共查询到20条相似文献,搜索用时 125 毫秒
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臧新民 《全国煤气化技术通讯》2009,(5):26-27
多喷嘴对置式气化炉的炉顶封堵砖——炉口塞严重制约着气化炉的长周期运行,我们通过设计优化提高了炉口塞的寿命,解决了制约气化炉运行周期的问题。 相似文献
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航天炉渣口压差高制约着气化炉的安全运行。介绍了航天炉的结构及工作原理,阐述了渣口压差高的表现及对气化炉的影响,分析了气化炉操作温度偏低、煤质变化、渣口盘管损坏、烧嘴设计制作不合理、烧嘴通道堵塞等造成渣口压差高的原因,并给出了相应的解决措施和事故预防措施。 相似文献
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《化学工业与工程技术》2017,(3):16-20
Texaco煤气化炉是气化装置的核心设备,其操作控制的首要原则就是保证气化炉的顺畅排渣。分析了Texaco水煤浆气化的反应机理,探讨了Texaco煤气化炉堵渣对气化工艺运行的影响,从熔渣黏温特性、气化炉操作温度、气化炉工艺烧嘴、气化炉激冷环等方面对气化炉堵渣问题的影响因素进行了分析,介绍了对Texaco煤气化炉堵渣问题进行判断的方法,主要包括渣口压差判断法,气体成分组成判断法,以及从锁斗温度振幅、排渣量、煤气化粗渣的残碳含量分析炉温等其他辅助判断法。根据某Texaco煤气化装置的实际运行经验,提出了控制原料煤质、控制适宜的操作温度、加强工艺烧嘴的运行管理、延长激冷环的使用寿命等预防措施,对气化炉堵渣进行预防,并结合实际情况介绍了Texaco煤气化炉堵渣后的应急处理方法。 相似文献
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从原料煤性质、工艺操作、工艺烧嘴、水质等角度分析了影响水煤浆气化炉单炉长周期运行的因素。提出了延长水煤浆气化炉单炉长周期运行的措施。 相似文献
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BGL气化炉采用固定床加压气化、液态排渣技术。经过公司多年运行经验,目前鼓风口的运行周期已成为影响BGL气化炉能否实现长周期稳定运行的关键因素之一。通过对鼓风口长周期运行的影响因素、优化控制以及泄漏后的维护进行总结,以达到BGL气化炉长周期稳定运行的目的。 相似文献
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通过对下降管内温度分布、气化炉内反应机理等方面分析,发现下降管损伤的原因主要是冷却水量不足、炉内产生振动、投料负荷过大或投料液位过高、渣口和下降管挂渣等.根据不同的原因,提出了应对措施,从而延长了气化炉的运行周期. 相似文献
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A mathematical model of the spouted bed gasifier has been constructed based on simplified first order reaction kinetics for the gasification reactions and the stream tube hydrodynamic model of Mathur and Lim. This two region model treats the spout as an isothermal plug flow reactor with cross flow into a series of streamtubes forming the annulus. Each streamtube is considered as a plug flow reactor. The effects of kinetic and hydrodynamic parameters on model predictions are illustrated, and a comparison made with experimental gas composition profiles obtained in a 0.30-m dia. gasifier. 相似文献
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Qinghua Guo Qinfeng Liang Jianjun Ni Shouze Xu Guangsuo Yu Zunhong Yu 《Chemical Engineering and Processing: Process Intensification》2008,47(12):2061-2065
A continuous-time Markov chain has been used to establish the residence time distribution (RTD) model in a new type entrained-flow gasifier, which is called entrained-flow gasifier with opposed multi-burner. According to the measurement results of the flow fields in the gasifier, the state transfer diagram of Markov chain formed in the case of the flow fields are simplified. The results show that this method is feasible in modeling the flow system which consists of ideal mixing cells and plug flow regions. The flow pattern of the gasifier is closed to continuous stirred tank reactor (CSTR). The simulation results are in good agreement with the experimental data. The established model has been applied to forecast the RTD in the industrial gasifier. 相似文献
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德士古气化炉气化过程剖析(Ⅲ)—停留时间分布测试 总被引:1,自引:0,他引:1
介绍7种不同规格容器、6种工况下的停留时间分布测试结果,定性地分析了影响停留时间分布的因素,诸如射流速度、高径比、筒体直径与喷嘴直径比、出口阻力等。研究表明,德士古气化炉基本上趋于全混流,约有50%左右的物料在平均停留时间之前离开炉膛,存在短路,停留时间不足一秒,已见物料逸出炉外。 相似文献
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An inverted cyclone gasifier and secondary cyclone combustor have been developed for use in a biomass fired small-scale cogeneration plant. The gasifier was designed with a vortex collector pocket (VCP) and a central collector pocket (CCP) to maximise particle and ash separation from the flow, and remove alkali and other heavy metal traces that agglomerate with the ash particles. The gasifier design was robust and suitable for firing with varying input conditions. The gasifier exhaust gas is suitable for directly firing into the secondary cyclone combustor without any complex hot gas clean up systems. The cyclone combustor produces a strong swirling flow with good mixing and burnout patterns, creating stable combustion conditions. The use of an additional VCP situated before the combustor exit removes the need for additional cyclone separators. An exhaust mounted tangential off-take on the combustor reduces pressure drop across the system and gives near uniform exhaust velocity profiles. The gasifier achieved 98–99% burnout with good separation/retention rates and 50% alkali, Na and K removal. A good quality low calorific value (LCV) gas was produced that could be effectively utilised in the cyclone combustor. The cyclone combustor produces a stable flow, with good mixing and burnout rates, and uniform exit conditions and could be operated in a lean mode to minimize NOx. The additional use of a VCP removed particles above 5 μm, as specified by turbine inlet conditions. The gas was suitable for directly firing into the gas turbine. Low pressure drop was found across the system. 相似文献
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根据多喷嘴对置式气化炉流场测试,将气化炉划分为若干区域,运用时间离散、状态离散的马尔可夫链随机模型,模拟了气化炉内颗粒相的停留时间分布(RTD)。当颗粒在撞击区和射流区间的回流比为0.5,向下撞击流股区和管流区为平推流模型,其他区域按全混流模型处理时,模拟值与实验值吻合较好。随着进料流量的增大,平均停留时间减小,量纲1方差减小;随着回流比的增加,平均停留时间增大;气固两相平均停留时间接近,但RTD存在一定差异。 相似文献
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运用Gibbs自由能最小化方法模拟气流床煤气化炉 总被引:23,自引:0,他引:23
基于 Aspen Plus工业系统流程模拟软件 ,运用 Gibbs自由能最小化方法建立了气流床煤气化炉的模型 .研究了气化炉的主要操作参数 (即水煤浆浓度、氧煤比、碳转化率和气化温度 )对气化结果的影响 .对模拟结果进行了分析 ,发现模型基本正确 ,可应用于一些反应机理复杂的气化工艺的化学和热力学平衡计算 .模拟结果表明 ,氧煤比和水煤浆浓度是影响气化炉出口煤气组成的主要因素 ,气化炉温度随着氧煤比的增加而增加 ,也随着水煤浆浓度的增加而增加 .结果还表明 ,氧煤比对气化结果的影响比水煤浆浓度的影响更为显著 相似文献
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化学热回收两段组合式气化炉有效地提高了高温合成气的显热回收。为进一步了解该新型两段炉内气体的流动规律,在自行搭建的冷模实验装置上,考察了该组合式两段炉内的二段床层压降以及速度分布情况。研究表明,采用Montiller经验公式能够准确预测二段固定床的床层压降,当气体达到二段床层表面时,将产生一个冲击区。拟合得到单喷嘴顶喷的轴向速度衰减公式以及四喷嘴撞击后的向下径向射流速度衰减公式。轴向速度的径向分布中,中心气速最大并且衰减最快,采用四喷嘴对喷的形式达到管流区所需的轴向距离较单喷嘴顶喷小1.8D。 相似文献
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描述了煤气化炉在运行过程中,因内衬耐火层损坏导致炉顶烧损,通过对顶部封头材料进行无损检测、金相检查、硬度测试等确定了具体烧损范围,由此制定了通过加大顶部法兰底部直径进行更换的修理方案并实施,使设备恢复了正常运行. 相似文献