CN104232241A - Burning coal additive and preparation method thereof - Google Patents
Burning coal additive and preparation method thereof Download PDFInfo
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- CN104232241A CN104232241A CN201410536296.9A CN201410536296A CN104232241A CN 104232241 A CN104232241 A CN 104232241A CN 201410536296 A CN201410536296 A CN 201410536296A CN 104232241 A CN104232241 A CN 104232241A
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Abstract
The invention relates to a burning coal additive and a preparation method thereof. The technical scheme is that the burning coal additive is composed of raw materials, by weight, of 40%-55% of catalyst, 25%-35% of oxidant, 10%-20% of sodium chloride, 2%-6% of sodium metasilicate pentahydrate and 0.05%-0.15% of lignin sulfonate. The method includes the steps of dissolving lignin sulfonate in water to obtain a grinding aid solution according to a solid-liquid mass ratio of 1:(2-4); uniformly spraying the grinding aid solution onto the surface of the catalyst and grinding the obtained product in a ball mill to be smaller than 100 mu m in particle size to obtained ground fine powder; mixing the ground fine powder with the oxidant, sodium chloride, sodium metasilicate pentahydrate and water in the quality 2-4 times of the raw materials and stirring at high speed in a shear mixer to obtain the coal additive. The burning coal additive and the preparation method thereof has the advantages of low costs, resource saving and environment friendliness. The prepared burning coal additive is easy to use and popularize, good in burning effect and applicable to a cement industrial furnace.
Description
Technical field
The invention belongs to coal combustion technology field.Be 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 applicable to China's national situation, improving coal utilization efficiency, reduce the discharge of the obnoxious flavour such as sulfurous gas, oxynitride and flue dust, realizing one of energy sustainable development strategy, the effective measure solving air environmental pollution by becoming country.Although China's coal-mine is of a great variety, aboundresources, but the coal scope that can adapt to new type nonaqueous cement industry is narrower, the many uses of large and medium-sized enterprise in China's Cement industry comparatively high-quality bituminous coal, to increase the calorific value of coal dust, prevents ring formation in the bonding of kiln tail system and kiln.But with regard to utilize resources synthetically and economic benefit, to utilizing low-volatile coal and ash coal, Cement industry carries obligation one can't decline again.
In recent years, cement kiln many employings low activity was 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 used for precalciner kiln, because it is flammable poor, combustionvelocity is slow, and kindling temperature is high, and it is insufficient to burn, and these defects all can bring the factors of instability to manufacture of cement.In addition, Cement industry is coal-fired lavish consumer, and its NOx discharge has been only second to China's thermoelectricity and vehicle exhaust, and occupy the third-largest discharge family, Environmental Protection Situation is increasingly severe.
In order to make up above defect, a lot of technician develops different additives, but because these additives are expensive or poor effect, or the productive prospecting of Cement industry can not be adapted to, cause being difficult to be widely applied.
Summary of the invention
The present invention is intended to overcome prior art defect, object be 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 efficacy good and be easy to apply.
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 are: catalyzer is 40 ~ 55wt%, and oxygenant is 25 ~ 35wt%, and sodium-chlor is 10 ~ 20wt%, metasilicate pentahydrate sodium is 2 ~ 6wt%, and sodium lignosulfonate is 0.05 ~ 0.15wt%.
Raw material and content thereof by described additive for fire coal: be first that sodium lignosulfonate is dissolved in the water by 1 ︰ (2 ~ 4) by solid-liquid mass ratio, obtained grinding aid solution; Obtained grinding aid dissolution homogeneity is sprayed at catalyst surface, then the catalyzer after spraying grinding aid solution is less than 100 μm at grinding in ball grinder to particle diameter, obtain the fine powder after grinding; Then mixed with oxygenant, sodium-chlor, metasilicate pentahydrate sodium and the water for raw materials quality 2 ~ 4 times by the fine powder after grinding, high-speed stirring on shear mixer, obtains additive for fire coal.
In described catalyzer: 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%; Manganse Dioxide is 5 ~ 10wt%.
In described oxygenant: potassium permanganate is 45 ~ 55wt%; Potassium perchlorate is 45 ~ 55wt%.
Owing to adopting technique scheme, the present invention compared with prior art has following positively effect:
The present invention utilizes industrial residue to make catalyzer, turns waste into wealth, and greatly reduces raw materials cost, economizes on resources, environmental friendliness.Slag in the present invention, steel desulfurization slag, cold rolling oxidation scum, chromium slag and manganese mine tailing contain a large amount of basic metal and transition metal oxide, adding of these oxide compounds, poor in the opposite polarity ionization potential of two alternate formation, thus reduce original electromotive force, reduce the activation energy needed for burning, the kindling temperature of reaction is reduced, burning is more easily carried out, thus accelerate coal combustion speed, promote the perfect combustion of coal dust, improve efficiency of combustion.Simultaneously metal oxide can change the physical aspect of coal dust or coke surface, and then strengthens coal dust or coke to NO
xabsorption, promote coke heterogeneous reduction reaction; Coal dust or coke metal oxide-loaded after, the activation energy of the heterogeneous reduction reaction of coke can be reduced, and then out-phase speed of reaction is improved, thus play catalytic denitration effect.So after adding catalyzer, kindling 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 in the present invention and potassium perchlorate progressively can divide at different temperature sections and parse active oxygen, not only increase the contact area of fixed carbon and oxygen, facilitate the perfect combustion of fixed carbon, and very large effect is played to the carbon granules of the inflammable gas in after-flame flue gas and suspension, thus reduce the consumption of coal and the blackness of flue gas; The Manganse Dioxide generated after potassium permanganate burning is again the catalyzer of oxidizing reaction, again can the carrying out of accelerating oxidation reaction.The Repone K that potassium perchlorate finally decomposes generation also can play the effect of catalyticcombustion.
Sodium-chlor in the present invention at high temperature can instantaneous expansion, makes fire coal be in fluffy state, increasing specific surface area, increases oxygen supply face, make burning more abundant.Meanwhile, when temperature reaches 800 DEG C, sodium-chlor can resolve into SODIUM METAL and chlorine, and sodium and chlorine all have catalytic combustion-supporting effect.
What the metasilicate pentahydrate sodium in the present invention played is dissemination.After adding metasilicate pentahydrate sodium, in additive, other auxiliary agents can better be dispersed in water, mixing evenly, improve the utilising efficiency of additive.
Sodium lignosulfonate in the present invention is typical lignin sulfonate, has good grind-aiding effect.At the surface of the particles, intensity and the hardness of particle surface change in sodium lignosulfonate absorption.When adsorbing completely, the wear resistance of particle is minimum, and surface hardness is also minimum, grinding is more easily carried out, and substantially increases fineness.Grinding aid can also prevent particle be attached on medium or grinding machine and reduce crush force simultaneously, thus accelerates the grinding of material.Be directed to industrial residue be difficult to shatter this problem, after adding sodium lignosulfonate, improve the fineness of grinding, further increase the effect of additive.
Additive prepared by the present invention is fluid additive, is convenient to spray evenly when mixing with fire coal, easy to use.The addition of additive is little, effective; Coal adaptability is good, is easy to apply.
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 efficacy good and be easy to apply, and is applicable to Cement industry kiln.
Embodiment
In order to better understand the present invention, below in conjunction with embodiment, the present invention is described in detail.
For avoiding repetition, first by the catalyzer involved by this embodiment and oxygenant Unify legislation as follows, repeat no more in embodiment:
In described catalyzer: 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%; Manganse Dioxide is 5 ~ 10wt%.
In described oxygenant: potassium permanganate is 45 ~ 55wt%; Potassium perchlorate 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 are: catalyzer is 50 ~ 55wt%, and oxygenant is 27 ~ 32wt%, and sodium-chlor is 10 ~ 15wt%, and metasilicate pentahydrate sodium is 2 ~ 6wt%, and sodium lignosulfonate is 0.05 ~ 0.15wt%.
Raw material and content thereof by described additive for fire coal: be first that sodium lignosulfonate is dissolved in the water by 1 ︰ (2 ~ 4) by solid-liquid mass ratio, obtained grinding aid solution; Obtained grinding aid dissolution homogeneity is sprayed at catalyst surface, then the catalyzer after spraying grinding aid solution is less than 100 μm at grinding in ball grinder to particle diameter, obtain the fine powder after grinding; Then mixed with oxygenant, sodium-chlor, metasilicate pentahydrate sodium and the water for raw materials quality 2 ~ 4 times by the fine powder after grinding, high-speed stirring on shear mixer, obtains additive for fire coal.
By the additive for fire coal prepared by the present embodiment, join in certain in ash content per-bituminous coal with the add-on of coal quantity 0.2%, in rotary drum, mix 30 minutes (20r/min).Experimental result in sedimentation furnace and thermogravimetric shows: the kindling 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 are: catalyzer is 46 ~ 52wt%, and oxygenant is 25 ~ 30wt%, and sodium-chlor is 15 ~ 20wt%, and metasilicate pentahydrate sodium is 2 ~ 6wt%, and sodium lignosulfonate is 0.05 ~ 0.15wt%.
Raw material and content thereof by described additive for fire coal: be first that sodium lignosulfonate is dissolved in the water by 1 ︰ (2 ~ 4) by solid-liquid mass ratio, obtained grinding aid solution; Obtained grinding aid dissolution homogeneity is sprayed at catalyst surface, then the catalyzer after spraying grinding aid solution is less than 100 μm at grinding in ball grinder to particle diameter, obtain the fine powder after grinding; Then mixed with oxygenant, sodium-chlor, metasilicate pentahydrate sodium and the water for raw materials quality 2 ~ 4 times by the fine powder after grinding, high-speed stirring on shear mixer, obtains additive for fire coal.
By the additive for fire coal prepared by the present embodiment, join in certain high ash content meta-bituminous coal with the add-on of coal quantity 0.2%, in rotary drum, mix 30 minutes (20r/min).Experimental result in sedimentation furnace and thermogravimetric shows: the kindling 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 are: catalyzer is 40 ~ 46wt%, and oxygenant is 32 ~ 35wt%, and sodium-chlor is 16 ~ 20wt%, and metasilicate pentahydrate sodium is 2 ~ 6wt%, and sodium lignosulfonate is 0.05 ~ 0.15wt%.
Raw material and content thereof by described additive for fire coal: be first that sodium lignosulfonate is dissolved in the water by 1 ︰ (2 ~ 4) by solid-liquid mass ratio, obtained grinding aid solution; Obtained grinding aid dissolution homogeneity is sprayed at catalyst surface, then the catalyzer after spraying grinding aid solution is less than 100 μm at grinding in ball grinder to particle diameter, obtain the fine powder after grinding; Then mixed with oxygenant, sodium-chlor, metasilicate pentahydrate sodium and the water for raw materials quality 2 ~ 4 times by the fine powder after grinding, high-speed stirring on shear mixer, obtains additive for fire coal.
By the additive for fire coal prepared by the present embodiment, join in certain higher ash content ortho-bituminous coal with the add-on of coal quantity 0.2%, in rotary drum, mix 30 minutes (20r/min).Experimental result in sedimentation furnace and thermogravimetric shows: the kindling 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 embodiment compared with prior art has following positively effect:
This embodiment utilizes industrial residue to make catalyzer, turns waste into wealth, and greatly reduces raw materials cost, economizes on resources, environmental friendliness.Slag in this embodiment, steel desulfurization slag, cold rolling oxidation scum, chromium slag and manganese mine tailing contain a large amount of basic metal and transition metal oxide, adding of these oxide compounds, poor in the opposite polarity ionization potential of two alternate formation, thus reduce original electromotive force, reduce the activation energy needed for burning, the kindling temperature of reaction is reduced, burning is more easily carried out, thus accelerate coal combustion speed, promote the perfect combustion of coal dust, improve efficiency of combustion.Simultaneously metal oxide can change the physical aspect of coal dust or coke surface, and then strengthens coal dust or coke to NO
xabsorption, promote coke heterogeneous reduction reaction; Coal dust or coke metal oxide-loaded after, the activation energy of the heterogeneous reduction reaction of coke can be reduced, and then out-phase speed of reaction is improved, thus play catalytic denitration effect.So after adding catalyzer, kindling 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 in this embodiment and potassium perchlorate progressively can divide at different temperature sections and parse active oxygen, not only increase the contact area of fixed carbon and oxygen, facilitate the perfect combustion of fixed carbon, and very large effect is played to the carbon granules of the inflammable gas in after-flame flue gas and suspension, thus reduce the consumption of coal and the blackness of flue gas; The Manganse Dioxide generated after potassium permanganate burning is again the catalyzer of oxidizing reaction, again can the carrying out of accelerating oxidation reaction.The Repone K that potassium perchlorate finally decomposes generation also can play the effect of catalyticcombustion.
Sodium-chlor in this embodiment at high temperature can instantaneous expansion, makes fire coal be in fluffy state, increasing specific surface area, increases oxygen supply face, make burning more abundant.Meanwhile, when temperature reaches 800 DEG C, sodium-chlor can resolve into SODIUM METAL and chlorine, and sodium and chlorine all have catalytic combustion-supporting effect.
What the metasilicate pentahydrate sodium in this embodiment played is dissemination.After adding metasilicate pentahydrate sodium, in additive, other auxiliary agents can better be dispersed in water, mixing evenly, improve the utilising efficiency of additive.
Sodium lignosulfonate in this embodiment is typical lignin sulfonate, has good grind-aiding effect.At the surface of the particles, intensity and the hardness of particle surface change in sodium lignosulfonate absorption.When adsorbing completely, the wear resistance of particle is minimum, and surface hardness is also minimum, grinding is more easily carried out, and substantially increases fineness.Grinding aid can also prevent particle be attached on medium or grinding machine and reduce crush force simultaneously, thus accelerates the grinding of material.Be directed to industrial residue be difficult to shatter this problem, after adding sodium lignosulfonate, improve the fineness of grinding, further increase the effect of additive.
Additive prepared by this embodiment is fluid additive, is convenient to spray evenly when mixing with fire coal, easy to use.The addition of additive is little, effective; Coal adaptability is good, is easy to apply.
Therefore, this embodiment have with low cost, economize on resources and eco-friendly feature, prepared additive for fire coal is easy to use, combustion efficacy good and be easy to apply, and is applicable to Cement industry kiln.
Claims (2)
1. the preparation method of an additive for fire coal, it is characterized in that raw material and the content thereof of described additive for fire coal are: catalyzer is 40 ~ 55wt%, and oxygenant is 25 ~ 35wt%, and sodium-chlor is 10 ~ 20wt%, metasilicate pentahydrate sodium is 2 ~ 6wt%, and sodium lignosulfonate is 0.05 ~ 0.15wt%;
Raw material and content thereof by described additive for fire coal: be first that sodium lignosulfonate is dissolved in the water by 1 ︰ (2 ~ 4) by solid-liquid mass ratio, obtained grinding aid solution; Obtained grinding aid dissolution homogeneity is sprayed at catalyst surface, then the catalyzer after spraying grinding aid solution is less than 100 μm at grinding in ball grinder to particle diameter, obtain the fine powder after grinding; Then mixed with oxygenant, sodium-chlor, metasilicate pentahydrate sodium and the water for raw materials quality 2 ~ 4 times by the fine powder after grinding, high-speed stirring on shear mixer, obtains additive for fire coal;
In described catalyzer: 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 Manganse Dioxide is 5 ~ 10wt%;
In described oxygenant: potassium permanganate is 45 ~ 55wt%, potassium perchlorate is 45 ~ 55wt%.
2. an additive for fire coal, is characterized 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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Cited By (2)
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| CN107177387A (en) * | 2017-05-16 | 2017-09-19 | 南京荣丰环保科技有限公司 | A kind of liquid multifunctional efficient coal-fired sulfur fixing agent and preparation method thereof |
| CN110982578A (en) * | 2019-11-22 | 2020-04-10 | 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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| 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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