Dynamic characteristics of a solar-aided coal-fired power generation system under direct normal irradiance (DNI) feedforward control
Dynamic characteristics of a solar-aided coal-fired power generation system under direct normal irradiance (DNI) feedforward control
复制标题
直接法向辐照度（DNI）前馈控制下太阳能辅助燃煤发电系统的动态特性
DOI：
10.1002/ese3.592
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发表时间：
2019
影响因子：
3.8
通讯作者：
Yongping Yang
中科院分区：
文献类型：
--
作者：
Liping Pang;Peixin Lv;Liqiang Duan;Yongping Yang
太阳能辅助燃煤发电（SAPG）系统是太阳能热发电领域的一种新型发电系统。但是，太阳辐射的不稳定性会引起蒸汽温度的波动，这对锅炉和汽轮机的运行不利。本文以某600 MW亚临界燃煤发电机组为研究对象，应用TRNSYS软件建立了SAPG的暂态仿真模型。建立了汽温动态前馈控制系统。一些基本参数，如燃料消耗率、太阳能加热蒸汽抽取率、喷水流量和烟气挡板开度，都在直接法向辐照度（DNI）的控制下。利用典型气象资料分析了SAPG的动力学特征。仿真结果表明，在节油模式下，当太阳辐照度变化时，采用DNI前馈控制的汽温控制系统，SAPG系统实现了4.9%的减煤量，主汽温波动小于5°C，再热汽温降低在合理范围内。发电波动小于10兆瓦，太阳能发电效率达到22.5%。对电站锅炉烟气侧和水汽侧的部分参数进行了仿真，验证了DNI控制的有效性。
A solar‐aided coal‐fired power generation (SAPG) system is a new type of power generation system in the field of solar thermal power generation. However, the instability of solar radiation will cause fluctuations in steam temperature, which is unfavorable for the operation of boilers and steam turbines. Based on a 600 MW subcritical coal‐fired power generation unit, TRNSYS software is applied to establish a transient simulation model of SAPG in this paper. A dynamic feedforward control system for steam temperature is set up. Some essential parameters, such as the fuel consumption rate, solar‐heated steam extraction rate, water spraying flow rate, and flue gas damper opening, are under the control of direct normal irradiance (DNI). Then, the dynamic characteristics of SAPG are analyzed using typical weather data. The simulation results show that under the fuel‐saving mode, when solar irradiation changes, the SAPG system achieves a coal reduction of 4.9% by using the steam temperature control system with DNI feedforward control, and the main steam temperature fluctuation is less than 5°C with the reheat steam temperature reduced within a reasonable range. The power generation fluctuation is less than 10 MW, and the solar‐to‐electricity efficiency reaches 22.5%. Some parameters on both the flue gas side and the water/steam side in the utility boiler are simulated to demonstrate the effectiveness of DNI control.