CN103834755A - Pulverized coal preheating technique of blast furnace coal injection system - Google Patents
Pulverized coal preheating technique of blast furnace coal injection system Download PDFInfo
- Publication number
- CN103834755A CN103834755A CN201410070774.1A CN201410070774A CN103834755A CN 103834755 A CN103834755 A CN 103834755A CN 201410070774 A CN201410070774 A CN 201410070774A CN 103834755 A CN103834755 A CN 103834755A
- Authority
- CN
- China
- Prior art keywords
- coal
- pulverized coal
- pulverized
- furnace
- coal dust
- 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
Landscapes
- Manufacture Of Iron (AREA)
Abstract
The invention provides a pulverized coal preheating technique of a blast furnace coal injection system. The pulverized coal preheating technique comprises the steps that raw coal in a coal bunker is conveyed to a coal pulverizer through a coal feeder, after the raw coal is pulverized into pulverized coal in the coal pulverizer, pulverized coal is conveyed to a dust remover through flue gas from a hot-blast stove chimney and a flue gas furnace, further enters a pulverized coal bunker through a vibrating screen and is stored, the pulverized coal enters an injection tank in batches and is conveyed to a blast furnace tuyere by adopting concentrated phase air force through the injection tank, and a pulverized coal bunker preheating technique and a pulverized coal conveying preheating technique are carried out by using high temperature exhaust gas generated by the fuel gas furnace on the basis of a conventional coal powder injection system. The pulverized coal preheating technique has the advantages that the temperature of pulverized coal can be increased, the time of heating pulverized coal before the tuyere to ignition point is greatly shortened, the burning time of the pulverized coal in the tuyere and a raceway are increased, so that the burning rate of the pulverized coal is increased.
Description
Technical field
The present invention relates to Pulverized Coal Injection System with Fuzzy technical field, relate in particular to a kind of bf coal injection system pulverized coal preheating processing method.
Background technology
Pulverized coal injection not only can replace coke, reduces pig iron cost, reduces the pollution of process of coking to environment, simultaneously it or the modern blast furnace working of a furnace regulates one of indispensable important means.Therefore, under the stable prerequisite of blast furnace production basic condition, how to improve Coal Injection Rate at BF, become the most important thing of optimizing industrial structure and improve the performance of enterprises.
In pulverized coal injection process, coal dust is entering after the belly pipe of air port to leaving air port oxidation zone, and the residence time is very of short duration, and only less than the time of 0.2 second, the coal dust that enters blast furnace must during this period of time complete intensification, decompose and burning.At present, the pulverized coal injection operation overwhelming majority is that the technology such as oxygen enriched blast improve coal ejection ratio by improving wind-warm syndrome.But due to blast furnace production process complexity, existing theoretical investigation is limited, take merely to improve wind-warm syndrome, the measures such as oxygen enriched blast can bring again the interior theoretical combustion temperature of stove too high, coal gas volume increases, actual flow velocity is too high, increases pressure drop in furnace, the reduction of coal gas amount, and shaft portion furnace charge heats the problems such as variation and then affects blast furnace normally to be produced.The another kind of method generally adopting is the initial temperature that arrives air port place by improving coal dust, after making its arrival air port enter oxidation zone, temperature can rise to rapidly Coal Powder Ignition Point burning, thereby shorten the coal dust firing time, do not affect again normal production in stove, and then improve blast furnace and produce coal ejection ratio.
The pulverized coal preparation that domestic coal powder injection generally adopts and blowing process coal pulverizer are that raw coal is processed into the coal dust that granularity and water content all meet blast furnace blowing needs, and the mode that the winding-up tank being arranged in juxtaposition adds divider by coal dust by supervisor is delivered to blast-furnace tuyere spray gun and sprayed into blast furnace.In this process, coal dust arrives the temperature of Pulverized Coal Bin and is down to 60 DEG C of left and right, can reduce again to temperature behind air port through long-distance transportation through pipeline, and this has just extended the combustion time of coal dust greatly, even can not fully burn, and produces reduction coal ejection ratio thereby affect blast furnace.The measure of taking is at present to use steam to use coil pipe to be incubated as heating medium to Pulverized Coal Bin, alleviates coal dust cooling in storehouse.The more important thing is, as heating medium, breeze blowing pressurising fluidisation nitrogen and helping is blown and heated with nitrogen or pressurized air with steam, by steam, breeze blowing is carried out to heating and thermal insulation by gas heating with in the way of the logical steam insulation of Pulverized Coal Bin bottom coil pipe to coal dust, the temperature that makes it arrive air port place is high as far as possible.But the shortcoming of this method is, first need additionally to increase a whole set of delivery of steam and condensed water collecting device, increase cost of investment, secondly because vapour source is uncertain from the distance of coal injection system in practice, the length of distance is larger on the temperature impact of arrival hot spot, and the temperature that is often delivered to hot spot does not reach 200 DEG C, and leaks hidden danger because steam-pipe exists, the steam of revealing freezes in easy condensation in winter, is unfavorable for heating and thermal insulation and equipment steady running to coal dust.
For above-mentioned problem, the present invention is intended to design a kind of simple and effective processing method, can effectively avoid or reduce the problem of above-mentioned appearance.
Summary of the invention
Technical problem to be solved by this invention is the technical deficiency to above-mentioned existence just, a kind of coal dust temperature that improves is provided, significantly shorten the time that coal dust is heated to point of ignition before air port, increase coal dust is in the combustion time in air port and convolution district, thereby improve the rate of combustion of coal dust, and then improve the bf coal injection system pulverized coal preheating processing method of injecting coal quantity.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of bf coal injection system pulverized coal preheating processing method, include the raw coal of coal bunker is delivered to coal pulverizer by feeder, wear into after coal dust at coal pulverizer, the temperature of origin self-heating wind furnace chimney and combustion gas furnace is delivered to fly-ash separator up to the flue gas of 240 ~ 350 DEG C by coal dust, coal dust further enters Pulverized Coal Bin by vibratory screening apparatus and stores, and enter in batches winding-up tank, adopt concentrated phase air conveying to blast-furnace tuyere coal dust by winding-up tank, it is characterized in that: on existing coal injection system basis, the high-temp waste gas that utilizes combustion gas furnace to produce, carry out Pulverized Coal Bin pre-heating technique, and coal dust is carried pre-heating technique,
Wherein, described Pulverized Coal Bin pre-heating technique is: coil pipe is set in Pulverized Coal Bin and is communicated with the vapor pipe of combustion gas furnace, and to draw temperature be that the combustion gas furnace flue gas of 240 ~ 350 DEG C accompany heat as companion's thermal medium to Pulverized Coal Bin, in maintenance Pulverized Coal Bin, the temperature of coal dust is 80 DEG C ~ 100 DEG C left and right.
Described coal dust carries pre-heating technique to include following two stages:
First by pipeline, interchanger is communicated with the vapor pipe of combustion gas furnace, drawing from the temperature of fume furnace outlet is that the high-temp waste gas of 240 ~ 350 DEG C is as the thermal medium of interchanger, the delivering gas of carrying for coal dust is as the cold medium of interchanger, and the transportation gas temperature after heating by heat exchange is up to 200 DEG C of left and right.
Then the delivering gas after heating enters winding-up tank as punching press and fluidizing agent coal dust is carried out to preheating, and the delivering gas after heating continues coal dust to carry out preheating in course of conveying afterwards, makes the top temperature of coal dust in the time entering before air port can reach 150 DEG C.
In such scheme, described delivering gas is nitrogen or pressurized air.
The principle of work of technique of the present invention is: directly draw flue gas respectively as the thermal source of breeze blowing gas heating and insulation from fume furnace outlet, carry out Pulverized Coal Bin preheating, and two committed steps of coal dust conveying preheating, thereby can significantly improve the top temperature of coal dust in the time entering before air port.
Tool of the present invention has the following advantages:
1. use combustion gas furnace flue gas to replace steam to carry out heating and thermal insulation to coal dust, fume furnace outlet flue gas normal temps is 240 ~ 350 DEG C of left and right, and heating source is short to the distance of hot spot, all belong to coal injection system, heating source is reliable and stable, can effectively ensure that the temperature value of hot spot is up to standard, high, effective to the heating and thermal insulation efficiency of coal dust;
2. the combustion gas furnace flue gas in the heating source of quoting in normal productive process, it is 90% from blast-furnace hot-air furnace exhaust, and being conducive to turns waste into wealth, and resource circulation utilization is energy-saving and cost-reducing;
3. this technical process is simple, equipment easy care, and investment, working cost is few.
Brief description of the drawings
Fig. 1 is embodiment of the present invention architecture schematic diagram;
In figure: 1-coal pulverizer, 2-hotblast stove chimney, 3-combustion gas furnace, 4-fly-ash separator, 5-Pulverized Coal Bin, the 6-tank of jetting, 7-interchanger, 8-vibratory screening apparatus, 9-blast-furnace tuyere.
Embodiment
Below in conjunction with embodiment, the embodiment of the present invention is further described:
Bf coal injection system pulverized coal preheating processing method as shown in Figure 1, includes following steps:
The raw coal of coal bunker is delivered to coal pulverizer 1 by feeder, wear into after coal dust at coal pulverizer 1, coal dust is delivered to fly-ash separator 4 by the flue gas of the temperature of origin self-heating wind furnace chimney 2 and combustion gas furnace 3 up to 240 ~ 350 DEG C, coal dust further enters Pulverized Coal Bin 5 by vibratory screening apparatus 8 and stores, and carry out Pulverized Coal Bin 5 pre-heating techniques, then and in batches enter winding-up tank 6, adopt nitrogen to be delivered to blast-furnace tuyere 9 coal dust by winding-up tank 6, in the process of carrying, carry out coal dust and carry pre-heating technique.
Wherein, described Pulverized Coal Bin pre-heating technique is: in the ash bucket of fly-ash separator 4 and Pulverized Coal Bin 5, coil pipe is set and is communicated with the vapor pipe of combustion gas furnace 3, and to draw temperature be that combustion gas furnace 3 flue gases of 240 ~ 350 DEG C accompanys heat as the ash bucket of companion's thermal medium to fly-ash separator 4 and Pulverized Coal Bin 5, in the ash bucket of maintenance fly-ash separator 4 and Pulverized Coal Bin 5, the temperature of coal dust is 80 DEG C ~ 100 DEG C left and right.
Described coal dust carries pre-heating technique to include following two stages:
First by pipeline, interchanger 7 is communicated with the vapor pipe of combustion gas furnace 3, draw the temperature exporting from combustion gas furnace 3 and be the high-temp waste gas of 240 ~ 350 DEG C as the thermal medium of interchanger 7, the nitrogen of carrying for coal dust is as the cold medium of interchanger, and the nitrogen temperature after heating by heat exchange is up to 200 DEG C of left and right.
Then the nitrogen after heating enters winding-up tank 6 as punching press and fluidizing agent coal dust is carried out to preheating, and the nitrogen after heating continues coal dust to carry out preheating in course of conveying afterwards, makes coal dust can reach 150 DEG C entering the top temperature of blast-furnace tuyere 9 when front.
Protection scope of the present invention is not limited to the above embodiments, and obviously, those skilled in the art can carry out various changes and distortion and not depart from the scope of the present invention and spirit the present invention.If these changes and distortion belong in the scope of the claims in the present invention and equivalent technologies thereof, the intent of the present invention also comprises these changes and is out of shape interior.
Claims (2)
1. a bf coal injection system pulverized coal preheating processing method, include the raw coal of coal bunker is delivered to coal pulverizer by feeder, wear into after coal dust at coal pulverizer, the temperature of origin self-heating wind furnace chimney and combustion gas furnace is delivered to fly-ash separator up to the flue gas of 240 ~ 350 DEG C by coal dust, coal dust further enters Pulverized Coal Bin by vibratory screening apparatus and stores, and enter in batches winding-up tank, adopt concentrated phase air conveying to blast-furnace tuyere coal dust by winding-up tank, it is characterized in that: on existing coal injection system basis, the high-temp waste gas that utilizes combustion gas furnace to produce, carry out Pulverized Coal Bin pre-heating technique, and coal dust is carried pre-heating technique,
Wherein, described Pulverized Coal Bin pre-heating technique is: in the ash bucket of fly-ash separator and Pulverized Coal Bin, coil pipe is set and is communicated with the vapor pipe of combustion gas furnace, and to draw temperature be that the combustion gas furnace flue gas of 240 ~ 350 DEG C accompany heat as the ash bucket of companion's thermal medium to fly-ash separator and Pulverized Coal Bin, in the ash bucket of maintenance fly-ash separator and Pulverized Coal Bin, the temperature of coal dust is at 80 DEG C ~ 100 DEG C;
Described coal dust carries pre-heating technique to include following two stages:
First by pipeline, interchanger is communicated with the vapor pipe of combustion gas furnace, drawing from the temperature of fume furnace outlet is that the high-temp waste gas of 240 ~ 350 DEG C is as the thermal medium of interchanger, the delivering gas of carrying for coal dust is as the cold medium of interchanger, and the transportation gas temperature after heating by heat exchange is up to 200 DEG C;
Then the delivering gas after heating enters winding-up tank as punching press and fluidizing agent coal dust is carried out to preheating, and the delivering gas after heating continues coal dust to carry out preheating in course of conveying afterwards, makes the top temperature of coal dust in the time entering before air port can reach 150 DEG C.
2. bf coal injection system pulverized coal preheating processing method as claimed in claim 1, is characterized in that: described delivering gas is nitrogen or pressurized air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410070774.1A CN103834755A (en) | 2014-02-28 | 2014-02-28 | Pulverized coal preheating technique of blast furnace coal injection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410070774.1A CN103834755A (en) | 2014-02-28 | 2014-02-28 | Pulverized coal preheating technique of blast furnace coal injection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103834755A true CN103834755A (en) | 2014-06-04 |
Family
ID=50798648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410070774.1A Pending CN103834755A (en) | 2014-02-28 | 2014-02-28 | Pulverized coal preheating technique of blast furnace coal injection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103834755A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509084A (en) * | 2016-01-29 | 2016-04-20 | 叶立英 | Method and system for heating boiler intake air and coal powder carried by intake air |
| CN107119160A (en) * | 2017-07-10 | 2017-09-01 | 中冶华天南京工程技术有限公司 | A kind of blast-furnace coal powder injection method preheated with compressed gas and system |
| CN109252006A (en) * | 2018-11-12 | 2019-01-22 | 武汉钢铁有限公司 | The coal powder injection apparatus of blast furnace and its control method of controllable medium-speed pulverizer entrance oxygen content |
| CN110205422A (en) * | 2019-07-19 | 2019-09-06 | 武汉摩林翰机电设备有限公司 | Blast-furnace coal powder preheats injection system |
| CN112046949A (en) * | 2020-09-17 | 2020-12-08 | 中天钢铁集团有限公司 | Raw coal bunker coal feeding device and coal breakage preventing method thereof |
| CN113786921A (en) * | 2021-08-27 | 2021-12-14 | 中冶南方工程技术有限公司 | Blast furnace pulverized coal preheating system based on raw coal processing technology |
| CN114657296A (en) * | 2022-03-30 | 2022-06-24 | 中冶华天南京工程技术有限公司 | Multi-stage preheating injection system and method for blast furnace fuel of iron and steel enterprise |
| CN115540573A (en) * | 2021-06-29 | 2022-12-30 | 五矿营口中板有限责任公司 | Safe powder preparation method of high-volatile bituminous coal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2591047Y (en) * | 2002-12-31 | 2003-12-10 | 中冶集团北京钢铁设计研究总院 | Hot-blast furnace waste gas comprehensive utilizing device |
| CN101058081A (en) * | 2006-04-17 | 2007-10-24 | 中冶京诚工程技术有限公司 | Blast furnace blowing bituminous coal grinding machine system and its smoke non-dewatering self-circulation technology |
| CN201168519Y (en) * | 2008-03-28 | 2008-12-24 | 上海宝钢工程技术有限公司 | High temperature coal gas bag-type dust remover |
-
2014
- 2014-02-28 CN CN201410070774.1A patent/CN103834755A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2591047Y (en) * | 2002-12-31 | 2003-12-10 | 中冶集团北京钢铁设计研究总院 | Hot-blast furnace waste gas comprehensive utilizing device |
| CN101058081A (en) * | 2006-04-17 | 2007-10-24 | 中冶京诚工程技术有限公司 | Blast furnace blowing bituminous coal grinding machine system and its smoke non-dewatering self-circulation technology |
| CN201168519Y (en) * | 2008-03-28 | 2008-12-24 | 上海宝钢工程技术有限公司 | High temperature coal gas bag-type dust remover |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509084A (en) * | 2016-01-29 | 2016-04-20 | 叶立英 | Method and system for heating boiler intake air and coal powder carried by intake air |
| CN107119160A (en) * | 2017-07-10 | 2017-09-01 | 中冶华天南京工程技术有限公司 | A kind of blast-furnace coal powder injection method preheated with compressed gas and system |
| CN109252006A (en) * | 2018-11-12 | 2019-01-22 | 武汉钢铁有限公司 | The coal powder injection apparatus of blast furnace and its control method of controllable medium-speed pulverizer entrance oxygen content |
| CN110205422A (en) * | 2019-07-19 | 2019-09-06 | 武汉摩林翰机电设备有限公司 | Blast-furnace coal powder preheats injection system |
| CN112046949A (en) * | 2020-09-17 | 2020-12-08 | 中天钢铁集团有限公司 | Raw coal bunker coal feeding device and coal breakage preventing method thereof |
| CN112046949B (en) * | 2020-09-17 | 2022-04-26 | 中天钢铁集团有限公司 | Raw coal bunker coal feeding device and coal breakage preventing method thereof |
| CN115540573A (en) * | 2021-06-29 | 2022-12-30 | 五矿营口中板有限责任公司 | Safe powder preparation method of high-volatile bituminous coal |
| CN113786921A (en) * | 2021-08-27 | 2021-12-14 | 中冶南方工程技术有限公司 | Blast furnace pulverized coal preheating system based on raw coal processing technology |
| CN113786921B (en) * | 2021-08-27 | 2023-02-24 | 中冶南方工程技术有限公司 | Blast furnace pulverized coal preheating system based on raw coal processing technology |
| CN114657296A (en) * | 2022-03-30 | 2022-06-24 | 中冶华天南京工程技术有限公司 | Multi-stage preheating injection system and method for blast furnace fuel of iron and steel enterprise |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103834755A (en) | Pulverized coal preheating technique of blast furnace coal injection system | |
| CN102353276B (en) | Waste heat comprehensive utilization power generation system and power generation method for sintering production line | |
| CN103133067A (en) | Steel-mill residual blast-furnace gas and residual saturated steam comprehensive utilization power generation system | |
| CN102605119B (en) | Coal dust conveying during a kind of pulverized coal injection in blast furnace and pre-heating technique device | |
| CN202419677U (en) | Dry slagging cooling air processing system | |
| CN102183152A (en) | Steel enterprise associated energy combined cycle power generation system and method | |
| CN103954139A (en) | Sintering complementary energy power generation system | |
| CN203534229U (en) | Power generating system for quick cooling granulating of molten slag and waste heat recovery | |
| CN201770652U (en) | Semi-coke dry quenching system | |
| CN110129497A (en) | Pulverized coal injection in blast furnace is connected pre-heating technique and system with hot-blast stove air/gas | |
| CN203615314U (en) | New energy-saving system of semi-hermetic submerged arc furnace | |
| CN110157845B (en) | Blast furnace mineral powder injection method and system | |
| CN202074693U (en) | Combustible waste gas reuse hot blast stove | |
| CN201598322U (en) | Decarburizing device for vanadium extraction from stone coal | |
| CN103993110B (en) | Pulverized coal injection in blast furnace pre-heating technique | |
| CN201620039U (en) | Heating system of production process of potassium manganate | |
| CN204079999U (en) | A kind of novel blast-furnace Coalblowing system | |
| CN208805029U (en) | A kind of melting hot air furnace device | |
| CN202576449U (en) | Coal dust conveying and preheating process apparatus in coal injection process of blast furnace | |
| CN102607286A (en) | Molten salt furnace afterheat power-generation and combustion comprehensive utilizing system | |
| CN202066365U (en) | Preheating furnace pre-positioned type blast furnace gas ignition furnace | |
| CN204165407U (en) | A kind of sintered discharge gas waste heat recycling system | |
| CN205528868U (en) | Blast furnace gas uses multipurposely facility | |
| CN205208551U (en) | A boiler structure for burning remove dust in middle of gangue | |
| CN205170757U (en) | Power generation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140604 |