CN102409122A - Blast furnace oxygen adding coal injection method and apparatus thereof - Google Patents
Blast furnace oxygen adding coal injection method and apparatus thereof Download PDFInfo
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- CN102409122A CN102409122A CN2011103772062A CN201110377206A CN102409122A CN 102409122 A CN102409122 A CN 102409122A CN 2011103772062 A CN2011103772062 A CN 2011103772062A CN 201110377206 A CN201110377206 A CN 201110377206A CN 102409122 A CN102409122 A CN 102409122A
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Abstract
The invention discloses a blast furnace oxygen adding coal injection method and an apparatus thereof, and relates to a blast furnace coal injection method. According to the apparatus, a pressure stabilizing nitrogen tank is communicated with a blowing tank by a manual nitrogen valve; the blowing tank is communicated with the blast furnace by a blowing pipe; an air feeding nitrogen tank is communicated with an air feeding total pipe by the manual nitrogen valve and a nitrogen flow meter; the air feeding total pipe is communicated with the blowing pipe. The apparatus is characterized in that: a high pressure oxygen pipe is additionally arranged, and is communicated with the air feeding total pipe sequentially by a check valve, a fast switch electromagnetic valve, an oxygen flow meter, an electromagnetic regulating valve and a manual oxygen valve; the air feeding total pipe forms a bypass communication with an oxygen analyzer for oxygen amount detection; the pipeline between the manual nitrogen valve and the nitrogen flow meter forms a bypass communication with an oxygen analyzer for inverted fleeing oxygen detection; the information output ends of the two flow meters and the two oxygen analyzers are respectively communicated with the input end of a PLC central processing unit; the output end of the PLC central processing unit is connected with the information input ends of the electromagnetic regulating valve and the fast switch electromagnetic valve. With the present invention, the coke ratio and the fuel ratio are substantially reduced, and the burning rate of the coal fines is significantly improved.
Description
Technical field:
The present invention relates to blast-furnace coal powder injection method, particularly a kind of in coal spraying pipeline the technology of oxygenation.
Background technology:
No. 5 bf coal injection systems of three steel adopt coal dust concentrated phase conveying technology, are that power carries out breeze blowing with the high pressure nitrogen, and coal suitable for blowing is the abundant hard coal of this resource-saving.The advantage of whole technology is ability safety, stable, even, successive coal powder injection.
Since No. 5 blast furnace openings; Taked full blast temperature (wind-warm syndrome reaches 1200 ℃), high oxygen enrichment (oxygen enrichment percentage＞3%) etc. to help improving the operation measure of coal powder injection ratio; But coal powder injection is paced up and down than always at lower level, and original fuel consumption is higher, repeatedly carries high-coal ratio and all has no resolution because of influencing the working of a furnace.Its major cause is: three steel use single hard coal winding-up.Coal powder injection both at home and abroad at present is to adopt injecting mixed coal (to mix coal promptly according to bituminous coal and anthracitic performance than the blast furnace overwhelming majority of stable maintenance higher level; Carry out mixture of coal by a certain percentage); And Fujian Province does not have the bituminous coal mine point; Receive three steel geographical position to influence, hard transportation high, and the raw coal place is little from other provinces allocation and transportation bituminous coal cost, peripheral environment force our factory with hard coal as coal suitable for blowing.With mix the coal facies ratio, anthracitic shortcoming is that incendivity is poor, point of ignition is high.
Existing apparatus is: the voltage stabilizing nitrogen pot jar is communicated with winding-up through the nitrogen manual valve, and winding-up jar is communicated with blast furnace through the winding-up pipe, is communicated with for the wind nitrogen pot through nitrogen manual valve, nitrogen flow meter and to the wind house steward, is communicated with jetting to manage to the wind house steward.Its coal injection method is: the voltage stabilizing nitrogen pot is given the winding-up jar pressurization of seasoning coal dust; Because the pressure of air supply of giving the wind nitrogen pot is far above the blast-furnace hot-air blast; Give the wind nitrogen pot through when the winding-up pipe is blown to blast furnace, producing negative pressure, cause winding-up jar coal dust and in the winding-up pipe, get into blast furnace to the wind house steward.
Summary of the invention:
The objective of the invention is to hard coal as under the coal suitable for blowing condition; Invent a kind of the winding-up pipeline in oxygen-doped novel process; Making jets in the pipeline of delivering coal reaches 45%-50% for the oxygen level of wind; Be used for improving coal combustion rate, realize the method and the device of the energy-saving and cost-reducing oxygen-doped coal powder injection of a kind of blast furnace.
The scheme of the inventive method is: comprise the winding-up jar pressurization of voltage stabilizing nitrogen pot to the seasoning coal dust; Give the wind nitrogen pot through when the winding-up pipe is blown to blast furnace, producing negative pressure to the wind house steward; Cause winding-up jar coal dust and in the winding-up pipe, get into blast furnace; It is characterized in that: with high pressure oxygen successively through check valve, cut magnetic valve, oxygen flow meter, solenoid valve, oxygen hand-operated valve soon and introduce to the wind house steward and give oxygenation in the air channel; Simultaneously oxygen detection oxygen analyser is gone here and there in one of bypass on nitrogen hand-operated valve and nitrogen flow meter connecting pipeline; Use oxygen analyser detecting on the wind house steward oxygen-supplying amount of bypass, the PLC central processing unit of setting up is controlled the solenoid valve aperture after passing through comparison operation based on the oxygen-doped scale parameter of the information data of oxygen flow meter, nitrogen flow meter and setting, to regulate oxygen-doped amount.
Apparatus of the present invention scheme is: comprise that the voltage stabilizing nitrogen pot is communicated with the winding-up jar through the nitrogen manual valve; The winding-up jar is communicated with blast furnace through the winding-up pipe; Pass through nitrogen manual valve, nitrogen flow meter and be communicated with for the wind house steward to the wind nitrogen pot; Be communicated with for the wind house steward with the winding-up pipe; It is characterized in that: set up the hyperbaric oxygen tracheae successively through vacuum breaker, cut SV, oxygen flow meter, solenoid valve, oxygen manual valve and be communicated with for the wind house steward soon; Go up oxygen-supplying amount detection of bypass connection for the wind house steward and use oxygen analyser; Bypass is communicated with one and goes here and there oxygen and detect and use oxygen analyser on the pipeline between nitrogen manual valve and nitrogen flow meter, and oxygen flow meter, nitrogen flow meter, oxygen-supplying amount detect with oxygen analyser, the oxygen of going here and there detection and be communicated with the PLC cpu information input terminal circuit of setting up respectively with the information output of oxygen analyser, PLC cpu information output with solenoid valve, cut SV information input terminal circuit soon and be connected.
The invention has the advantages that:
1, utilize limited working condition, the high coke ratio of economic worth, the fuel ratio that obtain with less investment reduce significantly.
2, making full use of anthracitic security feature (volatile matter is low, the high difficult generation of point of ignition is exploded) and calorific value high (carbon content is all higher than ordinary coke), is the measure of suiting measures to local conditions.
3, height contains the oxygen atmosphere and makes the rate of combustion of coal dust significantly improve in the pipeline, and increasing coal powder injection does not increase than laggard unburned coal powder of going into stock column, and smooth operation of furnace can not be affected.
4, the oxygen depletion of whole technology use is very little, can not cause anxiety to steel making oxygen, and safe and simple, is convenient to actually operating.
Description of drawings:
Accompanying drawing is the oxygen-doped process structure synoptic diagram of pulverized coal injection.
Embodiment:
Apparatus of the present invention structure is: comprise that voltage stabilizing nitrogen pot 4 is communicated with winding-up jar 6 by nitrogen hand-operated valve 5; Winding-up jar 6 is communicated with blast furnace 7 by the winding-up pipe; Pass through nitrogen hand-operated valve 5, nitrogen flow meter 13 and be communicated with for the wind house steward to wind nitrogen pot 14; Be communicated with for the wind house steward with the winding-up pipe; It is characterized in that: set up hyperbaric oxygen tracheae 3 successively by check valve 2, cut magnetic valve 8, oxygen flow meter 9, solenoid valve 10, oxygen hand-operated valve 11 and be communicated with for the wind house steward soon; Go up bypass for the wind house steward and be communicated with an oxygen-supplying amount detection oxygen analyser 12; Bypass is communicated with one and goes here and there oxygen and detect with oxygen analyser 16 on the pipeline between nitrogen hand-operated valve 5 and nitrogen flow meter 13, and oxygen flow meter 9, nitrogen flow meter 13, oxygen-supplying amount detect with oxygen analyser 12, the oxygen of going here and there detection and be communicated with the PLC central processing unit information input terminal circuit of setting up respectively with the information output of oxygen analyser 16, PLC central processing unit information output with solenoid valve 10, cut magnetic valve 8 information end lines soon and be connected.
As shown in the figure: our factory adopts two nitrogen pots as gas holder, specializes in winding-up for wind nitrogen pot 14 and gives wind, and manual valve, tensimeter, nitrogen flow meter 13 are housed on this road pipeline; Voltage stabilizing nitrogen pot 4 is responsible for the voltage stabilizing of winding-up jar 6, on this road pipeline manual valve and tensimeter is housed.Offer a mouth of pipe for giving on the wind house steward between wind nitrogen pot 14 and the winding-up pipe; Insert one road oxygen pipeline, the special-purpose vacuum breaker 2 of oxygen (prevent nitrogen from going here and there to the oxygen pipe network) is installed on this pipeline, is diffused valve 1 (diffusing the gas in the pipeline when being used to overhaul), repid cut-off valve, tensimeter, oxygen flow meter 9, solenoid valve 10, manual valve etc.Two cover oxygen analysers are installed in the nitrogen air-supply process, and after the oxygen of going here and there detection was positioned at the nitrogen manual valve 5 to wind nitrogen pot 14 with oxygen analyser 16, oxygen-supplying amount detected and is positioned in the wind house steward bypass with oxygen analyser 12.
During ordinary production; The coal powder injection watchstander sets an oxygen-doped ratio of fixed on computers, is automatically adjusted through oxygen solenoid valve 10 with oxygen flow meter 9 feedback data by the winding-up program, and making actual oxygen-doped ratio is benchmark with the oxygen-doped ratio of setting; In a very little scope, fluctuate; Two oxygen analysers are used for measuring and showing the actual oxygen level in the each point pipeline, and when running into the burst Special Circumstances, oxygen falls string to giving the wind nitrogen pot 14 or the ultra upper limit of oxygen content; Information input PLC cpu cuts out rapidly by its instruction oxygen repid cut-off valve automatically when reaching the alarming value that oxygen analyser sets, and has protected the safety of whole technology.
Claims (2)
1. the method for the oxygen-doped coal powder injection of blast furnace; Comprise winding-up jar (6) pressurization of voltage stabilizing nitrogen pot (4) to the seasoning coal dust; Give wind nitrogen pot (14) through when the winding-up pipe is given blast furnace (7) air-supply, producing negative pressure to the wind house steward; Cause winding-up jar (6) coal dust and in the winding-up pipe, get into blast furnace (7); It is characterized in that: with high pressure oxygen successively through vacuum breaker (2), cut SV (8), oxygen flow meter (9), solenoid valve (10), oxygen manual valve (11) soon and introduce and give oxygenation in the air channel for the wind house steward; One of bypass is gone here and there the oxygen detection with oxygen analyser (16) on nitrogen manual valve (5) and nitrogen flow meter (13) connecting pipeline simultaneously; Detecting with oxygen analyser (12) to oxygen-supplying amount of bypass on the wind house steward, the PLC cpu of setting up is controlled solenoid valve (10) aperture according to the information data of oxygen flow meter (9), nitrogen flow meter (13) and the oxygen-doped scale parameter of setting through after the comparison operation, to regulate oxygen-doped amount.
2. the device of the oxygen-doped coal powder injection of blast furnace; Comprise that voltage stabilizing nitrogen pot (4) is communicated with winding-up jar (6) through nitrogen manual valve (5); Winding-up jar (6) is communicated with blast furnace (7) through the winding-up pipe; Pass through nitrogen manual valve (5), nitrogen flow meter (13) and be communicated with for the wind house steward to wind nitrogen pot (14); Be communicated with for the wind house steward with the winding-up pipe; It is characterized in that: set up hyperbaric oxygen tracheae (3) successively through vacuum breaker (2), cut SV (8), oxygen flow meter (9), solenoid valve (10), oxygen manual valve (11) and be communicated with for the wind house steward soon; Go up bypass for the wind house steward and be communicated with an oxygen-supplying amount detection with oxygen analyser (12); Bypass is communicated with one and goes here and there oxygen and detect with oxygen analyser (16) on the pipeline between nitrogen manual valve (5) and nitrogen flow meter (13), and oxygen-supplying amount detects with oxygen analyser (12), the oxygen of going here and there detection and is communicated with the PLC cpu information input terminal circuit of setting up respectively with oxygen analyser (16), oxygen flow meter (9), nitrogen flow meter (13) information output, PLC cpu information output with solenoid valve (10), cut SV (8) information input terminal circuit soon and be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103772062A CN102409122A (en) | 2011-11-23 | 2011-11-23 | Blast furnace oxygen adding coal injection method and apparatus thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103772062A CN102409122A (en) | 2011-11-23 | 2011-11-23 | Blast furnace oxygen adding coal injection method and apparatus thereof |
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| CN102409122A true CN102409122A (en) | 2012-04-11 |
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| CN2011103772062A Pending CN102409122A (en) | 2011-11-23 | 2011-11-23 | Blast furnace oxygen adding coal injection method and apparatus thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014205A (en) * | 2012-12-31 | 2013-04-03 | 中冶京诚工程技术有限公司 | Oxygen supply method for oxygen-enriched coal injection of blast furnace |
| CN104099435A (en) * | 2014-07-16 | 2014-10-15 | 首钢总公司 | Oxygen enrichment process and device for providing concentration-adjustable nitrogen and oxygen mixed gas to casing coal injection gun |
| CN106435425A (en) * | 2016-11-28 | 2017-02-22 | 无锡市莱达热工工程有限公司 | Header pipe system of hot galvanizing furnace |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1110718A (en) * | 1995-03-20 | 1995-10-25 | 北京科技大学 | Gas supply and control device for spraying oxygen in blast furnace |
| JP2001063823A (en) * | 1999-08-24 | 2001-03-13 | Nkk Corp | Blowing method and device for powder and grain |
| CN202322881U (en) * | 2011-11-23 | 2012-07-11 | 福建三钢闽光股份有限公司 | Oxygen doping and coal injection device for blast furnace |
-
2011
- 2011-11-23 CN CN2011103772062A patent/CN102409122A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1110718A (en) * | 1995-03-20 | 1995-10-25 | 北京科技大学 | Gas supply and control device for spraying oxygen in blast furnace |
| JP2001063823A (en) * | 1999-08-24 | 2001-03-13 | Nkk Corp | Blowing method and device for powder and grain |
| CN202322881U (en) * | 2011-11-23 | 2012-07-11 | 福建三钢闽光股份有限公司 | Oxygen doping and coal injection device for blast furnace |
Non-Patent Citations (1)
| Title |
|---|
| 吕杏春: "高炉喷煤测量技术的试验", 《浙江冶金》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014205A (en) * | 2012-12-31 | 2013-04-03 | 中冶京诚工程技术有限公司 | Oxygen supply method for oxygen-enriched coal injection of blast furnace |
| CN104099435A (en) * | 2014-07-16 | 2014-10-15 | 首钢总公司 | Oxygen enrichment process and device for providing concentration-adjustable nitrogen and oxygen mixed gas to casing coal injection gun |
| CN104099435B (en) * | 2014-07-16 | 2016-03-02 | 首钢总公司 | For sleeve pipe coal spouting gun provides oxygen enriching process and the device of the adjustable nitrogen oxygen atmosphere of concentration |
| CN106435425A (en) * | 2016-11-28 | 2017-02-22 | 无锡市莱达热工工程有限公司 | Header pipe system of hot galvanizing furnace |
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Application publication date: 20120411 |