A Proposed Scheme for Coal Fired Combined Cycle and Its Concise Performance

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	A Proposed Scheme for Coal Fired Combined Cycle and Its Concise Performance
	Cai RX(蔡睿贤)
刊名	Cai Ruixian's Analects
	2009
卷号	1 期号:1 页码:307，319
关键词	bioheat transfer unsteady analytical solution
英文摘要	For IGCC,the primary mvestment is too high due to the demand of high gasification efficiency. For PFBCC,the thermal efficiency is too low due to the relatively low turbine inlet temperature and the hot working medium of the gas turbine is not easy to clean. A new scheme is proposed for coal fired combined cycle to overcome the main drawbacks of IGCC and PFBCC. The research targets are developing a new cycle construction of coal fired combines cycle to raise the efficiency and reduce the primary investment. Actually, the new scheme is a synthesis of some existing proposals. It adopts partial gasification to reduce the primary investment of the gasification equipment. The un-gasified surplus solid is then feed to a pressurized fluidized bed boiler,but adopting Curtiss Wright type external combustion t0 10wer the ash content in the working medium. The gas fuel from the partial gasifier is combusted in a top combustor to further increase the working medium temperature. An extremely concise performance estimation method for the new scheme and its equations is proposed in order to easily understand the basic physical meaning of the new system. Some typical calculations based on this concise method are given. Then, a more detailed computation is accomplished with Aspen Plus code. The basic feasibility of this scheme is proven to be favorable. The efficiency is higher than the existing coal fired lGCC plants. The advantage of the new scheme comes from the better utilization of coal energy. Almost all the energy of coal is first utilized in the top cycle,and then the bottom cycle,just like the gas fueled combined cycle does. The primary investment is lower than the ordinary IGCC due to the lack of air separation unit and the adoption of partial gasification. The ash content is much lower than that of the existing PFBCC plants. If no any harmful ash in working medium is required, the atmospheric fluidized bed can be applied rather than the pressurized fluidized bed. A similar proposal with atmospheric fluidized bed and its performance estimation are also given. However,its efficiency will be lower than the pressurized fluidized bed scheme.
WOS记录号	WOS:000245725200013
公开日期	2013-04-11
内容类型	期刊论文
源URL	[http://ir.etp.ac.cn/handle/311046/59789]
专题	工程热物理研究所_图书馆_所院士论文选集_蔡睿贤_期刊论文
推荐引用方式 GB/T 7714	Cai RX. A Proposed Scheme for Coal Fired Combined Cycle and Its Concise Performance[J]. Cai Ruixian's Analects,2009,1(1):307，319.
APA	蔡睿贤.(2009).A Proposed Scheme for Coal Fired Combined Cycle and Its Concise Performance.Cai Ruixian's Analects,1(1),307，319.
MLA	蔡睿贤."A Proposed Scheme for Coal Fired Combined Cycle and Its Concise Performance".Cai Ruixian's Analects 1.1(2009):307，319.