自然循环热水锅炉水动力回路分析法的计算原理

1前言自然循环热水锅炉在我国得到了广泛的应用。为了保证热水锅炉的安全运行,必须对其进行水动力计算。长期以来,自然循环热水锅炉水动力计算使用的方法是图解法[1],该方法将锅炉受热面划分成若干个管组,假定每管组内的各单管具有相同的热负荷和结构参数,然后对各个管组进行水

Principle of Calculations for Hydrodynamic-loop Analysis Method Used for Natural Circulation Hot Water Boilers

Over a long period of time a graphic method has been used for the hydrodynamic calculation of natural circulation hot water boilers,which involves a relatively large calculation error,thus affecting the hydrodynamic safety of boilers.The principles of calculation for hydrodynamic-loop analytic method is expounded in detail.Also given for natural circulation hot water boilers are the equivalent pipeline chart of hydrodynamic-loop analytic method for water walls and convection tube-bundle circulation loops,hydrodynamic-calculation mathematical equations set and their corresponding mathematical solution method.The adoption of hydrodynamic-loop analytic method can not only enhance the reliability of natural circulation hot-water boiler hydrodynamic calculation and guarantee the hydrodynamic safety of hot water boilers but can markedly enhance the calculation efficiency due to the use of a computer-based numerical solution.Moreover,to facilitate the application of the hydrodynamic-loop analytic method for performing the hydrodynamic calculation of the above-cited hot water boilers,through a derivation process given are the equivalent pipeline charts of the hydrodynamic-loop analytic method of a water-wall circulation loop for other commonly seen natural circulation hot-water boilers.In addition,also presented are the hydrodynamic-loop analytic method for the said boilers,the calculation method and operational procedures of hydrodynamic working points for the boiler as a whole.