All the nearby buildings' heating is provided by saturated steam generated at a nearby steam plant using natural gas boilers. On March 13th, 2019 (cycle weather bomb), the area experienced a cold front with outdoor air temperature equal to 39°F at 9 am. After heating all buildings in the area, water returns to the boiler as saturated liquid at 222°F. Water is then preheated and pressurized to 222°F and 180 psig (state before entering the boiler).Water leaves the boiler as saturated vapor at 322°F. For this date/time steam mass flow rate was 21,900 lbm/hr.Boiler combustion produces combustion gases at 3,000°F at 20psia, which leaves the boiler at 400°F 19.5psia. Determine:The pressure of the steam leaving the boiler and the oiler heat capacity (heat needed to produce steam at the given flowrate and temperature, MMBtu/h)Mass air flow rate (lbm/h) and he exergy destroyed (MMBtu/h) in the boilerSecond law efficiency in the boilerAssumptions:Steady operating conditions exist and Kinetic and potential energy changes are negligible.Combustion gases are assumed to be air and modeled as an ideal gas (you cannot use Cp or Cv).You cannot assume pressure remains constant in the boiler.The image below depicts a simplified model of the system, as well as an actual picture of the boiler at the time of this problem. Fresh Air DampeCombustionWTime sinceFR40.7%.PV746 PSSP 75.0 PGICV406%DamperstencerBPM Const40.6%kaderStack Damper100GegenManuPressDMS InteWarmup ControlEnable OffOran LevePIT350WindboxBOILER #1 (BUZZ) OVERVIEWCA200EconomizerB-1 BUZZGASWater180 psia222°FDrum40.9Gas Vaof vave20.3%OAT: 39 FSTEAM HEADERFITFEEHEADER PVPVDONE FLOW 215 PDA LEVEL: 41.9Boter 1 Mun Hours: 201Gas Flow26.4 KachDE FLOWGPMER#SYSTEM IN MODE 69Sat Steam322°F

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Answered: All the nearby buildings' heating is…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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All the nearby buildings' heating is provided by saturated steam generated at a nearby steam plant using natural gas boilers. On March 13th, 2019 (cycle weather bomb), the area experienced a cold front with outdoor air temperature equal to 39°F at 9 am. After heating all buildings in the area, water returns to the boiler as saturated liquid at 222°F. Water is then preheated and pressurized to 222°F and 180 psig (state before entering the boiler).

Water leaves the boiler as saturated vapor at 322°F. For this date/time steam mass flow rate was 21,900 lbm/hr.
Boiler combustion produces combustion gases at 3,000°F at 20psia, which leaves the boiler at 400°F 19.5psia.
Determine:

The pressure of the steam leaving the boiler and the oiler heat capacity (heat needed to produce steam at the given flowrate and temperature, MMBtu/h)
Mass air flow rate (lbm/h) and he exergy destroyed (MMBtu/h) in the boiler
Second law efficiency in the boiler

Assumptions:

Steady operating conditions exist and Kinetic and potential energy changes are negligible.
Combustion gases are assumed to be air and modeled as an ideal gas (you cannot use Cp or Cv).
You cannot assume pressure remains constant in the boiler.

The image below depicts a simplified model of the system, as well as an actual picture of the boiler at the time of this problem.

Fresh Air Dampe
Combustion
W
Time since
FR
40.7%
.
PV746 PS
SP 75.0 PGI
CV406%
Damper
stencer
BPM Const
40.6%
kader
Stack Damper
100
Gegen
Manu
Press
DMS Inte
Warmup Control
Enable Off
Oran Leve
PIT
350
Windbox
BOILER #1 (BUZZ) OVERVIEW
CA
200
Economizer
B-1 BUZZ
GAS
Water
180 psia
222°F
Drum
40.9
Gas Va
of vave
20.3%
OAT: 39 F
STEAM HEADER
FIT
FEE
HEADER PVP
VDONE FLOW 215 P
DA LEVEL: 41.9
Boter 1 Mun Hours: 201
Gas Flow
26.4 Kach
DE FLOW
GPM
ER
#
SYSTEM IN MODE 6
9
Sat Steam
322°F

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