CN1093559C - Process for increasing smelting point of coal ash - Google Patents
Process for increasing smelting point of coal ash Download PDFInfo
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- CN1093559C CN1093559C CN 99118951 CN99118951A CN1093559C CN 1093559 C CN1093559 C CN 1093559C CN 99118951 CN99118951 CN 99118951 CN 99118951 A CN99118951 A CN 99118951A CN 1093559 C CN1093559 C CN 1093559C
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Abstract
The present invention relates to a method for enhancing the smelting point of coal ash, which is characterized in that two kinds of coal with different ash contents are mixed by that A, when the total weight of the mixed coal is 100%, S is not more than 1%, and the ash is from 5% to 15%; B, when the total weight of the ash is 100%, SiO2+Al2O3+CaO is not less than 70%; C, any condition in the following 1 to 4 is selected; 1, when the ash is 100%, SiO2+Al2O3 is not less than 70%; 2, when the SiO2+Al2O3+CaO is 100%, the SiO2 is not less than 65%; 3, when the SiO2+Al2O3+CaO is 100%, the Al2O3 is not less than 25%; 4, when the SiO2+Al2O3+CaO is 100%, the CaO is not less than 35%. The method enables two kinds of coal not applied to boiler to be converted into application, and has large industrial significance.
Description
The present invention relates to be used to improve the method for coal ash fusion temperature, relate in particular to a kind of two or more coals being mixed and improve the method for coal ash fusion temperature according to the composition in the various pit ash.
Those skilled in the art knows, and coal ash fusion temperature is that boiler oil is very strict to the ash fusion point requirement of fuel coal with an important indicator, particularly boiler of power plant of coal.This be because, the coal of low ash smelting point produces molten state when the stove internal combustion lime-ash adheres to the furnace wall, so not only influence the thermo-efficiency of boiler, even more serious is to cause hidden danger, and grey number of times is blown in the lighter's increase, increase labour intensity, cause the water wall tube be full of cracks, thereby cause the life-span of boiler to be reduced, even cause blowing out, weight person's tube wall bursts, and leads to Serious Accident.Therefore, in the requirement of power plant to fuel coal, coal ash fusion temperature is usually as first-selected index.Current, because environmental requirement, sulphur content in the bunker coal must be less than 1%, otherwise must set up the sweetener of involve great expense (being equivalent to boiler cost 2/3rds), not only increased investment, and strengthened labour intensity, particularly improvement project and spent investment to be greater than investment when newly-built.In the face of this situation, Power Plant Fuel is changing with texture of coal, just requires the content of sulphur in coal to be lower than 1% on the one hand, and the softening temperature that requires coal ash on the other hand is more than 1250 ℃ (± 50 ℃).For low sulphur coal, owing to be subjected to the influence of coal-forming environment, its coal ash fusion temperature is relatively low and unstable.In addition, the ash content in the low sulphur coal is also relatively low, and this also is to cause its ash content fusing point factors of instability.Therefore make that low sulphur coal should not be directly as steam coal.In order to overcome the low and unsettled shortcoming of fusing point of its ash content fusing point, can adopt to the method for wherein adding the high-melting-point additive, but this has just increased cost.On the other hand, for high sulphur coal, ash oontent wherein is also correspondingly higher, though its ash content softening temperature often can reach more than 1250 ℃ and be more stable, but because its sulphur content is higher than 1%, cause the corrosion of boiler easily and cause environmental pollution, so also should not be directly as steam coal.Though high sulphur coal can reduce sulphur content by the method for washing, its processing charges is very high, is very uneconomic therefore.Therefore, people wish to have a kind of can be economical and reasonably utilize above-mentioned low sulphur coal and high sulphur coal method.
In view of the foregoing, the purpose of this invention is to provide a kind of method that improves coal ash fusion temperature by coal blending.Coal blending by this method, low ash content of high-sulfur and high-ash coal and low-sulfur and the low-melting coal of ash content are cooperated, both can overcome the problem that the sulphur content of high sulphur coal exceeds standard, and can overcome the low-melting problem of low-sulfur pit ash again, thereby these two kinds of coals can both economical and reasonably be utilized.
The inventor is through deep discovering, mixes by the weight collocation of suitable proportion according to the sulphur content in the different coals and ash oontent and composition thereof the coal with two or more, even reach above-mentioned purpose of the present invention, so far just finished the present invention.Technical scheme of the present invention is as follows:
1, a kind of method that is used to improve coal ash fusion temperature, it is characterized in that, two or more coal with different sulphur and ash oontent is mixed, obtain finished product mixing coal, the weight ratio that the weight ratio of various coals should make relevant component content in finished product the mixings coal meet following A, B, three regulations of C when cooperating concerns: A, when the gross weight with finished product mixing coal is 100%, S wherein≤1%, and the total amount of ash content is in the scope of 5-15%; B, when being 100% with the ash content gross weight, SiO wherein
2+ Al
2O
3+ CaO 〉=70%; C, be selected from any condition in the following condition (1) to (4): (1) is 100% o'clock with the ash content gross weight, SiO wherein
2+ Al
2O
3〉=70%; (2) with SiO
2+ Al
2O
3+ CaO gross weight is 100% o'clock, SiO wherein
2〉=65%; (3) with SiO
2+ Al
2O
3+ CaO gross weight is 100% o'clock, Al wherein
2O
3〉=25%; (4) with SiO
2+ Al
2O
3+ CaO gross weight is 100% o'clock, CaO wherein 〉=35%.
2, as above-mentioned the 1st described method, it is characterized in that, in the A item, when the gross weight with finished product mixing coal is 100%, S wherein≤0.8%.
3, as the above-mentioned the 1st or the 2nd described method, it is characterized in that, in the A item, when the gross weight with finished product mixing coal is 100%, S wherein≤0.5%.
As above-mentioned the 1st described method, it is characterized in that 4, in the A item, when the gross weight with finished product mixing coal was 100%, ash content total amount wherein was in the scope of 10-15%.
5, as above-mentioned the 1st described method, it is characterized in that, in the B item, when being 100% with the ash content gross weight, SiO wherein
2+ Al
2O
3+ CaO 〉=75%.
6, as above-mentioned the 1st described method, it is characterized in that, in (1) of C item, when being 100% with the ash content gross weight, SiO wherein
2+ Al
2O
3〉=75%.
7, as above-mentioned the 1st described method, it is characterized in that, in the C item, when with SiO
2+ Al
2O
3+ CaO gross weight is 100% o'clock, Al wherein
2O
3〉=25%.
In the above-mentioned the 1st to the 5th, the 1st is essential features, and the 2nd to 7 is the feature that further limits, and also is preferable feature.
Explain the present invention below in more detail.
In the invention described above the 1st scheme, S≤1%th that the A item limits, industrial requirement, therefore as prerequisite, preferably S≤0.8% is more preferably S≤0.5%.In addition, if the total amount of ash content below 5%, then the fusing point of ash content is very unstable, thereby is difficult to guarantee that its softening temperature maintains more than 1250 ℃ (± 50 ℃) always, so its lower value is 5%, is preferably 10%.On the other hand, when the ash content total amount 15% when above, its thermo-efficiency significantly reduces, therefore its higher limit is 15%, when the gross weight when with finished product mixing coal of defined is 100% in the A item of the 1st scheme of the present invention just, wherein the total amount of ash content is in the scope of 5-15%, preferably in the scope of 10-15%.In addition, to be used for regulating the method for coal ash fusion temperature mainly be to rely on to regulate components of coal ash SiO in the present invention
2, Al
2O
3Recently finish with the weight that CaO is mutual.This is because the fusing point of CaO is 2580 ℃, Al
2O
3Fusing point be 2050 ℃, SiO
2Fusing point be 1670 ℃ (tridymites) and 1710 ℃ (cristobalite), therefore,, then, the softening temperature of said composition is reached more than 1250 ℃ as long as improve the content of wherein a certain or two kinds of compositions highlightedly if constitute composition by these three kinds of compositions.According to this design, the inventor is through finding after the deep test, and any condition of adding on the basis of A, two prescribed conditions of B in meeting the invention described above the 1st scheme in 4 kinds of conditions of C item regulation all can make coal ash fusion temperature reach more than 1250 ℃.Wherein, because Al in coal ash usually
2O
3Content relatively low, and contain more amount Al
2O
3The loose easy row of coal ash, so preferred the employing when with SiO
2+ Al
2O
3+ CaO total amount is 100% o'clock, Al wherein
2O
3〉=25% scheme.But this being also had a prerequisite, is exactly SiO
2, Al
2O
3, CaO three total amount must all account for more than certain share in the coal ash, if above-mentioned three's total amount shared share in whole coal ash is low excessively, though the content of some or two compositions among then at this moment outstanding this three still is not enough to softening temperature is adjusted to more than 1250 ℃.Behind overtesting, find, above-mentioned three shared share in whole coal ash must reach defined in the B item of the present invention's the 1st scheme when being 100% with the ash content total amount, SiO wherein
2+ Al
2O
3+ CaO 〉=70%, preferred 〉=75% could reach purpose of the present invention so well.So far to the qualification done among three of A, B in the present invention's the 1st scheme, the C with and preferred feature (being 2-7 scheme of the present invention) carried out detailed explanation.
Compare with the similar technology in existing this area, the invention has the beneficial effects as follows, simple for process, cost is low, do not need specific installation, and can reasonably utilize those not allow the low grade coal that uses as bunker coal under normal conditions because sulphur content or ash oontent exceed standard, this has a very big meaning industrial.
Enumerate embodiment below and further explain the present invention, but the present invention is not subjected to the qualification of these embodiment.
Should illustrate, when experimentizing, in embodiment 1-3, adopt quartz, Wingdale or grey china clay to replace the coal blending of mixing in actual production as the mine cheap products, can more test with lower cost and shorter time like this, and in actual production, need only according to same added ingredients (because S is to coal ash fusion temperature not influence basically, so only consider SiO when experiment
2, Al
2O
3, three kinds of compositions of CaO) add and to mix coal blending and can reach same purpose.A large amount of afterwards fact proved, such blending method is feasible, can under the condition that keeps S≤1% finished product mixing pit ash softening temperature be reached more than 1250 ℃ fully.
Embodiment 1
The be mixed purpose of coal of present embodiment is by with the SiO in the coal ash
2Content is increased to and is equivalent to SiO
2+ Al
2O
3+ CaO total amount 65% with on the coal ash softening temperature is reached more than 1250 (± 50) ℃.The mode of being mixed be with the shipment rotary conveyor on one side with the coal shipment, on one side will be added on the belt of delivering coal of rotary conveyor as the silica powder of mixing ingredients, when belt simultaneously with coal with mix that the two mixed basically when ingredients was continuously come down in torrents in the ship storehouse.
Present embodiment has two experiments, each experiment about 30,000 tons of coals that have been mixed.Each component content (is 100% with the coal ash total amount) and coal ash softening temperature are all listed in the table 1 in preceding main body pit ash total amount of mixing and the coal ash.In addition, also listed the content (with the calcining residue of quartz as 100%) of each composition in calcining residue total amount of mixing the ingredients quartz (with quartz as 100%) and the residue in the table 1.In addition, also listed in the table 1 without the softening temperature of the main body coal coal ash that is mixed and mix join be equivalent to blend together 2% and 3% quartz of coal after, blend together the content of each composition in the coal ash of coal and the coal ash softening temperature that blendes together coal.
In addition, about mention in C item feature (2) the individual optional conditions in preamble the present invention the 1st scheme with SiO
2+ Al
2O
3+ CaO gross weight is 100% o'clock, SiO wherein
2The relation of relevant component content in the ash of listing in 〉=65% this feature and the table 1, can be by the data substitution following formula of following method for normalizing with each component content in the ash:
x＝SiO
2/(SiO
2+Al
2O
3+CaO)
The x value of obtaining like this is required numerical value.The data of associative list 1, this main body coal before being mixed, SiO
2At SiO
2+ Al
2O
3Ratio shared in the+CaO gross weight is 51.7%, does not meet SiO
2〉=65% condition, 1175 ℃ of its coal ash softening temperatures are also undesirable.Similarly calculate according to last method, mix respectively join 2% and 3% quartz after, the SiO in its coal ash
2At SiO
2+ Al
2O
3Ratio shared in the+CaO gross weight becomes 73.6% and 77.9% respectively, meets SiO
2〉=65% condition, its coal ash softening temperature is correspondingly brought up to 1210 ℃ and 1380 ℃ respectively, has all reached the above requirement of 1250 (± 50 ℃).
Embodiment 2
The be mixed purpose of coal of present embodiment is to be equivalent to SiO by the CaO content in the coal ash is increased to
2+ Al
2O
3+ CaO total amount 35% with on the coal ash softening temperature is reached more than 1250 (± 50) ℃.The mode that is mixed is all identical with embodiment 1 with main body coal kind, different just with Wingdale (CaCO
3) replace the quartz among the embodiment 1.
Present embodiment has two experiments, each experiment about 30,000 tons of coals that have been mixed.Before mixing in main body pit ash total amount and the coal ash each component content identical with embodiment 1, also list in the table 1.List file names with the content of the CaO of Wingdale.Two experiments add 1.79% and 3.58% CaCO respectively
3, be respectively 1% and 2% when being converted to CaO.About mention in C item feature (4) the individual optional conditions in the present invention's the 1st scheme with SiO
2+ Al
2O
3+ CaO gross weight is 100% o'clock, and the relation of relevant component content in the ash of listing in CaO wherein 〉=35% and the table 1 can be by the data substitution following formula of following method for normalizing with each component content in the ash
y＝CaO/(SiO
2+Al
2O
3+CaO)
The y value of obtaining like this is required numerical value.The data of associative list 1, this main body coal is before being mixed, and CaO is at SiO
2+ Al
2O
3Ratio shared in the+CaO gross weight is 26.3%, does not meet the condition of CaO 〉=35, and 1175 ℃ of its coal ash softening temperatures are also undesirable.According to same method of calculation, after mixing the lime carbonate of joining 1% and the 2%CaO that are equivalent to blend together coal respectively, the CaO in its coal ash is at SiO
2+ Al
2O
3Ratio shared in the+CaO gross weight becomes 47.7% and 58.7% respectively, and its coal ash softening temperature is correspondingly brought up to 1200 ℃ and 1360 ℃ respectively, all meets the requirement more than 1250 ± (50 ℃).
Embodiment 3
The be mixed purpose of coal of present embodiment is by with the SiO in the coal ash
2+ Al
2O
3Content be increased to be equivalent to the ash content gross weight 70% with on the coal ash softening temperature is reached more than 1250 (± 50) ℃.The mode that is mixed is all identical with embodiment 1 with main body coal kind, different just replace quartz among the embodiment 1 with grey china clay.
Present embodiment has 3 experiments, each experiment about 30,000 tons of coals that have been mixed.Before mixing in main body pit ash total amount and the coal ash each component content identical with embodiment 1, also list in the table 1.List file names with content as each composition in calcining residue total amount (with grey china clay as 100%) of mixing the grey china clay of ingredients and the residue (with the calcining residue of grey china clay as 100%).In addition, also listed in the table 1 and mixed content of joining each composition in the coal ash that blendes together coal behind 3%, the 4% and 5% grey china clay that is equivalent to blend together coal and the coal ash softening temperature that blendes together coal.Is 100% o'clock about what mention in C item feature (1) the individual optional conditions in the present invention's the 1st scheme with the ash content total amount, SiO wherein
2+ Al
2O
3〉=70% method of calculation only need the SiO in each component content one hurdle in the ash of table 1
2With Al
2O
3The content of the two addition simply gets final product.As can be seen from Table 1, when mixing when joining 3%, 4% and 5% the grey china clay that is equivalent to blend together coal the SiO in the coal ash
2+ Al
2O
3Content is respectively 71.04%, 73.92% and 77.14%, all meets the SiO in the coal ash
2+ Al
2O
3〉=70% condition, its coal ash softening temperature correspondingly is respectively 1300 ℃, 1325 ℃ and 1340 ℃, has all reached the requirement more than 1250 (± 50) ℃.
Embodiment 4
The purpose of present embodiment is by hanging down Al
2O
3Content and high Al
2O
3Two kinds of coals of content mix, and make the Al that blendes together in the coal
2O
3Content reaches and is equivalent to SiO
2+ Al
2O
3+ CaO total amount 28% with on the coal ash softening temperature is reached more than 1250 (± 50) ℃.The mode of being mixed is with Al in the coal ash
2O
3Content is Al in 10% main body coal and the coal ash
2O
3Content is 42% the coal blending of mixing, and according to the main body coal: the weight ratio of mixing coal blending=70: 30 cooperates.During cooperation, these two kinds of coals are sent into coal in the big funnel by a reclaimer separately quantitatively, below funnel, there is a rotary conveyor will mix coal and sends into again in the ship storehouse, when this mixing coal is fallen in the ship storehouse, just become the coal that blendes together that mixes basically.As can be seen from Table 1, the Al in blending together the coal coal ash
2O
3Content is 28%, and its softening temperature is 1428 ℃, has reached the requirement more than 1250 ℃.
According to the present invention, can be simply and promptly be mixed and have the coal of different ash oontent in a large number, make some can not be directly used in the coal of boiler even generally be considered to belong to low grade coal and therefore the coal that do not allow to be used for boiler can both have very big industrial value through being directly used in boiler after simply being mixed.
Table 1
Annotate ※: because other composition is less relatively to the influence of coal ash fusion temperature, so unlisted.
--: expression is not analyzed.
Claims (7)
1, a kind of method that is used to improve coal ash fusion temperature, it is characterized in that, two or more coal with different sulphur and ash oontent is mixed, obtain finished product mixing coal, the weight ratio that the weight ratio of various coals should make relevant component content in finished product the mixings coal meet following A, B, three regulations of C when cooperating concerns: A, when the gross weight with finished product mixing coal is 100%, S wherein≤1%, and the total amount of ash content is in the scope of 5-15%; B, when being 100% with the ash content gross weight, SiO wherein
2+ Al
2O
3+ CaO 〉=70%; C, be selected from any condition in the following condition (1) to (4): (1) is 100% o'clock with the ash content gross weight, SiO wherein
2+ Al
2O
3〉=70%; (2) with SiO
2+ Al
2O
3+ CaO gross weight is 100% o'clock, SiO wherein
2〉=65%; (3) with SiO
2+ Al
2O
3+ CaO gross weight is 100% o'clock, Al wherein
2O
3〉=25%; (4) with SiO
2+ Al
2O
3+ CaO gross weight is 100% o'clock, CaO wherein 〉=35%.
2, the method for claim 1 is characterized in that, in the A item, and when the gross weight with finished product mixing coal is 100%, S wherein≤0.8%.
3, method as claimed in claim 1 or 2 is characterized in that, in the A item, and when the gross weight with finished product mixing coal is 100%, S wherein≤0.5%.
4, the method for claim 1 is characterized in that, in the A item, when the gross weight with finished product mixing coal was 100%, ash content total amount wherein was in the scope of 10-15%.
5, the method for claim 1 is characterized in that, in the B item, and when being 100% with the ash content gross weight, SiO wherein
2+ Al
2O
3+ CaO 〉=75%.
6, the method for claim 1 is characterized in that, in (1) of C item, and when being 100% with the ash content gross weight, SiO wherein
2+ Al
2O
3〉=75%.
7, the method for claim 1 is characterized in that, in the C item, when with SiO
2+ Al
2O
3+ CaO gross weight is 100% o'clock, Al wherein
2O
3〉=25%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99118951 CN1093559C (en) | 1999-09-01 | 1999-09-01 | Process for increasing smelting point of coal ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99118951 CN1093559C (en) | 1999-09-01 | 1999-09-01 | Process for increasing smelting point of coal ash |
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|---|---|
| CN1245209A CN1245209A (en) | 2000-02-23 |
| CN1093559C true CN1093559C (en) | 2002-10-30 |
Family
ID=5280608
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|---|---|---|---|
| CN 99118951 Ceased CN1093559C (en) | 1999-09-01 | 1999-09-01 | Process for increasing smelting point of coal ash |
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Families Citing this family (5)
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|---|---|---|---|---|
| CN105567271A (en) * | 2015-12-21 | 2016-05-11 | 神华集团有限责任公司 | Method for mixing coal for solid-state deslagging coal chemistry industry device |
| CN107287000A (en) * | 2016-04-05 | 2017-10-24 | 中国石油化工股份有限公司 | A kind of blending method |
| CN107099356B (en) * | 2017-06-09 | 2020-10-13 | 太原理工大学 | Alumina composite additive for improving civil coke ash melting point, preparation method and application thereof |
| CN108018109A (en) * | 2017-12-18 | 2018-05-11 | 福州大学 | A kind of compound resistance flux for improving low ash smelting point coal ash melting temperature |
| CN110283621A (en) * | 2019-05-30 | 2019-09-27 | 太原理工大学 | A method of improving gasification charred ashes fusing point |
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1999
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