A New Vacuum Technology for Steam Turbine--Efficient Vacuum Evacuation System

Turbo-evacuation of steam turbines currently employs mainly jet ejectors, ejectors, and water ring vacuum pumps. However, in actual operation, the jet ejector system has high energy consumption, large water consumption, low pumping efficiency, and space occupation. Big questions.

In response to the above problems, Shandong Conviction Energy Saving Technology Environmental Protection Co., Ltd. combines domestic and foreign advanced experience technology to develop a new generation of high efficiency vacuum system power generation system. The system has low energy consumption (the old system reduces energy consumption by 80% or even higher), basically no external drainage, small footprint, continuous stability, high efficiency, and brings immeasurable benefits and wealth to users and society.

How efficient vacuum devices work

The system consists of a pre-processor, water filter, variable frequency air-cooled vacuum pump, special high-efficiency vacuum pump, heat exchanger, accumulator, frequency converter, pressure detection device, temperature detection, water level detection device, cooling water pipe, electrical operating system Such components, installed in the condenser near the location, suction pipe installed on the same side or side of the condenser. The non-condensing gas and part of the steam sucked from the condenser enters the pre-processor through the pipeline. After passing through the pre-processor, most of the water vapor condenses into water and is recycled to the condenser hot well. After the volume of the remaining gas becomes small, Into the accumulator and then into the oil ring vacuum pump; vacuum pump pump chamber with the appropriate amount of oil, the oil rotates with the impeller, thrown under the action of the centrifugal force to the surrounding, forming an approximate thickness of the closed oil ring, the inner surface of the lower part of the oil ring and The impeller hub is tangential, the upper inner surface of the oil ring is in contact with the tip of the blade, a crescent-shaped space is formed between the impeller hub and the oil ring, and the impeller is divided into several small cavities with the same number of blades. The volume of the small cavity rotates with the impeller. Smaller and bigger, the small chamber communicates with the suction port, the gas is sucked in, and when the suction is finished, the small chamber is isolated from the suction port; when the impeller continues to rotate, the small chamber changes from large to small, so that the gas is compressed, when small When the chamber communicates with the exhaust port, the gas exits the pump and enters the oil separator. After the oil separator is separated, most of it is discharged into the atmosphere. A small amount of water vapor in the gas is condensed into water by the working oil, because the density of oil and water is not When deposited on the bottom of the oil-water separator, the water level was raised to the position above 1/2 water separator, automatic drainage. Through the above-mentioned continuous and continuous work, the non-condensing gas in the condenser is ensured to be extracted, thereby ensuring the vacuum stability of the condenser. During the working process, the circulating cooling water in the oil cooler removes the heat generated by the continuous circulation of the working fluid and maintains the oil temperature.

Efficient vacuum pumping system features

The high-efficiency vacuum pumping system replaces the original jet (gas) pumping device and has the following advantages when the original operating process parameters do not change:

1, reduce power consumption

The old jet ejector motor power is generally 22 ~ 90kW, after use, the motor power can be reduced to 6 ~ 15kW. The steam ejector has a converted power of 45 to 90 kW, which reduces main steam consumption and increases power generation by 39 to 84 kW.

2, reduce water consumption

Old-fashioned jet aspirator requires large amounts of replenishment, and the amount of replenishment is generally not less than 15 t/h. These waters are basically wasted and discharged. High-efficiency vacuum devices require only a small amount of circulating water and are closed loop.

3, the system is simple, safe, reliable, less maintenance

In general, the water jet ejector is equipped with two jet pumps, one injection tank, one recycling puddle, and one recovery pump. The system covers a large area and the facilities are dispersed. The high-efficiency vacuum pump system device is a quick-installed structure integrated in the public On the base, the structure is simple, there are not many wearing parts, centralized control, and the floor space is small. The daily operation basically does not require maintenance.