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However, they also noted, high PTW efficiencies and the moderate fuel economies of current compressed natural gas vehicles (CNGVs) make them a viable option as well. If CNG were to be eventually used in hybrids, the advantage of the electric generation/EV option shrinks. Their open access paper is published in the journal Energy.
Researchers from SRI International (SRI) are developing a methane-and-coal-to-liquids process that consumes negligible amounts of water and does not generate carbon dioxide. If biogas is substituted for conventional natural gas, total GHG emissions can further significantly reduced (190 gCO 2 /mile). Lifecycle GHG comparison.
In addition to its regional and temporal scope, this study is distinct from earlier LCA literature in four key aspects: This study considers the lifetime average carbon intensity of the fuel and electricity mixes, including biofuels and biogas.
Overview of the bluegas catalytic coal methanation process. The projects would be developed using GreatPoint’s proprietary bluegas technology, which utilizes catalytic hydromethanation to create pure hydrogen and substitute natural gas (SNG) that is pipeline-ready in a single-stage gasification process. Click to enlarge.
Comparison of coal consumption and CO 2 emissions for co-production and separate production of liquids and power. Conventional CTL plant gasifies coal to produce a syngas which is then converted in a Fischer-Tropsch reactor to products. The liquids output capacity of CTL plants is 50,000 barrels/day. Click to enlarge.
Genscape reported that January 2013 coal-fired power generation in the US surged 8.9% This increase to 140,080 GWH resulted from higher demand for electricity, higher gas prices, and lower levels of generation from nuclear plants and renewable technologies. Coal and gas had equal power sector output levels in April of last year.
In regions where the share of coal-based electricity is relatively low, EVs can achieve substantial GHG reduction, the team reports in a paper in the ACS journal Environmental Science & Technology. According to the 12 th Five-Year Plan of the China Coal Industry (2011?2015)
Technology warming potential (TWP) for three sets of natural gas fuel-switching scenarios. (A) A) CNG light-duty cars vs. gasoline cars; (B) CNG heavy-duty vehicles vs. diesel vehicles; and (C) combined-cycle natural gas plants vs. supercritical coal plants using low-CH 4 coal. Source: Alvarez et al. Click to enlarge.
Australia-based underground coal gasification (UCG) company Linc Energy ( earlier post ) has signed an exclusive agreement with the UK-based alkaline fuel cell technology company AFC Energy Plc and its related company, B9 Coal ( earlier post ). A downside of AFCs has been CO 2 contamination of the electrolyte, reducing efficiency.
All large-scale energy systems have environmental impacts, and the ability to compare the impacts of renewable energy sources is an important step in planning a future without coal or gas power. Wind beats coal by any environmental measure, but that doesn’t mean that its impacts are negligible. Source: Miller and Keith (2018a).
Electra has raised $85 million to produce Low-Temperature Iron (LTI) from commercial and low-grade ores using zero-carbon intermittent electricity. By comparison, 69% of steel today is made at approximately 1,600 degrees Celsius (2,912 degrees Fahrenheit) using coal, emitting about two tons of carbon dioxide for every ton of steel produced.
The US Department of Energy’s National Energy Technology Laboratory (NETL) has issued a new Funding Opportunity Announcement (FOA) soliciting research projects that will address key challenges related to the utilization of coal-biomass mixtures for co-production of power and hydrogen, fuels, and/or chemicals.
An analysis of near-term spending plans on renewables by the biggest oil and gas companies shows that real investments in renewable energy will continue to pale in comparison to capex plans for greenfield fossil fuel projects. Good case in point: Italian multinational oil and gas giant Eni S.p.A. 2 Total SA. 3 ENI SpA.
Rice University researchers have determined a more effective way to use natural gas to reduce climate-warming emissions would be in the replacement of existing coal-fired power plants and fuel-oil furnaces rather than burning it in cars and buses.
This material will be used in the steelmaking process to offset other high-quality metallics that come with higher greenhouse gas emissions. The process developed by Electra produces Low-Temperature Iron (LTI) from commercial and low-grade ores using zero-carbon intermittent electricity.
Researchers at the Norwegian University of Science and Technology (NTNU) have compared the emissions resulting from the production, use, and end-of-life of electric and internal combustion engine vehicles (EVs and ICEVs) in a full life-cycle analysis (LCA). This has led to a general perception of EVs as an environmentally benign technology.
The study found that TCO for electric and diesel medium-duty urban delivery trucks were similar. The electric truck is relatively more cost-effective on the NYCC and when VKT demand is higher. Cost-competitiveness of the electric truck diminishes in drive cycles with higher average speeds. Credit: ACS, Lee et al.
WTW energy demand and GHG emissions for EV and PHEV drivetrains for various electricity sources; gasoline ICE vehicle is solid square, hybrid the hollow square. First, it considers the performance of both mature and novel hydrogen production processes, multiple electricity generation pathways and several alternative drivetrains.
(MHI) has achieved a turbine inlet temperature of 1,600 °C—which it calls the world’s highest—with the company’s advanced J-Series gas turbine. The gas turbine that marked the achievement is the 60 hertz (Hz) M501J, which MHI developed in the spring of 2009. 2 Power Station of Kansai Electric Power Co.,
Results of a lifecycle analysis by a team at the University of Michigan suggest that multiple types of natural gas-powered vehicles—i.e., Results of a lifecycle analysis by a team at the University of Michigan suggest that multiple types of natural gas-powered vehicles—i.e., —Dai and Lastoskie.
The goal of the agreement is to reduce the greenhouse gas (GHG) emissions in the ocean transportation of sustainable wood pellets. In December 2020, MOL reached a coal transport deal with Tohoku Electric Power Co., using a coal carrier equipped with a hard sail wind power propulsion system.
Analysts at the US Department of Energy’s (DOE) National Renewable Energy Laboratory (NREL) have developed harmonized meta-analyses of lifecycle greenhouse-gas emissions from coal, wind, solar and other energy technologies. Also helping with the findings were subcontractors and researchers from the DOE’s Brookhaven National Laboratory.
This year has brought a significant shift in the generating cost comparison between renewable energy and fossil fuels, according to detailed analysis by technology and region, published this week by Bloomberg New Energy Finance.
Hydrogen for reverse water gas shift reaction to avoid producing CO 2 during the process is produced by electrolyzing water, driven by solar power. For comparison, they also modeled the production of methanol using only biomass as a fuel and also using coal as source of both carbon and energy. Hertwich and Zhang (2009).
The fact that German electricity prices are among the highest in Europe, despite relatively low wholesale prices, must serve as a warning signal ,” said IEA Executive Director Maria van der Hoeven as she presented the report, Energy Policies of IEA Countries – Germany 2013 Review. Electricity prices in comparison.
The study, published in the journal Environmental Research Letters , concluded that even under highly optimistic assumptions the compressed-air car is significantly less efficient than a battery electric vehicle and produces more greenhouse gas emissions than a conventional gas-powered car with a coal intensive power mix.
Energy use by households (the burning of wood, gas, coal etc) is the most important source of PM 2.5 Power plants producing heat and electricity have reduced emissions significantly since 1990 by improving abatement equipment, switching to cleaner fuels and through improved energy efficiency.
On 22 January 2016, Siemens handed over the combined cycle power plant equipped with a Siemens H-class gas turbine at the Lausward location in the Düsseldorf (Germany) harbor area to the customer and operator, the utility company Stadtwerke Düsseldorf AG. The turnkey plant sets three new records in world-wide comparison.
CO 2 emissions of the C 180 in comparison to its predecessor [t/car]. Where energy resources are concerned, lignite, hard coal and uranium figure principally in car production. Natural gas and crude oil are strongly influenced by fuel consumption during the use phase. Source: Mercedes-Benz. Click to enlarge. l/100 km (36.8
The selected projects focus on advancing the development of a suite of post-combustion CO 2 capture and supersonic compression systems for new and existing coal-based electric generating plants, specifically: (1) supersonic compression systems; (2) small pilot-scale (from 0.5 FuelCell Energy Inc. Click to enlarge.
A paper by a team from the University of Chicago and MIT suggests that technology-driven cost reductions in fossil fuels will lead to the continued use of fossil fuels—oil, gas, and coal—unless governments pass new taxes on carbon emissions. for oil, 24% for coal, and 20% for natural gas.
Among their findings in the study are that subjective choices such as coproduct usage and allocation methodology can be more important sources of variability in the life cycle greenhouse gas (LC-GHG) inventory of a fuel option than the process and energy use of fuel production. Variability in lifecycle analysis (LCA), Stratton et al.
Methane, the main component of natural gas, is released from leaking pipelines, coal mines, oil wells, cattle, rice paddies and landfills. And all wood- and biomass-burning stoves were replaced with cleaner, modern stoves that use electricity or natural gas for energy. degree reduction found in earlier studies.
life-cycle study of three Li-ion battery chemistries for plug-in hybrid (PHEV) and battery-electric (BEV) vehicles generated a number of findings and identified opportunities for improving the environmental profile of Li-ion batteries for use in plug-in and electric vehicles. A recent Abt Associates, Inc.
The key requirement, of course, is that the electricity used to convert the CO 2. must be renewable, or at least from a carbon-neutral source such as nuclear; otherwise, more CO 2 would be emitted in producing the electricity than would be reduced in the process. —Whipple and Kenis.
However, 70% of vehicles can apparently be fueled with no increase of electrical capacity. The reduction in emissions results from electric operation being much more efficient than gasoline operation. BEVs and PHEVs running on electricity have zero tailpipe emissions, but there are still mining and power plant emissions.
Soft wood, such as spruce or pine, packs less than 10 megajoules per liter, whereas bituminous coal has 2.5 By comparison, gasoline has 34 MJ/L and diesel about 38 MJ/L. By this metric, air-dried wood contains about 3,500 Wh/L, good steam coal around 6,500, gasoline 9,600, aviation kerosene 10,300, and natural gas (methane) merely 9.7—less
However, although the state has made considerable progress decoupling economic growth from greenhouse gas (GHG) emissions, the rate of emissions decline appears to be slowing, due in part to a spike in transportation emissions attributed to an increase from light-duty vehicles. California’s electric-power sector was responsible for 19.1%
This synthesis consumes only CO 2 and electricity, and is constrained only by the cost of electricity. Molten carbonate electrosynthesized boron-doped CNTs exhibit high electrical conductivity. Per ton CO 2 avoided, the C2CNT cement plant consumes $50 electricity, emits no CO 2 , and produces $100 cement and ∼$60,000 of CNTs.
The American Lung Association oversees the Clean Air Choice program throughout the United States promoting alternative renewable fuels such as biodiesel and E85, partnering with fleets to replace legacy diesel engines, and by supporting the clean-air advantages of electric and hybrid vehicles. —Harold P. Upstream GHG emissions.
NREL research confirms that after being used to power a car, a Li-ion battery retains approximately 70% of its initial capacity—making its reuse a valuable energy storage option for electric utilities, before battery materials are recycled. —“Identifying and Overcoming Critical Barriers to Widespread Second Use of PEV Batteries”.
MFCs are an attractive candidate for treating the soluble (liquid) portion of stillage because they operate optimally at diffused wastewater ranges, thus precluding the need for costly dewatering or concentration steps, and produce small amounts of electricity, thus creating an energy-efficient combined process.
The same highly electrified scenarios, however, could not satisfy 80% GHG-reduction targets, even assuming 80% decarbonized electricity and no growth in travel demand. Within the transportation sector, the two basic options for reducing petroleum use and greenhouse gas (GHG) emissions are fuel-use reduction and fuel substitution.
Nearly all of the world’s ship fleet still runs on diesel fuel, with about a quarter of new ships on order being built to run on somewhat lower-carbon alternatives like liquefied natural gas, methanol, or hybrid propulsion. Shipping uses over 300 million tonnes of fossil fuels every year, producing 3 percent of greenhouse gas emissions.
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