CN104232241B - A kind of additive for fire coal and preparation method thereof - Google Patents
A kind of additive for fire coal and preparation method thereof Download PDFInfo
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- CN104232241B CN104232241B CN201410536296.9A CN201410536296A CN104232241B CN 104232241 B CN104232241 B CN 104232241B CN 201410536296 A CN201410536296 A CN 201410536296A CN 104232241 B CN104232241 B CN 104232241B
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Abstract
The present invention relates to a kind of additive for fire coal and preparation method thereof.Its technical scheme is: raw material and the content thereof of additive for fire coal is: catalyst is 40 ~ 55wt%, and oxidant is 25 ~ 35wt%, and sodium chloride is 10 ~ 20wt%, and metasilicate pentahydrate sodium is 2 ~ 6wt%, and sodium lignin sulfonate is 0.05 ~ 0.15wt%.By described raw material and content thereof: be first that sodium lignin sulfonate is dissolved in the water by 1 (2 ~ 4) by solid-liquid mass ratio, prepare grinding aid solution；Again prepared grinding aid solution is sprayed at catalyst surface equably, in grinding in ball grinder to particle diameter less than 100 μm, the fine powder after being ground；Then the fine powder after grinding is mixed with oxidant, sodium chloride, metasilicate pentahydrate sodium and the water for raw materials quality 2 ~ 4 times, high-speed stirred on shear mixer, obtain additive for fire coal.The present invention have with low cost, economize on resources and eco-friendly feature, the additive for fire coal of preparation is easy to use, combustion efficiency good and easy to spread, it is adaptable to cement industry kiln.
Description
Technical field
The invention belongs to coal combustion technology field.It is specifically related to a kind of additive for fire coal and preparation method thereof.
Background technology
At present, study and apply the various clean coal technology being suitable for China's national situation, improve coal utilization efficiency, reduce the discharge of the harmful gas such as sulfur dioxide, nitrogen oxides and flue dust, realize one of energy sustainable development strategy, the effective measures solving air environmental pollution by becoming country.Although China's coal-mine is of a great variety, aboundresources, but it is narrower to can adapt to the coal scope of new type nonaqueous cement industry, large and medium-sized enterprise's many uses relatively high-quality bituminous coal in China's cement industry, to increase the calorific value of coal dust, it is prevented that the bonding of kiln tail system and formation rings in a kiln.But for comprehensive utilization resource and economic benefit, to utilizing low-volatite coal and ash coal, cement industry carries again obligation one can't decline.
In recent years, cement kiln many employings low activity is coal-fired in the world, China's cement kiln also can to utilizing tinpot coal, the development of the aspect of production cost of making rational use of resources, reduce.But low volatile and ash coal are for precalciner kiln, because it is flammable poor, burning velocity is slow, and ignition temperature is high, and it is insufficient to burn, and these defects all can bring the factors of instability to manufacture of cement.It addition, cement industry is coal-fired lavish consumer, its NOx discharge has been only second to China's thermoelectricity and vehicle exhaust, occupies the third-largest discharge family, and Environmental Protection Situation is increasingly severe.
In order to make up disadvantages described above, a lot of technical staff develop different additives, but owing to these additives are expensive or poor effect, or do not adapt to the productive prospecting of cement industry, cause hardly resulting in popularization and application.
Summary of the invention
It is contemplated that overcome prior art defect, it is therefore an objective to provide a kind of with low cost, economize on resources and the preparation method of eco-friendly additive for fire coal, the additive for fire coal prepared by the method is easy to use, combustion efficiency good and application easy to spread.
For achieving the above object, the technical solution used in the present invention is: raw material and the content thereof of additive for fire coal is: catalyst is 40 ~ 55wt%, and oxidant is 25 ~ 35wt%, and sodium chloride is 10 ~ 20wt%, metasilicate pentahydrate sodium is 2 ~ 6wt%, and sodium lignin sulfonate is 0.05 ~ 0.15wt%.
By the raw material of described additive for fire coal and content thereof: be first that sodium lignin sulfonate is dissolved in the water by 1 (2 ~ 4) by solid-liquid mass ratio, prepare grinding aid solution；Prepared grinding aid solution is sprayed at equably catalyst surface, then the catalyst after grinding aid solution will be sprayed in grinding in ball grinder to particle diameter less than 100 μm, the fine powder after being ground；Then the fine powder after grinding is mixed with oxidant, sodium chloride, metasilicate pentahydrate sodium and the water for raw materials quality 2 ~ 4 times, high-speed stirred on shear mixer, obtain additive for fire coal.
In described catalyst: slag is 25 ~ 35wt%；Steel desulfurization slag is 10 ~ 20wt%；Cold rolling oxidation scum is 20 ~ 30wt%；Chromium slag is 5 ~ 15wt%；Manganese mine tailing is 5 ~ 15wt%；Manganese dioxide is 5 ~ 10wt%.
In described oxidant: potassium permanganate is 45 ~ 55wt%；Potassium hyperchlorate is 45 ~ 55wt%.
Owing to adopting technique scheme, the present invention compared with prior art has the positive effect that:
The present invention utilizes industrial residue to make catalyst, turns waste into wealth, and greatly reduces cost of material, economizes on resources, environmental friendliness.Slag in the present invention, steel desulfurization slag, cold rolling oxidation scum, chromium slag and manganese mine tailing contain substantial amounts of alkali metal and transition metal oxide, the addition of these oxides, poor in the two opposite polarity ionization potential of alternate formation, thus reducing original electromotive force, reducing the activation energy that burning is required, making the ignition temperature of reaction reduce, burning is more easy to and carries out, thus accelerating coal combustion speed, promoting the burning completely of coal dust, improve efficiency of combustion.Metal-oxide can change the physical aspect of coal dust or coke surface simultaneously, and then strengthens coal dust or coke to NOXAbsorption, promote coke heterogeneous reduction reaction；Coal dust or coke metal oxide-loaded after, it is possible to reducing the activation energy of the heterogeneous reduction reaction of coke, and then making out-phase reaction rate improve, thus playing catalytic denitration effect.So after adding catalyst, ignition temperature reduces 7.2 ~ 16.5 DEG C, and after-flame degree improves 2.3 ~ 6.5%, and discharged nitrous oxides decreases 6.8 ~ 22.8%.
Potassium permanganate and potassium hyperchlorate in the present invention can progressively decompose the active oxygen of precipitation at different temperature sections, not only increase the contact area of fixed carbon and oxygen, promote the burning completely of fixed carbon, and the carbon granules of the fuel gas in after-flame flue gas and suspension is played very big effect, thus reduce the consumption of coal and the blackness of flue gas；The manganese dioxide generated after potassium permanganate burning is again the catalyst of oxidation reaction, can promote again the carrying out of oxidation reaction.Potassium hyperchlorate finally decomposes the potassium chloride of generation can also play the effect that catalysis is burnt.
Sodium chloride in the present invention at high temperature can instantaneous expansion, make fire coal be in fluffy state, increasing specific surface area, increase oxygen supply face, make burning more abundant.Meanwhile, when temperature reaches 800 DEG C, sodium chloride can resolve into SODIUM METAL and chlorine, sodium and chlorine and all have catalytic combustion-supporting effect.
What the metasilicate pentahydrate sodium in the present invention played is peptizaiton.After adding metasilicate pentahydrate sodium, in additive, other auxiliary agents can better be dispersed in water, and mixing evenly, improves the utilization ratio of additive.
Sodium lignin sulfonate in the present invention is typical lignin sulfonate, has good grind-aiding effect.Sodium lignin sulfonate adsorbs at the surface of the particles, and intensity and the hardness of particle surface change.When adsorbing completely, the wearability of granule is minimum, and case hardness is also minimum, makes grinding be more easy to and carries out, and substantially increases fineness.Simultaneously grinding aid is also prevented from granule and is attached to and reduces crush force on medium or grinding machine, thus accelerating the grinding of material.What be directed to industrial residue is difficult to smash this problem, after adding sodium lignin sulfonate, improves the fineness of grinding, further increases the effect of additive.
Additive prepared by the present invention is liquid additive, is easy to spray uniformly when mixing with fire coal, easy to use.The addition of additive is little, effective；Coal adaptability is good, it is easy to popularization and application.
Therefore, the present invention have with low cost, economize on resources and eco-friendly feature, prepared additive for fire coal is easy to use, combustion efficiency good and application easy to spread, it is adaptable to cement industry kiln.
Detailed description of the invention
In order to be better understood by the present invention, below in conjunction with detailed description of the invention, the present invention is described in detail.
For avoiding repeating, first by as follows to the catalyst involved by this detailed description of the invention and oxidant Unify legislation, embodiment repeats no more:
In described catalyst: slag is 25 ~ 35wt%；Steel desulfurization slag is 10 ~ 20wt%；Cold rolling oxidation scum is 20 ~ 30wt%；Chromium slag is 5 ~ 15wt%；Manganese mine tailing is 5 ~ 15wt%；Manganese dioxide is 5 ~ 10wt%.
In described oxidant: potassium permanganate is 45 ~ 55wt%；Potassium hyperchlorate is 45 ~ 55wt%.
Embodiment 1
A kind of additive for fire coal and preparation method thereof.Raw material and the content thereof of additive for fire coal is: catalyst is 50 ~ 55wt%, and oxidant is 27 ~ 32wt%, and sodium chloride is 10 ~ 15wt%, and metasilicate pentahydrate sodium is 2 ~ 6wt%, and sodium lignin sulfonate is 0.05 ~ 0.15wt%.
By the raw material of described additive for fire coal and content thereof: be first that sodium lignin sulfonate is dissolved in the water by 1 (2 ~ 4) by solid-liquid mass ratio, prepare grinding aid solution；Prepared grinding aid solution is sprayed at equably catalyst surface, then the catalyst after grinding aid solution will be sprayed in grinding in ball grinder to particle diameter less than 100 μm, the fine powder after being ground；Then the fine powder after grinding is mixed with oxidant, sodium chloride, metasilicate pentahydrate sodium and the water for raw materials quality 2 ~ 4 times, high-speed stirred on shear mixer, obtain additive for fire coal.
By the additive for fire coal prepared by the present embodiment, join in certain in ash per bituminous coal with the addition of coal quantity 0.2%, rotary drum mixes 30 minutes (20r/min).Test result indicate that in sedimentation furnace and thermogravimetric: the ignition temperature of coal sample reduces 9.3 ~ 16.5 DEG C；After-flame degree improves 3.3 ~ 6.5%；Discharged nitrous oxides decreases 6.8 ~ 15.3%.
Embodiment 2
A kind of additive for fire coal and preparation method thereof.Raw material and the content thereof of additive for fire coal is: catalyst is 46 ~ 52wt%, and oxidant is 25 ~ 30wt%, and sodium chloride is 15 ~ 20wt%, and metasilicate pentahydrate sodium is 2 ~ 6wt%, and sodium lignin sulfonate is 0.05 ~ 0.15wt%.
By the raw material of described additive for fire coal and content thereof: be first that sodium lignin sulfonate is dissolved in the water by 1 (2 ~ 4) by solid-liquid mass ratio, prepare grinding aid solution；Prepared grinding aid solution is sprayed at equably catalyst surface, then the catalyst after grinding aid solution will be sprayed in grinding in ball grinder to particle diameter less than 100 μm, the fine powder after being ground；Then the fine powder after grinding is mixed with oxidant, sodium chloride, metasilicate pentahydrate sodium and the water for raw materials quality 2 ~ 4 times, high-speed stirred on shear mixer, obtain additive for fire coal.
By the additive for fire coal prepared by the present embodiment, join in certain high ash meta bituminous coal with the addition of coal quantity 0.2%, rotary drum mixes 30 minutes (20r/min).Test result indicate that in sedimentation furnace and thermogravimetric: the ignition temperature of coal sample reduces 9.1 ~ 14.8 DEG C；After-flame degree improves 3.1 ~ 5.7%；Discharged nitrous oxides decreases 12.5 ~ 18.6%.
Embodiment 3
A kind of additive for fire coal and preparation method thereof.Raw material and the content thereof of additive for fire coal is: catalyst is 40 ~ 46wt%, and oxidant is 32 ~ 35wt%, and sodium chloride is 16 ~ 20wt%, and metasilicate pentahydrate sodium is 2 ~ 6wt%, and sodium lignin sulfonate is 0.05 ~ 0.15wt%.
By the raw material of described additive for fire coal and content thereof: be first that sodium lignin sulfonate is dissolved in the water by 1 (2 ~ 4) by solid-liquid mass ratio, prepare grinding aid solution；Prepared grinding aid solution is sprayed at equably catalyst surface, then the catalyst after grinding aid solution will be sprayed in grinding in ball grinder to particle diameter less than 100 μm, the fine powder after being ground；Then the fine powder after grinding is mixed with oxidant, sodium chloride, metasilicate pentahydrate sodium and the water for raw materials quality 2 ~ 4 times, high-speed stirred on shear mixer, obtain additive for fire coal.
By the additive for fire coal prepared by the present embodiment, join in certain higher ash ortho bituminous coal with the addition of coal quantity 0.2%, rotary drum mixes 30 minutes (20r/min).Test result indicate that in sedimentation furnace and thermogravimetric: the ignition temperature of coal sample reduces 7.2 ~ 9.3 DEG C；After-flame degree improves 2.3 ~ 4.2%；Discharged nitrous oxides decreases 15.9 ~ 22.8%.
This detailed description of the invention compared with prior art has the positive effect that:
This detailed description of the invention utilizes industrial residue to make catalyst, turns waste into wealth, and greatly reduces cost of material, economizes on resources, environmental friendliness.Slag in this detailed description of the invention, steel desulfurization slag, cold rolling oxidation scum, chromium slag and manganese mine tailing contain substantial amounts of alkali metal and transition metal oxide, the addition of these oxides, poor in the two opposite polarity ionization potential of alternate formation, thus reducing original electromotive force, reducing the activation energy that burning is required, making the ignition temperature of reaction reduce, burning is more easy to and carries out, thus accelerating coal combustion speed, promoting the burning completely of coal dust, improve efficiency of combustion.Metal-oxide can change the physical aspect of coal dust or coke surface simultaneously, and then strengthens coal dust or coke to NOXAbsorption, promote coke heterogeneous reduction reaction；Coal dust or coke metal oxide-loaded after, it is possible to reducing the activation energy of the heterogeneous reduction reaction of coke, and then making out-phase reaction rate improve, thus playing catalytic denitration effect.So after adding catalyst, ignition temperature reduces 7.2 ~ 16.5 DEG C, and after-flame degree improves 2.3 ~ 6.5%, and discharged nitrous oxides decreases 6.8 ~ 22.8%.
Potassium permanganate and potassium hyperchlorate in this detailed description of the invention can progressively decompose the active oxygen of precipitation at different temperature sections, not only increase the contact area of fixed carbon and oxygen, promote the burning completely of fixed carbon, and the carbon granules of the fuel gas in after-flame flue gas and suspension is played very big effect, thus reduce the consumption of coal and the blackness of flue gas；The manganese dioxide generated after potassium permanganate burning is again the catalyst of oxidation reaction, can promote again the carrying out of oxidation reaction.Potassium hyperchlorate finally decomposes the potassium chloride of generation can also play the effect that catalysis is burnt.
Sodium chloride in this detailed description of the invention at high temperature can instantaneous expansion, make fire coal be in fluffy state, increasing specific surface area, increase oxygen supply face, make burning more abundant.Meanwhile, when temperature reaches 800 DEG C, sodium chloride can resolve into SODIUM METAL and chlorine, sodium and chlorine and all have catalytic combustion-supporting effect.
What the metasilicate pentahydrate sodium in this detailed description of the invention played is peptizaiton.After adding metasilicate pentahydrate sodium, in additive, other auxiliary agents can better be dispersed in water, and mixing evenly, improves the utilization ratio of additive.
Sodium lignin sulfonate in this detailed description of the invention is typical lignin sulfonate, has good grind-aiding effect.Sodium lignin sulfonate adsorbs at the surface of the particles, and intensity and the hardness of particle surface change.When adsorbing completely, the wearability of granule is minimum, and case hardness is also minimum, makes grinding be more easy to and carries out, and substantially increases fineness.Simultaneously grinding aid is also prevented from granule and is attached to and reduces crush force on medium or grinding machine, thus accelerating the grinding of material.What be directed to industrial residue is difficult to smash this problem, after adding sodium lignin sulfonate, improves the fineness of grinding, further increases the effect of additive.
Additive prepared by this detailed description of the invention is liquid additive, is easy to spray uniformly when mixing with fire coal, easy to use.The addition of additive is little, effective；Coal adaptability is good, it is easy to popularization and application.
Therefore, this detailed description of the invention have with low cost, economize on resources and eco-friendly feature, prepared additive for fire coal is easy to use, combustion efficiency good and application easy to spread, it is adaptable to cement industry kiln.
Claims (2)
1. the preparation method of an additive for fire coal, it is characterized in that the raw material of described additive for fire coal and content thereof are: catalyst is 40 ~ 55wt%, oxidant is 25 ~ 35wt%, and sodium chloride is 10 ~ 20wt%, metasilicate pentahydrate sodium is 2 ~ 6wt%, and sodium lignin sulfonate is 0.05 ~ 0.15wt%；
By the raw material of described additive for fire coal and content thereof: be first that sodium lignin sulfonate is dissolved in the water by 1 (2 ~ 4) by solid-liquid mass ratio, prepare grinding aid solution；Prepared grinding aid solution is sprayed at equably catalyst surface, then the catalyst after grinding aid solution will be sprayed in grinding in ball grinder to particle diameter less than 100 μm, the fine powder after being ground；Then the fine powder after grinding is mixed with oxidant, sodium chloride, metasilicate pentahydrate sodium and the water for raw materials quality 2 ~ 4 times, high-speed stirred on shear mixer, obtain additive for fire coal；
In described catalyst: slag is 25 ~ 35wt%, steel desulfurization slag is 10 ~ 20wt%, and cold rolling oxidation scum is 20 ~ 30wt%, and chromium slag is 5 ~ 15wt%, and manganese mine tailing is 5 ~ 15wt%, and manganese dioxide is 5 ~ 10wt%；
In described oxidant: potassium permanganate is 45 ~ 55wt%, potassium hyperchlorate is 45 ~ 55wt%.
2. an additive for fire coal, it is characterised in that described additive for fire coal is additive for fire coal prepared by the preparation method of additive for fire coal according to claim 1.
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| CN110982578B (en) * | 2019-11-22 | 2021-08-10 | 南京钢铁股份有限公司 | Blast furnace blowing semi-coke additive and preparation and use method thereof |
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