US2276025A - Water cooled baffle and wall - Google Patents

Description

March 10, 194-2. G. w. DAVEY 2,276,025

WATER COOLED BAFFLE AND WALL Filed April 29, 1940 Juan wafer 6501265 W DA VEY Patented Mar. 10, 1942 UNITED STATES PTET OFFICE WATER COOLED BAFFLE AND WALL George W. Davey, Worcester, Mass. Application April 29, 1940, Serial No. 332,146

8 Claims.

This invention relates to water cooled baffles and walls, and more particularly to a 'novel and advantageous construction including blocks of refractory material mounted upon spaced parallel water tubes to form a baflle for a water tube boiler or to provide a water wall for a furnace.

It is a common practice to construct boiler baflies of refractory blocks which rest by gravity against the water tubes, but such blocks are easily displaced by the puffs or sudden slight increases in furnace pressure frequently encountered when burning oil or pulverized coal. It has been proposed to solve this problem by interlocking the blocks with the tubes, but such constructions have covered so much of the tube surface as greatly to reduce the transmission of heat thereto. In some boilers this has caused damage to the tubes through lack of adequate water circulation therethrough', and in the case of water walls it has in certain instances resulted in too high a furnace temperature, Furthermore, the interlocking type of block heretofore used is not only expensive to manufacture, but it has to be of small size to permit assembly, so that a large number of blocks are required.

It is accordingly one object of the invention to provide blocks of refractory material which will interlock with the water tubes of a boiler or water wall to close the spaces therebetween, and yet leave a substantial part of the tube surface exposed for the absorption of heat.

It is a further object of the invention to provide a refractory interlocking bafile construction which will be comparatively inexpensive to manufacture and install.

It is a further object of the invention to provide a refractory block which can be made of comparatively large size and yet will interlock firmly with the water tubes.

With these and other objects in view, as will be apparent to those skilled in the art, the invention resides in the combination of parts set forth in the specification and covered by the claims appended hereto.

Referring to the drawing illustrating one embodiment of the invention and in which like reference numerals indicate like parts Fig. 1 is an elevation of a water cooled baille or wall, viewed from the front or furnace side thereof;

Fig. 2 is a section on the line 2-2 of Fig. 1;

Fig. 3 is a section on the line 33 of Fig. 1;

Fig. 4 is a front elevation of a refractory block; and

Fig. 5 is a perspective view of the block.

The embodiment illustrated comprises a row of spaced parallel upright water tubes H] which may form a part of a steam boiler or a furnace water wall. The spaces between these tubes are closed by means of blocks ll constructed of a suitable refractory material, such as fire clay.

Each block H, as viewed in Fig, 4, is generally rectangular in shape, with a height or length considerably in excess of its width. The width of the blocks is somewhat greater than the distance between the tubes I ll, so that each block may bridge across from one tube to the next, the blocks making contact with the surfaces of the tubes in the rear of the plane defined by the axes of the tubes. Concave cylindrical surfaces l2 are preferably formed along the opposite sides of the blocks so that they may fit closely against the tubes. Two lugs M are provided on the font of each block at diagonally opposite corners thereof, these lugs being shaped to make contact with the front surfaces of the tubes and'thus lock the blocks in place on the tubes. I The rear surfaces of the lugs M'form forward continuations of the surfaces [2. Thus it will be apparent that each block has at opposite sides thereof two concave cylindrical surfaces the axes of which are parallel, these surfaces throughout most of the length of the block being behind the plane of the axes and extending forwardly of said plane' only at two diagonally opposed portions of the block. In order to strengthen'the block, the two lugs l4 may be connected by a diagonally extending rib l5. V

The block is moved into place againstthe tubes from the rear thereof, and to allow the lugs M to pass forwardly between the tubes it is necessary first to tip the block laterally, as shown in the upper right portion of Fig. 1; During the forward movement of the block it will be turned. in a clockwise direction to bring it into its proper position. To facilitate assembly of the parts in this-manner, the two diagonally opposite front corner portions of the block, which are not covered by the lugs M, are cut back or relieved as indicated at 16. This relieving starts about midway of the block and gradually increases toward the end of the block, so that there will be no interference between these corners and the tubes during the combined turning and forward movement of the block.

In many installations there may be no direct access to the rear side of the water tubes, and it will be necessary to pass the blocks rearwardly between the tubes from the front or furnace side thereof. In order that this may be possible, the

thickness of the blocks is preferably slightly less than the distance between the tubes. With this construction, the block may be turned sidewise and passed rearwardly between the tubes while in that position, as indicated by one of the blocks in Figs. 1 and 3.

The adjacent ends of the blocks in each row preferably interfit to provide tight joints. In the embodiment illustrated ship-lap joints are obtained by forming a recess H3 at the lower rear corner of each block and an upwardly extending rib l9 at the upper rear corner thereof to fit within the recess N3 of the block above.

It will now be apparent that the blocks are firmly interlocked with the water tubes, and yet the water tubes are fully exposed to the furnace heat except for the comparatively small area covered by the lugs M. The blocks are much longer than the interlocking blocks heretofore used, and hence a smaller number of blocks will be required and the cost of installation will be reduced.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A water cooled baffle or wall adapted to be exposed at its front side to the heat of a furnace and comprising a row of spaced parallel Water tubes, and a row of blocks between each pair of adjacent tubes and provided with surfaces at opposite sides in engagement with the rear surfaces of the tubes, each block having two lugs on opposite sides thereof which engage the front surfaces of the tubes to lock the block in place, the lugs being offset from each other in a direction lengthwise of the tubes.

2. A water cooled baiile or wall adapted to be exposed at its front side to the heat of a furnace and comprising a row of spaced parallel water tubes, and a row of blocks between each pair of adjacent tubes and provided with surfaces at opposite sides in engagement with the rear surfaces of the tubes, each block being generally rectangular in shape as viewed from the front, and having two lugs on opposite sides thereof which engage the front surfaces of the tubes to lock the block in place, the lugs being located adjacent diagonally opposite corners of the block.

3. A water cooled bafile or wall adapted to be exposed at its front side to the heat of a furnace and comprising a row of spaced parallel water tubes, and a row of blocks located between each pair of adjacent tubes and provided with two concave surfaces at opposite sides in engagement with the rear surfaces of the tubes, each block being generally rectangular in shape as viewed from the front, and having two lugs on opposite sides thereof which engage the front surfaces of the tubes to lock the block in place, the lugs being located adjacent diagonally opposite corners of the blocks,

4. A water cooled baffle or wall adapted to be exposed at its front side to the heat of a furnace and comprising a row of spaced parallel water tubes, and a row of blocks located between each pair of adjacent tubes and engaging the rear surfaces of the tubes, each block being generally rectangular in shape as viewed from the front, with a width somewhat greater than the distance between the tube and a length considerably greater than its width, each block having two lugs locatedadjacent diagonally opposite corners of the block and engaging the front surfaces of the tubes to lock the block in place.

5. A water cooled baffle or wall adapted to be exposed at its front side to the heat of a furnace and comprising a row of spaced parallel water tubes, and a row of blocks located between each pair of adjacent tubes, each block being provided with two concave cylindrical surfaces at opposite sides thereof shaped to engage the rear surfaces of the tubes throughout most of the length of the block and to engage the front surfaces of the tubes only adjacent diagonally opposite portions of the block.

6. A water cooled baffle or wall adapted to be nace and comprising a row of spaced parallel .water tubes, and a row of blocks between each pair. of adjacent tubes and engaging the rear surfaces of the tubes, each block being generally rectangular in shape as viewed from the front, with a width somewhat greater than the distance between the tubes and a length considerably greater than its width, each block having two lugs located adjacent diagonally opposite corners of the block and engaging the front surfaces of the tubes to lock the block in place, the thickness of the blocks being less than the distance between the tubes.

7. As an article of manufacture, a block of refractory material generally rectangular in shape, as viewed from the front, and having at opposite sides thereof two concave cylindrical surfaces with parallel axes, these surfaces throughout most of the length of the block being behind the plane of the axes and extending forwardly of said plane only at two diagonally opposed portions of the block.

8. As an article of manufacture, a block of refractory material generally rectangular in shape, as viewed from the front, and with a length considerably greater than its width, the block having at its long-sides two concave cylindrical surface with parallel axes, these surfaces throughout most of the length of the block being behind the plane of the axes and extending forwardly of said plane only at two diagonally opposed portions of the block.

GEORGE W. DAVEY.

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