CN110988275A - Method for judging high-temperature corrosion of boiler water wall through adherent gas components - Google Patents
Method for judging high-temperature corrosion of boiler water wall through adherent gas components Download PDFInfo
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- CN110988275A CN110988275A CN201911385198.9A CN201911385198A CN110988275A CN 110988275 A CN110988275 A CN 110988275A CN 201911385198 A CN201911385198 A CN 201911385198A CN 110988275 A CN110988275 A CN 110988275A
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- 230000007797 corrosion Effects 0.000 title claims abstract description 54
- 238000005260 corrosion Methods 0.000 title claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 230000001464 adherent effect Effects 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000007789 gas Substances 0.000 claims abstract description 37
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000003546 flue gas Substances 0.000 claims abstract description 15
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 238000002848 electrochemical method Methods 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000010304 firing Methods 0.000 claims description 6
- 239000000779 smoke Substances 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000002956 ash Substances 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 239000010881 fly ash Substances 0.000 claims description 2
- 238000011269 treatment regimen Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims 2
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000011156 evaluation Methods 0.000 abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 abstract description 4
- 238000004458 analytical method Methods 0.000 abstract description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 11
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 11
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 11
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 6
- 239000003245 coal Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 235000013980 iron oxide Nutrition 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910017436 S2 Can Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0044—Sulphides, e.g. H2S
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/004—CO or CO2
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
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Abstract
The invention discloses a method for judging high-temperature corrosion of a boiler water wall through adherent gas components, which comprises the following steps of: 1) small holes are formed in fins between water cooling wall pipes of the boiler to install wall-adhering atmosphere measuring points; 2) extracting the flue gas near the wall of the water-cooled wall through an adherence atmosphere measuring hole, and storing the flue gas by using a gas sampling bag; 3) according to the electrochemical method or the infrared method, the flue gas component analyzer is utilized to adhere to the wall of the water-cooled wall (mainly comprising O)2、CO、H2S) measuring; 4) and carrying out discriminant analysis according to the criterion of high-temperature corrosion of the boiler water wall. The method is simple, convenient to operate and clear in judgment standard, most of the existing thermal power generating units can be realized under the existing conditions, and effective detection and evaluation means can be provided for the regular detection of the high-temperature corrosion condition of the water-cooled wall of the coal-fired boiler.
Description
Technical Field
The invention belongs to a high-temperature corrosion prevention technology for a water-cooled wall of a coal-fired boiler, and particularly relates to a method for judging high-temperature corrosion of the water-cooled wall of the boiler through adherent gas components.
Background
High temperature corrosion occurring to coal burning boilers is generally classified into the following types: coal ash type high temperature corrosion, sulfate type high temperature corrosion, sulfide type high temperature corrosion, chloride type high temperature corrosion, hydrogen sulfide type high temperature corrosion, high temperature corrosion caused by a reducing atmosphere, and the like.
With the continuous improvement of the control requirement of discharging nitrogen oxides of domestic coal-fired boilers, most of the coal-fired boilers adopt a low-nitrogen combustion technology of deep air classification to realize low NOxAnd (5) discharging. However, under the low-nitrogen combustion condition, the water-cooled wall has very low oxygen content and very high CO concentration, the whole body is in a reducing atmosphere, and meanwhile, a large amount of corrosive gas (mainly H in the reducing atmosphere) exists at the position close to the water-cooled wall2S gas) to cause serious high-temperature corrosion of the boiler water wall, so that the tube wall of the water wall is quickly corroded and thinned and even explodes, and the operation safety of the boiler is seriously influenced. The high-temperature corrosion that occurs on the heated surface of the boiler water-cooled wall under low-nitrogen combustion conditions is therefore typically high-temperature corrosion caused by sulfide-type, hydrogen sulfide-type and reducing atmospheres.
For sulfide type high temperature corrosion, the corrosion is mainly caused by a large amount of free sulfur and sulfide (H) in the flue gas in the area near the pipe wall2S) and in a reducing atmosphere, the corrosion products of which are analyzed to be mainly composed of sulfides and iron oxides, with a lower sulfate content. Sulfide corrosion is mainly caused by FeS in coal2Activity [ S ] by pyrolysis]Cause, activity [ S ]]Diffusing along the grain boundary, penetrating through the oxide layer and reacting with the matrix to generate FeS, and oxidizing the generated FeS (3FeS + 2O)2→Fe3O4+3S), released [ S]Continuously diffusing and permeating to the interior to form sulfide again. When sulfide corrosion occurs, the temperature of the alloy is low, and the service atmosphere is mainly a reducing atmosphere. The temperature of the water-cooled wall in the main heating surface of the boiler is low, and the service environment of the boiler contains a large amount of free active sulfur atoms and H2S gas, while the low nitrogen combustion technology accelerates the generation of reducing gases.
For the high-temperature corrosion of the hydrogen sulfide type,
the hydrogen sulfide generated when the pulverized coal is combusted under the anoxic condition can corrode the metal on the pipe wall of the heating surface. Research results show that the content of CO in the flue gas is higher, the content of hydrogen sulfide gas is also higher, and the hydrogen sulfide gas can penetrate through the iron oxide to react with FeO in the collision iron oxide layer:
FeO+H2S→FeS+H2O
when the protective film is damaged, the metal substrate is exposed to a corrosive medium:
Fe+H2S→FeS+H2
S2-can exist continuously under the reducing atmosphere condition, and when the reducing atmosphere is weak in alkali, the sulfur can react with oxygen to form elemental sulfur:
2FeS+O2→2FeO+2[S]
at this time, the generated elemental sulfur can continuously corrode the metal pipe wall.
For high-temperature corrosion caused by reducing atmosphere, when pulverized coal is combusted in a boiler, in a certain area, due to the fact that the pulverized coal is too high in concentration and insufficient in oxygen content, the pulverized coal cannot be completely combusted to form a certain reducing atmosphere, the content of reducing gas can be increased, the reducing gas can damage a protective film generated on the surface of a pipe wall, CO in adherence atmosphere is a necessary condition for corrosion [97], the concentration of H2S in flue gas is in direct proportion to the concentration of CO, taking CO as an example:
3Fe2O3+CO→2Fe3O4+CO2
Fe3O4+CO→3FeO+CO2
3FeO+5CO→Fe3C+4CO2
Fe3C→3Fe+C
Fe+CO→FeO+C
meanwhile, when the protective film is reduced to be loose and porous, other corrosive media can penetrate into the oxide film, and the corrosion speed is greatly accelerated.
At present, no unified standard method exists for judging the high-temperature corrosion of the water-cooled wall of the combustion boiler in China, and the judgment, analysis and research on the commonly occurring high-temperature corrosion problem of the water-cooled wall of the boiler are not facilitated, so that the feasible and reliable method for judging the high-temperature corrosion of the water-cooled wall of the boiler is favorable for promoting the evaluation of the operation safety of the boiler.
Disclosure of Invention
The invention aims to provide a method for judging high-temperature corrosion of a boiler water-cooled wall by adherent gas components, which can accurately and reliably evaluate the risk and degree of the high-temperature corrosion of the boiler water-cooled wall so as to take effective measures to improve the safety of boiler operation.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a method for judging high-temperature corrosion of a boiler water wall through adherent gas components comprises the following steps:
(1) measured adherent gas composition of a designated area of the hearth comprising O2CO and H2S, the test method comprises the following steps:
1) small holes are formed in fins between water cooling wall pipes of the boiler to install wall-adhering atmosphere measuring points;
2) extracting the flue gas near the wall of the water-cooled wall through an adherence atmosphere measuring hole, and storing the flue gas by using a gas sampling bag;
3) measuring the wall-adhering atmosphere of the water-cooled wall by using a flue gas component analyzer according to an electrochemical method or an infrared method;
(2) and carrying out grading judgment on different degrees of high-temperature corrosion according to the criterion of the high-temperature corrosion of the water-cooled wall of the boiler.
The invention is further improved in that in the step 1), the fins between the water wall tubes are provided with the openings
The small hole, wall-attached atmosphere measuring tube adopt
The 304 seamless stainless steel tube is manufactured and penetrates through the small hole, the insertion depth of one end of the stainless steel tube extending into the inner side of the hearth is 5mm higher than the surface of the water wall tube, one end of the outer side of the hearth extends out of the heat preservation layer of the furnace wall by 150mm, and the joint of the measuring tube and the fin adopts a double-sided surfacing modeAnd connecting and sealing, wherein the heat-insulating contact end of the measuring tube and the furnace wall is sealed by adopting an aluminum silicate filler and a flat aluminum plate.
The further improvement of the invention is that 20 adherent atmosphere measuring points are arranged on each furnace wall and are arranged in 4 layers, 5 measuring points on each layer are symmetrically arranged about the central line of the furnace wall, the distances from the 5 measuring points to the front wall and the rear wall are 1/10 × a (b), 3/10 × a (b), 5/10 × a (b), 7/10 × a (b) and 9/10 × a (b), wherein a and b are the depth and the width of a hearth respectively; wherein 2 layers are arranged in the main burner area, 1 layer is arranged in the overfire air area, and 1 layer is arranged in the reduction area between the main burner and the overfire air; the boiler adopts a front wall and a rear wall opposed firing mode, wall-attached air measuring points are arranged on the boiler walls at the left side and the right side, and wall-attached air measuring points are arranged on the boiler walls at four sides for a tangential firing mode boiler with four corners.
The invention has the further improvement that in the step 2), the adherence atmosphere acquisition system comprises an air extraction heat tracing pipe, a water vapor filter, a fly ash filter, a vacuum pump and a gas sampling bag which are connected with the measuring pipe; the temperature of the air exhaust heat tracing pipe is set to be not lower than 150 ℃; and (3) extracting the water-cooled wall near-wall smoke by using a vacuum pump through the installed wall-attached atmosphere measuring point, removing water and ash, and then collecting by using a gas sampling bag.
The invention is further improved in that in the step 3), the water-cooled wall is adhered to the wall by using a flue gas component analyzer according to an electrochemical method or an infrared absorption method2、CO、H2And S, measuring, wherein each measuring point needs to extract 3 samples, and the smoke component of each measuring point is the average value of the measured values of the 3 samples.
A further development of the invention is that the adherent O is2The concentration and the CO concentration are auxiliary indexes and represent the occurrence condition of corrosive gas; adherence H2The concentration of S is a final index which represents the amount and the corrosion degree of the corrosive gas; in the step (2), the standard for judging the high-temperature corrosion of the water-cooled wall is as follows:
and analyzing the regional distribution and degree condition of the high-temperature corrosion of each furnace wall according to the adherent atmosphere test results of different test points and the judgment of the high-temperature corrosion degree of the water-cooled wall, and adopting a targeted treatment strategy.
Compared with the prior art, the invention has at least the following beneficial technical effects:
the implementation method is simple, convenient to operate and clear in judgment standard, most of the existing thermal power generating units can be realized under the existing conditions, and effective detection and evaluation means can be provided for the regular detection of the high-temperature corrosion condition of the water wall of the coal-fired boiler; secondly, the problems can be found in advance through the periodic evaluation of the high-temperature corrosion of the water-cooled wall, and the problems are solved by adopting operation adjustment or equipment transformation measures, so that the risk of boiler operation is reduced, the operation reliability of the boiler is improved, and the economic loss of power generation enterprises is avoided.
Drawings
FIG. 1 is a schematic view showing the installation of a wall-attached atmosphere measuring point of a water wall of a boiler;
FIG. 2 is a schematic diagram of arrangement of atmosphere measuring points attached to the wall of the boiler water-cooled wall.
Description of reference numerals:
1-fin, 2-water wall tube, 3-adherence atmosphere measuring tube, 4-furnace wall insulating layer, 5-filler, 6-main burner, 7-over-fire air burner and 8-adherence atmosphere measuring point.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention provides a method for judging high-temperature corrosion of a boiler water wall through adherent gas components, which comprises the following steps of:
(1) the adherent gas composition of the appointed area of the measured hearth mainly comprises O2, CO and H2S, and the test method comprises the following steps:
the fins 1 between the water cooling wall pipes 2 of the boiler are opened
The small hole of (3) is a wall-attached atmosphere measuring tube
304 seamless stainless steel tube and through the smallThe insertion depth of one end of the hole, which extends into the inner side of the hearth, is 5mm higher than the surface of the water wall tube 2, one end of the outer side of the hearth extends out of the furnace wall heat-insulating layer by 4-150 mm, the joint of the measuring tube and the fin 1 is connected and sealed by adopting a double-sided build-up welding mode, and the contact end of the measuring tube and the furnace wall heat-insulating layer is sealed by adopting an aluminum silicate filler 5 and a flat aluminum plate; each furnace wall is provided with 20 adherence atmosphere measuring points which are arranged in 4 layers, and 5 measuring points in each layer are symmetrically arranged relative to the center line of the furnace wall and are arranged at equal intervals along the depth or width direction of the hearth; wherein 2 layers are arranged in the area of the main burner 6, 1 layer is arranged in the area of the over-fire air burner 7, and 1 layer is arranged in the reduction area between the main burner 6 and the over-fire air; the front and rear wall opposed firing mode boiler is arranged, the adherence atmosphere measuring points 8 are arranged on the left and right side boiler walls, the four corners tangential firing mode boiler is arranged, and the adherence atmosphere measuring points 8 are arranged on the four side boiler walls.
(2) Through the installed wall-attached atmosphere measuring point 8, water-cooled wall near-wall smoke is extracted by a vacuum pump, and collected by a gas sampling bag after water and ash are removed; the temperature of the air-extracting heat tracing pipe is set to be not lower than 150 ℃.
(3) According to the electrochemical method or the infrared method, the flue gas component analyzer is utilized to adhere to the wall of the water cooled wall to form an atmosphere O2、CO、H2And S, measuring, wherein each measuring point needs to extract 3 samples, and the smoke component of each measuring point is the average value of the measured values of the 3 samples.
(4) To adhere to the wall O2The concentration and the CO concentration are auxiliary indexes and represent the occurrence condition of corrosive gas; adherence H2The concentration of S is the final index, which indicates the amount of the corrosive gas and the degree of corrosion. And judging the high-temperature corrosion condition near each measuring point of the boiler water wall according to the following judgment standard.
Claims (6)
1. A method for judging high-temperature corrosion of a boiler water-cooled wall through adherent gas components is characterized by comprising the following steps:
(1) measured adherent gas composition of a designated area of the hearth comprising O2CO and H2S, the test method comprises the following steps:
1) small holes are formed in fins between water cooling wall pipes of the boiler to install wall-adhering atmosphere measuring points;
2) extracting the flue gas near the wall of the water-cooled wall through an adherence atmosphere measuring hole, and storing the flue gas by using a gas sampling bag;
3) measuring the wall-adhering atmosphere of the water-cooled wall by using a flue gas component analyzer according to an electrochemical method or an infrared method;
(2) and carrying out grading judgment on different degrees of high-temperature corrosion according to the criterion of the high-temperature corrosion of the water-cooled wall of the boiler.
2. The method for distinguishing the high-temperature corrosion of the water wall of the boiler through the adherent gas components as claimed in claim 1, wherein in the step 1), the fins between the water wall tubes are provided with the holes
The small hole, wall-attached atmosphere measuring tube adopt
The 304 seamless stainless steel tube is manufactured and penetrates through the small hole, the insertion depth of one end of the stainless steel tube extending into the inner side of the hearth is 5mm larger than the surface of the water wall tube, one end of the outer side of the hearth extends out of the furnace wall heat insulation layer by 150mm, the joint of the measuring tube and the fin is connected and sealed in a double-sided surfacing mode, and the heat insulation contact end of the measuring tube and the furnace wall is sealed by aluminum silicate filler and a flat aluminum plate.
3. The method for distinguishing the high-temperature corrosion of the water-cooled wall of the boiler through the adherent gas components as claimed in claim 2, wherein 20 adherent atmosphere measuring points are arranged on each furnace wall in 4 layers, 5 measuring points on each layer are symmetrically arranged about the central line of the furnace wall, the distances from the 5 measuring points to the front wall and the rear wall are 1/10 × a (b), 3/10 × a (b), 5/10 × a (b), 7/10 × a (b) and 9/10 × a (b), wherein a and b are the depth and the width of a hearth respectively; wherein 2 layers are arranged in the main burner area, 1 layer is arranged in the overfire air area, and 1 layer is arranged in the reduction area between the main burner and the overfire air; the boiler adopts a front wall and a rear wall opposed firing mode, wall-attached air measuring points are arranged on the boiler walls at the left side and the right side, and wall-attached air measuring points are arranged on the boiler walls at four sides for a tangential firing mode boiler with four corners.
4. The method for distinguishing the high-temperature corrosion of the water-cooled wall of the boiler according to the adherent gas components of claim 1, wherein in the step 2), the adherent atmosphere collection system comprises an air-extracting heat tracing pipe, a water vapor filter, a fly ash filter, a vacuum pump and a gas sampling bag which are connected with a measuring pipe; the temperature of the air exhaust heat tracing pipe is set to be not lower than 150 ℃; and (3) extracting the water-cooled wall near-wall smoke by using a vacuum pump through the installed wall-attached atmosphere measuring point, removing water and ash, and then collecting by using a gas sampling bag.
5. The method for distinguishing the high-temperature corrosion of the water cooled wall of the boiler according to the adherent gas components of claim 1, wherein in the step 3), the adherent atmosphere O of the water cooled wall is analyzed by a flue gas component analyzer according to an electrochemical method or an infrared absorption method2、CO、H2And S, measuring, wherein each measuring point needs to extract 3 samples, and the smoke component of each measuring point is the average value of the measured values of the 3 samples.
6. The method for distinguishing the high-temperature corrosion of the water-cooled wall of the boiler by the adherent gas components as claimed in claim 1, wherein the adherent O is2The concentration and the CO concentration are auxiliary indexes and represent the occurrence condition of corrosive gas; adherence H2The concentration of S is a final index which represents the amount and the corrosion degree of the corrosive gas; in the step (2), the standard for judging the high-temperature corrosion of the water-cooled wall is as follows:
and analyzing the regional distribution and degree condition of the high-temperature corrosion of each furnace wall according to the adherent atmosphere test results of different test points and the judgment of the high-temperature corrosion degree of the water-cooled wall, and adopting a targeted treatment strategy.
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| CN201911385198.9A CN110988275A (en) | 2019-12-28 | 2019-12-28 | Method for judging high-temperature corrosion of boiler water wall through adherent gas components |
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| CN201911385198.9A CN110988275A (en) | 2019-12-28 | 2019-12-28 | Method for judging high-temperature corrosion of boiler water wall through adherent gas components |
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| CN113864813A (en) * | 2021-08-20 | 2021-12-31 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Control system, method, electronic equipment and storage medium of combustor |
| CN114353045A (en) * | 2022-01-10 | 2022-04-15 | 西安交通大学 | Method and device for preventing and treating high-temperature corrosion of boiler water-cooled wall |
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