CN114774677B - Method for quickly heating roasting furnace - Google Patents
Method for quickly heating roasting furnace Download PDFInfo
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- CN114774677B CN114774677B CN202210307953.7A CN202210307953A CN114774677B CN 114774677 B CN114774677 B CN 114774677B CN 202210307953 A CN202210307953 A CN 202210307953A CN 114774677 B CN114774677 B CN 114774677B
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- roasting
- furnace
- roasting furnace
- heating
- pressure
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
- C22B1/04—Blast roasting
Abstract
The invention discloses a rapid heating method of a roasting furnace in the technical field of iron alloy roasting furnace heating, which uses submerged arc furnace gas to heat roasting, ensures that the pressure of each smoke hood of the roasting furnace is slightly positive pressure by adjusting the rotation speed of a fan, the rear section of the roasting furnace blows air into the furnace, the air is further heated and circulated to the front section of the roasting furnace when passing through a burner, the smoke hood and materials are heated, blue carbon powder is evenly thrown into a bedding material, the temperature of the smoke hood is higher than 500 ℃, the submerged arc furnace gas is used for heating roasting, and coke powder is evenly thrown into the bedding material at the same time, and then the pressure in the smoke hood of the roasting furnace is improved by controlling the rotation speed of the fan; the method for quickly heating up of the invention can realize the purposes of quickly heating up the roasting furnace, saving the baking time, improving the equipment operation rate, saving the baking cost and the like by reasonably adding the combustion improver.
Description
Technical Field
The invention relates to the technical field of heating of ferroalloy roasting furnaces, in particular to a rapid heating method of a roasting furnace.
Background
The Tai steel Mo Bang furnace charge limited company uses a roasting furnace technology to produce chrome pellets, the production capacity is 70 ten thousand tons per year, and before 2021, the company strictly follows the Ottotai design specification: the furnace is baked by using the coal gas of the submerged arc furnace-a single heat source. Problems of exposure over long oven times: the temperature rise time after maintenance is more than 50% of the downtime, especially the baking time of the baking furnace is more than 5 days after maintenance in the baking system, so that the production operation rate of the baking system is low, the operation rate in 2020 is only 83.71%, and the development of a technology for quickly heating the baking furnace is urgently needed.
Disclosure of Invention
The invention aims to provide a method for quickly heating a roasting furnace, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: a method for rapidly heating a roasting furnace, which comprises the following steps:
and (3) a step of: heating the roasting furnace by using submerged arc furnace gas at the temperature lower than 400 ℃, ensuring the pressure of each submerged arc furnace gas in the roasting furnace to be micro-positive pressure by adjusting the rotating speed of a fan, blowing air into the furnace from the rear section of the roasting furnace, converting cooling air into hot air after passing through a heated material layer, further heating the hot air when passing through a burner, and then circulating the hot air to the front section of the roasting furnace to heat the submerged arc furnace and materials, thereby realizing the purpose of circulating heating;
and II: the temperature of the fume hood is 400-500 ℃, the submerged arc furnace gas is used for heating roasting, and simultaneously, blue carbon powder is uniformly thrown into the bedding material, and the pressure and the machine speed of the first stage are continuously maintained;
thirdly,: the temperature of the fume hood is higher than 500 ℃, the submerged arc furnace gas is used for heating roasting, coke powder is uniformly thrown into the bedding material at the same time, and then the pressure in the fume hood of the roasting furnace is increased by controlling the rotating speed of a fan;
fourth, the method comprises the following steps: the temperature of the roasting furnace is not increased, pellets are fed into the furnace, and meanwhile, the coke powder is thrown away, and the dosage is the same as that of the third stage until the roasting temperature reaches the production temperature (more than 900 ℃).
Preferably, when the fan rotating speed in the first step ensures that the pressure of the smoke hood is micro positive pressure, the speed of the steel belt is controlled to be 0.4-0.7 m/min.
Preferably, in the second step, when the blue carbon powder is uniformly thrown into the bedding material, the using amount of the blue carbon powder is 4-12 kg/min, the carbon content of the blue carbon powder is 75-80%, the ignition point is 400-550 ℃, and the heat value is 25.1-29.3 MJ/kg.
Preferably, in the third step, when the coke powder is uniformly thrown into the bedding material, the coke powder consumption is 6-15 kg/min, the carbon content of the coke powder is 80-85%, the ignition point is 450-650 ℃, the heat value is 25.1-29.3 MJ/kg, and the fan rotating speed increases the pressure of the roasting furnace smoke hood to about 10Pa.
Preferably, when the rotating speed of the fan increases the pressure of the fume hood of the roasting furnace to about 10Pa, the bottom material spreading and water adding wetting device is opened at the same time, so that the steel belt is protected, and high-temperature damage is avoided.
Compared with the prior art, the invention has the beneficial effects that: according to the rapid heating method of the roasting furnace, the accumulated heating time of the roasting furnace is reduced from about 124 hours to about 9 hours; the furnace drying time is shortened by about 115 hours, and about 9180 tons of pellets can be produced according to the yield of 85 tons of chrome ore pellets per hour.
Description of the embodiments
The following description of the embodiments of the present invention will clearly and fully describe the technical solutions of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
A method for rapidly heating a roasting furnace, which comprises the following steps:
and (3) a step of: heating the roasting furnace by using submerged arc furnace gas at the temperature lower than 400 ℃, ensuring the pressure of each submerged arc furnace gas in the roasting furnace to be micro-positive pressure by adjusting the rotating speed of a fan, blowing air into the furnace from the rear section of the roasting furnace, converting cooling air into hot air after passing through a heated material layer, further heating the hot air when passing through a burner, and then circulating the hot air to the front section of the roasting furnace to heat the submerged arc furnace and materials, thereby realizing the purpose of circulating heating;
and II: the temperature of the fume hood is 400-500 ℃, the submerged arc furnace gas is used for heating roasting, and simultaneously, blue carbon powder is uniformly thrown into the bedding material, and the pressure and the machine speed of the first stage are continuously maintained;
thirdly,: the temperature of the fume hood is higher than 500 ℃, the submerged arc furnace gas is used for heating roasting, coke powder is uniformly thrown into the bedding material at the same time, and then the pressure in the fume hood of the roasting furnace is increased by controlling the rotating speed of a fan;
fourth, the method comprises the following steps: the temperature of the roasting furnace is not increased, pellets are fed into the furnace, and meanwhile, the coke powder is thrown away, and the dosage is the same as that of the third stage until the roasting temperature reaches the production temperature (more than 900 ℃).
A new process is developed, several alternative fuels are preliminarily determined, the carbon content of lignite, long flame coal, anthracite, coke powder, blue carbon powder, sawdust is 60-70%, the ignition point is 270-310 ℃, the heat value is 8.4-16.8 MJ/kg, the carbon content of the long flame coal is 74-92%, the ignition point is 275-320 ℃, the heat value is 20.9-33.5 MJ/kg, the carbon content of the coking coal is 74-92%, the ignition point is 350-370 ℃, the heat value is 20.9-33.5 MJ/kg, the carbon content of the anthracite is 90-98%, the ignition point is 370-420 ℃, and the heat value is 25.1-32.6 MJ/kg.
Preferably, when the fan rotating speed in the first step ensures that the pressure of the smoke hood is micro positive pressure, the speed of the steel belt is controlled to be 0.4-0.7 m/min.
Preferably, in the second step, when the blue carbon powder is uniformly thrown into the bedding material, the using amount of the blue carbon powder is 4-12 kg/min, the carbon content of the blue carbon powder is 75-80%, the ignition point is 400-550 ℃, and the heat value is 25.1-29.3 MJ/kg.
Preferably, in the third step, when the coke powder is uniformly thrown into the bedding material, the coke powder consumption is 6-15 kg/min, the carbon content of the coke powder is 80-85%, the ignition point is 450-650 ℃, the heat value is 25.1-29.3 MJ/kg, and the fan rotating speed increases the pressure of the roasting furnace smoke hood to about 10Pa.
Preferably, when the rotating speed of the fan increases the pressure of the fume hood of the roasting furnace to about 10Pa, the bottom material spreading and water adding wetting device is opened at the same time, so that the steel belt is protected, and high-temperature damage is avoided.
The accumulated heating time of the roasting furnace is reduced from about 124 hours to about 9 hours; the furnace drying time is shortened by about 115 hours, and about 9180 tons of pellets can be produced according to the yield of 85 tons of chrome ore pellets per hour, and the rapid temperature rise method is used for comparing the time of shutdown before and after implementation (see the table below).
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A method for quickly heating up a roasting furnace is characterized in that: the method comprises the following steps:
and (3) a step of: heating the roasting furnace by using submerged arc furnace gas at the temperature lower than 400 ℃, ensuring the pressure of each submerged arc furnace gas in the roasting furnace to be micro-positive pressure by adjusting the rotating speed of a fan, blowing air into the furnace from the rear section of the roasting furnace, converting cooling air into hot air after passing through a heated material layer, further heating the hot air when passing through a burner, and then circulating the hot air to the front section of the roasting furnace to heat the submerged arc furnace and materials, thereby realizing the purpose of circulating heating;
and II: the temperature of the fume hood is 400-500 ℃, the submerged arc furnace gas is used for heating roasting, and simultaneously, blue carbon powder is uniformly thrown into the bedding material, and the pressure and the machine speed of the first stage are continuously maintained;
thirdly,: the temperature of the fume hood is higher than 500 ℃, the submerged arc furnace gas is used for heating roasting, coke powder is uniformly thrown into the bedding material at the same time, and then the pressure in the fume hood of the roasting furnace is increased by controlling the rotating speed of a fan;
fourth, the method comprises the following steps: and after the temperature of the roasting furnace is not increased any more, starting to charge the pellets into the furnace, and simultaneously keeping the throwing of the coke powder, wherein the dosage is the same as that of the third stage, until the roasting temperature reaches the production temperature of more than 900 ℃.
2. The method for rapidly heating up the roasting furnace according to claim 1, wherein the method comprises the following steps: and when the rotating speed of the fan in the first step ensures that the pressure of the smoke hood is micro positive pressure, controlling the speed of the steel belt to be 0.4-0.7 m/min.
3. The method for rapidly heating up the roasting furnace according to claim 1, wherein the method comprises the following steps: and in the second step, when the blue carbon powder is uniformly thrown into the bedding material, the using amount of the blue carbon powder is 4-12 kg/min, the carbon content of the blue carbon powder is 75-80%, the ignition point is 400-550 ℃, and the heat value is 25.1-29.3 MJ/kg.
4. The method for rapidly heating up the roasting furnace according to claim 1, wherein the method comprises the following steps: and in the third step, when coke powder is evenly thrown into the bedding material, the dosage of the coke powder is 6-15 kg/min, the carbon content of the coke powder is 80-85%, the ignition point is 450-650 ℃, the heat value is 25.1-29.3 MJ/kg, and the rotating speed of a fan is used for increasing the pressure of a fume hood of a roasting furnace to 10Pa.
5. The method for quickly heating up the roasting furnace according to claim 4, wherein the method comprises the following steps: when the rotating speed of the fan is increased to 10Pa, the bottom material spreading and water adding wetting device is opened at the same time, so that the steel belt is protected, and high-temperature damage is avoided.
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| CN202210307953.7A CN114774677B (en) | 2022-03-27 | 2022-03-27 | Method for quickly heating roasting furnace |
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| CN114774677B true CN114774677B (en) | 2023-07-04 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4437884A (en) * | 1980-11-10 | 1984-03-20 | Union Oil Company Of California | Ore roasting with recycle of gases |
| CN103911506B (en) * | 2014-04-18 | 2016-10-12 | 长沙有色冶金设计研究院有限公司 | The method of wind concurrent heating roasting decarburization is adjusted in a kind of Carbonaceous gold ore lifting |
| CN104197725B (en) * | 2014-07-31 | 2016-04-13 | 成都易态科技有限公司 | The method of comprehensive utilization of mine heat furnace smelting flue-gas dust removal and purification and sensible heat and latent heat |
| CN104451149B (en) * | 2015-01-07 | 2017-03-08 | 刘培骁 | A kind of hot blast mineral hot furnace |
| CN107987892A (en) * | 2017-11-24 | 2018-05-04 | 重庆大朗冶金新材料有限公司 | Mineral hot furnace coal-gas recovering Application way and equipment |
| CN217173633U (en) * | 2022-05-19 | 2022-08-12 | 山西太钢万邦炉料有限公司 | Device for cleaning gas system on line |
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