Pretreatment cooling and waste heat utilization method for epoxy compound sewage

Abstract

The invention relates to a closed cooling and waste heat utilization process for epoxy compound sewage. Epoxy compound raw water is adjusted and pumped into a fiber filter loaded with a soft filler, the suspended solid (SS) value of water discharged by the filter is controlled in a certain range, and the water is taken as primary water of a full-automatic heat exchange unit and fed into a heat exchanger; meanwhile, the pretreated sewage or clean water is taken as secondary side inlet water; after the sewage is subjected to heat exchange by the full-automatic heat exchange unit, the temperature of the epoxy compound sewage is reduced to a range which can be tolerated by mesophilic bacteria in biochemical treatment, and secondary side sewage is heated to a water inlet temperature required by an anaerobic treatment device; and if the clean water is adopted, the produced hot water can be used as boiler make-up water, domestic hot water, heating and air conditioning hot water and the like according to the water quality of the clean water. The process has the characteristics of capability of effectively utilizing waste heat energy, no secondary pollution, continuous and stable operation, low overhaul and maintenance cost and the like.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a method for pretreatment and cooling of epoxy compound sewage and waste heat utilization. Background technique [0002] Epoxides (mainly propylene oxide and epichlorohydrin) are important propylene derivatives and are the main raw materials for the production of polyether polyols. At present, the chlorohydrin method is still used in the production of a large number of epoxy compounds in China, which has the advantages of short process, high production safety and low construction cost, but at the same time has the disadvantages of corrosion and serious pollution. [0003] The sewage produced by the production of epoxy compounds by the chlorohydrin method (hereinafter referred to as the cyclization sewage) has high temperature (60-80°C after flash evaporation and heat exchange), high pH (10-12), high salt (CaCl 2 Concentration of 3.5% to 4.0%), high suspen...

AI Technical Summary

Problems solved by technology

[0006] 1. A large amount of waste heat has not been effectively utilized, resulting in a waste of energy;

[0007] 2. The pollutants in the sewage enter the atmosphere with fine water mist or water droplets, causing secondary pollution;

[0008] Direct contact with the air produces a large amount of calcium salt precipitates to block the packing or nozzle. The cleaning and maintenance of the packing or nozzle must be done manually. The working environment is poor, the labor intensity is high, and the daily maintenance cost is high.

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