If carbon dioxide is transformed 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 the Lawrence Livermore National Laboratory have designed an energy storage method that can store the additional electricity generated by renewable energy and traditional energy sources while also “locking in†the main culprit causing global warming. carbon dioxide.
Carbon capture and storage technology has been slow to develop, partly because energy suppliers need to pay more for this, but they have almost no direct return. Tom Bushicek of the Lawrence Livermore National Laboratory said that if the stored carbon dioxide can be used to “charge†excess energy, the economic benefits will be able to advance the technology.
According to a report on the website of the “New Scientist†magazine on the 20th, the team at the European Union of Earth Sciences held by the Bushec team recently proposed that excess energy can be stored in two forms: pressure and heat. The pump was driven with excess electricity to inject supercritical carbon dioxide, a mixture of liquids and gases, into subterranean brines in sedimentary rocks ranging from 5 km to 10 km deep. The underground salt water is connected to another set of pipes, and the pumped carbon dioxide can replace some of the salt water and be taken to the ground.
The excess energy can also be used to heat the salt water and allow it to flow into deeper rocks, effectively storing heat. When hot salt water comes in contact with carbon dioxide, it can cause carbon dioxide to expand and the pressure increases. By depressurizing CO2, heat can be re-collected and used to drive a supercritical CO2 turbine, which is 50% more efficient than a steam turbine. The research team's model shows that this system can re-collect up to 96% of the stored heat.
The new method can help solve one big problem of renewable energy: intermittent supply of electricity. This huge underground "battery" technology is cutting edge, but the cost of energy storage is very high and not very effective - about a quarter of the energy is wasted throughout the process.
But in the opinion of Peter Cook of the University of Melbourne, this proposal integrates a large number of existing methods in a new way, which means that the technology has matured a large part. "There is no doubt that we need to consider this kind of hybrid technology," he said. Although this may help reduce carbon dioxide in the atmosphere, it is unlikely to be a major carbon sink.
Bushech said that a site can store only 8 million tons of carbon dioxide (equivalent to the emissions from a large coal power plant) annually for 30 years, and they are seeking to cooperate with the power company to conduct pilot projects.
Cook and Jim Anders Schultz of the University of Queensland believe that whether this design can be scaled up remains to be seen. Anders Schultz said that due to its complexity, costs may be high and efficiency is getting lower and lower. Stewart Hazeldin of the University of Edinburgh also stated that it is necessary to have a good understanding of the geological conditions in order to ensure that the sequestered carbon dioxide does not escape. (Reporter Chen Dan)
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