A microwave energy-saving drying method and device for sludge and coal slime

Abstract

A microwave energy-saving drying method for sludge and coal slime and its device, the method comprising: passing microwaves and heated air into the rotor dryer box; microwaves heat the material to reduce its viscosity, hot air heats the surface, and the rotor is mixed and heated. Disperse it; after drying, the material is output from the closed-air discharge valve, and the hot and humid air is discharged from the box. It first passes through the cyclone dust collector to remove dust, and then enters the heat-absorbing end of the heat pipe exchanger to cool down. The medium-temperature and high-humidity hot air flows out, and then enters the heat pump unit After dust removal, cooling, and dehumidification, it becomes a low-temperature and low-humidity hot gas; then absorbs heat energy output from the outlet of the heat pump unit, and becomes a medium-temperature and low-humidity hot gas; passes through the heat pipe exchanger to absorb heat and heat up, and becomes a medium-high temperature and low-humidity hot gas; It is heated in a heating furnace and becomes hot gas with high temperature and low humidity. The device includes: a heating furnace, a microwave rotor dryer, a cyclone dust collector, a heat pipe exchanger, a heat pump unit, and a dust cover. The invention has the advantages of high efficiency, environmental protection and good reliability.

Description

technical field [0001] The invention belongs to the technical field of sludge and coal slime drying, and specifically relates to an energy-saving drying method and device for drying sludge, coal slime and other viscous materials by mixing microwaves and hot air, and recovering and utilizing the heat energy in the discharged moisture. Background technique [0002] At present, there is a rotor drying technology and equipment widely used in the field of sludge and coal slime drying, as described in patent CN101885573: a device and process for treating wet sludge using boiler waste heat. The belt device and the smoke exhaust treatment device are connected. The key points of the structure are that the flue of the smoke exhaust treatment device is connected with the dryer, the induced draft fan, and the cyclone separator respectively. The side of the dryer is connected with the sludge storage bin, and the finished product bin It is connected with the coal conveying belt device thr...

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Problems solved by technology

[0003] Since the sludge and peat materials have a water content of about 30-40% after mechanical dehydration, the sludge has fine particle size, high viscosity, and low calorific value. The above-mentioned patented methods and products have shortcomings in the drying of sludge and coal slime. It is: 1. The dispersion of the material is poor, the material is not easy to be scattered by the rotor, the surface of the material is easy to dry when it is in contact with the air, and the inner core is not easy to dry; 2. Due to the high temperature of the flue gas in the dryer cavity, the surface of the material is too dry, and the inner core is not easy to dry. Drying, resulting in waste of excess hot flue gas energy in the dryer; 3. Direct discharge of moisture carrying a large amount of heat energy not only causes a large amount of heat energy loss, but also causes high temperature moisture and internal harmful gases to pollute the environment

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