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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第8期    总第264期    2016年8月

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文章编号:1672-7207(2016)08-2864-09
涡耗散模型和混合分数模型模拟锅炉煤粉掺烧污泥过程的适应性
朱天宇1, 2,殷立宝1,湛志钢1,徐齐胜1,方庆艳2,张成2,陈刚2

(1. 广东电网公司 电力科学研究院,广东 广州,510080;
2. 华中科技大学 煤燃烧国家重点实验室,湖北 武汉,430074
)

摘 要: 分别使用组分输运涡耗散模型(EDM)和混合分数PDF模型,对1台100 MW四角切圆锅炉燃烧煤粉和掺烧污泥时,进行炉内流动、燃烧和污染物NOx排放数值模拟研究。研究结果表明:2种模型均能较好地模拟单煤燃烧时炉膛内部温度场和速度场;模拟烟气组分O2和CO2体积分数相接近,均较符合实际情况;EDM方法能较好地模拟水分吸热对炉膛燃烧的影响,在锅炉掺烧不同含水率污泥的燃烧数值模拟方面相比PDF模型更加合理;对比实际锅炉掺烧含水率为56%的不同配比污泥,模拟结果与现场试验结果相符,表明EDM能合理地模拟不同比例的高水分污泥的掺混燃烧。

 

关键词: 锅炉;煤泥掺烧;数值模拟;EDM;PDF模型

Adaptability of PDF transport model and eddy-dissipation model in simulation of coal combustion and co-combustion with sludge in coal-fired boiler
ZHU Tianyu1, 2, YIN Libao1, ZHAN Zhigang1, XU Qisheng1, FANG Qingyan2, ZHANG Cheng2, CHEN Gang2

1. Electric Power Research Institute, Guangdong Power Grid Corporation, Guangzhou 510080, China;
2. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China

Abstract:The numerical simulations using probability density function (PDF) transport model and eddy-dissipation model (EDM) were carried out to evaluate the characteristics of coal combustion and coal combined firing with sludge in a 100 MW tangentially coal fired utility boiler. The characteristics of flow, combustion and NOx emissions were studied. The results show that two models can both simulate successfully the temperature and velocity fields of the boiler for coal fired case; flue gas components like O2 and CO2 volume fractions are in line with the actual situation when these two kinds of model are adopted; H2O concentration is better simulated using EDM than PDF model; the effects of moisture absorption of heat are simulated well for combustion characteristic of the boiler, and NOx emission is better simulated. For high moisture sludge co-combustion, EDM has more advantages. Compared with field test when moisture rate of sludge is 56% for different mass ratios of sludge co-combustion in the furnace, simulation results using EDM correspond well, which shows that EDM can effectively simulate the effects of co-combustion with different mass ratios and high moisture content of sludge.

 

Key words: boiler; co-combustion with sludge; numerical simulation; EDM; PDF transport model

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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