球团竖炉内适宜焙烧风量的研究

研究了球团竖炉大型化和高效化的关键问题之一炉内适宜焙烧风量问题,即竖炉在某个产量下所需的焙烧风量.结合气固传热方程和热平衡方程,求得了竖炉在某个产量下所需的焙烧风量,并运用填料床阻力特性规律研究了如何能够将充足的焙烧风量鼓入球团料层这一问题.研究表明:当以磁铁矿为主要原料时,竖炉适宜的气固水当量比为0.71~0.72,当考虑焙烧风分布均匀性时,适宜的气固水当量比为0.75~0.80;扩大喷火口、优化燃烧室结构、侧引风重力除尘和改进传统的调节方式是保证炉内适宜气固水当量比的主要手段.

Study on Desirable Flowrate of Roasting Gas in Pelletizing Shaft Furnace

Studies thermodynamically the key problems of the high capacity/efficiency pelletizing shaft furnace (PSF), i.e., flowrate of roasting gas in PSF as desired for a constant output. The desirable gas-solid water equivalent ratio was defined by the equations of gas-particle heat exchange and thermal equilibrium, then the problem how the desirable roasting gas blasts into the packed beds was studied. Some conclusions were drawn as follows. For the PSF whose main raw material is magnetite, the desirable water equivalent ratio is about 0.71-0.72, and the desirable water equivalent ratio should be about 0.75-0.80 if considering the uniformity of roasting gas in PSF. In addition, some measures should be taken to ensure the desirable water equivalent ratio in PSF, such as enlarging the inlets of roasting gas, optimizing the structure of combustion chambers, removing dust by sidewise induced-draft and gravity and improving conventional adjustment of PSF.