Vertical-type electric dryer

Abstract

The invention discloses a vertical-type electric dryer. The vertical-type electric dryer comprises a drying barrel, a feeding channel, a discharging channel and an air exhausting pipe. The feeding channel and the air exhausting pipe are arranged at the top of the drying barrel. The vertical-type electric dryer is characterized in that an electric heating cone combination device, a cooling cone combination device and a convection ventilating device are further sequentially arranged inside the drying barrel from top to bottom; the electric heating cone combination device, the cooling cone combination device and the convection ventilating device are connected with the drying barrel; gaps are both reserved between the electric heating cone combination device and the drying barrel as well as between the cooling cone combination device and the drying barrel; and the upper area and the lower area, corresponding to the gaps, of the inside of the drying barrel form a convection channel. The vertical-type electric dryer has the remarkable advantages of being high in heat exchange efficiency, small in energy consumption, high in applicability, economical, environmentally friendly and the like. The vertical-type electric dryer can effectively replace various sorts of existing vertical-type dryers and is suitable for drying various block-shaped or granular powdered raw materials like cementraw materials, slag, pulverized fuel ash and coke, and the application prospects are broad.

Description

technical field [0001] The invention relates to a drying equipment for industrial raw materials, in particular to a vertical drying machine suitable for drying lumpy or powdery raw materials such as cement raw materials, slag, fly ash and coke. Background technique [0002] As we all know, in the cement production process, the production raw materials are generally dried and processed so that the water content of the production raw materials meets the requirements of the cement production process technical standards before they can be put into production and use. This is the basic prerequisite for the production of qualified cement products. At present, the mainstream drying equipment used by cement production enterprises is a vertical dryer, a typical example is the vertical dryer disclosed in Chinese Patent No. 03234469.4. However, it has been found in practice that such vertical dryers generally have the following problems: (1) heating devices such as hot blast stoves are...

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Problems solved by technology

However, it has been found in practice that such vertical dryers generally have the following problems: (1) heating devices such as hot blast stoves are provided, and coal-fired heating is used for heating, resulting in serious pollution; (2) heating devices such as hot blast stoves are installed in vertical dryers At the bottom of the dryer, the temperature of the lower part of the shell (also known as the drying cylinder) is very high, but the temperature of the upper part is difficult to guarantee, especially when the wet material first enters, the wet material that enters initially absorbs a large amount of heat, and the surface is quickly evaporated and dried , a large amount of water vapor is generated. At this time, the material will continue to absorb heat during the falling process. The heat lost in the upper part of the shell cannot be quickly compensated, and the local temperature drops significantly. When the follow-up wet material is continuously fed into the shell, due to the The local temperature is low, and the surface of the wet material can no longer be dried and heated immediately. After the low-temperature wet material is mixed with water vapor, the water vapor in the water vapor recondenses and liquefies to form a slurry with the wet material, which has poor dispersion and high viscosity. It is easy to cause material blockage; (3) Since the heating device is set at the bottom of the shell, the temperature of the material cannot be cooled during the falling process, resulting in a high temperature of the material after drying. On the one hand, it is easy to burn the transportation equipment or burn the operator; On the one hand, a large amount of heat is taken away by the discharge material, the heat loss is serious, and the energy consumption is high; (4) the heating device is arranged at the bottom of the shell, and the heat exchange between the heat source and the material mainly depends on the remote radiation and convection of the heat of the heating device. Low exchange efficiency, low heat utilization efficiency, and high energy consumption; (5) Since coal is used as fuel, some chemical gases and dust are inevitably generated during the combustion process, which is easy to pollute the drying materials, so its applicability restricted

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