Development of a Thermal-Hydraulic Analysis Program for Furnace Water Wall Tubes of Pulverized Coal-fired Boilers

摘要

For the advanced designs of the furnace water wall of pulverized coal-fired boilers, we have developed a thermal-hydraulic analysis program to calculate the flow rate and wall temperature distribution in the water wall. The program can be applied to a complex flow network consisting of many tubes and headers for the both steady and transient states in the distributed parameter system. This program can steadily and quickly calculate detailed flow conditions and metal temperature at any tube position. The results of 3-D combustion analysis are used as boundary conditions for thermal hydraulic analysis of the water wall tubes. The program uses a matrix method that gives the revised pressure of each header to conserve mass. With collaboration from Babcock-Hitachi K.K. Kure division (BHK), we verified the analysis accuracy using the steady-state data of temperature distribution in the furnace water wall tubes of an actual boiler. The flow network consists of 55 headers and 151 tube groups that represent about 1500 tubes by grouping about ten tubes per group.