CN-121988134-A - Corrosion control system of hydrogenation device circulating hydrogen desulfurization system

CN121988134ACN 121988134 ACN121988134 ACN 121988134ACN-121988134-A

Abstract

The invention relates to the technical field of corrosion control of petroleum refining equipment, in particular to a corrosion control system of a hydro-device circulating hydrogen desulfurization system, which comprises a circulating hydrogen desulfurization system, a data acquisition module, a data processing module, a feedback regulation module and a feedback regulation module, wherein the circulating hydrogen desulfurization system is connected with an amine liquid feeding system and is used for injecting lean amine liquid to absorb and remove H 2 S in circulating hydrogen gas, the data acquisition module is used for acquiring process parameters of the circulating hydrogen desulfurization system and sending the process parameters to the data processing module, the data processing module is used for calculating theoretical amine liquid injection amount according to the process parameters and corrosion control indexes and sending the theoretical amine liquid injection amount to the feedback regulation module, and the feedback regulation module is used for controlling the amine liquid feeding system to regulate the lean amine liquid injection amount of the circulating hydrogen desulfurization system in real time according to the theoretical amine liquid injection amount. According to the invention, the theoretical amine liquid injection quantity is automatically calculated according to the technological parameters and the corrosion control indexes, and the actual injection quantity is continuously adjusted through closed-loop control, so that the desulfurization efficiency is improved, and the corrosion risk of the system is effectively controlled.

Inventors

XIA YONGSHENG
MIAO PU
ZHANG HONGFEI
YU FENGCHANG
ZHU WANYING
YU HUIWEN

Assignees

中国石油化工股份有限公司
中石化炼化工程（集团）股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (10)

1. The corrosion control system of the hydrogenation device circulating hydrogen desulfurization system is characterized by comprising a data acquisition module, a data processing module, a circulating hydrogen desulfurization system, an amine liquid feeding system and a feedback regulation module; The circulating hydrogen desulfurization system is connected with an amine liquid feeding system, the amine liquid feeding system is used for injecting lean amine liquid into the circulating hydrogen desulfurization system, and the circulating hydrogen desulfurization system is used for absorbing and removing H 2 S in the circulating hydrogen gas; The data acquisition module is used for acquiring the technological parameters of the circulating hydrogen desulfurization system when in operation and sending the technological parameters to the data processing module; the data processing module is used for calculating the theoretical amine liquid injection amount according to the technological parameters and the corrosion control indexes and sending the theoretical amine liquid injection amount to the feedback regulation module; The feedback regulation module is used for controlling the amine liquid feeding system to regulate the lean amine liquid injection amount of the circulating hydrogen desulfurization system in real time according to the theoretical amine liquid injection amount.
2. A hydrogenation device circulation hydrogen desulfurization system corrosion control system is characterized in that the process parameters comprise process operation data and chemical analysis data, the process operation data comprise circulation volume of circulation hydrogen and lean amine liquid flow, the chemical analysis data comprise H 2 S content in circulation hydrogen before removal, H 2 S content in circulation hydrogen after removal and amine liquid mass percentage concentration, and the corrosion control index is amine liquid acid gas absorption volume.
3. The system of claim 1, wherein the data acquisition module and the circulating hydrogen desulfurization system exchange data via MODBUS communication protocol.
4. A hydrogenation device circulation hydrogen desulfurization system corrosion control system according to claim 2, wherein the corrosion control system comprises the following steps: s1, acquiring process parameters of a circulating hydrogen desulfurization system in real time through a data acquisition module; S2, analyzing and calculating the acquired process parameters by utilizing a data processing module based on a preset corrosion control index to obtain a theoretical amine liquid injection amount; s3, through a feedback adjusting module, according to the calculated theoretical amine liquid injection amount, the operation parameters of the amine liquid feeding system are adjusted in real time, so that the actual amine liquid injection amount is the same as the theoretical amine liquid injection amount.
5. The method of claim 4, wherein the step S2 comprises obtaining the content of H 2 S currently absorbed according to the difference between the content of H 2 S in the circulating hydrogen before and after absorption and the circulating hydrogen circulation amount, and obtaining the theoretical amine liquid injection amount based on the preset amine liquid acid gas absorption amount and the content of H 2 S currently absorbed.
6. The corrosion control system for a hydrodesulfurization system according to claim 5, wherein in step S2, the theoretical amine solution injection amount is calculated according to the following formula: the injection amount of the theoretical amine liquid is t/h; Q H is circulation quantity of circulating hydrogen, m 3 /h; Mg/m 3 for H 2 S content in the pre-stripping recycle hydrogen; Mg/m 3 for H 2 S content in post-dehydrogenized recycle hydrogen; M A is the relative molecular mass, g/mol, of the amine in the amine liquid; eta is the absorption capacity of amine liquid acid gas and mol/mol; w A is the mass percent concentration of the amine liquid,%; M H2S is the relative molecular mass, g/mol, of H 2 S.
7. A hydrodesulphurisation system corrosion control system according to claim 4, wherein said amine solution comprises any of ethanolamine, diethanolamine and N-methyldiethanolamine.
8. The corrosion control system for a hydrodesulfurization system of a hydrogenation unit according to claim 5, wherein the predetermined absorption capacity of the amine liquid is no more than 0.3mol/mol when the amine liquid is ethanolamine or diethanolamine, and the predetermined absorption capacity of the amine liquid is no more than 0.4mol/mol when the amine liquid is N-methyldiethanolamine.
9. The corrosion control system for a hydrokinetic desulfurization system according to claim 4, wherein the step S3 comprises: S31, acquiring the current actual amine liquid injection amount, and calculating the difference value between the actual amine liquid injection amount and the theoretical amine liquid injection amount; S32, calculating an adjustment quantity by utilizing a PID control algorithm according to the difference value, converting the calculated adjustment quantity into a control signal, sending the control signal to an amine liquid feeding system, and adjusting the injection quantity of the amine liquid; S33, continuously monitoring the actual amine liquid injection amount, and repeating the steps S31-S32 until Wherein, the The injection amount of the theoretical amine liquid is t/h; The injection amount of the actual amine liquid is t/h, and epsilon is a preset allowable error range.
10. A hydrodesulphurisation system corrosion control system according to claim 9, wherein in step S32, adjusting the amount of amine liquid injected comprises adjusting the rotational speed of an amine liquid feed system comprising an amine liquid feed pump by means of a frequency converter or a speed regulating motor, or adjusting the opening of an outlet valve of the amine liquid feed system.

Description

Corrosion control system of hydrogenation device circulating hydrogen desulfurization system Technical Field The invention relates to the technical field of corrosion control of petroleum refining equipment, in particular to a corrosion control system of a circulating hydrogen desulfurization system of a hydrogenation device. Background Hydrogenation has important significance for improving the processing degree of crude oil, improving the product quality, improving the light oil yield and reducing the atmospheric pollution, and the importance of the hydrogenation process is more remarkable along with the deterioration of the weight of crude oil and the increase of the market demand for high-quality middle distillate oil. The hydrogenation device generally comprises a reaction system, a generated oil heat exchange, cooling and separation system, a circulating hydrogen system, a generated oil water injection system and the like. The circulating hydrogen system is used as one of important systems in the hydrogenation device, realizes continuous hydrogenation reaction through cyclic utilization of hydrogen, and improves the conversion rate of raw materials and the quality of products. However, the gas such as H 2 S generated in the hydrogenation reaction is taken as a corrosive medium, so that a large corrosion risk is brought to equipment and pipelines of a hydrogenation device, and the hydrogen partial pressure in circulating hydrogen is reduced, so that the hydrogenation reaction is not facilitated. Therefore, in order to ensure the purity of the recycle hydrogen, to avoid accumulation of H 2 S in the recycle hydrogen system, a recycle hydrogen desulfurization system is generally provided to recover H 2 S. At present, a circulating hydrogen desulfurization device in a refinery generally adopts alkaline alcohol amine solution to absorb and remove H 2 S in circulating hydrogen gas in a countercurrent way in an absorption tower. The circulating hydrogen desulfurization system is provided with corrosive media such as H 2 S, amine liquid and the like, and typical wet H 2 S corrosion environment and amine corrosion environment exist, wherein the absorption amount of amine liquid acid gas is one of important indexes for measuring the corrosion risk of the circulating hydrogen desulfurization system. When the H 2 S content in the circulating hydrogen is increased or the flow rate of the lean amine liquid is reduced in the circulating hydrogen desulfurization process, the absorption amount of acid gas in the amine liquid is increased, and the H 2 S content in the circulating hydrogen after absorption is increased. An increase in H 2 S content increases the risk of wet H 2 S corrosion of the equipment in the system, while an increase in the amount of acid gas absorbed in the amine solution accelerates amine degradation and the formation of thermally stable amine salts, thereby increasing the risk of amine corrosion of the equipment in the system. The fluctuation of the device treatment capacity and the raw oil property in the production process of the hydrogenation device can influence the H 2 S content in the circulating hydrogen, when the device treatment capacity or the raw oil sulfur content is increased, the H 2 S content in the circulating hydrogen is increased, and if the amine liquid feeding amount is kept unchanged, the treatment load of a circulating hydrogen desulfurization system is increased, so that the corrosion risk is increased. However, the related process parameters of the circulating hydrogen system of the hydrogenation device of the refinery at present lack of correlation, and the corresponding feedback adjustment is difficult to be made in time according to the process parameter fluctuation in the production process, so that the device has corrosion hidden danger, and certain challenges are brought to the safe and stable operation of the device. Therefore, development of an effective corrosion control and intelligent feedback control method is needed to ensure long-period stable operation of the device. Disclosure of Invention In view of the above, the invention provides a corrosion control system for a hydro-device circulating hydrogen desulfurization system, so as to solve the problem that the conventional hydro-device circulating hydrogen desulfurization system is difficult to timely feed back and adjust when technological parameters in the production process fluctuate, thereby causing corrosion risk. The technical scheme of the invention is realized in that the invention provides a corrosion control system of a hydro-device circulating hydrogen desulfurization system, which comprises a data acquisition module, a data processing module, a circulating hydrogen desulfurization system, an amine liquid feeding system and a feedback regulation module; The circulating hydrogen desulfurization system is connected with an amine liquid feeding system, the amine liquid feeding system is used for inject