Char Pressurized Combustion Characteristics Of Study

The second generation PFBC-CC, which was developed on base of the first generation, is a significant clean-coal conversion technology. Semi-coke is production of gasifier, its combustion efficiency directly influenced power generation efficiency of the total system. This paper carried out a general research on combustion behavior of semi-coke with the aid of pressurized thermogravimetry, which is developed by ourselves.This paper ameliorated the old thermogravimetry, redesigned the structure of analytical balance , improved data acquisition and digital signal process system. Moreover, we replaced the double-hearths structure with one-hearth double-crucibles structure. All the experimental datum proved that the reconstructive system have better measurement precision, veracity and repeatability than the old one.This paper researched rules of ignition and combustion stability under pressurized environment, discussed how to calculate ignition temperature, and also studied the effects of many factors, such as categories of semi-coke, total pressure, oxygen concentration, particle size, heating rate, on ignition character. On base of pure carbon combustion test data, combustion stability parameter R. was proposed to evaluated combustion stability .Combustion character of semi-coke was studied under pressurized circumstance. The TG-DTG curves of combustion process, which were gained under different pressure, oxygen concentration and particle size, were analyzed in detail. This paper also studied effects of categories of semi-coke, total pressure, oxygen concentration, particle size and heating rate on maximum mass loss-rate, burning time, burn-out temperature, and described the dynamic transformation of combustion reactivity of semi-coke under different testing condition. Mean mass reactivity parameter was proposed to evaluate combustion reactivity of semi-coke.Integral method and linear regress in section method were adopted to calculate reaction progression and activity energy respectively. According to kinetic parameters calculated above, an equation of combustion rate was established to forecast combustion process of semi-coke.