Chemical process strengthening from multiple levels of innovation
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During the meeting of the Petroleum and Chemical Industry in Inner Mongolia Autonomous Region held last week, Prof. Fei Weiyang, an academician of the Chinese Academy of Sciences who was invited to the meeting, explained to reporters: The development of the discipline of chemical engineering and the economic and social development in China both urgently need to strengthen process enhancement and process innovation. .
Energy-saving and emission-reduction strengthens the chemical process. Academician Fei Weiyang proposed that the chemical industry is of great significance to the development of energy, resources, environment, agriculture, and high-tech. However, there are problems of high material consumption, high energy consumption, and high pollution, so energy conservation and emission reduction Very important.
Chemical process enhancement is the use of smaller, cheaper, and more efficient equipment and processes to replace large, expensive, energy-intensive equipment or processes, or to replace multiple devices with fewer (or single) devices. Under the premise of achieving the established production goals, the factory layout is more compact and reasonable, the unit energy consumption is lower, and the waste and by-products are less, by greatly reducing the size of the production equipment and reducing the number of devices.
Chemical process enhancement includes two aspects: new equipment and new process: First, the strengthening of production equipment, including new reactors, new heat exchangers, high-efficiency packing, new types of trays, etc.; Second, the strengthening of the production process, such as the coupling of reaction and separation (Reaction distillation, membrane reaction, reaction extraction, etc.), coupling of the separation process (membrane absorption, membrane distillation, membrane extraction, etc.), external field effects, and other new technologies.
New technologies have been added to accelerate the strengthening of chemical processes. Information technology plays an extremely important role in strengthening chemical processes.
Taking the chemical separation process as an example, molecular modeling has greatly improved the level of thermodynamic equilibrium and transfer properties predicted. Molecular design accelerates the development of highly efficient separating agents. The commercialization of chemical simulation software has greatly promoted the optimization design and optimization control of the separation process and equipment. The application of unbalanced model is more extensive. This new model abandons the traditional model and directly uses mass transfer and heat transfer rate equations to characterize the transfer process between the two phases. It is suitable for the separation process of multi-component systems. The full-featured CFD (Computational Fluid Dynamics) software can accurately calculate and describe the flow field in the separation device, deepen people's understanding of the mechanism of phase transfer process, and provide important information for equipment enhancement and amplification. Advanced testing technologies such as LDV (Laser Doppler Velocimetry) and PIV (Laser Imaging Velocimetry) applications have made research from macroscopic, average to microscopic and instantaneous development, providing conditions for multi-level and multi-scale research in chemical industry. Provides a powerful tool for strengthening the chemical process.
In addition, Internet-based process simulation systems are also rapidly developing. This technology has been applied to coupled separation technologies such as catalytic distillation, membrane distillation, adsorption distillation, and the like.
Multi-level technological innovation Constantly improving the innovation system Academician Fei Weiyang emphasized that China's innovation system has shifted from simply emphasizing original innovation to emphasizing the current innovation system. The innovation system includes three aspects: first, original innovation, second, integrated innovation, and third, digestion, absorption, and re-innovation of foreign introduction technology.
For example, in recent years, China has introduced a number of large-scale petrochemical sets of technologies and devices, such as synthetic ammonia, ethylene, reforming, aromatics extraction, and caprolactam, which have played an important role in accelerating the pace of China's chemical industry modernization. With the advancement of technology and the passage of time, there are gaps in the technical and economic indicators of many imported devices compared with the advanced level in foreign countries, and they need to be reformed.
The problem of repeated introduction in our country is also very serious, and it is urgent to strengthen the digestion and absorption and use of high and new technology to upgrade its level of technology and equipment.
Fei Weiyang believes that the development of a resource-conserving and environment-friendly economy, the digestion, absorption, and re-innovation of imported technologies all require strengthening process and process innovation. The development of chemical engineering theory, computational techniques, and test techniques provide powerful tools for process-enhanced research and applications.
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