Longitudinal and cross sections of a Reed water tube boiler as installed in torpedo boat destroyer HMS  Lightning of 1895: the black lines adjacent to and above the steam-generating tubes in the cross section are baffles designed to optimise the passage of hot gases around the tubes.

11-08-2019· The total quantity of water flowing in downcomers and risers is the same. However the number of riser tubes should be higher in order to have maximum heat transfer in the furnace. Therefore, the cross section of each riser tube is less than that of downcomers so that they have a higher surface area and hence higher heat transfer.

The boiler is a watertube boiler, with these tubes contained within a vertical, cylindrical outer drum. This drum is double-walled and forms a water jacket around the boiler, with a large vertical flue within. The inner flue has a complex cross section. It is stepped in three diameters, tapering towards the top.

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  Why is a water tube boiler more efficient? - Quo

  • Overview08-05-2019· The cross section of the water tube boiler tube is smaller than that outside the tube, so the steam flow rate is greatly increased, and the steam generated on the heated surface is immediately washed away, which increases the heat absorption rate of the water.
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04-03-2020· The working principle of cross drum boiler is same as longitudinal drum boiler. The feed water is fed to the cross drum through feed water inlet. Then this water comes down through the down-comer pipe and enters into inclined water tube placed in hot chamber.

In a longitudinal straight tube boiler the downcomer fed a) "cool" water to the steam drum b) "hot" water to a riser c) "cool" water to a rear header d) "cool" water to a front header e) "hot" water to the water tubes. C. A packaged watertube boiler having two mud drums is the a) "O" type b) "D" type c) three drum bent-tube type d) "A" type e) Sterling type. D. High pressure watertubes a) are always smaller …

Water drum size is limited to that required to receive the generating tubes, for modern radiant heat boilers with only a single bank of screen tubes and no generating tubes between the drums, the water drum has been replaced by a header and the downcomers fed straight to the waterwall headers.

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  water tube boiler cross section – zozen coal fired boil

  • OverviewThe cross section of the water tube boiler tube is smaller than that outside the tube, so the steam flow rate is greatly increased, and the steam generated on the Ask Price View More Boilers – Marine Engineering – UK
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