The first Dallman generator placed on line was Dallman 1, with a maximum nameplate capacity of 86 MW (most recently tested at 65 MW). It was followed by Dallman 2, with a nameplate rating of 87 MW (most recently tested at 62 MW), in 1972. In 1978, the completion of Dallman 3, which has a maximum nameplate capacity of 199 MW (most recently tested at 1871 MW), more than doubled the power station's total generating capacity. Dallman 4 has a maximum capacity of 200 MW (most recently tested at 208 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 2014, the four Dallman generators used 1,251,473 tons of coal, 567,244 gallons of oil, and 519,580 dekatherms of natural gas, all of which cost $60,622,126.00 to generate 2,344,681.13 MWH of electricity. The net fuel cost of these generators was $25.86 per MWH.
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 by-product 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 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.
|The Genesis of a Power Plant: Dallman 4—a pamphlet commemorating the history of the Dallman 4 project in words and pictures—is available free of charge while supplies last. Order yours or view it online.|
Dallman 4, a 200-MW (most recently tested at 208 MW) pulverized coal power plant, is one of the cleanest coal-fired generating units in the nation. Its completion ensures the city of Springfield a cost-efficient, reliable and environmentally responsible source of electric power for the next several decades.
Construction was begun on the plant in late 2006. Although still in the testing phase, the plant became operational on May 11, 2009, when—under power of natural gas—it produced 13 MW of electricity as the unit was synchronized to the grid. As testing continued, the plant began operating using coal on June 1 of that year. Systems-testing was completed on November 19, at which time the general contractor, KBV Springfield Power Partners, handed over operating control of the plant to CWLP. In addition to being completed months ahead of its contract completion date, Dallman 4 came in under its projected $454.6 million budget, a feat virtually unheard of in the power industry.
Employing a Foster Wheeler pulverized coal boiler, the nameplate-rated 200-MW unit (which tested in 2014 at 208 MW) replaced 76 MW of old coal-fired technology—the utility's two remaining Lakeside turbine generators. Lakeside Units #6 and #7, CWLP's oldest still-operating turbine generators at the time, were placed into service in 1961 and 1965, respectively. These plants have been been decommissioned.
Dallman 4 employs a number of environmental control technologies, including:
|1.||low-NOx burners for the boiler; a selective catalytic reduction (SCR) system for additional NOx removal;|
|2.||a fabric filter bag house to remove fine particulate;|
|3.||a wet flue gas desulfurization unit (scrubber) for the removal of SO2; and|
|4.||a wet electrostatic precipitator to remove acid mist and ultra-fine particulate from the
This equipment assists CWLP in its goal of becoming one of the most environmentally friendly primarily coal-fired electric utilities in the nation.
Air emission controls aren't the only way Dallman 4 complements the utility's efforts to protect and preserve the environment. By utilizing state-of-the-art cooling towers, CWLP is able to avoid discharging high-temperature cooling water from the plant into Lake Springfield.
KBV Springfield Power Partners served as general contractor for the construction project; Black & Veatch designed the plant, while Kiewit provided the construction; and Burns & McDonnell served as owner's engineer on behalf of CWLP.
Dallman 4 Fun Facts
|1.||The unit burned approximately 552,500 tons (1.4 billion pounds) of Illinois coal in 2014.|
|2.||The demand for coal supports about 80 mining jobs in Illinois.|
|3.||Approximately 40 permanent jobs were needed to support the long-term operation and maintenance of the facility.|
|4.||In constructing the facility:|
|- 644 pier foundations were drilled|
|- 21,500 cubic yards of concrete were poured|
|- 7,100 tons of steel were used|
|5.||The 8.8-million-pound Unit 4 boiler is hung from the top of the building.|
|6.||The facility has three coal silos, each of which hold 650 tons of coal.|
|7.||One of the unit's environmental controls, a pulse jet fabric filter baghouse, contains over 6,600 26-foot-long bags that collect fine particulate from the flue gas.|
|8.||At 440 feet in height, the Unit 4 chimney is the second tallest structure in Springfield. (The Unit 3 chimney is the tallest; the Units 1 and 2 chimney is third tallest; and the State Capitol is fourth.) Construction of the Unit 4 chimney required only 28 days, 3 hours.|
More information about Dallman 4 can be found in the Dallman Power Station collapsible panel above.
Together, in 2014, these peaking turbines used a total of 931,408 dekatherms of natural gas costing $496,413 and 210,142 gallons of fuel oil costing $555,016 to generate 9,258.1 MWH of electricity. The average net fuel cost to operate these units was $113.46 per MWH.
In 2014, these units used a total of 2,020 gallons of diesel oil costing $6,183.75 to generate 20.95 MWH of electricity. The unit’s net fuel cost was $295.17 per MWH.
Links to more information about CWLP power plants and related topics can be found in the left-hand column of this page.