The vertical Francis turbines developed by Sulzer - Escher Wyss in Zurich using model tests have a runner diameter of 7,900 mm and a maximum runner throat diameter of 7,150 mm. They will be the largest units in Asia (440 MW at 117.35 m net head). The runners, made from stainless steel (13% Cr, 41% Ni), are to be manufactured by DBS-Escher Wyss in Canada and each shipped to Pakistan in one piece. The turbines have to operate over a very large head range (49.4 to 135.6 m net head range). At the rated net head of 117.35 m, each turbines produces 440 MW at an efficiency of at least 91%. The best efficiency is obtained at 82.3 m net head (>94.9%). The following table summarises the most important characteristics of the turbines.
Turbines 11 to 14Electricity for theAt heads higher than the rated values, the values of pressure and flow permissible for tunnel 3 limit the output per unit to 440 MW. The servomotors of the units are designed so that the flow is the maximum 425 m3/s per unit at the rated head. If all four units are not operating at the same flow, then under operating head upto 135.6 m (maximum water level in reservoir), the flow per unit could be increased above 425 m3/s, but not for all four units. Digital governers of type DTL 725 from Sulzer - Eacher Wyss control the speed by adjusting the guidevanes, subject to the pressure constraints applying for the penstock.
The generators have a unit rated output of 480 MVA and a rated voltage of 18 kV. The turbine output will be limited by the generator to 432 MW (power factor 0.9). At rated conditions, the generator efficiency is 98.72%. The rated speed is 90.9 min1 and the runaway speed 199 min1. The generators are of standard design, but with very large dimensions. They are being manufactured in Germany by a consortium made up of Siemens and ABB (led by Siemens), and will be assembled on site. The stator bore diameter is 14 m, the rotors weigh 1475 t and the stators 993 t.Vice Admiral Mansurul Haque - Chairman, PNSCDr. A. Wahhab after obtaining Ph.D. degree in Chemical Engineering from Imperial College of Science and Technology, London joined Attock Oil Company Limited in 1958 and continued to work till 1965. He joined National Refinery Limited in 1965 as Manager (Operations). He was promoted in 1969 as Assistant General Manager, 1970 as Refinery Manager, 1974 as Deputy Managing Director and in 1976 as Managing Director. He developed and executed the Refinery expansion for 1.5 million ton per annum of crude oil capacity. In 1976 he was asked to join Pakistan Atomic Energy Commission for construction of re-processing plant. This Project was later abandoned and in 1977 he was transferred to Pak Saudi Fertilizers as Managing Director. During his stay of two years he completed the project within the budget and schedule time. On completion of Project he returned to PERAC his parent Organization and was appointed as Director Project, Technical, and Manufacturing. He conceived and developed the Hydrocracker Project for upgradation of Furnace Fuel Oil available from both of Karachi Refineries into high value products such as gasoline, kerosene and diesels. From 1983 to 1989 he was Managing Director of National Petrotech Limited, the Company for executing the Hydrocracker Project. In 1989 he was transferred to ENAR Petrotech Services as Managing Director. In 1991 he resigned from PERAC and joined Attock Refinery Limited as Managing Director. He is member of the Board of Governors of National Management Foundation, Lahore. Dr. A. Wahhab - Managing Director, Attock Refinery LimitedAir Vice Marshal Farooq Umar - Managing Director, P.I.A. Corp.with Many FunctionsMoreover, a new 500 kV line is to be constructed, since the existing 500 kV lines only have the capacity to transmit the power from two of the new units. The line is to go from Tarbela to Lahore and from there via Multan to Jamshoro. This section is under construction and is scheduled for completion in 1992. In the future, it is planned also to build lines from Lahore via Faisalabad to Jamshoro and from there to Karachi. Hence Tarbela is to be connected to Karachi, the largest city in Pakistan, via a 500 kV line.The notice to proceed was effective in March 1988, and turbine Unit 11 was scheduled to be in service in July 1991 and the contract, will conclude with Unit 14 in service May 1992. The successful performance of Units 9 to 10 (178 MW each) supplied DBS in 1984 was an important factor in obtaining this contract from WAPDA.Naseem S. Mirza succeeded as Chairman & Chief Executive of the ICI Group of Companies in Pakistan in October 1983. ICI Pakistan Limited has been operating in the country since its very inception with its first manufacturing plant for Soda Ash in Khewra established 50 years ago. ICI Pakistan is one of the largest private sector companies quoted on the Stock Exchange with an Issued Capital of Rs. 414 million, 62% of which is held by ICI Omicron BV, Netherlands, while the balance is with the Pakistani Public. The Company has been growing at 15% p.a. and currently the annual turnover is over Rs. 4 billion. He graduated with BA(Hons.) from F.C. College Lahore and then proceeded to the UK and earned his Chartered Accountancy qualifications in 1958. Returning to Pakistan, he joined ICI in 1958 and was appointed the Company's Chief Accountant in 1967. Subsequently, progressing to the position of Genera Manager of Paintex, he was recalled to the Head Office where he overviewed the running of the Soda Ash and Speciality Chemicals Business Areas as Director and General Manager. Mr. Mirza was then assigned further senior responsibility as Director for the Polyester Business Area Lahore, leading to his appointment as Chairman. Besides two term President (1987-89) and now member of Overseas Chamber of Commerce & Industry, he is also the Trustee of different Charitable Organizations. Director of Allwin Engineering Industries Ltd. and Director of Taurus Securities Ltd. Naseem S. Mirza - Chairman & C.E. ICI Group of Companies in PakistanPlant Monitoring SystemOn completion the new plant will be controlled at first from the control room of the existing power plant. One year after commissioning of the last unit, it is intended to introduce the SCADA remote control and data compilation system. This will be connected to the new national load distribution centre. The plant monitored system (PMS) to be supplied by Sulzer - Escher Wyss, Zurich, monitors the penstock and tunnel protection, controls the units and maximises the efficiency of each unit. The transient parameters are measured, processed and monitored; in addition, trend analyses are carried out.Characteristics ofAt present, a new load dispatch control centre is under construction in Islamabad, the capital. This will control distribution for the whole country. The centre is to be responsible for frequently control; however, until it is commissioned, Tarbela is responsible for said frequency control.Jahangir N.W. Ansari - Managing Director, Pakistan State Oil.Mr. H.J. Hemmen born in Emmen in the Netherlands in 1937. Joined Unilever in 1956. He served in various capacities in Holland, the U.K. and Nigeria. Before joining Lever Brothers Pakistan Limited in 1990, he was Chairman and Managing Director of Lever Brothers Bangladesh Limited. During 1992, investments of Rs. 650 million were mostly completed, enabling the Company to meet increased demand for Soaps, Detergents, Oils and Fats. Simultaneously the latest technology was introduced in order to achieve lowest cost. Diversification into plant breeding is under implementation and a Seeds processing plant starts operation in December, 1993.Whole Country
The notice to proceed was effective in March 1988, and turbine Unit 11 was scheduled to be in service in July 1991 and the contract, will conclude with Unit 14 in service May 1992. The successful performance of Units 9 to 10 (178 MW each) supplied DBS in 1984 was an important factor in obtaining this contract from WAPDA.
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