The use of partitions condenser and water ring vacuum pump with heat pump, condenser pipe snake, water ring vacuum pump condenser preheater material doubles as a full use of steam at the end of the second heat efficiency and reduce the consumption of cooling water. This structure forms of multi-effect falling film evaporator at the end of the second steam condensation effect for the same temperature of water (only have a phase transition), and then discharged from the condenser. Condensed water has a high temperature, but it is soft water, you can make good use of. Water ring vacuum pump to the evaporator of the non-condensable gas and a small amount of vapor pumped back into the atmosphere. And maintain the effect evaporation has a certain vacuum. With the use of hydraulic jet as compared to the cooling water consumption, electricity consumption is low. Bright Dairy Group, in two models of the rich RNJM02-2400 type double-effect falling film evaporator as an example, the evaporation capacity of 2400kg / h, matching the water ring vacuum pump motor power 5.5kw, cooling water consumption 9t / h, water temperature l0 ℃, water temperature 38 ℃, and the capacity of the hydraulic ejector with double-effect falling film evaporator as compared to lower power 13.5kw, an hour to save 13 tons of cooling water. Water prices by 1.00 / t, drainage price 0.80 yuan / tons, electricity and water, one can reduce the operating costs 143,391 yuan, 3 years to recover all the investment in equipment.