Compared to the single-stage reciprocating steam engine originally invented by James Watt, the turbo steam engine has greatly improved thermal efficiency, is closer to the ideal reversible process in thermodynamics, and provides more power, and it has almost completely replaced the reciprocating steam engine. Turbine steam engines are particularly suitable for thermal power generation and nuclear power generation. About 80% of the world's electricity is generated by turbine steam engines.
The gas-steam turbine combined cycle is a device that combines a gas turbine and a steam turbine, which are combined according to different thermal cycles, sometimes referred to as a combined cycle. In order to increase the efficiency of the heat engine, the heating temperature in the heat engine should be increased as much as possible and the heat removal temperature should be lowered. However, the thermal cycle of steam turbines and gas turbines does not meet the above requirements well. If they are combined, the steam is heated by the exhaust heat of the gas turbine, and the advantages of higher heating temperature of the gas turbine and lower exhaust heat temperature of the steam turbine can be obtained at the same time.
The theoretical basis of the combined cycle has long been established. One of the founders of thermodynamics, Carnot, proposed the concept of a joint cycle. However, it was not until the middle of the 20th century that practical combined cycle power plants began to be available. The key to developing a combined cycle is to develop a high-temperature, high-performance, high-power gas turbine. In order to adapt to the oil shortage situation, effective coal burning in gas turbines is also a key technology. At present, the world's advanced industrial countries have established combined cycle unit products. Among them, the largest power has exceeded 600,000 kilowatts, and the highest thermal efficiency has reached more than 47%. It is used as a thermoelectric unit and can be used by the unit. The fuel utilization rate can be as high as 80%, and the longest running time of a single unit has exceeded 100,000 hours. It is very difficult to increase the thermal efficiency of the heat engine by 1%.
Therefore, the combined cycle of steam turbine and gas turbine can greatly save energy, and the steam turbine has a good energy saving effect on the crane and saves power.
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