CN114774606A - Blast furnace hot blast stove changing and pressure equalizing method - Google Patents
Blast furnace hot blast stove changing and pressure equalizing method Download PDFInfo
- Publication number
- CN114774606A CN114774606A CN202210189297.5A CN202210189297A CN114774606A CN 114774606 A CN114774606 A CN 114774606A CN 202210189297 A CN202210189297 A CN 202210189297A CN 114774606 A CN114774606 A CN 114774606A
- Authority
- CN
- China
- Prior art keywords
- hot blast
- waste gas
- blast stove
- pressure
- preorder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000002912 waste gas Substances 0.000 claims abstract description 65
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/64—Controlling the physical properties of the gas, e.g. pressure or temperature
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to a blast furnace hot blast stove changing and pressure equalizing method, which comprises the steps of feeding waste gas of a preorder hot blast stove into a subsequent hot blast stove, and realizing rapid pressure equalizing between 2 hot blast stoves by utilizing the flow and the pressure of the waste gas of the preorder hot blast stove; when the pressure of the front-sequence hot blast stove and the pressure of the rear-sequence hot blast stove tend to be balanced, the pressure of the rear-sequence hot blast stove is continuously equalized by cold air until the pressure equalizing process is finished; the residual waste gas of the blast furnace is discharged by a chimney. The invention utilizes the flow rate and pressure of waste gas generated by the preceding hot blast stove in the furnace changing process to carry out pressure equalizing on the following hot blast stove, thereby not only reducing the waste gas emission and the air volume loss, but also reducing the fluctuation of the blast furnace air pressure and ensuring the smooth operation of the blast furnace.
Description
Technical Field
The invention relates to the technical field of blast furnace iron making, in particular to a method for changing and equalizing pressure of a blast furnace hot blast stove.
Background
Each blast furnace is generally provided with 3 or 4 hot blast stoves, the working state of each hot blast stove is circulated in a combustion-air supply-combustion-air supply mode, and each hot blast stove alternately supplies air to the blast furnace.
When the hot blast stove is switched from an air supply state to a combustion state (namely, stove change) each time, the waste gas with the pressure of about 0.4MPa in the hot blast stove is directly discharged into the atmosphere through a chimney by a flue valve, and the waste of a heat source is caused by basically needing to be discharged once every hour according to the stove change interval of the hot blast stove. Meanwhile, when the hot blast stove is switched to an air supply state (namely, the stove is changed) from a combustion state at each time, cold air of a blast furnace blower needs to be utilized for carrying out pressure equalization on the hot blast stove, and in the pressure equalization process, the blast pressure of the blast furnace can generate certain fluctuation, so that the stability of the blast furnace operation is directly influenced.
Disclosure of Invention
The invention provides a blast furnace hot blast furnace changing pressure equalizing method, which utilizes the flow and pressure of waste gas generated by a preorder hot blast furnace in the furnace changing process to equalize the pressure of a subsequent hot blast furnace, thereby reducing the waste gas emission and the air volume loss, reducing the fluctuation of the blast furnace air pressure and ensuring the smooth operation of the blast furnace.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for changing and equalizing pressure of a blast furnace hot blast stove comprises the following steps:
1) each hot blast stove is respectively provided with a waste gas branch pipe which is connected with a waste gas main pipe leading to the chimney, and each waste gas branch pipe is respectively provided with a waste gas valve; the main waste gas valve is arranged at the position, close to the chimney, of the main waste gas pipe and is in a normally closed state during normal production;
2) before the exhaust gas is discharged from the preorder hot blast stove which is ready to enter the combustion stage in the air supply stage, opening another exhaust gas valve corresponding to the postorder hot blast stove which is ready to enter the air supply stage in the combustion stage, and then opening the exhaust gas valve corresponding to the preorder hot blast stove;
3) waste gas of the preorder hot blast stove enters a subsequent hot blast stove, and the flow and the pressure of the waste gas of the preorder hot blast stove are utilized to realize rapid pressure equalization among 2 hot blast stoves;
4) when the pressures of the front-sequence hot blast stove and the subsequent hot blast stove tend to be balanced, a waste gas valve corresponding to the subsequent hot blast stove is closed, then a cold air pressure equalizing valve corresponding to the subsequent hot blast stove is opened, and the cold air continues to equalize the pressure until the pressure equalizing process is finished; opening the cold air pressure equalizing valve, simultaneously opening the waste gas main valve, discharging the residual waste gas of the preorder hot blast stove through a chimney, and finally closing the waste gas valve and the waste gas main valve corresponding to the preorder hot blast stove.
Compared with the prior art, the invention has the beneficial effects that:
the pressure equalizing is carried out on the subsequent hot blast furnace by utilizing the flow and the pressure of the waste gas generated by the previous hot blast furnace in the furnace changing process, thereby not only reducing the waste gas emission and the air volume loss, but also reducing the fluctuation of the blast furnace air pressure and ensuring the smooth operation of the blast furnace.
Drawings
FIG. 1 is a first schematic view showing the flow direction of combustion exhaust gas from a blast furnace hot blast stove according to the present invention.
FIG. 2 is a schematic view showing the flow direction of the combustion exhaust gas of the blast furnace hot blast stove according to the present invention.
In the figure: 1. a preorder hot-blast stove 2, a postorder hot-blast stove 3, a waste gas main pipe 4, a chimney 5, a waste gas valve 6 and a waste gas main valve
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
the invention relates to a furnace-changing and pressure-equalizing method for a blast furnace hot blast stove, which comprises the following steps:
1) each hot blast stove is respectively provided with a waste gas branch pipe which is connected with a waste gas main pipe 3 leading to a chimney 4, and each waste gas branch pipe is respectively provided with a waste gas valve 5; a main waste gas valve 6 is arranged at the position of the main waste gas pipe 3 close to the chimney 4, and the main waste gas valve 6 is in a normally closed state during normal production;
2) before the exhaust gas is discharged from the preorder hot blast stove 1 which is ready to enter the combustion stage in the air supply stage, the exhaust gas valve 5 corresponding to the next preorder hot blast stove 2 which is ready to enter the air supply stage in the combustion stage is opened, and then the exhaust gas valve 5 corresponding to the preorder hot blast stove 1 is opened;
3) as shown in fig. 1, the waste gas of a preorder hot blast furnace 1 enters a subsequent hot blast furnace 2, and the flow and the pressure of the waste gas of the preorder hot blast furnace 1 are utilized to realize rapid pressure equalization among the 2 hot blast furnaces;
4) when the pressures of the preceding hot blast stove 1 and the subsequent hot blast stove 2 tend to be balanced, closing a waste gas valve 5 corresponding to the subsequent hot blast stove 2, then opening a cold air pressure equalizing valve corresponding to the subsequent hot blast stove 2, and continuously equalizing the pressure of the cold air by the cold air until the pressure equalizing process is finished; opening the cold air pressure equalizing valve and simultaneously opening the waste gas main valve 6, discharging the residual waste gas of the preorder hot blast stove 1 through a chimney 4 (as shown in figure 2), and finally closing the waste gas valve 5 and the waste gas main valve 6 corresponding to the preorder hot blast stove 1.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples.
[ examples ] A method for producing a compound
In this example, a blast furnace equipped with 4 hot blast stoves is described, 4 hot blast stoves alternately supplying air to the blast furnace.
And a main waste gas valve is arranged on a main waste gas pipe close to the chimney, and is in a normally closed state during normal production so as to prevent waste gas of the hot blast stove from being directly discharged into the atmosphere through the chimney.
Before the waste gas valve corresponding to the preorder hot blast stove (the hot blast stove used for pressure equalization) which finishes the air supply stage is opened, the waste gas valve corresponding to the next preorder hot blast stove (the equalized hot blast stove) which finishes the combustion stage is opened firstly, then the waste gas valve of the preorder hot blast stove is opened, and the flow and the pressure of preorder hot blast stove waste gas are utilized to carry out rapid pressure equalization on 2 hot blast stoves. When the pressure of 2 hot blast stoves is balanced, the waste gas valve corresponding to the next hot blast stove is closed, the cold air pressure equalizing valve corresponding to the next hot blast stove is opened, and the cold air fed to the blast furnace continues to equalize the pressure of the cold air until the pressure equalizing process is finished. Opening the cold air pressure equalizing valve and the waste gas main valve at the same time, discharging the residual waste gas of the preorder hot blast stove through a chimney, and then closing the waste gas main valve.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (1)
1. A blast furnace hot blast stove furnace changing and pressure equalizing method is characterized by comprising the following steps:
1) each hot blast stove is respectively provided with a waste gas branch pipe which is connected with a waste gas main pipe leading to the chimney, and each waste gas branch pipe is respectively provided with a waste gas valve; a main waste gas valve is arranged at the position of the main waste gas pipe close to the chimney, and the main waste gas valve is in a normally closed state during normal production;
2) before the exhaust gas is discharged from the preorder hot blast stove which is ready to enter the combustion stage in the air supply stage, opening another exhaust gas valve corresponding to the postorder hot blast stove which is ready to enter the air supply stage in the combustion stage, and then opening the exhaust gas valve corresponding to the preorder hot blast stove;
3) waste gas of the preorder hot blast stove enters a subsequent hot blast stove, and the flow and the pressure of the waste gas of the preorder hot blast stove are utilized to realize rapid pressure equalization among 2 hot blast stoves;
4) when the pressures of the front-sequence hot blast stove and the subsequent hot blast stove tend to be balanced, a waste gas valve corresponding to the subsequent hot blast stove is closed, then a cold air pressure equalizing valve corresponding to the subsequent hot blast stove is opened, and the cold air continues to equalize the pressure until the pressure equalizing process is finished; and opening a waste gas main valve while opening the cold air pressure equalizing valve, discharging the residual waste gas of the preorder hot blast stove through a chimney, and finally closing a waste gas valve and a waste gas main valve corresponding to the preorder hot blast stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210189297.5A CN114774606A (en) | 2022-02-28 | 2022-02-28 | Blast furnace hot blast stove changing and pressure equalizing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210189297.5A CN114774606A (en) | 2022-02-28 | 2022-02-28 | Blast furnace hot blast stove changing and pressure equalizing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114774606A true CN114774606A (en) | 2022-07-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210189297.5A Pending CN114774606A (en) | 2022-02-28 | 2022-02-28 | Blast furnace hot blast stove changing and pressure equalizing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114774606A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115838843A (en) * | 2023-02-20 | 2023-03-24 | 山西建龙实业有限公司 | Device and method for recovering residual hot air of hot blast stove |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1080659A (en) * | 1992-06-26 | 1994-01-12 | 首钢总公司 | Useless wind recoverying and utilizing method of hotblast stove and device |
| CN103509904A (en) * | 2012-06-29 | 2014-01-15 | 上海梅山钢铁股份有限公司 | Waste gas pressurizing device and pressurizing method for blast-furnace hot blast stove |
| CN204608065U (en) * | 2015-04-03 | 2015-09-02 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of exhaust gas of hot-blast stove pressurizing system |
-
2022
- 2022-02-28 CN CN202210189297.5A patent/CN114774606A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1080659A (en) * | 1992-06-26 | 1994-01-12 | 首钢总公司 | Useless wind recoverying and utilizing method of hotblast stove and device |
| CN103509904A (en) * | 2012-06-29 | 2014-01-15 | 上海梅山钢铁股份有限公司 | Waste gas pressurizing device and pressurizing method for blast-furnace hot blast stove |
| CN204608065U (en) * | 2015-04-03 | 2015-09-02 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of exhaust gas of hot-blast stove pressurizing system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115838843A (en) * | 2023-02-20 | 2023-03-24 | 山西建龙实业有限公司 | Device and method for recovering residual hot air of hot blast stove |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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Application publication date: 20220722 |