神府烟煤焦与城市固体废弃物水热炭焦共气化反应特性的实验研究

Experimental study on co-gasification reactivity of Shenfu bituminous coal char and MSW-based hydrochar

基于常压热重分析仪(TG)开展了神府烟煤焦(SF char)、水热炭焦(HTC char)及其混合物等温CO_2气化实验以研究气化温度(800-950℃)、掺混比(3∶1、1∶1、1∶3)对共气化特性的影响,并探讨了气化反应活化能及其影响因素。结果表明,HTC因其较大的比表面积和较多的灰分而具有较强的气化活性。低HTC掺混比的混合物气化活性对温度变化敏感。低温下混合物的气化活性受HTC掺混影响显著。反应活化能随着反应转化率的增大而逐渐增大并趋于稳定。进一步研究表明,混合物的活化能与其掺混比以及活性矿物(K+Na)/Ca的物质的量比均存在近似线性关系。

The influences of gasification temperature（ 800-950 ℃） and blending ratio（ 3 ∶1,1 ∶1,1 ∶3） on the isothermal CO_2 co-gasification reactivities of Shenfu bituminous coal char（ SF char） and HTC char were investigated using an atmospheric thermogravimetric analyzer（ TGA）. Moreover,the activation energy of char gasification and its influence factors were explored. The results show that the greater surface area and the higher ash content are the main reasons for the high gasification reactivity of HTC char. The reactivities of mixtures with low HTC char proportion are more sensitive to temperature at low temperature range. The activation energy increases with the increase of carbon conversion,and the activation energy correlates well with the blending ratio and the molar ratio of active（ K＋Na）/Ca in the char.