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首页> 外文期刊>Energy Conversion & Management >Techno-economic evaluation of polygeneration system for olefins and power by using steel-mill off-gases
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Techno-economic evaluation of polygeneration system for olefins and power by using steel-mill off-gases

机译：用钢磨机废气计算烯烃和功率的多结型系统的技术经济评价

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Utilization of industrial off-gases to produce valuable chemicals has the advantages of reducing dependence on fossil fuels. Despite many studies of off-gas utilization, production of secondary chemicals including detailed kinetic models integrated with a power-generation system to fully utilize byproducts has not been considered. The goal of this study was to techno-economically evaluate a polygeneration system to produce olefins and power from steel-mill off-gases. Two process cases were evaluated; they use carbon monoxide-rich Linz-Donawitz converter gas with either hydrogen or coke oven gas as feed. The hydrogen was concentrated from coke oven gas by using membrane-separation technology. These gases reacted with Linz-Donawitz converter gas to yield methanol, which was then converted to olefins. Kinetic models were applied for methanol synthesis and methanol-to-olefin reaction. Heat exchanger networks are designed to minimize utility usage, and a power generation system that uses the Rankine cycle to fully utilize byproduct stream. Calculated minimum selling prices of ethylene by discounted cash flow analysis were US$ 2030.tonne(-1) when hydrogen was the feed gas, and US$ 1064.tonne(-1) when coke oven gas was the feed gas; both were higher than the current minimum selling price (similar to US$ 720.tonne(-1)) of ethylene derived from naphtha. The reduction in minimum selling price by use of coke oven gas is due to the revenue of power generation from coke oven gas retentate. Linz-Donawitz converter gas production with hydrogen is the most sensitive to feed price, whereas Linz-Donawitz converter gas-with-coke oven gas is the most sensitive to capital investment. The analysis demonstrates that neither system is economically viable under the current condition. The findings of this study represent a basic analysis for future improvements of the off-gas to olefins process, especially highly integrated system with power generation.
机译：工业废气的利用产生有价值的化学品，具有减少对化石燃料的依赖性的优势。尽管对废气利用有很多研究，但尚未考虑包括与发电系统集成的详细动力学模型的二级化学品，并未考虑完全使用副产品。本研究的目标是技术 - 经济地评估多项式系统，以生产烯烃和来自钢制磨废气的电力。评估两种过程病例;它们使用一氧化碳丰富的Linz-DONAWITZ转换器气体与氢气或焦炉气体作为进料。通过使用膜 - 分离技术从焦炉气体中浓缩氢气。这些气体与Linz-Donawitz转换器气体反应，得到甲醇，然后将其转化为烯烃。施用动力学模型用于甲醇合成和甲醇 - 烯烃反应。热交换器网络旨在最大限度地减少实用程序使用，以及使用Quankine周期的发电系统充分利用副产品流。计算出折扣现金流量分析的最低销售价格为2030美元。氢气是饲料天然气的US $ 2030.Tonnton（-1），当焦炉气体是饲料气体时，1064.Tonnton（-1）;两者都高于目前的最低售价（类似于来自石脑油的乙烯的720美元）。通过使用焦炉气体的最低销售价格的降低是由于焦炉储存的发电收入。 Linz-Donawitz Converter气体生产与氢气是最敏感的饲料价格，而Linz-Donawitz转换器气体 - 斗灶烤箱气体对资本投资最敏感。该分析表明，在当前条件下，两种系统都没有经济上可行。本研究的调查结果代表了未来对烯烃过程的未来改进的基本分析，特别是具有发电的高度集成系统。

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