The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Entropy generation analyses on the transient processes of heat exchangers can guide their designs and operations. A dynamic model of a typical recuperative heater is developed based on mass, energy, and momentum conservation equations. Dynamic behaviors of the heater during transient processes are analyzed based on the second law of thermodynamics. The real-time entropy generation rate due to the...
Supercritical CO2 recompression Brayton cycle has emerged as a promising power cycle for various types of power conversion systems. In order to seek further performance improvement of supercritical CO2 recompression Brayton cycle, thermodynamic effects of main compression intercooling (MCIC) are investigated in this work. Mathematical models were developed for Supercritical CO2 recompression Brayton...
The flexibility of coal-fired power plants must be improved to satisfy load fluctuations in power grids caused by the rapid spread of power generation capacity from unpredictable renewable energy sources. Startups, shutdowns and large amplitude load cycling have become normal operational states for coal-fired power plants in recent years. The extremely high thermal inertia of a power plant influences...
This paper deals with an exergetic analysis of the flue gas pre-dried lignite-fired power system (FPLPS) based on the boiler with open pulverizing system (OPSB) to explore the energy-saving potential of the FPLPS. A steady-state simulation was performed to obtain thermodynamic properties of process streams in a 600 MW unit. Results indicated that the plant efficiency of the FPLPS was relatively 3...
This paper describes a simulation investigation on the FPLPS (flue gas pre-dried lignite-fired power system) integrated with WHR (waste heat recovery). The plant thermal efficiency of a 600 MW power unit based on FPLPS is found to be improved by 1.70% compared with the CLPS (conventional lignite-fired power system) unit and the water saving is 81 t h−1. The WHR system is composed of air pre-heater...
Pre-drying of lignite before feeding to the boiler is a potential way to increase the net efficiency of lignite-fired power plants. Lignite pre-drying is, however, a high energy consumption process with a high risk of spontaneous ignition. If the lignite is dried at low temperature, the possibility of spontaneous ignition of lignite in the drying process could be lowed. Furthermore that low temperature...
Lignite is a kind of low rank coal with high moisture content and low net heating value, which is mainly used for electric power generation. However, the thermal efficiency of power plants firing lignite directly is very low. Pre-drying is a proactive option, dehydrating raw lignite to raise its heating value, to improve the power plant thermal efficiency. A pre-dried lignite-fired power system integrated...
This paper presents a system to upgrade faecal matter in an environmentally friendly way by the deployment of plasma gasification and SOFC (solid oxide fuel cells). The entire system chain, including a dryer, a microwave-assisted plasma gasifier, a gas processing system and an SOFC system, is studied to evaluate system performance and self-sustainability. The effects of gas processing approach, moisture...
Lignite is considered to be a competitive energy raw material with very high security of supply viewed from a global angle. However, the utilization of raw lignite faces many thorny issues, such as a low plant thermal efficiency, a high investment in construction of the lignite-fired power plant, etc. Lignite pre-drying seems to be an attractive way to tackle these issues. We have performed a thermodynamic...
The oxygen-enriched gasification of biomass micron fuel (BMF) was studied. Thermogravimetric analyses under different oxygen concentrations were performed to investigate the gasification behavior. The results showed that the increasing oxygen concentration enhanced the release of volatile matter and the combustion of fixed-carbon. The autothermal gasification of BMF using the oxygen-enriched air agent...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.