High temperature shaft kiln is a kind of device used to calcine lump or pellet materials, which is mainly used for sintering limestone, dolomite, magnesite and tabular corundum. The kiln body is generally cylindrical. The materials are added from the upper part of the kiln body and discharged from the lower part of the kiln body after calcination. The high-temperature flue gas washes the materials from bottom to top and forms counter current combustion. The technological innovation of high temperature shaft kiln system includes: the design and development of working layer refractory material, which can adapt to the extreme calcination temperature of high-temperature shaft kiln and realize long-life operation; the development and application of high-efficiency water-cooled spray gun can improve the calcination efficiency and increase the service life of the spray gun; according to the characteristics of materials, the design of calcination zone temperature and the primary and secondary air temperature are targeted By adjusting the ratio, the nodulation of kiln is improved obviously; The gas air premixing technology can optimize the thermal field distribution and improve the combustion efficiency while ensuring the safety; it is applied to the design and development of the high temperature shaft kiln automation system to realize the one key start-up and shutdown and unattended operation of the high-temperature shaft kiln.
Through the application of the above new technology, the fully automatic control level has been realized. The heat consumption is about 360kcal / kg, which is 60% of the heat consumption of ordinary high-temperature shaft kiln and 50% of that of mechanized shaft kiln.
Main technical parameters：
|3||Thermal principle of calcination||counter-flow|
|5||Particle size of raw materials,mm||12--30|
|6||Fuel type||Heavy oil, natural gas, gas, coal|
|8||Annual working days,t||>330|
|9||Ineffective heat emission,kJ/kg||502|
Investment estimate of high temperature shaft kiln project, preliminary design and construction drawing design of high temperature kiln, supply and complete set of equipment and instruments, domestic and international procurement, construction and installation supervision, kiln commissioning and personnel training, technical innovation and technical consultation of existing high temperature kiln.
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