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介绍某钢厂目前采用蓄热式钢包烘烤器在使用过程中存在的一些问题,详细说明了预混内燃自吸式烤包器的技术原理和特点,以及该技术在钢包烘烤器上面的应用,该技术可以解决蓄热式钢包烘烤器运行中存在的一些技术难题,并取得了明显的节能效益。四川德胜集团钒钛有限公司80 t蓄热式钢包烘烤器改造成预混内燃自吸式钢包烘烤器后,预混内燃式钢包烘烤器钢包的最高温度由650℃提高到750℃,在线烘烤时间由56.5 h缩短至29 h,转炉煤气消耗量由25 696 m~3减少到20 506 m~3,转炉煤气点火采用自动点火方式,提高了设备安全使用性能。 相似文献
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采用蓄热式燃烧技术对原常规钢包烘烤器进行了技术改造,实践证明,蓄热式钢包烘烤器具有升温均匀、安全稳定可靠、节能等特点。可提高钢包烘烤效率和包衬温度,具有广泛的推广价值。 相似文献
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1项目的目的和意义在炼钢生产过程中,转炉生产出来的钢水倒入钢包内,然后运至连铸机进行浇铸。钢包在装钢水前必须将其烘干加热,一般钢包烘烤的温度在1000℃以上。钢包烘烤器就是通过燃料燃烧来加热钢包的装置。我国冶金企业的钢包烘烤器多为立套管式烘烤器,中心管通入煤气,外套管通入助燃空气。通过生产实践,发现立套管式烘烤器存在以下问题。 相似文献
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为了更好的使用转炉煤气,提高转炉煤气的吨钢回收能力,减少一次能源的消耗,不断开发转炉煤气用户,用转炉煤气取代焦炉煤气作为钢包烘烤器燃料,并且采用高温空气燃烧技术(HTAC)对钢包烘烤器进行了节能技术改造.实践证明,此次改造是成功的,给梅山带来经济效益及社会效益,具有广泛的推广价值. 相似文献
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脉冲燃烧器的工作原理与应用 总被引:2,自引:0,他引:2
本文介绍了脉冲燃烧器的工作原理.阐述了这种燃烧器具有热效率高、烟气中有害成分少和结构简单等优点,有广泛的应用范围。影响脉冲燃烧器运行的主要因素有:燃烧器各部分的形状和尺寸、气阀的膜片、热负荷及燃气的燃烧特性。 相似文献
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以液排渣旋风燃烧过程为基础的煤粉低尘燃烧器可在燃烧过程实现捕渣,为工业加热提供低含尘浓度的高温火焰,是工业加热过程实现以煤代油的先进燃烧技术。根据旋流燃烧流动特点,采用能考虑非均向湍流应力的雷诺应力模型,对旋流煤粉低尘燃烧器内气流流动过程场进行数值模拟计算,计算结果与流场实验测试相吻合。研究表明,气流进入燃烧器时的旋转强度(旋流数)对燃烧器内的流动特性有很大影响,在冷态模型条件下,当旋流数在7以上时,环室回流在轴向贯穿燃烧器整个流场,有利于增加煤粉颗粒在燃烧室内的循环次数,提高灰渣捕获率;低于7时,环室回流出现阻断,不再连续,易造成煤粉颗粒直接逸出,对燃烧及灰渣捕获不利。随旋流数增加,燃烧器出口处中心回流率增大,对炉膛高温烟气的抽吸作用增强。 相似文献
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洛阳石化1400kt/a延迟焦化装置加热炉采用一炉两塔流程,于2008年6月投产,计算热负荷为45.41MW,加热炉为两室四管程双面辐射箱式结构,加热介质为减压渣油。为降低装置能耗,于2011年9月对加热炉进行改造。改造内容包括更换燃烧器、改造空气预热器、采用先进控制、改造炉墙和增加仪表监测。改造后,利用FLUENT软件,对燃烧室中燃料气的燃烧特性和新型燃烧器某截面的温度场进行数值模拟,分析得出,新型燃烧器大幅降低了燃烧过程中氮氧化物的生成,保证了燃料气在低过剩空气系数下的充分燃烧;计算表明,空气预热器的改造提高加热炉热效率0.92%。先进控制技术的应用,减轻了劳动强度,提高了调节精度和加热炉运行的平稳率,达到了提高加热炉热效率的目的。综合改造后,加热炉热效率高达93.45%,与改造前相比,热效率提高1.81%。 相似文献
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Cold airflow experiments on a small-scale burner model, as well as in situ experiments on a centrally fuel-rich swirl coal combustion burner were conducted. Measurements were taken from within a 300 MWe wall-fired pulverized-coal utility boiler installed with eight of centrally fuel-rich swirl coal combustion burners in the bottom row of the furnace during experiments. Various primary air ratios, flow characteristics, gas temperature and gas species concentrations in the burner region were measured. The results of these analyses show that with decreasing primary air ratio, the swirl intensity of air, divergence angles and maximum length and diameter of the central recirculation zone all increased, and the turbulence intensity of the jet flow peaked but decayed quickly. In the burner nozzle region, gas temperature, temperature gradient and CO concentration increased with decreasing primary air ratio, while O2 and NOx concentration decreased. Different primary air ratios, the gas temperatures and gas species concentrations in the side-wall region varied slightly. 相似文献
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《International Journal of Hydrogen Energy》2022,47(42):18551-18565
With the pressing need to reduce greenhouse gas emissions, blending lower or zero carbon fuels like renewable hydrogen into natural gas is a promising and practical way to achieve clean energy transition. From the perspective of end users and combustion device manufactures, one of the major concerns is the influence of the renewable contents on the combustion devices performance. The possible renewable gas content percentage in pipeline also interests policy makers and gas utility companies. The present study investigates on the influence of hydrogen contents on the operating performance of a surface burner, which is widely adopted in industrial, commercial and residential applications. The interactions among heating load, excess air level and fuel contents are studied by a 3-factor13-level experiment design. Evaluated combustion performance characteristics include flame characteristics, burner/exhaust temperature and emissions (NO, NO2, N2O, CO, UHC, NH3). The results showed that hydrogen addition to natural gas slightly increased the burner surface temperature but did not have significant impact on other burner performance parameters. Up to 20% (by volume) natural gas was replaced by hydrogen, and no abnormal effect was observed. Furthermore, tests carried out in a prototype water heater showed similar performance. This study gives a positive sign relative to replacing pipeline natural gas with renewable hydrogen at a low percentage without modifying the burner geometry. 相似文献
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介绍了LYS2液化石油气烧嘴的结构特点和热工特点。它具有空-煤气混合好、调节比大、助烧空气压力低、可用于冷风或热风、适应性强等特点。 相似文献
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《Energy Conversion and Management》2001,42(15-17):1897-1907
A new type of the heat recirculating burner was constructed and its combustion characteristics during steady low-calorific-fuel/air combustion were investigated. Flammability limits of the burner were measured by experiments, and longitudinal temperature distributions of air and burned gas flowing in the passes of the burner were determined by means of both experimental measurements and numerical simulations. Using the heat recirculation rate and the thermal efficiency as criteria for the performance of the burner, the optimal design of the burner was examined in terms of a chemical parameter (the equivalence ratio), a fluid-mechanical parameter (the Reynolds number) and a geometrical parameter (the number of passes). 相似文献