Low-temperature evaporation and concentration system

Abstract

The invention provides a low-temperature evaporation and concentration system and relates to the field of evaporation and concentration. The system comprises an evaporation chamber used for material evaporation, a condensation chamber, a vacuum pump, a refrigerant condenser, a refrigerant evaporator, a throttling device and a compressor, wherein the evaporation chamber is communicated with the condensation chamber, the vacuum pump is connected with the evaporation chamber or the condensation chamber, the refrigerant condenser is arranged in the evaporation chamber, and the refrigerant evaporator is arranged in the condensation chamber; a refrigerant outlet of the refrigerant evaporator is connected with one end of the compressor, a refrigerant inlet of the refrigerant condenser is connected with the other end of the compressor, a refrigerant inlet of the refrigerant evaporator is connected with one end of the throttling device, and a refrigerant outlet of the refrigerant condenser is connected with the other end of the throttling device. According to the system, the discharge temperature of the compressor is adjusted through the throttling device, so that a material can be evaporated and condensed at the lower temperature.

Description

technical field [0001] The invention relates to the field of evaporation concentration, in particular to a low-temperature evaporation concentration system. Background technique [0002] Evaporation and concentration process is widely used in chemical, pharmaceutical, wastewater treatment and other industries, the purpose is to remove the moisture in the material, to achieve the purpose of extracting solid products in the material or reducing the amount of the material. Most of the current methods are multi-effect evaporation and mechanical vapor recompression. The obvious disadvantages of the former are large steam consumption and low energy utilization rate. The latter recovers the secondary steam through the steam compressor, which greatly improves the energy utilization rate. , and is currently the most energy-saving and environmentally friendly evaporation method. But when the evaporating temperature is low, the efficiency of the compressor will drop significantly, and...

AI Technical Summary

Problems solved by technology

Most of the current practice is to use multi-effect evaporation and mechanical vapor recompression. The obvious disadvantages of the former are large steam consumption and low energy utilization rate. The latter recovers secondary steam through the steam compressor, which greatly improves the energy utilization rate. , and is currently the most energy-saving and environmentally friendly evaporation method

However, when the evaporation temperature is low, the efficiency of the compressor will drop significantly, and the evaporation efficiency of the system will also decrease accordingly.

For some materials that need to be evaporated at low temperature, such as heat-sensitive materials, if the evaporation temperature is too high, its properties will change, and the use of mechanical vapor recompression will greatly reduce its evaporation efficiency.

[0003] In the chemical and pharmaceutical fields, there are a large number of heat-sensitive substances and substances with high boiling point temperature rise. For heat-sensitive substances, if the temperature is too high during the evaporation and concentration process, their properties will change; for some high-boiling point For substances with temperature rise, the temperature rise of the boiling point increases with the increase of evaporation temperature. If the evaporation temperature is high, the system will consume a lot of energy.

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