US1177045A

US1177045A - Means for supplying comminuted fuel to furnaces.

Info

Publication number: US1177045A
Application number: US84368214A
Authority: US
Inventors: John R Magarvey; William Dalton; Charles L Heisler
Original assignee: Individual
Current assignee: Individual
Priority date: 1914-06-08
Filing date: 1914-06-08
Publication date: 1916-03-28
Anticipated expiration: 1933-03-28

Description

J R. MAGARVEY, W. DALTON & C. L. HEISLER. MEANS FOR SUPPLYING COMMINUTED FUEL T0 FURNACES.

APPLICATION HLED JUNE 8,1914. 1,l'??,045. Patented Mar. 28, 1916.

2 SHEETS-SHEET 1- INV EN TORD'.

Patented Mar. 28, 1916.

2 SHEETS-SHEET 2.

NVENT [/Z/ @fififimna 5 M9 M 3m Rn m u F J. R. MAGARVEY, W. DALTON & C. L. HEISLER. MEANS FOR SIUPPLYING COMMINUTED FUEL T0 FURNACES. APPLICATION FILED JUNE 8, 1914.

JOHN R. MAGARVEY, WILLIAM DALTON, AND CHARLES L. HEISLER, 0F SCHENECTAZDY,

NEW YORK.

MEANS FOR SUPPLYING COMMINT ITED FUEL T0 FURNACES.

mamas.

To all whom it may concern:

Be itknown that we, JOHN R. MAGARVEY, WILLIAM DALTON, and CHARLES L. HEISLER, all of Schenectady, in the county of Schenectady and State of New York, have jointly invented a certain new and useful Improvement in Means for Supplying .Comminuted Fuel to Furnaces, of which improvement the following is a specification.

Our invention relates to the storage, pneumatic conveyance, and feeding to one or more furnace chambers, of fuel in a comminuted condition, and its object is to provide means whereby fuel which is comminuted in a centrally located pulverizing apparatus may be conveyed therefrom, and distributed, without waste or escape of dust,

- to a plurality of feeding hoppers located adminuted condition is deliv'ered'from a car,

acent to furnaces in different portions of a large manufacturing plant.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawings: Figure 1 is a View, partly in elevation and partlyin vertical longitudinal central section, of a pulverizing mill designed for the practice of our invention; Fig. 2, a transverse section through the same, on the line a a of Fig. 1; Fig. 3, a View in elevation of a battery of boilers to which our invention is applied; Fig. 4, a vertical section on the line b b of Fig. 3; and, Fig. 5, a plan or top view.

The fuel which is to be burned in a com- 1, running on a railroad track, 2, to a receiving hopper, 3*, located adjacent to one end of a mill building, 3, in which there are installed crushing, pulverizing and storing appliances of substantially the following construction. The fuel drops from the receiving hopper into a crusher,- l, which may be of any suitable and preferred known construction, and which, as it does not, in and of itself, form part of our present invention, is herein only diagrammatically indicated. The fuel, after having been broken, by the crusher, into lumps of comparatively small size, is lifted therefrom and carried to the top of the mill building by an elevator, 5, which deposits it in a 'pair of preliminary storage hoppers, 6, from which it drops, by gravity, into two rotary driers, 7, disposed adjacent to opposite sides of the mill, in which, in order to prevent interruption, there are installed two duplicate sets of dry- Specification of Letters Patent.

are discharged through the Patented Mar. 28, 1916.

Application filed June 8, 1914. Serial No. 843,682.

ing and grinding appliances, the descrip' tion of one of which will apply to both.

A small heating furnace, 8, is located in the mill building, at-a level below that of the drier, and is connected therewith by a fine, 10. After passing through and returning from the drier, the smoke, and any dust that may have collected from the drier rise upward through the flue, 10 and enter the air and fuel cyclone separator, 11, wherein the dust is precipitated, and thence passes, through the conduits, 11 to the fuel pulverizers, 12. The waste gases of combustion stack, 10", which projects above the top of the mill building. The crushedand dried fuel is discharged from the lower ends of the driers, 7, into the crushed fuel storage hoppers, 13, from which it is carried by screw conveyers, 14, to the fuel pulverizers, 12. The latter may be of any suitableand preferred construction, many of which are known in the art,

and are driven by belts, 15, from motors, 16.

An air compressor, 17, adapted to deliver air at a pressure of about 75 pounds per square inch, is connected by pipes, 19, controlled by valves, 20, with the tops of two or more fuel storage and blowing chambers, 18, a plurality of chambers being provided to insure continuous operation, which is attained by making the chambers, 18, of sufiicient volume to enable fuel to be ground and stored in one of them, blown out of the other. are connected with the pulverizer, 12, by conduits, 21, in which are fitted screw conveyers, 22, which .are rotated, through a gear, 21*, in' direction to carry pulverized fuel from the pulverizer to the chambers, 18,

The chambers, 18,

and the discharge ends of the conduits, .within the chambers, 18, are controlled by obvious that additional pairs of fuel blowing chambers may be provided, if desired.

while fuel is being,

Pulverized fuel pneumatic conveying pipes, 24, extend outwardly fro-m the mill, 3, to any desired points in a manufacturing plant, said pipes projecting into the chambers, 18, and terminating, by open lower ends, near the bottoms of said chambers. Sleeves, 25, surround the pipes, 24, within the chambers, and are vertically movable therein by pinions, 25, engaging racks on the sleeves and manually actuated by hand wheels, 25. Annular air passages are formed around the pipes, 24, by the sleeves, 25, and when either sleeve is in its lowest position, as shown in the right hand chamber, 18, in Fig. 1, the flow of pulverized fuel to the open bottom end of the pipe, 24, is cut off, and air admitted from the compressor by opening the valve, 20, controlling the pipe, 19, leading to the chamber, would have free passage into the blowing chamber, through the annular space around the pipe, 24, and thence upwardly into said pipe,

thereby enabling the pipe to be cleaned out.

without disturbing the pulverized fuel in the chamber. By lifting the sleeve, 25, to the position shown in the left hand blowing chamber, 18, and opening the valve, 20, controlling the admission of compressed air to said chamber, pulverized fuel will flow into the open lower end of the pneumatic conveying pipe, 24, thereof, and will be jetted upwardly therein by the air which enters the annular space between said pipe and its surrounding sleeve, 25. The operation will be the same if suction is applied to the outer or delivery end of the pipe, 24, instead of admitting air from the compressor, under which conditions air will flow from the atmosphere into the chamber, past the flap check valve, 26, which is shown open, in dotted lines, in Fig. 1. It will therefore be seen that pulverized fuel may be conveyed through either of the pipes, 24, either by pressure from the air compressor, 17 or by suction or a partial vacuum induced by a fan, 34, which is shown in Figs. 3, 4, and 5, as connected to the delivery end of one of the pipes, 24.

The pneumatic conveying pipes, 24, when extending for a considerable distance from the mill, 3, may, from time to time, become clogged, and for the purpose of relieving them from any accumulation of pulverized fuel, we provide for the admission of air under pressure at different points, and clearing out sections of the pipes, 24, by means of a supplemental clearing pipe, 30, of smaller diameter, which is connected to the compressor, 17, and controlled by a valve, 30. Station by-pass valves, 30", are fitted in connections disposed at intervals along the pipes, 30, and 24, to provide convenient means for admitting air from the former to the latter. Branch pneumatic conveying pipes, 24, may be connected with the pipes,

24, when it is desired to provide additional outlets, the branch pipes being governed by gate valves, 24", and their discharge outlets by gate valves, 24.

The discharge end of one of the pipes, 24, is shown, in Figs. 3, 4, and 5, as connected to a cyclone separating chamber, 31, and the discharge end of another pipe, 24, to the suction fan, 34, before specified. The fan, 34, is also shown as discharging, by the conduit, 33, into the cyclone separating chamber, 31, and'is driven by a motor, 36, which is coupled to a larger fan, 37, and also drives a pair of intermeshing gears, 38, secured on the shafts of a pair of screw con veyers, 40, which rotate in opposite directions in, and distribute pulverized fuel through, horizontal cylindrical feed hoppers, 31", which project, in opposite directions, from the cyclone separating chamber, 31, and communicate with a plurality of feed valves, 41, rotated by a shaft, 41,

which is actuated by the shaft of one of the gears, 38.

The casings of the feed valves, 41, are connected by fuel feed pipes, 42, with low pressure air blast burner pipes, 43, near the discharge ends of the latter in furnaces, 44, forming part of boiler settings, 45, of any of the well known types. burn r pipes is connected with a manifold, 46, o which air is supplied from the fan, 37 ,fthrough conduits, 47. The suction side of -the fan is connected by a conduit, 50, governed by a valve, 50, with the top outlet of the cyclone separating chamber, 31. The fan is also provided with a supplemental suction air inlet, 51, controlled by a valve, 51. Any desired number of separating chambers, 52, of known construction, may be connected with the fan, 37 by conduits, 52, controlled by valves, 52*, thereby preventing any escape of dust from the separating chambers, and discharging it through the conduits, fan, manifolds, and burner pipes into the furnaces. Any of the separating chambers may be connected by a conduit, 53, with a feed box, 54, connected to a furnace, 44*, by a burner pipe, 43, to which air from any available source may be supplied through a conduit, 43".

The detailed construction of the furnaces to which pulverized fuel is supplied by our invention as hereinbefore described, and the burners and other accessories thereof may be of any of the many well known types known in the art, and as they do not form part of our present invention, they are not herein at length set forth.

We claim as our invention and desire to secure by Letters Patent 1. In an apparatus for supplying comminuted fuel to furnaces, the combination of a drier, means to supply fuel thereto, a pulverizer to receive the fuel from the drier,

Each set of blast a dust collector connected to the drier and also to the pulverizer, a fuel storage and blowing chamber to receive the fuel from the pulverizer, a separator, a conduit con-v necting said chamber and separator, means to cause a current of air to flow through said conduit, means to convey the fuel from said separator into a furnace inlet, and means to cause a current of air to flow from said separator into said inlet.

2. In an apparatus for supplying comminuted fuel to furnaces, the combination with means for drying and pulverizing fuel, of a chamber in. which the pulverized fuel is received, means to force air into said chamber, a fuel discharge pipe from said chamber having its inlet end near the bottom thereof, a sleeve surrounding said pipe within said chamber to form an annular air passage from the upper part of said chamber to the inlet end of said pipe, means for moving said sleeve longitudinally of said pipe so as to prevent the fuel from entering the latter while permitting the air to do so, and means to convey the fuel from said pipe into a furnace.

3. In an apparatus for supplying comminuted fuel to furnaces, the combination with a fuel drier-and pulverizer, of a plurality of chambers to receive the fuel therefrom, means to admit air into said chambers and to prevent its escape therefrom into the pulverizer or atmosphere, a fuel discharge pipe leading from each chamber to a furnace, means in each chamber to prevent the fuel from entering said pipe whet so desired while permitting the air to do so, and means to cause an outward flow of air through said pipe.

4. In an apparatus for supplying comminuted fuel to furnaces, the combination with a conduit for the fuel and means to cause a current of air to flow therethrough of a separator into which said conduit leads, a plurality of furnace inlets, a conveyor to receive the fuel from said separator and distribute it to said inlets, a blower connected to said separator and also to said inlets, secondary separators connected to said conduit and also to said blower, and means to prevent the fuel from entering said conduit while maintaining the air current therein.

5. In an apparatus for supplying comminuted fuel to furnaces, the combination of a fuel hopper, an inclined rotary drier to receive the fuel from said hopper, a fuel storage and blowing chamber to receive the fuel from said drier, a'dust separator connected to said drier and also to said chamher, a fuel discharge pipe leading from the lower part of said chamber, means to cause a current of air to flow outwardly through said pipe, means to prevent the fuel in said chamber from entering said pipe when desired while still permitting the air to flow therethrough, a separator into which said pipe leads, a plurality of furnace inlets, a conveyer to receive the fuel from said separator and distribute it to said inlets, and a blower t Withdraw air from said separator and force it into said inlets.

JOHN R. MAGARVEY. WILLIAM DALTON. CHARLES L. HEISLER.

Witnesses:

W. S. FRAME, E. J. APPS.