The correlation based zonal method and its application to the back pass channel of oxy/air-fired CFB boiler

被引：18

作者：

Bordbar, Mohammad Hadi ^{[1
]}

Hyppanen, Timo ^{[1
]}

机构：

[1] Lappeenranta Univ Technol, Dept Energy Technol, FIN-53851 Lappeenranta, Finland

来源：

APPLIED THERMAL ENGINEERING | 2015年 / 78卷

关键词：

Radiative zone method; Direct exchange area; Correlation based zone method (CBZM); Circulating fluidized bed; Numerical modeling; Non-gray gas modeling; Oxygen fired combustion; RADIATIVE HEAT-TRANSFER; OXY-FUEL COMBUSTION; GRAY-GASES MODEL; WEIGHTED-SUM; ENCLOSURE; EXCHANGE;

D O I：

10.1016/j.applthermaleng.2014.12.046

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A set of correlations for direct exchange area (DEA) between zones are presented. The correlations are simpler and much faster than the classical method used for DEA calculations in zone method. Additionally a unique form of correlation supports both singular and non-singular DEA calculation and no extra effort for non-singular cases is needed. Using the new correlations, the correlation based zone method (CBZM) is introduced and validated by several benchmarks. The CBZM results were in excellent agreement with the benchmark solutions. As an application case, by using the CZBM the gray and non-gray radiative heat transfer has been analyzed in a large back pass channel of a CFB boiler for the case of air and oxygen-fired combustion scenarios. The effect of the spectral radiative behavior of combustion gases on the predicted radiative heat fluxes on the walls is addressed. The effect of combustion scenario on the operation of the unit is also discussed. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：351 / 363

页数：13

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