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#BoilerManual #Ramping #Section8 #Page23

8. In this graph the 207 and 202 valves are closing. Why?

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Alt = The top chart on this page is addressed by question 7 on the previous page and the lines is identical to chart 6A of Fig. 6 on page 13 but with all but the line identification markings removed.
The lower chart associated with question 8 on this page is identical to chart 6C of Fig. 6 on page 13, complete with labels.

#BoilerManual #Ramping #Section8 #Page23

8. In this graph the 207 and 202 valves are closing. Why?

------------------------------------------------- 23 ------------------------------------------------------
Alt = The top chart on this page is addressed by question 7 on the previous page and the lines is identical to chart 6A of Fig. 6 on page 13 but with all but the line identification markings removed.
The lower chart associated with question 8 on this page is identical to chart 6C of Fig. 6 on page 13, complete with labels.

#BoilerManual #BypassSystem #Section7 #Page23

6. Startup can begin only when feedwater iron content is under 100 parts per billion (ppb).

7. In the startup phase, staem is sent to the deaerator for pressurization, and to the high pressure heaters for heat recovery. SSteam was also admitted to the secondary superheater and turbine. By the end of startup, all boiler components have steam flowing through them.

8. Ramping is the fourth and final stage of boiler startup. During the ramping stage, pressure, temperature and flow of the steam is brought up to 33% load. Once ramping is complete, the unit no longer needs the bypass system.

9. If iron content is low enough after cold cleanup, then hot cleanup is unnecessary. Feedwater iron content must be below 100 parts per billion (ppb) before startup is begun.

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#BoilerManual #BypassSystem #Section7 #Page23

6. Startup can begin only when feedwater iron content is under 100 parts per billion (ppb).

7. In the startup phase, staem is sent to the deaerator for pressurization, and to the high pressure heaters for heat recovery. SSteam was also admitted to the secondary superheater and turbine. By the end of startup, all boiler components have steam flowing through them.

8. Ramping is the fourth and final stage of boiler startup. During the ramping stage, pressure, temperature and flow of the steam is brought up to 33% load. Once ramping is complete, the unit no longer needs the bypass system.

9. If iron content is low enough after cold cleanup, then hot cleanup is unnecessary. Feedwater iron content must be below 100 parts per billion (ppb) before startup is begun.

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#BoilerManual #CycloneOperation #Section6 #Page23

5. When the cyclone start button is pushed the control system will check to see that all boiler, lighter and cyclone permissives have been met. Next the feeder outlet valve opens and the feeder is started. The secondary air control damper will move to its firing position. The shutoff damper will be fully open. Once windbox temperature exceeds 300 F the primary-tertiary air damper will go fully open. With a main flame detected the cyclone is successfully lit.

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#BoilerManual #CycloneOperation #Section6 #Page23

5. When the cyclone start button is pushed the control system will check to see that all boiler, lighter and cyclone permissives have been met. Next the feeder outlet valve opens and the feeder is started. The secondary air control damper will move to its firing position. The shutoff damper will be fully open. Once windbox temperature exceeds 300 F the primary-tertiary air damper will go fully open. With a main flame detected the cyclone is successfully lit.

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#BoilerManual #AirAndGasFlow #Section3 #Page23

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Alt = Labeled Fig. 17 at the bottom, with a title at the top: "TYPICAL" CALIBRATION CURVE"
It is a graph with the x axis incrementing by 50 from 0 to 500 marked Secondary air flow (1000 lb/hr); y axis has standard increments from 0 to 15 and is marked Bellmouth air flow differential (inches of water). Three curves are plotted from the 0 origin curving upward, the rightmost curve not going much beyond the 400 mark along the x axis, and this curve is marked 500 F. The middle curve is similar but closer to the 350 mark on the x axis, and is marked 600 F. The leftmost curve goes closer still to the 350 mark on the x axis and is marked 700 F.

#BoilerManual #AirAndGasFlow #Section3 #Page23

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Alt = Labeled Fig. 17 at the bottom, with a title at the top: "TYPICAL" CALIBRATION CURVE"
It is a graph with the x axis incrementing by 50 from 0 to 500 marked Secondary air flow (1000 lb/hr); y axis has standard increments from 0 to 15 and is marked Bellmouth air flow differential (inches of water). Three curves are plotted from the 0 origin curving upward, the rightmost curve not going much beyond the 400 mark along the x axis, and this curve is marked 500 F. The middle curve is similar but closer to the 350 mark on the x axis, and is marked 600 F. The leftmost curve goes closer still to the 350 mark on the x axis and is marked 700 F.

#BoilerManual #FluidCirculation #Section2 #Page23

At this point, let's discuss separately the front wall circuits of units 1 and 2. Unit 1 has two front wall passes with one mix bottle. Flow from the first pass mix bottle enters the second pass circuit and finally discharges into the front wall header located in the penthouse (Figure 21). Unit 2 has three front wall passes with two mix bottles. Flow from the first pass mix bottle is subsequently through the second pass front wall tubes and mix bottle to the third pass wall tubes and discharges to the front wall header located in the penthouse.

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Alt = Labeled Fig. 19 Cyclone discharge -- furnace supply. Simple depiction of a cross section of the firebox part of the furnace with Cyclone discharge lines pointed out using arrows in the midsection of the drawing from both of the sides of the furnace toward the middle then pointing down the middle to what's marked as Furnace inlet headers. To either side of the central firebox, symmetrically depicted, are 2 cyclone barrels, one above the other; on the left side set of cyclones, the top one is labeled B Path with an arrow pointing rightward and the lower cyclone labeled A Path with another arrow pointing rightward. On the right side are their counterpart cyclones with the top right cyclone labeled A Path with an arrow pointing leftward and the lower cyclone labeled B Path with an arrow pointing leftward.

#BoilerManual #FluidCirculation #Section2 #Page23

At this point, let's discuss separately the front wall circuits of units 1 and 2. Unit 1 has two front wall passes with one mix bottle. Flow from the first pass mix bottle enters the second pass circuit and finally discharges into the front wall header located in the penthouse (Figure 21). Unit 2 has three front wall passes with two mix bottles. Flow from the first pass mix bottle is subsequently through the second pass front wall tubes and mix bottle to the third pass wall tubes and discharges to the front wall header located in the penthouse.

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Alt = Labeled Fig. 19 Cyclone discharge -- furnace supply. Simple depiction of a cross section of the firebox part of the furnace with Cyclone discharge lines pointed out using arrows in the midsection of the drawing from both of the sides of the furnace toward the middle then pointing down the middle to what's marked as Furnace inlet headers. To either side of the central firebox, symmetrically depicted, are 2 cyclone barrels, one above the other; on the left side set of cyclones, the top one is labeled B Path with an arrow pointing rightward and the lower cyclone labeled A Path with another arrow pointing rightward. On the right side are their counterpart cyclones with the top right cyclone labeled A Path with an arrow pointing leftward and the lower cyclone labeled B Path with an arrow pointing leftward.