Abstract: Origianally the TW3M coal gas generating furnace for heating of steel tubes as being heat treated originally had a number of problems, including missing the designed capacity, existence of gas-solid-phase blind area, frequent damage of the equipment, high coal and water consumptions, management discontinuity and incompletely implementation of the management regulations, etc.. Accordingly, Jiangsu Chengde Steel Tube Co., Ltd. has taken a serial of energy-saving/consumption-reducing-aimed technical modification measures and further strengthened the production management, having solved all the said problems. As a result, the coal gas capacity has been increased by 46.7%, and the coal gas quality is also significantly improved, and the overhaul interval is prolonged from the original 3~6 months to 2~3 years, and the production cost is tremendously reduced.