Low-rank coal is difficult to upgrade using conventional flotation methods due to its high hydrophilic properties. Thus, it is necessary to explore new methods for upgrading and utilizing low-rank coal. In this investigation, a gaseous dodecane pretreatment method was used to enhance the flotation performance of low-rank coal. Pore distribution analysis, FTIR (Fourier Transform Infrared ...
@article{osti_6747521, title = {Pretreatment techniques for coal gasification. Sixth quarterly report, January 1-March 31, 1986. [Steam treatment of coal to increase eight liquid yields]}, author = {Graff, R A}, abstractNote = {Pretreatment of coal in steam is being explored with the goal of improving the economic attractiveness of coal gasification by cogeneration of light liquid fuels.
Table 11.4 summarizes common pretreatment techniques, and Table 11.5 lists a number of flocculants and their applications. Some discussion of pretreatment is in Section 11.3. The stable free radicals in coal can adversely affect the 13C signal intensity.
01-09-2017· Some of the available pretreatment techniques include acid hydrolysis, steam explosion, ammonia fiber expansion (AFEX), alkaline wet oxidation, and hot water pretreatment. Besides reducing lignocellulosic recalcitrance, an ideal pretreatment must also minimize formation of degradation products that inhibit subsequent hydrolysis and fermentation.
coal pretreatment techniques and to determine the effect of these pretreatment procedures on the reactivity of the coal. Reactivity enhancement will be evaluated under both direct hydroliquefaction and co-processing conditions. Coal conversion utilizing low rank coals and low severity conditions (reaction temperatures generally less than 350
01-09-2017· Hydrothermal pretreatment of coal. SciTech Connect. Ross, D.S. 1989-12-21. We have examined changes in Argonne Premium samples of Wyodak coal following 30 min treatment in liquid water at autogenous pressures at 150{degrees}, 250{degrees}, and 350{degrees}C. In most runs the coal was initially dried at 60{degrees}C/1 torr/20 hr. The changes were monitored by pyrolysis field …
01-08-2019· Other techniques such as pore compression pretreatment [25], microwave pretreatment [26], ultrasonic pretreatment [27], dry grinding pretreatment [18], low-temperature pyrolysis [28] have been used to enhance the flotation of low-rank coal.
** Chinese National Engineering Research Center of Coal Preparation and Purification, Xuzhou 221116, Jiangsu, China, [email protected] (Y. Wang) Abstract: A new technique for pretreatment of coking wastewater is introduced based on the concept of circular economy. Coal is fed into a …
15-04-2020· After treating by 0.1 M NaOH, methane production reached 216 μmol/g coal which was 5.88% higher than that produced from the raw coal with 204 μmol/g coal. 0.5 M NaOH pretreatment increased methane production by 10.78% with 226 μmol/g coal, while 1.5 M NaOH pretreatment had the largest methane yield with 233 μmol/g coal which was 14.22% higher than that produced from the raw coal.
OSTI.GOV Conference: Effects of pre-treatment techniques on low severity coal liquefaction and co-processing
The results also show that the pretreatment technique consisting of slurrying the coal in the electrolytes used under open-circuit conditions resulted in insignificant (4% ash-free basis, H2S04 electrolyte) to no (—10% ash-free basis, NaOH electrolyte) enhance- ment in coal conversion under subsequent liquefaction step.
Thus, several pretreatment methods have been proposed, e.g. chemical treatment, physical treatment, fungal treatment, and bacterial treatment [10–13], to decrease the complexity of coal and increase the bioavailability of coal, thereby enhancing the bioconversion of coal. Chemical pretreatment is widely studied in the biotransformation of coal.
Pretreatment techniques for coal gasification. Eighth quarterly report, July 1-September 30, 1986. [Pretreatment of coal in steam to increase light liquid yields]
A process for converting a finely divided carbonaceous material, particularly coal, to a fuel gas. A finely divided or pulverized carbonaceous feed material, such as coal, is pretreated at a temperature of about 700° - 800° F in order to destroy the caking properties of a caking coal feed in a fluidized pretreatment zone, or, alternatively to dry a non-caking coal feed.
• The use of low-sulfur coal • Pretreatment of coal for sulfur removal. • In situ sulfur capture during combustion. • Post-combustion treatment of flue gas 2. Sulfur in Coal 2.1 Sulfur Content The total sulfur content of coal can vary within a single deposit as well as between deposits.
Pretreatment techniques for coal gasification. Fifth quarterly report, October 1-December 31, 1985. [Raw and pretreated coal in helium and steam]
15-08-2014· In this pretreatment process, the coal layer thickness and length of stay in the reaction cavity should be controlled, the sulphur-containing gases within the cavity should be exported timely, and it should be ensured that the temperature of the coal sample after pre-treatment was 150–250 °C.
3 for coal pretreatment. Fungi isolated from Chinese coal were able to process coal pretreated in such a way in around 33 % in 11 days, while P. putida was able to solubilize 90 % of coal in 14 days (Machnikowska et al., 2002; Sudong et al., 2009). The presented research shows that F. oxysporum 1101 has a very good biosol-ubilizing ability.
In this regard, fungal degradation of coal can serve as a pretreat- Received in revised form 2 May 2012 ment step in order to make coal a suitable substrate for biological beneficiation. A fungal isolate MW1 ... 89:123–30. Desert area of Pakistan, with the help of some unconventional techniques.
15-02-2020· Hybrid direct coal fuel cells (HDCFCs) have the potential to convert coal into electrical power in a clean and efficient manner. However, the related coal pretreatment method and the anode activity should both be improved, before the HDCFCs could match the performance of other direct coal fuel cells such as those based on solid oxide.
of operation, i.e. physical (microwave) pretreatment of coal followed by biological desulphurization using Thiobacillus ferrooxidans (method 1) and bacterial pretreatment of coal followed by physical technique of oil agglomeration (method 2). Microwave pretreatment of coal did not show any improvement in pyritic
Biomass Pretreatment Techniques. Energy Management. Biomass, whether forestry, agriculture-based, or from other biomass sources requires different pretreatments to make the material useful for specific downstream processing. ... dry solid fuel that contains approximately 90% the BTU content as an equal weight of western coal.
01-03-1991· Utilization of coal pretreatment techniques, including mild alkylation and solvent swelling, has been investigated to determine the effect of these procedures on the reactivity of coal. Alkylation recipes investigated have included both selective (O-methylation, Liotta) and non-selective (Sternberg) techniques, in which the reaction conditions are adjusted to bring about a minimal alkylation ...
coal pretreatment techniques in coal hydroliquefaction by co-processing. The objectives of the project are to investigate various coal pretreatment techniques and to determine the effect of these pretreatment procedures on the reactivity of the coal. Reactivity enhancement will be evaluated under both direct hydroliquefaction and co-processing ...
OSTI.GOV Technical Report: Pretreatment techniques for coal gasification. Third quarterly report, April 1-June 30, 1985
Other techniques such as pore compression pretreatment [25], microwave pretreatment [26], ultrasonic pretreatment [27], dry grinding pretreatment [18], low-temperature pyrolysis [28] have been used to enhance the fl otation of low-rank coal.