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联合循环中的余热锅炉 总被引:9,自引:0,他引:9
燃气轮机的联合循环充分考虑了能量的品位,具有很高的联合效率。余热锅炉作为广泛的余热回收装置,处于燃气轮机和下游设备之间,起着承上启下的作用。本文基于相关的研究成果,对余热锅炉进行了探讨。 相似文献
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介绍火法锌冶炼焦结炉余热锅炉的积灰部位,并分析积灰的成因。简述燃气脉冲吹灰装置的作用机理,总结了燃气脉冲吹灰装置在焦结炉余热锅炉上的应用效果。 相似文献
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1前言目前,城市宾馆、酒店及商住楼宇的供热设备越来越多地采用燃油锅炉。锅炉房除了满足客房的热水供应和采暖之外,同时对洗衣房、厨房、员工食堂和浴室等附属用房提供适温热水。在供热高峰期,锅炉往往处在长时间的满负荷状态,而多数宾馆、酒店在保障锅炉正常供热的情况下,很少用回收余热的方式来节约燃料,尽管可以安装与燃油锅炉相匹配的余热器,但由于各种原因未能采取回收余热的措施。燃油锅炉的运行和传热机理与燃煤锅炉大致相仿,所不同的是燃油锅炉烟气的含尘量较低,有利于在锅炉尾端布置回收余热的装置。2回收烟气余热的可行… 相似文献
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结合转底炉余热锅炉设计和运行过程中出现的实际问题,就转底炉余热锅炉的烟尘特性、锅炉结构设计要点进行了阐述,并对锅炉受热面振打装置的选型进行技术探讨。 相似文献
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铜冶炼厂余热锅炉的工作条件较为恶劣,侧重于防止积灰而常选用直通式余热锅炉。该文对余热锅炉所采用的循环方式作了比较,介绍其蒸汽参数、烟气露点、排烟温度等热力参数的确定方法,提出了余热锅炉的辐射冷却室、对流受热面、灰斗、清灰装置及钢筒等主要部件的设计事项。并给出一典型铜冶炼厂的烟气条件及余热锅炉的主要技术参数。 相似文献
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Chun-Lang Yeh 《International Journal of Heat and Mass Transfer》2012,55(13-14):3601-3617
We present a numerical investigation of the heat transfer and fluid flow in a Carbon Monoxide (CO) boiler. The influences of some important parameters related to the geometry of a CO boiler are also discussed, including the refractory thickness and the insertion of an ellipsoidal cone. The purpose is to improve the performance of a CO boiler, especially to alleviate hot spots, which may lead to deterioration of the refractory. It is found that the skin friction coefficient arises earlier in the DeNOx section when the refractory is thinner. Refractory thickening leads to a lower temperature in the DeNOx section. After leaving the DeNOx section, the temperature reduces due to the cooling pipes and the skin friction coefficient arises abruptly near the cooling pipes. It is also found that insertion of an ellipsoidal cone can lower the temperature in the DeNOx section and there is a larger skin friction coefficient with a larger ellipsoidal cone angle. After leaving the DeNOx section, the skin friction coefficient and the temperature both decrease. Finally, based on the result of this research and from a practical point of view, refractory thickening is a preferable choice for reducing friction, pressure drop and temperature in a CO boiler. 相似文献
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为了响应政府业及民用天然气锅炉达到超低氮排放,要求绝大多数天然气锅炉采用低氮燃烧器+烟气再循环系统的技术路线,实施后普遍出现NOx、CO含量偏高、炉膛振动较大等问题。借助116 MW天然气锅炉进行试验研究,研究了燃烧器燃料配比、燃烧火焰长度、助燃空气氧含量三个因素对NOx及CO的影响,并对投入烟气再循环前后炉膛振动情况进行了检测。试验表明:燃烧器燃料内外配比对NOx、CO生成影响较大,两者呈现相反趋势变化;燃烧火焰长度对NOx生成影响较大,对CO含量影响较小;助燃空气氧含量对NOx、CO生成以及锅炉振动影响较大。三种影响因素相比,助燃空气氧含量影响更为突出。 相似文献
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在燃煤电厂利用生物质再燃还原氮氧化物 总被引:1,自引:0,他引:1
生物质能是一种可再生的清洁能源,利用生物质能基本可以实现CO2的零排放。目前最有效的生物质能利用方式就是将生物质按照一定的比例在电站燃煤锅炉中与煤混燃。另外,电站燃煤锅炉排放的烟气中含有大量的氮氧化物(NOx),对环境危害极大。把生物质作为电站燃煤锅炉再燃燃料来还原氮氧化物(NOx),既可高效利用生物质能,又可以降低污染物(CO2、NOx等)的排放,具有显著的社会效益。 相似文献
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This paper presents results from an experimental study performed on a 13 kWth commercial domestic boiler using pellets as fuel. Four different types of pellets were used and, for each one, the boiler was tested as a function of its capacity and the fan regulation affecting excess air. Measurements were performed for boiler heat load, pellets consumption rate, flue-gas temperature and composition. Mass balances allowed the calculation of the flue-gas flow rate and associated heat losses. Losses from incomplete combustion have also been quantified. Under boiler steady-state conditions the flue-gas O2 concentration changes with boiler load and ventilation due to the regulation scheme of the boiler. Flue-gas CO shows a minimum for values of O2 in the flue-gases of about 13%. NOx emissions are independent of excess air for low values of nitrogen in the fuel whereas, for larger values, NOx emissions increase with the O2 present in the combustion products. The fractional conversion of the pellets nitrogen into NOx is in line with literature data. The boiler start-up was characterised by the temperature evolution inside and above the bed showing the propagation of combustion in the bed during about 10 min. During boiler start-up, a maximum in CO emissions was observed which is associated with the maximum combustion intensity, as typified by the flue-gas O2 concentration and temperature, regardless the pellets type. 相似文献
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在介绍塔式炉在我国迅速崛起的背景的基础上,详细分析了塔式炉的特点和调试技术,并提出了发展和优化塔式炉设计和运行的建议,以供基建调试单位和电厂运行借鉴。 相似文献
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介绍了分层燃烧技术在正转链条锅炉炉前自成型装置中应用的结构原理,分析其燃烧过程,更好地解决目前单一的炉前自成型技术中出现的问题,进一步探讨炉前自成型技术的发展。 相似文献
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本文简单介绍了为某电厂设计和制造的130吨燃烧生物质燃料锅炉的整体布置。该锅炉利用可再生能源作为燃料,比常规的燃煤锅炉更环保和节能,并能实现CO2零排放。 相似文献
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湿法脱硫(WFGD)工艺以石灰石作为吸收剂,制成石灰石浆液与烟气中的二氧化硫反应,生成的副产品为石膏。针对石膏—石灰石湿法脱硫对电站温室气体排放计算模型影响的问题,在燃烧方程的基础上重新建立计算模型。通过新的计算模型对采用石膏—石灰石湿法脱硫的燃煤电站锅炉CO2排放量进行计算分析。结果表明:新的计算模型适用于该电站锅炉CO2排放量的计算。由新的计算模型看出采用石膏—石灰石WFGD的燃煤电站锅炉要比采用干法脱硫的电站锅炉要多排放2(1-η)SO2的CO2,式中的η为烟气脱硫效率。针对该电厂锅炉进行计算,在机组负荷100%的情况下,二氧化碳每小时将多排放8.41t。 相似文献