Cobaltous sulfate solution evaporation system and process thereof

Abstract

The invention discloses a cobaltous sulfate solution evaporation system and a process thereof. The evaporation system comprises an evaporation unit, a vacuum unit, a preheating unit and a connecting pipeline, wherein the evaporation unit comprises a separator, a steam compression machine, evaporators and a forced circulation pump; a secondary steam outlet of the separator is directly communicatedwith the evaporators through pipelines and is indirectly communicated with the evaporators through the steam compression machine; the two groups of evaporators are in parallel and are communicated through the circulation pump; the vacuum unit comprises a two-stage condenser, a two-stage gas-liquid separator, a vacuum pump and a condensate tank; the preheating unit comprises four preheaters; a medium heat inlet and a second-level condensation liquid cooling medium outlet of a first-level preheater are connected with a heat medium outlet of a second-level preheater; a medium inlet of the second-level preheater is connected with a condensation liquid tank through a condensation liquid pump; a heat medium inlet of a third-level preheater is connected with non-condensable gas outlets of the evaporators. Compared with an existing evaporation process, the process utilizing the system for evaporating a cobaltous sulfate solution has the advantages of high heat recovery rate, high continuity and low investment cost.

Description

technical field [0001] The invention belongs to the technical field of evaporation, in particular to a mechanical vapor recompression evaporation system for cobalt sulfate solution. Background technique [0002] In the traditional cobalt sulfate evaporation and crystallization process, the evaporation process is mostly carried out by single-effect or multi-effect evaporation. The secondary steam of single-effect evaporation or the last stage steam of multi-effect evaporation is directly transferred to the cooling water outside the system by a vacuum pump, and at the same time It is necessary to build a cooling water circulation cooling system, and it needs to consume steam to maintain the evaporation temperature. The consumption of steam (0.8MPa) is about 0.8~1.2 tons / water. [0003] CN201610658077.7 discloses a device system for high-efficiency concentration and continuous crystallization of cobalt sulfate: applying MVR technology to the evaporation of cobalt sulfate soluti...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned evaporation system, and provide a set of mechanical vapor recompression e

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