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#BoilerManual #AirAndGasFlow #Section3 #Page38

Reheat Spray Attemperator (1)

The reheat spray attemperator functions in the same manner as the superheater sprays. The reheat spray attemperator is located in the cold reheat line between the high pressure turbine exhaust and the reheat inlet header. Spray flow to the reheat attemperator is taken off a bleed point on the boiler feed pumps.

The design curves associated with the reheat spray attemperator are illustrated in Figure 33. Notice that throughout the load range, there is no expected spray flow. Of course, this is based upon proper gas recirculation flows and normal operating conditions.

We have now discussed how the combustion air is brought to the cyclones and how the combustion gases are made to flow through the furnace, convection pass, air heaters, fans and stacks. We have also examined methods of steam temperature control with the use of gas recirculation and spray attemperation. The more detailed effects of gas recirculation were related to heat absorption patterns throughout the unit.

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#BoilerManual #AirAndGasFlow #Section3 #Page38

Reheat Spray Attemperator (1)

The reheat spray attemperator functions in the same manner as the superheater sprays. The reheat spray attemperator is located in the cold reheat line between the high pressure turbine exhaust and the reheat inlet header. Spray flow to the reheat attemperator is taken off a bleed point on the boiler feed pumps.

The design curves associated with the reheat spray attemperator are illustrated in Figure 33. Notice that throughout the load range, there is no expected spray flow. Of course, this is based upon proper gas recirculation flows and normal operating conditions.

We have now discussed how the combustion air is brought to the cyclones and how the combustion gases are made to flow through the furnace, convection pass, air heaters, fans and stacks. We have also examined methods of steam temperature control with the use of gas recirculation and spray attemperation. The more detailed effects of gas recirculation were related to heat absorption patterns throughout the unit.

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#BoilerManual #FluidCirculation #Section2 #Page38

Questions for fluid circulation

1. To which of the following water/steam stages can you apply heat without a rise in temperature occurring?
.....A. water up to its saturation point
.....B. saturation point to saturated steam
.....C. saturated steam to superheater steam
.....D. none of the above.

2. What term is used when water and steam reach 3206 psi?

3. True or false.
.....The need to match fluid flow and firing rate is necessary only at
.....high load levels.

4. What should the minimum flow in the furnace circuits be before a UP boiler is fired?

5. How can you control internal corrosion on economizer tubes?

6. Name the seven fluid flow paths within each cyclone.

7. What are the two (2) main purposes of the mix system?

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#BoilerManual #FluidCirculation #Section2 #Page38

Questions for fluid circulation

1. To which of the following water/steam stages can you apply heat without a rise in temperature occurring?
.....A. water up to its saturation point
.....B. saturation point to saturated steam
.....C. saturated steam to superheater steam
.....D. none of the above.

2. What term is used when water and steam reach 3206 psi?

3. True or false.
.....The need to match fluid flow and firing rate is necessary only at
.....high load levels.

4. What should the minimum flow in the furnace circuits be before a UP boiler is fired?

5. How can you control internal corrosion on economizer tubes?

6. Name the seven fluid flow paths within each cyclone.

7. What are the two (2) main purposes of the mix system?

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