CN110118719A - Method and device for evaluating material corrosion by using uniform corrosion rate - Google Patents
Method and device for evaluating material corrosion by using uniform corrosion rate Download PDFInfo
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Abstract
The invention provides a method and a device for evaluating material corrosion by using uniform corrosion rate. Wherein the method comprises the following steps: determining a corrosion protection standard; obtaining corrosion data of the monitoring equipment, wherein the corrosion data comprise a uniform corrosion rate, and the uniform corrosion rate is an average corrosion rate of the monitoring equipment in one or more recent monitoring periods; comparing the corrosion data with a corrosion protection standard to obtain a comparison result, wherein the comparison result comprises the corrosion state of the monitoring equipment and the corrosion condition of the material used by the monitoring equipment; and executing corresponding anticorrosion measures according to the comparison result. The method provided by the invention determines the corrosion condition of the monitoring equipment and makes a targeted anticorrosion measure based on the obtained corrosion data so as to improve the corrosion prevention and control level of the refining and chemical device.
Description
Technical Field
The invention belongs to the technology of corrosion and protection of equipment of refining and chemical enterprises, particularly relates to a method and a device for evaluating material corrosion by using uniform corrosion rate, particularly relates to a method and a device for carrying out corrosion protection on processing equipment of a refining and chemical enterprise by using corrosion rate, and belongs to the technical field of intelligent corrosion evaluation.
Background
The oil refining chemical industry is an industry with a very prominent danger, and any leakage caused by corrosion can cause serious safety production accidents in the petroleum processing process, such as severe accidents of ignition and even explosion of production devices, casualties, property loss, environmental pollution and the like. Moreover, since corrosive media in crude oil inevitably exist, equipment corrosion of the refining device is inevitable, and therefore, the corrosion of the equipment is effectively controlled, and the corrosion is a core factor for ensuring the safe and long-period operation of the oil refining device.
At present, petroleum refining enterprises generally monitor key parameters of a part which is easy to corrode in a refining device, such as uniform corrosion rate of equipment and pipelines which are easy to corrode, then reliably evaluate the key parameters, provide timely and effective countermeasures, and finally control the corrosion of the refining device within a range required by safety production.
Although, most studies are focused on how to accurately obtain the key parameter of the corrosion rate, including the measurement technology, measurement equipment, etc. of the corrosion rate. However, how to effectively utilize the corrosion rate to evaluate the corrosion condition of the equipment and the pipelines used in a specific corrosion environment, so as to provide suggestions and measures for corrosion prevention and control for the operation or replacement of the equipment and the pipelines, and how to provide the corrosion prevention and control for the corrosion rate still remains a key problem to be faced at present.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method and a device for evaluating the corrosion of materials by using a uniform corrosion rate, which are used for determining the corrosion state of monitoring equipment and the corrosion condition of the materials used by the monitoring equipment based on the obtained corrosion data and the corrosion protection standard and making targeted anticorrosion measures so as to improve the corrosion prevention and control level of a refining and chemical device.
In a first aspect of the present invention, there is provided a method for evaluating corrosion of a material with a uniform corrosion rate, comprising:
determining a corrosion protection standard;
obtaining corrosion data of the monitoring equipment, wherein the corrosion data comprise a uniform corrosion rate, and the uniform corrosion rate is an average corrosion rate of the monitoring equipment in one or more recent monitoring periods;
comparing the corrosion data with a corrosion protection standard to obtain a comparison result, wherein the comparison result comprises the corrosion state of the monitoring equipment and the corrosion condition of the material used by the monitoring equipment;
and executing corresponding anticorrosion measures according to the comparison result.
Specifically, the monitoring device may be an oil refining device commonly used in an oil refining process of an oil refining enterprise, and particularly, an oil refining device which is easily corroded by crude oil, including equipment and pipelines. For example, a stripping tower of a common three-line corrosion system of an oil refining production enterprise or normal-pressure tower top condensing equipment and the like are used as monitoring equipment. A schematic diagram of a typical conventional three-wire corrosion system is shown in fig. 1.
The material of the monitoring device is generally steel, including carbon steel, chrome molybdenum steel, stainless steel, dual phase steel, etc., and the invention is not limited thereto.
The corrosion data includes at least a uniform corrosion rate of the monitoring device, i.e., an average corrosion rate of the monitoring device over a last monitoring period or periods. The specific method for measuring and calculating the average corrosion rate of the monitoring equipment is not particularly limited, and the method can be implemented and completed by adopting the conventional technical means in the field. In the implementation process of the invention, the key parameter of obtaining the average corrosion rate can be measured by the following three ways:
1) an online corrosion rate probe instrument is installed in the corrosion-prone equipment or pipeline, and the uniform corrosion rate of the equipment or pipeline made of a specific material in a specific corrosion environment is obtained by analyzing data detected by the probe instrument.
2) A corrosion monitoring test piece is arranged in an online bypass test kettle of the refining device, and the uniform corrosion rate of equipment or pipelines made of certain materials in a specific corrosion environment is obtained according to a uniform corrosion full-immersion test method (JB/T7901-.
3) The method comprises the steps of testing corrosion-prone equipment and pipelines in a refining device by adopting manual regular thickness measurement and an online thickness measurement technology to obtain residual wall thickness data of the pipelines, and then obtaining the uniform corrosion rate of a specific material in a specific corrosion environment according to a corrosion rate calculation formula.
The on-line corrosion rate probe, the corrosion test piece in the on-line bypass test kettle and the fixed-point thickness measurement monitoring technology for the equipment pipeline can detect the corrosion conditions of equipment, pipelines and other monitoring equipment used in a specific corrosion environment, thereby providing technical support and reference basis for the operation or replacement of the monitoring equipment, the corrosion prevention and control of a refining device and the like.
In order to evaluate the corrosion condition of the monitoring equipment, the invention further provides a specific determined corrosion protection standard, so that the corrosion state of the monitoring equipment, the corrosion condition of the material used by the monitoring equipment and the like can be determined according to the relation between the corrosion data and the determined corrosion protection standard, even the corrosion development degree can be predicted and the like, and then corresponding anti-corrosion measures can be respectively executed according to the corrosion state, the material influence and the like.
In one embodiment of the present invention, the uniform etch rate (X) is1Mm/a) may be the average corrosion rate during normal operation of the monitoring device over the last monitoring period, such as one week. The corrosion protection criterion includes a first predetermined value (V)1Mm/a) and a second predetermined value (V)2，mm/a)。
The first preset value can be, for example, a corrosion control index generally allowed by petroleum refining enterprises, such as 0.8-1.5 mm/a, and further such as 0.1 mm/a; the second preset value is greater than the first preset value. In particular, the second preset value is less than or equal to twice the first preset value, i.e. V1＜V2≤2V1For example 0.2 mm/a.
By comparing the uniform corrosion rate with the first preset value and the second preset value, the corrosion state of the monitoring equipment and the corrosion condition of the specific material in one or more recent monitoring periods under the specific corrosion environment can be determined, and the specific comparison results are shown in table 1 below. And, according to the comparative results in table 1, corrosion evaluation conclusions can be further given, and corresponding corrosion prevention measures can be implemented.
TABLE 1
| Size comparison | State of corrosion | Corrosion conditions | Comparison results |
| X1≤V1 | The corrosion rate does not exceed the standard | No serious corrosion of material | First result |
| V1＜X1≤V2 | Corrosion rate exceeding standard | Material is slightly corroded | Second result |
| X1＞V2 | The corrosion rate is seriously out of limits | Severe corrosion of material | The third result |
If the uniform corrosion rate does not exceed the first preset value, the comparison result is a first result, and the method specifically comprises the following steps: the corrosion rate of the monitoring equipment does not exceed the standard, and the corrosion of the material used by the monitoring equipment is not serious. The correspondingly obtained corrosion evaluation conclusion is: at this time, according to the monitoring data of the corrosion rate, the corrosion evaluation conclusion is as follows: the corrosion rate of the material is not overproof, which shows that the corrosion of the material is not serious. For example, if the distillation device of the normal three-line corrosion system of the oil refining production enterprise is used as a monitoring device and the material of the distillation device is specifically 1Cr5Mo, the corrosion evaluation conclusion is as follows: at this time, according to the monitoring data of the corrosion rate, the corrosion evaluation conclusion of the distillation device is as follows: the corrosion rate of the distillation device made of the 1Cr5Mo material is not over-standard, which indicates that the 1Cr5Mo material of the normal three-line corrosion system is not seriously corroded. "
If the uniform corrosion rate is greater than the first preset value and the uniform corrosion rate is less than or equal to the second preset value, the comparison result is a second result, and the method specifically comprises the following steps: the corrosion rate of the monitoring equipment exceeds the standard (but is not very serious), the material used by the monitoring equipment is corroded (but is not very serious), and the correspondingly obtained corrosion evaluation conclusion is as follows: at this time, according to the monitoring data of the corrosion rate, the corrosion evaluation conclusion is as follows: the corrosion rate of the material is slightly over standard, which shows that the material of the corrosion system is slightly corroded. "
If the uniform corrosion rate is greater than the second preset value, the comparison result is a third result, which specifically comprises: the corrosion rate of the monitoring equipment seriously exceeds the standard, the corrosion of the material used by the monitoring equipment is serious, and the correspondingly obtained corrosion evaluation conclusion is as follows: at this time, according to the monitoring data of the corrosion rate, the corrosion evaluation conclusion is as follows: the corrosion rate of the material is seriously exceeded, which shows that the material of the corrosion system is seriously corroded. "
According to the different comparison results, targeted preservation measures are performed respectively, see in particular 2.
TABLE 2
If the comparison result is the first result, the original material of the monitoring equipment can be continuously used as the corrosion rate does not exceed the standard and the material is not seriously corroded. Meanwhile, for safety, other devices related to the monitoring device are monitored, specifically, the remaining wall thickness of the corrosion-prone device and the pipeline of the whole corrosion system is monitored according to the first preset frequency/annual frequency, and once the thickness is reduced, the whole corrosion system is subjected to expansion inspection.
If the comparison result is a second result, the material of the monitoring equipment is optimized, namely the material of the monitoring equipment is upgraded and modified to improve the corrosion resistance because the corrosion rate slightly exceeds the standard and the material is slightly corroded; meanwhile, for the sake of safety, other devices related to the monitoring device are monitored, and according to a second preset number of times/annual frequency, the other devices related to the monitoring device are monitored, specifically, the remaining wall thickness of the corrosion-prone device and the pipeline of the whole corrosion system is monitored, and once the thickness is reduced, the whole corrosion system is subjected to extensive inspection.
If the comparison result is the third result, because the corrosion rate seriously exceeds the standard and the material is seriously corroded, the original material of the monitoring equipment cannot meet the requirement under the specific corrosion environment, even if the material is simply optimized, the requirement under the specific corrosion environment cannot be met, so the material of the monitoring equipment needs to be updated, namely a new material is used, so that the corrosion resistance of the monitoring equipment is improved; meanwhile, for the sake of safety, other devices related to the monitoring device are monitored, and according to a third preset number of times/frequency per year, the other devices related to the monitoring device are monitored, specifically, the remaining wall thickness of the corrosion-prone device and the pipeline of the whole corrosion system is monitored, and once the thickness is reduced, the whole corrosion system is subjected to extensive inspection.
The amplification detection frequency is increased along with the severity of the influence of the corrosion state and the corrosion material, namely, the third preset frequency is larger than the second preset frequency and larger than the first preset frequency. In the specific implementation process of the invention, the first preset number of times is 2 times, the second preset number of times is 4 times, and the third preset number of times is 6 times.
In another embodiment of the present invention, the uniform etch rate (X) is1Mm/a) may also be the average corrosion rate during normal operation of the monitoring device over the last plurality of monitoring periods (each monitoring period may for example be one week):
in the above formula (1), X01Representing the average corrosion rate, X, of the monitoring device during the last monitoring period02Indicating the average corrosion rate … … of the monitoring device during the last monitoring period of the most recent monitoring period, and so on.
As described above, the corrosion protection standard provided by the present invention may only include the first preset value and the second preset value, so as to divide the corrosion evaluation index into three levels. In the specific implementation process of the invention, the evaluation indexes can be divided into more layers according to actual requirements, particularly to the sensitivity of the monitoring equipment to the corrosion environment, the importance of the monitoring equipment in the oil refining process and other factors, so as to accurately determine the corrosion condition of the monitoring equipment and give more accurate corrosion evaluation, so as to finally make more targeted anticorrosion measures and further improve the corrosion prevention and control level of the refining device.
In yet another embodiment of the present invention, the corrosion data includes a uniform corrosion rate and a rate of change of the corrosion rate, wherein the uniform corrosion rate (X) is1Mm/a) is the average corrosion rate of the monitoring device during the last monitoring period; the method for determining the corrosion rate change rate comprises the following steps: the percentage change of the uniform corrosion rate relative to the average corrosion rate over a plurality of monitoring periods other than the last monitoring period is determined as the corrosion rate change rate.
Specifically, the rate of change of corrosion rate (X)2) The calculation method comprises the following steps:
wherein,to monitor the average corrosion rate of a device over a plurality of monitoring periods other than the last monitoring period:
accordingly, the corrosion protection criterion includes a third preset value in addition to the first preset value and the second preset value, and the third preset value is greater than 0.
If the corrosion rate change rate is greater than or equal to a third preset value, the comparison result further comprises: the corrosion rate of the monitoring equipment is increased, and the corrosion of the material used by the monitoring equipment tends to increase;
if the corrosion rate change rate is smaller than a third preset value, the comparison result further comprises: the corrosion rate of the monitoring equipment is reduced or unchanged, and the corrosion of the material used by the monitoring equipment does not increase or decrease;
if the comparison result is the first result and the corrosion rate change rate is greater than or equal to the third preset value, the correspondingly executed first anti-corrosion measure further comprises: optimizing the process anticorrosion measures of the production system to which the monitoring equipment belongs;
if the comparison result is a second result and the corrosion rate change rate is greater than or equal to a third preset value, the correspondingly executed second anti-corrosion measure further comprises: optimizing the process anticorrosion measures of the production system to which the monitoring equipment belongs or considering to reformulate the anticorrosion measures of the production system;
if the comparison result is a second result and the corrosion rate change rate is smaller than a third preset value, the correspondingly executed second anti-corrosion measure further comprises: optimizing the process anticorrosion measures of the production system to which the monitoring equipment belongs or considering to reformulate the anticorrosion measures of the production system;
if the comparison result is a third result and the corrosion rate change rate is greater than or equal to a third preset value, the correspondingly executed third corrosion prevention measure further includes: reformulating a process anticorrosion measure of a production system to which the monitoring equipment belongs;
if the comparison result is a third result and the corrosion rate change rate is smaller than a third preset value, the correspondingly executed third corrosion prevention measure further comprises: and reformulating the process anticorrosion measures of the production system to which the monitoring equipment belongs.
The third predetermined value (a%) is actually used to characterize the corrosion rate change and the material corrosion change degree in the last monitoring period, and is usually 3% to 6%, for example, 5%.
Once the change rate of the corrosion rate exceeds (including) a third preset value, the corrosion rate is considered to be increased, and the corrosion of the material used by the monitoring equipment tends to increase; if the corrosion rate change rate is smaller than the third preset value and is greater than or equal to the opposite number of the third preset value, the corrosion rate is considered to be unchanged, and the corrosion of the material used by the monitoring equipment does not increase; and if the corrosion rate change rate is smaller than the opposite number of the third preset value, the corrosion rate is reduced, and the corrosion of the material used by the monitoring equipment tends to be reduced.
Specifically, the relationship between the third preset value and the corrosion degree of the monitoring device is shown in table 3 below.
TABLE 3
| Range of variation | State of corrosion | Corrosion conditions |
| a％≤X2 | Increased corrosion rate | Material corrosion tends to increase |
| -a％＜X2＜a％ | The corrosion rate is not changed | No increasing tendency of material corrosion |
| X2≤-a％ | The corrosion rate becomes smaller | The material corrosion tends to be reduced |
And (3) combining the corrosion evaluation conclusion formed by the uniform corrosion rate, evaluating the corrosion development trend, and integrating the evaluation conclusion according to a mode of 'same item combination, different item retention and outstanding problem', such as: if the comparison result is the first result and the second corrosion data is greater than or equal to the third preset value, the corrosion evaluation conclusion obtained correspondingly is that: "this time, in the device corrosion system, according to the monitoring data of the corrosion rate, the evaluation conclusion of the corrosion degree is as follows: the corrosion rate of the material is not overproof, which shows that the corrosion of the material is not serious. The evaluation conclusion of the corrosion development trend is as follows: the material corrosion rate increases, and the material corrosion tends to increase. "other cases may also give corresponding evaluation conclusions and are not described here too much.
By integrating the corrosion evaluation conclusion and the corrosion development trend evaluation conclusion, the finally formed corrosion evaluation conclusion is more targeted, and the reliable corrosion evaluation on the equipment and the pipeline material of the monitored corrosion part is finally realized, so that the aim of accurately preventing and controlling the corrosion of the monitored corrosion system is fulfilled.
Specifically, if the comparison result is the first result and the corrosion rate change rate is greater than or equal to the third preset value, the correspondingly executed first anti-corrosion measure further includes: optimizing the process anticorrosion measures of the production system to which the monitoring equipment belongs; by optimizing the original corrosion protection measures, the trend of increasing the corrosion rate is effectively inhibited or even avoided.
Of course, if the comparison result is the first result and the corrosion rate change rate is smaller than the third preset value, which indicates that the corrosion of the equipment is controlled within a very stable range, the original corrosion protection measures can be continuously implemented, the material of the monitoring equipment is continuously used, and other equipment of the monitoring equipment is monitored according to the first preset frequency/annual frequency.
If the comparison result is a second result and the corrosion rate change rate is greater than or equal to a third preset value, which indicates that the current corrosion rate slightly exceeds the standard, the material is slightly corroded, and the corrosion rate tends to continuously increase, the correspondingly executed second anti-corrosion measure further comprises: optimizing the process anticorrosion measures of the production system to which the monitoring equipment belongs or considering to reformulate the anticorrosion measures of the production system; to inhibit or even avoid the above-mentioned tendency of the corrosion rate to continue to increase.
If the comparison result is a second result and the corrosion rate change rate is smaller than a third preset value, although the corrosion rate increase trend is not obvious, in order to control the corrosion rate within a reasonable range, the correspondingly executed second anti-corrosion measures further comprise: optimizing the process anticorrosion measures of the production system to which the monitoring equipment belongs or considering to reformulate the anticorrosion measures of the production system;
if the comparison result is a third result and the corrosion rate change rate is greater than or equal to a third preset value, which indicates that the corrosion rate seriously exceeds the standard, the material corrosion is serious, and the corrosion rate has a trend of continuously increasing, the correspondingly executed third corrosion prevention measure further comprises: reformulating a process anticorrosion measure of a production system to which the monitoring equipment belongs; furthermore, new process anti-corrosion measures should be implemented and popularized as soon as possible, otherwise normal oil refining production is easily affected.
Similarly, if the comparison result is a third result and the corrosion rate change rate is smaller than a third preset value, the correspondingly executed third corrosion prevention measure further includes: and reformulating the process anticorrosion measures of the production system to which the monitoring equipment belongs.
On the basis, the corrosion rate change condition can be further subdivided, that is, the third preset value comprises a plurality of corrosion rate change levels, for example, c%, b% and a%, and c% is greater than b% and greater than a% and greater than 0, and meanwhile, the judgment relationship between the third preset value and the corrosion degree of the monitoring device is shown in the following table 4.
TABLE 4
Then, according to the situation, the anti-corrosion measures can be correspondingly adjusted and further refined so as to provide reliable and feasible anti-corrosion measures, effectively improve the corrosion control level of the refining device, prevent the occurrence of sudden corrosion leakage accidents and provide guarantee for the long-period operation of the refining device.
Another aspect of the present invention provides an apparatus for implementing the above method, including:
the acquisition module is used for acquiring corrosion data of the monitoring equipment;
the comparison module is used for comparing the corrosion data with the corrosion protection standard and obtaining the comparison result;
and the management module is used for indicating to execute corresponding anticorrosion measures according to different comparison results.
Specifically, the corrosion protection standard includes a first preset value and a second preset value both greater than zero, and the first preset value is smaller than the second preset value,
if the uniform corrosion rate is less than or equal to a first preset value, the comparison result obtained by the comparison module is a first result, and the management module correspondingly indicates that the executed anticorrosion measure is a first anticorrosion measure, wherein the first result comprises: the corrosion rate of the monitoring equipment does not exceed the standard, and the corrosion of the material used by the monitoring equipment is not serious; the first preservative measure comprises: continuously using the materials used by the monitoring equipment, and monitoring the production system to which the monitoring equipment belongs according to the first preset frequency/annual frequency;
if the uniform corrosion rate is greater than the first preset value and less than or equal to a second preset value, the comparison result obtained by the comparison module is a second result, and the management module correspondingly indicates that the executed anticorrosion measure is a second anticorrosion measure, wherein the second result comprises: the corrosion rate of the monitoring equipment exceeds the standard, and the material used by the monitoring equipment is corroded; the second preservative measure comprises: considering upgrading of the materials used by the monitoring equipment and monitoring other equipment related to the monitoring equipment according to the second preset frequency/annual frequency;
if the uniform corrosion rate is greater than the second preset value, the comparison result obtained by the comparison module is a third result, and the management module correspondingly indicates that the executed anticorrosion measure is a third anticorrosion measure, wherein the third result comprises: the corrosion rate of the monitoring equipment seriously exceeds the standard, and the material used by the monitoring equipment is seriously corroded; the third corrosion prevention measure comprises the following steps: upgrading the material used by the monitoring equipment, and monitoring other equipment related to the monitoring equipment according to a third preset frequency/annual frequency;
the third preset times is greater than the second preset times, and the second preset times is greater than the first preset times.
Further, the uniform corrosion rate is an average corrosion rate of the monitoring device in a last monitoring period, and the obtaining module is further configured to obtain a corrosion rate change rate, where the obtaining process of the corrosion rate change rate includes:
determining a percentage change in the uniform corrosion rate relative to an average corrosion rate over a plurality of monitoring periods other than a most recent monitoring period as a corrosion rate change rate;
the corrosion protection standard also comprises a third preset value, and the third preset value is more than 0;
the comparison module is also used for comparing the corrosion rate change rate with a third preset value;
if the corrosion rate change rate is greater than or equal to a third preset value, the comparison result further comprises: the corrosion rate of the monitoring equipment is increased, and the corrosion of the material used by the monitoring equipment tends to increase;
if the corrosion rate change rate is smaller than a third preset value, the comparison result further comprises: the corrosion rate of the monitoring equipment is reduced or unchanged, and the corrosion of the material used by the monitoring equipment does not increase or decrease;
if the comparison result is the first result and the corrosion rate change rate is greater than or equal to the third preset value, the first anticorrosion measure executed by the management module further includes: optimizing the process anticorrosion measures of the production system to which the monitoring equipment belongs;
if the comparison result is a second result and the corrosion rate change rate is greater than or equal to a third preset value, the second anticorrosion measure executed by the management module further comprises: optimizing the process anticorrosion measures of the production system to which the monitoring equipment belongs or considering to reformulate the anticorrosion measures of the production system;
if the comparison result is a second result and the corrosion rate change rate is smaller than a third preset value, the second anticorrosion measure executed by the management module further comprises: optimizing the process anticorrosion measures of the production system to which the monitoring equipment belongs or considering to reformulate the anticorrosion measures of the production system;
if the comparison result is a third result and the corrosion rate change rate is greater than or equal to a third preset value, the third corrosion prevention measure executed by the management module further includes: reformulating a process anticorrosion measure of a production system to which the monitoring equipment belongs;
if the comparison result is a third result and the corrosion rate change rate is smaller than a third preset value, the third corrosion prevention measure executed by the management module further includes: and reformulating the process anticorrosion measures of the production system to which the monitoring equipment belongs.
Furthermore, the management module is further used for outputting a corresponding corrosion evaluation conclusion according to different comparison results.
Specifically, when the comparison result is the first result, the corrosion evaluation conclusion indicated by the management module is as follows: "this time, in the device, based on the monitored data of the corrosion rate, the corrosion evaluation is considered as follows: the corrosion rate of the material is not overproof, which shows that the corrosion of the material is not serious. For example, if the distillation apparatus of the normal three-line corrosion system of the oil refining manufacturing enterprise is used as the monitoring device, and the material of the distillation apparatus is specifically 1Cr5Mo, the corrosion evaluation conclusion indicated by the management module is as follows: at this time, according to the monitoring data of the corrosion rate, the corrosion evaluation of the distillation device is considered as follows: the corrosion rate of the distillation device made of the 1Cr5Mo material is not over-standard, which indicates that the 1Cr5Mo material of the normal three-line corrosion system is not seriously corroded. "
When the comparison result is a second result, the corrosion evaluation conclusion indicated by the management module is that: "this time, in the device, based on the monitored data of the corrosion rate, the corrosion evaluation is considered as follows: the corrosion rate of the material is slightly over standard, which shows that the material of the corrosion system is slightly corroded. "
When the comparison result is a third result, the corrosion evaluation conclusion indicated by the management module is that: "this time, in the device, based on the monitored data of the corrosion rate, the corrosion evaluation is considered as follows: the corrosion rate of the material is seriously exceeded, which shows that the material of the corrosion system is seriously corroded. "
The management module indicates a corrosion evaluation conclusion and indicates to execute corresponding corrosion prevention measures through the computer intelligent evaluation language, so that the intelligent corrosion control level of the refining device can be effectively improved, and the operation of field technicians is easier.
The method for corrosion protection of equipment provided by the invention comprises the steps of firstly determining a corrosion protection standard and obtaining corrosion data such as uniform corrosion rate of monitoring equipment, then establishing corresponding corrosion reduction control measures by dividing the corrosion rate grade and predicting the material corrosion development trend, judging the corrosion condition of the equipment and pipeline in a monitoring corrosion system, and providing feasible corrosion reduction control measures, so that the corrosion control level of an refining device can be effectively improved, the occurrence of sudden corrosion leakage accidents is prevented, and the technical guarantee is provided for the long-period operation of the refining device.
Meanwhile, the corrosion evaluation conclusion given by the corrosion data is more pertinent, the operation of field technicians is easier, and the corrosion system is easy to be accurately controlled.
The device for corrosion protection of equipment provided by the invention can execute the method for corrosion protection of equipment, and effectively improve the intelligent corrosion control level of the refining device.
Drawings
The drawings in the following description are only some embodiments of the invention, and other drawings can be derived by those skilled in the art without inventive exercise.
FIG. 1 is a schematic diagram of a typical conventional three-wire corrosion system;
FIG. 2 is a schematic flow chart illustrating a method for corrosion protection of equipment according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Unless otherwise specified, the unit "mm/a" in the present invention refers to "mm/year".
An embodiment of the present invention provides a method for performing corrosion protection on equipment, and fig. 2 is a schematic flow chart of the method for performing corrosion protection on equipment provided in this embodiment, as shown in fig. 1, specifically including the following steps:
step 1, determining a corrosion protection standard;
step 2, obtaining corrosion data of the monitoring equipment;
step 3, comparing the corrosion data with a preset value to obtain a comparison result;
and 4, executing corresponding anticorrosion measures according to different comparison results.
Wherein: the corrosion data includes a uniform corrosion rate, the uniform corrosion rate being an average corrosion rate of the monitoring device over a most recent monitoring period or periods;
the comparison result comprises the corrosion state of the monitoring equipment and the corrosion condition of the material used by the monitoring equipment.
If the comparison result is a first result, executing a first anticorrosion measure;
if the comparison result is a second result, executing a second anticorrosion measure;
and if the comparison result is a third result, executing a third corrosion prevention measure.
Example one
In this embodiment, a distillation apparatus (atmospheric tower) of a normal three-line corrosion system (as shown in fig. 1) of an oil refining manufacturing enterprise is used as a monitoring device, the material of the distillation apparatus is 1Cr5Mo, and an online corrosion rate probe monitoring technology is adopted to obtain an average corrosion rate (X) of the distillation apparatus in a latest monitoring period (around 06 months in 2017, 7 × 24 hours)1)。
The corrosion control index allowed by the normal three-line corrosion system is used as a first preset value (V)1) In particular 0.1mm/a, second predetermined value (V)2) 0.2mm/a, and the evaluation of the influence on the corrosion state and the corrosion quality was obtained as shown in Table 5.
TABLE 5 (unit: mm/a)
And according to the comparison result, giving a corresponding corrosion evaluation conclusion, wherein:
if X1And (5) being less than or equal to 0.1, and the comparison result is the first result, then the corrosion evaluation conclusion is that: at this time, according to the monitoring data of the corrosion rate, the corrosion evaluation conclusion of the distillation device is as follows: the corrosion rate of the distillation device made of the 1Cr5Mo material is not over-standard, which indicates that the 1Cr5Mo material of the normal three-line corrosion system is not seriously corroded. "
If 0.1 < X1And less than or equal to 0.2, and the comparison result is a second result, the corrosion evaluation conclusion is that: at this time, according to the monitoring data of the corrosion rate, the corrosion evaluation conclusion of the distillation device is as follows: the corrosion rate of the 1Cr5Mo material is slightly over-standard, which indicates that the 1Cr5Mo material of the normal three-line corrosion system is slightly corroded. "
If X1If the comparison result is a third result, the corrosion evaluation conclusion is that: at this time, according to the monitoring data of the corrosion rate, the corrosion evaluation conclusion of the distillation device is as follows: the corrosion rate of the 1Cr5Mo material is seriously exceeded, which indicates that the 1Cr5Mo material of the normal three-line corrosion system is seriously corroded. "
The correspondingly performed corrosion protection measures are shown in table 6.
TABLE 6
Tests show that the average corrosion rate in the last monitoring period is 0.004mm/a, the corrosion rate of the 1Cr5Mo material is not out of standard, the corrosion of the 1Cr5Mo material in a normal three-wire corrosion system is not serious, the first anti-corrosion measure can be implemented, specifically, the residual wall thickness of equipment and pipelines which are easy to corrode is monitored, and if thinning is found, the whole system is subjected to expansion inspection.
Example two
In this embodiment, the distillation apparatus of the normal third line corrosion system of the oil refining manufacturing enterprise is also used as a monitoring device, and an online corrosion rate probe monitoring technology is adopted to obtain the uniform corrosion rate of the distillation apparatus made of 1Cr5Mo material in the normal third line corrosion environment, wherein the average corrosion rates in the last five monitoring periods are respectively shown in table 7 below.
TABLE 7 (Unit: mm/a)
First preset value (V)1) 0.1mm/a, a second predetermined value (V)2) At 0.2mm/a, the corrosion state and the influence of corrosion on the corrosion system were also evaluated, and Table 5 was referred to.
Calculating the average corrosion rate (X) of the distillation apparatus during the five monitoring periods1) The specific calculation result is as follows:
comparing the average corrosion rate with the corrosion protection standard, it is obvious that the average corrosion rate is less than the first preset value, which indicates that the corrosion rate does not exceed the standard, and the corrosion of the material of the normal three-line corrosion system 1Cr5Mo is not serious. Then, the corrosion evaluation conclusion is: at this time, according to the monitoring data of the corrosion rate, the corrosion evaluation conclusion of the distillation device is as follows: the corrosion rate of the distillation device made of the 1Cr5Mo material is not over-standard, which indicates that the 1Cr5Mo material of the normal three-line corrosion system is not seriously corroded. "
And then, implementing a first anti-corrosion measure, specifically monitoring the residual wall thickness of the equipment and the pipeline which are easy to corrode, and if thinning is found, performing extensive inspection on the whole system.
EXAMPLE III
In this embodiment, the distillation apparatus of the normal third line corrosion system of the oil refining manufacturing enterprise is also used as the monitoring device, and the online corrosion rate probe monitoring technology is adopted to obtain the uniform corrosion rate of the distillation apparatus made of 1Cr5Mo material in the normal third line corrosion environment, wherein the average corrosion rates in the last five monitoring periods are respectively shown in table 7.
The corrosion data includes a uniform corrosion rate and a rate of change of corrosion rate, wherein:
the uniform corrosion rate is the average corrosion rate of the distillation apparatus in the last monitoring period (fourth of 06 months in 2017), i.e. 0.004 mm/a;
the average corrosion rate for the four other monitoring cycles (four weeks 05 in 2017 to three weeks 06 in 2017) except the last monitoring cycle was (0.007+0.005+0.007+ 0.003)/4-0.0055 mm/a, and the corrosion rate change rate was calculated as:
the corrosion protection standard is determined to comprise a first preset value, a second preset value and a third preset value, wherein the first preset value and the second preset value can be seen in the first embodiment and are respectively 0.1mm/a and 0.2mm/a, and the third preset value is set to be 5%. The relationship between the third preset value and the corrosion degree of the monitoring device is shown in the following table 8.
TABLE 8
| Comparison results | Range of variation | Change in corrosion rate | Influence of corrosion rate change on material quality |
| Increase of | 5％≤X2 | Increased corrosion rate | Material corrosion tends to increase |
| Is not changed | -5％＜X2＜5％ | The corrosion rate is not changed | No increasing tendency of material corrosion |
| Become smaller | X2＜-5％ | The corrosion rate becomes smaller | The material corrosion tends to be reduced |
It is clear that-37.5% < -5%, further combining the first corrosion data (X) in example one1) The comparison result with the corrosion protection standard is determined as a first result, and the evaluation conclusion of the material corrosion development trend with the corrosion reduction control measures is obtained according to the comparison result in the table 8: at this time, in the distillation apparatus, the normal three-line corrosion systemAccording to the monitoring data of the corrosion rate, the evaluation conclusion of the corrosion degree is as follows: the corrosion rate of the 1Cr5Mo material is not over-standard, which indicates that the 1Cr5Mo material of the normal three-line corrosion system is not seriously corroded. The evaluation conclusion of the corrosion development trend is as follows: the corrosion rate of the 1Cr5Mo material is reduced, and the corrosion of the 1Cr5Mo material tends to be reduced. "
And further provides anticorrosion measures, wherein the method is that materials in the normal three-line corrosion system are recommended ① to be normally used, the ② monitors the residual wall thickness of equipment and pipelines easy to corrode in the normal three-line corrosion system at the frequency of 2 times per year, the whole system is detected and thinned, and the process anticorrosion measures of the normal three-line corrosion system are optimized.
Example four
The present embodiment provides a device for corrosion protection of equipment, which is specifically used for performing the method for corrosion protection of a distillation device of a normal three-line corrosion system described in the first to third embodiments. The detailed description of the functions is omitted here.
It should be noted that the terms "first" and "second" in the description of the present invention are used merely for convenience in describing different parameters or numerical values, and are not to be construed as indicating or implying a sequential relationship, relative importance or implicitly indicating the number of technical features indicated.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for evaluating material corrosion by using uniform corrosion rate is characterized by comprising the following steps:
determining a corrosion protection standard;
obtaining corrosion data of a monitoring device, wherein the corrosion data comprises a uniform corrosion rate, and the uniform corrosion rate is an average corrosion rate of the monitoring device in one or more recent monitoring periods;
comparing the corrosion data with the corrosion protection standard to obtain a comparison result, wherein the comparison result comprises the corrosion state of the monitoring equipment and the corrosion condition of the material used by the monitoring equipment;
and executing corresponding anticorrosion measures according to the comparison result.
2. The method of claim 1, wherein the uniform corrosion rate is measured by an online corrosion rate probe, an online bypass test pot corrosion coupon, or a spot thickness measurement technique.
3. The method of claim 1, wherein the corrosion protection criteria includes a first preset value and a second preset value, both greater than zero, and the first preset value is less than the second preset value,
if the uniform corrosion rate is less than or equal to a first preset value, the comparison result is a first result, and a first anticorrosion measure is correspondingly executed, wherein the first result comprises: the corrosion rate of the monitoring equipment does not exceed the standard, and the corrosion of the material used by the monitoring equipment is not serious; the first preservative measure comprises: continuously using the materials used by the monitoring equipment, and monitoring the production system to which the monitoring equipment belongs according to a first preset frequency/annual frequency;
if the uniform corrosion rate is greater than the first preset value and less than or equal to a second preset value, the comparison result is a second result, and a second anticorrosion measure is correspondingly executed, wherein the second result comprises: the corrosion rate of the monitoring equipment exceeds the standard, and the material used by the monitoring equipment is corroded; the second preservative measure comprises: considering upgrading of the materials used by the monitoring equipment and monitoring other equipment related to the monitoring equipment according to a second preset frequency/annual frequency;
if the uniform corrosion rate is greater than a second preset value, the comparison result is a third result, and a third corrosion prevention measure is correspondingly executed, wherein the third result comprises: the corrosion rate of the monitoring equipment seriously exceeds the standard, and the material used by the monitoring equipment is seriously corroded; the third corrosion prevention measure comprises: upgrading the material used by the monitoring equipment, and monitoring other equipment related to the monitoring equipment according to a third preset frequency/annual frequency;
the third preset times is greater than the second preset times, and the second preset times is greater than the first preset times.
4. The method according to claim 3, wherein the first preset value is 0.8-1.5 mm/a, and the second preset value is less than or equal to twice the first preset value.
5. The method of claim 3 or 4, wherein the uniform corrosion rate is an average corrosion rate of the monitoring device over a last monitoring period, the corrosion data further comprises a rate of change of corrosion rate, and the method of determining the rate of change of corrosion rate comprises:
determining a percentage change in the uniform corrosion rate relative to an average corrosion rate over a plurality of monitoring periods other than a most recent monitoring period as the corrosion rate change rate;
the corrosion protection standard also comprises a third preset value, and the third preset value is more than 0;
if the corrosion rate change rate is greater than or equal to a third preset value, the comparison result further comprises: the corrosion rate of the monitoring equipment is increased, and the corrosion of the material used by the monitoring equipment tends to increase;
if the corrosion rate change rate is smaller than a third preset value, the comparison result further comprises: the corrosion rate of the monitoring equipment is reduced or unchanged, and the corrosion of the material used by the monitoring equipment does not increase or decrease;
if the comparison result is the first result and the corrosion rate change rate is greater than or equal to the third preset value, the correspondingly executed first anticorrosion measures further comprise: optimizing the process anticorrosion measures of the production system to which the monitoring equipment belongs;
if the comparison result is a second result and the corrosion rate change rate is greater than or equal to a third preset value, the correspondingly executed second anti-corrosion measure further comprises: optimizing the process anticorrosion measures of the production system to which the monitoring equipment belongs or considering to reformulate the anticorrosion measures of the production system;
if the comparison result is a second result and the corrosion rate change rate is smaller than a third preset value, the correspondingly executed second anti-corrosion measure further comprises: optimizing the process anticorrosion measures of the production system to which the monitoring equipment belongs or considering to reformulate the anticorrosion measures of the production system;
if the comparison result is a third result and the corrosion rate change rate is greater than or equal to a third preset value, the correspondingly executed third corrosion prevention measure further includes: reformulating a process anticorrosion measure of a production system to which the monitoring equipment belongs;
if the comparison result is a third result and the corrosion rate change rate is smaller than a third preset value, the correspondingly executed third corrosion prevention measure further comprises: and reformulating the process anticorrosion measures of the production system to which the monitoring equipment belongs.
6. The method according to claim 5, wherein the third preset value is 3% to 6%.
7. An apparatus for implementing the method of any one of claims 1-6, comprising:
the acquisition module is used for acquiring corrosion data of the monitoring equipment;
the comparison module is used for comparing the corrosion data with the corrosion protection standard and obtaining the comparison result;
and the management module is used for indicating to execute corresponding anticorrosion measures according to different comparison results.
8. The apparatus of claim 7, wherein the corrosion protection criteria includes a first preset value and a second preset value, both greater than zero, and the first preset value is less than the second preset value,
if the uniform corrosion rate is less than or equal to a first preset value, the comparison result obtained by the comparison module is a first result, and the management module correspondingly indicates that the executed anticorrosion measure is a first anticorrosion measure, wherein the first result comprises: the corrosion rate of the monitoring equipment does not exceed the standard, and the corrosion of the material used by the monitoring equipment is not serious; the first preservative measure comprises: continuously using the materials used by the monitoring equipment, and monitoring the production system to which the monitoring equipment belongs according to a first preset frequency/annual frequency;
if the uniform corrosion rate is greater than the first preset value and less than or equal to a second preset value, the comparison result obtained by the comparison module is a second result, and the management module correspondingly indicates that the executed anticorrosion measure is a second anticorrosion measure, wherein the second result comprises: the corrosion rate of the monitoring equipment exceeds the standard, and the material used by the monitoring equipment is corroded; the second preservative measure comprises: considering upgrading of the materials used by the monitoring equipment and monitoring other equipment related to the monitoring equipment according to a second preset frequency/annual frequency;
if the uniform corrosion rate is greater than a second preset value, the comparison result obtained by the comparison module is a third result, and the management module correspondingly indicates that the executed anticorrosion measure is a third anticorrosion measure, wherein the third result comprises: the corrosion rate of the monitoring equipment seriously exceeds the standard, and the material used by the monitoring equipment is seriously corroded; the third corrosion prevention measure comprises: upgrading the material used by the monitoring equipment, and monitoring other equipment related to the monitoring equipment according to a third preset frequency/annual frequency;
the third preset times is greater than the second preset times, and the second preset times is greater than the first preset times.
9. The apparatus of claim 8, wherein the uniform corrosion rate is an average corrosion rate of the monitoring device in a last monitoring period, and the obtaining module is further configured to obtain a corrosion rate change rate, wherein the obtaining of the corrosion rate change rate includes:
determining a percentage change in the uniform corrosion rate relative to an average corrosion rate over a plurality of monitoring periods other than a most recent monitoring period as the corrosion rate change rate;
the corrosion protection standard also comprises a third preset value, and the third preset value is more than 0;
the comparison module is also used for comparing the corrosion rate change rate with a third preset value;
if the corrosion rate change rate is greater than or equal to a third preset value, the comparison result further comprises: the corrosion rate of the monitoring equipment is increased, and the corrosion of the material used by the monitoring equipment tends to increase;
if the corrosion rate change rate is smaller than a third preset value, the comparison result further comprises: the corrosion rate of the monitoring equipment is reduced or unchanged, and the corrosion of the material used by the monitoring equipment does not increase or decrease;
if the comparison result is the first result and the corrosion rate change rate is greater than or equal to a third preset value, the first anticorrosion measure instructed to be executed by the management module further comprises: optimizing the process anticorrosion measures of the production system to which the monitoring equipment belongs;
if the comparison result is a second result and the corrosion rate change rate is greater than or equal to a third preset value, the second anticorrosion measure executed by the management module further comprises: optimizing the process anticorrosion measures of the production system to which the monitoring equipment belongs or considering to reformulate the anticorrosion measures of the production system;
if the comparison result is a second result and the corrosion rate change rate is smaller than a third preset value, the second anticorrosion measure executed by the management module further comprises: optimizing the process anticorrosion measures of the production system to which the monitoring equipment belongs or considering to reformulate the anticorrosion measures of the production system;
if the comparison result is a third result and the corrosion rate change rate is greater than or equal to a third preset value, the third corrosion prevention measure executed by the management module further includes: reformulating a process anticorrosion measure of a production system to which the monitoring equipment belongs;
if the comparison result is a third result and the corrosion rate change rate is smaller than a third preset value, the third corrosion prevention measure executed by the management module further includes: and reformulating the process anticorrosion measures of the production system to which the monitoring equipment belongs.
10. The apparatus according to any one of claims 7 to 9, wherein the management module is further configured to output a corresponding corrosion evaluation conclusion according to the different comparison results.
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