CN205347576U - Prevent that naphthenic acid corrodes thermocouple sleeve pipe - Google Patents
Prevent that naphthenic acid corrodes thermocouple sleeve pipe Download PDFInfo
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- CN205347576U CN205347576U CN201520905966.XU CN201520905966U CN205347576U CN 205347576 U CN205347576 U CN 205347576U CN 201520905966 U CN201520905966 U CN 201520905966U CN 205347576 U CN205347576 U CN 205347576U
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- thermocouple
- protecting film
- flange
- sleeve pipe
- naphthenic acid
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Abstract
The utility model discloses a prevent that naphthenic acid corrodes thermocouple sleeve pipe, including sleeve pipe body, flange, outer tube, interior sleeve pipe, cutting ferrule pressure cap and thermocouple pillar, the thermocouple pillar passes through the cutting ferrule and presses cap and flange fixed connection, sleeve pipe body, flange, outer tube, interior sleeve pipe the chromic oxide(Cr_2O_3) protection film sets up between stainless steel alloy layer and molybdenum chromium carbide protection film, molybdenum chromium carbide protection film sets up the outside at the chromic oxide(Cr_2O_3) protection film. The utility model discloses mo element and cr elementary form carbide protection film to can reduce cr element carbonization thing and appear, avoid the production in the poor cr district of alloy, improve the resistant intercrystalline corrosion performance of stainless steel, the mo element is the effectual high temperature hardening agent element of one in the alloy, and most mo element all in solid solution, can make matrix material intensified, improves the ability of anti creep stress with the anti broken failure stress of steel.
Description
Technical field
This utility model belongs to chemical industry equipment technical field of anticorrosion, is specifically related to a kind of anti-naphthenic acid corrosion Thermal couple casing pipe.
Background technology
The processing capacity of domestic high acid value crude oil with poor quality also increases year by year, and owing to the price of high acid value crude oil with poor quality is more much lower than high-quality crude, therefore refining high acid value crude oil with poor quality has become petroleum chemical enterprise and reduced oil refining cost, the important channel increased economic efficiency.Domestic and international large-scale Petrochemical Enterprises also all actively attempts building the special refinery refining high-acid crude oil, progressively accumulates the experience of processing highly acidic value crude oil with poor quality, and on international raw oil market, the demand of crude oil with high acid value also will be gradually increased.Meanwhile, while the processing of high acid value crude oil with poor quality, the organic acid as high acid values such as aphthenic acids can severe corrosion equipment and pipeline.
Aphthenic acids is non-electrolytic solution, and the corrosion reaction occurred with metal is mainly chemical reaction process.Naphthenic acid corrosion major part all occurs in the liquid phase, if not having lime set and entrainment in the gas phase, then gaseous corrosion is only small.Aphthenic acids and ferrum react and generate oil-soluble ferrous naphthenate, and it can be taken away by oil stream, and departs from metal surface.Even if hydrogen sulfide and ferrum react formation Iron sulfuret. protecting film, without stoping metal and aphthenic acids to react, causing metal surface to continue exposed in corrosive environment, naphthenic acid corrosion may continue to carry out；The hydrogen sulfide simultaneously existed in medium can aggravate metal naphthenic acid corrosion; but metal and sulfur corrosion product Iron sulfuret. but can not be dissolved in medium; but form protecting film and cover metal surface; so sulfur-bearing can stop base metal to continue naphthenic acid corrosion in medium; and hydrogen sulfide can continue to generate aphthenic acids and Iron sulfuret. precipitation with ferrous naphthenate circular response; corrosion product Iron sulfuret. can adhere on the metal surface; form protecting film on the metal surface, it is possible to slow down the corrosion of aphthenic acids further.Can be seen that aphthenic acids circular regeneration in formula, so to obtain stable metal protective film, the sulfur contained in crude oil must reach corresponding index.
Consider from naphthenic acid corrosion kinetics angle, the corrosion reaction of aphthenic acids and material is typically passed through Four processes, and namely naphthenic acid molecule spreads to metal surface in the solution, naphthenic acid molecule is adsorbed on the metal surface, the active center of naphthenic acid molecule and metal surface is reacted, the corrosion product that produces is from four steps such as metal surface desorptions.Four steps can affect naphthenic acid corrosion speed, and the slowest step is just able to control the step of whole naphthenic acid corrosion reaction.As when concentration of medium is relatively big or media flow is very fast, diffusion phase is for just less the impact of other step.Owing to naphthenic acid content is different with equipment material, the difference of the factor such as medium temperature and media flow situation, the rate-determining steps of naphthenic acid corrosion reaction is not changeless.
Utility model content
The purpose of this utility model is in that to provide a kind of anti-naphthenic acid corrosion Thermal couple casing pipe, with the problem solving to propose in above-mentioned background technology.
For achieving the above object, this utility model provides following technical scheme: a kind of anti-naphthenic acid corrosion Thermal couple casing pipe, including sleeve body, flange, trocar sheath, inner sleeve, cutting ferrule pressure cap and thermocouple pillar, described flange is located at one end of sleeve body, described trocar sheath and inner sleeve are all connected with flange welding, and described trocar sheath is arranged on the outside of inner sleeve, described thermocouple pillar is connected by cutting ferrule pressure cap and flange are fixing, described sleeve body, flange, trocar sheath, inner sleeve, cutting ferrule pressure cap and thermocouple pillar are all laid with stainless steel alloy layer, chromic oxide protecting film and molybdenum chromium carbide protecting film, described chromic oxide protecting film is arranged between stainless steel alloy layer and molybdenum chromium carbide protecting film, described molybdenum chromium carbide protecting film is arranged on the outside of chromic oxide protecting film.
Preferably, it is provided with corrosion-resistant sealing ring between described cutting ferrule pressure cap and thermocouple pillar.
Preferably, described chromic oxide protecting film is sputtered on the surface of stainless steel alloy layer by magnetron sputtering method.
Technique effect of the present utility model and advantage: this anti-naphthenic acid corrosion Thermal couple casing pipe, alloying element is the key of the anti-naphthenic acid corrosion performance improving Thermal couple casing pipe, Cr element is stainless main alloy element, it is thermodynamic instability or the element of easily passivation, transpassivation phenomenon can be produced, it is possible on the material surface of Thermal couple casing pipe, form one layer of Cr2O3Protecting film, after in oxygen-containing medium, this film is destroyed, will repair rapidly, automatically along with containing the Cr raising measured, the corrosion resistance of steel also improves rapidly, and therefore corrosion resistance is played an important role by Cr；This utility model is having Cr element at stainless steel alloy layer surface sputtering, Cr element joins after inside steel alloy, stainless metallographic structure is become two-phase from single-phase, adding Cr element also can make the ferrite content in stainless steel layer increase, the microhardness of material increases, this inherently improves the antiscour corrosive nature of material, additionally, the effect in the anticorrosive property protecting film on Thermal couple casing pipe surface of the Mo element is also very notable, it not only can effectively strengthen the hardness of skin covering of the surface, reduce the active site on surface, improve material protective film pitting corrosion resistant performance in acid medium, therefore, rustless steel increases the content of Mo element, its anti-naphthenic acid corrosion performance can be significantly improved；This utility model Mo element and Cr element form carbide protecting film; and Cr element carbide can be reduced precipitate out; avoid the generation of alloy Cr-depleted region; improve rustless steel intergranular corrosion resistance performance; Mo element is an effective High-Temperature Strengthening agent element in the alloy; major part Mo element is all in solid solution, it is possible to make matrix material be strengthened, and improves the creep resistant stress of steel and the ability of the disconnected stress of resistance to fracture；This utility model wants to obtain good anti-aphthenic acids erosion corrosion performance, and the Mo constituent content in steel alloy is preferably kept in 5% (mass fraction).
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model；
Fig. 2 is sectional view of the present utility model；
Fig. 3 is sectional view of the present utility model.
In figure: 1 sleeve body, 2 flanges, 3 trocar sheaths, 4 inner sleeves, 5 cutting ferrule pressure caps, 6 thermocouple pillars, 7 stainless steel alloy layers, 8 chromic oxide protecting film, 9 molybdenum chromium carbide protecting film.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection.
This utility model provides the anti-naphthenic acid corrosion Thermal couple casing pipe of one as Figure 1-3, including sleeve body 1, flange 2, trocar sheath 3, inner sleeve 4, cutting ferrule pressure cap 5 and thermocouple pillar 6, described flange 2 is located at one end of sleeve body 1, described trocar sheath 3 and inner sleeve 4 are all welded to connect with flange 2, and described trocar sheath 3 is arranged on the outside of inner sleeve 4, described thermocouple pillar 6 is connected by cutting ferrule pressure cap 5 is fixing with flange 2, it is provided with corrosion-resistant sealing ring between described cutting ferrule pressure cap 5 and thermocouple pillar 6, described sleeve body 1, flange 2, trocar sheath 3, inner sleeve 4, cutting ferrule pressure cap 5 and thermocouple pillar 6 are all laid with stainless steel alloy layer 7, chromic oxide protecting film 8 and molybdenum chromium carbide protecting film 9, described chromic oxide protecting film 8 is arranged between stainless steel alloy layer 7 and molybdenum chromium carbide protecting film 9, described chromic oxide protecting film 8 sputters on the surface of stainless steel alloy layer 7 by magnetron sputtering method, described molybdenum chromium carbide protecting film 9 is arranged on the outside of chromic oxide protecting film 8, described molybdenum chromium carbide protecting film 9 adopts the mode of sputtering plate molybdenum and wait noble metal, then at certain temperature (300 DEG C-400 DEG C) and atmosphere (N2Or H2, 5.0L/min) under carry out alloy carbide, make noble metal sputter at the surface of chromic oxide protecting film 8.
Structural principle: alloying element is the key of the anti-naphthenic acid corrosion performance improving Thermal couple casing pipe, Cr element is stainless main alloy element, it is thermodynamic instability or the element of easily passivation, transpassivation phenomenon can be produced, it is possible on the material surface of Thermal couple casing pipe, form one layer of Cr2O3Protecting film, after in oxygen-containing medium, this film is destroyed, will repair rapidly, automatically along with containing the Cr raising measured, the corrosion resistance of steel also improves rapidly, and therefore corrosion resistance is played an important role by Cr；This utility model is having Cr element at stainless steel alloy layer 7 surface sputtering, Cr element joins after inside steel alloy, stainless metallographic structure is become two-phase from single-phase, adding Cr element also can make the ferrite content in stainless steel layer increase, the microhardness of material increases, this inherently improves the antiscour corrosive nature of material, additionally, the effect in the anticorrosive property protecting film on Thermal couple casing pipe surface of the Mo element is also very notable, it not only can effectively strengthen the hardness of skin covering of the surface, reduce the active site on surface, improve material protective film pitting corrosion resistant performance in acid medium, therefore, rustless steel increases the content of Mo element, its anti-naphthenic acid corrosion performance can be significantly improved；This utility model Mo element and Cr element form molybdenum chromium carbide protecting film 9; and Cr element carbide can be reduced precipitate out; avoid the generation of alloy Cr-depleted region; improve rustless steel intergranular corrosion resistance performance; Mo element is an effective High-Temperature Strengthening agent element in the alloy; major part Mo element is all in solid solution, it is possible to make matrix material be strengthened, and improves the creep resistant stress of steel and the ability of the disconnected stress of resistance to fracture；This utility model wants to obtain good anti-aphthenic acids erosion corrosion performance, and the Mo constituent content in steel alloy is preferably kept in 5% (mass fraction).
Last it is noted that the foregoing is only preferred embodiment of the present utility model; it is not limited to this utility model; although this utility model being described in detail with reference to previous embodiment; for a person skilled in the art; technical scheme described in foregoing embodiments still can be modified by it; or wherein portion of techniques feature is carried out equivalent replacement; all within spirit of the present utility model and principle; any amendment of being made, equivalent replacement, improvement etc., should be included within protection domain of the present utility model.
Claims (3)
1. an anti-naphthenic acid corrosion Thermal couple casing pipe, including sleeve body (1), flange (2), trocar sheath (3), inner sleeve (4), cutting ferrule pressure cap (5) and thermocouple pillar (6), it is characterized in that: described flange (2) is located at one end of sleeve body (1), described trocar sheath (3) and inner sleeve (4) are all welded to connect with flange (2), and described trocar sheath (3) is arranged on the outside of inner sleeve (4), described thermocouple pillar (6) is connected by cutting ferrule pressure cap (5) and flange (2) are fixing, described sleeve body (1), flange (2), trocar sheath (3), inner sleeve (4), cutting ferrule pressure cap (5) and thermocouple pillar (6) are all laid with stainless steel alloy layer (7), chromic oxide protecting film (8) and molybdenum chromium carbide protecting film (9), described chromic oxide protecting film (8) is arranged between stainless steel alloy layer (7) and molybdenum chromium carbide protecting film (9), described molybdenum chromium carbide protecting film (9) is arranged on the outside of chromic oxide protecting film (8).
2. the anti-naphthenic acid corrosion Thermal couple casing pipe of one according to claim 1, it is characterised in that: it is provided with corrosion-resistant sealing ring between described cutting ferrule pressure cap (5) and thermocouple pillar (6).
3. the anti-naphthenic acid corrosion Thermal couple casing pipe of one according to claim 1, it is characterised in that: described chromic oxide protecting film (8) is sputtered on the surface of stainless steel alloy layer (7) by magnetron sputtering method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520905966.XU CN205347576U (en) | 2015-11-12 | 2015-11-12 | Prevent that naphthenic acid corrodes thermocouple sleeve pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520905966.XU CN205347576U (en) | 2015-11-12 | 2015-11-12 | Prevent that naphthenic acid corrodes thermocouple sleeve pipe |
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| CN205347576U true CN205347576U (en) | 2016-06-29 |
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| CN201520905966.XU Expired - Fee Related CN205347576U (en) | 2015-11-12 | 2015-11-12 | Prevent that naphthenic acid corrodes thermocouple sleeve pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398525A (en) * | 2019-08-28 | 2019-11-01 | 中国原子能科学研究院 | ZrO2The method for sealing of base oxygen sensing element and metal flange |
-
2015
- 2015-11-12 CN CN201520905966.XU patent/CN205347576U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110398525A (en) * | 2019-08-28 | 2019-11-01 | 中国原子能科学研究院 | ZrO2The method for sealing of base oxygen sensing element and metal flange |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160629 Termination date: 20161112 |
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| CF01 | Termination of patent right due to non-payment of annual fee |