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气化炉托砖板法兰多次损毁是山东华鲁恒升化工股份有限公司大型氮肥技改项目存在的问题之一。通过对损坏的气化炉进行检查,发现气化炉托砖板法兰内径由780 mm均匀损毁至930 mm,且法兰约1/3圆周长度范围被烧穿。针对此2种现象进行了详细的分析,并从改造气化炉耐火砖、激冷环、托砖板法兰结构,更换激冷环垫片材料,进行严格检修控制和加强工艺管理等几方面对气化炉的改进进行了研究。 相似文献
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针对山东华鲁恒升化工有限公司水煤浆气化炉托砖板内径尺寸变大、径向产生大量裂纹、水平变形等问题,分析了托砖板损坏的原因:①氢致裂纹;②高温腐蚀;③高温冲蚀。采取了打止裂孔、涂抹高温密封胶和高铬浇注料的应急措施,并实施了更换新托砖板,扩大托砖板内径等结构性技改方案。结果表明:开车至今,多次检查托砖板均未发现裂纹、腐蚀和变形。 相似文献
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<正>我公司2010年10月投产的带TTF分解炉的2 500t/d生产线,2011年4月出现分解炉下部大面积耐火砖掉落现象,随即停窑抢修。1原因分析耐火砖掉落、壳体烧红的位置在分解炉下部第二环和第四环砖处(每两个托砖板之间的砖视为同一环),见图1。分析后认为,耐火砖掉落并不是其自身磨损所致,主要原因是:托砖板处的浇注料磨损后掉落,特别是托砖板上部的290mm的浇注料磨损严重,托不住耐火砖造成掉落。个别耐火砖未掉落的部位,托砖板处的浇注料也磨损较重,并露出托砖板,耐火砖已经 相似文献
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介绍了变换工段高温浮头换热器的设计过程。管板按1.0MPa的压差设计;固定管板与设备法兰之间采用Ω环密封;高温段管口均不带法兰与管道采用对焊连接(BW)。 相似文献
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《燃料与化工》2021,(2)
正本实用新型涉及一种外热式低阶粉煤连续干馏炉的炭化室炉顶结构,包括炉顶盖板及设于其上的下料口、集气伞支座、上升管底座和砖煤气道清扫孔;集气伞支座设在炉顶盖板中部,底部伸入炭化室内连接集气伞;集气伞支座两侧分别设有下料口,下料口的底部也伸入炭化室内;炭化室内下料口底沿下方两侧沿炭化室长向分别设砖煤气道,砖煤气道顶部通过炭化室炉顶空间连通上升管,上升管安装在上升管底座上;砖煤气道上方的炉顶盖板上对应设有砖煤气道清扫孔。本实用新型采用炉顶盖板与炭化室炉顶配合安装,并在其上布置工艺孔的方式,在满足炭化室顶部操作工艺条件要求的同时,可保证荒煤气导出速度及温度,避免水蒸汽、焦油、灰尘冷凝堵塞炉顶煤气通道。 相似文献
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介绍了针对高硫煤气化采用的气化炉中脱硫和粗煤气脱硫2种净化方法;探讨了气化炉中加入钙基脱硫剂的脱硫反应机理、脱硫效率及其影响因素;总结了高硫煤制粗煤气采用低温甲醇洗涤法脱硫的技术优势和脱硫效果。 相似文献
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烟煤水煤气气化炉是将双火层煤气发生炉的气化原理用于水煤气气化的一种炉型。介绍了双火层气化炉的炉型规格、供气形式和半水煤气组成;从煤气中CO2和CH4含量、气化炉反应温度、蒸汽量的调整等方面分析了烟煤水煤气气化炉生产运行的可行性;介绍了烟煤水煤气气化炉的结构形式和工艺流程;计算了原料煤成本的经济效益,结果表明,4万t/a合成氨装置每年可节约原料煤费用1160万元,20万t/a甲醇装置每年可节约原料煤费用6960万元。 相似文献
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Hai-Kyung Seo Seik Park Joogwon Lee Miyung Kim Seok-Woo Chung Jae-Hwa Chung Kitae Kim 《Korean Journal of Chemical Engineering》2011,28(9):1851-1858
The effects of operating factors on a gasification system were reviewed by comparing a computational simulation and real operation results. Notable operation conditions include a conveying gas/coal ratio of 0.44, an oxygen/coal ratio of 0.715, a reaction temperature of 1,000 °C, and reaction pressure of 5bar in the case of Adaro coal; based on this, the cold gas efficiency was estimated as 82.19%. At the point of the reaction temperature effect, because the cold gas efficiencies are more than 80% when the reaction temperatures are higher than 900 °C, the gasifier inner temperature must remain over 900 °C. At high reaction temperature such as 1,400 °C, the reaction pressure shows little effect on the cold gas efficiency. The addition of steam into the gasifier causes an endothermic reaction, and then lowers the gasifier outlet temperature. This is regarded as a positive effect that can reduce the capacity of the syngas cooler located immediately after the gasifier. The most significant factor influencing the cold gas efficiency and the gasifier outlet temperature is the O2/coal ratio. As the O2/coal ratio is lower, the cold gas efficiency is improved, as long as the gasifier inner temperature remains over 1,000 °C. With respect to the calorific value (based on the lower heating value, LHV) of produced gas per unit volume, as the N2/coal ratio is increased, the calorific value per syngas unit volume is lowered. Decreasing the amount of nitrogen for transporting coal is thus a useful route to obtain higher calorific syngas. This phenomenon was also confirmed by the operation results. 相似文献
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串行流化床煤气化试验 总被引:3,自引:3,他引:0
针对串行流化床煤气化技术特点,以水蒸气为气化剂,在串行流化床试验装置上进行煤气化特性的试验研究,考察了气化反应器温度、蒸汽煤比对煤气组成、热值、冷煤气效率和碳转化率的影响。结果表明,燃烧反应器内燃烧烟气不会串混至气化反应器,该煤气化技术能够稳定连续地从气化反应器获得不含N2的高品质合成气。随着气化反应器温度的升高、蒸汽煤比的增加,煤气热值和冷煤气效率均会提高,但对碳转化率影响有所不同。在试验阶段获得的最高煤气热值为6.9 MJ8226;m-3,冷煤气效率为68%,碳转化率为92%。 相似文献
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介绍福建本地型煤的特点及型煤间歇气化存在的问题。通过富氧气化攻关,证明福建本地型煤采用富氧气化比间歇气化更具优势,富氧气化可有效解决劣质煤的气化问题。经实际运行证实:富氧气化本地型煤具有炉况相对稳定、产气量大、煤耗低、炉渣残碳含量低等优点,但也存在炉上温度高、煤气中CO2含量高等问题,有待进一步解决。 相似文献
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Verification of scale-up models of the spouted bed gasifier requires experimental gas composition and temperature profiles within the reactor. Radial and axial profiles are presented for key gaseous species in a 0.30-m. dia, atmospheric pressure gasifier fed at about 30 kg coal/h. Low calorific value gases were generated at air/coal mass ratios of 2.87-4.08, while medium calorific value gases were produced at an oxygen/coal mass ratio of 0.84 and steam/coal ratios of 2.23-2.84. The combustion zone within the gasifier is delineated and the effects of operating conditions on gas composition and temperature profiles are illustrated for typical sub-bituminous and bituminous coals. Recycle of char to the bed from the primary cyclone and bed depth show little effect on profile shape. 相似文献