New U Of M Energy Plant Reuses Power To Bolster Efficiency
The brick facade is a century old, but the burning, spinning and capturing of heat contained in the College of Minnesota’s new Main Power Plant is the wave of the longer term.
The plant, situated on the banks of the Mississippi River near Dinkytown, came on-line last month and will save the college about $2 million a yr in utility prices.
This environment friendly facility is a combined heat and energy plant, meaning the heat that’s generated from making energy — up to 22 megawatts — is captured and used to make steam, which heats a hospital, lecture halls and sports activities arenas throughout campus.
It all begins with a natural gas or gas-powered jet engine. Hot air coming off the engine spins a turbine that generates electricity.
“All that sizzling air coming off the jet engine then goes into this giant gray field,” mentioned Jerome Malmquist, the university’s power administration director throughout a tour this week. “This large grey box is like an incredible large tea kettle. We’re not making tea, we’re making sizzling water or steam.”
It’s exhausting to visualize as a result of all of the burning, spinning and moving steam round is happening inside giant enclosures and pipes all through the plant.
The steam travels via miles of pipes inside tunnels which might be 90 toes underground. Steam shoots by means of fat pipes — sometimes as a lot as 550,000 to 600,000 pounds per hour, Malmquist stated.
Many of the steam makes its means back to the plant as hot water, the place it’s used once more to make more steam.
All of this capturing and reusing of heat makes the plant 83 percent environment friendly.
“We’re very happy with that,” Malmquist mentioned, noting that the majority standalone energy plants are less than half as environment friendly, meaning there’s numerous heat that goes to waste.
“It’s a little bit-identified proven fact that in producing energy in the United States, two-thirds of the vitality is thrown away. Type of like shopping for a six-pack of beer and 88 petroleummpany ordinance pouring 4 of them out,” stated Mark Spurr, an power marketing consultant with FVB Energy.
FVB studied combined heat and energy in Minnesota a few years ago and really useful doubling the technology’s capacity within the state by 2030.
Minnesota has greater than 50 combined heat and energy services of all different types, in line with the Department of Energy, but most of them are small. Spurr said the expertise can go into new plants or be part of retrofits in present plants.
“It’s not an unknown know-how. It is simply that there is so way more potential,” he said.
However there are several obstacles. There’s no one-measurement-suits-all 88 petroleummpany ordinance solution for a given site because everybody has different wants for power and heat. Financing can be a problem, and traditionally utilities have not needed universities, cities and 88 petroleummpany ordinance others to generate their own power.
Malmquist said the University of Minnesota worked with Xcel Vitality on a plan that may tackle both events’ needs. The university needed the plant because it may both save money on utilities and make the campus more resilient to energy outages.
The plant does not produce enough electricity to keep the whole lot operating throughout the case of an outage, but precedence power makes use of such as hospitals and delicate analysis would receive uninterrupted service.
Capturing the heat means the expertise also reduces carbon emissions — the college expects its carbon footprint to go down by 10 to thirteen %. However many mixed heat and power methods nonetheless rely on burning fossil fuels, so some query their skill to make a giant sufficient dent in emissions causing local weather change. For example, pupil and school protests halted an analogous venture at Duke College earlier this yr.
In Minnesota, clear power advocates have been supportive of combined heat and energy.
“Minnesota should invest in least-cost renewables and maximize that in our state,” mentioned Will Nissen, director of vitality performance at Recent Energy. “Where projects are possible and the sites make sense, combined heat and energy tasks ought to move ahead.”
There’s a giant combined heat and energy plant going in next yr at Flint Hills Assets — the oil refinery in Rosemount, Minn. But even with that addition, the capability of combined heat and energy plants in Minnesota will likely be lower than half what the state’s largest coal-fired power plant — Sherco in Sherburne County — can produce.