CN107782165B - Air-fuel ratio adjusting method for heating furnace - Google Patents
Air-fuel ratio adjusting method for heating furnace Download PDFInfo
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- CN107782165B CN107782165B CN201610785843.6A CN201610785843A CN107782165B CN 107782165 B CN107782165 B CN 107782165B CN 201610785843 A CN201610785843 A CN 201610785843A CN 107782165 B CN107782165 B CN 107782165B
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- Prior art keywords
- air
- fuel ratio
- residual oxygen
- value
- heating furnace
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
- F27D2019/0012—Monitoring the composition of the atmosphere or of one of their components
- F27D2019/0015—Monitoring the composition of the exhaust gases or of one of its components
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0034—Regulation through control of a heating quantity such as fuel, oxidant or intensity of current
- F27D2019/004—Fuel quantity
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Heat Treatment Processes (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention relates to a method for adjusting the air-fuel ratio of a heating furnace, which adjusts the air-fuel ratio according to a residual oxygen value, wherein the air-fuel ratio of the heating furnace is set to be 2:1, air-fuel ratio limit value: 1.6-2.6; when the residual oxygen value is 1.6-3.0, the air-fuel ratio is not adjusted; when the residual oxygen value is less than 1.6, the air-fuel ratio is increased by 0.05, the time is delayed for 30 seconds after each increasing setting, and after the time is delayed for 30 seconds, if the residual oxygen fluctuates between 1.6 and 2.6, the set value is unchanged; if the residual oxygen value is still less than 1.6, continuing to increase progressively according to the principle of increasing progressively by 0.05 until the residual oxygen value is increased progressively to be between 1.6 and 3.0. The invention has the advantages that: the residual oxygen value can be kept in a reasonable range by adjusting the air-fuel ratio from time to time, thereby reducing the heat loss and improving the heat efficiency of the heating furnace. And the normal adjustment of the air-fuel ratio of the heating furnace is ensured by temporarily adopting other intact residual oxygen meters.
Description
Technical Field
The invention relates to a method for adjusting the air-fuel ratio of a heating furnace.
Background
The residual oxygen quantity at the tail of the heating furnace of the hot-rolled strip steel needs to be controlled within a certain range, too high proportion can cause too much air to take away a large amount of heat, too low proportion can cause incomplete combustion of coal gas, and the heat efficiency of the heating furnace is reduced, so the residual oxygen value needs to be controlled within a reasonable range, at present, the residual oxygen at the tail of the 2150 line heating furnace is controlled between 1.6% and 3%, an operator can adjust the air-fuel ratio according to the value displayed by a residual oxygen meter, and therefore the proportion of the residual oxygen is adjusted, but the operator cannot adjust discontinuously from time to time, and the hot-rolled strip steel has hysteresis and discontinuous property.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for adjusting the air-fuel ratio of a heating furnace, which can adjust the air-fuel ratio in time, ensure that residual oxygen is in a reasonable range and improve the heat efficiency of the heating furnace.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for adjusting the air-fuel ratio of a heating furnace is used for adjusting the air-fuel ratio according to a residual oxygen value, and specifically comprises the following steps:
1) the air-fuel ratio of the heating furnace is set to be 2:1, air-fuel ratio limit value: 1.6-2.6; when the residual oxygen value is 1.6-3.0, the air-fuel ratio is not adjusted;
2) when the residual oxygen value is less than 1.6, the air-fuel ratio is increased by 0.05, the time is delayed for 30 seconds after each increasing setting, and after the time is delayed for 30 seconds, if the residual oxygen fluctuates between 1.6 and 2.6, the set value is unchanged; if the residual oxygen value is still less than 1.6, continuing to increase progressively according to the principle of increasing progressively by 0.05 until the residual oxygen value is increased progressively to be between 1.6 and 3.0;
3) when the residual oxygen value is larger than 3.0, the air-fuel ratio is decreased progressively according to 0.03, the time delay is 30 seconds after each decreasing setting, and after the time delay is 30 seconds, if the residual oxygen fluctuates between 1.6 and 3.0, the setting value is unchanged; if the oxygen content is still more than 3.0, continuing to decrease according to the decreasing 0.03 principle until the oxygen content is decreased to be between 1.6 and 3.0.
And if a certain residual oxygen meter fails, the detected heating furnace is replaced by the air-fuel ratios of the other heating furnaces, namely the air-fuel ratios of the other heating furnaces are adjusted.
Compared with the prior art, the invention has the beneficial effects that:
the residual oxygen value can be kept in a reasonable range by adjusting the air-fuel ratio from time to time, thereby reducing the heat loss and improving the heat efficiency of the heating furnace. And the normal adjustment of the air-fuel ratio of the heating furnace is ensured by temporarily adopting other intact residual oxygen meters.
Drawings
FIG. 1 is a control schematic of an embodiment.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings, but it should be noted that the present invention is not limited to the following embodiments.
The air-fuel ratio adjusting method of the heating furnace adjusts the air-fuel ratio according to the residual oxygen value, and specifically comprises the following steps:
1) the air-fuel ratio of the heating furnace is set to be 2:1, air-fuel ratio limit value: 1.6-2.6; when the residual oxygen value is 1.6-3.0, the air-fuel ratio is not adjusted;
2) when the residual oxygen value is less than 1.6, the air-fuel ratio is increased by 0.05, the time is delayed for 30 seconds after each increasing setting, and after the time is delayed for 30 seconds, if the residual oxygen fluctuates between 1.6 and 2.6, the set value is unchanged; if the residual oxygen value is still less than 1.6, continuing to increase progressively according to the principle of increasing progressively by 0.05 until the residual oxygen value is increased progressively to be between 1.6 and 3.0;
3) when the residual oxygen value is larger than 3.0, the air-fuel ratio is decreased progressively according to the principle of 0.03, the time is delayed for 30 seconds after each decreasing setting, and after the time is delayed for 30 seconds, if the residual oxygen fluctuates between 1.6 and 3.0, the setting value is unchanged; if the oxygen content is still more than 3.0, continuing to decrease according to the decreasing 0.03 principle until the oxygen content is decreased to be between 1.6 and 3.0.
And if a certain residual oxygen meter fails, the air-fuel ratios of the other heating furnaces are adopted for substitution, namely the air-fuel ratios are adjusted along with the air-fuel ratios of the other heating furnaces.
Examples
The hot-rolled strip steel 2150 line has three heating furnaces, each heating furnace is provided with one residual oxygen meter, but in actual production, a fault of a certain residual oxygen meter may occur or the residual oxygen of a certain heating furnace is inaccurate to detect due to other reasons, and at the moment, the air-fuel ratio of other furnaces is adopted for replacement, namely, the air-fuel ratio of other furnaces is automatically adjusted.
Referring to fig. 1, when the furnace 1# main control ON, the furnace 2# main control ON, and the furnace 3# main control ON are selected, respectively, the air-fuel ratios of the three furnaces are adjusted according to the residual oxygen values of the respective furnaces, respectively.
When the 1# furnace main control ON and the 2# furnace ON or the 3# furnace ON below the 1# furnace main control ON are selected, the air-fuel ratio of the 2# furnace or the 3# furnace is adjusted according to the air-fuel ratio adjusted by the 1# furnace main control, and the 2# furnace and the 3# furnace are also controlled in the manner.
When the air-fuel ratio is adjusted according to the residual oxygen value, the method comprises the following steps:
1) the air-fuel ratio of the heating furnace is set to be 2:1, air-fuel ratio limit value: 1.6-2.6; when the residual oxygen value is 1.6-3.0, the air-fuel ratio is not adjusted, and the heating furnace normally works;
2) when the residual oxygen value is less than 1.6, the air-fuel ratio is increased by 0.05, the residual oxygen value is observed after the air-fuel ratio is increased by 30 seconds, and if the residual oxygen fluctuates between 1.6 and 2.6, the set value is unchanged; if the residual oxygen value is still less than 1.6, continuously increasing the residual oxygen value by the principle of increasing 0.05, delaying for 30 seconds, and observing the detected residual oxygen value until the residual oxygen value is increased to be between 1.6 and 3.0;
3) when the residual oxygen value is larger than 3.0, the air-fuel ratio is decreased progressively according to 0.03, the time delay is 30 seconds after each decreasing setting, and after the time delay is 30 seconds, if the residual oxygen fluctuates between 1.6 and 3.0, the setting value is unchanged; if the oxygen content is still more than 3.0, continuing to decrease according to the decreasing 0.03 principle until the oxygen content is decreased to be between 1.6 and 3.0.
In the actual production:
when the residual oxygen value was 1.4, the air-fuel ratio was increased by 0.05, the residual oxygen value was observed after 30 seconds, the residual oxygen value was 1.5, the air-fuel ratio was increased by 0.05, and the residual oxygen value was observed after 30 seconds, the residual oxygen value was 1.7, and the set air-fuel ratio was 2: 1.
When the residual oxygen value was observed to be 3.1, the air-fuel ratio was decreased by 0.03, and after 30 seconds, the residual oxygen value was observed, at which time the residual oxygen value was 2.9 and the set air-fuel ratio was 2: 1.
The invention can keep the residual oxygen value in a reasonable range by constantly adjusting the air-fuel ratio, thereby reducing the heat loss and improving the heat efficiency of the heating furnace. And the normal adjustment of the air-fuel ratio of the heating furnace is ensured by temporarily adopting other intact residual oxygen meters.
Claims (1)
1. A method for adjusting the air-fuel ratio of a heating furnace is characterized by comprising the following steps of:
1) the air-fuel ratio set value of the heating furnace is 2:1, air-fuel ratio limit value: 1.6-2.6; when the residual oxygen value is 1.6-3.0, the air-fuel ratio is not adjusted;
2) when the residual oxygen value is less than 1.6, the air-fuel ratio is increased by 0.05, the time is delayed for 30 seconds after each increasing setting, and after the time is delayed for 30 seconds, if the residual oxygen fluctuates between 1.6 and 3.0, the set value is unchanged; if the residual oxygen value is still less than 1.6, continuing to increase the air-fuel ratio by 0.05 until the residual oxygen value is 1.6-3.0;
3) when the residual oxygen value is larger than 3.0, the air-fuel ratio is decreased progressively according to 0.03, the time delay is 30 seconds after each decreasing setting, and after the time delay is 30 seconds, if the residual oxygen fluctuates between 1.6 and 3.0, the setting value is unchanged; if the residual oxygen value is still larger than 3.0, continuing to decrease the air-fuel ratio according to the principle of decreasing by 0.03 until the residual oxygen value is decreased to be between 1.6 and 3.0;
and if a certain residual oxygen meter fails, the detected heating furnace is replaced by the air-fuel ratios of the other heating furnaces, namely the air-fuel ratios of the other heating furnaces are adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610785843.6A CN107782165B (en) | 2016-08-31 | 2016-08-31 | Air-fuel ratio adjusting method for heating furnace |
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| CN201610785843.6A CN107782165B (en) | 2016-08-31 | 2016-08-31 | Air-fuel ratio adjusting method for heating furnace |
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| CN107782165A CN107782165A (en) | 2018-03-09 |
| CN107782165B true CN107782165B (en) | 2020-01-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112325328B (en) * | 2020-10-14 | 2022-10-28 | 首钢京唐钢铁联合有限责任公司 | Residual oxygen amount control method and device for non-direct-fired annealing furnace |
| CN112325327B (en) * | 2020-10-14 | 2022-10-28 | 首钢京唐钢铁联合有限责任公司 | Proportion control type burner residual oxygen amount correction method and device |
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| DE2630746A1 (en) * | 1975-07-08 | 1977-02-03 | Nissan Motor | OXYGEN SENSOR DEVICE |
| CN101684944A (en) * | 2008-09-28 | 2010-03-31 | 宝山钢铁股份有限公司 | Self-optimizing combustion control method of blast-furnace hot blast stove |
| CN101876449A (en) * | 2009-11-17 | 2010-11-03 | 武汉钢铁(集团)公司 | Method of controlling oxygen air-flowing environment in heating furnace |
| CN102364252A (en) * | 2011-11-14 | 2012-02-29 | 北京首钢自动化信息技术有限公司 | Automatic intelligent double cross limiting range combustion control method for heating furnace |
| CN102654286A (en) * | 2012-05-18 | 2012-09-05 | 无锡龙山科技有限公司 | Intelligent dynamic combustion atmosphere controller |
| CN104633698A (en) * | 2014-12-12 | 2015-05-20 | 北京首钢自动化信息技术有限公司 | System and method for automatically controlling content of residual oxygen in regenerative heating furnace |
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2016
- 2016-08-31 CN CN201610785843.6A patent/CN107782165B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2630746A1 (en) * | 1975-07-08 | 1977-02-03 | Nissan Motor | OXYGEN SENSOR DEVICE |
| CN101684944A (en) * | 2008-09-28 | 2010-03-31 | 宝山钢铁股份有限公司 | Self-optimizing combustion control method of blast-furnace hot blast stove |
| CN101876449A (en) * | 2009-11-17 | 2010-11-03 | 武汉钢铁(集团)公司 | Method of controlling oxygen air-flowing environment in heating furnace |
| CN102364252A (en) * | 2011-11-14 | 2012-02-29 | 北京首钢自动化信息技术有限公司 | Automatic intelligent double cross limiting range combustion control method for heating furnace |
| CN102654286A (en) * | 2012-05-18 | 2012-09-05 | 无锡龙山科技有限公司 | Intelligent dynamic combustion atmosphere controller |
| CN104633698A (en) * | 2014-12-12 | 2015-05-20 | 北京首钢自动化信息技术有限公司 | System and method for automatically controlling content of residual oxygen in regenerative heating furnace |
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| 基于连续式燃油加热炉的烟气残氧量模糊控制;刘晓悦,张继德,李晓颖;《微计算机信息》;20060131;全文 * |
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