CN-121998464-A - Corrosion risk evaluation method for hydrogenation device circulating hydrogen desulfurization system

CN121998464ACN 121998464 ACN121998464 ACN 121998464ACN-121998464-A

Abstract

The invention provides a corrosion risk evaluation method of a hydrogenation device circulating hydrogen desulfurization system, which relates to the field of corrosion evaluation of petroleum refining equipment and comprises the steps of S1 selecting a plurality of key technological parameters as evaluation indexes and establishing a quantitative scoring system, S2 determining weights of all evaluation indexes based on a corrosion mechanism of the hydrogenation device circulating hydrogen desulfurization system, S3 collecting technological parameter data in a preset period, S4 calculating scores of all evaluation indexes according to the quantitative scoring system, S5 combining weights and material factors of all evaluation indexes to calculate a total evaluation index score, and S6 carrying out corrosion risk evaluation and early warning according to the total evaluation index score. The invention is beneficial to improving the operation safety and reliability of the hydrogenation device, and can provide important basis for the optimized operation and preventive maintenance of the device, thereby obviously reducing the failure rate of equipment, prolonging the service life of the device and finally realizing the double promotion of economic benefit and safety.

Inventors

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

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 risk evaluation method for the circulating hydrogen desulfurization system of the hydrogenation device is characterized by comprising the following steps of: S1, selecting a plurality of key process parameters as evaluation indexes, and establishing a quantization scoring system; s2, determining the weight of each evaluation index based on a corrosion mechanism of a hydrogenation device circulating hydrogen desulfurization system; S3, collecting process parameter data in a preset period; s4, calculating the score of each evaluation index according to the quantitative scoring system; S5, calculating a total evaluation index score by combining the weight and the material factor of each evaluation index; and S6, performing corrosion risk assessment and early warning according to the total evaluation index score.
2. The method for evaluating corrosion risk of a hydrodesulfurization system according to claim 1, wherein the evaluation index comprises sulfur content of raw oil, absorption of acid gas in amine liquid, heat stable salt content in amine liquid, pH value of amine liquid and operating temperature of desulfurizing tower.
3. The method for evaluating corrosion risk of a hydro-device circulating hydrogen desulfurization system according to claim 2, wherein a quantitative scoring system adopts a percentile system, corresponding scoring standards are respectively formulated for the evaluation parameters of each evaluation index, wherein the scoring standards divide the value range of the evaluation parameters into 6 scoring intervals, each scoring interval corresponds to one scoring range or score, and the score S j of each evaluation index is calculated according to each scoring range or score and a calculation formula.
4. A method for evaluating corrosion risk of a hydrodesulfurization system according to claim 3, wherein the evaluation parameter of the sulfur content evaluation index of the raw oil is a ratio of an actual sulfur content value C' s to a fortification sulfur content value C s , and the evaluation parameter is used for making a scoring standard as follows: When C ' s /C s ＜a 1 is C', it is the 1 st scoring interval, the interval scoring range is [ b 1 ,b 2 ], and the sulfur content of the raw oil in the scoring range is scored as follows k 1 ＝(b 2 -b 1 )/a 1 ; When a 1 ≤C′ s /C s ＜a 2 is a 2 nd scoring interval, the interval scoring range is [ b 2 ,b 3 ], and the sulfur content of the raw oil in the scoring range is scored k 2 ＝(b 3 -b 2 )/(a 2 -a 1 ); When a 2 ≤C′ s /C s ＜a 3 is a3 rd scoring interval, the interval scoring range is [ b 3 ,b 4 ], and the sulfur content of the raw oil in the scoring range is scored as K 3 ＝(b 4 -b 3 )/(a 3 -a 2 ); When a 3 ≤C′ s /C s ＜a 4 is a 4 th scoring interval, the interval scoring range is [ b 4 ,b 5 ], and the sulfur content of the raw oil in the scoring range is scored as K 4 ＝(b 5 -b 4 )/(a 4 -a 3 ); When a 4 ≤C′ s /C s ＜a 5 is the 5 th scoring interval, the interval scoring range is [ b 5 ,b 6 ], and the sulfur content of the raw oil in the scoring range is scored K 5 ＝(b 6 -b 5 )/(a 5 -a 4 ); when C ' s /C s ≥a 5 is C', it is the 6 th scoring interval, and the sulfur content of the raw oil in the interval is scored as Wherein ,a 1 <a 2 <a 3 <a 4 <a 5 ,b 1 >b 2 >b 3 >b 4 ＞b 5 ＞b 6 ,k 1 、k 2 、k 3 、k 4 、k 5 is the slope parameter of the sulfur content score of the raw oil.
5. A method for evaluating corrosion risk of a hydrokinetic desulfurization system according to claim 3, wherein the evaluation parameter of the amine liquid acid gas absorption amount evaluation index is an actual acid gas absorption amount value η, and the evaluation parameter is used for making the following evaluation criteria: when eta < c 1 , it is the 1 st scoring interval, the scoring range of the interval is [ d 1 ,d 2 ], and the amine liquid acid gas absorption amount in the scoring range is scored as follows m 1 ＝(d 2 -d 1 )/c 1 ; When c 1 ≤η＜c 2 , it is the 2 nd scoring interval, the interval scoring range is [ d 2 ,d 3 ], and the amine liquid acid gas absorption score in the scoring range is m 2 ＝(d 3 -d 2 )/(c 2 -c 1 ); When c 2 ≤η＜c 3 is the 3 rd scoring interval, the interval scores d 3 ,d 4 , and the amine liquid acid gas absorption score in the scoring range is m 3 ＝(d 4 -d 3 )/(c 3 -c 2 ); When c 3 ≤η＜c 4 is the 4 th scoring interval, the interval scores d 4 ,d 5 , and the amine liquid acid gas absorption score in the scoring range is m 4 ＝(d 5 -d 4 )/(c 4 -c 3 ); When c 4 ≤η＜c 5 is the 5 th scoring interval, the interval scores d 5 ,d 6 , and the amine liquid acid gas absorption score in the scoring range is m 5 ＝(d 6 -d 5 )/(c 5 -c 4 ); When eta is larger than or equal to c 5 , the method is a 6 th grading interval, and the absorption amount of amine liquid acid gas in the interval is scored as Wherein ,c 1 <c 2 <c 3 <c 4 ＜c 5 ,d 1 ＞d 2 >d 3 ＞d 4 ＞d 5 >d 6 ,m 1 、m 2 、m 3 、m 4 、m 5 is the slope parameter of the amine liquid acid gas absorption score; Wherein, the scoring interval of the amine liquid acid gas absorption amount evaluation index is determined according to the types of the absorbents, namely, the corresponding values of c 1 ,c 2 ,c 3 ,c 4 ,c 5 are different for different types of the absorbents.
6. A method for evaluating corrosion risk of a hydrokinetic desulfurization system according to claim 3, wherein the evaluation parameter of the evaluation index of the content of the heat stable salt in the amine liquid is the actual value C h of the content of the heat stable salt, and the evaluation parameter is used for making the evaluation standard as follows: When C h <e 1 is C h <e 1 , it is the 1 st scoring interval, the scoring range of the interval is [ f1, f 2 ], and the heat stable salt content in the amine liquid in the scoring range is z 1 ＝(f 2 -f 1 )/e 1 ; When e 1 ≤C h <e 2 is the 2 nd scoring interval, the interval scores the range of [ f 2 ,f 3 ], and the heat stable salt content in the amine liquid in the scoring range scores z 2 ＝(f 3 -f 2 )/(e 2 -e 1 ); When e 2 ≤C h ＜e 3 is the 3 rd scoring interval, the interval scores the range of [ f 3 ,f 4 ], and the heat stable salt content in the amine liquid in the scoring range scores z 3 ＝(f 4 -f 3 )/(e 3 -e 2 ); When e 3 ≤C h ＜e 4 is the 4 th scoring interval, the interval scores in the range of [ f 4 ,f 5 ], the heat stable salt content in the amine liquid is scored in the scoring range z 4 ＝(f 5 -f 4 )/(e 4 -e 3 ); When e 4 ≤C h <e 5 is the 5 th scoring interval, the interval scores [ f 5 ,f 6 ], the heat stable salt content in the amine liquid scores in the scoring range z 5 ＝(f 6 -f 5 )/(e 5 -e 4 ); When C h ≥e 5 is C h ≥e 5 , it is the 6 th scoring interval, the heat stable salt content in the amine liquid in this interval is scored as Wherein ,e 1 <e 2 <e 3 <e 4 ＜e 5 ,f 1 >f 2 >f 3 >f 4 >f 5 >f 6 ,z 1 、z 2 、z 3 、z 4 、z 5 is the slope parameter of the heat stable salt content score in the amine liquid.
7. A method for evaluating corrosion risk of a hydrokinetic desulfurization system according to claim 3, wherein the evaluation parameter of the evaluation index of the pH value of the amine liquid is the actual pH value of the amine liquid, and the evaluation criterion is formulated according to the evaluation parameter as follows: When the pH is more than or equal to g 1 , the pH is 1 st scoring interval, and the interval scores are as follows When g 2 ≤pH＜g 1 , it is the 2 nd scoring interval, which is in the scoring range (h 1 ,h 2 ), the amine liquid pH score in this scoring range is v 1 ＝(h 1 -h 2 )/(g 1 -g 2 ); When g 3 ≤pH＜g 2 , it is the 3 rd scoring interval, which is within the scoring range (h 2 ,h 3 ), the amine liquid pH score is within the scoring range v 2 ＝(h 2 -h 3 )/(g 2 -g 3 ); When g 4 ≤pH＜g 3 , it is the 4 th scoring interval, which is within the scoring range (h 3 ,h 4 ), the amine liquid pH score is within the scoring range v 3 ＝(h 3 -h 4 )/(g 3 -g 4 ); When g 5 ≤pH＜g 4 , it is the 5 th scoring interval, which is in the scoring range (h 4 ,h 5 ), the amine liquid pH score in this scoring range is v 4 ＝(h 4 -h 5 )/(g 4 -g 5 ); When the pH is less than g 5 , the pH is the 6 th scoring interval, the scoring range of the interval is (h 5 ,h 6 ), and the pH score of the amine liquid in the scoring range is v 5 ＝(h 5 -h 6 )/g 5 ; Wherein ,g 1 ＞g 2 >g 3 >g 4 ＞g 5 ,h 1 ＞h 2 >h 3 >h 4 >h 5 >h 6 ,v 1 、v 2 、v 3 、v 4 、v 5 is the slope parameter of the amine liquid pH score.
8. A method for evaluating corrosion risk of a hydrokinetic desulfurization system according to claim 3, wherein the evaluation parameter of the evaluation index of the operating temperature of the desulfurization tower is the actual value T of the operating temperature of the desulfurization tower, and the evaluation parameter is used for making the scoring standard as follows: when T < r 1 , it is the 1 st scoring interval, the scoring range of the interval is [ w 1 ,w 2 ], and the operating temperature of the desulfurizing tower in the scoring range is u 1 ＝(w 2 -w 1 )/r 1 ; When r 1 ≤T<r 2 , it is the 2 nd scoring interval, the interval scoring range is [ w 2 ,w 3 ], the operating temperature of the desulfurizing tower within the scoring range is scored u 2 ＝(w 3 -w 2 )/(r 2 -r 1 ); When r 2 ≤T<r 3 is the 3 rd scoring interval, the interval scoring range is [ w 3 ,w 4 ], and the operating temperature of the desulfurizing tower in the scoring range is scored u 3 ＝(w 4 -w 3 )/(r 3 -r 2 ); When r 3 ≤T<r 4 is the 4 th scoring interval, the interval scoring range is [ w 4 ,w 5 ], and the operating temperature of the desulfurizing tower in the scoring range is scored u 4 ＝(w 5 -w 4 )/(r 4 -r 3 ); When r 4 ≤T<r 5 is the 5 th scoring interval, the interval scoring range is [ w 5 ,w 6 ], the operating temperature of the desulfurizing tower within the scoring range is scored u 5 ＝(w 6 -w 5 )/(r 5 -r 4 ); When T is more than or equal to r 5 , the temperature is the 6 th grading interval, and the operating temperature score of the desulfurizing tower in the interval is Wherein ,r 1 <r 2 <r 3 <r 4 <r 5 ,w 1 ＞w 2 ＞w 3 ＞w 4 >w 5 ＞w 6 ,u 1 、u 2 、u 3 、u 4 、u 5 is the slope parameter of the desulfurizing tower operation temperature score.
9. A method for evaluating corrosion risk of a hydrokinetic desulfurization system according to claim 3, wherein the total evaluation index score is calculated as follows: S T ＝f m ×∑W j S j wherein S T is the total evaluation index score, f m is the material factor, W j is the j-th single evaluation index weight, and S j is the j-th single evaluation index score.
10. A method of evaluating corrosion risk of a hydronic system as claimed in claim 9, wherein the material factor is related to the material of the hydronic system equipment or piping, and is defined by f m =0.9 for carbon steel, f m =1.0 for low alloy steel, and f m =1.2 for stainless steel.

Description

Corrosion risk evaluation method for hydrogenation device circulating hydrogen desulfurization system Technical Field The invention relates to the field of corrosion evaluation of petroleum refining equipment, in particular to a corrosion risk evaluation method of a hydrogenation device circulating hydrogen desulfurization system. Background In the modern petroleum refining industry, a hydrogenation process is taken as a core technology, and plays a vital role in improving the processing depth of crude oil, improving the product quality and improving the production efficiency. In the hydrogenation reaction process, sulfur-containing compounds in the raw oil react with hydrogen to generate corresponding hydrocarbon compounds and hydrogen sulfide (H2S). However, the H2S gas generated in the process is continuously enriched in the circulating hydrogen system, so that the hydrogen partial pressure in the circulating hydrogen can be reduced, the hydrogenation reaction is not facilitated, the corrosion rate of equipment and pipelines can be remarkably increased, and the safety and reliability of the whole system are seriously threatened. In order to maintain high purity of the recycle hydrogen and to prevent excessive accumulation of H2S, the hydrotreater is typically equipped with a recycle hydrogen desulfurization system. The system generally adopts an alkaline alcohol amine solution as an absorbent, and realizes the efficient removal of H2S in the circulating hydrogen through a countercurrent absorption process. However, the circulating hydrodesulfurization system itself also faces multiple challenges from H2S, amine solutions, and other corrosive media, with potential corrosion risks. During actual operation of the hydrogenation unit, fluctuations in various process parameters such as feedstock oil properties, amine liquid properties, operating temperatures, etc., can have a significant impact on the corrosion behavior of the circulating hydrodesulfurization system. Therefore, the method monitors various technological parameters in the production process in real time and performs systematic statistical analysis, and has important significance for timely finding corrosion risk and accurately diagnosing corrosion cause. However, the main challenges currently faced are firstly the wide variety of process parameters and huge data volume, secondly the lack of clear quantitative correlation between each process parameter and corrosion risk, and furthermore, the existing evaluation methods are often too simple or subjective, and it is difficult to quickly and accurately diagnose the potential corrosion risk from massive statistical data of process parameters. These factors together lead to complexity and uncertainty in corrosion risk assessment. In addition, traditional corrosion monitoring methods, such as corrosion coupons, electrochemical probes, and the like, while capable of providing valuable data, tend to suffer from hysteresis, and real-time early warning of corrosion risk is difficult to achieve. Meanwhile, these methods generally reflect the corrosion conditions of local areas, and it is difficult to comprehensively evaluate the corrosion risk of the whole system. Therefore, there is a need to develop a new and systematic corrosion risk assessment method. Disclosure of Invention In view of the above, the invention provides a corrosion risk evaluation method for a hydro-device circulating hydrogen desulfurization system, which comprehensively considers the influence of various technological parameters, establishes a quantitative relationship between the technological parameters and corrosion risk, and can perform rapid and accurate risk diagnosis and early warning based on real-time operation data. The hydrogenation device not only contributes to improving the operation safety and reliability of the hydrogenation device, but also provides important basis for optimizing operation and preventive maintenance of the device, thereby obviously reducing the equipment failure rate, prolonging the service life of the device and finally realizing the dual promotion of economic benefit and safety. The technical scheme of the invention is realized as follows: the invention provides a corrosion risk evaluation method of a hydrogenation device circulating hydrogen desulfurization system, which comprises the following steps: S1, selecting a plurality of key process parameters as evaluation indexes, and establishing a quantization scoring system; s2, determining the weight of each evaluation index based on a corrosion mechanism of a hydrogenation device circulating hydrogen desulfurization system; S3, collecting process parameter data in a preset period; s4, calculating the score of each evaluation index according to the quantitative scoring system; S5, calculating a total evaluation index score by combining the weight and the material factor of each evaluation index; and S6, performing corrosion risk assessment and early