Device and method for recycling flue gas waste heat of roasting furnace

Abstract

Disclosed are a device and a method for recycling flue gas waste heat of a roasting furnace. The device comprises a heat exchanger and a steam pocket. Fin heat exchange tubes are arranged in the heat exchanger, are filled with heating media and are communicated with the steam pocket through heating medium tubes. The steam pocket comprises a body and a center pipe positioned in the body, the body is filled with water, and the center pipe is communicated with the heating medium tubes. Primary heat exchange between flue gas of the roasting furnace and the heating media is performed in the heat exchanger, and then, secondary heat exchange between the heating media and the water in the steam pocket is performed in the center pipe. Heat in heating medium gas can be recycled through heat exchange, and thus, energy waste is not caused; the temperature of the heating media is high, and the heating media are vaporized during heat exchange, so that moisture condensation on the surfaces of the fin heat exchange tubes during heat exchange of the fuel gas in the heat exchanger is avoided, and heat exchange effect is guaranteed.

Description

technical field [0001] The invention belongs to the field of new energy sources, and in particular relates to a device and method for recovering waste heat from flue gas of an alumina roasting furnace. Background technique [0002] In the industrial process of alumina roasting, the exhaust gas temperature reaches 160-170°C, which takes away a lot of heat and causes a waste of energy. In order to save energy, the industry generally recovers waste heat. The usual method is to exchange heat between the flue gas and the cold water in the heat exchange tube in the heat exchanger, so that the heat in the flue gas is converted into heat in the water, and then the water is heated. user use. However, this way of heat exchange between flue gas and cold water usually causes condensation on the heat exchange surface due to the large temperature difference, making aluminum hydroxide powder or slurry adhere to the heat exchange surface of the heat exchanger, affecting the heat exchange e...

AI Technical Summary

Problems solved by technology

However, this way of heat exchange between flue gas and cold water usually causes condensation on the heat exchange surface due to the large temperature difference, making aluminum hydroxide powder or slurry adhere to the heat exchange surface of the heat exchanger, affecting the heat exchange effect , resulting in poor heat exchange, and the aluminum hydroxide powder or slurry attached to the surface of the heat exchange tube is also difficult to remove

Images