085

Power output = mrjT _diaeal_ = (40,000 Ibm/h x 0.50)-= 1,517hp

Net thermal output to process = m (hd - ha)acuir = 40,000 lbm/h (1,284 - 180) Btu/lbm = 44,160 MBtu/h

Example 6 - Pressure Reducing Valve (Figure 11-52) vs. Back-Pressure Turbine (Figure 11-53)

A. Boiler and PRV Operation

Net input to process = m (hc - ha) = 40,000 lbm/h (1,380 - 180) Btu/lbm 48,000 MBtu/h

Input to boiler = m (h — hb) = 40,000 lbrn/h (h380 — 170) Btu/lbm = 56,941 MBtu/h Vb 0.85

Fuel

56,941 MBtu/h

Fuel

Useful Heat To Process Qp = 48,000 MBtu/h

56,941 MBtu/h

Useful Heat To Process Qp = 48,000 MBtu/h ha = 180 Btu/lbm

Fuel

QB-t 61,892 MBtu/h

Fuel

1,649 HP

Useful Heat To Process Qp = 48,000 MBtu/h

Fig. 11-52 PRV Operation.

Fig. 11-53 Back-Pressure Turbine Operation vs. PRV.

B. Back-Pressure Steam Turbine Operation

Net input to process with PRV 48,000 MBtu/h

Power output = m h - hd)actual = 4^ mh 96.5 Btu/lbm = lM9 hp

2,545 Btu/hp-h

2,545 Btu/hp-h

(hc - hb) . . ,, „ (1,380 -170) Btu/lbm ^,, Input to boiler = m—-—= 43,478 lbm/h ^-- = 61,892 MBtu/h hB

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