浅谈蒸汽煅烧炉返碱带的模具设计

对自身返碱蒸汽煅烧炉返碱带制造及安装过程中存在的问题进行了阐述,并详细介绍了返碱带模具的设计及试用中取得的效果。     

自身返碱重灰煅烧炉的抄板改造

我公司为了提升重灰煅烧炉产能，将螺旋管由原设计的"三根返碱一根出碱",改为了"两出碱，两返碱",由此带来螺旋倒碱管堵塞、炉头泄漏、下游设备腐蚀等问题。出现问题的主要原因是原设计中炉头抄板较短，推送能力不够。通过更改炉头抄板尺寸、增加一排炉头抄板等措施，达到了预期效果。     

蒸汽煅烧炉托轮的调整

本文对自身返碱蒸汽煅烧炉托轮的安装调整,总结出了一种直观的,准确无误,且行之有效的方法——“左、右手定则”,可方便生产现场操作人员掌握使用。     

φ2500自身返碱蒸汽煅烧炉的改进

通过对龙化厂2500自身返碱蒸汽煅烧炉整个煅烧系统的改进,使得它在返碱温度、炉气CO2浓度、汽耗、灼烧失量等6个方面比吉兰泰碱厂同类型炉更具优势。此外该文还介绍了此炉22项安装技术质量保证指标。     

关于蒸汽煅烧炉返碱量的控制

分析了影响蒸汽煅烽炉返碱量控制的有关因素,通过对返碱量的理论计算,以及插板控制法和返碱螺旋运输机转数控制的比较,认为用返碱螺旋运输机转数控制法是一种较好的控制返碱量方法。该法控制的返碱量足量、平稳、且可避免人为因素的波动。     

外返碱和自身返碱蒸汽煅烧炉比较

本文主要是对传统的外返碱蒸汽煅烧炉和自身返碱蒸汽煅烧炉做一简单比较。     

我厂煅烧炉系统的技术改造

为满足纯碱生产能力 ,新增一套煅烧炉系统。煅烧炉型为外返式 ,并对炉体局部进行了优化 :炉尾设出料阀 ,加大滚圈与托轮的接触面积 ,炉内设置三排带翅片的加热管。另将减速比由 1∶17调整为 1∶11。技改后系统运行状况良好。     

轻灰3~#蒸汽煅烧炉系统设备改进

我公司对轻灰3~#蒸汽煅烧炉主要设备进行技术改进,热碱液塔材质更换更新、分离器扩径更新、返碱刮板运输机加宽更新、主传动结构更新、大齿圈更换、冷凝水系统更新、增设出料阀等,改造后提高了轻灰3~#蒸汽煅烧炉生产能力,稳定了生产,效果显著。     

φ3200×29400自身返碱蒸汽煅烧炉的改进

φ320O×29400自身返碱煅烧炉是八院设计目前国内最大的自身返碱煅烧炉。该炉设计是成功的、试车也比较顺利,并很快转入正常生产。在试车过程中也暴露了一些问题,本文仅就试车中影响较大、时间拖得较长、大家比较关心的几个问题的分析与改进,如提料斗的改进、炉气波动大的改进、重碱与返碱予混的改进等作了简单的介绍。为了加深对φ3200×29400蒸汽煅烧炉的了解,也对煅烧炉的特性及结构作了介绍。     

自身返碱煅烧技术新突破

南化有限公司的 2 0 0 0自身返碱煅烧炉从投产以来 ,其产品的合格率极低 ,公司仅用了约 2 5万元、5 0天进行技术改造 ,一次开车成功便生产出全优产品 ,班产量达 70t ,创造了自身返碱煅烧炉单位容积生产能力的全国最高记录     

乙烯酮(双乙烯酮)下游产品废水的治理技术

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。     

A study of miscibility of blends of polybutadienes of varying microstructure

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.     

几种乙炔加压设备性能的比较

阐述并比较了几种加压设备在乙炔加压清净过程中的性能和特点。     

粉煤灰中烧失量检测的不确定度分析

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。     

生物油的成分分析及物性测定

以添加FeCl2的ZnCl2-KCl混合熔盐裂解纤维素和秸秆,制得生物油。采用傅立叶变换红外光谱法和气相色谱-质谱法分析生物油的成分。结果表明,生物油中成分复杂,含有氧元素、多种有机化合物,主要包括酮类、醛类、酚类及羧酸类等。测定了20～80℃生物油的密度和粘度,发现生物油的密度与温度呈较好线性关系,而生物油的粘度均大于水的粘度,且不同熔盐体系对秸秆生物油的粘度无较大影响。     

Effect of degree of deacetylation of chitosan on the kinetics of ultrasonic degradation of chitosan

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     

分解炉扩径的技术改造

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     

水泥水化热测定方法综述

水泥水化热是中、低热水泥和核电工程用水泥的一项关键的技术指标。全球范围内测定水泥水化热的方法有溶解法、直接法/半绝热法、等温传导量热法三种。本文总结了中、美、欧相关方法标准,对其测试原理、仪器设备、试验过程等方面进行了比对,并对其在领域的应用做了简单的概括。