基于矩阵法的燃煤机组混合发电系统性能研究

Performance research on coal-fired hybrid generation system based on matrix method

新能源与化石能源互补发电可解决单纯新能源发电投资成本高、利用率低等问题，可维持发电系统稳定性及连续性，实现更深层次的节能减排。以300MW机组为例，建立了由太阳能、生物质能组成的辅助系统作用于燃煤机组回热系统的热经济性分析矩阵模型。结果表明：辅助系统作用于高加侧的经济性好于低加侧，并随分流系数增大高加侧的优势更明显；高加侧各加热器中，辅助系统作用于1号高加时混合发电系统的热力性能最好；分流系数增至完全排挤汽轮机抽汽时，混合发电系统各性能指标达最大值，汽轮机做功及绝对内效率提高率分别达0．42％～8．74％，0．42％～7．2％。

An electric generation combined with fossil energy and new energy provides an efficient way to solve the problems of high investment costs and low utilization ratio in new energy power generation system, and maintains the stability and continuity of power generation system, which efficiently achieves the goal of energy conservation and emis- sion reduction. Taking a 300MW unit for instance, a matrix model for thermal economic analysis of coal-fired hybrid generation is established when auxiliary system acting on regenerative system. Results show that the thermal perform- ance when auxiliary system acting on high-pressure heaters is superior to that on low-pressure heaters, and tends to be better with the increasing of shunt coefficient. Optimal thermal performance will be obtained when auxiliary system acts on No. 1 heater. Performance indices of hybrid power generation reach a maximum in the condition of turbine extrac- tion totally supplanted by auxiliary system, and the turbine output and absolute internal efficiency are improved by 0.42 % -8.74 % and0.42 % -7.2 %, respectively.