A device and method for melting and spraying granulation of proliferating agent ceramic pellets

Abstract

The invention discloses a fusing, spraying and pelleting device for ceramic balls of proliferation agents and a method of the fusing, spraying and pelleting device. The fusing, spraying and pelletingdevice comprises a hearth, a pressurization device, a pressure tube, a blowing cavity, a drip tube, a collector and a reverse blowing tube. According to the method, proliferation agent powder is addedinto the hearth from the pressure tube and heated into a molten state through electromagnetic induction heating, proliferation agent liquid drops from the drip tube through pressurization to form proliferation agent liquid drops, the proliferation agent liquid drops are blown into uniform small drops through blowing air, the small drops are dispersed outwardly in a tapered state, inertia gases blown from the reverse blowing tube carry the proliferation agent liquid drops to reduce falling speed of the proliferation agent liquid drops, and the proliferation agent liquid drops are fully cooledto form the ceramic balls of the proliferation agents. By the fusing, spraying and pelleting device and the method thereof, tritium proliferation agent materials of fusion reactors can be produced massively to provide tritium sources for the fusion reactors.

Description

technical field [0001] The invention belongs to the field of deuterium-tritium fusion fuel cycle, and in particular relates to a device and method for melting and spraying granulation of multiplier ceramic pellets. Background technique [0002] With the rapid development of human society, the world's energy consumption will continue to increase. Energy crisis and environmental crisis have become global issues that need to be solved urgently. Safe, clean and sustainable nuclear fusion energy has attracted much attention as the ultimate way to solve the energy crisis. Among them, D-T fusion has the lowest difficulty and is the fusion reaction most suitable for use in nuclear fusion power generation. Tritium is a radioactive isotope of hydrogen, and its natural content is extremely low. Therefore, the DT fuel cycle of fusion reactors usually uses Li to breed tritium. Tritium breeders generally use lithium-containing materials, which are divided into liquid and solid. Solid br...

AI Technical Summary

Problems solved by technology

[0008] 1. The biggest disadvantage of the first method is that it cannot effectively control the size of the pellets. The yield of pellets that meet the requirements is low and the waste is serious. Less than 50% of the pellets with a size between 0.25-0.63mm prepared by this method

The main reason for this problem is that the liquid dripping speed cannot be controlled after melting in this method, and the air injection port adopts one-way air injection, resulting in uneven distribution of dispersed balls. The low-temperature blowing gas causes excessive internal stress and excessive internal defects of the dispersed pellets, which reduces their mechanical properties;

[0009] 2. Due to the strong volatility of Li salt, this method cannot reduce the volatilization of Li, and the rich 6 The sample cost of Li density is very high, which also causes a lot of cost consumption;

[0010] 3. In order to allow the dripping liquid to fully cool and fully form into balls, the distance between the dripping port and the collector is 2-14 meters. Such a high dripping height and the contact time of the small balls with the air during the dripping process are too long. It will cause the high-temperature molten droplets to react with the air, absorb moisture and CO2 in the air, and cause the phase purity of the proliferator material to decrease

[0014] 1. Since the second method cancels the blowing unit, due to the absence of the blowing unit, the liquid size is completely determined by the drop, resulting in poor dispersion, and the particle distribution is still not improved. The particle size of the ball is between 0.25- 1.25mm ball only 50%

[0015] 2. Since the drop opening is only 0.6mm, the size is too small. In order to let the proliferating agent melt drop smoothly, the ball can only be dripped by pressurizing from the pressure port

However, due to the small size of the dripping port, the excessive pressure, and the strong corrosiveness of the metal itself, the corrosion of the platinum tube is very serious, causing great losses.

[0016] 3. Due to the strong volatility of Li salt, this method cannot reduce the volatilization of Li, and the rich 6 The sample cost of Li density is very high, which also caused a lot of cost consumption

[0017] 4. In order to allow the dripping liquid to fully cool and form into balls, the distance between the dripping port and the collector is 2-14 meters. Such a high dripping height and the contact time of the small ball with the air during the dripping process are too long. It will cause the high-temperature molten droplets to react with the air, absorb moisture and CO2 in the air, and cause the phase purity of the proliferator material to decrease

At the same time, the small balls dropped from high altitude are parabolic, so it is difficult to collect and some small balls will fall into the collector and will break and break.

Images