Fluidized-bed equipment and pressurized fluidized-bed (combustion) combined cycle apparatus

A system for determining bed height in a fluidized-bed equipment comprising:

• a vessel having a first region high in concentration of a granular or liquid substance and a second region low in said concentration, means for measuring a physical property within said vessel, means for selecting, an interior of said vessel, two upper and lower optional regions and producing two expressions for fitting expressing physical property distributions in the respective regions, as a single exponential function, from physical property measuring values of the respective regions, to find an intersection between the two expressions, repeating producing of the two expressions and finding of an intersection in different selected regions, and determining a bed height corresponding to an intersection in which a correlation between a measuring value and the expressions for fitting is the best, and display means for displaying the physical property distributions produced from the two expressions for fitting in the selected combination.

A system for determining bed height in a pressurized fluidized-bed equipment comprising:

• a pressure vessel filled with fluidized particles, means for supplying coal particles into said vessel, means for supplying a gasification agent of the coal particles, means for exhausting gas of formation generated by gasification of said coal out of said vessel, and surface detecting means for measuring physical properties at a plurality of points within said vessel in a height direction thereof, to find the expressions for fitting of physical property distribution curves of two selected optionally divided upper and lower regions of said vessel, repeating finding of the expressions for fitting with different selected regions to detect a bed height of the fluidized particles corresponding to an intersection of two expressions for fitting in which a correlation between physical property measuring values and the expression for fitting is the best.

A system for regulating a fluidized-bed boiler comprising:

• a vessel into which a fluidized particle is put, means supplying coal particles into said vessel, means for supplying a gasification agent of said coal particles, means for exhausting combustion gas produced by gasification of the coal particles, from said vessel, heat-exchanging means arranged within said vessel for being heated by heat of combustion of the coal particles to produce steam from water, means for measuring physical properties at a plurality of points within said vessel in a height direction thereof, means for selecting an interior of said vessel, two optional upper and lower regions to find physical property distribution curves of the respective selected regions from said physical property measuring results to display the physical property distribution curves, and means for regulating at least one of fuel supply quantity, gasification agent supply quantity, and quantity of water supplied to said heat exchanging means, on the basis of an intersection of two produced physical property distribution curves.

A system for regulating a pressurized fluidized-bed combined cycle apparatus comprising:

• a pressure vessel provided with a heat exchanger filled with fluidized particles for producing steam from water, a gas turbine driven by power which is gas generated by supply of coal particles and a gasification agent of the coal particles to said vessel, a steam turbine driven by steam produced by said heat exchanger, one generator for generating electric power by the power of said gas turbine, another generator for generating electric power by the power of said steam turbine, means for measuring physical properties at a plurality of points within said vessel in a height direction thereof, to find an intersection of respective physical property distributions of the selected optionally divided upper and lower regions, and means for regulating at least one parameter selected from the group consisting of a quantity of coal particles supplied into said vessel on the basis of the produced intersection, a flow rate of the gasification agent and a quantity of water supplied to said heat exchanger.