CN104479792A - Preparation method for desulfurizing agent for boiler coal combustion - Google Patents
Preparation method for desulfurizing agent for boiler coal combustion Download PDFInfo
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Abstract
The invention discloses a preparation method for a desulfurizing agent for boiler coal combustion, and belongs to the technical field of desulfurizing agents. The preparation method comprises the following steps: adding aluminum nitrate nonahydrate in water, heating, dropping a sodium hydroxide solution, holding the temperature after completing dropping, and adding calcium oxide to obtain a sol mixture; drying the sol mixture, and sintering the dried mixture in a muffle furnace to obtain calcium-oxide-doped aluminum oxide; uniformly mixing and crushing the calcium-oxide-doped aluminum oxide, silicon dioxide, ferric oxide, sodium nitrate, zinc hydroxide, calcium fluoride, ferric trichloride, magnesium oxide, iron powder and aluminum powder to obtain the desulfurizing agent for the boiler coal combustion. According to the preparation method for the desulfurizing agent for the boiler coal combustion, the desulfurizing agent is prepared by utilizing the aluminium oxide as a carrier, so that the coal combustion procedure can be greatly desulfurized, and the temperature of a furnace box can be remarkably improved.
Description
Technical field
The present invention discloses a kind of preparation method of sweetening agent of bunker coal, belongs to sweetening agent technical field.
Background technology
Due to the restriction of China's Energy resources feature and the level of economic development. determine energy structure based on coal in China by long-term existence.Use the result of the fossil oils such as coal in a large number, make the topsoil of China very serious.The continuous increase of sulphur dioxide emission, has very large harm by all many-sides such as HUMAN HEALTH, crop growth and volume increase, the Quality advance of Industrial products and the protections of building and historical relic. cause larger financial loss.In order to control of acid rain pollutes, further genralrlization is particularly important with development flue gas desulfurization technique.Desulfurization technology and method can divide three major types substantially. i.e. stokehole desulfuration, desulfuration in furnace and flue gas desulfurization.
Wherein, in burning, desulfurization has generally comprised: 1, flue gas circulating fluidized bed desulfurization technology, flue gas circulating fluidized bed desulfurization technology is the desulfurization technology of new generation grown up the eighties in last century, due to the temperature of combustion in fluidized-bed lower (850 ~ 900 DEG C), so directly limestone desulfurizer can be added in bed, complete effective desulfurization in combustion.Compare with traditional desulfurization technology. SO in sweetening agent and flue gas in fluidized-bed
2between reaction environment (temperature of reaction, the residence time and mass transfer etc.) be extremely conducive to the carrying out of desulphurization reaction.Circulating fluidized bed is in current power industry, one of the first-selected type of furnace of low capacity electricity generation boiler.2, AG-R type desulfurization technology, containing organosulfur and inorganic sulfur two class in coal, but in the high-temp combustion of coal-powder boiler, inorganic sulfur can be decomposed into SO
2.Coal is in Thorough combustion process, and all flammable sulphur all can discharge, and oxidation generates SO
2enter air.AG-2 type sweetening agent key adds a certain amount of catalyzer, changes the physics and chemistry characteristic of traditional sweetening agent, substantially increases sweetening agent and absorb SO
2ability.Sweetening agent be stored in be placed in zero meter, boiler sweetening agent warehouse in. sweetening agent sent in the stokehold small feed bin near boiler by spraying point by air. sweetening agent is supplied to pressurized air by feeding machine equably, sweetening agent sprays in burner hearth by nozzle, fully mix with flue gas, decompose, catalysis, and with S02 effect, generate vitriol, reach the object of desulfurization.AG-R type desulphurization system has the advantages such as investment is low, and floor space is little, and running cost is few, and flexible to operation and controllability is strong.
CN101961594A discloses a kind of sweetening agent, be made up of subcarbonate, silicon-dioxide and auxiliary agent, in sweetening agent total weight percent, basic carbonate salts contg is 50 ~ 97%, dioxide-containing silica is 2.5 ~ 20%, auxiliary agent content is 0.1 ~ 30%, and wherein said subcarbonate is at least one in ventilation breather and zinc subcarbonate, and described auxiliary agent is at least one in aluminum oxide and attapulgite.
CN 102787000A discloses a kind of fire coal boiler fume dry-desulphurizer with calorific value, it is after being pulverized by biological material, be 1:(0.16 ~ 0.36 according to carbide slag and biological material mass ratio) ratio blending, granulating working procedure, what prepare is exclusively used in stove the particulate solid mixed and burn desulfurization; This sweetening agent density is 1.1 ~ 1.4g/cm
3, particle diameter is 6 ~ 10mm; Described biological material is straw class, crops leftovers, leaf or weeds.
But when above-mentioned sweetening agent is in the process being applied to boiler desulfurization, still can there is boiler coke serious, the problem that fire box temperature is not high.
Summary of the invention
Technical problem to be solved by this invention is: conventional sweetening agent is when being applied to bunker coal additive, and bad desulfurization effects, fire box temperature are not high.
Technical scheme:
A preparation method for the sweetening agent of bunker coal, comprises the steps:
1st step, by weight, ANN aluminium nitrate nonahydrate 20 ~ 30 parts to be added in 300 ~ 400 parts of water, after being warming up to 90 ~ 100 DEG C, dripping sodium hydroxide solution, dropwise rear insulation, then add 20 ~ 30 parts, calcium oxide, obtain collosol intermixture;
2nd step, collosol intermixture to be dried, then to sinter in retort furnace, obtain the aluminum oxide of calcium oxide doping;
3rd step, the aluminum oxide adulterated by calcium oxide, silicon-dioxide 3 ~ 5 parts, ferric oxide 2 ~ 4 parts, SODIUMNITRATE 10 ~ 15 parts, zinc hydroxide 3 ~ 5 parts, 2 ~ 4 parts, Calcium Fluoride (Fluorspan), iron trichloride 4 ~ 6 parts, 3 ~ 5 parts, magnesium oxide, iron powder 2 ~ 4 parts, aluminium powder 2 ~ 4 parts mix, and pulverize.
In the 1st described step, the concentration of sodium hydroxide solution is 1wt%.
In the 1st described step, soaking time is insulation 2 ~ 4 hours.
In the 2nd described step, bake out temperature 110 ~ 120 DEG C.
In the 2nd described step, sintering temperature 700 ~ 900 DEG C.
In the 2nd described step, sintering time 3 ~ 6 hours.
In the 3rd described step, the granularity of pulverizing is 200 ~ 400 orders.
beneficial effect
The present invention, by being carrier with aluminum oxide, having obtained to the utmost sweetening agent, can carry out the effect of desulfurization preferably, and can improve fire box temperature significantly to coal-fired process.
Embodiment
embodiment 1
1st step, ANN aluminium nitrate nonahydrate 20Kg to be added in 300Kg water, after being warming up to 90 DEG C, dripping the sodium hydroxide solution of 1wt%, dropwise rear insulation 2 hours, then add calcium oxide 20Kg, obtain collosol intermixture;
2nd step, to dry under collosol intermixture 110 DEG C of conditions, then carry out sintering 3 hours with the temperature of 700 DEG C in retort furnace, obtain the aluminum oxide of calcium oxide doping;
3rd step, the aluminum oxide adulterated by calcium oxide, silicon-dioxide 3Kg, ferric oxide 2Kg, SODIUMNITRATE 10Kg, zinc hydroxide 3Kg, Calcium Fluoride (Fluorspan) 2Kg, iron trichloride 4Kg, magnesium oxide 3Kg, iron powder 2Kg, aluminium powder 2Kg mix, and be crushed to 200 ~ 400 object granularities.
embodiment 2
1st step, ANN aluminium nitrate nonahydrate 30Kg to be added in 400Kg water, after being warming up to 100 DEG C, dripping the sodium hydroxide solution of 1wt%, dropwise rear insulation 4 hours, then add calcium oxide 30Kg, obtain collosol intermixture;
2nd step, to dry under collosol intermixture 120 DEG C of conditions, then carry out sintering 6 hours with the temperature of 900 DEG C in retort furnace, obtain the aluminum oxide of calcium oxide doping;
3rd step, the aluminum oxide adulterated by calcium oxide, silicon-dioxide 5Kg, ferric oxide 4Kg, SODIUMNITRATE 15Kg, zinc hydroxide 5Kg, Calcium Fluoride (Fluorspan) 4Kg, iron trichloride 6Kg, magnesium oxide 5Kg, iron powder 4Kg, aluminium powder 4Kg mix, and be crushed to 200 ~ 400 object granularities.
embodiment 3
1st step, ANN aluminium nitrate nonahydrate 25Kg to be added in 350Kg water, after being warming up to 95 DEG C, dripping the sodium hydroxide solution of 1wt%, dropwise rear insulation 3 hours, then add calcium oxide 25Kg, obtain collosol intermixture;
2nd step, to dry under collosol intermixture 115 DEG C of conditions, then carry out sintering 5 hours with the temperature of 800 DEG C in retort furnace, obtain the aluminum oxide of calcium oxide doping;
3rd step, the aluminum oxide adulterated by calcium oxide, silicon-dioxide 4Kg, ferric oxide 3Kg, SODIUMNITRATE 12Kg, zinc hydroxide 4Kg, Calcium Fluoride (Fluorspan) 3Kg, iron trichloride 5Kg, magnesium oxide 4Kg, iron powder 3Kg, aluminium powder 3Kg mix, and be crushed to 200 ~ 400 object granularities.
reference examples 1
Be with the difference of embodiment 3: calcium oxide adds in the 3rd step.
1st step, ANN aluminium nitrate nonahydrate 25Kg to be added in 350Kg water, after being warming up to 95 DEG C, dripping the sodium hydroxide solution of 1wt%, dropwise rear insulation 3 hours, obtain colloidal sol;
2nd step, to dry under colloidal sol 115 DEG C of conditions, then carry out sintering 5 hours with the temperature of 800 DEG C in retort furnace, obtain aluminum oxide;
3rd step, the aluminum oxide the 2nd step obtained, calcium oxide 25Kg, silicon-dioxide 4Kg, ferric oxide 3Kg, SODIUMNITRATE 12Kg, zinc hydroxide 4Kg, Calcium Fluoride (Fluorspan) 3Kg, iron trichloride 5Kg, magnesium oxide 4Kg, iron powder 3Kg, aluminium powder 3Kg mix, and be crushed to 200 ~ 400 object granularities.
reference examples 2
Be with the difference of embodiment 3: do not add Calcium Fluoride (Fluorspan).
1st step, ANN aluminium nitrate nonahydrate 25Kg to be added in 350Kg water, after being warming up to 95 DEG C, dripping the sodium hydroxide solution of 1wt%, dropwise rear insulation 3 hours, then add calcium oxide 25Kg, obtain collosol intermixture;
2nd step, to dry under collosol intermixture 115 DEG C of conditions, then carry out sintering 5 hours with the temperature of 800 DEG C in retort furnace, obtain the aluminum oxide of calcium oxide doping;
3rd step, the aluminum oxide adulterated by calcium oxide, silicon-dioxide 4Kg, ferric oxide 3Kg, SODIUMNITRATE 12Kg, zinc hydroxide 4Kg, iron trichloride 5Kg, magnesium oxide 4Kg, iron powder 3Kg, aluminium powder 3Kg mix, and are crushed to 200 ~ 400 object granularities.
performance test
Sweetening agent boiler of power plant using above-described embodiment and reference examples prepare adds fire coal, and addition adds 3 kilograms of sweetening agents in fire coal per ton.
| Sulphur concentration mg/m in flue gas 3 | Furnace temperature DEG C | |
| Do not add | 6714 | 720 |
| Embodiment 1 | 3345 | 790 |
| Embodiment 2 | 3330 | 790 |
| Embodiment 3 | 3035 | 820 |
| Reference examples 1 | 4125 | 740 |
| Reference examples 2 | 4260 | 750 |
As can be seen from the table, sweetening agent provided by the invention has good desulfurization and improves the effect of furnace temperature.Particularly, calcium oxide, relative to reference examples 1, is introduced by embodiment in the process preparing aluminum hydroxide sol, then by sintering, it is immobilized on alumina supporter, can improve the effect of its desulfurization further.In addition, by introducing Calcium Fluoride (Fluorspan) in embodiment, sweetening effectiveness can be improved and improve fire box temperature.
Claims (7)
1. a preparation method for the sweetening agent of bunker coal, is characterized in that, comprises the steps:
1st step, by weight, ANN aluminium nitrate nonahydrate 20 ~ 30 parts to be added in 300 ~ 400 parts of water, after being warming up to 90 ~ 100 DEG C, dripping sodium hydroxide solution, dropwise rear insulation, then add 20 ~ 30 parts, calcium oxide, obtain collosol intermixture;
2nd step, collosol intermixture to be dried, then to sinter in retort furnace, obtain the aluminum oxide of calcium oxide doping;
3rd step, the aluminum oxide adulterated by calcium oxide, silicon-dioxide 3 ~ 5 parts, ferric oxide 2 ~ 4 parts, SODIUMNITRATE 10 ~ 15 parts, zinc hydroxide 3 ~ 5 parts, 2 ~ 4 parts, Calcium Fluoride (Fluorspan), iron trichloride 4 ~ 6 parts, 3 ~ 5 parts, magnesium oxide, iron powder 2 ~ 4 parts, aluminium powder 2 ~ 4 parts mix, and pulverize.
2. the preparation method of the sweetening agent of bunker coal according to claim 1, is characterized in that: in the 1st described step, the concentration of sodium hydroxide solution is 1wt%.
3. the preparation method of the sweetening agent of bunker coal according to claim 1, is characterized in that: in the 1st described step, and soaking time is insulation 2 ~ 4 hours.
4. the preparation method of the sweetening agent of bunker coal according to claim 1, is characterized in that: in the 2nd described step, bake out temperature 110 ~ 120 DEG C.
5. the preparation method of the sweetening agent of bunker coal according to claim 1, is characterized in that: in the 2nd described step, sintering temperature 700 ~ 900 DEG C.
6. the preparation method of the sweetening agent of bunker coal according to claim 1, is characterized in that: in the 2nd described step, sintering time 3 ~ 6 hours.
7. the preparation method of the sweetening agent of bunker coal according to claim 1, is characterized in that: in the 3rd described step, and the granularity of pulverizing is 200 ~ 400 orders.
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Cited By (3)
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| CN105771636A (en) * | 2016-04-22 | 2016-07-20 | 杭州富阳高博信息技术服务有限公司 | Preparation method of smoke desulphurizing powder |
| CN105903323A (en) * | 2016-04-22 | 2016-08-31 | 杭州富阳高博信息技术服务有限公司 | Solid desulphurization pulvis and preparation technology thereof |
| CN109794145A (en) * | 2017-11-16 | 2019-05-24 | 柳州市皇盛环保科技有限公司 | A kind of fume desulfurizing agent |
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| CN108479373B (en) * | 2016-04-22 | 2021-03-05 | 辽宁基伊能源科技有限公司 | Preparation method of environment-friendly flue gas desulfurization powder |
| CN109794145A (en) * | 2017-11-16 | 2019-05-24 | 柳州市皇盛环保科技有限公司 | A kind of fume desulfurizing agent |
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