Xinjiang coal cleaning refining co., LTD in hami district, our county 4, Mao Hu town construction of 30 million tons/year coal classification quality comprehensive utilization project, a total investment of 6.75 billion yuan, the crushed coal pressurized gasification, methane, cold separation, low temperature methanol purification, methanol synthesis and dimethyl ether synthesis technology, the main products include coal gas (LNG) 490 million cubic, 1.2 million tons of methanol, dimethyl ether 800000 tons, 210000 tons of other by-products. This project circulating water system is divided into inner loop and outer loop system two parts, the inner loop system according to the water supply device is divided into three circulating water system, circulating water system respectively hydrogen plant hydrogenation plant circulating water system and the coal dry distillation plant circulating water system. Cold well for China grand 4 Mao Hu project supply is to meet within 38000 m after/h of traffic circulation cooling device, the design of 0 ℃ water water-saving index, the main characteristics of the project "energy saving, water saving, antifreeze, protect themselves from blowing sand, facilitate adjustment", cooling tower of host control mode can adapt to the requirements of the unattended. Project in September 2014 consign is used, the smooth completion of commissioning and operation, meet and exceed the expected goals, and become the first domestic large circulating cooling water system of water-saving design, greatly reduces the loss of cooling water, for the sustainable development of the project laid the foundation of important water resources.