ボイラ火炉水壁管内の分布定数系熱水力解析コードの開発(流体工学,流体機械)  [in Japanese] Development of a Thermal-Hydraulic Analysis Code in the Distributed Parameter System for Furnace Water Wall Tubes of Fired Boilers(Fluids Engineering)  [in Japanese]

For design optimization of the furnace water wall of pulverized coal-fired boilers, a thermal-hydraulic analysis code to calculate the flow rate and wall temperature distribution in the water wall has been developed. The code can be applied to complex flow networks for two-phase flow consisting of many tubes and headers for both steady and transient states in the distributed parameter system. The detailed flow conditions at any tube position, such as temperature, quality, velocity, etc. can be calculated stably and quickly by the developed algorithm using a matrix solver. The results of 3-D combustion analysis are used as one of the boundary conditions for this code. The performance of the code was verified using steady and transient states data of temperature distribution in the furnace water wall tubes of actual boilers. The results of both steady and transient states analyses showed good agreement with measured data. The new algorithm decreased the calculation time for steady-state analysis significantly compared with the previous algorithm. For transient-state analysis with a high performance computer, it can calculate tube temperature faster than the real transient time.