The effects of blend ratio on combustion and pollution emission characteristics for co-combustion of Shenmu pyrolyzed semi-char (SC), i.e., residuals of the coal pyrolysis chemical processing, and Shenhua bituminous coal (SB) were investigated in a 0.35 MW pilot-scale pulverized coal-fired furnace. The gas temperature and concentrations of gaseous species (O₂, CO, CO₂, NO_x and HCN) were measured in the primary combustion zone at different blend ratios. It is found that the standoff distance of ignition changes monotonically from 132 to 384 mm with the increase in pyrolyzed semi-char blend ratio. The effects on the combustion characteristics may be neglected when the blend ratio is less than 30%. Above the 30% blend ratio, the increase in blend ratio postpones ignition in the primary stage and lowers the burnout rate. With the blend ratio increasing, NO_x emission at the furnace exit is smallest for the 30% blend ratio and highest for the 100% SC. The NO_x concentration was 425 mg/m³ at 6% O₂ and char burnout was 76.23% for the 45% blend ratio. The above results indicate that the change of standoff distance and NO_x emission were not obvious when the blend ratio of semi-char is less than 45%, and carbon burnout changed a little at all blend ratios. The goal of this study is to achieve blending combustion with a large proportion of semi-char without great changes in combustion characteristics. So, an SC blend ratio of no more than 45% can be suitable for the burning of semi-char.

在0.35 MW的中试炉中，研究了混合比对神木热解半焦（SC），煤热解化学过程的残留物和神华烟煤（SB）共燃烧的燃烧和污染排放特性的影响。规模的煤粉炉。气体温度和气体种类的浓度（O ₂，CO，CO ₂，NO _x和HCN）在主燃烧区以不同的混合比进行测量。结果发现，随着热解半焦混合比的增加，点火的距离从132mm变为384mm。当混合比小于30％时，可以忽略对燃烧特性的影响。高于30％的混合比，混合比的增加会延迟初级阶段的点火并降低燃尽率。随着混合比的增加，NO _X在炉子出口处的排放是最小的为30％的混合比和最高为100％SC。使NO _X浓度为425毫克/米³，在6％氧气₂对于45％的混合比例，炭烧尽率为76.23％。上述结果表明，当半炭的混合比小于45％时，对峙距离和NO _x排放的变化不明显，并且在所有混合比下碳燃尽都变化不大。这项研究的目的是在不改变燃烧特性的情况下实现与大部分半焦的混合燃烧。因此，不超过45％的SC混合比可适合于半木炭的燃烧。