Method for recycling flue gas waste heat of alumina roasting furnace

A flue gas waste heat and recovery method technology, which is applied in heat exchange equipment, lighting and heating equipment, etc., can solve the problems that the temperature of hot water is not easy to control and affect the recovery effect of waste heat, so as to avoid flue gas temperature fluctuations and achieve good recovery effect Effect

Active Publication Date: 2010-12-15
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the latest technology is to use the method of direct heat exchange between water and flue gas for waste heat recovery. During the use process, due to the fluctuation of flue gas moisture content and flue gas temperature, the temperature of the hot water produced is not easy to control, which affects the effect of waste heat recovery.

Method used

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  • Method for recycling flue gas waste heat of alumina roasting furnace
  • Method for recycling flue gas waste heat of alumina roasting furnace

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Effect test

Embodiment 1

[0027] The recovery process adopts the method of direct heat exchange between water and flue gas, and the temperature of the water for direct heat exchange with the flue gas is 20°C, and the temperature difference between the temperature of the flue gas discharged after the heat exchange is 0.8°C, and the flue gas treatment capacity 1500Nm 3 / h, the inlet flue gas temperature is 156°C, and the water flow rate is 6.1 m 3 / h, the outlet water temperature is 76°C.

Embodiment 2

[0029] The recovery process adopts the method of direct heat exchange between water and flue gas, and the temperature of the water that directly exchanges heat with the flue gas is 21°C, and the temperature difference between the temperature of the flue gas discharged after the heat exchange is 1.0°C, and the flue gas treatment capacity 1505Nm 3 / h, the inlet flue gas temperature is 150°C, and the water flow rate is 6.4 m 3 / h, the outlet water temperature is 77°C.

Embodiment 3

[0031] The recovery process adopts the method of direct heat exchange between water and flue gas, and the temperature of the water for direct heat exchange with the flue gas is 35°C, and the temperature difference between the temperature of the flue gas discharged after the heat exchange is 1.5°C, and the flue gas treatment capacity 1510Nm 3 / h, the inlet flue gas temperature is 160°C, and the water flow rate is 14.5 m 3 / h, the outlet water temperature is 73°C.

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Abstract

The invention relates to a method for recycling the flue gas waste heat of an alumina roasting furnace. In a recycling process, a way of performing direct heat exchange between water and flue gas is adopted. The method is characterized in that: in the recycling process, difference between the temperature of water on which the direct heat exchange is performed together with the flue gas and the temperature of exhausted flue gas after the heat exchange is controlled to between 0 and 2 DEG C; and the volume ratio of the amount of the flue gas to the dosage of the water is 100:1-250:1. The method for recycling the flue gas waste heat of the alumina roasting furnace of the invention has the advantages of effectively controlling the parameters of the recycling process, achieving good waste heat recycling effects, effectively avoiding effects caused by the fluctuations of the moisture content and the temperature of the flue gas and effectively controlling the temperature of generated hot water.

Description

technical field [0001] The invention relates to a method for recovering waste heat from flue gas of an alumina roasting furnace. Background technique [0002] At present, in the alumina production process, saving energy and reducing consumption is an effective means to reduce production costs and improve economic benefits. A lot of work has been done on the research of energy-saving technology and process, among which the recovery of waste heat from flue gas of alumina roasting furnace is an important link. At present, the latest technology is to use the method of direct heat exchange between water and flue gas for waste heat recovery. During the use process, due to the fluctuation of flue gas moisture content and flue gas temperature, the temperature of the hot water produced is not easy to control, which affects the effect of waste heat recovery. . Contents of the invention [0003] The purpose of the present invention is to address the shortcomings of the above-mentio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F27/00
Inventor 张广任巨金
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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