1. Introduction. Lowrank coal catalytic microwave pyrolysis has attracted considerable attention among researchers to improve the yields and quality of pyrolysis products and considerably reduce the energy efficiency of pyrolysis reaction [1], [2], [3], [4].In general, the key to efficient chemical processes is the control of the rates of reaction, which is usually provided by a catalyst that ...
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Chemical products are ubiquitous in modern society. The chemical sector is the largest industrial energy consumer and the third largest industrial emitter of carbon dioxide. The current portfolio of mitigation options for the chemical sector emphasizes upstream "supply side" solutions, whereas downstream mitigation options, such as material efficiency, are given comparatively short shrift ...
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China's unique energy reserve structure abundant in coal and scarce in crude oil and natural gas has promoted heavy investment on the research and development of clean coal chemical technologies during last two decades, which has turned China into a heartland for demonstrating, developing, and commercializing virtually every aspect of new coal chemical process technologies. Consequently ...
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The average production of gangue accounts for 1015% of raw coal production [4,5], making coal gangue one of the biggest solid wastes in China. At present, utilization ratio of coal gangue can reach about 60% in some countries. ... 2019 A novel process to extract alumina and prepare FeSi alloys from coal fly ash. Fuel Process. Technol. 185 ...
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Clean coal technologies (CCTs) are a new generation of advanced coal utilization processes that are designed to enhance both the efficiency and the environmental acceptability of coal extraction, preparation, and use. From: Gasification for Synthetic Fuel Production, 2015 Natural Gas Lignite View all Topics Add to Mendeley About this page
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So upgrading usually consists of grinding the coal and then putting into a number of froth floatation cells and cyclones in this process, the rock particles are heavier than the coal so the rock sinks and the coal floats on the surface, The coal is then skimmed off, dried to some extent and then put in train cars. Mine mouth coal for power ...
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As shown in Figure 1, domestic coal production and consumption volumes had been high from 2011 to 2020, with figures of 3,902 million tons (Mt) and 4,040 Mt in 2020, respectively. In addition, China also imported a considerable amount of coal to meet its domestic demand. Such a figure reached 303 Mt in 2020.
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In this study, the characteristic temperature of coal spontaneous combustion, the generation law of indicator gases, the combustion process, and the division of the combustion stages of coal samples taken from Hongqingliang (HQL) and Dayan (DY) mines were investigated using thermogravimetric analysis experiment, indicator gas detection experimen...
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The production of coal gangue will rise considerably as the rapid increase of energy demand, indicating a considerable opportunity for the use of coal gangue. ... Fuel Process. Technol. (2004) B. Ma et al. The compositions, surface texture, absorption, and binding properties of fly ash in China. Environ. Int. (1999) D. Maizel et al.
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Integrated coal production and gas extraction must be considered as a system which involves the exploration and measurement of stress field redistribution, deformation and failure of coal and rock, gas pressure and permeability, and gas desorption and migration during the process of coal mining. Fundamental theory
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Silica aerogel materials are well recognized for their superinsulation performance and are regarded as one of the hot candidates to revolutionize building insulation. To date, high production cost related to exorbitant precursors as well as cumbrous multistep hydrophobization process has often narrowed the field of applications. In this work, granular silica aerogel materials were synthesized ...
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A heat integration optimization method that considers the changes in process parameters is proposed to find the global optimal process scheme for a coal chemical company's phenols and ammonia recovery process. The phenols and ammonia recovery process is simulated by Aspen Plus, and a programming method for heat exchanger networks synthesis that can simultaneously optimize process parameters ...
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According to the accurate model, the simulation for ZLD of fixedbed coal gasification wastewater treatment process is established, and this process is assessed from the perspective of thermodynamics, economy, and environment. The total energy consumption of ZLD process before optimization is × 10 8 W. The results of exergy analysis show ...
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Semantic Scholar extracted view of "A proposed coaltomethanol process with CO2 capture combined Organic Rankine Cycle (ORC) for waste heat recovery" by Liu Xia et al. ... (NGCC) of a novel process for H2 production using a chemical CaCu loop was proposed. This process is based on the sorptionenhanced reforming process . Expand. 43.
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Coke chemical companies often have a deficit of coals of particularly valuable grades, the coking coals. This work studies the opportunity of producing petroleum coking additives using delayed coking during heavy petroleum residue processing. Experiments for the production of a carbon material were conducted using three kinds of heavy petroleum residues of the oil refinery plant Ltd Kinef: the ...
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In recent years, several scholars [2,3,4,5,6,7,8,9,10,11,12,13,14] have studied coal mine accident statistics and analysis of different periods from various angles, but they are not comprehensive example, Huang et al. [] conducted a multiple regression analysis on safety production and economic and social et al. [] discussed the relationship between coal prices and ...
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In this paper, a novel highefficiency coal gasification technology is proposed in which a regenerative unit is applied to recover syngas sensible heat to generate steam; then, the hightemperature steam is used to gasify coke from a pyrolyzer. Through such a thermochemical regenerative unit, the sensible heat with a lower energy level is upgraded into syngas chemical energy with a higher ...
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Coal is presented as a fuel with complex chemical properties due to its fossil fuel nature. The devolatilization process of coal is investigated with special attention to the best models that...
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Coal gasification in supercritical water is a typical carbonbased fuel conversion process in water phase, and it takes the advantages of the unique chemical and physical properties of supercritical water to convert organic matter in coal to H2 and CO2. N, S, P, Hg and other elements are deposited as inorganic salts to avoid pollution emission.
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In addition to the importance of pyrolysis in coal processing, analysis of pyrolysis products can supply important clues to the structure of the parent coal, especially since many of its structural elements are preserved in the heavy volatile products (tar). Keywords Furnace Temperature Coal Particle Bituminous Coal
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In addition, the coal to methanol (CtM) process and the CtSNG process have several identical units (, air separation, coal gasification, water gas shift, and acid gas removal) (Wen et al., 2016). Accordingly, choosing methanol as the coproduction chemical requires the least process adjustment and investment (Liu et al., 2019).
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Pyrolysis is the first step of coal conversion processes such as gasification, liquefaction, and combustion.
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Based on the five links of the whole process of coal production and utilization, including coal production, raw coal processing, logistics and transportation, conversion and utilization and ...
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The cogasification behavior and synergistic effect of petroleum coke, biomass, and their blends were studied by thermogravimetric analysis under CO2 atmosphere at different heating rates. The isoconversional method was used to calculate the activation energy. The results showed that the gasification process occurred in two stages: pyrolysis and char gasification. A synergistic effect was ...
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Introduction. Underground coal gasification (UCG) is the process of converting hydrocarbon materials into synthesis gas insitu. Underground coal gasification is sometimes referred to as insitu coal gasification (ISCG). The process has been developed over more than a century, though only a few projects currently operate on a continuous basis.
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The methane generation by coal biodegradation has been widely demonstrated in the laboratory. However, powder coal was mostly employed, and little is known about the methane production from coal in cube. A 2L fermenter was used here to perform the anaerobic degradation of lignite in cube by a fungimethanogens mixed microflora.
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In Poland hard coal and lignite still constitute the main source of electricity production (Jureczka et al. 2019); for example, in 2020, as much as % of electricity was generated from coal (PSE 2020; Żuk et al. 2021).In the light of the Green Deal approved by the European Commission on December 11th, 2019 (European Commission 2019), it is necessary to remove coal from the energy market ...
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Here, the synergistic effects of physicochemical properties and reaction temperature on the gasification of coalwaste activated carbonslurry coke for H 2 production were investigated. The results showed that the coke samples pyrolyzed at 600 °C and 700 °C exhibited larger crystallite sizes and lower gasification reactivity, while those ...
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Carbon capture and storage (CCS) represents a key solution to control the global warming reducing carbon dioxide emissions from coalfired power plants. This study reports a comparative performance assessment of different power generation technologies, including ultrasupercritical (USC) pulverized coal combustion plant with postcombustion CO2 capture, integrated gasification combined cycle ...
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Coal and gas outburst is a frequent dynamic disaster during underground coal mining activities. After about 150 years of exploration, the mechanisms of outbursts remain unclear to date. Studies on outburst mechanisms worldwide focused on the physicochemical and mechanical properties of outburstprone coal, laboratoryscale outburst experiments and numerical modeling, minesite investigations ...
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Figure 8: Process of Coal Particle Suspension. 3. Fluidized Bed . Combustion. Advantages: ... • Waste products are captured and recycled in scrubbers and can be used to produce secondary .
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The main process treats carbon dioxide like any other pollutant, and as flue gases are passed through an amine solution the CO2 is absorbed. It can later be released by heating the solution. ... The displacement effect means that coal seam CO 2 injection could be most effective as part of the commercial production of coal seam methane (also ...
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Resource Demands of Coal Production. In Environmental Impacts of Coal Mining Utilization, 1987. A Waterconscious Future. Having estimated the quantity and location of future coal production and processing, and the methods by which this coal will be extracted, transported and processed, Alcamo (1984) computed the industry's water requirements. He assumed a "waterconscious" future in ...
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Coal is the primary energy source in China, and its life cycle inventory (LCI) is widely used as background data for life cycle assessment studies. Previous research indicates that the inventory of coal production varies regionally. However, the development of complete regionalized LCIs for coal production is quite limited. Here, we establish the first provinciallevel LCIs of local coal ...
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The mechanism of plasma pyrolysis of coal (Fig. 1) includes the evaporation of the moisture, devolatilization of the volatile components and char reaction [23].The primary pyrolysis products can be classified as light gas, tar and char in the coal chemical percolation devolatilization (CPD) model [24], [25], [26].The primary volatiles will undergo secondary reactions, producing secondary ...
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