固体氧化物电解槽辅助煤电机组深度调峰技术可行性研究

Feasibility study on deep peak shaving technology for SOEC assisted coal-fired power units

常规的煤电机组灵活性改造方案,难以消除频繁快速变负荷对热力系统造成的潜在寿命折损与设备安全风险。为提高煤电机组参与深度调峰的长期安全性与经济性,以某国产超超临界二次再热1000 MW燃煤机组为应用对象,提出了基于氢储能系统的煤电机组“健康调峰”技术路线,并论证了调峰煤电制氢的间接碳减排意义。在此基础上,分析比较了不同制氢工艺与煤电厂生产条件的匹配程度,认为固体氧化物电解槽(SOEC)制氢为综合最优方案,据此给出了SOEC耦合煤电调峰的原理性设计方案,最后以年度负荷曲线对新方案进行了财务分析。计算结果表明,示例机组自第6年起每年可获得1.07亿元/年的净利润,每年减少碳排放281.92 t,同时获得设备延寿、降耗减碳等其他收益。相关结论对于指导调峰煤电机组的健康安全运行具有参考意义。

The conventional flexible retrofit plan for coal motor sets is difficult to eliminate the potential life loss and equipment safety risks caused by frequent and rapid load changes to the thermal system.In order to improve the long-term safety and economy of coal-fired power units participating in deep peak shaving,a“healthy peak shaving”technical route for coal-fired power units based on hydrogen energy storage system is proposed,with a domestic ultra supercritical secondary reheat 1000 MW coal-fired unit as the application object.The indirect carbon emission reduction significance of peak shaving coal-fired power hydrogen production is demonstrated.On this basis,the matching degree between different hydrogen production processes and the production conditions of coal-fired power plants were analyzed.It was believed that solid oxide electrolysis cell(SOEC)hydrogen production was the comprehensive optimal plan.Based on this,a principle design scheme for SOEC coupled coal-fired power peak shaving was proposed.Finally,a financial analysis was conducted on the new plan using the annual load curve.The calculation results indicate that,the SOEC assisted deep peak shaving of coal-fired power can increase the annual revenue of the example unit by 236 million yuan,and obtain other benefits such as equipment lifespan extension,consumption reduction,and carbon reduction.The relevant conclusions have reference significance for guiding the healthy and safe operation of peak shaving coal-fired power units.