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针对某大型粉煤气化装置存在粗合成气带灰,导致变换脱毒槽积灰严重,压差上涨过快无法长周期运行的问题,分析变换脱毒槽积灰的原因,通过对气化洗涤塔、变换脱毒槽结构改造、工艺调整优化,较好的解决了变换脱毒槽积灰严重的问题,从而实现装置安、稳、长、满、优运行。 相似文献
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针对空压机入口过滤器压差高,滤芯更换频繁。装置负荷在80%~100%波动,影响空压机和氧化反应器的运行。对原过滤器结构和空气组成及空压机运行情况进行了分析,找到了过滤器压差高的原因。主要是空压机入口过滤器压力变化后,露点变化,有液体析出和灰尘混合糊在过滤器上,而且吹不下来,造成过滤器压差高。将原来的2级过滤改为1级分离和1级过滤,并加排水设施。过滤压差由10 kPa变为0.3 kPa。过滤滤芯由3个月更换1次变为2年,不影响装置负荷。 相似文献
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《中氮肥》2020,(4)
山西晋煤华昱煤化工有限责任公司1 200 kt/a甲醇装置、500 kt/a清洁燃料装置之等温变换系统设计为双系列并联运行,2018年8月18日变换系统二系列(变换系统Ⅱ)接气投运,2018年9月13日变换系统一系列(变换系统Ⅰ)接气投运。在变换系统双系列运行的1 a多时间内,系统开车及运行中出现了净化炉导气时床层超温、变换系统压差高报警、变换炉出口工艺气温度低和中压蒸汽过热度不够、变换炉催化剂床层局部温度高、工艺气中羰基硫含量高等问题,通过原因分析并采取相应的优化技改措施后,基本实现了变换系统的安全、稳定、长周期运行,各项指标满足系统高负荷运行的要求,3台航天炉气化高硫煤时系统也能长期运行(下一步将向4台航天炉气化高硫煤进发);同时,对变换系统中存在的个别问题提出了彻底解决的优化改造建议。各项优化技改措施逐步落实后,可望为系统的安、稳、长、满、优运行提供更有力的保障。 相似文献
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《中氮肥》2020,(2)
陕西延长中煤榆林能源化工有限公司1 800 kt/a甲醇项目中,600 kt/a煤制甲醇装置气化单元采用多元料浆气化工艺,设有3台气化炉(两开一备),装置自2014年6月原始开车以来,运行平稳,但2017年7月6日至今,气化炉烧嘴压差频繁发生波动且无规律性,严重影响气化装置的稳定运行。为此,对可能影响烧嘴压差的因素——烧嘴质量、高压煤浆泵运行状况、煤浆质量、原料煤煤质等逐一进行分析与排查;并结合实际生产情况重点对原料煤煤质波动(灰分高、灰熔点高)对烧嘴压差的影响进行分析与探讨,最终得出气化炉烧嘴压差波动主要是原料煤灰分高所致;分析烧嘴压差波动对有效气产量及成分、灰水水质、烧嘴使用寿命、碳利用率的影响,并提出相应的调控措施。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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The miscibility of various amorphous polybutadienes with mixed microstructures of 1,4 addition units (cis, 1,4 and trans 1,4) and 1,2 addition units have been investigated. The studies here involved optical transparency, differential scanning calorimetry, and small angle light scattering. It was found that a 90 percent (cis) 1, 4 addition polybutadiene was immiscible with high (91 percent) 1,2 addition polybutadiene. Reduction of the 1,2 content to 71 percent induced an upper critical solution temperature (UCST) with the cis 1,4 polymer. Polybutadienes with 50 percent and 10 percent 1,2 contents were miscible above the crystalline melting temperature of the cis 1,4 polybutadiene. Immiscibility of the 91 percent 1,2 addition polymer was also found with a 10 percent 1,2 polybutadiene. The latter polymer also exhibits an UCST with the 71 percent 1,2 polymer. The results are used to interpret the characteristics of blends of polybutadienes of varying microstructure. 相似文献
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以F类粉煤灰为例,详细介绍了测定粉煤灰中烧失量的步骤、计算数学模型、影响测量不确定度的因素以及各项测量不确定度分量评定,人员、设备、材料、方法、环境都是影响测量不确定的因素。 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献