CN104745753A - Coal blending method of blast-furnace-injected pulverized coal and blast-furnace-injected pulverized coal - Google Patents
Coal blending method of blast-furnace-injected pulverized coal and blast-furnace-injected pulverized coal Download PDFInfo
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Abstract
The invention discloses a coal blending method of blast-furnace-injected pulverized coal and the blast-furnace-injected pulverized coal. The coal blending method comprises the following steps: grinding low-rank coal into the coal powder of the low-rank coal, wherein the coal powder of which the particle size is smaller or equal to 100-mesh bore diameter accounts for 38.05-93.74% of the total weight of the coal powder of the low-rank coal; then mixing the coal powder of the low-rank coal with coal powder of the other coals to obtain the blast-furnace-injected pulverized coal. According to the coal blending method of the blast-furnace-injected pulverized coal, the particle size of the low-rank coal is broadened in the powdering process so as to increase the content of the coal powder whose particle size is smaller or equal to 100-mesh bore diameter in the low-rank coal, so that the explosiveness of the coal powder is reduced and the safety requirements of the blast furnace coal injection are met; thus, the ratio of the low-rank coal in coal blending is increased. Moreover, the dosage of the low-rank coal in the blast-furnace-injected pulverized coal is enlarged, so that the production costs of the iron and steel enterprises are greatly decreased and the economic benefits of the enterprises are increased.
Description
Technical field
The present invention relates to coal blending correlative technology field, particularly a kind of blending method of pulverized coal injection into blast furna and pulverized coal injection into blast furna.
Background technology
Blast furnace blowing fuel is the new technology that modern blast furnace ironmaking production extensively adopts, and is that the modern blast furnace working of a furnace regulates one of indispensable important means.Blast furnace blowing fuel, to reduction coke ratio, reduces pig iron cost, improves blast furnace ironmaking process, thus the every technico-economical comparison of raising blast furnace is useful further.
The quality of blast furnace blowing to coal has certain requirement.Pit ash, sulphur content are low, and thermal value wants high, and grindability index, incendivity, transportation performance will be got well, and explosivity is low, and reactivity will be got well.For a long time, the pulverized coal injection of China generally all adopts hard coal.But through the development of nearest more than ten years, widely use bituminous coal now.From coal situation, hard coal, meager coal, meager lean coal, non caking coal, weakly caking coal, long-flame coal widely use.In addition, also widely use the coal blending of Coal rank, wherein by Coal rank mixture, can maximize favourable factors and minimize unfavourable ones, play the strong point of each coal.
Particularly, the major requirement of blast furnace blowing to coal is as follows:
(1) incendivity is good.After coal dust sprays into blast furnace with air blast from air port, burn in the raceway zone before air port.Because the volume of raceway zone is little, gas speed is very high (before the air port of large blast furnace, wind speed is up to about 270m/s) again, and the residence time of coal dust in raceway zone only has 10-30 millisecond.Within the time of short duration like this, coal dust can not perfect combustion.When coal is than 200kg/t iron, rate of combustion even only has about 50%.The coal combustion that general volatile content is high is better.
(2) explosive low.Use explosive higher coal, powder process and injection system are easily blasted accident, propose stricter requirement, investment and coal powder injection cost are increased to device fabrication and security measures.
Refreshing mansion-the Dongsheng coalfield in China western part is the maximum high-quality non caking coal of China, long-flame coal production base.Ature of coal is stablized and is had the feature of low ash, low-sulfur, low-phosphorous, hyperergy, is the preferred coal of blast furnace blowing bituminous coal.Low-rank coal is special low ash, special low-sulfur, low harmful element, the young bituminous coal of the low metamorphic grade that do not cohere, the suitable coal blending as mixed injection, make the ashes that enter of injection coal divide reduction, ash component is more reasonable.The R0 value (basicity of slag) of low-rank coal ash component is comparatively large, belongs to self-fluxing nature ash content, is conducive to blast furnace operating.High-volatile bituminous coal has the feature such as high combustion rate, hyperergy, and winding-up high volatile low-rank coal, can suppress the melting loss of coke to react, be conducive to the high-temperature behavior improving coke.The advantage of low-rank coal is conducive to making up the deficiency of various hard coal in blast furnace PCI technology performance, can improve the indexs such as the rate of combustion of injection coal, reactivity, increase substantially injecting coal quantity.
But existing low-rank coal as pulverized coal injection into blast furna time, its volatile matter is high, explosive strong, thus limits its chlorine adding ratio in coal blending.
Summary of the invention
Based on this, be necessary that low-rank coal for prior art is in the lower technical problem of the chlorine adding ratio of pulverized coal injection into blast furna, provides a kind of blending method and pulverized coal injection into blast furna of pulverized coal injection into blast furna.
A blending method for pulverized coal injection into blast furna, comprising:
Low-rank coal grinding is obtained low-rank coal coal dust, and in wherein said low-rank coal coal dust, granularity is less than or equal to the weight percent that 100 object coal dusts account for described low-rank coal coal dust is 38.05% ~ 93.74%;
Described pulverized coal injection into blast furna is obtained after being mixed with other coal coal dusts by described low-rank coal coal dust.
A kind of pulverized coal injection into blast furna, comprise and obtain low-rank coal coal dust by low-rank coal grinding, and other coal coal dusts to be obtained by other coal grindings, in wherein said low-rank coal coal dust, granularity is less than or equal to the weight percent that 100 object coal dusts account for described low-rank coal coal dust is 38.05% ~ 93.74%.
The present invention relaxes the granularity of low-rank coal in pulverizing process, granularity in low-rank coal is less than or equal to 100 object coal dust contents and improves, namely thus the explosivity reducing coal dust to reach the safety requirements of pulverized coal injection, thus can improve the chlorine adding ratio of low-rank coal.And then expand low-rank coal as the consumption of pulverized coal injection into blast furna, significantly reduce the production cost of iron and steel enterprise and improve the economic benefit of enterprise.
Accompanying drawing explanation
Fig. 1 is that the size-grade distribution of the low order Firing Shenhua Coal coal dust of different grain size grating compares schematic diagram;
Fig. 2 is the explosive returned fire length of Firing Shenhua Coal and the relation schematic diagram of coal powder size;
Fig. 3 is that Firing Shenhua Coal suppresses the explosive relation schematic diagram adding rock dust amount and coal powder size.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
A blending method for pulverized coal injection into blast furna, comprising:
Low-rank coal grinding is obtained low-rank coal coal dust, and in wherein said low-rank coal coal dust, granularity is less than or equal to the weight percent that 100 object coal dusts account for described low-rank coal coal dust is 38.05% ~ 93.74%;
Described pulverized coal injection into blast furna is obtained after being mixed with other coal coal dusts by described low-rank coal coal dust.
In the blending method of existing pulverized coal injection into blast furna, because low-rank coal volatile matter is high, explosivity strong, therefore in the blending method of existing blast furnace blowing coal blending, low-rank coal is up to about 30% as blast furnace blowing coal blending part by weight.
The present invention relaxes the granularity of low-rank coal in pulverizing process, granularity in low-rank coal is less than or equal to 100 object coal dust contents and improves, thus reduce the explosivity of low-rank coal, therefore can improve the proportion of low-rank coal coal dust in pulverized coal injection into blast furna.Because the cost of low-rank coal is lower, therefore, the production cost of iron and steel enterprise can be reduced, improve the economic benefit of enterprise.
Wherein in an embodiment, in described low-rank coal coal dust, granularity is less than or equal to the weight percent that 200 object coal dusts account for described low-rank coal coal dust is 26.04% ~ 64.11%.
Wherein in an embodiment, the weight percent that described low-rank coal coal dust accounts for described pulverized coal injection into blast furna is 40% ~ 60%.
Low-rank coal coal dust proportion is increased to 40% ~ 60% by existing 30%, the cost of pulverized coal injection into blast furna can be reduced well.
Wherein in an embodiment, the weight percent that described low-rank coal coal dust accounts for described pulverized coal injection into blast furna is 40% ~ 50%, is preferably 45%.
Wherein in an embodiment, described low-rank coal is bottle coal, long-flame coal, non caking coal or weakly caking coal.
The coal classification of GB/T18512-2008 " blast furnace injection coal technical qualification " regulation blast furnace injection coal is hard coal, meager coal, meager lean coal, bottle coal, long-flame coal, non caking coal and weakly caking coal.Wherein hard coal, meager coal, meager lean coal are high-order coal, and bottle coal, long-flame coal, non caking coal and weakly caking coal are low-rank coal, and therefore pulverized coal injection into blast furna can simply be divided into high-order coal, low-rank coal.
The present invention's low-rank coal used can be bottle coal, long-flame coal, non caking coal, weakly caking coal.Such as non-caking coal, the long-flame coal of the coal of refreshing mansion-Dongsheng mine.
Wherein in an embodiment, other coal coal dusts described are by the high-order coal coal dust obtained after high-order coal grinding.
High-order coal used in the methods of the invention has no particular limits and is the high-order coal that those skilled in the art become known for blast furnace blowing.Such as hard coal, meager coal, meager lean coal.The granularity of described high-order coal is known in the field, be generally that the coal dust content being less than or equal to aperture corresponding to 200 eye mesh screens accounts for high-order coal coal dust gross weight 70%.
A kind of pulverized coal injection into blast furna, comprise and obtain low-rank coal coal dust by low-rank coal grinding, and other coal coal dusts to be obtained by other coal grindings, in wherein said low-rank coal coal dust, granularity is less than or equal to the weight percent that 100 object coal dusts account for described low-rank coal coal dust is 38.05% ~ 93.74%.
Wherein in an embodiment, in described low-rank coal coal dust, granularity is less than or equal to the weight percent that 200 object coal dusts account for described low-rank coal coal dust is 26.04% ~ 64.11%.
Wherein in an embodiment, the weight percent that described low-rank coal coal dust accounts for described pulverized coal injection into blast furna is 40% ~ 60%.
Wherein in an embodiment, the weight percent that described low-rank coal coal dust accounts for described pulverized coal injection into blast furna is 40-50%, is preferably 45%.
Wherein in an embodiment, other coals described are high-order coal, and other coal coal dusts described are the high-order coal coal dust obtained by described high-order coal grinding.
Wherein in an embodiment, described high-order coal is hard coal, meager coal or meager lean coal.
In an embodiment of the present invention, unless otherwise stated, all per-cent is all weight percentage.
Explosive test
Explosibility of pulverized coal extensively adopts long-tube explosibility of pulverized coal tester.The returned fire length produced after igniting mainly for detection of coal dust, this length changes with the power of explosibility of pulverized coal.In practical engineering application, it is generally acknowledged, the returned fire length that tested coal dust ignition is formed is greater than 600mm and just can assert that coal dust has intense explosion, between 400-600mm then coal dust have in intensity explosive, be less than 400mm then coal dust there is weak explosivity, if only occur rare Mars at burning things which may cause a fire disaster place or belong to non-explosive coal without Mars.To the test producing flame, also need to do and add rock dust test, till mixed dust no longer occurs flame.
(1) the explosivity research of the low order coal dust of different grain size level
By sieve shaker and normal test sieve, the long-flame coal that Shenhua produces is sieved out 7 particle size fraction coal dusts, and carry out explosivity test, test result is as shown in table 1 below.
The explosivity of table 1 different grain size level low-rank coal coal dust
Wherein, order refers to the empty eye number on every square of English inch screen cloth, and coal powder size can represent with order number usually.Therefore, granularity is less than or equal to 200 orders, and the particle diameter referring to coal dust is less than or equal to the aperture corresponding to 200 orders.Granularity is less than or equal to 100 orders, and the particle diameter referring to coal dust is less than or equal to the aperture corresponding to 100 orders.
It can be seen from the table, along with the increase of coal powder size, the explosivity of coal dust dies down gradually, until become non-explosive.When coal powder size is less than or equal to 200 order, low order coal coal dust demonstrates intense explosion, returned fire length >400mm, and the rock dust amount need adding 80% could suppress explosive; When coal powder size increases to 200-150 order, although its returned fire length still >400mm, explosive rock dust amount of adding is suppressed to be down to 60%; When coal powder size increases to 150-115 order, the explosivity of coal dust significantly reduces, and returned fire length is down to 180mm; Granularity increases to 100-60 order again, non-explosive.As can be seen here, when coal powder size increases to specified particle size, the explosivity of coal dust reduces even non-explosive.
(2) the explosivity research of different grain size grating coal dust
Prepared the coal dust of the Shenhua low-rank coal of 9 different grain size gratings with experiment ball mill, and carried out being less than or equal to 200 object coal dust ratios and the testing graininess being less than or equal to 100 object coal dust ratios to it with sieve shaker, experimental result is in table 2.These 9 coal powder sizes are minimum accounts for 26.04% for being less than or equal to 200 object coal dust ratios, is to the maximum and is less than or equal to 200 object coal dust ratios 100%.Also particle size distribution test has been carried out to these 9 varigrained coal dust laser fineness gages simultaneously, size-grade distribution relatively see Fig. 1.Curve in Fig. 1 is size frequency distribution curve, and each curve represents a coal dust, can find out, the size rule of size-grade distribution and the sieve size size rule of sieve shaker are on all four.Along with the increase being less than or equal to 200 order coal dust contents, the spike of curve of frequency distribution is moved to the left gradually.Fig. 2 is the explosive returned fire length of Firing Shenhua Coal and the relation of coal powder size.Fig. 3 is that Firing Shenhua Coal suppresses the explosive relation adding rock dust amount and coal powder size.
The sieve size composition with Shenhua low-rank coal coal dust tested by table 2
Can find from Fig. 1-3, when the granularity (being less than or equal to 200 object coal dust ratios) of Shenhua low-rank coal is when 35-40% is interval, the explosivity of coal dust has obvious step feature, the explosivity of coal dust suddenly increases, the explosive returned fire length being the coal dust of 31.28% as granularity (being less than or equal to 200 object coal dust ratios) is 50mm, suppressing explosivity to add rock dust amount is 30%, granularity (being less than or equal to 200 object coal dust ratios) is that the explosive returned fire length of the coal dust of 39.19% then increases to 300mm suddenly, suppressing explosivity to add rock dust amount is 50%.
Following example is improve the granularity of Shenhua low-rank coal and the Coal Blending Schemes of other coal:
As the above analysis, the granularity improving Shenhua low-rank coal can reduce its explosivity, if the granularity of the Shenhua low-rank coal therefore improved in coal blending also can reduce the explosivity of coal blending.For this reason, the Coal Blending Schemes originally having studied and defined varigrained Shenhua low-rank coal and Taixi anthracite coal and Korea's hard coal coal is tested, and the coal analysis of sample is in table 3.Coal Blending Schemes and explosibility test result as shown in table 4.
The coal analysis of table 3 sample
In upper table 3, M
arfor moisture as received coal content in coal, M
adfor air-dried moisture content, A
dfor dry basis ash content content, V
dfor butt volatile producibility, V
daffor dry ash-free basis volatile producibility, FC
dfor butt fixed carbon productive rate, CRC is characteristic of char residue, and S, C, H, N are respectively the content of elementary sulfur, carbon, hydrogen, nitrogen, and HGI is the Kazakhstan grindability index of coal, R
maxfor the vitrinite reflectance of the coal of coal, K, Na total amount is the content of potassium, sodium element in coal.
Coal Blending Schemes and the explosive combustion of the same too western coal of table 4 varigrained Shenhua low-rank coal, Korea's coal are tested
As can be seen from the test results, when the coal blending of Firing Shenhua Coal is 45%, the granularity of low order Firing Shenhua Coal in coal blending is amplified to and is less than or equal to 200 object coal dust contents and accounts for 54.69%, explosivity less (general industry requires that explosive returned fire length is less than 30mm), incendivity is also better simultaneously, is not decreased significantly.
Therefore, when by the chlorine adding ratio of low order Firing Shenhua Coal in coal blending by original be less than or equal to 200 object coal dust contents account for 70% be increased to be less than or equal to 200 object coal dust contents account for 54.69% and 56.72% time, the chlorine adding ratio of low order Firing Shenhua Coal in pulverized coal injection into blast furna can be increased to 45% by original about 30%, and this coal blending explosivity is low, and incendivity is good.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a blending method for pulverized coal injection into blast furna, is characterized in that, comprising:
Low-rank coal grinding is obtained low-rank coal coal dust, and in wherein said low-rank coal coal dust, granularity is less than or equal to the weight percent that 100 object coal dusts account for described low-rank coal coal dust is 38.05% ~ 93.74%;
Described pulverized coal injection into blast furna is obtained after being mixed with other coal coal dusts by described low-rank coal coal dust.
2. the blending method of pulverized coal injection into blast furna according to claim 1, is characterized in that, in described low-rank coal coal dust, granularity is less than or equal to the weight percent that 200 object coal dusts account for described low-rank coal coal dust is 26.04% ~ 64.11%.
3. the blending method of pulverized coal injection into blast furna according to claim 1, the blending method of pulverized coal injection into blast furna, is characterized in that, the weight percent that described low-rank coal coal dust accounts for described pulverized coal injection into blast furna is 40% ~ 60%.
4. the blending method of pulverized coal injection into blast furna according to claim 3, is characterized in that, described low-rank coal is bottle coal, long-flame coal, non caking coal or weakly caking coal.
5. the blending method of the pulverized coal injection into blast furna according to any one of Claims 1 to 4, is characterized in that, other coal coal dusts described are by the high-order coal coal dust obtained after high-order coal grinding.
6. a pulverized coal injection into blast furna, it is characterized in that, comprise and obtain low-rank coal coal dust by low-rank coal grinding, and other coal coal dusts to be obtained by other coal grindings, in wherein said low-rank coal coal dust, granularity is less than or equal to the weight percent that 100 object coal dusts account for described low-rank coal coal dust is 38.05% ~ 93.74%.
7. pulverized coal injection into blast furna according to claim 6, is characterized in that, in described low-rank coal coal dust, granularity is less than or equal to the weight percent that 200 object coal dusts account for described low-rank coal coal dust is 26.04% ~ 64.11%.
8. pulverized coal injection into blast furna according to claim 6, is characterized in that, the weight percent that described low-rank coal coal dust accounts for described pulverized coal injection into blast furna is 40% ~ 60%.
9. pulverized coal injection into blast furna according to claim 8, is characterized in that, described low-rank coal is bottle coal, long-flame coal, non caking coal or weakly caking coal.
10. the pulverized coal injection into blast furna according to any one of claim 6 ~ 9, is characterized in that, other coals described are high-order coal, and other coal coal dusts described are the high-order coal coal dust obtained by described high-order coal grinding.
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