The Boiler Tube Used For Vapor Nuclear Power Plant
Boiler tube normally describes the smooth steel tube utilized in industrial boilers, locomotive central heating boilers and also coal-fired power plant central heating boilers. According to the vapor stress, the thermal power boiler can be separated right into reduced pressure, tool stress, high pressure, ultra-high pressure, subcritical and also supercritical pressure boiler.
With the advancement of nuclear power plant central heating boilers from subcritical to supercritical and ultra-supercritical, the single capability of the primary system has additionally developed to 600 thousand kilowatts, 800 thousand kilowatts and also also 1 million kilowatts. Due to the power consumption and also environmental management demands of the generator collection, individuals have greater and also greater demands for the high-pressure central heating boiler tube. It is shown that suitable high temperature pipeline products can greatly enhance steam parameters and boost effectiveness of thermal power devices. What is the purpose of these steel tube vapor boilers?
Steam circulation. The water via the condenser, deaerator to by heating the economizer flue waste heat preheating, the water to the water wall after pre-heating, vapor drum, down pipe, header into the heater, the heated steam after steam-water splitting up going into the water wall once more after the drop tube heating, heavy steam flow in the superheater to the hottest part of the heating furnace to the style of the steam parameters, result to the heavy steam wind turbine to do work for the first time.
Returned after reduced temperature level heavy steam central heating boiler, doing work under the warmth of the reheater reheating vapor criteria to design for the second time sent out to the heavy steam generator power (some units in order to additional improve effectiveness, will certainly be the 2nd time of low temperature heavy steam after job, after that back to the reheater vapor heated to create criteria, the 3rd back to the work of vapor turbine unit). The vapor after job is sent out to the condenser to condense into water and afterwards went back to the economizer to form a cycle.
Raising steam specifications of thermal power devices can not only significantly save gas however additionally minimize CO2 emission certainly. Usually, supercritical pressure central heating boilers are specified as those whose primary heavy steam outlet stress is greater than 22.0 MPa, and also those whose primary steam outlet pressure is more than 28MPa or whose primary steam and also reheat steam temperature level are more than 580 ° C. wldsteel.com show that the specifications (3.5 Mpa, 435 ℃) to high criterion (9 Mpa, 535 ℃) can conserve gas 12% to 15%, increasing to high specification and reheat in the center of a (13.5 Mpa, 535 ℃/ 535 ℃), as well as can conserve gas, 8% to supercritical specification and reheat in the middle of a (24 Mpa, 550 ℃/ 550 ℃) to save gas by 8%, by 24 Mpa, 565 ℃ to 565 ℃ to 30 Mpa, 600 ℃/ 600 ℃, relative efficiency can be enhanced by 4.5%,.
The secondary intermediate reheat can additionally raise by 2%, specifically 30MPa, 600 ° C-600 ° C-600 ° C. Therefore, it is possible to enhance the vapor specifications of the existing power station central heating boiler.
At present, Japan, Europe, the United States as well as various other nations have examined the application of brand-new heat-resistant products in thermal power plant. Using P91/T91 steel has significantly enhanced the performance of supercritical thermal power devices. The successful application of P92/T92 steel has enabled the advancement of ultra-supercritical thermal power units. Over the last few years, the application of new nickel-based alloy materials such as Alloy 600 and also Alloy617 has brought innovative supercritical thermal power devices with vapor parameters of 700 ° C/720 ° C into application.