1

Spandan

July to September, 2017 / Issue 2

www.otpcindia.in

ONGC TRIPURA POWER COMPANY LIMITED(2X363.3MW CCPP) - A ISO 9001:2008, ISO 14001:2004 & BS OHSAS 18001:2007 Certified Power Plant

3

From MD’s DeskDear Friends,

Welcome to the second edition of Spandan.

In pursuit of our objective of maintaining high level of machine availability, we had undertaken some of the major maintenance activities during the last quarter. In July 2017, OTPC for the first time achieved 100% machine availability for both its units.

A feat of similar importance was achieved in subsequent months. During August and September, the plant was under shut-down for maintenance activities. During this shutdown, we completed Hot Gas Path Inspection of our first unit which was due after 24000 hours of operation and with co-operation of and in close co-ordination with ONGC, the maintenance activities related to gas wells and pipelines could also be completed. The boiler licenses were also renewed and a slew of other maintenance activities were concluded in time and the units were brought online even before the scheduled start up time of the units. I take this opportunity to congratulate the team members in putting up a stupendous effort backed with detailed planning in completing the work well within the time.

OTPC believes in adopting sustainable business practices which benefit not only the shareholders but also the community and the local environment. In quest of its adoption, OTPC has taken membership of Global Compact Network India (GCNI), which is the Indian arm of United Nations Global Compact, New York. In September 2017, OTPC hosted the Monthly Knowledge Sharing meeting at Delhi which was well appreciated by the participants.

We believe that OTPC is well poised to contribute to industry as Knowledge based organization. In this stride, we are inculcating industry wide best practices like Knowledge Sharing and Quizzing which transcends sectoral trends and updates to include varied and unrelated areas. We hope to bring forth more news on this in our subsequent editions.

In this issue, we have, inter alia, an article on Clean Development Mechanism and a brief write up on Maintenance Activities undertaken during the shutdown. We wish our readers a valuable read.

Satyajit GangulyManaging Director

3

Generation Statistics for the Quarter· Total Generation: 847 MUs

· Plant Availability Factor: 53%

· Plant Load Factor: 52%

3

54

Inspection and Overhauling of Hydraulic Couplings:

Blending of Dents In Block 2 Gas Turbine Compressor:

Inspection for Block 2 Gas Turbine Generator for Oil Leakage:

Overhauling of Gas Booster Compressor 3:

Installation of New Air Receivers: Lift Adjustment of Block 2 Steam Turbine to Restore Barring Gear:

HPBFP (High pressure boiler feed pump) 1B and 2A was having high temperature problem on lube/working oil. Hydraulic coupling for both the BFPs were dismantled under the supervision of M/S Voith expert. Accumulated oily sludge which was found inside the hydraulic coupling runner and coupling internals was removed and necessary servicing was done. Thorough tube cleaning of lube oil and working oil coolers of these BFPs were also done.

R0/R1 inspection of GT 2 was carried out in the month of June ‘17 and 3 nos. of dents were identified. These dents were blended by expert GE technicians who were available at site for HGPI of block 1 GT to prevent further propagation of the crack which may lead to failure of the blades.

In exciter, outer oil catcher (slip ring side) fins were replaced and the oil catcher was reassembled. In GTG exciter end outer oil catcher top half fins were replaced as they were filled and debarred and the oil catcher was reassembled. Old compressed air hose which was connected to exciter outer bearing ports has been replaced with new.

GBC 3 is running for more than 4 years now. Therefore overhauling of GBC was planned. Accordingly, Gas Booster compressor diaphragm and rotor were removed from the casing and dismantled under supervision of BHEL Hyderabad experts. Dry Gas Seal was also removed for inspection by M/S John Crane and necessary replacement of wearable parts was done.

Two no. of new air receivers of 2.5 m3 and 4 m3 capacity were installed in GBC area and DM Plant area respectively. Due to long distance of GBC station from present receivers moisture is formed which affects the operation of various critical pneumatic valves in GBC and due to many pneumatic valves in DM Plant, air consumption is very high leading to less flow and pressure which ultimately effects the operation of pneumatic valves. Hence, by installing new receivers adjacent to the utilization area, these problems are expected to be resolved.

While preparing to start-up Block 2, it was found that rotor of Steam Turbine had jammed. Lift was checked and observed to be 0.0 mm in Brg#4 (newly replaced bearing during minor inspection of STG-2 as old bearing was found damaged) and the lift readings of all the other bearings had changed from its previous adjusted value. Accordingly, various methods were tried including repeated hand barring; lift adjustment, parallel running of AC JOP and DC JOP, oil flow controller repair etc. and finally barring was achieved after continuous effort of 12 hours.

Hot Gas Path Inspection of Block 1 Gas Turbine: HGPI was scheduled for Block 1 GT as it had run for more than 24000 hrs. During this inspection all the components of Gas turbine viz. Fuel nozzles, Combustion liners, Flow sleeves, Transition pieces, 3 stage rotor blades, 3 stage stator blades (nozzles) were replaced with new ones. In addition various other activities like borescopic inspection, compressor inspection including R0/R1 inspection, blending of observed dents in the compressor blades, etc were also carried out. Unit was synchronized on 06/09/2017 at 22:03 well before the planned start-up time.

Replacement of Block 1 And Block 2 Gas Turbine Inlet Air Filters: Total 3136 numbers of filters (445mm ODX660 mm long) were removed and replaced with new filters in both the blocks to counter the effect of dense fog in the upcoming winter.

Repair of Block 2 Gas Turbine Diffuser:

A major crack was observed on Block 2 Gas Turbine diffuser body which led to severe flue gas leakage. After detailed inspection in this shutdown, it was found that there was a weld leakage in the forged ring holding the two shells of the diffuser together. Also, all the fasteners holding the aft and forward diffuser casing had damaged leading to misalignment of the casings. There was also leakage through the flex seals between diffuser and diffuser duct. In this shutdown, the welding crack was repaired; additional cross stiffeners were welded inside the diffuser casing; flex seal guides were replaced, all fasteners (except those in the spring loaded hanger) holding the aft and forward diffuser shells and the forward and aft shells of the bearing tunnel were replaced after proper alignment of the casings.

Insulation Replacement of Block 2 Gas Turbine Diffuser: After repairing of the diffuser casing entire insulation was replaced with new insulation and further 50 mm of additional insulation has been added to prevent heat loss from the diffuser and safeguard the instruments mounted on the diffuser and also inside the exhaust compartment.

by Tapas Bhowmik, DGM (Mechanical Maintenance)

MAJOR MAINTENANCE ACTIVITIES DURING SHUTDOWN (19TH AUGUST – 07TH SEPTEMBER, 2017)

July to September, 2017 / Issue 2

ONGC TRIPURA POWER COMPANY LIMITED www.otpcindia.in4 5

76

Weekly medical camps were organized at Panchayat Office of West Khilpara, Gangacheera and Palatana where free consultation and counselling was provided by OTPC and medicines were distributed to women.

Engineer’s Day was celebrated at Palatana Station on 10th September, 2017. More than 100 engineers from Tripura University, NIT – Agartala, TIT – Agartala, ICFAI University Techno India and

Polytechnic Institute participated in the Seminar.

Mr. Shashi Shanker, Director – OTPC, inaugurated Solar Garden & Street Light System with a capacity of 4.5 KWP on 2nd Sep., 2017 at new Admin Building, OTPC Site.

SHARING IS CARINGCSR and Recreational activities conducted at OTPC

Health Camp at Gangachera GP

Health Camp at Hajipara, Khilpara GP

Health Camp at Khilpara GP

Health Camp at Palatana GP

Health Camp at Palatana GP

ENGINEER’S DAY CELEBRATION

INAUGURATION OF INTEGRATED SOLAR GARDEN & STREET LIGHT AT PALATANA STATION

Water Purifiers donated to Tripura Sundari HS School.

Mounted fans for Mid-day meal Dining Hall donated to Khilpara HS School.

Trees were planted by Board Members at Palatana Site during 67th Board Meeting

TREE PLANTATION BY BOARD MEMBERS

YOGA SESSION AT HO

July to September, 2017 / Issue 2

6 ONGC TRIPURA POWER COMPANY LIMITED 7www.otpcindia.in

988 ONGC TRIPURA POWER COMPANY LIMITED 9www.otpcindia.in

The Kyoto Protocol has had two commitment periods, the first of which lasted from 2008-2012. The second one runs from 2013-2020 and is based on the Doha Amendment to the Protocol, which has not entered into force as many developed nations did not agree to binding emission reduction targets.

What is CDM? Its Objective? And Benefits?The Clean Development Mechanism (CDM) is one of the Flexible Mechanisms defined in the Kyoto Protocol that provides for emissions reduction projects which generate Certified Emission Reduction units (CERs) which may be traded in emissions trading schemes. The CDM, defined in Article 12 of the Kyoto Protocol, was intended to meet two objectives:

a) to assist parties not included in Annex-I in achieving sustainable development and in contributing to the ultimate objective of UNFCCC, which is to prevent dangerous climate change; and

b) to assist parties included in Annex-I in achieving compliance with their quantified emission limitation and reduction commitments (greenhouse gas (GHG) emission caps).

“Annex-I” parties are the countries listed in Annex-I of the treaty, the industrialized countries. Non-Annex-I parties are developing

countries.

The CDM addresses the second objective by allowing the Annex-I countries to meet part of their emission reduction commitments under the Kyoto Protocol by buying Certified Emission Reduction units from CDM emission reduction projects in developing countries. Each Certified Emission Reduction (CER) is a certificate which is issued every time the United Nations prevents one tonne of CO2 equivalent being emitted through carbon projects registered with the CDM. These CERs can be traded and sold, and used by industrialized countries to a meet a part of their emission reduction targets under the Kyoto Protocol.

The clean development mechanism was designed to meet a dual objective:

1. to help developed countries fulfil their commitments to reduce emissions, and

2. to assist developing countries in achieving sustainable development.

Benefits of CDM projects include investment in climate change mitigation projects in developing countries, transfer or diffusion of technology in the host countries, as well as improvement in the livelihood of communities through the creation of employment or increased economic activity. The mechanism stimulates sustainable development and emission reductions, while giving industrialized countries some flexibility in how they meet their emission reduction limitation targets.

CDM Project Cycle:1. Project Design: Project

participant prepares project design document (PDD), outlining the salient features of the project and estimated carbon reductions making use of approved emissions baseline and monitoring methodology.

2. Host Country Approval: Project participant secures letter of approval from Party. The Designated National Authority

UNFCCC: The United Nations Framework Convention on

Climate Change (UNFCCC) is an international environmental treaty adopted in May 1992 and adopted into force in March 1994 after a sufficient number of countries had ratified it. Its objective is to “stabilize greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous anthropogenic interference with the climate system”. The framework sets no binding limits on greenhouse gas emissions for individual countries and contains no enforcement mechanisms. Instead, the framework outlines how specific international treaties (called “protocols” or “Agreements”) may be negotiated to specify further action towards the objective of the UNFCCC. The famous Kyoto protocol is explained below.

Kyoto Protocol: After the signing

of the UNFCCC treaty, Parties to the UNFCCC have met at conferences (“Conferences of the Parties” – COPs) to discuss how to achieve the treaty’s aims. At the 1st Conference of the Parties (COP-1), Parties decided that the aim of Annex-I Parties (developed nations/industrialized countries) stabilizing their emissions at 1990 levels by the year 2000 was “not adequate”, and further discussions at later conferences led to the Kyoto Protocol. The Kyoto Protocol, came into force in February 2005, set emissions targets for developed countries which are binding under international law. The Protocol is based on the principle of common but differentiated responsibilities: it puts the obligation to reduce current emissions on developed countries on the basis that they are historically responsible for the current levels of greenhouse gases in the atmosphere.

CLEAN DEVELOPMENT MECHANISM (CDM)Project of OTPC

by Amit Dabas, Sr. Manager (Commercial)You will be aware that OTPC Palatana project is one of India’s significant CDM projects. OTPC had envisaged CDM benefits of the project at the very inception of the Palatana Project and has been actively pursuing the CDM project at United Nations Framework Convention on Climate Change (UNFCCC). The CDM project of OTPC was successfully registered at UNFCCC on 26th December 2012 as “Natural gas based combined cycle power plant in Tripura, India” with reference number “06888”. Thereafter, OTPC had undertaken verification process for the generation period from 1st January 2014 to 31st March 2015 and 16,97,953 CERs were issued by UNFCCC to OTPC CDM Project in July 2017. So what is UNFCCC?

July to September, 2017 / Issue 2

1110 11www.otpcindia.in

It is a common knowledge that the pollution levels in the country are reaching higher proportions. To reduce pollution in the country, Government of India (GOI) is taking stringent measures including compliance of the emission norms that are stipulated from time to time. Oxide of Nitrogen or NOx is one of the atmospheric pollutants and is a very common term in power generation parlance especially used in conjunction or association with state /central pollution control and environment agencies.

NOx: N2 Gas, normally relatively inert, comprises 78.08% of the

air by volume. At high temperature & under certain other conditions nitrogen combines with oxygen in the air, forming several gaseous compounds collectively called oxides of nitrogen (NOx)

NOx is harmful for human beings as it initiates reaction that result in the production of OZONE O3) and acid rain. Ozone (O3) is created when nitrogen oxides and Volatile Organic Compounds (VOCs) combine in the presence of sunlight. Ozone & acid rain can result in human health problems, damage to vegetation, reduced to visibility & can harm forest & lakes.

Certain members of this group of pollutants, especially nitrogen dioxide (NO2), are known to be highly toxic to various animals as well to humans. High level may be fatal, while lower levels affect the delicate structure of lung tissue. Humans exposed to high concentrations of NO2 may suffer from lung irritation & it

may potentially result in damage of lungs. Short–term exposure at concentration > 3 ppm can measurably decrease lung function. Concentration < 3 ppm can irritate lungs.

NO2 exposure lowers the resistance of animals to diseases such as pneumonia & influenza.

Oxides of nitrogen can also seriously affect vegetation. Some of the effects include: Killing of plant tissue, causing leaves to fall, reduction in growth rate etc. By controlling NOX level, along with other pollutants, the level of acid rain & ozone can be reduced. The common methods employed in a power plant for reduction of NOx are as below: (1) Injection of water or steam

into the combustion zone - Control technology to lower flame temperature

(2) Use of Dry Low NOx (DLN) combustion - Technology that uses staged combustion and lean-premixed fuel-air mixtures

(3) Operating Gas Turbines in premix mode (PM) mode only.

(4) Online iDLN tuning on regular basis or on requirement basis

(5) Catalytic combustion – A new technology that holds the promise of achieving extremely low emission levels.

(6) Selective catalytic reduction (SCR)

NOx reduction levels using low NOx burner, overfire air & SCR

DLN Combustion flames in PPM & PM Modes

“NOX”

by Mohammad Musa, Manager (C&I)

10 ONGC TRIPURA POWER COMPANY LIMITED

(DNA) of a Party involved in a proposed CDM project activity shall submit a letter indicating the following:

a. That the country has ratified the Kyoto Protocol.

b. That participation is voluntary.

c. And, from host parties, a statement that the proposed CDM project activity contributes to sustainable development

3. Validation: Project design document (PDD) is validated by accredited designated operational entity, private third-party certifier. Validation is the process of independent evaluation of a CDM project activity by a designated operational entity (DOE) against the requirements of the CDM as set out in CDM modalities and procedures and relevant decisions of the Kyoto Protocol Parties and the CDM Executive Board, on the basis of the project design document.

4. Registration: Valid project

is submitted by DOE to CDM Executive Board with request for registration. Registration is the formal acceptance by the Executive Board of a validated project as a CDM project activity. Registration is the prerequisite for the verification, certification and issuance of CERs related to that project activity.

5. Monitoring: Project participant is responsible for monitoring actual emissions from the project according to approved methodology. The monitoring report is prepared at the time of verification of the CDM project.

6. Verification: A designated operational entity (DOE) verifies that emission reductions took place, in the amount claimed, according to approved monitoring plan. Verification is the independent review and ex post determination by the designated operational entity of the monitored reductions in anthropogenic emissions by sources of greenhouse gases that have occurred as a result of a registered CDM project activity during the verification period.

Certification is the written assurance by the designated operational entity that, during the specified period, the project activity achieved the emission reductions as verified.

7. Issuance of CERs: Designated operational entity submits verification report with request for issuance to CDM Executive Board. The CER ISSUANCE steps are as below:

a. Completeness check by secretariat

b. Vetting by secretariat

c. Vetting by Executive Board

d. If a Party or three members of Executive Board request review, issuance request undergoes review, otherwise proceeds to issuance

OTPC has been working on the CDM project as a commitment towards a clean development and as a green energy alternative in the Indian power market. This is also aligned with our commitment to sustainable development goals and Global Reporting Initiatives.

July to September, 2017 / Issue 2

REWARDS & RECOGNITION

Celebrations Corner

MARRIAGE ANNIVERSARIES*Pradip DebnathShakyajit Choudhuri

Mohammad MusaBiswajit Bhattacharjee

Pradip DasAjay Kumar

PRESTIGIOUS “Fame Excellence Award 2017” in Platinum Category for the outstanding project on “Environment Protection”. Awarded to OTPC on 24th Septmber, 2017

Environment Excellence Award 2017 by Mission Energy Foundation under the category of Clean Generator of the Year awarded to OTPC on 23rd September, 2017

Subhajit GangulySuresh KammilaNeeraj Kumar AggarwalMukesh ManglaDinesh Laha

Tapas BhowmikNabarun DevChayan Kumar MitraMeen Prasad SharmaAbhinandan Goswami

Amit DabasBhaskar Sen ChoudhuryJyotirmoy DebbarmaSoham DeManideep Das

Shikha KhullarKuldeep Kumar MishraKaran BakshiDeepti Anand

BIRTHDAYS*

*(July– September 2017)

ONGC TRIPURA POWER COMPANY LTD.Corporate Office: 6th Floor, A Wing, IFCI Tower, 61 Nehru Place, New Delhi-110019. Ph.: 011-26402100Registered & Site Office: Palatana P.O., Udaipur - Kakraban Road, South Tripura - 799105. Ph.: 0381-265234