Concentration plant, concentrated water production power plant, concentration method, and operation method of concentrated water production plant

摘要

By combining a demineralizer using a membrane method and a concentrating device using an evaporation method, water containing salt such as accompanying water is stably concentrated at a low equipment cost, and separated into fresh water and salts. The accompanying water 20 is pretreated water 21 after the solid and soluble substances are removed by the pretreatment facility 3. The pretreated water 21 flows into the reverse osmosis membrane concentration equipment 4 and is separated into permeated water 22 and membrane concentrated water 24. The permeated water 22 is used as fresh water. The membrane concentrated water 24 flows into the precipitation unit 10 and an insoluble component is precipitated by mixing the alkali agent, and then flows into the storage tank 5 together with the pretreatment waste water 23 from the pretreatment device 3 to evaporate and concentrate the feed water. 25, further flows into the evaporative concentration facility 6 and is separated into condensed water 26 and evaporated concentrated water 27. The condensed water 26 is used as fresh water. The evaporated concentrated water 27 is stored in the concentrated water tank 7. The evaporative concentration facility 6 performs concentration using the steam generated by the exhaust heat recovery boiler 2 as a heat source.