Optimization method of water injection for hydrogenation reaction outflow air-cooler system

Abstract

The invention discloses an optimization method of water injection for a hydrogenation reaction outflow air-cooler system, which includes water injection point optimization, water injection mode optimization and water injection rate optimization. Operating parameters of the hydrogenation reaction outflow air-cooler system can be read by a DCS control system database, by combining with the chemicallaboratory analysis data of the hydrogenation reaction outflow air-cooler system, aiming at the deposition temperatures of NH4Cl and NH4HS during the operation process under variable working conditions of the hydrogenation reaction outflow air-cooler system, and combining with temperatures of the entrance and the exit of an air-cooler and the relative humidity of a hydrogenation reaction outflow before and after water injection, optimization can be performed on the water injection point, water injection mode and water injection rate, thereby avoiding under-deposit corrosion and local erosion of the REAC system pipeline and the tube bundle caused by the deposition of the NH4Cl and NH4HS, the operation personnel can carry out water injection optimization on the REAC system, thereby effectively avoiding the unscheduled shutdown accident caused by the REAC system failure, and ensuring the safe, stable and long period operation of the REAC system.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to an optimization method for water injection of hydrogenation reaction effluent air cooler system. Background technique [0002] Hydrocracking is the core technology for lightening heavy oil and an important secondary processing method in petrochemical enterprises. In recent years, changes in demand for high-quality, high-diesel-to-gasoline product structures have further promoted the rapid development of hydrogenation technology. Ammonium salts (NH 4 Cl and NH 4 The flow deposition corrosion of HS) has always been a difficult problem for petrochemical enterprises. In order to prevent the crystallization and deposition of ammonium salts in heat exchange tube bundles and equipment, flushing water is usually injected upstream of the hydrogenation reaction effluent air cooler (referred to as REAC) system to wash away the deposited ammonium salts. However, a high concentration...

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Problems solved by technology

However, the research results mainly come from the statistical analysis of corrosion phenomena and the operating experience of the staff, especially the research on the corrosion mechanism of REAC failure caused by the processing of chlorinated raw oil is not clear enough, and the lack of NH 4 Quantitative analysis of Cl crystal deposition

Moreover, there is a lack of effective control methods for the harsh working conditions of processing inferior acid-containing raw oil

Therefore, accidents of corrosion leakage of REAC system due to ammonium salt deposition still occur from time to time

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