Smoke rotational flow condensation type heat exchange device and method for aluminum oxide calcining kiln

Abstract

The invention provides a smoke rotational flow condensation type heat exchange device and method for an aluminum oxide calcining kiln. The smoke rotational flow condensation type heat exchange device comprises a fan, sprayers, a chimney, a fog receiver, a water recycling tank, an overflow pipe, a dust collector, a hot water pump, a cold water pump, spiral flow guide plates, an air pipe and a user. The smoke rotational flow condensation type heat exchange method comprises the steps that 150-170 DEG C hot and wet smoke from the aluminum oxide calcining kiln enters the lower portion of a condensation heat-exchange tower through the fan and the air pipe, and operates upwards after passing the spiral flow guide plates; and after spraying convective heat exchange through the sprayers, cooling water is heated to 80 DEG C from 50 DEG C and then joints condensate water in the smoke, and afterwards, mixed water is delivered to the user to be used through the hot water pump after entering the water recycling tank. The smoke rotational flow condensation type heat exchange device and method have the advantages that recycled hot water can be used for washing of red mud and a flat plate in aluminum oxide production, or heating for the user, or ORC waste heat power generation. 80%-90% or above of the heat in the moisture-heat-containing smoke can be recycled, and the economic benefit and the effects of energy conservation, emission reduction and environmental protection are significant.

Description

Technical field: [0001] The invention relates to the technical field of furnace flue gas waste heat utilization process equipment, in particular to an alumina roasting kiln flue gas heat exchange device and method. Background technique: [0002] In the prior art, aluminum hydroxide roasting is the last process in the alumina production process. This process is mainly to pass aluminum hydroxide containing about 6% of attached water and 35% of lattice water through a roasting furnace at a temperature of about 1200 ° C. Aluminum hydroxide is dehydrated at high temperature to form alumina. In the production process, coal gas or natural gas is used to burn and heat up to complete the dehydration of aluminum hydroxide. During the dehydration process, a large amount of water fume will be generated, and the temperature of water fume is basically at 150 Between ℃ and 170 ℃, the moisture content of the flue gas is about 40% to 50%. The moisture exists in the flue gas in the form of w...

AI Technical Summary

Problems solved by technology

Such a large amount of wet and hot flue gas takes away more heat and moisture, resulting in energy loss of the alumina roasting kiln system, resulting in high alumina production costs and high energy consumption

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