Thermal performance and numerical simulation of high temperature air combustion boiler

摘要

Thermal performance in the experiments and three-dimensional numerical simualtions for a high temperature air combustion boiler where fuel an be efficiently combusted by high temperature preheated air (800 deg C approx 1000 deg C) are examined. For a MEET I boiler already installed in Tokyo Institute of Technology, there are good agreement for heat transfer to boiler tubes between experiment and numerical simulation for not only non-diluted natural gas also diluted natural gas combustion. Temperature distribution becomes almost uniform, average temperatures are 1349K for natural gas and 1251K for natural gas diluted by argon, respectively. For a scale-up MEET II boiler which can combust not only natural gas but also low calorific gas large-scale (e.g. full gasificatio ngas obtained from coal or wastes) and will be demonstrated since this spring, temperature distribution is very uniform for both left side and diagonal combustion. Averaged temperature in the boiler is about 1300K for each case.