CAJ | 학술논문

在生物质气化过程中焦油是不利产物,由于焦油成分的复杂性,传统生物质气化热力学模型均未考虑焦油.为了研究操作运行条件对燃气成分、焦油等影响,本文引入焦油模型化合物,考虑系统散热和碳不完全转化等因素影响,基于物质平衡、能量平衡和化学反应平衡建立了考虑焦油的生物质气化过程热力学模型.使用Newton-Raphson方法对模型进行了求解.利用文献数据验证了模型的有效性.最后,利用所建模型计算了空气预热温度、空气当量比、水蒸汽添加率等操作条件对燃气成分、焦油含量等指标的影响.结果表明,空气预热温度提高,焦油含量下降,气体热值提高;空气当量比从0.2提高到0.3,焦油含量降低,燃气中有效成分减少;水蒸汽添加率从0增加到10%,焦油含量下降,气化效率提高.研究结果可为生物质能低焦清洁利用提供参考.
재생물질기화과정중초유시불리산물,유우초유성분적복잡성,전통생물질기화열역학모형균미고필초유.위료연구조작운행조건대연기성분、초유등영향,본문인입초유모형화합물,고필계통산열화탄불완전전화등인소영향,기우물질평형、능량평형화화학반응평형건립료고필초유적생물질기화과정열역학모형.사용Newton-Raphson방법대모형진행료구해.이용문헌수거험증료모형적유효성.최후,이용소건모형계산료공기예열온도、공기당량비、수증기첨가솔등조작조건대연기성분、초유함량등지표적영향.결과표명,공기예열온도제고,초유함량하강,기체열치제고;공기당량비종0.2제고도0.3,초유함량강저,연기중유효성분감소;수증기첨가솔종0증가도10%,초유함량하강,기화효솔제고.연구결과가위생물질능저초청길이용제공삼고.
Tar is a kind of very harmful product during the biomass gasification process, and it is not considered in the conventional thermodynamic mathematical model because of its components complexity. In order to research the effect of operation condition on ingredients and tar content of the fuel gas, a thermodynamic mathematical model of biomass gasification process with tar was developed based on material balance, energy balance and chemical equilibrium, taking the influences of system heat loss and carbon partial conversion into account. It is well known that the number of identified tar components is more than 100, and the components of quality ratio more than 5%are benzene, toluene, phenol, dimethylbenzene, phenylethylene, naphthalene, and so on. According to the quality equal principle of the main tar components, tar was indicated as the imaginary material C6H6.2O0.2 in the thermodynamic mathematical model. The chemical reactions selected in the model were from the deoxidization process as the reaction rate was much slower than the oxidization reaction. The model was solved with Newton-Raphson method, which was validated in comparison with literature data. In addition, the developed model was used to study the operating conditions, such as air preheating temperature, air equivalence ratio (ER) and steam ratio, on gas components and tar content. The results indicated that, with the increase in air preheating temperature, the tar content was decreased but the low heat value (LHV) was increased. When ER was increased from 0.2 to 0.3, the tar content and the LHV were both decreased. As steam ratio was increased from 0 to 10%, the tar content was decreased and gasification efficiency was improved. The results might provide valuable references for low-tar and clean utilizations of biomass gasification.