As one piece of important equipment for the water purification material production line, the thermal fluid heater plays the role of providing heat energy in the production process of the water purification agent. Chongqing Lanjie Guangshun Water Purification Materials Co., Ltd. was established in 2009, mainly producing and selling industrial water chemical treatment agents and urban sewage chemical treatment agents. With the continuous expansion of production scale, the company urgently needed to upgrade the boiler equipment on the existing production line. Meanwhile, in the face of increasingly severe environmental pressures, the company decided to purchase environmentally friendly thermal fluid heater which uses clean energy natural gas as fuel. In the market research process, the project manager of the company found that the It thermal fluid heater had outstanding advantages in terms of product quality, performance and environmental protection effects, then the company decided to purchase a set of 7MW horizontal gas-fired thermal fluid heater from It. This kind of heater adopts three pass circular tube design for sufficient heating surface, and the waste heat boiler and energy-saving device disposed at the tail of the heater can greatly reduce the loss of thermal energy, the thermal efficiency can be as high as 95% or more. Advanced low NOx burner can achieve NOx emissions below 30mg/Nm³. And the operation of the thermal fluid heater can realize full automatic control, and can automatically adjust the combustion, high tank level, outlet temperature and flow to ensure the safe operation.