CO2 Energy Storage System - Compressed Gas - Closed Loop

tahanson43206 · 2024-02-15 20:07:32

We have a lot of topics that include the word "storage" in the title.

Now we have one more.

This is a closed storage system, that uses CO2. What is interesting is the scale...

https://www.msn.com/en-us/money/other/d … 121a&ei=31

This project will be the largest energy storage system of its kind in the world.
© Provided by The Cool Down
A first-of-its-kind project for the United States has received a grant of up to $30 million from the government, the project’s developers announced.
Alliant Energy and WEC Energy Group, co-owners of Wisconsin’s Columbia Energy Center, will use the funding from the Office of Clean Energy Demonstrations to create the country’s first compressed carbon dioxide long-duration energy storage system.
The idea of the system is that it can turn carbon dioxide gas into a liquid for easier storage when energy is abundant. When energy is needed, it turns the carbon dioxide back into gas, which then powers an electricity-generating turbine.
Crucially, the setup operates as a closed-loop system, meaning that it should release no carbon dioxide and require no additional carbon dioxide after it is built out.
In addition to being first in the U.S., the Columbia Energy Storage Project will be the largest compressed carbon dioxide long-duration energy storage system in the world. A much smaller version of the same project is already operational in Sardinia, Italy. The two projects were designed by the same company, Energy Dome, which is based in Italy.
The Sardinia system has achieved an enviable 75% efficiency rate — which the much larger Wisconsin one will hope to match.
Currently, the Columbia Energy Center is Wisconsin’s largest remaining coal plant. It was supposed to be retired in 2024, but that date was pushed back to mid-2026. Its eventual transition into a much more sustainable battery storage system is good news for Wisconsinites and the planet.
“The expansion of energy storage infrastructure is key to accelerating the transition to cleaner, more sustainable renewable energy,” a spokesperson for Alliant said. “As we retire older fossil fuel facilities and add additional renewable resources to our generation portfolio, energy storage solutions help to ensure system reliability and meet customer needs.”

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tahanson43206 · 2024-02-15 20:08:06

This post is reserved for an index to posts our members may add.

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Calliban · 2024-02-16 04:37:35

CO2 has the advantage over compressed air that it can be compressed to a saturated liquid at ambient temperatures, with enough pressure. A saturated liquid is a much denser storage medium than a compressed gas and makes better use of pressure vessels. The downside is that exhaust CO2 from the energy recovery step must be captured and reused, as CO2 is a trace gas in air. A large tank or inflatable vessel is needed, which adds to cost and land used. Still, pressure vessels are expensive to engineer. Ambient pressure tanks are not. So overall, the concept likely has a cost advantage over CAES.

There are other gases that we could use that also have the right phase properties to liquefy at ambient temperature. Propane and butane, for example. But CO2 is cheap and non-flammable, so is the best choice. The size of the tank makes this unsuitable for long-term energy storage of large quantities of energy. This is a technology that directly competes with batteries for grid frequency control. But it is far more sustainable and environmentally freindly than batteries. This is a thermodynamic device. The main components involved can be made from abundant materials. A compressor, a liquid CO2 pressure vessel, a gas turbine for energy recovery and a telescopic steel expansion tank, which would be very similar to those old gasometer tanks that we have been building for 200 yesrs now.

It is also possible to integrate this system into a district heat delivery system. As the CO2 is compressed, the compressor will generate heat that can be put into a district heat network. During reexpansion, we can use ambient heat stored in a borehole to reheat the CO2 as it expands. We get slightly lower round trip efficiency doing this, but the hot water is a valuable product in itself, provided we have a way of delivering it. This is a system that could be developed small scale for individual houses or a clustered group of houses.

Another option for closed cycle pressurised gas storage, is to employ adiabatic compression and expansion. When gas is compressed, it heats up, because work is done on the gas increasing its internal energy. When it expands the reverse happens, as internal energy is converted into kinetic energy. With adiabatic expansion, i.e without reheat of the gas between expansion stages, the gas that emerges from the turbine exhaust is extremely cold, not far above the dry ice sublimation point. The work extracted by the turbine from each unit mass of gas will be lower, maybe only half what could be extracted from the gas under isothermal expansion conditions. But conversely, the work required by the compressor to reliquefy the gas will also be much lower. So round trip efficiency will not be effected. What advantage does this provide? Simpler and cheaper compressors and turbines, without need for reheat or interstage cooling.

Last edited by Calliban (2024-02-16 05:15:06)

tahanson43206 · 2024-02-16 07:09:56

For Calliban re #2

Thank you for your review of this new storage system....

A detail that may have escaped your careful reading of the article is that the CO2 is ** not ** released.

This is a closed system.

I see a distinct business case for this particular technology. There are incentives in place for carbon capture, and this means the business may be able to obtain otherwise expensive (energy cost) CO2 for a low price or even be paid to accept it.

Since the CO2 is sequestered in the system, there will be little additional expense except for leakage.

I expect to see a successful commercial future for this technology.

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Terraformer · 2024-02-16 11:32:44

Calliban,

Are you proposing that the gaseous co2 be stored at low temperature, so that it is easier to reliquify?

I'm still thinking water's latent heat is the best choice to provide the reheat. Water can be stored close to ambient temperature, and if the ice melts that's just extra energy added to the system. For much of the year, we could make up energy losses using heat from the air to provide additional melting. If we're using air, cold water can be used for the prechilling part to remove water vapour perhaps.

SpaceNut · 2024-02-16 17:25:29

A geothermal-powered, climate-friendly way to capture carbon dioxide in the air

BB1ioU6I.img?w=768&h=607&m=6

Direct Air CO2 Capture with CO2 Utilization and Storage (DACCUS)

Living off the land

Calliban · 2024-02-16 19:11:27

Terraformer wrote:

Calliban,
Are you proposing that the gaseous co2 be stored at low temperature, so that it is easier to reliquify?
I'm still thinking water's latent heat is the best choice to provide the reheat. Water can be stored close to ambient temperature, and if the ice melts that's just extra energy added to the system. For much of the year, we could make up energy losses using heat from the air to provide additional melting. If we're using air, cold water can be used for the prechilling part to remove water vapour perhaps.

Yes. If the CO2 exhaust has low temperature, then liquefaction requires less energy. There is no free lunch here in energy terms, as the avoidance of reheat within the cycle reduces recoverable energy. But it will make the turbine and compressor easier to design, as there do not need to be any (or at least fewer) intercooling and reheat stages, for the compressor and turbine, respectively.

If we could find some way of using the cold from adiabatic expansion, then we get the best exergy efficiency all round. Compression generates heat that provides hot water. Expansion generates work and cold energy, which can be used for other applications, like refrigeration. Compressed air energy storage can function as a sort of heat pump. Compression allows us to remove thermal energy from air for heat and expansion converts internal energy into work, lowering the temperature of the air. Given that refrigeration is something we normally use additional energy for, it would be really neat if we could use a single heat pump to provide both heat (for hot water) and cold for refrigeration.

One example of how we might use this. If we build a ice rink next door to a swimming pool. A CAES type facility would generate heat from compression that could warm the pool. The expander turbine would generate cold, which could cool the ice rink. If a town has a district heating network able to absorb compression heat, we could build a year round ski slope, complete with snow under an ETFE canopy. The CAES exhaust air could be vented under the canopy, keeping the slope frozen.

SpaceNut · 2024-02-17 16:13:21

A container ship just tested a system to capture its own CO2 emissions

SpaceNut · 2024-02-19 08:56:38

New tech turns CO2 into chemicals with 93% efficiency, runs record 5000 hrs

New Mars Forums

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#1 2024-02-15 20:07:32

CO2 Energy Storage System - Compressed Gas - Closed Loop

#2 2024-02-15 20:08:06

Re: CO2 Energy Storage System - Compressed Gas - Closed Loop

#3 2024-02-16 04:37:35

Re: CO2 Energy Storage System - Compressed Gas - Closed Loop

#4 2024-02-16 07:09:56

Re: CO2 Energy Storage System - Compressed Gas - Closed Loop

#5 2024-02-16 11:32:44

Re: CO2 Energy Storage System - Compressed Gas - Closed Loop

#6 2024-02-16 17:25:29

Re: CO2 Energy Storage System - Compressed Gas - Closed Loop

#7 2024-02-16 19:11:27

Re: CO2 Energy Storage System - Compressed Gas - Closed Loop

#8 2024-02-17 16:13:21

Re: CO2 Energy Storage System - Compressed Gas - Closed Loop

#9 2024-02-19 08:56:38

Re: CO2 Energy Storage System - Compressed Gas - Closed Loop

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