High-concentration salty wastewater MVR (mechanical vapor recompression) evaporative crystallization treatment system

Abstract

A high-concentration salty wastewater MVR (mechanical vapor recompression) evaporative crystallization treatment system comprises a raw material storage tank, a feed pump, a plate heat exchanger, a DTB evaporation crystallizer heating chamber, a DTB evaporation crystallizer, a vacuum evaporation crystallizer heating chamber, a vacuum evaporation crystallizer, a first hydraulic cyclone, a sodium sulfate slurry barrel, a double-stage pusher centrifuge, a vibration fluidized-bed dryer, a first mother liquor storage tank, a first mother liquor pump and a mother liquor circulating pump. The high-concentration salty wastewater MVR evaporative crystallization treatment system is characterized in that the raw material storage tank is sequentially connected with the feed pump, the plate heat exchanger, the DTB evaporation crystallizer heating chamber, the DTB evaporation crystallizer and the vacuum evaporation crystallizer heating chamber. The system is low in comprehensive energy consumption, finally obtained anhydrous sodium sulfate quality meets the requirements of GB / T6009-2014 industrial anhydrous sodium sulfate class-II top quality goods, sodium sulfate content is higher than or equal to 98%, and industrial sodium sulfate meets solarized sodium sulfate secondary standard requirements of national industrial sodium sulfate standards (GBT5462-2003).

Description

technical field [0001] The invention relates to an evaporation crystallization system, in particular to an MVR evaporation crystallization treatment system for high-concentration saline wastewater. Background technique [0002] The production of Glauber's salt ore in well mines in China is about 30 million tons, accounting for 50% of the national salt production. National Glauber's salt-type salt mines are distributed in Hubei, Hunan, Jiangxi, Yunnan, Anhui, Jiangsu, Shandong, Shaanxi and other provinces. Most of them are based on vacuum evaporation salt production, and the production capacity of a single set of equipment is 600,000 to 1,000,000 tons per year. The equipment used mainly includes falling film evaporation crystallizer, FC type evaporation crystallizer, Oslo evaporation crystallizer, etc.; but these equipment have the following defects when dealing with high-concentration saline wastewater: [0003] 1. The falling film evaporation crystallizer is very easy to ...

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Problems solved by technology

[0003] 1. The falling film evaporation crystallizer is very easy to cause scaling on the dry wall. It needs to be cleaned frequently, and users with high labor intensity are not welcome;

[0004] 2. FC type evaporation crystallizer, the crystal size is not large, about 0.15-0.3mm, difficult to dehydrate, agglomeration seriously affects the quality of the product, the heating tube is not easy to clean and the tube wall is easy to wear;

[0005] 3. The Oslo evaporative crystallizer has a complex structure, large volume, high energy consumption, high corrosion, and prominent pipe plugging and scarring

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