Showing papers by "GE Energy Infrastructure published in 1997"

Advanced reburning methods for high efficiency NOx control

Abstract: The present invention is related to methods and systems for preventing the release of nitrogen oxides with combustion flue gases emitted to the atmosphere. The invention is specifically directed to the removal of nitric oxide, nitrogen dioxide, and nitrous oxide from flue gas in stationary combustion systems. The methods of the invention improve efficiency of conventional reburning and advanced reburning processes by two key improvements, including the injection of a reducing agent into the reburning zone and the use of promoters, which considerably enhance NOx control. The promoters are metal-containing compounds that can be added to the reducing agents. These improvements allow either one or two stages of reducing agent injection for greater NOx control.

Runner for francis-type hydraulic turbine

Abstract: Disclosed is a runner for a Francis-type hydraulic turbine, comprising a ring, a hub, and a number of blades all having a curved shape and being attached to the ring and hub. Each blade has an inlet edge and an outlet edge. The blades are characterized in that, in the direction of turbine rotation, the junction point of each blade inlet edge at the ring is located forwardly of the inlet edge attachment point for that blade at the hub, and the junction point of each blade outlet edge at the hub is located forwardly of the outlet edge attachment point for that blade at the ring.

Method and system for the disposal of coal preparation plant waste coal through slurry co-firing in cyclone-fired boilers to effect a reduction in nitrogen oxide emissions

Abstract: A method and system for the use of waste coal fines to reduce nitrogen oxides emissions from a coal-fired cyclone boiler. A coal water slurry including waste coal fines is injected as a co-firing fuel into a cyclone barrel of the cyclone boiler to partially oxidize the coal water slurry in a central portion of the cyclone barrel where injected. This produces a reducing zone having reducing gas species that convert nitrogen oxides to diatomic nitrogen. The coal water slurry can alternatively be injected into the cyclone barrel from a secondary combustion air conduit. The evaporation of the water from the coal water slurry reduces the overall combustion temperature in the cyclone barrel, further reducing the production of nitrogen oxides.

Using rainwear as switching jackets. A reasonable solution for electric arc exposure

Abstract: LG&E has tested numerous types of clothing for worker protection under electric arc exposure situations and discusses the test methods used along with practical application of the ATPY (arc thermal protective value) and HAF (heat attenuation factor) results which are being reported by manufacturers of flame retardant (FR) clothing. This article focuses on the newly discovered and documented feasibility of using FR rainwear in high fault current switching applications. This article includes data and a comparison of 7 popular rainsuits materials in their performance under electrical arc conditions. Some of these rainsuits have been shown by mannequin testing to withstand arcs up to 30000 Amps 15 cycles without sustained fire or ignition of clothing covered. Using rainwear as switching jackets could allow "double duty" use of rainsuits in plants and on line trucks. Further Neoprene/Nomex(R) and some PYC/Nomex(R)/Kevlar(R) rainsuits have, in testing, proven more protective than woven Nomex(R) "switching jackets" costing substantially more.

IMPROVED ADVANCED REBURNING METHODS FOR HIGH EFFICIENCY NO x? CONTROL

Abstract: The present invention is related to methods and systems for preventing the release of nitrogen oxides with combustion flue gases emitted to the atmosphere. The invention is specifically directed to the removal of nitric oxide, nitrogen dioxide, and nitrous oxide from flue gas in stationary combustion systems. The methods of the invention improve efficiency of conventional reburning and advanced reburning processes by two key improvements, including the injection of a reducing agent into the reburning zone (16) and the use of promoters, which considerably enhance NOx control. The promoters are metal-containing compounds that can be added to the reducing agents. These improvements allow either one or two stages of reducing agent injection for greater NOx control (50).