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为高效利用钢铁厂200～450℃烟气余热,利用EES软件模拟计算了水蒸气朗肯循环(SRC)4种有机朗肯循环(ORC)和水蒸气-有机物联合双循环(S-ORC)的热效率、火用效率和单位质量工质的发电能力。通过比较各发电系统的性能,探讨了低温发电系统的优化措施。为进一步利用ORC系统透平机乏汽余热,针对300℃以上的热源设计了梯级有机朗肯循环(CORC)。综合考虑各发电系统的性能,得出:对于200～300℃的烟气,可采用以R141b为工质的ORC发电系统;对于300～450℃的烟气,可采用CORC发电系统。由于S-ORC的热效率、火用效率、发电功率比传统SRC的高,且能有效减小工质在冷凝器的负压,对于450℃以上的热源,可用S-ORC代替传统的SRC。
In order to efficiently utilize the residual heat of flue gas from 200 to 450 ℃ in steel mills, four organic Rankine cycles (ORC) and water vapor-organic combined double cycles (S-ORC) of steam-Rankine cycle (SRC) Thermal efficiency, exergy efficiency and unit mass of power generating capacity. By comparing the performance of each power generation system, the optimization measures of low temperature power generation system are discussed. In order to further utilize the steam-turbine waste heat of ORC turbines, a cascade organic Rankine cycle (CORC) was designed for heat sources above 300 ℃. Taking into account the performance of each power generation system, it is concluded that ORC power generation system with R141b as working fluid can be adopted for flue gas of 200 ~ 300 ℃, and CORC power generation system can be used for flue gas of 300 ~ 450 ℃. As S-ORC thermal efficiency, exergy efficiency, power generation than the traditional SRC high, and can effectively reduce the working fluid in the condenser negative pressure, for more than 450 ℃ heat source, the available S-ORC instead of the traditional SRC.