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My company 2500t / d clinker production line in April 2009 ignition, officially put into operation in May. Equipped with Φ4m × 60m rotary kiln, three times the outer diameter of the duct 2350mm, diameter 1950mm, tertiary air valve less than three months can not be adjusted. When we overhaul the end of 2009 on the third damper has been transformed, has been in use for nearly two years, without any problems. 1 problems and analysis The original three times the air valve is produced by a company in Yangzhou ZDZF-G-1950 high temperature butterfly valve, the operating temperature 0 ~ 1000 ℃, the valve plate material 0ri25ni20, valve plate thickness 12mm, the valve plate casting material, from Electric actuator control valve opening. The three times in less than three months the use of the valve has emerged castable flaking wear, deformation of the valve plate stuck, broken valve plate damage and other issues, can not be completely adjusted. After our analysis, the third air valve generally open at about 75%, the valve plate in the erosion of tertiary wind horizontal huan-like, the tertiary air velocity of 20 ~ 30m / s, the role of the tertiary air valve plate will appear constantly Fierce shaking back and forth, can easily lead to loose castable drops, coupled with long-term exposure to high temperature tertiary air erosion, and I silicate higher control companies, flyer heavier material, further exacerbating the damage of the three butterfly valve. After the tertiary air valve is damaged, we temporarily take the total amount of tertiary air blown in the tertiary air duct, but the rotary kiln calcination is a dynamic process that can not adjust the rotary kiln And the decomposition of furnace wind balance, leading to the emergence of a lack of ventilation in the kiln, restore the atmosphere, the kiln ventilation is too strong, the firing zone was low temperature long flame, clinker grain is too large, yellow heart material, long circle egg, Low production of clinker, high coal consumption situation. During this period, the output of clinker was only about 2600 t / d, the strength of clinker 28 d was about 52 MPa, and the consumption of standard coal per ton of clinker reached 123 kg, which caused serious economic losses to the enterprise and seriously threatened the safe operation of the production. 2 technical innovation program After a detailed study and comparison, with reference to other manufacturers experience in technological transformation, we decided to transform the tertiary air valve, from the original butterfly valve into a gate valve, using Zhejiang Changxing Guosheng Refractory Factory production Jiusheng brand tertiary air valve plate, The main features of the valve plate is the valve body mold and heat-resistant steel and refractory castable tightly wrapped to form a whole, using corundum - mullite stone high-strength castable castable pouring, and after pre-baked. Valve plate width 1800mm, thickness 200mm, length 2600mm. As shown in Fig. 1, the upper end of the valve plate has two ring-shaped ears, the steel wire rope is connected to the hand chain hoist on the hanger through the valve plate ear plate, the valve plate is lifted by the hand chain hoist above and the chain hoist is hung on the crane Rack beam, with the hand chain hoist to adjust the insertion depth of the valve plate (ie: the three ventilation area). The valve plate is inserted into the tertiary air duct. Both sides of the air duct are covered with brick to form a box shape. The left and right sides of the valve plate are fixed in a plane. The valve plate exposed outside the tertiary air duct is covered by an iron hood to prevent air leakage and protect the valve plate Not subject to rain erosion. Figure 1 after the renovation of the tertiary air valve 3 application results Three air valve renovation has been two years, stopping the kiln inspection check the third air valve and found that in addition to some damage to the brick, the valve plate remains intact, the conservative estimate can also use two year. And after the third air valve reform, the rotary kiln and calciner use the wind to be balanced and adjustable, the kiln condition remains basically stable, the long ring can be quickly disposed of after the basic to eliminate the egg, crust phenomenon is also greatly reduced, the kiln Elimination of the reduction atmosphere, the problem of low temperature long flame can be solved. Clinker particles are homogeneous, the basic elimination of yellow heart material, clinker production increased significantly. Clinker production is now basically stable at 2900t / d, clinker 28d strength of 58MPa, tons of standard coal consumption of clinker 116kg or so, for the production line and reduce costs bring great benefits. 4 benefit comparison Before the transformation of the butterfly valve price of 32,000 yuan, the use of three months, the production of clinker 190,000 t, the loss of three tons of clinker per thousand tons of air valve costs up to 1684 yuan. Renovation of the valve plate into a total of less than 100,000 yuan (iron shield, hanger, etc., excluding working hours fee), is expected to use four years, annual production of 750,000 t clinker, the loss cost per 10,000 tons of clinker only 333 yuan, 5 times more than the price, only three times a year valve loss of one to reduce the cost of 10 million yuan.