Gas turbine generator

Another example of a topping cycle cogeneration system is one based on recovering the thermal energy exhausting from a gas turbine/generator. 

A 165-MW-class gas turbine/generator has been introduced by another manufacturer. This machine, also developed by scaling up a proven design, features a simple-cycle efficiency of 37.5% a turbine inlet temperature of 1235°C a pressure ratio of 30 1, up from 16 1 on the previous generation and an output of 165 MW for gas fuel firing under International Standards Organization (ISO) conditions (101 kPa, 15°C (14.7 psia, 59°F)). A combined-cycle facihty based around this machine could achieve efficiencies up to 58% or a heat rate of about 6209 kj/kWh (5885 Btu/kWh). 

OPTIONS WITH GAS-COMPRESSOR-GAS-TURBINE-GENERATOR COMBINATION... 

Gas turbine generator power output and heat rate eorreetion as result of water injeetion... 

Figure 14-41 illustrates a couple of power capacity styles of gas turbine generators for providing the required hot gas to drive a power turbine connected to mechanical applications such as power generation, gas compression, cogeneration, oil pumping, and others. 

Figure 14-41. Performance specifications for one manufacturer s gas turbine generators that drive the power turbine unit for mechanical and power applications. (Used by permission Bui. 6-204B. Cooper Cameron Corporation, Cooper Rolls Division.)...

The basic gas turbine generates in the open-cycle mode and Figure 15.4 illustrates this. Air is drawn into a compressor and after compression passes into a combustion chamber. At this stage, energy is supplied to the combustion chamber by injecting fuel, and the resultant hot gases expand through the turbine. The turbine directly drives the... 

Manufacturers now offer as standard microprocessor-based control systems as part of their gas turbine generator set. The set can therefore be controlled and monitored from panels adjacent to the machine or, if required, remotely from a central control room. In combined-cycle installations, the system would be linked into the... 

A control system diagram for a gas turbine generator is shown diagrammatically in Figure 15.36. 

Hydrogen plant and gas turbine generator are each a partial load of the nuclear reactor during normal cogeneration operations. Transient or upset conditions in one system may... 

Siemens-Westinghouse Power Corporation, of Pittsburgh, PA, with a subcontract to Allison Engine Company, evaluated a pressurized solid oxide fuel cell coupled with conventional gas turbine technology without a steam plant. The system was operated at a pressure of 7 atm. The fuel cell generated 16 MW of power and the gas turbine generated 4 MW of power. The process showed 67 % efficiency as developed. An efficiency of 70 % is deemed achievable with improvement in component design. The COE is predicted to be comparable to present day alternatives. NOx levels were less than 1 ppm. 

In the area of fuel cells, reliability and availability have much improved. Recent U.S. military experience with phosphoric acid fuel cells found that the mean time between failure (MTBF) was almost 1,800 h and the availability was 67%. This is comparable with the MTBF service intervals for diesel generators. These fuel cells also favorably compare with the service interval needed for a typical gas turbine generation set. Still, much more development is required to obtain a commercially viable product. Today, the typical fuel cell system still requires servicing every 3-4 days to replace its scrubber packs. 

The additional advantage is that it allows the hot emergent gases to drive a turbine and the 200 kW, 3 atm. system is coupled to a small gas turbine generating 50 kW. The predictions are that such combined cell and gas turbine systems can achieve overall efficiencies as high as 70% and it seems... 

The major availability consumptions are in combustion furnace, uaste heat boiler and absorption sections. It is not possible to eliminate these consumptions in sulphuric acid plant for the process system being folloued presently. Houever marginal improvements can be achieved by high temperature combustion system, use of gas turbines, generation of high pressure superheated steam and cocurrent absorption system. 

Analysis of Industrial Processes Application to Pressurized Fluidized Bed Combustor with Steam and Gas Turbine Generators," Paper 10, Intern. Conference on Cogeneration, Washington, D.C., Oct. (1981). 

The gas generated is burned in the combustion chambers and expands through the gas turbine, generating 4.2 MW of electricity. The gas turbine is a single-shaft industrial gas turbine. The fuel supply system, fiiel injectors and the combustors have been redesigned to suit the low calorific value gas (5 MJ/nm ). 

Battery electric (electricity generated from natural gas) High efficiency (55%) of combined-cycle gas turbine generation of electricity In principle, carbon dioxide can be captured at the power station Limited vehicle range -suitable only for city and suburban use... 

---