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COAL HANDLING SYSTEM CHHABRA THERMAL POWER PROJECT STAGE-I, PHASE-II, 2X250 MW
RAJASTHAN RAJYA VIDYUT UTPADAN NIGAM LTD., RAJASTHAN
CHHABRA THERMAL POWER PROJECT STAGE –I, PHASE-II, 2 X 250 MW UNIT # 3&4
DESIGN BASIS REPORT OF VENTILATION SYSTEMS FOR W.T.3 COMPLEX, TUNNEL OF CONVEYOR BCN-1(2) & TH-1(2)
Job No.
OWNER
RAJASTHAN RAJYA VIDYUT UTPADAN NIGAM LTD., RAJASTHAN
OWNER’S CONSULTANT
TCE CONSULTING ENGINEERS LIMITED, BANGALORE
EPC AGENCY
THE INDURE PVT LTD,”INDURE HOUSE”, NEW DELHI
SYSTEM SUPPLIER
WRC ENGINEERING CO. PVT. LTD., V.U.NAGAR, GUJARAT
I-3062
Name Prepared By
J.P. PATEL
Date 18.01.2012
P.M. PATEL
20.01.2012
Checked By Approved By Document No. Rev. No. 1. 2.
I-3062-VS-DBR-1022
Record of Revisions Particulars Date Revised Based on TCE Comments Ref No.: 19.05.2012 TCE.5225A/ME/AV/811-107 dated 11.04.2012 Revised Based on TCE Comments Ref No.: 20.03.2012 TCE.5225A/ME/AV/811-115 dated 28.09.2012
VNT-01-R2
Rev No. 2
Checked By
Approved By
PM
PM
AP
PM
COAL HANDLING SYSTEM CHHABRA THERMAL POWER PROJECT STAGE-I, PHASE-II, 2X250 MW
TABLE OF CONTENTS Sr. No. 01.0 02.0 03.0 04.0 05.0 06.0 07.0 08.0 09.0 10.0 11.0 11.1 11.2 12.0 13.0 14.0 15.0
Description Introduction General Description of Ventilation System Standard & Code Layout Design Criteria Friction loss calculation Selection of Fan (Supply & Exhaust) Equipment Summery Schematic (SLD) Supply Air System Schematic (SLD) Exhaust Air System General Arrangement Drawing of Fan with MOC Attachments: Supply Air C.F. Fan Exhaust Air C.F. Fan General Arrangement Drawing of Air Intake Louver with Filter Frame General Arrangement Drawing of Supply Air Filter General Arrangement Drawing of Supply Air Grill General Arrangement Drawing of Exhaust Air Grill
VNT-01-R2
Page No. 02 02 02 02 02 05 06 07 09 10 11
Page 1 of 8
COAL HANDLING SYSTEM CHHABRA THERMAL POWER PROJECT STAGE-I, PHASE-II, 2X250 MW
01.0
Introduction. This document covers description of Ventilation System, equipment sizing, design philosophy for various components of Ventilation System and design philosophy for the control and operation 0f Ventilation System for 2 x 250 MW, Units # 3 & 4 (Stage-I, Phase-II) of Chhabra Thermal Power Station.
02.0
General Description of Ventilation System. Ventilation System is comprised of Supply Air System and Exhaust Air System. Supply Air System consists of Air Filters, Centrifugal Supply Air fan with Outlet flexible connection Vibration isolation Pad and foundation bolts, Inlet Air Louver, Ducting with Supply Air Grills. Exhaust Air System consists of Centrifugal Exhaust Air Fan with Inlet flexible connection, Vibration isolation Pad and foundation bolts, Ducting with Exhaust Air Grills. R2
03.0
Standard and Codes. The applicable standards and codes for various major equipment of Ventilation System are as given below. 1. 2. 3. 4.
04.0
IS:655 IS:4894 IS:3588 IS:277
Specification for Metal Air Duct Centrifugal Fan Specification for electric Axial Fan Specification of GI Sheet
R1
Layout. Ventilation System for Wagon Tippler-3 Building and Tunnel of Conveyor BCN-1(2) is located at TH-1 building.
05.0
Design Criteria. 05.1
Design Ambient Condition.
05.2
The following ambient conditions given in Project Information of NIT would be considered for sizing of Supply and Exhaust Fan. Design ambient temperature Design relative humidity Site elevation
05.3 •
• VNT-01-R2
: : :
0
46.3 C 20% to 80% 400 M above MSL
R1
Design requirements.
As stated in technical specification for Ventilation system, suitable ventilation system is provided for underground portion of Wagon Tippler-3 Building along with Tunnel of Conveyor BCN-1(2) and Part of TH-1(2). Fresh and Filtered air is brought in to under-ground portion of Wagon Tippler Building. Page 2 of 8
COAL HANDLING SYSTEM CHHABRA THERMAL POWER PROJECT STAGE-I, PHASE-II, 2X250 MW
• •
• • • •
12 air changes are considered for supply air system. A set of filters are provided before intake Centrifugal Fan. C.F. Fan will deliver required air in to GI Sheet Duct and there-after it will be distributed in to Wagon Tippler Building through supply air grills located at specific locations. Suitable quantity of supply air grills are considered at regular intervals. We have considered exhaust air volume as 90 % of supply air volume.R2 Suitable quantity of Exhaust air grills are considered at regular intervals. Air velocity considered for design will be less than 10 m/sec in Supply & Exhaust GI Ducting.
05.4
Supply and Exhaust Air Capacity.
Volume of Ventilated area for Supply and Exhaust air is calculated as below:
1. 2. 3. 4. 5. 6.
W.T.-3 Complex Area Elevation at -13.200 floor Elevation at -13.200 floor Elevation at -17.900 floor Tunnel of Conveyor BCN-1(2) Transfer Tower TH-1(2) Floor elevation -5.115 Floor elevation -8.315
Length meter
Width meter
Height meter
Volume m3
16.80 12.15 14.15 65.00
8.70 11.50 11.50 3.80
5.50 5.50 4.40 3.00
803.880 768.487 715.990 741.000
13.80 13.80
10 10
8.32 2.90
Total Volume (V) = VSA+VSB+VSC+VSD+VSE+VSF
-VSA -VSB -VSC -VSD
1148.160 -VSE 400.200 -VSF 4577.717
We are considering 12 air changes per hour for Supply air system = 4577.717 x 12 = 54932.604 m3/hr. We have considered Supply Air Ventilation System of 55000 m3/hr.
VS-01
We are considering Exhaust air system as 90 % of Supply air volume R2 = 55000 x 90 % = 49500 m3/hr. We have considered Exhaust Air Ventilation System of 49500 m3/hr. R2 05.5
VE-01
Selection of Supply Air Filters. We have considered HDPE washable type air filters with filtering efficiency of 95% down to 5 microns for Supply Air Ventilation System. We have selected standard air ‘W’ fold type air filters suitable to fit 610x610 mm size with filter cloth area of 0.5 m2 each filter. (Please refer G.A. Drawing for cloth area) We have considered air velocity of 1.8 m/sec at filter inlet. Considering Supply Air System capacity of 55000 m3/hr. and velocity of air entering filters as 1.8 m/sec., calculated cloth area will be ((55000/3600)/1.8)= 8.49 m2.
VNT-01-R2
Page 3 of 8
COAL HANDLING SYSTEM CHHABRA THERMAL POWER PROJECT STAGE-I, PHASE-II, 2X250 MW
Considering unit air filter cloth area as 0.5 m2, calculated total numbers of filter are (8.49/0.5)=16.98 numbers. We have selected 20 (5x4) numbers of supply air filters for Supply Air Ventilation system. 05.6
Selection of Supply & Exhaust Air Ducting & Grills. We have considered duct air velocity of 10 m/sec. for supply & exhaust air ducting. We have considered grill air velocity of 4 m/sec. for supply & exhaust air grills. We have considered grill spacing of maximum 5 meter distance. We have considered duct at maximum 3 meter distance with / without tie rod as per civil requirements.
1) Based on calculation for individual space volume and considered air change for supply air, we have considered space volume for Supply Air Ventilation System as under: A. 13800 m3/hr B. 5000 m3/hr C. 17300 m3/hr D. 18900 m3/hr Sr. No.
Air Volume M3/hr
TH-1 (2) of Floor at Elevation -5.115 TH-1 (2) of Floor at Elevation -8.315 W.T.3 Hopper Area of Floor at Elevation -17.900 & Tunnel of Conveyor BCN-1(2) W.T.3 Hopper Area of Floor at Elevation -13.200 Duct Size Length mt
Width mt
Air Velocity m/sec
Number of Grill and Grill Size
A. Calculation for Duct Size and Grill for Supply Air VNT System for TH-1(2) of Floor at Elevation -5.115 01 13800 0.700 0.560 9.78 3 No. S.A. Grill 350 x 300 mm 02 9200 0.650 0.400 9.83 3 No. S.A. Grill 350 x 300 mm 3 No. S.A. Grill 350 x 300 mm 03 4600 0.400 0.350 9.13 B. Calculation for Duct Size and Grill for Supply Air VNT System for TH-1(2) of Floor at Elevation -8.315 5 No. S.A. Grill 300 x 250 mm 04 5000 0.400 0.350 9.92 C. Calculation for Duct Size and Grill for Supply Air VNT System for Tunnel of Conveyor BCN-1(2) up to W.T.-3 Complex 3 No. S.A. Grill 325 x 250 mm 06 36200 1.200 0.850 9.86 3 No. S.A. Grill 325 x 250 mm 07 32740 1.150 0.800 9.89 3 No. S.A. Grill 325 x 250 mm 08 29280 1.050 0.800 9.68 3 No. S.A. Grill 325 x 250 mm 09 25820 1.050 0.700 9.76 3 No. S.A. Grill 325 x 250 mm 10 22360 0.900 0.700 9.86 Note: For duct design volume of air for WT-3 Apron Feeder area é from this duct. D. Calculation for Duct Size and Grill for Supply Air Feeder Area 11 18900 0.800 0.700 9.38 12 13500 0.700 0.560 9.57 13 8100 0.525 0.450 9.52 VNT-01-R2
VNT System for W.T.-3 Complex Apron 4 No. S.A. Grill 325 x 300 mm 4 No. S.A. Grill 325 x 300 mm 6 No. S.A. Grill 325 x 300 mm Page 4 of 8
COAL HANDLING SYSTEM CHHABRA THERMAL POWER PROJECT STAGE-I, PHASE-II, 2X250 MW
2) Based on calculation for individual space volume and considered air change for exhaust air, we have considered space volume for Exhaust Air Ventilation System as under: R2 A. 12400 m3/hr B. 4300 m3/hr C. 15800 m3/hr D. 17000 m3/hr Sr. No.
Air Volume M3/hr
TH-1 (2) of Floor at Elevation -5.115 TH-1 (2) of Floor at Elevation -8.315 W.T.3 Hopper Area of Floor at Elevation -17.900 & Tunnel of Conveyor BCN-1(2) W.T.3 Hopper Area of Floor at Elevation -13.200 Duct Size Length mt
Width mt
Air Velocity m/sec
Number of Grill and Grill Size
A. Calculation for Duct Size and Grill for Exhaust Air VNT System for TH-1(2) of Floor at Elevation -5.115 01 12400 0.650 0.550 9.63 4 No. E.A. Grill 350 x 325 mm 02 6200 0.450 0.400 9.57 4 No. E.A. Grill 350 x 325 mm B. Calculation for Duct Size and Grill for Exhaust Air VNT System for TH-1(2) of Floor at Elevation -8.315 5 No. E.A. Grill 275 x 225 mm 03 4300 0.400 0.300 9.95 C. Calculation for Duct Size and Grill for Exhaust Air VNT System for Tunnel of Conveyor BCN-1(2) up to W.T.-3 Complex 3 No. E.A. Grill 300 x 250 mm 04 32800 1.125 0.875 9.26 3 No. E.A. Grill 300 x 250 mm 05 29640 1.100 0.800 9.36 3 No. E.A. Grill 300 x 250 mm 06 26480 1.075 0.725 9.44 3 No. E.A. Grill 300 x 250 mm 07 23320 1.000 0.675 9.60 3 No. E.A. Grill 300 x 250 mm 08 20160 0.925 0.625 9.69 Note: For duct design volume of air for WT-3 Apron Feeder area é from this duct. D. Calculation for Duct Size and Grill for Exhaust Air VNT System for W.T.-3 Complex Apron Feeder Area 5 No. E.A. Grill 375 x 325 mm 09 17000 0.750 0.650 9.69 5 No. E.A. Grill 375 x 325 mm 10 8500 0.500 0.475 9.94
VNT-01-R2
Page 5 of 8
COAL HANDLING SYSTEM CHHABRA THERMAL POWER PROJECT STAGE-I, PHASE-II, 2X250 MW
06.0
Friction Loss Calculation 06.1
Supply Air Ventilation System. Wagon Tippler-3 Hopper Complex, Conveyor BCN-1(2) & Part of TH-1(2)
Section
Q
R Factor
Duct L
Duct W
Duct H
01-02 02-03 03-04 04-05 02-06 06-07 06-08 08-09 09-10 10-11 11-12 12-13 13-14 14-15
55000 13800 9200 4600 41200 5000 36200 32740 29280 25820 22360 18900 13500 8100
0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9
5.00 5.00 5.00 5.00 1.50 23.00 15.00 15.00 15.00 15.00 15.00 25.00 20.00 30.00
1.250 0.700 0.650 0.400 1.200 0.400 1.200 1.150 1.050 1.050 0.900 0.800 0.700 0.525
1.250 0.560 0.400 0.350 1.000 0.350 0.850 0.800 0.800 0.700 0.700 0.700 0.560 0.450
A B C D 06.2
Velocity
9.78 9.78 9.83 9.13 9.54 9.92 9.86 9.89 9.68 9.76 9.86 9.38 9.57 9.52 Total Add Filter Losses Add Grill Losses Add S.F (10%) Total
F.L.
0.29 0.67 0.87 1.10 0.10 5.90 1.14 1.22 1.24 1.37 1.52 2.48 2.57 5.19 25.66 25.00 2.00 5.27 57.93
Exhaust Air Ventilation System. R2 Wagon Tippler-3 Hopper Complex, Conveyor BCN-1(2) & Part of TH-1(2)
Section
01-02 02-03 03-04 02-05 05-06 05-07 07-08 08-09 09-10 10-11 11-12 12-13 A B C VNT-01-R2
Q
R Factor
Duct L
Duct W
Duct H
49500 12400 6200 37100 4300 32800 29640 26480 23320 20160 17000 8500
0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9
5.00 10.00 10.00 5.00 20.00 15.00 15.00 15.00 15.00 20.00 20.00 20.00
1.200 0.650 0.450 1.050 0.400 1.125 1.100 1.075 1.000 0.925 0.750 0.500
1.200 0.550 0.400 1.050 0.300 0.875 0.800 0.725 0.675 0.625 0.650 0.475
Velocity
9.55 9.63 9.57 9.35 9.95 9.26 9.36 9.44 9.60 9.69 9.69 9.94 Total Add Grill Losses Add S.F (10%) Total
F.L.
0.29 1.37 2.06 0.33 5.68 1.03 1.13 1.24 1.39 2.08 2.29 3.73 22.63 2.00 2.463 27.093 Page 6 of 8
COAL HANDLING SYSTEM CHHABRA THERMAL POWER PROJECT STAGE-I, PHASE-II, 2X250 MW
07.0
Selection of Fan (Supply and Exhaust Air). • • •
We have considered 10% margin for fan capacity selection over calculated system capacity. We have selected Centrifugal Fan for Supply Air System. R2 We have selected Centrifugal Fan for Exhaust Air system. R2
07.1
07.2
Supply Air Fan. 07.1.1 07.1.2
Type Capacity
: :
07.1.3 07.1.4 07.1.5
Static Pressure Motor kW Fan efficiency
: : :
Backward Curve Centrifugal –SWSI 60500 m3/hr. (55000 x 1.1 = 60500) 75 mm WG 30.00 / 4 Pole 60% R2
Exhaust Air Fan. R2 07.2.1 07.2.2
Type Capacity
: :
07.2.3 07.2.4 07.2.5
Static Pressure Motor kW Fan efficiency
: : :
Backward Curve Centrifugal –SWSI 54450 m3/hr. (49500 x 1.1 = 54450) 50 mm WG 18.50 / 4 Pole 50%
Reference formulas: 1. Power Calculation: Abs HP = CFM x Fan Pressure 6356 x 25.4 x Fan Eff. 2. Friction Loss in Duct: (Hand Book of Air Conditioning System Design –Carrier) Total P = 0.03 f (L/d1.22) (V/1000)1.82 Where:P f L d V
= = = = =
friction loss (in wag) interior surface roughness (0.9 for MS) length of duct (ft) duct diameter (in) equivalent diameter for rectangular duct work air velocity (fmp)
3. Sample Calculation: A.
5 meter 1.25 meter 1.25 meter Duct air velocity 9.78 m/sec Roughness factor 0.9 (as per ASHRAE) 01. Convert the same as per calculation requirements B. We have Duct Size Length 49.2126 inch Width 49.2126 inch VNT-01-R2
We have Duct Size
Length Width Height
Page 7 of 8
COAL HANDLING SYSTEM CHHABRA THERMAL POWER PROJECT STAGE-I, PHASE-II, 2X250 MW
Height
16.4042 feet Duct air velocity 1925 fpm Roughness factor 0.9 (as per ASHRAE) Convert rectangular duct to round De= 1.30x(a*b)0.625/(a+b)0.25 duct 03. Total P = 0.03 f (L/d1.22) (V/1000)1.82 (Hand Book of Air Conditioning System Design –Carrier) P friction loss (in wag) F interior surface roughness (0.9 for MS) L length of duct (ft) D duct diameter (in) V air velocity (fmp) Calculated answer comes to: 0.29 mm WC 08.0
Equipment Summery. 08.1
Supply Air Side W.T.-3 08.1.1 Centrifugal Fan • Capacity • Model • Static pressure • Drive motor
: : : :
60500 M3/Hr. WRC-BC-SWSI-445-N 75 mmWG 30.0 kW x 4 Pole Qty: 01 No.
08.1.2 Supply Air Filters • 610x610x50 mm
Qty: 20 Nos.
08.1.3 Supply Air Grill • 350 x 300 mm • 300 x 250 mm • 325 x 250 mm • 325 x 300 mm
Qty: Qty: Qty: Qty:
09 Nos. 05 Nos. 15 Nos. 14 Nos.
08.1.4 GI. Ducting and Duct etc. 1 Lot –IS:655 GI Sheet 08.2
Exhaust Air Side W.T.-3 R2 08.2.1 Centrifugal Fan • Capacity • Model • Static pressure • Drive motor 08.2.2 Exhaust Air Grill • 350 x 325 mm • 275 x 225 mm • 300 x 250 mm • 375 x 325 mm
: : : :
54450 M3/Hr. WRC-BC-SWSI-402-N 50 mmWG 18.50 kW x 4 Pole Qty: 01 No. Qty: Qty: Qty: Qty:
08 Nos. 05 Nos. 15 Nos. 10 Nos.
08.2.3 GI. Ducting and Duct etc. 1 Lot –IS:655 GI Sheet VNT-01-R2
Page 8 of 8
RAJASTHAN RAJYA VIDYUT UTPADAN NIGAM LTD., RAJASTHAN
CHHABRA THERMAL POWER PROJECT STAGE –I, PHASE-II, 2 X 250 MW UNIT # 3&4
DESIGN BASIS REPORT OF VENTILATION SYSTEMS FOR W.T.3 COMPLEX, TUNNEL OF CONVEYOR BCN-1(2) & TH-1(2)
Job No.
OWNER
RAJASTHAN RAJYA VIDYUT UTPADAN NIGAM LTD., RAJASTHAN
OWNER’S CONSULTANT
TCE CONSULTING ENGINEERS LIMITED, BANGALORE
EPC AGENCY
THE INDURE PVT LTD,”INDURE HOUSE”, NEW DELHI
SYSTEM SUPPLIER
WRC ENGINEERING CO. PVT. LTD., V.U.NAGAR, GUJARAT
I-3062
Name Prepared By
J.P. PATEL
Date 18.01.2012
P.M. PATEL
20.01.2012
Checked By Approved By Document No. Rev. No. 1. 2.
I-3062-VS-DBR-1022
Record of Revisions Particulars Date Revised Based on TCE Comments Ref No.: 19.05.2012 TCE.5225A/ME/AV/811-107 dated 11.04.2012 Revised Based on TCE Comments Ref No.: 20.03.2012 TCE.5225A/ME/AV/811-115 dated 28.09.2012
VNT-01-R2
Rev No. 2
Checked By
Approved By
PM
PM
AP
PM
COAL HANDLING SYSTEM CHHABRA THERMAL POWER PROJECT STAGE-I, PHASE-II, 2X250 MW
TABLE OF CONTENTS Sr. No. 01.0 02.0 03.0 04.0 05.0 06.0 07.0 08.0 09.0 10.0 11.0 11.1 11.2 12.0 13.0 14.0 15.0
Description Introduction General Description of Ventilation System Standard & Code Layout Design Criteria Friction loss calculation Selection of Fan (Supply & Exhaust) Equipment Summery Schematic (SLD) Supply Air System Schematic (SLD) Exhaust Air System General Arrangement Drawing of Fan with MOC Attachments: Supply Air C.F. Fan Exhaust Air C.F. Fan General Arrangement Drawing of Air Intake Louver with Filter Frame General Arrangement Drawing of Supply Air Filter General Arrangement Drawing of Supply Air Grill General Arrangement Drawing of Exhaust Air Grill
VNT-01-R2
Page No. 02 02 02 02 02 05 06 07 09 10 11
Page 1 of 8
COAL HANDLING SYSTEM CHHABRA THERMAL POWER PROJECT STAGE-I, PHASE-II, 2X250 MW
01.0
Introduction. This document covers description of Ventilation System, equipment sizing, design philosophy for various components of Ventilation System and design philosophy for the control and operation 0f Ventilation System for 2 x 250 MW, Units # 3 & 4 (Stage-I, Phase-II) of Chhabra Thermal Power Station.
02.0
General Description of Ventilation System. Ventilation System is comprised of Supply Air System and Exhaust Air System. Supply Air System consists of Air Filters, Centrifugal Supply Air fan with Outlet flexible connection Vibration isolation Pad and foundation bolts, Inlet Air Louver, Ducting with Supply Air Grills. Exhaust Air System consists of Centrifugal Exhaust Air Fan with Inlet flexible connection, Vibration isolation Pad and foundation bolts, Ducting with Exhaust Air Grills. R2
03.0
Standard and Codes. The applicable standards and codes for various major equipment of Ventilation System are as given below. 1. 2. 3. 4.
04.0
IS:655 IS:4894 IS:3588 IS:277
Specification for Metal Air Duct Centrifugal Fan Specification for electric Axial Fan Specification of GI Sheet
R1
Layout. Ventilation System for Wagon Tippler-3 Building and Tunnel of Conveyor BCN-1(2) is located at TH-1 building.
05.0
Design Criteria. 05.1
Design Ambient Condition.
05.2
The following ambient conditions given in Project Information of NIT would be considered for sizing of Supply and Exhaust Fan. Design ambient temperature Design relative humidity Site elevation
05.3 •
• VNT-01-R2
: : :
0
46.3 C 20% to 80% 400 M above MSL
R1
Design requirements.
As stated in technical specification for Ventilation system, suitable ventilation system is provided for underground portion of Wagon Tippler-3 Building along with Tunnel of Conveyor BCN-1(2) and Part of TH-1(2). Fresh and Filtered air is brought in to under-ground portion of Wagon Tippler Building. Page 2 of 8
COAL HANDLING SYSTEM CHHABRA THERMAL POWER PROJECT STAGE-I, PHASE-II, 2X250 MW
• •
• • • •
12 air changes are considered for supply air system. A set of filters are provided before intake Centrifugal Fan. C.F. Fan will deliver required air in to GI Sheet Duct and there-after it will be distributed in to Wagon Tippler Building through supply air grills located at specific locations. Suitable quantity of supply air grills are considered at regular intervals. We have considered exhaust air volume as 90 % of supply air volume.R2 Suitable quantity of Exhaust air grills are considered at regular intervals. Air velocity considered for design will be less than 10 m/sec in Supply & Exhaust GI Ducting.
05.4
Supply and Exhaust Air Capacity.
Volume of Ventilated area for Supply and Exhaust air is calculated as below:
1. 2. 3. 4. 5. 6.
W.T.-3 Complex Area Elevation at -13.200 floor Elevation at -13.200 floor Elevation at -17.900 floor Tunnel of Conveyor BCN-1(2) Transfer Tower TH-1(2) Floor elevation -5.115 Floor elevation -8.315
Length meter
Width meter
Height meter
Volume m3
16.80 12.15 14.15 65.00
8.70 11.50 11.50 3.80
5.50 5.50 4.40 3.00
803.880 768.487 715.990 741.000
13.80 13.80
10 10
8.32 2.90
Total Volume (V) = VSA+VSB+VSC+VSD+VSE+VSF
-VSA -VSB -VSC -VSD
1148.160 -VSE 400.200 -VSF 4577.717
We are considering 12 air changes per hour for Supply air system = 4577.717 x 12 = 54932.604 m3/hr. We have considered Supply Air Ventilation System of 55000 m3/hr.
VS-01
We are considering Exhaust air system as 90 % of Supply air volume R2 = 55000 x 90 % = 49500 m3/hr. We have considered Exhaust Air Ventilation System of 49500 m3/hr. R2 05.5
VE-01
Selection of Supply Air Filters. We have considered HDPE washable type air filters with filtering efficiency of 95% down to 5 microns for Supply Air Ventilation System. We have selected standard air ‘W’ fold type air filters suitable to fit 610x610 mm size with filter cloth area of 0.5 m2 each filter. (Please refer G.A. Drawing for cloth area) We have considered air velocity of 1.8 m/sec at filter inlet. Considering Supply Air System capacity of 55000 m3/hr. and velocity of air entering filters as 1.8 m/sec., calculated cloth area will be ((55000/3600)/1.8)= 8.49 m2.
VNT-01-R2
Page 3 of 8
COAL HANDLING SYSTEM CHHABRA THERMAL POWER PROJECT STAGE-I, PHASE-II, 2X250 MW
Considering unit air filter cloth area as 0.5 m2, calculated total numbers of filter are (8.49/0.5)=16.98 numbers. We have selected 20 (5x4) numbers of supply air filters for Supply Air Ventilation system. 05.6
Selection of Supply & Exhaust Air Ducting & Grills. We have considered duct air velocity of 10 m/sec. for supply & exhaust air ducting. We have considered grill air velocity of 4 m/sec. for supply & exhaust air grills. We have considered grill spacing of maximum 5 meter distance. We have considered duct at maximum 3 meter distance with / without tie rod as per civil requirements.
1) Based on calculation for individual space volume and considered air change for supply air, we have considered space volume for Supply Air Ventilation System as under: A. 13800 m3/hr B. 5000 m3/hr C. 17300 m3/hr D. 18900 m3/hr Sr. No.
Air Volume M3/hr
TH-1 (2) of Floor at Elevation -5.115 TH-1 (2) of Floor at Elevation -8.315 W.T.3 Hopper Area of Floor at Elevation -17.900 & Tunnel of Conveyor BCN-1(2) W.T.3 Hopper Area of Floor at Elevation -13.200 Duct Size Length mt
Width mt
Air Velocity m/sec
Number of Grill and Grill Size
A. Calculation for Duct Size and Grill for Supply Air VNT System for TH-1(2) of Floor at Elevation -5.115 01 13800 0.700 0.560 9.78 3 No. S.A. Grill 350 x 300 mm 02 9200 0.650 0.400 9.83 3 No. S.A. Grill 350 x 300 mm 3 No. S.A. Grill 350 x 300 mm 03 4600 0.400 0.350 9.13 B. Calculation for Duct Size and Grill for Supply Air VNT System for TH-1(2) of Floor at Elevation -8.315 5 No. S.A. Grill 300 x 250 mm 04 5000 0.400 0.350 9.92 C. Calculation for Duct Size and Grill for Supply Air VNT System for Tunnel of Conveyor BCN-1(2) up to W.T.-3 Complex 3 No. S.A. Grill 325 x 250 mm 06 36200 1.200 0.850 9.86 3 No. S.A. Grill 325 x 250 mm 07 32740 1.150 0.800 9.89 3 No. S.A. Grill 325 x 250 mm 08 29280 1.050 0.800 9.68 3 No. S.A. Grill 325 x 250 mm 09 25820 1.050 0.700 9.76 3 No. S.A. Grill 325 x 250 mm 10 22360 0.900 0.700 9.86 Note: For duct design volume of air for WT-3 Apron Feeder area é from this duct. D. Calculation for Duct Size and Grill for Supply Air Feeder Area 11 18900 0.800 0.700 9.38 12 13500 0.700 0.560 9.57 13 8100 0.525 0.450 9.52 VNT-01-R2
VNT System for W.T.-3 Complex Apron 4 No. S.A. Grill 325 x 300 mm 4 No. S.A. Grill 325 x 300 mm 6 No. S.A. Grill 325 x 300 mm Page 4 of 8
COAL HANDLING SYSTEM CHHABRA THERMAL POWER PROJECT STAGE-I, PHASE-II, 2X250 MW
2) Based on calculation for individual space volume and considered air change for exhaust air, we have considered space volume for Exhaust Air Ventilation System as under: R2 A. 12400 m3/hr B. 4300 m3/hr C. 15800 m3/hr D. 17000 m3/hr Sr. No.
Air Volume M3/hr
TH-1 (2) of Floor at Elevation -5.115 TH-1 (2) of Floor at Elevation -8.315 W.T.3 Hopper Area of Floor at Elevation -17.900 & Tunnel of Conveyor BCN-1(2) W.T.3 Hopper Area of Floor at Elevation -13.200 Duct Size Length mt
Width mt
Air Velocity m/sec
Number of Grill and Grill Size
A. Calculation for Duct Size and Grill for Exhaust Air VNT System for TH-1(2) of Floor at Elevation -5.115 01 12400 0.650 0.550 9.63 4 No. E.A. Grill 350 x 325 mm 02 6200 0.450 0.400 9.57 4 No. E.A. Grill 350 x 325 mm B. Calculation for Duct Size and Grill for Exhaust Air VNT System for TH-1(2) of Floor at Elevation -8.315 5 No. E.A. Grill 275 x 225 mm 03 4300 0.400 0.300 9.95 C. Calculation for Duct Size and Grill for Exhaust Air VNT System for Tunnel of Conveyor BCN-1(2) up to W.T.-3 Complex 3 No. E.A. Grill 300 x 250 mm 04 32800 1.125 0.875 9.26 3 No. E.A. Grill 300 x 250 mm 05 29640 1.100 0.800 9.36 3 No. E.A. Grill 300 x 250 mm 06 26480 1.075 0.725 9.44 3 No. E.A. Grill 300 x 250 mm 07 23320 1.000 0.675 9.60 3 No. E.A. Grill 300 x 250 mm 08 20160 0.925 0.625 9.69 Note: For duct design volume of air for WT-3 Apron Feeder area é from this duct. D. Calculation for Duct Size and Grill for Exhaust Air VNT System for W.T.-3 Complex Apron Feeder Area 5 No. E.A. Grill 375 x 325 mm 09 17000 0.750 0.650 9.69 5 No. E.A. Grill 375 x 325 mm 10 8500 0.500 0.475 9.94
VNT-01-R2
Page 5 of 8
COAL HANDLING SYSTEM CHHABRA THERMAL POWER PROJECT STAGE-I, PHASE-II, 2X250 MW
06.0
Friction Loss Calculation 06.1
Supply Air Ventilation System. Wagon Tippler-3 Hopper Complex, Conveyor BCN-1(2) & Part of TH-1(2)
Section
Q
R Factor
Duct L
Duct W
Duct H
01-02 02-03 03-04 04-05 02-06 06-07 06-08 08-09 09-10 10-11 11-12 12-13 13-14 14-15
55000 13800 9200 4600 41200 5000 36200 32740 29280 25820 22360 18900 13500 8100
0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9
5.00 5.00 5.00 5.00 1.50 23.00 15.00 15.00 15.00 15.00 15.00 25.00 20.00 30.00
1.250 0.700 0.650 0.400 1.200 0.400 1.200 1.150 1.050 1.050 0.900 0.800 0.700 0.525
1.250 0.560 0.400 0.350 1.000 0.350 0.850 0.800 0.800 0.700 0.700 0.700 0.560 0.450
A B C D 06.2
Velocity
9.78 9.78 9.83 9.13 9.54 9.92 9.86 9.89 9.68 9.76 9.86 9.38 9.57 9.52 Total Add Filter Losses Add Grill Losses Add S.F (10%) Total
F.L.
0.29 0.67 0.87 1.10 0.10 5.90 1.14 1.22 1.24 1.37 1.52 2.48 2.57 5.19 25.66 25.00 2.00 5.27 57.93
Exhaust Air Ventilation System. R2 Wagon Tippler-3 Hopper Complex, Conveyor BCN-1(2) & Part of TH-1(2)
Section
01-02 02-03 03-04 02-05 05-06 05-07 07-08 08-09 09-10 10-11 11-12 12-13 A B C VNT-01-R2
Q
R Factor
Duct L
Duct W
Duct H
49500 12400 6200 37100 4300 32800 29640 26480 23320 20160 17000 8500
0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9
5.00 10.00 10.00 5.00 20.00 15.00 15.00 15.00 15.00 20.00 20.00 20.00
1.200 0.650 0.450 1.050 0.400 1.125 1.100 1.075 1.000 0.925 0.750 0.500
1.200 0.550 0.400 1.050 0.300 0.875 0.800 0.725 0.675 0.625 0.650 0.475
Velocity
9.55 9.63 9.57 9.35 9.95 9.26 9.36 9.44 9.60 9.69 9.69 9.94 Total Add Grill Losses Add S.F (10%) Total
F.L.
0.29 1.37 2.06 0.33 5.68 1.03 1.13 1.24 1.39 2.08 2.29 3.73 22.63 2.00 2.463 27.093 Page 6 of 8
COAL HANDLING SYSTEM CHHABRA THERMAL POWER PROJECT STAGE-I, PHASE-II, 2X250 MW
07.0
Selection of Fan (Supply and Exhaust Air). • • •
We have considered 10% margin for fan capacity selection over calculated system capacity. We have selected Centrifugal Fan for Supply Air System. R2 We have selected Centrifugal Fan for Exhaust Air system. R2
07.1
07.2
Supply Air Fan. 07.1.1 07.1.2
Type Capacity
: :
07.1.3 07.1.4 07.1.5
Static Pressure Motor kW Fan efficiency
: : :
Backward Curve Centrifugal –SWSI 60500 m3/hr. (55000 x 1.1 = 60500) 75 mm WG 30.00 / 4 Pole 60% R2
Exhaust Air Fan. R2 07.2.1 07.2.2
Type Capacity
: :
07.2.3 07.2.4 07.2.5
Static Pressure Motor kW Fan efficiency
: : :
Backward Curve Centrifugal –SWSI 54450 m3/hr. (49500 x 1.1 = 54450) 50 mm WG 18.50 / 4 Pole 50%
Reference formulas: 1. Power Calculation: Abs HP = CFM x Fan Pressure 6356 x 25.4 x Fan Eff. 2. Friction Loss in Duct: (Hand Book of Air Conditioning System Design –Carrier) Total P = 0.03 f (L/d1.22) (V/1000)1.82 Where:P f L d V
= = = = =
friction loss (in wag) interior surface roughness (0.9 for MS) length of duct (ft) duct diameter (in) equivalent diameter for rectangular duct work air velocity (fmp)
3. Sample Calculation: A.
5 meter 1.25 meter 1.25 meter Duct air velocity 9.78 m/sec Roughness factor 0.9 (as per ASHRAE) 01. Convert the same as per calculation requirements B. We have Duct Size Length 49.2126 inch Width 49.2126 inch VNT-01-R2
We have Duct Size
Length Width Height
Page 7 of 8
COAL HANDLING SYSTEM CHHABRA THERMAL POWER PROJECT STAGE-I, PHASE-II, 2X250 MW
Height
16.4042 feet Duct air velocity 1925 fpm Roughness factor 0.9 (as per ASHRAE) Convert rectangular duct to round De= 1.30x(a*b)0.625/(a+b)0.25 duct 03. Total P = 0.03 f (L/d1.22) (V/1000)1.82 (Hand Book of Air Conditioning System Design –Carrier) P friction loss (in wag) F interior surface roughness (0.9 for MS) L length of duct (ft) D duct diameter (in) V air velocity (fmp) Calculated answer comes to: 0.29 mm WC 08.0
Equipment Summery. 08.1
Supply Air Side W.T.-3 08.1.1 Centrifugal Fan • Capacity • Model • Static pressure • Drive motor
: : : :
60500 M3/Hr. WRC-BC-SWSI-445-N 75 mmWG 30.0 kW x 4 Pole Qty: 01 No.
08.1.2 Supply Air Filters • 610x610x50 mm
Qty: 20 Nos.
08.1.3 Supply Air Grill • 350 x 300 mm • 300 x 250 mm • 325 x 250 mm • 325 x 300 mm
Qty: Qty: Qty: Qty:
09 Nos. 05 Nos. 15 Nos. 14 Nos.
08.1.4 GI. Ducting and Duct etc. 1 Lot –IS:655 GI Sheet 08.2
Exhaust Air Side W.T.-3 R2 08.2.1 Centrifugal Fan • Capacity • Model • Static pressure • Drive motor 08.2.2 Exhaust Air Grill • 350 x 325 mm • 275 x 225 mm • 300 x 250 mm • 375 x 325 mm
: : : :
54450 M3/Hr. WRC-BC-SWSI-402-N 50 mmWG 18.50 kW x 4 Pole Qty: 01 No. Qty: Qty: Qty: Qty:
08 Nos. 05 Nos. 15 Nos. 10 Nos.
08.2.3 GI. Ducting and Duct etc. 1 Lot –IS:655 GI Sheet VNT-01-R2
Page 8 of 8
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