US1795951A

US1795951A - Apparatus for burning pulverized coal

Info

Publication number: US1795951A
Application number: US46991A
Authority: US
Inventors: Stanley A Jacques
Original assignee: Int Comb Eng Corp
Current assignee: International Combustion Engineering Corp
Priority date: 1925-07-30
Filing date: 1925-07-30
Publication date: 1931-03-10
Anticipated expiration: 1948-03-10

Description

March 10, s JACQUES 1,795,951

APPARATUS FOR BURNING PULVERIZED COAL Filed July so; 1925 v V QINVENTOR Wv-W ATTORNEY} atented Mar. 10, 1931 UNITED STATES PATENT F K I I Y.

STANLEY A. JACQUES, or CHICAGO, ILLINoIs ss'IGNo TO INTERNATIONAL com- BUSTION ENGINEERING QORPORATION, A CORPORATION on DELAWARE .APIBARATUS FOR BURNING PULVERIZED COAL Application filed July 30,

. This invention relates to the art of burning pulverized coal and is particularly useful in the burning of finely divided fuel under stationary boilers.

In many forms of apparatus for the burning of pulverized coal under statlonary bo1lers, the fuel is admitted thru a plurality of burners arranged in a row. The installations are operated at all ratings from purely nom- 1o inal loads to maximum or peak loads, the

amount of coal being burned at any particular time being dependent upon the rating at which the installation is then being operated. To meet this condition'it has been customary to cut out one or more burners or to increase the number of burners which are supplying coal as the case may be No difficulty 1s encountered when all of the burners are feeding coal. However, it is quite difficult to secure a balanced flame when. cutting out one or more burners, the disposition of the burners in present standard practice being such that an unbalanced flame condition arises by virtue of the fact that more coal will be admitted 1n one partof the combustion chamber-than in an-v Fig. l'is a diagrammatic partial front elevation of a boiler and furnace setting equipped with my improvements;

Figs. 2, 3 and 4; inclusive illustrate how the invention may be put into effect with the arrangement shown in Fig. 1 p

Fig. 5 shows a modified arrangement for 5 carrying out my invention; and

.to the furnace by means of a pipe or pipeslO,

nozzles are burnercastings 14: thru which ad- 1925. Serial No. 46,991.

F ig. 6 shows another modification applicable where direct firing is desired. Referring now to F ig. 1 the reference character A indicates acombustio'n chamber which has an outlet towards the rearof the arch "or roof 7, thru which the products of combustion pass-upwardly to the boiler 8, which may be of any conventional design.

The front wall of the combustion chamber is provided with a plurality of air inlets 9 thru which air may be admitted for combustion, under contro i i I The coal preferably with'carrying air, is conducted from a suitable source of supply in this case but one pipe being shown. This pipe '10 branches, in the present showing there being three branches 11. Each of the branches is controlled by a damper, or other suitable control device 12. Y

Secured to each pipeis a burner nozzle 13, these burner nozzles changing from a circular crosssection to a flat elongated cross section. 'The burner nozzles are, therefore, of the fish-tail type. Surrounding the" burner ditional air for combustion may beadmitted. Referring now to Fig.'1 it will be seen that the middle nozzle'l3 is located centrally of the arch ,7 and discharges downwardly with'the long dimension in cross-section of the sheet of fuel delivered thereby parallel to the front wall. The two outer? burners are set at right angles to the middle nozzle. a The manner in which the arrangement is operated to secure substantially balanced flame conditions is diagrammaticallyindicated inFigs. 2, 3 and 4. At low. ratings fuel would only be supplied thru the middle nozzle as shown in Fig. 2. At an intermediate rating the powdered coal would be supplied. thru the outer burners and the middle burner would be cut out as indicated in Fig. 3. At go maximum rating all three burners would be supplying coal as indicated in Fig. 4.

It is customary to set the burners alike, that is they would all be disposed as is the central burner or they would all be disposed as are the outer burners of Fig. 1. It now, with either arrangement, a burner or burners are cut in or cut out to meet the opera ing conditions described, it will be seen that it will be diihcult to obtaina balanced flame condition. With the alternate arrangement of the burners a much more nearly uniform flame condition will result under all operating conditions.

In Fig. 5, I have illustrated an elaboration or development of the arrangement to take care of a larger furnace. the central burner may be used alone for very low ratings, or that the two burners on either side of the central burner may alone be used; or that the middle and the two end burners may be used; with the production ofsubstanti'ally uniform or balanced flame conditions within the combustion chamber. The inlets 9 are suitably controlled by dampers, so that these may be cut in and cut out as the occasion may demand.

The disposition of the burners alternately at right angles to one another, is one that lends-itself particularly well to the purposes of the invention. The independent control of the auxiliary air inlets also makes it pos sible to secure proper air admission for the various firing conditions described.

InFig. 6 I have illustrated a modification which is applicable when it is desired to have a direct fired pulverized coal burning instal lation, i. acne in which the burners are fed with fuel directly from the pulverizer. In this case the burners are supplied by two mills, mill 15 supplying the fuel through pipe 17 and branch pipes 18 to the outside burn ers, and mill 16, which is preferably of smaller capacity, supplying the fuel to the middle burner through pipe 19.

In this construction mill 15 would be shut down at low ratings the fuel being supplied to the middle nozzle only by mill 16. At intermediate ratings mill 16 wouldbe shut down and the two end burners would be sup plied by 'mill 15. At high ratings both mills and all burners would be used.

This arrangement could also be applied to the construction of Fig. 5, alternate burners being supplied by the same mill,'the larger mill supplying the outside and middle burners and the smaller mill supplying the other two.

I claim:

1. In combination, a combustion chamber and means for admitting sheets of finely divided' fuel and air thereto comprising a row of independently controlled burners delivering substantially in the same direction and having delivery ends elongated in cross-sec- It will be seen that.

tion and alternately set substantially at right angles to each other.

2. In combination, a combustion chamber and means for admitting sheets of finely divided fuel and air thereto comprising a row of independently controlled burners alternately set substantially at right angles to each other with the middle burner set to deliver a sheet substantially parallel with theiront wall.

In combination, a combustion chamber andineans for admitting sheets of finely divided fuel and air thereto comprising a row of burners delivering substantially in the same direction and having delivery ends elongated in cross-section and alternately set approximately at right angles to each other.

at. In combination, a combustion chamber and means for admitting sheets of finely divided fuel and air thereto comprising a row of burners having delivery ends elongated in cross-section and alternately set approximately-at right angles to each other and delivering the fuel downwardly-into the combustion chamber. y 7

5. In combination, a combustion chamber and means for admitting sheets of finely dividediuel and air thereto comprising a row of burners alternately set approximately at ri ht angles to each other and delivering the fuel downwardly into the combustion chamber adjacent an upright wall thereof, together with means for admitting air at a plurality of points through such wall;

6. In combination, a'combustion chamber, a row of finely divided fuel burners deliver ing in one general direction and having flat nozzles set alternately cross-wise to each other, said burners having independent controlling means so that burners may be. out in or out, a'plurality of air inlets adapted to supply combustion air up to maximum demands and positioned to deliver air adjacent the streams of fuel from the burners, and control means whereby inlets'may be cut in or out as burners are cut in or out.

7 1. Apparatus for the burning of pulverized coal comprising a combustion chamber, and

plurality of i'uel'and air delivery. burners directed thereinto in the samegeneraldirection, said burners having delivery e11ds.elon gated in'cross-section, the longer axes of the delivery ends of alternate burners being set cross-wise with relation to the longer axes of the delivery ends of the other burners.

8. Apparatus for the burning of pulverized coal comprising a combustion chamber, and a plurality of fuel and air delivery burners directed thereinto in the same general ,direction, said burners having delivery ends elo'ngatedin cross-section, the longer axes of the delivery ends of alternate burners being set cross-wise with relation to the longer axes of the delivery ends of the other burners, together with independently operablefueI-delivery means to each set of alternate burners.

9. Apparatus for the burning of pulverized coal comprising a combustion chamber, and a plurality of fuel and air delivery burners directed thereinto in the same general direction, said burners having delivery ends elongated in cross-section, the longer axes of the delivery ends of alternate burners be- 7 ing set cross-wise with relation to the longer 10 axes of the delivery ends of the other burners,

together With independently operable fueldelivery means to each burner. A

In testimony whereof,' I have hereunto signed my name.

I STANLEY A. J AOQUES.