Increasing operational flexibility of supercritical coal-fired power plants by regulating thermal system configuration during transient processes

Flexibility Transformation Decision-Making Evaluation of Coal-Fired Thermal Power Units Deep Peak Shaving in China

“…The proportion of wind energy and solar energy in-stalled capacity will continue to increase and is expected to exceed 64% of the total installed capacity by 2050 [17]. In the future, the overall strategy for the optimization of power generation structure in China will be to increase the proportion of renewable energy power generation, gradually reduce the proportion of coal-fired thermal power generation, and carry out peak shaving flexibility transformation for coal-fired thermal power plants [18]. Therefore, to vigorously develop new energy power generation, it is necessary to gradually strengthen the peak shaving capacity of thermal power generation, so that thermal power, especially coal-fired units, becomes the main force for deep peak shaving and frequency modulation of the power grid.…”

Quantitative Analysis of Energy Storage in Different Parts of Combined Heat and Power Plants

“…Zhao Y. [18] compared six methods for improving flexibility in reheat system of turbine in coal-fired plants and found that increasing the condensate water flow by low-pressure heaters is an only way suitable for decreasing the power load. Zhao Y.…”

“…[19] analyzed the other five measures of regulating extraction steam of high-pressure heaters for increasing power load. Quantitative analysis of ES in CW can be derived by experiments [17] or calculation method [16,18,20]. In a condensate throttling experiment, water level of deaerator must be monitored carefully, or units' safety will be threatened.…”

“…In a condensate throttling experiment, water level of deaerator must be monitored carefully, or units' safety will be threatened. The ES in CW is usually described by regulating time and total energy capacity [16,18,20], which are not facilitate for control modeling and design.…”

“…ES in DHN is 2 orders of magnitude larger than that in unit. ES capacity in different parts is calculated and compared in the same CHP unit, instead of studying ES in a certain part of the unit [18].  Considering the capacity, load response speed characteristics and replenishment mechanisms of ES, we give recommendations to increase power load flexibility that using ES in boiler and DHN to reduce fuel fluctuation when power load change frequently,…”