Connected-top-bottom-cycle to cascade utilize flue gas heat for supercritical carbon dioxide coal fired power plant

Thermodynamic and economic comparison of supercritical carbon dioxide coal‐fired power system with different improvements

“…9 Since the beginning of the 21st century, the SCO 2 power cycle has re-entered people's awareness with the development of the fourth generation nuclear reactor (Gen IV, core temperature 500-900 C). 6 This cycle can well match various types of heat sources and can be applied in many fields, such as nuclear power, [10][11][12] solar power, [13][14][15] thermal power, [16][17][18] and waste heat recovery. [19][20][21] At the same time, the SCO 2 cycle has high efficiency, compactness, and low noise.…”

How to Construct a Combined S-CO2 Cycle for Coal Fired Power Plant?

“…(1) The CO 2 temperature is high in the tail flue: differences of heating surface layout between this paper and [28] is that in this paper the preheater in tail flue is eliminated. This change means that the CO 2 at the outlet of HTR (point 4) enters the furnace directly rather than the tail flue.…”

“…The solutions for this problem can be divided into three categories: (1) adding flue gas cooler [21][22][23], (2) raising air temperature [18,24,25], (3) constructing combined cycle [26][27][28].…”

“…Both top and bottom cycles are S-CO 2 cycles. Sun et al [28] explore the power generation efficiency of applying different S-CO 2 bottom cycles to absorb residual heat, such as a simple recuperated cycle, partial cooling cycle, recompression cycle, etc. It is found that the suitable bottom cycle is different for different turbine inlet temperatures.…”

Friction pressure drop characteristics of supercritical CO<sub>2</sub> flowing upward in a vertical smooth tube

“…. 在最近的20年里, 研究的重 点是引入超临界水作为反应堆冷却剂 [2] , 主要关注其在 超临界压力下光管或强化管内的传热性能, 尤其是传 热恶化预测 [3] , 但缺少相关的流动压降实验数据和理 论依据, 特别是缺少高P/P c (临界压力P c =7.38 MPa)下 的实验结果 [4] , 这对超临界流体在高压下的压降计算 及循环优化提出了很大的挑战. 虽然这一领域已取得 了惊人的进展, 但是对超临界流体独特的传热流动机 理仍缺乏统一的认识 [5] .…”