Automatic liquid nitrogen filling system of FTIR on-line monitoring instrument and control method of automatic liquid nitrogen filling system

A monitoring instrument and automatic filling technology, applied in the container discharge method, container filling method, instrument and other directions, can solve the problems of wasting labor, affecting the detection accuracy of the instrument, and difficult to ensure the continuous supply of liquid nitrogen, etc. good stability

Active Publication Date: 2019-03-19
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Dewar bottle of the FTIR instrument can be used for up to 24 hours once adding liquid nitrogen. For online monitoring instruments, on-duty maintenance is required, and the liquid nitrogen in the D

Method used

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  • Automatic liquid nitrogen filling system of FTIR on-line monitoring instrument and control method of automatic liquid nitrogen filling system
  • Automatic liquid nitrogen filling system of FTIR on-line monitoring instrument and control method of automatic liquid nitrogen filling system
  • Automatic liquid nitrogen filling system of FTIR on-line monitoring instrument and control method of automatic liquid nitrogen filling system

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0038] Example 1

[0039] As one of the embodiments of the present invention, the pressure relief valve 22 is an electromagnetic pressure relief valve 22, and the start and stop of the electric heating device 24 and the pressure relief valve 22 are controlled by an automatic controller, which includes a timer, The automatic controller automatically controls the start and stop states of the electric heating device 24 and the pressure relief valve 22 according to the set time period. The specific control method of this embodiment is: the electric heating device 24 and the pressure relief valve 22 are cyclically opened and closed according to the set time period, and the pressure relief valve 22 is closed synchronously when the electric heating device 24 is opened, and when the electric heating device 24 is closed The pressure relief valve 22 is opened synchronously, and the electric heating device 24 is opened every 8-12h, and each time is opened for 3-10min.

[0040] The system als...

Example Embodiment

[0041] Example 2

[0042] As another embodiment of the present invention, a temperature sensor is also provided in the Dewar of the FTIR online monitoring instrument, and the signal output end of the temperature sensor is electrically connected to an automatic controller, and the automatic controller collects data according to the temperature sensor. The signal controls the start and stop of the pressure relief valve 22 and the electric heating device 24. The specific control method of this embodiment is: controlling the start and stop of the electric heating device 24 and the pressure relief valve 22 according to the collection signal of the temperature sensor set in the Dewar, specifically: when the temperature is higher than -180°C, the electric heating is turned on The device 24 closes the pressure relief valve 22, and when the temperature is less than -193°C, it is continuously maintained for 80s, that is, the addition of liquid nitrogen is considered complete. At this time,...

Example Embodiment

[0043] Example 3

[0044] Such as Figure 4 , 5 As shown, a liquid nitrogen filling pump head includes a pump head base 20 provided at the mouth of the liquid nitrogen storage tank 10, an exhaust channel is opened in the pump head base 20, and the filling pipe 21 In series with the exhaust channel, the pressure relief valve 22 and the lead wires of the electric heating device 24 are installed on the pump head base 20, and the pump head base 20 is equipped with a pressure sensor 23 and a safety valve. The safety pressure of the safety valve is set It is 20Kpa. The present invention carries out an integrated design for the liquid nitrogen filling system, all components are integrated on the pump head base 20, which greatly facilitates the disassembly and installation between the filling system and the liquid nitrogen storage tank 10, and is convenient for quick replacement of liquid nitrogen Storage tank 10.

[0045] Specifically, the pressure relief valve 22 includes a cone-shaped...

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Abstract

The invention belongs to optical instrument maintenance equipment, and particular relates to an automatic liquid nitrogen filling system of a FTIR on-line monitoring instrument and a control method ofthe automatic liquid nitrogen filling system. The automatic liquid nitrogen filling system of the FTIR on-line monitoring instrument comprises a liquid nitrogen storage tank and a filling pipe, one end of the filling pipe is inserted into the liquid nitrogen storage tank from a bottleneck of the liquid nitrogen storage tank, and the other end of the filling pipe communicates with a Dewar bottle inner cavity of the FTIR on-line monitoring instrument; and an electric heating device is further arranged in the liquid nitrogen storage tank, a pressure release valve is arranged on the filling pipe,and the start and stop of the filling system are jointly controlled by the pressure release valve and the electric heating device. According to the automatic liquid nitrogen filling system of the FTIR on-line monitoring instrument and the control method of the automatic liquid nitrogen filling system, integrated design and optimized improvement are carried out on a pump head of the automatic liquid nitrogen filling system of the FTIR on-line monitoring instrument, high-pressure nitrogen is enabled to be pumped into the FTIR on-line monitoring instrument through the closure of the pressure release valve, the filling system is enabled to lose pressure through the starting of the pressure release valve, so that filling is stopped, pressurization is carried out assisted by the heating device,timed and quantitative filling of liquid nitrogen is simply and efficiently realized, and the stability of the system is good and the working precision is high.

Description

technical field [0001] The invention belongs to optical instrument maintenance equipment, and in particular relates to a liquid nitrogen automatic filling system for an FTIR online monitoring instrument and a control method thereof. Background technique [0002] FTIR online monitoring instrument is an air detection equipment that uses infrared absorption spectrum to detect atmospheric components. As the most cutting-edge technology in the field of air detection, it has developed rapidly in recent years. The spectrum acquisition of the FTIR online monitoring instrument requires the cooperation of the infrared signal transmitting unit and the receiving unit. The infrared signal detecting unit is highly sensitive to temperature, and it needs to be kept in a low temperature working environment to achieve high-precision detection. Because FTIR is online The monitoring instrument needs to continuously cool down the infrared signal detection unit. [0003] The temperature of liqui...

Claims

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Application Information

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IPC IPC(8): F17C5/02F17C13/00F17C13/04G01N21/3504
CPCF17C5/02F17C13/00F17C13/04F17C2221/014G01N21/3504
Inventor 李相贤韩昕高闽光石建国童晶晶王亚平陈军李妍刘建国刘文清
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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