CAJ | 학술논문

针对超超临界锅炉水冷壁节流孔板结垢问题，建立了节流孔板的数值计算模型，分析了结垢的主要原因以及孔板结构参数对结垢程度的影响．在大量数值计算的基础上，采用BP人工神经网络建立了孔板结构参数与结垢程度之间的关系模型并采用遗传算法进行结构优化，得到节流孔板的最佳结构参数．结果表明：节流孔板处压力突降造成磁性氧化铁的析出并沉淀是节流孔板结垢的主要原因；节流孔板的入口倒角、出口倒角、孔径和厚度等结构参数对孔板壁面附近的最大压降幅度和孔板节流效果的影响不同，孔板的厚度越小越好，出口倒角对结垢几乎没有影响，而孔板的孔径和入口倒角对结垢程度影响较大；得到的最佳孔板尺寸参数为孔径9．54mm，入口倒角35°。
침대초초림계과로수랭벽절류공판결구문제，건립료절류공판적수치계산모형，분석료결구적주요원인이급공판결구삼수대결구정도적영향．재대량수치계산적기출상，채용BP인공신경망락건립료공판결구삼수여결구정도지간적관계모형병채용유전산법진행결구우화，득도절류공판적최가결구삼수．결과표명：절류공판처압력돌강조성자성양화철적석출병침정시절류공판결구적주요원인；절류공판적입구도각、출구도각、공경화후도등결구삼수대공판벽면부근적최대압강폭도화공판절류효과적영향불동，공판적후도월소월호，출구도각대결구궤호몰유영향，이공판적공경화입구도각대결구정도영향교대；득도적최가공판척촌삼수위공경9．54mm，입구도각35°。
To solve the fouling problems occurring in throttle orifice for ultra supercritical boiler water walls,, numerical calculation models were set up to analyze the fouling causes and the influence of structural parameters on the fouling degree. A relational model between the structural parameters and fouling degree was established based on a large amount of calculation and using BP artificial neural network, with which optimal structural parameters were obtained by using genetic algorithms for minimum fouling of the ori- fice. Results show that the precipitation and deposition of magnetic oxide iron caused by sudden pressure drop near the orifice plate are found to be the main reasons of orifice fouling~ the influence of following structural parameters on the maximum pressure drop amplitude and throttling effect may be different a- round the orifice plate: such as the inlet angle, outlet angle, pore diameter and length of the orifice, etc. ; the shorter the orifice length, the better the performance effect; the outlet angle hardly affects the orifice fouling, but the inlet angle and pore diameter play an important role in influencing the fouling degree~ the optimal parameters of orifice plate are determined to be 9.54 mm for the pore diameter and 35° for the inlet angle.