#page33 — Public Fediverse posts

#BoilerManual #AirAndGasFlow #Section3 #Page33

Flue gas tempering and recirculation are used from initial firing through initial turbine loading in order to obtain maximum furnace absorption with minimal gas temperature entering the convection pass. Flue gas temperatures leaving the furnace and entering the secondary superheater must be limited to 1000 F until 10% of full load steam flow is passing through the superheater. As stated before, this is to insure that a proper cooling flow exists in the superheater in order to prevent overheat tube failures. Gas recirculation requirements over the entire load range is illustrated in Figure 29.

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Alt = Labeled Fig. 28 Effect of gas tempering on heat-absorption pattern at a constant firing rate. Image of a sectioned-off graph where the x axis is in terms of Change in heat absorption-- % and increments every 5 but marked in only 10s. The lower section of the y axis is in terms of Change in heat absorption -- % but point of origin starts at -40. It increases incrementally every 10 but only the 20 lines are marked, and there's a miniature drawing, a rendering of a furnace with 4 arrows pointing inward toward it between the lines for +40. There's an arrow pointing away from the area marked Econ at the line for 1800 of the upper graph segment, marked to AH. superheater/reheat areas are also marked on the drawing. The upper graph segment is marked in terms of Gas Temp. - F from 1800 to 2400 at every 2000 increment although increments are every 1000. it shows a sagging curve from the 2400 point at 0y, declining to just over 1800 at the point of 60y.

The lower segment displays one curve each for, in top down order, Economizer, Primary Superheater, Reheater, Furnace and Secondary superheater.

#BoilerManual #AirAndGasFlow #Section3 #Page33

Flue gas tempering and recirculation are used from initial firing through initial turbine loading in order to obtain maximum furnace absorption with minimal gas temperature entering the convection pass. Flue gas temperatures leaving the furnace and entering the secondary superheater must be limited to 1000 F until 10% of full load steam flow is passing through the superheater. As stated before, this is to insure that a proper cooling flow exists in the superheater in order to prevent overheat tube failures. Gas recirculation requirements over the entire load range is illustrated in Figure 29.

------------------------------------------------- 33 ------------------------------------------------------
Alt = Labeled Fig. 28 Effect of gas tempering on heat-absorption pattern at a constant firing rate. Image of a sectioned-off graph where the x axis is in terms of Change in heat absorption-- % and increments every 5 but marked in only 10s. The lower section of the y axis is in terms of Change in heat absorption -- % but point of origin starts at -40. It increases incrementally every 10 but only the 20 lines are marked, and there's a miniature drawing, a rendering of a furnace with 4 arrows pointing inward toward it between the lines for +40. There's an arrow pointing away from the area marked Econ at the line for 1800 of the upper graph segment, marked to AH. superheater/reheat areas are also marked on the drawing. The upper graph segment is marked in terms of Gas Temp. - F from 1800 to 2400 at every 2000 increment although increments are every 1000. it shows a sagging curve from the 2400 point at 0y, declining to just over 1800 at the point of 60y.

The lower segment displays one curve each for, in top down order, Economizer, Primary Superheater, Reheater, Furnace and Secondary superheater.

#BoilerManual #FluidCirculation #Section2 #Page33

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Alt = Labeled Figure 25 Headers and piping (top view in the penthouse). This full page image is on its side with the bottom on the right of the page and the top on the left. On the right of a plumbing depiction is a numbered list of labels 1 thru 10 but entirely too complex to be within the scope of verbal description of where they're located. The list:
1. Roof outlet
2. PSH supply
3. PSH outlet
4. PSH crossover lines
5. SSH inlet
6. SSH outlet
7. Main steam lines
8. Reheat outlet
9. Reheat steam lines
10. Economizer outlet

#BoilerManual #FluidCirculation #Section2 #Page33

------------------------------------------------- 33 ------------------------------------------------------
Alt = Labeled Figure 25 Headers and piping (top view in the penthouse). This full page image is on its side with the bottom on the right of the page and the top on the left. On the right of a plumbing depiction is a numbered list of labels 1 thru 10 but entirely too complex to be within the scope of verbal description of where they're located. The list:
1. Roof outlet
2. PSH supply
3. PSH outlet
4. PSH crossover lines
5. SSH inlet
6. SSH outlet
7. Main steam lines
8. Reheat outlet
9. Reheat steam lines
10. Economizer outlet

@Monika The first with the boy is from #Page33

@Monika The first with the boy is from #Page33