This represent a significant barrier for further development and commercializing of the technology . as one important item in this research , the investigation on the technology of gas catalytic reconstruction was paid close attention in our laboratory 由于国内在催化裂解方面起步较晚，主要介绍国外几家能源机构对生物质焦油的催化裂解的试验研究以及工程应用技术。
Presently the crop stalks - based biomass gasification and centralized gas - supply system is n ' t still perfect . the main factors are : 1 ) the purifier system having problems such as huge device , bas motion and low purifier efficiency so on ; ( 2 ) bad disposal of tar causing the secondary pollution 目前，生物质秸秆气化与集中供气系统尚不完善，主要原因一是净化系统存在设备庞大、运行不稳、净化效率低等问题；二是净化后焦油的处理不善，会造成二次污染。
One set of equipment for gas catalystic reconstruction developed by us own is illustrated in the following figure , in which tar sampling system is also included . in this thesis , the experiment system : biomass tar catalytic pyrolysis , which overcomes the disadvantage of mixture of some typical compound . and some improvement was made to adapt the characters of tar content of china 该试验装置克服了当前生物质焦油催化裂解研究中采用焦油的某一种组分或者几种组分的混合物作为其模拟化合物的缺点，以热解反应器产生的生物质气为焦油来源，在实验中对现有的焦油取样分析方法进行了改进，提出了适合我国生物质特点的焦油成份分析方法。
One set of composition analysis method was erected for biomass gasification tar , in which tar samples are separated into aliphatics , aromatics , ester , polar and aspheltenes fractions of increased polarity by one kind of chromatography , and gc / ms is used for the characterization of each fraction except aspheltenes 层析将焦油样品分离为脂肪类、芳香类、酯类、极性物、沥青质五个不同极性的族分，然后再对各族分采用gc - ms分别进行定性和定量分析，并最终获得焦油的主要组成信息。
The production of biomass tar is influenced by gasifier type biomass feedstock , gasification agent and operation parameters , and it may cause great harm to the gasification system and gas consummation equipment . however , traditional tar removal technology , such as filtration , wet cleaning and thermal decomposition , ca n ' t meet with the need for relatively clean gas 热解焦油的产生受到气化器类型、生物质原料类型和性质、气化介质、裂解气化条件等因素的影响，其对气化系统和用气设备等产生不利影响，而目前常采用的焦油脱除方法，如水洗、干式过滤等不能满足高效焦油脱除的要求。
In view of cost , the clarification effect and environmental protection , the cleaning system with coke as absorbent should be the fairly good choice that can produce less tar content and high quality household gas . the cost will be made fewer as well for the reason that coke in filter and clarifier - tank can be put into gasifier again to pyrolyze . in order to improve the clarification level and make preparations for generating electricity by means of biomass gasification technology 该试验装置克服了当前生物质焦汕催化裂解研究中采用焦油的某一种组分或者几种组分的混合物作为其模拟化合物的缺点，以热解反应器产生的生物质气为焦油来源，研究了生物质焦油的催化裂解原理、催化裂解中不同气化温度、裂解温度、停留时间对焦油成分和催化裂解效果的影响，并对比以前的试验结果进行了初步的理论分析。
The results reveal that the five - lump model can work with only the compositional information of the raw tar as the input parameters , and it can be used to predict the results of different cracking conditions and the final composition of residual tar . the simulation of the cracking process was satisfying 结果表明，五集总模型的应用可独立于焦油的来源和性质，对焦油转化过程动力学行为描述的准确度明显高于整体转化模型，且该模型不仅对裂化过程进行动力学模拟和结果预测，还可给出转化后焦油的构成等重要信息。
