中低温废热与甲醇重整结合的氢电联产系统

提出了烧结机烟气中低温废热与甲醇蒸汽重整制氢整合的新方法,模拟建立了中低温废热结合甲醇重整制氢的系统.基于能的品位概念,采用EUD图像火用分析方法,揭示低品位的中低温废热转化为高品位化学能的能量转换特性;研究了中低温废热品位的提升随甲醇重整反应温度的变化规律.研究结果表明:新型制氢系统的火用效率有望达到82 8%,比传统甲醇制氢系统约高12个百分点,甲醇燃料节能率23.7%.另外,初步静态经济性分析表明:新系统可使氢气生产成本约为1.5元/m3,远低于电解水制氢成本(5.5元/m3).当甲醇原料成本价格保持在一定的价格范围内,其制氢成本可以与传统天然气制氢成本1.2元/m3相竞争.本研究为冶金工业同时解决中低温废热利用和制氢能耗高的难题提供了一个新途径.

A Hydrogen-power Cogeneration System Set up by Combining Medium-and-low Temperature Waste Heat with Methanol Reforming

A new approach was presented for combining the medium-and-low temperature waste heat in sintered gas with methanol steam reforming to produce hydrogen.A hydrogen production system by combining medium-and-low temperature waste heat with methanol reforming was established and simulated.On the basis of an energy grade concept and by using an energy utilization diagram(EUD) image-based exergy analytic method,revealed were the energy conversion characteristics featuring the conversion of low grade medium-and-low temperature waste heat to high grade chemical energy.Studied was the variation law governing the upgrading of medium-and-low temperature waste heat with methanol reforming reaction temperatures.The research results show that the exergy efficiency of the new type hydrogen production system is expected to reach 82.8%,12 percentage points higher than that of a traditional methanol-based hydrogen-production system.The energy-saving rate of methanol fuel is 23.7%.In addition,a preliminary static economic analysis indicates that the hydrogen production cost of the new system is about RMB 1.5 yuan/m~3,far lower than that of water electrolysis(RMB 5.5 yuan/m~3).When the cost of raw material methanol price is maintained within a certain price range,the hydrogen production cost can be competitive with the traditional natural gas-based hydrogen production cost of RMB 1.2 yuan/m~3.The foregoing can provide a new approach to the metallurgical industry for both solving a technically intractable problem of utilizing medium-and-low temperature waste heat and coping with a high energy consumption for hydrogen production.