US1618808A - Apparatus for burning powdered fuel - Google Patents

Description

Feb. .22 1927,

' 1,618,808 E. BURG APPARATUS. FOR BURNING POWDERED FUEL Filed March 21 1925 /"i WL I literacy Patented Feb. 22, 1927.

UNITED STATES PATENT OFFIQ/E.

' EUGEN BUR-G, OI ESSEN-ON-THE RUHB, GERMANY- APPABA'1US FOR BURNING POWDERED FUEL.

Application filed March 21, 1925, Serial No. 17,163, and in Germany March 28, 1924.

My invention relates to improvements in apparatus for burning powdered fuel,. and 'the object of the improvements is to provide an apparatus in' which the efliciency of the combustion and the life of the apparatus are increased. With this object in view my invention consists in providing a combustion chamber which is provided at one end with means for supplying powdered fuel, and which has air for supporting combustlon supplied thereto through passages IDEIClP III the side wall of the chamber and in a direction circumferential of the jet of powdered fuel flowing through said chamber. In the preferred form of the invention the supply of the powdered fuel'is made such as to 1mpart to the jet of fuel a whirling path For the purpose of explaining the invention, an example embodying the same has .been shown invthe accompanying drawing, in which the same reference characters have been used in all the views to indicate corresponding parts In said drawing.

Fig. 1 is a sectional elevation of the apparatusas used in connection with a steam boiler, and v p Fig. 2 is a section taken on theiline 2-2 of Flg. 1.

- In theexample shown in the drawing the in combustion apparatus comprises a combustion chamber 1 having a cylindrical wall 2 made from refractory material. At one end of the. said chamber a tubular inlet 4 of annular cross-section opens into the com- ?5 bust-ion chamber. said inlet having an intake pipe 6 and including a helical vane 5 adaptcd to impart whirling movement to the fuel. The wall 2 of the chamber is provided with transverse passages 3 for the admission of to air for supporting combustion, and in the example shown inthe figures and more particularly in Fig. 1, the direction of the said passages and the helical passage provided by the vane 5 are such that the air and the f fuel are whirled around within the combustion chamber in the same direction. But I wish it to be understood that I do not limit myself to this'feature, and that in some cases I dispose the said passages'relatively to eachother in such a way that air and-fuel are whirled around in opposite directions. The central part of thetubular member 4 has a cross-sectional area such as to permit access therethrough to the combastion chamber, and it is normally closed by a gate 7. At the end opposite to the fuel .inlet the combustion chamber is provided with a bottom discharge 8 for ashes, sa1d discharge being located adjacent tothe fire tube ,9 of a steam boiler 10 adapted to be heated from the combustion chamber 1. The cylindrical wall 2 is provided with a jacket 11, and the annular chamber 12 thus provided is divided by partitions 13 into chambers, each of the chambers being connected with the air supply main 14 by a pipe 15 comprising regulating means such as butterfly valves 16. Further, each chamber has a supply of steam through a pipe 17 including a cock 18 and connected with a steam supply pipe 19. As appears more particularly from Fig. 1 the inner wall of the annular inlet flares outwardly at its delivery end, so that the fuel is delivered into the combustion chamber in outward direction. l

In the operation of' the apparatus the fuel is admitted into the combustion cham: ber 1 through the pipe 4 along a spiral path. and when admitted to the saidchamber it is thrown against the wall 2. Within the chamber it is mixed with the air admitted through the passages 3 in tangential direction, and the mixture flows along a helical line of small pitch towards the fire tube 9.

By centrifugal action the solid particles of the fuel are thrown towards the wall of the combustion chamber, so that they move along a comparatively long path while being continuously brought into contact with fresh air. The volatile and readily ignited por tions move through the axial portion ofthe combustion chamber where their path is comparatively short. The ashes are separated from the combustion gases only at the end of-thd combustion chamber and above the discharge 8, because earlier separation is prevented by the tangential current of air. The air admitted through the wall of the chamber has a cooling action,' so that the wall is in a less degree subject to thedestructive action of the heat. The steam admitted from the pipe 19 is heated within the wall i 2, and it is decomposed within the said wall stood that I do not limit myself to. the construction shown in the drawing.

I claim: 1. An agilparatus for the burning of powdered e1 comprising a cylindrical retort having tangential slots through its cylindrical wall, a jacket extending about said cylindrical slotted wall and forming an annular air spaeetherewith, annular partitions for dividing said air space into adjoining oompartments, an air supply under pressure to each compartment w lerehy to mtroduoe air through the tangential slots and into the retort in a stream about the axis of the retort, and an annular inlet for the powdered material to the end of the retort and substantially coaxial therewith, said annular inlet havin an out-turned'inner portion for deflecting the powdered material toward the cylindrical slotted wall of the retort immediately on introduction of the material to the retort.

Y 2. An apparatus for the burning of powdered fuel comprising a cylindrical retort having tangential slots through its cylindrical wall, a jacket extending about said cylindrical slotted walland forming an annular air s ace therewith, annular partitions for dividing said air space into adjoining compartments, an air supply under ressure to each compartment whereby to introduce air through the tangential slots and into the retort in a stream about the powdered materi to the end of the retort and substantially coaxial therewith, said annular inlet having an out-turned inner portion for deflecting the powdered material toward the cylindrical slotted wall of the retort immediately on introduction of the material to the retort and a spiral vane in said annular inlet for impart-mg to the powdered material prior to introduction'into the retort a rotary movement about the axis of the retort. i

3. An a paratus for the burning of powdered uel comprising a cylindrical retort having tangential slots through its cylindrical wall, a jacket extending about said cylindrical slotted wall and forming an annular air s ace therewith, annular artitions'tfor divi ing said air space into a joinmg compartments, an an supply under pressure to each compartment whereby to introduce air through the tangential slots and into the retort in a stream about the axis of the retort, an annular inlet for the powdered material to the end of the retort and substantially coaxial therewith, said annular inlet having an out-turned inner portion for deflecting the wdered material toward the c lindrical s otted wall of the retort immediately on introduction of the partments.

In testimony whereotI hereunto aflix my signature.

' EUGEN BURG.-

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