China CAMC Engineering Co.

Beijing, China

China CAMC Engineering Co.

Beijing, China
SEARCH FILTERS
Time filter
Source Type

Sun B.,North China Electrical Power University | Bai T.,North China Electrical Power University | Guo Y.,North China Electrical Power University | Kang Z.,North China Electrical Power University | And 3 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

Combustion instability and high carbon content in slag are the major problems for a 300 MW unit. To obtain a reliable solution, the motion trajectory of pulverized coal and actual combustion conditions in furnace were investigated. Reforming the burners which fixed at the bottom and installing some refractory belts in the primary combustion zone were suggested in order to reduce the amount of pulverized coal particles which drop into the dry bottom hopper. The technology can increase burn-out rate of the pulverized coal particles and decrease the carbon content in slag. Numerical calculation results show that the amount of pulverized coal particles which make ascending motion was obviously increased after the bluff body replaced with separator. The temperature in primary combustion zone rises and the burn-out rate increases obviously after installing some refractory belts, it could reduce the amount of pulverized coal particles in the dry bottom hopper. Experimental results reveal that the carbon content in slag was reduced by 23.2%~28.6%. The pulverized coal fineness has great influence on the carbon content in slag. The homogeneity of pulverizing and pulverized coal feeding in the coal pulverizing system is the primary cause for stabilizing carbon content in slag after retrofitting. © 2012 China. Soc. for Elec. Eng.


Wang T.,North China Electrical Power University | Sun B.,North China Electrical Power University | Xiao H.,North China Electrical Power University | Du X.,North China Electrical Power University | And 3 more authors.
Huagong Xuebao/CIESC Journal | Year: 2012

The experiment for removal of NOx in flue gas by non-thermal plasma generated in dielectric barrier discharge(DBD)was conducted to study the influence of temperature and gas composition of gas containing-ethylene on the removal. The results show that rate of NO removal is accelerated by increase of temperature. Under lower energy density, addition of electronegative molecule CO2 into simulation gas leads to efficiency reduction of NO removal because of decrease of radical generated, but the effect will be weakened with increasing energy density. The water addition in simulation gas can result in formation of more free radicals such as OH and HO2 which can promote oxidation of NO. However, if SO2 is also added which can react with O radical, on one hand, the reaction rate of O and C2H4 in the initial stage can be reduced, which makes NO oxidation decrease. On the other hand, free radicals O3 and HO2 with strong oxidation ability can react with NO prior to SO2. So, addition of SO2 has no influence on NO removal. © All Rights Reserved.


Wang A.,China University of Mining and Technology | Cheng X.,China University of Mining and Technology | Meng G.,China University of Mining and Technology | Wo L.,Mining Products Safety Approval and Certification Center | Pang Z.,China CAMC Engineering Co.
Advances in Mechanical Engineering | Year: 2016

The central groove is a key component of armored face conveyor. Failure of welded joints in the central groove often occurs in engineering. In this article, the welding procedure parameters were analyzed to the improve strength and toughness of the dissimilar steel weld joint in the central groove. First, four types of super-high wear-resistant steel and two types of high-strength welding wire were chosen as the welding materials. Carbon equivalent method, cold crack sensitivity index method, and maximum hardness of heat-affected zone test were applied to analyze their welding properties. Second, to improve their weldability, the proper preheating temperature was determined using Y-groove cracking test and mechanical property tests. Finally, a semi-automatic CO2 welding method was adopted, and a second mechanical property test was conducted to determine the proper welding wire. Results show that the chosen steels have poor weldability and cold cracking sensitivity. Preheating must be used to prevent cold cracking. When the preheating temperature is higher than 80°C, the cold crack rate can be controlled to under 20%, which can satisfy application requirements. Welding wire YMGR76 is appropriate. Using YMGR76, the preheating temperature drops to 120°C, and the strength and toughness of the weld joint are improved to 813 MPa and 112 KV2/J, respectively. This study provides a welding procedure to improve the reliability of the central groove. © 2016 Author (s).


Liu L.,Harbin Engineering University | Luan X.-C.,Harbin Engineering University | Rao S.,China CAMC Engineering Co. | Jin G.-Y.,Harbin Engineering University | Yu T.,Harbin Engineering University
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2013

Robust-fuzzy controller based on T-S fuzzy model was designed for real-time controlling of nuclear reactor power and adapting to the load changing of power grid. Local controller was designed by means of state feedback technique, and the global controller was designed by parallel distributed compensation (PDC) method. The result of solving linear matrix inequalities (LMI) proves that this controller is stable. The simulation shows that the nuclear power can be well controlled in three typical conditions by this controller.


Wang T.,North China Electrical Power University | Sun B.,North China Electrical Power University | Xiao H.,North China Electrical Power University | Zeng J.,North China Electrical Power University | And 2 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2013

The dielectric barrier discharge(DBD)in the coaxial setup was physically modeled, mathematically simulated, and experimentally evaluated to remove NOx. The impacts of the gas-gap width and electrostatic field distribution on the removal rate of NOx were studied. The simulated results show that the gap width significantly affects the removal rate of NOx, as confirmed by the experiment. The possible mechanism responsible for the removal of more NOx by a narrower gap is that a decrease of the gap width strongly increases the effective field, E/N; when E/N increases from 100 to 200 Td, the ionization rate and mean energy of electron increase 116 and 2.2 times, respectively. Consequently, an increasing number of N2 molecule turns into activated N atom, and the reaction, N+NO=N2+O, considerably enhances the removal rate of NOx.


Rao S.,China CAMC Engineering Co. | Gao Z.-P.,Inner Mongolia Electrical Power Research Institute | Shen L.-H.,Nanjing Southeast University | Liu Y.-J.,Inner Mongolia Electrical Power Research Institute
Xiandai Huagong/Modern Chemical Industry | Year: 2011

Fossil fuel consumption is the major source of anthropogenic CO 2 emission. Some new CO 2 emission reduction and utilization technology are summarized and analyzed in the paper. Chemical looping combustion based on circulating oxygen carriers is especially introduced as a new-style CO 2 emission reduction technology. Chemical looping combustion involves the cascade utilization of chemical energy, which has high thermal energy conversion in comparison with traditional thermal cycles. Moreover, it has more superiority in CO 2 enrichment and synergistic effects of contamination control.


Wang T.,North China Electrical Power University | Sun B.-M.,North China Electrical Power University | Xiao H.-P.,North China Electrical Power University | Zeng J.-Y.,North China Electrical Power University | And 2 more authors.
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2012

To study the effects of dielectric material on the removal of NO by dielectric barrier discharge (DBD), both simulation and experimental tests were carried out by taking materials with different dielectric constants as the dielectric layer, during which the relationship of E/N with either the ionization rate or the electron mean energy was analyzed based on Boltzmann equation. Results show that with the rise of dielectric constant, the field intensity increases, and accordingly resulting in promoted E/N, raised electron mean energy and improved ionization rate, in which case, more active particles will be produced. Among all the 3 materials including corundum, quartz and ceramics, the material corundum has the strongest ability to transfer charges due to its highest dielectric constant, which makes the discharge current be raised, and therefore is good for NO removal.

Loading China CAMC Engineering Co. collaborators
Loading China CAMC Engineering Co. collaborators