Method for controlling power of reboiler of crude krypton and xenon evaporating tower

Abstract

The invention discloses a method for controlling power of a reboiler of a crude krypton and xenon evaporating tower. The method is applied to a rectifying tower assembly. The method comprises the following steps that S1, it is tested that all temperature testing points of the rectifying tower assembly are T1, and liquid oxygen at the bottom of a rectifying tower is rapidly evaporated by regulating the power of the reboiler manually; S2, when temperature of the lower middle portion of the rectifying tower assembly gradually rises to about T2, power output of the reboiler is gradually reduced, and power output is continuously regulated, so that the temperature tends to be stable; S3, when the temperature ranges from T3 to T4, the power value of the reboiler at this moment is recorded to serve as a parameter of a power basic value, power control of the reboiler is changed into automatic regulation, the temperature of control points of the rectifying tower assembly is controlled, and meanwhile the regulating factor is modified according to changes of the power and the temperature value, so that the temperature becomes stable further. The method achieves the purposes that no liquid oxygen is residual, krypton and xenon can not go out, and the operation condition of the reboiler is stable.

Description

technical field [0001] The invention relates to cryogenic technology, in particular to a method for controlling the reboiler power of a crude krypton-xenon enrichment tower. Background technique [0002] When the cryogenic method concentrates the krypton-xenon mixture in liquid oxygen, the concentrated krypton-xenon mixture (Kr+Xe≥99.99%) can be obtained by heating the liquid oxygen through the reboiler at the bottom of the rectification tower to evaporate the liquid oxygen. It is necessary to ensure that the liquid oxygen is completely evaporated while leaving the krypton-xenon mixture to ensure that the krypton-xenon does not escape from the top of the rectification tower, so the power change of the reboiler at the bottom of the tower has a great impact on the concentration effect. If the power is too high, the krypton-xenon mixture will vaporize together with the liquid oxygen, rise to the top of the rectification tower, and finally escape from the rectification tower, re...

AI Technical Summary

Problems solved by technology

If the power is too high, the krypton-xenon mixture will vaporize together with the liquid oxygen, rise to the top of the rectification tower, and finally escape from the rectification tower, resulting in a decrease in the extraction rate of high-purity krypton and high-purity xenon; conversely, if the power is too small , the liquid oxygen evaporates incompletely, and enters the subsequent rectification tower together with the krypton-xenon concentrate, resulting in the purity of the final product not reaching the standard

In actual operation, if the operator manually controls the power output of the reboiler, it is necessary to frequently intervene in the power output of the reboiler, which consumes too much energy of the operator, and if the human control sometimes suddenly changes the temperature of the rectification tower, it does not detect and respond in time and make adjustments , it will lead to a large fluctuation range of power and temperature, which will cause inconvenience to the stability of the working condition of the rectifying tower, and even destroy the overall working condition of the rectifying tower

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