US2257287A - Grate bar - Google Patents

Description

Sept. 30, 1941. c. v. THORSELL GRATE BAR Filed June 1, 1939 INVENTOR CARL V, 77/0R5ELL.

Patented Sept. 30, 1941 UNITED STATES PATENT OFFICE 7 Carl V. ThorsellQWest Hempstead, N. Y., assignor r to Combustion Engineering Company,- Inc.,

New York, N. Y.

Application June 1, 1939, Serial No. 276,760

3 Claims.

The present invention relates to improvements in that type of grate bar having passages therein for the flow of air into a chamber below the grate bars and thence up between adjacent bars into the fuel.

Grate bars of this type are hollow so that air may enter a bar at one end from a primary air chamber and flow through a passage extending longitudinally of the bar to a secondary air chamber and thence upwardly between adjacent bars into the fuel carried by the bars. To provide the circulation of air the bar is provided on its under side with an opening near the head or retort end of the bar communicating with the primary chamber and a similar opening at the toe end of the bar in communication with the secondary air chamber, these openings communicating with the longitudinal air passage in the bar. An object of the present invention is to provide means for regulating the flow of air through the interior of the bar and directing it against the toe of the bar to cool the latter.

In the rawing, Fig. 1 is a longitudinal sectional view through part of a stoker provided with grate bars embodying the present invention; and

Fig. 2 is a sectional view on the line 22 of Fig. 1.

In Fig. 1 the numeral 10 designates a wall of the retort of a stoker furnace and H the outer wall of a secondary air chamber located beneath the grate. The intermediate partition l2 separates the primary air chamber l3 from the secondary air chamber I4. The grate bars I5 rest upon the walls l and H closing the top of the air chambers. Alternate bars are reciprocable and a rocker bar l6 extending transversely of the grate has a flange or key I! engageable between the lugs IE on the reciprocable bars for rocking them to feed the fuel away from the retort.

As mentioned above the grate bar I is hollow and has an air passage 20 extending longitudinally of the bar, the passage being defined by the top wall 21, bottom wall 22 and the side walls 23 of the bar. In the bottom Wall 22 near the head end of the bar is an opening 24 placing passage 20 in communication with the primary air chamber l3 while at the toe end of the bar the bottom wall 22 is formed with an opening 25 placing passage 20 in communication with the secondary air chamber 14. Air supplied to the primary air chamber l3 flows through the opening 24 along the passage 20 in the bar and out through the opening 25 into the secondary air chamber [4 and thence upwardly between adjacent bars to the fuel bed. Some of the air may also pass through openings 26 and 21 in the end and top wall of the bar near the head thereof.

Mounted on the bottom wall 22 of the bar at or adjacent the rear edge of air outlet 25 near the toe end is a baffle plate 30 extending upwardly into the air passage 20. The baflle plate Ellis inclined forwardly toward the toe of the bar and extends across the air stream passing through passage so as to direct air against the inner wall or toe of the bar to maintain it cool. Baffle plate 38 is provided with an elongated slot 3! so that it may be adjustably mounted on a bolt 32 carried on the bottom wall of the bar and held in place by a nut 33. This mounting of the bafile permits it to be adjusted so that it may be projected into the air passage 20 to the extent desired to provide for cooling of the toe of the bar. Baflle plate 30 may also be adjusted to restrict the efiective area of outlet and thus regulate the flow of air from the air passage 23 acting as a sort of dam, and forcing more air to pass through the openings 26 and 21 at the head of the bar.

It is understood that the rocker bar I6 and flange or key I! and the lugs l8 on the reciprocable bars may be located near the toe end of the grate bar I5 and that air chamber M might be the primary air chamber and air chamber 53 the secondary air chamber. The air would then flow from chamber l4 through opening 25, be directed into the toe of grate bar 15 by damper and flow thence through bar passage 20 and downwardly through opening 24 into secondary air chamber i3 and up between adjacent bars. Some of the air would pass out through openings 26 and 27.

What I claim is:

1. In a grate bar having a longitudinal air passage defined by the top, side and bottom walls of the bar and extending from its head end to its toe end with openings in said bottom wall adjacent the head and toe of the bar for placing said passage in communication with air compartments of a stoker so that air may flow through the bar from its head end to its toe end; a bafile plate extending into and across said air passage from thelower wall of said bar near the rear edge of the air opening adjacent the toe of the bar and inclined toward said toe for directing air flowing along said passage against said toe.

2. In a grate bar having a longitudinal air passage defined by the top, side and bottom walls the toe of the bar and inclined toward said toe 10 for directing air flowing along said passaf-imv against'said toe; and means for adjustably supporting said battle on said bottom wall of said bar.

3. In a grate bar having a longitudinal air 15 passage defined by the top, side and bottom walls 7 of the bar and extending from its head end to its,

toe end with openings in said bottom wall adjacent the head and toe of the bar for placing said passage in communication with air compartments of a stoker so that air may flow from the head to the toe end of the bar; a movable baflle plate extending upwardly from the bottom wall of said bar into said air passage from a point adjacent the rear edge of the air opening at the toe end of said bar and inclined towards said toe for directing air against the internal Wall of said toe; and means for adjustably supporting said baflle plate on said bottom Wall.

' CARL V. THORSELL.

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