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#BoilerManual #AirAndGasFlow #Section3 #Page31

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Alt = The image is sideways with the bottom along the right edge of the page and the top along the left. There are 4 different graphs arrayed in this image; Fig. 23 labeled Steam temperature without G.R. flow is in the upper left; Fig. 24 labeled Steam temperature with constant G.R. flow is on the upper right. The bottom two, from left to right, are Fig. 25 labeled Steam temperature with controlled G.R. flow and Fig. 26 labeled Steam temperature without G.R. flow. All 4 graphs have y axes in terms of Steam temp. (F) from 0 to 1005, with a dotted line across the graph at the 1005 mark; x axes are all marked Boiler load (percent), 0 to 100.

Fig. 23 displays an upward arching curve marked Uncontrolled steam temp. Fig. 24 has a solid horizontal line across the graph of undetermined value marked Constant G.R. flow and similarly displays an upward arching curve marked Steam temp. which overshoots the 1005 mark. Fig. 25 shows an upward arch in a curve that flattens out at the 1005 mark, marked Stem temp. Another curve is arching but going downward near the 100 mark; the curve is marked Controlled G.R. flow. Fig. 26 shows 2 gently arching curves, both below the 1005 mark, and not quite parallel to each other, with the upper curve marked Main steam and the lower curve marked Reheat. The two curves approach convergence from left to right but don't converge, as they approach the 100 mark on the x axis and 1005 mark on the y axis.

#BoilerManual #AirAndGasFlow #Section3 #Page31

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Alt = The image is sideways with the bottom along the right edge of the page and the top along the left. There are 4 different graphs arrayed in this image; Fig. 23 labeled Steam temperature without G.R. flow is in the upper left; Fig. 24 labeled Steam temperature with constant G.R. flow is on the upper right. The bottom two, from left to right, are Fig. 25 labeled Steam temperature with controlled G.R. flow and Fig. 26 labeled Steam temperature without G.R. flow. All 4 graphs have y axes in terms of Steam temp. (F) from 0 to 1005, with a dotted line across the graph at the 1005 mark; x axes are all marked Boiler load (percent), 0 to 100.

Fig. 23 displays an upward arching curve marked Uncontrolled steam temp. Fig. 24 has a solid horizontal line across the graph of undetermined value marked Constant G.R. flow and similarly displays an upward arching curve marked Steam temp. which overshoots the 1005 mark. Fig. 25 shows an upward arch in a curve that flattens out at the 1005 mark, marked Stem temp. Another curve is arching but going downward near the 100 mark; the curve is marked Controlled G.R. flow. Fig. 26 shows 2 gently arching curves, both below the 1005 mark, and not quite parallel to each other, with the upper curve marked Main steam and the lower curve marked Reheat. The two curves approach convergence from left to right but don't converge, as they approach the 100 mark on the x axis and 1005 mark on the y axis.

#BoilerManual #FluidCirculation #Section2 #Page31

From the convection pass floor inlet header, tubes extend into the furnace 9 feet at a 5 degree angle and bend back at a 35 degree angle to form the furnace arch (nose). Continuing on, this same circuit levels off and forms the pendant convection pass floor below the secondary superheater and outlet loop of the reheater. Finally, the path leads to the front wall convection pass intermediate header, which in turn supplies the front wall convection pass screen tubes up to the screen outlet header.

The second area supplied by the convection pass supply downcomer is the pendant convection pass side wall. From the side wall inlet headers, flow is straight up to the outlet headers in the penthouse. These sidewall tubes form the convection pass side wall enclosure.

Finally, the horizontal convection pass enclosure header is also supplied by the convection pass downcomer. As the name implies, the four enclosure walls are contained within this circuit. The front wall headers and tubes forms the lower CP front wall and flow into the intermediate header where they join the pendant CP floor tubes to supply the screen tubes. Discharge is through the screen outlet header.

The two side wall portions of the convection pass enclosure header rise above the reheater and PSH loops and continue on to and discharge into the upper side wall headers located in the penthouse.

The remaining horizontal convection pass enclosure circuit, the rear wall, travels directly up the convection pass rear wall outlet header located in the back end of the penthouse. At this point all convection pass circuits, pendant and horizontal, are lead from outlet headers through connecting tubes to the horizontal convection pass (rear wall) outlet header and then to the primary superheater (PSH) supplies.

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#BoilerManual #FluidCirculation #Section2 #Page31

From the convection pass floor inlet header, tubes extend into the furnace 9 feet at a 5 degree angle and bend back at a 35 degree angle to form the furnace arch (nose). Continuing on, this same circuit levels off and forms the pendant convection pass floor below the secondary superheater and outlet loop of the reheater. Finally, the path leads to the front wall convection pass intermediate header, which in turn supplies the front wall convection pass screen tubes up to the screen outlet header.

The second area supplied by the convection pass supply downcomer is the pendant convection pass side wall. From the side wall inlet headers, flow is straight up to the outlet headers in the penthouse. These sidewall tubes form the convection pass side wall enclosure.

Finally, the horizontal convection pass enclosure header is also supplied by the convection pass downcomer. As the name implies, the four enclosure walls are contained within this circuit. The front wall headers and tubes forms the lower CP front wall and flow into the intermediate header where they join the pendant CP floor tubes to supply the screen tubes. Discharge is through the screen outlet header.

The two side wall portions of the convection pass enclosure header rise above the reheater and PSH loops and continue on to and discharge into the upper side wall headers located in the penthouse.

The remaining horizontal convection pass enclosure circuit, the rear wall, travels directly up the convection pass rear wall outlet header located in the back end of the penthouse. At this point all convection pass circuits, pendant and horizontal, are lead from outlet headers through connecting tubes to the horizontal convection pass (rear wall) outlet header and then to the primary superheater (PSH) supplies.

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