CN110205423B - Method for damping down blast furnace low-pressure diffusion cut coal gas - Google Patents
Method for damping down blast furnace low-pressure diffusion cut coal gas Download PDFInfo
- Publication number
- CN110205423B CN110205423B CN201910567675.7A CN201910567675A CN110205423B CN 110205423 B CN110205423 B CN 110205423B CN 201910567675 A CN201910567675 A CN 201910567675A CN 110205423 B CN110205423 B CN 110205423B
- Authority
- CN
- China
- Prior art keywords
- pressure
- blast furnace
- furnace
- valve
- air
- 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.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/007—Controlling or regulating of the top pressure
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a method for damping down blast furnace low-pressure diffusion cut coal gas, which comprises the following steps: (1) when the blast furnace reduces the air and the pressure to the hot air pressure of 0.120-0.100 mpa and the top pressure of 0.040-0.030 mpa, introducing high-pressure steam to the top of the blast furnace; (2) continuously reducing air and pressure of the blast furnace, wherein the blast furnace air quantity is 0, the hot air pressure is 0.050mpa, and the furnace top pressure is 0.010 mpa; (3) opening a material surface sprinkling valve at the top of the furnace (the opening time is 5-10 s, and is specifically determined according to the temperature of the top of the furnace), sprinkling water on the material surface, and stopping sprinkling water on the material surface after the temperature of the top of the furnace is reduced to be below 100 ℃ so as to reduce the dust content in the coal gas on the material surface; (4) opening the furnace top bleeding valve and immediately closing the gas cut-off valve; (5) and closing a cold air valve and a hot air valve of the air supply furnace to finish the damping down. The method can ensure that the top of the blast furnace keeps positive pressure after the bleeding valve is opened, prevent the atmosphere from flowing backwards, ensure the damping down safety of the blast furnace, and the damping down is carried out immediately after the coal gas is opened and cut, the coal gas bleeding amount is close to 0, and the coal gas bleeding amount can be reduced to the maximum extent.
Description
Technical Field
The invention relates to the technical field of blast furnace smelting, in particular to a method for damping down blast furnace low-pressure diffusion cut coal gas.
Background
The blast furnace is a closed high-pressure reactor filled with furnace charge and coal gas. When the blast furnace needs to be overhauled, production needs to be stopped (i.e. damping down). The main purpose of damping down the blast furnace is to disconnect the blast furnace from the gas system and from the atmosphere (i.e. to release and cut the gas) and from the air supply system (blower, hot blast stove), so that the blast furnace is in an independent system and is in a production stop state (i.e. damping down, the same applies below) for maintenance.
The specific operation of the blast furnace for releasing and cutting coal gas is as follows: firstly, the furnace top bleeding valve is opened to ensure that the coal gas in the blast furnace has a channel, and then the coal gas cut-off valve is closed to achieve the purpose of disconnecting the blast furnace from the coal gas system. When the furnace top bleeding valve is opened, in order to ensure safety, the blast furnace must be in a positive pressure state (namely the pressure at the furnace top of the blast furnace is greater than the atmospheric pressure) so as to prevent the blast furnace from flowing backwards into the atmosphere after the furnace top bleeding valve is opened, and prevent the blast furnace from being mixed with gas (the main components are CO and CO) in the blast furnace2、N2) Explosive gas is formed, and potential safety hazards are generated. Therefore, when the blast furnace is used for blast, the following are generally specified: when the blast furnace reduces the air pressure and the pressure to the hot air pressure of 0.100mpa and the furnace top pressure of 0.030mpa, the furnace top discharge period valve is opened, and then the gas cut-off valve is closed, so that the work of discharging and tapping the gas is completed. And then continuing to reduce the wind and the pressure until the wind stops.
Because the blast furnace is operated by opening scattered gas,the hot air pressure is 0.100mpa, the top pressure is 0.030mpa, the blast furnace air quantity is 1/2 of the blast furnace volume, and 3200m is used3For example, the blast furnace (2) has an air volume of about 1600m3Min, about 2200m blast furnace gas generation3And/min. The time from the opening of the blast furnace to the gas cutting to the damping down (namely the air quantity is 0, the gas generation quantity is 0) is about 20min, and the average gas generation quantity in the time period is about 1100m3Min, 22000m3The gas is diffused into the atmosphere, and the blast furnace gas contains a large amount of coke powder and ore powder, so that visually, a dark dense smoke directly rushes to the skies at the diffusing valve at the top of the furnace, and the atmosphere is seriously polluted, which is contrary to green production. Chinese patent application No. 201510303149.1 (application No. 2015-06-07) discloses a blast furnace low-pressure air-discharge coal-cutting-gas blowing-down method which can reduce a part of blast furnace gas discharge amount, but still discharges a large amount of blast furnace gas into the air, and is complicated in operation and low in industrial applicability.
Therefore, a new method for damping down the blast furnace by using the diffused and cut coal gas is required to be developed, the method for reducing the atmosphere of the coal gas and the smoke to the maximum extent is required, and the green production is realized.
Disclosure of Invention
Based on the defects of the prior art, the technical problem solved by the invention is to provide a method for damping down blast furnace low-pressure diffusion cutting coal gas, which can ensure that the top of the blast furnace keeps positive pressure after a diffusion valve is opened, prevent atmosphere from flowing backwards, ensure the damping down safety of the blast furnace, and damp down immediately after the diffusion cutting coal gas is opened, wherein the coal gas dispersion amount is close to 0, the air supply time of the blast furnace after the diffusion cutting coal gas is opened can be greatly reduced, and the coal gas dispersion amount is reduced to the maximum extent.
In order to solve the technical problem, the invention provides a method for damping down blast furnace low-pressure diffusion cut coal gas, which comprises the following steps:
(1) before the blast furnace reduces the air and the pressure to the hot air pressure of 0.100mpa and the top pressure of 0.030mpa, introducing high-pressure steam to the top of the blast furnace;
(2) the blast furnace continues to reduce the air and the pressure, the air quantity of the blast furnace is 0, the pressure of hot air is 0.050mpa, the pressure of the furnace top is 0.010mpa, the air quantity entering the blast furnace is 0, the gas generation quantity of the blast furnace is also 0, the gas does not flow, and the pressure is static pressure;
(3) opening a material surface sprinkling valve at the top of the furnace (the opening time is 5-10 s, and is specifically determined according to the temperature of the top of the furnace), sprinkling water on the material surface, and stopping sprinkling water on the material surface after the temperature of the top of the furnace is reduced to be below 100 ℃ so as to reduce the dust content in the coal gas on the material surface;
(4) opening the furnace top bleeding valve and immediately closing the gas cut-off valve;
(5) and closing a cold air valve and a hot air valve of the air supply furnace to finish the damping down.
Preferably, the method for damping down the blast furnace low-pressure discharge coal gas provided by the invention further comprises part or all of the following technical characteristics:
as an improvement of the technical proposal, the pressure of the high-pressure steam in the step (1) is 0.4 mpa.
As an improvement of the technical scheme, in the step (1), when the blast furnace is subjected to air reduction and pressure reduction to reach the hot air pressure of 0.120-0.100 mpa and the top pressure of 0.040-0.030 mpa, high-pressure steam is introduced into the top of the blast furnace.
As an improvement of the technical scheme, the time for opening the water sprinkling valve of the material surface of the furnace top in the step (3) is 5-10 s.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
(1) before the blast furnace is opened for releasing and cutting coal gas, high-pressure steam is introduced into the furnace top to ensure that the furnace top of the blast furnace keeps positive pressure after the release valve is opened, the atmosphere backflow is reduced, and the damping down safety of the blast furnace is ensured.
(2) When the blast furnace reduces the air to 0, the scattered coal gas is opened. Therefore, the air quantity is reduced to 0, after the scattered and cut coal gas is opened, the damping-down operation (closing a cold air valve and a hot air valve of a hot air furnace) can be carried out in a short time, the blast furnace completely cuts off the air, the air supply time of the blast furnace after the scattered and cut coal gas is opened is greatly reduced, and the coal gas dispersion quantity can be reduced to the maximum extent.
(3) Before the gas is opened and scattered and cut, the material surface at the top of the furnace is sprayed with water for a certain time to reduce temperature and suppress dust, so that the smoke emission after the emission valve is opened can be reduced.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the contents of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following detailed description is given in conjunction with the preferred embodiments.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
FIG. 1 is a schematic view of a blast furnace process according to the present invention.
Detailed Description
Other aspects, features and advantages of the present invention will become apparent from the following detailed description, which, when taken in conjunction with the drawings, illustrate by way of example the principles of the invention.
A method for damping down blast furnace low-pressure diffusion cut coal gas comprises the following steps:
the implementation steps are as follows:
(1) when the blast furnace reduces the wind and the pressure to the range of 0.120-0.100 mpa and the top pressure of 0.040-0.030 mpa, high-pressure steam (the pressure is 0.4mpa) is introduced into the top of the blast furnace.
(2) The blast furnace continues to reduce the air and the pressure until the air volume is 0, the hot air pressure is 0.050mpa and the furnace top pressure is 0.010mpa (at this time, the air volume entering the blast furnace is 0, the gas generation volume of the blast furnace is also 0, the gas does not flow, and the pressure is static pressure).
(3) And opening a material surface sprinkling valve at the top of the furnace (the opening time is 5-10 s, and is specifically determined according to the temperature of the top of the furnace), sprinkling water on the material surface, and stopping sprinkling water on the material surface after the temperature of the top of the furnace is reduced to be below 100 ℃.
(4) And opening the furnace top bleeding valve, and then closing the gas cut-off valve to finish the operation of opening and bleeding the gas.
(5) And (5) informing the post of the hot blast stove, and closing a cold air valve and a hot air valve of the air supply stove to finish the damping down operation.
Fig. 1 is a schematic process diagram of a blast furnace, and as shown in fig. 1, during normal production, cold air sent by a blower is heated by a hot-blast stove and then sent into the blast furnace, and after an iron-making process is completed in the blast furnace, generated coal gas enters a coal gas pipe network. When the blast furnace stops blowing, the blast furnace needs to be disconnected from a gas pipe network (namely, a furnace top bleeding valve is opened, and a gas stop valve is closed), and then the blast furnace is disconnected from the hot blast furnace (namely, a cold valve and a hot valve of the hot blast furnace are closed), so that the blast furnace becomes an independent device, and the blast furnace stops blowing for maintenance.
Example 1
A method for damping down blast furnace low-pressure diffusion cut coal gas comprises the following actual operation steps:
a certain effective volume of 3200m3Damping down of the blast furnace:
(1) reducing the air flow in the blast furnace to about 1600m3Introducing high-pressure steam into the top of the blast furnace before the temperature is/min, the hot air pressure is 0.100mpa and the top pressure is 0.030mpa, wherein the steam pressure is 0.4 mpa.
(2) And continuing to reduce the air and the pressure until the air quantity is 0, the hot air pressure is 0.050mpa and the furnace top pressure is 0.010 mpa.
(3) And opening a furnace top water sprinkling valve to sprinkle water on the material surface, wherein the time for opening the furnace top water sprinkling valve is about 5-10 s, and the top temperature is reduced to be below 100 ℃.
(4) The furnace top bleeding valve is opened, and the gas cut-off valve is closed immediately.
(5) And (5) informing the post of the hot blast stove, and closing a cold air valve and a hot air valve of the air supply stove to finish the damping down operation.
The effect is as follows: after opening the furnace top bleeding valve, no black smoke is visible, and then only white steam is present. The damping down is carried out immediately after the coal gas is cut in the open state, so that the coal gas dispersion amount is close to 0.
Example 2
Effective volume 2200m of certain blast furnace3Damping down of the blast furnace:
(1) reducing the air flow in the blast furnace to about 1100m3Introducing high-pressure steam into the top of the blast furnace before min, wind pressure of 0.100mpa and top pressure of 0.030mpa, wherein the steam pressure is 0.4 mpa.
(2) And continuing to reduce the air and the pressure until the air quantity is 0, the hot air pressure is 0.050mpa and the furnace top pressure is 0.010 mpa.
(3) And opening a furnace top water sprinkling valve to sprinkle water on the material surface, wherein the time for opening the furnace top water sprinkling valve is about 10s, and the top temperature is reduced to be below 100 ℃.
(4) And opening the furnace top bleeding valve, and then closing the gas cut-off valve.
(5) And (5) informing the post of the hot blast stove, and closing a cold air valve and a hot air valve of the air supply stove to finish the damping down operation.
The effect is as follows: after opening the furnace top bleeding valve, no black smoke is visible, and then only white steam is present. The damping down is carried out immediately after the coal gas is cut in the open state, so that the coal gas dispersion amount is close to 0.
The raw materials listed in the invention, the upper and lower limits and interval values of the raw materials of the invention, and the upper and lower limits and interval values of the process parameters (such as temperature, time and the like) can all realize the invention, and the examples are not listed.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (3)
1. A method for damping down blast furnace low-pressure diffusion cut coal gas is characterized by comprising the following steps: the method comprises the following steps:
(1) before the blast furnace is subjected to air reduction and pressure reduction to reach the hot air pressure of 0.100MPa and the top pressure of 0.030MPa, introducing high-pressure steam to the top of the blast furnace, wherein the pressure of the high-pressure steam is 0.4 MPa;
(2) the blast furnace continues to reduce the air and the pressure, the air quantity of the blast furnace is 0, the pressure of hot air is 0.050MPa, the pressure of the furnace top is 0.010MPa, the air quantity entering the blast furnace is 0, the gas generation quantity of the blast furnace is also 0, the gas does not flow, and the pressure is static pressure;
(3) opening a material surface sprinkling valve at the top of the furnace, sprinkling water on the material surface, and stopping sprinkling water on the material surface after the temperature of the top of the furnace is reduced to be below 100 ℃ so as to reduce the dust content in the coal gas on the material surface;
(4) opening the furnace top bleeding valve and immediately closing the gas cut-off valve;
(5) and closing a cold air valve and a hot air valve of the air supply furnace to finish the damping down.
2. The method for damping down of blast furnace low pressure bleed-off coal gas as claimed in claim 1, wherein: and (1) introducing high-pressure steam to the top of the blast furnace when the blast furnace reduces the air pressure and the pressure to 0.120-0.100 MPa and the top pressure is 0.040-0.030 MPa.
3. The method for damping down of blast furnace low pressure bleed-off coal gas as claimed in claim 1, wherein: and (3) opening the water spraying valve on the material surface of the furnace top for 5-10 s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910567675.7A CN110205423B (en) | 2019-06-27 | 2019-06-27 | Method for damping down blast furnace low-pressure diffusion cut coal gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910567675.7A CN110205423B (en) | 2019-06-27 | 2019-06-27 | Method for damping down blast furnace low-pressure diffusion cut coal gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110205423A CN110205423A (en) | 2019-09-06 |
| CN110205423B true CN110205423B (en) | 2021-03-30 |
Family
ID=67795051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910567675.7A Active CN110205423B (en) | 2019-06-27 | 2019-06-27 | Method for damping down blast furnace low-pressure diffusion cut coal gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110205423B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111363870B (en) * | 2020-02-21 | 2021-07-06 | 江阴兴澄特种钢铁有限公司 | Environment-friendly damping-down method for blast furnace |
| CN112251552B (en) * | 2020-09-28 | 2022-04-19 | 南京钢铁股份有限公司 | Coal gas treatment method for eliminating black smoke emitted from top of blast furnace |
| CN116875754A (en) * | 2023-08-10 | 2023-10-13 | 广东中南钢铁股份有限公司 | Damping down method for water leakage of blast furnace |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5597410A (en) * | 1979-01-16 | 1980-07-24 | Sumitomo Metal Ind Ltd | Furnace cooling method after blast furnace blows out |
| CN104651556A (en) * | 2013-11-22 | 2015-05-27 | 天津天铁冶金集团有限公司 | Furnace blowout method for blast furnace hearth repairing without remainder iron discharge |
| CN104878141B (en) * | 2015-06-07 | 2017-03-08 | 山西太钢不锈钢股份有限公司 | Coal gas damping down method is cut in a kind of blast furnace low pressure air draft |
| CN109295271B (en) * | 2018-11-27 | 2020-07-14 | 南京钢铁股份有限公司 | Method for prolonging time for recovering coal gas by blowing out blast furnace empty material line |
-
2019
- 2019-06-27 CN CN201910567675.7A patent/CN110205423B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110205423A (en) | 2019-09-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110205423B (en) | Method for damping down blast furnace low-pressure diffusion cut coal gas | |
| CN109295271A (en) | A kind of method that blast furnace stockline dropping blowing out extends the gas recovery time | |
| CN101696458A (en) | Method for quantitative stock level-lowering and blowing out of blast furnace | |
| CN110643761B (en) | Blast furnace top ignition method | |
| CN110117683B (en) | Novel environment-friendly blowing-out operation method from empty material line to tuyere | |
| CN109321699A (en) | A kind of method of the blast furnace stockline dropping blowing out not residual iron placing burn-up dead coke heap of tuyere area | |
| CN105714006A (en) | Method for blast furnace stopping for heavy maintenance | |
| KR102037032B1 (en) | gas treatment for the prevention of pollution from top bleeder valves of blast furnace plant | |
| CN111793728A (en) | Blast furnace smelting fly ash treatment system and treatment method thereof | |
| CN211199256U (en) | Blast furnace damping device for safely recovering furnace top gas | |
| CN211726137U (en) | Clean, efficient and safe multi-powder-grinding-function coal powder preparation device | |
| CN107964576A (en) | A kind of vacuum pump system and its method of work for VOD refining furnaces | |
| CN109136457B (en) | Converter gas recovery system and method | |
| CN101581211B (en) | Method for comprehensively extinguishing underground gasification furnace | |
| CN103184305B (en) | Explosion-proof control method adopting electric precipitation for vanadium extraction in converter | |
| CN104630399A (en) | Method for controlling H2 content in coal gas in safety range in blowing out process | |
| CN211814525U (en) | Treatment device for diffused gas at top of blast furnace | |
| CN211665118U (en) | Gas recycling device for blast furnace cutting gas | |
| CN221028519U (en) | Long-distance blast furnace hydrogen-rich smelting and blowing system | |
| CN100491550C (en) | Lead blowing-furnace oxygen-rich smelting process | |
| CN111117685B (en) | Oxygen-enriched air blast management system in front of catalytic cracker | |
| CN202047074U (en) | Belly pipe for blast furnace | |
| CN203890372U (en) | Oxygen enrichment regulation system of oxygen coal lance of blast furnace | |
| CN109517938A (en) | The method for preventing from bessemerizing dry method dust venting of dust explosion after interrupting | |
| CN114231690B (en) | Control method of oxygen lance nitrogen sealing system of converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |