Carbon Capture Technology

"Am donating $100M towards a prize for best carbon capture technology" said Elon Musk, the billionaire tech entrepreneur, in one of his recent tweets. Carbon capture and storage (CSS) is the process of capturing and storing waste carbon dioxide before it is emitted into the atmosphere. The technology can capture up to 90% of the carbon dioxide released by burning fossil fuels and from emissions from vehicles in electricity generation and industrial processes. The technology also reduces pollutants like sulfur oxides, nitrogen oxide, carbon monoxide, and particulates. 

The first carbon capture plant was proposed in 1938, and the first large-scale project to inject CO2 into the ground, launched in the Sharon Ridge oilfield in Texas in 1972. There have been significant developments in the next few years. Around 24 years later, Norway launched the world’s first integrated carbon capture and storage project, known as Sleipner, in the North Sea. The technology is still under development, and many projects have been set up to make it work more effectively. 

Carbon dioxide is often captured directly from an industrial source, like a cement kiln, by employing different sorts of technologies; including absorption, adsorption, chemical looping, membrane gas separation, or gas hydrate technologies. As of 2019, there are 17 operating CCS projects within the world, capturing 31.5Mt of CO2 per annum, of which 3.7 is stored geologically. Most are industrial not power plants. Industries like cement, steelmaking, and fertilizer production are hard to decarbonize.

There are both, good and bad ways to develop, set-up, and use different carbon removal options. Carbon removal contains many uncertainties, both in terms of the potential risks related to the large-scale deployment and many of the approaches too because of the ultimate potential risk of carbon removal.

The Main Types of Carbon Capture

Technology	Benefits	Main Challenges
Solvents	Well-developed High capture rate Retrofittable	Relatively low efficiency High energy requirements Integration with base plant
Sorbent	Energy efficient High capture rate	Sorbent longevity/attrition Heat Transfer
Membranes	Energy efficient Simple and Modular	Low optimal capture rate
Cryogenic Systems	Energy efficient Retrofittable	Solids handling Fouling
Oxy-combustion	Energy Efficient High capture rate	Process integration Oxygen separation cost
Direct Air Capture	Modular Less infrastructure needed	Low efficiency Degradation of materials

None of the technologies presented above are yet proven to work at scale, and each raises a set of environmental and social benefits and risks that are still poorly understood. But if the policies and technologies are implemented properly, carbon capture can be used to provide a carbon negative environment. 

Carbon capture and storage (CCS) technologies could significantly reduce greenhouse emission emissions, allowing utilities to stay using abundant and efficient fossil fuels to get reliable and affordable power. Some of the advantages of CSS are:

• Generate additional power: CO2-based steam cycles, during which CO2 is pressurized into a supercritical fluid, could transfer heat more readily and take less energy to compress steam, helping power generation turbines run more efficiently. Additionally, geologically stored CO2 might be wont to extract geothermal heat from an equivalent location during which it’s injected, producing renewable heat.

• Create more fuel: Technically, it’s possible to convert CO2 into fuel. There are multiple ways to accomplish this, but they’re difficult in terms of cost and process.

• Enrich concrete: Captured CO2 might be able to strengthen concrete, resulting in increased infrastructure durability.

• Bolster manufacturing operations: CO2 could be used to make chemicals and plastics, such as polyurethanes which are used to create soft foams and other materials like those used in mattresses and beds.

• Create new jobs: If more CCS operations were implemented, more skilled and educated technicians would be needed to manage and control them.