CN1014327B - Control method for lowering temp. of blast-furnace gas - Google Patents
Control method for lowering temp. of blast-furnace gasInfo
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- CN1014327B CN1014327B CN 88107923 CN88107923A CN1014327B CN 1014327 B CN1014327 B CN 1014327B CN 88107923 CN88107923 CN 88107923 CN 88107923 A CN88107923 A CN 88107923A CN 1014327 B CN1014327 B CN 1014327B
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- temperature
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- Blast Furnaces (AREA)
Abstract
The present invention relates to a control method for lowering the temperature of blast furnace gas, which is especially suitable for controlling the temperature drop of the blast furnace during the dry type cloth bag dust removal of the blast furnace gas. In the control method, the entrance of the dry type dust removal is used as a temperature controlling point; simultaneously, the tog gas temperature of a blast furnace, and the variation rate thereof, the temperature of the dry type dust removal entrance, the temperature setting value of the dry dust removal entrance, the system environment temperature and the variation of gas flow quantity are considered; after calculation of a microcomputer, the water jet quantity of the nozzle arranged in a gravity dust remover is controlled. The present invention also provides a new arrangement mode of the nozzle so as to guarantee that the system of the used temperature control method has accuracy, reliability, sensitive response and rapid temperature drop.
Description
The invention discloses a kind of blast furnace gas control method for lowering temp, belong to blast furnace control of dust control techniques and the regulation technology field that is cleaned gas.Gas decreasing temperature and increasing humidity control when coal gas cooling control when the present invention is specially adapted to the dedusting of blast furnace gas dry bag-type and dry electric precipitation also is applicable to dry gas cleaning, cooling, humidification control in the industry such as non-ferrous metal metallurgy, cement.
Because the top gas temperature variation is very big, big-and-middle-sized blast furnace is generally 300 ℃～400 ℃ when using hot ore deposit, when using cold ore deposit is 150 °～250 °, when blast furnace unusual during as pipeline trip, temperature can reach 700 ℃, though at present in the dry bag-type dust-removal system applied high temperature resistant best glass fibre cloth bag (250 °～300 °) also very easily burnt out.Blast furnace gas shows the temperature height in the dry electric precipitation system, and humidity is minimum, and is bigger than resistance, is unfavorable for dedusting.The dry bag-type dedusting is more economical uses in blast furnace is produced effectively in order to make, and better way is by being arranged on the nozzle atomized water spray in the blast furnace furnace roof or in the gravitational precipitator usually, water smoke heat absorption evaporation and make the coal gas cooling.Produce the control method of controlling blast furnace gas temperature by the controlled liq emitted dose thus, thereby particularly by measuring the feedback of blast furnace gas temperature and flow control spouting of liquid amount control blast furnace gas temperature.But all there is certain defective in present existing feedback, opening clear 57-161010, spy as Japanese kokai publication sho 57-164903, spy opens clear 57-161008, spy and opens clear 57-161011, spy and open clear 57-161009 and spy and open that disclosed blast furnace gas control method all is that temperature control point is fixed on the dry gas cleaning exit in the clear 57-174404 patent documentation, soon dry gas cleaning exit temperature detection signal and the desired temperature at this place compare, and its deviation signal is controlled liq emitted dose behind flux modification generally.Because the volume of dry bag-type dust remover is very big, temperature variation to the dry gas cleaning ingress has the absorption shock absorption, the size of ingress temperature variation is several times of exit and the problem that lags behind if having time, because the ingress temperature variation can not reflect in the exit timely and accurately, therefore the dry gas cleaning temperature in can't be accurately controlled according to dry gas cleaning temperature out detection signal control atomized water spray amount, too high cloth bag or the excessively low dewfall phenomenon of burning out of temperature in must be occurred.For above-mentioned reasons, burn out cloth bag when increasing for preventing that the top gas temperature is anxious, above-mentioned 6 Japanese Patents have openly all adopted feed forward control method, promptly according to top gas temperature detection signal or its signal differential through time lag or through the gas flow correction gas temperature is controlled in advance again.Because these feed forward control methods have only considered that all the throat temperature changing conditions is an aspect of value or trend, so the feed forward control effect is undesirable, thereby have influence on the susceptibility and the accuracy of The whole control system.Taiyuan Iron and Steel Co. 1200m as China's introduction
3Furnace cloth bag dust-removing just adopts above-mentioned control method, and its bag-type dust temperature in fluctuation range is ± 38 ℃, is still spraying a part of water in the time need not spraying water.The Japanese Patent spy opens clear 57-174404 and has not only adopted above-mentioned feedforward and dry gas cleaning outlet temperature control feedback, but also gravitational dust collection exit temperature detection signal is carried out the differential value, temperature increase and decrease speed with this point is that temperature changing trend is controlled injection flow rate, to prevent owing to causing the time lag of temperature controlling point the dry gas cleaning temperature in to rise spray cooling in time, when descending, temperature too cools off again.But only participating in injection flow rate control with gravitational dust collection temperature out variation tendency still can not control the dry gas cleaning temperature in sensitive and accurately and also can make temperature control system produce vibration and out of control.In addition, all do not have in the existing blast furnace gas temperature control method to consider from the blast furnace furnace roof to the heat dissipation capacity the gravitational precipitator exit passageway, more this heat dissipation capacity participation control computing.As large pipeline, long distance and the great situation of variation of ambient temperature, heat dissipation capacity is very important for the gas temperature that accurate control enters dry collector.Usually, radiating and cooling can reach 70～100 °, considers that this point just can guarantee the long-term accuracy of temperature controlling system.Except that control method, all setting of its nozzle in gravitational precipitator or blast furnace furnace roof that utilizes atomized water spray to carry out the coal gas cooling are horizontal direction, and promptly the atomized water spray direction is vertical with air flow line.One of its shortcoming is that volumetric heat transfer coefficient is little, and evaporation time is long, and cooling rate is slow; Another shortcoming is when nozzle water spray range is long, its water smoke is not also just run on the shell of tank before the evaporation fully, and portion water can not be evaporated immediately, causes minimum injection flow rate excessive, make the detection signal of temperature control system unfounded, thereby reduced the susceptibility and the accuracy of temperature controlling system.
Purpose of the present invention is intended to improve according to the decoration form of the problems referred to above to existing blast furnace gas temperature control method and cooling liquid jet, to be controlled at certain limit be below the top temperature that allowed of filter bag to obtain gas temperature that a kind of energy will enter bag dust collector, the arbitrary temp interval that the coal gas dew point is above, to guarantee the filter bag works better of some material, prolong its work-ing life also accurately and reliably for a long time, be quick on the draw, the temperature-controlled process that cooling rate is fast, and make the water smoke volumetric heat transfer coefficient of injection big, evaporation is complete and the time is short, the nozzle placement mode that cooling rate is fast is to guarantee temperature control system accuracy height, susceptibility is good.
For achieving the above object, the present invention is achieved in that and detects blast furnace furnace roof, dry gas cleaning inlet gas temperature and environment of system temperature, detect the gas flow in dry gas cleaning exit simultaneously, enter the mouth gas temperature detection signal and this place's desired temperature of dry gas cleaning compared, and its deviation signal is through PID(pid calculation device) output temperature control deviation injection flow rate signal after the computing;
To influence from the blast furnace furnace roof to gravitational dust collection the significant parameter-environment of system temperature detection signal of passage scatterer outlet in addition, dry gas cleaning inlet gas temperature detection signal and this place's desired temperature, ejecting mouthful gas temperature detection signal and signal differential thereof through the State of Blast Furnace of computing time lag together is input to and carries out computing in the totalizer, its additive signal enters the back output of multiplying each other of multiplier and gas flow detection signal again and calculates the injection flow rate signal, thus with above-mentioned deviation injection flow rate signal with calculate the injection flow rate signal and add the aperture control injection flow rate of together controlling water regulating valve.The adjustable return water jet nozzle that is inwardly sprayed by the periphery around evenly being arranged on simultaneously in gravitational precipitator or the blast furnace furnace roof makes the flow direction of spouting of liquid direction and blast furnace gas be angle less than 90 °.
Compared with prior art, the dry gas cleaning inlet gas temperature that the present invention enters the dry collector gas temperature owing to handle can truly reflect is as the temperature control point of dry gas cleaning, and carry out control atomized water spray amount after the comprehensive computing to this place's temperature signal and with set(ting)value deviation signal, blast furnace furnace roof temperature detection signal and signal differential thereof, system radiating amount and gas flow, can keep therefore that long-term temperature precise control is reliable, system response is sensitive, cooling rate is fast.In addition, because the new set-up mode of nozzle, spouting of liquid direction and air flow line are the angle less than 90 °, produce the water smoke component motion consistent thus with the flow of gas direction, increased the touch opportunity of droplet and coal gas, made the water smoke volumetric heat transfer coefficient of injection big, evaporation is complete and the time is short, cooling rate is fast, provides foundation for realizing above-mentioned temperature control method better.
Accompanying drawing is blast furnace gas control method for lowering temp embodiment.
Below in conjunction with the embodiment accompanying drawing the present invention is done further more detailed description:
As shown in the figure, top gas is discharged after gravitational precipitator 2 and dry bag-type dust remover 3 dedustings.Nozzle 4 is housed in the gravitational precipitator, and this nozzle is supplied water by motor 5 driving pumps 6, and its atomized water spray amount is by variable valve 7 controls.The inlet of dry collector 3 is established thermometer 10, its detected temperature T
2Signal subtracts each other with desired temperature SP in thermoswitch 16, and its deviation signal is through PID computing output and as the input of totalizer 19.Blast furnace 1 furnace roof is established thermometer 9, its detected temperature T
1Signal and this signal together are input in the totalizer 14 through the temperature increase and decrease speed of differentiator 13 computings output, its additive signal is input in the totalizer 17 through pure hysteresis arithmetical unit 15, and with the detection signal addition of desired temperature SP, thermometer 10 and thermometer 12, operation result inputs in the multiplier 18 and the under meter 11 detected gas flow F that establish in the dry gas cleaning exit
2Signal multiplication is taken advantage of and is calculated the input of result as totalizer 19, and wherein thermometer 12 is arranged on and is used for detection system envrionment temperature T in the environment of system atmosphere
3The output of thermoswitch 16 and multiplier 18 exports the aperture of water regulator 20 regulating and controlling valves 7 to through totalizer 19 additive operations.
Work as temperature T
1During rising, differentiator 13 is input to its temperature rise rate and temperature value in the pure hysteresis arithmetical unit 15 with totalizer 14, pure hysteresis arithmetical unit 15 compensation coal gas export to retardation time of gravitational precipitator 2 by blast furnace 1 furnace roof, export multiplier 18 to by totalizer 17 COMPREHENSIVE CALCULATING again, through gas flow F
2Take advantage of after calculating and become the size and the rate-controlling signal that increases injection flow rate that needs to increase injection flow rate by totalizer 19, aperture reduced when the coal gas when through water regulator 20 variable valve 7 being raise under temperature again arrived gravitational precipitator 2, injection flow rate increases, and gas temperature is lowered.Otherwise, temperature T
1Then opposite during decline with above-mentioned effect, feed forward control process that Here it is.
When feedforward control fails to make the gas temperature that enters dry collector 3 to drop to the desired temperature SP of requirement, just show temperature T
2Raise temperature T
2Detection signal input in the thermoswitch 16 with set(ting)value SP relatively, its deviation signal through PID computing output through totalizer 19 to water regulator 20, regulating and controlling valve 7 further reduces aperture, injection flow rate increases.Otherwise, if feedforward control action makes temperature T
2Cross when low then on the contrary, regulating and controlling valve 7 is increased apertures, injection flow rate is reduced, Here it is feedback control procedure with above-mentioned effect.
When the blast furnace gas fluctuations in discharge, then by the size of multiplier 18 corrected Calculation injection flow rates, change the aperture of variable valve 7 again through totalizer 19 to water regulator 20, make the injection flow rate size adapt to the variation of gas flow.
Along with the environment of system temperature T
3Variation, from blast furnace 1 furnace roof to dry collector 3 the inlet pipe heat dissipation will change, in totalizer 17, introduce temperature T
3Detection signal is with the size of corrected Calculation injection flow rate signal.
Dry gas cleaning temperature in set(ting)value SP sets the requirement of temperature in according to different dry collectors, after dry collector 3 temperature in set(ting)value SP change, making the required injection flow rate of coal gas amount promptly calculate injection flow rate by totalizer 17 on the one hand changes, through thermoswitch the deviation injection flow rate is changed on the other hand.
In addition, adjustable return water jet nozzle around evenly being arranged in gravitational precipitator or the blast furnace furnace roof, the flow direction of its atomizing of liquids direction and blast furnace gas is the angle less than 90 °, is generally 30 °～70 °, and occurrence is decided according to the structure of its installation site and installation container.
Claims (2)
1, a kind of blast furnace gas control method for lowering temp, comprise that detection signal according to top gas temperature and dry gas cleaning exit gas flow is controlled at from the blast furnace furnace roof to the gas flue the dry gas cleaning or the spouting of liquid amount of the nozzle that is provided with in the gravitational precipitator, control with this cooling blast furnace gas, it is characterized in that enter the mouth gas temperature detection signal and this place's desired temperature of dry gas cleaning compared, its deviation signal is exported temperature control deviation injection flow rate signal after PID (pid calculation device) computing, to influence significant parameter-environment of system temperature detection signal in addition from the blast furnace furnace roof to gravitational dust collection exit passageway heat dissipation capacity, dry gas cleaning inlet gas temperature detection signal and this place's desired temperature, State of Blast Furnace through computing time lag ejects mouthful a coal gas detection signal and a signal differential thereof, together be input to and carry out computing in the totalizer, its additive signal enters the back output of multiplying each other of multiplier and gas flow detection signal again and calculates the injection flow rate signal, above-mentioned deviation injection flow rate signal and calculating injection flow rate signal are added the aperture of together controlling water regulating valve, thus the control injection flow rate.
2, according to the control method for lowering temp of blast furnace gas described in the claim 1, it is characterized in that: the wherein said layout that is arranged on the nozzle in the gravitational precipitator makes the flow direction of spouting of liquid direction and blast furnace gas be angle less than 90 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88107923 CN1014327B (en) | 1988-11-23 | 1988-11-23 | Control method for lowering temp. of blast-furnace gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88107923 CN1014327B (en) | 1988-11-23 | 1988-11-23 | Control method for lowering temp. of blast-furnace gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1037541A CN1037541A (en) | 1989-11-29 |
| CN1014327B true CN1014327B (en) | 1991-10-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88107923 Expired CN1014327B (en) | 1988-11-23 | 1988-11-23 | Control method for lowering temp. of blast-furnace gas |
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| Country | Link |
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| CN (1) | CN1014327B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU91617B1 (en) * | 2009-10-19 | 2011-04-20 | Wurth Paul Sa | Energy recovery from gases in a blast furnace plant |
| CN102827993B (en) * | 2011-06-17 | 2016-02-24 | 山东省冶金设计院股份有限公司 | Inject the recovery method of combustion type coal gas of converter and converter gas sensible heat |
| CN102827991B (en) * | 2011-06-17 | 2016-06-08 | 山东省冶金设计院股份有限公司 | The recovery method of coal gas of converter |
| CN102827992A (en) * | 2011-06-17 | 2012-12-19 | 山东省冶金设计院股份有限公司 | Converter flue gas energy recovery method |
| CN103320563B (en) * | 2013-06-14 | 2015-09-02 | 上海宝锋工程技术有限公司 | A kind of COREX shaft furnace stock gas treatment system and treatment process thereof |
| CN103866067A (en) * | 2014-03-04 | 2014-06-18 | 中冶南方工程技术有限公司 | Blast furnace coal gas gravitational dust collector with cooling effect |
| CN106566903A (en) * | 2015-10-10 | 2017-04-19 | 宝钢工程技术集团有限公司 | Temperature control device for COREX furnace gas and use method thereof |
| EP3159640B1 (en) | 2015-10-20 | 2020-04-01 | Danieli Corus BV | Cleaning furnace gas process and metal production plant |
| CN108480042B (en) * | 2018-03-08 | 2021-01-26 | 马鞍山钢铁股份有限公司 | Flue gas dust removal device and dust removal process thereof |
| CN109439821B (en) * | 2018-12-25 | 2021-01-05 | 中冶南方工程技术有限公司 | Blast furnace top gas bleeding system |
| CN112674689B (en) * | 2020-12-07 | 2022-05-20 | 珠海格力电器股份有限公司 | Disinfection method, control device, cleaning method, and storage medium |
| CN112941259A (en) * | 2021-04-08 | 2021-06-11 | 中冶南方工程技术有限公司 | Blast furnace top pressure-equalizing gas purification and recovery device and process |
-
1988
- 1988-11-23 CN CN 88107923 patent/CN1014327B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1037541A (en) | 1989-11-29 |
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