MVR (Mechanical Vapor Recompression) system with external energy compensation

Abstract

The invention provides an MVR (Mechanical Vapor Recompression) system with external energy compensation and belongs to the technical field of industrial evaporation or concentration. The MVR system comprises a water inlet pump, a heat exchanger, a water inlet valve, a circulating water pump, an evaporator, a compensation heating device, an MVR steam compressor, a water outlet pump and the like. According to the MVR system, secondary steam is subjected to residual heat recycling by utilizing an MVR steam compressor and an external heat source is provided for startup and normal operation of an MVR steam compression and recycling system by adopting the compensation heating device, so that the startup problem of an existing MVR evaporation and concentration system is solved, the problem that the persistence is poor, caused by the fact that zero loss cannot be realized is solved, and disadvantages that raw steam is directly introduced so that steam with different pressure is inconvenient tomix and switch and the like are also overcome, so that the stability, persistence, reliability and efficiency of the operation of the MVR system are effectively improved. The whole system has the advantages of small size, low cost, less energy requirements, simplicity in operation, energy saving and environment protection and the like and is very suitable for being popularized and applied in a large scale.

Description

technical field [0001] The invention relates to an MVR evaporation or concentration system, in particular to an MVR system with external energy compensation. It belongs to the technical field of industrial evaporation or concentration. Background technique [0002] At present, MVR technology is widely used in the fields of seawater desalination, wastewater treatment, salt production, emulsion concentration, papermaking and distillation. In the process of product manufacturing, processes such as steam concentration, evaporation crystallization, and low-temperature evaporation are required, and the concentration and crystallization of solutions are mostly realized by industrial steam. Traditional evaporators such as single-effect or multi-effect evaporators have low thermal efficiency. , high power consumption, high operating costs, waste of resources and a series of deficiencies. [0003] The MVR evaporator uses the secondary steam generated by itself as heating steam to co...

AI Technical Summary

Problems solved by technology

However, on the one hand, the MVR evaporation system cannot be started without the initial external steam. On the other hand, due to the inability to achieve zero loss, the continuous operation of the evaporation system cannot be maintained in the case of insufficient steam.

Most of the existing related patents avoid this problem, and a few adopt the method of parallel connection between the raw steam and the outlet of the MVR steam compressor, and there are disadvantages such as mixing of steam with different pressures and inconvenient switching, which makes the MVR system work stable, continuous and Reliability, etc. are greatly affected, and even cannot run in severe cases

Images