共查询到19条相似文献,搜索用时 109 毫秒
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通过对高炉煤气燃料成分和热值的分析,说明高炉煤气锅炉的排烟热损失很大,直接影响锅炉的热效率。结合给水温度的影响,说明高炉煤气锅炉的热效率不可能很高,并给出了一个合理的范围,同时指出要提高热效率则必须配套其他的辅助设备。 相似文献
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锅炉的主要辅助设备之一的风机出力偏小是影响锅炉负荷、燃料燃烧以及整个机组负荷的重要因素之一.而在锅炉设计过程中,如何正确地计算出烟民道中各种烟空气阻力是选择合适风机的前提,也是锅炉设计计算的重要参数.本文计算借鉴国外成熟的设计技术,结合几年来的工作实践,提出锅炉制粉系统磨煤机出口后煤粉管道系统设计中的阻力计算方法和煤粉管道尺寸的选择. 相似文献
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基于流化床的生物质燃烧技术应用日益广泛.生物质燃料流化床的缺点是容易产生床体结焦.灰的组分和生物质燃料中的硫、氯是影响流化床锅炉烧结倾向、锅炉污染速率、灰沉积过程、结焦和过热器腐蚀的主要因素.以灰成分为基础划分生物质燃料,可分为具有显著的不同燃烧特性的3类.在实践的基础上,阐述了各类生物质燃料及其灰分特性,以及在流化床... 相似文献
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以常规锅炉燃料燃烧计算方法为基础,对富氧燃烧锅炉的燃料燃烧计算方法展开研究。通过将富氧锅炉与常规锅炉的热力系统进行比较,建立了进行富氧锅炉燃料燃烧计算的基本模型。在此基础上首先提出了富氧燃烧条件下燃料所需理论助燃剂量和理论烟气量的计算方法,随后进行了考虑烟气再循环和不考虑烟气再循环2种条件下的实际烟气量的分析计算,其中包括各种烟气成分的体积量的计算,最后根据富氧燃烧锅炉热力系统的特点,推导出了富氧燃烧条件下烟气质量、烟气密度、飞灰质量浓度和烟气焓的计算公式。对富氧燃烧条件下锅炉的燃料燃烧计算进行了详细分析,为今后发展和完善富氧锅炉热力计算方法提供必要的理论基础。 相似文献
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锅炉燃烧调整对NOx排放和锅炉效率影响的试验研究 总被引:7,自引:0,他引:7
在2台典型的1025 t/h锅炉上进行了燃烧调整降低NOx排放浓度的试验研究,通过改变过量空气系数、辅助风配风方式、运行负荷和制粉系统运行方式等,测定了锅炉尾部烟道NOx排放浓度,分析了锅炉运行工况、运行方式对NOx排放的影响.结果表明:降低过量空气系数,烟煤锅炉NOx减排效果比贫煤锅炉好得多;降低负荷,烟煤锅炉的NOx排放量降低值较大;缩腰式配风的NOx排放浓度比均匀配风方式约降低10%,制粉系统的运行方式影响炉内燃料的燃烧状态和温度分布,也影响NOx的生成和排放.在不降低锅炉效率的前提下,调整燃烧工况,可降低锅炉排放NOx浓度1O%~20%. 相似文献
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垃圾焚烧炉及垃圾电厂热力系统设计中的几个问题 总被引:2,自引:1,他引:1
本文针对垃圾燃料水分高,热值低,热值不稳定,成分复杂等特点,分析了垃圾锅炉的供风方式、垃圾锅炉的高低温腐蚀以及垃圾电厂的热力系统。 相似文献
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生物质颗粒燃料取代常规煤燃料对节约常规能源、优化我国能源结构、减轻环境污染具有积极的意义。生物质颗粒燃料与常规煤燃料的特性有较大的区别。当将燃煤锅炉改造为燃生物质颗粒燃料锅炉时应采取相应的改造措施。以本公司锅炉为实例对燃煤链条锅炉的炉膛和燃烧系统进行了改造,通过对炉拱、炉排、风室、卫燃带、上料系统、燃烧控制系统进行改造实现了锅炉与生物质颗粒燃料燃烧的良好匹配。能效和环保测试结果表明,锅炉改燃生物质颗粒燃料后热效率提高,污染物排放符合标准要求。 相似文献
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Vincenzo Liso Yingru Zhao Nigel Brandon Mads Pagh Nielsen Søren Knudsen Kær 《International Journal of Hydrogen Energy》2011,36(21):13715-13726
In this paper, the ability of a micro combined heat and power (mCHP) system to cover the heat and electricity demand of a single-family residence is investigated. A solid oxide fuel cell based mCHP system coupled with a hot water storage tank is analyzed. The energy profiles of single-family households in different European countries are evaluated. The range of Heat-to-Power Ratio for the SOFC-based mCHP System of 0.5–1.5 shows good agreement with the hot water, space heating and electricity demand during the warm seasons across Europe. This suggests that the fuel cell system should be sized according to the summer energy demand. The winter energy demand shows a Heat-to-Power Ratio which cannot be covered by the mCHP unit alone. To ensure that the mCHP system meets both the thermal and electrical energy demand over the entire year, an auxiliary boiler and a hot water storage tank need to be coupled with the mCHP unit. It is further noted that the size of the auxiliary boiler should match the larger winter space heating demand. In contrast, the hot water tank volume should be sized according to the warm season space heating requirement, when space heating is not required but electricity and hot water are still in demand. This maximizes the running time of the fuel cell, and thus the economic and environmental benefit of the system, without wasting produced heat. 相似文献
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介绍了我国投运的首台采用再热蒸汽短路调温技术的745t/h循环流化床锅炉的设计与运行情况,并探讨了锅炉运行条件对减排NOx和SO2的影响.由性能测试结果可知,过热器、再热器、旋风分离器和空气预热器设计合理;再热蒸汽短路调温技术能够满足再热器调温要求;在机组带220MW电负荷稳定运行时,锅炉热效率平均试验值和平均修正值分别为90.72%和90.56%;锅炉完全具备最大连续出力745t/h和最低不投油稳燃出力连续运行的能力;锅炉合理运行时可以有效降低NOx和SO2的排放. 相似文献
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When wood chips are available and used to fuel a combined cooling, heating, and power (CCHP) waste heat recovery system, they can represent an economically viable source of biomass energy that can meet a facility's electric and thermal demands. Using a Stirling engine as the CCHP prime mover provides several important advantages over conventional internal combustion engines including no additional processing of the waste wood chips, a potentially higher thermal efficiency, flexibility of fuel sources, and low maintenance. This study shows how the operational characteristics of a constant output, biomass‐fired, Stirling engine‐based CCHP system are affected by the performance of the individual components, including the prime mover, heat recovery system, auxiliary boiler, absorption chiller, and heating coil unit The results are assessed by examining the primary energy consumption and operational cost compared with a reference case. The analysis provides insight on the prime mover sizing and selection of each component to properly implement the system. In addition to examining the effects of each component, the effect of excess electricity production and buyback are considered. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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In this paper a modelling and simulation of an absorption solar cooling system is presented. The system is modelled with the TRNSYS simulation program and the typical meteorological year file containing the weather parameters of Nicosia, Cyprus. Initially a system optimisation is carried out in order to select the appropriate type of collector, the optimum size of storage tank, the optimum collector slope and area, and the optimum thermostat setting of the auxiliary boiler. The final optimised system consists of a 15-m2 compound parabolic collector tilted 30° from the horizontal and a 600-l hot water storage tank. The collector area is determined by performing the life cycle analysis of the system. The optimum solar system selected gives life cycle savings of C£1376 when a nonsubsidized fuel cost is considered. The system operates with maximum performance when the auxiliary boiler thermostat is set at 87°C. The system long-term integrated performance shows that 84,240 MJ required for cooling and 41,263 MJ for hot water production are supplied with solar energy. 相似文献
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为节约能源,研制了HD-B & WSL35MC型船用柴油机的燃油废气锅炉。对新设计的锅炉进行了炉胆结构强度摸拟试验,传热,阻力热风洞摸拟试验,平台试验和陆上鉴定试验。此组合辅锅炉具有占地小、费用省、管理方便等优点。年节油可达500吨。该炉已装于5000吨级客货轮上使用,亦可做工业锅炉用于油田及宾馆。 相似文献
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王乐华 《中国锅炉压力容器安全》2009,(7):52-55
现役循环流化床锅炉汽轮发电机组厂用电率高达10%~13%.明显地抵消了循环流化床锅炉燃烧效率高、排放污染低、煤种适应性强等诸多优势,厂用电率高的问题已成为制约循环流化床锅炉大型化快速发展的瓶颈.其中锅炉辅机的耗电率占了很大的比例,是降低机组厂用电率的主攻方向,本文针对广东梅县发电厂三期5、6号循环流化床锅炉从运行调整、辅机系统改造等方面提出了降低循环流化床锅炉机组厂用电率的各项措施进行了分析.使循环流化床锅炉发电机组的厂用电率降到接近同类型煤粉炉发电机组的程度。 相似文献
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针对目前石油仓储企业需要利用燃油锅炉产生蒸汽,对高凝点、高粘度油品进行保温的现状,通过分析燃油锅炉的热力系统,提出通过提升进入除氧器补充水的水温,从而减少热力除氧器消耗的蒸汽量以达到减少燃料油消耗量的思路。介绍热泵系统的特点和优势及其与燃油锅炉联合供热的方案,并通过实例阐明热泵与燃油锅炉联合供热的经济效益。 相似文献