900kw Francis Hydro Turbine 50m Water Head Variable Pressure

Product Description

900kw francis hydro turbine water turbine and 60Hz micro hydro generator for mini hpp

Francis turbine also called mixed flow turbine and variable pressure turbine, is widely used in hydropower plants with low, middle and high water head ranging from 25m onwards to 550m commonly 15 to 300m. It has advantages such as: working stable, structure compact. Most import of all, the Francis water turbine we made would work with high efficiency of about 92% to 94.5%.

Francis turbines may be designed for a wide range of heads and flows. This, along with their high efficiency, has made them the most widely used turbine in the world. In contrast to the Pelton turbine, the Francis turbine operates at its best completely filled with water at all times. The turbine and the outlet channel may be placed lower than the lake or sea level outside, reducing the tendency for cavitation.

Hongya Power Generating Equipment To Utilities Limited, is founded in May, 2003 as a professional manufacturer of mini hydraulic generator generator set.The total company land is about 70000 Square meters, construction part 35000 Square meters. The employee is about 200 workers, which the R&D part is 25%.

We can manufacturer Francis turbine, pelton turbine, turgo turbine, Kaplan turbine, synchronous generator, speed governor, brushless excitor, hydraulic hardware etc with unit turbine generator set capacity under 20MW.

Till now, HPGE offer a comprehensive range of hydroelectric power plant solutions that cover the entire scope of service including: Small hydro power project consultant; Site management studies; equipment Design; Hydroelectric equipment Manufacture; Project management; Installation guidance; Commission and start operation; Operation guidance; Hydroelectric equipment maintenance.

Products of HPGE are widely used in all around China, we cooperate with more than 300 hydro power plants with more than 600 turbine generators sets , including Francis turbine generator set, turgo turbine generator set, pelton turbine generator set, Kaplan turbine generator set, areas covering more than 20 provinces of China and also international markets such as Russia, Belarus, Turkey, Albania,Vietnam Indonesia, Nepal, Laos, Sri Lanka, Cuba and Brazil etc.

Brief introduction of turbine structure and main component

1. Water inlet parts

Water inlet parts consist of Z941H-10C-700 motorized gate valve and φ700 expansion joint. Gate valve is used to close the unit in static water when need stop, it is also used to close the unit and cut the water flow in dynamic water when the unit is in emergency and turbine distributor break down. Expansion joint is used for installation error compensation and convenient for dismantle when maintenance. A drain valve is located at the bottom of expansion joint.

2. Spiral case

Spiral case is casting welding part, equipped with fixed guide vane in it. Spiral case shall make the water become number of swirl of water flow and guide water to flow regularly into guide vane apparatus and runner along circumference. It is equipped with an air relieve valve on the top of spiral case to exhaust air when filling water initially.

3. Turbine distributor

It consists of guide vane, guide vane lever, shaft sleeve, front cover, back cover, etc. It can form or change number of swirls of water flow to adjust turbine discharge according to variation of load. It is also used to normal and emergency shut down. The shape, dimensions, quantity and position of the 12 guide vanes is similar to the accepted model turbine, shall ensure the water flow won’t cause vibration during operating. Diameter of spacing circle of guide vane is 720 mm. The guide vane has the hydraulic torque performance of self-close trend within the range from full opening to near no-load opening. The maximum opening of guide vane shall have certain margin. Stop block is equipped for each guide vane, the guide vane can be controlled to swing with certain range and won’t hit with other guide vanes when the shear pin is broken. The guide vane is made of ZG06Cr13Ni4Mo, they shall be interchangeable. Each guide vane is machined precisely; the contacting line of adjacent guide vanes shall be finished to ensure perfect contact of all guide vanes under closing state in order to reduce water leakage. The bearings for guide vane shaft and distributor shaft are self-lubricated sliding bearings; the bearing shoe adopts steel back complex material. Use guide vane lever end cover and bolt to adjust and keep the position of each guide vane to the front cover and the rear cover. The sealing is located on upper guide vane shaft to cut the flow. The control ring is welded by steel plate as a whole. Circular guiding rail and wiring plate with lubricating performance are located on the bottom surface of the control ring. The control ring has enough strength and rigidity, won’t occur excessive bending due to unbalance stress of servomotor.

4. Runner

Runner is cast and welded as a whole, crown, band and blade is made of stainless steel ZG06Cr13Ni4Mo which has perfect performance of anti-cavitation, anti- corrosion and weldable. Shape of each runner blade shall be machined according to standard GB/T 10969 “Specifications for water passage components of hydraulic turbines”. The runner is welded and heat treated according to special specification, subject to non-destructive inspection according to relative standard. The runner is subject to static balance testing after machining. Ten Φ24 holes are located on runner crown in order to reduce the pressure applied on runner by the water.

5. Main shaft service sealing

Main shaft service sealing is packing set, located on main shaft pass through the front cover. The service sealing is close, anti-friction, simple, easy to observe, maintenance and replace. Stainless steel wearing ring is located where the main shaft contacting with the packing. The packing is made of reinforced PTFE, anti-friction, anti-corrosion.

6. Main shaft part

It consists of main shaft, fly wheel, etc. This type of hydraulic power generating unit adopts four fulcrums construction. Main shaft is made of 45# quality carbon construction steel. Disc type cast fly wheel transient stabilizes the unit when adjusting. Connect the main shaft and the runner by flat key to satisfy the interchangeable. Connect the turbine and generator by spring coupler for easy installation.

7. Draft tube assembly

Draft tube assembly consists of air admission connecting pipe, draft tube elbow and draft tube cone, guide the water flow into lower stream, make use of the potential energy of water flow at suction height, recycle major kinetic energy of the flow at runner outlet by its diffusion. All connecting flange shall be sealed, immersed depth of draft tube shall not be less than 30cm to prevent air entering draft tube. Air admission device: Natural air is filled to lower of runner through the top of draft tube to ensure steady operation of turbine when the guide vane under partial opening.

8. Bearing

Front bearing is radial thrust sliding bearing to bear radial and axial load. The thrust disc rotate, the oil pass through oil board then supply cooling and lubricating for the bearing shoe and thrust bearing shoe. Cooler is located at the bottom of bearing to reduce the temperature. Cooling water is from clean water tank, water pressure is 0.15 to 0.2MPa. Water filter is located in cooling piping. Two thermometers are located on front bearing for supervising the temperature of thrust shoe and bearing shoe.

Back bearing is radial bearing to bear radial load. Oil disc carry the oil for lubricating. One thermometer is located for supervising the temperature of bearing shoe. Cooling device is located at the bottom.

Use 46# turbine oil for bearing lubricating.

9. Servomotor assembly

It consists of servomotor, fork and control ring.

Governor adjusts the opening of guide vane through servomotor, fork and control ring according to the change of load.

10. Pressure gauge and vacuum gauge

Pressure gauge is located on spiral case for observing the pressure in spiral case. Vacuum gauge is located on draft tube elbow for observing the degree of vacuum. Valves shall be equipped on pressure gauge and vacuum gauge piping for close and open the piping.

11. Braking device

It adopts 2 hydraulic piston type brakes, service pressure is 0.5~0.7 MPa.

Adopt hydraulic principle for the brake. Provide oil through seamless steel pipe to the brake, push the brake to rub the fly wheel to stop the unit. In case there is oil leakage during operating, adopt appropriate method to solve it, such as tighten the loose nut by spanner or replace sealing material. The stroke of piston is 25mm. Adopt braking only when unit speed drops to below 30 % of rated speed!

12. Main shaft sealing drainage piping: Leakage water from main shaft sealing shall be drained through galvanometer pipe located on turbine, then drained to draft tube or collecting well through steel pipe prepared by user.

FAQ

Q1, Which turbine should I choose?

Please tell me the water head, flow rate, frequency, Total power you need

, voltage, on grid or off grid operation, we will propose a solution.

Q2, Can your factory provide all the equipment for hydropower generation?

Yes, we can provide you with turbines, hydro-generators, pressure regulators, turbine wheels, control panels, transformers, monitoring systems and more.

Q3, Can you do EPC for a hydroelectric power plant?

Yes, we can provide TURN-KEY and EPC services including measurement, design, manufacturing, construction, manufacturing, commissioning, inspection, maintenance runner replacement and refurbishment/upgrade/improvement/repair/refurbishment of turbines/generators including bearings, seals For parts and key parts, we will send technicians and workers to install equipment.

Q4,Is your company a trading company or a manufacturer?

We are a manufacturer of hydro turbine generators and started to promote the international market in 2013. Our factory is located in Sichuan, where China's water conservancy and hydropower is most developed. Welcome to visit our factory in China.

Q5, What is an acceptable MOQ?

For this product, our acceptable MOQ is 1 set.

Q6,How long is the delivery time?

Delivery times range from 15 days to 6 months depending on the model you are purchasing.

Q7,Does your company have its own independent official website?

Of course, and we can see more information about our company and products on our official website.