Advanced Materials Research Vols. 724-725

Abstract: The formation of fouling in stainless steel tube was simulated in the existence of both sulfate-reducing bacteria and iron bacteria under the experimental conditions of the water temperature 30±0.2^°C and velocity of 0.4m/s with the dynamic simulation apparatus of shell-and-tube circulating cooling water. The paper studied the relation between water quality parameters and formation of fouling, such as Fe²⁺ concentration, CODcr and the total number of bacteria. The experimental results showed that: the main reason of the fouling resistance increase was the presence of sulfate-reducing bacteria and iron bacteria. The interaction between iron bacteria and sulfate-reducing bacteria accelerated the formation of biofouling. The influence of each parameter codetermined the formation of microbial fouling.

Abstract: This study, conducted with the dynamic simulation equipment under constant conditions of water temperature 30°C and flow rate 0.4 m.s-1, is intended to simulate dynamically the fouling process on stainless steel tube heat exchanger of three types of fouling microorganisms, iron bacteria (IB), sulfate-reducing bacteria (SRB) and slime forming bacteria (HB), which are isolated from the slime in the bottom of circulating cooling tower. This experiment was tested through the on-line monitoring of fouling resistant and analysis of the characteristics of heat transfer ,the results indicate that induction period for the formation of biofouling in the stainless steel tube by slime-forming bacteria is 56 h, Iron bacteria is 25h, and sulfate-reducing bacteria is 22h. Among these bacteria, the greatest impact on the heat transfer is taken by the iron bacteria, and the sulfate-reducing bacteria are next.

Abstract: The coal mine gas hazards as important factors affecting the coal mine production safety and it is the modern ore mining industry must be rigorous treatment of serious harm. This paper expounds the harm of coal mine gas,and analyzes the cause of it,then puts forward some prevention measures for it.

Abstract: This paper aims to investigate real gases energy separation effect such as real natural gas, CH₄ and C₂H₄ in vortex tube. Energy separation phenomena of real natural gas (RNG) were investigated by means of three-dimensional Computational Fluid Dynamics (CFD) method. Flow fields of ideal natural gas (ING), or RNG in low and high pressure were simulated. The results main factors were found that affect the separation effect. At the same time, this paper has illustrated the effect and tendency of energy separation with real gas in the tube under the same cold mass fraction and pressure ratio. The results show low pressure ideal gas and real gas energy separation effect difference about 3-4°C, the real gas effect is not obvious; High pressure real natural gas (HPRNG) and ideal gas (HPING) effect difference is 13-14°C, the real gas effect is obvious; CH4 (LRCH₄) and C₂H₄ (HRC₂H₄) energy separation effect is obvious and effect of real gas is generated.

Abstract: Pyrite was heat treated on a thermo-gravimetric reactor (TGR) and a drop tube furnace (DTF) in CO₂/N₂ mixtures with different CO₂ concentrations. The effects of CO₂ on pyrite transformation were investigated. The reaction products were characterized by XRD and XRF. The results show that, the presence of CO₂ can promote pyrite desulfurization and oxidation at 900°C and 1500°C. Pyrite oxidation seems to increase with CO₂ concentration. TGR results show that hematite and magnetite are the final iron products at 900°C and higher CO₂ concentration. DTF reaction samples generated at 1500°C with the presence of CO₂ contain pyrrhotite and magnetite, indicating incompletion of pyrite desulfurization/oxidization due to a short residence time.

Abstract: This paper introduces the phenomenon of stack rainout in the wet flue gas desulphurization system for the thermal power plant units without GGH,analyzes the factors affecting rainout of wet stack and finds out the main causes resulting in stack rainout of wet flue gas desulphurization for Wangtan Power Plant without GGH,such as low temperature after the flue gas desulfurizationinsufficient diffusion capability of flue gas flowthe blockage of mist eliminatorpoor operation of electrostatic precipitatorinadequate combustion of boilerhigh speed of flue gas flow in the stackthe effect of climate. Also it is analyzed that the mist eliminator equipment and ensuring the efficient operation of electrostatic precipitator may relieve the phenomenon of stack rainout.

Abstract: As Beijing is trying to build a global city, its energy security has become very significant. In recent years, Beijing's energy consumption increases steadily. And the government has taken lots of measures to optimize its energy consumption structure, promote utilization of renewable energy and pay attention to energy conservation. By a series of efforts, Beijing has made some achievements in the field of energy.

Abstract: AMESim model is on the basis of particular model gas engine fuel supply system. Elaborated the model in detail and made static and dynamic simulation. The static and dynamic characteristics curves of this system is got. Several important ideal structural parameters of this system were obtained. The results can be used for a theoretical basis for rapid prototyping and system structure optimization.

Abstract: According to the characteristics of cable and decoration materials, the typical fire scenes were built using the method of FDS large eddy simulation (LES)). The smoke movement, temperature change, visibility and CO distribution of different fire scenes were studied. The fire spreading and risk when the fire occurs in electric vehicle charging and swapping station (EVCSS) were analyzed, which provides an important technological support for effectively preventing fire and guiding evacuation in EVCSS.

Abstract: In this paper, one on-board charger in the charging station will be used to test its charging process. We screen the data which has the typical characteristics of power parameters from test data, and compared with the national power quality standards. We can get the following conclusions: (1) The electric car battery is capacitive load, it may transfer the reactive power to grid in the process of charging;(2) The test data imply that frequency deviation, power factor and VTHD e.g. indexes are qualified;(3) On-board charger is mainly produced the odd harmonics in the process of charging, with the increase of harmonic frequency, harmonic contain lower rate;(4) In practice, harmonic mainly reflects on the current, voltage only has a small distortion.