摘要:

AbstractA model for the bed‐to‐wall heat transfer under low temperature condition in a circulating fluidized bed (CFB) was developed based upon a simplified cluster renewal concept. The age of clusters in contact with the wall at different locations along the height of the CFB was estimated as the weighted average age considering their formation and disintegration. One set of experimental data on heat transfer in a 4.5‐metre high, 0.15‐metre diameter CFB under low temperature condition (67–77°C) was chosen for comparison with prediction of local heat transfer coefficient. The experimental observation and prediction have shown a qualitative

ISSN:0363-907X    

DOI:10.1002/er.4440180102

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractThe generation of carbon fines by attrition during burning of Thai lignite char has been studied experimentally by means of a 92 mm i.d. continuous spouted bed combustor at different values of spouting gas velocity, bed temperature, and char feed size. Both inert particle size and static bed depth were fixed for all experimental runs. The collected data were used to analyse size distributions of both in‐bed particles and elutriated fines, and to generate the suitable correlations for carbon attrition rate. Results obtained showed that attrition rate in the spouted bed is proportional to the excess of gas velocity above the minimum spouting gas velocity and the overall bed carbon surface exposed to attrition. The attrition rate constant is slightly dependent on operating bed temperature. Its values for the char studied were 1.6511 × 10−6for 707°C operating bed temperature, and 1.1222 × 10−6for 850°C, with the average for all tested runs being 1.2

ISSN:0363-907X    

DOI:10.1002/er.4440180103

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractA simulation model of continuous lignite char combustion in a spouted bed has been developed to predict bed oxygen concentrations, bed particle size distribution, bed carbon loading, mean diameter of bed char, and the fractional combustion in spout, annulus, and fountain. The approach involves taking into account the spouted bed hydrodynamics, a burning law for individual particles, and the combines mass balances for bed char and oxidant in the three typical regions. The predicted results for various operating conditions are compared with some experimental data.

ISSN:0363-907X    

DOI:10.1002/er.4440180104

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractIn this paper, a performance evaluation of a newly developed blend of HFCs and HCFCs, as a substitute for CFC‐12, CFC‐502, and HCFC‐22, is presented. The blend's performance has been evaluated using water/air, air/air and water/water heat pumps, as well as a domestic refrigerator. The test results showed that the blend is not only environmentally sound, but it also enhances the performance by 7% to 30%, depending upon the applic

ISSN:0363-907X    

DOI:10.1002/er.4440180105

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractA reformulation of global warming potentials is propounded, that combines the time‐horizon and discounting definitions, and covers both ordinary atmospheric forcing (via greenhouse gases) and its rate‐of‐change. Insofar as GWPs are used to guide investment and socioeconomic choices, there is merit in adopting cost‐benefit techniques. The parametric equivalence of the two definitions applies for the ordinary atmospheric forcing; but for its rat‐of‐change, only the discounting definition gives realistic results, as shown in application to methane, a short‐lived g

ISSN:0363-907X    

DOI:10.1002/er.4440180106

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

ISSN:0363-907X    

DOI:10.1002/er.4440180101

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY