CN104456538B - Device and method for retarding high-temperature corrosion on rotational flow opposed combustion boiler water wall - Google Patents

Device and method for retarding high-temperature corrosion on rotational flow opposed combustion boiler water wall Download PDF

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Publication number
CN104456538B
CN104456538B CN201410675467.6A CN201410675467A CN104456538B CN 104456538 B CN104456538 B CN 104456538B CN 201410675467 A CN201410675467 A CN 201410675467A CN 104456538 B CN104456538 B CN 104456538B
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blower fan
water
air
freq uency
conversion supercharging
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CN104456538A (en
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姜波
王家新
刘福国
刘科
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State Grid Corp of China SGCC
Shandong Electric Power Research Institute
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State Grid Corp of China SGCC
Shandong Electric Power Research Institute
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Abstract

The invention discloses a device and a method for retarding high-temperature corrosion on a rotational flow opposed combustion boiler water wall. The device comprises a real-time wall surface atmosphere monitoring system and a wall-adhering air system, wherein the real-time wall surface atmosphere monitoring system comprises sampling points which are arranged in different positions on water wall fins of a boiler; valve groups are adopted to acquire fume at different sampling points and sequentially feed the fume into a fume analyzer; the fume analyzer is adopted to feed monitoring data into a DCS for analysis treatment; the DCS controls a wall-adhered air pressurization fan frequency converter; the air pressurization fan frequency converter controls a variable frequency pressurization fan; secondary hot air is extracted from a secondary air box through the variable frequency pressurization fan; the secondary hot air sequentially passes through the variable frequency pressurization fan and an air adjusting device and is blown to the water wall from the position between each layer of combustors and the side wall of the boiler, so that a layer of air film is formed near the surface of the water wall, the components of the fume near the surface of the water wall are maintained within a set number range through the air film, and thus the high-temperature corrosion on the rotational flow opposed combustion boiler water wall is retarded.

Description

A kind of device and method slowing down rotation flow impact burning boiler water wall high temperature corrosion
Technical field
The present invention relates to the technical field such as electric power, coal, especially one kind slow down rotation flow impact burning boiler water-cooling wall height The device and method of temperature corrosion.
Background technology
Power industry is the important leverage of socio-economic development, with the continuous expansion of economic scale, overcritical and super The application of criticality benchmark is increasing, and station boiler develops to Large Copacity high parameter, and boiler water wall temperature accordingly improves, water-cooled Wall pipe high temperature corrosion phenomenon is more serious, and the possibility of the accident such as boiler water wall booster thus causing dramatically increases, to electricity The safe operation of factory and electrical network constitutes serious threat.In the recent jumbo overcritical, ultra-supercritical boiler gone into operation Quite a few adopts rotation flow impact combustion system.With the continuous accumulation of run time, a part of boiler has begun to be occurred The sign of high temperature corrosion, have has occurred and that more serious heated surface corrosion.Hua electricity Shandong power plant of branch company 1000mw machine What group ultra-supercritical boiler, Guo electricity Shandong power plant of branch company 600mw super critical boiler were all different degrees of occurs in that high temperature corrosion Situation.Therefore, the high temperature corrosion characteristic of research rotation flow impact burning boiler is steady safely to ensureing generating set with Prevention Technique Fixed operation has important meaning.
Face-fired boiler high temperature corrosion mechanism:
Boiler water wall is sometimes referred to as " reducing atmosphere corrosion " to the corrosion of fiery side, and water-cooling wall can not possibly be sent out to the corrosion of fiery side Life is in the oxidizing atmosphere of abundant combustion zone, but occurs in the reducing atmosphere in imperfect combustion area, now without burning Carbon granule when flying to tube skin, discharge sublimed sulfur and chloride simultaneously, sulphidisation, accelerated corrosion produced to metal. When sustained combustion is bad or pulsating flame impacts furnace wall, form the corrosive environment of high temperature and fuel excess, have in the environment Beneficial to the sulfate producing sodium and phosphorus, its fusing point only has 427 DEG C.Water-cooled wall temperature is higher, and various erosions are more easily formed, and have Data shows, in the range of 300~500 DEG C, tube wall external skin temperatures often raise 50 DEG C, and the extent of corrosion of fume side will increase by 1 times.
Sulfide type high temperature corrosion is caused mainly to be caused by the pyritic sulfur in coal, its corrosion process is as follows:
(1) pyrite powder reaches near water-cooling wall with uncombusted coal dust, is heated and decomposes to give off free atom sulphur and sulfuration Ferrous iron, reaction equation is as follows:
fes2—→fes+s
There is certain density h near pipe2S and so2When it is also possible to generate free atomic sulfur, reaction equation is as follows:
2h2s+so2—→2h2o+3s
(2) in reducing atmosphere, when tube wall temperature reaches 623k, there is sulfurization, reaction in single atomic sulfur Formula is as follows:
fe+s—→fes
(3)h2S also can pass through loose fe2o3Directly with finer and close magnetic oxygenated iron layer fe3o4(fe2o3- feo) in multiple The feo effect closed, reaction equation is as follows:
feo+h2s—→fes+h2o
(4) ferrous sulfide fes slowly aoxidizes and generates the magnetic iron oxide of black, and reaction equation is as follows:
3fes+5o2—→fe3o4+3so2
It is, in general, that the factor of impact high temperature corrosion can be summarized as at 4 points: 1) contain more s element in ature of coal;2) water Cold wall temperature is higher;3) Combustion System Design is improper;4) there are reproducibility smoke components near wall.For electricity power enterprise, First three items are difficult to change in practical situations both, uniquely can work and take measures to change Section 4.
Content of the invention
The purpose of the present invention is exactly to solve the above problems, providing one kind to slow down rotation flow impact burning boiler water-cooling wall high The device and method of temperature corrosion, specifically includes wall atmosphere real-time monitoring system, adherent wind system, feedback control system.Wherein, The adherent wind system i.e. hot Secondary Air of extension in the big bellows of Secondary Air, fires from every layer after piping and freq uency conversion supercharging blower fan Between burner and side wall, position blows to water-cooling wall, and this strand of air-flow can form one layer of air film in water-cooling wall near wall, effectively destroys Produce the condition of high temperature corrosion;Wall atmosphere real-time monitoring system is that the flue gas of real-time monitoring side water wall near zone becomes Point, and Monitoring Data is constantly sent to dcs system by wifi, provide data to support for adjusting adherent air quantity;And feed back control The rotating speed of the system processed then testing result real-time adjustment freq uency conversion supercharging blower fan according to wall atmosphere, with the adherent air quantity of effective control Size, makes the smoke components (oxygen amount, co etc.) of near wall maintain safer numerical value, so can effectively slow down eddy flow pair Rush burning boiler water-cooling wall wall high temperature corrosion it is ensured that the safe and stable operation of generating set and relevant device.In order that controlling Program structure is clear and efficiently and accurately, the present invention using the co measured value of wall atmosphere as adjustment sole basis variable.
To achieve these goals, the present invention adopts the following technical scheme that
A kind of device slowing down rotation flow impact burning boiler water wall high temperature corrosion, including wall atmosphere real-time monitoring system The diverse location on water-cooling wall fin including be arranged on boiler with adherent wind system, described wall atmosphere real-time monitoring system Sampled point, described adherent wind system includes freq uency conversion supercharging blower fan and volume adjusting apparatus, and the sampled point of described diverse location passes through Respective filter is connected with valve group, and valve group is sequentially sent to flue gas analyzer by after the smoke collecting of diverse location sampled point, institute State flue gas analyzer and Monitoring Data is sent into dcs system, after dcs system is analyzed to Monitoring Data processing, increase to adherent wind Pressure fan frequency converter sends instruction, and described adherent wind booster fan frequency converter is connected with the freq uency conversion supercharging blower fan of adherent wind system, Hot Secondary Air drawn from secondary air box by freq uency conversion supercharging blower fan, and this hot Secondary Air passes sequentially through freq uency conversion supercharging blower fan and air quantity is adjusted After the regulation of device, between every layer of burner and boiler side wall of boiler, position blows to water-cooling wall, thus attached in water-cooling wall wall Closely form one layer of air film, described air film makes the smoke components of water-cooling wall near wall maintain in setting number range, thus subtracting Slow rotation flow impact burning boiler water-cooling wall wall high temperature corrosion.
Described burner is arranged in two opposites of boiler body, and even laminating is arranged, the side wall of described boiler is Refer to two opposites being not provided with burner of boiler body.
Described freq uency conversion supercharging blower fan is connected with volume adjusting apparatus, and described freq uency conversion supercharging blower fan passes through adherent wind pipeline and two Secondary bellows connect, and described electric guard board is arranged in adherent wind pipeline, the adherent wind between freq uency conversion supercharging blower fan and electric guard board Pipeline is also connected with compressed air piping, and described compressed air piping is connected with compressed air, sets in described compressed air piping It is equipped with electrically operated valve.
Described electrically operated valve is used for the air quantity controlling compressed air to enter adherent wind pipeline.
Monitoring Data is passed through wifi and Monitoring Data is sent into dcs system by described flue gas analyzer.
Described compressed air is used for introducing the secondary air temperature that cold wind is lowered into freq uency conversion supercharging blower fan, prevents secondary air temperature mistake High and damage freq uency conversion supercharging blower fan.
It is provided with adherent wind pipeline between secondary air box and freq uency conversion supercharging blower fan, one end of described adherent wind pipeline is provided with patch Spout in wall wind pipeline stove, in adherent wind pipeline stove spout be flat (size 500mm*160mm), can left and right adjusting, angle It is set to and tilts 30 degree to side wall direction, so that hot blast can be easier to reach side wall surface, play and effectively slow down high temperature corrosion Purpose.
It is provided with expansion joint between spout in freq uency conversion supercharging blower fan and adherent wind pipeline stove.Expansion joint is exactly cold in pipeline heat expansion Cushioning effect from during contracting, prevents pipe deforming or destroyed.
Adherent wind pipeline is exactly to guide adherent wind into passage in stove from the big bellows of Secondary Air.
In adherent wind pipeline stove, spout is concordant with water-cooling wall, prevents high temperature from burning.
In adherent wind pipeline stove, notch setting is between every layer of turbulent burner and side wall, level height and burner phase With positional distance side wall 1.2m.
Valve group is arranged between filter and flue gas analyzer, and one end of described valve group is provided with several smoke inlets, institute The other end stating valve group is provided with an exhanst gas outlet, and described smoke inlet is connected with respective filter, several smoke inlets It is connected with aspiration pump by each self-corresponding flue, described aspiration pump is connected with exhanst gas outlet, on each flue all It is provided with magnetic valve, the opening and closing of described magnetic valve to be controlled by computer control system.
The built-in aspiration pump of valve group, computer control system and several magnetic valves.
Magnetic valve is arranged in valve group, and the flue of each sampled point is respectively provided with a magnetic valve, by computer controls, Ensure the flue gas sample of each sampled point successively sequentially-fed to flue gas analyzer.
Described sampled point is arranged on the water-cooling wall fin of boiler, point upper, middle and lower-ranking.
The water-cooling wall fin that described sampled point is located is equipped with perforate, is all welded with stainless steel tube in described perforate.
A kind of method slowing down rotation flow impact burning boiler water wall high temperature corrosion, comprises the steps:
Step (1): aspiration pump passes through the sampled point on the water-cooling wall fin of boiler, the flue gas near collection water-cooling wall fin Sample, and described flue gas sample is sent into flue gas analyzer by filter, the flue gas data after processing is sent by flue gas analyzer Enter dcs system, dcs system, after processing, sends control instruction to adherent wind booster fan frequency converter, adherent wind is pressurized wind Machine frequency converter controls freq uency conversion supercharging blower fan work after receiving control instruction;
Step (2): freq uency conversion supercharging blower fan introduces hot Secondary Air from secondary air box, and hot Secondary Air is through volume adjusting apparatus After adjusting wind direction, between every layer of burner and boiler side wall, position blows to water-cooling wall, forms one layer of gas in water-cooling wall near wall Film, described air film makes the smoke components of water-cooling wall near wall maintain in setting number range, thus slowing down rotation flow impact combustion Burning boiler water-cooling wall wall high temperature corrosion;
Step (3): before freq uency conversion supercharging blower fan, compressed air is introduced by compressed air piping and reduce adherent wind pipeline Inner second air temperature, makes freq uency conversion supercharging blower fan run in the safe temperature range setting.
Described freq uency conversion supercharging air-blower control program:
As co < 1500ppm, freq uency conversion supercharging blower fan does not start;
Work as co > 10000ppm, freq uency conversion supercharging blower fan maintenance power frequency operation;
1000 < co < 10000ppm, freq uency conversion supercharging fan frequency conversion runs, and the corresponding situation of concrete frequency is as follows:
As co=1500ppm, freq uency conversion supercharging blower fan frequency 25hz;
As co=2000ppm, freq uency conversion supercharging blower fan frequency 30hz;
As co=4000ppm, freq uency conversion supercharging blower fan frequency 35hz;
As co=6000ppm, freq uency conversion supercharging blower fan frequency 40hz;
As co=8000ppm, freq uency conversion supercharging blower fan frequency 45hz;
As co=10000ppm, freq uency conversion supercharging blower fan frequency 50hz;
If co numerical value between each section, freq uency conversion supercharging blower fan frequency is asked for by linear difference.
Wherein, f represents according to detection of exhaust gas compositions result freq uency conversion supercharging blower fan optimum operation Frequency, f0Represent the calculating reference point of freq uency conversion supercharging fan operation frequency, co represents that each sampled point wall smoke components monitoring is flat Average, coa、cobFor the two calculating reference points that adjustment is interval.
Assume co=3500ppm, then freq uency conversion supercharging blower fan frequency is
f = f 0 + c o - co a co b - co a = 30 + 3500 - 2000 4000 - 2000 &times; 5 = 33.75 h z
If the measured value of single-point co is higher than to measure 10 times of mean value or be less than measurement mean value 10%, program Think that this data is ill data, this data is rejected from data group.
If load is less than 50% it is contemplated that ratio of combustion is more fragile, regulating system is automatically switched off, and is not involved in adjusting, but protects Card oxygen at furnace exit is not less than 3%.
Monitoring adjusting step is five minutes, completes within five minutes a flue gas analysis, and freq uency conversion supercharging blower fan frequency calculates to be adjusted Whole.
Wall atmosphere real-time monitoring system is the smoke components of real-time monitoring side water wall near zone, adherent for adjusting Air quantity provides data to support.This system includes sample point, filtrating equipment of flue gas, valve group, flue gas analyzer etc., wherein, water-cooling wall On fin, sample point bore size is φ 6.5mm, point 3 layers of arrangement, and after perforate, weld length is φ 6 stainless steel tube of 350mm.
The present invention designs a kind of valve group, the built-in aspiration pump of valve group and several magnetic valves, and valve group adopts computer program Control the open and close of magnetic valve, the flue gas making different sample points, under the power of aspiration pump, sequentially passes through filter and takes Sample flexible pipe enters flue gas analyzer, and smoke components data is drawn and pass through wifi incoming unit dcs system by analyzer one by one, control System processed feeds back to adherent wind booster fan frequency converter according to analyze data calculating Air Quantity Required size and by result, supercharging The suitable rotating speed of ventilator selection, to provide adherent air quantity accordingly, so can make wall-cooling surface repeatedly under certain unit load Relative balance is reached, this balance can make wall smoke components (oxygen amount, co) exist between smoke components and booster fan rotating speed Keep certain security clearance scope under adherent wind action, eliminate the necessary condition producing high temperature corrosion, effectively slow down height The generation of warm corrosion phenomenon.
Beneficial effects of the present invention:
1 adherent wind i.e. extension Secondary Air in secondary air box, from every layer of burner after piping and booster fan Position blows to water-cooling wall and boiler side wall between, and so adherent wind can be formed about one layer of air film in water-cooling wall, stops coal dust gas Stream washes away water-cooling wall, improves the reducing atmosphere of the adherent flue gas of seriously corroded region water-cooling wall, restrained effectively water screen tube Corrosion.
2 wherein, and the purpose that adherent wind system introduces compressed air is the wind-warm syndrome being lowered into booster fan, prevents it because of wind Temperature is too high and burn.
3 wall atmosphere real-time monitoring systems are the smoke components of real-time monitoring side water wall near zone, for adjustment patch Wall air quantity provides data to support.
Nearby flue gas relies on aspiration pump to provide power to 4 sample points, sequentially passes through filter and sampling flexible pipe enters flue gas Analyzer, smoke components data is shown and passes through wifi incoming unit dcs system, control system is according to analysis by analyzer one by one Data calculates Air Quantity Required size and result is fed back to adherent wind booster fan frequency converter, and booster fan selects suitable Rotating speed, to provide adherent air quantity accordingly, so can make smoke components and the supercharging of wall-cooling surface repeatedly under certain unit load Relative balance is reached, this balance can make wall smoke components (oxygen amount, co) under adherent wind action between rotation speed of fan Keep certain security clearance scope, eliminate the necessary condition producing high temperature corrosion, effectively slow down sending out of high temperature corrosion phenomenon Raw.
The present invention uses freq uency conversion supercharging blower fan, and this blower fan can select suitable turning according to the smoke test result in stove Speed, is conducive to energy-conservation.
Brief description
Fig. 1 (a) and Fig. 1 (b) is side water wall high temperature corrosion figure;
Fig. 2 is adherent wind system figure;
Fig. 3 is wall atmosphere real-time monitoring system figure;
Fig. 4 basis operating mode and have, each layer side wall sample point co distribution map under feedback-less adherent wind operating mode;
Fig. 5 basis operating mode and have, each layer side wall sample point o under feedback-less adherent wind operating mode2Distribution map;
Fig. 6 h2S concentration is with co change in concentration rule figure;
Fig. 7 valve group internal structure.
Wherein, 1 boiler body, 2 rotation flow impact burners, 3 adherent wind pipelines, 4 volume adjusting apparatus, 5 freq uency conversion supercharging wind Machine, 6 electrically operated valves, 7 compressed airs, 8 electric guard boards, 9 secondary air box, 10 sample points, 11 filters, 12 valve groups, 13 flue gases divide Analyzer, 14dcs system, 15 adherent wind booster fan frequency converters, 16 smoke inlets, 17 flues, 18 magnetic valves, 19 computers Control system, 20 aspiration pumps, 21 exhanst gas outlets.
Specific embodiment
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
Find during certain 1000mw unit maintenance that 18.8 meters to 45 meters scopes of both walls water-cooling wall absolute altitude have more serious height Warm corrosion phenomenon, has 109 water screen tubes through thickness measuring inspection thinning exceeded.In maintenance, all of exceeded pipeline section is changed (rule Lattice: φ 38.1 × 7.5;Material: sa-213t2).Through analysis, in water-cooled wall dirt, contain a large amount of fe3o4With a small amount of feo and fe2o3, the sulfur content in corrosion product is higher.As shown in Fig. 1 (a) and Fig. 1 (b).
As shown in Fig. 2 Fig. 2 is adherent wind system, boiler body 1 includes four faces, two of which opposite is provided with Rotation flow impact burner 2, the opposite being provided with rotation flow impact burner 2 is respectively equipped with adherent wind pipeline 3, described adherent wind Pipeline 3 is connected with volume adjusting apparatus 4, and described volume adjusting apparatus 4 are connected with freq uency conversion supercharging blower fan 5, described freq uency conversion supercharging wind Machine 5 is connected with electrically operated valve 6 and electric guard board 8 respectively, and described electrically operated valve 6 is connected with compressed air 7, described electric guard board 8 It is connected with secondary air box 9.
Electrically operated valve is arranged in compressed air piping, in order to control compressed air to enter the air quantity of adherent wind pipeline.
Described electric guard board is arranged on adherent wind pipeline, position between freq uency conversion supercharging blower fan and secondary air box.
As shown in figure 3, being not provided with being respectively equipped with two opposites of rotation flow impact burner 2 and take of boiler body 1 Sampling point 10, described sample point 10 is connected with filter 11, and described filter 11 is connected with flue gas analyzer 13 by valve group 12, institute State dcs system 14 to be connected with adherent wind booster fan frequency converter 15, described adherent wind booster fan frequency converter 15 and freq uency conversion supercharging Blower fan 5 connects.
For ensureing the safe and stable operation of generating set it is necessary to take measures to reduce water wall high temperature corrosion to unit not Good impact.
Using the co measured value of near wall as the sole basis variable adjusting, concrete reason is the present invention:
1) there is extremely close relation between high temperature corrosion and reducing atmosphere.The high region h of co content2S content Height, the degree of this place corrosion is just big.Test shows, when water-cooling wall is nearby because coal powder density is too high, air capacity not occurs During reducing atmosphere, h2The content of s almost linearly increases with co content, and concrete data is as shown in Figure 6.For using part High sulphur content coal, h2S concentration is up to 0.04-0.06%.
Molecule is changed into, from normality, the energy being susceptible to required for the active state of chemical reaction and is referred to as activation energy.
Document monarch Wu Guang. the thermal analysis kinetics studies [d] of laboratory simulation boiler water-cooling wall high-temperature corrosion. Zhejiang University Master thesis, 2005. in 0.03%h2S+2%02+ 97.97%n2, 0.05%h2S+2%02+ 97,95%n2, 0.07% h2S+2%02+ 97.93%n2Under three operating modes, activation energy can be tried to achieve according to arrhenius equation and be respectively e1=1978.6j/ Mol, e2=1114.2j/mol, e3=780.4j/mol.
H is set up according to result of the test2The concentration (%) of s and the relational model of activation energy are
e = 3833.5 c h 2 s - 23.258
E represents the value (j/mol) of activation energy, and c represents h2The concentration (%) of s.
The increase activation energy that can be seen that with corrosion gas density from the result of analysis reduces, and represents that etchant gas is dense Degree is higher, and corrosion is more susceptible to, and meets the rule of metal erosion.
2) operation sequence can be made using co to simplify for unique adjustment variable, control system accuracy is high.
The adherent wind i.e. hot Secondary Air of extension in secondary air box, from every layer of burner after piping and booster fan Position blows to water-cooling wall and boiler side wall between, and so adherent wind can be formed about one layer of air film in water-cooling wall, stops coal dust gas Stream washes away water-cooling wall, improves the reducing atmosphere of the adherent flue gas of seriously corroded region water-cooling wall, restrained effectively water screen tube Corrosion.
Verification experimental verification
For verifying the action effect to wall-cooling surface smoke components for the method, choose certain 1000mw unit and carry out test survey Examination.This unit boiler is ultra supercritical parameter variable-pressure operation Once-through Boiler, single burner hearth, single reheat, balanced draft, dry ash extraction, All steel framework, full overhung construction, opposed firing mode, boiler adopts half outdoor, п type arrangement.Using opposed firing burning side Formula, each point 3 layers of 48 low nox turbulent burners are arranged on front-back wall, be provided with burnt wind on main burner top and side burns Wind.Test mainly obtains the smoke components data near each layer burner, and about every layer of burner, side wall opens 5 sample points, Absolute altitude is identical with each layer burner.During test, unit load stabilizes to 1050mw.Before test unit should satisfy the requirements as follows:
1. confirm that each main and auxiliary function of boiler runs well and meets test requirements document;
2. confirm cigarette, wind and the boiler circuit No leakage of boiler controller system;
3. confirm all cleannes all keeping before starting to test during normal operation of boiler controller system, carry out before test comprehensively Soot blowing;
4. before validation test machine set system with other non-test isolation of systems;
5. check and run instrument, including the verification certificate reexamining instrument, confirm all test recording apparatus Install near six months and verified;
6., during testing, the meter such as combustion chamber draft table and oxygen meter can put into and indicate correct;
7. to use coal basicly stable for boiler;
8. keep stablizing of each parameter of boiler, load fluctuation ± 3%ecr during testing, steam temperature fluctuation is less than+5-10 as far as possible DEG C, main Steam Pressure Fluctuation is less than ± 2%;
9. it is adjusted to operating condition of test, do not carry out pulverized coal preparation system switching, do not carry out the adjustment of blast, air quantity;
10. during testing, oily combustion-supporting, not soot blowing, not blowdown do not thrown by boiler, does not carry out affecting the stable adjustment of boiler.
Fig. 4, Fig. 5 be based on operating mode, adherent wind feedback-less operating mode and adherent wind feedback operating mode under each layer side wall sample point Co and o2Distribution map.Wherein, adherent wind feedback-less operating mode does not put into operation for booster fan, rely on pressure fan power output by heat two Secondary wind sends into the operating mode in stove;Adherent wind feedback operating mode puts into operation for booster fan, jointly makees with booster fan in pressure fan With the lower operating mode sent into hot Secondary Air in stove, this operating mode booster fan rotating speed reality with the change of water-cooling wall wall smoke components When adjustment.In figure broken line represents basic operating mode, adherent wind feedback-less operating mode, adherent wind feedback operating mode from bottom to top respectively;a、b、c Represent the mean value of wall three row's sample point test results from bottom to top on the left of boiler, d, e, f represent boiler right-side wall from top to bottom The mean value of three row's sample point test results.In figure can be seen that the unlatching (adherent wind feedback-less operating mode) with adherent wind, respectively Layer side wall sample point co content is decreased obviously, corresponding each layer o2Content also has obvious rising, and smoke components occur relatively Big change.And the unlatching with booster fan, can be according to the rotating speed of wall smoke components data real-time adjustment booster fan, wall Face co, o2Content has on the basis of feedback-less operating mode again significantly to be improved.Wherein, the change of co volume content is especially bright Aobvious, the co volume content contrasting this operating mode with other two operating modes is reduced to below 1500ppm, and the reducing atmosphere of wall flue gas is big The big condition improved, effectively break ring generation high temperature corrosion.Result of the test shows, the method can effectively slow down rotation flow impact combustion The high temperature corrosion of cold wall of heating up water, serves positive role for the safe and stable operation ensureing generating set.
As shown in fig. 7, valve group 12 is arranged between filter 11 and flue gas analyzer 13, one end of described valve group 12 is provided with Several smoke inlets 16, the other end of described valve group 12 is provided with an exhanst gas outlet 21, described smoke inlet 16 with respective Filter 11 connects, and several smoke inlets 16 are connected with aspiration pump 20 by each self-corresponding flue 17, described pumping Pump 20 is connected with exhanst gas outlet 21, each flue 17 is equipped with magnetic valve 18, the opening and closing of described magnetic valve 18 is by meter Calculation machine control system 19 is controlling.Valve group 12 to control the open and close of magnetic valve 18 (same using computer control system Time only one of which magnetic valve open, remaining closed electromagnetic valve), the flue gas making different sample points under the power of aspiration pump, from Valve group smoke inlet 16 arrives exhanst gas outlet 21, subsequently into flue gas analyzer.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not model is protected to the present invention The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art are not Need to pay the various modifications that creative work can make or deformation still within protection scope of the present invention.

Claims (10)

1. a kind of device slowing down rotation flow impact burning boiler water wall high temperature corrosion, is characterized in that, real-time including wall atmosphere Monitoring system and adherent wind system, on the water-cooling wall fin that described wall atmosphere real-time monitoring system includes be arranged on boiler not With the sampled point of position, described adherent wind system includes freq uency conversion supercharging blower fan and volume adjusting apparatus, the adopting of described diverse location Sampling point is connected with valve group by respective filter, and valve group is divided being sequentially sent to flue gas after the smoke collecting of diverse location sampled point Analyzer, Monitoring Data is sent into dcs system by described flue gas analyzer, after dcs system is analyzed to Monitoring Data processing, to patch Wall wind booster fan frequency converter sends instruction, the freq uency conversion supercharging blower fan of described adherent wind booster fan frequency converter and adherent wind system Connect, hot Secondary Air drawn from secondary air box by freq uency conversion supercharging blower fan, and this hot Secondary Air passes sequentially through freq uency conversion supercharging blower fan and wind After the regulation of quantity regulating device, between every layer of burner and boiler side wall of boiler, position blows to water-cooling wall, thus in water-cooling wall Near wall forms one layer of air film, and described air film makes the smoke components of water-cooling wall near wall maintain in setting number range, Thus slowing down rotation flow impact burning boiler water-cooling wall wall high temperature corrosion.
2. a kind of device slowing down rotation flow impact burning boiler water wall high temperature corrosion as claimed in claim 1, is characterized in that,
Described freq uency conversion supercharging blower fan is connected with volume adjusting apparatus, and described freq uency conversion supercharging blower fan passes through adherent wind pipeline and Secondary Air Case connects, and electric guard board is arranged in adherent wind pipeline, the adherent wind pipeline between freq uency conversion supercharging blower fan and electric guard board also with Compressed air piping connects, and described compressed air piping is connected with compressed air, is provided with electronic in described compressed air piping Valve;Described electrically operated valve is used for the air quantity controlling compressed air to enter adherent wind pipeline;Described flue gas analyzer will monitor number According to by wifi, Monitoring Data is sent into dcs system.
3. a kind of device slowing down rotation flow impact burning boiler water wall high temperature corrosion as claimed in claim 2, is characterized in that, Described compressed air is used for introducing the secondary air temperature that cold wind is lowered into freq uency conversion supercharging blower fan, prevents secondary air temperature too high and damages Freq uency conversion supercharging blower fan.
4. a kind of device slowing down rotation flow impact burning boiler water wall high temperature corrosion as claimed in claim 1, is characterized in that, It is provided with adherent wind pipeline between secondary air box and freq uency conversion supercharging blower fan, one end of described adherent wind pipeline is provided with adherent wind pipeline Spout in stove, in adherent wind pipeline stove spout be flat, can left and right adjusting, angle be set to side wall direction tilt 30 degree, with Enable hot blast to be easier to reach side wall surface, play the purpose slowing down high temperature corrosion.
5. a kind of device slowing down rotation flow impact burning boiler water wall high temperature corrosion as claimed in claim 4, is characterized in that, It is provided with expansion joint between spout in freq uency conversion supercharging blower fan and adherent wind pipeline stove.
6. a kind of device slowing down rotation flow impact burning boiler water wall high temperature corrosion as claimed in claim 1, is characterized in that, Valve group is arranged between filter and flue gas analyzer, and one end of described valve group is provided with several smoke inlets, described valve group The other end is provided with an exhanst gas outlet, and described smoke inlet is connected with respective filter, and several smoke inlets pass through each Corresponding flue is connected with aspiration pump, and described aspiration pump is connected with exhanst gas outlet, and each flue is equipped with electromagnetism Valve, the opening and closing of described magnetic valve to be controlled by computer control system.
7. a kind of device slowing down rotation flow impact burning boiler water wall high temperature corrosion as claimed in claim 1, is characterized in that, Described sampled point is arranged on the water-cooling wall fin of boiler, point upper, middle and lower-ranking.
8. a kind of device slowing down rotation flow impact burning boiler water wall high temperature corrosion as claimed in claim 1, is characterized in that, The water-cooling wall fin that described sampled point is located is equipped with perforate, is all welded with stainless steel tube in described perforate.
9. a kind of method slowing down rotation flow impact burning boiler water wall high temperature corrosion, is characterized in that, comprise the steps:
Step (1): aspiration pump passes through the sampled point on the water-cooling wall fin of boiler, the flue gas sample near collection water-cooling wall fin This, and described flue gas sample is sent into flue gas analyzer by filter, the flue gas data after processing is sent into by flue gas analyzer Dcs system, dcs system, after processing, sends control instruction to adherent wind booster fan frequency converter, and adherent wind booster fan becomes Frequency device controls freq uency conversion supercharging blower fan work after receiving control instruction;
Step (2): freq uency conversion supercharging blower fan introduces hot Secondary Air from secondary air box, hot Secondary Air is adjusted through volume adjusting apparatus After wind direction, between every layer of burner and boiler side wall, position blows to water-cooling wall, forms one layer of air film in water-cooling wall near wall, Described air film makes the smoke components of water-cooling wall near wall maintain in setting number range, thus slowing down rotation flow impact burning pot Stove water-cooling wall wall high temperature corrosion;
Step (3): before freq uency conversion supercharging blower fan, compressed air is introduced by compressed air piping and reduce by two in adherent wind pipeline Secondary wind-warm syndrome, makes freq uency conversion supercharging blower fan run at a temperature of setting.
10. a kind of method slowing down rotation flow impact burning boiler water wall high temperature corrosion as claimed in claim 9, its feature It is, described freq uency conversion supercharging air-blower control program:
As co < 1500ppm, freq uency conversion supercharging blower fan does not start;
Work as co > 10000ppm, freq uency conversion supercharging blower fan maintenance power frequency operation;
1000 < co < 10000ppm, freq uency conversion supercharging fan frequency conversion runs, and the corresponding situation of concrete frequency is as follows:
As co=1500ppm, freq uency conversion supercharging blower fan frequency 25hz;
As co=2000ppm, freq uency conversion supercharging blower fan frequency 30hz;
As co=4000ppm, freq uency conversion supercharging blower fan frequency 35hz;
As co=6000ppm, freq uency conversion supercharging blower fan frequency 40hz;
As co=8000ppm, freq uency conversion supercharging blower fan frequency 45hz;
As co=10000ppm, freq uency conversion supercharging blower fan frequency 50hz;
If co numerical value between each section, freq uency conversion supercharging blower fan frequency is asked for by linear difference;
Wherein, f represents according to detection of exhaust gas compositions result freq uency conversion supercharging blower fan optimum operation frequency, f0Represent the calculating reference point of freq uency conversion supercharging fan operation frequency, co represents each sampled point wall smoke components carbon monoxide monitoring Mean value, coa、cobFor the two calculating reference points that adjustment is interval.
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CN106123011A (en) * 2016-07-25 2016-11-16 浙江浙能技术研究院有限公司 A kind of adherent wind snout device with adjustable deflector and control method thereof
CN106287803B (en) * 2016-08-25 2018-07-13 河北思路科技有限公司 A kind of burner optimal control method and device
CN106247396B (en) * 2016-08-25 2018-11-20 河北思路科技有限公司 A kind of control system of burner optimization burning
CN107044628A (en) * 2016-10-31 2017-08-15 广东电网有限责任公司电力科学研究院 A kind of diagnostic method and device of boiler side wall water wall high temperature corrosion
CN107747731B (en) * 2017-09-21 2019-08-02 湘潭大学 A kind of adherent wind apparatus preventing boiler water-cooling wall high-temperature corrosion
CN110274221A (en) * 2019-06-25 2019-09-24 哈尔滨工业大学 A kind of boiler preventing water wall high temperature corrosion
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