US1778744A

US1778744A - Method for burning different fuels

Info

Publication number: US1778744A
Application number: US53992A
Authority: US
Inventors: Arthur V Adamson
Original assignee: Int Comb Eng Corp
Current assignee: International Combustion Engineering Corp
Priority date: 1925-09-02
Filing date: 1925-09-02
Publication date: 1930-10-21
Anticipated expiration: 1947-10-21

Description

Oct. 21, 1930.

A. V. ADAMSON METHOD FOR BURNING DIFFERENT FUELS Filed Sept. 2 925 Patented Oct. 21, 1930 UNITED STATES P TENT OFFICE j ARTHUR v. ADAMSON, OF HEMrsTEAn, NEW YORK, ssIGNoE To INTERNATIONAL COMBUSTION ENGINEERING ooEPoRATIoN, A CORPORATION OF DELAWARE METHOD ron BURNING DIFFERENT EUELs Application filed September This invention relates to furnaces, particularly boiler furnaces, for burning different fuels, such as pulverized coal, saw-dust and hog fuel, that is, waste combustible material of wood-working plants and the like.

One of the primary objects of the invention is to provide a furnace in which such fuels can be effectively burned, either together or alternately.

How the foregoing, together with such other objects as may hereinafter appear, or are incident to my invention, are realized, is illustrated in preferred form in the accompanying drawings, wherein Fig. 1 is'a vertical section thru a furnace and boiler embodying my improvements, and

Fig. 2 is a fragmentary section illustrating the arrangement of burners.

Referring now to Fig. '1, the combustion chamber A is approximately rectangular in cross section and has considerable vertical height. The combustion chamber is set in front of the boiler B and has an ash-pit 7. The side and front walls of the furance are hollow, the space being divided into horizontally extending channels 8 having air intake openings 9 at the rear and inlets 10 into the furnace in the front wall. The fuel is introduced thru the arch 11 by means of pulverized coal burners 12 and other burners 13 arranged in alternation therewith for sup plying the saw-dust or other fuel, the said burners l2 and 13 communicating with conduits 12 and 13', respectively, which are extended to suitable bins or sources (not shown) of coal and saw-dust.

Located above the ash-pit 7 is a water screen 14 composed of spaced tubes connected into the headers 15 and 16. Downcomers 17 connect the header 15 with the water space of the boiler and upcomers 18 connect the header 16 with the upper portion of the boiler to provide for circulation thru the water screen. The spacing of the tubes of the water screen is such as to permit gravitating refuse to freely pass therebetween to the ash-pit.

Immediately above the Water screen are arranged a plurality of air inlets 19 thru which air is supplied under pressure as by 2, 1925. Serial No. 53,992,

a fan 20. Beneath the water screen 14 are

other inlets

21 and 22, which may or may not be used as the case may demand. The lower of the inlets 22 also serve as cleanout openings.

Normally the boiler is fed by pulverized below the slagging point in passing thru the cool zone created by the screen 14. Usually there is not enough of the saw-dust or other coarse fuel to operate the boiler continuously except in combination with pulverized coal. Therefore, when such fuel is available I introduce it in a downward direction intermediate the streams of pulverized fuel, whereby such fuel is effectively subjected to radiant heat, not only from the refractories but also from the already burning flames, the saw-dust streams being for all practical purposes subject on all sides to radiant heat or flame. Hence this fuel is very largely consumed before it ever reaches the bottom.

A portion of the air required for combustion is admitted thru. the burners, particularly the pulverized fuel burners and secondary air for combustion is admitted thru the inlets 10, the air admitted thru such inletsbeing pre-heated and assisting thereby in the burning of the saw-dust. The air admitted thru the inlets 19 also tends to complete the combustion of the'saw-dust before it reaches the ash-pit, this being so particularly where such air is introduced under pressure which has the effect of producing swirling and agitation in the lower regions of the combustion space. If, for any reason, some of the saw-dust should lodge in the bottom while still burning, the air admitted thru the

inlets

21 and 22 will serve to complete the combustion thereof on the floor of the ash-pit. If heavier fuels are used the screen Will function some what as a grate, in which event the.

grade pulverized coal and relatively coarse low grade fuel in a combustion chamber having an ofi'take in an upper part thereof which includes admitting the relatively high and low grade fuels in alternately arranged streams of flattened configuration, the said streams presenting their flat surfaces to each other and being directed downwardly to bend on edge to said ofitake.

In testimony whereof, I have hereunto signed my name.

ARTHUR V, ADAMSON.