US912201A - Smokeless combustion-furnace. - Google Patents

Description

R. STOKER.

SMOKELESS COMBUSTION FURNACE.

APPLICATION FILED APR. 1, 1907.

91 2,201 Patented Feb. 9, 1909.

[l/rrn n ZyG W UNITED STATES PATENT OFFIE.

ROBERT STOKER, OF SALT LAKE CITY, UTAH.

SMOKE LE SS COMBUSTION -FURNACE To all whom "it may concern:

Be it known that I, ROBERT Sroxnn, a citizen of the United States, residing at Salt Lake City, in the county of Salt Lake and State of Utah, have invented certain new and useful Improvements in Smokeless Combustion-Furnaces, of which the following is a specification.

This invention relates to smokeless combustion furnaces, and especially to the class of such furnaoes'having continuous circulation of supenheated air.

The invention embodies improvements in certain features of construction differing essentially from those found in otherfurnaces of this character, and in certain operations resulting from such construction and arrangement of parts, as will be hereinafter fully described and particularly pointed out in the claims.

The object of the invention is to provide in a smokeless combustion furnace having air conduits in or under the floor thereof and containing dampers which are operated to supply air partially to a super-heating air chamber adjacent the fuel chamber and partially to the ash pit of the furnace; and to provide a mixing chamber between the superheating chamber and the combustion chamber of the furnace.

A still further object of the invention is to provide in a smokeless combustion furnace, a series of dividing walls partially separating the furnace into four compartments, one of said walls having a super-heating air chamber therein in communication with the air supply conduits and with an air and gas mixing compartment which is in communication with the fuel chamber; and to rovide novel and peculiar means for control ing said communications.

In the accompanying drawings forming part of this ap lication: Figure l is a central longitudina sectional view of a furnace embodying my invention. Fig. 2 is a sectional view taken on the plane indicated by the dotted line mr, Fig. 1, with the boiler removed. Fig. 3 is a section taken on the plane indicated by the dotted line y Fig. 1. Fig. 4 is a detail section on the line 22, Fig. 1. Fig. 5 is a detail perspective view of the casing for the super-heating chamber.

The same reference numerals denote the same parts throughout the several views of the drawings.

Specification oi Letters Patent.

Application filed April 1, 1907.

Patented Feb. 9, 1909.

Serial No. 365,729.

The boiler 1 is of the ordinary construction and may be arranged in the furnace in any suitable manner, and the grate-bars 2,

separate the fire-box into an ash it and a fuel chamber. The grate-bars inc ine from the front of the chamber 8 to a hollow bridge-wall 4. To the rear of the wall 4, is a wall 5, projecting from the floor 6 of the furnace and having an anchored or concaved top, the deepest portion or center of which is on a horizontal plane with the top of the wall 4. The walls 4 and 5 are spaced apart so as to form an open-top mixing chamber 7, having a bottom or door, 8, operated by a hand lever 9 to open and close the bottom of the chamber 7, for the removal of any deposits in the chamber 7, or on the said door. The Wall 5 forms the front of a combustion chamber 9, and the rear Wall 10 has a contracted passage or throat 11, leading from the combustion chamber 9 into the rear end 12 of the furnace. By this construction the furnace is divided into four sections which communicate with each other over their separating walls.

Under the floor 6 are a pair of air induction conduits 13, leading from the rear of the furnace to the ash pit 1 and the air from such conduits to the ash pit is controlled by a damper 14, located in each conduit and operated by a suitable handle 15. The dampers 14 are hung in the conduits 13 under the bridge-wall and forward of the connection between the conduits 13 and the bridge-wall. These dampers may be manipulated to prevent air from flowing from tne conduits 13 into the ash pit, and when the dampers are r open to a greater or less degree, two branch outlets from the conduits 13 exist, but the effective area of the outlet to the super-h eating chamber 16, is not changed, while the area of the outlet to the ash pit is changed according to the posit-ion of the damper 14.

A super-heating chamber 16 is formed in and by the bridge-Wall 4, and a casing 17, secured to and forming the rear face and bottom of said wall, and provided with slots, perforations or other suitable passages 18 for the passage of super-heated air from the chamber 16 to the mixing chamber 7. Leading from the combustion chamber 9, in each wall of the furnace is a vertical return flue 19, each of which has common with it a longitudinal return fiue 20, in the side walls of the furnace and common with a flue in the front wall of the furnace which has openings 21 thereing it into a fuel-chamber and an ash-pit, a 30 through from the front flue into the fuel chamher 3.

Having thus descrihed my invention What I claim as new and desire to secure by Letters Patent is:

1. In a smoi eless combustion furnace having the usual fire-h OX and grate-h ars separating it into a fuel-chamh er and an ash-pit, a hollow bridge-wall adjacent the firebox and having end-passages and rear openings, a

combustion-chamher having an end spaced from the bridge-Wall and forming therehetween a mixing-cham'i: er, air induction conduits extending from the rear end of the furnace under the combustion chamher and the bridge-wall to the ash-pit and communieating with the mixing-ch am; er through the bridge-Wall by means of the said end passages, the side and-front Wails of the furnace having return lines formed therein and leading from the combustion-chamirer to th Y fuel-chamber, and means for varying the area of the outlet from said channeis to the ash-pit without varying the area of the outlet from these channels to the interior of the bridge-wall.

2. In a smokeless combustion furnace having the usual fire-box and grate-bars separatbridge-wall having air induction passages at the ends thereof and having a superheating chamber therein provided with eduction passages, a comhustion-chamher having an end wall spaced from the rear of the bridge-wall and therel'iy forming a miXin g-chamber comi municating with the superheating chamber through the said eduction passages, air in duction conduits extending from the rear of the furnace under all of said. chambers to the ash-pit and communicating with the superheating chainh er through the said induction passages of the bridge-wall, the side and front walls of the furnace'having return flues formed therein and leading from the comhustion-chamher to the fuel-cha1nber, and dampers operated in said channels under the hridgenvall "for varying the area of the outlet from the channeis to the ash-pit Without varying the area of the outlet from said channeis to the super-heating chamber.

In witness whereof I hereunto set my hand in the presence of two Witnesses.

ROBERT STOKER.

Witnesses:

WINFIELD S. BOOKER, J. B, EnMoNDs.

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