CN103589822A - Control method for outlet temperature of evaporative cooler used in dry converter dedusting - Google Patents
Control method for outlet temperature of evaporative cooler used in dry converter dedusting Download PDFInfo
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- CN103589822A CN103589822A CN201310630436.4A CN201310630436A CN103589822A CN 103589822 A CN103589822 A CN 103589822A CN 201310630436 A CN201310630436 A CN 201310630436A CN 103589822 A CN103589822 A CN 103589822A
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- evaporative cooler
- atomizing medium
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- flue gas
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Abstract
The invention discloses a control method for the outlet temperature of an evaporative cooler used in dry converter dedusting, which belongs to the technical field of dry converter dedusting. The control method realizes controlling of outlet flue gas temperature by controlling cooling water flow, water distribution pressure and atomizing medium pressure according to changes of flue gas temperature in different converting procedures. The control method comprises the following steps that: when top blowing of oxygen at a converter begins, an atomizing medium cut-off valve is opened; water distribution is not carried out when inlet flue gas temperature T1 is less than 350 DEG C; when T1 is no less than 350 DEG C, a water supply cut-off valve, a water supply flow regulating valve and an atomizing medium pressure regulating valve are opened to allow cooling water flow to be 24 to 27 m<3>/h, water distribution pressure to be 1.1 to 1.4 MPa and atomizing medium pressure to be 0.93 to 0.98 MPa; and when top blowing of oxygen at the converter ends and T1 is less than 350 DEG C, the water supply cut-off valve and the atomizing medium cut-off valve are closed. The method provided by the invention has the advantages of a simple and easily practicable control scheme, accuracy, reliability, effective improvement of flue gas purifying efficiency, capacity of allowing flue gas content to be no more than 10 mg/Nm<3> after dedusting, reduction in resistance loss of a system, decrease of water consumption of the system and good popularization and application values.
Description
Technical field
The invention belongs to converter dry dedusting technology field, be specifically related to a kind of control method of efficient, accurate converter dry dedusting outlet temperature for evaporation cooler.
Background technology
Converter dry dust collecting process is that the flue gas that converter in smelting process is produced imports evaporative cooler after gasification cooling flue is cooled to 800 ~ 1000 ℃, system accurately controls according to the heat content of converter gas the tuyere arrangement that evaporative cooler top arranges, with atomizing medium, will after the complete atomization of water, fully mix with flue gas, make flue gas be cooled to 200 ℃ of left and right.Now, approximately there is 50% meal dirt to be deposited to the banana crook of evaporative cooler outlet, and deliver to ash silo by devices such as chain type cinder conveyer, ash buckets.Cooled flue gas enters electrostatic precipitator through the pipe connecting between evaporative cooler and electrostatic precipitator, then after electrostatic precipitation is processed, dust content is down to 10mg/Nm
3below.
If the flue-gas temperature of evaporative cooler outlet, higher than 350 ℃, can have influence on the life-span of electrostatic precipitator, will not allow converter gas to enter electrostatic precipitator, converter just can not normally be produced.If the flue-gas temperature of evaporative cooler outlet is lower than 150 ℃, water vapour contained in flue gas can condense, and it is wet that meal dirt can become in settling process, not only produces sposh, and affect the normal use of electrostatic precipitator.Therefore, it is one of core technology of converter dry dust-removal system that the temperature of evaporative cooler outlet is controlled technique, research and develop a kind of efficient, accurate outlet temperature for evaporation cooler control method, the dust removing effects and the coal-gas recovering rate that are not only related to system, and be related to the normal production of converter, be of great practical significance and application value.
Summary of the invention
The object of the present invention is to provide a kind of control method of efficient, accurate converter dry dedusting outlet temperature for evaporation cooler.
The object of the present invention is achieved like this: a kind of control method of converter dry dedusting outlet temperature for evaporation cooler, it is according to the variation of flue-gas temperature in different blowing process, by controlling cooling water flow, water distribution pressure and atomizing medium pressure, realize the control of evaporative cooler exit gas temperature, specifically comprise:
A, when converter oxygen top blown starts, the atomizing medium trip valve of evaporative cooler is opened automatically;
B, in the process of bessemerizing, as the entrance flue gas temperature T of evaporative cooler
1during 350 ℃ of <, not water distribution; T
1in the time of>=350 ℃, the feedwater trip valve of evaporative cooler is opened automatically, and adjusts feed water flow regulating valve and atomizing medium pressure regulator valve, and control cooling water flow is 24 ~ 27m
3/ h, water distribution pressure 1.1 ~ 1.4MPa, atomizing medium pressure 0.93 ~ 0.98MPa;
C, finish the entrance flue gas temperature T of evaporative cooler when converter oxygen top blown
1during 350 ℃ of <, feedwater trip valve, atomizing medium trip valve are closed successively automatically.
The method of the invention can realize efficiently, accurately controlling of converter dry dedusting evaporative cooler exit gas temperature, make exit gas temperature be down to 200 ℃ of left and right, not only can make the thick efficiency of dust collection of evaporative cooler reach the highest, regulated and controled the moisture content of flue dust simultaneously, make electrostatic precipitator obtain optimum ratio resistance on the one hand, improved greatly the efficiency of electrostatic precipitation, make on the other hand the humidity of cinder storehouse, thin ash silo dust still keep relatively low standard, thereby there is good fluidisation, effectively reduce system resistance and damage.Adopt exit gas temperature control method of the present invention, dustiness≤the 10mg/Nm3 of flue gas after dedusting, it is only 1/10th of country's permission emission standard, purification efficiency is high, and control program is simple and easy to do, accurately reliable, effectively reduce system water loss, be conducive to the raising of Business Economic Benefit, there is good application value.
Accompanying drawing explanation
Fig. 1 is evaporative cooler flue-gas controlling system structure iron;
In figure, 1-evaporative cooler inlet flue gas, 2-detector unit, 3-feed water flow regulating valve, 4-feedwater trip valve, 5-atomizing medium pressure regulator valve, 6-atomizing medium trip valve, 7-evaporative cooler body, 8-banana-bends, 9-thick defeated grey chain, 10-detector unit, 11-evaporative cooler outlet flue gas, 12-meal dirt.
Embodiment
Below the present invention is further illustrated, but never in any form the present invention is limited, any conversion of doing based on training centre of the present invention, the present invention all falls into protection scope of the present invention.
A kind of control method of converter dry dedusting outlet temperature for evaporation cooler, it is according to the variation of flue-gas temperature in different blowing process, by controlling cooling water flow, water distribution pressure and atomizing medium pressure, realize the control of evaporative cooler exit gas temperature, specifically comprise:
A, when converter oxygen top blown starts, the atomizing medium trip valve of evaporative cooler is opened automatically;
B, in the process of bessemerizing, as the entrance flue gas temperature T of evaporative cooler
1during 350 ℃ of <, not water distribution; T
1in the time of>=350 ℃, the feedwater trip valve of evaporative cooler is opened automatically, and adjusts feed water flow regulating valve and atomizing medium pressure regulator valve, and control cooling water flow is 24 ~ 27m
3/ h, water distribution pressure 1.1 ~ 1.4MPa, atomizing medium pressure 0.93 ~ 0.98MPa;
C, finish the entrance flue gas temperature T of evaporative cooler when converter oxygen top blown
1during 350 ℃ of <, feedwater trip valve, atomizing medium trip valve are closed successively automatically.
Described atomizing medium is steam.
Described bessemerizing in process, as the entrance flue gas temperature T of evaporative cooler
1in the time of>=350 ℃, the feedwater trip valve of evaporative cooler is opened automatically, stable water spray 16 ~ 24s under the aperture of feed water flow regulating valve 45 ~ 55%, and then FIC controller starts ratio, integral control, after a control cycle, TIC controller starts ratio, integral control.
Described bessemerizing in process, as the entrance flue gas temperature T of evaporative cooler
1in the time of>=350 ℃, the feedwater trip valve of evaporative cooler is opened automatically, preferably stable water spray 20s, then FIC controller startup ratio, integral control under the aperture of feed water flow regulating valve 50%, after a control cycle, TIC controller starts ratio, integral control.
Described converter oxygen top blown finishes, the entrance flue gas temperature T of evaporative cooler
1during 350 ℃ of <, feedwater trip valve cuts out automatically, and the output of FIC controller remains on 45 ~ 55%, and feedwater trip valve cuts out and within 26 ~ 34 seconds, automatically cuts out afterwards atomizing medium trip valve.
Described converter oxygen top blown finishes, the entrance flue gas temperature T of evaporative cooler
1during 350 ℃ of <, feedwater trip valve cuts out automatically, and preferably the output of FIC controller remains on 50%, and feedwater trip valve cuts out and within 30 seconds, automatically cuts out afterwards atomizing medium trip valve.
Described bessemerizing in process, when the entrance flue gas temperature of evaporative cooler is 350≤T
1during 360 ℃ of <, the feedwater trip valve of evaporative cooler is opened automatically, and adjusts feed water flow regulating valve and atomizing medium pressure regulator valve, and preferably cooling water flow is 24 ~ 25m
3/ h, water distribution pressure 1.1 ~ 1.2MPa, atomizing medium pressure 0.93 ~ 0.95MPa.
Described bessemerizing in process, when the entrance flue gas temperature of evaporative cooler is 360≤T
1during 370 ℃ of <, the feedwater trip valve of evaporative cooler is opened automatically, and adjusts feed water flow regulating valve and atomizing medium pressure regulator valve, and preferably cooling water flow is 25 ~ 26m
3/ h, water distribution pressure 1.2 ~ 1.3MPa, atomizing medium pressure 0.95 ~ 0.96MPa.
Described bessemerizing in process, when the entrance flue gas temperature of evaporative cooler is 370≤T
1during 380 ℃ of <, the feedwater trip valve of evaporative cooler is opened automatically, and adjusts feed water flow regulating valve and atomizing medium pressure regulator valve, and preferably cooling water flow is 26 ~ 27m
3/ h, water distribution pressure 1.3 ~ 1.4MPa, atomizing medium pressure 0.96 ~ 0.98MPa.
The temperature of described evaporative cooler outlet flue gas is 180≤T
2≤ 220 ℃.
A, when converter oxygen top blown starts, the steam stop valve of evaporative cooler is automatically opened and is carried out differential pressure spraying compensation, the detector unit that is connected in evaporative cooler ingress detects in real time to entering the flue-gas temperature of evaporative cooler, and signal input control system is calculated.
B, in the process of bessemerizing, as the entrance flue gas temperature T of evaporative cooler
1during 350 ℃ of <, not water distribution.
As 350≤T
1during 360 ℃ of <, the feedwater trip valve of evaporative cooler is opened automatically, and adjusts feed water flow regulating valve and vapor pressure variable valve, and control cooling water flow is 24 ~ 25m
3/ h, water distribution pressure 1.1 ~ 1.2MPa, vapor pressure 0.93 ~ 0.95MPa.
As 360≤T
1during 370 ℃ of <, control cooling water flow is 25 ~ 26m
3/ h, water distribution pressure 1.2 ~ 1.3MPa, vapor pressure 0.95 ~ 0.96MPa.
As 370≤T
1during 380 ℃ of <, control cooling water flow is 26 ~ 27m
3/ h, water distribution pressure 1.3 ~ 1.4MPa, vapor pressure 0.96 ~ 0.98MPa.
The detector unit connecting through evaporative cooler exit through the thick dedusting flue gas of decreasing temperature and increasing humidity detect qualified after, enter electrostatic precipitator and carry out next step dust separation, the macrobead meal dirt that transpiration cooling obtains is deposited to evaporative cooler outlet banana crook, by thick defeated grey chain, is delivered to ash-storing bin.
C, finish the entrance flue gas temperature T of evaporative cooler when converter oxygen top blown
1during 350 ℃ of <, feedwater trip valve, steam stop valve are closed successively automatically.
A, when converter oxygen top blown starts, the trip valve of evaporative cooler is automatically opened and is carried out differential pressure spraying compensation, the detector unit that is connected in evaporative cooler ingress detects in real time to entering the flue-gas temperature of evaporative cooler, and signal input control system is calculated.
B, in the process of bessemerizing, as the entrance flue gas temperature T of evaporative cooler
1during 350 ℃ of <, not water distribution.
As 350≤T
1during 360 ℃ of <, the feedwater trip valve of evaporative cooler is opened automatically, and adjusts feed water flow regulating valve and pressure regulator valve, and control cooling water flow is 24 ~ 25m
3/ h, water distribution pressure 1.1 ~ 1.2MPa, vapor pressure is 0.93 ~ 0.94MPa.
As 360≤T
1during 370 ℃ of <, control cooling water flow is 25 ~ 26m
3/ h, water distribution pressure 1.2 ~ 1.3MPa, vapor pressure is 0.94 ~ 0.97MPa.
As 370≤T
1during 380 ℃ of <, control cooling water flow is 26 ~ 27m
3/ h, water distribution pressure 1.3 ~ 1.4MPa vapor pressure is 0.97 ~ 0.98MPa.
The detector unit connecting through evaporative cooler exit through the thick dedusting flue gas of decreasing temperature and increasing humidity detect qualified after, enter electrostatic precipitator and carry out next step dust separation, the macrobead meal dirt that transpiration cooling obtains is deposited to evaporative cooler outlet banana crook, by thick defeated grey chain, is delivered to ash-storing bin.
C, finish the entrance flue gas temperature T of evaporative cooler when converter oxygen top blown
1during 350 ℃ of <, feedwater trip valve, steam stop valve are closed successively automatically.
Claims (10)
1. a control method for converter dry dedusting outlet temperature for evaporation cooler, is characterized in that described control method is according to the variation of flue-gas temperature in different blowing process, controls cooling water flow, water distribution pressure and atomizing medium pressure, specifically comprises:
A, when converter oxygen top blown starts, the atomizing medium trip valve of evaporative cooler is opened automatically;
B, in the process of bessemerizing, as the entrance flue gas temperature T of evaporative cooler
1during 350 ℃ of <, not water distribution; T
1in the time of>=350 ℃, the feedwater trip valve of evaporative cooler is opened automatically, and adjusts feed water flow regulating valve and atomizing medium pressure regulator valve, and control cooling water flow is 24 ~ 27m
3/ h, water distribution pressure 1.1 ~ 1.4MPa, atomizing medium pressure 0.93 ~ 0.98MPa;
C, finish the entrance flue gas temperature T of evaporative cooler when converter oxygen top blown
1during 350 ℃ of <, feedwater trip valve, atomizing medium trip valve are closed successively automatically.
2. the control method of converter dry dedusting outlet temperature for evaporation cooler as claimed in claim 1, is characterized in that described atomizing medium is steam.
3. the control method of converter dry dedusting outlet temperature for evaporation cooler as claimed in claim 1, bessemerizes in process described in it is characterized in that, as the entrance flue gas temperature T of evaporative cooler
1in the time of>=350 ℃, the feedwater trip valve of evaporative cooler is opened automatically, stable water spray 16 ~ 24s under the aperture of feed water flow regulating valve 45 ~ 55%, and then FIC controller starts ratio, integral control, after a control cycle, TIC controller starts ratio, integral control.
4. the control method of converter dry dedusting outlet temperature for evaporation cooler as claimed in claim 3, bessemerizes in process described in it is characterized in that, as the entrance flue gas temperature T of evaporative cooler
1in the time of>=350 ℃, the feedwater trip valve of evaporative cooler is opened automatically, stable water spray 20s under the aperture of feed water flow regulating valve 50%, and then FIC controller starts ratio, integral control, after a control cycle, TIC controller starts ratio, integral control.
5. the control method of converter dry dedusting outlet temperature for evaporation cooler as claimed in claim 1, is characterized in that described converter oxygen top blown finishes, the entrance flue gas temperature T of evaporative cooler
1during 350 ℃ of <, feedwater trip valve cuts out automatically, and the output of FIC controller remains on 45 ~ 55%, and feedwater trip valve cuts out and within 26 ~ 34 seconds, automatically cuts out afterwards atomizing medium trip valve.
6. the control method of converter dry dedusting outlet temperature for evaporation cooler as claimed in claim 5, is characterized in that described converter oxygen top blown finishes, the entrance flue gas temperature T of evaporative cooler
1during 350 ℃ of <, feedwater trip valve cuts out automatically, and the output of FIC controller remains on 50%, and feedwater trip valve cuts out and within 30 seconds, automatically cuts out afterwards atomizing medium trip valve.
7. the control method of the converter dry dedusting outlet temperature for evaporation cooler as described in claim 1 ~ 6 any one, bessemerizes in process described in it is characterized in that, when the entrance flue gas temperature of evaporative cooler is 350≤T
1during 360 ℃ of <, the feedwater trip valve of evaporative cooler is opened automatically, and adjusts feed water flow regulating valve and atomizing medium pressure regulator valve, and cooling water flow is 24 ~ 25m
3/ h, water distribution pressure 1.1 ~ 1.2MPa, atomizing medium pressure
0.93 ~ 0.95MPa.
8. the control method of the converter dry dedusting outlet temperature for evaporation cooler as described in claim 1 ~ 6 any one, bessemerizes in process described in it is characterized in that, when the entrance flue gas temperature of evaporative cooler is 360≤T
1during 370 ℃ of <, the feedwater trip valve of evaporative cooler is opened automatically, and adjusts feed water flow regulating valve and atomizing medium pressure regulator valve, and cooling water flow is 25 ~ 26m
3/ h, water distribution pressure 1.2 ~ 1.3MPa, atomizing medium pressure
0.95 ~ 0.96MPa.
9. the control method of the converter dry dedusting outlet temperature for evaporation cooler as described in claim 1 ~ 6 any one, bessemerizes in process described in it is characterized in that, when the entrance flue gas temperature of evaporative cooler is 370≤T
1during 380 ℃ of <, the feedwater trip valve of evaporative cooler is opened automatically, and adjusts feed water flow regulating valve and atomizing medium pressure regulator valve, and cooling water flow is 26 ~ 27m
3/ h, water distribution pressure 1.3 ~ 1.4MPa, atomizing medium pressure
0.96 ~ 0.98MPa.
10. the control method of converter dry dedusting outlet temperature for evaporation cooler as claimed in claim 1, is characterized in that the temperature of described evaporative cooler outlet flue gas is 180≤T
2≤ 220 ℃.
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Cited By (7)
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| CN104388626A (en) * | 2014-10-31 | 2015-03-04 | 攀钢集团西昌钢钒有限公司 | Method for controlling water spraying quantity of evaporative cooler in vanadium extraction converter (EC) dry dedusting system |
| CN105200183A (en) * | 2015-11-07 | 2015-12-30 | 武钢集团昆明钢铁股份有限公司 | Operation technique of two-fluid spray nozzle for converter fume dry dedusting |
| CN105648139A (en) * | 2016-01-18 | 2016-06-08 | 邢台市富爱雾化器有限公司 | Converter gas cooling and pressure atomization device and technology |
| CN106048130A (en) * | 2016-06-27 | 2016-10-26 | 中冶华天南京电气工程技术有限公司 | Outlet smoke temperature control system and method for converter dry method dust removing evaporative cooler |
| CN109750133A (en) * | 2019-03-26 | 2019-05-14 | 莱芜钢铁集团电子有限公司 | A kind of devaporizer amount of water sprayed control method and device based on modeling |
| CN114438278A (en) * | 2022-02-14 | 2022-05-06 | 山东钢铁集团永锋临港有限公司 | Method for solving fouling of evaporation cooling cylinder under converter dry dedusting process condition |
| CN115652018A (en) * | 2022-11-24 | 2023-01-31 | 中天钢铁集团(南通)有限公司 | Method for automatically adjusting temperature of evaporative cooler |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104388626A (en) * | 2014-10-31 | 2015-03-04 | 攀钢集团西昌钢钒有限公司 | Method for controlling water spraying quantity of evaporative cooler in vanadium extraction converter (EC) dry dedusting system |
| CN104388626B (en) * | 2014-10-31 | 2016-07-27 | 攀钢集团西昌钢钒有限公司 | The control method of the injection flow rate of vapotron in converter extracting vanadium dry-dedusting system |
| CN105200183A (en) * | 2015-11-07 | 2015-12-30 | 武钢集团昆明钢铁股份有限公司 | Operation technique of two-fluid spray nozzle for converter fume dry dedusting |
| CN105648139A (en) * | 2016-01-18 | 2016-06-08 | 邢台市富爱雾化器有限公司 | Converter gas cooling and pressure atomization device and technology |
| CN105648139B (en) * | 2016-01-18 | 2017-07-18 | 邢台市富爱雾化器有限公司 | A kind of coal gas of converter cooling pressure atomizing device and technique |
| CN106048130A (en) * | 2016-06-27 | 2016-10-26 | 中冶华天南京电气工程技术有限公司 | Outlet smoke temperature control system and method for converter dry method dust removing evaporative cooler |
| CN106048130B (en) * | 2016-06-27 | 2018-01-12 | 中冶华天南京电气工程技术有限公司 | A kind of converter dry dedusting devaporizer exit gas temperature control system and method |
| CN109750133A (en) * | 2019-03-26 | 2019-05-14 | 莱芜钢铁集团电子有限公司 | A kind of devaporizer amount of water sprayed control method and device based on modeling |
| CN114438278A (en) * | 2022-02-14 | 2022-05-06 | 山东钢铁集团永锋临港有限公司 | Method for solving fouling of evaporation cooling cylinder under converter dry dedusting process condition |
| CN115652018A (en) * | 2022-11-24 | 2023-01-31 | 中天钢铁集团(南通)有限公司 | Method for automatically adjusting temperature of evaporative cooler |
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