Conveyors: fluid current – Fluid current conveyor outlet means – With material separating receptacle
Reexamination Certificate
1999-04-15
2001-05-15
Olszewski, Robert P. (Department: 2167)
Conveyors: fluid current
Fluid current conveyor outlet means
With material separating receptacle
C406S174000, C406S168000
Reexamination Certificate
active
06231273
ABSTRACT:
The invention relates to a separator disposed between a mill or grinder and a boiler so as to select, on the basis of size, particles produced by grinding a fuel in the grinder and conveyed by a flow of air from the grinder to the separator, and then to the boiler, which separator extends in an axial direction and includes output compartments, each of which underlies a respective conveyor duct connecting the separator to the boiler.
BACKGROUND OF THE INVENTION
Such a separator is used in particular for separating coal particles and for feeding the boiler with particles whose size is smaller than a reference size. The particles whose size exceeds the reference size are recycled to the grinder to be ground again with the coal feedstock.
The particles are conveyed from the grinder to the separator and then to the boiler by a flow air channelled by conveyor ducts. It is known that the hearth of the boiler can be fed via a plurality of ducts. For this reason, the separator commonly includes output compartments, each of which underlies a respective conveyor duct connecting the separator to the boiler.
In existing grinding installations, provision is made to isolate the boiler from the separator by disposing isolating gates on all of the pipes, preferably at the outlets from the separator. In known manner, each gate operates with an air barrier at a pressure that is higher than the pressure upstream and downstream from the gate in the duct in which it is mounted, so that it closes with complete airtightness.
The conveyor ducts connecting the separator to the boiler are closed during certain operations.
However, the use of one isolating gate for each conveyor duct is costly compared with the grinding installation as a whole. The proportionally high cost of isolating the ducts results from the unit cost of a gate, which includes implementing sealing by means of an air barrier, and from the number of gates per grinding installation.
OBJECTS AND SUMMARY OF THE INVENTION
An object of the invention is to reduce the cost of isolating conveyor ducts that connect a fuel particle separator to a boiler in a grinding installation.
The basic idea of the invention is to reduce the number of gates.
To this end, the invention provides a separator disposed between a grinder and a boiler so as to select, on the basis of size, particles produced by grinding a fuel in the grinder and conveyed by a flow of air from the grinder to the separator, and then to the boiler, which separator extends in an axial direction and includes output compartments, each of which underlies a respective conveyor duct connecting the separator to the boiler, wherein an isolating valve member is mounted to move inside the separator, and is moved in translation in the axial direction either to allow the flow to pass through all of the output compartments into the conveyor ducts or else to prevent said flow from passing therethrough.
The isolating valve member makes it possible for the conveyor ducts mounted on the output compartments of the separator to be closed together. In this way, the number of isolating valve members is reduced to the number of separators in the grinding installation, regardless of the number of conveyor ducts from each separator.
Preferably, the isolating valve member is secured to a valve member tube which communicates with a pressurized enclosure disposed outside the separator.
In a first advantage of the invention, the isolating valve member has two conical blades spaced apart by spacers and secured to the valve member tube which is provided with openings disposed between the two spaced-apart blades to enable barrier air to pass through and thus to put the valve member under higher pressure than the output compartments, thereby guaranteeing complete airtightness between the ducts and the separator.
In a second advantage of the invention, the isolating valve member has two conical blades spaced apart by spacers and secured to the valve member tube which is provided with openings at the base of one of the two blades to enable barrier air to pass through and thus to put the isolating valve member under higher pressure than two adjacent output compartments, thereby guaranteeing complete airtightness between the two corresponding ducts.
REFERENCES:
patent: 1125032 (1915-01-01), Goodell
patent: 2112359 (1938-03-01), Crites
patent: 2992858 (1961-07-01), Pendleton
patent: 3776600 (1973-12-01), McLeod, Jr.
patent: 4200415 (1980-04-01), Boring
patent: 4473326 (1984-09-01), Oetiker
patent: 5181457 (1993-01-01), Toshiyuki
patent: 5562366 (1996-10-01), Paulson
patent: 5845782 (1998-12-01), Depew
patent: 0 282 722 A2 (1988-09-01), None
patent: 0 372 402 A1 (1990-06-01), None
Alstom France SA
Olszewski Robert P.
Ridley Richard
Sughrue Mion Zinn Macpeak & Seas, PLLC
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