Device and process for drying/decomposing solid materials

Abstract

The invention discloses a device and process for drying / decomposing solid materials. The device for drying / decomposing the solid materials comprises a reactor and a combustion device, wherein combustible substances and combustion-supporting gas are combusted through the combustion device so that a certain temperature of the reactor is remained; and the solid materials are introduced into the reactor with the combustion-supporting gas so that the solid materials are dried or decomposed by using heat generated in the combustion of the combustible substances. According to the device and process for drying / decomposing the solid materials in the invention, the reaction efficiency is improved without extra heat sources and the problem that the solid materials are agglomerated is alleviated.

Description

technical field [0001] The present invention relates to the field of processing solid materials, in particular, to a device and process for drying or decomposing solid materials. Background technique [0002] A fluidized bed is a device that uses gas or liquid to pass through a granular solid layer to keep the solid particles in a suspended motion state to process solid particles. Fluidized beds can be applied in many fields, among which, fluidized bed dryers and fluidized bed reactors are the more common types. [0003] For the fluidized bed dryer, the solid material is added to the fluidized bed dryer through the feeder, and the filtered clean air is heated and sent to the bottom of the fluidized bed by the blower to contact with the solid material through the distribution plate to form a fluidized state. Gas-solid heat and mass exchange. After the material is dried, it is discharged from the discharge port, and the waste gas is discharged from the top of the fluidized b...

AI Technical Summary

Problems solved by technology

For the sake of safety, in the fluidized bed reactor, the gas usually cannot be in direct contact with the air, so the indirect heating method of the heat exchanger is required. This method is affected by the heat exchange area of ​​the heat exchanger, and is related to the pressure of the gas, There is a certain relationship between temperature and volume, so heating the gas to the temperature required for the reaction requires high energy consumption

Moreover, after the hot gas is passed into the reactor, since the specific heat capacity of the solid material is much greater than that of the gas, a large amount of hot gas is needed to heat the material, and it is also difficult to control the temperature in the reactor in this way

The tail gas after the reaction will also take away a lot of heat, resulting in waste of heat

If the temperature required for the reaction is maintained by heating the fluidized bed reactor, the heat exchange area is the inner wall of the reactor, and it is difficult to heat the gas and solid materials to a sufficient temperature

If the combination of heating reactor and heating gas is used, the equipment will be more complicated. Similarly, the tail gas after the reaction will also take away a lot of heat, resulting in waste of heat and increased energy consumption.

[0005] Therefore, when the traditional method is used to transport solid materials into the fluidized bed, it is likely to bring in air, which is prone to danger. Therefore, it is necessary to build a special material delivery system to avoid bringing air into the reactor, but in this way Will make the whole system more complicated and increase the cost

Images