US1515846A

US1515846A - Furnace

Info

Publication number: US1515846A
Application number: US444018A
Authority: US
Inventors: William M Duncan
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-02-10
Filing date: 1921-02-10
Publication date: 1924-11-18
Anticipated expiration: 1941-11-18

Description

W. M. DUNCAN ml. 1 WM FURNACE Filed Feb. 10 1921 2 Shams-Sheet 1 WILLIAM M. DUNCAN, OF ALTON, ILLINOIS.

FURNACE.

Applicationfiled February 10, .1921. Serial No. 444,018.

To all whom it may concern: 7

Be it known that I, WILLIAM M. DUNCAN, a citizen of the United States of America, and a resident of Alton, in the county of Madison, State of Illinois, have invented certain new and useful Improvements in Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification. H

This invention relates to improvements in furnaces, and more particularly to a furnace provided with draft boxes surrounded by a each draft box is open at the top for the discharge of draft through the fuel supporting portion of the grate, and this allows the ashesttogether with fine particles of fuel to drop into the draft box. As a means for removing the ashes from the draft box, I have shown a conveyor whereby ashes are transmitted from the bottom of the draft box and through an ash out-let at one end .of the box. This ash conveyor is preferably in the form of a rotary screw arranged longitudinally of the draft box at thebottom thereof and extending into the ash outlet.

A further object of the invention is to prevent leakage of draft through the ash outlet, and this is preferably accomplished by forming an ash sealin said outlet, the ashes being pushed into the outlet so as to close the same at a point beyond the ash conveyor.

Another object is to provide an ash discharge device adapted to'be carried by a portable mechanical stoker, and having detachable elements allowing the portable stoker to be moved into and out of the furnace.

Fig. I is a longitudinal section, illustrating a mechanical stoker embodying the features of this invention, the middle portion of the apparatus being broken away.

Fig. II is a transverse section of the apparatus shown in Fig. I.

To illustrate the invention, I have shown a mechanical stoker comprising an: endless chain grate A supported between side frame members 1 mounted on wheels 2. The chain grate comprises many grate links 3 connected by means of pivot rods 4.- arranged transversely of the grate. A power shaft 5 (Fig.

I), supported by the side frames 1, is provided with any desired number of sprocket wheels 6 for transmitting movement to the endless chain grate. The chain grate passes around the sprocket wheels 6 and also around a plain idle wheel, or roll 7, the latter being mounted on a shaft 8. The fuel passes from a hopper 9 to the top face of the grate, as indicated by arrows in Fig. I.

The furnace is provided with suitable side walls B and B, including refractory members 10 located adjacent to the side margins of the grate. The lower portion of the side wall B is hollow, as shown in Fig. II, to provide an inlet passageway 11 for the draft. 12 designates draft boxes surrounded by the traveling grate and extending from a side frame 1 at one side of the grate to the frame 1 at the other side. All of these boxes are open at the top to provide for the delivery of the draft to the grate.

One end of each draft box is provided. with an intake nipple 13 forthe admission of draftand the opposite end. is provided with a nipple 14 for the discharge of ashes. Since the grate is supported by a portable frame, including the side frame members 1 adapted to be moved into and out of the fur nace, the nipples 13 and 14 are detachable, each nipple being tele scoped with one of the side frame members 1 and also with one of the furnace walls.

The ash passageway 15 is formed in the lower portion of the furnace wall B so as to communicate with all of the nipples 14, and a rotary screw conveyor 16 is located in the bottom of this passageway.

, Each draft box 12 contains an ash couveyor 17 'whereby ashes are transmitted along the bottom of the draft box and pushed into its ash outlet nipple lt, said conveyor 17 being in the form of a rotary screw arranged longitudinally of the draft box at the bottom thereof and extending into the outlet nipple 14;. The screw conveyor 17 terminates in the outlet nipple, and the external diameter of the screw is approximately equal to the internal diameter of the nipple.

One end of each screw conveyor 17 is rotatably mounted in a bearing 18 extending from one of the side frame members 1, and the same end is provided with a socket 19. A rotary operating shaft 20, extending through the furnace wall B, is enserted into the socket l9, and this operating shaft can be withdrawn from the socket to permit removal of the grate-supporting frame which is supported by the WhBGlS'Q.

The screw conveyors 17 are rotated at suitable intervals for the purpose of removing the ashes which accumulate in the draft boxes, the ashes being pushed into the outlet nipples 14 where they accumulate beyond the ends ofthe'screw conveyors 1.7 to form seals which prevent the escape of draft through-the ash outlets; All of the nipples 14L communicate with the ash passageway 15, but the ash seals in the nipples let prevent the-escape; of draft from one draft box to another;

Thescrew conveyor 16 is operated at intervals to're-n'iove ashes from. theash passagew-ay-lfi;

I claim:

1. A furnace provided with an endless traveling grate, a draft box surrounded by said grate,.said draft box being open at the top for the'discharge of draft through the fuel-supporting portion of the grate, said draft'box also having an ash outlet at one of itsends,.and a conveyor whereby ashes are transmitted along the. bottom of said draft box and pushed into said ash outlet, so as to form a seal in said outlet, said conveyor comprising a rotary screw arranged longitudinally of said draft box at the bottom thereof and terminating in said ash outlet.

2. A furnace provided with an endless traveling grate, a draft box surrounded by said grate, said draft box being open at the top for the discharge'of draft through the fue'l supportingportion of the grate, said draft: box also having an-ash outlet at one of its endsfand a conveyor whereby ashes are transmitted alongthe bottom of said draft box and pushed into said ash outlet, soas to form a seal in said outlet, said con veyor comprising a rotary screw arranged longitudinally. of said draft box at the bottom thereof and terminating .in said ash outlet, said ash outlet being cylindrical and approximately equal in diameter to the rotary screw.

3. Afurnace provided with an endless traveling grate, a draft box surroundedby 7 said 'grate,said :draft box being open at the top for thedischarge'ofdraft through the.

fuel-supporting portion of the grate, said draft box also having an ash outlet at one of its ends, and a conveyor whereby ashes are transmitted along. the bottom of said draft box and pushed into said ash outlet, so asto form a seal in said outlet, said conveyor comprising a rotary screw arranged longitudinally of said draft box at the bottom thereof and terminating in said ash outlet, the furnace being provided with an ash passageway communicatingwith said ash outlet, and means for forcing ashes through said ash passageway.

at. A furnace provided with side walls; an endless traveling grate supported between said side walls, draft boxes surrounded by said endless grate, each of said draft boxes beingopen at the top for the discharge of draft through the fuel supporting portion of the grate, one-of said side walls having a draft passageway and the other side wall being provided with an ash passageway, one end of each draft box having a draft inlet communicating with said draft passageway and the other end having an ash outlet leading to said ash passageway, and conveyors whereby ashes are transmitted from the bottoms of the draft boxes and into the-ash outlets, so as to form ash seals in said ash outlets. v

5. A furnace provided with side walls, an endless traveling grate supported between said side walls, draft boxes surrounded by said endless'grate, each of said draft boxes being open at the top for the discharge of draft through the fuel supporting portion of the. grate, one of said side walls having a draft passageway and the other side wall being provided with'an ash passageway, one end of each draft box having a draft inlet communicating with said draft passageway and the other end having an ash outlet leading to said ash passageway, and conveyors whereby ashes are transmitted from the bottomsof theTdraft-boxes and into the ash outlets,so as to form ash seals in said ash butlets, said conveyors comprising rotary screws each arranged longitudinally of one of the draft boxes at the'bottom thereof and terminating at the'ash outlet.

In testimony that I clainrthe foregoing I hereunto aflix my signature. I

ILLI-AM M. DUNCAN.