File:Bulletin (1910) (14799400713).jpg

Identifier: bulletin33unit (find matches)
Title: Bulletin
Year: 1910 (1910s)
Authors: United States. Bureau of Mines
Subjects: Mines and mineral resources Mines and mineral resources Mining engineering
Publisher: Washington U.S. Govt. Print. Off. (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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ate,which feature of construction makes the process of removing clinkerfrom the fuel bed while running rather difficult. In the front por-tion of the boiler on both sides the first and second rows of tubes nextthe furnace are so curved and placed mth respect to each other thatthey form a nearly gas-tight baffle. On the outside of each nest oftubes the last two rows are similarly placed along the full length ofthe boiler. This constructional feature is shown in figure 1 in thefiont view and in the section across the nest of tubes. The products of combustion flow to the rear of the furnace, wherethey enter the tube nests through the spaces between the tubes,which are left open for this purpose. Through the nests of tubes thegases flow to the front of the boiler and there turn up into the hoodand out through the stack. The gases pass through the tube spacesonly once. The path of the gases is indicated in the longitudinalsection through the boiler. APPLIANCES. -TUBES BENT TO FORM A BAFFLE
Text Appearing After Image:
100601°—Bull. 33—11- 10 TESTS OF COALS AXD BRIQUETS OX TORPEDO BOAT. The principal dimensions of the boiler and furnace are showai inTable 1. Table 1.—Dimensions of Xormand water-tube boUer and plain-grate furnace. Diameter of steam drum inches.. 35. 43 Length of steam drum do 150. 00 Diameter of mud drums : do 10. 75 Length of mud drums do 141. 75 Diameter of downcomers do 10. 75 Number of tubes - 1, 552 Outside diameter of tubes inches.. Ij^ Approximate length of tubes do 75. 5 Total heating surface square feet.. 2, 776.19 Length of furnace feet.. 9.16 Width of furnace do 6. 40 Height of furnace from grate to steam drum do 4. 65 Height of furnace from grate to bend of tubes do 3. 76 Approximate combustion space above grate cubic feet.. 136 Distance from front of furnace to opening among tubes feet.. 5. 5 Length of bars inches.. 37. 5 Average width of grate bars on top do . 375 Average width of air spaces do .56 Air spaces in grate (approximate) per cent.. .55 Area of grate sqbulletin33unit

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