7/23/2019 DBR for Water Treatment http://slidepdf.com/reader/full/dbr-for-water-treatment 1/28 CUSTOMER ITC LIMITED PAPERBOARDS & SPECIALTY PAPERS DIVISION UNIT:TRIBENI , HOOGHLY DISTRICT,WEST BENGAL PROJECT 1 X 12 MW COGENERATION POWER PLANT OWNER’s CONSULTANT SPB PROJECTS AND CONSULTANCY LIMITED CHENNAI SUPPLIER ENMAS GB POWER SYSTEMS PROJECTS LIMITED CHENNAI-600 018. NAME SIGN DATE TITLE: DESIGN BASIS REPORT FOR WATER TREATMENT SYSTEM PPD AVK 24/10/11 CHD KRG 25/10/11 APPD SRS 27/10/11 DOC NO.: EN09-109-G-DOC-0602 REV NO. SIZE : A4 0 √ SUBMITTED FOR APPROVAL INFORMATION REFERENCE RECORD CONSTRUCTION
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M/s. ITC LIMITED, Paperboards & Specialty Papers Division, Unit: Tribeni (hereinafterreferred to as ITC) is developing a coal based Cogeneration Power Plant (CPP) in their existingplant at Chandrahati, Dist. Hooghly, West Bengal. The generated power shall cater to the paperplant needs and power plant auxiliary requirement.
This Design Basis Report (DBR) covers the details pertaining to Water Treatment system forthe above 12 MW Cogeneration Power Plant.
Motors shall have 15% margin up to and including 110kW rating and 10% margin for above110kW rating, over and above the shaft power requirement of driven equipment at design point.
3.0 DESIGN BASIS
3.1 RAW WATER ANALYSIS (For Power Cycle Make-up Stream & Cooling tower
Make-up Stream)
The raw water analysis reports received from the OWNER is provided in the enclosed
“ANNEXURE – 01 – RAW WATER ANALYSIS REPORTS”
The raw water analysis reports (Refer Annexure-1) were studied and selected maximum values
are indicted below. The system will be designed considering these parameters.
The process condensate water analysis reports received from the OWNER is provided in theenclosed “ANNEXURE – 02 – PROCESS CONDENSATE RAW WATER ANALYSISREPORTS”
The process condensate water analysis reports were studied and selected maximum valuesare indicted below. The systems will be designed considering these parameter .
Service cum potable water tank of 5 m3 capacity will be provided at the CHS MCC
room top. OWNER shall terminate the service water at the tank inlet. From this tank 2 x100% service cum potable water pump will be provided. The CHS requirement will be
met by the pumps. OWNER shall terminate the service water at the STG building Topoverhead tank. And Tank capacity for this will be 1.0 m3.
6.0. WATER SYSTEM SCHEME:
The enclosed water balance diagram drawing no EN09-109-P-PFD-0501 Rev 01 andProcess Flow Diagram drawing no. EN09-109-P-PFD-0502 Rev 01, indicate thescheme for water system including water treatment system and cooling water system.
WATER TREATMENT SYSTEM DESCRIPTION:
The power plant water treatment system consists of the following streams,
A. Boiler DM Water Make-Up System (2 x 100% - 30m3/hr Product water each
with 20 hrs operation/day ) consisting of the following,
i. Pre Treatment System consisting of multi grade filter, activated carbon
filter and Ultra filtration unit
ii. RO and Degasser system for meeting for requirement of DM plant
iii. DM Plant consisting of Strong Acid Cation Unit (SAC), Strong Base
Anion Unit (SBA) and Mixed Bed Unit (MB)
B. Condensate Polising System (1 x 100% - 21 m3/hr) consisting of the following,
i. Plate Heat Exchanger Unit
ii. Multi Grade Filter Unit
iii. Mixed Bed Unit
C. Cooling Water Make-Up System (1 x 40m3/hr) consisting of the following,
i. Multi grade Filter
ii. Softener Unit
D. Apart from the above, a Circulating Water Treatment (CWT) System is also
provided for the cooling tower circulating water
A. Boiler DM Water Make-up System
i. Pre Treatment System
45 m3 /hr at 3.5 kg/cm2 of Clarified/ Bore well water for each stream at MGF inlet shallbe provided by OWNER at the terminal point.
The clarified/ bore well water is passed through a Multigrade filter to reduce thesuspended solids present in the water. This filter is provided to keep a check on thesuspended solids. The suspended particles in the feed water get entrapped in the filter
media. The filter will have to be washed with effluent water for 10 to 15 mins daily.
Activated carbon provides an effective method for adsorbing a wide range of organicCompounds and can be considered for use in the removal of organic disinfection byproducts and organic precursors.
Activated carbon is used is known as granular activated carbon and is known as GAC.Granular activated carbon is used in a vessel similar in construction to pressure sandfilter and hence referred to as activated carbon filter.
The Filtered water is then passed through the Ultra Filtration System for furtherpolishing.
Ultrafiltration
2x 100 % Ultra filtration unit (each stream complete with basket filter and UF module),In addition, common Fast flush tank with necessary pumps and valves will be providedfor the UF system. The UF system shall be operated on fully automatic mode throughPLC. The UF system will be operated for 20 hours/day.
Ultra-filtration is a low-pressure membrane process for the removal of colloidal silicaand Colloidal Particles (measured in terms of Silt Density Index). The feed effluentflows from the inside of the fibers, permeates through the membrane and is removed asthe product from the shell side.
Ultra-filtration Pre-treatment is the best pre-treatment technologies for ensuring costeffective performance of the Reverse Osmosis System. Ultra-filtration (UF) is a unitoperation often used to remove suspended solids, colloids, traces of oil andmacromolecules from liquid streams. As pre-treatment to Reverse Osmosis System, UFsignificantly increases the membrane life for the R.O membranes and reduces thecleaning frequencies, thereby reducing operating expense for the R.O System.
The Filtered water is then passed through the RO System for further polishing
ii. RO (Reverse Osmosis) and Degasser System
The treated water collected in the UF product water storage tank will be pumpedthrough RO feed pumps(2W+1S) to the Micron Cartridge filters. The cartridge filterswill be followed by high pressure pumps (2W+1S) to boost the pressure of the waterand then feed into high-pressure Reverse Osmosis (RO) Permeators and Accessories.The RO module shall be complete with micron cartridge filter, necessary dosing for de-chlorination, anti-scalant. A bypass arrangement with a dump valve operated throughthe Oxidation Reduction Potential (ORP) instrument shall be provided to safeguard theRO membranes.
The skid shall be designed for 100% permeate flow required as per plant water balanceat minimum 70 – 75 % recovery.
The RO product water will be further passed through a degasser tower where the weakacids and other corrosive gases will be released. Degassed water from the degassertower will get collected to the degassed water storage tank of 30 min holding capacity
(30cu.m). Degassed water for make up to the auxiliary cooling water system and as feedto the DM plant will be drawn from the degassed water tank through suitable pumps.The RO and degasser system will be operated for 20 hours/day.
iii. DM Plant.
The treated water collected in the degassed water storage tank will be pumped to thetwo DM plant streams through DM feed pumps (2W+1S). Each DM plant stream shallconsist of Stron Acid Cation (SAC) unit followed by Strong Base Anion (SBA) unit andMixed Bed (MB) unit. The product from MB (2 X 30m3/hr ) will be led to 2 nos of DMstorage tanks(MS - Epoxy coated), each of 250 m3 capacity. The DM water tanks shall
be provided with necessary instrumentation to maintain water level.View glass for resin level will be provided in MB Vessels only.
Anion to cation ratio in MB shall be 2 :1 and free board shall be 120%.
Regeneration time for MB is once in 7 days.
A common pH correction dosing pumps (1W+1S) shall be located at the outlet of MBto maintain the required pH of DM water Condensate polishing unit.
All the dosing tanks will be sized for the one day requirement. The MOC of the dosingtank will be HDPE.
B. CONDENSATE POLISING SYSTEM
Process Condensate water will be pumped (By OWNER) to the Plate Heat Exchangefor reducing the temperature from 70 deg.C to 40 Deg.C. The condensate watercollected in the condensate return storage tank (50KL MS Epoxy coated) will bepumped to the condensate polishing unit through CPU Feed Pump (1W+1S). The CPUUnit shall consist of a multi grade filter (MGF) followed by a mixed bed (MB) unit. Theproduct from MB (1 X 21m3/hr) will led to 2 nos of common DM storage tanks.
View glass for resin level will be provided in MB Vessel.
Anion to cation ratio in MB shall be 2 : 1 and free board shall be 120%.
Regeneration time for MB is once in a days.
pH correction dosing system ( with 1W+1S pump) shall be located at the outlet of MBto maintain the required pH of output water. The CPU plant is designed to operated for20 hours/day.
C. COOLING TOWER MAKE-UP WATER SYSTEM:
The cooling tower make up water stream consists of a MGF and a softener unit. Rawwater (40 m3 /hr at 3.5 kg/cm2) shall be provided at Multi-grade filter (MGF) inlet byOWNER. Product water shall be stored in 75 kL MS Epoxy coated storage tank. The
treated water shall be pumped to the cooling tower basin by Cooling Water make uppump (1W+1S) of 40 m3/hr capacity each.
D. CIRCULATING WATER TREATMENT SYSTEM
The CWT system has the following equipments,
H2S04 dosing system (2 dosing pumps & one day tank of suitable capacity).
Non Oxidizing biocide (With dosing tank & ejector based dosing system)
Corrosion & Scale Inhibitor dosing (2 dosing pumps & tank of suitablecapacity)
Piping of UPVC material
Dosing tanks shall be Poly Ethylene semi transparent.
pH & temperature indicator (Gauge) in the Cooling water lines.
Local control panel with ON / OFF / TRIP indication and manual START /STOP push buttons shall be provided.
One no. Side stream filter shall be provided. The capacity of side streamfilter shall be 5% of total circulating water capacity.
8.0. ELECTRICAL SYSTEM
LV MOTORS
General
Motors will conform to the latest edition of applicable IS, IEC standards. Motor dutywill be Continuous. Motors will run continuously at rated output with variation insupply voltage ± 10% and frequency of ± 5% and combined voltage and frequencyvariation of absolute sum 10%. Motors will be suitable for operation at 50°C ambienttemperature. All LV Motors will be of energy efficient type, and will have EFF2efficiency class.
Insulation
Motor winding will be of copper and will have class F insulation but limited to class Btemperature rise.
Bearings
In general motors’ will have anti-frictional ball bearing on both DE & NDE side. Allbearings will be 63 series wherever applicable or as per manufacturer’s standard.
The method of cooling will be TEFC for LV Motors. Degree of protection for enclosurewill be IP55 for indoor and IPW55 for outdoor installation
Temperature Detectors
LV Motors rated from 55kW onwards will be provided with PTC100 thermistor forwinding temperature detection. Thermistors leads will be wired up to the separateterminal box.
Space Heater
LV motors rated from 55kW onwards will be provided with Anti- moisturecondensation space heaters. The Space Heater will be switched on whenever the motoris idle. Space heater wires will be wired up to a separate terminal box.
Motor Main Terminal Box
The terminal box will be capable of withstanding maximum system fault current(50KA) for duration of 0.25 sec. The terminal box will be suitable to rotate by 360° in 4steps and will be mounted on top of the motor body.
Earthing Provision
Double earthing provision for motor body and main terminal boxes will be provided.
9.0. CONTROL & INSTRUMENTATION SYSTEM
Operation of the entire Water Treatment Plant is manual except for the UF/ RO Plants -which will be automated with PLC systems and accordingly pneumatic actuated valveswill be considered at appropriate points in the UF/RO Plants. Two non-redundantProgrammable Logic Controllers (PLCs) will be used for the UF and RO Plantsautomation. These PLCs will be supplied with Modbus RTU RS485 ports (ModbusSlave to Main Plant DCS). Modbus communication is envisaged between PLC andDCS for monitoring purpose.
For the remaining pumps, start / stop will be by manual operation. Pump trip foravoiding dry run will be incorporated through level switches interlocked in MCC Panel.For important Analog measurements, Transmitters will be used with in-built indication.These analog parameters will be connected to DCS through hardwired for monitoringpurpose.
One No. raw water common header line flow measurement with Orifice and differentialpressure transmitter shall be provided.
Collection Source: Surface water tank at PumpHouse
Date of sample collection : 03.03.2011Analysis Completed on : 09.03.2011Method of Sampling : IS : 1622 : 1981 & IS : 3025 (Part - 1) - 1987Mode of Sampling : GrabA. Microbiological Test Findings :
SlNo.
Test parameters Test Method Unit Result
1Sulphar ReducingBacteria /100 ml
IS : 13428 Anex C :1998 CFU Absent
2 Total Viable Count/ml IS : 5402-2002 CFU 1.86 x 10 2
B. Physical Test Findings:1. Appearance (Before Filtration) : Clear 2.Appearance (After Filtration) : clear
C. Chemical Test Findings:
SlNo.
Test parameters Test Method Unit Result
1 a) Colour: IS:3025-1964Clause-5 Hazen 1b) Odour: Unobjectionable
2 Taste: Agreeable3 Turbidity APHA 20 Edn.2130B NTU 4.24 pH value APHA 20 Edn.4500H+B …… 7.45 TSS APHA 20 Edn. 2540 D mg/l <106 Total Dissolved Solids APHA 20 Edn.2540C mg/l 3287 Conductivity at 25˚ C APHA 20 Edn 2510 B µs/cm 5808 Colloidal Silica as
SiO2 APHA 20 Edn. 4500 -
SiO 2 mg/l
0.29
Sodium as NaAPHA 20 Edn. 3500
NaBmg/l
37.810 Potasium as K APHA 20 Edn. 3500 KB mg/l 12.6
12 Barium as Ba IS : 13428 : Annex F mg/l <0.113 P - Alkalinity as
CaCO 3 IS:3025(Part-23)-1986 mg/l
Nil14 M - Alkalinity as
CaCO 3 IS:3025(Part-23)-1986 mg/l
29315 Bi Carbonate as
CaCO 3
IS:3025(Part-23)-1987 mg/l
29316 Carbonate as CaCO 3 IS:3025(Part-23)-1987 mg/l Nil17 Iron as (Ferrous ) APHA 20 Edn.3500FeB mg/l <0.118 Iron as (Ferric) APHA 20 Edn.3500FeB mg/l 0.2319 Calcium as Ca APHA 20 Edn.3500CaB mg/l 5620 Lima as CaO APHA 20 Edn.3500CaB mg/l 7821 Magnesium as Mg APHA20Edn.3500MgB mg/l 1722 Sulphate as SO 4 IS:3025(Part-24)-1986 mg/l <523 sulphide as S - APHA20Edn.3500MgB mg/l <0.124 Chloride as Cl APHA 20 Edn.4500ClB mg/l 1025 Nitrate as NO 3 APHA20Edn.4500NO3 mg/l 1.8
26 Nitrate Nitrogen as N APHA20Edn.4500NO3D mg/l 0.4127 Nitrite as NO 2 APHA20Edn.4500-
NO2Bmg/l
<0.0228 Total Hardness as
CaCO 3 APHA 20 Edn.2340C mg/l
21229 Reactive Silica APHA 20 Edn.4500
SiO 2Cmg/l
12.130 Dissolved Phosphate
as PO 4 APHA 20 Edn.4500 - PD mg/l
<0.00331 Total phosphate as
PO4APHA 20 Edn.4500 - PD mg/l
<0.00332 Copper as Cu APHA 20 Edn.3111B mg/l <0.0533 Manganese as Mn APHA 20 Edn.3111B mg/l 0.0834 Fluoride as F APHA 20 Edn.4500FD mg/l 0.4835 Nickel as Ni APHA 20 Edn. 3111 B mg/l <0.0536 Mercury as Hg APHA 20 Edn.3112B mg/l <0.00137 Cadmium as Cd APHA 20 Edn. 3111 B mg/l <0.0138 Total Chromium as Cr APHA 20 Edn. 3111 B mg/l <0.0539 Arsenic as As APHA 20 Edn.3114C mg/1 0.008
40Cyanide as CN APHA 20 Edn.4500CN-
Fmg/l
<0.05
41 Lead as Pb APHA 20 Edn.3111B mg/l <0.0542 Zinc as Zn APHA 20 Edn.3111B mg/l <0.0543 Aluminium as Al APHA 20 Edn.3111D mg/l <0.03
17 Magnesium as Mg APHA20Edn.3500MgB mg/l 17.318 Sulphate as SO 4 IS:3025(Part-24)-1986 mg/l <519 Chloride as Cl APHA 20 Edn.4500ClB mg/l 1220 Nitrate as NO 3 APHA20Edn.4500NO3D mg/l 1.221 Nitrite as NO 2 APHA20Edn.4500-
NO2Bmg/l
<0.0222 Total Hardness as
CaCO 3 APHA 20 Edn.2340C mg/l
24923 Copper as Cu APHA 20 Edn.3111B mg/l <0.0524 Manganese as Mn APHA 20 Edn.3111B mg/l 0.11
25 Fluoride as F APHA 20 Edn.4500FD mg/l 0.3626 Phenolic Compounds APHA 20 Edn.5530C mg/l <0.00127 Mercury as Hg APHA 20 Edn.3112B mg/l <0.00128 Cadmium as Cd APHA 20 Edn. 3111 B mg/l <0.0129 Selenium as Se APHA 20 Edn.3111B mg/l <0.0130 Arsenic as As APHA 20 Edn.3114C mg/l < 0.00131 Cyanide as CN APHA 20 Edn.4500CN-
Fmg/l
<0.0532 Lead as Pb APHA 20 Edn.3111B mg/l <0.0533 Zinc as Zn APHA 20 Edn.3111B mg/l < 0.0534 Aluminium as Al APHA 20 Edn.3111D mg/l <0.03
35 Boron as B APHA 20 Edn 3500 -BC mg/l <1.036 Barium as Ba IS : 13428 : Annex F mg/l <0.137 Free Carbondioxide APHA 20 Edn.4500 -
CO2C mg/l 0.88
38 Carbonate as CaCO 3 IS:3025(Part-23)-1986 mg/l Nil39 biCarbonate as CaCO 3 IS:3025(Part-23)-1986 mg/l 28940 Sulphide as S - APHA20Edn.4500 S B mg/l <0.141 Sulphide as H2S APHA20Edn.4500 S B mg/l < 0.142 Ammoniacal Nitrogen APHA 20 Edn. 4500
NH3Fmg/l
<0.0143 Ammonia as NH 3 APHA 20 Edn. 4500
NH3Fmg/l
<0.0144 BOD IS : 3025 (Part - 44) -
1993mg/l
<5.045 COD APHA 20EDn 5220 B mg/l <5.046 Dissolved Oxygen IS : 3025 (Part - 38) mg/l 6.247 Total Chromium as Cr APHA 20 Edn. 3111 B mg/l <0.0548 Nickel as Ni APHA 20 Edn. 3111 B mg/l <0.0549 Lima as CaO APHA 20 Edn.3500CaB mg/l 99.450 Iron as Fe(Ferrous ) APHA 20 Edn.3500FeB mg/l <0.151
If any wide variation in water analysis is observed during contract execution stage resulting in
addition / enhancement of any equipment the same shall be at additional cost.
SAMPLE DRAWN BY US :No. W(D)/11-12/687 Date : September 01, 2011 Page 1 of 2Issued to : M/S I.T.C. LTD.
: P.S.P.D., Unit Tribeni, Chandrahati, Hooghly.Your Ref. No. : Letter dtd. 19.08.2011Sample Description : WaterCollection Source : Condensed Water at Paper Machine.Sample Collected on : 19.08.2011Analysis Completed on : 29.08.2011
Method of Sampling: IS : 1622 : 1981 & IS : 3025 (Part -1) - 1987
Mode of Sampling : GrabA. Microbiological Test Findings :Sl
No.Test parameters Test Method Unit Results
1 ColiformOrganism/100ml
APHA 20 Edn. 9222 BCFU < 1
2 E. coli/100ml APHA 20 Edn.9222 D CFU Absent3 TVC IS:5402:2002 CFU 24 Sulphate Reducing
BacteriaIS:13428:1998 Annex - 6
AbsentB. Physical Test Findings:
1. Appearance when analysed : Clear. 2.Appearance After Filtration : Clear.C. Chemical Test Findings:Sl
No.
Test parameters Test Method Unit Results
1 Colour: IS:3025-1964Clause-5 Hazen 12 Smell : Unobjectionable3 TSS APHA 20 Edn. 2540 D mg/l <104 Turbidity APHA 20 Edn.2130B NTU < 15 pH value at 25º C APHA 20 Edn.4500H+B …… 7.16 Conductivity at 25˚ C APHA 20 Edn 2510 B µs/cm 77
Colloidal Silica as SiO 2 APHA 20 Edn. 4500 -
SiO2Cmg/l
< 0.18 Total Dissolved Solids APHA 20 Edn.2540C mg/l 49 Volatile Solids at 550˚C APHA 20 Edn.2540E mg/l < 4
10 Sodium as Na APHA 20 Edn. 3500NaB mg/l < 111 Potasium as K APHA 20 Edn. 3500 KB mg/l < 1
12 P - Alkalinity as CaCO 3 IS:3025(Part-23)-1986 mg/l < 213 M - Alkalinity as
CaCO 3 IS:3025(Part-23)-1986 mg/l
< 214 Silica as SiO 2 APHA 20
Edn.4500SiO2Cmg/l
1.115 Iron as Fe (Ferric) APHA 20 Edn.3500FeB mg/l <0.116 Calcium as Ca APHA 20 Edn.3500CaB mg/l < 117 Magnesium as Mg APHA20Edn.3500MgB mg/l < 118 Sulphate as SO 4 IS:3025(Part-24)-1986 mg/l <519 Chloride as Cl APHA 20 Edn.4500ClB mg/l < 2
20 Nitrate as NO 3 APHA20Edn.4500NO3D mg/l < 0.121 Nitrite as NO 2 APHA20Edn.4500-NO2B
mg/l<0.02
22 Total Hardness asCaCO 3
APHA 20 Edn.2340C mg/l1
23 Copper as Cu APHA 20 Edn.3111B mg/l <0.0524 Manganese as Mn APHA 20 Edn.3111B mg/l < 0.0525 Fluoride as F APHA 20 Edn.4500FD mg/l < 0.126 Phenolic Compounds APHA 20 Edn.5530C mg/l <0.00127 Mercury as Hg APHA 20 Edn.3112B mg/l <0.00128 Cadmium as Cd APHA 20 Edn. 3111 B mg/l <0.01
29 Selenium as Se APHA 20 Edn.3111B mg/l <0.0130 Arsenic as As APHA 20 Edn.3114C mg/l < 0.00131 Cyanide as CN APHA 20 Edn.4500CN-
Fmg/l
<0.0532 Lead as Pb APHA 20 Edn.3111B mg/l <0.0533 Zinc as Zn APHA 20 Edn.3111B mg/l < 0.0534 Aluminium as Al APHA 20 Edn.3111D mg/l <0.0335 Boron as B APHA 20 Edn 3500 -BC mg/l <1.036 Barium as Ba IS : 13428 : Annex F mg/l <0.137 Free Carbondioxide APHA 20 Edn.4500 -
CO2C mg/l 0.88
38 Carbonate as CaCO 3 IS:3025(Part-23)-1986 mg/l 1.039 biCarbonate as CaCO 3 IS:3025(Part-23)-1986 mg/l 1.040 Sulphide as S - APHA20Edn.4500 S B mg/l <0.141 Sulphide as H2S APHA20Edn.4500 S B mg/l < 0.142 Ammoniacal Nitrogen APHA 20 Edn. 4500
NH3Fmg/l
<0.0143 Ammonia as NH 3 APHA 20 Edn. 4500
NH3Fmg/l
<0.0144 BOD IS : 3025 (Part - 44) -
1993mg/l
<5.045 COD APHA 20EDn 5220 B mg/l <5.046 Dissolved Oxygen IS : 3025 (Part - 38) mg/l 5.947 Total Chromium as Cr APHA 20 Edn. 3111 B mg/l <0.05