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Optimization method of hydrogenation reaction effluent air cooler system for preventing erosion of NH4HS

A technology for hydrogenation reaction and system optimization, applied in the direction of electrical program control, comprehensive factory control, etc., can solve the problems of many unplanned shutdown accidents and lack of correlation analysis in the REAC system, so as to reduce unplanned shutdown accidents and improve economic efficiency. effect of benefit

Inactive Publication Date: 2011-05-18
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology

Since the above-mentioned control indicators are mainly derived from the statistical analysis of corrosion phenomena, and there is a lack of analysis of the correlation of various influencing factors, there are still many unplanned downtime accidents caused by corrosion leakage of the REAC system

Method used

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  • Optimization method of hydrogenation reaction effluent air cooler system for preventing erosion of NH4HS
  • Optimization method of hydrogenation reaction effluent air cooler system for preventing erosion of NH4HS
  • Optimization method of hydrogenation reaction effluent air cooler system for preventing erosion of NH4HS

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specific Embodiment

[0050] It is known that the DCS control system database of a hydrocracking unit in a petrochemical enterprise includes: the raw material feed volume W of the hydrogenation reaction effluent system f 120t / h, water injection volume WW r 10t / h, the molar flow rate of circulating hydrogen mX 1 7151.4kmol / h, molar flow mX of low dry gas 2 66.96kmol / h, air cooler operating pressure P system 11.2Mpa, the outlet temperature of each air cooler (T i , i=1~8) T 1 38.02°C, T 2 34.37°C, T 3 39.92°C, T 4 36.54°C, T 5 35.44°C, T 6 35.52°C, T 7 41.51,T 8 43.13°C, the number of air coolers is i8;

[0051] Raw oil raw test analysis data include: average S content of raw oil F s 1.60%, the average N content of raw oil F n 800ppm, H in circulating hydrogen 2 S content F' s 3000ppm, the average molecular weight of circulating hydrogen mwX 1 5.54, the average molecular weight mwX of low dry gas 2 3.54, the density of the mixture at the inlet of the air cooler ρ58k...

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Abstract

The invention discloses an optimization method of a hydrogenation reaction effluent air cooler system for preventing erosion of NH4HS, which comprises the optimization of the water injection rate, the optimization of the partial pressure of H2S, the optimization of the mean flow velocity of an air cooler, and the optimization of the outlet temperature of the air cooler. The optimization method comprises the following steps: reading the operating parameters of the hydrogenation reaction effluent air cooler system through a distributed control system (DCS) database; and by combining the laboratory analysis data of the hydrogenation reaction effluent air cooler system and aiming at the erosion property of the NH4HS water solution in the operating processes of the hydrogenation reaction effluent air cooler system in different operating conditions, optimizing the water injection rate of the REAC system, the partial pressure of H2S, the mean flow velocity of the air cooler and the outlet temperature of the air cooler. The optimization method of the invention can effectively prevent the erosion of NH4HS in the REAC system, thereby avoiding the unplanned shutdown accident caused by corrosion failure of the REAC system and ensuring that the REAC system can safely and stably operate for a long period.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to the prevention of NH 4 Optimization method of air cooler system for hydrogenation reaction effluent with HS erosion. Background technique [0002] Hydrocracking is the core technology for lightening heavy oil and an important secondary processing method in refineries. In recent years, the product structure requirements of clean refined oil and high diesel-to-gasoline ratio have further promoted the rapid development of hydrocracking technology. The salient feature of the hydrocracking unit is that it operates under the conditions of high temperature, high pressure, and hydrogen, and the corrosive medium transported is flammable and explosive, which has a high safety risk. Since the use of hydrogenation technology, the corrosion failure of the hydrogenation reaction effluent air cooler (REAC) system and its connected pipelines has been a difficult problem for petrochemical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/418
Inventor 偶国富郑智剑曹晶洪惠芬
Owner ZHEJIANG SCI-TECH UNIV
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