Abstract
The ultra-supercritical (USC) double-reheat technology is an immediate area of research focus in China, since the thermal efficiency of USC double-reheat unit is higher than the USC single-reheat unit. The parameters and capacity of USC double-reheat unit in China have made major breakthroughs, and the thermal efficiency of the units are as high as 47–48%, which is the highest in the world. USC double-reheat boiler is one of the most important devices for USC double-reheat unit, and the design concept and precision have a vital effect on the operation of boiler and power station. The most difficult and important factors in the design of double-reheat boiler are the layout of heating surface and the steam temperature regulation method. Therefore, this work summarizes the arrangement of heating surface and temperature regulation method of existing double-reheat boiler in China. It is hoped that the work will set a benchmark for the development of double-reheat boiler and the future 700 °C power generation unit in the world.
Highlights
IntroductionCoal is the primary energy source and plays a dominant role in thermal power generation in China
Studied the influence of flue gas damper (FGD), flue gas recirculation (FGR), and tilting burners (TB) regulation and the result showed that the variation of dampers opening hasFGR, the greatest influence on temperatures, the regulation method
FGD, and TB regulation andthe thereheat resultsteam showed that the variation of dampers openadopted for different boilers depends the characteristics of the heating surface arrangeing has the greatest influence on theon reheat steam temperatures, the regulation method ment, combustion system, operational mode, initial investment, and the efficiency of the power plant
Summary
Coal is the primary energy source and plays a dominant role in thermal power generation in China. The emissions of CO2 , which is a greenhouse gas, are another serious environmental problem caused by coal combustion. These pollution problems are harmful to both human health and the development of society [2,3]. It is generally understood that the improvement in thermal efficiency is bound with low coal consumption and low pollution emissions as well as low CO2 emissions [4,5]. Based on the above cognition, the development of high-parameter and large-capacity ultra-supercritical (USC) units with high efficiency for reducing pollutant emissions is greatly promoted in the world
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