Effect of hydrothermal dewatering on the slurryability of brown coals

Influence of the hydrothermal dewatering on the combustion characteristics of Chinese low-rank coals

“…HTD process was performed in a bench scale hydrothermal reaction system (WeiBa WHFS-2), which had a 2-L cylindrical autoclave with the maximum pressure of 25 MPa and the maximum temperature of 350 C [12], as shown in Fig. 1.…”

“…Morimoto et al [11] studied the yield of the products during the HTD process, and found that the upgraded coal showed less oxygen content, higher calorific value, and higher gasification reactivity than the raw coal. Yu et al [12] studied the effect of HTD on the slurryability of brown coals, and found that the maximum solid concentration of coal water slurry increased. Wu et al [13] studied the gas-, solid-, and liquid-phase products obtained after HTD, and analyzed the occurrence of carbon and its migration mechanism during HTD.…”

Upgrading of low rank coal by hydrothermal treatment: Coal tar yield during pyrolysis

“…Recently, many researchers focus on the effect of hydrothermal treatment on gasification of brown coal, hydrothermal treatment has an improvement in the slurryability of brown coal [20][21][22][23] and can reduce the viscosity of the coal-water slurry. Moreover, hydrothermal treatment not only promotes the hydro-liquefaction activity in coal liquefaction [24,25] but also increases the coal concentration of coalsolvent slurry [26], then, the oil production cost of liquefaction process is reduced.…”

Effects of microwave irradiation treatment on physicochemical characteristics of Chinese low-rank coals

“…LRCs have inherent limitations such as high moisture content, low calorific value, and high propensity toward spontaneous combustion. However, the prospective use of LRCs can be enhanced considerably through an upgrading process, among which dewatering is the essential first step [1].…”