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Yu D.,Beijing Institute of Civil Engineering and Architecture | Cao Y.,China Academy of Building Research | Zhu Y.,Beijing Gas Group Research Institute
2011 International Conference on Electric Technology and Civil Engineering, ICETCE 2011 - Proceedings | Year: 2011

The underground construction is different from the building above ground with some features such as closed, wet, warm in winter and cool in summer. This article analyzed these features and developed a special type of Air Handling Units (AHU) for the underground building. This low resistance AHU can bypass air with the Rotating air cooling coil structure and vary supply air volume during transitional season. A set of apparatus for testing AHU performance is constructed, Supply air volume, total pressure, fan power and energy-saving rate of a new type of AHU have been tested and compared. © 2011 IEEE. Source


Zheng X.,University of Science and Technology Beijing | Zheng X.,Beijing Gas Group Research Institute | Su Q.,University of Science and Technology Beijing | Mi W.,University of Science and Technology Beijing
Energy and Fuels | Year: 2015

On the basis of a chemical looping combustion (CLC) process with adding a step of CH4 steam reforming, the influences of the preparation method, inert support of SiO2 or Al2O3, Ni component, particle size, and gas hourly space velocity (GHSV) on the redox performance of a Cu-based oxygen carrier (OC) were investigated. Results showed that the OC prepared with impregnation was able to react completely with H2 in reduction or O2 in oxidation but had a relatively low oxygen content ratio (Ro) because of the limitation from saturation loading of an active component. In contrast, the OC prepared with mechanical mixing had a high Ro as well as high reactivity. The inert support was able to inhibit the sintering of the OC through dispersing the active component. Methanation and reverse CO-water shift reactions occurred in the reduction step, where metallic Cu played the role of a catalyst. The utilization ratios of the OC for both reduction and oxidation increased as the size of the active component particle decreased and mildly decreased with decreasing the size of the OC particle. However, as the size of the OC particle approached the size of the inert support particle, the performance of the OC dropped. © 2015 American Chemical Society. Source


Zheng X.,University of Science and Technology Beijing | Zheng X.,Beijing Gas Group Research Institute | Su Q.,University of Science and Technology Beijing | Mi W.,University of Science and Technology Beijing | Zhang P.,University of Science and Technology Beijing
International Journal of Hydrogen Energy | Year: 2014

The reduction characteristics of Cu-based oxygen carrier with H 2, CO and CH4 were investigated using a fixed bed reactor, TPR and TGA. Results showed that temperatures for the complete reduction of Cu-based oxygen carrier with H2 and CO are 300 °C and 225 °C, respectively, while the corresponding temperature with CH4 is 650 °C. The carbon deposition from CH4 occurred at over 550 °C. CO-chemisorption experiments were also conducted on the oxygen carrier, and it was indicated that Cu-based oxygen carrier sinter seriously at 700 °C. In order to lower the required reduction temperature of oxygen carriers, a new chemical looping combustion (CLC) process with CH4 steam reforming has been presented in this paper. The basic feasibility of the process was illustrated using CuO-SiO2. The new CLC process has the potential to replace the conventional gas-fired middle- and low-pressure steam and hot water boilers. © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. Source


Huang S.-J.,China University of Petroleum - East China | Cheng L.-S.,China University of Petroleum - East China | Zhang X.-J.,Beijing Gas Group Research Institute | Jia Z.,China National Offshore Oil Corporation | Wei G.-B.,Petrochina
Well Testing | Year: 2016

Shale gas reservoirs possess characteristics of the low porosity, extra low permeability, high adsorbed gas content and the complex fracture networks which are distinct from that in conventional gas reservoirs and that leads to a huge difference of the seepage mechanisms and the productivity dynamic analysis methods between the shale gas and the conventional reservoirs. As one of the dynamic analysis methods, numeral simulation can model the special properties and complicated gas percolation characteristic in shale gas reservoirs. With the reservoir numeral simulation method and the overall consideration of desorption, diffusion and seepage features, the dual-porosity fractured horizontal well model was established to simulate the effect of the adsorbed gas, natural fractures and hydraulic fractures with variety parameters on the producing range, mobilization shape and production performance. Through the analysis, it is concluded that the intricate fracture network system constituted by the artificial fractures and the primary natural fractures crucially affect the mobilization shape during the producing process of the shale gas wells. The analysis results showed that the artificial fracture distribution and parameters (half-length and conductivity) maintain great influence on development effectiveness of shale gas reservoir. © 2016, Well Testing. All right reserved. Source


Zheng X.-M.,University of Science and Technology Beijing | Zheng X.-M.,Beijing Gas Group Research Institute | Su Q.-Q.,University of Science and Technology Beijing | Mi W.-L.,University of Science and Technology Beijing | Shi Y.,University of Science and Technology Beijing
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2014

A metal oxide oxygen carrier of Cu-Ni/Al2O3 was prepared by a mechanical mixing method, and its cycle performance investigated in a fixed bed reactor based on a new chemical-looping combustion process. The results showed that the fresh Cu-Ni/Al2O3 exhibited an excellent performance. However, the oxidation rate of oxygen carrier decreased from 91.0% in the first cycle to 27.7% in the 120th cycle. In contrast, the reduction rate of oxygen carrier decreased mildly, and maintained 86.8% in the 120th cycle. According to the characterization of the degraded Cu-Ni/Al2O3, the main reason for the performance degradation of the oxygen carrier was speculated to be the powdering of Cu-Ni/Al2O3 particles and local aggregation of the powdered fine particles. Through re-granulating the degraded oxygen carrier, the performance of Cu-Ni/Al2O3 was recovered to a level close to the initial performance. ©, 2014, Science Press. All right reserved. Source

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