With the rapid development of China's economy, the task of energy saving and emission reduction is very urgent. As a chemical industry with large energy consumption and large waste discharge, how can we use energy saving technologies to tap energy saving potential and push energy conservation to a new height? ? In this regard, Wang Jian, vice president of Yunnan Chemical Industry Association, has his own experience.
Reporter: What aspects of chemical production can be saved through technology?
Wang Jian: Technical energy saving mainly includes chemical process energy saving, chemical unit operation equipment energy saving, chemical process system energy saving and process control energy saving. Among them, chemical process energy saving is mainly improved through a variety of measures such as selection of production process, choice of catalyst, selection of reaction engineering, choice of separation project, and improvement of process methods. The energy saving of the chemical unit operating equipment is achieved through the effective energy saving of fluid transport machinery, heat exchange equipment, evaporation equipment, tower equipment and drying equipment. The energy saving of the chemical process system refers to the energy-saving work of the entire system related to the conversion, recovery, and utilization of energy in the production process from the perspective of the rational energy use of the system.
Previous energy conservation efforts focused on individual unit energy saving. With the development of process systems engineering and thermodynamic analysis and their mutual integration and penetration, theories and methods for energy saving of process systems have been created, and energy conservation has been pushed to a new height. Doing a good job of energy saving in the process will have bright prospects.
Reporter: How to carry out energy saving in the chemical process system?
Wang Jian: I think the energy saving of the chemical process system focuses on the following three aspects: First, the entire process is reasonably configured. In general, the entire process includes energy supply, energy conversion, energy utilization, energy recovery, and energy loss. It is a systematic project to reasonably match the entire process, and it needs the research and balance of energy-saving workers. The second is the use of energy classification and comprehensive utilization in system engineering. The third is to recycle low energy. For example, the outlet temperature of Lurgi's furnace in Yunnan Dehua Group is less than 200°C, but the gas has a large amount of steam and the value of thorium is very high. In the past, a large amount of cooling water was used to cool the gas, and now waste heat boilers have been used. Although the produced steam grade is low, it can be used in the ammonia absorption refrigeration of low-temperature methanol elution carbon instead of electric ice-driven machines, giving full play to the characteristics of the chemical industry.
Reporter: How to better achieve process control and energy conservation?
Wang Jian: On the one hand, process control energy-saving requires operation and control, and on the Other hand, energy conservation is controlled through operation. Energy-saving measures need to be enhanced through metering, energy accounting and energy analysis. In particular, after energy-saving reform, various waste heats are recycled and reused. The mutual connection and mutual influence between logistics and logistics, equipment and equipment have increased, making the operation elasticity smaller, and requiring the use of a control system to avoid accidents. .
In addition, in order to do a good job of energy saving in production, the entire process must be run under optimal reaction conditions and optimal parameters, so as to ensure that the product quality does not exceed the quality surplus, and there is no unqualified product. Therefore, the use of DCS control system by modern workers is very necessary. It is particularly important for computer control of coal chemical and nitrogen fertilizer companies.
Reporter: What is the impact of production scale on energy saving and consumption reduction?
Wang Jian: Adjusting production scale is also an important way to save energy and reduce consumption. Large-scale enterprises with large-scale equipment in the chemical industry generally have lower energy consumption than small- and medium-sized enterprises. Chemical companies should choose economic scale equipment when they are newly built. For coal chemical and petrochemical companies, scale is an important factor in determining corporate efficiency and energy consumption, so we will limit and oppose new small coal chemical companies. However, I personally think that the scale effect must also be adapted to local conditions. The bigger the better, the moderate scale will be the key to taking into account the energy consumption of enterprises and social energy consumption.
Reporter: What aspects of chemical production can be saved through technology?
Wang Jian: Technical energy saving mainly includes chemical process energy saving, chemical unit operation equipment energy saving, chemical process system energy saving and process control energy saving. Among them, chemical process energy saving is mainly improved through a variety of measures such as selection of production process, choice of catalyst, selection of reaction engineering, choice of separation project, and improvement of process methods. The energy saving of the chemical unit operating equipment is achieved through the effective energy saving of fluid transport machinery, heat exchange equipment, evaporation equipment, tower equipment and drying equipment. The energy saving of the chemical process system refers to the energy-saving work of the entire system related to the conversion, recovery, and utilization of energy in the production process from the perspective of the rational energy use of the system.
Previous energy conservation efforts focused on individual unit energy saving. With the development of process systems engineering and thermodynamic analysis and their mutual integration and penetration, theories and methods for energy saving of process systems have been created, and energy conservation has been pushed to a new height. Doing a good job of energy saving in the process will have bright prospects.
Reporter: How to carry out energy saving in the chemical process system?
Wang Jian: I think the energy saving of the chemical process system focuses on the following three aspects: First, the entire process is reasonably configured. In general, the entire process includes energy supply, energy conversion, energy utilization, energy recovery, and energy loss. It is a systematic project to reasonably match the entire process, and it needs the research and balance of energy-saving workers. The second is the use of energy classification and comprehensive utilization in system engineering. The third is to recycle low energy. For example, the outlet temperature of Lurgi's furnace in Yunnan Dehua Group is less than 200°C, but the gas has a large amount of steam and the value of thorium is very high. In the past, a large amount of cooling water was used to cool the gas, and now waste heat boilers have been used. Although the produced steam grade is low, it can be used in the ammonia absorption refrigeration of low-temperature methanol elution carbon instead of electric ice-driven machines, giving full play to the characteristics of the chemical industry.
Reporter: How to better achieve process control and energy conservation?
Wang Jian: On the one hand, process control energy-saving requires operation and control, and on the Other hand, energy conservation is controlled through operation. Energy-saving measures need to be enhanced through metering, energy accounting and energy analysis. In particular, after energy-saving reform, various waste heats are recycled and reused. The mutual connection and mutual influence between logistics and logistics, equipment and equipment have increased, making the operation elasticity smaller, and requiring the use of a control system to avoid accidents. .
In addition, in order to do a good job of energy saving in production, the entire process must be run under optimal reaction conditions and optimal parameters, so as to ensure that the product quality does not exceed the quality surplus, and there is no unqualified product. Therefore, the use of DCS control system by modern workers is very necessary. It is particularly important for computer control of coal chemical and nitrogen fertilizer companies.
Reporter: What is the impact of production scale on energy saving and consumption reduction?
Wang Jian: Adjusting production scale is also an important way to save energy and reduce consumption. Large-scale enterprises with large-scale equipment in the chemical industry generally have lower energy consumption than small- and medium-sized enterprises. Chemical companies should choose economic scale equipment when they are newly built. For coal chemical and petrochemical companies, scale is an important factor in determining corporate efficiency and energy consumption, so we will limit and oppose new small coal chemical companies. However, I personally think that the scale effect must also be adapted to local conditions. The bigger the better, the moderate scale will be the key to taking into account the energy consumption of enterprises and social energy consumption.
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