Waste heat recovery type evaporative crystallization device

Abstract

The invention discloses a waste heat recovery type evaporative crystallization device. The evaporative crystallization device is characterized by comprising an evaporation kettle and a waste heat recovery tower, wherein a heat tube is arranged in the waste heat recovery tower, the hot end of the heat tube is arranged in the waste heat recovery tower, the cold end of the heat tube is arranged in the evaporation kettle, a cyclone separator is arranged at the top of the waste heat recovery tower, an ash discharge hole of the cyclone separator is directly communicated with an inner cavity of the waste heat recovery tower, a distributor is arranged at the top of the evaporation kettle, and an air tube is arranged at the bottom of the waste heat recovery tower to introduce updrafts into the waste heat recovery tower. Compared with the prior art, the evaporative crystallization device has the advantages that via large heat flux of heat conduction of the heat tube, a solution can be evaporated instantly, so that a continuous production effect can be achieved, and a difficulty of traditional intermittent production with operation on evaporative crystals is broken; in addition, with such design, traditional 'waste heat' in a solid phase is efficiently recovered and utilized, and multiple heat transfer manners coexist, so that the heat transfer effect is excellent, the energy utilization rate is high, and effects of energy conservation and environment protection are achieved.

Description

technical field [0001] The invention relates to the field of evaporation and crystallization devices, in particular to a waste heat recovery type evaporation and crystallization device. Background technique [0002] The usual method for drying powdery or fine granular materials is to use the gas-phase high-temperature heat medium to directly contact the material, blow the particles up through the high-speed flowing heat medium, and take the water away directly from the gas phase after vaporization and evaporation. The heat in the final gas phase is easy to reuse, but the heat left in the solid phase is often allowed to dissipate because it is difficult to recover. Existing devices rarely have waste heat recovery devices for solid materials. The following problems exist in the operation of recovering waste heat from solid materials: the solid material has poor fluidity and heat convection effect; direct contact heat exchange can overcome the defect of poor fluidity, but it w...

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Problems solved by technology

The following problems exist in the operation of recovering waste heat from solid materials: the solid material has poor fluidity and heat convection effect; direct contact heat exchange can overcome the defect of poor fluidity, but it will bring some waste gas and fly ash in the solid material into the heat exchanger. In the heat medium, it causes the difficulty of secondary separation and purification; in addition, there are many schemes that adopt intermittent operation, which has low production efficiency and limited output

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