Algorithm for boiler hydrodynamic calculation based on basic loop adjustment by flow regulation

Boiler hydrodynamic calculation mainly adopts graphic method,which is quiet complicated and tedious for solving complex boiler systems and sometimes difficult to obtain accurate results. For making up the insufficiencies of graphic method,a general algorithm for boiler hydrodynamic calculation based on basic loop adjustment by flow regulation was presented. First,a directed graph calculation model composed of "nodes" and "resistance sections" was established,and the flow continuity equations of nodes and resistance balance equations of basic loops were provided based on the model. Second,the successive iteration method was used for solving the equations. Considering the influence of heat and gravity,the solving procedure was divided into two stages,i.e.,rough flow regulation and refined flow regulation. Different adjustment strategy was implemented in each stage to reduce the resistance closure of each basic loop gradually until the solution was convergent. The algorithm is independent with the flow topology structure and suitable for hydrodynamic calculations of various configuration boilers. Practical applications show that the proposed algorithm has excellent generality and is easy to be programmed; moreover,both the accuracy and the speed of calculation are greatly improved.