CN105675810A - System and method for monitoring high-temperature corrosive atmosphere of water cooling wall of boiler - Google Patents

System and method for monitoring high-temperature corrosive atmosphere of water cooling wall of boiler Download PDF

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Publication number
CN105675810A
CN105675810A CN201610031662.4A CN201610031662A CN105675810A CN 105675810 A CN105675810 A CN 105675810A CN 201610031662 A CN201610031662 A CN 201610031662A CN 105675810 A CN105675810 A CN 105675810A
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flue gas
gas
dilution
level
compression
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CN105675810B (en
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韦红旗
何长征
石伟伟
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INNER MONGOLIA POWERBEIJING KANGBASHI THERMOELECTRICITY Co.,Ltd.
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NANJING BOWO TECHNOLOGY DEVELOPMENT Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004Gaseous mixtures, e.g. polluted air

Abstract

The invention discloses a system and a method for monitoring high-temperature corrosive atmosphere of a water cooling wall of a boiler.The system for monitoring the high-temperature corrosive atmosphere of the water cooling wall of the boiler comprises a primary flue gas dilution sampling unit, a secondary flue gas dilution sampling unit, a diluted flue gas analyzing unit, a system reverse blowing unit and a compressed air unit.The system and the method for monitoring the high-temperature corrosive atmosphere of the water cooling wall of the boiler have the advantages that components of flue gas can be monitored at the normal temperature, all valves are arranged on compressed air pipelines, accordingly, influence of high temperatures and dust can be ingeniously prevented, long-term continuous and reliable running of the system can be guaranteed, the system and the method have cost merits, and the running safety and economic efficiency of the boiler of a power station can be obviously improved.

Description

A kind of monitoring method of boiler water-cooling wall high-temperature corrosion atmosphere monitoring system and high-temperature corrosion atmosphere
Technical field
The present invention relates to the monitoring method of a kind of boiler water-cooling wall high-temperature corrosion atmosphere monitoring system and high-temperature corrosion atmosphere, belong to Utility Boiler Technology field.
Background technology
In recent years, along with boiler is to Large Copacity, high parameter development, boiler water wall temperature improves accordingly, causes that water wall high temperature corrosion problem is got over serious; In order to reduce the growing amount of NOx, power plant adopts air stage feeding or low oxygen combustion mostly at present, water-cooling wall near zone is caused to be easily formed reducing atmosphere, and then cause the high temperature corrosion of water-cooling wall, water-cooling wall is thinned to and to a certain degree will result in 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 sulfate type and sulfide type two kinds, and the former is multiple is born in superheater and reheater, and the latter is multiple is born in furnace wall cooling. The main cause of sulfide type high temperature corrosion be coal dust under anoxic conditions burn generation H2S and free state sulfur [S], its with tube wall ferrous metal and iron oxides react and form the sulfide of ferrum, further corrosion boiler water wall and make oxide-film loosen simultaneously, breakaway even comes off.
Certain research shows, when there is reducing atmosphere near furnace wall cooling, the sulfur in fire coal is with H2The ratio that the form of S gas discharges is more than 75%; As CO/ (CO+CO2) when being risen to 24% by 8%, H2S gas concentration is then risen to 0.07% by 0.02%, thus causing the strong corrosion of water-cooling wall.
Substantial amounts of operating analysis finds, the furnace wall cooling of all seriously corrodeds, all finds reducing atmosphere and dense H in the smoke components of corresponding corrosion area2S gas. H2S gas has osmosis, and it can pass through loose Fe2O3, with finer and close magnetic iron oxide Fe3O4In FeO reaction generate FeS. After FeO protecting film destroys, H2S gas can also react with tube wall Fe and generate FeS and H2. Due to corrosion product FeS and FeO short texture porous, it is impossible to stop the intrusion of corrosive medium, washing away along with burner hearth flue dust simultaneously so that corrosion constantly develops to parent metal, corrosion ecto-entad develops gradually. Near-wall oxidizing atmosphere and reducing atmosphere are alternately present, and the corrosion product of generation is oxidized to the oxide of ferrum again, and it can continue again to react with corrosive medium, and corrosion is aggravation constantly.
From the mechanism of water wall high temperature corrosion it can be seen that reducing atmosphere is the essential condition that high temperature corrosion occurs. therefore, water-cooling wall easily occurs that the region of high temperature corrosion carry out reducing atmosphere monitoring, contributes to operations staff and pinpoint the problems in time and solved by firing optimization. but flue-gas temperature is significantly high near boiler water wall, containing a large amount of dust, and need to measure multiple spot, adopt conventional smoke sampling to analyze system and be difficult to ensure that continuously reliable monitoring. conventional smoke sampling analyzes system such as Chinese patent CN200810195414.9 disclosure, which disclose a kind of high temperature corrosion on-line monitoring system for boiler water-cooled wall, including sampling system and controlling of sampling and process system, described sampling system includes flue gas sampling inserting tube, it is followed by being provided with the flue gas sampling probe incubation chamber of attemperating unit at flue gas sampling inserting tube, it is connected to electric tracing tube after probe incubation chamber, flash cooler, it is divided into two branch roads afterwards, wherein a road is gas bypass, another road is sequentially connected with sample gas and cuts off electromagnetic valve, sample gas sampling pump, demarcate/sampling three-way magnetic valve, 0.1 μm of ceramic filter, sample gas metering pin valve and effusion meter and flue gas analysis instrument, described controlling of sampling and process system include: can control the PLC that sampling system is run, the data acquisition unit connected by data wire with flue gas analysis instrument, the industrial computer being connected by data wire with data acquisition unit. said system is excessively complicated, and not only cost is very high, and whole system operational reliability is not high, and especially valve, sampling pump etc. have movable part to be highly prone to the impact of dust due to inside.
Summary of the invention
The excessively complexity that system exists is analyzed in order to solve smoke sampling in prior art, not only cost is very high, and whole system operational reliability is not high, especially valve, sampling pump etc. have movable part to be highly prone to the defect such as impact of dust due to inside, and the present invention provides the monitoring method of a kind of boiler water-cooling wall high-temperature corrosion atmosphere monitoring system and high-temperature corrosion atmosphere.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is as follows:
A kind of boiler water-cooling wall high-temperature corrosion atmosphere monitoring system, including one-level flue gas dilution sampling unit, secondary smoke dilution sampling unit, dilution flue gas analysis unit, system blowback unit and compression air element;
One-level flue gas dilution sampling unit includes two or more one-level flue gas dilution sample lines in parallel and a mixing diverter, and all of one-level flue gas dilution sample lines all converges to mixing diverter;
Secondary smoke dilution sampling unit includes the secondary smoke dilution sampling pipeline and the gas skirt that are interconnected, and secondary smoke dilution sampling pipeline is connected with mixing diverter;
Air element connects, the other end connects with mixing diverter with compression in system blowback unit one end;
One-level flue gas dilution sample lines and secondary smoke dilution sampling pipeline all connect with compression air element;
Dilution flue gas analysis unit connects with gas skirt.
Said system is suitable to the monitoring of high-temperature corrosion atmosphere and simple in construction, with low cost, and whole system operational reliability is not easily susceptible to the impact of dust.
For the ease of controlling, compression air element at least includes a compressed air reservoir and a compressed air inlet valve with compressed air reservoir outlet, and compressed air inlet valve all connects with system blowback unit, one-level flue gas dilution sample lines and secondary smoke dilution sampling pipeline. Above-mentioned compressed air inlet valve intake valve can be manual, it is also possible to is electronic or Electromagnetic Control.
In system, the upstream of all electromagnetic valves is all connected with compressed air inlet valve.
In order to improve accuracy and the reliability of monitoring, each one-level flue gas dilution sample lines all includes flue gas sampling point connected in order, dust setting chamber, one-level ejector and controls the compression air one-level industry control electromagnetic valve of one-level ejector duty;
One-level ejector includes the first ejection gas entrance, the first working gas entrance and the first mixed gas outlet, first ejection gas entrance, the first working gas entrance and the first mixed gas outlet are mutually communicated by pipeline, first ejection gas entrance meets dust setting chamber, first working gas entrance connects compression air one-level industry control electromagnetic valve, and the first mixed gas outlet converges to mixing diverter;
The upstream of all compression air one-level industry control electromagnetic valves is all connected with compressed air inlet valve.
Flue gas sampling point easily occurs the region of high temperature corrosion to be matrix arrangements at boiler water wall, and the spacing of adjacent 2 flue gas sampling points is 1~3m.
The application perforate on water-cooling wall fin, picks out flue gas sampling point.
Secondary smoke dilution sampling pipeline includes secondary jets device and compression two grades of industry control electromagnetic valves of air;
Secondary jets device includes the second ejection gas entrance, the second working gas entrance and the second mixed gas outlet, second ejection gas entrance, the second working gas entrance and the second mixed gas outlet are mutually communicated by pipeline, second ejection gas entrance connects mixing diverter, second working gas entrance connects compression two grades of industry control electromagnetic valves of air, and the second mixed gas outlet connects gas skirt;
The upstream of compression two grades of industry control electromagnetic valves of air is all connected with compressed air inlet valve.
In order to avoid the impact of dust, one-level ejector and secondary jets device are annular jet device;
For the ease of design and manufacture, one-level ejector and secondary jets device are same size.
Above-mentioned one-level ejector rate of discharge is more than secondary jets device inlet flow rate, the mixing gas of one-level ejector outlet flow to mixing diverter, under combustion chamber draft effect, major part is all through other one-level flue gas dilution sample lines adverse current to burner hearth, play certain blowback and cool down the effect of other smoke sampling point place high temperature samples tube head, it is to avoid block or burn.
In order to be further ensured that accuracy and the service life of system monitoring, system blowback unit at least includes a compression air blowback electromagnetic valve, and compression air blowback electromagnetic valve one end connects compression air element, the other end connects mixing diverter.
In order to ensure the accuracy of monitoring, dilution flue gas analysis unit includes flue gas analysis instrument connected in order, data acquisition module and data analysis and processing module, and wherein flue gas analysis instrument is connected on gas skirt. Data acquisition module and data analysis and processing module use correlation module commonly used in the art, and the application there is no improvement in module, are improved by the parts composition of whole system, it is ensured that flue gas analysis instrument long-term stability obtains Monitoring Data.
Boiler water-cooling wall high-temperature corrosion atmosphere of the present invention monitoring system, can to easily occurring multiple flue gas sampling points in high temperature corrosion region to patrol survey.
Preferably, flue gas analysis instrument is stationary gas detector, is fixed on gas skirt, and measuring probe extends the low dust concentration region of the annular between isolating cylinder and central tube, adopts diffusion way detection.
Above-mentioned stationary gas detector can show measured value on the spot and have warning function, and measured value is converted to 4~20mA signal of telecommunication, transmits to data acquisition module and data analysis and processing module.
In order to reduce cost, ensure the accuracy of Monitoring Data simultaneously, gas skirt includes conical shell, isolating cylinder, central tube and gauge mount flange, conical shell, isolating cylinder and central tube set gradually from outside to inside, annular low soot region is formed between isolating cylinder and central tube, gauge mount flange is arranged on conical shell, and the measuring probe of flue gas analysis instrument extends the low soot region of the annular between isolating cylinder and central tube; Conical shell is provided with the inlet duct of tangential access.
The method of above-mentioned boiler water-cooling wall high-temperature corrosion atmosphere monitoring system monitoring high-temperature corrosion atmosphere, after flue gas sequentially passes through one-level flue gas dilution sample lines, mixing diverter, secondary smoke dilution sampling pipeline and gas skirt, flow into dilution flue gas analysis unit and implement to measure; Compression air element connects and one-level flue gas dilution sample lines and secondary smoke dilution sampling pipeline are common to the dilution of flue gas mutually; System blowback unit is for the cleaning of system.
Some flue gas sampling points that high temperature corrosion region occurs easy on water-cooling wall are patrolled survey by said system, survey state is patrolled when being in, compression air one-level industry control electromagnetic valve is opened respectively successively, and any time ensures that only one compression air one-level industry control electromagnetic valve is opened, the sample gas gathered is from corresponding flue gas sampling point, and patrols under survey state, and compression two grades of industry control electromagnetic valves of air are opened, compressed air inlet valve is opened, and compresses air blowback closed electromagnetic valve; When being in blowback state, all compression air one-level industry control electromagnetic valves are turned off, and compression two grades of industry control electromagnetic valves of air are also switched off, and compressed air inlet valve and compression air blowback electromagnetic valve are all opened.
In order to extend the service life of system, ensure the accuracy of monitoring, it is preferable that often patrol time all flue gas sampling point of survey, whole system pipeline of blowback and equipment simultaneously.
Boiler water-cooling wall high-temperature corrosion atmosphere of the present invention monitoring system, have employed compression air to dilute high-temperature flue gas, after one-level ejector and secondary jets device, dilution ratio reaches 5:1~20:1, again successively through above-mentioned dust setting chamber, mixing diverter and gas skirt dedusting in this process, therefore the impact that above-mentioned flue gas analysis instrument is little affected by flue gas dust, without arranging the secondary filter equipment such as filter cylinder, non-maintaining; Further, since dilution ratio is higher, have passed through again longer pipeline, therefore without arranging special cooling device, can ensureing that in gas skirt, gas temperature is close to ambient temperature, thus reducing the heatproof requirement to flue gas analysis instrument. The air-tightness of pipeline, owing to adopting compression air that high-temperature gas is diluted, therefore is required also to be greatly reduced, and then ensure that system operation reliability by native system.
Boiler water-cooling wall high-temperature corrosion atmosphere of the present invention monitoring system, at least needs the atmosphere of monitoring to include O2With CO concentration; In order to improve the accuracy that corrosivity is passed judgment on, H also should be monitored2S and SO2Concentration. CO, H of native system actual measurement2S and SO2Concentration need to be scaled in former flue gas the concentration of each composition according to dilution ratio, and the basic foundation that dilution ratio is determined is: if monitoring the CO of higher concentration, then illustrate that this smoke sampling point is in reducing atmosphere, and substantial amounts of practice have shown that, the O in reducing atmosphere2Concentration is extremely low, is generally less than 0.5%, it is believed that be absent from O in former flue gas2, simultaneously according to O in air2Accounting be 20.9%, it is possible to by calculating formula 20.9/, (20.9-surveys O2Concentration) extrapolate approximate dilution ratio. When monitoring CO concentration and being relatively low, illustrate that this smoke sampling point is in oxidizing atmosphere, adopt the meansigma methods of design dilution ratio or dilution ratio, because now the judgement of high temperature corrosion situation is not affected by measurement error, namely native system if to record CO concentration relatively low, then illustrating that high temperature corrosion risk is very low, now the accuracy of actual numerical value is inessential, it is not necessary to exact value calculates corrosion rate.
It is also embodied in above by the reasonability compressing the monitoring that Dilution air flue gas carries out reducing atmosphere again: theory and practice research shows, when CO concentration in flue gas is less than 104During ppm, water-cooling wall generally will not produce high temperature corrosion; When CO concentration in flue gas is more than 104Ppm and less than 5 × 104During ppm, there is slighter high temperature corrosion phenomenon in water-cooling wall; When CO concentration in flue gas is more than 5 × 104During ppm, water wall high temperature corrosion speed is that geometry level increases. A large amount of practices are it is also shown that the CO concentration in water-cooling wall wall flue gas is often sudden change, much smaller than 10 during oxygen abundance4Ppm, and during oxygen deficiency, CO very high concentrations, often more than 105Ppm. Therefore, owing under two kinds of conditions, CO concentration has the difference on the order of magnitude, the judgement whether water-cooling wall exists High Temperature Corrosion is comparatively clear, it is not required that flue gas analyzer has very high precision, thus the determination of dilution ratio is not just had high-precision requirement yet. It is true that more than 104Flue gas, beyond the range of conventional instrument, is carried out high magnification dilution to be caving-in bash is also preferred act by the CO measurement of concetration of ppm.
It should be added that, water wall high temperature corrosion speed is accelerated to be also equipped with two marked featurees: one is H in former flue gas2S concentration is more than 300ppm, and two is H2S and SO2The ratio of concentration is more than 1. Therefore, monitor H simultaneously2S and SO2Concentration is beneficial to accurately judge high temperature corrosion speed. H in flue gas after compressed Dilution air2S and SO2Concentration all declines to a great extent, but conventional instrument remains to comparatively accurately measure. It addition, H2S and SO2The ratio of concentration by the impact of dilution ratio, is not conducive to more precisely judging high temperature corrosion situation.
Boiler water-cooling wall high-temperature corrosion atmosphere of the present invention monitoring system also has instrument check prompt facility. When being in blowback state, the gas entered in above-mentioned gas skirt is air, now O2Concentration should be 20.9%, and CO, H2S and SO2Concentration all should make zero. If it is more to deviate above-mentioned value, point out timely check meter. This accuracy facilitating deciding on measurement data and effectiveness, thus avoiding erroneous judgement.
Above-mentioned dust setting chamber, mixing diverter and gas skirt all make dust precipitate by dilatation reduction of speed, wherein gas skirt inlet duct is tangential access, principle also by cyclonic separation carries out dedusting, the adherent outlet from the gas skirt of bottom with gas of major part dust is made to discharge, thus ensureing that above-mentioned flue gas analysis instrument is operated in low dust concentration region.
Boiler water-cooling wall high-temperature corrosion atmosphere of the present invention monitoring system has automatically and manually two kinds of duties, and under auto state, native system is automatically performed and patrols survey and blowback, and under manual mode, user of service can choose some of which flue gas sampling point and singly surveys or patrol survey. When burning optimization adjusts, choose the point of the flue gas sampling corresponding to high temperature corrosion region found under automatic surveying state, carry out Adjustment Tests targetedly, thus improving work efficiency, for not monitoring the flue gas sampling point of reducing atmosphere always, can no longer sample, to shorten the time patrolling survey every time.
The NM technology of the present invention is all with reference to prior art.
Boiler water-cooling wall high-temperature corrosion atmosphere of the present invention monitoring system, achieve the monitoring of exhaust gas components under room temperature, all valves are made to be each provided on compressed air line further, the ingenious impact avoiding high temperature, dust, ensure that system continuous reliability service for a long time, and have cost advantage concurrently, it is remarkably improved safety and economy that station boiler runs.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the embodiment of the present invention 1 boiler water-cooling wall high-temperature corrosion atmosphere monitoring system.
Fig. 2 is the schematic diagram of boiler water-cooling wall high-temperature corrosion atmosphere monitored area in the embodiment of the present invention 1.
Fig. 3 is the structural representation of one-level ejector in the embodiment of the present invention 1.
Fig. 4 is the structural representation of gas skirt in the embodiment of the present invention 1.
In above-mentioned each figure, 1 is one-level ejector, 2 is mixing diverter, 3 is secondary jets device, 4 is gas skirt, 5 is oxygen analyzer, 6 is hydrogen sulfide analyzer, 7 is flue gas analyser, 8 is carbonyl analyzer, 9 is dust setting chamber, 10 is compressed air reservoir, 11 is the compression manual intake valve of air, 12 is compression air one-level industry control electromagnetic valve, 13 is compression air blowback electromagnetic valve, 14 is compression two grades of industry control electromagnetic valves of air, 20 is burnout degree centrage absolute altitude, 21 is boiler water wall, 22 is the region that high temperature corrosion easily occurs, 23 is flue gas sampling point, 31 is flue gas (ejection gas) entrance, 32 is compression air (working gas) entrance, 33 is dilution flue gas (mixing gas) outlet, 40 is gas skirt entrance, 41 is conical shell, 42 is isolating cylinder, cylinder centered by 43, 44 is gauge mount flange, 45 export for gas skirt.
Detailed description of the invention
In order to be more fully understood that the present invention, it is further elucidated with present disclosure below in conjunction with embodiment, but present disclosure is not limited solely to the following examples.
Embodiment 1
660MW ultra-supercritical coal-fired units boiler adopts the combustion system of opposed firing, it is easily generated high temperature corrosion within the scope of both walls middle part, burnout degree centrage elevation location adjacent and above 6 meters, the thinning speed of water screen tube reaches 2mm/, the safe operation of serious threat unit. According to checking situation during maintenance, delimiting both walls and the region of high temperature corrosion easily occurs, overall width is 10 meters, and total height is 12.5 meters, and both walls is symmetrical. In order to shorten connecting line, shortening simultaneously and patrol the survey cycle, every side wall installs the boiler water-cooling wall high-temperature corrosion atmosphere monitoring system of a set of present invention; Every side wall arranges 25 flue gas sampling points, horizontal-direction pitch 2 meters, vertical direction spacing 2.5 meters. The schematic diagram of native system is shown in that Fig. 1, the schematic diagram of institute monitored area are shown in Fig. 2, and the structure of core component one-level ejector and gas skirt is shown in Fig. 3 and Fig. 4.
Native system includes one-level flue gas dilution sampling unit, secondary smoke dilution sampling unit, dilution flue gas analysis unit, system blowback unit and compression air element; One-level flue gas dilution sampling unit is made up of 25 one-level flue gas dilution sample lines in parallel and a mixing diverter; Each flue gas sampling point, dust setting chamber, an one-level ejector connected in order and control the compression air one-level industry control electromagnetic valve of its duty in one-level flue gas dilution sample lines; One-level ejector the first ejection gas entrance Jun Jie dust setting chamber, the first working gas entrance all connects compression air one-level industry control electromagnetic valve, and the first mixed gas outlet all converges to same mixing diverter; Secondary smoke dilution sampling unit is made up of a secondary smoke dilution sampling pipeline and a gas skirt; Secondary smoke dilution sampling pipeline is made up of a secondary jets device and compression two grades of industry control electromagnetic valves of air; Secondary jets device the second ejection gas entrance connects mixing diverter, and the second working gas entrance connects compression two grades of industry control electromagnetic valves of air, and the second mixed gas outlet connects gas skirt; Dilution flue gas analysis unit includes flue gas analysis instrument, data acquisition module and data analysis and processing module; System blowback unit at least includes a compression air blowback electromagnetic valve, and one end connects compression air element, and the other end connects mixing diverter; Compression air element at least includes a compression manual intake valve of air of a compressed air reservoir and its outlet, and in system, the upstream of all electromagnetic valves is all connected with the compression manual intake valve of air.
Multiple flue gas sampling points in the native system region to easily there is high temperature corrosion patrol survey. When being in survey state of patrolling, above-mentioned 25 compression air one-level industry control electromagnetic valves are opened respectively successively, and any time ensures that only one is opened, and the sample gas gathered is from corresponding flue gas sampling point; Patrolling under survey state, two grades of industry control electromagnetic valves of above-mentioned compression air are opened, and compress the manual INO of air, compress air blowback closed electromagnetic valve. When being in blowback state, above-mentioned multiple compression air one-level industry control electromagnetic valves are turned off, and compression two grades of industry control electromagnetic valves of air are also switched off, and compress the manual intake valve of air and all open with compression air blowback electromagnetic valve.
The atmosphere of native system monitoring includes O2、H2S、SO2With CO concentration, according to actual measurement O2(design dilution ratio is 9:1 to concentration correction design dilution ratio, corresponding actual measurement O2Concentration should be about 19%), and then learn the concentration of each composition in former flue gas. Native system flue gas analyzer adopts stationary gas detector, when monitoring former CO concentration in flue gas more than 5 × 104During ppm, fixed carbon monoxide detector can send sound and light alarm.
Native system often patrols time 25 flue gas sampling points of survey, whole system pipeline of blowback and equipment, and automatically checks fixed O2Whether detector is shown as (20.9 ± 0.2) %, when beyond this scope, indicating instrument needs verification; Automatically check whether other stationary gas detector all makes zero simultaneously, corresponding instrument when deviation is big, also can be pointed out to need verification.
Embodiment 2
The present embodiment is similar to Example 1, institute is the difference is that being installed on the subcritical coal unit of 300MW, boiler adopts Terms of Corner Tangential Combustion, and water-cooling wall four sides wall all arranges flue gas sampling point, and the boiler water-cooling wall high-temperature corrosion atmosphere monitoring system of the two set present invention is installed at diagonal angle.

Claims (10)

1. a boiler water-cooling wall high-temperature corrosion atmosphere monitoring system, it is characterised in that: include one-level flue gas dilution sampling unit, secondary smoke dilution sampling unit, dilution flue gas analysis unit, system blowback unit and compression air element;
One-level flue gas dilution sampling unit includes two or more one-level flue gas dilution sample lines in parallel and a mixing diverter, and all of one-level flue gas dilution sample lines all converges to mixing diverter;
Secondary smoke dilution sampling unit includes the secondary smoke dilution sampling pipeline and the gas skirt that are interconnected, and secondary smoke dilution sampling pipeline is connected with mixing diverter;
Air element connects, the other end connects with mixing diverter with compression in system blowback unit one end;
One-level flue gas dilution sample lines and secondary smoke dilution sampling pipeline all connect with compression air element;
Dilution flue gas analysis unit connects with gas skirt.
2. boiler water-cooling wall high-temperature corrosion atmosphere monitoring system as claimed in claim 1, it is characterized in that: compression air element at least includes a compressed air reservoir and a compressed air inlet valve with compressed air reservoir outlet, and compressed air inlet valve all connects with system blowback unit, one-level flue gas dilution sample lines and secondary smoke dilution sampling pipeline.
3. boiler water-cooling wall high-temperature corrosion atmosphere monitoring system as claimed in claim 2, it is characterised in that: each one-level flue gas dilution sample lines all includes flue gas sampling point connected in order, dust setting chamber, one-level ejector and controls the compression air one-level industry control electromagnetic valve of one-level ejector duty;
One-level ejector includes the first ejection gas entrance, the first working gas entrance and the first mixed gas outlet, first ejection gas entrance, the first working gas entrance and the first mixed gas outlet are mutually communicated by pipeline, first ejection gas entrance meets dust setting chamber, first working gas entrance connects compression air one-level industry control electromagnetic valve, and the first mixed gas outlet converges to mixing diverter;
The upstream of all compression air one-level industry control electromagnetic valves is all connected with compressed air inlet valve.
4. boiler water-cooling wall high-temperature corrosion atmosphere monitoring system as claimed in claim 3, it is characterised in that: flue gas sampling point easily occurs the region of high temperature corrosion be matrix arrangements at boiler water wall, and the spacing of connected 2 flue gas sampling points is 1~3m.
5. boiler water-cooling wall high-temperature corrosion atmosphere monitoring system as claimed in claim 3, it is characterised in that: secondary smoke dilution sampling pipeline includes secondary jets device and compression two grades of industry control electromagnetic valves of air;
Secondary jets device includes the second ejection gas entrance, the second working gas entrance and the second mixed gas outlet, second ejection gas entrance, the second working gas entrance and the second mixed gas outlet are mutually communicated by pipeline, second ejection gas entrance connects mixing diverter, second working gas entrance connects compression two grades of industry control electromagnetic valves of air, and the second mixed gas outlet connects gas skirt;
The upstream of compression two grades of industry control electromagnetic valves of air is all connected with compressed air inlet valve.
6. boiler water-cooling wall high-temperature corrosion atmosphere monitoring system as claimed in claim 2, it is characterized in that: system blowback unit at least includes a compression air blowback electromagnetic valve, compression air blowback electromagnetic valve one end connects compression air element, the other end connects mixing diverter.
7. boiler water-cooling wall high-temperature corrosion atmosphere monitoring system as claimed in claim 2, it is characterized in that: dilution flue gas analysis unit includes flue gas analysis instrument connected in order, data acquisition module and data analysis and processing module, and wherein flue gas analysis instrument is connected on gas skirt.
8. boiler water-cooling wall high-temperature corrosion atmosphere monitoring system as claimed in claim 7, it is characterized in that: gas skirt includes conical shell, isolating cylinder, central tube and gauge mount flange, conical shell, isolating cylinder and central tube set gradually from outside to inside, annular low soot region is formed between isolating cylinder and central tube, gauge mount flange is arranged on conical shell, and the measuring probe of flue gas analysis instrument extends the low soot region of the annular between isolating cylinder and central tube; Conical shell is provided with the inlet duct of tangential access.
9. utilize the method that the boiler water-cooling wall high-temperature corrosion atmosphere described in claim 1-8 monitors system monitoring high-temperature corrosion atmosphere, it is characterized in that: after flue gas sequentially passes through one-level flue gas dilution sample lines, mixing diverter, secondary smoke dilution sampling pipeline and gas skirt, flow into dilution flue gas analysis unit and implement to measure; Compression air element connects and one-level flue gas dilution sample lines and secondary smoke dilution sampling pipeline are common to the dilution of flue gas mutually; System blowback unit is for the cleaning of system.
10. method as claimed in claim 9, it is characterized in that: patrol survey state when being in, compression air one-level industry control electromagnetic valve is opened respectively successively, and any time ensures that only one compression air one-level industry control electromagnetic valve is opened, the sample gas gathered is from corresponding flue gas sampling point, and patrols under survey state, and compression two grades of industry control electromagnetic valves of air are opened, compressed air inlet valve is opened, and compresses air blowback closed electromagnetic valve; When being in blowback state, all compression air one-level industry control electromagnetic valves are turned off, and compression two grades of industry control electromagnetic valves of air are also switched off, and compressed air inlet valve and compression air blowback electromagnetic valve are all opened.
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CN106769822A (en) * 2017-01-11 2017-05-31 东南大学 A kind of high-temperature corrosion testing system
CN107167418A (en) * 2017-05-24 2017-09-15 南京博沃科技发展有限公司 A kind of boiler water-cooling wall high-temperature corrosion on-line monitoring method and monitoring system
CN108872487A (en) * 2018-07-08 2018-11-23 江翠珍 Source of atmospheric pollution multi-pollutant online auto monitoring device
CN109407611A (en) * 2018-12-18 2019-03-01 广东省计量科学研究院(华南国家计量测试中心) The online circling measurment intelligence control system of industrial process discharge gas ingredient and method
CN110345466A (en) * 2019-07-09 2019-10-18 南京博沃科技发展有限公司 A method of water wall high temperature corrosion in furnace is alleviated by the control of full load fineness of pulverized coal
CN110410768A (en) * 2019-08-08 2019-11-05 艾俊清 Pre- high temperature corrosion resistance System and method in Process In A Tangential Firing
CN111426649A (en) * 2020-05-11 2020-07-17 国电科学技术研究院有限公司 Boiler furnace near water-cooled wall reducing atmosphere testing and combustion optimizing adjusting system
CN112648607A (en) * 2020-11-25 2021-04-13 华能国际电力股份有限公司德州电厂 Water-cooled wall local reducing atmosphere monitoring system for online CO monitoring by grid method
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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CN106769822A (en) * 2017-01-11 2017-05-31 东南大学 A kind of high-temperature corrosion testing system
CN107167418A (en) * 2017-05-24 2017-09-15 南京博沃科技发展有限公司 A kind of boiler water-cooling wall high-temperature corrosion on-line monitoring method and monitoring system
CN107167418B (en) * 2017-05-24 2020-05-01 南京博沃科技发展有限公司 Boiler water wall high-temperature corrosion on-line monitoring method and monitoring system
CN108872487A (en) * 2018-07-08 2018-11-23 江翠珍 Source of atmospheric pollution multi-pollutant online auto monitoring device
CN109407611A (en) * 2018-12-18 2019-03-01 广东省计量科学研究院(华南国家计量测试中心) The online circling measurment intelligence control system of industrial process discharge gas ingredient and method
CN110345466A (en) * 2019-07-09 2019-10-18 南京博沃科技发展有限公司 A method of water wall high temperature corrosion in furnace is alleviated by the control of full load fineness of pulverized coal
CN110410768A (en) * 2019-08-08 2019-11-05 艾俊清 Pre- high temperature corrosion resistance System and method in Process In A Tangential Firing
CN111426649A (en) * 2020-05-11 2020-07-17 国电科学技术研究院有限公司 Boiler furnace near water-cooled wall reducing atmosphere testing and combustion optimizing adjusting system
CN112648607A (en) * 2020-11-25 2021-04-13 华能国际电力股份有限公司德州电厂 Water-cooled wall local reducing atmosphere monitoring system for online CO monitoring by grid method
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
CN112834705B (en) * 2021-01-07 2021-12-17 清华大学 Pulverized coal fired boiler furnace and gas online monitoring and early warning system thereof

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