FLUE GAS FUNCTIONAL SPECIFICATION
Power Plant
: P17_180
Document Number
: SS04/MTHZAM022
Revision
: A
Flue Gas System Specification
MTHZAM022 ZAMANI MTHEMBU
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DOCUMENT AUTHOR
Student Number
Full name
MTHZAM022
ZAMANI MTHEMBU
Doc. No.: SS04/MTHZAMO22
Revision: A
Page 2 of 14
Flue Gas System Specification
MTHZAM022 ZAMANI MTHEMBU
Contents
i. ABBREVIATIONS, DEFINITIONS AND ACRONYMS .......................................................................................3
ii. SCOPE ...............................................................................................................................................................4
iii. APPLICABLE DOCUMENTS .............................................................................................................................4
iv. RELATED DOCUMENTS ...................................................................................................................................4
1. SYSTEM DEFINITION .......................................................................................................................................5
1.1 PRIME ITEM DIAGRAM ...............................................................................................................................6
1.2 FUNCTIONAL ALLOCATION .......................................................................................................................7
1.3 INTERFACES ...............................................................................................................................................7
2. PRIMARY EQUIPMENT REQUIREMENTS .......................................................................................................8
2.1 FABRIC FILTER PLANT ..............................................................................................................................8
2.1.1 FUNCTIONAL CHARACTERISTICS ....................................................................................................8
2.1.2 PHYSICAL CHARACTERISTICS ..........................................................................................................9
2.2 FLUE GAS CONDENSER ............................................................................................................................9
2.2.1 FUNCTIONAL CHARACTERISTICS ....................................................................................................9
2.2.2 PHYSICAL CHARACTERISTICS ........................................................................................................10
3. GENERAL REQUIREMENTS ..........................................................................................................................13
3.1 OPERATIONAL REQUIREMENTS ............................................................................................................13
3.2 RELIABILITY, AVAILABILITY, MAINTAINABILITY ....................................................................................13
3.3 CONSTRAINTS AND STANDARDS ..........................................................................................................13
i.
ABBREVIATIONS, DEFINITIONS AND ACRONYMS
Abbreviations and Acronyms
Abbreviation or
Acronym
Explanation / Definition
ID fan
Induced draft fan
URS
User Requirement Specification
FFP
Fabric Filter Plant
EXT
External system
SS
Subsystem
Doc. No.: SS04/MTHZAMO22
Revision: A
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Flue Gas System Specification
MTHZAM022 ZAMANI MTHEMBU
ii.
SCOPE
URS
FLUE GAS
SUBSYSTEM
ANALYSIS
SUBSYSTEM
ANALYSIS
DOCUMENTS
.
iii.
APPLICABLE DOCUMENTS
Document Title
[1]
iv.
Revision /
Date
Number
URS
URS4108
1.2
RELATED DOCUMENTS
Document Title
[2]
Number
Flue gas subsystem analysis
Doc. No.: SS04/MTHZAMO22
NP0150
Revision: A
Revision /
Date
B
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Flue Gas System Specification
MTHZAM022 ZAMANI MTHEMBU
1.
SYSTEM DEFINITION
The flue gas subsystem consists of the baghouse, flue gas condenser, induced draft fan, and
smokestack. The Baghouse, also known as the Fabric Filter Plant (FFP), is a big box packed with
vertically suspended fabric filter bags. The system uses a type of condenser often used to extract the
moisture from the hot flue gas which is called a direct tubular scrubbing heat exchanger. The Baghouse
has long cloth filter bags that collect fly ash/dust. This ash is then thrown into bottom hoppers. As the
dust accumulates on the bag surfaces, the pressure drops across every bag increase. If the dust is not
removed from the bag, no flow travels past it. The dust is dislodged using an off-line pulse-jet operation.
At periodic intervals, this operation generates a high-pressure air surge at the bag's output. As a result,
to avoid dust from being retrieved, the baghouse is separated into many compartments, and every
compartment is separated enough from the flue gas stream preceding cleaning. To enable the
compressed air unit to refill tanks of air, it requires a 10-minute gap among cleaning neighbouring
compartments. The moisture in the flue gas is condensed by the flue gas condenser. This is a
significant amount of heat, which is subsequently used in manufacturing for minimal heating. To
guarantee that the furnace is at the proper relative pressure, the ID fan overrides any pressure
decreases within the system, along with those in the back-pass. The stack is large enough to expel
any residual contaminants into the atmosphere.
Doc. No.: SS04/MTHZAMO22
Revision: A
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Flue Gas System Specification
MTHZAM022 ZAMANI MTHEMBU
1.1
PRIME ITEM DIAGRAM
Doc. No.: SS04/MTHZAMO22
Revision: A
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Flue Gas System Specification
MTHZAM022 ZAMANI MTHEMBU
1.2
FUNCTIONAL ALLOCATION
1.3
INTERFACES
Number
Description
Reference
SS02-SS04
Interface between air supply and flue gas subsystem
SS02SS04/MTHZAM022
SS07-SS04
Interface between electrical generation and flue gas
subsystem
TBD
EXT02-P17_180
Interface between the atmosphere and power plant
TBD
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Flue Gas System Specification
MTHZAM022 ZAMANI MTHEMBU
PRIMARY EQUIPMENT REQUIREMENTS
FUNCTIONAL CHARACTERISTICS
Function
Metric
Value
Rationale / Design
Parameters
Trace
MoC
2.1.1
FABRIC FILTER PLANT
Status
2.1
Priority
2.
MoC description
URS4108
par 3.1
H V
T
Place an anemometer on the bag surface and
record the velocity of the flue gas.
H V
Using a metrestick, measure the surface area
T of the filter bags and confirm that none of
the bags are ruptured.
FN6.2.1 Filter plant face velocity
0.25 m/s ± 0.01 m/s
To ensure flue gas flows
through all 938 bag
surfaces as per the
NP0150 rev B
FN6.2.2 Baghouse surface area
25 m^2 ± 0.5 m^2
To ensure that the dust
has been removed off the
bag
URS4018
par 3.3
100 kPa ± 0.5 kPa
To ensure that dust stops
accumulating
URS4108
par 3.1
H V
To measure the pressure, use a manometer.
Insert the end of the manometer hose
T
underneath the compartments and connect
the other end to the manometer
1 kg ± 0.02 kg
This is the dust mass
accumulated before the
second cycle starts. To
keep the discharged dust
from being entrained
URS4108
par 3.1
H V
Measure the amount of dust dislodged in each
T compartment using a dust measuring device
PCE-MPC 20
Pressure drop inside the
FN6.2.3
baghouse
FN6.2.4 Dust mass
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Revision: A
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Flue Gas System Specification
MTHZAM022 ZAMANI MTHEMBU
2.2.1
Function
To guarantee that all
938 bags of the filter
plant fit
URS4108
par 3.3
H V
T
Trace
MoC description
Use a tape measure to measure the total
baghouse length
FLUE GAS CONDENSER
FUNCTIONAL CHARACTERISTICS
Metric
Value
RQ2. Drains mass flow rate
7.5 kg/s ± 0.02 kg/s
Doc. No.: SS04/MTHZAMO22
Rationale / Design
Parameters
To ensure that the flue
gas mass flow via the
URS4108
ID fan and stack is
par 3.1
reduced to 34 kg/s as
per NP0150 rev B
Revision: A
Status
2.2
48.5 m ± 0.1 m
Trace
MoC
RQ1. Baghouse length
Rationale / Design
Parameters
MoC
Value
Status
Metric
Priority
PHYSICAL CHARACTERISTICS
Priority
2.1.2
H V
MoC description
Use a pin-type moisture meter to measure the
drains mass flow by touching the meter pins
T
onto the surface of the modules in the
condenser
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Flue Gas System Specification
MTHZAM022 ZAMANI MTHEMBU
RQ3. Volume of the condenser
30 m^3 ± 0.5 m^3
Rationale / Design
Parameters
Trace
To ensure that all 10
modules achieve the heat
URS4108
transfer ability of
par 3.1
150kw/K as per NP0150
rev B
MoC
Value
Status
Metric
Priority
PHYSICAL CHARACTERISTICS
MoC description
H E
Use a planimeter to first measure the
distance from where the flue gas exits the
condenser to where the liquid is scrubbed
T
out. Then, measure the distance from where
the flue gas enters the condenser to the
district heating out.
Priority
2.2.2
2.3. INDUCED DRAFT FAN
Metric
FN1.4 RQ4. Inlet absolute pressure
.4
FN6.1
Rationale / Design
Parameters
Trace
99.50 kPa ± 0.1 kPa
To keep the pressure
within the furnace before
the superheater at 30 Pa
lower than the
atmospheric pressure at
all times.
URS4108
par 3.1
3.50 kg/s ± 0.02 kg/s
To ensure that the ID fan
achieves the required
power consumption of
220kW/k as per NP0150
Value
RQ5. Pressure rise over ID fan
Doc. No.: SS04/MTHZAMO22
Revision: A
URS4108
par 3.1
MoC
Function
Status
2.3.1. FUNCTIONAL CHARACTERISTICS
MoC description
H V
T
Use a Bourdon pressure gauge to measure
the pressure at the furnace
H V
Measure the absolute pressure at the inlet
and outlet using a manometer. Drill test ports
close to the ID fan between the fan and the
T
turning vane to ensure exact measurement of
the ID fan's operating inlet and outlet
discharging pressures.
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Flue Gas System Specification
MTHZAM022 ZAMANI MTHEMBU
1 m ± 0.1 m
MoC
Rationale / Design
Parameters
Trace
To ensure that 10 units as
per NP0150 rev B transfer
the required amount of
heat of 220 kW
URS4108
par 3.1
M E
Extend the tape measure to the opposite
T ends of the fan and measure the distance
from one blade tip to the other
Rationale / Design
Parameters
Trace
MoC
RQ6. Length of the ID fan
Status
Value
Priority
Metric
Priority
2.3.2. PHYSICAL REQUIREMENTS
MoC description
2.4. SMOKESTACK
Function
Metric
Value
FN6.4 RQ7. Flue gas volume flow
35 kg/s ± 0.5 kg/s
Doc. No.: SS04/MTHZAMO22
To ensure that the
condenser captures 34 kg/s URS4108
of SO2 as per NP0150 rev par 3.1
B
Revision: A
Status
2.4.1. FUNCTIONAL REQUIREMENTS
H V D
MoC description
Using an orifice meter, measure the volume
flow of flue gas as it exits the condenser.
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Flue Gas System Specification
MTHZAM022 ZAMANI MTHEMBU
RQ8. Stack height
48.5 m ± 0.1 m
Doc. No.: SS04/MTHZAMO22
Rationale / Design Parameters
Trace
To ensure that the flue gas is
ejected at an appropriate height
to limit local pollution.
URS4108
par 3.3
Revision: A
MoC
Value
Status
Metric
Priority
2.4.2. PHYSICAL REQUIREMENTS
H V U
MoC description
Use a tape measure to measure the stack
height
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Flue Gas System Specification
MTHZAM022 ZAMANI MTHEMBU
3.
3.1
GENERAL REQUIREMENTS
OPERATIONAL REQUIREMENTS
RQ9. The flue gas shall be cooled down to a temperature of 25 ℃ ± 0.1℃ by the condenser
Rationale: To eliminate elevation and buoyancy effects
Trace: URS4108 par 3.1; Priority: H; Status: V;
MoC: Use a pyrometer to measure samples of the flue gas
RQ10. The fluidizing velocity inside the furnace shall be 0.5m/s ± 0.01m/s
Rationale: To ensure that no bed sand is transported along with the flue gas
Trace: URS4108 par 3.1; Priority: H; Status: E;
MoC: Use a flow meter to measure the sand velocity inside the bed
3.2
RELIABILITY, AVAILABILITY, MAINTAINABILITY
RQ11. The distance between adjacent bags shall be 0.2 m
Rationale: To ensure that the 10-minute cleaning period is achieved
Trace: URS; Priority: H; Status: V;
MoC: Use a meterstick to measure the distance between bags
RQ12. Each compartment shall have 0.2 kg ± 0.01 kg of ash remaining after being cleaned
Rationale: To ensure that ash accumulates onto all the bags to limit air pollution
Trace: URS4108 par 3.3 ; Priority: H; Status: V;
MoC: Use a PCE-MPC 20 to measure the amount of ash in every cleaned compartment
3.3
CONSTRAINTS AND STANDARDS
RQ13. Flue gas exit velocity at the smokestack shall be at least 25 m/s
Rationale: To ensure that the flue gas is discharged at a height of 48.5m as per NP0150 rev B to prevent air pollution
Trace: URS4108 rev 1.2 par 3.3; Priority: H; Status: U;
MoC: Measure the flue gas velocity with an anemometer
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Flue Gas System Specification
MTHZAM022 ZAMANI MTHEMBU
RQ14. Each filter bag shall have a diameter of 150mm
Rationale: To ensure that the 0.025m/s of flue gas velocity as per NP0150 rev B is the same through all bag surfaces
Trace: URS4108 rev 1.2 par 3.3; Priority: H; Status: V;
MoC: Use a metrestick to measure the bag diameter
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Revision: A
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