共查询到19条相似文献,搜索用时 187 毫秒
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轻烃燃气是由轻烃燃料和空气混合而成,由于其性质与液化石油气混空气相近,相对价格较低,不失为将来与天然气接轨的一种过渡燃气。作者通过对轻烃燃气输配系统的技术分析后认为,轻烃燃气只适合于小规模、低热值燃气供气。若供气规模过大,则经济性会变差;为使热值稳定,冬季和夏季的燃气出厂压力差异极大,将对输配系统带来较大的问题;冬季供应压力低,有碍于燃气管网的安全。 相似文献
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介绍了混合燃气成本最优化控制系统以及实施方案,在满足燃烧特性要求的前提下,最大限度降低混合燃气的生产成本。 相似文献
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采用流固耦合算法,建立6种体积甲烷-空气混合燃气在综合管廊内发生爆炸的有限元模型,计算空气冲击波峰值压力、混凝土管廊的应力和位移时程曲线.并对各空气单元的压力峰值进行统计分析,提出相同燃气体积距燃气边缘不同距离的空气冲击波超压峰值曲线的数学解析式.对6种工况下管廊内距燃气边缘不同距离的空气冲击波超压峰值进行拟合,提出不... 相似文献
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城镇燃气输配系统压力分级与低压管道压力降,是燃气输配系统中的重要问题。本文就城镇燃气设计规范修订中对这两个问题的调查研究做简要的论述。 一、燃气输配系统的压力分级 城镇燃气输配系统的压力与级制,对整个输配系统的经济合理、安全可靠具有敏感的影响。因此,在设计中对输配系统压力与 相似文献
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从燃气系统的参照标准、燃气质量、供气压力、燃气的计量与过滤等方面介绍了直燃机组的设计要求,阐述了管道及附件的安装方法,提出了城镇燃气的有关设计规范,以保证直燃机安全运行。 相似文献
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本文将用户调压器的结构参数与燃气管网的特点联系起来,应用概率统计方法,使设计出的用户调压器流量特性与管网的压力一流量特性相适应,从而保证了燃气用具处压力的稳定性,并得出了某一典型调压器结构参数之间的最佳匹配关系。 相似文献
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关于民用燃气燃烧器火焰稳定问题的探讨 总被引:1,自引:1,他引:1
关于民用燃气燃烧器火焰稳定问题的探讨夏昭知(重庆建筑大学,重庆630045)关键词燃气燃烧器火焰稳定性燃具设计中图分类号TU996.751引言在民用燃具的有关标准中,明确要求燃气燃烧器在(0.5~1.5)倍燃气额定压力下工作时不得出现回火与脱火。由... 相似文献
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为了提高燃烧控制精度,要求对燃料天然气热值进行精确控制。通过向天然气中掺混空气调整天然气热值,采用前馈控制和串级控制调整混合气热值,混合气热值可控制在(34.6±0.1)MJ/m3。 相似文献
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燃气器具燃烧过剩空气系数计算的研究 总被引:1,自引:0,他引:1
文章主要论述了燃气器具燃烧过剩空气系数的计算方法,介绍了不同过剩空气系数计算公式的使用范围,并举例天然气、液化石油气和人工煤气三气种燃气器具在测得烟气中相同氧含量时过剩空气系数的计算方法,以及过剩空气系数对燃气器具在燃烧过程中消耗空气量和同时产生烟气量的影响。 相似文献
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The structural air compressor has heavy power consumption during the course of operation, so the energy conservation control is one of the major challenges in the research of its control mechanism. In this paper, a co-operative control mechanism based on the gray prediction is proposed to control the air supply flow of the air compressor. The air supply flow of each air compressor is sent to the main gas tank, and dozens of pneumatic rock drills are driven by the high pressure gas of a main pipeline connected to the main gas tank. According to the real-time measurement and analysis of the pressure of the main gas tank, the controller predicts the next value of the pressure and dynamically regulates the working time of each air compressor. With the control mechanism, the pressure of the main gas tank is smooth and the total working time of the air compressors is reduced. The statistical results demonstrate that the presented control mechanism can effectively reduce about 22% energy consumption of the air compressor. 相似文献
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喷雾蒸发冷却技术在钢厂转炉和电炉烟气处理工程有广泛的应用,对于喷雾蒸发机理的研究是建立在单个水滴蒸发的研究基础之上的。设计了实验装置,并根据实验装置利用FLUENT软件对实验工况进行了数值模拟,研究了气体温度、初始直径对喷雾水滴颗粒的影响,以及水滴温度和蒸发率随时间的变化关系,研究发现在高温空气中实验值与模拟值近似,而... 相似文献
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ABSTRACTPresently biodiesel is widely used globally due to high scarcity of petroleum products and being a renewable fuel which can be used with the current fuelling infrastructure in an unmodified diesel engine. It is a harmless, recyclable, and ecofriendly fuel (reduces air pollutions such as dust, particulates, carbon monoxide, hydrocarbons, and oxides of sulphur and air toxics). In India, the favourable conditions for the growth of Jatropha exist. Its use a biofuel is going to prove very beneficial for the Indian as well as the world market with the increase in fossil fuel’s demand and its reducing availability. The only drawback in using jatropha oil as a fuel is that the NOx emission is more than that of petroleum diesel. This paper deals with the implementation of exhaust gas recirculation to reduce the emission of NOx and to study its characteristics with respect to the performance of the engine.Abbreviations: HSD: high-speed diesel; BD: biodiesel; EGR: exhaust gas recirculation; NOx: nitrous oxide; CO: carbon mono oxide; NaOH: sodium hydroxide; RCAC: Rural Action Community Action Center 相似文献
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In this study, the optimum air layer thickness of double-glazed windows is determined using the degree-days method. Calculations are obtained for ?skenderun, Kocaeli, Ankara and Ardahan which are in different climate zones of Turkey. Heating cost of the objective function is calculated for natural gas, coal, fuel-oil, electricity and LPG. The optimum air layer thickness is obtained for three different base temperatures which are 18, 20 and 22 °C. The results show that the optimum air layer thickness varies between about 12 and 15 mm depending on the climate zone, fuel type and base temperature. The effect of the fuel type and the base temperature on the optimum air layer thickness diminishes in cold zones. It is shown that with a well-optimized glazed window, up to 60% energy saving can be achieved. 相似文献
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对北京市的富康油气(汽油、LPG)两用出租车、索纳塔LPG单燃料出租车的用气指标进行了统计计算,对两种车型的平均加气间隔时间、空调开关情况对用气指标的影响、故障原因与发生频率、已行驶里程与耗气量的关系进行了分析,对比了LPG汽车与燃油汽车单位行驶里程的燃料费。富康车的用气指标为每100 km耗液化石油气8.86 L,索纳塔车为12.06 L。燃油汽车每100 km的燃料费为LPG汽车的1.35倍。 相似文献
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催化燃烧是一个异相氧化过程,它的优点在于燃烧的排放接近零污染,燃气与空气之间的比例关系对系统的辐射效率有相当大的影响。通常燃料选择天然气,本文对贫天然气/空气混合物在催化燃烧炉中Pt催化剂中毒特性和辐射效率进行了研究,分析了由于天然气中H2S的出现导致Pt催化剂的老化。 相似文献