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<正> 1987年12月10~13日,在河南焦作化工三厂召开了自身返碱煅烧技术鉴定会,鉴定焦作化工三厂“自身返碱外混碱的煅烧技术”和连云港化肥厂使用的自身返碱煅烧技术。会议是在化工部科技局和制造局领导下,有50多个单位、130人参加。 相似文献
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以茂名油页岩渣为原料,用碱溶法生产白炭黑。碱溶法主要是先用碱溶液与原料煮沸,过滤除去铁化合物,然后再用盐酸处理滤液,最后得到白炭黑。进一步探讨了碱处理温度、碱处理时间、碱浓度、煅烧温度以及煅烧时间等对白炭黑产率的影响,较佳工艺条件为:煅烧温度900℃、煅烧时间4 h、碱处理时间3 h、碱处理温度70℃、碱处理浓度3.3 mol/L,该条件下白炭黑的产率可达16.1%。碱处理油页岩渣制备白炭黑可使油页岩渣得到充分合理的利用,实现废物资源化。 相似文献
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一、问题的由来 1.目前国内使用的自身返碱蒸汽煅烧炉类型简介众所周知,在纯碱生产中,重碱煅烧炉是煅烧工序中的关键设备。目前在国内各大、中及小型碱厂中常采用的有蒸汽煅烧炉、火炉和沸腾炉等三种炉型。其中,蒸汽煅烧炉能耗低、操作条件好、使用方便等优越性已为人们所公认。蒸汽煅烧炉由于输送返碱的方式不同,分为外返碱和内返碱两种类型。自1972年第一台内返碱炉在湖南冷水江制碱厂投产后, 相似文献
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本文叙述了纯碱煅烧工艺和设备的改造。改进是从煅烧炉、重碱和返碱混合装置预混器的应用以及输碱系统和输碱设备等方面进行的,从而提高了生产能力。 相似文献
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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。 相似文献
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概述了我国自行开发的自身返碱蒸汽煅烧炉技术发展状况 ,着重介绍笔者经过数十年来对煅烧炉技术不断研究和开发 ,使该技术在 5项重要指标方面均已超过了目前国内外蒸汽煅烧技术的先进水平 ,并已形成一种全新的LM型自身返碱蒸汽煅烧炉系列。 相似文献
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<正> 我厂纯碱系统采用化工部第八设计院设计的φ2m自身返碱蒸汽煅烧炉,其返碱设计由两个返碱口倒碱,倒碱时间占炉子每转时间的20%~25%,重碱由抛料机连续抛进炉内。由于设计为间断返碱,连续进重碱,造成在无返碱时,重碱缩小和堵塞返碱(?),使返碱断流,炉头结疤,经常被迫停炉清理。 相似文献
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Shell overheating and consequent heat loss are often encountered problems in the operation of a high temperature rotary calciner. Installation of a concentric metallic shield around the calciner provides a simple and relatively inexpensive solution to these problems. The heat shield can not only cool the shell but also recover most of the energy that otherwise would be lost. Substantial energy savings can therefore be realized. The success of such a shield in lowering the shell temperature of an industrial soda ash calciner is demonstrated by the way of computer simulation. The simulation has also been used to design a cascade control system and a feedforward control system for the calciner. The performance of these control systems is compared with that of the PID feedback control systems currently adopted in the plant. 相似文献
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介绍了φ3.6 m×30 m纯碱煅烧炉的设计改进要点、改进前后的结构特点及使用情况。生产实践表明,这种改进能提高该纯碱煅烧炉的使用性能及寿命。 相似文献
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李清菊 《化学工业与工程技术》2000,21(6):39-40
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。 相似文献
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We know that increasing the water content in coal tar above 4% and the ash content above 0.1% hinders its processing: soda
consumption is increased; greater heating is required in dehydration; and it is impossible to comply with standards regarding
the ash content in pitch coke and electrode pitch. Recently, the trend has been to introduce a centrifuge ahead of the final
tar store in systems for conditioning coal tar. 相似文献
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Study on a separation technology for more efficient utilization of pulverized coals in cement plants
A new separation technology for pulverized coals in cement plants was proposed. Two pulverized coals, NJ and ZZ, were sampled in two cement plants in China. Not only the ash and volatile matter content but also the size of the ash-containing particles and of those from which volatiles have to evolve have been determined with a float-sink method and a laser particle size analyzer. As the coal needed in a kiln and in a calciner is usually at a ratio of 4:6 in calorific value, the pulverized coals can be separated at 60 µm and 50 µm for NJ and ZZ samples, respectively. It was found that the ash content (air dry base) of the coarser part of NJ sample was 23.51%, in contrast to 34.72% before separation. Similarly, the ash content (air dry base) of the coarser part of ZZ sample was 13.86%, in contrast to 19.50% before separation. The coarser part of the coals is proposed to burn in a kiln while the finer part in a calciner. It was found from combustion simulation that the flames in a kiln are improved while the temperature profiles in a calciner change little. It is expected that the energy efficiency and cement quality will both be improved with this separation technique. Expected economical benefit and possible problems were discussed. 相似文献
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