多指数法和Dutton图形互换性预测方法对我国的适用性说明  

Applicability of Multiple Indices and Dutton Diagrammatic Methods for Gas Interchangeability Prediction Used in China

作　　者：张杨竣[1] 秦朝葵[2] 

机构地区：[1]天津大学环境科学与工程学院,300072 [2]同济大学机械与能源工程学院,201804

出　　处：《城市燃气》2016年第1期4-11,共8页Urban Gas

摘　　要：针对燃气互换性问题,上世纪美国和欧洲等国家投入了大量的时间、人力和物力进行研究,并基于经验判断、理论分析、实验观察以及联合各种方法进行系统研究,提出了各种各样的燃气互换性预测方法,但尚未有一套完整且完全适用各国情况的方法可用于实际应用。美国提出的AGA和Weaver多指数法,形成背景不仅仅限于天然气之间的互换,而是针对不同类别燃气之间的互换,所选实验燃气气质特性与现有天然气差别较大,且所针对的燃烧器结构和设计参数与我国设备差距较大;英国Dutton图形法将天然气划分为4种当量组分,以华白数为纵坐标、定义PN数为横坐标,建立互换性预测图形,然而,每种极限工况下的当量换算并不采用同一换算公式,且换算后气体组分与原组分燃烧特性表现实质上存在差异,如离焰和CO排放在针对我国燃气具结构特点时,是否可以完全复现原燃气表现存在疑问。由于各方法研究时针对的燃气种类和燃烧器均与我国情况不同,且各方法提出的机理受条件限制,当应用于我国现阶段天然气互换性预测时,应做相应的实验研究和科学验证。In last century, USA and Europe had spent a lot of time, manpower and resources to carry out research on gas interchangeability, and concluded various prediction methods based on experiential judgment, theoretical analyses, experimental test as well as combined different research approaches. But by the practical application of different prediction methods, it does not exist one common method which can be totally used around world. The research gas sources of AGA and Weaver indices not only included natural gases, but also were about different gas families, moreover the properties of gas samples were really different from nowadays＇ natural gases in China, otherwise the structure and design parameters of experiment sample appliances were varied hugely with Chinese gas appliances. Dutton diagrammatic method classified the natural gas components into four equivalent components, and built up the interchange prediction diagram by defining Wobbe Index as vertical axis and PN as horizontal axis. But the change methods of equivalent component during different limit combustion conditions were different and it was hard to determine the same combustion performance before and after equivalent component change of gases. Such as for Chinese gas appliances, the lift flame characteristic and CO emission performance are uncertain all the same when they are operated under the original gases and equivalent components gases, respectively. Because the research gas sources, the structure of end-use appliance and the conditional limits of application of each gas interchangeability prediction method are different from Chinese gas industry situation, if it is used directly to predict Chinese gas interchangeability, it seems like not very scientific and may be still cause gas interchangeability problems.

关 键 词：燃气互换性 预测方法 适用性 多指数法 图形法 

分 类 号：TU996[建筑科学—供热、供燃气、通风及空调工程]