CN110205423A - A kind of method that coal gas damping down is cut in the release of blast furnace low pressure - Google Patents
A kind of method that coal gas damping down is cut in the release of blast furnace low pressure Download PDFInfo
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- CN110205423A CN110205423A CN201910567675.7A CN201910567675A CN110205423A CN 110205423 A CN110205423 A CN 110205423A CN 201910567675 A CN201910567675 A CN 201910567675A CN 110205423 A CN110205423 A CN 110205423A
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- blast furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
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- 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
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a kind of blast furnace low pressure to diffuse the method for cutting coal gas damping down, comprising the following steps: (1) when blast furnace checking is depressured to 0.120~0.100mpa of thermal air pressure, 0.040~0.030mpa of press, leads to high steam to blast furnace roof；(2) blast furnace continues checking decompression, until blast furnace air quantity is 0, hot-blast pressure 0.050mpa, furnace top pressure 0.010mpa；(3) furnace roof charge level sprinkler valve (5~10s of opening time, specifically depending on top temperature) is opened, charge level watering is carried out, stops charge level watering after top temperature is dropped to 100 DEG C or less, to reduce the dustiness on charge level in coal gas；(4) bleeding valve is opened, closes gas stop valve immediately；(5) cold blast sliding valve, the hot-blast valve for closing air-supply furnace, complete damping down.This method can not only guarantee that blast furnace roof keeps positive pressure after opening diffusion valve, prevents atmosphere from flowing backward, it is ensured that blast furnace staying safety, and it is open dissipate cut coal gas after and then with regard to damping down, coal gas diffusion amount can reduce coal gas diffusion amount close to 0 to the maximum extent.
Description
Technical field
The present invention relates to technical field of blast furnace process more particularly to a kind of blast furnace low pressure to diffuse the method for cutting coal gas damping down.
Background technique
Blast furnace is a closed high-pressure reactor full of furnace charge, coal gas.When blast furnace needs to overhaul, need to stop
It produces (that is: damping down).Blast furnace staying main purpose is to disconnect and communicate with atmosphere (that is: diffusing and cutting coal with coal gas system by blast furnace
Gas) and supply air system (air blower, hot-blast stove) disconnection, to make blast furnace be in an independent system, and in stopping life
Occurrence state (that is: damping down, similarly hereinafter), to put into overhaul.
The concrete operations that blast furnace out-spreading cuts coal gas are: first opening bleeding valve, have with the coal gas guaranteed in blast furnace
One channel, then turns off gas stop valve, to achieve the purpose that blast furnace and coal gas system disconnect.Opening bleeding valve
When, in order to guarantee safety, blast furnace is necessary for barotropic state (i.e. the pressure of blast furnace roof is greater than atmospheric pressure), to prevent furnace roof from diffusing
After valve is opened, atmosphere flows backward the coal gas (main ingredient are as follows: CO, CO carried out in blast furnace, with blast furnace2、N2) explosive gas is formed,
Generate security risk.Therefore, general provision: blast furnace is depressured to hot-blast pressure at 0.100mpa, furnace at blast furnace checking at release
Pressure on top surface opens furnace roof and puts phase valve in 0.030mpa, closes gas stop valve later, and completion, which is put, attacks the work for cutting coal gas.So
After be further continued for checking decompression until damping down.
Due to blast furnace it is open dissipate section and cut coal gas operation when, hot-blast pressure in 0.100mpa, furnace top pressure in 0.030mpa,
Blast furnace air quantity is about the 1/2 of blast furnace heat size at this time, with 3200m3Blast furnace for, air quantity is about 1600m at this time3/ min, blast furnace
Coal resource is about 2200m3/min.Coal gas is cut to damping down (i.e. air quantity be 0, coal resource 0) about from open dissipate of blast furnace
Need the time of 20min, this time coal resource that is averaged is about 1100m3/ min then shares 22000m3Coal gas diffusion to big
In gas, and contain a large amount of coke blacking, mineral powder in blast furnace gas, visually see, at bleeding valve, one is pitch-black dense
Cigarette soars up to the sky, and causes serious pollution to atmosphere, this runs in the opposite direction with green production.Chinese invention patent (application number:
201510303149.1, the applying date: 2015-06-07) coal gas damping down method is cut in a kind of blast furnace low pressure air draft of open class, though this method
The blast furnace gas discharge amount of a part can be so reduced, but is still discharged into air there are also high amount of blast furnace gas,
And this method operation is relatively complicated, and implementation industrially is lower.
Need to develop a kind of method that new blast furnace out-spreading cuts coal gas damping down thus, reduce to the maximum extent coal gas and flue dust into
The method of row atmosphere realizes green production.
Summary of the invention
Based on the above the deficiencies in the prior art, technical problem solved by the invention is to provide a kind of blast furnace low pressure release
The method for cutting coal gas damping down, this method can not only guarantee that blast furnace roof keeps positive pressure after opening diffusion valve, prevents atmosphere from flowing backward,
Ensure blast furnace staying safety, and opening dissipates after cutting coal gas and then with regard to damping down, coal gas diffusion amount, can be substantially close to 0
Degree ground, which reduces, opens the time that blast furnace air-supply after coal gas is cut in release, reduces coal gas diffusion amount to the maximum extent.
In order to solve the above technical problem, the present invention provides a kind of blast furnace low pressure to diffuse the method for cutting coal gas damping down, including
Following steps:
(1) before blast furnace checking is depressured to thermal air pressure 0.100mpa, press 0.030mpa, lead to high pressure to blast furnace roof and steam
Vapour；
(2) blast furnace continue checking decompression, until blast furnace air quantity be 0, hot-blast pressure 0.050mpa, furnace top pressure 0.010mpa,
At this time into blast furnace air quantity be 0, the coal resource of blast furnace is also 0, coal gas does not flow, and pressure is static pressure；
(3) furnace roof charge level sprinkler valve (5~10s of opening time, specifically depending on top temperature) is opened, charge level is carried out and spills
Water stops charge level watering, to reduce the dustiness on charge level in coal gas after top temperature is dropped to 100 DEG C or less；
(4) bleeding valve is opened, closes gas stop valve immediately；
(5) cold blast sliding valve, the hot-blast valve for closing air-supply furnace, complete damping down.
As a preferred embodiment of the above technical solution, the method that coal gas damping down is cut in blast furnace low pressure release provided by the invention is further
Including some or all of following technical characteristic:
As an improvement of the above technical solution, the pressure of step (1) described high steam is 0.4mpa.
As an improvement of the above technical solution, step (1) blast furnace checking be depressured to 0.120~0.100mpa of thermal air pressure,
When pressing between 0.040~0.030mpa, lead to high steam to blast furnace roof.
As an improvement of the above technical solution, the step (3) opens the time of furnace roof charge level sprinkler valve as 5~10s.
Compared with prior art, technical solution of the present invention has the following beneficial effects:
(1) for blast furnace before opening release and cutting coal gas, furnace roof leads to high steam, to guarantee to open blast furnace roof after diffusion valve
Positive pressure is kept, drop is stopped atmosphere and flowed backward, it is ensured that blast furnace staying safety.
(2) open dissipate cuts coal gas when blast furnace checking is to 0.Because air quantity at this time has reduced to 0, it is open dissipate cut coal gas after, Ji Ke
It carries out in short time damping down operation (closing cold blast sliding valve, the hot-blast valve of hot-blast stove), blast furnace thoroughly breaks wind, significantly reduces out
The time of blast furnace air-supply after coal gas is cut in release, can reduce coal gas diffusion amount to the maximum extent.
(3) it is open dissipate cut coal gas before, furnace roof charge level carries out watering cooling, the dust suppression of certain time, can reduce opening and put
Soot emissions after dissipating valve.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects, features and advantages of the invention can
It is clearer and more comprehensible, below in conjunction with preferred embodiment, detailed description are as follows.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, the attached drawing to embodiment is simply situated between below
It continues.
Fig. 1 is blast furnace technology schematic diagram of the present invention.
Specific embodiment
The following detailed description of a specific embodiment of the invention, as part of this specification, by embodiment come
Illustrate that the principle of the present invention, other aspects of the present invention, feature and its advantage will become apparent by the detailed description.
A kind of method that coal gas damping down is cut in the release of blast furnace low pressure:
Implementation steps are as follows:
(1) blast furnace is when checking is depressured between 0.120~0.100mpa of wind pressure, 0.040~0.030mpa of press, Xiang Gao
Furnace furnace roof leads to high steam (pressure 0.4mpa).
(2) blast furnace continues checking decompression, until air quantity is 0, hot-blast pressure 0.050mpa, furnace top pressure 0.010mpa (this
When enter that the air quantity of blast furnace is 0, the coal resource of blast furnace is also 0, coal gas does not flow, and pressure is static pressure).
(3) furnace roof charge level sprinkler valve (5~10s of opening time, specifically depending on top temperature) is opened, charge level is carried out and spills
Water stops charge level watering after top temperature is dropped to 100 DEG C or less.
(4) bleeding valve is opened, gas stop valve is and then closed, open dissipate is completed and cuts coal gas operation.
(5) it notifies hot-blast stove post, closes cold blast sliding valve, the hot-blast valve of air-supply furnace, complete damping down operation.
Fig. 1 is blast furnace technology schematic diagram, as shown in Figure 1, during normal production, the cold wind that air blower is sent is after hot-blast stove heats up
It is sent into blast furnace, after completing iron-smelting process process in blast furnace, the coal gas of generation enters gaspipe network.In blast furnace staying, then need
Blast furnace and gaspipe network are disconnected into (i.e. opening bleeding valve, closing gas stop valve), disconnected (i.e. with hot-blast stove again later
Close the hot and cold air-valve of hot-blast stove), so that blast furnace is become an independent equipment, blast furnace is made to carry out Status of hugh wind to overhaul.
Embodiment 1
A kind of method that coal gas damping down is cut in the release of blast furnace low pressure, steps are as follows for practical operation:
Certain dischargeable capacity 3200m3Blast furnace damping down:
(1) in blast furnace checking to air quantity about 1600m3Before/min, thermal air pressure 0.100mpa, press 0.030mpa, Xiang Gao
Furnace furnace roof leads to high steam, steam pressure 0.4mpa.
(2) continue checking decompression, until air quantity is 0, hot-blast pressure 0.050mpa, furnace top pressure 0.010mpa.
(3) it opens furnace roof sprinkler valve and carries out charge level watering, the time for opening furnace roof sprinkler valve is 5~10s or so, by top temperature
Drop to 100 DEG C or less.
(4) bleeding valve is opened, closes gas stop valve immediately.
(5) it notifies hot-blast stove post, closes cold blast sliding valve, the hot-blast valve of air-supply furnace, complete damping down operation.
Effect: after opening bleeding valve, not being evident that black flue dust, just there was only the steam of white later.Cause
It is open dissipate cut coal gas after and then with regard to damping down, coal gas diffusion amount is close to 0.
Embodiment 2
Certain blast furnace dischargeable capacity 2200m3Blast furnace damping down:
(1) in blast furnace checking to air quantity about 1100m3Before/min, wind pressure 0.100mpa, press 0.030mpa, Xiang Gaolu
Furnace roof leads to high steam, and steam pressure is 0.4mpa.
(2) continue checking decompression, until air quantity is 0, hot-blast pressure 0.050mpa, furnace top pressure 0.010mpa.
(3) it opens furnace roof sprinkler valve and carries out charge level watering, the time for opening furnace roof sprinkler valve is 10s or so, will push up temperature drop
To 100 DEG C or less.
(4) bleeding valve is opened, closes gas stop valve later.
(5) it notifies hot-blast stove post, closes cold blast sliding valve, the hot-blast valve of air-supply furnace, complete damping down operation.
Effect: after opening bleeding valve, not being evident that black flue dust, just there was only the steam of white later.Cause
It is open dissipate cut coal gas after and then with regard to damping down, coal gas diffusion amount is close to 0.
The bound of each raw material cited by the present invention and each raw material of the present invention, section value and technological parameter
Bound, the section value of (such as temperature, time) can realize the present invention, embodiment numerous to list herein.
The above is a preferred embodiment of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, it is noted that for those skilled in the art, without departing from the principle of the present invention, may be used also
To make several improvement and variation, these, which improve and change, is also considered as protection scope of the present invention.
Claims (4)
1. a kind of blast furnace low pressure diffuses the method for cutting coal gas damping down, it is characterised in that: the following steps are included:
(1) before blast furnace checking is depressured to thermal air pressure 0.100mpa, press 0.030mpa, lead to high steam to blast furnace roof；
(2) blast furnace continue checking decompression, until blast furnace air quantity be 0, hot-blast pressure 0.050mpa, furnace top pressure 0.010mpa, at this time
Air quantity into blast furnace is 0, the coal resource of blast furnace is also 0, and coal gas does not flow, and pressure is static pressure；
(3) furnace roof charge level sprinkler valve (5~10s of opening time, specifically depending on top temperature) is opened, charge level watering is carried out, it will
Top temperature stops charge level watering after dropping to 100 DEG C or less, to reduce the dustiness on charge level in coal gas；
(4) bleeding valve is opened, closes gas stop valve immediately；
(5) cold blast sliding valve, the hot-blast valve for closing air-supply furnace, complete damping down.
2. blast furnace low pressure as described in claim 1 diffuses the method for cutting coal gas damping down, it is characterised in that: step (1) described height
The pressure for pressing steam is 0.4mpa.
3. blast furnace low pressure as described in claim 1 diffuses the method for cutting coal gas damping down, it is characterised in that: step (1) is in blast furnace
When checking is depressured between 0.120~0.100mpa of thermal air pressure, 0.040~0.030mpa of press, leads to high pressure to blast furnace roof and steam
Vapour.
4. blast furnace low pressure as described in claim 1 diffuses the method for cutting coal gas damping down, it is characterised in that: step (3) opens furnace
The time of liftout face sprinkler valve is 5~10s.
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| CN201910567675.7A CN110205423B (en) | 2019-06-27 | 2019-06-27 | Method for damping down blast furnace low-pressure diffusion cut coal gas |
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| CN201910567675.7A CN110205423B (en) | 2019-06-27 | 2019-06-27 | Method for damping down blast furnace low-pressure diffusion cut coal gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111363870A (en) * | 2020-02-21 | 2020-07-03 | 江阴兴澄特种钢铁有限公司 | Environment-friendly damping-down method for blast furnace |
| CN112251552A (en) * | 2020-09-28 | 2021-01-22 | 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 |
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| 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 |
| CN104878141A (en) * | 2015-06-07 | 2015-09-02 | 山西太钢不锈钢股份有限公司 | Blast furnace low pressure exhaust air cut coal gas blowing down method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111363870A (en) * | 2020-02-21 | 2020-07-03 | 江阴兴澄特种钢铁有限公司 | Environment-friendly damping-down method for blast furnace |
| CN112251552A (en) * | 2020-09-28 | 2021-01-22 | 南京钢铁股份有限公司 | Coal gas treatment method for eliminating black smoke emitted from top of 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 |
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