Reducing the overspeed during load rejection would benefit the mechanical and hydraulic systems in a hydropower station. This paper presents some selected results of a pilot installation of a dynamic braking system. T...Reducing the overspeed during load rejection would benefit the mechanical and hydraulic systems in a hydropower station. This paper presents some selected results of a pilot installation of a dynamic braking system. The 4 MW dump load was installed and tested on a 10 MW Francis turbine unit. The results show that the overspeed reduction is obtained and compares well with simulation results. Further, a reduction in vibration levels is positive as well as the reduced time for stopping and possible resynchronization. It is argued that a similar system with continuous cooling could be used as an attractive alternative to spillway capacity.展开更多
The design of a feasible Combined Heat and Power plant for a small community is presented. Of the many alternatives solid-waste disposal methods available, incineration of solid waste is recommended due to its potenti...The design of a feasible Combined Heat and Power plant for a small community is presented. Of the many alternatives solid-waste disposal methods available, incineration of solid waste is recommended due to its potential energy recovery of the heat released during solid waste incineration and recovery of valuable by-products that can either be reused, re- cycled or marketed, among other advantages. Hence, an attempt is made to use the heat energy released during incin- eration of solid waste to produce steam in a boiler, which in turn powers a turbine for eventual generation of electricity. The two processes involved in the generation of electricity for in-plant use or for a small community via a steam turbine-generator combination and a gas compressor-gas turbine-generator are presented. The analysis of the amount of energy produced from the solid waste energy-conversion system using an incinerator-boiler-steam turbine-electric generator combination with a capacity of 4.5 tons/day is also presented. The net electric power for a small community was found to be 148.24 kW with an overall efficiency of about 21% having taken cognisance of the process power needs and unaccounted process heat losses. Moreover, exergy analysis of the proposed CHP plant was carried out whereby the respective energy and exergy efficiencies of 83.2% and 62.1% were obtained.展开更多
The Guddu Thermal Power Plant of WAPDA is a main fossil powerplant in Pakistan,among which unit 4 with 210 MW in capacity suppliedby China,went into operation in 1986.Two 110 MW boiler-turbine-generator units and one ...The Guddu Thermal Power Plant of WAPDA is a main fossil powerplant in Pakistan,among which unit 4 with 210 MW in capacity suppliedby China,went into operation in 1986.Two 110 MW boiler-turbine-generator units and one 9 MW gas turbine-generator unit of phase Ⅰ projectof the power plant,provided by Skoda Export Co.of Czechoslovakia,wereput into operation in 1974,while one 210 MW boiler-turbine-generatorunit of phase Ⅱ,provided by the Technical Export Corporation of theSoviet Union,was put into operation in 1980.For the phase Ⅲ,one 210 MW boiler-turbine-generator unit,Which展开更多
文摘Reducing the overspeed during load rejection would benefit the mechanical and hydraulic systems in a hydropower station. This paper presents some selected results of a pilot installation of a dynamic braking system. The 4 MW dump load was installed and tested on a 10 MW Francis turbine unit. The results show that the overspeed reduction is obtained and compares well with simulation results. Further, a reduction in vibration levels is positive as well as the reduced time for stopping and possible resynchronization. It is argued that a similar system with continuous cooling could be used as an attractive alternative to spillway capacity.
文摘The design of a feasible Combined Heat and Power plant for a small community is presented. Of the many alternatives solid-waste disposal methods available, incineration of solid waste is recommended due to its potential energy recovery of the heat released during solid waste incineration and recovery of valuable by-products that can either be reused, re- cycled or marketed, among other advantages. Hence, an attempt is made to use the heat energy released during incin- eration of solid waste to produce steam in a boiler, which in turn powers a turbine for eventual generation of electricity. The two processes involved in the generation of electricity for in-plant use or for a small community via a steam turbine-generator combination and a gas compressor-gas turbine-generator are presented. The analysis of the amount of energy produced from the solid waste energy-conversion system using an incinerator-boiler-steam turbine-electric generator combination with a capacity of 4.5 tons/day is also presented. The net electric power for a small community was found to be 148.24 kW with an overall efficiency of about 21% having taken cognisance of the process power needs and unaccounted process heat losses. Moreover, exergy analysis of the proposed CHP plant was carried out whereby the respective energy and exergy efficiencies of 83.2% and 62.1% were obtained.
文摘The Guddu Thermal Power Plant of WAPDA is a main fossil powerplant in Pakistan,among which unit 4 with 210 MW in capacity suppliedby China,went into operation in 1986.Two 110 MW boiler-turbine-generator units and one 9 MW gas turbine-generator unit of phase Ⅰ projectof the power plant,provided by Skoda Export Co.of Czechoslovakia,wereput into operation in 1974,while one 210 MW boiler-turbine-generatorunit of phase Ⅱ,provided by the Technical Export Corporation of theSoviet Union,was put into operation in 1980.For the phase Ⅲ,one 210 MW boiler-turbine-generator unit,Which
