CN113806935B - Calculation method of coal ash specific resistance - Google Patents
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- 239000010883 coal ash Substances 0.000 title claims abstract description 69
- 238000004364 calculation method Methods 0.000 title claims description 21
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 41
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 14
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 229910010413 TiO 2 Inorganic materials 0.000 claims abstract description 9
- 238000004458 analytical method Methods 0.000 claims abstract description 3
- 239000003245 coal Substances 0.000 abstract description 23
- 239000004071 soot Substances 0.000 abstract description 11
- 239000000428 dust Substances 0.000 abstract description 7
- 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
- 238000012360 testing method Methods 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 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
- 239000012716 precipitator Substances 0.000 description 2
- 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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Abstract
The invention discloses a method for calculating a coal ash specific resistance, which comprises the following steps: 1. the coal ash component is tested according to the GB/T1574 coal ash component analysis method, and specifically comprises SiO 2 、Al 2 O 3 、Fe 2 O 3 、CaO、MgO、Na 2 O、K 2 O、TiO 2 、MnO 2 And SO 3 Is a component of (a); 2. calculating the silicon-aluminum component ratio RSiAl and the sum SSiAl of the silicon-aluminum components; 3. according to Al 2 O 3 The values of the components (RSiAl, SSiAl, caO) determine the highest value ρ of the specific resistance of the soot CAmj And its corresponding temperature, and calculates its specific value. The method can calculate the highest value of the coal ash specific resistance and the corresponding temperature of the coal sample according to the conventional ash component index of the coal quality, is simple, convenient and quick, and has high discrimination accuracy and higher engineering application value, and the research result is obtained by carrying out statistical analysis on a large number of laboratory test data. The fuel purchasing and coal blending combustion of the power plant can be guided, the adaptability of the coal to be fired and the electric dust remover is improved, the standard discharge of dust is facilitated, and the environment is protected.
Description
Technical Field
The invention relates to the technical field of coal ash specific resistance, in particular to a calculation method of coal ash specific resistance, which is applicable to anthracite, lean coal, bituminous coal and lignite.
Background
The specific resistance of coal ash is one of the key factors affecting the design of the electric precipitator and the efficiency of the electric precipitator, and the specific resistance of coal ash is usually measured when designing the boiler. 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 is basically not tested in actual operation of the power plant, and the specific resistance needs to be tested by a professional institution. 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 problematic, so that the difficulty is brought to the environment-friendly operation of the power plant.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for calculating the specific resistance of coal ash, which is applicable to anthracite, lean coal, bituminous coal and lignite.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a calculation method of coal ash specific resistance comprises the following steps:
the first step: the coal ash component is tested according to the GB/T1574 coal ash component analysis method, and specifically comprises SiO 2 、Al 2 O 3 、Fe 2 O 3 、CaO、MgO、Na 2 O、K 2 O、TiO 2 、MnO 2 And SO 3 The composition,%;
and a second step of: calculating the ratio of silicon to aluminum (RSiAl)/(Si to Al) and SSiAl (%) as shown in the formula (1) and the formula (2)
SSiAl＝SiO 2 +Al 2 O 3 (2)
And a third step of: according to Al 2 O 3 Calculating the highest value ρ of the specific resistance of the coal ash from the values of the components of (1), the silicon-aluminum component ratio RSiAl, the sum of the silicon-aluminum components SSiAl and CaO CAmj (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:
(1) if Al is 2 O 3 <25％，1.3≤RSiAl≤4.5，SSiAl<70%, the temperature corresponding to the highest value of the coal ash specific resistance is 150 ℃, and the highest value ρ of the corresponding coal ash specific resistance CAmj See formula (3).
ρ CAmj ＝(1.24×SSiAl-4.26×Al 2 O 3 -0.151×CaO-15.38×RSiAl+46)×10 11 (3)
If Al is 2 O 3 >40％，RSiAl≤1.3，SSiAl>80%, the temperature corresponding to the highest value of the coal ash specific resistance is 150 ℃, and the calculation formula of the highest value of the corresponding coal ash specific resistance is shown in formula (4).
ρ CAmj ＝(0.5×Al 2 O 3 +7.8×RSiAl+0.2×CaO-25)×10 13 (4)
(3) In the rest cases, the highest value of the specific resistance of the coal ash corresponds to 120 ℃ in temperature, and the calculation formula of the highest value of the specific resistance of the coal ash corresponds to (5)
ρ CAmj ＝(-0.13×SSiAl+0.48×Al 2 O 3 +3.8×RSiAl-0.09CaO-5.79)×10 12 (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 calculation method of coal ash specific resistance, which is applicable to anthracite, lean coal, bituminous coal and lignite.
The invention has the advantages that: (1) the highest value of the specific resistance of the coal ash and the corresponding temperature of the coal ash can be calculated according to the index of the conventional ash components of the coal quality, and the method is simple, convenient and quick. (2) The result is obtained by carrying out statistical analysis on a large number of laboratory test results, and has high calculation accuracy and higher engineering application value. (3) The fuel purchasing and coal blending combustion of the power plant can be guided, the adaptability of the coal to be 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-soot specific resistance prediction of sample 1
The present invention will be described in further detail with reference to examples.
The first step: testing the soot composition (specifically including SiO) according to the method for analyzing the soot composition of GB/T1574 2 、Al 2 O 3 、Fe 2 O 3 、CaO、MgO、Na 2 O、K 2 O、TiO 2 、MnO 2 And SO 3 Is a component of (c).
The test result of the coal ash component of the coal sample is as follows:
SiO 2 ＝30.88％、Al 2 O 3 ＝15.99％、Fe 2 O 3 ＝7.95％、CaO＝30.7％、MgO＝1.08％、Na 2 O＝0.44％、K 2 O＝0.85％、TiO 2 ＝0.76％、MnO 2 =0.35% and SO 3 ＝9.01％；
And a second step of: calculating the ratio of silicon to aluminum (RSiAl)/(Si to Al) and SSiAl (%) as shown in the formula (1) and the formula (2)
SSiAl＝SiO 2 +Al 2 O 3 (2)
The RSiAl (/) and SSiAl (%) of this coal sample were calculated as follows:
SSiAl＝SiO 2 +Al 2 O 3 ＝30.88+15.99＝46.87％
and a third step of: according to Al 2 O 3 Calculating the highest value ρ of the specific resistance of the coal ash from the values of the components of (1), the silicon-aluminum component ratio RSiAl, the sum of the silicon-aluminum components SSiAl and CaO CAmj (Ω·cm), and determining the highest temperature corresponding to the highest value of the specific resistance of the coal ash, the specific principle and the calculation method are as follows:
(1) if Al is 2 O 3 <25％，1.3≤RSiAl≤4.5，SSiAl<70%, the temperature corresponding to the highest value of the coal ash specific resistance is 150 ℃, and the highest value ρ of the corresponding coal ash specific resistance CAmj See formula (3).
ρ CAmj ＝(1.24×SSiAl-4.26×Al 2 O 3 -0.151×CaO-15.38×RSiAl+46)×10 11 (3)
(2) If Al is 2 O 3 >40％，RSiAl≤1.3，SSiAl>80%, the temperature corresponding to the highest value of the coal ash specific resistance is 150 ℃, and the calculation formula of the highest value of the corresponding coal ash specific resistance is shown in formula (4).
ρ CAmj ＝(0.5×Al 2 O 3 +7.8×RSiAl+0.2×CaO-25)×10 13 (4)
(3) In the rest cases, the temperature corresponding to the highest value of the coal ash specific resistance is 120 ℃, and the calculation formula corresponding to the highest value of the coal ash specific resistance is shown in formula (5)
ρ CAmj ＝(-0.13×SSiAl+0.48×Al 2 O 3 +3.8×RSiAl-0.09CaO-5.79)×10 12 (5)
Al of the coal sample 2 O 3 ＝15.99％<25％，1.3≤RSiAl＝1.93≤4.5，SSiAl＝46.87％<70, thus corresponds to the highest value ρ of the specific resistance of the coal ash CAmj See equation (3), and the highest specific resistance corresponds to a temperature of 150 ℃;
ρ CAmj ＝(1.24×SSiAl-4.26×Al 2 O 3 -0.151×CaO-15.38×RSiAl+46)×10 11
＝(1.24×46.87-4.26×15.99-0.151×30.7-15.38×1.93+46)×10 11
＝1.68×10 11
the following table shows laboratory test results, it can be seen that the specific resistance of the coal sample reaches the highest value at 150 ℃, and the corresponding specific resistance value is 1.25X10 11 The highest value of the specific resistance of the coal ash predicted by the invention is 1.68 multiplied by 10 11 The prediction result and the actual measurement result are very close, and the method has higher prediction precision.
Example 2-soot specific resistance prediction of sample 2
The present invention will be described in further detail with reference to examples.
The first step: testing the soot composition (specifically including SiO) according to the method for analyzing the soot composition of GB/T1574 2 、Al 2 O 3 、Fe 2 O 3 、CaO、MgO、Na 2 O、K 2 O、TiO 2 、MnO 2 And SO 3 Is a component of (c).
The test result of the coal ash component of the coal sample is as follows:
SiO 2 ＝43.60％、Al 2 O 3 ＝44.15％、Fe 2 O 3 ＝2.91％、CaO＝4.76％、MgO＝0.67％、Na 2 O＝0.01％、K 2 O＝0.76％、TiO 2 ＝0.47％、MnO 2 =0.04% and SO 3 ＝2.95％；
And a second step of: calculating the ratio of silicon to aluminum (RSiAl)/(Si to Al) and SSiAl (%) as shown in the formula (1) and the formula (2)
SSiAl＝SiO 2 +Al 2 O 3 (2)
The RSiAl (/) and SSiAl (%) of this coal sample were calculated as follows:
SSiAl＝SiO 2 +Al 2 O 3 ＝43.60+44.15＝87.75％
and a third step of: according to Al 2 O 3 Calculating the highest value ρ of the specific resistance of the coal ash from the values of the components of (1), the silicon-aluminum component ratio RSiAl, the sum of the silicon-aluminum components SSiAl and CaO CAmj (Ω·cm), and determining the highest temperature corresponding to the highest value of the specific resistance of the coal ash, the specific principle and the calculation method are as follows:
(1) if Al is 2 O 3 <25％，1.3≤RSiAl≤4.5，SSiAl<70%, the temperature corresponding to the highest value of the coal ash specific resistance is 150 ℃, and the highest value ρ of the corresponding coal ash specific resistance CAmj See formula (3).
ρ CAmj ＝(1.24×SSiAl-4.26×Al 2 O 3 -0.151×CaO-15.38×RSiAl+46)×10 11 (3)
(2) If Al is 2 O 3 >40％，RSiAl≤1.3，SSiAl>80%, the temperature corresponding to the highest value of the coal ash specific resistance is 150 ℃, and the calculation formula of the highest value of the corresponding coal ash specific resistance is shown in formula (4).
ρ CAmj ＝(0.5×Al 2 O 3 +7.8×RSiAl+0.2×CaO-25)×10 13 (4)
(3) In other cases, 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 formula (5)
ρ CAmj ＝(-0.13×SSiAl+0.48×Al 2 O 3 +3.8×RSiAl-0.09CaO-5.79)×10 12 (5)
Al of the coal sample 2 O 3 ＝44.15％>40％，RSiAl＝0.99≤1.3，SSiAl＝87.75>80%, which is the second case, thus corresponds to the highest specific resistance ρ CAmj Is of the meter(s)Calculating according to formula (4), wherein the corresponding temperature of the highest specific resistance is 150 ℃;
ρ CAmj ＝(0.5×Al 2 O 3 +7.8×RSiAl+0.2×CaO-25)×10 13
＝(0.5×44.15+7.8×0.99+0.2×4.76-25)×10 13
＝5.75×10 13
the following table shows laboratory test results, it can be seen that the specific resistance of the coal sample reaches the highest value at 150 ℃, and the corresponding specific resistance value is 6.45X10 13 The highest value of the coal ash specific resistance predicted by the invention is 5.75X10 13 The prediction result and the actual measurement result are very close, and the method has higher prediction precision.
Example 3-soot specific resistance prediction of sample 3
The present invention will be described in further detail with reference to examples.
The first step: testing the soot composition (specifically including SiO) according to the method for analyzing the soot composition of GB/T1574 2 、Al 2 O 3 、Fe 2 O 3 、CaO、MgO、Na 2 O、K 2 O、TiO 2 、MnO 2 And SO 3 Is a component of (c).
The test result of the coal ash component of the coal sample is as follows:
SiO 2 ＝50.91％、Al 2 O 3 ＝31.24％、Fe 2 O 3 ＝6.06％、CaO＝5.68％、MgO＝1.24％、Na 2 O＝0.64％、K 2 O＝1.32％、TiO 2 ＝1.08％、MnO 2 =0.074% and SO 3 ＝1.23％；
And a second step of: calculating the ratio of silicon to aluminum (RSiAl)/(Si to Al) and SSiAl (%) as shown in the formula (1) and the formula (2)
SSiAl＝SiO 2 +Al 2 O 3 (2)
The RSiAl (/) and SSiAl (%) of this coal sample were calculated as follows:
SSiAl＝SiO 2 +Al 2 O 3 ＝50.91+31.24＝82.15％
and a third step of: according to Al 2 O 3 Calculating the highest value ρ of the specific resistance of the coal ash from the values of the components of (1), the silicon-aluminum component ratio RSiAl, the sum of the silicon-aluminum components SSiAl and CaO CAmj (Ω·cm), and determining the highest temperature corresponding to the highest value of the specific resistance of the coal ash, the specific principle and the calculation method are as follows: :
(1) if Al is 2 O 3 <25％，1.3≤RSiAl≤4.5，SSiAl<70%, the temperature corresponding to the highest value of the coal ash specific resistance is 150 ℃, and the highest value ρ of the corresponding coal ash specific resistance CAmj See formula (3).
ρ CAmj ＝(1.24×SSiAl-4.26×Al 2 O 3 -0.151×CaO-15.38×RSiAl+46)×10 11 (3)
(2) If Al is 2 O 3 >40％，RSiAl≤1.3，SSiAl>80%, the temperature corresponding to the highest value of the coal ash specific resistance is 150 ℃, and the calculation formula of the highest value of the corresponding coal ash specific resistance is shown in formula (4).
ρ CAmj ＝(0.5×Al 2 O 3 +7.8×RSiAl+0.2×CaO-25)×10 13 (4)
(3) In the rest cases, the temperature corresponding to the highest value of the coal ash specific resistance is 120 ℃, and the calculation formula corresponding to the highest value of the coal ash specific resistance is shown in formula (5)
ρ CAmj ＝(-0.13×SSiAl+0.48×Al 2 O 3 +3.8×RSiAl-0.09CaO-5.79)×10 12 (5)
Al of the coal sample 2 O 3 ＝31.24％，RSiAl＝1.63Ssial=82.15%, which is the third case, and therefore corresponds to the highest value ρ of the soot specific resistance CAmj See formula (5), and the highest value of the specific resistance of the coal ash corresponds to a temperature of 120 ℃;
ρ CAmj ＝(-0.13×SSiAl+0.48×Al 2 O 3 +3.8×RSiAl-0.09CaO-5.79)×10 12
＝(-0.13×82.15+0.48×31.24+3.8×1.63-0.09×5.68-5.79)×10 12
＝4.21×10 12
the following table shows laboratory test results, it can be seen that the specific resistance of the coal sample reaches the highest value at 150 ℃, and the corresponding specific resistance value is 4.30X10 12 The highest value of the coal ash specific resistance predicted by the invention is 4.21 multiplied by 10 12 The prediction result and the actual measurement result are very close, and the method has higher prediction precision.
。
Claims (1)
1. A method for calculating the specific resistance of coal ash is characterized by comprising the following steps: the method comprises the following steps:
the first step: the coal ash component is tested according to the GB/T1574 coal ash component analysis method, and specifically comprises SiO 2 、Al 2 O 3 、Fe 2 O 3 、CaO、MgO、Na 2 O、K 2 O、TiO 2 、MnO 2 And SO 3 The unit is the components of (a);
and a second step of: calculating the silicon-aluminum component ratio RSiAl, and calculating the sum SSiAl of the silicon-aluminum components, wherein the unit is shown in the formula (1) and the formula (2)
SSiAl＝SiO 2 +Al 2 O 3 (2)
And a third step of: according to Al 2 O 3 Calculating the highest value ρ of the specific resistance of the coal ash from the values of the components of (1), the silicon-aluminum component ratio RSiAl, the sum of the silicon-aluminum components SSiAl and CaO CAmj The specific principle of the method is as follows:
(1) if Al is 2 O 3 <25％，1.3≤RSiAl≤4.5，SSiAl<70%, the temperature corresponding to the highest value of the coal ash specific resistance is 150 ℃, and the highest value ρ of the corresponding coal ash specific resistance CAmj See formula (3) for the calculation formula of (2)
ρ CAmj ＝(1.24×SSiAl-4.26×Al 2 O 3 -0.151×CaO-15.38×RSiAl+46)×10 11 (3)
(2) If Al is 2 O 3 >40％，RSiAl≤1.3，SSiAl>80%, the temperature corresponding to the highest value of the specific resistance of the coal ash is 150 ℃, and the calculation formula of the highest value of the specific resistance of the corresponding coal ash is shown in (4)
ρ CAmj ＝(0.5×Al 2 O 3 +7.8×RSiAl+0.2×CaO-25)×10 13 (4)
(3) In the rest cases, the highest value of the specific resistance of the coal ash corresponds to 120 ℃ in temperature, and the calculation formula of the highest value of the specific resistance of the coal ash corresponds to (5)
ρ CAmj ＝(-0.13×SSiAl+0.48×Al 2 O 3 +3.8×RSiAl-0.09CaO-5.79)×10 12 (equation 5).
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