On-line Analytical Instrument Development Status Analysis

Water quality online analysis instrument and system

Due to the requirements of environmental protection, online water quality analysis instruments and systems have become the main means for the environmental protection department to monitor the water quality of the area in real time, and have been able to provide accurate and rapid monitoring data in real time, continuously, stably, and reliably. As an automatic monitoring of water quality, remote monitoring is also required to control the water quality of key water bodies in key river basins, early warning and forecast of major or water quality water pollution accidents, resolution of water pollution accidents across administrative areas, supervision of total control, and discharge compliance. Other purposes. In the water quality automatic monitoring system network, the central station realizes real-time monitoring of the substations through satellite and telephone dialing. The escrow station can also realize real-time monitoring of the substations it administers through telephone dialing. Each substation is authorized to be an independent water quality automatic monitoring system. Generally, substations have one or more multi-parameter water quality automation analyzers, and there are also fixed substations and mobile substations (tow-monitoring sheds). Three kinds. The substations are divided into water collection units, water distribution units, analysis units, control units, substation stations and supporting facilities.

Domestically, many achievements have also been made in the in-depth study of water quality ammonia nitrogen monitoring and other complex instruments. For example, the Beijing Chemical Industry Research Institute has developed a highly automated intelligent analysis system, which provides a powerful monitoring tool for environmental management. At present, there are more than 30 companies in China that have certified relevant products, which were also promulgated in 2003 in China. The "Ammonia Nitrogen Water Quality Automatic Analyzer Technical Requirements" (HJ/T101-2003) standard specifies the technical performance requirements and performance tests of the ammonia nitrogen water quality automatic analyzer based on electrode method and spectrophotometry for surface water, industrial sewage and municipal sewage. method.

Gas online analysis instrument and system

From the perspective of environmental protection, gas on-line analysis instruments and systems are more important than on-line water quality analysis instruments and systems. The emission standards for air pollutants, etc., require the installation of a continuous emission monitoring system CEMS. In the past ten years, 18,000 sets of CEMS have been installed in China's fixed pollution sources. The specific standards include the HJ/T75 continuous pollution source emission monitoring technical specifications, the HJ/T76 fixed pollution source emission continuous emission monitoring system technical requirements and detection methods, and HJ. / T212 pollution source online automatic monitoring (monitoring) system transmission standard.

At present, it has also tried to ignite the continuous automatic monitoring of mercury in the flue gas emitted from coal-fired power plants. Ultrasonic flow velocity analyzers have been used to solve low-velocity (<=3m/s) flue gas measurements and to adapt to specific techniques for measuring gas concentrations in a wide range. In addition, an innovative cold-dry straight-extraction CEMS sample pretreatment technology provided by U.S. Bochun is a good technology for sample gas dehumidification. The transition from "point-to-point monitoring" to "overall process monitoring" is achieved, and the copyright of laboratory engineering projects such as laboratory testing items and portable instrument testing items are coordinated to meet the requirements of ecological civilization under the new situation.

In order to meet the needs of environmental protection, the Ministry of Environmental Protection has revised the "Ambient Air Quality Standards" and listed PM2.5 as a basic environmental air monitoring project. Conditional cities have conducted monitoring of PM2.5. Most of the monitors used today are imported foreign products. To this end, domestic companies such as Qingdao Jiaming monitoring and control company also carried out development. The international monitoring methods include the micro-oscillation balance method and β-ray method. The β-ray method is divided into real-time methods and time-average methods according to different output methods. Qingdao Jiaming Measurement and Control Company adopts the real-time display method of β-ray method. The company has solved the counter selection and data processing, and other applications in the oil refining, petrochemical and chemical industries are becoming more and more popular in the refining, petrochemical industry, online analytical instruments, and investment has been increasing. According to the data provided by Xie Huairen and Shi Yanqiu of Sinopec Consulting Company, the cost of a large-scale ethylene plant with imported automatic control instrumentation is 200 million yuan, and the cost of imported online analytical instrumentation is 50 million yuan, ie 4:1; a large-scale polyethylene plant is imported. Self-controlled instrumentation equipment costs 80 million yuan, imported online analytical instrumentation equipment costs 17 million yuan, including far infrared total hydrocarbon analyzer 5 million yuan, online gas chromatograph 5 million yuan, oxygen analyzer 4 million yuan, water analyzer 3 million Yuan, that is, 4:0.85; a large-scale sulfur recovery device, imported automatic instrumentation equipment costs 5 million yuan, imported online analyzer equipment costs 2.5 million yuan, that is 2:1; an oil product long-distance transmission pipeline distribution station, imported automatic control instruments The equipment cost is 2 million yuan, and the cost of imported online analyzer equipment is 1 million yuan, ie 2:1. On-line analyzers mainly focus on the following aspects: online quality analyzers (industrial chromatography, full-scale analyzers, mass spectrometers, etc.), on-line near-infrared analyzers, industrial nuclear magnetic resonance instruments, radioactive instruments (material density measurement), and Environmental monitoring and water quality analyzer.

Kenneth Loh’s “On-Line Analysis Technology for Oil Refinery Processes to Improve Oil Quality and Light Oil Yield” of the KONE Automation Control Technology Company summarized the on-line analysis of oil quality. The main products are online gasoline analyzers, On-line analyzers for pour point, on-line analysis of saturated vapor pressure, on-line viscosity analyzers, flash point on-line analyzers, and other oil quality analysis instruments, as well as various types of oil pretreatment systems, analysis huts and analytical instrumentation systems, and remote workstations. In Lanzhou Petrochemical, Xinjiang Karamay, Tianjin Dagang Petrochemical, Dalian Petrochemical, Huabei Petrochemical, Hunan Changling Petrochemical, Guangzhou Petrochemical, Shanghai Gaoqiao Refinery, Shaanxi Yulin Petrochemical, Luoyang Petrochemical, Hebei Zhuozhou Petrochemical, Shandong Jinan Petrochemical, Xi'an Petrochemical, Xinjiang Dushanzi Petrochemical, Wuhan Petrochemical, Jiangsu Qingjiang Petrochemical, Yanan Refinery and other 30 oil refining companies have been well applied. For example, the Wuhan Petrochemical Coking Diesel Project carries out a card edge operation. 95% of the diesel fuel is advanced from 357°C before commissioning to 363°C after commissioning, with an average increase of 6°C. It is calculated at 6.8 million RMB per 1°C increase. % points have increased by 6°C and annual economic benefits have increased by more than RMB 35 million. Luo Xiangsheng, a refinery hydrocracking plant of Dushanzi Petrochemical Company, pointed out in the article “Application of full-flight on-line analyzer in hydrocracking unit” that the 600,000 hydrocracking unit of the plant adopts IDA series full-flight on-line The analyzer (KONE products) was commissioned at the end of October 2011 and was officially put into use on January 15, 2012. So far, it has been operating smoothly, realizing on-line quality monitoring of the production process and optimizing control of the entire tower. The annual economic benefit is 15,193,000 yuan.

Application in medicine and food industry

The demand for on-line analytical instruments and systems in the pharmaceutical and other industries is similar to that in the petrochemical and other industries from the perspective of PAT process analysis technologies, especially the monitoring and control of process equipment such as towers, kettles, and tanks, combustion, and cooling, and energy saving and environmental protection. The requirements, etc., are not special, but the post-processing part of the pharmaceutical process, such as the measurement and control of the drying process of pellets and pills, on-line analytical instruments and systems are still in use. Dong Haiping, Jinan Jin Hongli Industrial Co., Ltd. described the control of water content and humidity in the drying process of pellets and pills in the article “On-line Measurement of G/att Fluid Bed Humidity by AOTF-NIR Spectroscopy Technology”. As the main method of humidity control in the modern pharmaceutical field, fluidized bed spray granulation is a complex production process. The moisture content of the material changes greatly, and the accurate detection of the humidity and internal humidity of the drug particle table is a problem. Near-infrared (NIR) reflectance spectroscopy was used for fluid bed dry granulation, the spray stage was monitored and the drying endpoint was determined. The near-infrared spectroscopy maps of products at different stages of drying are collected through on-line infrared technology, and a linear calibration model is established in combination with other process measurement techniques to monitor the drying process in real time. Specific use of luminar3075 small AOTF-NIR spectrometer (Brimrose Corporation, United States), AOTF is acousto-optic tunable filter (Acousto-optictunablefilter), a simple structure, the optical system has no moving parts, small size, light collection ability, fast wavelength switching The reproducibility is good, and the programmed wavelength control makes it flexible and widely used in the field.

Conclusion

The development of on-line analytical instruments and systems in the application is just at the right time. In particular, CEMS has led to the emergence of a large number of private enterprises and is forming an industry. Online analytical technologies (PAT) should be made up of manufacturers, design institutes (research and design institutes), The end-users cooperate and work together to make it produce huge economic and social benefits. With the spirit of openness and under the backdrop of international cooperation, we can practically increase the quality, variety, and innovative work with independent intellectual property rights.

Now more people talk about sensors. Actually, online analytical instruments are one of the sensors. With more sampling methods, modularization, miniaturization, and intelligence, online analytical instruments and automated instruments will no longer be separated. Now. During the Twelfth Five-Year Plan period, we should take advantage of the east wind of the sensor, first to catch up with online physical property analyzers and online electrochemical analyzers.