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Influence of Recirculated Flue Gas Distribution on Combustion and NOx Formation Characteristics in S-CO_(2) Coal-fired Boiler
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作者 Peipei WANG Mingyan GU +3 位作者 Yao FANG Boyu JIANG Mingming WANG Ping CHEN 《Mechanical Engineering Science》 2021年第2期42-52,共11页
Supercritical carbon dioxide(S-CO_(2))Brayton power cycle power generation technology,has attracted more and more scholars'attention in recent years because of its advantages of high efficiency and flexibility.Com... Supercritical carbon dioxide(S-CO_(2))Brayton power cycle power generation technology,has attracted more and more scholars'attention in recent years because of its advantages of high efficiency and flexibility.Compared with conventional steam boilers,S-CO_(2) has different heat transfer characteristics,it is easy to cause the temperature of the cooling wall of the boiler to rise,which leads to higher combustion gas temperature in the furnace,higher NOX generation concentration.The adoption of flue gas recirculation has a significance impact on the combustion process of pulverized coal in the boiler,and it is the most effective ways to reduce the emission of NOX and the combustion temperature in the boiler.This paper takes 1000MW S-CO_(2) T-type coal-fired boiler as the research target to investigate the combustion and NOX generation characteristics of S-CO_(2) coal-fired boilers under flue gas recirculation condition,the influence of recirculated flue gas distribution along the furnace height on the characteristics of NOX formation and the combustion of pulverized coal.The results show that the recirculated flue gas distribution has the great impact on the concentration of NOX at the boiler outlet.When the bottom recirculation flue gas rate is gradually increased,the average temperature of the lower boiler decreases and the average temperature of the upper boiler increases slightly;The concentration of NOx at the furnace outlet increases. 展开更多
关键词 S-CO_(2)boiler pulverized coal combustion NOX emission flue gas recirculation Recirculated flue gas distribution
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Thermodynamic analysis of improvement of converter gas by injecting pulverized coal into vaporization cooling flue 被引量:4
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作者 Jian-an Zhou Xue-kai Jiang +4 位作者 Jian-bo Xie Hua Zhang Lei Li Bao Wang Hong-wei Ni 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2018年第1期65-71,共7页
In order to improve the calorific value and the recovery yield of converter gas during the steelmaking process, a novel and thermodynamically admissible process was proposed. This method involved injecting pulverized ... In order to improve the calorific value and the recovery yield of converter gas during the steelmaking process, a novel and thermodynamically admissible process was proposed. This method involved injecting pulverized coal into the vaporization cooling flue of a converter, and the approach was developed based on an industrial 30 t converter. The effects of temperature, O2 content, and the volumetric ratio of CO to CO2 on the conversion of the mixed components of gas were analyzed using thermodynamic calculations. Furthermore, the effect of the injection rate on the quality and quantity of gas was investigated. The results show that the O2 and CO2 components of flue gas decrease as the injection rate increases, whereas the CO and H2 components synchronously increase. With the injection rate of 30 kg min-1, the 02 and CO2 components of the gas decreased by 64.12 and 41.19%, respectively, while the CO and H2 increased by 20.09 and 236.84%, respectively, and the recovery time of gas increased by 11.61%, compared to non-injection. 展开更多
关键词 CONVERTER gas recovery Vaporization cooling flue CO2 pulverized coal
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火力发电厂烟风煤粉管道加固肋设计计算分析 被引量:11
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作者 王欣 郭小明 +2 位作者 张辉 姜武 徐敏仙 《电力科学与工程》 2006年第3期17-20,共4页
国内外火力发电厂烟风煤粉管道加固肋设计计算方案不尽相同。我国沿袭了前苏联的设计计算方案,经实践证明并不十分合理后,经改良设计,提出了横肋为主,适当考虑内撑杆承受内外荷载,按照薄板大挠度塑性变形计算模式进行板的控制计算。文... 国内外火力发电厂烟风煤粉管道加固肋设计计算方案不尽相同。我国沿袭了前苏联的设计计算方案,经实践证明并不十分合理后,经改良设计,提出了横肋为主,适当考虑内撑杆承受内外荷载,按照薄板大挠度塑性变形计算模式进行板的控制计算。文章通过ANSYS建模模拟烟风煤粉管道的实际情况,用有限元方法校核这种加固肋设计的合理性。 展开更多
关键词 烟风煤粉管道 加固肋 有限元分析
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Study on Lignite-Blended Burning Technology in the 1025t/h Bituminous Boiler
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作者 Jinfeng MA Jingxing WU +2 位作者 Tianshu ZHOU Jie LENG Chong JIANG 《Energy and Power Engineering》 2009年第2期116-121,共6页
Due to a serious shortage of the coal in Tonghua, a retrofit solution of mixing warm flue gas extracted from reversing chamber into the coal pulverizing system and cold air into the hot air coal pulverizing system is ... Due to a serious shortage of the coal in Tonghua, a retrofit solution of mixing warm flue gas extracted from reversing chamber into the coal pulverizing system and cold air into the hot air coal pulverizing system is proposed so as to reduce oxygen content. At the end of the pulverizing system and medium temperature of the conveying system, dual-channel combustion burner is transformed into horizontal bias combustion burner. The measurement results show that 50% ratio of lignite blended in the 1025t/h bituminous boiler is feasibility. It is also an important technology to reduce NOx pollutant emission. 展开更多
关键词 coal pulverizing system BLENDED coal BURNING LIGNITE WARM flue gas explosion prevention drying capacity
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火力发电厂烟风煤粉管道加固肋设计 被引量:1
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作者 郭晓冰 王刚 《机械》 2017年第6期31-34,共4页
根据工程实践经验,经过改良设计,提出了以横向加固肋为主、适当考虑内撑杆承受内外荷载、按照薄板大挠度塑性变形计算模式进行板的控制计算的火力发电厂烟风煤管道设计的计算方法。结合兖矿锅炉项目简要介绍了DL/T 5121-2000《火力发电... 根据工程实践经验,经过改良设计,提出了以横向加固肋为主、适当考虑内撑杆承受内外荷载、按照薄板大挠度塑性变形计算模式进行板的控制计算的火力发电厂烟风煤管道设计的计算方法。结合兖矿锅炉项目简要介绍了DL/T 5121-2000《火力发电厂烟风煤粉管道设计技术规程》中加固肋的计算方法。 展开更多
关键词 烟风煤粉管道 加固肋 内撑杆
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