CN117128533A - Method for determining blending combustion proportion of blast furnace gas of coal-fired power plant boiler - Google Patents
Method for determining blending combustion proportion of blast furnace gas of coal-fired power plant boiler Download PDFInfo
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- CN117128533A CN117128533A CN202310792800.0A CN202310792800A CN117128533A CN 117128533 A CN117128533 A CN 117128533A CN 202310792800 A CN202310792800 A CN 202310792800A CN 117128533 A CN117128533 A CN 117128533A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 44
- 238000002156 mixing Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000007789 gas Substances 0.000 claims abstract description 112
- 239000003245 coal Substances 0.000 claims abstract description 63
- 239000000446 fuel Substances 0.000 claims abstract description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 239000010881 fly ash Substances 0.000 claims abstract description 11
- 239000002893 slag Substances 0.000 claims abstract description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 9
- 239000001301 oxygen Substances 0.000 claims abstract description 9
- 239000000779 smoke Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 29
- 239000003546 flue gas Substances 0.000 claims description 29
- 239000002956 ash Substances 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/002—Regulating fuel supply using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
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- Mathematical Physics (AREA)
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- Mathematical Optimization (AREA)
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- Algebra (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention discloses a method for determining the blending combustion proportion of blast furnace gas of a coal-fired power plant boiler, which comprises the steps of firstly, assuming the mass ratio z of the blast furnace gas to the actual coal to be burnt, and obtaining the dry basis oxygen content and the dry basis CO of the existing operation smoke by the input characteristic parameters of the blast furnace gas, the characteristic data of the blast furnace gas, the carbon content of fly ash, the carbon content of slag and the dry basis CO of the existing operation smoke 2 Volumetric fraction and dry basis CO volumetric fraction for CO 2 Equilibrium calculation by CO 2 The balance iteration calculation is carried out to obtain the actual mass ratio z value of the blast furnace gas entering the furnace and the actual coal burned, and the mass ratio l of the unburned combustible material and the supplied fuel is combined u And determining the final blast furnace gas blending combustion proportion. The invention can determine the blending combustion proportion of the blast furnace gas of the boiler of the coal-fired power plant so as to meet the thermal state operation requirement of the coal-fired power plant, improve the economic operation level of the unit and simultaneously addAnd the accurate supervision of the blending combustion proportion of the blast furnace gas is strong.
Description
Technical field:
the invention belongs toThe technical field of coal-fired power generation, in particular to a method for determining the blending combustion proportion of blast furnace gas of a boiler of a coal-fired power plant. The method is realized by carrying out CO on the coal-fired boiler 2 Balance calculation, taking into account CO in air 2 The content, the existing thermodynamic parameter, coal quality and blast furnace gas characteristic data and the fly ash and slag carbon content are utilized to obtain the blending combustion proportion of the blast furnace gas in the mixed fuel on line.
The background technology is as follows:
for coal and electricity enterprises, as the price of coal is high, the profit margin of the coal and electricity enterprises is smaller and smaller, and the power generation cost is controlled more and more strictly. In order to reduce the enterprise cost, more and more coal enterprises begin to comprehensively utilize resources and perform inferior fuel blending combustion. Steel enterprise self-contained power plants are also subject to operating pressures that increase fuel costs. A large amount of blast furnace gas can be generated in the production process of iron and steel enterprises, and many iron and steel enterprises directly discharge the part of blast furnace gas without utilization. However, the direct discharge of blast furnace gas having a certain heat energy value as exhaust gas is a waste of resources. Therefore, the self-contained power plants of part of iron and steel enterprises recycle the part of low-grade resources in a blast furnace gas blending combustion mode. The blending ratio of the inferior fuel is not easy to determine, and the economic operation of the unit can be influenced. Therefore, it is important to accurately determine the blending ratio of inferior fuels including blast furnace gas in operation.
The invention comprises the following steps:
the invention aims to overcome the defects of the prior art, and provides a method for determining the blending combustion proportion of blast furnace gas of a coal-fired power plant boiler so as to improve the utilization rate of the blast furnace gas and enhance the supervision effect of the use of the blast furnace gas.
The invention adopts the following technical scheme:
the invention provides a method for determining the blending combustion proportion of blast furnace gas of a coal-fired power plant boiler, which comprises the following steps:
s1, setting the mass ratio of blast furnace gas fed into a furnace to actual coal burned is z;
s2, calculating the theoretical dry flue gas volume V generated by burning unit mass coal God1 Volume of dry flue gas V Gd1 The method comprises the steps of carrying out a first treatment on the surface of the Calculating unit mass blast furnace gas combustionTheoretical dry flue gas volume V generated God2 Volume of dry flue gas V Gd2 ；
S3, calculating the volume V of dry flue gas generated by burning the coal corresponding to the unit mass coal and the blast furnace gas mixed fuel according to the z value Gd The method comprises the steps of carrying out a first treatment on the surface of the (coal-to-blast furnace gas mixed fuel per unit mass coal = unit mass coal + blast furnace gas of corresponding mass calculated as z);
s4, calculating theoretical CO generated by burning unit mass coal 2 Quality ofWith actual CO 2 Quality->Calculating theoretical CO generated by unit-mass blast furnace gas combustion 2 Quality->With actual CO 2 Quality->
S5, calculating actual CO generated by burning the coal corresponding to the unit mass coal and the blast furnace gas mixed fuel according to the z value 2 Quality of
S6, according to V Gd Andcalculating CO in dry flue gas generated by burning coal and blast furnace gas mixed fuel 2 The volume fraction occupied->
S7, measuring and obtaining dry basis CO in actually obtained flue gas 2 Volume fractionVolume fraction y with dry CO COd ；
S8, willy COd Sum and->Comparing, if the deviation is too large, resetting z until the difference between the two is reduced to the target value;
s9, calculating the mass ratio l of the unburned combustible material to the supplied fuel u Through l u The value is compared with the z value set in S8, and the blending combustion mass ratio x of the blast furnace gas is calculated gas And heat ratio q gas 。
Further, in the step S2,
V God1 ＝0.01(8.893C ar +20.9724H ar +3.319S ar -2.6424O ar +0.7997N ar )；
wherein C is ar 、H ar 、O ar 、N ar And S is ar The raw coal receives a base carbon component, a base hydrogen component, a base oxygen component, a base nitrogen component and a base sulfur component respectively; x is x CO 、And->Respectively CO and CO in blast furnace gas 2 、N 2 、H 2 、CH 4 、O 2 And H 2 Mass fraction of S; />Is the dry oxygen content of the smoke exhaust.
Further, in S3, V Gd ＝V Gd1 +z·V Gd2 。
Further, in the step S4,
wherein,is dry air CO of unit mass 2 The mass content is as follows.
Further, in the step S5,
further, in the step S6,
further, in S8, the z value satisfies:
further, in the step S9,
wherein u is FA 、u SL Is the carbon content of fly ash and slag, eta FA 、η SL Fly ash rate and slag rate; a is that ar And W is ar The raw coal receives base ash and full moisture respectively; v is the volatile content of the received base ash; q (Q) coal,net,ar kJ/kg is the lower calorific value of the coal fed into the furnace; q (Q) gas,net,ar Is the low-position heat value of blast furnace gas, kJ/kg.
The invention has the beneficial effects that:
the invention carries out CO on the coal-fired boiler 2 Balance calculation, taking into account CO in air 2 Content of CO 2 Balance calculation, namely, the blending combustion proportion of the blast furnace gas in the mixed fuel is obtained on line by utilizing the existing thermodynamic parameter, coal quality and blast furnace gas characteristic data, the fly ash carbon content and the slag carbon content, so that the accurate and reliable supervision of the blending combustion proportion of the blast furnace gas is ensured, and the safe and economic operation level of the coal-fired boiler is improved.
Description of the drawings:
FIG. 1 is an overall flow chart of the present invention;
FIG. 2 is a flow chart of the blast furnace gas blending combustion ratio calculation in the invention.
The specific embodiment is as follows:
for the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The embodiment of the invention provides a method for determining the blending combustion proportion of blast furnace gas of a coal-fired power plant boiler, which comprises the following steps:
1. setting the mass ratio of the blast furnace gas fed into the furnace to the actual coal burned off as z;
2. calculating the theoretical dry flue gas volume V generated by burning unit mass coal God1 Volume of dry flue gas V Gd1 The method comprises the steps of carrying out a first treatment on the surface of the Calculating the theoretical dry flue gas volume V generated by unit mass blast furnace gas combustion God2 Volume of dry flue gas V Gd2 The method specifically comprises the following steps:
(1) Determination of blast furnace gas density ρ n ：
Wherein ρ is n Is the density of blast furnace gas, kg/m 3 ；y CO 、Is the components of the blast furnace gas, namely CO and CO 2 、N 2 、H 2 、CH 4 、O 2 、H 2 O、H 2 S volume fraction,%; ρ as.g Is the ash concentration of blast furnace gas, g/m 3 。
(2) Calculating mass fractions and heat values of each component of the blast furnace gas:
the mass fraction of CO in the blast furnace gas,%;
blast furnace gas CO 2 Mass fraction,%;
blast furnace gas N 2 Mass fraction,%;
blast furnace gas H 2 Mass fraction,%;
blast furnace gas CH 4 Mass fraction,%;
blast furnace gas O 2 Mass fraction,%;
blast furnace gas H 2 O mass fraction,%;
blast furnace gas H 2 S mass fraction,%;
mass fraction of blast furnace gas ash,%;
Q gas,net,ar low calorific value of blast furnace gas, kJ/kg;
(3) Calculating the theoretical dry flue gas volume generated by burning coal and blast furnace gas:
theoretical dry flue gas volume V generated by burning unit mass coal God1 ，Nm 3 /kg：
V God1 ＝0.01(8.893C ar +20.9724H ar +3.319S ar -2.6424O ar +0.7997N ar )
Wherein C is ar 、H ar 、O ar 、N ar 、S ar The raw coal receives the base carbon fraction, the base hydrogen fraction, the base oxygen fraction, the base nitrogen fraction and the base sulfur fraction,%.
Theoretical dry flue gas volume V generated by unit mass blast furnace gas combustion God2 ，Nm 3 /kg：
(4) Calculating the volume of dry flue gas generated by burning coal and blast furnace gas:
dry flue gas volume V generated by combustion of coal of unit mass Gd1 ，Nm 3 /kg：
Volume V of dry flue gas generated by unit mass blast furnace gas combustion Gd2 ，Nm 3 /kg：
In the method, in the process of the invention,is the dry oxygen content of the smoke exhaust,%.
3. According to the z value, calculating the volume V of dry flue gas generated by burning the coal corresponding to the unit mass coal and the blast furnace gas mixed fuel Gd ，Nm 3 Kg, in particular:
V Gd ＝V Gd1 +z·V Gd2 ；
wherein z is the mass ratio of the blast furnace gas fed into the furnace to the actual coal burned, and is dimensionless.
4. Calculating theoretical CO generated by burning unit mass coal 2 Quality ofWith actual CO 2 Quality->Calculating theoretical CO generated by unit-mass blast furnace gas combustion 2 Quality->And actualCO 2 Quality->The method comprises the following steps:
theoretical CO generated by burning unit mass coal 2 Quality ofkg/kg：
Theoretical CO generated by unit-mass blast furnace gas combustion 2 Quality ofkg/kg：
Actual CO generated by burning unit mass of coal 2 Quality ofkg/kg：
Actual CO generated by unit mass blast furnace gas combustion 2 Quality ofkg/kg：
Wherein,is dry air CO of unit mass 2 Content, kg/kg, value 0.000505kg/kg.
5. Calculating the unit mass coal pair according to the z valueTheoretical CO generated by burning mixed fuel of coal and blast furnace gas 2 Quality ofAnd actual CO 2 Quality->The method comprises the following steps:
theoretical CO generated by burning coal corresponding to unit mass coal and blast furnace gas mixed fuel 2 Quality ofkg/kg：
Actual CO generated by burning coal corresponding to unit mass coal and blast furnace gas mixed fuel 2 Quality ofkg/kg：
6. According to V Gd Andcalculating CO in dry flue gas generated by burning coal and blast furnace gas mixed fuel 2 The volume fraction occupied->％：
7. Determining the mass ratio z of the final blast furnace gas fed into the furnace to the actual coal burned off:
firstly, assuming the mass ratio z of blast furnace gas fed into the furnace to actual coal burned, calculating CO in dry flue gas 2 The volume fraction ofAnd then measuring dry basis CO in the obtained flue gas 2 Volume fraction->Volume fraction y with dry CO COd Comparing the sum, if the deviation is too large, re-assuming z until the difference between the two is reduced to meet the target +.>Until that point.
8. Calculating the mass ratio l of unburned combustible to supplied fuel u Through l u Calculating the blending combustion proportion x of blast furnace gas according to the value and the z value set in the step seven gas And heat ratio q gas ：
(1) Calculating the mass ratio l of unburned combustible to supplied fuel u ：
Wherein, I u The mass ratio of the unburned combustible matters to the supplied fuel is dimensionless; u (u) FA 、u SL The carbon content of fly ash and slag,%,. Eta FA 、η SL The fly ash rate and slag rate,%; a is that ar And W is ar The raw coal receives base ash and full moisture,%.
(2) Calculating the mass ratio x of blast furnace gas to mixed fuel gas And heat ratio q gas ，％。
In which Q coal,net,ar And receiving the low-grade heat value of the coal fed into the furnace, and kJ/kg.
Example 1 the results of the calculations are shown in the accompanying Table I
Table-attached example of blast furnace gas blending combustion proportion calculation
The invention discloses a method for determining the blending combustion proportion of blast furnace gas of a coal-fired power plant boiler. The data acquisition module acquires the characteristic parameters of the coal quality of the entering furnace, the characteristic data of the blast furnace gas, the carbon content of fly ash, the carbon content of slag, the dry basis oxygen content of the existing operation smoke exhaust and the dry basis CO 2 Volume fraction and dry basis CO volume fraction. The calculation module uses CO 2 Balance calculation of dry smoke quantity generated by fuel combustion and generation of dry-base CO in flue gas 2 And determining the volume fraction and the blending combustion proportion of the blast furnace gas. The output module outputs the real-time blast furnace gas mixing and burning proportion. The invention firstly assumes the mass ratio z of the blast furnace gas to the actual coal to be burned, and the input blast furnace gas quality characteristic parameters, blast furnace gas characteristic data, fly ash carbon content, slag carbon content, the dry basis oxygen content of the existing operation smoke and dry basis CO 2 Volumetric fraction and dry basis CO volumetric fraction for CO 2 Equilibrium calculation by CO 2 The balance iteration calculation is carried out to obtain the actual mass ratio z value of the blast furnace gas entering the furnace and the actual coal burned, and the mass ratio l of the unburned combustible material and the supplied fuel is combined u And determining the final blast furnace gas blending combustion proportion. The invention can determine the blending combustion proportion of the blast furnace gas of the boiler of the coal-fired power plant so as to meet the thermal state operation requirement of the coal-fired power plant, improve the economic operation level of a unit and strengthen the accurate supervision of the blending combustion proportion of the blast furnace gas.
The foregoing is merely a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, but all technical solutions falling under the concept of the present invention fall within the scope of the present invention, and it should be noted that, for those skilled in the art, several modifications and adaptations without departing from the principles of the present invention should and are intended to be regarded as the scope of the present invention.
Claims (8)
1. The method for determining the blending combustion proportion of the blast furnace gas of the coal-fired power plant boiler is characterized by comprising the following steps of:
s1, setting the mass ratio of blast furnace gas fed into a furnace to actual coal burned is z;
s2, calculating the theoretical dry flue gas volume V generated by burning unit mass coal God1 Volume of dry flue gas V Gd1 The method comprises the steps of carrying out a first treatment on the surface of the Calculating the theoretical dry flue gas volume V generated by unit mass blast furnace gas combustion God2 Volume of dry flue gas V Gd2 ；
S3, calculating the volume V of dry flue gas generated by burning the coal corresponding to the unit mass coal and the blast furnace gas mixed fuel according to the z value Gd ；
S4, calculating theoretical CO generated by burning unit mass coal 2 Quality ofWith actual CO 2 Quality->Calculating theoretical CO generated by unit-mass blast furnace gas combustion 2 Quality->With actual CO 2 Quality->
S5, calculating actual CO generated by burning the coal corresponding to the unit mass coal and the blast furnace gas mixed fuel according to the z value 2 Quality of
S6, according to V Gd Andcalculating CO in dry flue gas generated by burning coal and blast furnace gas mixed fuel 2 The volume fraction of
S7, measuring and obtaining dry-base CO in flue gas actually generated by burning coal and blast furnace gas mixed fuel 2 Volume fractionVolume fraction y with dry CO COd ；
S8, willy COd Sum and->Comparing, if the deviation is too large, resetting z until the difference between the two is reduced to the target value;
s9, calculating the mass ratio l of the unburned combustible material to the supplied fuel u Through l u The value is compared with the z value set in S8, and the blending combustion mass ratio x of the blast furnace gas is calculated gas And heat ratio q gas 。
2. The method for determining the blending combustion proportion of the blast furnace gas of the coal-fired power plant boiler according to claim 1, wherein,
in the step S2 of the above-mentioned method,
V God1 ＝0.01(8.893C ar +20.9724H ar +3.319S ar -2.6424O ar +0.7997N ar )；
wherein C is ar 、H ar 、O ar 、N ar And S is ar The raw coal receives a base carbon component, a base hydrogen component, a base oxygen component, a base nitrogen component and a base sulfur component respectively; x is x CO 、And->Respectively CO and CO in blast furnace gas 2 、N 2 、H 2 、CH 4 、O 2 And H 2 Mass fraction of S;
is the dry oxygen content of the smoke exhaust.
3. The method for determining the blending combustion proportion of the blast furnace gas of the coal-fired power plant boiler according to claim 1, wherein,
in the step S3, a step of, in the above-mentioned step,
V Gd ＝V Gd1 +z·V Gd2 。
4. the method for determining the blending combustion proportion of the blast furnace gas of the coal-fired power plant boiler according to claim 1, wherein,
in the step S4 of the above-mentioned method,
wherein,is CO in dry air of unit mass 2 Quality.
5. The method for determining the blending combustion proportion of the blast furnace gas of the coal-fired power plant boiler according to claim 1, wherein,
in the step S5 of the above-mentioned method,
6. the method for determining the blending combustion proportion of the blast furnace gas of the coal-fired power plant boiler according to claim 1, wherein,
in the step S6 described above, the step of,
7. the method for determining the blending combustion proportion of the blast furnace gas of the coal-fired power plant boiler according to claim 6, wherein,
in S8, the z value satisfies:
8. the method for determining the blending combustion proportion of the blast furnace gas of the coal-fired power plant boiler according to claim 1, wherein,
in the step S9 described above, the step of,
wherein u is FA 、u SL Is the carbon content of fly ash and slag, eta FA 、η SL Fly ash rate and slag rate; a is that ar And W is ar The raw coal receives base ash and full moisture respectively; v is the volatile content of the received base ash; q (Q) coal,net,ar For low heat value of coal into furnace, Q gas,net,ar Is the low-position heat value of blast furnace gas.
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