循环流化床锅炉返料量减少的问题处理及对策

循环流化床锅炉系统改造后，出现返料风压突然降低以及返料器中基本没有返料的现象，经反复调整仍无效果。停车检修后，对返料风机选型、物料分离系统和返料装置进行了细致排查，发现是由于返料器风帽用错及脱落过多而引起。最后，对循环流化床锅炉分离返料常见的故障进行了简单分析。     

YG-75/5.29-M18型燃煤泥循环流化床锅炉的特点及应用

介绍了燃煤泥循环流化床锅炉在输送系统、喷枪结构、给料方式及分离器等方面的技术特点;论述了燃烧煤泥时对流化床温度、返料器温度、料层差压、炉膛差压和锅炉负荷等参数的控制与调整;应用此锅炉燃用煤泥或矸石,可降低生产成本,获得较好的经济效益。     

循环流化床锅炉返料器返料异常的分析及处理

针对循环流化床锅炉返料器返料时出现的异常现象,分析原因并采取措施,有效解决问题,恢复了返料系统的正常运行,为锅炉的长周期安全运行提供保证。     

流化床返料器控制与调节

非机械阀已经广泛应用于循环流化床锅炉完成固体颗粒从低压区向高压区的传输且具有压力密封作用。本文详细介绍了一种新型流化床返料器,通过试验结果分析表明,该流化床返烊器具有良好的物料循环量的控制与调节性能。     

循环流化床锅炉密封返料装置输送特性及故障分析

探讨了流化风量，松动风量和狭缝高度对流化密封返料器工作性能的影响，分析返料器常见故障的原因，并以广西某化肥厂25t/h循环流化床锅炉为例，提出了相应的解决措施。     

浅析循环流化床锅炉的经济运行

1前言循环流化床锅炉是一种其燃烧方式介于层状燃烧与悬浮燃烧之间的新型燃烧设备。燃料在炉内像沸腾的开水一样,呈沸腾状。为了提高锅炉效率设计了一次返料及二次返料,循环流化因而得名。了解循环流化床锅炉的优缺点及其对效率的影响,并有针对性地进行技术改造,对提高运行经济     

循环流化床锅炉后部燃烧的预防措施

循环流化床锅炉由于煤种适应性广,负荷调节性能好,高效节能而得以推广应用,尤其是以煤为原料的氮肥企业,将造气炉渣、无烟煤末与烟煤混合作为流化床锅炉的燃料,既解决了造气炉渣的处理问题,又能节约大量燃料,经济环保效益特别明显.但由于设计、安装及操作不当等多方面的原因,往往在运行中出现后部燃烧,致使锅炉床温及返料温度升高,轻者造成锅炉出力不足,热效率偏低,严重者可能造成返料器超温结焦,从而造成不必要的停炉损失.     

循环流化床锅炉节能增效改造总结

<正>0前言山东阳煤恒通化工股份有限公司热电厂现有2台高温高压、自然循环流化床锅炉,额定蒸发量240t/h,额定蒸汽压力9.8 MPa,额定蒸汽温度540℃,设计给水温度215℃,排烟温度140℃,热效率86.0%~90.5%。锅炉炉膛为膜式水冷壁结构,截面尺寸5 280mm×10 240mm,由膜式水冷壁、高温旋风分离器、返料器、流化床组成循环燃烧系统。过热器分三级布置,分别是低温过热     

240t／h循环流化床锅炉返料中止事故探析

恒通公司目前有5台240t／h循环流化床锅炉（YG-240／9．8-MI），该炉型具有双分离器、双返料器，且左右并列布置于炉膛和尾部竖直对流烟道中间。返料器分松动风室和流化风室，两返料器所有松动风、流化风均来自同一返料风机，经返料风母管送风，返料风机2台（1开1备）。     

UG-35/3.82-M17循环流化床锅炉的改造及效果

对唐家庄热电有限责任公司的UG 35 3 82、M1 7型循环流化床锅炉 ,由于燃料设计不符造成的产汽量不足、主蒸汽温度低以及回料器不能正常返料等问题进行了分析 ;为了适应燃用煤矸石的要求 ,对燃烧系统、回料器及高温过热器等进行了改造 ,经过一年的运行 ,各项技术指标达到了改造设计的要求 ,经济效益显著 ,达到了预期的效果。     

Experimental Investigation into the Hydrodynamics of Flow of Solids through a Loop Seal Recycle Chamber

The working of loop seal is one of the least understood aspects of a circulating fluidized bed boiler although this component is critical to the operation of such boilers. The present work is an experimental study of the flow of solids; through the recycle chamber of a loop seal in a circulating fluidized bed (CFB). The effect of different parameters on the velocity of solid overflow through the recycle chamber is investigated. The sharp‐crested weir theory of free surface water flow was used to analyze the solid flow through the loop seal. The analysis gives a good indication of the validity of the above theory for solids overflow over a weir. The results show that the solid flow rate increases with increase in bed height above the weir and the particle size had no effect on the value of the weir coefficient.     

Solid Recycle Characteristics of Loop‐seals in a Circulating Fluidized Bed

Solid recycle characteristics through a conventional and a newly developed loop‐seal (0.08 m i.d.) system are determined in a circulating fluidized bed of FCC or silica sand particles. In the loop‐seal developed here, gas was injected downward tangentially to the wall of the loop‐seal to increase solids mass flux with stable flow. For conventional loop‐seal, solids mass fluxes increase linearly with increasing aeration rate but it reaches a maximum value. At the same aeration rate with different aeration locations (0.1 – 0.6 m) in a conventional loop‐seal, a maximum solids mass flux is seen at a height to diameter ratio of 2.5. For the newly developed loop‐seal, mass fluxes of FCC and sand particles are higher and more stable than in conventional loop‐seal at the same aeration rate. The solid mass fluxes obtained have been correlated with the aeration rate and Archimedes number.     

Beneficial use of CFB ash in pavement construction applications

The disposal of ash produced from the combustion of solid fuels has been a major subject of research and product development for many years. An innovative application has recently been employed by JEA to recycle both the bottom ash and fly ash from two new circulating fluidized bed (CFB) boilers as a stabilizer for local sandy soils and pavement base course material. The results of laboratory testing and field applications in the north Florida market area illustrate how this by-product is adding value in pavement and roadway construction applications.     

Regulating characteristics of loop seal in a 65 t/h oil shale-fired circulating fluidized bed boiler

In this paper, an industrial cold experiment was conducted for studying regulating characteristics of a loop seal in a 65 t/h oil shale-fired circulating fluidized bed (CFB) boiler. The starting characteristic of the loop seal, and the effect of the supplying air and the fluidizing air in the loop seal were investigated. Compared with other regulating modes, the combined regulating mode of keeping the fluidizing air rate constant and regulating the supplying air rate can make the loop seal obtain better regulating quality, and offer more reliable guarantee for steady operation of the CFB boiler as well. In order to prevent circulating material depositing and slagging at the bottom of the loop seal, it was suggested that the fluidizing air rate and the supplying air rate is 2-3 and 1.2-1.5 times of the minimum fluidizing velocity of circulating material, respectively. These experimental results may be used as a reference for regulating the loop seal of the 65 t/h CFB boiler in hot condition and designing a new loop seal.     

我国燃煤工业锅炉现状及分析

不同类型燃煤工业锅炉具有各自的技术优势及应用范围,为了给用户在项目立项、选择锅炉时提供正确参考,阐述了3种主流燃煤工业锅炉的技术特点、应用现状,并着重针对循环流化床锅炉和现代煤粉工业锅炉,从燃烧组织方式和技术特点两方面进行了系统的技术对比分析。经分析认为,流态化燃烧组织是循环流化床锅炉的技术基础,浓相室燃燃烧组织是现代煤粉工业锅炉的技术基础。依托密相床炉料的巨大热容量,循环流化床锅炉定位于处理高灰劣质燃料;依托低变质高活性清洁煤粉快响应着火喷燃,现代煤粉工业锅炉定位于油(气)锅炉的备份及互换。因此,二者非取舍而是互为补充的关系。     

循环流化床锅炉一体化外置式换热器

大型循环流化床锅炉广泛采用各种形式的外置式换热器。传统的换热器只能实现换热器（EHE）和返料机构（loop seal）之间的物料流量的调节,此时进入EHE的物料将会全部顺次流过各个换热仓室,很难对外置床中的各种受热面的传热量进行单独调节。本文首次提出了一种全新的非机械阀式外置式换热器布置方式,通过控制流入各个换热仓室的固体物料流量,从而达到对各换热仓室中布置的受热面的换热情况进行单独调节。同时把EHE和loop seal结合在一起,保证向炉膛的返料。文中对这种一体化外置式换热器及其返料机构中的物料流动特性进行了冷态试验研究。试验结果表明,这种外置式换热器有很好的物料分流和流量控制特性。可以通过调节运行参数和结构参数来控制两个换热室、EHE和loop seal以及两个返料口之间的物料流量和比例。同时还得到了物料在换热室的流动特性。通过对可见输送分离高度的测量,提出了分配室和换热室相对隔板高度的设计方法。     

油页岩循环床锅炉中温分离回输系统Loop Seal工作特性的研究

在目前世界上投入商业运行最大容量的 65t/h油页岩循环流化床锅炉上 ,进行了全尺寸的中温分离系统中LoopSeal型返料装置的工作特性热态试验 ,得到了油页岩循环流化床燃烧中温分离回输系统中LoopSeal型返料装置的运行参数、温度特性及其循环物料的颗粒特性和含碳量分布 ,试验结果对油页岩循环流化床锅炉的放大设计与运行调节具有一定的参考价值     

煤泥干燥与泵送技术对煤泥燃烧发电的影响

阐述了煤泥干燥脱水与煤泥管道泵送2种煤泥处理技术的优缺点,对比分析2种工艺对煤泥燃烧发电的影响,得出煤泥干燥后与原煤掺混入炉燃烧的处理方式不适用于煤泥综合利用电厂,而煤泥管道泵送技术是发展煤泥燃烧发电的必要环节,且日趋向大容量循环流化床锅炉大比例掺烧煤泥方向发展。     

Cold Flow Model Study of an Oxyfuel Combustion Pilot Plant

The fluid‐dynamic behavior of a circulating fluidized bed pilot plant for oxyfuel combustion was studied in a cold flow model, down‐scaled using Glicksman's criteria. Pressures along the unit and the global circulation rate were used for characterization. The analysis of five operating parameters and their influence on the system was carried out; namely, total solids inventory and the air velocity of primary, secondary, loop seal and support fluidizations. The cold flow model study shows that the reactor design allows stable operation at a wide range of fluidization rates, with results that agree well with previous observations described in the literature.