Prediction of coal fouling using an alternative index under the gasification condition

Ash Fusion Characteristics of a High Aluminum Coal and Its Modification

“…The AFT of SJH is very high (DT, ST, HT, and FT are all higher than 1500 °C, respectively). While the AFTs of SM and YM are relatively low (ST, 1150 °C or so), belonging to typical low AFT coal, and slag might be formed during their conversion (e.g., combustion, gasification in fixed-bed or fluidized-bed), which might lead to the shutdown of system. Thus, SM and YM were selected as coal blending to decrease SJH AFT.…”

“…With the increase of environmental pressure (e.g., air pollution, ozone depletion, acid rain, global warming, and their effects on the eco-system 1−3 ), gasification technologies, with superior environmental impact 4,5 have been developed quickly in many countries. 6,7 Among three gasifiers (fixed-bed, 8 fluidized-bed, 9 and entrained-flow bed), entrained-flow bed gasifier has been considered as a promising technology with the advantages of flexibility in feedstock and product, high thermal efficiency and carbon dioxide capture, and a high quality syngas with low tar content due to its operation on higher temperature with smaller coal particles.…”

“…With the increase of environmental pressure (e.g., air pollution, ozone depletion, acid rain, global warming, and their effects on the eco-system − ), gasification technologies, with superior environmental impact , have been developed quickly in many countries. , Among three gasifiers (fixed-bed, fluidized-bed, and entrained-flow bed), entrained-flow bed gasifier has been considered as a promising technology with the advantages of flexibility in feedstock and product, high thermal efficiency and carbon dioxide capture, and a high quality syngas with low tar content due to its operation on higher temperature with smaller coal particles. ,, At a high temperature, the difference of organic matter gasification reactivity is small, the behavior of ash fusion and flow becomes an important factor that affecting the stable operation of gasification . Continuous slag tapping is the key to successful operation on entrained-flow bed gasifier, e.g., the viscosity of 2.5–25 Pa·s is required at the temperatures from 1300 to 1500 °C for Shell gasifier.…”

Understanding mineral behaviors during anthracite fluidized-bed gasification based on slag characteristics

“…The main cause of slag formation during gasification or combustion is the large amount of minerals of alkaline-earth and alkali metals that are produced [23][24][25]. Recently, some indexes for predicting slagging tendency during coal gasification have been proposed on the basis of ash characteristics [26][27][28][29].…”

The melting potential of various ash components generated from coal combustion: Indicated by the circularity of individual particles using CCSEM technology

“…The ash formed by the transformation of inorganic minerals in coal combustion is sufficiently troublesome and severe problems may arise, including slagging, fouling, corrosion and fine particulate matter emissions, etc. [1][2][3][4][5]. To study the ash-related issue, the ash particle formation (i.e., the physical & chemical transformation pathway from coal mineral to ash), particle stickiness (related to the physical melting behavior) and particle transport, are the key processes that need to be carefully considered [1].…”