CAJ | 학술논문

受热面积灰对燃煤电站锅炉安全经济运行有着重要影响，本文基于锅炉对流烟道内飞灰颗粒的惯性碰撞沉积特征，分析了受热面积灰增长的物理机理，推导了灰污渐进值与积灰时间常数的函数表达式，建立了受热面松散性积灰增长的数学模型，揭示了沉积准则与灰污增长之间的物理关系。CFD模拟分析表明，对流受热面积灰主要受管排布置和烟气流速的影响，而受飞灰浓度的影响较小。灰污沉积渐进值随管排布置变疏、烟气流速的减小而增加，积灰时间常数随流速的减小而增大。此积灰增长模型可用于锅炉各对流受热面松散性积灰预测，为吹灰优化和锅炉设计等提供理论依据。
수열면적회대연매전참과로안전경제운행유착중요영향，본문기우과로대류연도내비회과립적관성팽당침적특정，분석료수열면적회증장적물리궤리，추도료회오점진치여적회시간상수적함수표체식，건립료수열면송산성적회증장적수학모형，게시료침적준칙여회오증장지간적물리관계。CFD모의분석표명，대류수열면적회주요수관배포치화연기류속적영향，이수비회농도적영향교소。회오침적점진치수관배포치변소、연기류속적감소이증가，적회시간상수수류속적감소이증대。차적회증장모형가용우과로각대류수열면송산성적회예측，위취회우화화과로설계등제공이론의거。
As the fouling on heating surface plays an important role on the safe and economic operation of coal-fired utility boiler, based on the deposition characteristics of particulate inertial collision on convective heating surface of boilers, physical mechanism of fouling growth was studied in this paper. With the development of functions of asymptotic value and time constant of fouling, a mathematical model of looseness fouling growth on heating surface was proposed, which reflects the relation between deposition criteria and fouling growth. Through the CFD simulation, it is concluded that fouling on convective heating surface is mainly influenced by tubes arrangement and flue gas velocity, and seldom affected by the density of fly ash particles. The asymptotic value of fouling increases with the thinning of tubes arrangement and the decreasing of flue gas velocity. And time constant of fouling increases with the decreasing of velocity. This growth model of particulate fouling can be used to prediction of looseness fouling on boilers heating surface and will be contributed to soot blowing optimization and boiler design.