Abstract
Ash deposition has a major impact on safe and economic operation of coal-fired boiler. A new method for ash melting thermo-analysis based on X-ray diffraction mineral quantitative analysis was developed; the classical thermal analysis theory was used to describe the dynamic behavior of ash melting. The low-temperature ash melting process curve was acquired. Compared with the conventional method of ash fusibility, the new method of ash melting characteristic curve reflects the ash melting dynamic better. The ash melting characteristic curve reveals the multi-stage reaction process of minerals melting, explains the gradual increase of mineral melting process in theory.
Highlights
Ash deposition has a major impact on safe and economic operation of coal-fired boiler
A new method for ash melting thermo-analysis based on X-ray diffraction mineral quantitative analysis was developed; the classical thermal analysis theory was used to describe the dynamic behavior of ash melting
Another defect of this method is that the ash fusion temperatures are just reflecting the melting behavior of ash particles, which is essentially different from the melting behavior of minerals in a boiler
Summary
Even more noteworthy is that only four instantaneous characteristic temperatures can be given by this method, and the transformation process of minerals and real-time behavior of ash particles in the actual boiler can not be predicted [2,3]. The STA thermal curve is transformed to ash melting curve in real-time, which has great significance on the study of dynamic process of mineral partition and melting. The STA method used by Hansen et al was just to characterize the melting of ash which belongs to the second reaction [4] It does not accurately reflect the melting of minerals during coal combustion. The proposed MQTA method in this paper is to first use low-temperature plasma ashing method to separate the inorganic minerals from coal, and conduct the STA analysis of low temperature ash (LTA) to get the TGA-DTA-DSC curves. The peak at about 590°C represents the decomposition of kaolinite and illite, 740°C peak originates from the weight loss of calcite decomposition
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