UF6 vaporization automatic control system and control method thereof

Abstract

The invention, which belongs to the technical field of automatic controlling, particularly relates to a UF6 vaporization automatic control system and a control method thereof. A DCS control system of the system is composed of a material holding container internal pressure transmitter, a material holding container outer-wall temperature transmitter, a gas-guide tube temperature transmitter, a current transmitter, an analog-to-digital conversion module, a PID pressure regulator, a program setting device, a sequence controller, a conversion controller, a PID temperature regulator A, a PID temperature regulator B, a protection linkage controller, a digital-to-analog conversion module, a switching value output module, a heating controller, and a heater. And a PLC control system of the system includes a vaporization tank internal pressure transmitter, a doorseal pressure transmitter, a PLC analog input module, a PLC controller, a graphic operation terminal, and an output controller. The DCS control system is used for realizing continuous automatic control and protection of the internal pressure and the wall temperature of the material holding container as well as continuous and automatic control and protection of the gas-guide tube temperature and the heater current; and the PLC control system is used for realizing automatic control and protection of the internal pressure and the doorseal pressure of the vaporization tank.

Description

technical field [0001] The invention belongs to the technical field of automatic control, in particular to a UF 6 Vaporization automatic control system and control method. Background technique [0002] The vaporization of UF6 is the first process of wet or dry preparation of sinterable uranium dioxide powder. The process flow is as follows: the container containing UF6 material is vaporized in the vaporization tank, and the heater of the vaporization tank is located at its tail , The heat generated by the electrothermal effect is evenly diffused to the surroundings of the container through the blowing action of the axial flow fan, so that it is evenly heated from the outside to the inside. As the heating proceeds, the temperature of the container increases gradually, the UF6 material inside it gradually expands, and the internal pressure of the container gradually changes from negative pressure to positive pressure. When the temperature reaches the sublimation point, the U...

AI Technical Summary

Problems solved by technology

During the production process, technicians need to manually control the internal pressure of the material container in the vaporization tank, the internal pressure of the vaporization tank and the pressure of the door seal of the vaporization tank, which not only has a low degree of automation, low control accuracy, and especially low safety and reliability.

In addition, the temperature control of the air duct adopts the outdated on-site instrument position control method, the control error is large, and the service life of the heater is short

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