CN107219325A - A kind of boiler uses the test method of discrimination of high sodium coal and its mixed coal contamination - Google Patents
A kind of boiler uses the test method of discrimination of high sodium coal and its mixed coal contamination Download PDFInfo
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- CN107219325A CN107219325A CN201710295279.4A CN201710295279A CN107219325A CN 107219325 A CN107219325 A CN 107219325A CN 201710295279 A CN201710295279 A CN 201710295279A CN 107219325 A CN107219325 A CN 107219325A
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Abstract
The present invention relates to the test method of discrimination that a kind of boiler uses high sodium coal and its mixed coal contamination, it belongs to boiler fired coal field.Present invention test method of discrimination step is as follows：1）Prepare sample powder sample；2）System ash：Powder sample is placed in cupel, and is fully ashed in Muffle furnace；3）Detection：Silica and calcium oxide content in each ash of detection；4）Differentiate contamination：Size based on silica and calcium oxide ratio in high sodium coal or high sodium coal blending coal ash judges contamination.Method of testing simple and fast of the present invention, cost is low, and the degree of accuracy and high resolution, the cycle are short, differentiates accurate to experiment coal sample fouling characteristics.
Description
Technical field
The present invention relates to a kind of method of discrimination, the survey of high sodium coal and its mixed coal contamination is used more particularly, to a kind of boiler
Method of discrimination is tried, it belongs to boiler fired coal field.
Background technology
Coal-burning boiler is the visual plant of thermal power generation unit, and boiler type selecting, the important evidence of structure design are exactly coal,
The boiler that characteristic for coal is designed can show stabilization, efficient, environmentally friendly, adaptable advantage in operation.China
Coal resource distribution is wide, and coal difference is big.It is accumulative by 2013 to verify accurate eastern 213,600,000,000 tons of the coal reserves in Xinjiang, it is that the four of Xinjiang are big
One of coalfield, is also the self-contained coalfield of current Largest In China, but has very big spy using the accurate eastern coal in Xinjiang as the high sodium coal of representative
Calcium oxide, sodium oxide content are high in the opposite sex, the coal ash of this kind of coal, and silica, alchlor content are low.In general, in ash
The high coal of sodium oxide content has stronger contamination, and ash causes the contamination of convection heating surface, stains and endangers larger to boiler, can
Cause that boiler output is not enough, efficiency is low, can not even run, therefore, for the boiler of high sodium coal, its heating power index, convection current by
The arrangement in hot face can do and significantly adjust, and these adjustment often bring the increase of manufacturing cost, limit accurate eastern coal
Large-scale use.But not all high sodium coal and its mixed coal all have serious contamination, therefore accurately judge high sodium coal and its mixed
The contamination of coal is extremely important, in order to avoid situations such as occurring judging by accident and cause boiler manufacture cost increase, operation bad adaptability.
Found by document and experiment, boiler fired coal stains has direct correlation with sodium oxide molybdena, oxidation Potassium release in ash,
Coal is in burning, and unstability sodium, potassium are discharged with gas phase in coal, are existed in high-temperature flue gas, runs into heating surface and condenses and facilitates
Stain.
Now judge that coal ash contamination mainly there are several indexs, such as sodium oxide molybdena in ash（Na2O）Content, equivalent sodium oxide molybdena
（Na2O+0.66K2O）Content, fouling index（B/A*Na2O, wherein B are CaO, MgO, Fe in ash2O3、Na2O、K2O content sum,
A is SiO in ash2、Al2O3、TiO2Content sum）.
Patent document 1：Publication date is on 07 23rd, 2014, in Publication No. 103940843A Chinese patent, open
A kind of a kind of patent of invention of entitled " test method of discrimination of boiler fired coal contamination ".The patent proposes B/A* ψmax
(Na2O+0.66K2O）Judge coal ash contamination.
Patent document 2：Publication date is on 02 22nd, 2017, in Publication No. 104502218B Chinese patent, open
A kind of patent of invention of entitled " a kind of short-cut method for differentiating coal ash contamination characteristic ".The patent proposes that sintering ratio reaches
Corresponding temperature is initial sintering temperature when 30%, and differentiates contamination grade according to initial sintering temperature.
Utilize Na in ash2O content judges that coal ash contamination accuracy rate is minimum, and silica, alundum (Al2O3) belong in ash
Acidic materials, these materials are to Na2O has absorption（Physical absorption, chemisorbed）Effect, that is to say, that when silica in ash,
When alundum (Al2O3) content is high, even if Na2O content is high, and the contamination of coal ash is also weaker.
In addition, potassium oxide falls within the material for triggering and staiing in ash, it should also take into account, it is proposed that equivalent sodium oxide molybdena
（Na2O+0.66K2O）Content's index, but also without the influence for considering silica, alundum (Al2O3) in ash, accuracy rate is not yet
Height, so utilizing equivalent in ash（Na2O+0.66K2O）Content judges that contamination accuracy rate is relatively low.
Further to improve judging nicety rate, it is proposed that fouling index（B/A*Na2O）Method of discrimination, it is contemplated that it is acid
The influence of material, differentiates that accuracy rate is improved compared with single component, but sodium oxide molybdena, potassium have stability and instable in ash, unstable
Qualitative sodium oxide molybdena, potassium are contributed to contamination, and stability sodium oxide molybdena, potassium are to staiing no contribution, therefore the accuracy rate of fouling index
It is relatively high.
Patent document 1 is further improved on the basis of fouling index method, improves the accuracy rate of index, but is tested
Journey is cumbersome, and the cycle is long, and a kind of high sodium coal is at least ashed 4 times, and the sample being each ashed needs to carry out ash component analysis.For judging
The contamination of mixed coal and suitable mixing proportion is selected, workload is by increase at double.
The drawbacks of patent document 2 is compared with patent document 1 is become apparent from, and a kind of high sodium coal is at least ashed 12 times, the sample being each ashed
Product must all sieve, and for judging the contamination of mixed coal and selecting suitable mixing proportion, workload is also by increase at double.
Another method for judging contamination is exactly that coal is tried using testing stand to burn, and examination burning test is most accurate, but the cycle
Long, cost is high, subject to conditions, it is desirable to have special testing stand, only efficiently, R＆D institution just have, applicability is limited.
In summary, either accuracy rate is low or cost height, cycle length, workload are big for existing determination methods.
The content of the invention
It is an object of the invention to overcome above shortcomings in the prior art, and it is simply fast to provide a kind of method of testing
Victory, cost is low, and the degree of accuracy and high resolution, the cycle are short, differentiates that accurate boiler uses high sodium coal to experiment coal sample fouling characteristics
And its test method of discrimination of mixed coal contamination.
The present invention the used technical scheme that solves the above problems is：The boiler uses high sodium coal and its mixed coal contamination
Test method of discrimination, it is characterised in that：Comprise the following steps：
1）Prepare sample powder sample：Sample to be detected is milled into powder, granularity is less than 0.2mm；
2）System ash：Powder sample is equably shakeout in cupel, its quality every square centimeter is no more than 0.15g, cupel is sent
Enter furnace temperature no more than the gap in 100 DEG C of Muffle furnace flat-temperature zone, shut fire door and make fire door leave 15mm or so, no less than
Furnace temperature is slowly increased to 500 DEG C in 30min time, and at this temperature calcination untill mass change is no more than 0.1%, with
Quality after last time calcination is the calculation basis of ash content；
3）Detection：Silica and calcium oxide content in each ash of detection；
4）Differentiate contamination：Directly judged to stain spy according to the ratio of silica in ash and calcium oxide content for high sodium coal
Property, it can calculate silica and oxidation in ash after mixing according to mixing proportion, blending pit ash and ash component for mixed coal
The ratio of calcium content judges fouling characteristics.
Preferably, the present invention is with SiO2/ CaO judges SiO in coal ash contamination, ash2When/CaO is more than 4, it is determined as weak be stained with
Dirt；Work as SiO2When/CaO is less than 4, it is determined as with certain contamination, and SiO2/ CaO is smaller, and grey contamination is stronger.
Preferably, SiO in mixed coal ash of the present invention2/ CaO can by directly detect or according to mixed coal ash component can
Additive property is calculated, and the ratio of high sodium coal is C in definition blending coal1, the ratio of other blending samples is 1-C1, high sodium coal ash
It is divided into A1, the ash content of other samples is A2, dioxide-containing silica is W in high sodium coal ash1, calcium oxide content is W in high sodium coal ash2,
Dioxide-containing silica is W in other sample ashes3, calcium oxide content is W during other samples are grey4, then mixed coal ash SiO2/CaO=
(C1*A1*W1+(1-C1)*A2*W3)/ (C1*A1*W2+(1-C1)*A2*W4)。
The present invention compared with prior art, with advantages below and effect：Suitable for the differentiation of the grey contamination of mixed coal, greatly
Simplify the process of the test of the suitable high sodium coal mixing proportion of selection；High with accuracy rate, cost is low, and the cycle is short, improves test effect
Rate, adaptability is wider.
Embodiment
With reference to embodiment, the present invention is described in further detail, following examples be explanation of the invention and
The invention is not limited in following examples.
With multicolored gulf coal, accurate eastern coal 3, accurate eastern coal 3：Low sodium coal=40:60th, accurate eastern coal 3：Low sodium coal：Oil shale=51:40:
9th, accurate eastern coal 3：Low sodium coal：Oil shale=59.5:30:10.5th, accurate eastern coal 3：Low sodium coal：Oil shale=68:20:12nd, accurate eastern coal 3：
Low sodium coal：Oil shale=76.5:10:13.5th, accurate eastern coal 3：Oil shale=85:15 grade boiler fired coals to the present embodiment furtherly
It is bright.
Embodiment 1
As the multicolored gulf coal and the method for testing of the accurate eastern contamination of coal 3 of boiler fired coal, comprise the following steps：
1）Prepare sample powder sample：Multicolored gulf coal to be detected and accurate eastern coal 3 are milled into powder；The granularity of two kinds of coals is both less than
0.2mm。
2）System ash：Two kinds of powder samples are equably shakeout in cupel respectively, the quality for making its every square centimeter is no more than
0.15g, cupel is sent into Muffle furnace flat-temperature zone of the furnace temperature no more than 100 DEG C, fire door is shut and fire door is left 15mm or so
Gap, furnace temperature is slowly increased to 500 DEG C within the time no less than 30min, and at this temperature calcination to mass change not
Untill 0.1%.
3）Detection：Two in silica and calcium oxide content in the multicolored gulf coal ash of detection and the accurate eastern ash of coal 3, multicolored gulf coal ash
The content of silica and calcium oxide is respectively：9.68% and 31.30%, the content point of silica and calcium oxide in the quasi- east ash of coal 3
It is not：28.10% and 19.57%.
4）Differentiate contamination：SiO in multicolored gulf coal ash2/ CaO is 0.31, much smaller than 4, is determined as that contamination is very strong, at present
Multicolored gulf coal can not be individually used on pulverized-coal fired boiler, and power plant's actual conditions meet.SiO in the quasi- east ash of coal 32/ CaO is 1.44,
Much smaller than 4, it is determined as that contamination is very strong, accurate eastern coal 3, and power plant's actual conditions symbol can not be individually used on current pulverized-coal fired boiler
Close.
Embodiment 2
The accurate eastern coal 3 of 6 kinds of mixed coals used as boiler：Low sodium coal=40:60th, accurate eastern coal 3：Low sodium coal：Oil shale=51:40:9、
Quasi- east coal 3：Low sodium coal：Oil shale=59.5:30:10.5th, accurate eastern coal 3：Low sodium coal：Oil shale=68:20:12nd, accurate eastern coal 3：It is low
Sodium coal：Oil shale=76.5:10:13.5th, accurate eastern coal 3：Oil shale=85:The method of testing of 15 contaminations, comprises the following steps：
1）Prepare sample powder sample：By the accurate eastern coal 3 of 6 kinds of mixed coals to be detected：Low sodium coal=40:60th, accurate eastern coal 3：Low sodium coal：Oil shale=
51:40:9th, accurate eastern coal 3：Low sodium coal：Oil shale=59.5:30:10.5th, accurate eastern coal 3：Low sodium coal：Oil shale=68:20:12nd, it is accurate
Eastern coal 3：Low sodium coal：Oil shale=76.5:10:13.5th, accurate eastern coal 3：Oil shale=85:15 are all milled into powder；The granularity of six kinds of coals
Both less than 0.2mm.
2）System ash：Six kinds of powder samples are equably shakeout in cupel respectively, the quality for making its every square centimeter is no more than
0.15g, cupel is sent into Muffle furnace flat-temperature zone of the furnace temperature no more than 100 DEG C, fire door is shut and fire door is left 15mm or so
Gap, furnace temperature is slowly increased to 500 DEG C within the time no less than 30min, and at this temperature calcination to mass change not
Untill 0.1%.
3）Detection：The accurate eastern coal 3 of 6 kinds of mixed coals of detection：Low sodium coal=40:60th, accurate eastern coal 3：Low sodium coal：Oil shale=51:40:9、
Quasi- east coal 3：Low sodium coal：Oil shale=59.5:30:10.5th, accurate eastern coal 3：Low sodium coal：Oil shale=68:20:12nd, accurate eastern coal 3：It is low
Sodium coal：Oil shale=76.5:10:13.5th, accurate eastern coal 3：Oil shale=85:Silica and calcium oxide content in 15 ashes, it is detected
As a result it is as follows：
4）Differentiate contamination：Quasi- east coal 3：Low sodium coal=40:SiO in 60 ashes2/ CaO is 3.57, less than 4, is determined as having necessarily
Contamination, but be closer to 4, contamination is not strong, needs optimization design and reinforcement soot blowing to use safely when power plant uses,
Meet with Manas power plant actual conditions.Quasi- east coal 3：Low sodium coal：Oil shale=51:40:SiO in 9 ashes2/ CaO is 5.64 judgements
For weak contamination；Quasi- east coal 3：Low sodium coal：Oil shale=59.5:30:SiO in 10.5 ashes2/ CaO is determined as weak contamination for 10.88
Property；Quasi- east coal 3：Low sodium coal：Oil shale=68:20:SiO in 12 ashes2/ CaO is determined as weak contamination for 11.35；Quasi- east coal 3：It is low
Sodium coal：Oil shale=76.5:10:SiO in 13.5 ashes2/ CaO is determined as weak contamination for 8.46；Quasi- east coal 3：Oil shale=85:15
SiO in ash2/ CaO is determined as weak contamination for 8.36；This five kinds of mixed coals are brought when power plant uses without special consideration contamination
The problem of, and Manas power plant practical operation situation meets.
By above-mentioned elaboration, those skilled in the art can implement.
Furthermore, it is necessary to explanation, the specific embodiment described in this specification, is named the shape of its parts and components
Title etc. can be different, and the above content described in this specification is only to structure example explanation of the present invention.It is all according to
The equivalence changes or simple change done according to the construction described in inventional idea of the present invention, feature and principle, are included in this hair
In the protection domain of bright patent.Those skilled in the art can do various to described specific embodiment
The modification of various kinds or supplement or using similar mode substitute, without departing from the present invention structure or surmount present claims
Scope defined in book, all should belong to protection scope of the present invention.
Claims (3)
1. a kind of boiler uses the test method of discrimination of high sodium coal and its mixed coal contamination, it is characterised in that：Comprise the following steps：
1）Prepare sample powder sample：Sample to be detected is milled into powder, granularity is less than 0.2mm；
2）System ash：Powder sample is equably shakeout in cupel, its quality every square centimeter is no more than 0.15g, cupel is sent
Enter furnace temperature no more than the gap in 100 DEG C of Muffle furnace flat-temperature zone, shut fire door and make fire door leave 15mm or so, no less than
Furnace temperature is slowly increased to 500 DEG C in 30min time, and at this temperature calcination untill mass change is no more than 0.1%, with
Quality after last time calcination is the calculation basis of ash content；
3）Detection：Silica and calcium oxide content in each ash of detection；
4）Differentiate contamination：Directly judged to stain spy according to the ratio of silica in ash and calcium oxide content for high sodium coal
Property, it can calculate silica and oxidation in ash after mixing according to mixing proportion, blending pit ash and ash component for mixed coal
The ratio of calcium content judges fouling characteristics.
2. boiler according to claim 1 uses the test method of discrimination of high sodium coal and its mixed coal contamination, its feature exists
In：With SiO2/ CaO judges SiO in coal ash contamination, ash2When/CaO is more than 4, it is determined as weak contamination；Work as SiO2/ CaO is less than 4
When, it is determined as with certain contamination, and SiO2/ CaO is smaller, and grey contamination is stronger.
3. boiler according to claim 1 uses the test method of discrimination of high sodium coal and its mixed coal contamination, its feature exists
In：SiO in mixed coal ash2/ CaO can by directly detect or according to mixed coal ash component can additive property calculate, define
The ratio for blending high sodium coal in coal is C1, the ratio of other blending samples is 1-C1, high sodium coal ash is divided into A1, the ash of other samples
It is divided into A2, dioxide-containing silica is W in high sodium coal ash1, calcium oxide content is W in high sodium coal ash2, titanium dioxide during other samples are grey
Silicone content is W3, calcium oxide content is W during other samples are grey4, then mixed coal ash SiO2/CaO=(C1*A1*W1+(1-C1)*A2*
W3)/ (C1*A1*W2+(1-C1)*A2*W4)。
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108119896A (en) * | 2017-12-18 | 2018-06-05 | 国网新疆电力有限公司电力科学研究院 | It is a kind of to improve accurate eastern coal combustion slagging, the multifuel combustion method of fouling characteristics |
| CN108226670A (en) * | 2017-12-04 | 2018-06-29 | 华北电力大学（保定） | A kind of method using each electric field trapping coal/biomass multifuel combustion ash of carbon isotope instruction electric precipitator |
| CN109609242A (en) * | 2019-01-16 | 2019-04-12 | 华电电力科学研究院有限公司 | The modulation material of quasi- eastern coal combustion product structure can be changed and in the method to generate electricity, large scale uses quasi- eastern coal in heating boiler |
| CN110470588A (en) * | 2019-07-30 | 2019-11-19 | 东方电气集团东方锅炉股份有限公司 | A kind of prediction technique of biomass fuel to boiler plant likelihood of corrosion |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108226670A (en) * | 2017-12-04 | 2018-06-29 | 华北电力大学（保定） | A kind of method using each electric field trapping coal/biomass multifuel combustion ash of carbon isotope instruction electric precipitator |
| CN108119896A (en) * | 2017-12-18 | 2018-06-05 | 国网新疆电力有限公司电力科学研究院 | It is a kind of to improve accurate eastern coal combustion slagging, the multifuel combustion method of fouling characteristics |
| CN109609242A (en) * | 2019-01-16 | 2019-04-12 | 华电电力科学研究院有限公司 | The modulation material of quasi- eastern coal combustion product structure can be changed and in the method to generate electricity, large scale uses quasi- eastern coal in heating boiler |
| CN109609242B (en) * | 2019-01-16 | 2020-06-30 | 华电电力科学研究院有限公司 | Material preparation capable of changing structure of combustion product of eastern Junggar coal and method for combusting eastern Junggar coal in large proportion in power generation and heat supply boilers |
| CN110470588A (en) * | 2019-07-30 | 2019-11-19 | 东方电气集团东方锅炉股份有限公司 | A kind of prediction technique of biomass fuel to boiler plant likelihood of corrosion |
| CN110470588B (en) * | 2019-07-30 | 2022-05-31 | 东方电气集团东方锅炉股份有限公司 | Method for predicting corrosion possibility of biomass fuel to boiler equipment |
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