First of all, ultra-supercritical units and supercritical units in thermal power plants refer to the pressure of the working fluid in the boiler. The working fluid in the boiler is water, and the critical parameters of water are: 22.064 MPa, 373.99 ℃[2]; at this pressure and temperature, the densities of water and steam are the same, which is called the critical point of water. If the mass pressure is lower than this pressure, we speak of a subcritical boiler. If the pressure is higher, it is a supercritical boiler. The steam temperature in the oven is not lower than 593°C. not less than 31 MPa, which is called ultra-supercritical.
Secondly, the 2x660 mw supercritical generator set refers to two units with a power generation capacity of 660,000 KWh per hour, which means that the two units normally work together and produce 1 .32 millionkWh of electricity per hour.
The significance of qfsn2-660-2 generator
The greatest importance of using ultra-supercritical is that it can save energy compared to the 660 MW supercritical unit, or about 100% electricity. can be saved per kilowatt hour. However, if an economic comparison is used, the investment for each machine will increase by about 150 million yuan, so an economic comparison cannot be made. At present, domestic ultra-supercritical units of 600 MW and 660 MW are already in operation, but the so-called ultra-supercritical parameters have different values, including 600/600℃, 566/600℃, 600/566℃ and 580/580℃. Wait, there are different opinions on which parameters achieve the best investment performance ratio.
Generators (English name: Generators) are mechanical devices that convert other foenergy sources into electrical energy. They are driven by water turbines, steam turbines, diesel engines or other electrical machines to convert water flow, air flow. , fuel combustion or atomic nuclei The energy produced by fission is converted into mechanical energy and transmitted to the generator, which is then converted into electrical energy. Generators are widely used in industrial and agricultural production, national defense, science and technology and daily life.
Generators come in many forms, but their operating principles are all based on the law of electromagnetic induction and the law of electromagnetic force. Therefore, the general principle of its construction is: use suitable magnetic and conductive materials to form magnetic circuits and circuits that conduct electromagnetic induction between them pto generate electromagnetic energy and achieve the goal of energy conversion.
The meaning of qfsn2-660-2 generator is: QF stands for steam turbine generator; S represents the internal water cooling of the stator; 660 rated capacity is 2 represents two; -pole, this type of generator is a three-phase bipolar alternating current synchronous generator. The generator adopts water-hydrogen cooling method, that is, the stator winding is water-cooled, the rotor winding is hydrogen-cooled, and the stator. The core and structural parts are cooled with hydrogen.