CN107167418A - A kind of boiler water-cooling wall high-temperature corrosion on-line monitoring method and monitoring system - Google Patents
A kind of boiler water-cooling wall high-temperature corrosion on-line monitoring method and monitoring system Download PDFInfo
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Abstract
The invention discloses a kind of boiler water-cooling wall high-temperature corrosion on-line monitoring method and its system.Boiler water-cooling wall high-temperature corrosion on-line monitoring method, adherent flue gas is extracted at boiler water wall and uses pure air to be diluted with the high magnification not less than 10, CO, CO in dilution flue gas is measured in real time online2Concentration value CCO‑DgasAnd CCO2‑Dgas, CCO‑Dgas/CCO2‑DgasOr CCO2‑Dgas/CCO‑DgasOr CCO‑Dgas/(CCO‑Dgas+CCO2‑Dgas) or CCO2‑Dgas/(CCO‑Dgas+CCO2‑Dgas) as characteristic value, current water wall high temperature corrosion speed is characterized, foregoing multiplying power is normal volume multiplying power.The present invention can fully understand boiler water-cooling wall high-temperature corrosion situation, provide foundation for burning optimization adjustment, and then improve the security of station boiler operation, save repair and maintenance expense.
Description
Technical field
The present invention relates to a kind of boiler water-cooling wall high-temperature corrosion on-line monitoring method and monitoring system, belong to station boiler skill
Art field.
Background technology
In recent years, as boiler develops to Large Copacity, high parameter, boiler water wall temperature is accordingly improved, and causes water-cooling wall
High Temperature Corrosion more becomes serious；In order to reduce NOx growing amount, power plant uses air stage feeding or low oxygen combustion mostly at present,
Cause water-cooling wall near zone easily to form reducing atmosphere, and then cause the high temperature corrosion of water-cooling wall, water-cooling wall is thinned to necessarily
Degree will cause boiler tubes cracking accident, and the safety and economic operation of boiler controller system is constituted a serious threat.
High-temperature corrosion in boiler is broadly divided into two kinds of sulfate type and sulfide type, and the former is multiple to be born in superheater and reheating
Device, the latter is multiple to be born in furnace wall cooling.The main cause of sulfide type high temperature corrosion is that coal dust burns production under anoxic conditions
Raw H2S and free state sulphur [S], it reacts to form the sulfide of iron with tube wall ferrous metal and ferriferous oxide, further
Corrosion boiler water wall simultaneously makes loose oxide-film, breakaway or even come off simultaneously.
Certain research shows, when there is reducing atmosphere near furnace wall cooling, and the sulphur in fire coal is with H2The form of S gases
The ratio discharged is more than 75%；As CO/ (CO+CO2) when rising to 24% by 8%, H2S gas concentrations are then by 0.02%
0.07% is risen to, so as to cause the strong corrosion of water-cooling wall.
Substantial amounts of operating analysis discovery, all furnace wall cooling of all seriously corrodeds, the smoke components in corresponding corrosion area
Middle discovery reducing atmosphere and dense H2S gases.H2S gases have osmosis, and it can pass through loose Fe2O3,
With finer and close magnetic iron oxide Fe3O4In FeO reaction generation FeS.After the destruction of FeO diaphragms, H2S gases can also be with pipe
Wall Fe, which reacts, generates FeS and H2.Because corrosion product FeS and FeO short textures are porous, it is impossible to prevent invading for corrosive medium
Enter, while washing away with burner hearth flue dust so that corrosion constantly develops to parent metal, corrosion ecto-entad gradually develops.Pipe
Nearby oxidizing atmosphere is alternately present wall with reducing atmosphere, the reoxidized oxide for iron of corrosion product of generation, and it is again
It can continue to react with corrosive medium, corrosion constantly aggravation.
It was found from the mechanism of water wall high temperature corrosion, reducing atmosphere is the necessary condition for occurring high temperature corrosion.Therefore, it is right
The region that high temperature corrosion easily occurs for water-cooling wall carries out reducing atmosphere monitoring, contributes to operations staff to pinpoint the problems and pass through in time
Firing optimization is solved.But nearby flue-gas temperature is very high for boiler water wall, containing a large amount of dust, and needs to measure multiple spot, adopts
Continuous reliable monitoring is difficult to ensure that with conventional smoke sampling analysis system.Conventional smoke sampling analysis system such as Chinese patent
CN200810195414.9 disclosures, which disclose a kind of high temperature corrosion on-line monitoring system for boiler water-cooled wall, bag
Include sampling system and controlling of sampling and processing system, the sampling system includes flue gas sampling inserting tube, flue gas sampling inserting tube it
It is followed by being provided with the flue gas sampling probe incubation chamber of temperature control device, electric tracing tube, fast quickly cooling is connected with after probe incubation chamber
But device, is divided into two branch roads afterwards, wherein being all the way gas bypass, another road is sequentially connected sample gas barrier magnetic valve, sample gas and adopted
Sample pump, demarcation/sampling three-way magnetic valve, 0.1 μm of ceramic filter, sample gas metering pin valve and flowmeter and flue gas analysis instrument；
The controlling of sampling includes with processing system：The PLC of controllable sampling system operation；Pass through data wire phase with flue gas analysis instrument
The data acquisition unit connect；The industrial computer being connected with data acquisition unit by data wire.Said system is excessively complicated, not only cost
Very high, and whole system operational reliability is not high, especially valve, sampling pump etc. have movable part to be highly prone to due to inside
The influence of dust.
The content of the invention
Cost is high, reliability is low caused by excessively complicated in order to solve smoke sampling analysis system in the prior art asks
Topic, the present invention provides a kind of boiler water-cooling wall high-temperature corrosion on-line monitoring method and its system.
In order to solve the above technical problems, the technical solution adopted in the present invention is as follows：
A kind of boiler water-cooling wall high-temperature corrosion on-line monitoring method, extracts adherent flue gas and using clean at boiler water wall
Net air is diluted with the high magnification not less than 10, measures CO, CO in dilution flue gas in real time online2Concentration value CCO-DgasWith
CCO2-Dgas, CCO-Dgas/CCO2-DgasOr CCO2-Dgas/CCO-DgasOr CCO-Dgas/(CCO-Dgas+CCO2-Dgas) or CCO2-Dgas/(CCO-Dgas
+CCO2-Dgas) as characteristic value, current water wall high temperature corrosion speed is characterized, foregoing multiplying power is normal volume multiplying power.
Applicant it has been investigated that, the adherent exhaust gas components of direct measurement characterize water wall high temperature corrosion speed and are faced with height
Warm, high dust concentration etc. is difficult to the difficulty overcome, but carries out high magnification dilution to flue gas using pure air, and with CO and CO2
The relative height of concentration characterizes water wall high temperature corrosion speed, is relatively easy to realize.In theory, using without CO and CO2Gas
Body dilutes to adherent flue gas arbitrary proportion, will not change CO and CO2The relative height of concentration, the above-mentioned ratio that both arbitrarily constitute
It can reflect that the reducing atmosphere of adherent flue gas is strong and weak, so that the estimation for water wall high temperature corrosion speed provides foundation.
In order to simplify system and cost-effective, the application is diluted using pure air to adherent flue gas, but due to sky
Contain a small amount of CO in gas2, survey CO and CO in dilution flue gas2Also there is deviation in the relative height of concentration and adherent flue gas.In order to repair
Just above-mentioned deviation, the accuracy for improving monitoring, it is synchronous to measure CO in pure air in real time2Concentration value CCO2-air, for correcting dilution
CO in flue gas2Concentration value CCO2-Dgas, modification method is CO in dilution flue gas2Concentration measured value subtracts CCO2-airIt is used as CO after amendment2
Concentration value CCO2-Dgas.Above-mentioned modification method is a kind of approximate data from mathematical operation, but precision disclosure satisfy that engineering is needed
Will.
Monitor for convenience, while ensureing the accuracy of monitoring, it is preferable that adherent flue gas is using 10~100 times of normal volumes
Pure air dilution.
Boiler water-cooling wall high-temperature corrosion on-line monitoring system used in above-mentioned boiler water-cooling wall high-temperature corrosion on-line monitoring method
System, including flue gas dilution processing branch road, branch road on-off valve, dilution flue gas main pipe, pure air main pipe, CO measurement of concetrations element and
First CO2Measurement of concetration element；
Flue gas dilution processing branch road one end connects with the flue gas sampling hole on water-cooling wall, the other end and branch road on-off valve, dilute
Release flue gas main pipe sequential concatenation；Pure air main pipe is communicated with flue gas dilution processing branch road；
CO measurement of concetrations element and the first CO2Measurement of concetration element is installed in dilution flue gas main pipe, is respectively used to survey
CO concentration values C in amount dilution flue gas main pipeCO-DgasAnd CO2Concentration value CCO2-Dgas。
In order to improve the accuracy of monitoring, the 2nd CO is installed in pure air main pipe2Measurement of concetration element, measures cleaning
CO in air2Concentration value CCO2-air, for correcting CO in dilution flue gas2Concentration value CCO2-Dgas。
It is preferred that, CO measurement of concetrations element, the first CO2Measurement of concetration element and the 2nd CO2Measurement of concetration element is using infrared
E measurement technology.The design of the system is also based on existing infrared survey CO, CO2The Technical comparing of concentration is ripe, and it has
The advantages such as service life length, reliability height, degree of accuracy height.
For extension CO measurement of concetrations element and the first CO2The service life of measurement of concetration element, improve said system can
By property, flue gas dilution processing branch road includes high-temperature dust removal section, cryogenic condensation section, extraction dilution section and the dilution flue gas connected successively
Flue gas sampling hole, high-temperature dust removal section, cryogenic condensation section on transportation section, boiler water wall, extraction dilution section, dilution flue gas conveying
Section, branch road on-off valve and dilution flue gas main pipe are connected in order, and pure air main pipe is communicated with extracting dilution section.It can so obtain low
The low temperature dilution flue gas of dust, low humidity, good condition is provided for accurate reliable measurements.
Water-cooling wall is that the flue gas sampling hole on the main heated portion of boiler, water-cooling wall is used for the sample detecting of flue gas；Water
Cold wall is provided with the general knowledge that heat-insulation layer is in row.
In order to be further ensured that the accuracy of system lifetim and monitoring, high-temperature dust removal section is provided with dust setting chamber and Nai Gao
Warm filter, dust setting chamber and high-temperature resistant filter are each provided inside water-cooling wall heat-insulation layer, and the flue gas on boiler water wall is adopted
Sample hole, dust setting chamber, high-temperature resistant filter and cryogenic condensation section are connected in order.Dust setting chamber and high-temperature resistant filter are all provided with
Inside water-cooling wall heat-insulation layer, to avoid the water vapor condensation in flue gas.
It is preferred that, high-temperature resistant filter is ceramic filter.
It is preferred that, cryogenic condensation section is located at outside water-cooling wall heat-insulation layer, is directly contacted with air.
In order to be further ensured that the accuracy of system lifetim and monitoring, boiler water-cooling wall high-temperature corrosion on-line monitoring system
System, in addition to pure air delivery pipe, pure air delivery pipe one end connects with pure air main pipe, the other end and branch road break-make
Valve connects；Cryogenic condensation section includes condensed water and accumulates tank and flue gas delivery pipe, and high-temperature resistant filter and condensed water accumulate tank and connected,
Pure air inner diameter of delivery tube is more than flue gas delivery pipe external diameter, and flue gas delivery pipe one end connects with condensed water accumulation tank, the other end
Insert in pure air delivery pipe and less than the end of pure air delivery pipe；Flue gas delivery pipe end in pure air delivery pipe
Dilution section is is extracted in 5~50cm part before and after portion, and it is dilution flue gas that pure air delivery pipe, which extracts the part in dilution section downstream,
Transportation section.
The direction that downstream is swum in the application is consistent with the flow direction of gas.
Further preferably, the part of flue gas delivery pipe insertion pure air delivery pipe and the concentric cloth of pure air delivery pipe
Put and and horizontal plane.
It is preferred that, above-mentioned pure air is the compressed air by dedusting, dehumidifying.When branch road on-off valve is opened, interior pipe
Section (flue gas delivery pipe) aspirates adherent flue gas, simultaneously under section (pure air delivery pipe) compressed air jet effect of outer pipe
Diluting effect is played, and condensed water is attracted on inner circle pipeline section internal face, is flowed downward under Action of Gravity Field；When branch road on-off valve
During closing, cylindrical pipeline section compressed air reversely flows back towards burner hearth through inner circle pipeline section, on the one hand high-temperature dust removal section, the product of cryogenic condensation section
Ash and hydrops take back burner hearth, and another aspect cooled flue gas thieff hatch prevents coking and blocking at flue gas sampling hole.
Flue gas delivery pipe inserts pure air delivery pipe and less than pure air delivery pipe, namely flue gas delivery pipe one end
It is connected with condensed water accumulation tank, one end is inserted in pure air delivery pipe, the one of flue gas delivery pipe insertion pure air delivery pipe
End is less than adherent flue gas in pure air delivery pipe, flue gas delivery pipe and cooled down by the pure air in pure air delivery pipe,
Most moisture content can be removed before being mixed with pure air.
When respective branch on-off valve is opened, the moisture content extracted in adherent flue gas, flue gas is condensed in pipeline, is temporarily stored in
Condensed water accumulates in tank；Treat that present branch on-off valve is closed, above-mentioned pure air accumulates wet during tank to burner hearth adverse current, condensed water
Degree increase, so that hydrops is progressively taken back burner hearth in a gaseous form, it is to avoid cause micro- on hydrops directly punching to high-temperature resistant filter
Hole plug.
In order to improve the accuracy and convenience of control, it is preferable that branch road on-off valve is magnetic valve.
In order to realize that flue gas dilution concentration is adjustable, compressed air pressure regulating valve is installed in pure air main pipe upstream, passes through pressure
Power adjustment changes flue gas dilution multiplying power.
For the life-span of extension device, flue gas sampling hole is opened on the water-cooling wall fin for easily occurring high temperature corrosion region,
The quantity in flue gas sampling hole, flue gas dilution processing branch road and branch road on-off valve is two or more, and each flue gas sampling hole is successively
Flue gas dilution handles branch road and all the way branch road on-off valve all the way for correspondence connection.
Said system carries out patrolling survey to some flue gas sampling holes, when patrolling a certain flue gas sampling hole of survey, only opens current branch
Branch road on-off valve on road, namely other branch road on-off valves are completely in closed mode.
It is preferred that, it is in matrix arrangements, phase on the water-cooling wall fin of high temperature corrosion that flue gas sampling hole easily occurs in boiler water wall
The spacing in adjacent two flue gas sampling holes is 1~3m.
In order to improve the correlation of features described above value and high temperature corrosion speed, boiler water-cooling wall high-temperature corrosion on-line monitoring system
System, in addition to monitor supervision platform, monitor supervision platform are used to show current system working condition, and show the characteristic value in each flue gas sampling hole
Size, high temperature corrosion speed to relevant position and high temperature corrosion degree carry out automatic on-line evaluation.
High temperature corrosion on-line monitoring system for boiler water-cooled wall of the present invention has automatically and manually two kinds of working conditions, automatic shape
Under state the system be automatically performed patrol user of service under survey, manual mode can choose some of which flue gas sampling hole carry out single survey or
Patrol survey.When burning optimization is adjusted, the high temperature corrosion region found under automatic surveying state is chosen, targetedly adjustment examination is carried out
Test, so as to improve operating efficiency, the water cooling wall region for not monitoring reducing atmosphere always can no longer be sampled,
To shorten the time for patrolling survey every time.
The NM technology of the present invention is with reference to prior art.
A kind of boiler water-cooling wall high-temperature corrosion on-line monitoring method of the present invention and its system, high magnification is carried out to adherent flue gas
Dilute, after the process procedure such as removing dust, dehumidifying and extraction, CO, CO in measurement dilution flue gas2Concentration value, with CO and CO2Concentration
Relative height characterizes water wall high temperature corrosion speed, simple, reliable；Generation high temperature corrosion region easy to water-cooling wall carries out multiple spot and patrolled
Survey, fully understand boiler water-cooling wall high-temperature corrosion situation, provide foundation for burning optimization adjustment, and then improve station boiler operation
Security, save repair and maintenance expense.
Brief description of the drawings
Fig. 1 is the schematic diagram of the high temperature corrosion on-line monitoring system for boiler water-cooled wall of the embodiment of the present invention 1.
Fig. 2 is the schematic diagram in boiler water-cooling wall high-temperature corrosion on-line monitoring region in the embodiment of the present invention 1.
In above-mentioned each figure, 1 is water-cooling wall, and 2 be fin, and 3 be branch road on-off valve, and 4 be dilution flue gas main pipe, and 5 be clean empty
Gas main pipe, 6 be pressure regulator valve, and 7 be dust setting chamber, and 8 be high-temperature resistant filter, and 9 be that condensed water accumulates tank, and 10 be flue gas sampling
Hole, 11 be high-temperature dust removal section, and 12 be cryogenic condensation section, and 13 is extract dilution section, and 14 be dilution flue gas transportation section, and 15 be easily generation
High temperature corrosion region, 16 be heat-insulation layer, and 17 be burnout degree center line, and 20 be CO measurement of concetration elements, and 21 be the first CO2Concentration is surveyed
Element is measured, 22 be the 2nd CO2Measurement of concetration element.
Embodiment
For a better understanding of the present invention, with reference to the embodiment content that the present invention is furture elucidated, but the present invention
Content is not limited solely to the following examples.
Embodiment 1
A kind of boiler water-cooling wall high-temperature corrosion on-line monitoring method, extracts adherent flue gas and using clean at boiler water wall
Net air is diluted with 10~100 high magnification, measures CO, CO in dilution flue gas in real time online2Concentration value CCO-DgasAnd CCO2-Dgas,
CCO-Dgas/CCO2-DgasOr CCO2-Dgas/CCO-DgasOr CCO-Dgas/(CCO-Dgas+CCO2-Dgas) or CCO2-Dgas/(CCO-Dgas+
CCO2-Dgas) as characteristic value, current water wall high temperature corrosion speed is characterized, foregoing multiplying power is normal volume multiplying power；
It is synchronous to measure CO in pure air in real time2Concentration value CCO2-air, for correcting CO in dilution flue gas2Concentration value
CCO2-Dgas, modification method is CO in dilution flue gas2Concentration measured value subtracts CCO2-airIt is used as CO after amendment2Concentration value CCO2-Dgas。
Boiler water-cooling wall high-temperature corrosion on-line monitoring system used in above-mentioned boiler water-cooling wall high-temperature corrosion on-line monitoring method
System includes：Flue gas dilution processing branch road, branch road on-off valve, dilution flue gas main pipe, pure air main pipe, CO measurement of concetrations element,
First CO2Measurement of concetration element and the 2nd CO2Measurement of concetration element；
Flue gas dilution processing branch road one end connects with the flue gas sampling hole on water-cooling wall, the other end and branch road on-off valve, dilute
Release flue gas main pipe sequential concatenation；Pure air main pipe is communicated with flue gas dilution processing branch road；
CO measurement of concetrations element and the first CO2Measurement of concetration element is installed in dilution flue gas main pipe, is respectively used to survey
CO concentration values C in amount dilution flue gas main pipeCO-DgasAnd CO2Concentration value CCO2-Dgas；2nd CO2Measurement of concetration element is arranged on cleaning
In air main pipe, CO in pure air is measured2Concentration value CCO2-air, for correcting CO in dilution flue gas2Concentration value CCO2-Dgas；CO
Measurement of concetration element, the first CO2Measurement of concetration element and the 2nd CO2Measurement of concetration element uses infrared measurement technique.
Flue gas dilution processing branch road includes high-temperature dust removal section, cryogenic condensation section, extraction dilution section and the dilution connected successively
Flue gas sampling hole, high-temperature dust removal section, cryogenic condensation section on flue gas transportation section, boiler water wall, extraction dilution section, dilution flue gas
Transportation section, branch road on-off valve and dilution flue gas main pipe are connected in order, and pure air main pipe is communicated with extracting dilution section；
High-temperature dust removal section is provided with dust setting chamber and high-temperature resistant filter, and dust setting chamber and high-temperature resistant filter are each provided at
Inside water-cooling wall heat-insulation layer, flue gas sampling hole, dust setting chamber, high-temperature resistant filter and cryogenic condensation section on boiler water wall
It is connected in order；High-temperature resistant filter is ceramic filter；
Cryogenic condensation section is located at outside water-cooling wall heat-insulation layer, is directly contacted with air.Boiler water-cooling wall high-temperature corrosion is supervised online
Examining system, in addition to pure air delivery pipe, pure air delivery pipe one end connects with pure air main pipe, the other end and branch road
On-off valve connects；Cryogenic condensation section includes condensed water and accumulates tank and flue gas delivery pipe, and high-temperature resistant filter and condensed water accumulate tank
Connect, pure air inner diameter of delivery tube is more than flue gas delivery pipe external diameter, flue gas delivery pipe one end is accumulated tank with condensed water and connected, separately
In one end insertion pure air delivery pipe and less than the end of pure air delivery pipe；Pure air conveying inner tube smoke conveying
Dilution section is is extracted in 30cm part before and after tube end, and it is dilution flue gas that pure air delivery pipe, which extracts the part in dilution section downstream,
Transportation section；The part of flue gas delivery pipe insertion pure air delivery pipe and pure air delivery pipe arranged concentric and and horizontal plane
Vertically.
Above-mentioned branch road on-off valve is magnetic valve.Pure air main pipe upstream is equiped with compressed air pressure regulating valve, passes through pressure
Adjustment changes flue gas dilution multiplying power.
Flue gas sampling hole is opened on the water-cooling wall fin for easily occurring high temperature corrosion region, flue gas sampling hole, flue gas dilution
The quantity for handling branch road and branch road on-off valve is two or more, and each flue gas sampling hole is corresponding in turn to connection flue gas dilution all the way
Handle branch road and all the way branch road on-off valve；Flue gas sampling hole is on the water-cooling wall fin that high temperature corrosion easily occurs for boiler water wall
Matrix arrangements, the spacing in adjacent two flue gas samplings hole is 1~3m.
660MW ultra-supercritical coal-fired units boiler uses the combustion system of opposed firing, in both walls middle part, combustion
Wind center line elevation location is also easy to produce high temperature corrosion in the range of 6 meters adjacent and above to the greatest extent, and water screen tube is thinned speed and reaches 2mm/,
The safe operation of serious threat unit.According to situation is checked during maintenance, delimit both walls and easily occur the region of high temperature corrosion, always
Width is 10m, and total height is 12.5m, and both walls are symmetrical.In order to shorten connecting line, the survey cycle is patrolled while shortening, per surface side wall
A set of high temperature corrosion on-line monitoring system for boiler water-cooled wall of the invention is installed；25 flue gas sampling holes, water are put per surface side wall paper
Square to spacing 2m, vertical direction spacing 2.5m.The schematic diagram of the system is shown in Fig. 1, and the schematic diagram of institute monitored area is shown in Fig. 2.
After high temperature corrosion on-line monitoring system for boiler water-cooled wall input, CO and CO at 16 flue gas sampling holes is monitored altogether2
Concentration proportion CCO-Dgas/CCO2-DgasMore than 0.5, illustrate that respective regions reproducibility is stronger, adjusted by burning optimization, it is final to realize
CO and CO at all flue gas sampling points2Concentration proportion is less than 0.5, wherein being less than 0.2 more than 90%, so as to essentially eliminate water
Cold wall strong reducing property atmosphere zones, have reached the purpose for significantly slowing down water wall high temperature corrosion speed.
Embodiment 2
It is substantially the same manner as Example 1, except that：The subcritical coal units of 300MW are installed on, boiler is cut using corner
Circle combustion system, water-cooling wall four sides wall arranges flue gas sampling hole, and the diagonal boiler water wall high temperature for installing two sets of present invention is rotten
Lose on-line monitoring system.
Embodiment 3
It is substantially the same manner as Example 1, except that：High temperature corrosion on-line monitoring system for boiler water-cooled wall, in addition to prison
Platform is controlled, monitor supervision platform is used to show current system working condition, and shows the size of the characteristic value in each flue gas sampling hole, to phase
The high temperature corrosion speed and high temperature corrosion degree of position is answered to carry out automatic on-line evaluation.
Claims (10)
1. a kind of boiler water-cooling wall high-temperature corrosion on-line monitoring method, it is characterised in that：Adherent cigarette is extracted at boiler water wall
Gas simultaneously uses pure air to be diluted with the high magnification not less than 10, measures CO, CO in dilution flue gas in real time online2Concentration value
CCO-DgasAnd CCO2-Dgas, CCO-Dgas/CCO2-DgasOr CCO2-Dgas/CCO-DgasOr CCO-Dgas/(CCO-Dgas+CCO2-Dgas) or
CCO2-Dgas/(CCO-Dgas+CCO2-Dgas) as characteristic value, current water wall high temperature corrosion speed is characterized, foregoing multiplying power is standard body
Product multiplying power.
2. boiler water-cooling wall high-temperature corrosion on-line monitoring method as claimed in claim 1, it is characterised in that：It is synchronous to measure in real time
CO in pure air2Concentration value CCO2-air, for correcting CO in dilution flue gas2Concentration value CCO2-Dgas, modification method is dilution flue gas
Middle CO2Concentration measured value subtracts CCO2-airIt is used as CO after amendment2Concentration value CCO2-Dgas。
3. boiler water-cooling wall high-temperature corrosion on-line monitoring method as claimed in claim 1 or 2, it is characterised in that：Adherent flue gas
Using the pure air dilution of 10~100 times of normal volumes.
4. the boiler water wall used in boiler water-cooling wall high-temperature corrosion on-line monitoring method described in claim 1-3 any one
High temperature corrosion on-line monitoring system, it is characterised in that：Including flue gas dilution processing branch road, branch road on-off valve, dilution flue gas main pipe,
Pure air main pipe, CO measurement of concetrations element and the first CO2Measurement of concetration element；
Flue gas dilution processing branch road one end connects with the flue gas sampling hole on boiler water wall, the other end and branch road on-off valve, dilute
Release flue gas main pipe sequential concatenation；Pure air main pipe is communicated with flue gas dilution processing branch road；
CO measurement of concetrations element and the first CO2Measurement of concetration element is installed in dilution flue gas main pipe, is respectively used to measurement dilution
CO concentration values C in flue gas main pipeCO-DgasAnd CO2Concentration value CCO2-Dgas。
5. high temperature corrosion on-line monitoring system for boiler water-cooled wall as claimed in claim 4, it is characterised in that：It is female in pure air
The 2nd CO is installed on pipe2Measurement of concetration element, measures CO in pure air2Concentration value CCO2-air, for correcting in dilution flue gas
CO2Concentration value CCO2-Dgas。
6. the high temperature corrosion on-line monitoring system for boiler water-cooled wall as described in claim 4 or 5, it is characterised in that：Flue gas dilution
Processing branch road includes high-temperature dust removal section, cryogenic condensation section, extraction dilution section and the dilution flue gas transportation section connected successively, boiler water
Flue gas sampling hole, high-temperature dust removal section, cryogenic condensation section in cold wall, extraction dilution section, dilution flue gas transportation section, branch road on-off valve
Connected in order with dilution flue gas main pipe, pure air main pipe is communicated with extracting dilution section.
7. high temperature corrosion on-line monitoring system for boiler water-cooled wall as claimed in claim 6, it is characterised in that：High-temperature dust removal section is set
There are dust setting chamber and high-temperature resistant filter, dust setting chamber and high-temperature resistant filter are each provided inside water-cooling wall heat-insulation layer, pot
Flue gas sampling hole, dust setting chamber, high-temperature resistant filter and cryogenic condensation section on stove water-cooling wall is connected in order；Cryogenic condensation section
It is located at outside water-cooling wall heat-insulation layer, is directly contacted with air.
8. high temperature corrosion on-line monitoring system for boiler water-cooled wall as claimed in claim 7, it is characterised in that：Also include clean empty
Letter shoot, pure air delivery pipe one end connects with pure air main pipe, the other end connects with branch road on-off valve；Cryogenic condensation
Section includes condensed water and accumulates tank and flue gas delivery pipe, and high-temperature resistant filter and condensed water accumulate tank and connected, pure air delivery pipe
Internal diameter is more than flue gas delivery pipe external diameter, and flue gas delivery pipe one end connects with condensed water accumulation tank, other end insertion pure air is defeated
Send in pipe and less than the end of pure air delivery pipe；5~50cm before and after flue gas delivery pipe end in pure air delivery pipe
Dilution section is is extracted in part, and it is dilution flue gas transportation section that pure air delivery pipe, which extracts the part in dilution section downstream,.
9. the high temperature corrosion on-line monitoring system for boiler water-cooled wall as described in claim 4 or 5, it is characterised in that：Clean empty
Compressed air pressure regulating valve is installed in gas main pipe upstream, and flue gas dilution multiplying power is changed by pressure adjustment.
10. the high temperature corrosion on-line monitoring system for boiler water-cooled wall as described in claim 4 or 5, it is characterised in that：Flue gas sampling
Hole is opened on the water-cooling wall fin for easily occurring high temperature corrosion region, and flue gas sampling hole, flue gas dilution processing branch road and branch road are logical
The quantity of disconnected valve is two or more, and each flue gas sampling hole is corresponding in turn to connection, and flue gas dilution handles branch road and propped up all the way all the way
Road on-off valve；It is in matrix arrangements, adjacent two on the water-cooling wall fin of high temperature corrosion that flue gas sampling hole easily occurs in boiler water wall
The spacing in flue gas sampling hole is 1~3m；Also include monitor supervision platform, monitor supervision platform is used to show current system working condition, and shows
Show the size of the characteristic value in each flue gas sampling hole, the high temperature corrosion speed and high temperature corrosion degree to relevant position exist automatically
Line assessment.
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| CN112791880A (en) * | 2020-12-04 | 2021-05-14 | 华能国际电力股份有限公司德州电厂 | Spraying scheme design method and equipment |
| CN112834705A (en) * | 2021-01-07 | 2021-05-25 | 清华大学 | Pulverized coal fired boiler furnace and gas online monitoring and early warning system thereof |
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