Pressure release purification method for uranium hexafluoride main condenser
A main condenser, uranium hexafluoride technology, applied in steam/steam condensers, lighting and heating equipment, etc., can solve problems such as system pressure rise, unfavorable production line stable operation, etc., to shorten the pressure release time and improve production acceptance. ability, the effect of shortening the production cycle
Inactive Publication Date: 2019-07-09
THE 404 COMPANY LIMITED CHINA NAT NUCLEAR
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Problems solved by technology
If the second and third stage condensers transfer materials to the gas phase of the main condenser during the period, the system pressure will rise rapidly due to the synergistic effect of the pressure relief operation and the gas phase transfer operation, which is not conducive to the stable operation of the production line
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[0029] The present invention is described in detail below in conjunction with accompanying drawing and specific embodiment:
[0030] A method for depressurizing and purifying a uranium hexafluoride main condenser, the specific depressurizing steps and methods are as follows:
[0031] (1) Pressure release preparation
[0032] (1) The pressure relief container is isolated from the production system
[0033] Before the main condenser is depressurized, it is isolated from the entire production condensate receiving system by closing the gas phase inlet and outlet pipeline valves.
[0034] (2) Switching between hot and cold media
[0035] Switch the refrigerant (aqueous ethylene glycol solution at -2 to 2°C) circulating in the depressurization main condenser to the heat medium (aqueous ethylene glycol at 40 to 50°C) and raise its temperature.
[0036] (3) Standby main condenser creates vacuum
[0037] Circulate the refrigerant (ethylene glycol aqueous solution at -2~2°C) to the ...
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The invention belongs to a pressure release purification method for a uranium hexafluoride main condenser. The method comprises the following steps: (1) pressure release preparation; and (2) releasingpressure in a pumping manner. The method has the advantages that when the main condenser temperature rise pressure release method is adopted, the pressure release time of the main condenser is greatly shortened and is reduced to about 6 hours from the original average of 14 hours, so that the whole production period of the main condenser is shortened (i.e., condensation receiving, heating pressure release, heating liquefying, liquid phase sampling transferring, excess material gas phase transferring, and container cooling for standby application), and the production receiving capability of UF6 is effectively improved; meanwhile, due to the change of the pressure release method, conflicts between the second-stage condenser and the third-stage condenser and the pressure release operation ofthe main condenser when the second-stage condenser and the third-stage condenser transfer materials to the main condenser are avoided, and therefore stable operation of a production line is guaranteed.
Description
technical field [0001] The invention belongs to a uranium hexafluoride condensation receiving production process in uranium conversion production, and specifically relates to a pressure relief and purification method for a main condenser before solid uranium hexafluoride is liquefied in the process. Background technique [0002] Uranium hexafluoride (UF6), a stable yet highly volatile uranium compound, has been used as a feedstock for uranium isotope separation plants. Since UF6 is packaged in a liquid form, after the container cools down, the liquid UF6 turns into a solid, and then it is transported safely in a solid form. Therefore, when UF6 is collected in a solid state, it is necessary to convert the solid UF6 into a liquid state. In the process of uranium conversion and production, the condensation and solidification method is generally used to collect UF6. In order to improve the condensation efficiency, it is common practice to use multi-stage condensers. Generally...
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IPC IPC(8): F28B9/00F28B11/00
CPCF28B9/00F28B11/00
Inventor 张振兴李振峰王校峰何平李英锋王伟王鹏飞马晓文陈建勇王俊邹琛华刘璞
Owner THE 404 COMPANY LIMITED CHINA NAT NUCLEAR