MVR evaporation system employing two-effect parallel flow method

Abstract

An MVR technology and a multi-effect evaporation technology belong to energy-saving technologies in the field of evaporation. The MVR technology is more obvious in energy-saving advantage, but core equipment compressor is relatively high in cost; an MVR system appears in a single-effect form in general and the investment cost of the compressor is almost half of all cost. The MVR technology is reasonably combined with a traditional multi-effect evaporation process employing a parallel flow method, and is optimized and integrated to form an MVR evaporation system employing a two-effect parallel flow method. The equipment investment can be reduced, the improvement of the efficiency of the whole evaporation system is facilitated, and the MVR evaporation system has the meaning of further energy conservation and emission reduction. The main measures of the system are as follows: secondary steam which is evaporated and separated from the second effect is compressed through a lobed rotor compressor to improve enthalpy and then used as sole first effect heating steam, meanwhile, the secondary steam which is evaporated and from the first effect is taken as a heat source of second effect heating equipment, and a little of live steam can be adopted to assist as a second effect heat source.

Description

technical field [0001] The invention relates to a mechanical vapor recompression system (abbreviated as MVR), which is mainly used as an energy-saving technology in the evaporation industry. Background technique [0002] Both MVR technology and multi-effect evaporation technology belong to the energy-saving technology in the field of evaporation. The former has more obvious energy-saving advantages, but the cost of the core equipment compressor is relatively expensive. MVR systems usually come only as a single-effect form, where the investment cost of the compressor is almost half that. Compared with the MVR technology, the traditional multi-effect evaporation process has a large gap in energy saving advantages, and at the same time, the cost performance is getting lower and lower with the increase of the number of effects, usually in the form of three effects. The advantage of multi-effect evaporation technology is that the process is mature and has cost advantages. The p...

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Problems solved by technology

[0002] Both MVR technology and multi-effect evaporation technology belong to the energy-saving technology in the field of evaporation. The former has more obvious energy-saving advantages, but the cost of the core equipment compressor is relatively expensive.

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