摘要
降低火力发电厂的厂用电率是提高火力发电机组效率的有效方法,目前常用的降低火力发电厂厂用电的技术方案是采用小型汽轮机驱动给水泵或者风机的方式,或者采用变频技术。为降低火力发电厂的厂用电率,提出一种全新的技术方案,即通过移植航空涡扇发动机技术,利用高温换热器替代核心机的燃烧室加热从压气机出来的高压空气,高温高压的空气在透平内膨胀做功以后再排到锅炉中,压气机由透平驱动,透平富余功率可以用来发电,或驱动电厂用电设备。通过建立该技术方案的性能计算模型,计算结果表明,对于600 MW火力发电机组,在透平入口空气温度为700℃时,在不增加锅炉排烟温度的条件下,空气透平除提供锅炉用风耗功以外,还可以发出最多超过9 MW的电功率,折算减少厂用电率达3%。对空气轮机降低厂用电与小汽轮机降低厂用电的方式进行比较,结果显示该技术方案优于小汽轮机降低厂用电方式。
Reducing power consumption rate is effective way to increase the system efficiency of thermal power generating units,in currently,people often using a small turbine to drive feed water pump or fan to reduce the power consumption rate or using converter technique.A new technology program is proposed in order to reduce the power consumption rate,by transplanting turbofan engine technology to power plant,through using the high temperature heat exchanger replaced the combustion chamber of gas turbine to heat high-pressure air flowed from the compressor,so the high temperature and pressure air flowing into turbine and then discharging to boiler after expensing and working in turbine.In addition to drive the compressor,turbine generating surplus power can be used to replace part of the auxiliary power or drive electrical equipments.The computational model of the performance of the technology program was established and the calculation results show that when the temperature of the air at the inlet of the turbine is 700 ℃,at the condition of the boiler without increasing the exhaust gas temperature,in addition to providing the boiler wind power consumption,air turbine system can also generating more than 9 MW of electrical power,conversion decreased plant electricity rate about 3% for the 600 MW thermal power unit.The effect of reducing power consumption rate through air system and small steam turbine are compared and the results show that the new technology program better than using a small turbine to reduce the auxiliary power mode.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2012年第18期137-143,共7页
Journal of Mechanical Engineering
关键词
涡扇发动机
空气轮机
厂用电率
火电机组
Turbofan engine Air turbine Power consumption rate Thermal power unit
