My company 2500 t/d clinker production line in April 2009 the ignition, formally put into production in May. Equipped with 4 m by 60 m Φ rotary kiln, three duct diameter is 2350 mm, inner diameter of 1950 mm, three air valve use less than three months will not be able to adjust. When we at the end of 2009 overhaul of three air valve, has been used in the past two years time, did not appear a little problem. 1 problems and analysis of the original three air valve is made up of yangzhou ZDZF - a company production G - 1950 high temperature butterfly valve, temperature 0 ~ 1000 ℃, 0 ri25ni20 the valve material, valve plate thickness is 12 mm, castable on Industrial Valves plate, controlled by the electric actuator adjusting valve opening. The three air valve in the use of less than three months successively appeared castable spalling wear, deformation stuck valve plate, valve plate fracture damage, etc. , until completely unable to adjust. After we analysis, three air valve opening is around 75% commonly, Industrial Valves plate in the three times of wind erosion and transverse huan, three times the wind speed up to 20 ~ 30 m/s, three times in the valve plate under the action of wind will appear constantly fierce swaying back and forth, vulnerable to castable is loose, and washed by the trend of high temperature three times for a long time, and my company rate control is higher, silicate sand fly is heavier, exacerbated by three times the wind butterfly valve damage. After three air valve damage, we take the pile of bricks in the three duct to control three times the amount of wind, but the calcining rotary kiln is a dynamic process, in the event of a kiln of volatility, crust after the ring can't adjust the rotary kiln calciner and the balance of the wind, leading to insufficient ventilation has appeared the stove, ventilation had strong reducing atmosphere, stove, clinker calcining zone in low temperature gas flame, slants big, yellow heart knot grain material, long circle knot eggs, low clinker production and high coal consumption. During this period, the output of clinker is only about 2600 t/d, 28 d clinker strength about 52 mpa, clinker tons of standard coal consumption of 123 kg, cause serious economic losses to the enterprise, a serious threat to the safe running of the production. 2 technical improvement scheme, after detailed research and comparison, the reference other manufacturers technical experience, we have decided to three times the wind valve, transformed from the original butterfly valve gate, the zhejiang guo sheng long refractory plant production long sheng card three air valve plate, the main characteristics of the valve plate is body die and heat resistant steel and refractory castable close bond, form a whole, the corundum - Mullite stone high strength wear resistant castables casting, and after baking. plate width of 1800 mm, 200 mm thick, 2600 mm long. As shown in figure 1: have two annular upper disc ears, wire rope through the valve plate ear is connected with the chain on the hanger, above the valve plate by hand chain hoist, chain hanging on the hanger beam, hand chain hoist adjustment valve plate insertion depth ( I. e. , three times the wind ventilation area) 。 Duct valve plate into three times in both parties have to protect brick into box shape left and right sides of the valve plate fixed on a plane, dew outside the three duct of valve plate by an iron cover to cover, to prevent air leakage and protection valve plate is not affected by rain. Figure 1 after transforming the three air valve 3 application effects of three air valve reconstruction has been two years, stop kiln maintenance check three air valve, found that in addition to protect brick damage, the valve plate to keep in good condition, a conservative estimate can also be used for two years. And three times after transforming wind valve, and rotary kiln calciner and using the wind to balance and adjustable, conditions remain basically stable, long laps later can quickly get rid of, basic and put an end to settlement of egg crust phenomenon also reduce greatly, reducing atmosphere in furnace to eliminate, low-temperature long-flame to solve problems. Clinker junction are neat, basically eliminated yellow heart, clinker production quality has improved significantly. Now basic stability in 2900 t/d clinker output, clinker strength of 28 d of 58 mpa, clinker tons of standard coal consumption in 116 kg, a lot of benefits for production along the line and cost reduction. Price for 3 4 benefits before contrast transform butterfly valve. 20000 yuan, the use of three months, clinker production of 190000 t, the loss of ten thousand tons of clinker each three air valve cost of 1684 yuan. Transforming valve plate amounted to less than 100000 yuan investment ( Iron cover, hanger, etc. , excluding partners) , is expected to use four years, annual production of 750000 t clinker, the loss of ten thousand tons of clinker each costs only 333 yuan, the price increase for more than five times, only three times a year an air valve loss will reduce the cost of more than 100000 yuan.
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