Synthetic and coal-water fuels improving is the instrument of industrial region sustainability increasing
01 Feb 2021-Vol. 258, pp 11002
TL;DR: In this article, the authors discuss the currently used technologies for the production of synthetic and coal-water fuels, identify their main disadvantages and limitations, and propose a schematic diagram of a technological line for coal water fuel production with a linear layout.
Abstract: New methods of processing bituminous and brown coal in synthetic and coal-water fuel production are now gaining relevance. On the one hand, this is dictated by the pragmatic need to reduce the dependence of industrial energy consumers on the prices and quality of hydrocarbon raw materials, especially in the context of the constant exacerbation of market restrictions associated with the pandemic and sanctions, on the other hand, there is an urgent need for environmentally friendly methods of using synthetic and coal-water fuels. The article discusses the currently used technologies for the production of synthetic and coal-water fuels. The authors identify its main disadvantages and limitations and propose a schematic diagram of a technological line for coal-water fuel production with a linear layout. It allows obtaining fuel with good fluidity and higher stability, high-calorie content, and low ash content with less energy consumption.
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TL;DR: In this article, the conceptual design of a base case power-to-liquids (PTL) process that converts CO2 to liquid fuels and a hybrid PTL/power-togas (PTG) process was carried out by using an Aspen Plus simulator.
Abstract: The conceptual design of a base case power-to-liquids (PTL) process that converts CO2 to liquid fuels and a hybrid PTL/power-to-gas (PTG) process that converts CO2 to liquid fuels and high-calorie synthetic natural gas (SNG) was carried out by using an Aspen Plus simulator. Based on the established process models, we conducted a technical study to investigate the effects of recycle ratios on the process performance such as the energy efficiency and the net CO2 reduction of the proposed hybrid PTL/PTG process, and compared it with the base case PTL process. After the technical study, an economic analysis was further implemented to evaluate the economic performance of the hybrid PTL/PTG and the base case PTL processes and to pursue the optimum process configuration of the proposed hybrid PTL/PTG process. According to the results of the technical study and economic analysis, it can be concluded that both the base case PTL process and the hybrid PTL/PTG process can be regarded as candidate technologies for the conversion of CO2 to value-added liquid fuels and/or high-calorie SNG. Moreover, the hybrid PTL/PTG process seems to be more efficient and profitable in utilizing CO2 because of its higher energy efficiency and net CO2 reduction as well as lower CO2 reduction cost in comparison with the base case PTL process.
47 citations
TL;DR: In this article, the results obtained through the development and substantiation of the parameters of the biomass processing technology in a high-calorie solid fuel for boiler units were shown through the analysis of a mixture of Siberian wood (birch, pine, and aspen) and peat of Kandinsky deposit.
36 citations
TL;DR: In this paper, the effects of dispersants, such as Naphthalene Sulfonate Formaldehyde condensate (NSF), Polyoxyethylene Polycarboxylic acid ether (PPA), and Sulfated Melamine-Formaldehyde resin (SMF), on the rheological properties of coal water slurry were investigated.
Abstract: To improve the efficiency of the gasification or combustion process of coal water slurry (CWS), it is significant to optimize the rheological properties and increase the solid concentration of CWS. Particularly, preparing CWS from low quality coal remains a peculiarly intriguing subject due to the large reserve and low price of low quality coals in China and very successful industrial applications of CWS all over the world. In this work, refined coal particles were obtained by applying an improved fine particle flotation method on a low quality coal. The refined coal used for CWS preparation had a much lower ash content and higher calorific value than those of the raw coal, which could hardly be utilized for preparing a qualified CWS in basic fluidity. The CWS derived from the refined coal had a good fluidity, with apparent viscosity of 1045.75 mPa s and solid concentration >60 wt% in dispersant free conditions. The effects of dispersants i.e., Naphthalene Sulfonate Formaldehyde condensate (NSF), Polyoxyethylene Polycarboxylic Acid ether (PPA), and Sulfonated Melamine-Formaldehyde resin (SMF), and their dosages on the rheological characteristics of CWS prepared with the refined coal had been investigated. Experimental results showed that slurry ability for CWS was obviously improved by using the refined coal. This was due to the decrease in both the porosity and hydrophilicity of coal particles as confirmed by SEM and FT-IR analyses. The apparent viscosity of CWS was decreased by 30%–60% by adding one of those dispersants with a dosage of 0.6 wt%. Through observation of the rheological behaviors, the CWS samples generally behaved as a shear thinning fluid, and the measured viscosity was well correlated by the Herschel–Bulkley equation. The PPA dispersant exhibited the best performance on reducing the viscosity and yield stress among the dispersants in this study. It could be attributed to the best improvement in wettability of the coal surface and the largest decrease in surface tension of deionized water by PPA. The electrostatic force might have little contribution to viscosity reduction of CWS in this suspension.
19 citations
TL;DR: In this article, the most favorable process parameters of preparing coal-water suspensions were as follow: q. s. coal with sodium methacrylate as an additive in an amount of 8.0 ǫ g/kg and 60 min milling time.
16 citations
TL;DR: In this paper, high ash coal samples are treated hydrothermally in a 15 l (liters) lab scale autoclave at a temperature of 394 K and residence times of 30, 45, 75 and 120 minutes.
Abstract: The crushed and sieved high ash coal samples are treated hydrothermally in a 15 l (liters) lab scale autoclave at a temperature of 394 K and residence times of 30, 45, 75 and 120 minutes. The hydro...
6 citations