• Editorial: OTPC – a jewel in the crown of Indian power sector

    Aug 2018 / by P. K. Chanda

    Power is the basic component of infrastrucrure and it is not only a vital input for industry but also a service provider in our daily life.Thermal power is the largest source of power in India. There are a different types of thermal power plants based on coal, gas and diesel. Total installed capacity of natural gas based power plants in India, is nearly 25,329.38 MW. About 72% of electricity consumed in India is generated by thermal power plants. While contribution of natural gas based power comes from Central sector is 7,490.83 MW, state and private sectors contribute 7,257.95 MW and 10,580.60 MW respectively. Keeping in line with the Government of India’s formulation of various schemes for reforms in power sector in the country and promotion of cogeneration of electricity from renewable and non-conventional energy sources OTPC planned to build a natural gas based combined cycle power plant at Palatana in Tripura. The power plant with a capacity of total 726 MW is built in two phases by BHEL as the EPC contractor. The project provides the success story of best practices of O&M and its excellence; world class maintenance practices in control and instrumentation; forced cooling of GE9FA gas turbine for emergency maintenance and diffuser duct crack rectification method and how to manage and maintan large sized gas fired combined cycle power plant. The prospects of various sources in renewable and non-conventional ones like natural gas based, solar, wind, small hydro, tidal etc will hopefully be more and more explored. The Indian Journal of Power & River Valley Development is privileged to present this special issue which charts some directions for undertaking future power plants based on clean energy. The project set an examplar in clean energy for others who wish to go for natural gas power plant and truly, the Palatana project is a jewel in the crown of Indian power plants.

    Forced cooling of GE 9FA gas turbine for emergency maintenance at OTPC

    Aug 2018 / by Narendra Kumar Gupta, Soubhik Choudhury, Soham Dey and Bibek Roy

    ONGC Tripura Power Company (OTPC) has set up a 2×363.3 MW natural gas based combined cycle power plant (CCPP) at Palatana, Tripura. The first unit of the plant was commissioned on 4th January, 2014 and the second unit was commissioned on 24th March 2015. BHEL was the EPC contractor for setting up of the power plant.

    The power plant is configured with two (2) ultra-modern GE 9FA heavy duty gas turbines (GTs) which represent the world’s most experienced fleet of highly efficient 50 Hz large units with higher output. The 9FA gas turbine is configured with robust dry low NOx (DLN) 2.0+ combustor which is environment friendly, helps in achieving efficiency greater than 56% and emits NOx less than 25 ppm which is much lower than the prescribed limit. The capacity of each of advance class GE 9-FA gas turbines is 232.3 MW and the capacity of each of 2 BHEL make steam turbines is 131 MW.

    OTPC CCPP is major power supplier to seven North Eastern states.

    OTPC GE 9FA gas turbine unit #2 diffuser duct crack rectification

    Aug 2018 / by Bibek Roy, Tapas Bhowmik, Bhaskar Sen Choudhury and Biswajit Sarkar

    ONGC Tripura Power Company (OTPC) has set up a 2 × 363.3 MW natural gas based combined cycle power plant (CCPP) at Palatana, Tripura. The first unit of the plant was commissioned on 4th January, 2014 and the second unit was commissioned on 24th March 2015. BHEL was the EPC contractor for setting up of the power plant.

    The power plant is configured with two (2) ultra-modern GE 9FA heavy duty gas turbines which represent the world’s most experienced fleet of highly efficient 50 Hz large units with higher output. The 9FA gas turbine is configured with robust dry low NOx (DLN) 2.0+ combustor which is environment-friendly, helps in achieving efficiency greater than 56% and emits NOx less than 25 ppm which is much lower than the prescribed limit. The capacity of each of advance class GE 9-FA gas turbines is 232.3 MW and the capacity of each of 2 BHEL make steam turbines is 131 MW.

    OTPC CCPP is major power supplier to seven North Eastern states and supplies power equivalent to around 30% of the entire requirement of the region.

    Managing major shutdown and maintenance of large sized gas fired combined cycle power plant: a journey towards excellence

    Aug 2018 / by Bibek Roy, Satyajit Ganguly and Sudin Chattopadhyay

    ONGC Tripura Power Company (OTPC) has set up a 2 × 363.3 MW natural gas based combined cycle power plant (CCPP) at Palatana, Tripura. The first unit of the plant was commissioned on 4th January, 2014 and the second unit was commissioned on 24th March 2015. BHEL was the EPC contractor for setting up of the power plant.

    The power plant is configured with two (2) ultra-modern GE 9FA heavy duty gas turbines which represent the world’s most experienced fleet of highly efficient 50 Hz large units with higher output. The 9FA gas turbine is configured with robust dry low NOx (DLN) 2.0+ combustor which is environment-friendly, helps in achieving efficiency greater than 56% and emits NOx less than 25 ppm which is much lower than the prescribed limit. The capacity of each of advance class GE 9-FA gas turbines is 232.3 MW and the capacity of each of 2 BHEL make steam turbines is 131 MW.

    OTPC CCPP is major power supplier to seven North Eastern states and supplies power equivalent to around 30% of the entire requirement of the region. Hence any unscheduled unavailability of this plant has a major bearing on the power supply position of North Eastern States. In order to achieve a robust and reliable power supply, it is necessary that OTPC should have a robust major overhauling/turn around maintenance plan compatible with world class system.

    To achieve maximum reliability of the machines, OTPC has introduced proven world class maintenance models (both regular and major/scheduled shutdowns) and proven strategy to implement the same.

    O&M best practices in ONGC Tripura Power Company Ltd (OTPC)

    Jul 2018 / by Satyajit Ganguly, Sudin Chattopadhyay, Bibek Roy, Narendra Gupta, Bhaskar Senchowdhury, Smruti Ranjan Das, and Md. Musa

    ONGC Tripura Power Company (OTPC) has set up a 2 × 363.3 MW natural gas based combined cycle power plant (CCPP) at Palatana, Tripura and the plant was commissioned in 2015. OTPC supplies power equivalent to 30% of North Eastern region requirement and therefore availability and reliability of the power plant assumes critical significance. To achieve maximum availability and reliability of the machines, OTPC has introduced proven world class operation and maintenance models (both regular and major/scheduled shutdowns) and proven strategy to implement the same.

    World class maintenance practices in control and instrumentation at OTPC

    Jul 2018 / by Meen Sharma, Pradip Debnath and Mohammad Musa

    OTPC has embarked on a world class maintenance management concept in order to make the power plant one of the most reliable and safe power plants across the world and to cater to the power demand without interruption.

    Good maintenance practices at power stations have paramount importance in terms of high level of performances of instruments and equipment.

    Proper maintenance planning consists of planning, scheduling, implementation without re-work and with optimized workforce.

    Innovative logistics arrangement for transportation of ODCs

    Jul 2018 / by Satyajit Ganguly, Shree Narayan and Mayank Shekhar

    ONGC Tripura Power Company (OTPC) commissioned the power station in 2015. The first unit of 363.3 MW was commissioned in January 2014 and second unit of same capacity was commissioned in March 2015. The commissioning of the power plant in remote area of Tripura was a colossal task.

    The project, deemed as non-starter by many, was fraught with challenges like unavailability of skilled manpower for construction and erection, unavailability of raw material like steel, cement, bricks etc and most critical of all challenges – Transportation of heavy machines (over dimensional cargoes (ODCs)). BHEL was the EPC contractor and ABC India Ltd was the logistics provider. The ODCs came from Tiruchirappalli, Haridwar, Bhopal, Hyderabad in India and from manufacturing units of General Electric.

    All possible transport routes (air/waterway/rail/road) were explored for transportation of ODCs and it was found that only the combined waterways and road route was feasible. This route required transportation of machines through Bangladesh. Government of India and Government of Bangladesh (GoB) supported the project in according appropriate permissions for supply of the heavy equipment. A historic MoU was executed with the GoB at Dhaka on 30th November, 2010 which opened a new ‘silk route’ for the North- Eastern region. It resulted in reduction of transportation time of equipment for Palatana project significantly and opened up a new commercial corridor strengthening the relationship between two neighbouring countries. The project achieved lesser time over-run compared to plants of similar configuration developed during concurrent period like Indraprastha power project at Bawana and Pipapav power project in Gujarat.

    OTPC – a clean development mechanism (CDM) project

    Jul 2018 / by Satyajit Ganguly, Arup C. Sarmah and Amit Dabas

    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 its project and Carbon Emission Reductions (CERs) were issued by UNFCCC to OTPC CDM project in July 2017. OTPC is also pursuing the ensuing verifications of its CDM project under the guidance of its Board.

    OTPC – a success story

    Jul 2018 / by Courtesy: Google, BHEL press releases, etc.

    With a view to tap the large natural gas reserves of Tripura, Oil and Natural Gas Corporation Limited (ONGC) and IL&FS, with IDFC and the Government of Tripura promoted the ONGC Tripura Power Company Limited (OTPC), the special purpose vehicle that houses the 726.6 MW combined cycle gas turbine thermal power project at Palatana. The project supplies power to Tripura’s neighbouring states, and has attracted unprecedented investments to the north eastern region.

    The ONGC Tripura power plant is a 726.3MW combinedcycle gas turbine power plant located in the Palatana village of the Udaipur district in Tripura, India. The first 363.3MW unit of the CCGT plant was dedicated to the nation in June 2013 and the second unit was commissioned in November 2014.

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