Vacuum system having condenser and root vacuum pump set

A vacuum system having an independent inlet condenser set and a root vacuum pump set, comprising:

• an independent inlet condenser set (10) having an inlet end (11) for receiving vapor inputted from an output of an air cooling power generator condenser (100) of a generator (1);
• the output vapor which is mixture of non-condensable air and water steam;
• the water steam capable to be condensed, and the surplus air being outputted;
• a root vacuum pump set (30) including a plurality of root vacuum pumps (40);
• the root vacuum pump set (30) further including an input end (31) and an output end (32);
• the input end (31) being connected to the independent inlet condenser set (10);
• air outputted from the independent inlet condenser set (10) being inputted to the plurality of vacuum pumps (40) for compression and then the compressed air being outputted from the output end (32) and
• a backing pump (50) connected to the output end (32) of the root vacuum pump set (30) by using an output pipe (33);
• the backing pump (50) serving to receive air outputted from the root vacuum pump set (30).