CN101988888B - Method for detecting cleanness of multiple sampling points automatically and continuously - Google Patents
Method for detecting cleanness of multiple sampling points automatically and continuously Download PDFInfo
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- CN101988888B CN101988888B CN2010102683103A CN201010268310A CN101988888B CN 101988888 B CN101988888 B CN 101988888B CN 2010102683103 A CN2010102683103 A CN 2010102683103A CN 201010268310 A CN201010268310 A CN 201010268310A CN 101988888 B CN101988888 B CN 101988888B
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Abstract
The invention relates to a method for detecting the cleanness of multiple sampling points automatically and continuously, which comprises the following steps of: pumping gas in a furnace chamber of an annealing furnace by using a sampling metering pump, controlling an automatic switch valve in a major loop to select collectors, and allowing furnace gas to pass through the currently-selected collector according to the set flow, so that various particulate matters in the furnace gas are blocked in the current collector; opening the collectors one by one by a controller according to the set sequence to collect pollutants continuously and automatically; solving the concentration of the particulate matters in the furnace gas of each sampling furnace area according to the weight difference of a filter cartridge of a total pollutant collector before and after sampling; analyzing matter components in a pollutant analyzing collector after the sampling to obtain the distribution ratio of different components of the furnace gas pollutants; and estimating the pollution degree in the furnace and judging whether noxious matters in each furnace area is abnormal or not through the detection of the cleanness of the furnace gas in each furnace area. By the method, the pollutants in the furnace can be detected accurately, so the method provides the reference for improving the quality of products and arranging blow-out overhauling and furnace cleaning reasonably.
Description
Technical field
The present invention relates to strip heat treatment technics field, cold rolled metal, relate in particular to the automatically continuous method for detecting cleaning degree of a plurality of sampling spots of a kind of realization, 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 product qualities improve still do not break through as the continuous annealing furnace of nucleus equipment, and the detection of furnace gas cleanliness is exactly one of them under the continuous annealing furnace production status.Current production and technician have clearly recognized the harmful effect that the furnace atmosphere spatter property brings equipment in product quality and the stove; And be placed on notice 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 of products qualification rate.Therefore, to the detection problem of continuous annealing furnace furnace gas cleanliness, caused the extensive concern of cold rolled automobile sheet, tame electroplax manufacturing enterprise.
A harmful type of material (being called for short nuisance or pollutant) mainly is in being suspended in stove or sedimentation, covers in stove equipment and have water vapor that changes the possible solid particle of suspension, filiform, floccus, droplet form particle, liquid-solid mixed state particle and oxygen, excess again into or the like in the stove.Wherein solid particle 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.Filiform and floccus 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 plant equipment oil leak forms in drop (comprising assorted oil) that the volatilization of water vapor drop, emulsion produces, the stove.Nuisance retains in stove and not only product quality is constituted a threat to and influence, and simultaneously equipment in the stove is caused damage.
The current quantity and the extent of injury that does not have this type objectionable impurities both at home and abroad proposes a kind of generally acknowledged decision method, more proposes ripe 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 matters to be solved by this invention is: for rationally confirming production technology to improve medium-to-high grade automobile, household appliances surface quality, what continuous annealing furnace furnace gas pollutant was provided realizes a plurality of sampling spots method for detecting cleaning degree continuously automatically fast, reliably.
The technical scheme that the present invention solves its technical matters employing is: the control major loop is extracted the furnace gas of each sampling spot of annealing furnace out according to the setting of controller; And according to setting order and flow; Furnace gas is successively through each gatherer; Various particles just are delayed in the gatherer in the furnace gas, accomplish until whole gatherers and collect, thereby realize the realization sampling in order automatically of a plurality of gatherers; Then according to the weight difference of total amount of pollutant gatherer filter core before and after the sampling, the general assembly (TW) of each the stove district suspended particulate substance that obtains taking a sample, thus obtain the concentration of particle in each sampling stove district furnace gas; Through each stove district furnace gas cleanliness total amount being detected assessment stove internal contamination degree; Pollutant in the gatherer is delivered to Chemical Analysis Lab test, the composition of the stove district pollutant that obtains taking a sample through detection and the analysis to each stove district composition of fumes, judges whether each stove district nuisance occurs unusually.
The present invention is based on following situation files an application: because continuous annealing unit and galvanizing unit nucleus equipment--annealing furnace adopt high temperature, airtight production status, the factor that influences product quality in the stove is detected very difficulty.Although annealing furnace has disposed the detection by quantitative of oxygen, hydrogen, dew point content, still can't reflect the situation of change in the stove comprehensively.Particularly the content of nuisance, distribution and variation are in blank basically to the monitoring that equipment in product quality and the stove influences in the furnace gas.If can realize the furnace gas cleanliness of each furnace gas diverse location are taken a sample at any time, carry out qualitative and quantitative detecting analysis, to produce instructing undoubtedly, plant maintenance 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 annealing furnace, 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 detection technique; The situation of furnace installation operation; Only can judge whether current production status satisfies the high quality of products requirement according to the industrial camera picture (being mainly used in the supervision of band steel position) of routine, limited detected 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; Improved the level of controlling; For improving the quality of products, cause high quality of products degradation or underproof probability for reducing or stopping because of inner operating is not clear, possibility 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 of products even.Through detection and quantitative test, can judge whether each stove district pollutant 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 can for the maintenance and maintenance foundation is provided.
3. continuously automatically sampling can be removed from manually operated loaded down with trivial detailsly, reduces the operating mistake odds, improves the pollutant detection efficiency.
Description of drawings
Fig. 1 is a schematic diagram of realizing the automatically continuous cleanliness detection system of a plurality of sampling spots.
Fig. 2 is that the pollutant among Fig. 1 is collected the branch road schematic diagram continuously automatically.
Fig. 3 purges the nitrogen supply (NS) systematic schematic diagram.
Fig. 4 is cool drying system and divider schematic diagram.
Fig. 5 is the Data Acquisition and Conversion System (DACS) schematic diagram that cleanliness detect
Among the figure: 1. annealing furnace furnace chamber (hereinafter referred " furnace chamber "); 2. gas sampled refrigeratory; 3. gas distributor; 4. hand switch valve; 5. pressure detection instrument; 6. pressure signal is changed Displaying Meter; 7. gas temperature detector; 8. automatic switch valve; 9. reverse checkvalve; 10. total amount of pollutant gatherer; 11. analysis gatherer; 12. decollator; 13. water collector; 14. filtrator; 15. sampling volume pump; 16. loopback gas flow dryer; 17. reduction valve; 18. nitrogen station; 19. refrigeration machine; 20. stainless steel coiled pipe; 21. board-like cooling fin; 22. automatic repid cut-off valve; 23. temperature detector; 24. liquid level gauge; 25. controller; 26. show and guidance panel (hereinafter referred " guidance panel "); 27. computing machine; 28. system power supply.
Embodiment
The automatically continuous method for detecting cleaning degree of a plurality of sampling spots of realization provided by the invention; Specifically: gas in the annealing furnace furnace chamber is extracted out with the sampling volume pump; The automatic switch valve that control is collected in the branch road is continuously automatically selected gatherer; And make furnace gas according to the flow of setting through the current gatherer of selecting for use, various particles just are delayed in the gatherer in the furnace gas.Controller is opened gatherer one by one according to the setting order, realizes contaminant collecting continuously and automatically.The volume of the collection furnace gas when the sampling volume pump can be measured each the sampling automatically, the temperature and pressure according to the instrument before the sampling volume pump is measured is normal cubic metre with this volume unit conversion.According to the weight difference of total amount of pollutant gatherer filter core before and after the sampling, the general assembly (TW) of each stove district suspended particulate substance that can obtain taking a sample, thus obtain the concentration of particle in each sampling stove district furnace gas.Through each stove district furnace gas cleanliness total amount is detected, can assess stove internal contamination degree; Deliver to Chemical Analysis Lab and test analyzing pollutant in the gatherer, the composition of the stove district pollutant that can obtain taking a sample through detection and the analysis to each stove district composition of fumes, can judge whether each stove district nuisance occurs unusually.
The present invention is defined as the cleanliness of furnace gas in the continuous annealing furnace: the concentration of liquid, solid, liquid-solid composite grain thing in furnace gas cleanliness=unit volume furnace gas, unit is milligram (or microgram) every normal cubic metre.
This mode can realize being taken a sample continuously automatically in a plurality of stoves district; It is fast to improve sample rate, reduces and receives the frequency of changing gatherer, and automaticity is higher; Adapting to annual production greater than 100,000 tons, is master's all kinds of continuous annealing furnaces to produce the high-quality household appliances.
Below in conjunction with embodiment and accompanying drawing the present invention is described further.
Method provided by the invention utilization realizes that the automatically continuous cleanliness detection system of a plurality of sampling spots realizes.In order to be beneficial to description this method, the composition of this detection system is described at first.
One. realize the composition of the automatically continuous cleanliness detection system (abbreviation detection system) of a plurality of sampling spots
The structure of this detection system is as shown in Figure 1: mainly be responsible for by the furnace gas sampling, the furnace gas pollutant is collected branch road continuously automatically, and metering is responsible for three parts with the gas loopback and is formed.
First is that the furnace gas sampling is responsible for; As shown in Figure 1: form by gas sampled refrigeratory 2, gas distributor 3, the first manual switch valve 4, pressure detection instrument 5, pressure signal conversion Displaying Meter 6, first automatic switch valve 8 successively along airflow direction, after meet the access point d of gas pollutant gatherer branch road.Be provided with a, b, three purgings of c nitrogen access point in addition, the cleaning that is used for system's interior conduit purges.Nitrogen access point a is positioned at one tunnel porch 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 gatherer branch road contact d.
Second portion is that the furnace gas pollutant is collected branch road continuously automatically, and " collecting branch road automatically " its detail drawing in Fig. 1 frame of broken lines is as shown in Figure 2.Behind gatherer branch road access point d, be divided into the collection branch road of 2 groups of parallel connections.First group is that the total amount of pollutant is collected the branch road group; This branch road is a shared reverse checkvalve 9 behind access point d; Be divided into a plurality of gatherer branch roads subsequently; Situation with two gatherer branch roads among Fig. 2 is an example, and each gatherer branch road is preposition automatic switch valve 8, preposed manual switch valve 4, total amount of pollutant gatherer 10, rearmounted hand switch valve 4, rearmounted automatic switch valve 8 and forms.Wherein contaminant collector 10 is a filterableness gathering-device, and its filter core is the highest to tolerate 70 ℃ of temperature, can filter the solid particulate matter of the above particle diameter of 1 μ m, is used for accomplishing the collection of furnace gas solid particulate matter.The maximum flow scope of sampling volume pump 15 is 15-60Nm
3/ h, 70 ℃ of maximum operating temperatures.Second group is that the branch road group is collected in pollutant analysis; This branch road is a shared reverse checkvalve 9 behind access point d; Be divided into a plurality of gatherer branch roads subsequently; Situation with two gatherer branch roads among Fig. 2 is an example, and each gatherer branch road is preposition automatic switch valve 8, preposed manual switch valve 4, gas distributor 12, analyzes gatherer 11, rearmounted hand switch valve 4, rearmounted automatic switch valve 8 are formed.Analyzing in the gatherer 11 has solution, can with the pollutant detention wherein be used for chemical composition analysis.All gatherer branch roads can be bonded to contaminant collector branch road contact e place at last.
The furnace gas pollutant is collected branch road continuously automatically and is also had a bypass (being called for short " gatherer bypass "); From gatherer 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 system start-up, stops, the operation of duty conversion and accident condition to gatherer branch road contact e.
Third part is responsible for for metering and gas loopback; E begins from gatherer branch road contact, and water collector 13, filtrator 14, pressure detection instrument 5, pressure signal conversion Displaying Meter 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 that gas thermometry appearance 7 is installed by inner and upper are formed.Water collector 13 is in the floor level position of total system, is used for collecting the condensate and concentrated discharging of pipeline.Gas thermometry appearance 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 maximum 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 analyzing, and preventing influences furnace atmosphere after the loopback.
In order to narrate conveniently, Fig. 1 can be divided into two parts.Part abbreviates automatic collection branch road as in the frame of broken lines, and other part is called major loop, and these two parts combine and abbreviate detection system as.If break off the gatherer branch road, major loop and furnace chamber constitute a closed loop, and furnace gas gets into major loop along Fig. 1 direction of arrow, return in the furnace chamber in the effect lower edge direction of arrow of sampling volume pump.
Two. realize the automatically continuous method for detecting cleaning degree of a plurality of sampling spots
This method may further comprise the steps:
The first step is prepared before detecting.
1) closes whole hand switch valves 4 in the automatic collection branch road earlier, a plurality of total amount of pollutant gatherers 10 are installed are then carried out with a plurality of analysis gatherers 11.
2) connect control system power supply 28; Turn on the power switch; Start computing machine 27 and controller 25; Whether system gets into automatically and detects and start preparation routine, comprise the starting state that detects refrigeration machine 19, detect the water temperature whether automatic switch valve 8 be in closed condition, detection gas sampled refrigeratory 2 and meet the demands or the like.When test item reaches requirement, the start button pilot lamp on the guidance panel 26 is bright, and the prompting that starts appears allowing in operation screen.
3) the hand switch valve 4 of detection system is all got to the position of " opening ", " start button " on the push panel 26, control system will get into the impermeability trace routine automatically, and this moment, impermeability detected state picture appearred in display.It is qualified to detect, and the impermeability pilot lamp is green, and control system changes the purging program automatically over to, and in display frame, demonstrates the purging state.Promptly use the nitrogen sparge tube road, the air in pipeline and the equipment discharged, purge accomplish after, pilot lamp changes green into, and controller 25 will cut out whole automatic switch valve 8, for sampling is prepared, this moment, picture appearred setting in display.If impermeability is defective, the impermeability pilot lamp is red, and sends the chimes of doom light signal, needs the hand inspection connecting portion whether to have leakage.Behind the intact leak point of artificial treatment, " start button " on the push panel 26 again.Repeat above-mentioned work, till impermeability is qualified.After the impermeability detection is qualified, need the closed portion manually-operated gate, like " N
2Access point a " preceding hand switch valve 4.
In second step, sampling is set.
Accomplishing sampling spot selection, gatherer selection and gas sampled amount through the keyboard on the guidance panel 26 sets.
1. according to the quantity of total amount of pollutant gatherer 10, sampling spot, sampling spot are selected in proper order, and the gas sampled amount is set.Selection and setting come into force when the quantity of total amount of pollutant gatherer 10 is greater than or equal to sampling spot quantity.Otherwise do not accept to select and set.
2. according to the quantity of analyzing gatherer 11, sampling spot, sampling spot are selected in proper order, and the gas sampled amount is set.Selection and setting come into force when the quantity of analyzing gatherer 11 is greater than or equal to sampling spot quantity.Otherwise do not accept to select and set.
The 3rd step, gas sample.
1) after completion preliminary work is set with sampling, " sampling startup " button on the push panel 26, this moment, gatherer display frame appearred in display; Controller 25 sends operating instruction to major loop, promptly opens the automatic switch valve 8 in the detection system, and gas distributor 3 is according to the Instruction Selection sampling spot of controller 25.
Middle sampling spot to be set in the furnace chamber 1 is an example:
Controller 25 is set the automatic switch valve of collecting automatically continuously on certain the preparation sampling slip in the branch road (be called for short and collect branch road automatically) to the furnace gas pollutant simultaneously 8 according to sampling and is sent OPEN; For example open the whole automatic switch valves 8 on first gatherer 10 branch roads of total amount of pollutant gatherer group, other is collected branch road automatic switch valve 8 automatically and all is in closed condition.Start sampling volume pump 15 high-temperature gas is extracted out in the annealing furnace furnace chamber 1 of pressure-fired,, the temperature of high-temperature furnace gas is reduced to below 50 ℃ through gas sampled refrigeratory 2; At this moment; Because major loop by-pass valve 8 is in open mode; The gas flow resistance is minimum, gas sampled without automatic collection branch road (although first separate branches of total amount of pollutant gatherer group is in open mode, because the filter core drag effect; Gas flows along the resistance smallest passage), return in the stove along major loop.At this moment, controller 25 is carried out the major loop trace routine, and promptly major loop is through moved greater than 1 minute continuously; The continuous detecting value that pressure detection instrument 5 and gas temperature detector 7 send controller 25 in this loop is all the time in allowed band; The expression system normally can carry out the bottom program, otherwise, will delay time and detect 5 minutes; If the furnace gas temperature and the pressure of sampling do not reach requirement, controller is with stop detection system and send sound and light alarm.
If the furnace gas temperature and the pressure of sampling reach requirement; Controller 25 sends out code to by-pass valve 8; Send to begin to measure to sampling volume pump 15 simultaneously and instruct, the closed loop that gas sampled will form through the total amount of pollutant gatherer of collecting automatically in the branch road 10 returns in the stove.Because the filtration of filter core in the total amount of pollutant gatherer 10, various particle diameters just are delayed in the total amount of pollutant gatherer 10 greater than the particle of 1 μ m in the furnace gas.When the rate of air sucked in required of sampling volume pump 15 reaches setting value; Controller 25 at first sends OPEN to by-pass valve 8; Delay time after several seconds, controller 25 will cut out the automatic switch valve 8 on the automatic collection branch road in the work, and send the information that this gatherer has been accomplished sampling; Total amount of pollutant gatherer corresponding in the gatherer display frame becomes dark color, and sampling is accomplished in expression.
Controller 25 sends the instruction of replacing sampling spot according to setting to gas distributor 3 then; After tens seconds time-delay, the furnace gas in the major loop is replaced by the new furnace gas of another one sampling spot; At this moment controller 25 is set according to sample procedure; Automatically automatic switch valve 8 from branch road to another one that collect sends OPEN, for example opens whole automatic switch valves 8 of analyzing on first branch road of gatherer group, and other automatic switch valve 8 of other gatherer branch roads all is in closed condition.At this moment, because collector unit by-pass valve 8 is in open mode, the gas flow resistance is minimum, and gas sampled is returned in the stove along major loop through bypass without the gatherer branch road.The detected value that pressure detection instrument 5 and gas temperature detector 7 send controller in major loop in 1 minute is all the time in allowed band; Controller 25 sends out code to by-pass valve 8; Send numerical value zero clearing and new metering instruction to sampling volume pump 15 simultaneously, gas sampled will be returned in the stove through first closed loop of analyzing gatherer 11 formation in the gatherer branch road.Owing to gas sampled gets in the solution of analyzing in the gatherers 11 through decollator 12, under its detention effect, pollutant is just arrived by detention and analyzes in the gatherer 11 in the furnace gas.When the rate of air sucked in required of sampling volume pump 15 reaches setting value; Controller 25 at first sends OPEN to by-pass valve 8; Delay time after several seconds, controller will cut out the automatic switch valve 8 in this gatherer branch road, and send this and analyze the information that gatherer has been accomplished sampling; The corresponding analysis gatherer of gatherer display frame becomes dark color, and this is analyzed gatherer and accomplishes sampling.
According to said method, successively other each road gatherers are accomplished sampling work.
2) volume of gas sampled calibration:
It is unit that normal cubic metre is all adopted in gas sample, and operating personnel set the gas sampled amount on guidance panel 26 be normal cubic metre, 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 are arranged, with the actual temperature and the force value of gas sampled; Through controller 25 signal is passed to computing machine 27; Computing machine calculates through the equation of gas state, gives the sampling volume pump 15 1 modified values, 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 gatherer 10 and the analysis gatherer 11; Get into the water collector that gas temperature detector 7 is housed 13 among the metering and the gas loopback person in charge through hand switch valve 4, pressure detection instrument 5; This moment, controller 25 sent the pressure and temperature signal of the gas that obtains to computing machine 27 processing, was used to revise gas flow.Then, furnace gas more successively through going into the filtrator 14 of metering in being responsible for the gas loopback, sampling volume pump 15, reverse checkvalve 9 and automatically, the hand switch valve gets into loopback gas flow dryer 16, sent back in the annealing furnace behind the furnace-heated; When the rate of air sucked in required of sampling volume pump 15 reaches setting value+modified value; Promptly accomplish the process of the volume calibration of gas sampled; Gatherer on this sampling slip is also accomplished sampling work, and controller will be opened by-pass valve 8 according to setting, closes the gatherer front and back automatic switch valve 8 of accomplishing sampling work; And control dispenser changes sampling spot, carries out the sampling process of next gatherer.When whole gatherers completion sampling work, display the gas sample completion will occur and system gets into the prompting that pipeline purges state.
In the 4th step, pipeline purges.
The purpose that system channel 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 gatherer with assurance.This purging is called security and purges, and is accomplished automatically by system.The 2nd, purge from the stove to the pipeline the cleanliness detector, to guarantee duct cleaning, improve the precision and the accuracy that detect.This purging is called spatter property and purges, and only when shutdown maintenance, utilizes the high pressure nitrogen of nitrogen station 18 supplies that purge nitrogen supply (NS) system (hereinafter referred " nitrogen purging system "), by operating personnel's control each sampling pipe is purged.
Security purges: after the detection of cleanliness detection system completion impermeability is qualified; And after the prompting of " sampling is accomplished; get into the purging state " appearred in the display in the guidance panel 26, control system will be carried out following purging program: controller 25 at first sent instruction to divider 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 hand switch valve 4, reduction 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 collection unit is opened; Therefore at first purge the detection system major loop; Nitrogen gets in the annealing furnace through major loop, and each sampling spot branch road purge time is not less than 15 seconds, reaches the by-pass valve 8 that controller behind the purge time will cut out the gatherer bypass; And purge each gatherer branch road of collecting branch road automatically in order, purging nitrogen will get in the annealing furnace through gatherer branch road formation loop.After whole purgings are accomplished, controller 25 will send instruction, close whole automatic switch valves 8 of nitrogen purging system and detection system.Guidance panel 26 shows that purging finishes.After security purges and accomplishes,, can take off total amount of pollutant gatherer 10 and analyze gatherer 11, send the analysis room to weigh and constituent analysis through opening total amount of pollutant gatherer 10 and the junction of analyzing gatherer 11, and the gatherer 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 refrigeratory 2.Operating personnel at first close whole hand switch valves 4 that 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 gas sample is responsible for, the refrigeration machine 19 in sampling volume pump 15 and the cooling system also is in closed condition.Close whole hand switch valves 4 and the " N of nitrogen purging system of sample circuit gas loopback part
2Access point b " preceding hand switch valve 4; Open " N
2Access point a " preceding hand switch valve 4, and close " N through guidance panel 26
2Access point c " preceding automatic switch valve, open the hand switch valve 4 before the reduction valve 17, manual adjustments 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 adjustment reduction valve 17, nitrogen pressure is remained on 1 ~ 2bar (between 100 ~ 200kPa).Select gas distributor 3 passages through guidance panel 26, and open " the N of nitrogen purging system
2Access point a " preceding automatic switch valve 8, can purge each sampling pipe, nitrogen is through gas distributor 3 reverse being blown in the stove.Select gas distributor 3 each passages by the same way, one by one sampling pipe is carried out spatter property and purge.
The 5th step, the concentration of pollutant and composition detection in the furnace gas.
Total amount of pollutant gatherer 10 is solid filters, and the filter core of this filtrator can for convenience detach and replacing.Before the work, need weigh to filter core, be installed in the fixed position in the gatherer 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 general assembly (TW) of this sub-sampling of sampling stove district, and this weight promptly can obtain the concentration of particle in the furnace gas divided by the volume of sampling furnace gas.
Analyzing gatherer 11 is vials that have the liquid level scale, and distilled water or other lysates are equipped with in the inside.Furnace gas evenly scatters in distilled water or the lysate through decollator 12, the furnace gas nuisance by detention, be 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 constitution check,, promptly can obtain the concentration ratio of nuisance heterogeneity in the furnace gas the assay of its nuisance composition and ratio volume divided by the furnace gas of taking a sample.Because the nuisance 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 insulation 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 gatherer.
Through above-mentioned five steps, can accomplish detection to continuous annealing furnace furnace gas cleanliness.
Three. the appraisal procedure of furnace gas pollution level.
Through discovering that nuisance has following characteristic in the stove:
1. accumulation characteristics: along with the increase of continuous production time of continuous annealing furnace, the total amount that nuisance is hoarded in stove increases.The possibility that suspension " outburst " takes place in the stove increases.As because too fast speed adjustment or the temperature variation of carrying out, the nuisance of hoarding and sticking to equipment surface in the stove is suspended again, cause local stove district pollutant levels explosion type to increase.
2. migrate attribute in the stove: nuisance 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 nuisance is smaller in ordinary production, and often this is abnormal because factors such as faulty operation or raw material surface clearness difference cause the migration distance increase.
3. nuisance component distributing relative stability: under the ordinary production situation, the nuisance component distributing is metastable in the stove.Through detecting the variation of nuisance component distributing in the stove, some problems that exist in can finding in advance to produce.
4. chemical change 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 bulky grain, bulky grain 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 cleanliness 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 cleanliness of producing the different surfaces quality grade arrive the desired value of demands of different, otherwise can't guarantee to produce in batches.
The assessment of stove internal contamination degree adopts the method for contrast to carry out usually for these reasons.
The target cleanliness are meant and produce the average index that the different brackets quality product need arrive cleanliness, promptly produce certain kind for the previous period in, the mean value of stove district cleanliness index separately.This mean value is confirmed after repeatedly producing some quality grade products.
Through each stove district furnace gas cleanliness total amount is detected, contrast target cleanliness index can directly be assessed stove internal contamination degree; And, can judge whether each stove district nuisance component distributing 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 cleanliness weight and component distributing, can confirm that current annealing furnace 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 annealing furnace preheating section; Below the furnace roller sampling spot is set up and down in bringing-up section and soaking zone; Below the furnace roller sampling spot is set up and down at the overaging entrance and exit.For newly-built galvanizing unit, below the furnace roller sampling spot is being set about the preheating section outlet of annealing furnace; Below the furnace roller sampling spot is set up and down in bringing-up section and soaking zone; At equalizer section and hot tensile strength 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.
Other backup systems that brief description is relevant with the present invention.
(1). gas cooled 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 refrigeratory 2 in the porch of cleanliness 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 dried; Avoid causing inner operating is exerted an influence; So be provided with loopback gas cooled exsiccator 16 in the exit of detection system, to reduce the dew point of loopback gas.
Gas cooled drying and cooling water recirculation system are as shown in Figure 4.Cooling water recirculation system is by pressure detection instrument 5, refrigeration machine 19, temperature detector 23, liquid level gauge 24, loopback gas flow dryer 16, and one group of board-like cooling fin 21 in the gas sampled refrigeratory 2 is formed.Fill desalted water in the gas sampled refrigeratory 2, auxiliary point can adopt artificial the interpolation perhaps directly to be connected with the desalted water pipeline of producing unit, by the 4 direct moisturizings in the water tank of gas sampled refrigeratory of hand switch valve.Furnace gas sampling is responsible for that each sampling spot is connected in (is example with three place's sampling spots) and the stove; Because the furnace gas sampling is responsible for and controlled by gas distributor; So each sampling only has the furnace gas of a sampling spot through the stainless steel coiled pipe 20 in the gas sampled refrigeratory 2, get into the furnace gas pollutant then and collect branch road continuously automatically.Send back in the stove after being responsible for entering loopback gas flow dryer 16 through metering and gas loopback at last.
Gas sampled refrigeratory 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 coiled pipes 20 of bottom half coiling; Stainless steel coiled pipe 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 refrigeratory is the cryogenic refrigeration working medium that feeds in the cooling fin from refrigeration machine 19, the water in the cooling fin cooling casing, and water cools off the high-temperature gas in the stainless steel coiled pipe 20 again.Temperature detector 23 and liquid level gauge 24 are set in the gas sampled refrigeratory, water temperature and liquid level signal are sent to controller 25, controller 25 will be according to water temperature and furnace gas temperature, the ability of adjustment refrigeration machine and the feeding of supplementing water.
Loopback gas flow dryer 16 is to utilize low temperature dewfall principle; Board-like cooling fin 21 is set in the exsiccator casing; Feed cryogenic refrigeration working medium in this cooling fin from refrigeration machine 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 exhaust apparatus that loopback gas flow dryer 16 carries; When check system restarts or changes gatherer, controller will be controlled exhaust apparatus when major loop starts the purging state, utilize purging pressure to efflux dew and ducted gas.
Above-mentioned stopple coupon hydrocooler 2 has similar device structure with loopback gas flow dryer 16, only on the temperature parameter of cooling, difference is arranged.Stopple coupon hydrocooler 2 only is cooled to 50 ℃ ~ 60 ℃ with the high-temperature furnace gas of extracting out, with the instrumentation of protection analysis of pipeline; Cooling dehumidifier 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 reduce gas dew point, influences furnace atmosphere after preventing to send back to furnace chamber.
(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 hand switch valve 4 control break-makes, after reduction 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 hand 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 hand switch valve 4 before the access point is in closed 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 hand switch valve 4 before the access point is in open mode all the time when the cleanliness 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). control system
Control system mainly is made up of guidance panel 26, computing machine 27, system power supply 28, controller 25 etc.Wherein guidance panel 26 comprises that parts such as operation keyboard, display screen, label machine, pilot lamp, audible-visual annunciator, various action buttons constitute, and are mainly used in setting, state demonstration, warning and label printing or the like.Computing machine 27 and controller 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 control system function comprises:
1. set picture--be used for sampling spot selection, gatherer selection, the setting of gas sampled amount or the like.
2. purge the state picture--the selection of gas distributor sampling pipe when the monitoring and the spatter property that are used to the state of purging purge.
3. impermeability detects picture--be used to show the impermeability detected state.
4. fault alarm display frame--be used for display system and overpressure situation whether occur in sampling process.
5. gatherer display frame--be used for each collector status demonstration and gatherer gas flow and show.
6. key frame--display system overall operation state.
7. label display frame--whole gatherer samplings finish the back display 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 gatherer: gatherer 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 gatherer.
Claims (6)
1. realize the automatically continuous method for detecting cleaning degree of a plurality of sampling spots; It is characterized in that: controller is extracted the furnace gas of each sampling spot of annealing furnace out according to setting the control major loop in order, and according to setting order and flow; Furnace gas is successively through each gatherer; Various particles just are delayed in the gatherer in the furnace gas, accomplish until whole gatherers and collect, thereby realize the realization sampling in order automatically of a plurality of gatherers; Then according to the weight difference of total amount of pollutant gatherer filter core before and after the sampling, the general assembly (TW) of each the stove district suspended particulate substance that obtains taking a sample, thus obtain the concentration of particle in each sampling stove district furnace gas; Through each stove district furnace gas cleanliness total amount being detected assessment stove internal contamination degree; Pollutant in the gatherer is delivered to Chemical Analysis Lab test, the composition of the stove district pollutant that obtains taking a sample through detection and the analysis to each stove district composition of fumes, judges whether each stove district nuisance occurs unusually;
This method be utilize a kind of mainly by the furnace gas sampling be responsible for, the furnace gas pollutant is collected branch road continuously automatically, metering is responsible for the automatic continuous cleanliness detection system of a plurality of sampling spots of forming of realization with the gas loopback and is realized that the step of this method comprises:
The first step, gas sample:
After accomplishing preliminary work and sampling setting, " sampling starts " button on the push panel, total system entering duty, its main contents comprise: controller (25) is according to setting, and the control furnace gas is taken a sample and is responsible for the conversion of accomplishing each sampling spot; Control furnace gas pollutant is collected branch road is accomplished each gatherer according to program conversion continuously automatically; The control metering is responsible for extraction, loopback and the metering of accomplishing furnace gas with the gas loopback;
Second step, to filtering after the high-temperature gas cooling of extracting out:
High-temperature gas passes gas sampled refrigeratory (2) the back temperature of extracting out is reduced to≤and 50 ℃, then through gas distributor (3), the valve on the pipeline that the furnace gas sampling is responsible for and pressure detection instrument (5) get into furnace gas pollutant collection branch road automatically continuously,
Automatically collect continuously under the filtration of filter core in the total amount of pollutant gatherer (10) in the branch road at the furnace gas pollutant, various particle diameters just are delayed in the total amount of pollutant gatherer greater than the particle of 1 μ m in the furnace gas,
After getting into the furnace gas pollutant and collecting the analysis gatherer (11) in the branch road continuously automatically, furnace gas scatters in the liquid of being adorned inside this analysis gatherer through decollator (12), and the furnace gas nuisance is dissolved, detention, be deposited in the liquid;
The 3rd step, the volume calibration of gas sampled:
Through the furnace gas behind total amount of pollutant gatherer (10) and the analysis gatherer (11); Get into the water collector that gas temperature detector (7) are housed (13) among the metering and the gas loopback person in charge through the first manual switch valve (4), pressure detection instrument (5); Controller this moment (25) sends the pressure and temperature signal of the gas that obtains to computing machine (27); Give the sampling volume pump (15) corrections after the Computer Processing; Be used to revise gas flow, guarantee to reach through amount the normal cubic metre numerical value of setting through the furnace gas of each gatherer
Then; Furnace gas gets into filtrator (14), sampling volume pump (15), first reverse checkvalve (9) and first automatic switch valve (8), the second manual switch valve (4) among the metering and the gas loopback person in charge successively; Get into loopback gas flow dryer (16), sent back in the annealing furnace behind the furnace-heated, after whole gatherers are accomplished sampling; Controller (25) cuts out sampling volume pump (15), and the prompting that sampling is accomplished and system gets into pipe safety property purging state appears in display;
The 4th step, pipe safety property purging:
After sampling was accomplished, said detection system got into security automatically and purges state:
Controller (25) at first sends instruction to gas distributor (3), closes all repid cut-off valve (22) automatically, opens the automatic switch valve (8) of all branch roads; The nitrogen that is higher than furnace pressure purges through the pipeline that the 3rd hand switch valve (4), reduction valve (17), second reverse checkvalve (9), the second pressure detection instrument (5), the 3rd automatic switch valve (8) get into all branch roads from unit pipe network or nitrogen station (18); Purge is that controller (25) is according to the purging program; Control furnace gas pollutant is collected first automatic switch valve (8) that branch road, metering and gas loopback are responsible for continuously automatically; Each branch road is purged in order; Each bypass line purge time >=15 second purge nitrogen and are responsible for the gas loopback through metering and feed in the stove
After purging completion, controller (25) sends instruction, and whole automatic switch valves (8) are closed, and purging appears in display accomplishes, and the prompting of changing or taking off total amount of pollutant gatherer (10), analysis gatherer (11);
The 5th step, the concentration of particle and composition detection in the furnace gas:
The detection of particle concentration in the furnace gas: the filter core of total amount of pollutant gatherer (10) is taken out; Be placed on the balance and weigh; The weight difference that the filter core of total amount of pollutant gatherer was weighed before this was weighed and takes a sample is the general assembly (TW) of this sub-sampling of sampling stove district; This weight obtains the concentration of particle in the furnace gas divided by the volume of sampling furnace gas
The detection of pollutant component in the furnace gas: analyzing gatherer (11) is a vial that has the liquid level scale; After gas sample finishes; The vial that liquid is housed taken off send the chemical analysis chamber to carry out chemical constitution check; With the assay of nuisance composition and ratio in the liquid volume, promptly obtain the concentration ratio of nuisance heterogeneity in the furnace gas divided by the sampling furnace gas;
Through above-mentioned five steps, realize detection to continuous annealing furnace furnace gas cleanliness.
2. the automatically continuous method for detecting cleaning degree of a plurality of sampling spots of realization according to claim 1 is characterized in that the described preliminary work of the first step may further comprise the steps:
The first step is closed the manual switch valve of first in the gatherer branch road (4) earlier, total amount of pollutant gatherer (10) is installed then and is analyzed gatherer (11);
Second step; Start computing machine (27) and controller (25); Control system gets into automatically and detects and start preparation routine, comprises the starting state that detects refrigeration machine (19), detects whether automatic switch valve (8) is in closed condition, whether the water temperature that detects gas sampled refrigeratory (2) meets the demands; When test item reaches requirement, " start button " pilot lamp on the guidance panel is bright, and the prompting that starts appears allowing in display;
The 3rd step, the hand switch valve (4) of detection system is all got to the position of " opening ", press " start button ", system will get into the impermeability trace routine automatically; Impermeability detected state picture appears in the display of guidance panel this moment (26), if detection is qualified, the impermeability pilot lamp is green; Control system changes the purging program automatically over to, and in display frame, demonstrates the purging state, uses the nitrogen purging pipeline that is:; Air in pipeline and the equipment is discharged, and after purging was accomplished, pilot lamp changed green into; And controller (25) will cut out whole automatic switch valve (8), and for sampling is prepared, this moment, picture appearred setting in display; If impermeability is defective, the impermeability pilot lamp is red, and sends the chimes of doom light signal, needs the hand inspection connecting portion whether to have leakage, behind the intact leak point of artificial treatment, must press " start button " again.
3. the automatically continuous method for detecting cleaning degree of a plurality of sampling spots of realization according to claim 1; It is characterized in that it is to accomplish sampling spot selection, gatherer selection and gas sampled amount through the keyboard on the guidance panel (26) to set that the described sampling of the first step is set, specifically is to carry out according to following method:
A. according to the quantity of total amount of pollutant gatherer (10), sampling spot, sampling spot are selected in proper order, and the gas sampled amount is set; Selection and setting come into force when the quantity of total amount of pollutant gatherer (10) is greater than or equal to sampling spot quantity, otherwise controller (25) is not accepted to select and set;
B. according to the quantity of analyzing gatherer (11), sampling spot, sampling spot are selected in proper order, and the gas sampled amount is set; Selection and setting come into force when the quantity of analyzing gatherer (11) is greater than or equal to sampling spot quantity, otherwise controller (25) is not accepted to select and set.
4. the automatically continuous method for detecting cleaning degree of a plurality of sampling spots of realization according to claim 1; It is characterized in that the described setting of the first step is to be accomplished on the keyboard of guidance panel (26) by operating personnel; Specifically: according to the quantity of total amount of pollutant gatherer (10); Sampling spot, sampling spot are selected in proper order, and the gas sampled amount is set; Selection and setting come into force when the quantity of total amount of pollutant gatherer (10) is greater than or equal to sampling spot quantity, otherwise do not accept to select and set.
5. the automatically continuous method for detecting cleaning degree of a plurality of sampling spots of realization according to claim 1; It is characterized in that the described setting of the first step is to be accomplished on the keyboard of guidance panel (26) by operating personnel; Specifically: according to the quantity of analyzing gatherer (11); Sampling spot, sampling spot are selected in proper order, and the gas sampled amount is set; Selection and setting come into force when the quantity of analyzing gatherer (11) is greater than or equal to sampling spot quantity, otherwise do not accept to select and set.
6. the automatically continuous method for detecting cleaning degree of a plurality of sampling spots of realization according to claim 1 is characterized in that said pipeline of the 4th step purges further comprising the steps of:
During shutdown maintenance, need carry out the spatter property purging to the pipeline of putting from furnace inner sampling between the gas sampled refrigeratory (2):
Operating personnel at first close hand switch valve (4) and the automatic switch valve (8) that the furnace gas sampling person in charge and metering and gas loopback are responsible for; Open the nitrogen purging system again; Through purge the high pressure purging branch road of design specially for spatter property; Promptly through with gas distributor (3) connecting tube on hand switch valve (4) and manual adjustments reduction valve (17) to improve pipeline pressure, select gas distributor (3) passage through the keyboard on the guidance panel (26) then, and open the automatic switch valve (8) in the purging system; Can carry out the spatter property purging to the pipeline of putting from furnace inner sampling between the gas sampled refrigeratory
After spatter property purges and to finish, purge nitrogen and be blown in the furnace chamber (1) through gas sampled refrigeratory (2) is reverse through gas distributor (3).
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| CN86107696A (en) * | 1986-11-08 | 1988-02-24 | 武汉钢铁公司 | The preventing clogging up device of ash-laden gas sampling system |
| CN1069905A (en) * | 1992-05-19 | 1993-03-17 | 许吉录 | Purifying method for boiler fume and equipment thereof |
| EP0979314B1 (en) * | 1997-04-28 | 2001-12-05 | Tiberiu Kaszas | Process and device for recovering raw materials from waste and residues |
| CN101260472A (en) * | 2008-04-21 | 2008-09-10 | 中南大学 | Method and system for separating dust of different components in stainless steel smelting process |
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2010
- 2010-08-31 CN CN2010102683103A patent/CN101988888B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86107696A (en) * | 1986-11-08 | 1988-02-24 | 武汉钢铁公司 | The preventing clogging up device of ash-laden gas sampling system |
| CN1069905A (en) * | 1992-05-19 | 1993-03-17 | 许吉录 | Purifying method for boiler fume and equipment thereof |
| EP0979314B1 (en) * | 1997-04-28 | 2001-12-05 | Tiberiu Kaszas | Process and device for recovering raw materials from waste and residues |
| CN101260472A (en) * | 2008-04-21 | 2008-09-10 | 中南大学 | Method and system for separating dust of different components in stainless steel smelting process |
Non-Patent Citations (1)
| Title |
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| 张卫东.高炉炉身煤气自动取样及成分分析系统在攀钢1号高炉上的应用.《钢铁》.1992,第27卷(第8期),全文. * |
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| CN101988888A (en) | 2011-03-23 |
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