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Stepwise Reuse of Water for Quenching in Huangling Coal Chemical Company Author/Source: Shaanxi Shanjiao Chemical Co., Ltd. Date: 2020-09-17 Clicks: 44 On September 15, under the coordination of the dispatch team, staff from the chemical production and coking departments of Huangling Coal Chemical Company opened the valves connecting the recycled water to Tank No. 1 for quenching; as a result, recycled water was used as supplementary water for quenching, enabling stepwise utilization of water resources. The water used for quenching coke in this company is supplied by biological wastewater pumps. However, the No. 1 quenching tank in the coking workshop is located far away from the wastewater pumps in the chemical production workshop; as a result, during periods of high production load, the low pressure in the wastewater pipelines makes it impossible to meet the requirements for quenching coke. Therefore, fresh process water or fire-fighting water must be used to ensure normal operations. Approximately 200 cubic meters of production water or fire-fighting water need to be supplied daily for regulation purposes, and these issues have become challenges that the technical staff in the Production Operations Department are working to address. By broadening their thinking and conducting further research as well as optimization efforts, the technical staff discovered that the return water parameters of the circulating water in the chemical production workshop fully meet all the quality requirements for water used in coke quenching. Moreover, directing the high-temperature return water to the coke quenching tank helps reduce the cooling load on the circulating water system in chemical production. By adding approximately 200 meters of DN100 pipeline through the return water drainage pipe of the final cooler in the chemical production workshop, it leads to the coking quench tank ； Adding pipes to connect the return water from the final cooling unit’s circulation system to Tank 1 for coke quenching helps address the water shortage in Tank 1 of the coking workshop, eliminates the need for additional fire-fighting water, and increases the pressure in the company’s fire-fighting water system. After the renovation, it not only increases the volume of circulating water replacement in the chemical production workshop by about 200 m3/day, thereby improving the quality parameters of the circulating water, but also reduces the electricity consumption of the wastewater recirculation pumps, saving approximately 30 KW of electricity per day. According to the head of the Production and Operations Department, the effective advancement of energy conservation and emission reduction efforts relies on the incremental improvements that result from local optimizations at the production site. Going forward, they will make full use of the production scheduling system, and by taking into account the layout of equipment in the plant, they will continue to optimize processes in order to promote the systematic utilization of water resources within the plant, ensuring that daily tasks are carried out thoroughly and effectively.