Flue gas waste heat exhaust recovery device

By installing a spiral heat exchange pipe in the boiler flue of the thermal power plant for heat exchange of smoke and water, recycling and utilizing the waste heat of flue gas, the problem of flue gas heat loss is solved, and efficient heat utilization and environmentally friendly hot water transportation method are achieved.

CN222864978UActive Publication Date: 2025-05-13YUFENG IND GRP CO LTD
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Patent Information

Application Number
CN202421491258.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-27
Publication Date
2025-05-13
Estimated Expiration
2034-06-27

AI Technical Summary

Technical Problem

The main part of the energy loss caused by the flue gas heat loss in boilers in thermal power plants, and the prior art is difficult to effectively utilize these waste heat.

Method used

设计一种烟气余热排气回收装置,通过螺旋状换热管在锅炉烟道部进行烟水热交换,将烟气余热转换为热水,并通过循环泵输送至生产车间进行热交换,进一步降低热水温度以供烘干物料使用。

Benefits of technology

It realizes the effective recycling and utilization of waste heat of flue gas, reduces heat emissions, does not pollute the atmosphere, is more applicable, and is suitable for a variety of use scenarios.

✦ Generated by Eureka AI based on patent content.

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    Figure CN222864978U_ABST
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Abstract

The utility model discloses a flue gas waste heat exhaust recycling device, and belongs to the technical field of waste heat recycling. The system comprises a smoke-water heat exchange mechanism and a gas-water heat exchanger, a spiral heat exchange pipe of the smoke-water heat exchange mechanism is mounted at a boiler flue part; the water inlet end of the spiral heat exchange tube is connected with the water outlet end of the gas-water heat exchanger; the water outlet end of the spiral heat exchange pipe is connected with the water inlet end of the gas-water heat exchanger through the circulating pump; the smoke-water heat exchange mechanism comprises a spiral heat exchange pipe and a heat exchange shell, and the heat exchange shell is installed on a boiler flue; a spiral groove is formed in the inner wall of the heat exchange shell, and the spiral heat exchange pipe is located in an inner cavity of the heat exchange shell. And the centers of the adjacent spiral layers of the spiral heat exchange tube are deviated. The flue gas waste heat is led to a production workshop through hot water for heat exchange, the atmosphere cannot be polluted, the hot water conveying mode can be suitable for various use scenes, and the applicability is higher.
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Description

Technical Field

[0001] The utility model provides a flue gas waste heat exhaust recovery device, belonging to the technical field of waste heat recovery and utilization. Background Art

[0002] Thermal power plant boilers are important equipment for converting fossil fuels into thermal energy, and flue gas heat loss is the main part of the energy loss of thermal power plants. Utility Model Content

[0003] In order to solve the problems existing in the background technology, the utility model discloses a flue gas waste heat exhaust recovery device, which introduces the flue gas waste heat to the production workshop through hot water for heat exchange, does not pollute the atmosphere, and the hot water delivery method can be applied to a variety of usage scenarios, with stronger applicability.

[0004] The utility model adopts the following technical solutions to achieve the above technical effects:

[0005] A flue gas waste heat exhaust recovery device comprises a flue gas-water heat exchange mechanism and an air-water heat exchanger; the spiral heat exchange tube of the flue gas-water heat exchange mechanism is installed in the flue of the boiler; the water inlet end of the spiral heat exchange tube is connected to the water outlet end of the air-water heat exchanger; the water outlet end of the spiral heat exchange tube is connected to the water inlet end of the air-water heat exchanger through a circulation pump;

[0006] The flue gas-water heat exchange mechanism comprises a spiral heat exchange tube and a heat exchange shell, wherein the heat exchange shell is installed on the boiler flue; the inner wall of the heat exchange shell is provided with a spiral groove, and the spiral heat exchange tube is located in the inner cavity of the heat exchange shell.

[0007] Furthermore, the water inlet of the spiral heat exchange tube is located above the water outlet.

[0008] Furthermore, a corrosion-resistant layer is provided on the outer wall of the spiral heat exchange tube.

[0009] Furthermore, the centers of adjacent spiral layers of the spiral heat exchange tube are offset.

[0010] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0011] 1. The utility model reduces the temperature of flue gas, thereby heating circulating water to 100°C, and transports it to the production workshop through a hot water circulation pump. An air-water heat exchanger is set in the production workshop, and hot water and air are heat-exchanged in the air-water heat exchanger, thereby reducing the temperature of hot water and heating the air for use in drying materials in the workshop.

[0012] 2. After the implementation of the utility model, the heat emission can be reduced, and no pollution is generated to the atmosphere. The hot water delivery method can be applied to a variety of usage scenarios and has stronger applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a simplified structural diagram of an embodiment of the utility model;

[0014] Figure 2 It is a simplified structural diagram of the smoke-water heat exchange mechanism in the embodiment of the utility model.

[0015] In the figure: 1. smoke-water heat exchange mechanism, 2. circulation pump, 3. hot water pipe, 4. air-water heat exchanger, 5. spiral groove, 6. spiral heat exchange tube, 7. water inlet, 8. water outlet. DETAILED DESCRIPTION

[0016] Below, the utility model is further described in conjunction with the accompanying drawings.

[0017] A flue gas waste heat exhaust recovery device comprises a flue gas-water heat exchange mechanism and an air-water heat exchanger; the spiral heat exchange tube of the flue gas-water heat exchange mechanism is installed in the flue of the boiler; the water inlet end of the spiral heat exchange tube is connected to the water outlet end of the air-water heat exchanger; the water outlet end of the spiral heat exchange tube is connected to the water inlet end of the air-water heat exchanger through a circulation pump;

[0018] The flue gas-water heat exchange mechanism comprises a spiral heat exchange tube and a heat exchange shell, wherein the heat exchange shell is installed on the boiler flue; the inner wall of the heat exchange shell is provided with a spiral groove, and the spiral heat exchange tube is located in the inner cavity of the heat exchange shell.

[0019] Furthermore, the water inlet of the spiral heat exchange tube is located above the water outlet.

[0020] Furthermore, a corrosion-resistant layer is provided on the outer wall of the spiral heat exchange tube.

[0021] Furthermore, the centers of adjacent spiral layers of the spiral heat exchange tube are offset.

[0022] The following is a more specific embodiment:

[0023] Reference Figure 1 and Figure 2 In this embodiment, a portion of the spiral layers of the spiral heat exchange tube deviates to the left, and another portion of the spiral layers deviates to the right, and the portions deviating to the left and the portions deviating to the right are arranged at intervals; through the configuration of the spiral layers, the contact area of ​​the flue gas is increased, and the heat exchange efficiency is further increased. The arrangement of the spiral grooves on the inner wall of the shell and the well-arranged structure of the spiral heat exchange tube can evenly balance the temperature of the hot flue gas passing through the shell, and can more fully contact the flue gas.

[0024] The spiral heat exchange tube of the flue gas-water heat exchange mechanism is installed in the boiler flue; the water inlet end of the spiral heat exchange tube is connected to the water outlet end of the gas-water heat exchanger; the water outlet end of the spiral heat exchange tube is connected to the water inlet end of the gas-water heat exchanger through a circulating pump.

[0025] By applying a corrosion-resistant layer on the spiral heat exchange tube, the corrosion of the spiral heat exchange tube by acidic gas in the flue gas can be effectively prevented.

Claims

1. A flue gas waste heat exhaust recovery device, characterized in that: It includes a smoke-water heat exchange mechanism and an air-water heat exchanger; the spiral heat exchange tube of the smoke-water heat exchange mechanism is installed in the flue of the boiler; the water inlet end of the spiral heat exchange tube is connected to the water outlet end of the air-water heat exchanger; the water outlet end of the spiral heat exchange tube is connected to the water inlet end of the air-water heat exchanger through a circulation pump; The flue gas-water heat exchange mechanism comprises a spiral heat exchange tube and a heat exchange shell, wherein the heat exchange shell is installed on the boiler flue; the inner wall of the heat exchange shell is provided with a spiral groove, and the spiral heat exchange tube is located in the inner cavity of the heat exchange shell.

2. The flue gas waste heat exhaust recovery device according to claim 1, characterized in that: The water inlet of the spiral heat exchange tube is located above the water outlet.

3. The flue gas waste heat exhaust recovery device according to claim 1, characterized in that: The outer wall of the spiral heat exchange tube is provided with a corrosion-resistant layer.

4. The flue gas waste heat exhaust recovery device according to claim 1, characterized in that: The centers of adjacent spiral layers of the spiral heat exchange tube are offset.