|
Dallman
The Dallman Power Station was built just to the southwest
of the Lakeside
Power Station
in 1968 to answer the increasing electric demand of a
growing city. It contains three coal-fired generating units.
The Dallman 4 Power Station, which was built to the west of
the original Dallman Station, was completed in 2009.
The first Dallman generator placed on line was Dallman 1, with a maximum capacity of 77 MW. It was followed by
Dallman 2, an 83 MW unit in 1972. In 1978, the completion of
Dallman 3, with a maximum capacity of 188 MW, more than doubled the power station's
total generating capacity. Dallman 4 has a maximum
capacity of 200 MW and provides the most cost-efficient
energy of all of CWLP's generating units. (Read
more about Dallman 4.) These four coal-fired units are
intended to meet customer base load.
In 2010, the four Dallman generators used 1,397,170 tons
of coal and 359,189 gallons of oil, all of which cost $56,845,955 to generate
2,551,510 MWH of
electricity. The net fuel cost of these generators was $22.28 per MWH.
Environmental Controls
All four Dallman units are designed to burn coal with an
approximate heat content of 10,500 Btu per pound.
Particulate emissions from all four units are controlled by
electrostatic precipitators. In addition, Dallman 4 utilizes
a fabric filter bag house to aid in particulate emission
control.
In addition, the four units are equipped with
flue gas desulfurization
systems (scrubbers) to control sulfur dioxide (SO2)
emissions. The use of scrubbing technology, which uses
limestone to trap SO2 in the flue gas before it can be
emitted into the atmosphere, allows CWLP to meet and exceed
federal Clean Air Act requirements while continuing to use
high-sulfur Illinois coal. The byproduct from this process,
synthetic gypsum, can be used as a soil amendment and in
cement making. The scrubber for Dallman 3 was installed in
1980 and underwent a $30 million upgrade that was completed
in the spring of 2012. As part of this upgrade, more modern
system controls and efficient equipment were installed to allow the unit to continue to comply with
Clean Air Act regulations. A second scrubber, serving Dallman 1 and 2, was
put into operation in June 2001 in response to requirements
of the 1990 Clean Air Act Amendments. Dallman 4's
scrubber was built when the plant was constructed.
Each unit is also equipped with
selective catalytic reduction (SCR)
systems, which operate year-round to reduce nitrogen oxides (NOX)
emissions to levels allowed by both state and federal clean
air requirements. The SCRs for the first three Dallman
units, which cost a total of $76
million to install, were placed on line in May 2003.
In addition to the environmental control equipment
described above, Dallman 4, one of the cleanest coal-fired
generating units in the nation, is equipped with
a powdered activated
carbon injection system for mercury removal; and a
state-of-the-art cooling tower that eliminates the need to send
high-temperature condenser cooling water back into Lake Springfield. The
other three Dallman Power Station units use once-through condenser
cooling water systems with water being obtained from Lake
Springfield and discharged back into the lake.
Power Plants
|
