低热值高炉煤气与煤粉混烧技术的探讨

通过对低热值高炉煤气与煤粉混烧特性分析 ,指出影响混烧的技术难点在于解决燃烧稳定性、混合爆炸性、受热面超温、排烟温度和飞灰含碳量偏高等问题 ,并提出了相应解决措施。通过工业混烧实践 ,在670t/h电站锅炉上高炉煤气与煤粉稳定混烧量可达 1 5万m3 /h ,最大混烧率达 1 8% ,为冶金行业综合利用低热值废气提出了一条有效途径     

焦炉煤气与高炉煤气混烧电技术方案的探讨

1焦炉煤气回收势在必行山东泰山钢铁总公司是一家集钢铁、水泥、机械、炼焦。发电为一体的国家大型企业集团。近年来,随着企业规模的不断扩大,1993年,作为地级莱芜市的重点工程,新上年产十五万吨的焦化厂一座,这不仅解决了泰钢的生产用焦问题,也为城市居民的煤气供应提供了可靠的气源。但由于种种原因,煤气用户未能及时开拓,以至于煤气的生产严重供过于求,致使大量煤气不得不排入空中。总公司虽然不失时机地将焦炉煤气引入炼钢、轧钢及生活锅炉使用,但仍有大量剩余煤气排空,这不仅造成了巨大的能源浪费,也严重污染了周围的环境…     

煤和高炉煤气混烧锅炉的开发设计

20t/h燃用二类烟煤和高炉煤气的混燃锅炉的开发设计，所采用的各种设计措施和手段，确保锅炉燃烧稳定，节能效果良好，同时改善了环境。大力发展可利用能源是当今的又一发展方面。     

低热值高炉煤气应用实践SHL20-2.45/400-AⅡ型燃煤锅炉改燃高炉煤气改造

文章介绍了一台SH120-2．45／400-AⅡ型燃煤锅炉改造为燃高炉煤气的实例，并对锅炉燃烧设备、受压元件、炉墙、外接管路、控制部分等的改造技术作了较详细的阐述。     

采用优质煤粉混烧实现节能降耗

通过优质煤粉混烧,使原来为燃用劣煤设计的燃煤锅炉的热燃烧工况大幅改善,热效率提高,三废排放减少,还节约了助燃柴油和冲排水和辅助用能。     

煤粉锅炉掺烧高炉煤气对煤粉燃尽影响的研究

针对某钢铁企业实际燃用的燃料，计算得到了高炉煤气掺烧率变化引起的烟气生产量变化和燃料理论燃烧温度变化曲线，在此基础上分析了高炉煤气掺烧对煤粉燃尽影响的各种因素，其中煤粉在炉膛内停留时间缩短、炉膛温度水平下降是最主要的因素。通过在一维炉和滴管炉上进行的温度对该种煤粉燃尽影响的试验研究，分析了高炉煤气掺烧率超过20%时飞灰可燃物含量急剧上升的原因，从而提出基于燃尽的煤粉锅炉掺烧高炉煤气的最佳热量掺烧率应该在25％左右。图5表3参6     

浅谈高炉煤气锅炉设计要点

本文简要介绍了杭州锅炉集团有限公司开发各类参数高炉煤气锅炉的经验，就高炉煤气燃烧特性、受热面布置和提高锅炉效率等问题，阐述了高炉煤气锅炉的设计要点。     

410t/h煤粉炉乏气送粉改造降低NO_x排放的试验研究

针对某电厂410 t/h煤粉炉在300 t/h以上高负荷下运行时NOx排放无法达标的问题,提出了将原中储式温风送粉系统改造为乏气送粉系统,技术方案为排粉风机出来的乏气全部送入一次风管道,直接采用乏气作为送粉介质输送煤粉,避免乏气直接送入炉膛造成的局部富氧气氛,从而有效抑制乏气中的煤粉燃烧NOx生成量。试验及调试结果表明,采用乏气送粉改造后,锅炉燃烧稳定、热效率未受影响,NOx排放降低到100 mg/m3以下(折算到氧量6%)。     

燃煤气单元玻璃熔窑火焰空间数值模拟

通过建立火焰空间三维数学模型来模拟燃煤气单元玻璃熔窑火焰空间内的流动、燃烧、传热等过程。针对煤气的燃烧特点,单元窑的火焰特征等进行了较深入的研究。结果表明,该三维数学模型能够比较全面地反映火焰空间速度场、温度场分布的规律;模型具有通用性好,不易受环境波动影响的优点,具有一定的实用意义。     

Hybrid filtration combustion of natural gas and coal

Rich and ultrarich combustion of natural gas in a porous medium composed of aleatory coal particles and alumina spheres was studied experimentally to evaluate the suitability of the concept for hydrogen and syngas production. Temperature, velocity and chemical products of the combustion waves were recorded experimentally in two stages: (1) natural gas in an inert porous medium at filtration velocities of 12, 15 and 19 cm/s for equivalence ratios (φ) from φ = 1.0 to φ = 3.8; (2) natural gas in a porous medium composed of coal and alumina particles for a range of volume coal fractions from 0 to 75% at φ = 2.3, and a filtration velocity of 15 cm/s. It was observed that the flame temperatures and hydrogen yields were increased with the increase of filtration velocity in inert porous media. In hybrid porous media the flame temperature decreased with an increase of coal fraction, and hydrogen and carbon monoxide were dominant partial oxidation products. Syngas yield in hybrid filtration combustion was found to be essentially higher than for the inert porous medium case. The maximum hydrogen conversion for the hybrid coal and alumina bed was ∼55% for a volumetric coal content of 75%.     

链条炉中劣质煤燃烧的分析

本文根据链条炉的燃烧特性,对燃煤的适应性要求,分析讨论了劣质煤在链条炉中的燃烧技术,并就末煤型无烟煤的燃烧提出改进措施。     

切圆锅炉煤粉燃烧过程的数值研究与工业测试

为了了解额定蒸发量为130t/h的煤粉锅炉热效率偏低,水冷壁常发生结焦现象的原因,对锅炉进行了冷态空气动力场以及热工综合测试,并应用κ－ε－g气相湍流燃烧模型与煤的双辉反应热解模型对炉流动,燃烧以及传热过程进行了数值计算。冷态与热态的数值计算结果与测试结果相吻合。其结果表明：炉膛内空气过纱数偏小导致锅炉热效率偏低;同一标高的4个燃烧器喷出的气流速度相差较大,使气流在人形成的实际切圆偏离炉膛中央,导致火焰刷壁,水冷壁结焦。     

Three dimensional modeling of pulverized coal combustion in a 600 MW corner fired boiler

IntroductionThe developments relative to coal combustion havebeen performed into a general purpose 3D code namedESTET under quality assurance, and used to modelcomplex turbulent reactive flows. In the case ofindustrial boilers we can assume a no-slip conditionbetween gas and particles which is the case for the mostpart of the furnace, except possibly in the near field ofthe burners. With such an assumption, the equations for apafticle-gas fixture with a mean density can be written.The combu…     

不同采矿深度准东煤物化特性和燃烧性能研究

选取天池能源浅层和深层煤样进行研究,以大同烟煤作为对比,了解采矿深度对煤质及燃烧特性的影响,为准东煤的勘探和燃烧提供必要的理论依据。研究发现,随着采矿深度的增加,煤中水分减少、灰分降低、发热量增加、含硫量减少,煤质更加接近烟煤;煤灰中Fe2O3明显减少,煤的结渣趋势减轻;煤的着火温度略有降低,燃烧速率提高,燃烧特性变好。与大同烟煤相比,准东煤高水分、低发热量、低氮含量,燃烧时着火温度显著降低且燃烧速率低。     

电站煤粉锅炉火焰监测与燃烧诊断优化控制研究

为保证锅炉安全运行,必须进行切实有效的火焰监测和燃烧诊断措施。基于火焰图像处理技术的电站锅炉火焰监测和燃烧诊断优化控制系统,能够实时在线地监视火焰图像,对火焰图像特征进行分析,对炉内温度场进行重建,同时进行燃烧稳定性、经济性和清洁性的判断,提出运行建议,并利用炉内辐射能信号响应灵敏、迅速的特点将其作为负荷控制的前馈信号,接入DCS控制逻辑中以提高锅炉的负荷响应能力和抗干扰能力。     

A mathematical model for exit gas composition in a 10 MW fluidized bed coal combustion power plant

A mathematical model has been developed for the oxygen mass balance for a 10 MW fluidized bed coal combustion power plant operated at Jamadoba (TISCO, India). Assuming the three phase theory of fluidization, the fluid bed is considered to consist of a number of equivalent stages in series. Within each stage, an exchange of gas takes place between the bubble, cloud-wake, and emulsion phases. An effective chemical reaction rate of char combustion has been derived considering the single film theory of char combustion for shrinking particles. The model has been used to predict the consumption of oxygen in the fluidized bed combustor, the outlet gas composition, variation of oxygen concentrations in different phases and also the variation of average oxygen concentration along the bed height. Model predictions were compared with plant data, and reasonable accuracy was obtained.