Vacuum Package For Electric Power Generation
EVP condenser packages are used in power plants to efficiently remove inner air leakage from the condenser. The effect is to provide lower vacuum or pressure, improve heat rates, and reduce generating costs.
The packages usually consist of a liquid ring vacuum pump (either a two-stage vacuum pump or a single stage vacuum pump with air ejector), air-liquid discharge separator, heat exchanger, and associated controls.
EVP condenser packages perform reliably, operate automatically, and hold the condenser at the best possible vacuum during unexpected transients of air leakage.
Power plants sometimes use the plant’s secondary cooling water for cooling the condenser system. This means that the cooling water temperature of the condenser system is higher than the cooling water temperature of the main condenser cooling water, which limits the pump performance. As a solution,add an air ejector as a first stage to the vacuum pump. Single-stage vacuum pump systems with air ejectors can reach very low pressures, irrespective of the cooling water temperature.
Condenser Initial Evacuation – Hogging
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 to perform this job. In these cases, a separate vacuum device is used.
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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 EVP 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 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. Our pumps are chosen for this application because of their ability to tolerate fly ash carry over into the pump.
Geothermal Gas Removal
Similar in application to condenser discharge, 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.
Turbine Gland Exhausting，Vacuum Deaeration and Water Box Priming
Steam turbines employ a gland to seal the shaft against inward air leakage. These glands are sealed with steam. In order for them to function as designed, excess steam and condensate must continuously be removed.
Boiler makeup must be deaerated before 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.
EVP 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 EVP priming valves, are ideal for this application because they prevent ingesting of water slugs into the pumps.
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