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I. Current Status of Production and Quality Monitoring in the CO2 Industry in China Before and after 1989, the purity of domestically produced carbon dioxide products was only 99%. The purity of the main components was determined using only classical chemical absorption methods and simple equipment and operations. There are only three types of impurity components that are monitored and controlled (with specific content specifications). In the ten years after the international standards and the newly revised targets, there are clear content technical indicators, and it is necessary to monitor and control the impurity components to more than 20 kinds. To achieve the monitoring objectives set by the standard, it will take a lot of money to purchase equipment and equipment, and also to train qualified technical personnel to master and apply these instruments and equipment. In terms of the establishment of carbon dioxide production and quality monitoring systems, the status of most production enterprises still remains at the level before the 1990s. Many companies lack inspection equipment and equipment. When there is a demand for inspection, the relevant units are commissioned to conduct temporary sampling inspections; some companies purchase domestically-made or imported air separation equipment, but they may not meet the actual monitoring requirements. Unsatisfactory, the instrument can not play its due role; Some companies want to purchase instruments to establish advanced gas analysis laboratory, in order to improve the market competitiveness of the company's products, but suffer from lack of information, I do not know how to solve the instrument Selection, debugging and application of a series of issues.
In general, the selection and application of gas analysis methods and equipment in the CO2 industry in China are still far behind that of similar foreign companies. This gap has seriously affected the development of carbon dioxide production technology and the improvement of product quality in China. After the introduction of the newly revised international standard, this issue has to be mentioned on the agenda.
II. Requirements for CO2 production on gas analysis instruments 1. Category requirements for monitoring projects In general, a large and medium-sized CO2 production facility needs to complete the following monitoring projects:
(1) Analysis of raw materials. That is to say, the analysis of the mixed gas from different raw materials will clarify which kinds of components in the raw material gas, including the constant and trace gas components, to ensure that the production process can fully adapt to the performance characteristics of the raw materials. In addition, in the event of changes in the composition of the raw gas, timely adjustment of the process operations and the addition or subtraction of certain types of equipment to ensure normal production and product quality standards.
(2) Production control analysis. That is, continuous monitoring or regular tracking analysis of certain gas component contents at various inspection sites affecting the process and product quality in the production process of carbon dioxide provides production operators with necessary component quantity data to ensure the normal production process and products. stable quality.
(3) Product quality inspection. That is, the final product quality inspection and appraisal, on the one hand to ensure the quality of the products provided for the market, on the other hand, the product quality information can be reversed to find the production process and equipment problems.
2. Requirements for monitoring methods (1) Online continuous monitoring (ie online analysis). Usually used for production control analysis. In order to stabilize the production process and effectively ensure the product quality, it is often at the important stage of the production process that the 24-hour continuous monitoring and analysis of certain component quantities that affect the stability of the production process is performed, and the component quantity data are given at any time by the instrument for production. The operator adjusts the process for stable production operations. Moreover, this kind of data is intuitive, has a clear purpose and can play the role of “eyes†for production personnel.
(2) Random (timed) sampling analysis (ie off-line analysis). Usually used for occasions where continuous monitoring is not required for 24 hours. For example, the analysis of raw material quality and product quality is generally based on the premise of stable production, and does not require continuous measurement, but can be randomly sampled and analyzed when needed. According to actual needs at any time to take samples for analysis.
In summary, the demand for gas analysis instruments for carbon dioxide production can be broadly divided into online analysis and off-line analysis. As a carbon dioxide production enterprise, it is necessary to have both types of analytical instruments, and a complete gas analysis and detection system is composed of these two types of analytical instruments. Only in this way can the normal operation of production and the improvement of product quality be effectively ensured.
It should be noted that these two types of analytical instruments are complementary to each other to form a complete gas analysis system. Therefore, they are indispensable. However, it does not necessarily require a large number of instruments, but the instrument configuration must be complete and must be based on the actual needs of the company.
Third, establish and improve the gas analysis system marks what is known, product quality is the lifeblood of production companies. Measuring the production level and management level of a production enterprise often depends on the analysis of the setting and level of the monitoring system. This is a law and a habit.
When we inspect foreign gas production plants, one of their key aspects is to analyze the supporting and application levels of monitoring and inspection instruments. When senior leaders inspect an air separation company, in addition to understanding the situation outside the production equipment, the focus is on the supporting setting of the analysis and monitoring system instruments. Why is this?
This is because: Only by analyzing the selection and application level of the instruments in the monitoring system, can fully demonstrate and reflect the overall quality and level of an enterprise's production and management. It can be said that the analysis of data is a window of perspective of enterprise management, process conditions and product quality. Therefore, this analysis system can also be regarded as a sign of the good or bad work of a production company in many aspects. Specifically speaking:
It is an important symbol of the stability of the production process. Without a certain number of reasonably matched and well-applied on-line analytical instruments, the stable operation of gas production is impossible to achieve.
It is an important symbol for achieving total quality management. Without a perfect analysis and detection system, there is a lack of necessary supervision, inspection, and assurance measures for gas production. It is impossible for manufacturers to achieve total quality management.
It is an important symbol of product variety and quality level. Without a perfect analysis and detection system and corresponding equipment and equipment, product types and quality levels are unlikely to be guaranteed and improved, and users cannot purchase.
It is an important indicator of the level of management of corporate leaders. Without a perfect analysis and detection system, it lacks the preconditions for ensuring the stable production of the process, and it also loses the effective means for stabilizing and improving product quality, and total quality management falls into empty talk.
4. Try to improve the awareness of the leaders and managers of the company on the analysis and monitoring system. 1. Leaders pay attention and raise their awareness. If we want to do a good job in the establishment and improvement of the analysis and detection system, leadership is the key. In modern large and medium-sized production enterprises, the leaders and managers must possess the mode of thinking of modern enterprise management in order to manage the enterprise well and make it develop along the direction of modern enterprises, so that this enterprise is in a favorable position in the market competition. In fact, modern companies require leading cadres and managers to stand higher and see farther, and be able to fully learn and use the various effective means provided by modern science and technology in order to do a good job in production and management. The kind of detection methods that rely solely on the eyes, touching, hearing with the ears, using classical simple methods to conduct rough analysis, and the mode of production and management relying on the narrow experience of a few people in the era of planned economy, develop in the market economy. Today, in the new era of rapid development of science and technology, it has long been a management method that should be corrected and abandoned.
2. Several measures for the construction of an analysis and detection system. For a set of gas production equipment, it is necessary to do the following well in the construction of the analysis and monitoring system:
(1) According to the actual needs of the production of this system, the general objectives and specific technical indicators of the gas detection task that must be completed in accordance with the overall quality management of the enterprise are proposed.
(2) According to the actual needs of the system, reasonably supporting and purchasing the appropriate number and type of gas analysis instruments.
(3) Select technical personnel and instrument operators with certain professional qualities to conduct technical training, and improve their application technology level after a period of instrument application practice to meet the needs of the enterprise.
(4) Do a good job of instrument application. It should be pointed out that the application of instruments (especially trace gas analysis) is a kind of work with research properties and it is technically difficult. In general, only through careful practice for at least a few years can the technicians responsible for the application of the instrument truly grasp the microanalysis techniques and methods. Therefore, corporate leaders should make appropriate arrangements for this, and only in this way can the instrument application work be gradually completed.
In recent years, due to the widespread application of carbon dioxide to food additives, the demand in the international market has been rapidly expanded, resulting in the rapid development of food-grade carbon dioxide production. On the other hand, due to the increasing attention to human health, the quality requirements for carbon dioxide have also greatly increased. According to the international food-grade carbon dioxide standards and the new food-grade carbon dioxide standards revised by China, the monitoring and control of impurities in carbon dioxide products has increased from a few in the past to more than 20, and the amount of impurities monitored and controlled is also greatly increased. The gas content of some impurities dropped below 20 ppb. Therefore, this raises new issues for carbon dioxide production and quality management.
April 25, 2023