Mild thermal upgrading before coal utilization was an efficient method for sulfur removal as well as the quality upgrading. Two coal samples with high sulfur content from Guizhou province were selected in this study t...
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Mild thermal upgrading before coal utilization was an efficient method for sulfur removal as well as the quality upgrading. Two coal samples with high sulfur content from Guizhou province were selected in this study to investigate the releasing mechanism of different forms of sulfur under different atmospheres during mild thermal upgrading. The study showed that sulfur in coal can be divided into three types: table organic sulfur, pyrlte sulfur and unstable organic sulfur. Small amount of oxygen in the carrier gas can significantly improve the release amount of SO 2 in coal especially for the pyrite sulfur. The breaking of C-C and C-S bonds during thermal upgrading were observed to have different selectivity for different oxygen contents. The study indicated that 4% O 2 -N 2 low oxidizing atmosphere and 400 °C was the optimal working condition for mild thermal upgrading before combustion.
The removal of reactive red 2 and methylene blue from aqueous solution was studied using soybean meal as an adsorbent. The effects of some parameters such as solution pH and contact time on the adsorption were investi...
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The removal of reactive red 2 and methylene blue from aqueous solution was studied using soybean meal as an adsorbent. The effects of some parameters such as solution pH and contact time on the adsorption were investigated. The equilibrium time was found to be more than 60 min for equilibration. Equilibrium data conformed to the Freundlich, Langmuir and Redlich-Peterson isotherm models, where the maximum adsorption capacity of methylene blue was 50.2 mg g-1 for the Langmuir isotherm at 25°C, but the maximum adsorption capacity of reactive red 2 was low (16.4 mg g-1). Soybean meal, which are easily available and inexpensive, could be employed as a promising adsorbent for the removal of methylene blue, but not for reactive red 2.
The experimental research was carried out about process of SO 2 removal in flue gas using white lime slurry atomization, and with the method of non-contact on-line measuring for SO 2 concentration in riser. The temp...
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The experimental research was carried out about process of SO 2 removal in flue gas using white lime slurry atomization, and with the method of non-contact on-line measuring for SO 2 concentration in riser. The temperature distribution of slurry atomization drying was measured by new sandwich structure thermocouple with air pump. The results showed: The maximum SO 2 removal and temperature decreasing amplitude were got at a distance 200mm from the nozzle. Atomization temperature region was bimodal symmetric distribution. Evaporation intensity from high to low along the axis. The SO 2 removal rate was first increased and then decreased, SO 2 removal and evaporation strength biggest regional overlap. Two-stage spray desulfurization efficiency increased 11.9%.
Field synergy between the molten steel flow field and the temperature distribution was analyzed at first in this paper. It shows when the synergy angle between the molten steel flow field and the temperature gradient ...
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Field synergy between the molten steel flow field and the temperature distribution was analyzed at first in this paper. It shows when the synergy angle between the molten steel flow field and the temperature gradient field is more than 90° in the tundish, the molten steel temperature distribution is more homogeneous and the synergy number is smaller. Then the flow fields and temperature distributions in the one-strand tundish established with different flow controls were numerically calculated. The results show that the synergy angles are more than 90° in the back-flow zones and gradually decrease as far from the back-flow zones till to almost 0°. The temperature gradient are large in the zones near the tundish wall boundary and around the stopper. When the tundish equipped with a turbulence inhibitor, a weir and a dam, the synergy angles are more than 90° in the majority of molten steel flow domains, the temperature distribution is even. So, the established controls in the tundish can modify the flow characteristics and temperature distribution.
This paper presented the research results on the feasibility of the engineering application of high-efficient using straw technologies in the north rural areas of China. The biochemical conversion, the thermo-chemical...
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This paper presented the research results on the feasibility of the engineering application of high-efficient using straw technologies in the north rural areas of China. The biochemical conversion, the thermo-chemical conversion and the straw briquette process are all high efficiently straw stem using technology. The long wintertime and the cold climate limit the effect of biochemical conversion. The straw pyrolysis oil production technology still needs further research to promote engineering application. The straw gasification is a better technology for the high efficiently using straw stem, but the tar problem is a tough barrier. The direct combustion technology is simple and practical, but the burning efficiency should be further improved. The straw briquette technology is nearly mature for engineering application. Further more, the straw briquette has a good transport and storage properties. It can be a fuel pretreatment technology.
In order to meet emission standards for nonroad diesel engines and improve the quality of gas mixture, a new swirl chamber combustion system was brought forward. The external supercharging system in diesel engine is i...
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In order to meet emission standards for nonroad diesel engines and improve the quality of gas mixture, a new swirl chamber combustion system was brought forward. The external supercharging system in diesel engine is investigated. Experimental research in a singer cylinder 135 diesel engine with four valves is accomplished using swirl combustion chamber under several different supercharging pressures. The results showed that fuel consumption and emissions are reduced under external supercharging, and there is minimum fuel consumption under supercharging pressure of 0.15MPa. Under supercharging pressure of 0.18MPa, NOx emission is lower 600×10 -6 than that of normal pressure at 8°CA BTDC of fuel supply advanced angle in swirl combustion chamber. The four-hole nozzle is used at 90 percent load, which diameter is 0.36mm, and nozzle hole cone angle is 140°.
To detect the residue of polycyclic aromatic hydrocarbons (PAHs) in the environment quickly by immune method, preparation of high quality antibody against PAHs is the most critical step of the project As the first ste...
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To detect the residue of polycyclic aromatic hydrocarbons (PAHs) in the environment quickly by immune method, preparation of high quality antibody against PAHs is the most critical step of the project As the first step toward developing sensitive enzyme linked immunosorbent assays (ELISAs) for selective detection of anthracene in environment, a new hapten was synthesized by the Friedel-Crafts acylation reaction from anthracene. It bears a carboxylic group with four carbon length spacer at the position 1 of anthracene. The hapten was characterized by 1 H NMR, IR, and element analysis. The hapten was coupled with bovine serum albumin (BSA) to raise an antibody or with ovalbumin (OVA) to form competitor conjugate. The artificial antigents were verified by their spectral characteristics using ultraviolet spectrophotometry. The resultant immunogen was fabricated and used to stimulate immune responses in rabbits to survey the characteristics of the hapten. The obtained antiserum exhibited relatively high antibody titer (1:110000) in indirect ELISA.
The Through the simulating rainfall experiment, a contrast study on slope runoff and sediment yield characteristics of loess and purple soil under the same experimental conditions was conducted. The result shows that ...
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The Through the simulating rainfall experiment, a contrast study on slope runoff and sediment yield characteristics of loess and purple soil under the same experimental conditions was conducted. The result shows that the loess slope develops the infiltration excess runoff and deeper erosion gullies, whereas the purple soil favors the saturation excess runoff with undeveloped or weakly developed slope channels. Furthermore, the slope erosion of the loess was much greater than that of the purple soil under the same conditions. When soil conservation measurements are made, appropriate methods should be taken according to the soil characteristics in order to achieve ideal effects..
According the low-temperature (Td) data of 60 years from 1950/1951 to 2009-2010 in Fujian Province, geographic information, olive planting area, cut rates of yield and the farmer's net income, the low-temperature ...
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According the low-temperature (Td) data of 60 years from 1950/1951 to 2009-2010 in Fujian Province, geographic information, olive planting area, cut rates of yield and the farmer's net income, the low-temperature frost risk division of olive plant is done based on GIS technology, expert grading method, mathematical statistics and so on. The mainly indexes include the four factors of hazard, exposure, vulnerability and disaster prevention and reduction capability those combined results of the natural disaster risk, and the olive comprehensive risk assessment index is made of them to forming a division map of olive low-temperature and frost. The mainly results as follows: The risk factors of distribution are an uneven distribution. It is high low-temperature and frost risk region in County of Minqing, Shanghang, and YouXi, and the risk index reached 0.7418, 0.5818, 0.51; the olive can develop in those areas that are FuZhou south coast, PuTian, QuanZhou and the most parts of ZhangZhou in Fujian Province.
In this work, a modeling study was carried out using the KIVA-3V code with the Zeldovich thermal NOx model, the improved soot formation model and the combustion model for a diesel/methanol dual fuel engine. The effect...
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In this work, a modeling study was carried out using the KIVA-3V code with the Zeldovich thermal NOx model, the improved soot formation model and the combustion model for a diesel/methanol dual fuel engine. The effects of ratios (10%,20% and 30%) of methanol substitution for diesel fuel on soot and NOx emission characteristics were investigated. Good agreements between predictions and measurements of engine out NOx and soot emissions were achieved. The present computations confirm that methanol allows soot reduction with a little NOx penalty except heavy and full load. With increasing methanol ratio, soot emission decrease markedly while NOx emissions have some increase. At 75% load, the engine-out soot emissions decrease by 66.4% while the engine out NOx emissions increase by 21.5% for 30% methanol, when compared to diesel fuel.
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