The Central heating boiler tube utilized for steam nuclear power plant

Boiler tube usually describes the smooth steel tube utilized in commercial boilers, locomotive boilers and also coal-fired power plant central heating boilers. According to the vapor stress, the thermal power boiler can be separated into reduced pressure, medium stress, high stress, ultra-high pressure, subcritical and also supercritical stress central heating boiler.
With the advancement of nuclear power plant central heating boilers from subcritical to supercritical as well as ultra-supercritical, the solitary capacity of the major system has also developed to 600 thousand kilowatts, 800 thousand kilowatts and also 1 million kilowatts. As a result of the power intake and also environmental management demands of the generator set, people have higher and higher demands for the high-pressure boiler tube. It is proved that appropriate heat pipeline products can greatly optimize heavy steam specifications as well as enhance effectiveness of thermal power devices. What is the function of these steel tube steam boilers?
Heavy steam circulation. The water with the condenser, deaerator to by heating the economizer flue waste warmth pre-heating, the water to the water wall after pre-heating, heavy steam drum, down pipe, header into the heating system, the heated steam after steam-water splitting up going into the water wall once more after the drop tube heating, heavy steam circulation in the superheater to the most popular component of the heating furnace to the design of the heavy steam parameters, outcome to the steam turbine to do help the first time.
Returned after reduced temperature vapor boiler, doing work under the warm of the reheater reheating steam parameters to make for the second time sent out to the vapor wind turbine power (some units in order to additional improve efficiency, will be the second time of reduced temperature level vapor after work, after that back to the reheater vapor warmed to develop criteria, the third back to the work of steam turbine device). The vapor after job is sent out to the condenser to condense right into water and afterwards went back to the economizer to develop a cycle.
Increasing heavy steam criteria of thermal power units can not just greatly conserve gas yet also reduce CO2 exhaust undoubtedly. Normally, supercritical stress central heating boilers are specified as those whose major heavy steam outlet pressure is more than 22.0 MPa, and also those whose major vapor electrical outlet pressure is more than 28MPa or whose primary vapor as well as reheat heavy steam temperature are more than 580 ° C. Data reveal that the parameters (3.5 Mpa, 435 ℃) to high parameter (9 Mpa, 535 ℃) can save gas 12% to 15%, boosting to high criterion as well as reheat in the middle of a (13.5 Mpa, 535 ℃/ 535 ℃), and can conserve fuel, 8% to supercritical specification and reheat in the middle of a (24 Mpa, 550 ℃/ 550 ℃) to conserve fuel by 8%, by 24 Mpa, 565 ℃ to 565 ℃ to 30 Mpa, 600 ℃/ 600 ℃, loved one efficiency can be enhanced by 4.5%,.
The secondary intermediate reheat can additionally boost by 2%, namely 30MPa, 600 ° C-600 ° C-600 ° C. Therefore, it is possible to improve the steam specifications of the existing power station central heating boiler.
Currently, Japan, Europe, the United States and also various other nations have actually examined the application of brand-new heat-resistant materials in thermal power stations. Making use of P91/T91 steel has actually substantially improved the performance of supercritical thermal power devices. The effective application of P92/T92 steel has made it possible for the development of ultra-supercritical thermal power devices. Over the last few years, the application of brand-new nickel-based alloy materials such as Alloy 600 and also Alloy617 has actually brought innovative supercritical thermal power systems with steam criteria of 700 ° C/720 ° C right into application.