This paper presents some practical applications of signed directed graphs （SDGs） to computeraided hazard and operability study （HAZOP） and fault diagnosis, based on an analysis of the SDG theory. The SDG is modele...This paper presents some practical applications of signed directed graphs （SDGs） to computeraided hazard and operability study （HAZOP） and fault diagnosis, based on an analysis of the SDG theory. The SDG is modeled for the inversion of synthetic ammonia, which is highly dangerous in process industry, and HAZOP and fault diagnosis based on the SDG model are presented. A new reasoning method, whereby inverse inference is combined with forward inference, is presented to implement SDG fault diagnosis based on a breadth-first algorithm with consistency rules. Compared with conventional inference engines, this new method can better avoid qualitative spuriousness and combination explosion, and can deal with unobservable nodes in SDGs more effectively. Experimental results show the validity and advantages of the new SDG method.展开更多
基金the National High-Tech Research and Development (863) Program of China (No. 2003AA412310)
文摘This paper presents some practical applications of signed directed graphs （SDGs） to computeraided hazard and operability study （HAZOP） and fault diagnosis, based on an analysis of the SDG theory. The SDG is modeled for the inversion of synthetic ammonia, which is highly dangerous in process industry, and HAZOP and fault diagnosis based on the SDG model are presented. A new reasoning method, whereby inverse inference is combined with forward inference, is presented to implement SDG fault diagnosis based on a breadth-first algorithm with consistency rules. Compared with conventional inference engines, this new method can better avoid qualitative spuriousness and combination explosion, and can deal with unobservable nodes in SDGs more effectively. Experimental results show the validity and advantages of the new SDG method.
文摘采用生命周期评价方法,以1 t液态合成氨为功能单位,构建了“从摇篮到大门”的煤制合成氨碳足迹核算模型,以调研得到的国内煤制合成氨企业生产数据为基础进行了碳足迹核算和减排措施分析。结果表明:煤制1 t液态合成氨产品的碳足迹为6204.11 kg CO_(2)e,其中氨合成阶段由于化学反应造成的CO_(2)直接排放占生命周期碳足迹的47.12%,应作为减排的关注重点;从提升能源效率、采用负碳技术两方面考虑,分别采用煤化学链制氢技术和碳捕集技术降低碳排放,与传统工艺相比,采用煤化学链制氢技术可使碳足迹降低27.99%,采用碳捕集技术可使碳足迹降低46.36%,后者的碳减排潜力更大,应着重发展。
