A liquid metal sodium high-power heating system and its adjustment method
A liquid metal sodium heating system technology, applied in the liquid metal sodium high-power heating system and its adjustment field, can solve the problems of limited surface volume of the container, high heating temperature, long heating section length, etc., to achieve enhanced safety and operability sexual effect
Active Publication Date: 2020-05-26
XI AN JIAOTONG UNIV
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Problems solved by technology
[0003] At present, the steam generators of domestic conventional pressurized water reactors are heated by fuel oil or high-temperature steam. Due to the active chemical properties of the sodium medium, sodium leakage in the steam heater will form a violent sodium-water reaction and cause a hydrogen explosion, causing serious consequences.
[0004] According to the existing experimental experience, there are three electric heating methods for sodium working fluid: electric heating wire heating, the heating wire is wound on the container or pipeline to increase the fluid temperature to the rated working condition by radial heat conduction, and the heating power of a single heating wire is relatively low. Small, the surface volume of the container is limited, and it will radiate heat exchange to the environment while conducting heat in the radial direction. The heating temperature required by the fluid is as high as 505°C, the surface temperature of the heating wire is higher, and the radiation heat transfer loss is larger. The heating wire heating is suitable Heating at low power and low temperature; multi-stage heating inside the tube, sodium flow heat exchange in the inner tube, magnesium oxide powder is filled between the inner tube and the outer tube, which plays the role of insulation and heat conduction, the outer tube is heated by electricity, and the surface heat flux density is large, Similar to the heating wire heating method, there is a large impact of radiation heat exchange loss. In addition, due to the multi-stage heating used in the heating section, if there is a problem with the processing of the heating section, causing the sodium in the tube to be charged, the entire circuit may have safety accidents such as electric shock. At the same time, due to the high heating power in the whole experiment, the required length of the heating section is relatively long, which brings a large flow resistance. The whole heating method is multi-stage heating in series. Any problem in any section of the heating section will affect the safety of the entire heating section.
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[0024] Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:
[0025] Such as figure 1As shown, a liquid metal sodium high-power heating system includes a plurality of high-power heaters connected in series in sequence, and the power of each high-power heater is 4.2MW; The first outlet is connected to the first inlet valve 201 of the first high-power heater 1, the second outlet of the three-way is connected to the first bypass valve 401; the upper end of the first high-power heater 1 is connected to the first outlet valve 301, and the first outlet The back-end pipeline of the valve 301 and the first bypass valve 401 back-end pipeline are connected by a three-way intersection; the bypass valve and the bypass pipeline are mainly used for two types of working conditions, one is when the heating power required by sodium is low, and the liquid metal The sodium does not pass through the heater, thereby reducing the flow resistan...
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A liquid metal sodium high-power heating system and its adjustment method include a plurality of high-power heaters, each with a power of 4.2MW, which are divided into a plurality of heating units. Each heating unit includes an electric heater, an inlet valve, an outlet valve, and a bypass valve. Each heating unit is connected in series, and the last heating unit is connected to a reheater, which further regulates the sodium outlet temperature. The electric heating system introduces argon protection, which isolates the reaction of air and other gases with liquid sodium, and at the same time maintains the pressure stability of the heater during operations such as large-scale load rejection, load reduction, and load increase. The adjustment of the entire heating system adopts the "three-step" scheme of on-off, high-power rough adjustment, and low-power fine adjustment, and the introduction of automatic feedback adjustment, so that the sodium outlet temperature of the entire heating system can meet the requirements of the experimental conditions. The entire heating system is cost-effective, safe and reliable, and highly operable.
Description
technical field [0001] The invention relates to the technical field of liquid metal heating, in particular to a liquid metal sodium high-power heating system and its adjustment method Background technique [0002] Sodium-cooled fast reactors usually adopt a sodium-sodium-water loop design. The sodium-water steam generator is an important hub of the secondary and tertiary loops. It heats the main feedwater with the heat generated by the reactor to generate steam, thereby driving the steam turbine to do work. At the same time, the steam generator is also an important barrier separating the secondary loop and the tertiary loop. Once the heat transfer tube breaks, it will cause serious sodium-water reaction, which will seriously affect the availability, economy and reliability of the nuclear power plant operation. A large number of literature surveys found that in the study of sodium-cooled fast reactor steam generators, several countries that developed fast reactors earlier hav...
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IPC IPC(8): F24H1/20F24H1/14F24H9/00F24H9/12F24H9/18F24H9/20
CPCF24H1/142F24H1/202F24H9/001F24H9/1818F24H9/2021F24H9/2028F24H2250/02F24H9/133
Inventor苏光辉向延张大林王明军张魁田文喜秋穗正
OwnerXI AN JIAOTONG UNIV