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循环流化床锅炉改变床存量的燃烧试验 被引量:8
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作者 杨建华 杨海瑞 岳光溪 《动力工程》 CSCD 北大核心 2009年第6期512-515,533,共5页
在1台75t/h循环流化床锅炉上进行了改变床存量的燃烧试验,在3220~7330Pa床层压降变化范围内,测试了改变床存量对锅炉负荷能力、炉内轴向颗粒浓度分布以及实际燃烧效率的影响.结果表明:在远低于常规床层压降的条件下,循环流化床... 在1台75t/h循环流化床锅炉上进行了改变床存量的燃烧试验,在3220~7330Pa床层压降变化范围内,测试了改变床存量对锅炉负荷能力、炉内轴向颗粒浓度分布以及实际燃烧效率的影响.结果表明:在远低于常规床层压降的条件下,循环流化床锅炉仍能保持满负荷运行,而且燃烧得到改善;在适当控制燃料粒度的条件下,循环流化床锅炉降低床层压降运行不仅可行,还可以使锅炉整体运行性能得到优化,是锅炉设计和运行优化的方向. 展开更多
关键词 循环流化锅炉 床存量 锅炉负荷 燃烧反应速率 二次风射流穿透深度
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床存量对循环流化床锅炉启动床料动态平衡的影响 被引量:2
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作者 康晓江 马素霞 郭俊 《山西电力》 2014年第6期60-62,共3页
通过建立物料动态平衡模型,分析床存量对锅炉启动床料粒度分布动态变化的影响。分析程序计算结果表明:在保持良好流态的前提下,静止料层厚度越薄,床存量越少,床料筛选所用的时间越短,锅炉启动越快;分离器性能对不同初始床存量下的床料... 通过建立物料动态平衡模型,分析床存量对锅炉启动床料粒度分布动态变化的影响。分析程序计算结果表明:在保持良好流态的前提下,静止料层厚度越薄,床存量越少,床料筛选所用的时间越短,锅炉启动越快;分离器性能对不同初始床存量下的床料动态平衡的影响比较复杂,需要综合考虑。 展开更多
关键词 循环流化锅炉 料粒度分布 床存量 启动
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循环流化床锅炉对排渣和供风系统的要求 被引量:3
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作者 王进伟 吕俊复 +1 位作者 郑宝忠 岳光溪 《锅炉技术》 北大核心 2006年第1期24-29,共6页
从循环流化床锅炉的工作原理出发,结合百余台实际运行的循环流化床锅炉的实践,分析了锅炉性能对排渣、配风以及燃料、石灰石系统的要求。提出了有效床存量的概念、床压控制的原则、一次风机压头选择的依据。认为风帽阻力是漏渣的根本原... 从循环流化床锅炉的工作原理出发,结合百余台实际运行的循环流化床锅炉的实践,分析了锅炉性能对排渣、配风以及燃料、石灰石系统的要求。提出了有效床存量的概念、床压控制的原则、一次风机压头选择的依据。认为风帽阻力是漏渣的根本原因;在排渣粒度可以保证的条件下,且物料平衡系统对选择性排渣有要求时,尽量采用床下连续排渣、流化床冷渣器;考虑燃料的适应性和运行灵活性,建议送风机流量储备系数宜为1.25,压力储备系数1.3,而引风机的流量储备系数为1.25,压力储备系数1.20;若是燃用生物质等易燃燃料,储备系数还应更大一些。 展开更多
关键词 循环流化锅炉 底渣 床存量 供风 风机
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循环流化床锅炉物料平衡状态的优化研究 被引量:3
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作者 孙美枝 王晓炜 《工业锅炉》 2019年第6期7-11,共5页
设计循环流化床锅炉时,针对锅炉参数、设计煤种存在一个最佳物料平衡状态点。在该状态点下,锅炉能够高效、经济地运行。用最小有效床存量、最小无效床存量、最优床压降等概念,阐述了最佳物料平衡状态点的定义,并分析了影响物料平衡状态... 设计循环流化床锅炉时,针对锅炉参数、设计煤种存在一个最佳物料平衡状态点。在该状态点下,锅炉能够高效、经济地运行。用最小有效床存量、最小无效床存量、最优床压降等概念,阐述了最佳物料平衡状态点的定义,并分析了影响物料平衡状态的一些因素,从工程角度给出了物料平衡状态优化的方法。 展开更多
关键词 循环流化锅炉 物料平衡 有效床存量 压降 燃煤成灰特性
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基于流态重构的循环流化床锅炉节能燃烧技术的应用实践 被引量:19
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作者 苏建民 《动力工程学报》 CAS CSCD 北大核心 2011年第3期170-175,共6页
针对循环流化床锅炉辅机电耗普遍偏高的问题,先后在燃烧劣质无烟煤的135 MW机组和300 MW机组循环流化床锅炉上进行了降低床料存量实现流态重构的燃烧试验,分析了基于流态重构的循环流化床锅炉节能燃烧技术对改善锅炉机组性能的影响.运... 针对循环流化床锅炉辅机电耗普遍偏高的问题,先后在燃烧劣质无烟煤的135 MW机组和300 MW机组循环流化床锅炉上进行了降低床料存量实现流态重构的燃烧试验,分析了基于流态重构的循环流化床锅炉节能燃烧技术对改善锅炉机组性能的影响.运行实践表明:流态重构后,循环流化床锅炉辅机电耗明显下降,在风机具备变频条件下电耗可降低更多;135 MW机组锅炉运行厂用电率从8.2%降低为6.9%,300 MW机组锅炉厂用电率约为4.3%,锅炉主要受热面的磨损明显减轻,飞灰可燃物含量降低3%~5%. 展开更多
关键词 循环流化锅炉 流态重构 存量 燃烧技术 节能
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Hepatocellular carcinoma in extremely elderly patients:An analysis of clinical characteristics,prognosis and patient survival 被引量:7
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作者 Gengo Tsukioka Satoru Kakizaki +17 位作者 Naondo Sohara Ken Sato Hitoshi Takagi Hirotaka Arai Takehiko Abe Mitsuo Toyoda Kenji Katakai Akira Kojima Yuichi Yamazaki Toshiyuki Otsuka Yutaka Matsuzaki Fujio Makita Daisuke Kanda Katsuhiko Horiuchi Tetsuya Hamada Mieko Kaneko Hideyuki Suzuki Masatomo Mori 《World Journal of Gastroenterology》 SCIE CAS CSCD 2006年第1期48-53,共6页
AIM: To identify the clinical and prognostic features of patients with hepatocellular carcinoma (HCC) aged 80 years or more. METHODS: A total of 1310 patients with HCC were included in this study. Ninety-one patie... AIM: To identify the clinical and prognostic features of patients with hepatocellular carcinoma (HCC) aged 80 years or more. METHODS: A total of 1310 patients with HCC were included in this study. Ninety-one patients aged 80 years or more at the time of diagnosis of HCC were defined as the extremely elderly group. Two hundred and thirty-four patients aged 〉/ 50 years but less than 60 years were regarded as the non-elderly group. RESULTS: The sex ratio (male to female) was significantly lower in the extremely elderly group (0.90:1) than in the non-elderly group (3.9:1, P〈 0.001). The positive rate for HBsAg was significantly lower in the extremely elderly group and the proportion of patients negative for HBsAg and HCVAb obviously increased in the extremely elderly group (P〈 0.001). There were no significant differences in the following parameters: diameter and number of tumors, Child-Pugh grading, tumor staging, presence of portal thrombosis or ascites, and positive rate for HCVAb. Extremely elderly patients did not often receive surgical treatment (P 〈 0.001) and they were more likely to receive conservative treatment (P〈 0.01). There were no significant differences in survival curves based on the Kaplan-Meier methods in comparison with the overall patients between the two groups. However, the survival curves were significantly worse in the extremely elderly patients with stage Ⅰ/Ⅱ, stage Ⅰ/Ⅱ and Child-Pugh grade A cirrhosis in comparison with the non-elderly group. The causes of death did not differ among the patients, and most cases died of liverrelated diseases even in the extremely elderly patients. CONCLUSION: In the patients with good liver functions and good performance status, aggressive treatment for HCC might improve the survival rate, even in extremely elderly patients. 展开更多
关键词 Hepatocellular carcinoma Extremely elderly patients Survival analysis Cause of death
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Clinical features of coronary artery ectasia in the elderly 被引量:2
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作者 Qiao-Juan HUANG Yan ZHANG +7 位作者 Xiao-Lin LI Sha LI Yuan-Lin GUO Cheng-Gang ZHU Rui-Xia XU Li-Xin JIANG Meng-Hua CHEN Jian-Jun LI 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2014年第3期185-191,共7页
Objective To investigate the incidence, imaging and clinical characteristics in elderly patients with coronary artery ectasia (CAE). Methods A retrospective analysis was conducted on patients with CAE who underwent ... Objective To investigate the incidence, imaging and clinical characteristics in elderly patients with coronary artery ectasia (CAE). Methods A retrospective analysis was conducted on patients with CAE who underwent coronary angiography between January 2006 and December 2012. According to age, the enrolled patients were divided into two groups (elderly group, age≥ 65 years; non-elderly group, age 〈 65 years). The clinical feature, imaging characteristics and the 5-year survival rate of the two groups were compared.Results The preva-lence of CAE in elderly patients was 0.33%. Patients in elderly group were found to have significantly higher proportion of female (30.1%vs. 10.1%,P〈 0.001), three-vessel disease (60.5%vs. 45.2%,P = 0.003) and localized ectasia (55.0%vs. 40.2%,P = 0.003). In addition, body mass index (20.90 ± 2.71 kg/m2vs. 22.31 ± 2.98 kg/m2,P 〈 0.001) and percentage of current smokers (45.0%vs. 64.6%,P 〈 0.001) were significantly lower in elderly group. Cumulative survival curves demonstrated reduced 5-year cumulative survival at the follow-up in the elderly group compared with the non-elderly group (88.0%vs. 96.0%,P = 0.002). But the 5-year event free survival rate failed to show a significant difference between the two groups (31.0%vs. 35.0%,P= 0.311).ConclusionThe prevalence of CAE in elderly patients was 0.33%, which was about 1/3 of the entire numbers of CAE patients. There were significant differences between the elderly and the non-elderly patients with CAE in terms of coronary artery disease risk factors and coronary artery ectatic characteristics. CAE might be asso-ciated with increased mortality risk in the elderly. 展开更多
关键词 Coronary artery ectasia Elderly patients Clinical feature
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