It might soon be possible for natural gas power plants to use about 20 percent less fuel when the sun is shining by injecting solar energy into natural gas with a new system under development.
The system converts natural gas and sunlight into a more energy-rich fuel called syngas, which power plants can burn to make electricity.
“Our system will enable power plants to use less natural gas to produce the same amount of electricity they already make,” said the Department of Energy’s (DoE) Pacific Northwest National Laboratory (PNNL) Engineer Bob Wegeng, who is leading the project. “At the same time, the system lowers a power plant’s greenhouse gas emissions at a cost that’s competitive with traditional fossil fuel power.”
PNNL will conduct field tests of the system at its campus in Richland, WA, this summer.
With the U.S. increasingly relying on inexpensive natural gas for energy, this system can reduce the carbon footprint of power generation. DoE’s Energy Information Administration estimates natural gas will make up 27 percent of the nation’s electricity by 2020. Wegeng said PNNL’s system works best in power plants located in sunshine-drenched areas such as the American Southwest.
Installing PNNL’s system in front of natural gas power plants turns them into hybrid solar-gas power plants. The system uses solar heat to convert natural gas into syngas, a fuel containing hydrogen and carbon monoxide. Because syngas has a higher energy content, a power plant equipped with the system can consume about 20 percent less natural gas while producing the same amount of electricity.
This decreased fuel usage is possible with concentrating solar power, which uses a reflecting surface to concentrate the sun’s rays like a magnifying glass. PNNL’s system uses a mirrored parabolic dish to direct sunbeams to a central point, where a PNNL-developed device absorbs the solar heat to make syngas.
About four feet long and two feet wide, the device contains a chemical reactor and several heat exchangers. The reactor has narrow channels as wide as six dimes stacked on top of each other. Concentrated sunlight heats up the natural gas flowing through the reactor’s channels, which hold a catalyst that helps turn natural gas into syngas.
The heat exchanger features narrower channels that are a couple times thicker than a strand of human hair. The exchanger’s channels help recycle heat left over from the chemical reaction gas. By reusing the heat, solar energy is more efficient in its ability to convert natural gas into syngas. Tests on an earlier prototype of the device showed more than 60 percent of the solar energy that hit the system’s mirrored dish converted into chemical energy contained in the syngas.
PNNL is refining the earlier prototype to increase its efficiency while creating a more cost sensitive design. The project includes developing cost-effective manufacturing techniques that could work in mass production. The manufacturing methods will end up developed by PNNL staff at the Microproducts Breakthrough Institute, a research and development facility in Corvallis, OR, jointly managed by PNNL and Oregon State University.
Wegeng’s team aims to keep the system’s overall cost low enough so the electricity produced by a natural gas power plant equipped with the system would cost no more than 6 cents per kilowatt-hour by 2020. Such a price tag would make hybrid solar-gas power plants competitive with conventional, fossil fuel-burning power plants while also reducing greenhouse gas emissions.
The system is adaptable to a large range of natural gas power plant sizes. The number of PNNL devices needed depends on a particular power plant’s size. For example, a 500 MW plant would need roughly 3,000 dishes equipped with PNNL’s device.
Unlike many other solar technologies, PNNL’s system doesn’t require power plants to cease operations when the sun sets or clouds cover the sky. Power plants can bypass the system and burn natural gas directly.
Wegeng also envisions a day when PNNL’s solar-driven system could create transportation fuels. Syngas can also make synthetic crude oil, which can then refine into diesel and gasoline.