CN108680699A - A kind of test of thermal coal flammability and evaluation method - Google Patents
A kind of test of thermal coal flammability and evaluation method Download PDFInfo
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Abstract
The invention discloses the test of thermal coal flammability and evaluation methods,Using thermobalance under the conditions of temperature programming,At any time by the quality of coal,The variation of temperature,And computer data acquisition is analyzed and is handled,Extract characteristic index parameter,And by these index parameters and with wide range of industrial applications achievement breeze airflow ignition temperature IT indexs (specific test method and its application respectively referring to DL/T1446 2015,The assay method and DL/T831 2015 of breeze airflow ignition temperature,Large capacity coal dust combustion boiler hearth type selecting directive/guide) carry out correlation analysis,It has obtained that single coal can be embodied or has mixed the flameholding index RI for burning Coal Blends Ignition performance,And grade classification is carried out,The test method is tested more easy compared with breeze airflow ignition temperature,With higher discrimination precision,The application of test result industrially can preferably be instructed.
Description
Technical field
The present invention relates to the technical fields for differentiating coal sample flammability, and in particular to a kind of test of thermal coal flammability
And evaluation method, it is suitable for domestic typical power coal, including lignite, bituminous coal, meager coal, anthracite and its mixed coal.
Background technology
Have become one of domestic and international most common method using thermobalance come the combustion characteristics of Study on Coal, it passes through in journey
Under sequence Elevated Temperature Conditions, the quality of Study on Coal at any time, the variation of temperature, carry out data acquisition and processing (DAP) using computer to analyze
Burning of coal process.Coal quality or the difference of experimental condition can all make the thermobalance weight-loss curve of coal that diversity be presented.Existing heat
Balance test result is more the characteristic parameter of the combustion process of description experiment coal sample, and experiment coal sample is obtained by comparing analysis
Flammability, do not provide specific method of discrimination.
Invention content
In order to overcome above-mentioned disadvantage of the existing technology, the purpose of the present invention is to provide a kind of thermal coal flammabilities
Test and evaluation method, and have higher discrimination precision.
In order to achieve the above objectives, the present invention uses following technical scheme:
A kind of test of thermal coal flammability and evaluation method, specifically comprise the following steps:
The first step:General analysis coal sample of the granularity less than 0.2mm, which is made, in coal sample by GB474 becomes analysis sample；
Second step:Analysis sample is tested according to thermogravimetry；
Equipment and reagent requirement:
Crucible:Volume 792mm3, heatproof is more than 1200 DEG C；
Reagent:The oxygen that purity is 99.9%；
Heating rate:20℃/min；
Analysis sample (50 ± 1) mg is weighed, claims standard to 0.01mg and divides in crucible, and record and analyze the initial of sample
Weight m0；Crucible equipped with analysis sample is placed on load sample platform, covers heating furnace body；From the initial temperature of room temperature with 20 DEG C/
The rate of min is warming up to 900 DEG C, charge flow rate:Purity oxygen 100L/h；Startup program starts to test, it is to be combusted after the test
It names and preserves burning sample weight and vary with temperature the burning weight loss TG curves that curve tests coal sample；Burning weight loss TG is bent
Line carries out the burning velocity DTG curves that the curve that differential show that sample combustion speed varies with temperature tests coal sample；
CR=dw/dt
Wherein CR is the burning velocity for testing coal sample, and %/min indicates that unit interval coal dust weight change accounts for experiment coal dust
The percentage of total weight；
Third walks:Characteristic index parameter is extracted according to the DTG curves of experiment coal sample, it is specific as follows：
T1max, maximum combustion speed W1maxCorresponding abscissa temperature value, DEG C；
W1max, typical single power burning of coal speed DTG unimodal curves or typical two kinds of combustibilities difference
Steam coal mixed coal DTG bimodal curves on first burning peak ordinate maximum value i.e. be defined as maximum combustion speed
W1max, %/min；
4th step:Calculate flameholding sex index RI；
RI=0.96T1max-0.3W1max-13
5th step:The flammability for testing coal sample differentiates；
Flameholding index RI reaction powers are caught fire the index of complexity with coal, the index is lower, then sample catches fire
Temperature is lower, and combustion stability is better, and specific evaluation method is as shown in table 1；
Table 1 tests the flammability evaluation criterion of coal sample
Description of the drawings
Fig. 1 is typical single power burning of coal speed DTG unimodal curve schematic diagrames.
Fig. 2 is the burning velocity DTG bimodal curves signal of typical two kinds of combustibilities steam coal mixed coal of difference
Figure.
Fig. 3 is the burning velocity DTG curve synoptic diagrams of 1 Baoqing lignite of embodiment.
Fig. 4 is 2 lignite of embodiment:Anthracite=6:4 burning velocity DTG curve synoptic diagrams.
Fig. 5 is 3 lignite of embodiment:Anthracite=4:6 burning velocity DTG curve synoptic diagrams.
Specific implementation mode
The present invention is described in more detail with reference to the accompanying drawings and detailed description.
As depicted in figs. 1 and 2, a kind of test of thermal coal flammability of the present invention and evaluation method, specifically include as follows
Step:
The first step:General analysis coal sample of the granularity less than 0.2mm, which is made, in coal sample by GB474 becomes analysis sample；
Second step:Analysis sample is tested according to thermogravimetry；
Equipment and reagent requirement:
Crucible:Volume 792mm3, heatproof is more than 1200 DEG C；
Reagent:The oxygen that purity is 99.9%；
Heating rate:20℃/min；
Analysis sample (50 ± 1) mg is weighed, claims standard to 0.01mg and divides in crucible, and record and analyze the initial of sample
Weight m0；Crucible equipped with analysis sample is placed on load sample platform, covers heating furnace body；From the initial temperature of room temperature with 20 DEG C/
The rate of min is warming up to 900 DEG C, charge flow rate:Purity oxygen 100L/h；Startup program starts to test, it is to be combusted after the test
It names and preserves burning sample weight and vary with temperature the burning weight loss TG curves that curve tests coal sample；Burning weight loss TG is bent
Line carries out the burning velocity DTG curves that the curve that differential show that sample combustion speed varies with temperature tests coal sample；
CR=dw/dt
Wherein CR is the burning velocity for testing coal sample, and %/min indicates that unit interval coal dust weight change accounts for experiment coal dust
The percentage of total weight；
Third walks:Characteristic index parameter is extracted according to TG the and DTG curves of experiment coal sample, it is specific as follows：
T1max, ordinate maximum value, that is, maximum combustion speed W on DTG curves in Fig. 1 or Fig. 21maxCorresponding abscissa temperature
Value, DEG C；
W1max, in Fig. 1 on DTG curves typical single power burning of coal speed DTG unimodal curves or or Fig. 2 in it is typical
First burning peak ordinate maximum value is i.e. fixed on the DTG bimodal curves of the steam coal mixed coal of difference for two kinds of combustibilities
Justice is maximum combustion speed W1max, %/min；
4th step:Calculate flameholding sex index RI；
RI=0.96T1max-0.3W1max-13
5th step:The flammability for testing coal sample differentiates；
Flameholding index RI reaction powers are caught fire the index of complexity with coal, the index is lower, then sample catches fire
Temperature is lower, and combustion stability is better, and specific evaluation method is as shown in table 1；
Table 1 tests the flammability evaluation criterion of coal sample
| Differentiate | RI(℃) |
| It is extremely difficult | ≥425 |
| It is difficult | 425-375 |
| It is medium | 375-325 |
| Easily | 325-275 |
| Easily | ＜ 275 |
Embodiment 1:The flammability of single coal Baoqing lignite is tested and evaluation
The first step:General analysis coal sample of the granularity less than 0.2mm, which is made, in coal sample by GB474 becomes analysis sample；
Second step:Analysis sample is tested according to thermogravimetry；
Equipment and reagent requirement:
Crucible:Volume 792mm3, heatproof is more than 1200 DEG C；
Reagent:The oxygen that purity is 99.9%；
Heating rate:20℃/min；
Analysis sample (50 ± 1) mg is weighed, claims standard to 0.01mg and divides in crucible, and record and analyze the initial of sample
Weight m0=50.10mg；Crucible equipped with analysis sample is placed on load sample platform, covers heating furnace body；From the initial temperature of room temperature
Degree is warming up to 900 DEG C with the rate of 20 DEG C/min, charge flow rate:Purity oxygen 100L/h；Startup program starts to test, examination to be combusted
It is named after testing and preserves burning sample weight and vary with temperature the burning weight loss TG curves that curve tests coal sample；It will burning
Weightless TG curves carry out the burning velocity DTG songs that the curve that differential show that sample combustion speed varies with temperature tests coal sample
Line.
CR=dw/dt
Wherein CR is the burning velocity for testing coal sample, and %/min indicates that unit interval coal dust weight change accounts for experiment coal dust
The percentage of total weight.
Third walks:Characteristic index parameter is extracted according to TG the and DTG curves of experiment coal sample, it is specific as follows.
T1max, maximum combustion speed W in Fig. 31maxCorresponding abscissa temperature value, DEG C；
W1max, ordinate maximum value is defined as on typical single power burning of coal speed DTG unimodal curves in Fig. 3
Maximum combustion speed W1max, %/min；
According to fig. 3, T1max=249 DEG C, W1max=34.2748%/min
4th step:Calculate flameholding sex index RI；
RI=0.96T1max-0.3W1max- 13=0.96 × 249-0.3 × 34.2748-13=216
5th step:The flammability for testing coal sample differentiates.
Flameholding index RI reaction powers are caught fire the index of complexity with coal, the index is lower, then sample catches fire
Temperature is lower, and combustion stability is better, and specific evaluation method is as shown in table 1；
The RI of this Baoqing lignite is 216, is less than 275, is belonged to according to the discrimination standard of table 1 its fire behaviour and is easily caught fire
Grade.
Embodiment 2:A kind of lignite and anthracitic mixed coal (lignite:Anthracite=6:4) flammability test and evaluation
The first step:General analysis coal sample of the granularity less than 0.2mm, which is made, in coal sample by GB474 becomes analysis sample；
Second step:Analysis sample is tested according to thermogravimetry；
Equipment and reagent requirement:
Crucible:Volume 792mm3, heatproof is more than 1200 DEG C；
Reagent:The oxygen that purity is 99.9%；
Heating rate:20℃/min；
Analysis sample (50 ± 1) mg is weighed, claims standard to 0.01mg and divides in crucible, and record and analyze the initial of sample
Weight m0=50.10mg；Crucible equipped with analysis sample is placed on load sample platform, covers heating furnace body；From the initial temperature of room temperature
Degree is warming up to 900 DEG C with the rate of 20 DEG C/min, charge flow rate:Purity oxygen 100L/h；Startup program starts to test, examination to be combusted
It is named after testing and preserves burning sample weight and vary with temperature the burning weight loss TG curves that curve tests coal sample；It will burning
Weightless TG curves carry out the burning velocity DTG songs that the curve that differential show that sample combustion speed varies with temperature tests coal sample
Line.
CR=dw/dt
Wherein CR is the burning velocity for testing coal sample, and %/min indicates that unit interval coal dust weight change accounts for experiment coal dust
The percentage of total weight.
Third walks:Characteristic index parameter is extracted according to TG the and DTG curves of experiment coal sample, it is specific as follows.
T1max, maximum combustion speed W in Fig. 41maxCorresponding abscissa temperature value, DEG C；
W1max, typical two kinds of combustibilities are first on the DTG bimodal curves of the steam coal mixed coal of difference in Fig. 4
Burning peak ordinate maximum value is defined as maximum combustion speed W1max, %/min；
According to Fig. 4, T1max=294 DEG C, W1max=29.5313%/min
4th step:Calculate flameholding sex index RI；
RI=0.96T1max-0.3W1max- 13=0.96 × 294-0.3 × 29.5313-13=260
5th step:The flammability for testing coal sample differentiates.
Flameholding index RI reaction powers are caught fire the index of complexity with coal, the index is lower, then sample catches fire
Temperature is lower, and combustion stability is better, and specific evaluation method is as shown in table 1；
This lignite:Anthracite=6:The RI of 4 mixed coals is 260, is less than 275, according to its fire behaviour of the discrimination standard of table 1
Belong to grade of easily catching fire.
Embodiment 3:A kind of lignite and anthracitic mixed coal (lignite:Anthracite=4:6) flammability test and evaluation
The first step:General analysis coal sample of the granularity less than 0.2mm, which is made, in coal sample by GB474 becomes analysis sample；
Second step:Analysis sample is tested according to thermogravimetry；
Equipment and reagent requirement:
Crucible:Volume 792mm3, heatproof is more than 1200 DEG C；
Reagent:The oxygen that purity is 99.9%；
Heating rate:20℃/min；
Analysis sample (50 ± 1) mg is weighed, claims standard to 0.01mg and divides in crucible, and record and analyze the initial of sample
Weight m0=49.90mg；Crucible equipped with analysis sample is placed on load sample platform, covers heating furnace body；From the initial temperature of room temperature
Degree is warming up to 900 DEG C with the rate of 20 DEG C/min, charge flow rate:Purity oxygen 100L/h；Startup program starts to test, examination to be combusted
It is named after testing and preserves burning sample weight and vary with temperature the burning weight loss TG curves that curve tests coal sample；It will burning
Weightless TG curves carry out the burning velocity DTG songs that the curve that differential show that sample combustion speed varies with temperature tests coal sample
Line.
CR=dw/dt
Wherein CR is the burning velocity for testing coal sample, and %/min indicates that unit interval coal dust weight change accounts for experiment coal dust
The percentage of total weight.
Third walks:Characteristic index parameter is extracted according to TG the and DTG curves of experiment coal sample, it is specific as follows.
T1max, maximum combustion speed W in Fig. 51maxCorresponding abscissa temperature value, DEG C；
W1max, typical two kinds of combustibilities are first on the DTG bimodal curves of the steam coal mixed coal of difference in Fig. 5
Burning peak ordinate maximum value is defined as maximum combustion speed W1max, %/min；
According to Fig. 5, T1max=398 DEG C, W1max=28.9418%/min
4th step:Calculate flameholding sex index RI；
RI=0.96T1max-0.3W1max- 130.96 × 398-0.3 × 28.9418-13=360
5th step:The flammability for testing coal sample differentiates.
Flameholding index RI reaction powers are caught fire the index of complexity with coal, the index is lower, then sample catches fire
Temperature is lower, and combustion stability is better, and specific evaluation method is as shown in table 1；
This lignite:Anthracite=4:The RI of 6 mixed coals be 360, be more than 325 be less than 375, according to the discrimination standard of table 1 its
Fire behaviour belongs to medium grade of catching fire.
Claims (1)
1. test and the evaluation method of a kind of thermal coal flammability, it is characterised in that：Specifically comprise the following steps:
The first step:General analysis coal sample of the granularity less than 0.2mm, which is made, in coal sample by GB474 becomes analysis sample；
Second step:Analysis sample is tested according to thermogravimetry；
Equipment and reagent requirement:
Crucible:Volume 792mm3, heatproof is more than 1200 DEG C；
Reagent:The oxygen that purity is 99.9%；
Heating rate:20℃/min；
Analysis sample (50 ± 1) mg is weighed, claims standard to 0.01mg and divides in crucible, and record and analyze the initial weight of sample
m0；Crucible equipped with analysis sample is placed on load sample platform, covers heating furnace body；From the initial temperature of room temperature with 20 DEG C/min's
Rate is warming up to 900 DEG C, charge flow rate:Purity oxygen 100L/h；Startup program starts to test, to be combusted to name after the test simultaneously
It preserves burning sample weight and varies with temperature the burning weight loss TG curves that curve tests coal sample；Burning weight loss TG curves are carried out
Differential show that the curve that sample combustion speed varies with temperature tests the burning velocity DTG curves of coal sample；
CR=dw/dt
Wherein CR is the burning velocity for testing coal sample, and %/min indicates that unit interval coal dust weight change accounts for experiment coal dust gross weight
The percentage of amount；
Third walks:Characteristic index parameter is extracted according to TG the and DTG curves of experiment coal sample, it is specific as follows：
T1max, maximum combustion speed W1maxCorresponding abscissa temperature value, DEG C；
W1max, the power of typical single power burning of coal speed DTG unimodal curves or typical two kinds of combustibilities difference
It is defined as maximum combustion speed W with first burning peak ordinate maximum value on the DTG bimodal curves of coal mixed coal1max, %/
min；
4th step:Calculate flameholding sex index RI；
RI=0.96T1max-0.3W1max-13
5th step:The flammability for testing coal sample differentiates；
Flameholding index RI reaction powers are caught fire the index of complexity with coal, and the index is lower, then the ignition temperature of sample
Lower, combustion stability is better, and specific evaluation method is as shown in table 1；
Table 1 tests the flammability evaluation criterion of coal sample
。
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| CN110146545A (en) * | 2019-06-28 | 2019-08-20 | 陕西煤业化工新型能源有限公司神木分公司 | A method of boiler combustion performance is improved using coal quality burning discriminant index |
| CN111308010A (en) * | 2020-03-18 | 2020-06-19 | 福建省特种设备检验研究院 | Coal-fired coupled solid waste mixable combustion performance comparison and multi-dimensional evaluation method |
| CN114518300A (en) * | 2022-03-17 | 2022-05-20 | 武钢集团昆明钢铁股份有限公司 | Method for discriminating single-blended coal based on thermogravimetric analysis |
| CN114941839A (en) * | 2022-05-12 | 2022-08-26 | 清华大学 | Method for measuring feeding temperature of circulating fluidized bed boiler |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146545A (en) * | 2019-06-28 | 2019-08-20 | 陕西煤业化工新型能源有限公司神木分公司 | A method of boiler combustion performance is improved using coal quality burning discriminant index |
| CN111308010A (en) * | 2020-03-18 | 2020-06-19 | 福建省特种设备检验研究院 | Coal-fired coupled solid waste mixable combustion performance comparison and multi-dimensional evaluation method |
| CN114518300A (en) * | 2022-03-17 | 2022-05-20 | 武钢集团昆明钢铁股份有限公司 | Method for discriminating single-blended coal based on thermogravimetric analysis |
| CN114941839A (en) * | 2022-05-12 | 2022-08-26 | 清华大学 | Method for measuring feeding temperature of circulating fluidized bed boiler |
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