CN101818243B - Emergency shutdown control method for large slab heating furnace - Google Patents
Emergency shutdown control method for large slab heating furnace Download PDFInfo
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- CN101818243B CN101818243B CN2009100104809A CN200910010480A CN101818243B CN 101818243 B CN101818243 B CN 101818243B CN 2009100104809 A CN2009100104809 A CN 2009100104809A CN 200910010480 A CN200910010480 A CN 200910010480A CN 101818243 B CN101818243 B CN 101818243B
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000010438 heat treatment Methods 0.000 title claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 23
- 230000009471 action Effects 0.000 claims abstract description 18
- 238000009834 vaporization Methods 0.000 claims abstract description 4
- 230000008016 vaporization Effects 0.000 claims abstract description 4
- 238000007664 blowing Methods 0.000 claims description 53
- 239000003034 coal gas Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 4
- 239000002283 diesel fuel Substances 0.000 claims description 3
- 230000000977 initiatory effect Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000001816 cooling Methods 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 abstract description 5
- 238000005096 rolling process Methods 0.000 abstract description 5
- 239000010959 steel Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention relates to an emergency shutdown control method for a large slab heating furnace, which realizes the control and alarm of the emergency shutdown of the slab heating furnace by reasonably selecting automatic shutdown conditions and process parameter values, setting shutdown interlocking equipment and action time sequence, changing the control mode of a gas regulating valve, adding sound alarm of low-pressure shutdown alarm signals of gas, air and instrument gas sources in a shutdown procedure and popping up an alarm picture. The application of the hot-rolled strip steel on the heating furnace of the production line with 1700mm and 1780mm obtains obvious effect. Even when faults such as low gas pressure, power failure of a combustion fan, low pressure of an instrument gas source, power failure of a vaporization cooling system and the like occur, safety and equipment accidents do not occur together, so that the shutdown times and time of the heating furnace are greatly reduced, and favorable conditions are created for smooth operation and yield improvement of steel rolling production.
Description
Technical field
The invention belongs to the steel rolling thermal technology and control the field, be specifically related to a kind of control method that is used for the setting and the interlocking action of heavy slab process furnace automatic emergency blowing out condition.
Background technology
The geseous fuel that process furnace uses is a mixed gas.In process of production, in case coal gas or combustion air hypotony, with regard to cause coal gas to enter in the air line easily or the air admission gas line in and cause great safety, equipment breakdowns such as the blast of catching fire, therefore for large-scale bar plate heating stove, all must be provided with automatic emergency and cut off measure, be the urgent blowing out function automatically of process furnace, to guarantee the safe in utilization of bar plate heating stove.
Yet the 1700mm production line of present China most of hot rolled strip factory and the process furnace of 170mm production line all exist defective more or less in the intrinsic urgent downtime schedule automatically:
The one, the blowing out condition setting is too much, and set(ting)value is inaccurate, and is higher or on the low side.As with automatic blowing out condition enactment being: gas main pressure is lower than 5KPa; Air main pressure is lower than 7KPa; Instrument air pressure is lower than 0.18MPa; Water-cooled tube pressure is lower than 0.35MPa; Discharging headwall, flue water beam cooling water flow are low; Evaporated cooling system is unusual etc., and wherein each reaches set(ting)value, and Controlling System all will enter automatic downtime schedule, thereby cause the frequent blowing out of process furnace, have a strong impact on carrying out smoothly of production.
The 2nd, the equipment and the sequential of the action of blowing out interlocking are unreasonable.The sequence of operation of former urgent blowing out is: 1, turn out the gas house steward trip valve and house steward's variable valve; 2, close each section coal gas and regulate trip valve; 3, flue shutter standard-sized sheet and hot blast diffuse valve and open; 4, time-delay 100s closes burner blower inlet air door, stops burner blower; 5, time-delay 300s, the flue shutter complete shut-down, hot blast diffuses valve and also closes.
The 3rd, during the blowing out interlocking, the mode of taking each section gas regulator, trip valve and magnetic valve are cut off the power supply is with each valve quick acting switching-off.But because the manner of execution of the pneumatic actuator of each process furnace gas regulator is different, valve is closed in single-acting topworks when magnetic valve cuts off the power supply, and two action actuating mechanisms still keep original position when magnetic valve cuts off the power supply, thereby cause gas main to cut off, each section gas valve keeps original position, very easily causes the back draft accident.
Because process furnace blowing out condition setting is too much, set(ting)value is unreasonable in addition, therefore in process furnace increase and decrease coal gas amount process, the gas main pressure surge easily reaches automatic blowing out set(ting)value and frequent blowing out, the burning steel that not only directly delays process furnace, and have a strong impact on the ordinary production of rolling line, cause great financial loss.Therefore, after the blowing out technology was used for some time automatically, each hot rolled strip factory had all stopped the operation of the urgent downtime schedule of process furnace one after another.And because the equipment and the timing Design of the action of blowing out interlocking are unreasonable automatically, and gas regulator cut-out mode is unreasonable, coal gas low pressure, burner blower power failure, burning control CPU all once appearred, emergency situatioies such as power failure, instrument air interruption, even occurred owing to stop instrument air and stop coal gas, and cause the back draft of total pipeline coal gas, and cause the accident of gas line two side stopboard sealing leaks, production and device security have been caused serious threat and influence.
Summary of the invention
Purpose of the present invention is exactly at the problems referred to above, aiming to provide a kind of parameter selects rationally, the programdesign science, sequential control is optimized, automatic interlock is effective, can reduce urgent blowing out number of times, can guarantee equipment safety operation again, avoid the generation of various accidents, improve the urgent stopping process of process furnace of plant factor and heating, rolling output.
For this reason, the technical solution that the present invention taked is:
A kind of emergency blowout control method for large slab heating furnace, by the automatic blowing out condition of choose reasonable and process parameter value, the automatic blowing out interlock device of setting and action sequence, change gas regulator control mode, setting up the audible alarm of coal gas, air and instrument supply gas fist low pressure blowing out guard signal and ejecting the warning picture in the downtime schedule automatically, realize the control and the warning of the urgent blowing out of bar plate heating stove.
Its concrete processing parameter and control method are:
1, satisfies two conditions when gas pressure, when promptly gas main pressure is lower than 4.5KPa and gas main pressure switch and low pressure alarming occurs, start automatic downtime schedule;
2, satisfy two conditions when air pressure, when promptly air main pressure is lower than 4.5KPa and air main pressure switch and low pressure alarming occurs, start automatic downtime schedule;
3, when instrument air pressure is lower than 0.3KPa, start automatic downtime schedule;
4, be lower than 0.2MPa and house steward's cooling water flow is lower than 60m when the total pipe pressure of water coolant
3During/h, carry out fault alarm;
When 5, pressure reduction is not set up yet after the drum liquid level is lower than 240mm and vaporization diesel oil pump initiating signal time-delay 20s, weigh fault alarm;
6, after the automatic blowing out condition of appearance need be delayed time 3s, start following automatic interlock action: a, flue shutter standard-sized sheet; B, hot blast diffuse valve and open; C, gas main and each section variable valve Close All; D, fans entrance variable valve and each section hot blast variable valve standard-sized sheet;
7, in carrying out the action of automatic blowing out interlocking, directly provide the 4mA signal to control, and the operator is adjusted into 0 with the output of gas regulator on computer picture, promptly cuts off single-acting and double-acting gas regulator simultaneously to gas regulator;
The present invention has obtained obvious effects through using on the process furnace of hot rolled strip 1700mm production line and 1780mm production line.Since the urgent stopping process of process furnace of the present invention is used, though coal gas low pressure also once repeatedly occurred in producing, the burner blower power down, instrument air low pressure, faults such as evaporated cooling system power failure, but the present invention's urgent blowing out technology can both be fully according to program and the processing parameter set, report to the police according to pre-set level timely and accurately and point out, and according to corresponding equipment and the action of sequential realization interlocking, security incident and equipment breakdown together do not take place, thereby process furnace blowing out number of times and time have greatly been reduced, for improving the process furnace utilization coefficient, favourable condition has been created in the direct motion that assurance steel rolling is produced and the raising of output, and makes the urgent downtime schedule of having given it up obtain reactivating.
Embodiment
The present invention is directed to the major defect that the urgent blowing out technology of original design process furnace exists, utilize the PLC sequence of control and the function of original main control computer, in automatic blowing out condition of choose reasonable and process parameter value again, again the action sequence of automatic blowing out interlock device of optimization setting and equipment room, change the gas regulator control mode simultaneously, and setting up coal gas in the downtime schedule automatically, the audible alarm of air and instrument air low pressure blowing out guard signal also ejects the warning picture, take automatically control to combine with operating manually, thus the automatic warning and the control of the urgent blowing out of realization bar plate heating stove.
Its concrete processing parameter and control method are:
Is automatic blowing out with the blowing out condition in the crude gas system by " gas main pressure is lower than 5KPa ", is set at when gas main pressure is lower than 4.5KPa and gas main pressure switch and low pressure alarming occurs, starts automatic downtime schedule; Make gas pressure must satisfy two condition blowing outs automatically simultaneously.
With the blowing out condition in the former air system by " air main pressure is lower than 7KPa blowing out at once ", change into when satisfied simultaneously two conditions of air pressure, be air main pressure when being lower than 4.5KPa and air main pressure switch and low pressure alarming occurring, the side starts automatic downtime schedule.
Automatic blowing out condition in the former instrument air system by " it is blowing out that instrument air pressure is lower than 0.18KPa ", is brought up to when instrument air pressure is lower than 0.3KPa, started automatic downtime schedule.
Blowing out condition in the former water-cooling system by " the total pipe pressure of water coolant is lower than 0.35MPa and discharging headwall, flue water beam cooling water flow is low is automatic blowing out ", is adjusted into when the total pipe pressure of water coolant and is lower than 0.2MPa and house steward's cooling water flow is lower than 60m
3During/h, carry out fault alarm.
Blowing out condition in the former evaporated cooling system by " evaporated cooling system is unusual " automatically blowing out at once, is revised when being lower than 240mm and vaporization diesel oil pump initiating signal when the drum liquid level and delaying time that pressure reduction is not set up yet behind the 20s, weighed fault alarm.
With the former blowing out interlocking action of directly carrying out, be defined as after the automatic blowing out condition of appearance need be delayed time 3s, start following automatic interlock action: a, flue shutter standard-sized sheet; B, hot blast diffuse valve and open; C, gas main and each section variable valve Close All; D, fans entrance variable valve and each section hot blast variable valve standard-sized sheet.
With the qualification cancellation of former blowing out interlocking action " need time-delay 300s, flue valve complete shut-down, hot blast diffuses valve and closes ", redefine when automatic blowing out condition occurring, after the on-the-spot affirmation of operator, manual operation is closed hot blast and is diffused valve.Simultaneously, the action that having deleted the action of former automatic blowing out interlocking " needs time-delay 100s, close burner blower inlet air door, stop burner blower " limits, guarantee burner blower normally operation after blowing out, avoided gas regulator tight and air pressure is low and coal gas is entered in the air line set off an explosion.
In carrying out the action of blowing out interlocking, to originally the control mode of gas regulator be cut off the power supply by coal supply pneumoelectric magnet valve, redefine to directly providing the 4mA signal to control to gas regulator, and the operator is adjusted into 0 with the output of gas regulator on computer picture, and bonding effect and double-acting gas regulator cut off when urgent blowing out simultaneously.
In downtime schedule, increase the audible alarm of coal gas, air and instrument air low pressure blowing out guard signal and on display screen, ejected the warning picture, reminded operator's operation in time and affirmation.
Claims (1)
1. emergency blowout control method for large slab heating furnace, it is characterized in that, by the automatic blowing out condition of choose reasonable and process parameter value, the automatic blowing out interlock device of setting and action sequence, change gas regulator control mode, setting up the audible alarm of coal gas, air and instrument air low pressure blowing out guard signal and ejecting the warning picture in the downtime schedule automatically, realize the automatic control and the warning of the urgent blowing out of bar plate heating stove; Its concrete processing parameter and control method are:
(1), satisfy two conditions when gas pressure, when promptly gas main pressure is lower than 4.5KPa and gas main pressure switch and low pressure alarming occurs, start automatic downtime schedule;
(2), satisfy two conditions when air pressure, when promptly air main pressure is lower than 4.5KPa and air main pressure switch and low pressure alarming occurs, start automatic downtime schedule;
(3), when instrument air pressure is lower than 0.3KPa, start automatic downtime schedule;
(4), be lower than 0.2MPa and house steward's cooling water flow is lower than 60m when the total pipe pressure of water coolant
3During/h, carry out fault alarm;
(5), when pressure reduction is not set up yet after the drum liquid level is lower than 240mm and vaporization diesel oil pump initiating signal time-delay 20s, weigh fault alarm;
(6), need delay time behind the 3s, starts following automatic interlock and move: a, gas main and each section variable valve Close All when automatic blowing out condition occurring; B, hot blast diffuse valve and open; C, flue shutter standard-sized sheet; D, fans entrance variable valve and each section hot blast variable valve standard-sized sheet;
(7), in carrying out the action of automatic blowing out interlocking, directly provide the 4mA signal to control, and the operator is adjusted into 0 with the output of gas regulator on computer picture to gas regulator, promptly cut off single-acting and double-acting gas regulator simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100104809A CN101818243B (en) | 2009-02-27 | 2009-02-27 | Emergency shutdown control method for large slab heating furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100104809A CN101818243B (en) | 2009-02-27 | 2009-02-27 | Emergency shutdown control method for large slab heating furnace |
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| CN101818243A CN101818243A (en) | 2010-09-01 |
| CN101818243B true CN101818243B (en) | 2011-07-27 |
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| CN2009100104809A Active CN101818243B (en) | 2009-02-27 | 2009-02-27 | Emergency shutdown control method for large slab heating furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107121951B (en) * | 2017-04-24 | 2019-12-31 | 山东国电发电工程有限公司 | Interlocking protection function input and exit monitoring system and method |
| CN113689676B (en) * | 2021-08-31 | 2023-05-30 | 索奥斯(广东)玻璃技术股份有限公司 | Monitoring analysis method and monitoring analysis system for toughened glass production line |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201156288Y (en) * | 2008-01-31 | 2008-11-26 | 志圣科技（广州）有限公司 | Gas concentration detection alarming and automatic processing apparatus |
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- 2009-02-27 CN CN2009100104809A patent/CN101818243B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201156288Y (en) * | 2008-01-31 | 2008-11-26 | 志圣科技（广州）有限公司 | Gas concentration detection alarming and automatic processing apparatus |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2005-179750A 2005.07.07 |
| 张芳.《燃气锅炉停炉期间煤气爆炸事故分析与防范措施》.《冶金动力》.2001,(第6期),37-40. * |
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| CN101818243A (en) | 2010-09-01 |
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