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1. High temperature molten salt operation method for air preheater
The key to high-temperature molten salt operation is to accurately control temperature, pressure, and equipment status in stages. Any negligence in any link may cause safety hazards. 1. Preparation for molten salt system inspection before startup: The connection of the molten salt pipeline, the opening and closing status of valves, the lubrication and lubrication of the pump, and the electrical system need to be verified one by one to ensure that there is no looseness or blockage. Confirmation of air preheater status: Focus on checking the integrity of heat exchange components, and ensure that the sealing device is rigorous and leak free. Instrument calibration: temperature and pressure sensors and flow meters shall be debugged in advance to the error ≤ 2%, so as to avoid false alarm leading to parameter misjudgment. two Temperature gradient control for molten salt heating and transportation: The initial heating rate should be strictly ≤ 50 ℃/h, and multi-point temperature measurement should be used to avoid local overheating and molten salt decomposition. Stability of transportation: If the current fluctuation of the molten salt pump exceeds 10% of the rated value, it should be stopped immediately for troubleshooting, and the outlet pressure should be maintained within the range of ± 5% of the design value. three Gradual loading during the operation of the air preheater: The molten salt inlet valve slowly opens at an opening rate of ≤ 5% per minute, and synchronously monitors whether the expansion of the shell is abnormal. Operation parameter matching: By adjusting several sections of the system through PID, closed-loop control of molten salt
2. What are the uses of steam from power plants to chemical plants?
Steam from power plants to chemical plants is mainly used for process heating, power drive, and system insulation, which can significantly reduce the energy cost and equipment investment of chemical plants.
The core use of steam in chemical production • Process heating: providing a stable heat source for reaction vessels, distillation towers, and drying equipment through steam heat exchangers, with a temperature control accuracy of ± 0.5 ℃ • Power drive: driving steam turbines to drive large equipment such as compressors and pump sets, with a single steam turbine power of over 20MW • Insulation and heat dissipation: maintaining the fluidity of materials in pipelines and storage tanks, preventing hig
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