Electric Power

Gardner Denver has been supplying efficient reliable vacuum systems to the electric power industry worldwide for more than 50 years. These vacuum systems can improve power station heat rates and provide economical solutions for environmental requirements.

Our broad range of air compressors can also cater for the diverse applications found in this industry .

Compressed Air Applications

Compressed air is used in all types of power generation plants. Compressed air is relied upon to keep processes running and high quality oil free air is the first choice in power generation as reliable sources of compressed air are critical in these plants. Downtime can cost thousands in lost product and penalties.

  • Control valves – Air operated valves and cylinders used in production areas
  • Raw material handling – Compressed air, considered safe and reliable is used for handling hazardous material such as reactor rods.
  • Conveying – Compressed air is mixed with products to enable easier material handling and conveying
  • Filtration cleaning – Compressed air is used for reverse air jet purging to keep filters clean extending the lifetime and reducing downtime.

Condenser Exhausting

Condenser exhausting involves the removal of air and other non-condensable gases from the steam space of power plant condensers. The purpose of removing these gases is to maintain the lowest possible turbine backpressure. The equipment used for this application is crucial to the efficient operation of fossil fuel and nuclear power plants.

Condenser Initial Evacuation (Hogging)

In order to start a thermal power plant, a condenser must be brought from atmospheric pressure to vacuum. In some systems, requirements preclude the use of the condenser exhauster to perform this job. In these cases, a separate vacuum device is used.

Flue Gas Desulfurization

When flue gas is scrubbed to remove sulfur compounds, an aqueous slurry results. It is advantageous to remove the water from the slurry and handle only the solid material. This is done using vacuum filters. The liquid ring pump's ability to handle carryover from these filters makes it the ideal choice for this application.

Fly Ash Conveying

This application consists of pneumatically conveying fly ash from the precipitator hoppers to a central dry collection point under vacuum. The main advantage of this type of conveying system is that since the ash is being conveyed under vacuum, any leakage is of air inward, and not ash outward. Liquid ring pumps are chosen for this application because of their ability to tolerate fly ash carryover into the pump.

Geothermal Gas Removal

Similar in application to condenser exhausting, geothermal gas removal involves the removal of air and other non-condensable gases from the steam space of the condensers. However, in geothermal power plants, the steam used to drive the turbine is extracted from the earth and contains large amounts of corrosive gases. The gases must be removed from the condenser in the most efficient manner possible.

Hydropower

High pressure oil free compressed air is used for pump turbine dewatering, pump to turbine blow down, governor and regulated control valve operation, surge suppression, water aeration.

Turbine Gland Exhausting

Steam turbines employ a gland to seal the shaft against inward air leakage. In order for them to function as designed, excess gas and condensate must continuously be removed.

Vacuum Deaeration

Boiler makeup must be deaerated prior to being introduced into the system. This is sometimes done in a vessel called a deaerator. A vacuum is pulled on the vessel and the makeup water is passed through it to remove all dissolved gases prior to introducing it to the system.

Water Box Priming

In this application, vacuum pumps are used to maintain a siphon in power plant cooling water systems. Maintaining a siphon allows cooling water circulating pumps to maintain design cooling water flows with minimum power consumption. Single stage liquid ring pump packages, often supplied with specially designed priming valves, are ideal for this application because they prevent ingesting of water slugs into the pumps.