120 m³/min Turbine Fan Used as Vacuum Pump in Paper Making Industry

Introduction

As the key components of turbomachinery, the impeller quality directly influence the aerodynamic quality and mechanical efficiency. Machining methods, precision and quality all have large effects on the capability parameters. GooDSeaA adopts complex components processed under five-axis NC machine tools which has a significant improvement on the efficiency and a low technological complexity. GooDSeaA studies geometry characteristic and processing technology of the impeller, analyzes machining technological difficulties and technical requirements of the impeller. Different from the conventional rough and finish machining process of the impeller, the machining of the impeller are classified into four working procedure, which are the slot rough machining aimed to cut a large number of blank material, the leaf blade semi-machining aimed to cut out the uniform allowance,the leaf blade finishing and passage finishing.

No matter multi-stage closed fan or single-stage open fan is used as vacuum pump, it has the characteristics of large suction and stable vacuum level. However, when the vacuum is high and the amount of air available for suction is less and less, air reflux and surge often occur. At this time, the heated air after being accelerated flows back to the suction port, and the intake pipe will be heated, which will seriously damage the stability of the vacuum degree. Therefore, the inlet of each turbine is equipped with anti surge valve. When the vacuum degree is high and the suction capacity is insufficient, the anti surge valve will automatically open according to the effective power of the turbine, and increase the air flow to prevent the occurrence of surge, so as to make the equipment power consumption and the required vacuum degree stable.

The suction capacity of the turbine is large. Generally, multiple points with similar vacuum requirements can be used together. When it is used as a vacuum equipment, it has the characteristics of centralized equipment, high efficiency and low energy consumption.Taking a 400 Thousand tons paper machine as an example, only three turbines are needed, the total installed power is 6550kw, and its vacuum capacity is equivalent to the requirement of 15 sets of water ring vacuum pumps with installed power of 8810kw, but the installed capacity is reduced by 2260kw. Under the same circumstances, it can save about 25% energy than the ordinary water ring vacuum pumps; after the air is rapidly heated and compressed by the turbine, the temperature of the discharged air is as high as 120-180 ℃, and the remaining heat is usually used for heating the white water and air system of the paper machine through the heat exchanger.The turbine does not need water as the medium when it works, and the annual consumption of water for the water ring vacuum pump is about 300000 tons per year. A single-stage turbine is designed with 24 deflectors on the shell outside the impeller, which can adjust the flow rate of air through the turbine, so as to adjust the vacuum degree.

Parameters of High-Speed VF Centrifugal Vacuum Pump

Unique advantage of GoodSeaA Centrifugal Vacuum Pump System

GoodSeaA centrifugal vacuum pump adopts variable frequency technology, which can adjust the speed of vacuum pump, adjust the power with the change of parameters of paper production line, and keep vacuum pump always working in the best operating condition.

GoodSeaA vacuum system is a completely customized design. The most reasonable vacuum point design is selected according to the user's paper machine operation. The vacuum degree proximity point, suction point is combined to make the high-speed centrifugal vacuum pump efficient and always run at high-efficiency zone of the pump’s and the motor’s characteristic line, it is equivalent to the aircraft flying at the most fuel-efficient cruising speed.

GoodSeaA centrifugal vacuum pump has three centrifugal pumps: single-stage, two-stage and three-stage. One equipment has multiple suction ports and can pump two different vacuum degrees. Therefore, a high-speed centrifugal vacuum pump can replace multiple water ring vacuum pumps, it has compact structure and many adjustable output parameters.

GoodSeaA vacuum system provides complete equipment and system solutions: including water-air separator, cooler, filtrate pump, silencer, valves, meters, fittings and fully automated control systems for online monitoring of vacuum degree and pumping flow.

Finite Element Analysis & Grids FEA Stress Displacement Result

Testing

Final Impeller Shape Compressor Commissioning