Chromatographic column temperature control device and control method of chromatographic instrument

Abstract

The invention relates to a chromatographic column temperature control device and control method of a chromatographic instrument, and belongs to the technical field of chromatographic column temperature control of the chromatographic instrument. The aim is to provide improvement of a hardware structure of the chromatographic column temperature control device of the chromatographic instrument and the chromatographic column temperature control method of the chromatographic instrument. According to the technical scheme, the control device comprises a column box body, the column box body is a peripherally sealed box body, and a column box heat preservation layer is arranged on the inner side of the column box body; the column box body is internally provided with a first temperature measuring resistance sensor, a chromatographic column, a heating device, a second temperature measuring resistance sensor, a heat dissipation motor, a blower motor and an electric appliance control box, the bottom of the column box body is provided with a heat dissipation hole, and the heat dissipation hole is also provided with a hollow heat dissipation sheet; and the chromatographic column is arranged in the middle of the column box body through a support, the upper side of the chromatographic column is separately provided with the first temperature measuring resistance sensor, and the lower side of thechromatographic column is provided with the heating device. The control device and the control method are applied to the chromatographic instrument.

Description

technical field [0001] The invention relates to a chromatographic column temperature control device of a chromatographic instrument and a control method thereof, belonging to the technical field of temperature control of a chromatographic column of a chromatographic instrument. Background technique [0002] At present, gas chromatography is used to qualitatively and quantitatively measure the parameters of volatile organic compounds, which are mainly used in the field of online monitoring of flue gas, atmospheric or water quality volatile organic compounds; the temperature control accuracy of the chromatograph will directly affect the effective separation of target substances in the chromatographic column, and It is directly reflected in the peak shape and response time. During use, due to factors such as thermal inertia, hysteresis, thermal conductivity, and external environment, various interferences will occur to the column temperature, resulting in poor resolution of targ...

AI Technical Summary

Problems solved by technology

[0002] At present, gas chromatography is used to qualitatively and quantitatively measure the parameters of volatile organic compounds, which are mainly used in the field of online monitoring of flue gas, atmospheric or water quality volatile organic compounds; the temperature control accuracy of the chromatograph will directly affect the effective separation of target substances in the chromatographic column, and It is directly reflected in the peak shape and response time. During use, due to factors such as thermal inertia, hysteresis, thermal conductivity, and external environment, various interferences will occur to the column temperature, resulting in poor resolution of target substances and peaks. Shape difference, other interference peaks appear, the integral calculation cannot be performed, or the calculation processing error is large, and the concentration of the measured component cannot be accurately reflected

[0003] In order to solve the above technical problems, at present, the sealed column oven is mainly heated by a high-power heating device. This method will cause a long lag time for the temperature rise of the chromatographic column and a large thermal inertia, resulting in relatively large fluctuations in the chromatographic column within a large temperature range. For a long time, in addition, simple PID control is performed simply through the temperature detected by the thermal sensor, and it is impossible to calculate and compensate the heating hysteresis and loss