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日本钢管公司发明了一种利用中温余热的烧结工艺,其特点是把烧结机中部、烧结矿冷却机后半部以及烧结机废气余热回收设备产生的中温废气,供给烧结机点火器前烧结料、点火器保温以及烧结机前部使用。温度为150—250℃的中温废气,除了使点火器前烧结料预热和使点火器保温外,还能使烧结层湿润带中准粒子所含Ca(OH)_2与废气中CO_2发生反应:Ca(OH)_2+CO_2→CaCO_3+H_2O,炭酸化反应的结果使由矿粉,焦粉和石灰粉组成的准粒子得到进一步固化,烧结料层透气性明显改善。工艺流程是:1.台车上的烧结料烧结反应基本完成后,通过这部分烧结层的废气温度高,首先回收高温余热,使高温废气通过余热锅炉,以蒸汽提供发电机发电。通过余热锅炉后的废气温度为150—250℃,然后利用引风机和管道把这部
Nippon Steel Pipe Co., Ltd. has invented a sintering process using medium-temperature residual heat, which is characterized by supplying the middle-temperature exhaust gas generated in the middle of the sintering machine, the second half of the sintering ore cooler and the waste heat recovery equipment of the sintering machine to the sinter pre-sinter sintering material, Igniter insulation and sintering machine front use. Temperature of 150-250 ℃ in the temperature exhaust gas, in addition to pre-igniter sinter and preheat the igniter, but also make the sintered layer moist particles in the quasiparticle Ca (OH) _2 react with CO_2 in the exhaust: Ca (OH) _2 + CO_2 → CaCO_3 + H_2O. The results of the carbonation reaction make the quasi-particles composed of ore powder, coke powder and lime powder further solidified, and the permeability of the sintering material layer is obviously improved. The technological process is as follows: 1. After the sintering reaction of the sintering material on the trolley is basically completed, the exhaust gas of this part of the sintering layer is high in temperature. The high temperature waste heat is firstly recovered and the high temperature exhaust gas is passed through the waste heat boiler to supply the generator with steam to generate electricity. After the waste heat boiler exhaust temperature of 150-250 ℃, and then use the induced draft fan and pipe to this