CN117286292A - Fuel ratio control method for coping with fluctuation of blast furnace gas utilization rate - Google Patents
Fuel ratio control method for coping with fluctuation of blast furnace gas utilization rate Download PDFInfo
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- CN117286292A CN117286292A CN202311181104.2A CN202311181104A CN117286292A CN 117286292 A CN117286292 A CN 117286292A CN 202311181104 A CN202311181104 A CN 202311181104A CN 117286292 A CN117286292 A CN 117286292A
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- 239000000446 fuel Substances 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 50
- 230000010485 coping Effects 0.000 title claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 98
- 229910052742 iron Inorganic materials 0.000 claims abstract description 49
- 239000003245 coal Substances 0.000 claims description 16
- 239000000571 coke Substances 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 238000003306 harvesting Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052710 silicon Inorganic materials 0.000 abstract description 3
- 239000010703 silicon Substances 0.000 abstract description 3
- 230000002159 abnormal effect Effects 0.000 abstract 1
- 238000009529 body temperature measurement Methods 0.000 abstract 1
- 238000011084 recovery Methods 0.000 abstract 1
- 230000033764 rhythmic process Effects 0.000 abstract 1
- 238000003723 Smelting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 description 2
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
- G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
- G05D11/139—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring a value related to the quantity of the individual components and sensing at least one property of the mixture
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to a method for determining fuel ratio when the gas utilization rate fluctuates under the working condition of a blast furnace, which considers the change characteristics of main operation parameters in the actual operation of the production of the blast furnace, and can accurately reflect the fuel ratio adjustment quantity when the gas utilization rate changes under different states, thereby ensuring the stability of the silicon content of molten iron and the temperature measurement of molten iron of the blast furnace, fully utilizing the silicon content of the molten iron in the daily heat system operation of the blast furnace, providing basis for recovering the working condition of the blast furnace when the gas flow of the blast furnace is abnormal and the gas utilization rate fluctuates greatly, and playing roles of reducing operation errors and accelerating the recovery rhythm.
Description
Technical Field
The invention relates to the field of ferrous metallurgy blast furnace production, in particular to a fuel ratio control method for coping with fluctuation of blast furnace gas utilization rate.
Background
The invention provides a control method for adjusting the fuel ratio when the gas utilization rate of the blast furnace fluctuates under the working condition by utilizing parameters such as the heat system level, the fuel ratio control value, the gas utilization rate and the like under the working condition of the blast furnace and according to the reduction principle of main elements such as iron, silicon, manganese and the like in the blast furnace and combining the influence value of the gas utilization rate on the fuel ratio when the gas utilization rate changes under the actual working condition.
The invention aims at: the invention relates to a method for adjusting fuel ratio under the fluctuation of the working condition and the gas utilization rate of a blast furnace, which can be used for stabilizing the operation of a heat system of the blast furnace, and can determine a reasonable fuel ratio control value when the gas utilization rate and the furnace condition of the blast furnace change greatly, thereby ensuring the stability of the heat system and the smooth running of the blast furnace.
Disclosure of Invention
The present invention has been made in view of the above problems, and an object of the present invention is to provide a fuel ratio control method that is responsive to fluctuations in the utilization rate of blast furnace gas.
The purpose of the invention is realized in the following way: a fuel ratio control method for coping with fluctuation of blast furnace gas utilization rate includes the following steps: step one: calculation of ton iron fuel ratio FR 8 hours before the current collection point Datum And average value eta CO of blast furnace gas utilization rate within 8 hours before the current collection point Datum Ton iron fuel ratio FR 8 hours before the current harvest point Datum =cr+pci/(p×ch) ×1000, where CR is the average value of the coke ratio 8 hours before the current collection point, in kg/ton, PCI is the total amount of coal injection 8 hours before the current collection point, in ton, P is the amount of iron per batch, in ton, ch is the total number of batches discharged from the current collection point for 8 hours; eta CO Datum Is at presentThe average value of the blast furnace gas utilization rate within 8 hours before the collection point is shown in the unit; step two: calculating the average value eta CO of the blast furnace gas utilization rate of the current collection point in the first 1 hour Recent times Calculating a metering difference delta eta CO=eta CO of the blast furnace gas utilization rate of each collecting point Datum -ηCO Recent times ，ηCO Datum Is the average value of the utilization rate of the blast furnace gas in 8 hours before the acquisition point, eta CO Recent times Is equal to eta CO Datum The average value of the blast furnace gas utilization rate within 1 hour before the same collection point is shown in the unit; step three: the absolute value of the metering difference of the utilization rate of the blast furnace gas at the current collection point is smaller than 0.3, namely |delta eta CO| is smaller than 0.3, and the control value FR=FR of the current ton iron fuel ratio of the blast furnace Datum Step four is entered when |Δηco| is equal to or greater than 0.3; step four: the absolute value of the metering difference value of the current collection point blast furnace gas utilization rate is smaller than 1, namely |delta eta CO| is smaller than 1, and the current ton iron fuel ratio control value FR=FR standard+ (eta 2CO standard-eta 3CO recent) eta 0A eta 10.5 of the blast furnace; step five is entered when the current acquisition point |delta eta 4CO| is greater than or equal to 1; step five: the absolute value of the metering difference value of the current collection point blast furnace gas utilization rate is smaller than 2, namely |delta eta 5CO| is smaller than 2, and the current ton iron fuel ratio control value FR=FR benchmark+ (eta 8CO benchmark-eta 9CO recent) eta 6A eta 70.75 of the blast furnace; step six is entered when the current acquisition point |delta eta CO| is more than or equal to 2; step six: the absolute value of the metering difference value of the current collection point blast furnace gas utilization rate is smaller than 3, namely |delta eta 0CO| is smaller than 3, and the current ton iron fuel ratio control value FR=FR benchmark+ (eta CO benchmark-eta CO recent) ×A×1 of the blast furnace; step seven is entered when the current acquisition point |delta eta CO| is more than or equal to 3; step seven: the absolute value of the metering difference value of the utilization rate of the blast furnace gas at the current collection point is more than or equal to 3, namely |delta eta CO| is more than or equal to 3, and the control value FR=FR reference+ (eta CO) of the current ton iron fuel ratio of the blast furnace Datum -ηCO Recent times ) X a x 1.3; step eight: and (5) fuel is added according to the current ton iron fuel ratio control value FR of the blast furnace, so that the heat system of the blast furnace is stabilized.
The coke ratio, the coal injection amount per hour, the blanking speed and the blast furnace gas utilization rate under the blast furnace working condition are collected in real time, namely, the coke ratio, the coal injection amount per hour, the blanking speed and the blast furnace gas utilization rate are collected once every 10-60 minutes.
In the first step, the utilization rate of blast furnace gas is 8 hours before the current timeMean value eta CO Datum The method is characterized in that the method is an arithmetic average value of the blast furnace gas utilization rate in 8 hours before the current time, the unit is taken, and the average value of the blast furnace gas utilization rate in 8 hours before any collecting point in the second step is an arithmetic average value of the blast furnace gas utilization rate in 8 hours before the collecting point, and the unit is taken as%.
Average value eta CO of blast furnace gas utilization rate of the first 1 hour of the current time in the second step Recent times Is the arithmetic average value of the utilization rate of blast furnace gas in 1 hour before the current time, eta CO Recent times Is equal to eta CO Datum The same acquisition point is given in units of%.
When FR is the same as Datum A is 5.5 when < 500kg/t, and is less than or equal to FR when 500kg/t Datum A is 6 when 520kg/t is less than 520kg/t and FR when 520kg/t is less than or equal to FR Datum A is 6.5 when < 550kg/t, when 550kg/t is +. Datum A is 7.5 when FR is less than 580kg/t Datum And A is 10 when the weight is more than or equal to 580 kg/t.
The beneficial effects of the invention are as follows: (1) And quantifying a fuel ratio control value after fluctuation of the utilization rate of the blast furnace gas. (2) When the furnace condition fluctuates and the gas utilization rate changes greatly, the fuel ratio adjustment amount is determined, the blast furnace heat system is stabilized, and the quality of molten iron is ensured.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a graph of the gas utilization fluctuation 1% combustion ratio adjustment amount at different base fuel ratios of the present invention.
In the graph, the X axis is ton iron fuel ratio (unit: kg/t), and the Y axis is fuel ratio adjustment amount corresponding to 1% change of gas utilization rate.
Detailed Description
The change of the utilization rate of the blast furnace gas is one of important evaluation basis for the change of the heat system of the reaction blast furnace, the utilization rate of the blast furnace gas reflects the utilization efficiency of the burning heat value of carbon in the blast furnace, the influence on the heat system of the blast furnace is large, and the fluctuation of the utilization rate of the gas in a short time is large, so that the large change of the heat system of the blast furnace is often caused, and the quality of molten iron is influenced. When the gas utilization rate is greatly changed in daily operation of the blast furnace, the fuel ratio of the blast furnace needs to be adjusted in time, so that the stability of the heat system of the blast furnace is realized, the stable and smooth operation of the blast furnace is ensured, the quality of molten iron is ensured, and the method has a positive effect on the aspect of the production operation of the blast furnace.
The method for stabilizing the blast furnace heat system by the fluctuation of the blast furnace gas utilization rate is researched and quantified by researching the influence of the fluctuation of the blast furnace gas utilization rate on the blast furnace heat system, a Rist operation line is utilized, relevant fuel ratio control data is obtained by combining production actual conditions, reasonable adjustment amounts of the fuel ratios when the gas utilization rate fluctuates to different intervals are given, the data analysis method and the actual production are utilized for correction, and finally, the control method of the fuel ratios when the gas utilization rate fluctuates under working conditions is formed.
At present, the control means of the fuel ratio when the utilization rate of the blast furnace gas fluctuates is mainly based on experience, no clear method and no unified standard exist, for example, the utilization rate of the blast furnace gas is reduced by 1%, the adjustment quantity of the fuel ratio of most enterprises is 4-6kg/t, the adjustment quantity of the fuel ratio of the enterprises is 6-8kg/t, in actual production, the influence on the heat system when the utilization rate of the blast furnace gas fluctuates in different fuel ratio ranges is different, the RIST operation line and the actual production condition return to each fluctuation 1% under different gas utilization rates, and the adjustment value of the combustion ratio is shown in figure 1.
It can be seen from fig. 1 that the higher the basic fuel ratio of the blast furnace, the lower the fuel ratio before the fluctuation of the gas utilization, the less the fuel ratio is correspondingly adjusted per 1% fluctuation of the gas utilization, which corresponds to the lower the fuel ratio, and the lower the carbon-carbon requirement in the smelting process. The traditional method has poor usability and accuracy in actual production, and the basic fuel ratio cannot effectively control the blast furnace heat system when fluctuating in different areas, which is a main problem to be solved by the invention.
Under the actual smelting condition of the blast furnace, the blast furnace heat system is realized by the ton iron fuel ratio, and the fuel ratio can be calculated by the coke ratio, the hour coal amount and the hour coal injection amount.
The technical problems to be solved by the invention are as follows: how to obtain control value calculation formulas of fuel ratios of different blast furnace gas utilization rate change regions according to a heat balance principle and actual production conditions by using the blast furnace gas utilization rate change values and the corresponding ton iron base fuel ratio, and finally determining ton iron fuel ratio control values after fluctuation of the blast furnace gas utilization rate.
1. The technical scheme adopted by the invention is as follows: a method for controlling the fuel ratio of the fluctuation of the utilization rate of blast furnace gas includes such steps as real-time collecting the coke ratio, coal injection quantity per hour, iron quantity per batch, batch number and utilization rate of blast furnace gas, and 8 hr running.
Step one, calculating the ton iron fuel ratio FR 8 hours before the current collection point Datum And average value eta CO of blast furnace gas utilization rate within 8 hours before the current collection point Datum Ton iron fuel ratio FR 8 hours before the current harvest point Datum =cr+pci/(p×ch) ×1000, where CR is the average value of the coke ratio 8 hours before the current collection point, in kg/ton, PCI is the total amount of coal injection 8 hours before the current collection point, in ton, P is the amount of iron per batch, in ton, ch is the total number of batches discharged from the current collection point for 8 hours; eta CO Datum The average value of the blast furnace gas utilization rate in the 8 hours before the current collection point is expressed as%.
Step two, calculating the average value eta CO of the blast furnace gas utilization rate of the current collection point in the first 1 hour Recent times Calculating a metering difference delta eta CO=eta CO of the blast furnace gas utilization rate of each collecting point Datum -ηCO Recent times ，ηCO Datum Is the average value of the utilization rate of the blast furnace gas in 8 hours before the acquisition point, eta CO Recent times Is equal to eta CO Datum The average value of the blast furnace gas utilization rate in the 1 hour before the same collection point is expressed as%.
Step three, the absolute value of the metering difference value of the current collection point blast furnace gas utilization rate is smaller than 0.3, namely |delta eta CO| is smaller than 0.3, and the current ton iron fuel ratio control value fr=fr of the blast furnace Datum Step four is entered when |Δηco| is equal to or greater than 0.3.
Step four, the absolute value of the metering difference value of the current collection point blast furnace gas utilization rate is smaller than 1, namely |delta eta CO| is smaller than 1, and the current ton iron fuel ratio control value FR=FR standard+ (eta CO standard-eta CO recent) ×A×0.5 of the blast furnace; step five is entered when the current acquisition point |Δηco| is equal to or greater than 1.
Fifthly, the absolute value of the metering difference value of the current collection point blast furnace gas utilization rate is smaller than 2, namely |delta eta CO| is smaller than 2, and the current ton iron fuel ratio control value FR=FR standard+ (eta CO standard-eta CO recent) ×A×0.75 of the blast furnace; and (3) when the current acquisition point |delta eta CO| is more than or equal to 2, entering a step (six).
Step six, the absolute value of the metering difference value of the current collection point blast furnace gas utilization rate is smaller than 3, namely |delta eta CO| is smaller than 3, and the current ton iron fuel ratio control value FR=FR benchmark+ (eta CO benchmark-eta CO recent) ×A×1 of the blast furnace; step seven is entered when the current acquisition point |Δηco| is 3 or more.
Step seven, the absolute value of the metering difference value of the current collection point blast furnace gas utilization rate is more than or equal to 3, namely |delta eta CO| is more than or equal to 3, and the control value FR=FR reference+ (eta CO) of the current ton iron fuel ratio of the blast furnace is obtained Datum -ηCO Recent times )×A×1.3。
And step eight, fuel is added according to the current ton iron fuel ratio control value FR of the blast furnace, and the heat system of the blast furnace is stabilized.
2. The real-time collection of the coke ratio, the coal injection amount per hour, the blanking speed and the blast furnace gas utilization rate under the blast furnace working condition means that the coke ratio, the coal injection amount per hour and the blanking speed are collected once every 10-60 minutes.
3. In the first step, the average value eta CO of the utilization rate of the blast furnace gas in 8 hours before the current time Datum The method is characterized in that the method is an arithmetic average value of the blast furnace gas utilization rate in 8 hours before the current time, the unit is taken, and in the second step, the average value of the blast furnace gas utilization rate in 8 hours before any one acquisition point is an arithmetic average value of the blast furnace gas utilization rate in 8 hours before the acquisition point, and the unit is taken as%.
4. In the second step, the average value eta CO of the blast furnace gas utilization rate of the first 1 hour of the current time Recent times Is the arithmetic average value of the utilization rate of blast furnace gas in 1 hour before the current time, eta CO Recent times Is equal to eta CO Datum The same acquisition point is given in units of%.
5. When FR is the same as Datum A is 5.5 when < 500kg/t, and is less than or equal to FR when 500kg/t Datum A is 6 when 520kg/t is less than 520kg/t and FR when 520kg/t is less than or equal to FR Datum A is 6.5 when < 550kg/t, when 550kg/t is +. Datum A is 7.5 when FR is less than 580kg/t Datum And A is 10 when the weight is more than or equal to 580 kg/t.
The following examples further illustrate embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples.
Firstly, a reference example is introduced, wherein the reference example adopts a traditional measuring and calculating method at present, namely a control method for stabilizing the furnace temperature after the fluctuation of the utilization rate of blast furnace gas is determined according to traditional experience.
Reference examples
Under three different known working conditions, the method is used for adjusting the utilization rate of the blast furnace gas by 1% according to the traditional method, and the fuel ratio is adjusted to 6kg/t, wherein the first working condition is a normal furnace condition, the second working condition and the third working condition are furnace conditions with larger fluctuation of the utilization rate of the blast furnace gas, and the furnace temperature levels of the blast furnace under different working conditions after the traditional method are shown in a table 1.
Table 1: benchmark instance results
After the gas utilization rate is changed, the fuel ratio control value FR (working condition one) =495+ (51-50) ×6= 500.4kg/t.
After the gas utilization rate is changed, the fuel ratio control value FR (working condition two) =503+ (49.2-47.6) ×6=512.6 kg/t.
After the gas utilization rate is changed, the fuel ratio control value FR (working condition three) =522+ (47.3-43.8) ×6=543 kg/t.
From comparison of three working conditions, when the reference fuel ratio is low and the fluctuation of the blast furnace gas utilization rate is small, the furnace temperature control is easy to be higher when the adjustment is carried out according to the traditional method, but when the reference fuel ratio is high and the fluctuation of the blast furnace gas utilization rate is large, the furnace temperature control is easy to be lower when the adjustment is carried out according to the traditional method.
The following describes an embodiment of the present invention, and the furnace temperature control method is mainly based on the method of the present invention when the blast furnace gas utilization rate fluctuates.
It can be seen from fig. 1 that the higher the basic fuel ratio of the blast furnace, the lower the fuel ratio before the fluctuation of the gas utilization, the less the fuel ratio is correspondingly adjusted per 1% fluctuation of the gas utilization, which corresponds to the lower the fuel ratio, and the lower the carbon-carbon requirement in the smelting process. The traditional method has poor usability and accuracy in actual production, and the basic fuel ratio cannot effectively control the blast furnace heat system when fluctuating in different areas, which is a main problem to be solved by the invention.
Description of the preferred embodiments
A method for controlling the fuel ratio of the fluctuation of the utilization rate of blast furnace gas, which is characterized in that after the blast furnace is operated, the coke ratio, the coal injection quantity per hour, the iron quantity per batch, the batch number and the utilization rate of blast furnace gas under the condition of the blast furnace are collected in real time every 10 minutes, and after the blast furnace is operated for 8 hours, the fuel ratio control for the fluctuation of the utilization rate of blast furnace gas is carried out according to the following steps.
Step one, calculating the ton iron fuel ratio FR 8 hours before the current collection point Datum And average value eta CO of blast furnace gas utilization rate within 8 hours before the current collection point Datum Ton iron fuel ratio FR 8 hours before the current harvest point Datum =cr+pci/(p×ch) ×1000, where CR is the average value of the coke ratio 8 hours before the current collection point, in kg/ton, PCI is the total amount of coal injection 8 hours before the current collection point, in ton, P is the amount of iron per batch, in ton, ch is the total number of batches discharged from the current collection point for 8 hours; eta CO Datum The average value of the blast furnace gas utilization rate in the 8 hours before the current collection point is expressed as%.
Step two, calculating the average value eta CO of the blast furnace gas utilization rate of the current collection point in the first 1 hour Recent times Calculating a metering difference delta eta CO=eta CO of the blast furnace gas utilization rate of each collecting point Datum -ηCO Recent times ，ηCO Datum Is the average value of the utilization rate of the blast furnace gas in 8 hours before the acquisition point, eta CO Recent times Is equal to eta CO Datum The average value of the blast furnace gas utilization rate in the 1 hour before the same collection point is expressed as%.
Step three, the absolute value of the metering difference value of the current collection point blast furnace gas utilization rate is smaller than 0.3, namely |delta eta CO| is smaller than 0.3, and the current ton iron fuel ratio control value fr=fr of the blast furnace Datum Step four is entered when |Δηco| is equal to or greater than 0.3.
Step four, the absolute value of the metering difference value of the current collection point blast furnace gas utilization rate is smaller than 1, namely |delta eta CO| is smaller than 1, and the current ton iron fuel ratio control value FR=FR standard+ (eta CO standard-eta CO recent) ×A×0.5 of the blast furnace; step five is entered when the current acquisition point |Δηco| is equal to or greater than 1.
Fifthly, the absolute value of the metering difference value of the current collection point blast furnace gas utilization rate is smaller than 2, namely |delta eta CO| is smaller than 2, and the current ton iron fuel ratio control value FR=FR standard+ (eta CO standard-eta CO recent) ×A×0.75 of the blast furnace; and (3) when the current acquisition point |delta eta CO| is more than or equal to 2, entering a step (six).
Step six, the absolute value of the metering difference value of the current collection point blast furnace gas utilization rate is smaller than 3, namely |delta eta CO| is smaller than 3, and the current ton iron fuel ratio control value FR=FR benchmark+ (eta CO benchmark-eta CO recent) ×A×1 of the blast furnace; step seven is entered when the current acquisition point |delta eta CO| is more than or equal to 3;
step seven, the absolute value of the metering difference value of the current collection point blast furnace gas utilization rate is more than or equal to 3, namely |delta eta CO| is more than or equal to 3, and the control value FR=FR reference+ (eta CO) of the current ton iron fuel ratio of the blast furnace is obtained Datum -ηCO Recent times )×A×1.3。
And step eight, fuel is added according to the current ton iron fuel ratio control value FR of the blast furnace, and the heat system of the blast furnace is stabilized.
2. The real-time collection of the coke ratio, the coal injection amount per hour, the blanking speed and the blast furnace gas utilization rate under the blast furnace working condition means that the coke ratio, the coal injection amount per hour and the blanking speed are collected once every 10-60 minutes.
3. In the first step, the average value eta CO of the utilization rate of the blast furnace gas in 8 hours before the current time Datum The method is characterized in that the method is an arithmetic average value of the blast furnace gas utilization rate in 8 hours before the current time, the unit is taken, and in the second step, the average value of the blast furnace gas utilization rate in 8 hours before any one acquisition point is an arithmetic average value of the blast furnace gas utilization rate in 8 hours before the acquisition point, and the unit is taken as%.
4. In the second step, the average value eta CO of the blast furnace gas utilization rate of the first 1 hour of the current time Recent times Arithmetic of blast furnace gas utilization rate within 1 hour before current timeAverage value, eta CO Recent times Is equal to eta CO Datum The same acquisition point is given in units of%.
5. When FR is the same as Datum A is 5.5 when < 500kg/t, and is less than or equal to FR when 500kg/t Datum A is 6 when 520kg/t is less than 520kg/t and FR when 520kg/t is less than or equal to FR Datum A is 6.5 when < 550kg/t, when 550kg/t is +. Datum A is 7.5 when FR is less than 580kg/t Datum And A is 10 when the weight is more than or equal to 580 kg/t.
TABLE 2 correspondence between fuel ratio conversion coefficient and reference fuel ratio
| FR reference | ＜500 | 500～520 | 520～550 | 550～580 | ＞580 |
| 5.5 | 6 | 6.5 | 7.5 | 10 |
Under three different working conditions, the method of the invention adjusts the gas utilization rate of the blast furnace by 1%, and according to the steps in the technical scheme of the invention, the fuel ratio control quantity corresponding to the immediate value of the fluctuation of the gas utilization rate under the blast furnace condition is calculated so as to realize the stability of a heat system, and compared with the adjustment result of the traditional method in the reference implementation case, and the specific result is shown in Table 3.
Table 3 example results
Working condition one has an A value of 5.5 and a B value of 0.5; working condition II A value 6 and working condition B value 0.75; the working condition three A value is 6.5, and the B value is 1.3.
After the gas utilization rate is changed, the fuel ratio control value FR (working condition one) =496+ (50.9-50.2) ×5.5x0.5= 497.9kg/t.
After the gas utilization rate is changed, the fuel ratio control value FR (working condition two) =502+ (49.3-47.7) ×6×0.75=509.2 kg/t.
After the gas utilization rate is changed, the fuel ratio control value FR (working condition three) =524+ (47.2-43.1) ×6.5x1.3= 558.6kg/t.
By comparing with the traditional control method, the traditional control method has poor furnace temperature control effect when the utilization rate of the blast furnace gas greatly fluctuates, when the utilization rate of the blast furnace gas is reduced from 47.3% to 43.8%, the reduction amplitude of the furnace temperature reaches 0.27%, and when the utilization rate of the blast furnace gas is reduced from 47.2% to 43.1%, the furnace temperature is basically kept stable by using the control method of the invention.
As can be seen from comparison of results, the traditional method has poor furnace temperature control effect when the utilization rate of blast furnace gas greatly fluctuates, and the method has better furnace temperature control effect and higher practicability compared with the traditional method.
The above embodiments are merely examples of the present invention, but the present invention is not limited to the above embodiments, and any changes or modifications within the scope of the present invention are intended to be included in the scope of the present invention.
Claims (5)
1. A fuel ratio control method for coping with fluctuation of blast furnace gas utilization rate is characterized in that: the method comprises the following steps:
step one: calculation of ton iron fuel ratio FR 8 hours before the current collection point Datum And average value eta CO of blast furnace gas utilization rate within 8 hours before the current collection point Datum Ton iron fuel ratio FR 8 hours before the current harvest point Datum =cr+pci/(p×ch) ×1000, where CR is the average value of the coke ratio 8 hours before the current collection point, in kg/ton, PCI is the total amount of coal injection 8 hours before the current collection point, in ton, P is the amount of iron per batch, in ton, ch is the total number of batches discharged from the current collection point for 8 hours; eta CO Datum The unit is the average value of the utilization rate of blast furnace gas in 8 hours before the current collection point;
step two: calculating the average value eta CO of the blast furnace gas utilization rate of the current collection point in the first 1 hour Recent times Calculating a metering difference delta eta CO=eta CO of the blast furnace gas utilization rate of each collecting point Datum -ηCO Recent times ，ηCO Datum Is the average value of the utilization rate of the blast furnace gas in 8 hours before the acquisition point, eta CO Recent times Is equal to eta CO Datum The average value of the blast furnace gas utilization rate within 1 hour before the same collection point is shown in the unit;
step three: the absolute value of the metering difference of the utilization rate of the blast furnace gas at the current collection point is smaller than 0.3, namely |delta eta CO| is smaller than 0.3, and the control value FR=FR of the current ton iron fuel ratio of the blast furnace Datum Step four is entered when |Δηco| is equal to or greater than 0.3;
step four: the absolute value of the metering difference value of the current collection point blast furnace gas utilization rate is smaller than 1, namely |delta eta CO| is smaller than 1, and the current ton iron fuel ratio control value FR=FR standard+ (eta CO standard-eta CO recent) ×A×0.5; step five is carried out when the current acquisition point |delta eta CO| is more than or equal to 1;
step five: the absolute value of the metering difference value of the current collection point blast furnace gas utilization rate is smaller than 2, namely |delta eta CO| is smaller than 2, and the current ton iron fuel ratio control value FR=FR standard+ (eta CO standard-eta CO recent) ×A×0.75; step six is entered when the current acquisition point |delta eta CO| is more than or equal to 2;
step six: the absolute value of the metering difference value of the current collection point blast furnace gas utilization rate is smaller than 3, namely |delta eta CO| is smaller than 3, and the current ton iron fuel ratio control value fr=fr standard+ (eta CO standard-eta CO recent) ×A×1 of the blast furnace; step seven is entered when the current acquisition point |delta eta CO| is more than or equal to 3;
step seven: the absolute value of the metering difference value of the utilization rate of the blast furnace gas at the current collection point is more than or equal to 3, namely |delta eta CO| is more than or equal to 3, and the control value FR=FR reference+ (eta CO) of the current ton iron fuel ratio of the blast furnace Datum -ηCO Recent times )×A×1.3；
Step eight: and (5) fuel is added according to the current ton iron fuel ratio control value FR of the blast furnace, so that the heat system of the blast furnace is stabilized.
2. The fuel ratio control method against fluctuation in the utilization ratio of blast furnace gas according to claim 1, characterized in that: the coke ratio, the coal injection amount per hour, the blanking speed and the blast furnace gas utilization rate under the blast furnace working condition are collected in real time, namely, the coke ratio, the coal injection amount per hour, the blanking speed and the blast furnace gas utilization rate are collected once every 10-60 minutes.
3. The fuel ratio control method against fluctuation in the utilization ratio of blast furnace gas according to claim 1, characterized in that: average value eta CO of blast furnace gas utilization rate in 8 hours before current time in step one Datum The method is characterized in that the method is an arithmetic average value of the blast furnace gas utilization rate in 8 hours before the current time, the unit is taken, and the average value of the blast furnace gas utilization rate in 8 hours before any collecting point in the second step is an arithmetic average value of the blast furnace gas utilization rate in 8 hours before the collecting point, and the unit is taken as%.
4. The fuel ratio control method against fluctuation in the utilization ratio of blast furnace gas according to claim 1, characterized in that: average value eta CO of blast furnace gas utilization rate of the first 1 hour of the current time in the second step Recent times Is the arithmetic average value of the utilization rate of blast furnace gas in 1 hour before the current time, eta CO Recent times Is equal to eta CO Datum The same acquisition point is given in units of%.
5. The fuel ratio control method against fluctuation in the utilization ratio of blast furnace gas according to claim 1, characterized in that: when FR is the same as Datum When less than 500kg/tA is 5.5 when 500 kg/t.ltoreq.FR Datum A is 6 when 520kg/t is less than 520kg/t and FR when 520kg/t is less than or equal to FR Datum A is 6.5 when < 550kg/t, when 550kg/t is +. Datum A is 7.5 when FR is less than 580kg/t Datum And A is 10 when the weight is more than or equal to 580 kg/t.
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