Condenser Air Extraction
In order to
increase the availability, operational performance and reliability of turbine
condenser vacuum plants, the dynamic relationship between the vacuum pumping
system, condenser performance and turbine back pressure is an important factor
in the design requirements and needs careful appraisal when considering overall
plant performance.
The air load
from the turbine condenser system is saturated with vapour: liquid ring pumps
are ideal for handling high vapour loads as much of the vapour will be
condensed at the pump suction (by the direct condensing action of the inlet
water spray or contact with the pump seal water). This condensing reduces the
total volume to be handled by the pump, which is a significant advantage when
compared to other pumping technologies.
- Standard packages for holding and
hogging
- Designed to meet HEI specifications
- Local service and site
commissioning support
Flue Gas Desulphurisation
Flue Gas
Desulphurisation systems are a common feature on modern coal-fired power
plants; a by-product of the process is gypsum which is produced at the outlet
of a scrubber. Liquid ring pumps are used to provide vacuum on the dewatering
of the gypsum on a vacuum filter, usually belt or rotary drum type. The liquid
ring pump, typically a large single-stage design, is selected based upon the
surface area of the vacuum filter. The table below shows the pump model for a
selection of nominal capacities.
Fly Ash Handling
Vacuum
conveying of fly ash recovered by the Electrostatic Precipitator, ash is
collected in hoppers at the base of the ESP and is then conveyed to a storage
facility or loading silo. Liquid ring vacuum pumps are tolerant to ash carry
over and the single stage pump construction ensures optimum power at pressures
required for effective conveying.
- Pump capacities up to 5000 m3/h
- Corrosion/erosion resistant
materials available
- Systemised to meet project
requirements
Once
through or partial recirculation seal water
Waterbox Priming
The ability
to handle wet gases without any detrimental effect makes liquid ring vacuum
pumps ideal for condenser waterbox priming applications. Waterbox priming
serves two functions: to create a siphon effect reducing the amount of power
required to start the main cooling water pumps; and to ensure maximum condenser
cooling efficiency by preventing accumulation of air in the upper parts of the
cooling tube bundle.
- 200 and 400 m3/h pump capacity
options
- Modular package design enables
customised scope of supply
Duplex
Simplex
Vacuum
receiver