CN101988151B - Continuous annealing furnace gas cleanliness detecting system - Google Patents
Continuous annealing furnace gas cleanliness detecting system Download PDFInfo
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- CN101988151B CN101988151B CN2010102683029A CN201010268302A CN101988151B CN 101988151 B CN101988151 B CN 101988151B CN 2010102683029 A CN2010102683029 A CN 2010102683029A CN 201010268302 A CN201010268302 A CN 201010268302A CN 101988151 B CN101988151 B CN 101988151B
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Abstract
The invention discloses a continuous annealing furnace gas cleanliness detecting system, which mainly comprises a furnace gas sampling master pipe, a gas pollutant collector branch and a metering and gas return master pipe, wherein the input end of the furnace gas sampling master pipe is communicated with the interior of an annealing furnace chamber through a pipeline, and the output end of the furnace gas sampling master pipe is connected with the input end of the gas pollutant gross collector branch through a pipeline and connected with the output end of a nitrogen blowing loop; the output end of the gas pollutant collector branch is connected with the input end of the metering and gas return master pipe through a pipeline; and the input end of the nitrogen blowing loop is communicated with a nitrogen station through a pipeline, the nitrogen blowing loop is connected in parallel on the pipelines of a gas distributor and an automatic switching valve of the furnace gas sampling master pipe through two manual switching valves connected in series with the nitrogen blowing loop, and the output end of the metering and gas return master pipe is communicated with the interior of the annealing furnace chamber through a pipeline. The system can accurately detect pollutants in the furnace in time, and provides basis for improving product quality, reasonably arranging shutdown maintenance and clearing the furnace.
Description
Technical field
The present invention relates to strip heat treatment technics field, cold rolled metal, relate in particular to a kind of continuous annealing furnace furnace gas degree of cleaning detection system, be used for medium-to-high grade automobile, household electrical appliances panel production field.
Background technology
Along with automobile, electrical appliance industry constantly increase the great surface quality product demand; Product surface quality is required more and more stricter; Continuous zinc coating and continuous annealing production line development of new techniques have been promoted; Yet owing to receive the influence of high temperature, airtight or the like factor, key issues that some restriction quality producies improve still do not break through as the continuous annealing furnace of nucleus equipment, and the detection of furnace gas degree of cleaning is exactly one of them under the continuous annealing furnace production status.Current production and technician have clearly recognized the detrimentally affect that the furnace atmosphere spatter property brings equipment in quality product and the stove; And be placed on attention and take measures to reduce in the harm; For example increased cleaning, adopt spraying resistive connection knurl furnace roller, optimize technological operation, regularly cleaned equipment or the like in the stove, these measures are played great effect to improving strip surface quality undoubtedly.But the existence owing to furnace roller dross, roll surface carbon distribution, band steel produce irregular dent, bright spot or the like defective in stove has restricted the further raising of high-quality product qualification rate.Therefore, to the detection problem of continuous annealing furnace furnace gas degree of cleaning, caused the extensive concern of cold rolled automobile sheet, tame electroplax manufacturing enterprise.
A harmful type of material (being called for short " noxious " perhaps " pollutent ") mainly is in being suspended in stove or sedimentation, covers in stove equipment and have water vapour that changes the possible solid particulate of suspended substance, silk, floss, droplet form particle, liquid-solid mixed state particle and oxygen, excess again into or the like in the stove.Wherein solid particulate mainly is derived from the band steel under furnace high-temperature and high-speed cruising state, produces small iron particle and the adhered particles come off through friction, vibration, the dust of entering outside stove etc. when also having the powder that comes off from equipment in the stove with maintenance in addition.Silk and floss mainly come from coming off of stove inside thermal conservation material and efflorescence.The droplet form particulate component is mainly drop and several kinds of mixture droplets that droplet collision forms that the mechanical means oil leak forms in drop (comprising assorted oil) that the volatilization of water vapour drop, emulsion produces, the stove.Noxious retains in stove and not only quality product is constituted a threat to and influence, and simultaneously equipment in the stove is caused damage.
Current quantity and the hazard rating that does not have this type objectionable impurities both at home and abroad proposes a kind of generally acknowledged decision method, more do not propose sophisticated detection method and device.And when producing, only can judge that this has increased the probability of operation easier and error in judgement greatly in the stove according to existing instrument indication and experience.
Summary of the invention
Technical problem to be solved by this invention is: for improving the quality of products such as medium-to-high grade automobile, household electrical appliances panel, quick, the reliable detection system of continuous annealing furnace furnace gas pollutent is provided.
The present invention solves its technical problem and adopts following technical scheme:
Continuous annealing furnace furnace gas degree of cleaning detection system provided by the invention; Mainly be responsible for and form by the furnace gas sampling person in charge, gas pollutant scoop branch road, metering and gas loopback; Wherein: said furnace gas sampling is responsible for; Its input terminus is communicated with through pipeline and lehre furnace chamber are interior, and its output terminal links to each other with the input terminus of gas pollutant total amount scoop branch road through pipeline, and links to each other with the output terminal in nitrogen purging loop; The output terminal of gas pollutant scoop branch road links to each other with the input terminus of metering with gas loopback branch road through a pipeline; The input terminus in nitrogen purging loop is communicated with the nitrogen station through pipeline; This nitrogen purging loop is through two manual switch valves of its serial connection; Be connected in parallel on the pipeline of gas distributor that furnace gas sampling is responsible for, automatic switch valve, metering and the gas loopback person in charge's output terminal is communicated with by in pipeline and the lehre furnace chamber.
Above-mentioned continuous annealing furnace furnace gas degree of cleaning detection system provided by the invention, its application that continuous annealing furnace furnace gas degree of cleaning detect in medium-to-high grade automobile or household electrical appliances panel production field.
The present invention is based on following situation files an application: because continuous annealing unit and pot galvanize unit nucleus equipment--continuous annealing furnace (being called for short " lehre "); Adopt high temperature, airtight production status, the factor that influences quality product in the stove is detected very difficulty.Although lehre has disposed the detection by quantitative of oxygen, hydrogen, dew point content, still can't reflect the changing conditions in the stove comprehensively.Particularly the content of noxious, distribution and variation are in blank at home and abroad basically to the monitoring of equipment influence in quality product and the stove in the furnace gas.If can realize the furnace gas degree of cleaning of each furnace gas different positions are taken a sample at any time, carry out qualitative and quantitative detecting analysis, to produce instructing undoubtedly, maintenance of the equipment brings benefit.
The present invention does not compare with adopting this technological continuous annealing unit, has following main beneficial effect:
1. whether possess the condition of producing great surface quality requirement product for solving operating lehre, basis for estimation more reliably is provided.
Continuous annealing furnace belongs to the long-term main equipment of closed operation continuously, and cleaning once often needs a few days and even several weeks in shutdown maintenance and the stove, general annual minimum blowing out 2-3 time.In the continuous long-term production of unit; Stove is not if when adopting this this detection technique; The situation of furnace installation operation; Only can judge whether current production status satisfies the high-quality product requirement according to the industrial camera picture (being mainly used in the supervision of band steel position) of routine, limited detect parameters and operative employee's experience.Because the influence that retains and produce of stove internal contamination thing can't detect, this has increased the probability of operation easier and error in judgement greatly, requires the production of product to constitute very big threat to great surface quality.Through in service to stove; The check and analysis of furnace gas objectionable constituent can accurately, in time detect stove internal contamination thing, and this makes operator cross quantitatively from qualitative the judgement of kiln run; Improved the level of controlling; For improving the quality of products, cause high-quality product degradation or underproof probability for reducing or stopping because of inner operating is not clear, foundation is provided.
2. rationally arrange shutdown maintenance, prepurging that reference frame is provided for equipment in the stove.
Equipment goes wrong and is difficult to monitoring usually in the stove, and the initial stage that particularly goes wrong monitoring is more difficult, in case impact, loses very greatly, can't produce high-quality product even.Through detection and quantitative analysis, can judge whether each stove district pollutent occurs unusually to composition of fumes.And can judge the accumulating amount of stove internal contamination thing and to the pollution level of equipment in the stove (like furnace roller) according to long-term detection data.These not only are that maintenance and maintenance provide foundation, make preventive maintenance and maintenance become possibility simultaneously.
3, improve reference for searching steel strip surface defect
In cold rolling and pot galvanize process of producing product, be a lot of owing to equipment reason in the lehre stove causes the product surface quality problem, common deficiency such as dent, wiping scuffing, bright spot, zinc are spent inequality or the like.At present owing in stove, do not detect, have only find defective in the production after, just know to have problem in the stove, stove is very big, problem go out at what position be difficult to definite.Lift a common example, the cold rolled continuous annealing unit of a production auto sheet finds that aborning there is slight dent (this operating mode can not be produced high-quality product) in product surface.Can judge what the furnace roller dross caused according to the spacing of dent; But general auto sheet unit lehre has nearly hundred furnace rollers usually, directly is main with two kinds of rollers, and each all has tens; Even we know the sort of roller footpath furnace roller existing problems, but can not confirm it is which root.If the removing dross, minimumly need 4-5 days time.Because need open the bell of nearly half quantity, and to checking very time-consuming of these work one by one by in-problem furnace roller.If can detect the issue and the high stove district of Pollutant levels of stove internal contamination thing, the scope that just can dwindle inspection is because furnace roller dross and environmental pollution substrate concentration are proportional.
Description of drawings
Fig. 1 is the schematic diagram of continuous annealing furnace furnace atmosphere degree of cleaning detection system.
Fig. 2 purges the nitrogen supply (NS) systematic schematic diagram.
Fig. 3 is cooling drying system and divider schematic diagram.
Fig. 4 is the DACS schematic diagram that degree of cleaning detect.
Among the figure: 1. lehre furnace chamber (be called for short " furnace chamber "); 2. gas sampled water cooler; 3. gas distributor; 4. manual switch valve; 5. pressure detection instrument; 6. pressure signal is changed display instrument; 7. gas temperature detector; 8. automatic switch valve; 9. reverse checkvalve; 10. total amount of pollutant scoop; 11. analysis scoop; 12. decollator; 13. water collector; 14. strainer; 15. sampling volume pump; 16. loopback gas flow dryer; 17. reducing valve; 18. nitrogen station; 19. refrigerator; 20. stainless steel serpentine tube; 21. board-like cooling fin; 22. automatic repid cut-off valve; 23. temperature detector; 24. liquidometer; 25. unit; 26. show and operating panel (being called for short " operating panel "); 27. computingmachine; 28. system power supply.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described further.
Embodiment 1. continuous annealing furnace furnace atmosphere degree of cleaning detection systems
Continuous annealing furnace furnace atmosphere degree of cleaning detection system provided by the invention mainly is responsible for by the furnace gas sampling person in charge, gas pollutant scoop branch road, metering and gas loopback and is formed.Wherein: said furnace gas sampling is responsible for, and its input terminus is through pipeline and 1 interior connection of lehre furnace chamber, and its output terminal links to each other with the input terminus of gas pollutant total amount scoop branch road through pipeline, and links to each other with the output terminal in nitrogen purging loop.The input terminus that the output terminal of gas pollutant scoop branch road is responsible for through a pipeline and metering and gas loopback links to each other.The input terminus in nitrogen purging loop is communicated with the nitrogen station through pipeline; Two the manual switch valves 4 of this nitrogen purging loop through its serial connection are connected in parallel on the pipeline of gas distributor 3 that the furnace gas sampling is responsible for, automatic switch valve 8.The output terminal that metering and gas loopback are responsible for is by pipeline and 1 interior connection of lehre furnace chamber.
Said furnace gas sampling is responsible for; As shown in Figure 1: form by gas sampled water cooler 2, gas distributor 3, the first manual switch-valve 4, pressure detection instrument 5, pressure signal conversion display instrument 6, first automatic switch valve 8 successively along air flow line, after meet the access point d of gas pollutant scoop branch road.Be provided with a, b, three purgings of c nitrogen access point in addition, the air tight test and the security that are used for the detection system pipeline purge, and can carry out the spatter property purging to the pipeline of putting from furnace inner sampling between the detection system.Nitrogen access point a is positioned at one tunnel ingress of gas distributor 3, and nitrogen access point b is between the pressure detection instrument 5 and first automatic switch valve 8, and nitrogen access point c is positioned at after first automatic switch valve 8, before the scoop branch road contact d.
Said gas pollutant scoop branch road (part in the frame of broken lines among Fig. 1); This branch road is the parallel connection of two-way scoop; Wherein the first via is to be furnished with the total amount of pollutant scoop 10 of preposition reverse checkvalve 9 and front and back manual switch valve 4, and wherein total amount of pollutant scoop 10 is a filterableness collection device, and its filter core is the highest to tolerate 70 ℃ of temperature; And can filter the solid particulate matter of the above particle diameter of 1 μ m, be used for the pollutent of the on-gaseous of quantitative collection furnace gas.The second the tunnel is to be furnished with the scoop 11 that the Pollutant analysis of preposition reverse checkvalve 9 and front and back manual switch valve 4 is used, and gas gets in the scoops 11 through decollator 12, is used to collect pollutent and supplies chemical composition analysis.The effect of reverse checkvalve 9 is to prevent gas backstreaming.When manual switch valve 4 is used to measure, open or close this gas branch road.
Above-mentioned gas contaminant collector branch road also has a bypass (being called for short " scoop bypass "); From scoop branch road contact d directly through an automatic switch valve 8 (because this automatic switch valve is positioned in the bypass; Hereinafter referred " by-pass valve "), is used for that system starts, stops, working order is changed and the operation of accidental state to scoop branch road contact e.
Said metering and gas loopback are responsible for; As shown in Figure 1: e comes out from scoop branch road contact; Along air flow line, form by water collector 13, strainer 14, pressure detection instrument 5, pressure signal conversion display instrument 6, sampling volume pump 15, reverse checkvalve 9, second automatic switch valve, 8, the second manual switch-valve 4 and loopback gas flow dryer 16 successively.Water collector 13 is in the minimum level position of total system, is used for collecting the condensed water of pipeline and concentrating discharging, and this water collector inner and upper is equipped with gas temperature detector 7.Gas temperature detector 7 and pressure detection instrument 5 are used to measure temperature, the pressure of furnace gas, to revise the volumetric flow rate of sampling gas.The peak flow scope of sampling volume pump 15 is 15-60Nm
3/ h, 70 ℃ of maximum operating temperatures are used to provide the negative pressure that extracts furnace gas, the furnace gas of accurate measurement simultaneously flow.Reverse checkvalve 9 can prevent that gas from flowing backwards.The 16 main effects of loopback gas flow dryer are the dew points that reduce the gas after taking a sample, and preventing influences furnace atmosphere after the loopback.
In order to narrate conveniently, the common closed loop that constitutes is responsible in the furnace gas sampling person in charge, scoop bypass and metering and gas loopback that Fig. 1 frame of broken lines is outer, is called degree of cleaning detection system master loop (hereinafter referred " master loop ").Part abbreviates " scoop branch road " as in the frame of broken lines.
Other subsystems that brief description is relevant with the present invention.
(1). gas cooling and cooling water recirculation system
Be protection detection system instrument safety, the gas of extracting out in the stove must be cooled to below 50 ℃, therefore is provided with gas sampled water cooler 2 in the ingress of degree of cleaning detection system.Because the furnace gas dew point requires to be lower than-3 ℃ ~-45 ℃ (the different process section has difference); Loopback gas (selecting certain point of stove inlet to concentrate loopback usually) must carry out drying treatment; Avoid causing inner operating is exerted an influence; So be provided with loopback gas cooling moisture eliminator 16 in the exit of detection system, to reduce the dew point of loopback gas.
Gas cooling drying and cooling water recirculation system are as shown in Figure 3.Cooling water recirculation system is by pressure detection instrument 5, refrigerator 19, temperature detector 23, liquidometer 24, loopback gas flow dryer 16, and one group of board-like cooling fin 21 in the gas sampled water cooler 2 is formed.Fill de-salted water in the gas sampled water cooler 2, auxiliary point can adopt artificial the interpolation perhaps directly to be connected with the de-salted water pipeline of producing unit, by the 4 direct moisturizings in the water tank of gas sampled water cooler of manual switch valve.Each sampling spot is connected in sampling slip (is example with three place's sampling spots) before furnace gas sampling is responsible for and the stove; Because being responsible for, the furnace gas sampling receives gas distributor 3 controls; So each sampling only has the furnace gas of a sampling spot through the stainless steel serpentine tube 20 in the gas sampled water cooler 2, gets into the gas degree of cleaning then and detects master loop.Through sending back in the stove behind metering and the gas loopback person in charge entering loopback gas flow dryer 16.
Gas sampled water cooler 2 is that board-like cooling fin 21 (abbreviation cooling fin) is arranged on a casing the inside of filling water; Simultaneously at many stainless steel serpentine tubes 20 of bottom half coiling; Stainless steel serpentine tube one end be connected from each regional stopple coupon of stove, the other end is connected with gas distributor 3.The principle of gas sampled water cooler is the cryogenic refrigeration working medium that feeds in the cooling fin from refrigerator 19, the water in the cooling fin cooling casing, and water cools off the high-temperature gas in the stainless steel serpentine tube 20 again.Temperature detector 23 and liquidometer 24 are set in the gas sampled water cooler, water temperature and liquid level signal are sent to unit 25, unit 25 will be according to water temperature and furnace gas temperature, the ability of adjustment refrigerator and the feeding of make up water.
Loopback gas flow dryer 16 is to utilize low temperature dewfall principle; Board-like cooling fin 21 is set in the moisture eliminator casing; Feed cryogenic refrigeration working medium in this cooling fin from refrigerator 19, when furnace gas during through cooling fin, the water in the loopback gas will be on cooling fin dewfall; After the collection dew is left in the disposal facilities that loopback gas flow dryer 16 carries; When check system restarts or changes scoop, unit will be controlled disposal facilities when master loop starts the purging state, utilize purging pressure to efflux dew and ducted gas.
Above-mentioned stopple coupon watercooler 2 has similar device structure with loopback gas flow dryer 16, only on the refrigerative temperature parameter, difference is arranged.Stopple coupon watercooler 2 only is cooled to 50 ℃ ~ 60 ℃ with the high-temperature furnace gas of extracting out, with the instrumentation of protection analysis of pipeline; Loopback gas flow dryer 16 then is to utilize the more cooling working medium of low temperature (0 ~ 20 ℃), reduces gas temperature through heat exchange mode, makes the water vapor condensation in the gas, to improve gas dew point, equipment in the stove is produced corrosion after preventing to send back to furnace chamber.
Above-mentioned pressure detection instrument 5 all links to each other with unit 25 through pressure signal conversion display instrument 6 with cable.
(2). purge the nitrogen supply (NS) system
Purging nitrogen system mainly is that pipeline is done airtight test, duct cleaning, pipe safety purging usefulness.Nitrogen is generally provided by pipe network in the factory, also can be provided by special nitrogen storage tank or nitrogen station.With nitrogen station air feed is example, and the high pressure nitrogen that comes out from nitrogen station 18 by manual switch valve 4 control break-makes, after reducing valve 17 reduces pressure, is divided into two-way through reverse checkvalve 9 and pressure detection instrument 5 again and carries.
The first via respectively through two manual switch valves 4, feeds " N through automatic switch valve 8 back bifurcations
2Access point a " and " N
2Access point b "." N wherein
2Access point a " be used for the spatter property purging, the manual switch valve 4 before the access point is in closing condition all the time, only need carry out just opening when spatter property purges at shutdown maintenance." N
2Access point b " be used to detect airtight test, the manual switch valve 4 before the access point is in open mode all the time when the degree of cleaning detection system is worked, only need carry out just closing when spatter property purges at shutdown maintenance.
The second the tunnel through the direct " N that feeds in automatic switch valve 8 backs
2Access point c ", the security that is used for detection system purges.
When carrying out the spatter property purging, nitrogen pressure is 1bar (100kPa) ~ 2bar (200kPa); When carrying out air tight test, security purging, nitrogen 0.7bar (70kPa) ~ 0.8bar (80kPa).
(3). system
System mainly is made up of operating panel 26, computingmachine 27, system power supply 28, unit 25 etc.Wherein show with operating panel 26 and comprise that parts such as operation keyboard, image display, label machine, PL, combined aural and visual alarm, various action buttons constitute, and are mainly used in setting, state demonstration, warning and label printing or the like.Computingmachine 27 and unit 25 are to be responsible for system logic and sequential control, data processing and calculating, system communication or the like content.
The display frame of system function comprises:
1. set picture--be used for sampling spot selection and gas sampled amount and set or the like.
2. purge the state picture--the selection of gas distributor sampling line when the monitoring and the spatter property that are used to the state of purging purge.
3. resistance to air loss detects picture--be used to show the resistance to air loss detected state.
4. fault alarm display frame--be used for indicating system and overpressure situation whether occur in sampling process.
5. scoop display frame--be used for each collector status demonstration and scoop gas flow and show.
6. key frame--indicating system overall operation state.
7. label display frame--whole scoop samplings finish the back indicating meter can occur label display frame automatically, and label display frame will provide following information in proper order according to the numbering and the sampling of scoop: scoop numbering, take a sample start and end time, sampling spot position, gas sampled amount, gas sampled detected temperatures.Press printer button and can print label, be bonded on the scoop.
The application of embodiment 2. continuous annealing furnace furnace atmosphere degree of cleaning detection systems
Said detecting system provided by the invention is used in medium-to-high grade automobile or the household electrical appliances panel production field the manual detection to continuous annealing furnace furnace atmosphere degree of cleaning.This detection system detects based on following method, and specifically: with the sampling volume pump gas in the lehre furnace chamber is extracted out, and made furnace gas pass through scoop according to the flow of setting, various PM for particulate matters just are delayed in the scoop in the furnace gas; The sampling volume pump can be measured the volume of gathering furnace gas automatically, and will the take a sample signal of the temperature and pressure that instrument before the volume pump measures of unit sends CP to, and making the volume unit conversion of furnace gas is SCM; Weight difference according to total amount of pollutant scoop filter core before and after the sampling obtains the gross weight of stove district suspended particulate of taking a sample, thereby obtains the concentration of PM for particulate matter in the furnace gas; Through each stove district furnace gas degree of cleaning total amount being detected assessment stove internal contamination degree; Deliver to Chemical Analysis Lab and test analyzing pollutent in the scoop, the composition of the stove district pollutent that obtains taking a sample through detection and analysis to each stove district composition of fumes, judges whether each stove district noxious occurs unusually then.
This detection method is defined as the degree of cleaning of furnace gas in the continuous annealing furnace: the concentration of liquid, solid, liquid-solid composite grain thing in furnace gas degree of cleaning=unit volume furnace gas, unit is milligram (or microgram) every SCM.
Detection system of the present invention adopts following steps to realize the manual detection of gas degree of cleaning.
The first step is measured and is prepared.
1). close the manual switch valve 4 in the scoop branch road earlier, total amount of pollutant scoop 10 is installed then and is analyzed scoop 11.
2). connect system power supply 28; Turn on the power switch; Start computingmachine 27 and unit 25; Whether system gets into automatically and detects and start set up procedure, comprise the starting state that detects refrigerator 19, detect the water temperature whether automatic switch valve 8 be in closing condition, detection gas sampled water cooler 2 and meet the demands or the like.When test item reaches requirement, the start button PL on the operating panel 26 is bright, and the prompting that starts appears allowing in operation screen.
3). the manual switch valve 4 of detection system is all got to the position of " opening "; " start button " on the push panel 26; System will get into the resistance to air loss trace routine automatically, and resistance to air loss detected state picture appears in the indicating meter on the operating panel 26 at this moment.It is qualified to detect, and the resistance to air loss PL is green, and system changes the purging program automatically over to; And in display frame, express the purging state, and promptly use the nitrogen purging pipeline, the air in pipeline and the equipment is discharged; After purging completion, PL changes green into, and unit 25 will cut out whole automatic switch valve 8; For sampling is prepared, this moment, picture appearred setting in indicating meter.If resistance to air loss is defective, the resistance to air loss PL is red, and sends the chimes of doom optical signal, needs the hand inspection connecting portion whether to have leakage.Behind the intact leak point of manual handling, " start button " on the push panel 26 again.Repeat above-mentioned work, till resistance to air loss is qualified.After the resistance to air loss detection is qualified, need the closed portion manually-operated gate, like " N
2Access point a " preceding manual switch valve 4.
In second step, sampling is set.
Accomplish sampling spot selection and the setting of gas sampled amount through the keyboard on the operating panel 26.Through the manual valve 4 of total amount of pollutant scoop 10 or analysis scoop 11 front and back, select to adopt which scoop.For example, open the manual valve 4 of total amount of pollutant scoop 10 front and back, close the manual valve 4 of analyzing scoop 11 front and back, promptly accomplish the selection of total amount of pollutant scoop.In the extraction flow and the total amount of operating panel 26 setting sampling volume pumps 15, send instruction to sampling volume pump 15 through unit 25.
The 3rd step, gas sampling.
1). after accomplishing preparation work and sampling setting, " sampling starts " button on the push panel 26, the scoop picture appears in indicating meter at this moment, and unit sends the master loop operating instruction, promptly opens first automatic switch valve 8 among the furnace gas sampling person in charge.Gas distributor 3 is according to the Instruction Selection gas passage (centre one road sampling spot to be set at furnace chamber 1 is an example) of unit 25.Start sampling volume pump 15 lehre furnace high-temperature gas is extracted out in the lehre furnace chamber 1 of pressure-fired,, the temperature of high-temperature furnace gas is reduced to below 50 ℃ through gas sampled water cooler 2; At this moment, because the by-pass valve 8 of scoop branch road is in open mode, the gas flow resistance is minimum; Gas sampled without the scoop branch road (although total amount of pollutant scoop 10 is in open mode; Because the filter core drag effect, gas flows along the resistance smallest passage), return in the stove along master loop.If pressure detection instrument 5 and gas temperature detector 7 are at 30 seconds master loops in working time in the master loop; The detected value that sends unit to is all the time in allowed band; Unit sends out code to by-pass valve 8; Send to begin to measure to sampling volume pump 15 simultaneously and instruct, gas sampled will be returned in the stove through the closed loop that the total amount of pollutant scoop in the scoop branch road 10 forms.Under the filteration of filter core, various particle diameters just are delayed in the total amount of pollutant scoop 10 greater than the PM for particulate matter of 1 μ m in the furnace gas in total amount of pollutant scoop 10.When the rate of air sucked in required of sampling volume pump 15 reached set(ting)value, unit 25 at first sent OPEN to by-pass valve 8, and unit 25 will stop the volume pump 15 of taking a sample after the time-delay several seconds, close all automatic switch valves 8 on the master loop.Show the sampling completion on the operating panel 26, get into and purge condition prompting.After purging end, operating panel 26 shows the purging completion statuses.First scoop sampling process finishes, and system shows the prompting that can carry out next scoop sampling.
2). the sampling that repeated for second step is set, and selects next sampling collector (as selecting to analyze scoop 11).
3). repeat the operation in " the 1) " step in the 3rd step, use next scoop (as analyzing scoop 11) to carry out contaminant collecting.
4). the volume calibration of gas sampled:
It is unit that SCM is all adopted in gas sampling, and operator set the gas sampled amount on operating panel 26 be SCM, because the temperature and pressure of gas is different, need carry out the volume conversion, the actual value of proofreading and correct the sampling volume pump during sampling.Therefore; Water collector 13 tops before sampling volume pump 15 are provided with gas temperature detector 7; Before sampling volume pump 15, gaseous tension measuring instrument 5 is arranged, the actual temperature and the force value of gas sampled are passed to computingmachine 27 through unit 25 with signal, computingmachine calculates through the equation of gas state; Give the sampling volume pump 15 1 corrections, so just can obtain standard rate of air sucked in required numerical value.
The process of the volume calibration of gas sampled is: through the furnace gas behind total amount of pollutant scoop 10 and the analysis scoop 11; Through manual switch valve 4, get into water collector that gas temperature detector 7 be housed 13, strainer 14 and the pressure detection instrument 5 this moment unit 25 of metering in being responsible for the gas loopback and send the pressure and temperature signal of the gas that obtains to computingmachine 27 and handle; Computingmachine calculates through the equation of gas state; Give the sampling volume pump 15 1 corrections; Then; Furnace gas successively through going into sampling volume pump 15, reverse checkvalve 9 and automatic, the manual switch valve among metering and the gas loopback person in charge, gets into loopback gas flow dryer 16 again, is sent back in the lehre behind the furnace-heated; When the rate of air sucked in required of sampling volume pump 15 reaches set(ting)value+correction, quit work, automatic switch valve 8 is closed, and the prompting that gas sampling completion and system get into pipeline purging state appears in indicating meter simultaneously
In the 4th step, pipeline purges.
The purpose that degree of cleaning detection system passage purges has two aspects: the one, and use nitrogen to replace with remaining in the furnace gas that has hydrogen in the passage, the safety when changing scoop with assurance.This purging is called security and purges, and is accomplished automatically by system.The 2nd, purge from the furnace inner sampling point to the sampling arm the degree of cleaning detection system, to guarantee duct cleaning, precision and accuracy that raising detects.This purging is called spatter property and purges, and only when shutdown maintenance, utilizes the high pressure nitrogen of nitrogen station 18 supplies of the nitrogen supply (NS) system that purges (being called for short the nitrogen purging system), is controlled by operator each sampling arm is purged.
Security purges: after the detection of degree of cleaning detection system completion resistance to air loss is qualified; And after the prompting of " sampling is accomplished; get into the purging state " appearred in the indicating meter in the operating panel 26, system will be carried out following purging program: unit 25 at first sent instruction to gas distributor 3, closed all repid cut-off valve 22 automatically; Open the automatic switch valve 8 of detection system, open the automatic switch valve 8 of nitrogen purging system.Purge nitrogen and get into " N through manual switch valve 4, reducing valve 17, reverse checkvalve 9, pressure detection instrument 5, automatic switch valve 8 from unit pipe network or nitrogen station 18
2Access point c ".Because the by-pass valve 8 of contaminant collector bypass is opened; Therefore at first purge the detection system master loop; Nitrogen gets in the lehre through master loop, and each sampling spot branch road purge time is not less than 15 seconds, reach the purge time of setting after; Unit cuts out bypass automatic switch valve 8, and purging nitrogen will constitute in the loop entering lehre through the scoop branch road.After reaching purge time, unit 25 will send instruction, close whole automatic switch valves 8 of nitrogen purging system and detection system, show on the operating panel 26 to purge to finish.After security purges and accomplishes,, can take off total amount of pollutant scoop 10 and analyze scoop 11, send the Chemical Analysis chamber to weigh and composition analysis through opening total amount of pollutant scoop 10 and the junction of analyzing scoop 11, and the scoop that more renews.
Spatter property purges: during shutdown maintenance, need carry out the spatter property purging to the pipeline of putting from furnace inner sampling between the gas sampled water cooler 2.Operator at first close whole manual switch valves 4 that the furnace gas sampling is responsible for and the gas loopback is responsible for, and connect system power supply 28, the start-up control system, and carry out self check.After self check is normal, automatic switch valve 8 Close Alls that the furnace gas sampling is responsible for, the refrigerator 19 in sampling volume pump 15 and the cooling system also is in closing condition.Close whole manual switch valves 4 and the " N of nitrogen purging system that the furnace gas sampling person in charge and metering and gas loopback are responsible for
2Access point b " preceding manual switch valve 4; Open " N
2Access point a " preceding manual switch valve 4, and close " N through operating panel 26
2Access point c " preceding automatic switch valve 8, open the manual switch valve 4 before the reducing valve 17, manual regulation purges nitrogen pressure.In order to guarantee to purge totally, purge the high pressure purging mode of design specially for spatter property, through monitor pressures measuring instrument 5 and manual setting reducing valve 17, nitrogen pressure is remained on 1 ~ 2bar (between 100 ~ 200kPa).Select gas distributor 3 passages through operating panel 26, and open " the N of nitrogen purging system
2Access point a " preceding automatic switch valve 8, nitrogen can purge each sampling line through gas distributor 3 reverse being blown in the stove.Select gas distributor 3 each passages by the same way, one by one sampling line is carried out spatter property and purge.
The 5th step, the concentration of pollutent and composition detection in the furnace gas.
Total amount of pollutant scoop 10 is solid filters, and the filter core of this strainer can for convenience detach and replacing.Before the work, need weigh to filter core, be installed in the fixed position in the scoop then at the high precision balance.After sampling is accomplished filter core is taken out, be placed on and carry out secondary weighing on the high precision balance, the weight difference of weighing for twice is the gross weight of this sub-sampling of sampling stove district, and this weight promptly can obtain the concentration of PM for particulate matter in the furnace gas divided by the volume of sampling furnace gas.
Pollutant analysis scoop (11) is a comprehensive scoop, and it is one and has the graduated vial of liquid level that zero(ppm) water or other lysates are equipped with in the inside.Furnace gas evenly scatters to gas sampled in zero(ppm) water or the lysate through decollator (12), can increase the contact area of gas sampled and lysate like this, makes dissolved, the detention as much as possible of furnace gas noxious, is deposited in the liquid.After sampling finishes, the vial that liquid is housed is taken off, send the Chemical Analysis chamber to carry out the chemical ingredients check,, promptly can obtain the concentration ratio of noxious heterogeneity in the furnace gas the assay of its noxious composition and ratio volume divided by the furnace gas of taking a sample.Because the noxious composition is very complicated in the stove; The metal, the lubricant component that come off like belt steel surface; Equipment comes off in the stove lagging material and metallics; Also there is zinc fume or the like for zinc-plated continuous annealing furnace,, can more comprehensively reflects the state of arts in the stove so this analysis can be carried out multianalysis to material composition, the ratio analyzed in the scoop.
Through above-mentioned five steps, can accomplish detection to continuous annealing furnace furnace gas degree of cleaning.
Three. the appraisal procedure of furnace gas pollution level.
Through discovering that noxious has following characteristic in the stove:
1. accumulation characteristics: along with the increase of continuous annealing furnace continuous production time, the total amount that noxious is hoarded in stove increases.The possibility that suspended substance " outburst " takes place in the stove increases.As because too fast speed adjustment or the temperature variation of carrying out, the noxious of hoarding and sticking to equipment surface in the stove is suspended again, cause local stove district Pollutant levels explosive type to increase.
2. migrate attribute in the stove: noxious can flowing or stick to belt steel surface and move to other stove district from a stove district along with furnace gas in the stove.The migration distance of noxious is smaller in ordinary production, and often this is abnormal because factors such as mal-operation or raw material surface clearness difference cause the migration distance increase.
3. noxious composition profiles relative stability: under the ordinary production situation, the noxious composition profiles is metastable in the stove.Through detecting the variation of noxious composition profiles in the stove, some problems that exist in can finding in advance to produce.
4. chemical transformation characteristic: like iron oxide reduction is iron;
5. liquid to solid-state conversion characteristic: carbonization becomes carbon granule like the oil-containing drop;
6. suspend, characteristic is grown up in coalescence: as little liquid-solid particle in suspension each other collision form macrobead, macrobead is assembled and is formed cluster of grains.
7. adhesion characteristics: as stick to roll surface and form carbon distribution or dross.
8. liquid object is hoarded and boiling characteristics once more: stove endoparticle thing exists with liquid-solid mixed state usually; These materials stick to the interior equipment surface of stove or accumulate in some zone of furnace bottom; Liquid object under low-temperature condition in these materials keeps ortho states; When temperature raise, fluent meterial can volatilize again and form new drop.
9. there are reciprocal characteristics in adhesion and sedimented particle: stick to the particle that the interior equipment surface of stove perhaps is deposited in eminence equipment surface in the stove, perhaps become suspended particle again under air-flow or the like effect of factors in vibration.
The furnace gas degree of cleaning receive the influence of three aspect factors, go into the influence of furnace zone steel surface clearness that is:; The influence of furnace installation factor (mainly being manufacturing, the installation and maintenance level of equipment); The influence of operation and technological factor.
The product requirement furnace gas degree of cleaning of producing the different surfaces quality grade arrive the target value of demands of different, otherwise can't guarantee to produce in batches.
The assessment of stove internal contamination degree adopts correlated method to carry out usually for these reasons.
The target degree of cleaning are meant and produce the average index that the different grades quality product need arrive degree of cleaning, promptly produce certain kind for the previous period in, the MV of stove district degree of cleaning index separately.This MV is confirmed after repeatedly producing some quality grade products.
Through each stove district furnace gas degree of cleaning total amount is detected, contrast target degree of cleaning index can directly be assessed stove internal contamination degree; And, can judge whether each stove district noxious composition profiles occurs unusually through to the detection and the analysis of each stove district composition of fumes, if exist unusually, can combined process in time find the problem that exists.Detect according to degree of cleaning weight and composition profiles, can confirm that current lehre possesses the condition of producing what quality grade product.
For the furnace gas sample of obtaining has more representativeness, the furnace gas sampling spot should be noted that when selecting:
1). move back unit for newly-built company, below the furnace roller sampling spot is set up and down in the outlet of lehre preheating section; Below the furnace roller sampling spot is set up and down in heating zone and soaking zone; Below the furnace roller sampling spot is set up and down at the overaging entrance and exit.For newly-built pot galvanize unit, below the furnace roller sampling spot is being set about the preheating section outlet of lehre; Below the furnace roller sampling spot is set up and down in heating zone and soaking zone; At equalizer section and thermotension roller zone sampling spot is set.
2., can utilize dew point to detect pipeline and perhaps utilize interim sampling spot connecting tube to take a sample) for the stove of having produced.Avoid the cycle that dew point detects if utilize dew point detector pipeline should be noted that, must collect the detection signal of dew point detector, prevent simultaneously a some problem of sampling.
Claims (10)
1. continuous annealing furnace furnace gas degree of cleaning detection system; It is characterized in that this system mainly is made up of the furnace gas sampling person in charge, gas pollutant scoop branch road, metering and the gas loopback person in charge; Wherein: said furnace gas sampling is responsible for; Its input terminus is communicated with through pipeline and lehre furnace chamber (1) are interior, and its output terminal links to each other with the input terminus of gas pollutant total amount scoop branch road through pipeline, and links to each other with the output terminal in nitrogen purging loop; The input terminus that the output terminal of gas pollutant scoop branch road is responsible for through a pipeline and metering and gas loopback links to each other; The input terminus in nitrogen purging loop is communicated with the nitrogen station through pipeline; This nitrogen purging loop is through two manual switch valves (4) of its serial connection; Be connected in parallel on the pipeline of gas distributor (3) that furnace gas sampling is responsible for, automatic switch valve (8), the output terminal that metering and gas loopback are responsible for is by pipeline and lehre furnace chamber (1) is interior is communicated with.
2. continuous annealing furnace furnace gas degree of cleaning detection system according to claim 1; It is characterized in that the said furnace gas sampling person in charge; Its structure is: form by gas sampled water cooler (2), gas distributor (3), the first manual switch-valve (4), pressure detection instrument (5), pressure signal conversion display instrument (6), first automatic switch valve (8) successively along air flow line, after meet the access point d of gas pollutant scoop branch road.
3. continuous annealing furnace furnace gas degree of cleaning detection system according to claim 2; It is characterized in that the said furnace gas sampling person in charge also is provided with a, b, three purgings of c nitrogen access point; The air tight test and the security that are used for the detection system pipeline purge; And can carry out the spatter property purging to the pipeline of putting from furnace inner sampling between the detection system, wherein: nitrogen access point a is positioned at one tunnel ingress of gas distributor (3); Nitrogen access point b is positioned between pressure detection instrument (5) and first automatic switch valve (8); Nitrogen access point c is positioned at first automatic switch valve (8) afterwards, before the scoop branch road contact d.
4. continuous annealing furnace furnace gas degree of cleaning detection system according to claim 1; It is characterized in that said gas pollutant scoop branch road is the parallel connection of two-way scoop; Wherein: the first via is used for the pollutent of the on-gaseous of quantitative collection furnace gas for being furnished with the total amount of pollutant scoop (10) of preposition reverse checkvalve (9) and front and back manual switch valves (4); The second tunnel scoop (11) used for the Pollutant analysis of being furnished with preposition reverse checkvalve (9) and front and back manual switch valves (4), gas gets in the scoop (11) through decollator (12), is used to collect pollutent confession chemical composition analysis.
5. continuous annealing furnace furnace gas degree of cleaning detection system according to claim 4; It is characterized in that said gas pollutant scoop branch road also has a bypass; From scoop branch road contact d directly through an automatic switch valve (8) to scoop branch road contact e, be used for that system starts, stops, the operation of working order conversion and accidental state.
6. continuous annealing furnace furnace gas degree of cleaning detection system according to claim 4; It is characterized in that said total amount of pollutant scoop (10) is a filterableness collection device; Its filter core is the highest to tolerate 70 ℃ of temperature, and can filter the solid particulate matter of the above particle diameter of 1 μ m.
7. continuous annealing furnace furnace gas degree of cleaning detection system according to claim 1; It is characterized in that said metering and the gas loopback person in charge; Its structure is: along air flow line; The water collector (13) that is linked to each other by pipeline successively, strainer (14), pressure detection instrument (5), pressure signal conversion display instrument (6), sampling volume pump (15), reverse checkvalve (9), second automatic switch valve (8), the second manual switch-valve (4) and loopback gas flow dryer (16) are formed; Water collector (13) is in the minimum level position of total system, is used for collecting the condensed water of pipeline and concentrates discharging.
8. continuous annealing furnace furnace gas degree of cleaning detection system according to claim 7 is characterized in that said water collector (13) inner and upper is equipped with gas temperature detector (7).
9. continuous annealing furnace furnace gas degree of cleaning detection system according to claim 7, the flow range that it is characterized in that said sampling volume pump (15) is 15-60Nm
3/ h, 70 ℃ of maximum operating temperatures are used to provide the negative pressure that extracts furnace gas, the furnace gas of accurate measurement simultaneously flow.
10. the purposes of the said continuous annealing furnace furnace gas of arbitrary claim degree of cleaning detection system in the claim 1 to 9 is characterized in that the application that continuous annealing furnace furnace gas degree of cleaning detect in medium-to-high grade automobile or household electrical appliances panel production field of this system.
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| CN102828014B (en) * | 2012-09-25 | 2013-09-04 | 鞍钢股份有限公司 | Method for controlling nodulation of carbon blind hearth roller |
| CN104596799A (en) * | 2014-12-31 | 2015-05-06 | 聚光科技(杭州)股份有限公司 | Sampling analysis system and detection method |
| CN107966186A (en) * | 2018-01-11 | 2018-04-27 | 中国计量大学 | A kind of continuous type gas collection and metering device |
| CN109738459A (en) * | 2019-03-06 | 2019-05-10 | 国福节能开发有限公司 | Surface cleanness on-line monitoring system |
| CN114414627A (en) * | 2022-03-28 | 2022-04-29 | 北京机电研究所有限公司 | Dew point inspection system for large heating furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2490167Y (en) * | 2001-06-20 | 2002-05-08 | 武汉钢铁(集团)公司 | Dew-point detecting device of continuous annealing furnace |
| CN201348619Y (en) * | 2008-12-30 | 2009-11-18 | 宝山钢铁股份有限公司 | On-line dew point detection system for high-precision continuous annealing oven |
| CN201809415U (en) * | 2010-08-31 | 2011-04-27 | 吕军 | Device for detecting cleanliness of furnace gas of continuous annealing furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2490167Y (en) * | 2001-06-20 | 2002-05-08 | 武汉钢铁(集团)公司 | Dew-point detecting device of continuous annealing furnace |
| CN201348619Y (en) * | 2008-12-30 | 2009-11-18 | 宝山钢铁股份有限公司 | On-line dew point detection system for high-precision continuous annealing oven |
| CN201809415U (en) * | 2010-08-31 | 2011-04-27 | 吕军 | Device for detecting cleanliness of furnace gas of continuous annealing furnace |
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