Emissions of carbon dioxide (CO2) are either natural or anthropic (due to human activity). Natural emissions are ones from natural wildfire, animal breathing, plants, aquatic microorganism, the ground or even volcanic origin. Anthropic emissions come from heating, vehicles, voluntary fire, power generation station of fossil fuels.
Since the Industrial Revolution, human sources of carbon dioxide emissions have been growing. Human activities such as the burning of oil, coal and gas, as well as deforestation, are the primary cause of the increased carbon dioxide concentrations in the atmosphere. Combustible fossil fuels such as coal, power plant gas, oil, vehicles and big industry are the largest source of carbon dioxide. The production is from various items such as iron, steel, cement, natural gas, solid waste combustion, lime, ammonia, limestone, soda ash, aluminium, petrochemical. Carbon dioxide accounts for nearly 85 per cent of all emissions and is produced when natural gas, petroleum and coal are used. The major areas where these fuels are used include electricity generation, transportation, industry and residential and commercial buildings.
2. CONSEQUENCES OF CO2 ON ENVIRONMENT
As CO2 is naturally present in the air, it’s not harmful to living organism. But CO2 emissions are also accompanied by heavy metals, different contaminant. Which, all together, provoke deleterious effects on a living organism. This latest is sensitive to variations of the CO2 concentrations in the atmosphere. This emission has consequences on wildlife and plants.
For birds and mammals: The carbon can kill by asphyxiation at a certain level and time of exposition. Its chemical property, higher than oxygen, permits it to be able to rapidly cross numerous types of the biological membrane (including the central nervous system).
In the oceans: The circulation of oceans is also affected by human carbon emissions. It makes oceans more acidic. Thus, numerous fish can wind up to the poles, where the water temperature changes less rapidly. Regarding ocean current, they could slow down, or even stop. The CO2 absorbed could be released and worsen climate change.
For the plants: with a low dose, the CO2 can permit the growth of so many vegetal species. After experiences, this has been proven, but until a certain level. When this level is overpassed, the growth of vegetal stabilize or reduce
Climate change: It continues to play a significant role in the destruction of the ecosystem. Global warming has led to increased temperatures, sea levels and ocean acidity that disrupt an ecosystem’s natural balance.
3. WHAT IS CO2 CAPTURE AND STORAGE
CO2 can be captured from large point sources, such as large fossil fuel or biomass electricity power plants, industries with major CO2 emissions, natural gas processing, synthetic fuel plants and fossil fuel-based hydrogen production plants. Capture from the open atmosphere is also possible. Carbon capture has actually been in use for years. The oil and gas industries have used carbon capture for decades as a way to enhance oil and gas recovery. Only recently have we started thinking about capturing carbon for environmental reasons.
Currently, most research focuses on carbon capture at fossil fuel-powered energy plants, the source of the majority of man-made CO2 emissions. Many of these power plants rely on coal to create energy, and the burning of coal emits CO2 into the atmosphere. Some researchers envision a future where all new power plants employ carbon capture. There are three main steps to carbon capture and storage (CCS) –
Trapping or Capturing
Separating the CO2 from other gases,
Transporting this captured CO2 to a storage location, and storing that CO2 far away from the atmosphere (underground or deep in the ocean).
Carbon is taken from a power plant source in three basic ways — post-combustion, pre-combustion and oxyfuel combustion. A fossil fuel power plant generates power by burning fossil fuel (coal, oil or natural gas), which generates heat that turns into steam. That steam turns a turbine connected to an electricity generator. Let’s take a more detailed look at the trapping and separation process:
3.1 Post Combustion capturing
Post-combustion CO2 capture refers to the removal of CO2 from combustion flue gas prior to discharge to the atmosphere. It is referred to as “post-combustion capture” because the CO2 is the product of the combustion of the primary fuel and the capture takes place after the combustion of that fuel.
With post-combustion carbon capture, the CO2 is grabbed after the fossil fuel is burned. This process is currently in use to remove CO2 from natural gas. The biggest benefit to using this process is that it allows us to retrofit older power plants, by adding a “filter” that helps trap the CO2 as it travels up a chimney or smokestack. This filter is actually a solvent that absorbs carbon dioxide. The solvent can later be heated, which will release water vapour and leave behind a concentrated stream of CO2. Post-combustion carbon capture can prevent 80 to 90 per cent of a power plant’s carbon emissions from entering the atmosphere, but the post-combustion process requires a lot of energy to compress the gas enough for transport.
Figure 1: Post-Combustion CO2 capture
In a typical fossil fuel-fired steam generating unit, fuel is burned with air in a boiler to produce steam that drives a turbine/generator to produce electricity. The burning of fossil fuels produces flue gases, which include CO2, water vapour, sulfur oxides (SOx), nitrogen oxides (NOx), hydrochloric acid (HCl) etc. In a post-combustion process, CO2 is separated and captured from the flue gases
The CO2 capture process is located downstream of the conventional pollutant controls for removal of Particulate matter and acid gases so these components will not interfere with CO2 removal. Challenges to separating CO2 from steam generating unit combustion flue gas include:
The high volume of gas to be treated because the CO2 is dilute (13–15 volume percent in coal-fired systems);
The low pressure [15–25 pounds per square inch (psi)] of the flue gas;
The large auxiliary power load to compress captured CO2 from near atmospheric pressure to pipeline pressure (about 2,200 psi).
3.2 Pre-combustion CO2 capture
Pre-combustion CO2 capture, as its name implies, takes place before the process gas is combusted to generate steam at a power plant. CO2 is trapped before the fossil fuel is burned. That means the CO2 is trapped before it’s diluted by other flue gases. Pre-combustion capture is applicable mainly to IGCC processes where fuel is converted into gaseous components by applying heat under pressure in the presence of steam and limited O2.
Figure 2: Pre-Combustion CO2 capture.
Coal, oil or natural gas (usually coal or petroleum coke at electric utilities) is heated with, water and oxygen in an oxygen-lean environment. Unlike a boiler, a gasifier carefully controls the amount of air or oxygen available inside it so only a small portion of the fuel burns completely. This “partial oxidation” process provides heat to drive gasification reactions. Rather than burning, most of the fuel is chemically broken apart by the heat and pressure in the gasifier, setting into motion chemical reactions that produce syngas. The fuel (carbon), water and oxygen react to form primarily a mixture of hydrogen (H2) and carbon monoxide (CO) known as synthesis gas or “syngas” according to the following high-temperature reaction:
3C + H2O + O2 H2 + 3CO
Although syngas is predominantly H2 and CO, it can include other gaseous constituents (e.g., hydrogen sulfide (H2S), carbonyl sulfide (COS), and CO2) in varying compositions depending on fuel characteristics and the conditions in the gasifier. Most syngas streams are at a higher pressure and can contain higher concentrations of CO2 than conventional steam generating units (especially if the syngas is shifted to enrich the CO2 concentration).
Pre-combustion capture systems have been used widely in industrial processes such as natural gas processing. The pre-combustion process is lower in cost, but it’s not a retrofit for older power plant generators. As with post-combustion, pre-combustion carbon capture can prevent 80 to 90 per cent of a power plant’s emissions from entering the atmosphere.
3.3 Oxy-combustion CO2 capture
Oxy-combustion (or oxy-fuel) refers to the replacement of air, either in the boiler or the gasifier, with pure oxygen (O2). Purified O2 helps to eliminate unwanted byproducts present in the air, and also increases the CO2 purity of the resulting syngas or flue stream, making CCS more effective. The oxygen required for this technique increases costs, but researchers are developing new techniques in hopes of bringing this cost down. Oxy-fuel combustion can prevent 90 per cent of a power plant’s emissions from entering the atmosphere.
Oxy-combustion overcomes the technical challenge of low CO2 partial pressure normally encountered in conventional coal combustion flue gas by producing a highly concentrated CO2 stream, which is separated from water vapour by condensing the water through cooling and compression.
The appeal of oxy-combustion is tempered by a few key challenges, including the capital cost and energy consumption for a cryogenic air separation unit (ASU), boiler air infiltration that dilutes the flue gas with N2, and excess O2 contained in the concentrated CO2 stream.
Figure 3: Oxy-Combustion CO2 capture
Comparison of Three Technologies:
4. CO2 SEPARATION TECHNIQUES
Based on economic and environmental considerations, it is necessary to apply efficient and suitable technology for CO2 separation with low operating cost and energy consumption. Up to now, there are several gas separation technologies being investigated for post-combustion capture, namely,
(c) Cryogenic distillation, and
(d) Membrane separation
Although various new methods were suggested for CO2 separation, Granite and Brien reviewed some of the most novel methods for carbon dioxide separation from the flue and fuel gas streams, such as the use of electrochemical pumps and chemical looping for CO2 separation.
Figure 4: Separation Techniques
4.1 Gas Absorption Amines
Gas absorption processes using chemical solvents, such as amines, to separate CO2 from other gases have been in use since the 1930s in the natural gas industry to produce food and chemical grade CO2. As absorbents, most commonly used are monoethanolamine (MEA), diethanolamine (DEA), methylodiethyloamine (MDEA) and triethanolamine (TEA). Low purchase costs and the availability of monoethanolamine (MEA) makes it the most popular sorbent, despite some obvious limitations.
The flue gas (containing CO2) is cooled (between 318 and 323 K), and fed to the absorption column (scrubber) where the solvent absorbs CO2. The CO2-rich solution is fed into a heater to increase the temperature of the solution, then to a stripper column to release the CO2. The released CO2 is compressed, and the regenerated absorbent solution is cooled and recycled to the absorber column. Solvent regeneration is responsible for much of the “energy penalty” of the CO2 capture system because the steam that could otherwise be used to generate electricity is instead used in the solvent regeneration process. Development of advanced solvents – those that are chemically stable, have high CO2 absorption capacities, and have low regeneration energy requirements – continues to be an active area of research.
Amines chemically react with CO2 via reversible reactions to form water-soluble compounds. Despite the low CO2 partial pressure in combustion flue gas, amines are capable of achieving high levels of CO2 capture due to fast kinetics and strong chemical reactions. However, the absorption capacity for commercially available amines is chemically limited, requiring two molecules of amine for each molecule of CO2. In addition, usable amine solution concentrations are typically limited by viscosity and corrosion. Therefore, current amine systems are only between 20 and 30 per cent amine with the remaining being water. Although the water present in the solution helps control the solvent temperature during absorption, which is an exothermic reaction, the water also requires significant amounts of sensible heating and stripping energy upon CO2 regeneration.
Figure 5: Gas Absorption by MEA
4.1.1 Famous Solvents For Absorption
(1) Alkanolamines: Between various solvent groups, alkanolamines group is the most important and more used for CO2 A major problem in the usage of amines for CO2absorption is equipment corrosion, the corrosion rate of various amine solvents and suggested corrosion rate could reduce in the following order:
(2) Amino Acid:. Amino acids have the same functional groups as alkanolamines and can be expected to behave similarly towards CO2 but do not deteriorate in the presence of oxygen. The most common amino acids used in the gas treating solvents are glycine, alanine, dimethyl glycine, diethyl glycine, and a number of sterically hindered amino acids.
(3) Ammonia: Since ammonia is a toxic gas, prevention of ammonia “slip” to the atmosphere is a necessity. Despite this disadvantage, the chilled ammonia process (CAP) was used for CO2 separation. In the CAP, CO2 is absorbed in an ammoniated solution at a lower absorption temperature (275–283 K) that reduced ammonia emissions from the CAP absorber. Ammonium carbonate solution resulted in approximately 38% carbon regeneration compared to MEA solution.
Adsorption operation can reduce the energy and cost of the capture or separation of CO2 in post-combustion capture. To achieve this goal, it is necessary to find adsorbents with suitable properties. In general, CO2 adsorbent must have high selectivity and adsorption capacity and adequate adsorption/desorption kinetics, remain stable after several adsorption/desorption cycles and possess good thermal and mechanical stability. The method consists in condensation of vapour and gases on the surface of a solid adsorbent as a result of molecular forces and uses the differences in sorption capacity of particular components of the separated gas mixture on a given adsorbent. The adsorbents used for CO2 separation placed into two main categories: physical and chemical adsorbents
A) Activated carbon (AC):
It has a number of attractive characteristics, such as its high adsorption capacity, high hydrophobicity, low cost, and low energy requirement for regeneration. Activated carbons are inexpensive, insensitive to moisture, and easy for regeneration. These adsorbents have well developed micro- and mesopore structures that are suitable for high CO2 adsorption capacity at ambient pressure.
Activated carbon may be produced from many raw materials such as coal, coke pitch, wood or biomass sources (e.g., sawdust, coconut shells, olive stones), often via two steps: carbonization and activation. Carbon molecular sieves (CMS), which are a sub-class of activated carbon with narrow pore size distribution (PSD), are kinetic-based adsorbents. They have been commercialized mainly for the separation of air and the production of high purity N2. However, at low CO2 partial pressure, activated carbons exhibit lower adsorption capacity and selectivity than zeolites mainly due to their less favourable adsorption isotherms. In spite of the hydrophobic character of carbon-based adsorbents, their CO2 adsorption ability is adversely affected by the presence of water vapour.
Among the adsorbents, the most popular are zeolite and carbon adsorbents, which constitute an adsorption bed when filling the adsorption tower. For the process to be carried out continuously, at least two adsorption towers are required. In practice, multi-bed systems are used which benefits the effectiveness of the process.
CO2/N2 selectivities of activated carbon are relatively low; zeolitic materials offer CO2/N2 selectivities 5–10 times greater than those of carbonaceous materials. The adsorption capacity and selectivity of zeolites are largely affected by their size, porous diameter, charge density, and chemical composition of cations in their porous structures. The average value of heat adsorption on zeolites is larger than for activated carbon, confirming the mentioned affirmation. Moreover, activated carbon can be regenerated easily and completely. Also, its capacity did not decay after 10 consecutive processes cycles.
C) Carbon nanotubes (CNTs):
They are the most famous among nano-hollow structured materials and their dimension ranges from 1 to 10 nm in diameter and from 200 to 500 nm in length. Purified single-walled carbon nanotubes (SWNTs) adsorbed CO2 better than unpurified SWNT. In addition, multiwalled carbon nanotubes (MWNTs) showed stability for 20 cycles of adsorption and regeneration.
D) MOFs and zeolite-like MOFs:
Carbon dioxide adsorbs to a MOF Metal Organic Framework through physiosorption or chemisorption based on the porosity and selectivity of the MOF leaving behind a Greenhouse gas poor gas stream that is more environmentally friendly. The carbon dioxide is then stripped off the MOF using temperature swing adsorption (TSA) or pressure swing adsorption (PSA) so the MOF can be reused. Adsorbents and absorbents require regeneration steps where the CO2 is removed from the sorbent or solution that collected it out of the flue gas in order for the sorbent or solution to be reused.
Although an emerging class of porous materials, metal organic frameworks (MOFs) have attracted a growing interest, motivating extensive studies on their CO2 adsorption properties, both theoretically and experimentally. MOFs are porous crystalline materials composed of self-assembled metallic species and organic linkers. Their pore size and shape can be easily tuned by changing either the organic ligands or the metallic clusters. They are typically rigid materials, but some of them exhibit structural flexibility upon adsorption and desorption of gases or liquids. The wide range of MOFs combined with their desirable properties such as their remarkably high surface area and controlled pore size and shape, prompted extensive work on their adsorptive properties, particularly for storage of light gases (H2, CH4) and storage and separation of CO2. Although the majority of investigations on CO2 adsorption over MOFs used pure CO2, as well as CO2-containing mixtures, most measurements and simulations were carried out at high pressure and often at room or subambient temperature.
4.2.1 Regeneration Cycles for CO2 Adsorption
Five different regeneration strategies were demonstrated in a single-bed CO2 adsorption unit: pressure swing adsorption (PSA), temperature swing adsorption (TSA), vacuum swing adsorption (VSA), electric swing adsorption (ESA), and a combination of vacuum and temperature swing adsorption (VTSA). The difference between these technologies is based on the strategy for regeneration of adsorbent after the adsorption step. In PSA applications, the pressure of the bed is reduced. VSA is preferred to the special PSA application where the desorption pressure is below atmospheric, whereas in TSA, the temperature is raised while pressure is maintained approximately constant, and in ESA the solid is heated by the Joule effect.
4.3 Membrane Separation
The membrane separation method is a continuous, steady-state, clean and simple process, and ideal as an energy-saving method for CO2 recovery. Gas separation using membranes is a pressure-driven process. Due to the low pressure of flue gases, the driving force is too low for membrane processes in post-combustion (low pressure and low CO2 concentration). Membrane processes offer increased separation performances when CO2 concentration in the feed mixture increases.
Membrane separation processes have several advantages over other CO2 separation technologies. The required process equipment is very simple, compact, relatively easy to operate and control, clear process and easy to scale up.
The energy required for the recovery of CO2 by membrane processes depends on the target purity, flue gas composition, and membrane selectivity for CO2. However membrane processes require too much energy for post-combustion CO2 capture; therefore, the low partial pressure of CO2 in the flue gas is a possible disadvantage for the application of membranes. Another disadvantage of membrane process is that the membrane selectivity for the separation of CO2 is very low. Membrane process is not useful for high flow rate applications.
Therefore, the useful membrane for post-combustion CO2 capture should have some specification such as
High selectivity for CO2separation from flue gases,
High thermal and chemical stability,
Resistant to participation,
Resistant to ageing,
Low production cost for different membrane modules.
4.3.1 Hollow Fiber Membrane
Most industrially important membranes for gas separations are hollow fibre ones. Asymmetric hollow fibre membranes (such as polyvinylidene difluoride (PVDF)) with inner skinless structures are favourable for CO2 separation and absorption in the gas-liquid membrane by low mass-transfer resistance and high permeability. In addition, this process can achieve significantly high adsorption efficiencies due to the much larger surface area for gas-liquid interface than conventional gas absorption processes.
4.4 Cryogenic Distillation
The Cryogenic method utilized low temperatures for condensation, separation, and purification of CO2 from flue gases (freezing point of pure CO2 is 195.5 K at atmospheric pressure). Therefore, under the cryogenic separation process, the components can be separated by a series of compression, cooling, and expansion steps. It enables direct production of liquid CO2 that can be stored or sequestered at high pressure via liquid pumping. The advantages of this technology can be summarized as follows:
(1) Liquid CO2 is directly produced, thus making it relatively easy to store or send for enhanced oil recovery.
(2) This technology is relatively straightforward, involving no solvents or other components.
(3) The cryogenic separation can be easy scaled-up to industrial-scale utilization.
The major disadvantages of this process are a large amount of energy required to provide the refrigeration and the CO2 solidification under a low temperature, which causes several operational problems. Therefore, more studies are required for reducing the cost of cryogenic separation A pilot-scale CO2 capture and compression unit (CO2 CCU) that can separate CO2 as liquid phase from the flue gas of oxy-fuel combustion. Their results showed that cryogenic is the most cost effective when the feed gas is available at high pressure. Therefore, cryogenic is not suitable for post-combustion and it is well effective for separation stream with high CO2 concentration such as oxy-fuel combustion.
In a novel CO2 cryogenic liquefaction and separation system, two-stage compression, two-stage refrigeration, two-stage separation, and sufficient recovery of cryogenic energy were adopted. Furthermore, this CO2 cryogenic separation system is more suitable for gas mixtures with high initial pressure and high CO2 concentration
After carbon dioxide (CO2) is captured, the next step is transporting it to a storage site. The current method of transporting CO2 is through a pipeline. Pipelines have been in use for decades, and large volumes of gases, oil and water flow through pipelines every day.
A CO2 pipeline usually begins at the source of capture and travels directly to the storage site — although, in some cases, it might travel as far as it can in the pipe, then transition to a tanker or ship to finish off its journey. It all depends on where the source, pipeline and storage site are located. Both the public and private sector can own pipelines.
Pipelines can transport CO2 in three states: gaseous, liquid and solid. Solid CO2 is commonly known as dry ice, and it’s not cost-effective to transport CO2 as a solid. Pipelines commonly transport carbon dioxide in its gaseous state. A compressor “pushes” the gas through the pipeline. Sometimes a pipeline will have intermittent compressors to keep the gas moving. The CO2 must be clean (free of hydrogen sulfide) and dry. Otherwise, it can corrode a typical pipeline, which is made of carbon manganese steel. As of yet, there are no standards in place for “pipeline quality” carbon dioxide, but experts say that pipelines built from stainless steel would have a lowered risk of corrosion. This, however, may not be economical, since we would have to build brand new pipelines just for CO2.
As CO2 is odourless and colourless, though, adding an odour to the gas could help to detect leaks. Regardless, experts recommend the construction of pipelines in low population areas to minimize any impact. Pipeline costs fluctuate depending on the route of the pipeline (through heavily congested areas, mountains, offshore). It’s also possible to transport carbon dioxide as a liquid, using ships or tanker trucks. Liquid CO2 requires low pressure and a constant low temperature, so cargo tanks need to be both pressurized and refrigerated.
6. CARBON DIOXIDE (CO2) APPLICATIONS
6.1 Multi-Industry Uses for Carbon Dioxide (CO2):
Carbon dioxide in solid and in liquid form is used for refrigeration and cooling. It is used as an inert gas in chemical processes, in the storage of carbon powder and in fire extinguishers.
6.2 Metals Industry:
Carbon dioxide is used in the manufacture of casting moulds to enhance their hardness.
6.3 Oil Industry
Carbon dioxide gas is used in enhanced oil recovery (EOR). EOR is a class of techniques for increasing the quantity of extracted crude oil from oil fields. Carbon dioxide is injected under high pressure into an oil reservoir, which pushes the oil through pipes and up to the surface of the ground. Carbon dioxide gas injection aids oil recovery and reduces the viscosity of recovered oil.
6.4 Manufacturing and Construction Uses:
Carbon dioxide is used on a large scale as a shielding gas in MIG/MAG welding, where the gas protects the weld puddle against oxidation by the surrounding air. A mixture of argon and carbon dioxide is commonly used today to achieve a higher welding rate and reduce the need for post-weld treatment.
Dry ice pellets are used to replace sandblasting when removing paint from surfaces. It aids in reducing the cost of disposal and cleanup.
6.5 Chemicals, Pharmaceuticals and Petroleum Industry Uses:
Large quantities are used as a raw material in the chemical process industry, especially for methanol and urea production.
6.6 Rubber and Plastics Industry Uses:
Flash is removed from rubber objects by tumbling them with crushed dry ice in a rotating drum.
6.7 Food and Beverages Use for Carbon Dioxide:
Liquid or solid carbon dioxide is used for quick freezing, surface freezing, chilling and refrigeration in the transport of foods. In cryogenic tunnel and spiral freezers, high-pressure liquid CO2 is injected through nozzles that convert it to a mixture of CO2 gas and dry ice “snow” that covers the surface of the food product. As it sublimates (goes directly from solid to gas states) refrigeration is transferred to the product.
Carbon dioxide gas is used to carbonated soft drinks, beers and wine and to prevent fungal and bacterial growth.
Liquid carbon dioxide is a good solvent for many organic compounds. It is used to decaffeinate coffee.
It is used as an inert “blanket”, as a product-dispensing propellant and an extraction agent. It can also be used to displace air during canning.
Supercritical CO2 extraction coupled with a fractional separation technique is used by producers of flavours and fragrances to separate and purify volatile flavour and fragrances concentrate.
Cold sterilization can be carried out with a mixture of 90% carbon dioxide and 10% ethylene oxide, the carbon dioxide has a stabilizing effect on the ethylene oxide and reduces the risk of explosion.
6.8 Health Care Uses:
Carbon dioxide is used as an additive to oxygen for medical use as a respiration stimulant.
6.9 Environmental Uses:
Used as a propellant in aerosol cans, it replaces more environmentally troublesome alternatives.
By using dry ice pellets to replace sandblasting when removing paint from surfaces, problems of residue disposal are greatly reduced.
It is used to neutralize alkaline water.
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