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Application of UASB and biological oxidation technology on wool scouring wastewater treatment
ZHU Huan,CHEN Ying-min,KOU Li-qingBased on the characteristics of the wool scouring wastewater,the practical engineering application of UASB and biological contacting oxidation process in treatment of wastewater was introduced.The operation practice showed that anaerobic and aerobic technological process ensured stable operation of the wastewater treatment device and the out water BOD5、SS、COD completely met the standard of class I in Sewage Comprehensive Discharge Standard.The investment and the operation cost were low.
The economy analysis of WFGD system without GGH and its environment impact
In the wet flue gas desulfurization system, whether or not a GGH is included has a big influence on the investment and operation cost. It also has effect on the ground concentration of NOx. Combining desulfurization program of 2×600 MW units, the technology, economy and its environmental impact are analyzed.
Research on the radioactive pollution of fly-ash in thermal power plants
The application and the present situation of radioactive pollution of fly-ash had been introduced.The radioactivity of fly-ash was potential harmful for the human health.The enrichment principle and pollution way of fly-ash in the coal,measure methods and detection standard of natural radionuclide contents were analyzed.Some suggestions of reducing radioactive pollution of fly-ash had been put forward.
Mercury transformation in coal of the power plant
WU Hao,QIU Jianrong,WANG Quanhai,et.al.The mercury content and its present form in the coal are discussedIts transformation in coal burning and its transportation in the atmosphere are also analyzed.
Experimental study on aluminium and silicon extraction from coal-ash at common temperature
A technological process and relative parameters to extract aluminium and silicon from coal-ash at common temperature are outlined.This basically solves the problem that leaching-out efficiency is low with similar methods.
The material and type selection of wet FGD pump
The slurry characteristics of wet FGD are described.The material and type seletion of wear resisting and corrosion-resisting pump is discussed.
Selection principle and calculation method of reagent consumption in coal-fired power plant
Face to the control process of nitrogen oxide for wet coal- fired gas,the selection principle was discussed by this paper,and different reducing agents schemes were compared comprehensively. According to the SCR,SNCR and SCR /SNCR,three different process technologies were reviewed. In order to provide the reference for engineers,the method to calculate the amount of reducing agent was summarized in detail.
Reliability evaluation methods of a power distribution metwork
Reliability evaluation methods of a power distribution network have been introduced overally including some main popular analytical and simulation methodsTheir advantages,disadvantages and application situation are also comparedThe development trend of reliability evaluation has been predicted
Numerical simulation and model experimental research on optimizing the flow field in wet flue gas desulfurization
YANG Ding;YE Xinglian;GUO Jun;Flow field is a key factor affecting the removal efficiency of SO2 from wet flue gas desulfurization absorption tower. In order to meet the requirements of ultra-low emission standards,the flow field optimization of wet desulfurization absorber is of great importance. The CFD method is applied to simulate the flow field of a wet desulfurization absorber for a 2 × 660 MW unit in a coal-fired power plant. The existing problems of the flow field in the absorber before optimizing are analyzed,and then the flow field is optimized. In the optimization scheme,flow guiding vanes are set in the inlet and outlet flue ducts,and a porous flow distributor is set in the tower. The flow field has been significantly improved after optimizing,which is conducive to improve the desulfurization efficiency,reduce slurry deposition and decrease flow resistance. Based on the similarity theory of fluid mechanics,a model of reduced proportion absorption tower is built to carry out flow field experiment. The velocity distribution uniformity of the experiment is similar to that of numerical simulation. The feasibility of the flow field optimization scheme is verified,and it can provide guidance for the design of absorption tower.
A review of chiefly control technolagies for mercury in coal-fired power plants
WEI Guo-qiang,HE Bo-shu,WANG Li-li,et alThe state of the current mercury control technologies used for the flue gas demercuration in coal-fired power plants have been given,including some typical methods that are widely studied around the world.Conclusions from the analysis indicates that further fundamental researches are needed for all the demercuration methods to be attractive in the future mercury control devices.Mercury removal technology by the Activated Carbon(AC),especially the advancing low-cost AC process might be the main method of the coming flue gas demercuration in coal-fired power plants.