In-depth application of pressure swing adsorption hydrogen purification technology in the metallurgical industry
2024-07-15
In iron and steel metallurgy, which is the main branch of the national heavy industry, technologies for separating and purifying gases involved in the production process are especially important. Among them, hydrogen purification is an integral part of the iron and steel metallurgy process. In recent years, with the continuous development of science and technology, pressure-pressure adsorption (PSA) technology has been widely used in the field of hydrogen purification due to the advantages of high efficiency, energy saving and environmental protection.
Overview of Pressure Swinging Adsorption Technology
In the metallurgical industry, hydrogen is mainly used to reduce iron oxide in iron ore to produce iron. However, during the preparation process, hydrogen often contains impurity gases such as nitrogen, carbon monoxide, etc., and the presence of these impurity gases affects the purity and efficiency of hydrogen use. Therefore, to obtain high-purity hydrogen, it is necessary to purify it using pressure swing adsorption technology.
Pressure swing adsorption technology is a gas separation and purification method based on the differences in the adsorption ability of adsorbents to gas molecules at different pressures and the differences in the adsorption ability of molecules of different types of gases. The basic principle of this technology is that at a certain temperature, using the property that the adsorption capacity of the adsorbent for certain gas components changes with pressure changes, and the property that the adsorption capacity for different kinds of certain gas components is different, the adsorption and desorption processes are carried out alternately by periodically changing the pressure in the system, thus achieving the purpose of gas separation and purification.
In a typical PSA process, two methods can be used to regenerate the adsorbent:
1. “Rinsing” the layer with product gas to reduce the partial pressure of adsorbed impurities and displace impurities that are more difficult to desorb. The advantage is that this can be done at atmospheric pressure. The disadvantage is the loss of some amount of product gas.
2.regeneration by vacuum pumping, so that the more difficult to desorb impurities under negative pressure are forced downwards, which is usually called Vacuum Pressure Swing Adsorption, abbreviated as VPSA or VSA. The advantages of the VPSA process are good regeneration effect and high product yield. The disadvantage is the need to increase the vacuum pump; the energy consumption of the device is relatively high.
In actual application process, which process to use mainly depends on the feed gas composition, conditions, flow rate, product purity, yield requirements, as well as plant capital and space and other decision circumstances.
Pressure Swing Adsorption (VPA) Hydrogen Purification Processes
The pressure swing adsorption hydrogen purification process mainly includes adsorption, pressure equalization, downward discharge, reverse discharge, flushing, pressure equalization, final pressure rise and other steps. Specifically it looks like this:
1.Adsorption: Raw hydrogen enters the adsorption tower under a certain pressure, in which the impurity gas is adsorbed by the adsorbent, and the high purity hydrogen enters the subsequent process through the adsorption tower.
2.Pressure equalization: After adsorption, the pressure in the adsorption tower is reduced to intermediate pressure through the pressure equalization step, creating conditions for subsequent reduction and reverse release steps.
3.Shunt release and reverse release: After equalizing the pressure, the impurity gases in the adsorption tower are partially released through the shunt release process, and then the impurity gases are further released by releasing the desorbed gases in the reverse direction through the reverse release process.
4.flushing: after the reverse discharge is completed, the adsorption tower is flushed with purer hydrogen gas to further remove residual impurity gases.
5.Pressure equalization and final pressure boost: After flushing, the pressure in the adsorption tower is raised to operating pressure through the pressure equalization and final pressure boost stages to prepare for the next cycle of the adsorption process.
Benefits of Pressure Swing Adsorption (VPA) Technology in the Metals Industry
1.High efficiency: Pressure swing adsorption technology has high separation and purification efficiency, advanced and reliable process, wide applicability to raw materials, can produce high purity hydrogen in a short time, the purity can reach 90-99.9999%, and improve production efficiency.
2.Energy saving: Compared with traditional deep cooling separation technology, pressure swing adsorption technology has significant advantage in energy consumption. The operating temperature is close to normal, which avoids large energy consumption in the deep cooling separation process. Wide pressure range: 0.2-6.0MPaG, low power consumption, operating flexibility up to 20-120%, device continuous operation time more than 3 years.
3.Environmentally friendly: Pressure swing adsorption technology does not produce hazardous waste during the purification process, and the hydrogen recovery rate is high. Depending on the gas source and production conditions, the hydrogen recovery rate is 60-99%. It meets the requirements of "green" production.
4.Flexibility: Pressure swing adsorption technology can adjust the adsorbent and process parameters to meet different production requirements, with high adaptability and flexibility. The device has a high degree of automation, with self-adaptive setting, automatic fault diagnosis and other functions, it is convenient to start and stop the installation, and unmanned automatic control has already been realized.
Industrial Value and Market Outlook
At present, VRS technology is widely used in conversion gas, methanol cracking gas, methanol release gas, synthetic ammonia tail gas and refinery hydrogenation low gas,
When the gas from the impeller casing is ejected to the periphery at the same time, a low pressure area is formed in the impeller casing, causing the gas to be sucked into the impeller casing. Depending on the continuous operation of the impeller, gas is continuously drawn in and expelled. The mechanical energy gained by the gas in a centrifugal vacuum pump ultimately results in an increase in static pressure energy.
Technical advantages of high efficiency centrifugal vacuum pumps
Compared with traditional vacuum pumps, high-efficiency centrifugal vacuum pumps have faster pumping speed and lower energy consumption, making industrial production more efficient and environmentally friendly, and can be customized and optimized according to different needs and suitable for various special conditions and process requirements.
l High Energy Efficiency: High efficiency centrifugal vacuum pumps have higher pumping speeds, lower ultimate pressures and excellent gas handling capabilities, allowing you to quickly achieve the required vacuum level, greatly improve operating efficiency and meet the needs of a variety of complex processes.
l Low energy consumption: Through precise fluid mechanics analysis and optimized control system, the high-efficiency centrifugal vacuum pump adopts advanced energy-saving technology and environmentally friendly materials, which can reduce energy consumption and noise while maintaining high performance and reduce environmental pollution, which not only promotes energy saving and emission reduction, but also reduces the operating costs of enterprises.
l High stability: The high-efficiency centrifugal vacuum pump technology uses high-quality materials and advanced manufacturing process, which improves the wear resistance, corrosion resistance and service life of the pump, and ensures the stability and reliability of the pump. Whether in continuous or intermittent operation, it can maintain stable vacuum levels and performance, reducing the risk of maintenance and failures.
l Intelligent control: Chengdu Yizhi Technology has equipped its high-efficiency centrifugal vacuum pump with an intelligent control system, which provides automatic control and remote monitoring. Operators can set parameters and monitor in real time through a simple interface, which improves operating convenience and safety.
Technological breakthrough of Chengdu Yizhi Technology
Chengdu Yizhi Technology has made important breakthroughs in the development of high-efficiency centrifugal vacuum pumps, mainly in the following fields:
Innovative Design: Through in-depth study of fluid dynamics and thermodynamics, Chengdu Yizhi Technology has optimized the pump structure and impeller design to improve pump efficiency and performance.
Advanced Materials: Chengdu Yizhi Technology's high-efficiency centrifugal vacuum pump technology uses advanced materials and manufacturing processes such as high-strength alloys and precision casting technology, which enables the pump to withstand higher operating pressure and temperature, and extends its service life.
Intelligent technology: By introducing advanced sensors and control systems, Chengdu Yizhi Technology monitors and automatically adjusts the pump in real time. This allows not only potential problems to be detected early, but also operating conditions to be adjusted according to the actual situation, ensuring stable operation and efficient pump performance.
Personalized service: Chengdu Yizhi Technology provides customized solutions for high-efficiency centrifugal vacuum pumps according to customers' various needs and application scenarios. Whether it is special gas processing or special processes, individual design and optimization solutions are offered.
Application areas of high efficiency centrifugal vacuum pump technology
Chengdu Yizhi Technology high-efficiency centrifugal vacuum pumps have the advantages of compact structure, high efficiency, low noise, etc., and are widely used in chemical industry, electric power, environmental protection and other industries, bringing great convenience to various industries.
Scientific research: In laboratories and research institutions, high-efficiency centrifugal vacuum pumps are used to provide a stable vacuum environment to support a variety of precision experiments and research.
Industry: In the semiconductor, chemical, petroleum and other industries, high-efficiency centrifugal vacuum pumps are used to handle industrial gases to keep the production process running smoothly.
Medical field: in medicine
