CN115682728A - Method for sintering by using fuel gas - Google Patents

Method for sintering by using fuel gas Download PDF

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Publication number
CN115682728A
CN115682728A CN202211307979.8A CN202211307979A CN115682728A CN 115682728 A CN115682728 A CN 115682728A CN 202211307979 A CN202211307979 A CN 202211307979A CN 115682728 A CN115682728 A CN 115682728A
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China
Prior art keywords
sintering
gas
fuel gas
fuel
sintering machine
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CN202211307979.8A
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张同森
高景栋
李文琦
陈小敏
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Gaomi Dongye Engineering Technology Co ltd
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Gaomi Dongye Engineering Technology Co ltd
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Priority to CN202211307979.8A priority Critical patent/CN115682728A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]

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Abstract

The invention provides a method for sintering sintered materials by using fuel gas, which is used for the sintering process of a sintering machine, wherein a fuel gas injection device is arranged at the sintering machine and is communicated with a fuel gas pipeline, and the method comprises the following steps: step 1, feeding a sintering material to be processed into a sintering machine, and starting production by the sintering machine according to a working condition of non-injected fuel gas; step 2, stopping the air driving process after driving the air in the gas pipeline by using nitrogen; step 3, after the sintering machine normally produces, starting a hot air sintering facility, feeding hydrogen-rich gas into the protection cabin, and then properly reducing the proportion of solid fuel in a material distribution chamber of the sintering machine; and 4, operating the opening degree of a gas valve according to the quality of the sinter, and adjusting the opening degree of the gas, so that the invention has the advantages of homogenizing the sinter quality of the upper and lower material layers, saving energy and reducing emission.

Description

Method for sintering by using fuel gas
Technical Field
The invention belongs to the technical field of iron ore agglomeration, and particularly relates to a method for sintering by using fuel gas.
Background
At present, sintering is one of the main processes of iron and steel smelting, and mineral powder is sintered into blocks. The process has huge energy consumption, and occupies about 10 percent of the total energy consumption of the steel industry. At present, solid fuels such as coke powder, anthracite, semi-coke and the like are commonly added in the sintering process at home and abroad, and the components are mainly C, so that low-carbon emission of sintering flue gas cannot be realized, and the aim of 'double-carbon' advocated by the nation is difficult to realize.
Solid fuel can not be completely combusted in the sintering process, and the flue gas of the sintering machine contains-10000 ppMV of CO according to the supply of related data, thereby causing energy waste.
The solid fuel also contains a large amount of N, S elements, and NO and SO are generated in the sintering process 2 And the like, which causes cost pressure and social pressure on the environment protection of the sintering machine.
Therefore, the invention is invented by correcting and improving the above scheme in view of the defects of the actual manufacture and implementation and use, and with the help of professional knowledge and experience, and after many times of ingenuity and experiments, the invention also provides a method for sintering by using gas, which is used for solving the problems of high fuel energy consumption of a sintering machine and SO of the flue gas of the sintering machine 2 High NO and CO contents and environmental protection cost, and low quality and yield of sinter.
Disclosure of Invention
The invention provides a method for sintering by using fuel gas, which solves the problems of high fuel energy consumption of a sintering machine and SO of flue gas of the sintering machine in the prior art 2 High content of NO and CO, high environmental protection cost and low quality and yield of sinter.
The technical scheme of the invention is realized as follows: a method for sintering by using fuel gas is used for a sintering machine to sinter a sintering material, a fuel gas injection device is arranged at the sintering machine, and the fuel gas injection device is communicated with a fuel gas pipeline, and is characterized by comprising the following steps:
step 1, feeding sintered materials to be processed into a sintering machine, and starting production by the sintering machine according to the working condition of non-injected fuel gas;
step 2, stopping the air driving process after driving the air in the gas pipeline by using nitrogen;
step 3, after the sintering machine normally produces, starting a hot air sintering facility, feeding hydrogen-rich gas into the protection cabin, and then properly reducing the proportion of solid fuel in a material distribution chamber of the sintering machine;
and 4, operating the opening of the gas valve according to the quality of the sintered ore, and adjusting the opening of the gas.
When the sintering material to be processed enters the designated position of the sintering machine, the sintering machine starts to start according to the working condition of the non-connected injected gas, then when a gas valve is opened, nitrogen gas at the moment is input into the gas pipeline, mixed gas remained in the gas pipeline is discharged, the process of driving the air is stopped after the air is discharged, then the sintering machine starts to normally start production, hydrogen-rich fuel is conveyed into the protection cabin through the gas pipeline at the moment, the proportioning of the solid fuel is properly changed in the proportioning chamber of the sintering machine according to the quality of sintering ore, the opening degree of the gas valve is operated, and the opening degree of the gas is adjusted.
As a preferable embodiment, the gas valve is disposed at the gas pipeline in step 2, and air in the gas pipeline in the gas circulation direction is driven by nitrogen gas according to the opening or closing of the gas valve, and when the gas valve is opened, the nitrogen gas at that time is input into the gas pipeline, and the mixed gas remaining in the gas pipeline is discharged by the inhibition of the nitrogen gas and the heavier than air, so that the purity of the gas introduced into the sintering machine is high, and the improvement of the quality of the sintered material is promoted.
As a preferred embodiment, after the hot air sintering facility is started to ignite in step 3, gas is blown into the sintering material, the maximum sintering temperature and the quality of the sintering ore are homogenized along the height direction of the sintering material layer, heat is provided for the sintering material through the combustion of the gas to supplement the insufficient heat of the upper layer of the sintering ore, so that the sintering temperature at the upper part of the material layer is increased, the liquid phase quantity is increased, the liquid phase viscosity is reduced, the full crystallization of minerals is facilitated, the content of glass phase is reduced, the yield of the upper layer of the sintering material and the strength of the sintering ore are improved, and the quantity of the sintering minerals of the upper layer and the lower layer is homogenized.
As a preferred embodiment, in the step 3, at the front edge of the combustion zone, when the temperature has not reached the ignition point, with the addition of the fuel gas, a red fire layer at 1250-1300 ℃ of the sintering machine is utilized, and when the fuel gas passes through the red fire layer to burn and release heat to burn CO, the burning speed is far higher than the preheating speed of the solid fuel, so that the combustion is clean, the generation of excessive CO is avoided, the fuel gas is completely burned, the energy consumption of the sintering machine is reduced, and the sintering production cost is reduced; but also reduces harmful emissions.
In a preferred embodiment, the increase and decrease of the fuel in the step 3 are opposite to the increase and decrease of the gas introduction amount, but when the fuel is used more, the gas introduction amount is decreased; of course, when the fuel usage is reduced, the gas introduction amount is increased.
In a preferred embodiment, when the quality of the sintered ore in step 4 is high, the opening degree of the gas valve is small, and the opening degree of the gas is small; when the quality of the sinter is low, the opening degree of the gas valve is larger, and the opening degree of the gas is larger.
In a preferred embodiment, when the internal pressure of the protection cabin is high, the protection cabin is decompressed.
In a preferred embodiment, the fuel gas may be any one of natural gas or coke oven gas.
After the technical scheme is adopted, the invention has the beneficial effects that: the iron ore sintering can be enhanced, and partial coke heat energy can be replaced, so that the solid fuel consumption cost is reduced, and the carbon emission is reduced. The pressure of environmental protection is relieved, the production efficiency is improved, the consumption of solid fuel is reduced fundamentally, the discharge of pollutants and C is reduced, the technical progress of the smelting industry is promoted, and low-carbon metallurgy is realized. Obtaining greater economic benefit and social environmental benefit, and playing a demonstration role in reasonably utilizing the fuel gas of the iron and steel enterprises.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic flow diagram of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a method for sintering by using gas is used in the sintering machine for sintering materials, a gas injection device is arranged at the sintering machine, and the gas injection device is communicated with a gas pipeline, and the method comprises the following steps:
step 1, feeding a sintering material to be processed into a sintering machine, and starting production by the sintering machine according to a working condition of non-injected fuel gas;
step 2, stopping the air driving process after driving the air in the gas pipeline by using nitrogen;
step 3, after the sintering machine normally produces, starting a hot air sintering facility, feeding hydrogen-rich gas into the protection cabin, and then properly reducing the proportion of solid fuel in a material distribution chamber of the sintering machine;
and 4, operating the opening of the gas valve according to the quality of the sintered ore, and adjusting the opening of the gas.
When the sintering material to be processed enters the designated position of the sintering machine, the sintering machine starts to start according to the working condition of the non-connected injected gas, then when a gas valve is opened, nitrogen gas at the moment is input into the gas pipeline, mixed gas remained in the gas pipeline is discharged, the process of driving the air is stopped after the air is discharged, then the sintering machine starts to normally start production, hydrogen-rich fuel is conveyed into the protection cabin through the gas pipeline at the moment, the proportioning of the solid fuel is properly changed in the proportioning chamber of the sintering machine according to the quality of sintering ore, the opening degree of the gas valve is operated, and the opening degree of the gas is adjusted.
The gas valve sets up gas pipeline department in step 2, according to opening or closing of gas valve, utilizes nitrogen gas to drive the air of gas circulation direction in the gas pipeline, when the gas valve was opened, during nitrogen gas was imported the gas pipeline this moment, utilizes nitrogen gas to suppress burning and than the air heavy, discharges remaining mist in the gas pipeline for the gas purity who inserts the sintering machine is high, promotes the sintering material quality and improves.
And 3, after starting a hot air sintering facility for ignition, blowing gas into the sintering material, homogenizing the highest sintering temperature and the quality of the sintering ore along the height direction of the sintering material layer, providing heat for the sintering material through combustion of the gas to supplement the heat of the upper layer of the sintering ore, so that the sintering temperature at the upper part of the material layer is increased, the liquid phase quantity is increased, meanwhile, the liquid phase viscosity is reduced, full crystallization of minerals is facilitated, the content of glass phase is reduced, the yield and the strength of the upper layer of the sintering material are improved, and the sintered mineral quantity of the upper and lower material layers is homogenized.
In the step 3, at the front edge of the combustion zone, when the temperature does not reach the ignition point, a 1250-1300 ℃ red fire layer of the sintering machine is utilized along with the addition of the fuel gas, when the fuel gas passes through the red fire layer to burn and release heat to burn CO, at the moment, the burning speed is far higher than the preheating speed of solid fuel, so that the combustion is clean, the generation of excessive CO is avoided, the fuel gas is completely burned, the energy consumption of the sintering machine is reduced, and the sintering production cost is reduced; but also reduces harmful emissions.
The increase and decrease of the fuel in the step 3 and the increase and decrease of the gas introduction amount are opposite, and the gas introduction amount is reduced when the fuel is used more; of course, when the fuel consumption is reduced, the gas introduction amount is increased.
When the quality of the sintered ore in the step 4 is high, the opening degree of a gas valve is smaller, and the opening degree of gas is smaller; when the quality of the sinter is low, the opening degree of the gas valve is large, and the opening degree of the gas is large.
When the internal pressure of the protection cabin is strong, the pressure of the protection cabin is relieved.
The fuel gas can be any one of natural gas or coke oven gas.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection through an intermediate medium, and those skilled in the art will understand the specific meaning of the terms as they are used in the specific case.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A method for sintering by using fuel gas is used in the process of sintering materials by a sintering machine, a fuel gas injection device is arranged at the sintering machine, and the fuel gas injection device is communicated with a fuel gas pipeline, and is characterized by comprising the following steps:
step 1, feeding a sintering material to be processed into a sintering machine, and starting production by the sintering machine according to a working condition of non-injected fuel gas;
step 2, stopping the air driving process after driving the air in the gas pipeline by using nitrogen;
step 3, after the sintering machine normally produces, starting a hot air sintering facility, feeding hydrogen-rich gas into the protection cabin, and then properly reducing the proportion of solid fuel in a material distribution chamber of the sintering machine;
and 4, operating the opening of the gas valve according to the quality of the sintered ore, and adjusting the opening of the gas.
2. The method for sintering by using fuel gas as claimed in claim 1, wherein a fuel gas valve is provided at the fuel gas pipeline in step 2, and air in the fuel gas pipeline in the fuel gas circulation direction is driven by nitrogen gas according to the opening or closing of the fuel gas valve.
3. The method for sintering by using fuel gas as claimed in claim 1, wherein, after the hot air sintering device is started to ignite in the step 3, fuel gas is blown into the sintering material, and the maximum sintering temperature and the quality of the sintering ore are homogenized along the height direction of the sintering material layer.
4. The method for sintering by using fuel gas as claimed in claim 3, wherein in the step 3, when the temperature at the front edge of the combustion zone does not reach the ignition point, the fuel gas is added, and then the fuel gas burns CO by using 1250-1300 ℃ red fire layer of the sintering machine and releasing heat when passing through the red fire layer.
5. The method for sintering by using fuel gas as claimed in claim 3, wherein the increase and decrease of the fuel in the step 3 are opposite to the increase and decrease of the gas introduction amount.
6. The method for sintering by using gas as claimed in claim 1, wherein in the step 4, when the quality of the sintered ore is high, the opening degree of a gas valve is small, and the opening degree of the gas is small; when the quality of the sinter is low, the opening degree of the gas valve is large, and the opening degree of the gas is large.
7. The method for sintering by using fuel gas as claimed in claim 1, wherein the protection cabin is depressurized when the internal pressure of the protection cabin is high.
8. The method of claim 1, wherein the gas is natural gas or coke oven gas.
CN202211307979.8A 2022-10-24 2022-10-24 Method for sintering by using fuel gas Pending CN115682728A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211307979.8A CN115682728A (en) 2022-10-24 2022-10-24 Method for sintering by using fuel gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211307979.8A CN115682728A (en) 2022-10-24 2022-10-24 Method for sintering by using fuel gas

Publications (1)

Publication Number Publication Date
CN115682728A true CN115682728A (en) 2023-02-03

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Country Status (1)

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