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This study investigates a novel supercritical carbon dioxide Brayton cycle with a bleeding anabranch used in coal-fired power plants. For the proper utilization of the medium-low temperature heat in the boiler, the coupling between the air-preheater and the cycle is concentrated. After analyzing the distribution of heat duty in the boiler, the flow diagram of the Brayton cycle is design. Subsequently,...
This work proposed and analyzed an integrated solar hybrid system for upgrading and utilization of low-rank coals using coal pre-drying, low-temperature pyrolysis and power generation, efficiently converting the low-rank coal into exportable value-added coal while generating electric power locally. The collected solar energy could be utilized in a cascade way to feed coal pre-drying and low-temperature...
Methane (CH4) recovery from natural gas hydrates (NGHs) by CO2-CH4 replacement is considered as a win-win technology for producing CH4 and sequestrating CO2 synchronously. In this investigation, simulated Integrated Gasification Combined Cycle (IGCC) syngas of CO2/H2 gas mixture is used to replace CH4 from simulated methane hydrate which is formed in pure water at 274.15 K and 4.5 MPa. The changes...
Based on the SC (solute cavity) theory and the FMO (frontier molecular orbital analysis), a new method named as the SC-FMO method is established to investigate into the inherent characteristics of the hydrate formation and the effects of the hydrate promoters on the hydrate formation, and predict the hydrate structures. It is concluded from the experimental and theoretical computation results that...
Using CO2–CH4 (carbon dioxide–methane) replacement to produce CH4 from NGH (natural gas hydrate) is not only a new CH4 production technology but also a direct way to disposal CO2 by CO2 hydrates. Although there are many studies focusing on the mechanism of CH4 replacement in hydrates by CO2, the mechanism of the replacement is still not clear. In this work, the replacement process and hydrate structure...
Double reheat steam systems have been receiving more attention because of the rapid development of ultra-supercritical power plants. In this study, the thermodynamic analysis and design optimization of a double reheat system in an ultra-supercritical power plant are comprehensively conducted. Besides, thermodynamics calculation, as well as exergy and techno-economic analyses are conducted to reveal...
This study proposed a polygeneration system based on coal partial gasification, in which methanol and power were generated. This proposed system, comprising chemical and power islands, was designed and its characteristics are analyzed. The commercial software Aspen Plus was used to perform the system analysis. In the case study, the energy and exergy efficiency values of the proposed polygeneration...
The hydrate-based CO2 (carbon dioxide) separation and capture from CO2/H2 (hydrogen) gas mixtures with the different CO2 concentrations is investigated in 0.29 mol% TBAB (tetra-n-butyl ammonium bromide) solution. Raman spectroscopic analysis is employed to determine the compositions of the mixed hydrates containing CO2, H2, TBAB and H2O (water). The phase equilibrium conditions shift to extreme conditions...
Retrofitting existing power plants for CO 2 capture poses numerous constraints. The layout of the original process and the structure of the existing equipment cause various special problems in the design process as well as influence system performance. In view of these, this paper carries out process simulations, characteristic analysis, and system integration of CO 2 capture based...
The hydrate-based carbon dioxide (CO 2 ) capture from the integrated gasification combined cycle (IGCC) synthesis gas using the bubble method is investigated with a set of visual equipment in this work. The gas bubble is created with a bubble plate on the bottom of the equipment. By the visual equipment, the hydrate formation and the hydrate shape are visually captured. With the move of the...
In this paper, the phase transition characteristics of CO 2 and CO 2 /H 2 mixture are analyzed, and ideas for improving the cryogenic separation method are drawn. On this basis, a novel CO 2 cryogenic liquefaction and separation system is put forward. In the novel system, two-stage compression, two-stage refrigeration, two-stage separation, and sufficient recovery of...
Effects of 0.29mol% tetra-n-butyl ammonium bromide (TBAB) solution in conjunction with cyclopentane (CP) on the hydrate-based pre-combustion CO 2 capture are investigated by the measurements of the gas uptakes, CO 2 separation efficiencies and induction time of the hydrate formation at the different temperature–pressure conditions. The results show that the volume of the TBAB has an...
The distribution of energy and industry in China is extremely uneven. The western region is rich in energy resources but relatively economically backward, while the eastern region, particularly, the southeast coastal area, is an industrially-developed area but is short of energy resources. On the basis of such a situation, this paper recommends the sustainable development of energy systems for the...
To determine the appropriate operating conditions for separating carbon dioxide from flue gas via the hydrate formation, the effects of the concentrations of dodecyl trimethyl ammonium chloride (DTAC) in 0.29mol% Tetra-n-butyl ammonium bromide (TBAB) aqueous solution and the initial pressures on the induction time of the hydrate formation and CO 2 separation efficiency are investigated. The...
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