CN113806935A - Method for calculating specific resistance of coal ash - Google Patents
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- 239000010883 coal ash Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 44
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 44
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 44
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 28
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 18
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 14
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 14
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 14
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 14
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 14
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims abstract description 9
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 9
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Inorganic materials O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 238000004458 analytical method Methods 0.000 claims abstract description 6
- 238000004364 calculation method Methods 0.000 claims description 22
- 239000004071 soot Substances 0.000 claims description 6
- 239000003245 coal Substances 0.000 abstract description 24
- 239000000428 dust Substances 0.000 abstract description 9
- 238000009533 lab test Methods 0.000 abstract description 5
- 239000002956 ash Substances 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 239000000446 fuel Substances 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 abstract description 2
- 238000007619 statistical method Methods 0.000 abstract description 2
- 229910002796 Si–Al Inorganic materials 0.000 description 4
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 3
- 239000003830 anthracite Substances 0.000 description 3
- 239000002802 bituminous coal Substances 0.000 description 3
- 239000003077 lignite Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Solid-Fuel Combustion (AREA)
Abstract
The invention discloses a method for calculating specific resistance of coal ash, which comprises the following steps: 1. testing coal ash components according to GB/T1574 coal ash component analysis method, specifically including SiO2、Al2O3、Fe2O3、CaO、MgO、Na2O、K2O、TiO2、MnO2And SO3The components (a); 2. calculating the silicon-aluminum component ratio RSiAl and the sum SSiAl of the silicon-aluminum components; 3. according to Al2O3The values of the components of (3), RSiAl, SSiAl and CaO determine the maximum value ρ of the specific resistance of the coal ashCAmjAnd its corresponding temperature, and calculates its specific value. The method can calculate the highest value of the specific resistance of the coal ash of the coal sample and the corresponding temperature thereof according to the conventional ash component index of the coal quality, is simple, convenient and quick, and has high judgment precision and higher engineering application value as the research result is obtained by carrying out statistical analysis on a large amount of laboratory test data. Can guide fuel purchase and blending coal co-combustion of a power plant, improve the adaptability of coal as fired and an electric dust remover, facilitate the standard discharge of dust and protect the environment。
Description
Technical Field
The invention relates to the technical field of coal ash specific resistance, in particular to a coal ash specific resistance calculation method which is suitable for anthracite, lean coal, bituminous coal and lignite.
Background
The specific resistance of coal ash is one of the key factors influencing the design of an electric dust collector and the efficiency of the electric dust collector, and the specific resistance of coal ash is required to be measured when a boiler is designed. When the specific resistance value of the coal ash is too high, the efficiency of the electric dust collector is reduced, and the problem of difficult dust collection occurs.
The specific resistance of the power plant is basically not tested in the actual operation, and the specific resistance needs to be tested by professional institutions. Therefore, the specific resistance of the incoming coal is difficult to monitor in the daily operation of the power plant, and the problem of the specific resistance of the coal ash is usually noticed when the operation of the dust remover is in trouble, so that the difficulty is brought to the environment-friendly operation of the power plant.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a method for calculating the specific resistance of coal ash, which is suitable for anthracite, lean coal, bituminous coal and lignite.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for calculating specific resistance of coal ash comprises the following steps:
the first step is as follows: testing coal ash components according to GB/T1574 coal ash component analysis method, specifically including SiO2、Al2O3、Fe2O3、CaO、MgO、Na2O、K2O、TiO2、MnO2And SO3Component (b)%;
the second step is that: calculating Si-Al component ratio RSiAl (v) and sum SSiAl (%), and specifically, formula (1) and formula (2)
SSiAl＝SiO2+Al2O3(formula 2)
The third step: according to Al2O3The highest value ρ of the soot specific resistance is calculated from the values of the components of (A), the silicon-aluminum component ratio RSiAl, and the sum of the silicon-aluminum components SSiAl and CaOCAmj(omega cm) and determining the temperature corresponding to the highest value of the specific resistance of the coal ash, wherein the specific principle and the calculation method are as follows:
if Al2O3<25％，1.3≤RSiAl≤4.5，SSiAl<70 percent, the temperature corresponding to the highest value of the specific resistance of the coal ash is 150 ℃, and the highest value rho corresponding to the specific resistance of the coal ash isCAmjSee formula (3) for a calculation formula of (c).
ρCAmj＝(1.24×SSiAl-4.26×Al2O3-0.151×CaO-15.38×RSiAl+46)×1011(formula 3)
If Al is present2O3>40％，RSiAl≤1.3，SSiAl>80% of the total resistance, the temperature corresponding to the maximum value of the specific resistance of coal ash being 150 ℃ and the formula for calculating the maximum value of the specific resistance of coal ash being shown in equation (4).
ρCAmj＝(0.5×Al2O3+7.8×RSiAl+0.2×CaO-25)×1013(formula 4)
Thirdly, under other conditions, the highest value of the specific resistance of the coal ash corresponds to the temperature of 120 ℃, and the calculation formula corresponding to the highest value of the specific resistance of the coal ash refers to the formula (5)
ρCAmj＝(-0.13×SSiAl+0.48×Al2O3+3.8×RSiAl-0.09CaO-5.79)×1012(formula 5)
Compared with the prior art, the invention has the following advantages:
the invention relates to the technical field of coal ash specific resistance, in particular to a coal ash specific resistance calculation method which is suitable for anthracite, lean coal, bituminous coal and lignite.
The invention has the advantages that: the method can calculate the highest value of the specific resistance of the coal ash of the coal sample and the corresponding temperature thereof according to the conventional ash component index of the coal quality, and is simple, convenient and quick. Secondly, the result is obtained by carrying out statistical analysis on a large number of laboratory test results, the calculation precision is high, and the method has high engineering application value. And the fuel purchasing and coal blending combustion of the power plant can be guided, the adaptability of the coal as fired and the electric dust remover is improved, the standard discharge of dust is facilitated, and the environment is protected.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1 coal ash specific resistance prediction for sample 1
The present invention will be described in further detail with reference to examples.
The first step is as follows: testing coal ash components (specifically including SiO) according to GB/T1574 coal ash component analysis method2、Al2O3、Fe2O3、CaO、MgO、Na2O、K2O、TiO2、MnO2And SO3Component (c)%).
The coal ash component test result of the coal sample at this time is as follows:
SiO2＝30.88％、Al2O3＝15.99％、Fe2O3＝7.95％、CaO＝30.7％、MgO＝1.08％、Na2O＝0.44％、K2O＝0.85％、TiO2＝0.76％、MnO20.35% and SO3＝9.01％；
The second step is that: calculating Si-Al component ratio RSiAl (v) and sum SSiAl (%), and specifically, formula (1) and formula (2)
SSiAl＝SiO2+Al2O3(formula 2)
The results of RSiAl (/) and SSiAl (%) calculation of this coal sample are as follows:
SSiAl＝SiO2+Al2O3＝30.88+15.99＝46.87％
the third step: according to Al2O3The highest value ρ of the soot specific resistance is calculated from the values of the components of (A), the silicon-aluminum component ratio RSiAl, and the sum of the silicon-aluminum components SSiAl and CaOCAmj(omega cm) and determining the highest temperature corresponding to the highest value of the specific resistance of the coal ash, wherein the specific principle and the calculation method are as follows:
if Al2O3<25％，1.3≤RSiAl≤4.5，SSiAl<70 percent, the temperature corresponding to the highest value of the specific resistance of the coal ash is 150 ℃, and the highest value rho corresponding to the specific resistance of the coal ash isCAmjSee formula (3) for a calculation formula of (c).
ρCAmj＝(1.24×SSiAl-4.26×Al2O3-0.151×CaO-15.38×RSiAl+46)×1011(formula 3)
② if Al2O3>40％，RSiAl≤1.3，SSiAl>80% of the total resistance, the temperature corresponding to the maximum value of the specific resistance of coal ash being 150 ℃ and the formula for calculating the maximum value of the specific resistance of coal ash being shown in equation (4).
ρCAmj＝(0.5×Al2O3+7.8×RSiAl+0.2×CaO-25)×1013(formula 4)
Thirdly, under other conditions, the temperature corresponding to the highest value of the specific resistance of the coal ash is 120 ℃, and the calculation formula corresponding to the highest value of the specific resistance of the coal ash is shown in the formula (5)
ρCAmj＝(-0.13×SSiAl+0.48×Al2O3+3.8×RSiAl-0.09CaO-5.79)×1012(formula 5)
Al of this coal sample2O3＝15.99％<25％，1.3≤RSiAl＝1.93≤4.5，SSiAl＝46.87％<70% and therefore corresponds to the maximum value ρ of the specific resistance of the coal ashCAmjSee formula (3) for the calculation formula of (c),and the corresponding temperature of the highest specific resistance is 150 ℃;
ρCAmj＝(1.24×SSiAl-4.26×Al2O3-0.151×CaO-15.38×RSiAl+46)×1011
＝(1.24×46.87-4.26×15.99-0.151×30.7-15.38×1.93+46)×1011
＝1.68×1011
the following table shows the laboratory test results, which show that the specific resistance of the coal sample reaches the highest value at 150 ℃, and the corresponding specific resistance value is 1.25 multiplied by 1011The highest value of predicted specific resistance of coal ash is 1.68 multiplied by 1011It can be seen that the prediction result is very close to the actual measurement result, and the method has higher prediction precision.
Example 2 coal ash specific resistance prediction for sample 2
The present invention will be described in further detail with reference to examples.
The first step is as follows: testing coal ash components (specifically including SiO) according to GB/T1574 coal ash component analysis method2、Al2O3、Fe2O3、CaO、MgO、Na2O、K2O、TiO2、MnO2And SO3Component (c)%).
The coal ash component test result of the coal sample at this time is as follows:
SiO2＝43.60％、Al2O3＝44.15％、Fe2O3＝2.91％、CaO＝4.76％、MgO＝0.67％、Na2O＝0.01％、K2O＝0.76％、TiO2＝0.47％、MnO20.04% and SO3＝2.95％；
The second step is that: calculating Si-Al component ratio RSiAl (v) and sum SSiAl (%), and specifically, formula (1) and formula (2)
SSiAl＝SiO2+Al2O3(formula 2)
The results of RSiAl (/) and SSiAl (%) calculation of this coal sample are as follows:
SSiAl＝SiO2+Al2O3＝43.60+44.15＝87.75％
the third step: according to Al2O3The highest value ρ of the soot specific resistance is calculated from the values of the components of (A), the silicon-aluminum component ratio RSiAl, and the sum of the silicon-aluminum components SSiAl and CaOCAmj(omega cm) and determining the highest temperature corresponding to the highest value of the specific resistance of the coal ash, wherein the specific principle and the calculation method are as follows:
if Al2O3<25％，1.3≤RSiAl≤4.5，SSiAl<70 percent, the temperature corresponding to the highest value of the specific resistance of the coal ash is 150 ℃, and the highest value rho corresponding to the specific resistance of the coal ash isCAmjSee formula (3) for a calculation formula of (c).
ρCAmj＝(1.24×SSiAl-4.26×Al2O3-0.151×CaO-15.38×RSiAl+46)×1011(formula 3)
② if Al2O3>40％，RSiAl≤1.3，SSiAl>80% of the total resistance, the temperature corresponding to the maximum value of the specific resistance of coal ash being 150 ℃ and the formula for calculating the maximum value of the specific resistance of coal ash being shown in equation (4).
ρCAmj＝(0.5×Al2O3+7.8×RSiAl+0.2×CaO-25)×1013(formula 4)
Thirdly, under other conditions, the temperature corresponding to the highest value of the specific resistance of the coal ash is 120 ℃, and the calculation formula corresponding to the highest specific resistance is shown in the formula (5)
ρCAmj＝(-0.13×SSiAl+0.48×Al2O3+3.8×RSiAl-0.09CaO-5.79)×1012(formula 5)
Al of this coal sample2O3＝44.15％>40％，RSiAl＝0.99≤1.3，SSiAl＝87.75>80% in the second case, and thus corresponds to the highest specific resistance ρCAmjThe calculation is shown in the formula (4), and the temperature corresponding to the highest specific resistance is 150 ℃;
ρCAmj＝(0.5×Al2O3+7.8×RSiAl+0.2×CaO-25)×1013
＝(0.5×44.15+7.8×0.99+0.2×4.76-25)×1013
＝5.75×1013
the following table shows the laboratory test results, which show that the specific resistance of the coal sample reaches the highest value at 150 ℃, and the corresponding specific resistance value is 6.45 multiplied by 1013The highest predicted specific resistance value of coal ash is 5.75 multiplied by 1013It can be seen that the prediction result is very close to the actual measurement result, and the method has higher prediction precision.
Example 3 coal Ash specific resistance prediction for sample 3
The present invention will be described in further detail with reference to examples.
The first step is as follows: testing coal ash components (specifically including SiO) according to GB/T1574 coal ash component analysis method2、Al2O3、Fe2O3、CaO、MgO、Na2O、K2O、TiO2、MnO2And SO3Component (c)%).
The coal ash component test result of the coal sample at this time is as follows:
SiO2＝50.91％、Al2O3＝31.24％、Fe2O3＝6.06％、CaO＝5.68％、MgO＝1.24％、Na2O＝0.64％、K2O＝1.32％、TiO2＝1.08％、MnO2not equal to 0.074% and SO3＝1.23％；
The second step is that: calculating Si-Al component ratio RSiAl (v) and sum SSiAl (%), and specifically, formula (1) and formula (2)
SSiAl＝SiO2+Al2O3(formula 2)
The results of RSiAl (/) and SSiAl (%) calculation of this coal sample are as follows:
SSiAl＝SiO2+Al2O3＝50.91+31.24＝82.15％
the third step: according to Al2O3The highest value ρ of the soot specific resistance is calculated from the values of the components of (A), the silicon-aluminum component ratio RSiAl, and the sum of the silicon-aluminum components SSiAl and CaOCAmj(omega cm) and determining the highest temperature corresponding to the highest value of the specific resistance of the coal ash, wherein the specific principle and the calculation method are as follows: :
if Al2O3<25％，1.3≤RSiAl≤4.5，SSiAl<70 percent, the temperature corresponding to the highest value of the specific resistance of the coal ash is 150 ℃, and the highest value rho corresponding to the specific resistance of the coal ash isCAmjSee formula (3) for a calculation formula of (c).
ρCAmj＝(1.24×SSiAl-4.26×Al2O3-0.151×CaO-15.38×RSiAl+46)×1011(formula 3)
② if Al2O3>40％，RSiAl≤1.3，SSiAl>80% of the total resistance, the temperature corresponding to the maximum value of the specific resistance of coal ash being 150 ℃ and the formula for calculating the maximum value of the specific resistance of coal ash being shown in equation (4).
ρCAmj＝(0.5×Al2O3+7.8×RSiAl+0.2×CaO-25)×1013(formula 4)
Thirdly, under other conditions, the temperature corresponding to the highest value of the specific resistance of the coal ash is 120 ℃, and the calculation formula corresponding to the highest value of the specific resistance of the coal ash is shown in the formula (5)
ρCAmj＝(-0.13×SSiAl+0.48×Al2O3+3.8×RSiAl-0.09CaO-5.79)×1012(formula 5)
Al of this coal sample2O3The third case is 31.24%, RSiAl 1.63, SSiAl 82.15%, and thus corresponds to the highest value ρ of the soot specific resistanceCAmjThe calculation of (2) is shown in a formula (5), and the corresponding temperature of the highest value of the specific resistance of the coal ash is 120 ℃;
ρCAmj＝(-0.13×SSiAl+0.48×Al2O3+3.8×RSiAl-0.09CaO-5.79)×1012
＝(-0.13×82.15+0.48×31.24+3.8×1.63-0.09×5.68-5.79)×1012
＝4.21×1012
the following table shows the laboratory test results, which show that the specific resistance of the coal sample reaches the highest value at 150 ℃, and the corresponding specific resistance value is 4.30 multiplied by 1012The highest value of the predicted specific resistance of coal ash is 4.21 multiplied by 1012It can be seen that the prediction result is very close to the actual measurement result, and the method has higher prediction precision.
Claims (1)
1. A method for calculating specific resistance of coal ash, which is characterized by comprising the following steps: the method comprises the following steps:
the first step is as follows: testing coal ash components according to GB/T1574 coal ash component analysis method, specifically including SiO2、Al2O3、Fe2O3、CaO、MgO、Na2O、K2O、TiO2、MnO2And SO3The composition of (a), in%;
the second step is that: calculating the silicon-aluminum component ratio RSiAl, calculating the sum SSiAl of the silicon-aluminum components, wherein the unit is percent, see formula (1) and formula (2)
SSiAl＝SiO2+Al2O3(formula 2)
The third step: according to Al2O3The highest value ρ of the soot specific resistance is calculated from the values of the components of (A), the silicon-aluminum component ratio RSiAl, and the sum of the silicon-aluminum components SSiAl and CaOCAmjDetermining the temperature corresponding to the highest value of the specific resistance of the coal ash in the unit of omega cm, and calculating the specific value of the specific resistance of the coal ash, wherein the specific principle is as follows:
if Al2O3<25％，1.3≤RSiAl≤4.5，SSiAl<70 percent, the temperature corresponding to the highest value of the specific resistance of the coal ash is 150 ℃, and the highest value rho corresponding to the specific resistance of the coal ash isCAmjSee formula (3)
ρCAmj＝(1.24×SSiAl-4.26×Al2O3-0.151×CaO-15.38×RSiAl+46)×1011(formula 3)
② if Al2O3>40％，RSiAl≤1.3，SSiAl>80% of the total resistance, the temperature corresponding to the maximum value of the specific resistance of coal ash being 150 ℃ and the formula for calculating the maximum value of the specific resistance of coal ash being shown in equation (4).
ρCAmj＝(0.5×Al2O3+7.8×RSiAl+0.2×CaO-25)×1013(formula 4)
Thirdly, under other conditions, the highest value of the specific resistance of the coal ash corresponds to the temperature of 120 ℃, and the calculation formula corresponding to the highest value of the specific resistance of the coal ash refers to the formula (5)
ρCAmj＝(-0.13×SSiAl+0.48×Al2O3+3.8×RSiAl-0.09CaO-5.79)×1012(formula 5).
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