摘要:
A combined cycle power plant has a plurality of gas turbine units each having a gas turbine and a heat recovery boiler for generating steam from heat from exhaust gas from the gas turbine. The gas turbine of a first one of the gas turbine units is a steam-cooled gas turbine. Steam turbines are driven by steam from the heat recovery boilers. For start-up of the first gas turbine unit, cooling steam generated in a heat recovery boiler different from not being the heat recovery boiler of the first gas turbine unit is fed to the steam-cooled gas turbine to effect cooling thereof during at least part of the start-up operation of the first gas turbine unit.
摘要:
To improve the thermal efficiency when an exhaust heat recovery type combined cycle plant having a gas turbine and a steam turbine in combination is operated at a partial load, the gas turbine exhaust is recirculated and returned to the compressor, and the combustion temperature is prevented from being lowered at the partial load. Preferably, the temperature is maintained constant. In this way, the thermal efficiency during operation at partial load can be improved.
摘要:
To improve the thermal efficiency when an exhaust heat recovery type combined cycle plant having a gas turbine and a steam turbine in combination is operated at a partial load, the gas turbine exhaust is recirculated and returned to the compressor, and the combustion temperature is prevented from being lowered at the partial load. Preferably, the temperature is maintained constant. In this way, the thermal efficiency during operation at partial load can be improved.
摘要:
To improve the thermal efficiency when an exhaust heat recovery type combined cycle plant having a gas turbine and a steam turbine in combination is operated at a partial load, the gas turbine exhaust is recirculated and returned to the compressor, and the combustion temperature is prevented from being lowered at the partial load. Preferably, the temperature is maintained constant. In this way, the thermal efficiency during operation at partial load can be improved.
摘要:
A pressurized fluidized bed combustion combined cycle power plant has a gas turbine unit of single spindle type in which a turbine, driven by combustion gas from burning of coal in a pressurized fluidized bed combustion boiler, drives an electrical generator at constant speed and drives a compressor supplying compressed combustion air to the boiler. To permit partial load operation, a control arrangement is provided to effect, in dependence upon an operating load of the boiler, control of at least one of the flow rate of the combustion air into the boiler, and the operating pressure in the combustion chamber of the boiler. The control arrangement may be, for example, a valve controlling a by-pass flow of the combustion air and/or inlet guide vanes of the compressor.
摘要:
In fuel gasification, particles of, for example, coal and an oxidant are supplied to a reactor, where the coal particles are gasified. The gas thus produced may contain molten slag entrained therein and such slag could subsequently solidify and affect other components of the coal gasification apparatus. Therefore a molten slag cooling heat exchanger is positioned directly above the reactor and this cools the gas so as to cause any molten slag therein to solidify. Hence, such molten slag does not reach an evaporator above the molten slag cooling heat exchanger, so that the efficiency of the evaporator will be maintained. However, solidified molten slag may build up on heat exchange tubes of the molten slag cooling heat exchanger. Therefore, the rate of coolant supplied to the molten slag cooling heat exchanger is varied, to cause expansion and contraction which causes solidified slag to be dislodged. Hence the efficiency of the molten slag cooling heat exchanger does not deteriorate. Cleaning gas and coal particles may be jetted onto the evaporator to dislodge ash or soot therefrom.
摘要:
A dust collecting cell for a dust collector has a plurality of first electrode plates, a plurality of second electrode plates each disposed between the adjoining two of the first electrode plates in a parallel and spaced apart relation thereto, and a block defining a plurality of resistors having a high value of resistance which are connected between the first or second electrode plates and a source of high voltage supply. Even if a dielectric breakdown may occur between any two adjoining electrode plates, the resistors ensure that the discharge take place only as a local phenomenon, and that the cell make only a low noise accompanying the discharge.
摘要:
A combination of a container and a lid is disclosed. The container has an open top and a frusto-conical or cylindrical side wall. The lid is formed with a tongue and provided with an adhesive layer on one side thereof. A release is fixed to the outside of the side wall of the container so that the lid is normally attached releasably thereto.
摘要:
A plurality of jacks are a video signal jack, a left audio signal jack, and a right audio signal jack from left to right. Jack fixing protrusions are formed on a surface of each jack which surface is attached to a circuit board. The jack fixing protrusions are arranged differently among the respective jacks, and can be inserted only into attachment portions of the circuit board corresponding to the respective jacks. Namely, insertion of the respective jacks into incorrect attachment portions is made physically impossible, and erroneous insertion of the jacks can be prevented.
摘要:
A pattern design of a film for manufacturing a printed circuit board is made by using a CAD system, and a plurality of types of Gerber data are produced in which a series of various data has been encoded. For example, a pattern film is formed by combining pattern Gerber data with pattern cut Gerber data. Data for check marks whose sizes are different from each other is added as well as pattern data to each Gerber data such that their central coordinates are to be the same. In this manner, a judgment mark having the check marks combined therewith is formed on the pattern film having the items of Gerber data combined therewith.