Under the background of auxiliary heat supply of ejector

in order to study the characteristics of ejector under variable working conditions

the calculation methods of ejector at home and abroad are investigated

the ejector calculation model is established and coupled with the high back pressure unit. Moreover

the effects of working steam

ejected steam

ejector back pressure

and ejector opening on the performance of the ejector under variable working conditions are obtained. The results show that

when the working fluid pressure of the ejector changes from 0.25 MPa to 0.45 MPa

the mass flow of the working fluid first increases and then decreases

and the ejector has the best performance at the design working steam pressure. The critical back pressure increases with the steam injection pressure. The pressure of the mixed fluid after injection will not only affect the work of the ejector but also the work of the condenser. Compared with the back pumping unit

the minimum cooling flow of the low pressure cylinder of the high back pressure coupling injector unit can be reduced by 140 t/h and the power supply range can be increased by 43 MW.