The Boiler Tube Used For Heavy Steam Nuclear Power Plant
wldsteel describes the seamless steel tube made use of in commercial boilers, engine boilers and also coal-fired power plant central heating boilers. According to the steam stress, the thermal power central heating boiler can be divided into reduced pressure, medium stress, high stress, ultra-high stress, subcritical and supercritical stress boiler.
With the growth of nuclear power plant boilers from subcritical to supercritical and ultra-supercritical, the solitary capability of the main device has also developed to 600 thousand kilowatts, 800 thousand kilowatts and even 1 million kilowatts. Because of the energy intake and environmental management demands of the generator set, individuals have greater as well as greater demands for the high-pressure central heating boiler tube. It is proved that appropriate heat pipe materials can greatly enhance vapor parameters as well as boost efficiency of thermal power devices. What is the function of these steel tube heavy steam boilers?
Steam circulation. The water through the condenser, deaerator to by warming the economizer flue waste heat preheating, the water to the water wall surface after preheating, steam drum, down pipe, header into the furnace, the warmed steam after steam-water separation going into the water wall again after the decline tube heating, heavy steam flow in the superheater to the best component of the home heating furnace to the style of the vapor parameters, output to the vapor wind turbine to do benefit the very first time.
Returned after reduced temperature level heavy steam boiler, doing job under the warm of the reheater reheating steam parameters to develop for the second time sent to the vapor generator power (some devices in order to more enhance effectiveness, will be the second time of low temperature level vapor after job, after that back to the reheater vapor heated to develop criteria, the third back to the work of vapor wind turbine system). The vapor after work is sent to the condenser to condense right into water and after that returned to the economizer to develop a cycle.
Increasing steam criteria of thermal power units can not only greatly conserve gas but likewise minimize CO2 emission obviously. Generally, supercritical stress central heating boilers are specified as those whose primary steam outlet pressure is more than 22.0 MPa, as well as those whose major steam electrical outlet stress is greater than 28MPa or whose main heavy steam as well as reheat vapor temperature level are more than 580 ° C. Data show that the parameters (3.5 Mpa, 435 ℃) to high criterion (9 Mpa, 535 ℃) can save fuel 12% to 15%, raising to high parameter and reheat in the middle of a (13.5 Mpa, 535 ℃/ 535 ℃), and can save fuel, 8% to supercritical specification and also reheat in the center of a (24 Mpa, 550 ℃/ 550 ℃) to conserve gas by 8%, by 24 Mpa, 565 ℃ to 565 ℃ to 30 Mpa, 600 ℃/ 600 ℃, loved one effectiveness can be raised by 4.5%,.
The additional intermediate reheat can likewise increase by 2%, namely 30MPa, 600 ° C-600 ° C-600 ° C. Therefore, it is possible to boost the vapor parameters of the existing power station central heating boiler.
Currently, Japan, Europe, the United States as well as various other nations have researched the application of new heat-resistant products in thermal power plant. Using P91/T91 steel has greatly enhanced the performance of supercritical thermal power devices. The successful application of P92/T92 steel has actually enabled the advancement of ultra-supercritical thermal power systems. Over the last few years, the application of brand-new nickel-based alloy materials such as Alloy 600 and also Alloy617 has brought sophisticated supercritical thermal power devices with heavy steam criteria of 700 ° C/720 ° C into application.