快速热解褐煤焦的低温氮吸附等温线形态分析

利用热力工况与实际煤粉锅炉相似的管式沉降炉，在快速热解条件下制备了不同粒度及不同热解时间的元宝山褐煤煤焦试样，采用美国Micromeritics公司ASAP2020自动吸附仪测定各煤焦试样的低温氮吸附等温线，对吸附等温线形态的分析表明，不同粒度及不同热解时间的煤焦，其吸附等温线都是典型的Ⅱ型吸附等温线，说明其具有较连续的完整的孔系统，孔径范围是从小至分子级孔(孔径约0.86 nm)，大至无上限孔(相对而言).由吸附回线分析，各煤焦试样的孔隙可能是由大量一端封闭的盲孔（一端封闭的圆形孔、一端封闭的平行板状孔、一端封闭的楔形孔或一端封闭的锥形孔）以及部分的裂缝形孔组成.

he configuration analysis of the adsorption isotherm of nitrogen in low temperature with the lignite char produced under fast pyrolysis

Char samples prepared using Yuanbaoshan lignite，different in particle size and pyrolysis time，were analyzed with Micromeritics ASAP2020 auto adsorption analyzer. All these samples were made under the condition of fast pyrolysis in the drop tube furnace apparatus，which provides the similar situation to the real pulverized coal fired boilers. The analysis of adsorption isotherms shows that the isotherms of char samples，different in particle size and pyrolysis time，are all type Ⅱ with hysteresis loops； and the result indicates that those samples possess continuous and integral system of pores，ranging from molecular scalar (about 0.86 nm in diameter) to infinite large scalar (contrast to normal situations). Based on the analysis of hysteresis loops，pores of samples are consist of large quantity of blind holes (circular blind ones，planar blind ones，wedge blind ones or taper blind ones)，and some split ones.