CN111118241A - Flue gas furnace cooling device for blast furnace coal injection and control method thereof - Google Patents
Flue gas furnace cooling device for blast furnace coal injection and control method thereof Download PDFInfo
- Publication number
- CN111118241A CN111118241A CN202010048604.9A CN202010048604A CN111118241A CN 111118241 A CN111118241 A CN 111118241A CN 202010048604 A CN202010048604 A CN 202010048604A CN 111118241 A CN111118241 A CN 111118241A
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- Prior art keywords
- flue gas
- gas furnace
- valve
- furnace
- cut
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
Abstract
The invention discloses a flue gas furnace cooling device for coal injection of a blast furnace and a control method thereof, belonging to the technical field of ferrous metallurgy. According to the control method, a flue gas furnace cooling device is additionally arranged in the existing coal powder preparation device, and cold air is blown into the flue gas furnace by a combustion fan to cool the flue gas furnace from a working temperature state to a room temperature state. The invention can realize the purposes of greatly shortening the cooling time of the flue gas furnace and correspondingly prolonging the maintenance time of the flue gas furnace, and effectively solves the problem that the production is influenced by the long cooling time of the flue gas furnace of the powder making system in the existing blast furnace coal injection process.
Description
Technical Field
The invention belongs to the technical field of blast furnace ironmaking coal injection in the ferrous metallurgy industry, and particularly relates to a flue gas furnace cooling device for blast furnace coal injection and a control method thereof.
Background
The blast furnace coal injection is an important technology for greatly reducing the coke ratio and changing the energy structure for the blast furnace in the modern blast furnace iron-making process, and the flue gas furnace is key equipment for the blast furnace coal injection and pulverization process. In production, the flue gas furnace provides dry gas for a blast furnace coal injection and milling process, and the pulverized coal ground by the coal mill is dried and conveyed to prepare the pulverized coal meeting the requirements of the blast furnace coal injection process. When the flue gas furnace breaks down due to factors such as falling of refractory materials in the furnace or damage of a burner and the like, the maintenance is needed to recover the production as soon as possible so as to ensure the requirement of pulverized coal injection of the blast furnace. Because the temperature of the drying gas is between 200 and 350 ℃ in the actual production, the flue gas furnace needs to be cooled to room temperature before the coal mill, the flue gas furnace and other equipment are overhauled. At present, the cooling mode of the flue gas furnace is mainly natural cooling or air cooling is introduced into a burner of the flue gas furnace, the flow of cold air at the burner is limited due to the smaller pipe diameter, the time consumption of the cooling process of a hearth is longer, the overhaul time of the flue gas furnace is correspondingly reduced to a certain extent, and the recovery of production as soon as possible is not facilitated, so that pulverized coal injection of a blast furnace is influenced.
Disclosure of Invention
In view of the above, the present invention provides a cooling device for a flue gas furnace for coal injection of a blast furnace and a control method thereof, which are used for solving the problem that the cooling time of the flue gas furnace is long to affect the smooth production.
The invention is realized by the following technical scheme:
the invention provides a flue gas furnace cooling device for coal injection of a blast furnace, which comprises a combustion-supporting fan, a combustion-supporting pipeline, a flue gas furnace and a third stop valve, wherein an air pipeline which is connected with the combustion-supporting fan and is parallel to the combustion-supporting pipeline is arranged on one side of the flue gas furnace close to a burner, a diffusion pipeline is arranged on one side far away from the burner, a first stop valve is arranged on the air pipeline, and a second stop valve is arranged on the diffusion pipeline.
Further, the first cut-off valve, the second cut-off valve and the third cut-off valve are all electric valves.
Furthermore, a temperature sensor is also arranged on the smoke furnace.
Furthermore, the air pipeline is arranged around the flue gas furnace by a circle, and a plurality of branch pipes connected with a hearth of the flue gas furnace are arranged on the air pipeline.
Further, the ports of the branch pipes on the hearth side of the flue gas furnace have the same inclination.
Further, the air pipeline is also connected with an atomizing device.
The invention is based on the control method of the flue gas furnace cooling device for blast furnace coal injection, which comprises the following steps:
closing the third cut-off valve and starting a combustion-supporting fan;
sequentially opening a second cut-off valve on the bleeding pipeline and a first cut-off valve on the air pipeline;
blowing cold air into the flue gas furnace by a combustion fan, taking the cold air as a cooling medium, and cooling the flue gas furnace from a working temperature state to a room temperature state by utilizing the low-temperature characteristic of the cold air;
and when the temperature in the flue gas furnace is reduced to the room temperature, the combustion-supporting fan, the first cut-off valve and the second cut-off valve are closed in sequence.
Preferably: the temperature in the flue gas furnace is controlled under the feedback regulation action of the temperature sensor, the first cut-off valve and the second cut-off valve, and the range of the temperature in the flue gas furnace is less than or equal to 350 ℃.
The invention has the advantages that:
1. the invention can realize the purposes of greatly shortening the cooling time of the flue gas furnace and correspondingly prolonging the maintenance time of the flue gas furnace, and effectively solves the problem that the production is influenced by the long cooling time of the flue gas furnace of the powder making system in the existing blast furnace coal injection process.
2. The invention utilizes cold air as medium to cool the flue gas furnace, and has the benefits of energy saving and environmental protection.
3. The invention has simple structure, reliable technology, easy realization, low investment cost and obvious technical and economic benefits.
4. The invention can improve the automation control level of the coal injection system and reduce the workload of operators.
5. The invention can implement the improvement of the powder making system of the existing blast furnace coal injection process, and has wide application range.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is another schematic view of the air duct of the present invention;
FIG. 3 is a schematic view of another embodiment of the cooling apparatus of the present invention;
reference numerals: 1-combustion-supporting fan, 2-combustion-supporting pipeline, 3-air pipeline, 4-first cut-off valve, 5-flue gas furnace, 6-discharge pipeline, 7-second cut-off valve, 8-temperature sensor, 9-third cut-off valve, 10-coal grinding machine, 11-coal feeding machine, 12-raw coal bunker, 13-cloth bag powder collecting device, 14-vibrating screen, 15-coal powder bunker and 16-powder discharge fan; 31-branch pipe; 32-atomizing device.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
As shown in fig. 1, the coal injection process system of the flue gas furnace cooling device for blast furnace coal injection comprises: the main process equipment such as combustion-supporting fan 1, combustion-supporting pipeline 2, the flue gas stove 5, third trip valve 9, the coal pulverizer 10, feeder 11, former coal bunker 12, powder ware 13 is received to the sack, shale shaker 14, coal bunker 15 and row's powder fan 16, and this cooling device comprises air conduit 3, first shut-off valve 4, diffuse pipeline 6 and second trip valve 7, 3 one end of air conduit links to each other with combustion-supporting fan 1 export, the other end links to each other with 5 furnace of flue gas stove, and set up side by side with combustion-supporting pipeline 2, be equipped with first shut-off valve 4 on the air conduit 3, be equipped with second trip valve 7 on the pipeline 6 of diffusing. By adopting the scheme, the cold air is used as the medium to cool the flue gas furnace, so that the energy-saving and environment-friendly benefits are achieved, the purposes of greatly shortening the cooling time of the flue gas furnace and correspondingly prolonging the overhaul time of the flue gas furnace can be achieved, and the problem that the production is influenced by the long cooling time of the flue gas furnace of the powder making system in the existing blast furnace coal injection process is effectively solved.
In this embodiment, the first cut-off valve 4, the second cut-off valve 7, and the third cut-off valve 9 are all electrically operated valves. So as to realize automatic control. In order to ensure the normal operation of the flue gas furnace and prevent the misoperation of the electric valve, manual gates can be arranged on the air pipeline and the diffusing pipeline.
In this embodiment, the flue gas furnace 5 is further provided with a temperature sensor 8. The device is used for acquiring the furnace temperature change condition in the cooling process of the flue gas furnace so as to adjust the air quantity of the combustion-supporting fan and the opening sizes of the first cut-off valve and the second cut-off valve and achieve the purpose of rapidly reducing the furnace temperature of the flue gas furnace.
As shown in FIG. 2, the air duct 3 in another embodiment is disposed around the flue gas furnace 5, and has a plurality of branch pipes 31 connected to the furnace of the flue gas furnace 6, and the ports of the plurality of branch pipes 31 on the furnace side of the flue gas furnace 5 have the same inclination. Like this, improve into annular inlet duct to single air conduit for the air inlet is a plurality of, stirs its interior flow direction in the flue gas stove, reaches quick heat extraction purpose.
As shown in fig. 3, the air duct 3 in another embodiment is further connected with an atomizing device 32. Therefore, the entering cold air can be humidified, so that the moisture-containing air entering the smoke furnace is gasified by the temperature in the furnace in the hearth to take away a large amount of heat; thereby, the cooling time of the flue gas furnace is accelerated.
The following describes in detail the specific operation of the flue gas furnace cooling control method implemented in conjunction with the above flue gas furnace cooling apparatus.
According to the cooling control method for the blast furnace coal injection flue gas furnace, when a fault occurs in the normal production process of the flue gas furnace 5 and needs to be maintained, the third cut-off valve 9 is closed firstly to disconnect the flue gas furnace from a coal mill, then the combustion-supporting fan 1 is started, and then the second cut-off valve 7 on a flue gas furnace release pipeline and the first cut-off valve 4 on the air pipeline 3 are opened in sequence; at the moment, the two parts of cooling air are received in the flue gas furnace, firstly, the combustion-supporting fan enters the hearth of the flue gas furnace from the burner of the flue gas furnace through the combustion-supporting pipeline, secondly, the combustion-supporting fan directly enters the hearth of the flue gas furnace through the air pipeline, thus, the two parts of cooling air form cold air flow in the flue gas furnace and are discharged through the diffusing pipeline to take away high-temperature flue gas in the furnace, when the temperature in the flue gas furnace is reduced to the room temperature, and under the feedback regulation of the temperature sensor 8, the combustion-supporting fan, the first cut-off valve and the second cut-off valve are sequentially closed, and the rapid cooling of the flue gas furnace.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it is apparent that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. The utility model provides a blast furnace is flue gas furnace cooling device for coal injection, includes combustion fan (1), combustion-supporting pipeline (2), flue gas furnace (5) and third trip valve (9), its characterized in that, on the flue gas furnace and be close to nozzle one side be equipped with combustion fan be connected and with combustion-supporting pipeline abreast air conduit (3), keep away from nozzle one side and be equipped with diffuse pipeline (6), the last first shut-off valve (4) that is equipped with of air conduit, be equipped with second trip valve (7) on the diffuse pipeline.
2. The cooling device of the gas furnace for coal injection of the blast furnace according to claim 1, wherein the first shut-off valve, the second shut-off valve and the third shut-off valve are electrically operated valves.
3. The cooling apparatus for a blast furnace coal injection flue gas furnace according to claim 1, wherein a temperature sensor (8) is further provided in the flue gas furnace.
4. The cooling apparatus for a gas furnace for injecting pulverized coal into a blast furnace as claimed in claim 1, wherein said air duct is provided around the circumference of the gas furnace, and is provided with a plurality of branch pipes (31) connected to the furnace space of the gas furnace.
5. The cooling apparatus for a blast furnace coal injection flue gas furnace of claim 4, wherein the ports of the plurality of branch pipes on the hearth side of the flue gas furnace have the same inclination.
6. The cooling device of a blast furnace coal injection flue gas furnace of claim 1, wherein an atomization device is further connected to the air duct.
7. The method for controlling the cooling apparatus of the blast furnace coal injection flue gas furnace according to any one of claims 1 to 6, comprising the steps of:
closing the third cut-off valve and starting a combustion-supporting fan;
sequentially opening a second cut-off valve on the bleeding pipeline and a first cut-off valve on the air pipeline;
blowing cold air into the flue gas furnace by a combustion fan, taking the cold air as a cooling medium, and cooling the flue gas furnace from a working temperature state to a room temperature state by utilizing the low-temperature characteristic of the cold air;
and when the temperature in the flue gas furnace is reduced to the room temperature, the combustion-supporting fan, the first cut-off valve and the second cut-off valve are closed in sequence.
8. The control method according to claim 7, characterized in that: the temperature in the flue gas furnace is controlled under the feedback regulation action of the temperature sensor, the first cut-off valve and the second cut-off valve, and the range of the temperature in the flue gas furnace is less than or equal to 350 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010048604.9A CN111118241A (en) | 2020-01-16 | 2020-01-16 | Flue gas furnace cooling device for blast furnace coal injection and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010048604.9A CN111118241A (en) | 2020-01-16 | 2020-01-16 | Flue gas furnace cooling device for blast furnace coal injection and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111118241A true CN111118241A (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010048604.9A Pending CN111118241A (en) | 2020-01-16 | 2020-01-16 | Flue gas furnace cooling device for blast furnace coal injection and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114440616A (en) * | 2022-02-08 | 2022-05-06 | 鞍钢集团工程技术有限公司 | Process and system for drying lump ore by blast of blast furnace |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105886682A (en) * | 2015-01-26 | 2016-08-24 | 鞍钢股份有限公司 | Safety interlocking method of coal dust making system |
| CN106439885A (en) * | 2016-09-28 | 2017-02-22 | 江苏省冶金设计院有限公司 | Raw coal direct blowing type pulverizing device |
| CN211546586U (en) * | 2020-01-16 | 2020-09-22 | 中冶赛迪工程技术股份有限公司 | Flue gas furnace cooling device for coal injection of blast furnace |
-
2020
- 2020-01-16 CN CN202010048604.9A patent/CN111118241A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105886682A (en) * | 2015-01-26 | 2016-08-24 | 鞍钢股份有限公司 | Safety interlocking method of coal dust making system |
| CN106439885A (en) * | 2016-09-28 | 2017-02-22 | 江苏省冶金设计院有限公司 | Raw coal direct blowing type pulverizing device |
| CN211546586U (en) * | 2020-01-16 | 2020-09-22 | 中冶赛迪工程技术股份有限公司 | Flue gas furnace cooling device for coal injection of blast furnace |
Non-Patent Citations (1)
| Title |
|---|
| 方久文等, 江西科学技术出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114440616A (en) * | 2022-02-08 | 2022-05-06 | 鞍钢集团工程技术有限公司 | Process and system for drying lump ore by blast of blast furnace |
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Address after: 400013 No. 1, Shuang Steel Road, Yuzhong District, Chongqing, China Applicant after: CISDI ENGINEERING Co.,Ltd. Applicant after: MCC CCID information technology (Chongqing) Co.,Ltd. Address before: 400013 No. 1, Shuang Steel Road, Yuzhong District, Chongqing, China Applicant before: CISDI ENGINEERING Co.,Ltd. Applicant before: CISDI CHONGQING INFORMATION TECHNOLOGY Co.,Ltd. |
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