CN101760606A - Control method of protective atmosphere of stainless steel cover type annealing furnace - Google Patents
Control method of protective atmosphere of stainless steel cover type annealing furnace Download PDFInfo
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- CN101760606A CN101760606A CN200810163929A CN200810163929A CN101760606A CN 101760606 A CN101760606 A CN 101760606A CN 200810163929 A CN200810163929 A CN 200810163929A CN 200810163929 A CN200810163929 A CN 200810163929A CN 101760606 A CN101760606 A CN 101760606A
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Abstract
The invention relates to a control method of a protective atmosphere of a stainless steel cover type annealing furnace, which is characterized by sequentially comprising the following steps of: a. blowing air inside an inner cover of a furnace platform; b. replacing nitrogen inside the inner cover with hydrogen: setting the maximum discharge flow rate of an electromagnetic valve into 30 m3/h according to process requirements; introducing the hydrogen into the inner cover to replace the nitrogen inside the inner cover according to the set flow rate for normally operation; discharging a mixed gas of the hydrogen and the nitrogen through a waste gas regulating valve and a discharge pipe, wherein when the total amount of the hydrogen reaches 22 m3 during the operation, the electromagnetic valve of hydrogen flow rate is automatically closed; c. stabilizing voltage: ensuring pressure inside the annealing furnace to be kept between 2 kPa and 6 kPa; and d. blowing the hydrogen inside the inner cover of the furnace platform after annealing is finished. The invention solves the problem that the hydrogen can not be normally introduced at a debugging stage and reduces the hydrogen consumption of a whole annealing period, one annealing cycle period of an original process needs to consume the hydrogen about 240 m3, and one annealing cycle period of the control method needs to consume the hydrogen about 30 m3-35 m3, thus production cost is greatly saved.
Description
Technical field
The present invention relates to a kind of stainless steel industry bell-type annealing machine set technology field, especially refer to the control method of protective atmosphere of stainless steel cover type annealing furnace.
Background technology
The stainless steel full-hydrogen hood-type annealing furnace protective atmosphere CONTROL PROCESS of existing design roughly has following a few step:
1. air purge uses the nitrogen replacement air all by pneumavalve 801, and after purging finished, then this valve cut out up to annealing and finishes;
2. regulating the valve position degree of SV-809 magnetic valve in debug process earlier, normally in service, is 30m by the maximum emission flow of processing requirement
3/ h, its data read from Roots type flowmeter;
3. be 15m as the processing requirement emission flow
3/ h, the mode of then discharging the SV-809 electromagnetic valve switch was stopped 7.5 minutes by opening 7.5 minutes, opened 7.5 minutes, stopped 7.5 minutes, opened 7.5 minutes again, stopped 7.5 minutes, opened 7.5 minutes, stopped 7.5 minutes, and reality per hour flow is 15m
3/ h;
4. be 8m as the processing requirement emission flow
3/ h, the mode of then discharging the SV-809 electromagnetic valve switch was stopped 11 minutes by opening 4 minutes, opened 4 minutes, stopped 11 minutes, opened 4 minutes again, stopped 11 minutes, opened 4 minutes, stopped 11 minutes, and reality per hour flow is 8m
3/ h;
5. purge before annealing finishes, use nitrogen replacement hydrogen, directly by pneumavalve UV-801 discharging.
Above-mentioned CONTROL PROCESS mainly contains 3 problems:
1. in equipment running process, go wrong be when hydrogen exchange nitrogen owing to inner cover in the high hydrogen that makes of atmosphere pressures can't enter situation in the inner cover, if heighten hydrogen inlet pressure, will cause furnace pressure to raise and occur reporting to the police, by regulating the valve position degree of SV-809 magnetic valve, increase SV-809 magnetic valve opening degree, hydrogen can enter inner cover like this, but the problem that hydrogen consumption strengthens can occur.
2. because a large amount of dischargings of hydrogen also cause the heat in the inner cover to run off in a large number, waste energy.
If 3. the mode that opens and closes at interval by control magnetic valve SV-809 is discharged shielding gas, also can cause the furnace pressure instability.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of hydrogen can replace nitrogen smoothly at above-mentioned prior art present situation and can reduce the control method of the protective atmosphere of stainless steel cover type annealing furnace of hydrogen consumption in the anneal cycles effectively.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: the control method of this protective atmosphere of stainless steel cover type annealing furnace is characterized in that: in turn include the following steps:
Air in a, the purging table inner cover: open the nitrogen pneumavalve, with the air in the nitrogen replacement inner cover, nitrogen and Air mixing gas are discharged by delivery pipe through waste gas regulating valve simultaneously, and after the air in the inner cover was replaced into nitrogen fully, pneumavalve cut out up to annealing and finishes;
B, by the nitrogen in the hydrogen exchange inner cover: regulate the valve position degree of the magnetic valve of hydrogen flowing quantity, and be set at 30m by the maximum emission flow that processing requirement is set magnetic valve
3/ h makes hydrogen feed inner cover by the flow of setting and replaces nitrogen and normal operation in the inner cover, and the gas mixture of hydrogen and nitrogen is discharged by delivery pipe through waste gas regulating valve simultaneously, and when operation, the hydrogen total amount in entering inner cover reaches 22m
3, the magnetic valve of just automatic closing control hydrogen flowing quantity;
C, voltage stabilizing: after finishing hydrogen exchange nitrogen, enter the normarzing annealing process, in this process, when furnace pressure was lower than 2KPa, hydrogen just replenished automatically, made the pressure in the stove be higher than 2Kpa; And when furnace pressure was higher than 6KPa, magnetic valve was opened discharge hydrogen automatically and is carried out release, maintained between 2KPa～6KPa to guarantee the pressure in the stove;
D, annealing finish the hydrogen in the post-purge table inner cover: open the nitrogen pneumavalve, feed nitrogen and replace hydrogen, the gas mixture of nitrogen and hydrogen is discharged by delivery pipe through waste gas regulating valve simultaneously.
As improvement, the influx of described hydrogen and nitrogen preferably adopts Roots type flowmeter to detect in real time and controls by the PLC of system.
Compared with prior art, the present invention adopts the valve position degree of the magnetic valve of regulating hydrogen flowing quantity, and is set at 30m by the maximum emission flow of processing requirement setting magnetic valve
3/ h makes hydrogen feed inner cover by the flow of setting and replaces nitrogen and normal operation in the inner cover, and the gas mixture of hydrogen and nitrogen is discharged by delivery pipe through waste gas regulating valve simultaneously, when operation, when the hydrogen total amount reaches 22m
3, just close the magnetic valve of hydrogen flowing quantity automatically; And, in annealing process, when furnace pressure is lower than 2KPa, the influx that hydrogen just increases hydrogen automatically makes the pressure in the stove be higher than 2KPa, and when furnace pressure is higher than 6KPa, magnetic valve is opened discharge hydrogen automatically and is carried out release, maintains between 2KPa～6KPa to guarantee the pressure in the stove.By improving above-mentioned protective atmosphere control method, the invention has the advantages that at existing installation and not influencing under the situation of quality product, 1. based on voltage stabilizing, solved the problem that can't normally drop at debug phase hydrogen; 2. reduced the hydrogen consumption of whole annealing cycle, originally technology anneal cycles cycle need consume hydrogen and probably is 240m
3, it probably is 30～35m that anneal cycles cycle of present method need consume hydrogen
3, greatly saved production cost; 3. because the hydrogen discharge amount significantly reduces, also reduce by exhaust heat thereupon, thereby further saved the energy.
Embodiment
Below in conjunction with embodiment the present invention is described in further detail.
The control method of the protective atmosphere of stainless steel cover type annealing furnace of present embodiment in turn includes the following steps:
Air in a, the purging table inner cover: open the nitrogen pneumavalve, with the air in the nitrogen replacement inner cover, simultaneously nitrogen and Air mixing gas are discharged by delivery pipe through waste gas regulating valve, until the air in the inner cover is put finish nitrogen after, pneumavalve cuts out up to annealing and finishes; B, by the nitrogen in the hydrogen exchange inner cover: regulate the valve position degree of the magnetic valve of hydrogen flowing quantity, and be set at 30m by the maximum emission flow that processing requirement is set magnetic valve
3/ h makes hydrogen feed inner cover by the flow of setting and replaces nitrogen and normal operation in the inner cover, and the gas mixture of hydrogen and nitrogen is discharged by delivery pipe through waste gas regulating valve simultaneously, when operation, when the hydrogen total flux reaches 22m
3/ h is with regard to closing the magnetic valve of hydrogen flowing quantity automatically, till nitrogen all is replaced as hydrogen; C, voltage stabilizing: in annealing process, when furnace pressure is lower than 2KPa, the influx that hydrogen just increases hydrogen automatically makes the pressure in the stove be higher than 2KPa, and when furnace pressure is higher than 6KPa, magnetic valve is opened discharge hydrogen automatically and is carried out release, maintains between 2KPa～6KPa to guarantee the pressure in the stove; D, annealing finish the hydrogen in the post-purge table inner cover: open the nitrogen pneumavalve, feed nitrogen and replace hydrogen, the gas mixture of nitrogen and hydrogen is discharged by delivery pipe through waste gas regulating valve simultaneously.Its influx of above-mentioned hydrogen adopts Roots type flowmeter to control.
Below the annealing steps of stainless steel cover type annealing furnace of the present invention is described:
An annealing process procedure mainly is made up of following step: operator will need the annealed coil of strip to be deposited on the table by the stacking requirement.Inner cover is set, and uses hydraulic locking apparatus that inner cover is clamped on the table flange to seal.Carry out the seal test of hydrogen valve and interior cover system.If hydrogen valve and interior cover system are airtightly not leak, just adopt the air in the nitrogen replacement inner cover.Replacement process needs 140m
3The nitrogen of/h, the time length approximately needs 25 minutes.In the process of nitrogen purging inner cover, heating mantles is lifted on the inner cover, when the oxygen level detected result in the inner cover less than 1% the time, the burner on the heating mantles is igniting automatically just; Before the burner igniting, heating mantles combustion air high temperature butterfly valve is all opened, and blower fan is with the burner hearth between peak flow purging heating mantles and inner cover, and about 5 minutes of purge time guarantees no inflammable gas in the burner hearth, burner igniting then.The heating mantles igniting is that each burner carries out respectively automatically from top to bottom, and flame detecting device detects the combustion position of burner.
Go out nitrogen in the inner cover with hydrogen exchange in the time of the heating mantles firing up, hydrogen/nitrogen mixture will go out factory building by discharged, then use about 30m
3The hydrogen exchange nitrogen of/h afterwards, is closed the nitrogen discharge valve, hydrogen by recirculation blower at the stove internal recycle.For the hydrogen/nitrogen mixture steam of discharging, regulate with the control furnace pressure by waste gas regulating valve.
Soaking is carried out the hot seal test of table before finishing automatically.After hot seal test was finished, system entered cooling stages, removed heating mantles, covered cooling cowl, and cooling blower is connected automatically and opened.Cooling stages is divided into the cooling of band heating mantles, air cooling, the cooling of cooling cowl exhausting.When annealing back steel roll temperature dropped to the drop temperature that presets, the speed of table high temperature circulation blower fan dropped to 750rpm and opens the nitrogen inlet valve, and nitrogen is with 140m
3The flow of/h purges, about 25 minutes of time length.After purging is finished, remove cooling cowl, unclamp hydraulic locking apparatus, remove inner cover, prepare annealing next time after the table discharging, an anneal cycles end cycle.
Claims (2)
1. the control method of a protective atmosphere of stainless steel cover type annealing furnace is characterized in that: in turn include the following steps:
Air in a, the purging table inner cover: open the nitrogen pneumavalve, with the air in the nitrogen replacement inner cover, simultaneously nitrogen and Air mixing gas are discharged by delivery pipe through waste gas regulating valve, until the air in the inner cover is put finish nitrogen after, pneumavalve cuts out up to annealing and finishes;
B, by the nitrogen in the hydrogen exchange inner cover: regulate the valve position degree of the magnetic valve of hydrogen flowing quantity, and be set at 30m by the maximum emission flow that processing requirement is set magnetic valve
3/ h makes hydrogen feed inner cover by the flow of setting and replaces nitrogen and normal operation in the inner cover, and the gas mixture of hydrogen and nitrogen is discharged by delivery pipe through waste gas regulating valve simultaneously, when operation, when the hydrogen total amount reaches 22m
3, just close the magnetic valve of hydrogen flowing quantity automatically;
C, voltage stabilizing: after finishing hydrogen exchange nitrogen, enter the normarzing annealing process, in this process, when furnace pressure is lower than 2KPa, hydrogen just replenishes automatically, makes the pressure in the stove be higher than 2KPa, when furnace pressure is higher than 6KPa, magnetic valve is opened discharge hydrogen automatically and is carried out release, maintains between 2KPa～6KPa to guarantee the pressure in the stove;
D, annealing finish the hydrogen in the post-purge table inner cover: open the nitrogen pneumavalve, feed nitrogen and replace hydrogen, the gas mixture of nitrogen and hydrogen is discharged by delivery pipe through waste gas regulating valve simultaneously.
2. control method according to claim 1 is characterized in that: its influx of described hydrogen adopts Roots type flowmeter to control.
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| CN2008101639290A CN101760606B (en) | 2008-12-26 | 2008-12-26 | Control method of protective atmosphere of stainless steel cover type annealing furnace |
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|---|---|---|---|
| CN2008101639290A CN101760606B (en) | 2008-12-26 | 2008-12-26 | Control method of protective atmosphere of stainless steel cover type annealing furnace |
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| CN101760606B CN101760606B (en) | 2011-06-22 |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892367A (en) * | 2010-07-23 | 2010-11-24 | 中冶南方(武汉)威仕工业炉有限公司 | Air supplying method for protective atmospheres of different hydrogen concentration sections |
| CN102080932A (en) * | 2010-12-02 | 2011-06-01 | 苏州中门子科技有限公司 | Gas online detection device in protective gas heat treatment furnace |
| CN102251095A (en) * | 2011-06-24 | 2011-11-23 | 湖南华菱涟源钢铁有限公司 | Automatic control device of soaking pit cooling air |
| CN103266211A (en) * | 2013-04-24 | 2013-08-28 | 苏州品源气体设备有限公司 | System for recovery and recycle of bell jar-type bright annealing furnace shielding gas |
| CN103276191A (en) * | 2013-06-06 | 2013-09-04 | 攀钢集团攀枝花钢钒有限公司 | Purge method for annealing of low-carbon cold-roll steel sheets |
| CN103305680A (en) * | 2013-06-08 | 2013-09-18 | 首钢总公司 | Method for producing cold-rolled sheet by means of cover annealing blowing |
| CN103555924A (en) * | 2013-11-08 | 2014-02-05 | 中冶南方(武汉)威仕工业炉有限公司 | Atmosphere replacement system of continuous annealing furnace |
| CN103555925A (en) * | 2013-11-08 | 2014-02-05 | 中冶南方(武汉)威仕工业炉有限公司 | Vertical-type continuous annealing furnace for titanium plate and steel strip |
| CN103555926A (en) * | 2013-11-08 | 2014-02-05 | 中冶南方(武汉)威仕工业炉有限公司 | Atmosphere replacement method for continuous annealing furnace |
| CN106676246A (en) * | 2017-03-04 | 2017-05-17 | 何盼 | Efficient heat treatment equipment with pressure-stabilizing protection function and for gas steel pipe production |
| CN107419074A (en) * | 2017-04-27 | 2017-12-01 | 山东钢铁集团日照有限公司 | A kind of process for eliminating cold rolling coil corrosion defect |
| CN108070692A (en) * | 2017-11-30 | 2018-05-25 | 重庆徐丁科技有限公司 | A kind of steel alloy motorcycle accessories annealing process |
| CN113430339A (en) * | 2021-06-04 | 2021-09-24 | 唐山钢铁集团有限责任公司 | Control method of protective atmosphere of bell-type annealing furnace |
| CN114525382A (en) * | 2021-12-09 | 2022-05-24 | 山西太钢不锈钢股份有限公司 | Method for improving annealing uniformity of bell-type furnace |
| CN114959194A (en) * | 2022-05-07 | 2022-08-30 | 宁波宝新不锈钢有限公司 | Cover type annealing process for hot-rolled ferritic stainless steel |
| CN115584384A (en) * | 2022-10-19 | 2023-01-10 | 攀钢集团攀枝花钢钒有限公司 | Method and system for processing high-temperature test incompatibility of bell-type furnace |
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2008
- 2008-12-26 CN CN2008101639290A patent/CN101760606B/en active Active
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892367A (en) * | 2010-07-23 | 2010-11-24 | 中冶南方(武汉)威仕工业炉有限公司 | Air supplying method for protective atmospheres of different hydrogen concentration sections |
| CN102080932A (en) * | 2010-12-02 | 2011-06-01 | 苏州中门子科技有限公司 | Gas online detection device in protective gas heat treatment furnace |
| CN102251095A (en) * | 2011-06-24 | 2011-11-23 | 湖南华菱涟源钢铁有限公司 | Automatic control device of soaking pit cooling air |
| CN102251095B (en) * | 2011-06-24 | 2013-01-16 | 湖南华菱涟源钢铁有限公司 | Automatic control device of soaking pit cooling air |
| CN103266211A (en) * | 2013-04-24 | 2013-08-28 | 苏州品源气体设备有限公司 | System for recovery and recycle of bell jar-type bright annealing furnace shielding gas |
| CN103276191B (en) * | 2013-06-06 | 2014-09-10 | 攀钢集团攀枝花钢钒有限公司 | Purge method for annealing of low-carbon cold-roll steel sheets |
| CN103276191A (en) * | 2013-06-06 | 2013-09-04 | 攀钢集团攀枝花钢钒有限公司 | Purge method for annealing of low-carbon cold-roll steel sheets |
| CN103305680A (en) * | 2013-06-08 | 2013-09-18 | 首钢总公司 | Method for producing cold-rolled sheet by means of cover annealing blowing |
| CN103555924A (en) * | 2013-11-08 | 2014-02-05 | 中冶南方(武汉)威仕工业炉有限公司 | Atmosphere replacement system of continuous annealing furnace |
| CN103555925A (en) * | 2013-11-08 | 2014-02-05 | 中冶南方(武汉)威仕工业炉有限公司 | Vertical-type continuous annealing furnace for titanium plate and steel strip |
| CN103555926A (en) * | 2013-11-08 | 2014-02-05 | 中冶南方(武汉)威仕工业炉有限公司 | Atmosphere replacement method for continuous annealing furnace |
| CN103555926B (en) * | 2013-11-08 | 2015-04-22 | 中冶南方(武汉)威仕工业炉有限公司 | Atmosphere replacement method for continuous annealing furnace |
| CN103555924B (en) * | 2013-11-08 | 2015-07-08 | 中冶南方(武汉)威仕工业炉有限公司 | Atmosphere replacement system of continuous annealing furnace |
| CN106676246A (en) * | 2017-03-04 | 2017-05-17 | 何盼 | Efficient heat treatment equipment with pressure-stabilizing protection function and for gas steel pipe production |
| CN107419074A (en) * | 2017-04-27 | 2017-12-01 | 山东钢铁集团日照有限公司 | A kind of process for eliminating cold rolling coil corrosion defect |
| CN107419074B (en) * | 2017-04-27 | 2019-06-04 | 山东钢铁集团日照有限公司 | A kind of process for eliminating cold rolling coil corrosion defect |
| CN108070692A (en) * | 2017-11-30 | 2018-05-25 | 重庆徐丁科技有限公司 | A kind of steel alloy motorcycle accessories annealing process |
| CN113430339A (en) * | 2021-06-04 | 2021-09-24 | 唐山钢铁集团有限责任公司 | Control method of protective atmosphere of bell-type annealing furnace |
| CN114525382A (en) * | 2021-12-09 | 2022-05-24 | 山西太钢不锈钢股份有限公司 | Method for improving annealing uniformity of bell-type furnace |
| CN114525382B (en) * | 2021-12-09 | 2024-04-26 | 山西太钢不锈钢股份有限公司 | Method for improving annealing uniformity of bell-type furnace |
| CN114959194A (en) * | 2022-05-07 | 2022-08-30 | 宁波宝新不锈钢有限公司 | Cover type annealing process for hot-rolled ferritic stainless steel |
| CN115584384A (en) * | 2022-10-19 | 2023-01-10 | 攀钢集团攀枝花钢钒有限公司 | Method and system for processing high-temperature test incompatibility of bell-type furnace |
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