CN109798537B - coal quality parameter control method for ensuring safe operation of eastern Junggar coal boiler - Google Patents
coal quality parameter control method for ensuring safe operation of eastern Junggar coal boiler Download PDFInfo
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Abstract
The invention discloses a coal quality parameter control method for ensuring safe operation of a east-west coal boiler, which is suitable for east-west coal boilers with good anti-slagging and anti-fouling performances, can well guide coal blending of the east-west coal boiler and blending of additives such as kaolin and the like, and improves the operation safety of the boilers, and comprises the following specific steps of 1, calculating the ash content of mixed coal entering the boiler according to the ash content, the ash content and the blending quality proportion of the blended coal, or testing and obtaining the ash content of the mixed coal entering the boiler according to a GB/T1574-2007 coal ash component analysis method, 2, calculating the basic oxide content HB, the acid oxide content HA, the alkali-acid ratio HB/A and the HB/A 2 O index of the mixed coal entering the boiler, 3, determining whether the mixed coal entering the boiler can ensure safe operation according to the following standards, 1) HNa 2 O is not more than or equal to 4%, 2) HFe 2 O 3 is not more than or equal to 10%, when HCaO is greater than 15%, 468%, 3) HCaO is not more than 3), 3) HB/HB is not more than 7.25%, and Na 598.5.598).
Description
Technical Field
the invention relates to the technical field of safe operation of pulverized coal boilers, in particular to a coal quality parameter control method for ensuring safe operation of a eastern Junggar coal boiler, which is suitable for the eastern Junggar coal boiler which is designed and put into operation recently and has good slag and dirt resistance, and can be used for blending of fire coal of the eastern Junggar coal boiler or blending of fire coal and kaolin and the like.
Background
Compared with other serious slagging coal types in China, the eastern Junggar coal ash has high content of alkaline oxides such as Na 2 O, CaO and MgO, and low content of acidic oxides such as SiO 2 and Al 2 O 3, so that the problems of serious slagging of a hearth and serious contamination of a convection heating surface easily occur when the eastern Junggar coal is used for boiler combustion.
The research results of Lijiali et al show that B/A and Na 2 O indexes jointly influence the contamination performance of coal ash, and Li Junjie et al show that the contamination inner layer of the eastern Junggar coal has obvious enrichment of Na 2 SO 4 and CaSO 4. Caipegqing tests the contamination performance of the sodium-removed eastern Junggar coal in a laboratory to obtain that the contamination performance of the eastern Junggar coal can be greatly reduced by lower Na 2 O content, but the 100% combustion of the eastern Junggar coal can not be ensured by higher contents of alkali metals such as Fe 2 O 3 and CaO in the coal ash.
The research results of Cao Bei Qing through the slag formation performance test after the site Dong coal is mixed with kaolin with different components are basically consistent with the test results of Li Yu Sheng in a laboratory, and the research results also suggest that Al 2 O 3 is controlled in a reasonable range.
The eastern Junggar coal boiler designed at present adopts strict measures of preventing slag and contamination, such as enlarging a boiler hearth, namely selecting smaller hearth heat load parameters, enough soot blowers, enlarging convection heating surface tube spacing and the like, and the adaptability of the boiler to the eastern Junggar coal is enhanced to a certain extent. However, whether the eastern Junggar coal boiler with excellent slag and dirt resistance can completely burn eastern Junggar coal or control key coal quality indexes of blended coal entering a furnace after blending combustion is not specified yet.
Disclosure of Invention
in order to overcome the defects in the prior art, the invention aims to provide a coal quality parameter control method for ensuring the safe operation of a newly designed eastern Junggar coal boiler with excellent slagging resistance and stain resistance, and the influence of the slagging resistance and the stain resistance of the eastern Junggar coal on the safe operation of the boiler is cooperatively considered, so that the key coal quality index control value of the coal mixing in the boiler for ensuring the safe operation of the eastern Junggar coal unit is obtained.
In order to achieve the purpose, the invention adopts the following technical scheme:
A coal quality parameter control method for ensuring the safe operation of a eastern Junggar coal boiler is suitable for the newly designed eastern Junggar coal boiler with excellent slagging resistance and stain resistance, and specifically comprises the following steps:
the method comprises the following steps of firstly, calculating the ash content of the mixed coal entering a furnace through the ash content, the ash component content and the mixed burning mass ratio of the mixed coal entering the furnace, or testing the ash content of the mixed coal entering the furnace according to the GB/T1574-2007 coal ash component analysis method, wherein the ash components comprise SiO 2, Al 2 O 3, Fe 2 O 3, CaO, MgO, Na 2 O, K 2 O and TiO 2;
The method for calculating the content of different ash components in the mixed coal entering the furnace comprises the following steps:
HY＝(R1*Y1*Aar1+R2*Y2*Aar2+.。。。+Ri*Yi*Aari)/(R1*Aar1+R2*Aar2+.。。。+Ri*Aari)
HY represents the content of certain ash component in eight ash components of SiO 2, Al 2 O 3, Fe 2 O 3, CaO, MgO, Na 2 O, K 2 O and TiO 2 of the mixed coal entering the furnace, namely HSiO 2 and HAl 2 O 3 respectively represent the content of SiO 2 and Al 2 O 3 of the mixed coal entering the furnace, and the like;
R i represents the mass ratio of blended coal type i to the total blended coal type%
A ari represents the ash content of the blended coal type i%
Y i represents a certain ash content,%, of the blended coal type i.
Secondly, calculating indexes of alkaline oxide content HB, acidic oxide content HA, alkaline-to-acid ratio HB/A and HB/A Na 2 O of the fed mixed coal;
Wherein HB is HFe 2 O 3 + HCaO + HMgO + HNa 2 O + HK 2 O%
HA＝HSiO2+HAl2O3+HTiO2％
HB/A＝HB/HA
HB/A*Na2O＝HB/A×HNa2O
A third step; whether the coal mixture entering the furnace can ensure the safe operation of the boiler is determined according to the following standards, and the following 6 regulations are simultaneously met:
(1)HNa2O≤4％
(2) HFe 2 O 3 is less than or equal to 10 percent, when HCaO is more than 15 percent, HFe 2 O 3 is less than or equal to 8 percent
(3)HCaO≤25％
(4)HB≤36％
(5)HB/A≤0.8
(6)HB/A*Na2O≤2.3％。
The east Junggar coal boiler with excellent anti-slagging and anti-fouling performances controls the coal mixing quality of the boiler according to the requirements, and the following table shows the basic requirements of boilers with the capacity grades of 360MW and 660 MW.
compared with the prior art, the invention has the following advantages:
1) The method is characterized in that the method comprises the steps of obtaining Na 2 O content in coal ash as a monitoring index for ensuring safe operation of a boiler according to the operation practice of a medium-small capacity power station boiler which burns east coal in a peripheral area of Wu-Maoqi, wherein the index is too level, the influence of other ash components on the slagging and contamination performance of the east coal is not fully considered, the guidance of a newly designed east coal boiler group with excellent slagging and contamination performance is poorer, and the improvement of the adaptability of the newly designed east coal to the design of the unit is not fully considered.
2) the invention innovatively provides that a plurality of indexes such as Na 2 O, Fe 2 O 3, CaO, alkali metal oxide content B and alkali-acid ratio B/A, B/A Na 2 O for controlling the type of coal entering a furnace jointly guarantee the safe operation of the east-oriented coal unit.
3) The invention comprehensively considers the improvement of the adaptability of the newly designed eastern Junggar coal boiler with excellent slagging resistance and dirt resistance to eastern Junggar coal, so that the Na 2 O content in the coal ash is improved to 4 percent.
4) the invention reserves the influence of the combined ash component index on the safe operation of the east coal unit, gives a clear control value, considers the influence of different alkaline ash components on the slagging and the contamination performance of the east coal boiler, and provides a patent that small indexes such as Fe 2 O 3, CaO and the like are controlled in a corresponding range.
5) The invention ensures the safe operation of the east-west coal unit through the single small index and the combined index control.
Detailed Description
The present invention will be described in more detail with reference to the following embodiments.
Example 1: whether 100% Tianchi energy coal can be fully burned on the newly designed east-Junggar coal boiler with 360MW and 660MW capacity levels
The method comprises the first step of calculating the ash content of the mixed coal entering the furnace through the ash content, the ash component content and the mixed burning mass ratio of the mixed coal entering the furnace, or testing the ash content of the mixed coal entering the furnace according to a GB/T1574-2007 coal ash component analysis method, wherein the ash components specifically comprise SiO 2, Al 2 O 3, Fe 2 O 3, CaO, MgO, Na 2 O, K 2 O and TiO 2.
In this embodiment, ash component indexes of the coal ash mixed in the furnace are obtained by testing according to a GB/T1574-2007 coal ash component analysis method, and specifically include (SiO 2, Al 2 O 3, Fe 2 O 3, CaO, MgO, Na 2 O, K 2 O, TiO 2);
the coal as fired in the embodiment is a single coal type of the Tianchi energy coal, and the ash component test result is as follows:
SiO21＝13.54％、Al2O31＝14.79％、Fe2O31＝5.68％、CaO1＝32.74％、MgO1＝3.59％、Na2O1＝4.63％、K2O1＝0.70％、TiO21＝1.13％
secondly, calculating indexes of alkaline oxide content HB, acidic oxide content HA, alkaline-to-acid ratio HB/A and HB/A Na 2 O of the fed mixed coal;
Wherein HB is HFe 2 O 3 + HCaO + HMgO + HNa 2 O + HK 2 O%
HA＝HSiO2+HAl2O3+HTiO2％
HB/A＝HB/HA
HB/A*Na2O＝HB/A×HNa2O
The coal as fired is of a single coal type, so that
HSiO2＝SiO21＝13.54％、HAl2O3＝Al2O31＝14.79％、HFe2O3＝Fe2O31＝5.68％、HCaO＝CaO1＝32.74％、HMgO＝MgO1＝3.59％、HNa2O＝Na2O1＝4.63％、HK2O＝K2O1＝0.70％、HTiO2＝TiO21＝1.13％
The calculation results of the Tianchi energy coal in this example are as follows
HB＝HFe2O3+HCaO+HMgO+HNa2O+HK2O＝5.68％+32.74％+3.59％+4.63％+0.70％＝47.34％
HA＝HSiO2+HAl2O3+HTiO2＝13.54％+14.79％+1.13％＝29.46％
HB/A＝HB/HA＝47.34％/29.46％＝1.61
HB/A*Na2O＝HB/A×HNa2O＝1.61×4.63％＝7.45％。
A third step; whether the coal mixture fed into the boiler can ensure the safe operation of the boiler is determined according to the following standard, and the following 6 regulations are met at the same time.
(1)HNa2O≤4％
(2) HFe 2 O 3 is less than or equal to 10 percent, when HCaO is more than 15 percent, HFe 2 O 3 is less than or equal to 8 percent
(3)HCaO≤25％
(4)HB≤36％
(5)HB/A≤0.8
(6)HB/A*Na2O≤2.3％。
for the energy coal of the day tank, five conditions (1), (3), (4), (5) and (6) are not met, so that the requirement of safe combustion cannot be met.
Example 2: whether 90% Tianchi energy coal and 10% alkali ditch coal can be fully burned on the newly designed east-Junggar coal boiler with the capacity level of 360MW and 660MW
The method comprises the first step of calculating the ash content of the mixed coal entering the furnace through the ash content, the ash component content and the mixed burning mass ratio of the mixed coal entering the furnace, or testing the ash content of the mixed coal entering the furnace according to a GB/T1574-2007 coal ash component analysis method, wherein the ash components specifically comprise SiO 2, Al 2 O 3, Fe 2 O 3, CaO, MgO, Na 2 O, K 2 O and TiO 2.
The method for calculating the content of different ash components in the mixed coal entering the furnace comprises the following steps:
HY＝(R1*Y1*Aar1+R2*Y2*Aar2+.。。。+Ri*Yi*Aari)/(R1*Aar1+R2*Aar2+.。。。+Ri*Aari)
HY represents the content of certain ash component in eight ash components of SiO 2, Al 2 O 3, Fe 2 O 3, CaO, MgO, Na 2 O, K 2 O and TiO 2 of the mixed coal,%, such as HSiO 2 and HAl 2 O 3 respectively represent the content of SiO 2 and Al 2 O 3 of the mixed coal entering the furnace,%, and so on;
R i represents the mass ratio of blended coal type i to the total blended coal type%
a ari represents the ash content of the blended coal type i%
y i represents a certain ash content,%, of the blended coal type i.
The coal mixture fed into the furnace consists of 90 mass percent of blended coal 1 day pool energy coal and 10 mass percent of blended coal 2 alkali ditch coal, wherein R 1 is 0.9, and R 2 is 0.1;
The ash component test results of the pool energy coal of 1 day of the blended coal of this example are as follows:
SiO21＝13.54％、Al2O31＝14.79％、Fe2O31＝5.68％、CaO1＝32.74％、MgO1＝3.59％、Na2O1＝4.63％、K2O1＝0.70％、TiO21＝1.13％
the ash component test results of the 2-alkali ditch coal blended with the burned coal of the embodiment are as follows:
SiO22＝57.00％、Al2O32＝22.70％、Fe2O32＝5.78％、CaO2＝4.14％、MgO2＝2.19％、Na2O2＝0.58％、K2O2＝1.54％、TiO22＝1.02％
the ash content of the Tianchi energy coal and the alkali ditch coal in the embodiment is 3.28 percent and 17.26 percent respectively
Obtaining ash component data of the coal mixed in the furnace according to a calculation method of the components of the coal mixed in the furnace, wherein the specific calculation result is as follows:
HSiO2＝(R1×SiO21×Aar1+R2×SiO22×Aar2)/(R1×Aar1+R2×Aar2)＝(0.9×13.54×3.28+0.1×57.00×17.26)/(0.9×3.28+0.1×17.26)＝29.58％
HAl2O3＝(R1×Al2O31×Aar1+R2×Al2O32×Aar2)/(R1×Aar1+R2×Aar2)＝(0.9×14.79×3.28+0.1×22.70×17.26)/(0.9×3.28+0.1×17.26)＝17.71％
HFe2O3＝(R1×Fe2O31×Aar1+R2×Fe2O32×Aar2)/(R1×Aar1+R2×Aar2)＝(0.9×5.68×3.28+0.1×5.78×17.26)/(0.9×3.28+0.1×17.26)＝5.72％
HCaO＝(R1×CaO1×Aar1+R2×CaO2×Aar2)/(R1×Aar1+R2×Aar2)＝(0.9×32.74×3.28+0.1×4.14×17.26)/(0.9×3.28+0.1×17.26)＝22.19％
HMgO＝(R1×MgO1×Aar1+R2×MgO2×Aar2)/(R1×Aar1+R2×Aar2)＝(0.9×3.59×3.28+0.1×2.19×17.26)/(0.9×3.28+0.1×17.26)＝3.07％
HNa2O＝(R1×Na2O1×Aar1+R2×Na2O2×Aar2)/(R1×Aar1+R2×Aar2)＝(0.9×4.63×3.28+0.1×0.58×17.26)/(0.9×3.28+0.1×17.26)＝3.14％
HK2O＝(R1×K2O1×Aar1+R2×K2O2×Aar2)/(R1×Aar1+R2×Aar2)＝(0.9×0.70×3.28+0.1×1.54×17.26)/(0.9×3.28+0.1×17.26)＝1.01％
HTiO2＝(R1×TiO21×Aar1+R2×TiO22×Aar2)/(R1×Aar1+R2×Aar2)＝(0.9×1.13×3.28+0.1×1.02×17.26)/(0.9×3.28+0.1×17.26)＝1.09％
Secondly, calculating indexes of alkaline oxide content HB, acidic oxide content HA, alkaline-to-acid ratio HB/A and HB/A Na 2 O of the fed mixed coal;
Wherein HB is HFe 2 O 3 + HCaO + HMgO + HNa 2 O + HK 2 O%
HA＝HSiO2+HAl2O3+HTiO2％
HB/A＝HB/HA
HB/A*Na2O＝HB/A×HNa2O％
In this example, the result of the calculation of the coal mixture of the melting coal of 90% by mass of the Tianchi energy coal and 10% by mass of the alkali ditch coal is as follows:
HB＝HFe2O3+HCaO+HMgO+HNa2O+HK2O＝5.72％+22.19％+3.07％+3.14％+1.01％＝35.13％
HA＝SiO2+Al2O3+TiO2＝29.58％+17.71％+1.09％＝48.38％
HB/A＝35.13％/48.38％＝0.73
HB/A*Na2O＝B/A×Na2O＝0.73×3.14％＝2.29％
A third step; whether the coal mixture entering the furnace can ensure the safe operation of the boiler is determined according to the following standard, and meanwhile, the following 6 specified requirements are met.
(1)HNa2O≤4％
(2) HFe 2 O 3 is less than or equal to 10 percent, when HCaO is more than 15 percent, HFe 2 O 3 is less than or equal to 8 percent
(3)HCaO≤25％
(4)HB≤36％
(5)HB/A≤0.8
(6)HB/A*Na2O≤2.3。
In the present example, the ash content and the related index of the coal mixture in the furnace of 90 mass% of the Tianchi energy coal and 10 mass% of the alkali ditch coal satisfy all six of the above-mentioned (1), (2), (3), (4), (5) and (6), and therefore, the safe combustion requirement is satisfied.
Example 3: whether 90% Tianchi energy coal + 10% kaolin can be fully fired on the newly designed eastern Junggar coal boiler with 360MW and 660MW capacity levels
the method comprises the first step of calculating the ash content of the mixed coal entering the furnace through the ash content, the ash component content and the mixed burning mass ratio of the mixed coal entering the furnace, or testing the ash content of the mixed coal entering the furnace according to a GB/T1574-2007 coal ash component analysis method, wherein the ash components specifically comprise SiO 2, Al 2 O 3, Fe 2 O 3, CaO, MgO, Na 2 O, K 2 O and TiO 2.
the method for calculating the contents of different ash components in the mixed coal entering the furnace comprises the following steps:
HY＝(R1*Y1*Aar1+R2*Y2*Aar2+.。。。+Ri*Yi*Aari)/(R1*Aar1+R2*Aar2+.。。。+Ri*Aari)
HY represents the content of certain ash component in eight ash components of SiO 2, Al 2 O 3, Fe 2 O 3, CaO, MgO, Na 2 O, K 2 O and TiO 2 of the mixed coal,%, such as HSiO 2 and HAl 2 O 3 respectively represent the content of SiO 2 and Al 2 O 3 of the mixed coal entering the furnace,%, and so on;
R i represents the mass ratio of blended coal type i to the total blended coal type%
a ari represents the ash content of the blended coal type i%
y i represents a certain ash content,%, of the blended coal type i.
In this example, the coal mixture fed into the furnace is composed of 90% by mass of coal of 1 day pool energy and 10% by mass of coal of 2 days kaolin, where R 1 is 0.9 and R 2 is 0.1;
the ash component test results of the pool energy coal of 1 day of the blended coal of this example are as follows:
SiO21＝13.54％、Al2O31＝14.79％、Fe2O31＝5.68％、CaO1＝32.74％、MgO1＝3.59％、Na2O1＝4.63％、K2O1＝0.70％、TiO21＝1.13％
The ash content test results of the 2 kaolin coal of the blended coal of the embodiment are as follows:
SiO22＝53.36％、Al2O32＝41.74％、Fe2O32＝1.20％、CaO2＝1.26％、MgO2＝0.1％、Na2O2＝0.25％、K2O2＝0.48％、TiO22＝0.69％
The ash contents of the Tianchi energy coal and the kaolin in the example were 3.28% and 100%, respectively.
obtaining ash component data of the coal mixed in the furnace according to the calculation method of the coal mixed in the furnace
HSiO2＝(R1×SiO21×Aar1+R2×SiO22×Aar2)/(R1×Aar1+R2×Aar2)＝(0.9×13.54×3.28+0.1×53.36×100)/(0.9×3.28+0.1×100)＝44.28％
HAl2O3＝(R1×Al2O31×Aar1+R2×Al2O32×Aar2)/(R1×Aar1+R2×Aar2)＝(0.9×14.79×3.28+0.1×41.74×100)/(0.9×3.28+0.1×100)＝35.60％
HFe2O3＝(R1×Fe2O31×Aar1+R2×Fe2O32×Aar2)/(R1×Aar1+R2×Aar2)＝(0.9×5.68×3.28+0.1×1.20×100)/(0.9×3.28+0.1×100)＝2.22％
HCaO＝(R1×CaO1×Aar1+R2×CaO2×Aar2)/(R1×Aar1+R2×Aar2)＝(0.9×32.74×3.28+0.1×1.26×100)/(0.9×3.28+0.1×100)＝8.43％
HMgO＝(R1×MgO1×Aar1+R2×MgO2×Aar2)/(R1×Aar1+R2×Aar2)＝(0.9×3.59×3.28+0.1×0.1×100)/(0.9×3.28+0.1×100)＝0.90％
HNa2O＝(R1×Na2O1×Aar1+R2×Na2O2×Aar2)/(R1×Aar1+R2×Aar2)＝(0.9×4.63×3.28+0.1×0.25×100)/(0.9×3.28+0.1×100)＝1.25％
HK2O＝(R1×K2O1×Aar1+R2×K2O2×Aar2)/(R1×Aar1+R2×Aar2)＝(0.9×0.70×3.28+0.1×0.48×100)/(0.9×3.28+0.1×100)＝0.53％
HTiO2＝(R1×TiO21×Aar1+R2×TiO22×Aar2)/(R1×Aar1+R2×Aar2)＝(0.9×1.13×3.28+0.1×0.69×100)/(0.9×3.28+0.1×100)＝0.79％
Secondly, calculating indexes of alkaline oxide content HB, acidic oxide content HA, alkaline-to-acid ratio HB/A and HB/A Na 2 O of the fed mixed coal;
Wherein HB is HFe 2 O 3 + HCaO + HMgO + HNa 2 O + HK 2 O%
HA＝HSiO2+HAl2O3+HTiO2％
HB/A＝HB/HA
HB/A*Na2O＝HB/A×HNa2O％
In this example, the results of the calculation of the charged coal mixture of 90% by mass of Tianchi-source coal and 10% by mass of kaolin are as follows
HB＝HFe2O3+HCaO+HMgO+HNa2O+HK2O＝2.22％+8.43％+0.90％+1.25％+0.53％＝13.33％
HA＝HSiO2+HAl2O3+HTiO2＝44.28％+35.60％+0.79％＝80.67％
HB/A＝HB/HA＝13.33％/80.67％＝0.17
HB/A*Na2O＝HB/A×HNa2O＝0.17×1.25％＝0.21％
a third step; whether the coal mixture entering the furnace can ensure the safe operation of the boiler is determined according to the following standard, and meanwhile, the following 6 specified requirements are met.
(1)HNa2O≤4％
(2) HFe 2 O 3 is less than or equal to 10 percent, when HCaO is more than 15 percent, HFe 2 O 3 is less than or equal to 8 percent
(3)HCaO≤25％
(4)HB≤36％
(5)HB/A≤0.8
(6)HB/A*Na2O≤2.3％。
in this example, the ash content and the index of the coal mixture in the furnace of 90 mass% of the Tianchi energy coal and 10 mass% of the kaolin satisfy all six of the above-mentioned values (1), (2), (3), (4), (5) and (6), and therefore, the safe combustion requirement is satisfied.
Claims (2)
1. A coal quality parameter control method for ensuring the safe operation of a eastern Junggar coal boiler is characterized by comprising the following steps: the method is suitable for the east China coal boiler with excellent slagging resistance and dirt resistance, and specifically comprises the following steps:
The method comprises the following steps of firstly, calculating the ash content of the mixed coal entering a furnace through the ash content, the ash component content and the mixed burning mass ratio of the mixed coal entering the furnace, or testing the ash content of the mixed coal entering the furnace according to the GB/T1574-2007 coal ash component analysis method, wherein the ash components comprise SiO 2, Al 2 O 3, Fe 2 O 3, CaO, MgO, Na 2 O, K 2 O and TiO 2;
The method for calculating the content of different ash components in the mixed coal entering the furnace comprises the following steps:
HY＝(R1*Y1*Aar1+R2*Y2*Aar2+…+Ri*Yi*Aari)/(R1*Aar1+R2*Aar2+…+Ri*Aari)
HY represents the content of certain ash component in eight ash components of SiO 2, Al 2 O 3, Fe 2 O 3, CaO, MgO, Na 2 O, K 2 O and TiO 2 of the mixed coal entering the furnace, namely HSiO 2 and HAl 2 O 3 respectively represent the content of SiO 2 and Al 2 O 3 of the mixed coal entering the furnace, and the like;
R i represents the mass ratio of blended coal type i to the total blended coal type%
a ari represents the ash content of the blended coal type i%
Y i represents a certain ash content of the blended coal type i%
secondly, calculating indexes of alkaline oxide content HB, acidic oxide content HA, alkaline-to-acid ratio HB/A and HB/A Na 2 O of the fed mixed coal;
Wherein HB is HFe 2 O 3 + HCaO + HMgO + HNa 2 O + HK 2 O%
HA＝HSiO2+HAl2O3+HTiO2％
HB/A＝HB/HA
HB/A*Na2O＝HB/A×HNa2O
A third step; whether the coal mixture entering the furnace can ensure the safe operation of the boiler is determined according to the following standards, and the following 6 regulations are simultaneously met:
(1)HNa2O≤4％
(2) HFe 2 O 3 is less than or equal to 10 percent, when HCaO is more than 15 percent, HFe 2 O 3 is less than or equal to 8 percent
(3)HCaO≤25％
(4)HB≤36％
(5)HB/A≤0.8
(6)HB/A*Na2O≤2.3％。
2. the coal quality parameter control method for ensuring the safe operation of the eastern Junggar coal boiler as claimed in claim 1, wherein: the basic requirements of the boilers with the capacity grades of 360MW and 660MW in the eastern Junggar coal boiler with excellent anti-slagging and anti-fouling performances are shown in the following table:
Priority Applications (1)
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| CN112923394A (en) * | 2021-04-09 | 2021-06-08 | 西安热工研究院有限公司 | Coal-fired boiler high-temperature convection heating surface contamination and slagging early warning system and method |
| CN113806935B (en) * | 2021-09-16 | 2024-03-12 | 西安热工研究院有限公司 | Calculation method of coal ash specific resistance |
| CN114046525B (en) * | 2021-11-04 | 2024-07-12 | 新疆中泰矿冶有限公司 | Method and device for relieving slag formation of eastern mixed coal by blending and sintering ash |
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