Advanced Materials Research Vols. 356-360

Abstract: The main objective of this project was to study the corrosion rate of three different structured packing materials, a metallic, one polymeric and the other one ceramic, which will be in contact with an aqueous solution of MEA (monoethanolamine) to 30% and sour gases in a countercurrent absorption column. The materials were studied in two electrochemical cells: the first one in the presence of an aqueous solution of 1N sulfuric acid, and the second in the aqueous solution of MEA 30%, the study was done using the Tafel extrapolation methods and resistance to the polarization to measure the corrosion current (I Corr), and determine the corrosion rates of the three materials structured packings. The standard procedure used was according to ASTM G59-91, following the technique ININ No. P. SC (Cl) -06, the following results were found: in the presence of 1N sulfuric acid solution the metallic material presented a rate of 7.8 x 10-4 corrosion mpy (miles per year), the polymeric material submitted a corrosion rate of 2.82 x 10-4 mpy, and the ceramic material presented a corrosion rate of 1.03 x 101 mpy. With the aqueous solution of MEA at 30% in weight, and the sour gases the results were as follows: the metallic material presented a corrosion rate of 6.42 x 10-2 mpy, the polymeric material submitted a corrosion rate of 1.48 x 10-1 mpy and the ceramic material presented a corrosion rate of 5.6 x 10-1 mpy. These results provide a basis for predicting the lifetime of the three materials, as well as chemical resistance in the absorption column. Finally, we examined the morphology of the etched surface by scanning electron microscopy and found that in the metallic material was formed a layer of Cr2O3, which is helping the passivating material to further protect the acid attacks, the polymer material has a surface smoother after the attack and in the ceramic is observed pores larger than those observed in the material before the attack.

Abstract: China has rich lignite resource, which has high moisture, low calorific value, short ignition period, etc. These characters limit lignite large-scale processing, utilization and transport also become difficult.Therefore, under our country's coal-dominated energy structure, lignite quality improvement technology can enhance the development and application for optimizing the energy structure. This paper will also introduce the development status of lignite quality improvement technology at home and abroad, and then give some insights for the future using of lignite.

Abstract: Drawdown cone volume of pumping well reflects the hydro geological conditions of aquifer, such as hydraulic parameters and elastic storage for confined aquifer. During later period of pumping test in non-leaky confined aquifer, the relationship between drawdown and distance appears as straight line in plots figure, and the relationship between drawdown and time appears as straight line in plots figure. Based on Theis solution, through analyzing of the slope of curves , and integrating, volume of drawdown cone of pumping well in non-leaky confined aquifer was derived in this paper.

Abstract: Based on the investigation of water resources carrying capacity connotation, the parameter of water resources carrying capacity calculation model provided by predecessors is modified. The modified model is applied to analyze the water resources carrying capacity of Liaohe River basin in base year and planning years under different water quantity guarantee ratios. The results show that among the water resources subzones of Liaohe River basin, the water resources carrying capacity in Up Liuhekou and Down Liuhekou is amendatory, while it is worse in Hunhe and Taizihe-Daliaohe Main River. In wet year, all the subzones can carry while in other years the carrying capacity is different.

Abstract: The electric and hydraulic control system of hydraulic support is the critical part for the mechanized working face to work productively and efficiently. Its energy transfer and conversion were realized by the hydraulic fluid containing high content of water as transmission medium. Nowadays we mainly use the simply treated mine water in the hydraulic fluid, and the treated mine water still contains various ions of suspension. Those impurities can damage some sensitive parts of the control system and result in the paralysis of the whole system in the worst case. Therefore, the quality control of the mine water used in the electric and hydraulic control system is very crucial. This paper is to examine the mine water quality index in conjunction with case study, discuss the negative effects of mine water on the electric and hydraulic control system, and propose scientific solutions.

Abstract: This paper conformed the indoor air quality evaluation of buildings in Lingui, using the designed evaluation system combined subjective assessment with objective evaluation. By calculating and analyzing the experiment data and survey data, the comfort and the main effecting factors of public buildings in Lingui was put forward herein. Eventually appropriate measures were proposed to improve the indoor air quality.

Abstract: The synthesis of a new triazene reagent 1-(4-antipyrine)-3-( 3-nitroaniline)-triazene (ANTA) and its color reaction with Cu (Ⅱ) was studied and a new spectrophotometric method for the determination of Cu (Ⅱ) was established. The results showed that in the presence of micromulsion Tween-80, ASTA could reacted with Cu ( Ⅱ) to form a red stable complex of which the molar ratio of reagent︰metal was 2︰1 in Na2B4O7-NaOH medium.. The maximum absorption peak of the complex was located at 522 nm with the apparent molar absorption of 1.5 ×105 L•mol^-1•cm^-1. Beers law was obeyed in the range of 0.3～5.5 μg/10 mL for Cu (Ⅱ) and the detection limit was 0.10 mg/L. Many ions did not interfere the colour reaction system due to the existence of ammonia. This method was applied to determination of Cu (Ⅱ) in water samples, and the results were in accordance with those obtained by AAS method. Recovery was in the range of 103.1～103.4 % and the RSD(n=6) was not more than 4.2%.

Abstract: The paper presents a novel method for the flotation separation of Cd²⁺ with ternary association complex system prior to the determination by spectrophotometry. The effects of different parameters,such as the dosages of KI and octadecyl trimethyl ammonium chloride (OTMAC),various salts and acidity etc. on the flotation yield of Cd ²⁺ have been investigated to select the experimental conditions. The possible flotation mechanism of Cd²⁺ was discussed.The results showed that by controlling pH2.0,in the presence of 1.0g (NH4)2SO4, when the dosage of 0.1 mol•L^-1 KI solution was 2.00 mL and 0.01 mol•L^-1 OTMAC solution was 2.00 mL respectively, the water-insoluble ternary association complex of (OTMAC)2(CdI4) which produced by Cd ²⁺ and I-,OTMAC cation (OTMAC+) floated above water phase and liquid-solid phases were formed with clear interface,while Mn²⁺ , Ni²⁺ ,Co²⁺ , Zn²⁺ and Al ³⁺ could not be floated,so Cd²⁺ was floated quantitatively at pH2.0. Thereby, the quantitative separation of Cd²⁺ from the above metal ions could be achieved.A new method of determination of trace cadmium by flotation separation was established.The proposed method has been successfully applied to the determination of Cd ²⁺ in the sample of synthetic water and the flotation yield was 97.2%~108.7%.

Abstract: Numerical optimization research was made for the dielectric barrier discharge (DBD) reactor for NOx removal in order to improve the efficiency of the DBD reactor. In this paper, the optimization method proposed by our studying team was adopted to carry out the numerical optimization research on the discharge gap of the reactor. As a result, the breakdown strength of reactor was 44.8kV/cm at a 2mm discharge gap and the discharge started at 25μs. When the discharge gap increased to 8mm, the breakdown strength was 34.1kV/cm and the discharge time was 33μs. The removal rates under the two conditions varied little due to the similar electron mean energy, then experiment was conducted to validate the accuracy of the simulation. When the discharge gap increased, the gas handing capacity of the reactor got higher.Therefore, proper discharge gap has important influence on removal efficiency of NO during DBD.

Abstract: Recirculation is considered as an dual effective way of processing the leachate and accelerating the stabilization of landfill in many treatment because of less land occupation, low investment and simple operation. Previous researches shows that recirculation can improve microenviorment of microbial anaerobic digestion by increasing the moisture content of landfill. The mathematical model of moisture migration in the landfill was established with Multi-physics finite element analysis software in this paper. The simulation result showed that 1) moisture content would decrease to 29% with no leachate recirculation condition 2) hydraulic loads and types of recirculation both had influences on water distribution in landfill sites with leachate recirculation.