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Four kind of modes of solar concentrator replacing the source of auxiliary steam system were proposed by integrating the characteristics of coal-fired units' auxiliary steam system. Theoretical analysis for the mode of solar concentrator replacing the forth steam extraction was conducted, showing the feasibility of the mode.
The paper is drawn from a 2-year study of black liquor concentration conditions by ultrafiltration ceramic membrane technology, and obtaining excellent fuel for coal burning boiler of electric power plant. The experiment implies that solids in black liquor can be concentrated up to 4-6 times then before under conditions of adding flocculants concentration is 4.0-4.5mg/L and filtration pressure is...
To meet the condition for reutilization of derived energy and melting ash, the plasma gasification process was adopted to use high temperature of plasma furnace to gasify wastes (e.g., paper reject, paper sludge and hydro-cleaner residues). Processing paper pulp to residue derived fuel (RDF) can enhance physical stability and improve gasification efficiency. Paper pulp derived RDF has 12% ash, 15~20%...
Effects of total solids inventory on the axial voidage profile and the performance of an L-valve have been investigated in a circulating fluidized bed test rig (CFB; 0.15 m i.d. × 5.4 m high). It was found that the characteristics of pressure level across the CFB loop and the axial voidage distribution were a function of the total solids inventory. The results also showed that the total solids inventory...
The design is bio-fuel raw material drying equipment which is cross-flow belt dryer based on high-temperature hot water as the medium. According to the drying experiments, obtained the drying curve of materials at different temperatures. Through the experimental data, the general parameters of dryer were determined. The features of this design is that heat from the high-temperature hot which comes...
Through the research of the pulverized coal ignition and steadily combustion mechanism and the numerical Simulation of the 300MW tangentially pulverized coal fired boiler by coalfire software, combining the operating data of the boiler, we establish the corresponding relation between the result of numerical simulation and combustion stability. The result indicates that the higher volatile, lower content...
Due to the current qualitative method of the unburned carbon in fly ash for tangentially pulverized coal-fired boiler, the factor analysis was applied creatively to estimate quantitatively every influence on the unburned carbon in fly ash, considering the actual operations of 300MWe boiler. This study established the factor model to analysis the influences of unburned carbon in fly ash, and listed...
CCHP (Combined Cooling, Heating & Power) system is a highly efficient and flexible way to utilize natural gas, which attracts more and more attention. Two systems are presented for a vacation village in north of china, both of which generate electricity with gas turbine and utilize natural gas as fuel. One of systems adopts Brayton cycle, and the other adopts recuperative cycle. The analysis focuses...
For ultra supercritical boilers, steam separator is one of the most important parts in boiler pressure components, and its safety and reliability has the crucial influence on supercritical boilers during startup, shutdown and load following. This article takes steam separator for example to analyze the fatigue life of boiler pressure components and puts forward a short-cut calculation method. Based...
In this study, detailed models such as boiler furnace and convective heat exchanger, with the consideration of the requirements of boiler thermodynamic calculation, were developed based on Aspen Plus user model. A boiler system for the thermodynamic calculation of a 600 MW sub-critical boiler was established and results were compared to the reference data. The comparison indicates that the models...
This paper takes the energy savings as assessment criterion for Combined Heat Cooling and Power System, analyzes the conditions CCHP needs to meet in comparison with dispersed generation. Generating efficiency of cogeneration and the effects thermoelectric ratio has on energy-saving performance are analyzed as top priority.
With a view to the slag problem on the water-cooled wall and super-heater at furnace exit of a 670t/h power-plant boiler burning pulverized coal, which burners were arranged in the form of six corners tangentially firing, Phase Doppler Anemometer (PDA) was applied to investigate the gas-solid two-phase velocity field near the burner region for the first time. Two experimental cases were investigated,...
To resolve the problem of reclaiming residual heat of the flue gas for thermal organic media furnace with coal as fuel, a technique project of reclaiming residual heat of the flue gas using heat pipe technology is put forward, and the technology of heat exchanger network is optimized. 1.25MPa steam produced by the heat pipe steam generator reclaiming residual heat of the flue gas can supply supplement...
In this paper, the performance analysis mode has been established for gas and steam combined cycle with coke oven gas according to actual industry. The exergy analysis and calculation are carried on for the specific working condition. The exergy destruction of the whole system mainly concentrates on the combustion chamber and the waste heat boiler. Especially the combustion chamber occupied more than...
Experimental study was carried on a 300MW swirling combustion pulverized coal firing furnace with put parts of tertiary air as over fire air to reduce NOx emission. The influence of boiler operational condition on the characteristics of NOx emission were studied, such as the content of O2 at economizer exit, the proportion of the top tertiary air and mass flow of over fired air (OFA). Results show...
In order to give some suggestions for energy conservation rebuilding, comparison analysis was carried out on the coal-fired industry boiler and steam kettle system. Three schemes of steam water reclaim from the steam kettle to the coal fired industrial boiler were put forward. The first scheme adopted a heat exchanger to reclaim the heat released from the condensate water and hot up the feed water...
Oxygen-enriched CFB combustion technology has the combined advantage of producing high CO2 concentration flue gas which is suitable for direct compression and sequestration and allowing excellent fuel flexibility. Due to the nature of oxygen-enriched combustion, the combustion characteristic of fuel in CFB boilers would be significantly different from those in the conventional CFB systems. To accurately...
This thesis studies furnace air dynamic of 1000MW ultra-supercritical lignite-fired boiler to provide reference to develop firing system of 1000MW ultra supercritical lignite-fired boiler with independent intellectual property rights. Constant-temperature hot wire anemometer is used to study furnace air dynamic field. The results indicate that in the single-furnace double tangent air distribution...
Optimum condition of gasification process is the key to biomass utilization and synthetic gas co-firing with coal in boiler. Based on an equilibrium RGibbs reactor model, the performances of biomass gasification, such as exergy efficiency and low heating value of synthetic gas, were evaluated under the conditions of biomass moisture content changing from 10% to 40% in weight and mass flow ratio of...
In this paper a type of ultra supercritical boiler was researched for BMCR operating condition numerical simulation with the CFD software Fluent. When this type of boiler burning design coal in the BMCR operating condition, the combustibles content of fly ash is low, the combustion efficiency is high and the emission of NOx is low. The maximum heat load of the wall is located between the burner and...
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