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Discussion on seawater desalination technology and its application
LI Chang-hai,ZHANG Ya-xiaoSeawater desalination is the technical process of producing freshwater.Seawater desalination has been important approach to resolve the crisis of resource on the global freshwater.The techniques of seawater desalination are described,the theory,craft and use instances of multi-stage flash,multi-effect evaporation and reverse osmosis are introduced and compared.
Study on the removal of NOx from flue gas
At present the SO2 emission of the flue gas in thermal power plants have been controlled gradually and the high efficiency FGD equipments have been installed in new building power plants basically.It is the main task in the next step to control NOx emission in thermal power plants.The removal principle,the advantages and disadvantages,the present situation and the application of the flue gas NOx control technologies,such as SCR,SNCR,electron beam or corona discharge denitrification,photo catalytic oxidation are introduced in detail.Through analysis,comparison and synthesis of the removal efficiency,application condition and economic benefits of the above thchnologies,the keystone for the future denitrification research work is put forward.Based on the actual condition in our country the feasible scheme is proposed.It can be referenced in the improvement of the denitrification technology.
Analysis of ash and slag's comprehensive utilization of coal-fired power plant
Recently,government promulgation a series of push circulation economy of policy,for pushing comprehensive utilization of the resources,developing circulation economy,raise the efficiency of the using resource. Big and medium-sized coal-fired power plant produce lots of ash and slag and increases year by year. If these solids discard is thrown,not only wasting the resource but also pollution the environment. So it is very important for the big and medium-sized coal-fired power plant to develop comprehensive exploitation of ash and slag. First of all,the present domestic and foreign condition of ash and slag comprehensive utilization and the way of ash and slag comprehensive utilization is introduced. Finally,ash and slag comprehensive utilization is analyzed,combining a North China's coal-fired power plant.
Summary of deactivation mechanism for SCR denitration catalyst
ZHANG Ye,MIAO Ming fengDeactivation and regeneration of SCR catalysts have caught wide attention.Based on a comprehensive literature review,deactivation mechanisms of traditional SCR catalysts by catalyst sintering,arsenic,calcium,alkali and so on were discussed.Based on the research on various deactivation mechanisms,the optimal design of SCR denitration system and measures of preventing catalyst deactivation can be performed according to the boiler characteristics,fuel characteristics,and fly ash components.It is of great significance for expanding catalyst lifetime and reducing the operation and maintenance cost of the system.
Design and application of residential district domestic wastewater treatment plant
Process characteristics of domestic wastewater treatment in residential district are analyzed.Traditional aeration equipment and medium are compared.Bio-contact oxidation process is applied to treat domestic wastewater in residential district. The operating experiences have shown that the process is reliable and easy to operate.All pollutant indexes have reached integrated wastewater discharge standard.
The ecosystem restoration of polluted lakes
The present condition and the cause of pollution of our country's lakes are analyzed.The concrete measures of ecosystem restoration are elaborated in details from two aspects of the outside source and the inside source.Combining the project,corresponding applied effects are introduced,finally its merit and shortcoming are pointed out in concise.
Present status and perspectives of low-temperature SCR of flue gas denitrification technology
The high investment and operating-cost, not easy to retrofit in old power plant properly were the main disadvantages of the generally used SCR method. Low-temperature SCR technology could overcome those problems partly, but the catalysts easy to be poisoned by SO2 and H_2O in present. The research and utility of the low temperature SCR catalysts were summarized and further development of SCR technology was proposed in the end.
The present development of flue gas denitrification technologies in domestic coal-fired power plants
The present NOx emission situation,NOx controlling laws and policies,the status of flue gas denitrification technologies and its application in domestic coal-fired power plants were introduced.Some suggestions on the development of flue gas denitration in our country were put forward.