The properties of activated coke (AC) for sintering flue gas purification greatly affect the efficiency of desulfurization and denitration, but they gradually change during cycles. The change in properties of coal-based AC during cycles was studied to clarify the change law and AC optimization index. The AC oxygen content rapidly increases from 13.49 to 17.87 wt.% in the early cycles to form phenol, which promotes the denitration rate from 55.63% to 78.20%. The denitration performance slowly increases in subsequent cycles because of the generation of quinone from AC slow oxidation. However, the oxygen-containing groups are not conducive to adsorption capacity of AC for NO. The adsorbed NO species which can be replaced by SO₂ is the main NO species on AC, and its amount decreases with the decrease in C=C content of AC. The AC chemical loss leads to the opening of closed pores, expansion of original pores and formation of new pores, causing micropore volume to increase from 0.085% to 0.152%, compressive strength to decrease from 472 to 336 N, and abrasive resistance to decrease from 97.87% to 94.16% during cycles. The low oxygen content and high micropore volume are favorable to the initial desulfurization performance, and the former is more decisive. After a while, the desulfurization rate is linearly positively correlated with the micropore volume regardless of the chemistry. 4-h desulfurization rate increased from 69.03% to 85.91% during 25 cycles due to the increasing micropore volume. The AC properties change in cycles will greatly affect the desulfurization and denitration rate in the height direction of the flue gas purification system. Selecting the coal-based AC with moderate micropore volume, easy oxidation surface and less original oxygen-containing groups facilitates the better purification efficiency at lower cost for sintering plants.

用于烧结烟气净化的活性炭（AC）的性能极大地影响了脱硫和脱硝的效率，但它们在循环过程中会逐渐变化。研究了煤基交流电在循环过程中的性能变化，以阐明变化规律和交流优化指标。AC氧含量在早期循环中从13.49 wt。％迅速增加到形成苯酚，从而将脱硝率从55.63％提高到78.20％。由于AC缓慢氧化生成醌，因此脱硝性能在随后的循环中缓慢增加。然而，含氧基团不利于AC对NO的吸附能力。可以被SO ₂代替的吸附NO种类是AC中主要的NO种类，其含量随AC中C = C含量的降低而降低。交流化学损失导致封闭的孔张开，原始孔的膨胀和新孔的形成，从而导致微孔体积从0.085％增加到0.152％，抗压强度从472 N降低到336 N，耐磨性从周期中为97.87％至94.16％。低氧含量和高微孔体积有利于初始脱硫性能，前者更具决定性。一段时间后，无论化学性质如何，脱硫速率均与微孔体积呈线性正相关。由于微孔体积的增加，在25个循环中4小时脱硫率从69.03％增加到85.91％。循环中AC特性的变化将极大地影响烟气净化系统高度方向上的脱硫和脱硝率。选择具有中等微孔体积，易于氧化的表面和较少的原始含氧基团的煤基AC有助于烧结厂以较低的成本获得更好的净化效率。