Measurements of fuel burn rate, emissions and thermal efficiency from a domestic two-stage wood-fired hydronic heater
Measurements of fuel burn rate, emissions and thermal efficiency from a domestic two-stage wood-fired hydronic heater
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家用两级燃木液体循环加热器的燃料燃烧率、排放和热效率的测量
DOI：
10.1016/j.renene.2016.04.096
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发表时间：
2016
期刊：
影响因子：
8.7
通讯作者：
P. DesJardin
中科院分区：
文献类型：
--
作者：
J. P. Richter;Brian T. Bojko;J. Mollendorf;P. DesJardin
对一台两级式燃木循环热水器进行了实验研究。WFHH包含两个燃烧室。第一个主要与木材热解有关，而位于下游的第二个则设计用于不希望的排放物的二次燃烧。开发了一种基于压电称重传感器的装置，以获得燃料燃烧率（FBR）的直接测量值-避免用于认证的标准化（全设备称重）方法可能的不准确性。为了检查实验测量的内部一致性，理论质量损失关系的开发和用于减少数据和解释的物理机制负责实验观察到的全球最大燃烧速率的存在。一个系统级的数值模型，也开发了一个良好的搅拌反应器理论和化学平衡相结合的基础上，提供烟道排气产品和温度的估计。实验和模型预测之间的总体协议是合理的温度和主要燃烧物种。温度/当量比状态空间内的实验排放图被用来演示该WFHH的当前操作路径。测量的平均热效率在48- 55%的范围内。这些测量被认为是内部自洽的，并提供更完整的理论研究的指导。
An experimental study is conducted of a two-stage wood-fired hydronic heater (WFHH). The WFHH contains two combustion chambers. The first is associated primarily with wood pyrolysis while the second, located down stream, is designed for secondary burning of undesirable emissions. A piezo-electric load cell based apparatus is developed to obtain direct measurements of fuel burn rate (FBR) - avoiding possible inaccuracies of standardized (full appliance weighing) approaches used for certification. To check the internal consistency of the experimental measurement, a theoretical mass loss relation is developed and used for reducing data and to explain the physical mechanism responsible for the existence of the experimentally observed global maximum burn rate. A system level numerical model is also developed based on a combination of well-stirred reactor theory and chemical equilibrium to provide estimates of flue exhaust products and temperature. Overall agreement between experiments and model predictions are reasonable for temperature and major combustion species. Experimental emissions maps within a temperature/equivalence ratio state space are used to demonstrate the current operating path for this WFHH. Average thermal efficiencies are measured in the range of 48–55%. These measurements are found to be internally self-consistent and provide guidance for more complete theoretical studies.