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Gasification is making a strong comeback as a sustainable energy source in clean energy systems such as IGCC, as a renewable source utilizing millions of tons of waste dumped in the landfill, and as a solution to the ground water leaching and CO2 & CH4 emission that risking our ecological system. In this paper, thermodynamic equilibrium and numerical analyses of the gasification of coal and tire...
A chemical reactions occurred during combustion process in circulating fluidized bed-boiler has been modeled using integrated concept of autocatalytic set and graph theory whereby eight important species identified in the process are represented as nodes and catalytic relationships among them are represented by an edges in the graph. In this paper, dynamics of the graph is investigated using Perron-Frobenius...
The research of groundwater system has a great significance on analysis of groundwater's formation condition, revealing the evolution of groundwater, evaluation and planning of groundwater. The essay taking shendong coal mining area for example; dividing aquifer of research region into 2 subsystem and 6 water-content rock formation; dividing system of groundwater flow in research region into 3 types;...
The floor water inrush is a geology hazard in China. Tt is a complex nonequilibrium and nonlinear evolution process which is affected by many factors. Spatial Data mining (SDM) can reveal spatial patterns and features of water inrush. With the SDM technique, the water inrush dangerousness of 9# coal floor of zhangcun coal mine was evaluated. The result shows that the SDM technique is a feasible effective...
Shenhua coal is difficult to form slurry of high concentration, low viscosity for its strong hydrophilicity. Based on that, coal water slurry (CWS) additive, denoted as LS-A, was used to prepare Shenhua coal blending slurry with high concentration, and then the slurry ability, rheological characteristic and static stability of LS-A were investigated. The results show that, the performances of CWS...
In this paper, the effect of different water content of the flame coal on its direct liquefaction reactivity was studied. The results show that: water content in the flame coal can be used as hydrogen supplier and promote direct liquefaction reaction inducing higher total conversion rate, higher oil yield and lower pre-asphaltene / asphaltene yield when the water content of the flame coal is of 20...
Hierarchical clustering analysis is one basic multivariate statistical instrument which is used in classifying research in multifarious fields widely. The most three common clustering methods are Single Linkage Method, Group Average Method and Ward Method in hierarchical clustering analysis. As it is about to confirm the sources, approaches and conditions of water leakage in BaYi tunnel, this article...
A method using reduction roasting and magnetic separation to separate and recycle the iron resource from Bayan Obo tailings was proposed in this paper. The variation tendency of the grade and recycling rate of iron in the iron concentrate powder under different conditions of coal powder addition and temperature was studied, meanwhile, the kinetic characteristic of carbon thermal reduction reaction...
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...
This paper introduced a newly developed coal flotation collector EDO and its flotation characteristics for five different coals. EDO is an emulsion composed of 27% diesel oil, 70% water and 3% surfactants. The surfactant PGS is synthesized with oil which is environmental favorable and reproducible. Compared flotation experiments show that, at the same dosage, EDO give 2-7% recovery promotion than...
The catalytic gasification properties and reaction kinetics of rice husk (RH) were studied by thermogravimetric analysis (TGA). The homogeneous model (HM) and shrinking core model (SCM) were used to simulate the gasification behaviors. The results indicated that magnesia and ferric oxide had obvious effects on the pyrolysis and gasification properties. They could increase the pyrolysis rate and gasification...
The combustion characteristics of biomass coal oil water slurry (biomass-COWS), containing Fujian anthracite, water hyacinth, heavy oil and dispersant were studied by thermal analysis with TG-DTG method. The results showed that the ignition temperature of biomass-COWS was 20%-24% lower than that of coal, and 15%-24% lower than that of CWS. The ignition temperature and apparent activation energy of...
Based on summing up forecasting method and theory about water-inrush from floor of working face, combined with a lot of practical information analysis, the main five factors controlling water-inrush from floor are found out, which are water yield property of aquifer, water pressure, effective confining stratum thickness of mining floor, fault or broken zone and mining pressure. According to the typical...
A circulating fluidized bed heat-power-gas-tar polygeneration technology has been developed which is based on the property of coal pyrolysis. To study the effect of temperature and coal type on pyrolysis behavior, the pyrolysis process of four different types of coal was investigated by TG-FTIR. The results showed that, at the heating rate of 25°C/min, pyrolysis process could be divided into four...
Coal water mixture is a new kind of fluid fuel, and the production of coal water mixture with automatic control is needed for its unique property. This paper focuses on design automatic control to the production of coal water mixture, and present some design schemes. It includes how to design coal water mixture with automatic control system. In addition, it introduces main blocks of coal water mixture...
Based on GIS, especially on its spatial analysis function, a case study on the predicting and forecasting of the risk of coal floor water-inrush was practiced in the I-1 mining district in the 5# coal mine in Pingdingshan coal area in this article. The 5# mine of Pingdingshan coal area belongs to the typical Carboniferous-Permian coal mining area which were threaten seriously by the coal floor water-inrush,...
The complexity of the coal gas compositions and their reactions properties affect the sulfidation of H2S with calcium-based-based sorbents, which is not easy to measure quantificationally. Using the ASPEN PLUS software, the reaction degrees between coal gas compositions can be obtained easily. The results show that the thermal decomposition of H2S is affected by temperature greatly and the higher...
In order to reduce dust concentration and prevent gas accumulation in the underground of coal mine, coal seam water infusion and gas drainage are fundamental measures. Present hole sealing methods are just for one purpose, which makes both too many holes quantities and waste of sealing materials. A new hole packer of center-through rubber self-expandable hole packer by water pressure was developed...
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