加热器上端差对煤耗率影响的通用强度矩阵计算模型

定量计算分析加热器上端差变化对火电机组发电煤耗率的影响对节能降耗具有重要的现实意义,为解决以前计算方法的局限性,提出了一种计算上端差改变对煤耗率影响的新方法.以火电机组热经济性分析的统一物理模型和数学模型为基础,借助梯度算子,建立了基于强度矩阵的上端差改变对煤耗率影响的通用计算模型,并对某600MW机组的典型工况进行了计算.结果表明：该模型推导简单、计算量小、精度高且通用性强;强度矩阵可直接用于定性和定量地分析各个加热器上端差改变对机组煤耗率的影响;端差对经济性的影响除了其本身的大小外,还与加热器所处的位置和结构有关,在运行或检修中,更应关注强度系数大的加热器端差变化对经济性的影响.

Influence of Upper Terminal Temperature Difference of Heater on Coal Consumption Rate and its General Strength Matrix Calculation Model

For the purpose of energy saving, it is meaningful to quantitatively analyze the influence of upper terminal temperature difference of a heater on the coal consumption rate in a coal-fired power plant. To overcome the deficiency of previous calculation methods, a general strength matrix calculation model was established with gradient operator based on the unified physical and mathematic model in thermal economy analysis, which was later on applied to the calculation for a 600 MW unit under typical working conditions. Results show that the model has simple structure, less calculation, high precision and strong universality the strength matrix can be directly used to quantitatively and qualitatively analyze the influence of the up- per terminal temperature difference on the coal consumption rate the influence of terminal temperature difference on thermal economy of power plant has a relationship not only to the value of the temperature difference itself, but also to the location and structure of the heater, therefore it is suggested that great at- tention should be paid to the influence of terminal temperature differences with high strength factors on the unit economy.