Antifreeze protection to ensure safety: An antifreeze heater 2 is installed on the air inlet side of heater 1 to preheat the incoming cold air, preventing the low-temperature cold air from directly impacting the finned tubes and causing icing or pipe freezing and cracking, thereby extending the service life of the equipment. Stable hot water delivery: The system is equipped with a booster pump 4, which can stably deliver hot water to the heater, ensuring sufficient heat medium in the finned tubes and avoiding uneven heat exchange or reduced efficiency due to insufficient flow. Energy conservation and waste heat utilization: The inlet of booster pump 4 is connected to the hot water outlet of the steam turbine regenerative system, which can make full use of the waste heat in the industrial production process, realize the recycling of energy, and reduce operating costs. Enhanced antifreeze performance: The antifreeze heater 2 adopts a thermal resistance heat exchange tube structure, with a thermal resistance material layer 6 wrapped around the outer wall, which effectively reduces heat loss, prevents cold air from causing the heat exchange tube to freeze, and improves the reliability of the system under low temperature conditions. Air purification and system protection: The air inlets of the heater 1 and the antifreeze heater 2 are respectively equipped with a first filter and a second filter, which can effectively remove dust and impurities in the air, prevent finned tube blockage, improve air quality and extend equipment life. Stable operation and easy maintenance: The antifreeze heater 2 is equipped with a cold water outlet, which facilitates the discharge and circulation management of cooling water, ensuring a continuous and stable heat exchange process, and also making it convenient for later inspection and maintenance.

[0038] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. A freeze-resistant heat pipe heater system, characterized in that, include: Heater, including finned tubes; An antifreeze heater is installed on the air inlet side of the heater and connected to the heater to preheat the cold air entering the heater during operation. as well as A booster pump is connected to the hot water inlet of the heater to deliver hot water into the heater during operation.

2. The antifreeze heat pipe heater system according to claim 1, characterized in that, The inlet of the booster pump is connected to the hot water output pipe of the external steam turbine regenerative system.

3. The antifreeze heat pipe heater system according to claim 1, characterized in that, The antifreeze heater includes a thermal resistance heat exchange tube.

4. The antifreeze heat pipe heater system according to claim 3, characterized in that, The thermal resistance heat exchange tube includes a steel tube and a thermal resistance material layer wrapped around the outer wall of the steel tube.

5. The antifreeze heat pipe heater system according to claim 4, characterized in that, The thermal resistance material layer is a rubber layer.

6. The antifreeze heat pipe heater system according to claim 4, characterized in that, The thermal resistance heat exchange tube is connected to the heater piping to receive hot water supplied by the heater during operation.

7. The antifreeze heat pipe heater system according to claim 1, characterized in that, The heater is equipped with a first filter at its air inlet.

8. The antifreeze heat pipe heater system according to claim 1, characterized in that, The antifreeze heater is equipped with a second filter at its air inlet.

9. The antifreeze heat pipe heater system according to claim 1, characterized in that, The antifreeze heater also includes a cold water outlet.

10. The antifreeze heat pipe heater system according to any one of claims 1 to 9, characterized in that, The air inlet of the antifreeze heater is connected to the air outlet pipe of an external blower, and the hot air outlet of the heater is connected to the air preheater pipe of an external air supply pipe.

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