Katerina Swanson
Fossil fuels, such as coal, natural gas, and oil, are the primary sources of energy for global electricity generation, with coal alone accounting for 41%- 45% of the world's electricity. However, the combustion of coal produces coal combustion residuals (CCR) or coal ash, which is a type of industrial solid waste. CCRs are regulated by organizations like the US Environmental Protection Agency (EPA) and the Texas Commission on Environmental Quality (TCEQ), which have implemented rules for their disposal and management. The CCR Process, or Carbonation-Calcination Reaction, is a promising technology for reducing carbon dioxide emissions from fossil fuel-fired power plants, particularly those using coal.
| Characteristics | Values |
|---|---|
| Full Form | Carbonation-Calcination Reaction |
| Application | Fossil Fuel-fired Power Plants |
| Purpose | Carbon Capture and Storage |
| Emission Reduction | Removes 90% CO2 |
| Energy Penalty | Lower than other processes |
| Electricity Output | Flexible |
| Thermal Energy Efficiency | Sensitive to energy penalty |
| Regulatory Body | EPA |
| Regulation | CCR Rule |
| Registration | Required for some CCR activities |
| Financial Assurance | Required for CCR units with waste left |
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What You'll Learn
CCR refers to Coal Combustion Residuals
The EPA has developed rules and regulations for the disposal and management of CCRs to ensure environmental protection and compliance with federal laws. These regulations cover the disposal of CCRs from both active and inactive facilities, including those that are no longer producing power. The EPA's rules specify that the owners and operators of landfills and surface impoundments that dispose of or manage CCRs are subject to the regulations, even if the CCRs are generated from the combustion of coal at electric utilities or independent power producers.
CCRs can include wastes such as fly ash, bottom ash, boiler slag, and flue gas desulfurization materials. These wastes are generated during the combustion process and can contain a variety of materials, including unburned carbon, ash, and other by-products of coal combustion. The management and disposal of CCRs are important to prevent the release of harmful substances into the environment and to ensure the safe and proper handling of these wastes.
In addition to the environmental concerns surrounding CCRs, there are also economic considerations. The disposal and management of CCRs can incur significant costs, including the cost of registration, amendment, or transfer of CCR units, as well as the cost of providing notice to government authorities and adjacent landowners. Additionally, CCR units that close with CCR waste still in place may require financial assurance to cover maintenance costs during the post-closure period.
The Carbonation-Calcination Reaction (CCR) Process is another term related to fossil fuels. This process aims to reduce carbon dioxide emissions from coal-fired power plants. The CCR Process has been shown to remove 90% of CO2 and provides flexibility in electricity output while minimizing operating and capital costs.
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CCR waste management is regulated by the EPA
CCR, or Coal Combustion Residuals, are wastes generated from the combustion of coal by electric utility power plants. The US Environmental Protection Agency (EPA) has been addressing the wastes from the combustion of coal and other fossil fuels since at least 1988, when it submitted a report on the topic to Congress.
In 2015, the EPA finalized national minimum criteria for the disposal of CCR as a solid waste under Subtitle D of RCRA (the Solid Waste Disposal Act of 1970). The CCR regulations are codified in subpart D of part 257 of title 40 of the CFR (Code of Federal Regulations). The 2015 CCR Rule regulates existing and new CCR landfills and CCR surface impoundments, as well as all lateral expansions of these CCR units. The federal national minimum criteria consist of location restrictions (siting limitations), design and operating criteria, groundwater monitoring and corrective action requirements, and closure and post-closure care requirements.
The CCR Rule specifies that it applies to owners and operators of new and existing landfills and surface impoundments that dispose of or otherwise engage in solid waste management of CCR generated from the combustion of coal at electric utilities and independent power producers. This includes CCR generated at an active facility but sent off-site for management at a facility no longer producing power. All operating or active CCR landfills are subject to the requirements of the rule, whether they are on-site or off-site of the utility, with the sole exception of municipal solid waste landfills.
The EPA has developed a checklist of the technical requirements included in the CCR final rule for states to consult when developing their revised plans. The EPA must determine that the state plan provides enforceable regulatory requirements for the closing or upgrading of CCR disposal facilities that constitute open dumps. If the state requirements for CCR facilities are different from the federal regulations, the EPA will compare them and determine if the alternative requirements are at least as protective of public health and the environment as the federal minimum requirements.
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CCR is a non-hazardous industrial solid waste
CCR stands for Coal Combustion Residuals, which are wastes from the combustion of coal by electric utility power plants. In 1988, the Environmental Protection Agency (EPA) submitted a report to Congress on these wastes, and in 1999, the EPA submitted another report addressing the remaining wastes not covered in the 1988 report.
In 2015, the EPA established national minimum criteria for existing and new CCR landfills and CCR surface impoundments. CCR is classified as a solid waste, which means any garbage, sludge from wastewater treatment plants, or other discarded materials resulting from industrial, commercial, mining, agricultural, or community activities. Solid waste is not limited to physically solid materials and can include liquids, semi-solids, and contained gases.
While CCR is considered a solid waste, it is not classified as a hazardous waste. Hazardous waste is defined as waste with properties that make it potentially dangerous or harmful to human health or the environment. Examples include certain sludges and wastewaters from petroleum refining or pesticide manufacturing, as well as unused commercial chemical products such as industrial chemicals, pesticides, and pharmaceuticals.
The determination of whether something is a waste is called waste identification, and materials may be excluded from the definition of waste if they are recycled in certain ways. In the context of CCR, the EPA has established regulations for the disposal of CCR and the closure of CCR units, with the aim of protecting the environment and human health.
Overall, while CCR is a solid waste and requires proper management and disposal, it is not considered a hazardous waste according to the definitions and regulations outlined by the EPA.
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CCR is used in the Carbonation-Calcination Reaction Process
Carbon Capture and Storage (CCS) technologies are becoming increasingly important as concerns over rising CO2 levels in the atmosphere continue to grow. One such technology is the Carbonation-Calcination Reaction (CCR) Process, which can efficiently capture CO2 and sulphur from coal-fired power plants.
The CCR process involves a series of chemical looping reactions that utilise metal and metal oxide reduction-oxidation properties, or metal oxide and metal carbonate carbonation-calcination properties. The process uses a calcium-based sorbent in a high-temperature reaction to capture CO2 from the flue gas stream of a power plant. This reaction is known as carbonation. The subsequent calcination reaction releases a pure stream of CO2 that can be sequestered, while also regenerating the sorbent.
The Ohio State University has been at the forefront of research into the CCR process, with a 120 KWth subpilot-scale combustion plant established to test it. This facility has achieved greater than 99% CO2 and SO2 capture at a Ca:C mole ratio of 1.6. The CCR process has also been shown to be effective at removing 90% of CO2 over multiple cycles, and it can be used simultaneously to separate carbon dioxide and sulfur dioxide from coal-fired power plant flue gas.
The CCR process offers several advantages over alternative methods of carbon capture. It consumes less steam than amine scrubbing and less oxygen than oxy-combustion, resulting in lower energy penalties. Additionally, the high reactivity of calcium hydroxide minimises the amount of fresh feed and thermal input required, reducing operating costs and reactor size.
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CCR Platforming is a continuous catalyst regeneration process
CCR, or Continuous Catalyst Regeneration, is a process used in catalytic reforming. This process was developed by Universal Oil Products (UOP) and is also known as CCR Platforming.
Catalytic reforming is a process used to produce gasoline, and it involves the use of a catalyst to initiate chemical reactions. The catalyst is usually a combination of platinum and rhenium, which are catalytic sites for the dehydrogenation reactions. The catalyst is regenerated in situ during routine shutdowns, which occur approximately once every 6 to 24 months. The activity of the catalyst can be restored by in-situ high-temperature oxidation of the coke that has built up, followed by chlorination.
In the CCR Platforming process, the reactors are stacked with a moving bed of catalyst trickling from the top reactor to the bottom reactor by gravity. The catalyst is partially deactivated as it moves down the stack and is then continuously withdrawn from the bottom reactor and transferred to a regenerator, where the catalyst is reactivated. The reactivated catalyst is then re-injected into the top reactor, completing the catalyst circulation cycle. This process allows for continuous catalyst regeneration, as opposed to the older semi-regenerative catalytic reforming units, which did not perform in situ catalyst regeneration.
The CCR process has several advantages over other processes. It has been shown to be more energy-efficient, with a lower energy penalty, and provides flexibility in electricity output. The high reactivity of the regenerating compounds also helps to minimize the amount of fresh feed and thermal input required, reducing operating costs.
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Frequently asked questions
CCR stands for Coal Combustion Residuals, which are non-hazardous industrial solid wastes generated from the combustion of coal by electric utilities and independent power producers.
The CCR Process refers to the Carbonation-Calcination Reaction, which has been shown to remove 90% of CO2 at a Calcium:Carbon mol ratio of 1.3 over multiple cycles at the 120 kWth scale from a coal and natural gas co-combustion feedstock.
The CCR Process has a lower energy penalty compared to other processes, provides flexibility in electricity output, and has a high-reactivity of calcium hydroxide, which lowers operating and capital costs.
Carbon capture and storage technologies, such as the CCR Process, are expected to play a pivotal role in achieving the emission reduction targets established by the Paris Agreement.
