The document provides an update on chemistry-related issues and tasks at the Jhajjar power plant. It discusses the status of implementing ClO2 systems, with various piping and commissioning work expected to be completed by February and March 2023. It also outlines current practices for unit startups and preservation during shutdowns. The document reviews the status of DCC implementation and lists key process instrumentation tags per OS-Chem recommendations. It includes an executive competency mapping template and identifies some station-specific requirements like sampling line blockages, CPU fines removal issues, and corrosion in acid dosing equipment.

1. A Presentation cum Status of
Chemistry related issues- Jhajjar
(3X500MW)
CHEMISTRY HEADS MEET-2022-
23

2. 2
2
ClO2 IMPLEMENTATION STATUS-Jhajjar
• ClO2 system awarded to M/s Purita Water Solution Pvt Ltd.
• LOA No: IGSTPP/CS/18-19/CRN-3089/LOA-3555 dated: 13.11.2019
• Capacity: 2X80 Kg/hr for CW system and 2X13 Kg/ hr for PT & RO systems
• Indent for NaClO2 (31%) and HCl (30% min) raised.
• Estimated expenditure towards chemicals will be Rs 1 Cr/month.
SN Task Date/ duration Completion date
1 Civil construction & installation - completed
2 PLC work & C&I cabling work 40days 15/01/2023
3 Residual transmitters and flow meters 40days 15/01/2023
4 PT & RO ClO2 plant commissioning 50days 25/01/2023
5 CW ClO2 plant piping work 70 days 15/02/2023
6 Final Commissioning 6 days 01/03/2023
7 Operation start From March 2023
Issues:
• Specs of NaClO2
(31%)
• Vendors HCl (33%)

3. 3
3
Unit- startups and preservation: Current
Practices
Shut Down- Preservation
The Sampling lines are kept full open to flushed during shut down.
The boiler is preserved wet and turbine is preserved dry with Instrument air with low RH.
Daily Air vent line sample is analyzed for RH for Turbine.
Periodic recirculation of boiler water is ensured using BCC pumps to homogenize the
chemical concentration dosed.
Start-up
When unit is lit up, the samples lines are hammered in order to clean any blockages.
Boiler is filled from FST and 100% Condensate is polished through CPU.
The clearance for rolling is given on MS silica values below 20ppb.
CBD is kept open till silica remains under limits and reducing trend after synchronization.
Condensate polishing reduced to minimum keeping all the parameters under limit.
Clearance for turbine rolling is recorded at MS silica under 20 ppb and Sodium under 5ppb.
The C&I dry panels are charged for ACC, pH And Conductivity measure.

4. 4
4
DCC Implementation Status
DCC analysers are in place and working satisfactorily.

5. 5
5
PI Tag Status as per OS-Chem
recommendations
PI Tag list for Drum type units (With CPU)
Sl.
No.
Parameters Statu
s
Sl.
No.
Parameters Status Sl. No. Parameters Status
1 DM Makeup Sp. Conductivity Y 11 Feed Water Sp. conductivity Y 21 CPU-A flow Y
2 DM Makeup DCC N 12 Feed water ACC Y 22 CPU-A ACC Y
3 CEP disch. ACC Y 13 Feed water DO Y 23 CPU-B flow Y
4 CEP disch. DCC Y 14 Boiler water pH Y 24 CPU-B ACC Y
5 CEP disch. D. O. Y 15 Boiler water Sp. conductivity Y 25 Hot well Conductivity
, Left
Y
6 CEP disch. Sodium Y 16 Boiler water ACC Y 26 Hot well Conductivity
, Right
Y
7 CPU o/l Sp. Conductivity
(SWAS)
N 17 Boiler water Chloride Y 27 Chiller Temperature N
8 CPU outlet ACC (SWAS) Y 18 Boiler water Silica Y
9 CPU outlet Sodium (SWAS) Y 19 Main Steam ACC Y
10 D/A outlet D.O. Y 20 Main steam Sodium Y

6. 6
6
Executive competency mapping and suggestions for
competency build-up
Executive competency mapping template already sent. Separate
folder.

7. 7
7
Any other station-specific requirement or agenda/critical
constraint
Steam Water Cycle
• Sampling lines get choked very frequently and chemistry is not getting representative sample when at low
pressures during Unit lit up.
• Portable iron analyser be listed in mandatory equipment's for Fe estimation during start up as per LMI.
Source standardization for such analyzers are to be provided.
Condensate Polishing Unit
• CPU fines removal is a big issue. The ARU vessel is so lengthy that fines does not travel till back wash
outlet line and get re-settled before reaching it. It is evident from the resin samples that a lot of attrition of
resin has taken place.
• Corrosion in Acid alkali dosing pumps and lines are a major issue. The availability of these equipment's
becomes a major constraints at CPU and DM area. Alternatives or action plan to be suggested. CPU acid
dosing lines and tanks are heavily corroded. Need recasting.
CW System:
• Requirement of side screen filters due to high TSS. Limiting value of TSS/ Turbidity in CW Channel.
• NABL Labs for testing treatment chemicals.

8. 8
Other:
• Vendor enlistment & procurement guidelines for RO & UF cartridges.
• Chemistry team harbingers won Plant level PC in 2020 and stood second in
2022.
• Research paper published in CORCON journal on CW system preservation
during long shut down.
• OS/ NETRA can initiate the NOCET type competition for chemistry executives.
• For FGD-Lime stone 90% and hydrated lime 83% purity specifications,/ PDI &
site inspection/ quality checks guidelines. Manpower requirements.