Clean Coal Technology

Clean Coal Technology
Name	Clean Coal Technology
Type	Energy technology
Inventor	Various
Introduced	20th century
Developers	United States Department of Energy, Electric Power Research Institute, General Electric, Siemens, Mitsubishi Heavy Industries, Alstom, Hitachi, Babcock & Wilcox, Doosan
Related	Carbon capture and storage, Integrated gasification combined cycle, Flue-gas desulfurization, Selective catalytic reduction

Clean Coal Technology

Clean Coal Technology refers to a suite of engineering methods and industrial systems developed to reduce emissions and improve efficiency of coal-based energy conversion. Originating from research programs in the late 20th century, the field connects advances in combustion engineering, chemical engineering, and materials science with regulatory drivers such as the Clean Air Act and international frameworks including the Kyoto Protocol. Major corporate, national, and multilateral actors have participated in demonstration projects across United States, China, India, Australia, and European Union member states.

Overview and Definition

The term denotes integrated approaches like carbon capture and storage, integrated gasification combined cycle, and emission control systems developed by entities such as the United States Department of Energy, Electric Power Research Institute, European Commission, World Bank, Asian Development Bank, International Energy Agency, and national laboratories like Lawrence Livermore National Laboratory and Oak Ridge National Laboratory. Stakeholders include utilities like Duke Energy, Southern Company, RWE, EDF (Électricité de France), E.ON, and equipment manufacturers General Electric, Siemens, Alstom, Mitsubishi Heavy Industries, and research universities such as Massachusetts Institute of Technology, Imperial College London, Tsinghua University, Indian Institute of Technology, and ETH Zurich. Historical milestones intersect with programs like the Clean Coal Technology Program funded by the United States Department of Energy and bilateral initiatives involving Japan and Australia.

Technologies and Processes

Key processes include pre-combustion, post-combustion, and oxy-fuel methods. Pre-combustion approaches like integrated gasification combined cycle and coal gasification platforms were advanced by firms such as Shell and ConocoPhillips and demonstrated at sites like Sasolburg and projects supported by European Coal and Steel Community frameworks. Post-combustion captures use solvents and sorbents developed through collaborations among BASF, Dow Chemical Company, Johnson Matthey, and academic groups at University of California, Berkeley and University of Cambridge. Oxy-fuel combustion trials involve technology integrators like Doosan Babcock and research centers including Daresbury Laboratory.

Emissions controls employ flue-gas desulfurization systems (wet and dry scrubbers) produced by Babcock & Wilcox and Alstom, and selective catalytic reduction units supplied by Hitachi and Mitsubishi Heavy Industries. Fabric filters and electrostatic precipitators from ABB and Mitsubishi Electric address particulate matter, while mercury control uses activated carbon technologies commercialized by Calgon Carbon and Norit. Advanced materials such as ceramic membranes and high-temperature alloys have been developed with contributions from Carnegie Mellon University, Max Planck Society, and Fraunhofer Society.

Environmental Impacts and Emissions

Technologies aim to reduce sulfur dioxide and nitrogen oxides via scrubbers and catalytic systems employed at plants operated by Xcel Energy and National Grid (United Kingdom). Carbon mitigation strategies like carbon capture and storage involve sequestration in geological formations evaluated by geoscientists at United States Geological Survey and British Geological Survey, and large-scale storage pilots under programs run by European Commission and Global CCS Institute. Lifecycle assessments conducted by Intergovernmental Panel on Climate Change authors and analysts at International Energy Agency examine upstream methane releases from coal mining in basins such as Powder River Basin, Shanxi Basin, and Donetsk Basin.

Co-benefits include reductions in particulate matter and acid rain precursors linked to legislation influenced by cases adjudicated in courts such as Supreme Court of the United States. Residual streams — including coal ash managed under regulations like the Resource Conservation and Recovery Act in the United States — have been studied by environmental agencies like Environmental Protection Agency and nongovernmental bodies such as Greenpeace and Friends of the Earth.

Economic and Policy Considerations

Economic analyses by World Bank, International Monetary Fund, and OECD assess capital intensity, levelized cost of electricity, and deployment incentives including subsidies, tax credits, and emissions trading systems like the European Union Emissions Trading System. National policy instruments influencing adoption include standards promulgated by the Environmental Protection Agency, funding programs such as those from the Department of Energy and Japan Bank for International Cooperation, and bilateral cooperation agreements between United States and China. Utilities and investors, including BlackRock and ExxonMobil, evaluate stranded asset risk, while multinationals like General Electric and Siemens structure project finance with export credit agencies such as Export-Import Bank of the United States.

Implementation and Global Adoption

Large demonstration projects have been executed by consortia involving Southern Company at the Plant Barry scale, the Boundary Dam Power Station retrofits in Canada supported by SaskPower, and pilot plants in China with participants such as China Huaneng Group and China National Coal Group. Deployment trajectories vary: rapid expansion in China and pilot-scale efforts in India led by NTPC Limited contrast with moratoria or phased retirement schedules in parts of Europe where companies like RWE and E.ON shift portfolios towards renewable energy developers including Ørsted and Vestas. International financing mechanisms from Asian Development Bank and International Finance Corporation have underwritten some projects, while research partnerships among EU Horizon 2020 participants and US National Renewable Energy Laboratory support technology maturation.

Controversies and Criticisms

Critics from organizations such as Greenpeace, Sierra Club, and academics at Stanford University and University of Oxford argue that dependencies on coal infrastructure perpetuate greenhouse gas emissions and divert investment from renewables advocated by proponents at Rocky Mountain Institute and Bloomberg New Energy Finance. Legal challenges have arisen under regulatory bodies including Environmental Protection Agency rulemakings and cases before the European Court of Justice. Debates focus on cost overruns at projects financed by entities like Bechtel and Fluor Corporation, uncertain long-term liability for sequestration monitored by agencies such as United States Environmental Protection Agency, and the ethics of financing by institutions like World Bank and private banks criticized in reports by Amnesty International.

Category:Energy technology