A single variety of complex chemical consumer equipment, tower is one of the most common type of processing and installation. Tower is the place of consumption processing is the storage of materials into and out of the container, so the level of material in the tower to stop testing. Depending on the consumption process, towers up to a few tens of meters tall with a very large gap are within one meter and the tower exterior usually passes through a number of different spaces in the tray and packing structure to stop the different connections between the materials Processing and storage, so a tower often need to install a number of liquid level measuring instruments, the level of instrument operation is directly related to the consumption of the operation or even the safety of the tower. Float ball level gauge is a purely mechanical level detector, due to its measurement of indirect indirect device in the device outside the tower, has been in the erosion of the measured medium erosion, poor external environment devices, which need to ensure that the float level Local measurement of reliable quality, in the process of overhaul to assemble careful reflection. Routine maintenance Mainly in the tower part of the internal level gauge, good maintenance can extend the service life of the float level gauge to increase the incidence of defects. This article introduced the vacuum tower as the main body of the vacuum tower lack of consideration of the liquid level measurement environment and the effect of design results or float device flange hole design is too high, Ball stuck in the oil tank platform, the practice of invalid measurement range is too small, and as a result of corrosion caused by the floating ball scattered results. For the decompression tower float level related results to stop the targeted large-angle transformation, material quality, card sets of tank cutting slot patch transformation, to complete the vacuum tower liquid level fluctuations and the purpose of precision operation.
1 results status
A refinery installation 3.5Mt / a constant pressure to stop the processing of high-acid crude oil compliance transformation, after two major overhauls in 2012 and 2015, since the two operating cycles, the depressurization tower sidelines set the tank level measurement continues to exist , Failed to deal with invalid. Secondary results include: Float device Flanged hole design position is too high, the float stuck in the oil tank platform, the practice is invalid Measuring range is too small and local float poor lack of performance. In particular, as long as the four-pass over-liquefied oil overflow tank only 140mm, while the float diameter is 240mm, easy to float in the fuel tank set on the stage, even after the full liquid level overflow will not be displayed in the instrument. Vacuum tank in the tank level control of the quality of the quality of each side have a great impact. If the side distillate increases, the vacuum distillation tower finally returned to the bottom of the bottom of the evaporative oil, the bottom of the residue increases, the bottom of the liquid level changes will inevitably lead to changes in residue liquid, affecting the heat exchange temperature of crude oil, and thus Affect the entire installation. Therefore, to maintain the depressor tower on each side of the tank level fluctuations and ineffective precision of the operation is to ensure that the pressure relief tower material balance and improve the economic efficiency of the important means.
2 large corner float design principles and characteristics
Float level gauge secondary by the float body, flange, the central axis, cooling components, the balance hammer mechanism, universal joints, transmission agencies and other components. Used to measure low temperature, high viscous medium, when the liquid level changes, the buoyancy changes with the buoyancy, the amount of change by the lever, the central axis to the resistance sensor, the circuit module processing into a linear change with the liquid level 4 ~ 20mA current signal input. Ordinary float level gauge is usually limited by the swing angle fulcrum position and the neck diameter and length of the device, the maximum operating angle of 35 °, the large floating ball at the base of the ordinary 35 ° added a set of connecting rod mechanism design , After the fulcrum forward, you can float the operating angle of 80 °, a substantial increase in the liquid level measurement range.
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