CN105295975A - Method for producing high burning reactivity semi-coke powder for blast furnace blowing by using low-order crushed coal - Google Patents
Method for producing high burning reactivity semi-coke powder for blast furnace blowing by using low-order crushed coal Download PDFInfo
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- CN105295975A CN105295975A CN201510810326.5A CN201510810326A CN105295975A CN 105295975 A CN105295975 A CN 105295975A CN 201510810326 A CN201510810326 A CN 201510810326A CN 105295975 A CN105295975 A CN 105295975A
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Abstract
The invention discloses a method for producing high burning reactivity semi-coke powder for blast furnace blowing by using low-order crushed coal. The method comprises the steps of: 1) selecting an additive, mixing the additive with water and leaving a turbid liquid after precipitation, wherein the proportion of the additive and water is 20g: 1L; 2) spraying the turbid liquid obtained in the step 1) into the low-order crushed coal, wherein the additive accounts for 0.5-2.5% by mass of the low-order crushed coal; 3) retorting the low-order crushed coal processed through the step 2) and cooling the crushed coal to room temperature after coke quenching; and 4) grinding the low-order crushed coal processed through the step 3) to obtain high burning reactivity semi-coke powder for blast furnace blowing. According to the method provided by the invention, the high burning reactivity semi-coke powder for blast furnace blowing can be produced by using the low-order crushed coal.
Description
Technical field
The invention belongs to Metallurgical resources comprehensive utilization and coal processing field, be specifically related to a kind of method utilizing low order broken coal to produce the high combustion reactions semi-coke powder of blast furnace blowing.
Background technology
Pulverized coal injection in blast furnace as reducing pig iron cost, alleviate the important technical that environmental pollution and Optimization Technology structure take, extensively paid attention to by domestic and international iron and steel enterprise.In order to take into account coal/burnt substitution rate and the efficiency of combustion of fuel, iron and steel enterprise adopts bituminous coal, hard coal or Mixture Density Networks to carry out blast furnace blowing mostly both at home and abroad at present, and wherein hard coal is the main body coal of winding-up single grade coal or Mixture Density Networks.Along with the continuous growth of China's blast furnace blowing amount, iron and steel enterprise is also growing to anthracitic demand, and hard coal reserves only account for 10.9% of coal in China reserves in addition, and scarcity constantly highlights, high-quality anthracitic price of jetting improves year by year, causes the cost of pulverized coal injection in blast furnace constantly to increase.Therefore, be necessary to seek anthracitic alternative coal of jetting.
In China, account for more than 55% of coal resource total amount with brown coal and the lower-grade metamorphic bituminous low-rank coal reserves for representative, along with the high coal that goes bad is used fewer and fewer, low-rank coal reasonable efficiency utilization day show important.At present, be that the low-rank coal efficient sub-prime ladder transform mode of core is in the industry cycle reached common understanding gradually with low-temperature pyrolysis.Along with the exploitation of the development of low-temperature pyrolysis industry in low-rank coal, the output of semi-coke powder will increase rapidly.Semi-coke powder can not meet the fields such as iron alloy, calcium carbide and MAGNESIUM METAL to the requirement of semicoke granularity, becomes industrial waste in early days and piles and abandon, and is taken as generating at present on a small quantity and domestic fuel uses.Under the situation that steam coal price constantly drops and transportation cost height is looked forward to, semi-coke powder utilizes at traditional energy field does not have obvious cost advantage, and a large amount of semi-coke powder resource faces the problem digested nowhere.Latter stage in 20th century, domestic some scholars and the advantage such as enterprise is high according to the fixed carbon content at blue charcoal end, sulphur content is low, ash content is low, proposition utilizes semi-coke powder as blast furnace blowing raw material, the thinking of the winding-up pulverized anthracite that Substitute For Partial price is high, and has carried out fundamental research and industrial experiment.Result of study shows, semi-coke powder utilize in process at blast furnace blowing have that transportation performance is good, non-explosive and the high advantage of substitution rate, be one of potential excellent blast furnace blowing fuel.But semi-coke powder also also exists grindability index can poor, the inferior position such as ash fusion point is low, especially flammable performance not good seriously limits its application in blast furnace blowing.According to composition and the combustionproperty analysis of semi-coke powder, its alternative comparatively small proportion winding-up hard coal.As in patent 2012103241829 (iron work utilizes the pulverized coal injection into blast furna technique of blue charcoal), semicoke shared maximum ratio in fuel injection is 30%, and this technology can not realize at high proportion even full scale semi-coke powder winding-up.Propellant combination point of ignition can be caused to raise if significantly improve semi-coke powder proportion in blast furnace blowing fuel, the problem that combustionproperty reduces.Commerical test also shows, semi-coke powder, with addition of after in blast furnace blowing fuel, causes blast furnace gravitational dust and final dusting ash increases phenomenon, and this may cause fuel-changing chamber than reducing, and fuel ratio rises, and ton rail fuel cost increases.Therefore, the semi-coke powder that winding-up combustionproperty is not good in a large number can cause the productive capacity of blast furnace to worsen, and in other words, to improve semi-coke powder proportion in fuel injection, even full semi-coke powder winding-up, significantly must improve the combustionproperty of semi-coke powder.
Recently, the thinking (such as paper: " the low-rank coal step for blast furnace blowing transforms the combustionproperty of semicoke ") having investigator to propose the mode of biomass and metallurgical industry solid waste copyrolysis to be improved coal-char combustion performance, but alkali metal content is too high in biomass, basic metal enrichment in blast furnace may be caused; Zn content in blast furnace gas mud is too high, also can cause the zinc enrichment in blast furnace; The grindability index of cold rolling iron scale is very poor, and the grindability index of semicoke can be caused to reduce.Visible, this method is not also suitable in blast furnace ironmaking process, is not also applicable to the method producing high combustion reactions semicoke with low-rank coal of blast furnace blowing at present.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, provide a kind of method utilizing low order broken coal to produce the high combustion reactions semi-coke powder of blast furnace blowing, the method can utilize low order broken coal to produce the high combustion reactions semi-coke powder of blast furnace blowing.
For achieving the above object, the low order broken coal production blast furnace blowing method of high combustion reactions semi-coke powder that utilizes of the present invention comprises the following steps:
1) choose additive, then mixed with water by additive, get suspension liquid after precipitation, wherein, the ratio of additive and water is 20g:1L;
2) by step 1) turbid liquid spraying that obtains is in low order broken coal, and wherein, the quality of additive is 0.5 ~ 2.5% of low order broken coal quality;
3) by through step 2) the low order broken coal that processes carries out destructive distillation, is cooled to room temperature after quenching;
4) by through step 3) the low order broken coal that processes grinds, and obtains the high combustion reactions semi-coke powder of blast furnace blowing.
Step 2) in the granularity of low order broken coal be 5 ~ 15mm.
Described additive is Fe
2o
3, one or more mixtures mixed in any proportion in CaO and converter dust-removing ash.
Step 3) concrete operations be: by through step 2) the low order broken coal that processes is placed into destructive distillation in low-temperature pyrolysis stove, the method for employing dry coke quenching or the method quenching of wet quenching after destructive distillation completes, then room temperature when cooling.
By through step 2) the low order broken coal that processes is placed into destructive distillation in low-temperature pyrolysis stove, and wherein, the temperature of destructive distillation is 540-560 DEG C.
By through step 3) the low order broken coal that processes ground by coal pulverizer, and the quality making particle diameter be less than the semi-coke powder of 74 microns accounts for more than 80% of the quality of total semi-coke powder.
The present invention has following beneficial effect:
The method utilizing low order broken coal to produce blast furnace blowing high combustion reactions semi-coke powder of the present invention with low order broken coal for raw material, the suspension liquid that spraying additive and water are formed in the forward direction low order broken coal of destructive distillation, increase the degree of scatter of additive on coal, thus improve surface and the pore texture of pyrolysis phase low order broken coal, improve the adsorptive power of low order broken coal.At combustion phases, the additive in semi-coke powder has the effect of reaction between carbon and oxygen in catalysis semi-coke powder, thus improves the combustion reactions of semi-coke powder.Through test, the high combustion reactions semi-coke powder point of ignition of blast furnace blowing prepared by the present invention is less than 350 DEG C, and compared with traditional semi-coke powder, rate of combustion increases by 13% ~ 27%, and thermal value improves more than 9%, and Kazakhstan can be ground index (HGI) and be brought up on 60.In addition, method of the present invention not only significantly can improve semi-coke powder proportion in blast furnace blowing fuel, and can improve the grindability index of semicoke, thus improves the coal ejection ratio of blast furnace, reduces coal powder injection cost, and can not cause secondary pollution.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
With reference to figure 1, the low order broken coal production blast furnace blowing method of high combustion reactions semi-coke powder that utilizes of the present invention comprises the following steps:
1) choose additive, then mixed with water by additive, get suspension liquid after precipitation, wherein, the ratio of additive and water is 20g:1L;
2) by step 1) turbid liquid spraying that obtains is in low order broken coal, and wherein, the quality of additive is 0.5 ~ 2.5% of low order broken coal quality;
3) by through step 2) the low order broken coal that processes carries out destructive distillation, is cooled to room temperature after quenching;
4) by through step 3) the low order broken coal that processes grinds, and obtains the high combustion reactions semi-coke powder of blast furnace blowing.
Step 2) in the granularity of low order broken coal be 5 ~ 15mm.
Described additive is Fe
2o
3, one or more mixtures mixed in any proportion in CaO and converter dust-removing ash.
Step 3) concrete operations be: by through step 2) the low order broken coal that processes is placed into destructive distillation in low-temperature pyrolysis stove, the method for employing dry coke quenching or the method quenching of wet quenching after destructive distillation completes, then room temperature when cooling.
By through step 2) the low order broken coal that processes is placed into destructive distillation in low-temperature pyrolysis stove, and wherein, the temperature of destructive distillation is 540-560 DEG C.
By through step 3) the low order broken coal that processes ground by coal pulverizer, and the quality making particle diameter be less than the semi-coke powder of 74 microns accounts for more than 80% of the quality of total semi-coke powder.
Embodiment one
By Fe
2o
3, CaO and converter dust-removing ash be according to the proportional arrangement additive of mass ratio 1:1:1, additive and water are mixed with suspension liquid, be sprayed onto in long flame broken coal according to mass percent 0.5 ~ 2.5% ratio, destructive distillation 30 minutes at the temperature of 550 DEG C, after dry coke quenching, grind to form semi-coke powder, and this semi-coke powder is sprayed in analog blast furnace blowing device.The point of ignition of semi-coke powder is reduced to less than 350 DEG C, and rate of combustion increases by 22% ~ 27%, and thermal value improves more than 13%, and Kazakhstan can be ground index (HGI) and be brought up to more than 60.
Embodiment two
Suspension liquid is sprayed onto in long flame broken coal according to mass percent 0.5 ~ 2.5%, destructive distillation 30 minutes at the temperature of 550 DEG C, after dry coke quenching, grind to form semi-coke powder, and spraying in analog blast furnace blowing device after semi-coke powder, bituminous coal and hard coal are mixed according to the ratio of 75%:15%:10%, the point of ignition of semi-coke powder is reduced to less than 350 DEG C, and rate of combustion increases by 19% ~ 24%, thermal value improves more than 9%, and Kazakhstan can be ground index (HGI) and be brought up to more than 60.
Claims (6)
1. utilize low order broken coal to produce a blast furnace blowing method for high combustion reactions semi-coke powder, it is characterized in that, comprise the following steps:
1) choose additive, then mixed with water by additive, get suspension liquid after precipitation, wherein, the ratio of additive and water is 20g:1L;
2) by step 1) turbid liquid spraying that obtains is in low order broken coal, and wherein, the quality of additive is 0.5 ~ 2.5% of low order broken coal quality;
3) by through step 2) the low order broken coal that processes carries out destructive distillation, is cooled to room temperature after quenching;
4) by through step 3) the low order broken coal that processes grinds, and obtains the high combustion reactions semi-coke powder of blast furnace blowing.
2. the blast furnace blowing method of high combustion reactions semi-coke powder produced by the low order broken coal that utilizes according to claim 1, it is characterized in that, step 2) in the granularity of low order broken coal be 5 ~ 15mm.
3. the blast furnace blowing method of high combustion reactions semi-coke powder produced by the low order broken coal that utilizes according to claim 1, and it is characterized in that, described additive is Fe
2o
3, one or more mixtures mixed in any proportion in CaO and converter dust-removing ash.
4. the method utilizing low order broken coal to produce the high combustion reactions semi-coke powder of blast furnace blowing according to claim 1, it is characterized in that, step 3) concrete operations be: by through step 2) the low order broken coal that processes is placed into destructive distillation in low-temperature pyrolysis stove, the method of employing dry coke quenching or the method quenching of wet quenching after destructive distillation completes, then room temperature when cooling.
5. the method utilizing low order broken coal to produce the high combustion reactions semi-coke powder of blast furnace blowing according to claim 4, it is characterized in that, by through step 2) the low order broken coal that processes is placed into destructive distillation in low-temperature pyrolysis stove, and wherein, the temperature of destructive distillation is 540-560 DEG C.
6. the method utilizing low order broken coal to produce the high combustion reactions semi-coke powder of blast furnace blowing according to claim 1, it is characterized in that, by through step 3) the low order broken coal that processes ground by coal pulverizer, and the quality making particle diameter be less than the semi-coke powder of 74 microns accounts for more than 80% of the quality of total semi-coke powder.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107011961A (en) * | 2017-06-09 | 2017-08-04 | 太原理工大学 | Lignite compound additive and preparation method and the application of civilian clean coke ignition temperature can effectively be reduced |
| CN110982542A (en) * | 2019-11-12 | 2020-04-10 | 北京科技大学 | Method for preparing blast furnace blowing semicoke from low-rank coal based on hydrothermal reaction |
| CN112410092A (en) * | 2020-11-13 | 2021-02-26 | 新奥科技发展有限公司 | Semicoke treatment method and application thereof |
| WO2022011693A1 (en) * | 2020-07-17 | 2022-01-20 | 北京科技大学 | Optimization method for directional preparation technique and efficient use of semi-coke for blast furnace injection |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107011961A (en) * | 2017-06-09 | 2017-08-04 | 太原理工大学 | Lignite compound additive and preparation method and the application of civilian clean coke ignition temperature can effectively be reduced |
| CN110982542A (en) * | 2019-11-12 | 2020-04-10 | 北京科技大学 | Method for preparing blast furnace blowing semicoke from low-rank coal based on hydrothermal reaction |
| WO2022011693A1 (en) * | 2020-07-17 | 2022-01-20 | 北京科技大学 | Optimization method for directional preparation technique and efficient use of semi-coke for blast furnace injection |
| CN112410092A (en) * | 2020-11-13 | 2021-02-26 | 新奥科技发展有限公司 | Semicoke treatment method and application thereof |
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