共查询到19条相似文献,搜索用时 162 毫秒
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玻璃行业煤气发生站选择对比分析 总被引:1,自引:0,他引:1
从几个方面、不同角度,简要分析了可用于玻璃生产企业的以一段式煤气发生炉、两段式煤气发生炉和干馏式煤气发生炉为气化炉型的不同类型煤气发生站,为玻璃生产企业选择煤气发生站提供了相关参考. 相似文献
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发生炉正常炉出煤气温度与气化用煤的化学反应活性和气化用煤的挥发分及水分含量相关。气化化学反应活性较强的煤,气化反应温度相对较低,其正常炉出煤气温度也相应较低。随着气化用煤中挥发分及水分含量的增高,发生炉正常炉出煤气温度降低,煤中水分含量对炉出煤气温度影响较大,相比而言,煤中挥发分含量对炉出煤气温度的影响相对较弱。正确确定发生炉在气化不同煤种时的正常炉出煤气温度指标,有利于操作人员根据出煤气温度的变化,准确判断并正确处理炉况。 相似文献
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两段炉就是将煤的干馏和气化过程在一个炉体内分两段完成,我国常见的两段炉有国产的(如唐山轻工机械厂)和从国外引进的(如意大利IGI公司)等几种,规格大小(直径约3m、总高约30m)。两段式煤气发生炉的主要指标见表1。 相似文献
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对某瓷厂发生炉煤气成分及热值的波动进行了分析,认为煤料水分和煤气冷却温度是主要影响因素,并对煤料的挥发分及发生炉操作进行了分析,提出一些解决办法。 相似文献
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本文对某瓷厂一段式发生炉煤气成分及热值的波动进行了分析,认为煤料水分和煤气冷却温度是主要影响因素,并对煤料的挥发及发生炉操作进行了分析,提出一些解决办法。 相似文献
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Andy Gradel Robert Honke Joachim Alfred Wünning Tobias Plessing Andreas Jess 《化学工程与技术》2019,42(9):1895-1906
Thermal gasification of biomass is known for its capabilities in flexible and decentral power station applications for cogeneration. However, the product gas contains tar compounds adversely for a stable operation. Integrated tar adsorption in a subsequent cooled section is therefore an option to reduce the tar pollution. The char coal, used here as adsorption agent, is formed by biomass pyrolysis in the gasifier. A kinetic model is proposed, considering the kinetics of all main reactions as well as heat and mass transport phenomena. Results are presented for axial temperature profiles, gas compositions, and the gas purity at different air‐to‐fuel ratios. The resulting output mass flows could indicate a requirement on the adsorption capacity of at least 0.3 g g?1 for the activated char coal. 相似文献
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A three stage equilibrium model is developed for coal gasification in the Texaco type coal gasifiers based on Aspen Plus to calculate the composition of product gas, carbon conversion, and gasification temperature. The model is divided into three stages including pyrolysis and combustion stage, char gas reaction stage, and gas phase reaction stage. Part of the water produced in the pyrolysis and combustion stage is assumed to be involved in the second stage to react with the unburned carbon. Carbon conversion is then estimated in the second stage by steam participation ratio expressed as a function of temperature. And the gas product compositions are calculated from gas phase reactions in the third stage. The simulation results are consistent with published experimental data. 相似文献
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对一种新型两段式水煤浆气化炉的气化效率进行了数值计算和分析。模型中将水煤浆的气化过程分为水分蒸发、煤热解、气相反应和气固异相反应等子模型。气相反应速率需同时考虑湍流混合和化学反应机理,气固反应的速率采用未反应缩芯模型。运用可实现k-ε模型描述气相湍流流动,随机轨道模型追踪水煤浆颗粒的运动。以中试多喷嘴水煤浆气化炉为建模基础,验证了该水煤浆气化模型的准确性。模拟计算得出新型两段炉的有效气组分含量为85.91%,冷煤气效率为76.42%。 相似文献
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针对乙烯裂解炉的控制问题,提出了一种鲁棒性较强的先进控制策略,该方法有效地解决了裂解原料组分和燃料气热值波动对裂解炉裂解气出口温度的影响,实现裂解气出口温度和裂解炉加工总量的精细化控制,优化控制器可一键投运和切除,解决了裂解炉控制问题的复杂性。该方法成功应用于兰州石化460kt/a乙烯装置,提高了装置的平稳率,提升了双烯及碳四等产品的收率。 相似文献
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通过煤热解技术获取紧缺的油气资源是低阶煤清洁利用的有效途径之一。针对煤热解工艺存在焦油产率与品质难以控制以及焦油中粉尘含量高等关键技术问题,从煤的热解反应机理出发,详细探讨了热解挥发分二次反应的种类和发生条件以及影响热解过程的主要因素,结合煤热解技术应用,总结了逆向传热与传质所导致的挥发分气相二次反应是焦油产率下降的主要原因;同时,分析了热解过程中煤颗粒破碎机理以及煤热解过程中粉尘的主要来源。在前人研究结果的基础上,提出控制热解挥发分的流动方向从高温区向低温区流动、热解耦合气化以及耦合原位的焦油提质与除尘等方法可以调控煤热解过程,抑制重质焦油生成、提高焦油中轻质组分含量以及减少焦油中的含尘量,从而实现煤的定向热解。 相似文献
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干煤粉加压气化装置控制系统研究 总被引:2,自引:1,他引:1
以干煤粉加压气化技术为基础,分析该类型气化装置的运行特点和控制要求,重点讨论气化炉负荷控制和合成气质量控制的关系,提出氧气流量作为气化炉负荷控制主控变量、氧煤比作为合成气质量控制主控变量的控制策略,并制定详细的控制系统设计方案。 相似文献
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Rapid pyrolysis of Taiheiyo coal was investigated with a laboratory-scale batch type reactor (BTR), which was specially developed to study various gasification processes at the conditions close to an industrial entrained bed gasifier. The experiments were carried out in helium at 1073 K, 7.1 MPa, varying reaction times from 1 to 80 s and coal/gas ratios in the range of 0.41-1.65 g/l. Extents of pyrolysis and profiles of product formation were discussed based on the results of char yield, gas and tar formation characteristics. It was observed that reaction of pyrolysis was significantly affected by coal/gas ratio. At high coal/gas ratios, pyrolysis was found to be retarded at initial stage. Pyrolysis products can be roughly divided into two groups. One is the ultimate products such as methane, carbon oxides, hydrogen, and benzene and the other is the intermediate products such as ethylene and toluene. Heat supply inside BTR was examined and the influence of thermal properties of atmospheric gases was investigated by carrying out pyrolysis in nitrogen and by comparing the results with that in helium. As a result, the heat capacity of atmospheric gas has less influence on pyrolysis process whereas heat conductivity of atmospheric gas as well as mixing conditions of gas and coal sample significantly affect the pyrolysis reaction. 相似文献
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为考察原料煤中水分对神东煤热解产物分布的影响,通过格金试验和固体热载体小试试验研究了神东煤中水分对热解特性的影响,得到神东煤在不同水分下热解产物的分布规律。格金试验表明,水分对神东煤热解产物中焦油和热解气收率有显著影响。随着水分降低,神东煤热解产物中焦油收率从9.98%降至4.92%,热解气收率从8.47%上升至11.07%,热解水收率从2.74%上升到5.94%。小试试验结果与格金试验趋势基本相同。随着原料煤中水分的降低,焦油收率下降,热解气收率上升;未经干燥的原煤在不同温度下热解的焦油收率比干燥后煤样平均高2.17%,热解气收率平均低1.58%。热解温度对H2和CO比例影响较大,对其他气体比例影响较小。研究结果表明,水分对神东煤的热解过程及其热解产物分布有显著影响,热解原料煤中水分的增加有利于抑制神东煤热解水和热解气的生成,提高焦油收率,因此有望通过控制原料煤中的水分来调节热解产物的分布。 相似文献