Thermal oil heater is an important equipment to provide heat energy for the process flow of hot melt solidification, high temperature steaming, drying, finalization, etc. in the printing and dyeing industry. A printing and dyeing company in Nigeria specializes in the production of all cotton wax printed cloth, and its products are also sold to other countries and regions in Africa. It is one of the largest local production bases of all free wax printed cloth. The printing and dyeing company has previously purchased 14 million kcal YLW series coal-fired thermal oil heater from Sitong boiler, but as an environmental friendly printing and dyeing enterprise, the printing and dyeing company decided to introduce a gas-fired thermal oil boiler in response to the policy of energy conservation and environmental protection. Based on the previous cooperation experience, the printing and dyeing company was very confident about the quality and safety of the thermal oil boiler of Sitong boiler, so it chose to cooperate with Sitong boiler again. This time, Sitong boiler recommended a 3 million kcal gas-fired thermal oil heater for them. This boiler adopts closed cycle heating, with small heat loss, remarkable energy saving effect and good environmental protection effect. It is equipped with low nitrogen combustion device, which can realize ultra-low NOx emission.