The function of the vapor drum at the top of the synthesis tower
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As the title suggests: The function of the drum and its control methods
Adjust the temperature of the synthesis tower (Ruthite) to maintain normal operation of the synthesis tower. The liquid level in the air tank is maintained by adding demineralized water (high-pressure boiler feed water, as used in our plant), while the pressure in the air tank is controlled using a self-regulating valve. The steam generated is also sent to the steam distribution network through this self-regulating valve
The drum is an important component of natural circulation boilers and auxiliary circulation boilers, and it serves three functions: (1) storing a certain amount of water to increase the water volume in the evaporation system. To ensure the safety of the water cycle. (2) Perform steam-water separation and in-furnace chemical treatment. The drum is equipped with devices for steam-water separation, chemical dosing, and sludge discharge, which can effectively separate the steam-water mixture introduced from the rising tubes into steam and water. It also enables processes such as steam cleaning, continuous sludge discharge, and chemical dosing, in order to ensure that the output steam meets quality standards. Additionally, the drum is used for the chemical treatment of the boiler water. (3) Downcomers and risers of the superheater and evaporation heating surfaces. It ensures the continuous operation of water supply, steam output, and the water circulation in the evaporation heating surfaces. The steam drum is essentially a steam generator, and it represents a typical device used in the low-pressure process for methanol production in Germany. The conversion of syngas into methanol is an exothermic reaction, and copper-based catalysts have poor thermal stability. Therefore, strictly controlling the reaction temperature and removing the heat generated by the reaction in a timely and effective manner are key issues in the design and operation of reactors for low-pressure methanol synthesis. The Lurgi methanol synthesis reactor is a tubular isothermal reactor; the catalyst is placed inside the tubes, while high-pressure hot water from the steam drum flows through the shell side, absorbing the heat from the reaction to produce high-pressure steam. This high-pressure steam can be used as power to drive centrifugal compressors. By adjusting the steam pressure, it is possible to easily control the temperature of the reactor.
The synthetic drum differs from other drums in that, in addition to three-pulse control, it also features an important drum pressure control mechanism. Reason: The synthesis drum is designed to serve the synthesis tower. The main control parameter of the synthesis tower is the synthesis temperature, and the drum pressure controls this synthesis temperature.