Configuration and selection of water quality analysis instruments
Here, we should simply do the important role of water quality analysis instruments in the air separation process, and should follow and pay attention to the analysis and selection of instrumentation, especially the reliability and service life of instrumentation and the standard substance. Standard issues, configuration and selection are a part of system engineering that requires careful and comprehensive consideration.
First, the role of analytical instruments in the air separation process
Analytical instrumentation plays an important role in air separation equipment and gas purification process. It is essential for the adjustment of air separation process and the detection of product quality. Since different types of on-line analytical instruments for monitoring different gas medium objects are arranged at various stages of the air separation process, the operating conditions in the fractionation tower can be understood by analyzing the output signals of the instrument, and the process can be controlled under optimal conditions. The production of purely qualified 0 2 , N 2 , Ar and cryogenic liquids and production requirements can also ensure that the high purity gas meets the quality standards after purification.
Therefore, in the production process of gas and cryogenic liquid products of air separation plants, it is necessary to accurately quantify and strictly control the composition of the gas components at various stages in the process. At the same time, use the online chromatograph to the main condenser in the air separation column. Automatic and continuous detection of the content of hydrocarbons (saturated hydrocarbons and unsaturated hydrocarbons) is an essential part of explosion-proof and safe production in air separation plants.
To this end, in the selection and analysis of instrumentation, the following tasks must be achieved and implemented:
1. Monitor the purity of the process gas in the process to meet the gas purity requirements of each process segment;
2. By analyzing the output data of the instrumentation online, it is possible to timely reflect and grasp the changes of the working conditions of each process;
3. It is possible to adjust the process conditions to work at the best condition;
4. To ensure and control the purity of gas products and cryogenic liquid products produced under safe working conditions to meet the national standards;
5. The analysis of the purified high purity gas impurity components can meet the requirements of national standards.
Second, the configuration and selection of the analyzer
In summary, the online analytical instrumentation and high-purity gas detection instrumentation equipped with air separation equipment should follow the following principles:
1. The commercial price should be cheap or good quality and low price, which can meet the detection needs of the process and the purified gas, and complete the monitoring of the process gas;
2. In quality, online analytical instrumentation and high-purity gas detection instruments are required to have quality requirements and guarantees in terms of range, sensitivity, noise, stability, reliability and service life;
3. Easy to operate and maintain.
The above talks about the importance of analytical instrumentation in the operation of air separation plants and in the purification of high purity gases. It not only performs quality testing of product gases but also ensures safety in gas production operations. Therefore, the requirements for the reliability, accuracy, service life, easy operation and maintenance of analytical instrumentation are put forward. The quality of analytical instruments has always been a concern of users, as it directly relates to product quality and economic benefits. The author has been engaged in the detection and analysis of gas and the installation and debugging of instruments and instruments for many years. From the past situation, it can be said that it is not satisfactory. For example, the thermal magnetic type of two sets of 1000m 3 /h oxygen generators in a steel plant Oxygen analyzers are not used for a long time due to quality problems, that is, the service life is short, which causes great inconvenience to the user and causes economic loss. Some of the analytical instruments commonly used in air separation equipment use thermal conductivity analyzers. Sometimes, due to the unstable performance of the bridge components in the transmitter or the instability of components on a plug-in, the analytical instrument cannot be used or indicated. The value is incorrect, and sometimes the thermal drift occurs due to poor performance of the component, causing the range zero to vary greatly. Unstable component performance and faults on components can occur when other types of analytical instruments are powered up. Due to the zero drift of the analytical instrument range, the user is distrustful of the correctness of the detected data, and thus the analytical instrument is suspected to be a dummy. Therefore, it is imperative to introduce reliable foreign advanced analytical techniques and instruments, especially sensitivity and reliability. The service life is higher than that of domestic products. Users should accept it and adjust its price.
Third, the calibration of the analyzer
As we all know, the analytical instrumentation belongs to the secondary transfer instrument of the magnitude. The accuracy of the instrument itself depends on the standard substance to adjust the scale. The same chromatograph is also calibrated by the standard substance. The calibration of the high-purity gas is very technical. Work is also a very complicated task. The accuracy of gas purity lies in the accuracy of the standard substance. First, the preparation of the standard substance is quite accurate, and then how to use the standard substance correctly. Whether it is pure gas or high purity gas detection and analysis instruments, it must be equipped with standard materials. For this reason, all localities should set up high-purity carrier gases that can often be used for standard materials and high-sensitivity chromatography. Advanced analytical instruments must have accurate reference materials. To set the standard, otherwise it will not reflect the role of its instrument, and it is difficult to ensure the daily operation of the instrument. The author believes that the introduction of advanced high-purity gas impurity component analysis instruments and meters must also consider the provision of standard materials to ensure the normal analysis of instrumentation.
Fourth, improve the rate of projection of analyzers in the air separation process and prospects
The configuration of the analytical instrument in the air separation process is a very technical work, which must not only meet the process needs reasonably, but also not be complicated, and it is necessary to reduce the investment and achieve the purpose of detection and analysis. Therefore, it is necessary to improve the utilization rate and the rate of submission of analytical instruments.
The cryogenic air separation technology has been greatly improved in recent years, and the online analytical instrument for monitoring process and the detection technology of the final product gas and liquid have also been greatly improved, especially for the control analysis technology. The gas purity requirements are becoming more and more strict, the number of impurity components to be analyzed is increasing, and the detection limit needs to be greatly reduced. Therefore, it is technically sought to improve sensitivity, stability, reliability, increase service life, and rational use of chromatographic techniques to reduce Analytical instrument investment costs, using multi-column, multi-identifier technology, adjustment of analytical instrumentation, in addition to the application of standard materials, also using dynamic correction methods, such as exponential dilution method, infiltration method or metering pump combination technology Due to the introduction of new foreign technologies, computers and online analytical instruments can be used to analyze the data of analytical information; on the other hand, supervise the performance of analytical instruments and control their actions and operating parameters, such as automatically correcting baseline drift. , reduce noise, automatically calibrate the scale and automatically control its working status, find faults, Adapt to the growing cryogenic air separation process, meet the detection of high purity gas purification process, and promote China's analytical technology to the world.
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