At present, methanol to propylene(MTP) technology developed by Lurgi Company is adopted for commercial plants and refined methanol with the purity ≥99.85 wt% is required as the feed of MTP unit in Lurgi's technol...At present, methanol to propylene(MTP) technology developed by Lurgi Company is adopted for commercial plants and refined methanol with the purity ≥99.85 wt% is required as the feed of MTP unit in Lurgi's technology.Therefore, high energy cost for refined methanol production is one of the bottlenecks to improve the economy of MTP technology. Reducing the grade of feed refined methanol may be an effective method to save energy and reduce operation costs in MTP process. In this work, experiments and process simulation were carried out to investigate the influence and feasibility of degrading the methanol feed. Experiments were conducted to investigate the influence of crude methanol feed on conversion and selectivity of MTP reaction as well as the performance of ZSM-5 catalyst. The experimental results showed that degrading the methanol feed had no obvious influence on the conversion and selectivity of MTP reactions and the catalyst deactivation was caused by the carbon accumulation and metals deposition on the active sites. The process simulation results showed that the influence on the conversion and selectivity as well as the stream load of MTP process was negligible if 98 mol% methanol was used as feed. Finally, industrial experiments were conducted by adjusting the operation parameters to degrade of feed methanol of the commercial 500 kt·a^(-1) MTP unit of Ningmei Group in China. The results of industrial application illustrated that annually 180 kt fuel coal and 150 kt desalted water as well as 1770 MW·h^(-1) electricity would be saved when the water content increased from 0.01% to 0.4%. This work has identified the feasibility to improve MTP technology by degrading the methanol feed.展开更多
Government Performance Management is a new government management pattern. It plays an important role in the development of the local government and an important part of the government human resource management. Since ...Government Performance Management is a new government management pattern. It plays an important role in the development of the local government and an important part of the government human resource management. Since China began to implement its government performance management, it has obtained some initial results. But it is still in the exploratory and improvement stage. Because a lot of problems arise in the actual operation process, so theoretical research and practice experience need to be further improved. Therefore, analyzing the local government perfornaance management problems and exploring strategies to improve the performance management are currently the objective requirements of the socialist market economy construction and governance reform in China and will have great significance.展开更多
Culture is one of the important properties of language, and language can not be separated from society and culture. Every language is the reflection of culture with profound cultural connotations. Many experts and sch...Culture is one of the important properties of language, and language can not be separated from society and culture. Every language is the reflection of culture with profound cultural connotations. Many experts and scholars have generally agreed that intercultural communication competence is an important purpose of language learning. The process of learning English is the process to understand and master English cultural and knowledge, and mastery degree of English-speaking countries and cultural knowledge directly affects practical skills of one person.展开更多
基金Supported by the National Key R&D Program of China(2017YFB0601902)
文摘At present, methanol to propylene(MTP) technology developed by Lurgi Company is adopted for commercial plants and refined methanol with the purity ≥99.85 wt% is required as the feed of MTP unit in Lurgi's technology.Therefore, high energy cost for refined methanol production is one of the bottlenecks to improve the economy of MTP technology. Reducing the grade of feed refined methanol may be an effective method to save energy and reduce operation costs in MTP process. In this work, experiments and process simulation were carried out to investigate the influence and feasibility of degrading the methanol feed. Experiments were conducted to investigate the influence of crude methanol feed on conversion and selectivity of MTP reaction as well as the performance of ZSM-5 catalyst. The experimental results showed that degrading the methanol feed had no obvious influence on the conversion and selectivity of MTP reactions and the catalyst deactivation was caused by the carbon accumulation and metals deposition on the active sites. The process simulation results showed that the influence on the conversion and selectivity as well as the stream load of MTP process was negligible if 98 mol% methanol was used as feed. Finally, industrial experiments were conducted by adjusting the operation parameters to degrade of feed methanol of the commercial 500 kt·a^(-1) MTP unit of Ningmei Group in China. The results of industrial application illustrated that annually 180 kt fuel coal and 150 kt desalted water as well as 1770 MW·h^(-1) electricity would be saved when the water content increased from 0.01% to 0.4%. This work has identified the feasibility to improve MTP technology by degrading the methanol feed.
文摘Government Performance Management is a new government management pattern. It plays an important role in the development of the local government and an important part of the government human resource management. Since China began to implement its government performance management, it has obtained some initial results. But it is still in the exploratory and improvement stage. Because a lot of problems arise in the actual operation process, so theoretical research and practice experience need to be further improved. Therefore, analyzing the local government perfornaance management problems and exploring strategies to improve the performance management are currently the objective requirements of the socialist market economy construction and governance reform in China and will have great significance.
文摘Culture is one of the important properties of language, and language can not be separated from society and culture. Every language is the reflection of culture with profound cultural connotations. Many experts and scholars have generally agreed that intercultural communication competence is an important purpose of language learning. The process of learning English is the process to understand and master English cultural and knowledge, and mastery degree of English-speaking countries and cultural knowledge directly affects practical skills of one person.
