US970868A - Mechanical stoker. - Google Patents

Description

W. R. WOOD. MECHANICAL STOKER.

APPLICATION FILED FEB. 23, 1910.

Patented Sept. 20, 1910.

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W. R. WOOD.

MECHANGAL STOKEIL AIPLIUATION FILED 1r.B.2s, 1910.

Patented Sept. 20, 1910.

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WILFRED ROTHERY WOOD, 0F LONDON, ENGLAND.

MECHANICAL STOKER.

Specification of Letters Patent.

Patented Sept. 20, 1910.

Application filed February 23, 1910, Serial No. 545,476.

To all'whom it may concern.'`

Be it known that I, lViLrnno Ro'runnr 7001), a citizen of the United States'of America, and a resident of London, England, have invented a certain new and useful Improvement in Mechanical Stokers, 'of

which th 'following is a specification. Amongother roposals that have been 'made for feeding uel furnace chambers may be mentioned a construction in which end less chains formed of pivoted. links are caused to pass from a sprocket wheel approximately beneath the fuel feedhopper to a second sprocket wheel at the back of the furnace where the chains encounter a Stripper plate which remove the unconsumed fuel or refuse which passes thence to the ash pit. I n such construction the air to support the combustion is usually if not always supplied by induced or natural draft entering through the ash pit and passing up between thelinks of the endless chains. l

As the coal is naturally of greater depth and of closer texture taken as a mass at the feed.end than it is at the rear end after artial consumption and coking, difficulty has been experienced in securing equality ,of con'ibustion and suitable distribution of 'air throughout the length of the fire chamber, and to partially obviato this drawback it has been proposed to place an inclined plate or series of plates at or near the rear of the furnace beneath the chains and by regulating their angle of opening either with relation to the chains or to fixed plates to limit or increase the amount of air which will pass through the chains at. those points, and various other proposals have been made for regulatingl the relativi amounts of air passed to different sections of furnace grates.

According to my prior British Specification No. 13334: of 1907 it is proposed to employ as the grate surface complete box or channel sections linked together and which may be conveniently formed of a bottom section carrying the link yan upright section formed in one therewith and an attached angle section .st-feared to the upright section the outer end of the attached section being adapted to pass just over the upright sec tion next in order thus forming open ended boxes when the channels are traveling horizontally and with such construction not only is a practically7 evenv grate surface (,)btained but when the channel sections are traveling around the inner sprocket wheel any small dust which may have possibly crept in will be discharged by gravity from the then open side of the box, the top sections of which are provided with holes tor the admission of air to the fuel while the lower sections arc provided with one or more end openings corresponding with longitudinal slots in a fixed draft box which slots can be more or less closed by pivoted longitudinal plates capable of being operated by lever and crank connections from outside the boiler wall.`

The above yconstruction is etiicaciousfor the purpose intended but in many cases where the distance from the front to the hack of the grate is 3 to G or more meters in length it is diiiicult to remove the ash and any unburned fuel from the back of the ash pit and this drawback is overcome according to the present invention by so constructing the channel sections that when they open at the back ofthe furnace the ash and any unburned fue'l will fall into the open chan# nels which will then close and carry the ash and nnconsumed fuel to the front of the ash pit where on the channel sections opening the refuse will he discharged. i ln other words by reversing the direction of the. top plate shown in my prior British s iecitica tion it 1s possible to deliver the ash ant unburned fuel at the front of the ash pit instead of at the rear.

In the accompanying.drawing:-Figure 1 is a side sectional elevation of a traveling grate according to this invention, and Fig. 2 is a cross section on :4 of Fig. 1.

As shown in the drawing, 1 is the hop c1', 2 the sprocket wheels carrying the end ess 'chains shown in Figs. 1 and 2 as consisting of links 3 from which project T or channel pieces -It which in conjunction with piece 4 on the link next in order forms the top or outer face or fuel carrying surface when traveling horizontally. T or channel pieces 4 have the bottom fiange turned up at the ends and pieces cut out tov make with the link next in order an opening or port 10 for the air inlet as hereafter described, or the entire channel piece taken as a whole may be made as a single casting.

The air to support combustion is shown as entering from pipes 7 into draft boxes 8 passing thence through openings 9 to ports 10 in the grate bars and thence through openings 11 to the fuel.

The amount of air passing to ports 10 'may be governed by a plate or gate pivoted near the front of draft box 8 and raised or lowered at the inner end by any suitable connections, or as. shown in the drawings the plate 'or gate 12 may be tapered and hin ed 'at the side 13 so that when lowered ull draft is open throughout all the top channels and when raised as Shown in Fig. 2 is full open near the front and gradually decreases the air inletl toward the rear Where l it is practically closed.

`With 'the construction shown -it will be noted that beneath the outer face of the top of each channel is an inclosed air chamber traveling With the link and receiving and 'delivering the air as it travels to the rear of carry forward the inclosed ash orunburned fuel and discharge same atA the front of the ash pit as the channel sections 'o en on going around the front sprocket whee erases What is claimed is l. ln traveling grate stakers of the clas's described a fuel carrying surface formed'by the upper plates of a series of contacting channel sections, means for so separating and closing the contacting channel sections at the inner and outer ends of the furnace that the ashv and' unburned fuel will be' caught wit-hin the channel sections at they inner end and delivered at the outer end of the furnace.l

2. In traveling grate stokers, endless chains channel sections adapted tov contact' carriedtherebmmeans for admitting-air at" the ends of the sections, means for so opening and closing -the channel. sections at the inner and outer ends of the furnace thatthe ash'and unburnedfuel will be caught Within the sections at thefinner end and delivered at the 'outer end of the furnace.

In testimony whereof I have hereunto'eet my handin the'presence of two subscribing witnesses. y

WILFRED ROTHERY Woon.

Vitnesses:

B. HENDERSON, f H. C. WOODGRAFT.

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