低挥发分水煤浆的制备及燃烧特性研究

本文通过干法制浆研究了潞安低挥发分贫煤的成浆性,通过热重分析和燃烧试验研究了低挥发分水煤浆的燃烧特性。研究结果表明:屯留原煤、屯留煤泥、常村原煤和常村煤泥的成浆性很好,可制备出浓度高达72%、表观黏度小于1 200 mPa·s的水煤浆。水煤浆的热重试验和燃烧试验表明:常村低挥发分贫煤水煤浆的着火温度较高,综合燃烧特性指数低于高挥发分水煤浆；在相同的升温速率下,低挥发分水煤浆的活化能高于高挥发分的水煤浆,灰渣沉积速率远低于高挥发分水煤浆的灰渣沉积速率,结渣不严重；10 t/h锅炉上连续燃烧常村煤泥水煤浆时,火焰明亮、稳定,炉膛充满度高,炉膛温度均匀；无任何闪烁火星出现,达到了很高的燃尽率,燃烧热效率高达86.93%。

A study of low volatile coal water slurry-preparation and combustion

This exploratory work focused on the preparation of coal water slurry from low volatile coal and its combustion characteristics. Sample of raw coal and coal slime (Tunliu&Changcun, Luan Ltd, Shanxi, CN) were ground and prepared into high concentration coal water slurry (CWS), which could be up to 72% and the apparent viscosity was less than 1 200 mPa·s, showing a good slurryability of the sample. Then thermo gravimetric analysis (TGA) and combustion test were conducted and the result showed that sample from Changcun had a comparatively higher ignition temperature, while a lower combined combustion characteristic index compared to the high volatile CWS. Under the same heating rate, a higher activation energy was required for low volatile CWS, while its ash deposition rate was well below that of high volatile CWS. When combusted continuously in a 10t/h industry boiler under the condition of national emission standards, the Changcun CWS was well distributed in the furnace with a uniform temperature, a bright, stable and sparkless flame, and the burn-out rate was high with a combustion thermal efficiency of 86.93%.