Isothermal hot air drying behavior of municipal sewage sludge briquettes coupled with lignite additive

Kinetics on the lignite thin-layer during hot air forced convective drying was investigated experimentally as a function of drying conditions (hot air temperature and speed). The experiments were conducted at hot air temperatures of 100, 110, 120, 130, 140, 150, and 160 °C and hot air speeds of 0.6, 1.4, and 2.0 m/s. The drying process of lignite presented a combination of the short warm-up period, the first falling rate period and the second falling rate period. The Midilli model gave a perfect prediction for the lignite thin layer drying. The effective moisture diffusivity of lignite thin layer was from 5.098 × 10 −9 to 1.481 × 10 −8  m 2 /s for the first falling rate period, and from 7.003 × 10 −9 to 1.907 × 10 −8  m 2 /s for the second falling rate period. The hot air temperature and speed had significant effect on the effective moisture diffusivity of the lignite sample ( P

Thin-layer drying kinetics of lignite during hot air forced convection

The microwave drying performance of lignite thin layer in a bench-scale setup was highlighted in terms of three additives with 10% dosage. The dielectric loss for dried lignite, raw lignite, lignite/coal fly ash, lignite/Na2SO4, and lignite/Na2CO3 at 2,450 MHz were 0.06, 0.13, 0.14, 0.15, and 0.18. In comparison with raw lignite, the average temperature rising of the thin layer at 385 W for lignite blending with sodium carbonate, sodium sulfate, and coal fly ash was about 10, 7, and 2°C. The apparent activation energies of both falling rate periods for lignite blending with three additives were less than that of raw lignite. Sodium carbonate among three additives could be preferable one, followed by sodium sulfate and coal fly ash. The energy efficiency increased with the addition of sodium carbonate, sodium sulfate, and coal fly ash. The required electricity energy for lignite/Na2CO3 blend at 385 W was reduced by about one half compared with the raw lignite.

Combined effects of additives and power levels on microwave drying performance of lignite thin layer

The division and geologic controlling factors of a vertical superimposed coalbed methane system in the northern Gujiao blocks, China

Integrated dynamic evaluation of depletion-drive performance in naturally fractured-vuggy carbonate reservoirs using DPSO–FCM clustering

Complex relationship between porosity and permeability of carbonate reservoirs and its controlling factors: A case study of platform facies in Pre-Caspian Basin

Ling He

Papers

Complex relationship between porosity and permeability of carbonate reservoirs and its controlling factors: A case study of platform facies in Pre-Caspian Basin

A study on remaining oil distribution in a carbonate oil reservoir based on reservoir flow units