US1926046A - Water tube boiler baffle - Google Patents

Description

Sept. 12, 1933. HICKS 1,926,046

WATER TUBE BOILER BAFFLE Filed Nov. 12 1930 2 Sheets-Sheet 1 INVENTOR L ESL/E AZ H/C/(S ATTORNEY 1.. A. HICKS 1,926,046

Sept. 12, 1933.

' WATER TUBE BOILER BAFFLE 2 Sheets-Sheet 2 Filed Nov. 12 1930 INVENTOR LESLIE 19. HICKS ATTORNEY Patented Sept. 12, 1933 WATER TUBE BOILER BAFFLE Leslie A. Hicks, Honolulu, Territory of Hawaii Application November 12, 1930 Serial No. 495,029

4 Claims.

This invention relates to boilers, and more particularly to special construction of battles water tube boiler characterized by a plurality of tube banks and longitudinal baffles to tudinal baflies and bafile spacer supports for a tube boiler which provides gas in which the gases sweep along and around the tubes adjacent to the bafile.

A further object of the invention is to provide a bafile arrangement in a water tube boiler limiting the corrosion on the gas side of the water tubes.

Other objects will be apparent to those skilled in this particular art from the description in the specification in connection with the attached drawings, in which- Fig. 1 is a side view of the boiler setting embodying this invention;

Fig. 2 is a detail view of an embodiment of the invention;

Fig. 3 is a sectional View taken along the line 3-3 of Fig. 2;

Fig. 4 is a sectional view taken along the line 4 l of Fig. 2.

In the embodiment of the invention chosen for purposes of illustration there is shown in Fig. l a boiler of the Stirling type, mounted in a conventional boiler setting.

Three upper drums 1, 2 and 3 are joined together by steam circulators 4: and 5, and the drums 2 and 3 are further connected by water circulators 6.

The

drum 1 is connected with a lower drum 7 by means of steam generating tubes 8. The upper drum 2 is connected with the lower drum 7 through steam generating tubes 9 and 10, and the upper drum 3 is connected with the lower drum through the tubes l1, l2 and 13.

Tubes 12 have a panic 15 mounted thereon in a manner and for a reason to be described in detail later, and the rear row of the bank of tubes 10 has a baffle 20, similar in character to the balile 15, mounted thereon in a manner to be subsequently described.

In the ordinary baiiles known in the art that rest directly upon or against the row of tubes located at the desired baiile points, zones of no gas flow or still pockets are formed between the tubes and bafiies.

In all boilers the gases of combustion.

The greater the ratio of water vapor to other gases in the products of combustion from a furnace, the greater will be the tendency of the water vapor to condense, and the condensation will start at higher temperature.

When still or dead gas pockets are formed between a baffie and tubes, the temperature of the gases often drops to the dew point at that point, and condensation occurs, even when the temperature of the main stream of gases passing that zone is higher than the dew point.

When the sulphuric anhydride which is present in virtually all gases of combustion, in varying percent depending upon the amount of sulphur contained in the fuel, comes in contact with condensed water on the tubes, sulphuric acid is formed and serious corrosion takes place.

The battle assemblies 15 and 20 illustrating this invention are made up as shown in detail in Figs. 2 to 4 and include a plurality of refractory blocks 16 placed adjacent each other and resting on spacer bars 17. Pins 18 pass through the spacer bars into certain of the refractory blocks and thus hold the baflie assembly together. The length of the spacer bars will be such that an unequal expansion or contraction thereof with respect to the rest of the bafile assembly will not be sufjciently large to disrupt the assembly.

As shown in Fig. 1 in the baiile assembly 15, the spacer bars 17 thereof rest upon the inclined tubes 12 and the lower end of the assembly rests upon the lower drum 7. This assembly by virtue of the aforesaid arrangement is supported in place but left free to slide along the tubes 12 so that it will not be harmed by any unequal expansion or contraction of parts due to changes in temperature.

In the baffle assembly 20, the spacer bars 17 rest upon the inclined tubes 10 and the lower end of this assembly rests upon an angle bar 21 secured to the lower part of tubes 10. By virtue of this arrangement the assembly is supported in place but is allowed to move along the tubes when expansion or contraction takes place due to temperature changes.

The spacer bars 17 of the two assemblies 15 and 20 rest upon their several tubes and serve to separate the bafiie blocks therefrom. By virtue of this separation, the gases of combustion that are deflected by the block construction of the baiiie assembly are caused to sweep along and over the tubes, and the formation of any dead gas or still pockets is prevented, with the of combustion has a temperature above the dew point of the gases, the condensation of water on these tubes, with the subsequent formation of a corrosive agent, will be prevented.

This invention provides an effective bafile arrangement for limiting corrosion on the gas side of water tubes adjacent the baifies, and although a specific arrangement, has been shown and described, it is to be understood that changes, substitutions and additions may be made within the spirit of the invention as limited by the appended claims.

What I claim is 1. In a boiler characterized by a plurality of tubes and multiple gas passes, baiiles determin ing said gas passes and including a plurality of refractory blocks having adjacent abutting edges, spacer bars disposed between said blocks and certain of said tubes and secured to said blocks proximate'the ends of each bar.

2. In a boiler characterizedby a plurality of tubes and multiple gas passes, bafiies determining said gas passes including a plurality of refractory blocks having adjacent abutting edges, spacer barsdisposed between said blocks and certain of said tubes, and pins securing the blocks to said bars proximate the end of each bar. a 3. In a water tube boiler having a row of vertical tubes, a vertical baifie adapted to expand and contract longitudinally relative to said tubes and comprising horizontal rows of imperforate refractory blocks having abutting edge portions, narrow spacer bars extending transversely of and slidably contacting with said tubes and interposed between said blocks and tubes, and means for holding said bars and blocks in a unitary formation.

4. In a water tube boiler having a row of vertical tubes, a vertical baflle adapted to expand and contract longitudinally relative to said tubes and comp ising horizontal rows of imperforate refractory blocks having abutting horizontal edge portions, pin recesses formed in said edge portions, spacer bars extending transversely of and slidably contacting with said tubes and interposed between said blocks and tubes, and pins at horizontally spaced points on said bars fitting said recesses and holding said bars and blocks in a unitary formation.

LESLIE A. HICKS.

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