Analysis And Optimization Of Steam Pressure Reducing And De-super-heater System In Combined Heater And Power Plant

Along with the national economy rapid development,the dependence on electric power industry is getting higher and higher.At the same time,the sustainable development put forward higher requirements for energy industry model.Combined heat and power(CHP)is an advanced technology to produce steam and power synchronously which produce power and steam safely and efficiently,and increase the utilization rate of energy.The main function of CHP is to provide steam for industrial process.Different technological processes have diverse requirements for the target steam.Steam parameters will respond the specific requirement,therefore,for relevant industries,the accuracy of steam pressure and temperature is essential.Simply consideration for equipment cannot guarantee the efficiency and reliability of the complete combined heat and power(CHP)system.The paper mainly focus on analysis and optimization of steam pressure reducing and de-super-heater system(PRDS)in combined heat and power(CHP).Firstly,the paper discuss the requirements for target steam and steam source based on typical industrial process,and summarize briefly the technical difficulties and the harsh requirements for equipment in CHP application.Then analyze the common root cause of cavitation,flashing and noise during PRDS,and put forward targeted solution from system design,material characteristic,industrial standard etc.The theme of the third chapter is steam target temperature control,analyze the influence factors from the microscopic point of view based on the known physical principle,extract the key parameters,quantify the important indicators,establish a simple and reliable analytical model,the complex process is divided into 4 steps: primary atomization,secondary atomization,water droplets penetration in the steam line and evaporation process.Primary atomization is mainly to discuss how to select the appropriate equipment combined with the application conditions and the technical characteristics of the main products;The secondary atomization mainly discuss the primary factors which affect the atomized droplets and accelerate further fragmentation process from micro level,such as water drop tension,steam internal energy condition,penetration analysis.Evaporation process is the last stage of steam cooling,high temperature steam and low temperature water drop experience heat exchange,the main research is to improve the heat exchange rate of steam and water,to further reduce the size of water droplets after breaking,increase the temperature difference between steam and water,and shorten the residence time and so on;The simulation process is to analyze and verify the validity of the model;Combined with the operation experience of the power plant and the actual case of equipment maintenance report,analyze the damage caused by the failure of steam temperature fail to reduce.Finally,from numerous report of power plant equipment operation,maintenance and overhaul of the service report,then sum up some successful experience and effective solutions after practice verification from the actual operation of the power plant.Analyze the operation law from the system design,control methods,installation requirements,operation and maintenance,and so,then put forward a practical and quantitative recommendations,ensure the quality of downstream process steam and improve the service life of the field operation equipment,Reduce maintenance costs.Finally,the combined heat and power(CHP)comprehensive economic benefits is better,and the operation stability is higher.