共查询到17条相似文献,搜索用时 265 毫秒
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在连续催化重整过程中,贵金属催化剂因磨损会产生粉尘。收集粉尘既保护下游设备,又具有经济效益。烧结金属过滤器具有可靠、高效的过滤性能,已在连续重整催化剂除尘领域得到了广泛的应用。针对烧结金属过滤器在线再生不彻底,以及反吹气对工艺系统扰动较大的问题,研究了一定过滤压降增量下,反吹压力及脉冲宽度对过滤器再生效果及系统的影响,确定了烧结金属过滤器在线反吹的适宜操作条件。这对烧结金属过滤器在连续重整工艺中的应用具有一定的指导作用。 相似文献
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操作参数对陶瓷过滤管脉冲反吹清灰过程的影响 总被引:6,自引:0,他引:6
在由单根陶瓷过滤管组成的实验装置上,利用U形管压差计及压阻式压力传感器分别测定了过滤含粉煤灰气体时滤管内外压差和脉冲反吹时滤管内的瞬态压力. 结果表明,在进入连续稳定循环过程后,单根滤管在各个循环的清灰效率仍存在较大的波动.在过滤参数不变而仅改变反吹参数的情况下,可依据反吹压力波形正压峰值来判断清灰效率的优劣. 同时分析了重要操作参数对反吹压力波形及清灰效率的影响. 指出脉冲宽度对清灰效率几乎没有影响;在满足清灰要求的前提下,再提高反吹压力对清灰并没有明显的改善效果;而过高的过滤速度对清灰效率极为不利,会导致过滤循环操作无法正常进行. 相似文献
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利用高频动态压力传感器测定脉冲反吹系统中各位置的压力特性,研究了反吹压力和喷嘴孔径对压力特性的影响,提出了解决反吹不均匀的设计方案,采用过滤循环实验进行验证. 结果表明,采用相同孔径的喷嘴时,喷吹管内、喷嘴出口及过滤管内的压力特性存在较大差异,各喷嘴的反吹不均匀性随反吹压力升高而增大,反吹强度随喷嘴孔径增大而减小,喷吹管内的静压沿喷吹方向逐渐增大. 沿喷吹方向将喷嘴孔径递减能改善反吹不均匀的状况,喷嘴截面积与喷吹管截面积之比s/S对脉冲反吹均匀性的影响较大,s/S=48%~55%较佳. 相似文献
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高温除尘过滤材料的研究 总被引:9,自引:0,他引:9
在现代工业生产过程中,涉及含尘气体在高温下直接净化除尘和应用的领域十分广泛,包括能源工业、石化和化工工业、冶金工业、玻璃工业以及环保领域等。高温工业气体含有大量的物理热、化学潜热及可利用的物质,如固体催化剂,它的合理利用有十分巨大的经济价值。高温气体除尘技术的核心是高性能过滤材料。文章介绍了当前高温气体除尘用过滤材料的特点以及过滤材料国内外研究现状和发展趋势。 相似文献
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Binlin Dou Chao Wang Haisheng Chen Yongchen Song Baozheng Xie Yujie Xu Chunqing Tan 《Chemical Engineering Research and Design》2012
The present review paper highlighted on the recent progress of hot gas filtration, desulphurization and HCl removal in coal-derived fuel gas for combined cycle power generation (IGCC) or molten carbonate fuel cells (MCFC) technologies. As a critical process in the gasification system, hot gas filtration in the particulate control device (PCD) was introduced with enhanced understanding of equipment and operation, filter element and failsafe material properties, and gasification ash characteristics. The issues associated with the commercialization of hot gas filtration were also addressed, and some novel systems and methods were also discussed. The hot gas desulphurization in coal-derived fuel gas has concentrated on developing regenerable sorbents including the single and composite oxides of Zn, Fe, Cu, Mn and other species, and the reduction of metal oxides in the highly reducing atmosphere followed by vaporization of elements can be a problem for reactivity and regeneration. With regard to the removal of HCl, the studies have indicated sorbents prepared by pelletizing the powders of naturally available alkali metal and alkali earth metal substances can rapidly react with HCl vapor and reduce the HCl vapor concentration to less than 1 ppmv, and some sorbents lab-made have very high chlorine capacity. The sorbents based hot gas cleaning also has some challenges. Kinetics studies showed that unreacted shrinking core (USC) can be applied to the modeling of H2S and HCl removal by sorbents at high temperature, and the surface chemical reaction and reactant diffusion by product layers between solid sorbents and gases were very important mechanisms. The paper also proposed and discussed a rational concept for the simultaneous removal of multiple contaminants including ash, H2S and HCl, which will offer a possible cost reduction by two or more processes in a single vessel for hot gas cleaning. 相似文献
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《Powder Technology》2001,114(1-3):129-135
The effects of the nozzle size and its shape for the pulse cleaning of a ceramic filter candle were observed experimentally in the hot and cold bench units using commercial filter elements. The traces of the transient pressure, temperature, and overpressure in the filter cavity were measured to estimate the pulse cleaning effects. At the given pulse cleaning system, the pulse cleaning was optimized by the reciprocal effect of the nozzle size, which increases the primary pulse gas mass and reduces the secondary pulse mass as its size increases. The convergent nozzle showed a higher pulse effect than the straight one due to its concentrating effect, which leads to high pressure of the gas leaving the pulse nozzle. 相似文献
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料浆法粉状磷酸-铵装置干燥尾气处理系统的改进 总被引:1,自引:0,他引:1
将料浆法粉状磷酸一铵装置干燥尾气处理系统由沉降除尘加喷淋洗涤流程政为文丘里酸洗后除沫加文丘里水洗后除沫流程,消除了沉降室的清理时间,提高了装置的运行效率和除尘洗涤效率,使排放尾气中尘、氨、氟含量大大低于国家排放标准,年创效益约1300万元。 相似文献
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在催化裂化装置中再生器底部通常设置有树枝状管式气体分布器,通过分布器上的喷嘴分布气体。但在实际运行过程中喷嘴常出现布气不均和磨损问题,影响其自身的布气性能和使用寿命。为此,在二维床实验装置上针对喷嘴的射流特性进行了实验研究。实验物料为FCC催化剂颗粒,喷嘴出口气速范围为30~70 m·s-1,喷嘴喷射角度范围为0°~67.5°。实验用摄影观察法测量喷嘴射流的射流长度和附近的流场流态。实验结果表明射流长度随喷嘴气速和喷射角度的增大而变长。射流气体在向上翻转过程中,在树枝状管式气体分布器两分支管之间产生旋转涡流现象,旋转涡流的大小与喷嘴出口气速和安装角度有密切关系。最后基于实验数据,建立了喷嘴射流长度的计算模型。 相似文献