Air preheater of oscillatory flow type heat pipe, and energy saving drying technique of using the preheater

Abstract

An energy- saving dry process using air preheater of oscillation stream heat tube includes sending wet material into dryer by conveying device, preheating natural air by said air preheater then using blower to pressurize it and to send it to heat exchanger, heating air to be required temperature and sending it to dryer for drying material in dryer, discharging dried material out from dryer and conveying it together with dried powder collected from cyclone dust remover to final product area, sending tail gas from dryer to said air preheater through draught fan after it is purified by said dust remover and using it to preheat drying media then exhausting it to the air.

Description

technical field

[0001] The invention relates to a drying system waste heat recovery technology, in particular to an oscillating flow heat pipe air preheater and an energy-saving drying process using the same. Background technique

[0002] At present, in the drying or calcination system, the tail gas temperature is generally higher than 100°C. The moisture contained in the tail gas exists in a gaseous state, part of which comes from the air used for drying, and most of the rest is the moisture removed from the wet material. If it is directly emptied, a large amount of sensible heat and latent heat of water vapor carried in the exhaust gas will be lost, which will cause a great waste of energy. Since the tail gas also contains a certain amount of dust and is in a gaseous state, it is very difficult to recover the waste heat of the dry tail gas.

[0003] Usually, in the heat exchanger for waste heat recovery, because the heat transfer coefficient of exhaust gas is low, the he...

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