CN105466845B - A kind of overcritical equipment and its corrosion monitoring process - Google Patents
A kind of overcritical equipment and its corrosion monitoring process Download PDFInfo
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Abstract
The present invention discloses a kind of overcritical equipment and its corrosion monitoring process, is related to equipment corrosion monitoring technology field, to solve the problem of that the corrosion condition of the existing overcritical equipment liner of overcritical equipment in actual use can not be by accurate judgement.The overcritical equipment includes: apparatus casing and the liner that is located inside apparatus casing；Wherein, liner successively includes intermediate protective layer, intermediate marker and anti-corrosion layer from outside to inside; at least contain a kind of characteristic element in intermediate marker, the characteristic element is can dissolve out the element in the medium contained inside the overcritical equipment when the intermediate marker is corroded.The overcritical equipment corrosion monitoring process is used to monitor the corrosion condition of the liner of above-mentioned overcritical equipment.Overcritical equipment provided by the invention is used to provide reacting environment for supercritical reaction.
Description
Technical field
The present invention relates to equipment corrosion monitoring technology field more particularly to a kind of overcritical equipment and its corrosion monitoring sides
Method.
Background technique
With the continuous improvement of quality of life, the pollutants such as municipal wastewater, industrial sludge also accordingly increase, and handle these
Supercritical Water Oxidation Technology applied by pollutant is needed in the anti-of the harshnesses such as high temperature (being greater than 500 DEG C), high pressure (being greater than 23MPa)
It is carried out under the conditions of answering, under this reaction condition, the medium contained inside overcritical equipment can be to the liner of overcritical equipment
Certain corrosion and abrasion are caused, when the degree of the corrosion of the liner of overcritical equipment or abrasion is more serious, will be surpassed
Marginal devices rupture suddenly, or even the safety accidents such as explosion, therefore, design to inner lining structure in overcritical equipment and right
The monitoring of overcritical equipment service condition is always chemical company's focus of attention.
Currently, the liner in overcritical equipment generally comprises anti-corrosion layer and intermediate protective layer, and the liner of this structure
During use, it is merely able to measure its average corrosion rate, the corrosion feelings of liner is judged further according to average corrosion rate
Condition is thus easy to appear the problem of corrosion condition of liner can not be by accurate judgement.
Summary of the invention
The purpose of the present invention is to provide a kind of overcritical equipment and its corrosion monitoring process, for solving existing super face
Boundary's equipment in actual use, the problem of corrosion condition of the liner of overcritical equipment can not be by accurate judgement.
To achieve the goals above, the invention provides the following technical scheme:
A kind of overcritical equipment, comprising: apparatus casing and the liner being located inside the apparatus casing；Wherein, described
Liner successively includes intermediate protective layer, intermediate marker and anti-corrosion layer from outside to inside, is at least contained in the intermediate marker
There is a kind of characteristic element, the characteristic element is that the overcritical equipment can be dissolved out when the intermediate marker is corroded
The element in medium that inside is contained.
The present invention also provides a kind of overcritical equipment corrosion monitoring process, for monitoring the liner of above-mentioned overcritical equipment
Corrosion condition, the overcritical equipment corrosion monitoring process the following steps are included:
Step 101, contained in the element species according to contained in the intermediate marker and the anti-corrosion layer
Element species, determine the characteristic element to be monitored, the characteristic element is can when the intermediate marker is corroded
Dissolve out the element in the medium contained inside the overcritical equipment；
Step 102, the content of characteristic element described in the medium contained inside the overcritical equipment is monitored；
Step 103, the variation of the content of the characteristic element according to the medium contained inside the overcritical equipment
Judge the extent of corrosion of the liner.
Compared with prior art, the beneficial effects of the present invention are:
In overcritical equipment provided by the invention, with the progress of its internal supercritical reaction, inside overcritical equipment
The medium contained can be successively by anti-corrosion layer, intermediate marker and intermediate protective layer corrosion failure；It is rotten in anti-corrosion layer
After erosion failure, when the medium contained inside overcritical equipment starts to corrode intermediate marker, due to intermediate marker
In at least contain a kind of characteristic element, and when intermediate marker is corroded, characteristic element can be dissolved out in overcritical equipment
In the medium that portion is contained, so that the content of characteristic element changes in the medium contained inside overcritical equipment；In this way
It is special in the medium contained inside the different corrosion stage, overcritical equipment as the extent of corrosion of intermediate marker increases
The content of sign element will be different；Therefore, in the use process of overcritical equipment, its internal Jie contained need to only be monitored
The variation of characteristic element in matter, it will be able to accurately judge the corrosion condition of the liner of overcritical equipment.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of the invention, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of the liner of overcritical equipment provided in an embodiment of the present invention；
Fig. 2 is the flow chart of overcritical equipment corrosion monitoring process provided in an embodiment of the present invention.
Appended drawing reference:
1- intermediate protective layer, the centre 2- marker,
3- anti-corrosion layer.
Specific embodiment
The overcritical equipment and its corrosion monitoring process that embodiment provides in order to further illustrate the present invention, below with reference to saying
Bright book attached drawing is described in detail.
Referring to Fig. 1, overcritical equipment provided in an embodiment of the present invention includes: apparatus casing and is located in apparatus casing
The liner in portion；Wherein, liner successively includes intermediate protective layer 1, intermediate marker 2 and anti-corrosion layer 3 from outside to inside, and centre refers to
Show that characteristic element is that can dissolve out overcritical set when intermediate marker 2 is corroded at least containing a kind of characteristic element in layer 2
The element in medium that standby inside is contained.
When in use, raw material needed for carrying out supercritical reaction is added in overcritical equipment above-mentioned overcritical equipment
Portion, and high temperature, condition of high voltage needed for setting supercritical reaction for the environmental condition inside overcritical equipment, so that overcritical
Reaction is gone on smoothly inside overcritical equipment；And with the progress of supercritical reaction, staff can be to overcritical equipment
The content for the characteristic element in medium that inside is contained is monitored, according to special in the medium contained inside overcritical equipment
The variation for levying constituent content, judges the corrosion condition of the liner of overcritical equipment.
In overcritical equipment provided in this embodiment, with the progress of its internal supercritical reaction, in overcritical equipment
The medium that portion is contained can be successively by anti-corrosion layer 3, intermediate marker 2 and 1 corrosion failure of intermediate protective layer；In anti-corrosion layer
3 are corroded after failure, when the medium contained inside overcritical equipment starts to corrode intermediate marker 2, due to centre
At least contain a kind of characteristic element in marker 2, and when intermediate marker 2 is corroded, characteristic element can dissolve out super face
In the medium contained inside boundary's equipment, so that the content of characteristic element becomes in the medium contained inside overcritical equipment
Change；In this way as intermediate marker 2 is corroded the increasing of degree, contained inside the different corrosion stage, overcritical equipment
Medium in the content of characteristic element will be different；Therefore, it in the use process of overcritical equipment, need to only monitor inside it
Characteristic element in the medium contained, it will be able to accurately judge the corrosion condition of the liner of overcritical equipment.
In addition, above-mentioned intermediate protective layer 1 also has certain corrosion resistance, when intermediate marker 2, which is corroded, to fail, in
Between protective layer 1 can play certain protective action, overcritical equipment goes out caused by being corroded to avoid occurrence of equipment shell
Now the phenomenon that leakage suddenly.
In the liner of above-mentioned overcritical equipment, auxiliary isolation can also be equipped between apparatus casing and intermediate protective layer 1
Layer, and/or, auxiliary separation layer is equipped between intermediate protective layer 1 and intermediate marker 2, and/or, in intermediate marker 2 and resistance to
Auxiliary separation layer is equipped between corrosion layer 3, and assisting separation layer includes at least one layer of intermediate protective layer 1 and/or at least one layer
Between marker 3.Since auxiliary separation layer includes at least one layer of intermediate protective layer 1 and/or at least one layer of intermediate marker 2, can make
Obtaining overcritical equipment, there are a variety of different inner lining structures, two various specific inner lining structures are given below, to different structure
Liner caused by difference beneficial effect be described in detail.
When at least one layer of intermediate protective layer 1 being equipped in above three position and/or at least one layer of intermediate marker 2, make
Obtain successively includes at least one layer of intermediate protective layer 1, at least one layer of intermediate marker 2 and anti-corrosion layer 3 in liner from outside to inside
When, it is equivalent to the thickness for having thickeied intermediate protective layer 1 and/or intermediate marker 2；In this case, due in liner
Between the thickness of protective layer 1 and/or intermediate marker 2 thicken, allow for the anticorrosive of intermediate protective layer 1 and/or intermediate marker 2
Ability is stronger, extends the service life of overcritical equipment accordingly.
When at least one layer of intermediate protective layer 1 being equipped in above three position and/or at least one layer of intermediate marker 2, make
Include one layer of anti-corrosion layer 3, marker 2 and multilayer intermediate protective layer 1 among multilayer in liner, and marker among multilayer
2 and when the setting of the interval of multilayer intermediate protective layer 1, with the progress of supercritical reaction in overcritical equipment, inside overcritical equipment
The medium contained can carry out corrosion one by one to by marker 2 among spaced multilayer, and in every corresponding one layer of corrosion
Between marker 2, the characteristic element in intermediate marker 2 will be dissolved in the medium contained inside overcritical equipment, make
The content for obtaining characteristic element in the medium contained inside overcritical equipment constantly changes, and staff can be by right
The content of the characteristic element in medium contained inside overcritical equipment carries out real-time monitoring, to obtain in overcritical equipment
Serve as a contrast the corrosion condition in the differential responses stage；In addition, increasing intermediate protective layer 1 and/or intermediate instruction due in this case
Layer 2, makes the thickness of liner become thicker accordingly, allows for overcritical equipment in this way with longer service life.
It should be noted that the liner of overcritical equipment is not limited only to above two specific structure, and no matter liner selects
Any structure is selected, all at least has the effect of extending overcritical service life of equipment, more preferably, additionally it is possible to make staff
Solve corrosion condition of the liner in the differential responses stage of overcritical equipment.
In actual use due to overcritical equipment, super to face for the different supercritical reactions that its inside is carried out
Boundary's equipment can select the liner of unlike material accordingly, so that the liner of overcritical equipment can have stronger corrosion resistance；
Therefore, the material of the liner of overcritical equipment can have a variety of possibility.When selecting shell of the chrome-molybdenum steel as overcritical equipment,
The welding coefficient that intermediate protective layer in liner is selected between chrome-molybdenum steel can reach 80% Inconel625 alloy, will in
Between the material of marker be selected as 12Cr2Mo1V alloy, and 12Cr2Mo1V alloy belongs to Mayari, in room temperature and high temperature
There is down preferable mechanical performance, the material of anti-corrosion layer is selected as Inconel625 alloy, and Inconel625 alloy has
Stronger inorganic acid resistance corrosive nature can judge Fe, Mo, V tri- according to all elements included in 12Cr2Mo1V alloy
Kind element can dissolve out in the medium contained inside overcritical equipment, so that in the medium contained inside overcritical equipment
The content of characteristic element changes；Therefore, when using 12Cr2Mo1V alloy as intermediate marker 2, feature can be determined
Element is Fe, Mo, V.In addition, both containing Mo from the point of view of the elemental constituent of 12Cr2Mo1V alloy and Inconel625 alloy
Element, Mo are very important alloying elements in refractory steel, can significantly improve the thermostrength of steel, keep enough at high temperature
Intensity, and crystal grain can be refined, prevent the overheat of steel to be inclined to.
When the material of intermediate marker is selected as C-276 (Hastelloy), C-276 has in the environment of supercritical reaction
Stronger corrosion resistance, and have to wet chlorine, various oxidisability chlorides, chlorination salting liquid, sulfuric acid and oxidisability salt etc.
There is good corrosion resisting property, when the material of anti-corrosion layer is selected as Inconel625 alloy, due to not containing in Inconel625
W, and contain only minimal amount of Co, can judging characteristic element be W and Co.
Referring to Fig. 2, the embodiment of the invention also provides the corrosion monitoring process of above-mentioned overcritical equipment, for monitoring
State the corrosion condition of the liner of overcritical equipment, overcritical equipment corrosion monitoring process the following steps are included:
Step 101, element contained in the element species according to contained in intermediate marker 2 and anti-corrosion layer 3
Type determines that the characteristic element to be monitored, the characteristic element are that super face can be dissolved out when intermediate marker 2 is corroded
The element in medium contained inside boundary's equipment；Specifically, in actual use due to overcritical equipment, liner
Material can have a variety of possibility；During the actual monitoring to overcritical equipment, the intermediate marker 2 in clear liner is needed
Contained in element species and anti-corrosion layer 3 contained in element species according to these element species find out centre
At least one characteristic element in the presence of marker 2, and in the medium that is contained inside overcritical equipment of characteristic element
The variation of content is able to reflect the extent of corrosion of liner.
Step 102, the content of characteristic element in the medium contained inside overcritical equipment is monitored；In more detail, with
Continuing to increase for extent of corrosion, when intermediate marker 2 is corroded, characteristic element in intermediate marker 2 can be constantly molten
Out into the medium contained inside overcritical equipment, so that characteristic element in the medium contained inside overcritical equipment
Content changes, and staff can take out the medium in overcritical equipment from the device, and carries out characteristic element to it
The detection of cellulose content, to realize that the content to characteristic element in the medium contained inside overcritical equipment is monitored；Certainly,
The method for monitoring characteristic element in the medium contained inside overcritical equipment is not limited only to this.
Step 103, liner is judged according to the variation of the content of characteristic element in the medium contained inside overcritical equipment
Extent of corrosion；Further, it is contained inside the overcritical equipment by selected characteristic element in overcritical equipment
The amount of dissolution in the medium of load is able to reflect out the extent of corrosion of liner；Therefore, the knot monitored in 102 through the above steps
Fruit, it will be able to the extent of corrosion of the liner of the overcritical equipment of accurate judgement.
In overcritical equipment corrosion monitoring process provided in this embodiment, pass through what is contained inside the overcritical equipment of monitoring
The situation of change of the content of characteristic element in medium, it will be able to accurately judge the corrosion condition of the liner of overcritical equipment.
It should be noted that contained a plurality of types of media inside above-mentioned overcritical equipment, including supercritical water,
Since supercritical water itself contains only protium and oxygen element, the monitoring of characteristic element will not be impacted, and monitored
Supercritical water only need to be taken out detection by Cheng Zhong from overcritical equipment, simple to operate, it is preferred, therefore, that selection is super
Critical judges the extent of corrosion of liner as the medium to be monitored, and according to the content of characteristic element in supercritical water.
In addition, in above-mentioned steps 103, when the content of characteristic element in the medium contained according to overcritical equipment inside
Judge that anti-corrosion layer 3 is corroded when failing, staff can stop the use of overcritical equipment, to prevent by a corruption
The problem of overcritical equipment caused by erosion is revealed suddenly in use.
Since there may be various features elements in intermediate marker 2, during actual monitoring, staff is in order to save
Monitoring time is saved, monitoring efficiency is improved, one of or two kinds of characteristic elements can generally be selected to carry out actual monitoring；And it is selecting
When the characteristic element to be monitored, it is also necessary to consider to be contained inside the element species in anti-corrosion layer 3 and overcritical equipment
Medium type, in the case where these comprehensive factors, staff can just determine the final characteristic element to be monitored；
It below for different situations, provides in step 101, two kinds of specific methods of determination of characteristic element.
First way, when characteristic element include the first element, and in anti-corrosion layer and overcritical equipment inside contained
When medium of load itself does not contain the first element, determine the first element for the characteristic element to be monitored；Due to anti-corrosion layer 3
In and overcritical equipment inside the medium itself that is contained without containing the first element, this allows for institute inside overcritical equipment
The changes of contents of the first element in the medium contained is only related to the extent of corrosion of intermediate marker 2, i.e., in intermediate marker 2
When not being corroded also, without containing the first element in the medium that overcritical equipment inside is contained, the first element is merely able to derive from
Intermediate marker 2, so in step 103, it will be able to be contained in the medium contained inside overcritical equipment as long as determining
First element just illustrates that anti-corrosion layer 3 has been corroded failure, and intermediate marker 2 has been corroded.
Further, in order to keep the result of judgement more accurate, in step 103, when detecting overcritical equipment
When the content of the first element reaches the detection limit of used monitoring device in the medium that inside is contained, anti-corrosion layer 3 is judged
Failure, and stop the use of overcritical equipment.Since monitoring device itself has detection limit, the i.e. feature that is monitored of monitoring device
The concrete content of element should be greater than detection limit as far as possible, such monitoring device can more accurate monitoring feature element content.
The second way determines the when characteristic element includes second element, and when also including second element in anti-corrosion layer
Was Used is the characteristic element to be monitored.In different environments due to overcritical equipment, the material of the liner inside is not
Together, thus cannot be guaranteed each time used in liner, element contained by intermediate marker 2 and super faces anti-corrosion layer 3
The medium itself contained inside boundary equipment does not contain, in this way when selecting characteristic element, it is necessary to according to the actual situation into
Row considers that changes of contents should be able to accurately react in the medium that selected characteristic element is contained inside overcritical equipment
The corrosion condition of liner out, without being affected by other factors.
It should be noted that be not limited only to monitor a kind of characteristic element during the actual monitoring to characteristic element, and
It, can also be more steady by the concentration of the biggish characteristic element of changes of contents amplitude and changes of contents and when monitoring various features element
The concentration of fixed characteristic element is compared, and the extent of corrosion of the liner of overcritical equipment is judged according to obtained ratio；Certainly, no
It is only limitted to this method according to ratio in judgement extent of corrosion, as long as the method that can be accurately judged to liner corrosion condition is equal
It can use.In addition, when monitoring second element, the type of second element is not limited only in order to keep monitoring result more accurate
One kind can monitor a variety of second elements simultaneously, the extent of corrosion of the liner of overcritical equipment is measured further according to monitoring result.
In the liner of above-mentioned overcritical equipment, auxiliary separation layer is equipped between apparatus casing and intermediate protective layer 1,
And/or auxiliary separation layer is equipped between intermediate protective layer 1 and intermediate marker 2, and/or, in intermediate marker 2 and corrosion resistant
It loses equipped with auxiliary separation layer between layer 3, and assisting separation layer includes that at least one layer of intermediate protective layer 1 and/or at least one layer are intermediate
When marker 3, liner can be made a variety of different structures occur, and be directed to the liner of different structure, it is super used by corresponding
Marginal devices corrosion monitoring process can have some difference；Since in the inside of intermediate marker 2, there may be intermediate protective layers
1, this, which allows for the element species in intermediate protective layer 1, also can generate certain influence to the selection of characteristic element, in this way in step
In rapid 101, it is necessary to according to element species contained in element species contained in intermediate protective layer 1, intermediate marker 2
And element species contained in anti-corrosion layer 3 can guarantee selected in this way to determine the characteristic element to be monitored
Characteristic element can accurately reflect the corrosion of liner and ask condition.
For the specific implementation of clearer description overcritical equipment corrosion monitoring process provided in an embodiment of the present invention
Preferred embodiment is given below in journey:
Embodiment one:
The material of the apparatus casing of overcritical equipment is 12Cr2Mo1V, and the material of intermediate protective layer 1 is Inconel625 conjunction
Gold, the material of intermediate marker 2 are 12Cr2Mo1V, and the material of anti-corrosion layer 3 is Inconel625 alloy.Specifically,
12Cr2Mo1V belongs to Mayari, has preferable mechanical performance, main alloying element under room temperature and hot environment
There are molybdenum, chromium, vanadium, silicon and boron etc.；Inconel625 belongs to nickel-base alloy, has outstanding anti-inorganic acid corrosive power, main
Ingredient has Ni, Cr, Mo, Fe, Nb.
According to the element separately included in 12Cr2Mo1V and Inconel625 alloy, the characteristic element of 12Cr2Mo1V is obtained
Predominantly Fe, Mo, V；And in these three characteristic elements, it can determine that Fe and Mo equally contain in Inconel625 alloy,
And V is not contained in Inconel625 alloy；Therefore, a kind of element V can be chosen as the characteristic element to be monitored, or choosing
Take Fe and Mo together as the characteristic element to be monitored.
When selecting V and to participate in when not containing V in the medium of supercritical reaction as the characteristic element to be monitored, with
The operation of overcritical equipment, anti-corrosion layer 3 in the liner of overcritical equipment can due to by general corrosion or spot corrosion and by
Corrosion failure, anti-corrosion layer 3 are corroded after failure, and the supercritical water in overcritical equipment is directly contacted with intermediate marker 2, and
Intermediate marker 2 is corroded, during corrosion, the V in 12Cr2Mo1V can be dissolved into supercritical water, so that
There is V element in supercritical water without containing V in this；In this way during being monitored to supercritical water, if monitoring excess of export
It containing V is that the anti-corrosion layer 3 that can determine whether in liner has been corroded failure in critical, staff can stop overcritical setting
Standby operation, to prevent, there is a phenomenon where the overcritical equipment caused by by spot corrosion or general corrosion to reveal suddenly.More preferably,
If the content of V has exceeded the detection limit of monitoring device in supercritical water in monitoring process, then determines that anti-corrosion layer 3 is corroded mistake
Effect, intermediate marker 2 have occurred that corrosion.
When selecting Fe and Mo as the characteristic element to be monitored, both elements can be detected in supercritical water
Content, it is contemplated that in supercritical water Ni comparision contents stablize, in order to more easily judge the corruption of liner according to monitoring result
Situation is lost, Fe and Mo can be detected respectively respectively with the concentration ratio of Ni, the liner of overcritical equipment is judged further according to ratio
Extent of corrosion.
It can be verified according to experiment, as Mo/Ni < 8 and Fe/Ni < 7 or when V element concentration is more than 0.05mg/L,
It is the optimal conditions that parking maintenance is carried out to equipment.
To the Rule of judgment for meeting Mo/Ni < 8 and Fe/Ni < 7 and meet between the Rule of judgment of V > 0.05mg/L below
Correlation verified.
Select the overall thickness of the liner of overcritical equipment for 5mm, wherein anti-corrosion layer 3 with a thickness of 2.5mm, centre refers to
Show layer 2 with a thickness of 1.5mm, intermediate protective layer 1 with a thickness of 1mm.500 are set by the environmental condition for carrying out supercritical reaction
DEG C, containing sulfate, phosphate, hydrochloride environment, and the alarm limit of V is set as 0.05mg/L (when the concentration for detecting V is more than
When 0.05mg/L, stop test), the ion concentration of Fe, Mo, Ni in supercritical water are detected, and converting is concentration ratio.
Total testing time is divided into 5 stages, it is different according to the concentration for the various ions chosen in overcritical equipment, respectively
Carry out following three groups of tests:
Test one: NaCl concentration 2.0g/L, Na2SO4 concentration 2.0g/L, Na3PO4 concentration 2.0g/L, pH=4 are chosen.Work as V
Concentration be more than alarm limit when, stop test.
| 500h | 1000h | 1500h | 2000h | 2321h | |
| Fe(mg/L) | 0.235 | 0.276 | 0.193 | 0.155 | 0.114 |
| Mo(mg/L) | 0.412 | 0.377 | 0.256 | 0.195 | 0.128 |
| V(mg/L) | 0.007 | 0.003 | < 0.001 | < 0.001 | 0.055 |
| Ni(mg/L) | 0.015 | 0.018 | 0.014 | 0.021 | 0.017 |
| Fe/Ni | 15.67 | 15.33 | 13.79 | 7.38 | 6.71 |
| Mo/Ni | 27.47 | 20.94 | 18.29 | 9.29 | 7.53 |
Table 1
After test, more uniform in the extent of corrosion of different location with defectoscope discovery liner, the most thin position of liner is thick
Degree is 1.2mm, and with a thickness of 2.7mm, examination has accurately been judged in this test before intermediate 2 eating thrown of marker for the most thick position of liner
Test dwell time.It is shown according to the data in table 1, in 2321h, the concentration of V reaches 0.055mg/L, Fe/Ni=6.71 and Mo/
Ni=7.53 demonstrates the correlation of the alarm limit and Mo/Ni, Fe/Ni ratio of V.
Test two: NaCl concentration 2.0g/L, Na2SO4 concentration 2.0g/L, Na3PO4 concentration 2.0g/L, pH=1 are chosen.When
V concentration be more than alarm limit when, stop test.
| 500h | 1000h | 1136h | |
| Fe(mg/L) | 10.228 | 6.859 | 6.103 |
| Mo(mg/L) | 15.377 | 8.912 | 8.37 |
| V(mg/L) | 0.001 | < 0.001 | 0.051 |
| Ni(mg/L) | 0.976 | 1.128 | 1.125 |
| Fe/Ni | 10.48 | 6.08 | 5.42 |
| Mo/Ni | 15.76 | 8.21 | 7.44 |
Table 2
After test, obvious in the extent of corrosion gap of different location with defectoscope discovery liner, the most thin position of liner is thick
Degree is 0.9mm, and the most thick position of liner is with a thickness of 3.6mm, this phenomenon is obvious spot corrosion, and this test has just occurred in corrosion
Risk has accurately been judged when intermediate protective layer 1, and stopped test in time.It is shown according to the data in table 2, in 1136h
When V concentration reach 0.051mg/L, Fe/Ni=5.42 and Mo/Ni=7.44, demonstrate V alarm limit and Mo/Ni, Fe/Ni
The correlation of ratio.
Based on the test result of above-mentioned test one and test two, it can be found that as Mo/Ni < 8 and Fe/Ni < 7
Judge that anti-corrosion layer 3 fails.In order to verify this conclusion, one group of V is chosen below and is less than alarming line but meets Mo/Ni < 8 and Fe/
The test data of 7 condition of Ni < is analyzed.
Test three: NaCl concentration 4.0g/L, Na2SO4 concentration 4.0g/L, Na3PO4 concentration 4.0g/L, pH=4 are chosen.
| 500h | 1000h | 1500h | 1766h | |
| Fe(mg/L) | 0.834 | 0.772 | 0.495 | 0.408 |
| Mo(mg/L) | 1.209 | 1.047 | 0.618 | 0.592 |
| V(mg/L) | 0.002 | 0.003 | < 0.001 | < 0.001 |
| Ni(mg/L) | 0.062 | 0.067 | 0.053 | 0.081 |
| Fe/Ni | 13.45 | 11.52 | 9.34 | 5.04 |
| Mo/Ni | 19.50 | 15.63 | 11.66 | 7.31 |
Table 3
After test, with the most thin position of defectoscope discovery liner with a thickness of 1.3mm, the most thick position of liner with a thickness of
3.1mm.This test has accurately judged test dwell time before intermediate marker 2 is corroded and fails.According to the number in table 3
According to display, in 1766h, the concentration of V is less than 0.001, and Fe/Ni=5.04 and Mo/Ni=7.31 at this time, demonstrates and works as Mo/Ni
< 8 and when Fe/Ni < 7, that is, can determine whether that anti-corrosion layer 3 fails.
In the description of above embodiment, particular features, structures, materials, or characteristics can be at any one or more
It can be combined in any suitable manner in a embodiment or example.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of overcritical equipment characterized by comprising apparatus casing and the liner being located inside the apparatus casing；
Wherein,
The liner successively includes intermediate protective layer, intermediate marker and anti-corrosion layer, the intermediate marker from outside to inside
In at least contain a kind of characteristic element, the characteristic element be can be dissolved out when the intermediate marker is corroded it is described super
The element in medium contained inside marginal devices, the characteristic element according to the element contained in the intermediate marker,
The type of the element contained in the anti-corrosion layer and the medium contained inside the overcritical equipment determines.
2. overcritical equipment according to claim 1, which is characterized in that
Auxiliary separation layer is equipped between the apparatus casing and the intermediate protective layer；
And/or auxiliary separation layer is equipped between the intermediate protective layer and the intermediate marker；
And/or auxiliary separation layer is equipped between the intermediate marker and the anti-corrosion layer, the auxiliary separation layer includes
At least one layer of intermediate protective layer and/or at least one layer of intermediate marker.
3. overcritical equipment according to claim 1 or 2, which is characterized in that when the material of the intermediate marker is
12Cr2Mo1V alloy, when the material of the anti-corrosion layer is Inconel625 alloy, the characteristic element is Fe, Mo and V；
When the material of the intermediate marker is C-276 alloy, and the material of the anti-corrosion layer is Inconel625 alloy, institute
Stating characteristic element is W and Co.
4. a kind of overcritical equipment corrosion monitoring process, which is characterized in that for monitoring overcritical equipment described in claim 1
Liner corrosion condition, the overcritical equipment corrosion monitoring process the following steps are included:
Step 101, member contained in the element species according to contained in the intermediate marker and the anti-corrosion layer
Plain type determines that the characteristic element to be monitored, the characteristic element are that can dissolve out when the intermediate marker is corroded
The element in medium contained inside to the overcritical equipment；
Step 102, the content of characteristic element described in the medium contained inside the overcritical equipment is monitored；
Step 103, the variation judgement of the content of the characteristic element according to the medium contained inside the overcritical equipment
The extent of corrosion of the liner.
5. overcritical equipment corrosion monitoring process according to claim 4, which is characterized in that in the step 103, when
Judge that the anti-corrosion layer is rotten according to the content of characteristic element described in the medium contained inside the overcritical equipment
When erosion failure, stop the use of the overcritical equipment.
6. overcritical equipment corrosion monitoring process according to claim 4 or 5, which is characterized in that when the characteristic element
Including the first element, and the medium itself contained in the anti-corrosion layer and inside the overcritical equipment is without
When stating the first element, in the step 101, determine first element for the characteristic element to be monitored；
In the step 103, contain first element when detecting in the medium contained inside the overcritical equipment
When, judge that the anti-corrosion layer is corroded failure.
7. overcritical equipment corrosion monitoring process according to claim 6, which is characterized in that in the step 103, when
The content for detecting the first element described in the medium contained inside the overcritical equipment reaches used monitoring device
Detection limit when, judge that the anti-corrosion layer is corroded failure.
8. overcritical equipment corrosion monitoring process according to claim 4 or 5, which is characterized in that when the characteristic element
Including second element, and when also including the second element in the anti-corrosion layer, in the step 101, described the is determined
Was Used is the characteristic element to be monitored.
9. overcritical equipment corrosion monitoring process according to claim 8, which is characterized in that in the characteristic element at least
Including two kinds of second elements.
10. overcritical equipment corrosion monitoring process according to claim 4, which is characterized in that
And/or auxiliary separation layer is equipped between the intermediate marker and the anti-corrosion layer, the auxiliary separation layer includes
At least one layer of intermediate protective layer and/or at least one layer of intermediate marker；
When the inside of the intermediate marker is equipped with the intermediate protective layer, in the step 101, according to the intermediate guarantor
It is element species contained in sheath, contained in element species and the anti-corrosion layer contained in the intermediate marker
Some element species determine the characteristic element to be monitored.
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| CN114574849B (en) * | 2021-12-16 | 2022-12-09 | 西安交通大学 | Method for improving corrosion resistance of Inconel625 alloy in oxygen-containing supercritical water |
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