Method for directly recycling waste gas and waste heat of dryer by utilizing compression heat pump

Abstract

The invention discloses a method for directly recycling waste gas and waste heat of a dryer by utilizing a compression heat pump, which aims at resolving the problem of circulation recycling of waste gas and waste heat. The method comprises the following processes: 1 washing process, introducing waste heat steam discharged from the dryer into a washing tower for washing; 2 flash process, introducing condensation water obtained by liquefying saturation steam for heating materials in the dryer into a flash tank for flashing to obtain a certain amount of steam; 3 compression process, mixing the flashed steam and the washed water steam and introducing the mixture into a compressor for compression to obtain overheated steam; 4 humidifying process, introducing the overheated steam into a humidifier and humidifying the steam into the saturation steam by adopting the condensation water; and 5 circulation process, mixing the humidified saturation steam with steam from a steam main pipe and returning the mixture to the dryer for recycling. By means of the method for energy recycling, about 65% to 70% of saturation steam can be saved.

Description

technical field [0001] The invention belongs to the new technology of energy saving and environmental protection in the field of drying technology, and specifically relates to a method for directly recycling waste heat of exhaust gas in a conduction dryer by using a compression heat pump. Background technique [0002] The technical problem to be solved by the present invention is to provide a new technology for directly recycling the waste gas heat and condensate heat of the conduction dryer by using a compression heat pump. Material drying is one of the important production processes in many industries. Its purpose is to use heat to remove moisture from products or semi-finished products, making materials easier to transport, store or further process and use. Dryers can be divided into conduction, convection, radiation, high-frequency and microwave according to the heating method. The conduction dryer is also called the direct dryer. It uses the conduction method to transfe...

AI Technical Summary

Problems solved by technology

Dryers can be divided into conduction, convection, radiation, high-frequency and microwave according to the heating method. The conduction dryer is also called the direct dryer. It uses the conduction method to transfer heat from the heat source through the wall to the wet material. The secondary steam contains a lot of heat, and most of the current drying industry directly discharges this steam, resulting in a great waste of resources and environmental pollution, and the energy utilization rate needs to be improved urgently

For this reason, some engineers and technicians have explored the recycling of secondary steam. The main method is the oscillating flow heat pipe heat exchanger, which uses the oscillating flow heat pipe heat exchanger to recover waste heat. The self-excited oscillating flow heat pipe is an efficient heat transfer method. The high-efficiency oscillating flow heat pipe heat exchanger developed by using this heat pipe can be used for waste heat recovery of dry tail gas, but the waste heat cannot be fully recycled, the recovery rate is not high, and the equipment cost is relatively large

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