Carbon dioxide can become a giant underground "battery"
Can store extra power and “lock†greenhouse gases
If carbon dioxide is turned from waste into a giant "battery", not only will carbon storage be rewarded, but it will also solve the problem of unsustainable supply of renewable energy. Researchers at Lawrence Livermore National Laboratory have designed such an energy storage method that can store additional electricity from renewable and traditional energy production, as well as “lock in†the main cause of global warming. carbon dioxide.
Carbon capture and storage technologies have been slow to develop, in part because energy suppliers need to pay more for this, but there is almost no direct return. Tom Bushchick, of Lawrence Livermore National Laboratory, said that if stored carbon dioxide can be used to "load" excess energy, the economic benefits will drive the technology forward.
According to the "New Scientist" magazine website on the 20th, the Brichek research team at the recent European Union of Earth Science Conference proposed that excess energy can be stored in two forms: pressure and heat. Supercritical carbon dioxide, a mixture of liquid and gas, is injected into the underground brine in sedimentary rocks between 5 and 10 kilometers deep. The underground brine is connected to another set of pipes, and the pumped carbon dioxide can replace some of the brine and be taken to the ground.
Excess energy can also be used to heat the brine and allow it to flow deeper into the rock, effectively storing the heat. When hot brine comes into contact with carbon dioxide, it causes carbon dioxide to swell and the pressure increases. By decompressing carbon dioxide, heat can be re-collected to drive a supercritical carbon dioxide turbine that is 50% more efficient than a steam turbine. The research team's model shows that this system can recollect up to 96% of stored heat.
The new approach can help solve a big problem with renewable energy: the intermittent supply of electricity. This huge underground “battery†technology is cutting-edge, but the energy storage costs are very high and not very effective – about a quarter of the energy is wasted in the entire process.
But in the eyes of the University of Melbourne's Peter Cook, the proposal combines a large number of existing methods in a new way, meaning that the technology has matured a large part. “There is no doubt that we need to consider this hybrid technology.†He said that while this may help reduce carbon dioxide in the atmosphere, it is unlikely to be a major carbon sink.
Bushichek said that a site can only store 8 million tons of carbon dioxide per year (equivalent to emissions from a large coal-fired power plant) in 30 years, and they are seeking to work with power companies to carry out pilot projects.
Cook and Jim Andh Schultz of the University of Queensland agree that it remains to be seen whether this design will expand. And Schulz said that due to its complexity, costs can be high and efficiency is getting lower. Stewart Hazeldin of the University of Edinburgh also said that it is necessary to have a good understanding of the geological conditions to ensure that the sealed carbon dioxide will not escape.
It is easy to spray energy from the ground. If you want to temporarily return it to the ground, you can be in trouble. Scientists have devised a variety of sophisticated technologies that are designed to clean up energy consumers. In fact, the best way is to use energylessly and make the effect as high as possible. In the past two hundred years, we have been digging up fossil energy, and many people are as restrained as nouveau riche. It’s a pity to waste, please turn down the fire.
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