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Pressure excursion after fame out is an important but a less reported issue in large-scale tangentially fired boilers, since they endanger largely boilers operation. Simulations are conducted in this paper to study the issue. Perfect agreement between the simulation results and key boiler design values and available site operation records indicates that the calculations are reliable. Based on the simulations, effect of some factors, including temperature, gas content, rample trip fuel time and boiler load, on pressure excursion are studied in details. The most important cause and how it affects the temperature deviation are located. Some of new conclusion is concluded from paper.