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Andhra Pradesh Power Generation Corporation Limited (APGENCO) has proposed one unit of 800 MW capacities Supercritical Coal based Thermal Power unit under expansion at Dr. Narla Tata Rao Thermal Power Station near Ibrahimpatnam (V), Krishna District, Andhra Pradesh. The proposed developmental activity falls under the category A of Project Activity 1(D) under the schedule as per EIA notification issued on 14th September, 2006 and hence the project requires Environmental Clearance from MoEF, Govt of India. In order to assess the likely impacts from current project on the surrounding environment and evaluating the means of alleviating the likely negative impacts, if any, from the proposed project, APGENCO has engaged M/s Ramky Enviro Engineers Ltd, Hyderabad as their environmental consultant. The report has been prepared as per the Terms of References (TOR) of MoE&F, GOI communicated vide letter no. J-13012/24/2012 - IA. II (T) dtd. 26.09.2012.
Andhra Pradesh State has been facing substantial power deficit resulting into sever power cuts on Industrial, Domestic, Commercial and Agriculture sectors. The State of Andhra Pradesh requires substantial addition to its power generating capacity to meet power demand of its rapidly growing industrial, agricultural and other sectors. In order to meet the power demand, one unit of 800 MW supercritical coal based power generation unit has been proposed as expansion unit under stage V in Dr. Narla Tata Rao Thermal Power Station at Ibrahimpatnam, Krishna District, Andhra Pradesh.
Andhra Pradesh Power Generation Corporation Limited (APGENCO) is a State Public Sector undertaking engaged in power generation including operation and maintenance of the power plants. APGENCO came into existence on 28-12-1998 and commenced operations from 01-02-1999 after unbundling from the Andhra Pradesh State Electricity Board (APSEB). This was a sequel to Government’s reforms in Power Sector to un-bundle the activities relating to Generation, Transmission and Distribution of Power, which were earlier taken up by APSEB. All the generating stations owned by erstwhile APSEB were transferred to the control of APGENCO. The installed capacity of APGENCO as on 28-02-2013 is 8924.90 MW comprising 5092.50 MW Thermal, 3829.40 MW Hydro, 2.0 MW Wind and 1 MW solar power stations, and contributes about half the total Energy Requirement of Andhra Pradesh. APGENCO is third largest power generating utility in the Country next to NTPC and MAHAGENCO. Its installed Hydro power capacity of 3829.40 MW is the highest among different utilities in the Country
Basic Principle of Thermal Power Generation
Coal received from the mines at (-) 300 mm size is crushed in the crusher house to (-) 20 mm size, which is further powdered in the coal mills. The powdered coal is burnt in the furnace to generate steam in the boiler. The steam generated in the boiler is expanded in the HP & LP turbines and power is generated in the generator. The steam after expansion in the turbine is condensed in the condenser and condensed steam is recycled back to the boiler. The hot gases from the furnace after loosing heat in different areas go through the Electrostatic Precipitator (ESP) where ash is trapped. The clean gas goes through the chimney. To achieve efficiency without sacrificing availability, it is considered to limit the choice of steam parameters within the supercritical range, in line with the established practice of most of the manufacturers of 1760 MW units. The thermodynamic cycle will consist of the boiler, the steam turbine, the condenser, the condensate extraction and boiler feed systems, the condensate and feed water heaters along with all other necessary equipment for single reheat regenerative feed heating.
Good reputation
Of the eight or nine rakes about five come from MCL, at least one contains coal from Australia and two to three from SCCL. Hence in the event of bifurcation the linkage from SCCL, which falls in Telangana region, will not become a critical factor for the plant,” said the Chief Engineer. The installed capacity of the plant located at Ibrahimpatnam is 1,760 MW with six 210 MW turbines and one 500 MW turbine and has earned the reputation of being one the best thermal power plants in the nation with regard to optimum generation of load factor.
Brief overview
Dr Narla Tata o Thermal Power Plant is also known Vijayawada Thermal Power Plant. It was developed under 4 stages, with the project cost of Rs 193 Crores and Rs 511 Crores respectively. Again with an investment of RS 840 Crores 2 units were commissioned under III Stage. The seventh unit of 500 MW was commissioned in 2009. The station stood first in country during 94-95, 95-96, 96-97, 97-98 and 2001-02 by achieving the highest plant load factor. The station has received many prestigious awards from various organisations. The station has received Meritories productivity awards for twenty consecutive years and Incentive award for eight consecutive years.