350 兆瓦超临界机组低负荷运行模拟

IF 2.6 4区 工程技术 Q3 ENERGY & FUELS Frontiers in Energy Research Pub Date : 2024-09-05 DOI:10.3389/fenrg.2024.1448416
Shiming Xu, Bo Yu, Qiang Zhou, Xiangyu Zhang, Fujun Wang, Huaichun Zhou
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引用次数: 0

摘要

为准确了解燃煤机组在低负荷条件下的运行特性,为灵活性改造提供设计依据,建立了包括烟气和空气系统、蒸汽和水系统、汽轮机和蒸汽抽余热系统在内的锅炉和汽轮机耦合仿真模型,并提出了低负荷条件下的迭代计算策略。模拟计算以 350 MW 超临界燃煤机组为对象,模型结果与机组设计和运行参数高度吻合。在 269MW 条件下,模型预测的空气预热器出口烟气温度与实际运行结果之间的最大计算误差为 8.84%。造成这一误差的原因是运行烟气温度突然升高,这可能与空气预热器的堵塞有关。而低负荷条件下的模拟结果表明,当机组负荷低于 20% 时,炉膛总风量控制在不低于最大连续额定值 (BMCR) 时风量的 30%,最小给水流量可降至汽轮机热量接受 (THA) 负荷时的 20%,机组在 20% 负荷左右切换至湿态运行。随着机组负荷的降低,发电耗煤量和汽轮机耗热量都会显著增加。与 BMCR 负荷相比,30% 负荷时的发电耗煤量增加了 13.3%,而在湿态运行的 15% 负荷时,发电耗煤量增加了 32.5%。在低负荷条件下,可以通过降低烟气中的含氧量、减少最小给水流量和实施锅炉水再循环来降低机组的煤耗率。
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Simulation of low-load operation for a 350 MW supercritical unit
Currently, there is a scarcity of studies exploring the safe operating parameters for coal-fired power units at loads below 30%.To accurately understand the operating characteristics of coal-fired units under low load conditions, and to provide a design basis for flexibility modifications, a simulation model coupled with boiler and turbine was established, which includes the flue gas and air system, steam and water system, steam turbine, and steam extraction heat recovery system, and the iterative calculation strategy for low load conditions was proposed. The simulation calculation was performed on a 350 MW supercritical coal-fired unit, with the model results showing a high degree of alignment with the unit’s design and operational parameters. Under the condition of 269MW, the maximum calculation error between the model’s predicted exit flue gas temperature of the air preheater and the actual operational results was 8.84%. This discrepancy was due to a sudden increase in the operating flue gas temperature, which may be associated with a blockage in the air preheater. And the simulation results under low load conditions indicate that when the unit load is below 20%, the furnace total airflow is controlled to no less than 30% of the airflow at Maximum Continuous Rating (BMCR) and the minimum feedwater flow rate can be reduced to 20% of that in Turbine Heat Acceptance (THA) load, and the unit switches to wet state operation around 20% load. As the unit load decreases, the coal consumption rate for power generation and steam turbine heat consumption rate both increase significantly. The coal consumption rate for power generation at 30% load is increased by 13.3% compared to BMCR load, and it is increased by 32.5% at 15% load which is operated in wet state. Under low load conditions, the coal consumption rate of the unit can be reduced by decreasing the oxygen content in the flue gas, reducing the minimum feedwater flow rate, and implementing boiler water recirculation.
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来源期刊
Frontiers in Energy Research
Frontiers in Energy Research Economics, Econometrics and Finance-Economics and Econometrics
CiteScore
3.90
自引率
11.80%
发文量
1727
审稿时长
12 weeks
期刊介绍: Frontiers in Energy Research makes use of the unique Frontiers platform for open-access publishing and research networking for scientists, which provides an equal opportunity to seek, share and create knowledge. The mission of Frontiers is to place publishing back in the hands of working scientists and to promote an interactive, fair, and efficient review process. Articles are peer-reviewed according to the Frontiers review guidelines, which evaluate manuscripts on objective editorial criteria
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