共查询到20条相似文献,搜索用时 140 毫秒
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目前,我国常用的旋风炉炉衬采用碳化硅,这种炉衬成本高、施工复杂,运行中也不断被烧坏。为此本文对碳化硅和其他矾土质炉衬的导热系数、抗高温腐蚀能力及机械强度等进行了比较,从而认为采用矾土质炉衬代替碳化硅是可行的、有效的。 相似文献
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本文简述了锅筒底部采用异形砖挂砌,经运行后经验证明,异形砖挂砌因质量无法保证,短期内会大面积脱落,影响生产,影响锅炉安全.又根据实践经验采用矾土水泥耐热塑料代替异形砖挂砌只要工艺确当,是可行的。 相似文献
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链条锅炉的炉排上煤层厚度,利用可自由上、下升降的煤闸门来调节。煤闸门一般是在托砖梁(灰铸铁)上砌筑耐火砖,也有直接用矾土耐火混凝土浇灌的。按照链条锅炉的燃烧要求,燃烧应在距煤闸门前0.3—0.5米处开始,这样,煤闸门基本不会烧坏。但往往由于操作不当,或分段送风的调节风门、风室不严密,促使燃烧在煤闸门下进行,因而煤闸门的使用寿命不长。我厂两台南通锅炉厂产的SHL10—16型10T/H锅炉,煤闸门原设计为矾土耐火混凝土的, 相似文献
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矾土水泥混凝土预制坩埚用于工频无心炉熔炼铝及铝合金舒克炎青岛崂山电炉厂我国在铸造行业中对于铝及铝合金的熔化,在60年代至80年代初,主要采用电阻炉,到了80年代初以后,逐渐被无心工频炉所代替。但到目前为止,在无心工频炉上熔化铝及铝合金主要是使用铁坩埚... 相似文献
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本文详尽地介绍了在矾土焙烧竖窑底部熟料冷却段,采取下鼓上抽的联合通风方式冷却熟料,抽出的热风通过普通的空气加热器,反向换热,加热采暖循环水。该装置经过实践运行与测试,证明它一方面有效地解决了熟料的冷却,也延长窑底钢梁、推料杆以及熟料运输机的寿命,并改善了操作环境,另一方面又回收了大量热能于建筑物采暖。 相似文献
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我所锅炉房有两台RSL2.8—0.7/95—A型热水锅炉(快装锅炉),于1982年投入运行。在长期的运行过程中主要存在以下问题,即锅炉每运行3~4个月后,总发生前拱(烧矾石、矾土水泥预制件)烧坏事故,致使前拱产生裂纹、剥落甚至崩塌。影响了锅炉的安全、经济运行。 相似文献
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Akshay R. Bavda Pratap S. Bapat Vishal B. Joshi Rajendra S. Thakur 《International Journal of Hydrogen Energy》2018,43(47):21699-21708
The existence of high levels of fluoride in drinking water is a worldwide problem and activated alumina is an established adsorbent for fluoride removal. This article investigates factors governing rate of fluoride uptake, mechanical stirring as well as interference from competing ions, of the defluoridation employing activated alumina. Pre-treatment with aqueous solution of sulphuric acid has shown faster uptake in a small setup was demonstrated recently. An attempt to understand the phenomena by profiling ionic species on the active surface of activated alumina, native and acid treated. Presence of carbonate species was found, in Raman spectra, on native surface which can explain effectiveness of pre-treatment. Broadening of hydroxyl species profiles, in infrared and solid-state NMR spectra, suggests incorporation of water into new sites. Fluoride treatment of the pre-treated activated alumina leads to narrowing of hydroxyl species profiles suggesting incorporation of fluoride into new sites. A mechanism is being proposed wherein H+ ions in the presence of SO42- (from KHSO4 or NaHSO4) enables the energetics for faster defluoridation and regeneration of activated alumina. 相似文献
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煤的挥发份组分对NOx和SOx排放的影响 总被引:5,自引:1,他引:5
在煤的燃烧过程中,NOX和SOX的形成大部分来源于挥发份的燃烧。对于不同的煤种,其挥发份的含量和组分是不同的。本文专门研究了煤的挥发份在富氧燃烧条件下,不同挥发份组分对NOX和SOX形成与排放的影响。通过基于化学反应动力学机理的模型计算发现,在不同组分的挥发份燃烧过程中,NOX和SOX的形成规律相似,但在煤的含氮量和含硫量相同的条件下,NOX和SOX的排放量受挥发份组分的影响较大,其排放量与燃料的 相似文献
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The feasibility of employing activated alumina and water, as reversible reaction pairs, in an integrated thermochemical heat-pump / energy-store has been studied theoretically and experimentally. The use of such a heat pump for the provision of heating and cooling applications has been investigated. With the activated alumina absorbing water by up to 45±1% of the dry alumina's weight, a heat of adsorption of 2.92 ± 0.1 MJ/kg of water has been achieved. 相似文献
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The deposition of elemental sulfur on porous adsorbents (commercial pre-sulfurised activated carbons and alumina, an HY zeolite and a selenised adsorbent) has been observed when the adsorbents are exposed to a gaseous stream containing hydrogen sulfide and oxygen. The sulfur deposition from H2S is more marked for the activated carbons and the alumina, it is substantially decreased when zeolite is used, and is practically insignificant for the selenium-based adsorbent. For the pre-sulfurised activated carbons, further sulfur deposition is initially beneficial in terms of increasing their mercury chemisorbing capacity but, subsequently, the structural properties are affected and this results in a drastic reduction in adsorption capacity. Further sulfur deposition on the pre-sulfurised alumina seems immediately to compromise its capacity to chemisorb mercury. The selenium-based adsorbent shows problems with detachment of the fine mercuric selenide powder from the matrix. Sulfur deposition on the initially unsulfurised zeolite improves its mercury adsorption capability. The initially sulfur-free zeolite could be a promising adsorbent for the treatment of this specific type of gas stream. In fact, after a moderate level of sulfur deposition from oxidation of hydrogen sulfide, it can simultaneously chemisorb the mercury vapours by reaction with the sulfur itself while, unlike the activated carbons and alumina, maintaining its required structural properties for a relatively long period. 相似文献
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NeNOx催化剂研究进展 总被引:1,自引:0,他引:1
氮氧化物的脱除是治理空气污染的一大难题。选择性催化还原、非选择性催化还原及催化分解是目前研究较多的脱除氮氧化物的方法。本文介绍了这3类催化剂的研究历史、现状及应用前景。 相似文献
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人工神经网络具有联想、记忆、并行计算、自适应、自学习、适于处理非线性问题等优点.电站燃煤锅炉NOx排放规律非常复杂,很难对其进行建模.提出电站燃煤锅炉NOx排放量的神经网络模型,该神经网络模型具有可以预测各一次风粉单元NOx生成量、锅炉NOx排放量、网络隐节点数少、泛化能力强、鲁棒性好、学习速度快的优点.所提出的模型可以为大型电站锅炉通过燃烧系统自动调整或结构改造降低NOx排放提供依据. 相似文献
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