Process for solving problem of high evaporation boiling point of ammonia chloride by using MVR

Abstract

The invention discloses a process for solving the problem of high evaporation boiling point of ammonia chloride by using MVR. The method comprises the following steps: preheating ammonium chloride wastewater, then feeding into a crystallization separator through an N1 inlet, wherein N2 is connected with a heater through a pipeline and a circulating pump, circularly feeding the heated ammonium chloride wastewater into a crystallization separator through an N3 inlet, carrying out cyclic heating evaporation, feeding an ammonium chloride concentrated solution into a cooling crystallization kettlethrough a discharge pump, and keeping the temperature in the crystallization kettle below 45 DEG C so that ammonium chloride crystals are produced. The system is stable in operation, high in automation degree and low in energy consumption, the evaporation temperature of the ammonium chloride is reduced, the ammonium chloride is prevented from being evaporated and decomposed at a high temperature,and the problem that ammonia chloride is easy to decompose due to the fact that the MVR evaporation boiling point is high is effectively solved.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a process for solving the problem of high boiling point of ammonium chloride using MVR evaporation. Background technique [0002] At present, when ammonium chloride wastewater is used to recover ammonium chloride, the evaporation boiling point temperature is generally 100°C--400°C. Ammonium chloride is easily decomposed at high temperature to form ammonia and hydrochloric acid, and the evaporation temperature of MVR is relatively high. Therefore, when using MVR to evaporate chlorine When ammonium chloride is recovered from ammonium chloride wastewater, ammonium chloride is easily decomposed, which greatly reduces the recovery rate of ammonium chloride in wastewater, and the content of ammonia nitrogen in distilled water is relatively high. MVR is a mechanical vapor recompression technology, which uses the secondary steam and its energy generated by the evaporation system itse...

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Problems solved by technology

[0002] At present, when ammonium chloride wastewater is used to recover ammonium chloride, the evaporation boiling point temperature is generally 100°C--400°C. Ammonium chloride is easily decomposed at high temperature to form ammonia and hydrochloric acid, and the evaporation temperature of MVR is relatively high. Therefore, when using MVR to evaporate chlorine When ammonium chloride is recovered from ammonium chloride wastewater, it is easy to cause ammonium chloride to decompose, which greatly reduces the recovery rate of ammonium chloride in wastewater, and the content of ammonia nitrogen in distilled water is high

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