## 085

= Work output = 2,545 x 100% = 85% Net heat rate 2,994

Net thermal output to process = m (hd - ha)actuai = 20,000 lbm/h (1,129.0 - 180.0) Btu/lbm = 18,980 MBtu/h

Example 3 - Pressure Reducing Valve (Figure 11-48) vs. Back-Pressure Turbine (Figure 11-49)

A. Boiler and PRV Operation

Thermal output to process = m (hc - h) = 20,000 Ibm/h (1,201.7 - 180.0) Btu/lbm = 20,434 MBtu/h

Input to boiler = m h - hb) = 20,000 lbrn/h (1,201J- 1703 Btu/lbm = 24,268 MBtu/h F r]B 0.85

Pc = 250 psig Tc = 406°F hc = 1,201.7 Btu/lbm m = 21,532 lbm/h

Fuel QB 26,127 MBtu/h

Pc = 250 psig Tc = 406°F hc = 1,201.7 Btu/lbm m = 21,532 lbm/h

Fuel QB 26,127 MBtu/h

Usetul Heat To Process

Usetul Heat To Process

Fig. 11-48 PRV Operation.

B. Back-Pressure Steam Turbine Operation

Fig. 11-49 Back-Pressure Turbine Operation vs. PRV.

Net steam input required =

Net input to process with PRV 20,434 MBtu/h

Power output = m (hc - hd)actual- = 21,532 lbrn/h x_727 ^ = 615 hp

2,545 Btu/hp-h

2,545 Btu/hp-h

, ■ , • (hc — hb) 1Ifri„ ,, (1,201.7 —170.3) Btu/lbm ,, Input to boiler = m -— = 21,532 lbm/h ^---—-- = 26,127MBtu/h hB

## Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

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