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Song Z.,Kunming University of Science and Technology | Wu X.,Yunnan TianAn Chemical Co. | Zhang Q.,Kunming University of Science and Technology | Ning P.,Kunming University of Science and Technology | And 4 more authors.
RSC Advances | Year: 2016

The present work elucidated the effects of structures and surface species on the activity of CeO2 and SO4 2- doped MCM-41 catalysts toward NO reduction by NH3. The results indicated that the sulfated species were generated over Cat-A (Ce(NO3)3·6H2O and H2SO4 simultaneously doped on MCM-41) and Cat-B (Ce(NO3)3·6H2O first immersed to MCM-41 and followed by impregnation of H2SO4) except for Cat-C (H2SO4 first doped onto MCM-41 and followed by Ce(NO3)3·6H2O). The sulfate ion contributed to the formation of Ce3+ concentration, oxygen vacancies, and surface acidity, resulting in improvement of SCR activity. However, the positive influence on SCR activity was overwhelmed by the decomposition of sulfated species. The apparent activation energy of Cat-A (60 kJ mol-1) was much lower compared with that of Cat-B and Cat-C (71 and 78 kJ mol-1, respectively). Pore structures and surface species were responsible for the SCR activity over the CeO2 and SO4 2- doped MCM-41 catalysts. The best catalytic activity was obtained over Cat-A, followed by Cat-B, and Cat-C exhibited the least catalytic activity. © 2016 The Royal Society of Chemistry.


Duan P.,Yunnan Tianan Chemical Co. | Wang Y.,Yunnan Tianan Chemical Co.
Petrochemical Equipment | Year: 2012

The structure and working principle were introduced for belt conveyor in coal chemical industry. Its common fault was analyzed. The countermeasures were put forward for the conveyor safe, reliable and long period operation.


Chen L.,Yunnan Tianan Chemical Co. | Zeng X.-M.,Yunnan Tianan Chemical Co.
Petrochemical Equipment | Year: 2012

The introduction was made for hot blast stove structure characteristics, working principle and usage of hot blast stove, and the using process of the center gun nozzle and the flame stabilization device frequent causes damage was analyzed. The modification was made for liquid nitrogen wash gas nozzle, flame stabilization device size and center of the gun installation dimension transformation measures, flame stabilizer damage effectively, and the coal grinding system stable operation period was prolonged.


Yu X.-F.,Yunnan Tianan Chemical Co.
Petrochemical Equipment | Year: 2012

A detailed analysis was made for the equipment in use, in which filter cake abnormal failure phenomenon suddenly appeared, and the whole equipment itself vacuum the performance was inseparable. Based on the analysis, the counter measures were proposed and the maintenance was carried out aiming at the abnormal.


Xu H.-R.,Yunnan Tianan Chemical Co. | Duan P.,Yunnan Tianan Chemical Co.
Petrochemical Equipment | Year: 2012

It aims at the issue that the bearings of the condensate pump were frequently burnt out. The analysis is made by calculating its axial force and the strength of shaft that comes to the result that the main cause to the damage of the pump lies at the actual dynamic load being greater than that of design of the bearings during the operation of the pump. For this, countermeasures are put forward accordingly.


Tao Y.-Y.,Yunnan Tianan Chemical Co.
Petrochemical Equipment | Year: 2012

According to the operation status of coal gasification unit provided by Shell Company, the adjusting course of stress on quench air compressor K1301 inlet pipe. The cause analysis of pipe vibration was made and the effect of layout on compressor stability.


Huang J.-W.,Yunnan Tianan Chemical Co.
Petrochemical Equipment | Year: 2012

A special analysis was made for the damage of the filter bags and the deformation of the framework that caused a dropping of them into the blow eggs, which render the emission of the stack gas exceeds the standard value even reduces the blow eggs to failure to carry the dust a-way. For this, related countermeasures were put forward accordingly. It concludes that the carrying force for the blow-egg system shall equal to or greater than the required one of would-be removed amount of dust and not to operate the dust catcher at high dust level for long time as much as possible so that the deformation of the framework would not happen and less damage to the filter bags.

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