CN111020101A - Method for controlling recovery termination of converter gas - Google Patents
Method for controlling recovery termination of converter gas Download PDFInfo
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- CN111020101A CN111020101A CN201911209969.9A CN201911209969A CN111020101A CN 111020101 A CN111020101 A CN 111020101A CN 201911209969 A CN201911209969 A CN 201911209969A CN 111020101 A CN111020101 A CN 111020101A
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- Prior art keywords
- coal gas
- recovery
- oxygen content
- oxygen
- gas recovery
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C2100/00—Exhaust gas
- C21C2100/04—Recirculation of the exhaust gas
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a method for controlling the recovery termination of converter gas, which comprises the following steps: when any one of the following conditions for terminating the coal gas recovery is met, terminating the coal gas recovery; the conditions for terminating the coal gas recovery are as follows: starting timing after the blowing of the oxygen of the rotation furnace is stopped, and stopping coal gas recovery when the timing duration meets the set delay condition; or stopping blowing the oxygen from the rotary furnace, and stopping gas recovery when the oxygen content in the gas recovery process reaches the set oxygen content condition. The method aims to increase the recovery amount of coal gas, reduce the waste degree of energy and improve the utilization rate of resources.
Description
Technical Field
The invention relates to the field of automatic control of a gas recovery system, in particular to a method for controlling the termination of gas recovery of a converter.
Background
The coal gas recovery is an important process of a steelmaking converter smelting byproduct collecting and dust removing purification system, and the converter coal gas is recovered and then stored in a coal gas cabinet of a power energy source part in stages and then is conveyed to a coal gas user, so that the energy recycling is realized. The converter smelting generates a large amount of flue gas which is complex in composition and contains various gases such as carbon monoxide, carbon dioxide, oxygen, nitrogen and the like, an electrostatic dust collector is arranged behind an outlet of a gas cabinet of a company to further purify the output gas, and for safety, a multiple safety interlocking program is arranged in a gas recovery process, wherein the interlocking program for stopping the gas recovery is that oxygen of the converter stops blowing and oxygen is closed, namely the gas stops being recovered and is transferred to be diffused when oxygen blowing is finished. However, when the converter stops blowing, the flue still contains more recoverable carbon monoxide, and the carbon monoxide is not recycled because the blowing is stopped and the carbon monoxide is released (the coal gas is stopped being recovered and transferred to be released when the oxygen blowing is finished), so that energy waste exists, the coal gas recovery time is influenced, and the recovery amount of per ton of steel gas is low.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention at least aims to provide a method for controlling the termination of gas recovery in a converter, which aims to increase the recovery of gas, reduce the waste of energy and improve the utilization rate of resources.
To achieve the above and other related objects, one embodiment of the present invention provides a method for controlling termination of converter gas recovery, comprising the steps of:
when any one of the following conditions for terminating the coal gas recovery is met, terminating the coal gas recovery;
the conditions for terminating the coal gas recovery are as follows:
starting timing after the blowing of the oxygen of the rotation furnace is stopped, and stopping coal gas recovery when the timing duration meets the set delay condition;
or
And after the blowing of the oxygen of the rotation furnace is stopped, when the oxygen content in the coal gas recovery process reaches the set oxygen content condition, the coal gas recovery is stopped.
Optionally, the delay setting condition is 17S-60S.
Optionally, the delay setting condition is 20S.
Optionally, the oxygen content setting conditions are: 1 percent.
Optionally, the determining of the delay setting condition includes:
acquiring data of relevant index information in the recovered coal gas from past historical data when the coal gas stops being recovered and is switched to a diffusion mode when oxygen stops blowing and the coal gas is recovered;
and acquiring the maximum value and the minimum value of the time when the oxygen content in the recovered coal gas reaches the oxygen content setting condition according to the data of the relevant index information, thereby determining the delay setting condition.
Optionally, the relevant index information includes:
oxygen content, and the time length from the beginning of oxygen blowing to the time when the set oxygen content condition is reached.
Optionally, the relevant index information further includes:
the duration of the coal gas recovery process, the carbon monoxide content and the carbon monoxide content when the oxygen content reaches the set oxygen content.
According to the technical scheme provided by the embodiment of the invention, the recovery time of each furnace is prolonged by improving the recovery time of each furnace, so that the total recovery amount of each furnace gas is increased, and the energy consumption of the converter process and the cost can be reduced by increasing the recovery amount of each ton of steel gas.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
A method of controlling termination of converter gas recovery, comprising the steps of:
when any one of the following conditions for terminating the coal gas recovery is met, terminating the coal gas recovery;
the conditions for terminating the coal gas recovery are as follows:
starting timing after the blowing of the oxygen of the rotation furnace is stopped, and stopping coal gas recovery when the timing duration meets the set delay condition;
or
And after the blowing of the oxygen of the rotation furnace is stopped, when the oxygen content in the coal gas recovery process reaches the set oxygen content condition, the coal gas recovery is stopped. The coal gas in the coal gas recovery process refers to the coal gas which is not recovered to the coal gas cabinet in the pipeline when the coal gas recovery is not finished. The pipeline is connected with a gas tank, and gas flows to the gas tank through the pipeline.
The technical scheme of the invention abandons the working mode of blowing-out and blowing-out (the coal gas stops being recovered and is converted into blowing-out when the oxygen blowing is finished), the coal gas recovery is stopped through time delay setting or when the oxygen content in the coal gas reaches the oxygen content setting condition, and the recovery time of each furnace of the coal gas recovery is increased, so that the recovery total amount of each furnace coal gas is increased, the recovery amount of steel gas per ton can reduce the energy consumption of the converter process and the cost.
In one embodiment, the delay setting condition is 17S to 60S. The delay time is set to be 17-60S, so that the total recovery amount of each furnace gas can be safely and effectively increased.
In one embodiment, the delay setting condition is 20S. The time delay condition is set to be 20 seconds, and the gas recovery time per furnace is at least increased by nS (n is less than or equal to 20, so less than 20 because the gas recovery termination condition also comprises the limitation of the oxygen content, the time length of each time the oxygen content reaches the set condition is not uniform, and sometimes the time of the oxygen content reaching the set condition is less than 20, so n is less than 20).
In one embodiment, where n is 15, there are: according to the calculation of 13 minutes of blowing, 600 seconds of gas recovery and 146 tons of steel tapping amount in each furnace, 146/600-0.24 ton of gas generated by molten steel is recovered every second; after improvement, 15 x 0.24-3.65 tons of coal gas generated by molten steel can be added in each furnace; the average production of 90 furnaces is calculated by 2 converters per day, namely 3.65 x 90-328.5 tons of coal gas generated by molten steel per day can be increased, and the equivalent is that 328.5/146-2.25 furnaces are recovered more per day.
In one embodiment, the oxygen content setting conditions are: 1 percent. The oxygen content setting condition is positioned by 1 percent, so that the occurrence probability of explosion can be effectively reduced, and the safety is ensured.
In one embodiment, the determining of the delay setting condition includes:
acquiring data of relevant index information in the recovered coal gas from past historical data when the coal gas stops being recovered and is switched to a diffusion mode when oxygen stops blowing and the coal gas is recovered; past historical data refers to: relevant data recorded in previous production. The gas that has been recovered refers to: and after the oxygen of the converter stops blowing, the coal gas in the gas holder.
And acquiring the maximum value and the minimum value of the time when the oxygen content in the recovered coal gas reaches the oxygen content setting condition according to the data of the relevant index information, thereby determining the delay setting condition.
In one embodiment, the relevant index information includes:
oxygen content, and the time length from the beginning of oxygen blowing to the time when the set oxygen content condition is reached.
In one embodiment, the relevant index information further includes:
the duration of the coal gas recovery process, the carbon monoxide content and the carbon monoxide content when the oxygen content reaches the set oxygen content.
In one embodiment, the relevant index information further includes:
average value of carbon monoxide content when oxygen gas exceeds the set oxygen content (1%).
In particular, the amount of the solvent to be used,
1. the method comprises the following steps of (1) arranging data according to a new line converter gas recovery trend graph (the gas recovery trend graph is a data set recorded by a gas recovery system in the conventional gas recovery process), focusing smoke components and duration when recovery is stopped, and comprising the following steps: the duration of the gas recovery process (to the nearest second), the carbon monoxide content, the oxygen content, the duration of the oxygen content to 1% (to the nearest second), the carbon monoxide content at the oxygen content to 1%, the duration of the oxygen content from < 1% to 1% (to the nearest second). It is noted that the oxygen content is gradually reduced along with the time when oxygen is blown in the coal gas recovery process; after oxygen withdrawal, the oxygen content gradually increased over time. The starting point of the time period during which the oxygen content reached 1% was when oxygen blowing was started.
2. Because the form cannot be exported by the current gas recovery trend graph, the data need to be traced and recorded one by one according to the trend graph. The following results were recorded: the CO content averaged 41.6% (up to 65.4%) when oxygen was turned off; the CO content averaged 26.3% (up to 52.3%) with oxygen over 1%; the number of seconds duration averages 50 seconds (17 seconds minimum).
As can be seen from the average CO content of 26.3% (up to 52.3%) when the oxygen content exceeds 1%, the carbon monoxide content is still high even if the oxygen content exceeds 1%, i.e., heat loss is severe, in the mode in which the oxygen gas recovery, i.e., termination, is turned off.
3. The data demonstrate that shutting off the oxygen gas recovery, i.e., stopping, causes a portion of the high heating value gas to diffuse and requires approximately 1 minute to reach an oxygen content of 1%. The above can be realized by modifying the program to set a delay after turning off the oxygen to continue to recover the gas, for example, to set the delay to 20 seconds.
4. Modifying the coal gas recovery program according to the management flow 2:
stopping the gas recovery after the blowing of the converter is stopped and delaying for 20 seconds;
stopping gas recovery when the oxygen content reaches 1%;
therefore, the oxygen content is not more than 1%, and the coal gas can be recovered in a delayed time.
It should be noted that the content described in the present invention is a volume/mole percentage content.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A method of controlling termination of gas recovery in a converter, comprising the steps of:
when any one of the following conditions for terminating the coal gas recovery is met, terminating the coal gas recovery;
the conditions for terminating the coal gas recovery are as follows:
starting timing after the blowing of the oxygen of the rotation furnace is stopped, and stopping coal gas recovery when the timing duration meets the set delay condition;
or
And after the blowing of the oxygen of the rotation furnace is stopped, when the oxygen content in the coal gas recovery process reaches the set oxygen content condition, the coal gas recovery is stopped.
2. The method for controlling the termination of the recovery of converter gas according to claim 1, wherein the delay time setting condition is 17S to 60S.
3. The method for controlling the termination of the recovery of converter gas according to claim 2, wherein the delay time setting condition is 20S.
4. The method for controlling the termination of the recovery of converter gas according to claim 1, wherein the oxygen content setting conditions are as follows: 1 percent.
5. The method for controlling the termination of the recovery of converter gas according to claim 1, wherein the delay setting condition is determined by the steps of:
acquiring data of relevant index information in the recovered coal gas from past historical data when the coal gas stops being recovered and is switched to a diffusion mode when oxygen stops blowing and the coal gas is recovered;
and acquiring the maximum value and the minimum value of the time when the oxygen content in the recovered coal gas reaches the oxygen content setting condition according to the data of the relevant index information, thereby determining the delay setting condition.
6. The method for controlling the termination of the recovery of converter gas according to claim 5, wherein the related index information comprises:
oxygen content, and the time length from the beginning of oxygen blowing to the time when the set oxygen content condition is reached.
7. The method of claim 6, wherein the related indicator information further comprises:
the duration of the coal gas recovery process, the carbon monoxide content and the carbon monoxide content when the oxygen content reaches the set oxygen content.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911209969.9A CN111020101A (en) | 2019-11-29 | 2019-11-29 | Method for controlling recovery termination of converter gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911209969.9A CN111020101A (en) | 2019-11-29 | 2019-11-29 | Method for controlling recovery termination of converter gas |
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| CN111020101A true CN111020101A (en) | 2020-04-17 |
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| CN201911209969.9A Pending CN111020101A (en) | 2019-11-29 | 2019-11-29 | Method for controlling recovery termination of converter gas |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB995857A (en) * | 1961-02-10 | 1965-06-23 | Yawata Iron & Steel Co | Method for recovering waste gas in unburned state from an oxygen top blowing converter |
| JP2012102367A (en) * | 2010-11-10 | 2012-05-31 | Nippon Steel Corp | Device and method for recovering converter exhaust gas |
| CN105779683A (en) * | 2014-12-23 | 2016-07-20 | 鞍钢股份有限公司 | Recovery system and recovery method for converter gas |
| CN105986056A (en) * | 2015-02-04 | 2016-10-05 | 北京博鹏蓝天环保设备有限公司 | Technology for utilizing sintered plate dust remover in converter wet dust removal system |
| CN107523663A (en) * | 2017-07-31 | 2017-12-29 | 河钢股份有限公司邯郸分公司 | A kind of control method of RECOVERY OF CONVERTER GAS |
| CN110129511A (en) * | 2019-04-19 | 2019-08-16 | 首钢京唐钢铁联合有限责任公司 | A method of improving RECOVERY OF CONVERTER GAS amount and calorific value |
-
2019
- 2019-11-29 CN CN201911209969.9A patent/CN111020101A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB995857A (en) * | 1961-02-10 | 1965-06-23 | Yawata Iron & Steel Co | Method for recovering waste gas in unburned state from an oxygen top blowing converter |
| JP2012102367A (en) * | 2010-11-10 | 2012-05-31 | Nippon Steel Corp | Device and method for recovering converter exhaust gas |
| CN105779683A (en) * | 2014-12-23 | 2016-07-20 | 鞍钢股份有限公司 | Recovery system and recovery method for converter gas |
| CN105986056A (en) * | 2015-02-04 | 2016-10-05 | 北京博鹏蓝天环保设备有限公司 | Technology for utilizing sintered plate dust remover in converter wet dust removal system |
| CN107523663A (en) * | 2017-07-31 | 2017-12-29 | 河钢股份有限公司邯郸分公司 | A kind of control method of RECOVERY OF CONVERTER GAS |
| CN110129511A (en) * | 2019-04-19 | 2019-08-16 | 首钢京唐钢铁联合有限责任公司 | A method of improving RECOVERY OF CONVERTER GAS amount and calorific value |
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Application publication date: 20200417 |
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