International Gas Turbines Congress 2003 Tokyo & Exhibition
Post-congress Report |
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This report outlines the outcome of the international congress and associated exhibition that was held by MHI in Tokyo 2-7 November.
Presentations at the international congress included the following four principal papers:
1. Development and in-house shop load test results of M701G2 gas turbine
MHI has developed upgraded M701G2 gas turbine for 50Hz utilities. Combined cycle power output is 484 MW with efficiency of over 58%(LHV) for 1 on 1 configuration.
M701G2 combines the reliable design concepts of the F engines and the state-of-the-art technology such as steam cooled combustor, steam cooled blade ring, advanced airfoil and so on. The combustor is based on the successful dry low NOx combustor developed for F engines with turbine inlet temperature of 1400°C. To achieve the same NOx level as F engines, the flame temperature has to be kept in the range of 1500-1600°C. M701G2 combustor uses steam cooling for transition piece.
In house shop load test for M701G2 prototype engine was conducted in 2002 April, successfully. Test measurement results verify that the critical parameters such as shaft vibration, thrust loads, compressor starting characteristics, and turbine blade metal temperatures are all well within design margins. This gas turbine should be main flame of the combined cycle plant for 50Hz utilities. |
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2. Design for F Class Blast Furnace Gas Firing 300MW Gas Turbine Combined Cycle Plant
BFG (Blast Furnace Gas) is by-product gas from steel work and its amount is huge. Therefore, there is a strong requirement to utilize BFG for high efficiency and large capacity GT.
But comparing with natural gas for standard industrial GT fuel, there are technical difficulties such as low calorie so on in BFG. Therefore, the advanced combustion systems etc. are required to satisfy them.
MHI has developed and delivered BFG firing GT based on many low calorie gas firing GT experiences, and now we are constructing the world first F class BFG firing GTCC. This plant has 300MW plant output with 50% thermal efficiency (LHV base), and in 2004 it will be put into commercial operation. In addition, in this year we lunched the world first F class VR IGCC for commercial operation.
For effective utilization of low calorie gas such as BFG and IGCC, MHI will continue the further technical development and contribute to the environmental protection |
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(PDF:1,100KB)
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3. Advanced Monitoring System for Combustor Pressure Fluctuation
MHI has developed Advanced Combustion Pressure Fluctuation Monitoring (A-CPFM) system, which tunes control parameters automatically to prevent combustion pressure fluctuation.
Pre-mixed combustion is an effective way to reduce NOx emission. However, pre-mixed combustion has an inherent difficulty to keep combustion stability compared with diffusion combustion. Combustion pressure fluctuation, which is caused by combustion instability, has to be prevented in order to keep a high availability factor.
To keep combustion stability, MHI’s gas turbines are controlled with some parameters such as by-pass valve opening or fuel flows. The condition for stable combustion can vary by several reasons, for example, a sudden change of ambient temperature or ageing of GT parts. Thus, A-CPFM receives and analyses measured plant data. It computes suitable adjustment of control parameters according to the data, and executes automatic tuning in real time. |
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(PDF:630KB)
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4. Modernization and Upgrade Programs for Mitsubishi Heavy-Duty Gas Turbine
MHI has been applying many significant advances in gas turbine technology to new unit production, culminating in its latest production engine the 1,500°C gas turbine. These proven and advanced technology features have been arranged in Modernization and Upgrade (M&U) packages which retrofit existing fleets to increase combined cycle power output, efficiency and decrease NOx emissions.
MHI developed many M&U products to meet its customer needs. To provide adequate flexibility and customization, some M&U products can be retrofitted individually or can be combined or consolidated to provide substantial savings to its customers. Economic evaluation will justify one of the available M&U packages to a customer at the next major overhaul.
Combined cycle power output and efficiency are improved by applying retrofit parts. For example, the advanced cooling configurations and materials to turbine blades, hot parts life is kept even with increased firing temperatures.
This paper summarizes M&U programs available for MHI’s heavy-duty gas turbines with special emphasis on programs for M501D/701D engines. Such programs create substantial savings to customers, and are key to maintain competitive advantage in the power generation market.
The associated exhibition portrayed state-of-the-art technology in gas turbines, showing gas turbine models, panels and actual blade and vane. A panel session for newspaper and magazine representatives was held on 5 November.
What particularly drew people’s attention was the new A-CPFM system.
A-CPFM is the acronym for Advanced Combustor Pressure Fluctuation Monitoring System.
Based on the data that is collected from gas turbines and premixed combustion chambers, calculated the scope of operations that does not produce combustor pressure fluctuation is derived.
By automatically adjusting the pilot-scale and bypass valve opening on the combustion system, we can avoid combustor pressure fluctuation. With this, in addition to being able to lengthen the operating life and improve efficiencies of the combustion chamber, we do not have to manually adjust the pilot-scale and bypass valve opening each time even if the fuel constituents will be fluctuated as it is.
By premixing the fuel and air before combustion, Dry Low NOx (i.e. DLN) combustors are applied to the gas turbines, control turbine inlet temperature and cut down on the amounts of nitrogen oxide produced. However, one shortcoming of the DLN combustor is that combustor pressure fluctuation is produced with any slight shift in the flame position. A-CPFM is the new system that answers the search for a system that can operate while keeping in check the combustor pressure fluctuation. |
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The Mitsubishi"F"Series
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Combined Cycle
Power Plants
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