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In this paper, two typical Chinese coals were selected to investigate the pulverized coal combustion characteristic and their pore structure evolution in oxy-fuel combustion and conventional air combustion environment with a drop tube furnace (DTF). Results show that the burn-off rate of pulverized coal in O2/CO2 mixtures is lower than that in O2/N2 environment with equivalent oxygen concentration...
China's gross amount of hydraulic resource ranks first in the world; however, at present, China's economic development faces energy bottleneck. Huge market demands, as well as the strategy of western development, provide hydropower with an opportunity and a broad development prospect. At the same time, some negative influence on environment and ecology also give hydropower development with unprecedented...
The flow field within a three-level conical ring concentrator of a centrally-fuel-rich swirl coal combustion burner has been studied both experimentally and numerically. Measured and calculated values of gas velocities downstream from the third conical ring are in good agreement. In the outlet region after the third-level ring, a peak and a valley in the mean axial velocity profiles are seen to move...
Construction of the indicator system is the important prerequisite for evaluation on regional sustainable energy development. This paper initially establishes an integrative regional energy sustainable development indicator system which combines issues such as energy, economics, sustainable energy development evaluation and environment. Then, the ability of energy sustainable development in typical...
The reaction of a Chinese bituminous coal PDS with Fe2O3 was investigated by such experimental means as thermogravimetric (TGA) coupled with Fourier transform infrared spectroscopy (FTIR) and TGA-difference thermal analysis (DTA) with focus on the effect of the heating rate. It was found that the reaction of PDS with Fe2O3 displayed three-staged reaction characteristics, and a higher heating rate...
With the proposed of smart grid, the user's role in power system is being re-recognized. In order to realize user's role, many countries are implementing smart metering and demand response (DR). The investment of this system is so huge and the benefits of all parties participating in DR are not clear, all parties are not active to participate in it. In this paper, the problems of nonDR are listed...
China's national economy will soon face "a low-carbon economy" historic opportunity for the new situation. So it is very important to synthetically use coal bed methane in "three soft" mine areas. According to research results and practical work experience, the author discusses the characteristics of argillization, compression fracture and sucking technique of soft coal with low...
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...
The teetered bed separator (TBS) is a gravity separator and operated based on the hindered-settling principle. However, there has been less great progress in the fundamental technique and separation mechanism since they were invented. The emphasis on this study lies in discussing the separation mechanism of the teetered bed separator and design principles of the distributor and the feeding well. The...
In order to further understand the self-heating of coal, a chemical reaction model was proposed based on the previous model including two parallel reaction sequences. There are three different reaction sequences in this model. In comparison with the two parallel reaction sequences, the third reaction sequence is the self-reaction of initial active groups in coal. The reaction products of seven different...
The coal mines of Henan province are surely abundant water mining areas in China. The problem of the waste groundwater is much serious too. Through synthetical analyses of the water chemical characteristics , water chemical environment and the water chemical origin of acid groundwater, this paper proposes the principle of chemical sulfer erasing technique which can process mine acid water and the...
With China's rapid economic development and the world's total primary Energy declining, Energy bottleneck effect on China's economy has become increasing evident. China's economic growth pattern is in the transitional period from extensiveness to intensiveness, the improvement of the energy structure also becomes more urgent. In this paper, the authors put forward some measures to adjust China's energy...
Pulverized coal with a mass average diameter of 69 μm and a real density of 1444 kg/m3 was transported at an experimental bench for powder pneumatic conveying at pressurized conditions (up to 0.84 MPaA). Flow patterns of the pipe flow were observed by ECT (Electrical Capacitance Tomography) technologies. Differential pressures in horizontal pipes were measured. The ECT images showed a comprehensive...
This paper the dynamic model of multi-input and single-output is established, which takes the coal feed and water feed as the inputs and the main steam temperature as the output. Adaptive Network-based Fuzzy Inference System (ANFIS) is used to establish the system model, and using the field data on the identification and checking of model. The results show that the output of identification is consistent...
Micronized coal reburning is one of the most effective de-NOX technologies for its high NOX reduction efficiency and low operating cost. By numerical simulation and experimental study, NOX reduction efficiency influenced by the temperature and stoichiometric ratio in rich zone, the velocity and the particle size of reburning fuel during the coal reburning process in a one dimension furnace has been...
The back-pressure of the direct air-cooled unit directly affects the system running economy. Based on the thermodynamic model of the air-cooled system, according to the basic method of seeking the optimal back-pressure in theory, this article has established the back-pressure optimization mathematical model of the air-cooled unit to obtain the optimal back-pressure under the actual operating conditions,...
The briqutting of coal is a widely applied method for coal utilization. Water resistance of briquettes plays an important role in the storage and transportation of briquette products. In order to improve the water resistance of binderless lignite briquettes, the briquettes were heat treated and the effect of heating temperature and holding time on the water resistance of briquettes were investigated...
Study on additives for wet limestone FGD was introduced in this paper. Transition metal ions and organic acid additives were worthy of being further studied.
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...
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