Power Plant Boilers Burning Coal-water Slurry Slagging, Heat Transfer And Pollutant Emission

Coal is the main energy in China's energy structure. But the large quantity exploitation of coal and low efficiency consuming bring serious pollution of the environment . Coal-water slurry is a new type of clean fuel as a replacement for oil. This paper introduces the tests of Maoming No.2 oil-fired 220 t/h utility boiler being retrofitted to fire coal-water slurry, including slagging tendency, heat transfer performances and pollutant emissions.Firstly the k-?two-equation turbulence model is used in numerical simulation for the side-air burner, compared with the practical measures and tests, good accordance achives. This method can bring great convenience in analyzing aerodynamical field of boiler. Secondly the method of XRD is used in analyzing the phase transformation in the course of dynamic slagging test, so we can describe the process of slagging comparatively accurately. Last this paper introduces a kind of fuzzy mathematics model which comprises an assemblage combined by seven change factor. This model correctly judges the slagging tendency of a kind of coal-water slurry.Measurements are taken of the temperature field, flame emissivity, superheater tube wall temperature, exhaust gas temperature and composition. These data represent some special features of coal-water slurry combustion and may serve as reference data during the design and retrofitting of a boiler for firing coal-water slurry.