Research Of Energy Saving And Consumption Reduction On Coal Fired Units Of JW Co.Ltd

According to the requirements about notice of<Coal-fired power energy saving and emission reduction promotion and improvement action plan(2014-2020)>issued by National Development and Reform Commission,for active 600 MW and above coal-fired units except air cooling units.the average coal consumption rate should be less than 300g/kwh before 2020.There are two 600 MW supercritical coal-fired units in JW company.The annual utilization hours is decreasing.Coal consumption rate is in the middle reaches of the same type units.The cost of power generation and power generation sort order is not dominant.Due to the tighten of national environmental policy and the reducing of on-grid electricity prices,the coal-fired power companies' profits will be significantly reduced.As the electric selling market has been opened,the electricity bidding market increases sharply,the survival and development of coal-fired power plants are facing a huge challenge.It becomes an important method to increase economic benefits for power plant reducing its cost.In order to reduce coal consumption rate,this paper focuses on the energy consumption of the two units in JW company.It is started from four aspects: to increase the boiler efficiency,to reduce the turbine heat consumption rate and to reduce the auxiliary power rate,to reduce the unit start-stop energy consumption.To find out the main influence factors of the unit energy consumption.The main cause of the boiler efficiency is the high temperature of the effluent air.The main cause of the turbine heat consumption rate is the Low efficiency of steam turbine cylinder and valve throttling loss.The main cause of the auxiliary power rate is the high power consumption of the primary air fans,condensate pumps and circulating water pumps.The main cause of the start-stop energy consumption is the time consuming of start-stop process.Through operation optimization and technical transformation for equipment,for example optimizing the oxygen content of boiler,optimizing operation curve of steam turbine valve,optimizing primary air pressure,condensate pump frequency conversion transformation,expansion unit reform of circulating water pump,optimize unit start-stop procedures.The coal consumption of JW company is expected to decrease by 8.0942 g/kWh,.The expenditure can be effectively saved by 374 thousand yuan once every start-stop process of the unit.We achieve energy-saving and cost-reducing that can really improve the market competitiveness of JW company.At the same time,this paper also provides reference of energy-saving and cost-reducing for the same type power plants.