Sale of fly ash is a flourishing business for many electric utilities. In fact, some 12 million tons of fly ash produced by coal-fired electricity plants in the U.S. are sold to the cement and concrete industries. However, this business may be in danger. Many utilities find that nitrogen oxide (NOx) reduction equipment installed to meet Clean Air Act emissions standards can increase the unburned carbon content of fly ash, making it unmarketable. A new technology, Carbon Burn-Out (CBO), could solve this problem. Designed around fluidized-bed combustion, the process provides temperature, residence time, and oxygen content at values optimized for fly ash carbon combustion. The system's hot restart and cycling capability is similar to that of fluidized-bed steam generators in its ability to quickly recover from a trip condition or short-term forced outage. Not only does CBO produce a high-quality, low-carbon fly ash, but the heat recovered in the process improves the efficiency of the host power plant. Based on successful tests conducted by the Electric Power Research Institute (EPRI) at a pilot plant operated by South Carolina Electric & Gas, the utility has constructed a full-scale facility designed to produce about 160,000 tons of the low-carbon fly ash per year. E-mail email@example.com.
Science fiction author Isaac Asimov may have the best rules for effective brainstorming and creativity. His never-before-published essay, "On Creativity," recently made it to the Web pages of MIT Technology Review.
Much has been made over the potentially dangerous flammability of lithium-ion batteries after major companies like Boeing, Sony, and Tesla have grappled with well-publicized battery fires. Researchers at Stanford University may have come up with a solution to this problem with a smart sensor for lithium-ion batteries that provides a warning if the battery is about to overheat or catch fire.
In this new Design News feature, "How it Works," we’re starting off by examining the inner workings of the electronic cigarette. While e-cigarettes seemed like a gimmick just two or three years ago, they’re catching fire -- so to speak. Sales topped $1 billion last year and are set to hit $10 billion by 2017. Cigarette companies are fighting back by buying up e-cigarette manufacturers.
Advertised as the "Most Powerful Tablet Under $100," the Kindle Fire HD 6 was too tempting for the team at iFixit to pass up. Join us to find out if inexpensive means cheap, irreparable, or just down right economical. It's teardown time!
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.