Gaoqiao Petrochemical strengthened equipment anti-corrosion online monitoring and control
Gaoqiao Petrochemical strengthened the online monitoring and control of equipment anticorrosion. In August this year, it was found that the No. 3 distillation constant-top air cooling-the body's outlet thinned significantly; in October, it was found that the No. 1 distillation constant-top condensing and cooling process had serious corrosion; During the re-test, it was found that the No. 1 distillation constant-top heater outlet leaked oil at the welding area last year. Three times, the hidden corrosion of the equipment was found in time to avoid further expansion of the situation.
With the deterioration of processed crude oil and the increase of oil types, it usually causes the drift and change of equipment corrosion parts when processing mixed crude oil. To this end, the power department of Takahashi Petrochemical Equipment uses a variety of corrosion monitoring methods such as fixed-point thickness measurement, probe online monitoring, and chemical analysis monitoring to determine the trend of corrosion based on changes in monitoring data. When there is a change trend that exceeds the expectation, on the one hand, find the cause of the process change, on the other hand, increase the local fixed-point thickness measurement appropriately, and find the weak links that may exist by the equipment inspection station, and then take the necessary control measures.
There are currently 2 sets of distillation, 2 sets of coke extension, 3 sets of catalysis, diesel hydrogenation, hydrocracking and solvent regeneration devices using the probe online monitoring system. The probes used include three types: high and low temperature resistance, high and low temperature inductance, and electrochemistry. The collection cycle is once every 30 minutes to 2 hours for different types of probes. The trend of the metal loss of the probe head inserted at the monitoring point reflects the corrosion changes at that location.
The fixed-point thickness measurement basically covers the high and low-temperature pipelines and equipment of the company's key equipment in the refining area. At present, the fixed-point thickness measurement is basically measured once every quarter, and the light oil tank area is measured twice a year. The test data directly reflects the equipment pipe wall thickness and the amount of thinning over a period of time. At present, the fixed-point thickness measurement data and data have been completed by the equipment power department, each operation department and the EM system where the equipment inspection is located.
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