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Dolomite with a rotary kiln burning options

Taking the number of 1.1 and 1.15, respectively, at this time, the theoretical combustion temperature and combustion temperature are slightly higher than the actual values in the table can be seen from Table l,[link widoczny dla zalogowanych], when the use of producer gas (cold gas) as fuel, only in the gas The heating value of 6279kJ / N only meet the above requirements of calcined dolomite, in general, producer gas combustion temperature is lower than the actual requirements of dolomite calcination temperature (whichever is the lower limit of the calcination temperature 1150 ℃),[link widoczny dla zalogowanych], which requires extension of the material in the kiln and reduce the residence time under the quantity, so the kiln production capacity is low, product quality is difficult to meet the design requirements. In order to achieve the required calcination temperature of dolomite can be used producer gas and heavy oil, coal and other high calorific value fuel mix, gas furnace if the heat is 5233/Nm3, coal heat value 251161d/kg,[link widoczny dla zalogowanych], its the ratio of co-firing with coal gas 1Nm3 0.19kg. * 46 light metal № 5 1997 when the hot gas for direct use of rotary kiln fuel, 1Nm. Gas heat can be more physical with people 375kj (according to the point of use temperature is 300 ℃, 20 ℃ cold gas temperature is calculated), you can save about 7% of gas consumption. When the gas heat value 5442kl / N above, the combustion temperature can meet the requirements of calcined dolomite. When the low calorific value gas, the gas flame short (2 ~ 4m), the kiln production capacity is low. Need to increase the gas by thermal gas transmission pipeline diameter, increasing pipe insulation facilities, the increased investment in infrastructure, in the course need to be cleaned regularly, increasing the maintenance workload, which is only applicable to small scale construction , where a shorter pipeline. When using blast furnace gas (by-product of iron works) as fuel, because of gas heating value is too low, can not be directly used for calcined dolomite. When the blast furnace gas heating value 4186kl / or more, gas and combustion air are preheated to 350 \In areas where conditions permit, hence the cheap furnace gas and heavy oil, coke oven gas, natural gas heat value of fuel firing, it is an ideal solution. When using semi-water gas or water gas heat value greater than half the fuel, its combustion temperature rotary kiln can meet the requirements of dolomite. To prevent overheating, the right amount of cold air can be mixed. When using coal as fuel, because of some ash into the product, the quality of calcined dolomite. If additional screening device to remove coal ash, the loss of Calcined Dolomite large amount (based on high temperature strength of dolomite vary, usually about l0%). High calorific value and therefore should be used, less coal for pulverized coal ash. The use of a low-ash petroleum coke powder, to avoid contamination of product quality ash. 22 cost of fuel used calcined dolomite fuel prices in different regions,[link widoczny dla zalogowanych], Table 2 lists the actual production of calcined dolomite in the common price of fuel at different fuel costs per unit of product. From Table 2, when using producer gas as a fuel,[link widoczny dla zalogowanych], due to significant differences between the regions coal prices, fuel cost per unit of product is also a great difference, in general is relatively high. Easy because the source of coal, which in the actual production is still widely used. Table 2 calcined dolomite used the low calorific value fuel unit costs of fuel costs were single elimination kaoliang UNm3 (gas) t has been calcined kJ (solid, Tibetan), or calcined calcined white element t from the occurrence of jealous king stupid gas heavy oil gas weed Note: gland coal, but according to the amount of heat per ton of calcined white 10465kJ calculation when using coal as fuel. By screening leaving 10% of total depletion of white calcined. The white heat consumption per ton of calcined corresponding increase of 10%. Heavy oil as fuel, heavy oil sources if there is no local difficulties in the economy is quite appropriate. Using coal as fuel, fuel cost per unit of product is the lowest. In order to ensure product quality, additional screening device calcined white. If supported by some of the coal producer gas as fuel, when used high calorific value, low ash coal, the calcined white can also be removed from the screening device. 3 Conclusion Pidgeon a rotary kiln fuel with dolomite to be selected according to local supply conditions. b wide variety of sources of coal, which producer gas is widely used as a rotary kiln fuel dolomite. When using cold gas, it is best with the coal, heavy oil and other high calorific value fuel mix. On plant size 1000t / a or less magnesium plant, may also be used hot gas. C. Rotary kiln with coal as fuel, lower fuel costs per unit of product. However, suitably high calorific value, low ash coal and Duan white screening should be set device. 4 References [1] Di, Yao compiled at Silicon Thermal Theory and Practice of magnesium [2] re-colored gold furnace design reference afraid of Metallurgical Industry Press, lg787 [3] Central Institute of Mining and Metallurgy Programme Design and calculation of non-ferrous metallurgical furnace. Received date :1996-11 A Ol

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