Abstract:
A method and apparatus are described for controlling the combustion in a gas turbine. The method includes measuring, with one or two calorimeters, the temperature, calorific value and relative density of a gaseous fuel in order to determine the Wobbe index, comparing the Wobbe index value measured with a predefined Wobbe index value for the gaseous fuel and regulating the temperature of the gaseous fuel with at least one heat exchanger in order to reach the predefined Wobbe index value. The method may also include using a second gaseous fuel, having a different Wobbe index from the gaseous fuel, or a fuel obtained by mixing the gaseous fuel and the second gaseous fuel, according to arbitrary proportions and variable with time.
Abstract:
Provided is a boiler (100) including: a burner (5); a fuel supply unit (10) for supplying fuel to the burner (5); a blowing unit (20) for supplying air to the burner (5); and a control unit (30) for adjusting an amount of fuel to be supplied to the burner (5) and a quantity of air to be supplied to the burner (5), in which the control unit (30) has a reference amount computing portion for calculating a reference fuel amount and a reference air quantity to be supplied to the burner (5) with respect to a required load, an air quantity computing portion that corrects the reference air quantity based on a temperature of the air to be supplied to the burner (5) and a temperature of the fuel to be supplied to the burner (5) and calculates the corrected air quantity as a supply air quantity, and a control portion that controls combustion at the burner based on the reference fuel amount and the supply air quantity.
Abstract:
A gas flowrate control device for turning the flame adjustment wheel of a gas burner is disclosed to include a control wheel, which has an internal gear meshed with the flame adjustment wheel of the gas burner, a big gear surrounding the internal gear, and two small gears respectively formed integral with two sides of the big gear and surrounding the internal gear, and a handle, which has a grip and two arched clamping arms symmetrically extending from the grip and clamped on the control wheel, each arched clamping arm having two toothed arm positions respectively meshed with the two small gears of the control wheel and a crevice defined between the two arm portions for accommodating the big gear.
Abstract:
Intended is to detect the introduction of a new tool properly in the use environment of a flow rate measuring device. In a gas meter (100), an ultrasonic flow meter (104) measures the flow rate of a gas to flow in a passage (102). A new event detecting unit (108) detects the introduction of a new gas tool from the unsteady behaviors of the gas flow rate due to a test run of a new gas tool introduced. A transmit-receive unit (110) transmits a new event signal indicating the introduction of the new gas tool detected by the new event detecting unit (108), to a center device (20) via a network (30). The unsteady state is exemplified by the air purge of the gas tool.
Abstract:
A digital safety device for a gas valve is provided to prevent leakage of gas by detecting the smallest amount of gas and to precisely measure a gas flow rate without influence due to various external factors such as an external temperature, heating power, and so on. A digital safety device for a gas valve includes a gas valve(140), a gas flow rate detection part, a controller, an operation part, and a power supply. The gas valve is connected to the gas flow rate detection part by a nipple(144) and unions(148,150). A packing(146) is disposed between the nipple and the union to prevent gas leakage. The controller has a hole sensor for detecting a position of a magnet(152). The operation part includes a valve gear handle(142) and a motor(130). The valve gear handle has teeth formed at its outer periphery. A gear of the motor is engaged with the teeth.
Abstract:
PROBLEM TO BE SOLVED: To describe a method and apparatus for controlling the combustion in a gas turbine. SOLUTION: The method includes phases measuring, by means of one or two calorimeters, temperature, calorific value and relative density of a gaseous fuel in order to determine the Wobbe index, comparing the measured Wobbe index value with a predefined Wobbe index value for the gaseous fuel and regulating the temperature of the gaseous fuel by means of at least one heat exchanger in order to reach the predefined Wobbe index value. The method may also include a phase using a second gaseous fuel, having a different Wobbe index from the gaseous fuel, or a fuel obtained by mixing the gaseous fuel and the second gaseous fuel, according to arbitrary proportions and variable with time. COPYRIGHT: (C)2009,JPO&INPIT