The upsizing of air separation plant has became an inevitable trend of the development of national economy. A few years ago, the domestic air separation industry had achieved the air separation performance of 100000 m³/h level, and there were more than 150000 m³/h air separation plant abroad. With the gradual increase of the scale of air separation plant, its energy consumption is also increasing. In order to save energy, reduce consumption and reduce pollution, it is of great significance to study the driving mode of compressor for large-scale air separation plants.
1.Turbine drive:
Steam turbine is widely used in electric power, chemical industry, metallurgy and other industries and fields because of its axisymmetric high-speed rotation characteristics, smooth operation, small wear and long continuous operation time. However, the one-time investment of steam turbine drive is relatively large, and the requirements for heat supply pipeline and production system are high. The plant production cycle is long, the installation and commissioning and the start-up and shutdown process of the whole system are relatively complex, and the boiler emission also has certain pollution to the environment. In general, large air separation plants are driven by steam turbines.
2.Motor drive:
Motor is an indispensable rotary driving plant in the industrial production process. It covers all production links of the industrial industry with the advantages of stable operation, simple start-up and stop control, and short production cycle. And the motor installation is relatively independent, which can ensure the construction cycle. However, the high-power motor start-up requires higher grid conditions, which is easy to affect the surrounding plant. At present, there are many air separation plants under 35000 m³/h level which are driven by motor.
