Specification of William Foster : steam boiler furnaces.

  • Foster, William.
Date:
1858
Catalogue details

Licence: Public Domain Mark

Credit: Specification of William Foster : steam boiler furnaces. Source: Wellcome Collection.

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    ' Foster s Improvements in Steam Boiler Furnaces, §c. vertical section of a muititubular boiler with the two fire boxes constructed according to my present Invention; Figure 2 is a sectional plan of the same; Figure 3 is an end elevation of the boiler; Figure 4 is a transverse section taken along the line 1 — 2, in Figures 1 and 2; and Figure 5 is a similar section taken along the line 3 —4, in Figures 1 and 2. A, A, are the two fire 5 boxes, and B the series of tubes. A fire-brick bridge C is built in each fire box or furnace immediately behind the fire-bars, and is carried up considerably higher than usual, as shewn in the Drawings, for the purpose of confining the flames blown over by the fan-blower D, herein-after more particularly referred to. A short distance behind the bridge C is built a second bridge E, of the 10 same height as the first one, and behind this last bridge are constructed a number of fire-brick walls or partitions F, F, disposed longitudinally inside the two fire boxes, and extending from the bottom to the top of the same, Intermediate spaces are left between these partitions to admit of a free cir¬ culation of the air, flame, and gases, which latter are ignited and burnt by the 15 heat of the fire-brick partitions. The air may or may not be supplied by a fan-blower, shewn at D, the air pipes G from which, when employed, enter each furnace separately immediately beneath the fire bars. The ash-pits H, H, are entirely closed, excepting at the part where the air pipes enter. I is a hinged valve for adjusting or regulating the air supply when fresh fuel is 20 being thrown on. The heads of these pipes are made to open or turn back, as shewn at K, for the purpose of enabling the ashes to be cleared out of the ash¬ pit ; L, L, are holes in the furnace doors, to admit of a poker being introduced for the purpose of removing clinkers and cleaning the fire bars ; M represents a fire-brick lining to the roof of the fire box, such lining extending along the 25 entire length of the fire bars, and greatly assisting the combustion of the smoke and gases by reason of the great heat which \t imparts to them on their passage along the furnace; Figure 6 represents a longitudinal vertical section of a multitubular boiler similar to the former, but shewing another modification of my improvements ; Figure 7 is a corresponding sectional plan 30 of the same; Figure 8 is a transverse section taken along the line 1 — 2, in Figures 6 and 7; Figure 9 is a similar view taken along the line 3 — 4; Figure 10 is a section taken along the line 5 — 6 ; and Figure 11 is a similar view taken along the line 7 — 8, in Figures 6 and 7* According to this modi¬ fication, I effect a more perfect combustion of the smoke and gases in steam 35 boiler furnaces by lowering slightly the bridges C and E, and lining both the roof and bottom of the fire box internally with fire-brick, as shewn at M, the lining extending along the whole length of the furnace. F, F, are partitions of fire-brick arranged transversely across the fire boxes or flues behind the