CN113621793A - Sintered solid fuel size control method - Google Patents

Sintered solid fuel size control method Download PDF

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CN113621793A
CN113621793A CN202110925891.1A CN202110925891A CN113621793A CN 113621793 A CN113621793 A CN 113621793A CN 202110925891 A CN202110925891 A CN 202110925891A CN 113621793 A CN113621793 A CN 113621793A
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solid fuel
sintering
sintered
sintered solid
value
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CN113621793B (en
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戚义龙
樊晶莹
杨国庆
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Maanshan Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/44—Optimum control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2239/00—Fuels
    • F23N2239/02—Solid fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2900/00—Special features of, or arrangements for controlling combustion
    • F23N2900/05001—Measuring CO content in flue gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2900/00—Special features of, or arrangements for controlling combustion
    • F23N2900/05002—Measuring CO2 content in flue gas

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  • Environmental & Geological Engineering (AREA)
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  • Organic Chemistry (AREA)
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  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention discloses a method and a system for controlling the particle size fraction of a sintered solid fuel, which utilize an on-site laser process gas analysis system to carry out on-line detection on CO and CO2 in the waste gas components in the sintering process, thereby obtaining a combustion ratio (CO/CO + CO 2) to measure the utilization degree of the chemical energy of the solid fuel carbon in the sintering process. And meanwhile, carrying out online detection on the particle size fraction of the sintered solid fuel, obtaining the combustion ratio of the solid fuel, the average particle size fraction of the sintered solid fuel, the sintering negative pressure and the historical data of the proportion of the sintered solid fuel by using a partial least square method, and carrying out reasonable control and adjustment on the particle size fraction of the sintered solid fuel by using the process parameters and the better combustion ratio (CO/CO + CO 2) of the sintered solid fuel. The utilization degree of the chemical energy of the carbon of the solid fuel is always in a better control interval, so that the smooth operation of the sintering process is supported, and the consumption level of the solid fuel is effectively reduced under the condition of meeting the requirements of the sintering process.

Description

Sintered solid fuel size control method
Technical Field
The invention relates to the technical field of sintering, in particular to a sintered solid fuel size fraction control system and a sintered solid fuel size fraction control method.
Background
The sintered ore is the main iron-containing raw material in blast furnace production, and is prepared through mixing return ore of blast furnace, sintered return ore, mixed ore, fuel and flux in certain proportion, adding proper amount of water, mixing and pelletizing, and sintering in sintering machine to form lump material. Factors influencing the quality of the sintered ore are many, and the proper proportion of different iron ore powder and the addition amount of fuel and flux need to be determined before sintering so as to meet the requirement of the blast furnace burden structure.
The particle size of the fuel has a great influence on the sintering process, and from the kinetic and thermodynamic analysis of carbon combustion in the sintering process, it can be known that:
1) when the particle size of the solid fuel is too large: the combustion speed becomes slow, the combustion zone widens, the air permeability of the sinter bed becomes poor, and the vertical sintering speed and the utilization coefficient of the sintering machine decrease. In the sintering and distributing process, large-particle coke powder or coal powder can be concentrated at the lower part of a sintering material layer due to segregation, and the heat of the lower layer is obviously higher than that of the upper layer due to the automatic heat storage effect, so that the over-melting phenomenon occurs, and the air permeability of the sintering material layer is reduced;
2) when the solid fuel particle size is too small: the carbon combustion speed is too fast, the liquid phase reaction is incomplete, the strength of sintered ore and the sintered product rate are reduced, and the utilization coefficient of a sintering machine is reduced. Thus, in the actual sintering process, a suitable particle size range for the solid fuel should be determined.
Due to market resources and procurement reasons, the types of raw materials for sintering are inevitably changed frequently, and the granularity of the raw materials fluctuates; the traditional control of the sintering fuel is stable and does not fluctuate to a certain extent, namely the particle size of the fuel is generally not adjusted along with the fluctuation of the particle size of the raw materials, or the particle size of the fuel is passively adjusted only according to the change of the sintered mineral substance amount, so that the problem that the particle size of the sintering fuel is not matched with the particle size of the sintering raw materials exists.
Through patent search, some related technical schemes are disclosed, for example:
for example, the chinese invention patent CN106939373B discloses a method for controlling the particle size of sintering fuel, belonging to the technical field of sintering. The control method comprises the following steps: controlling the average grain diameter D of the sintering raw material to be 2.5-6.5 mm; and adjusting the average grain size of the sintering fuel according to the average grain size of the sintering raw material, controlling the average grain size D of the sintering fuel to be 1.5-3mm, and simultaneously controlling the ratio range of the average grain size of the sintering fuel to the average grain size of the sintering raw material to be not less than 0.3 and not more than 0.6. The invention adjusts the particle size of the sintering fuel according to the particle size of the sintering raw material, so that the particle size of the sintering fuel is reasonably matched with the particle size of the sintering raw material, the combustion speed of the fuel is moderate, the air permeability of a sinter bed is good, the liquid phase reaction is complete, and the technical effects of improving the quality of the sinter and reducing the fuel consumption are achieved.
Chinese patent application, publication No.: CN110142095A, which discloses an intelligent control method and device for crushing sintered fuel, wherein the proportion of each grain size composition in the sintered fuel is determined according to the grain size composition of the sintered fuel corresponding to the current moment; the average value of the grain size composition proportion of the sintering fuel of the two times is calculated, and the average grain size composition proportion of the sintering fuel is used as a judgment basis, so that the accuracy of data can be improved, and errors are avoided. And judging whether the average particle size composition proportion meets the particle size constraint condition, if not, adjusting the gap between the upper roller and the lower roller of the fuel crusher according to an intelligent control rule. The intelligent control method and the intelligent control device can accurately adjust the gap between the upper roller and the gap between the lower roller of the fuel crusher, so that the particle size composition proportion of the crushed sintering fuel meets the particle size constraint condition. When the sintering fuel is applied to the sintering process, the phenomena of insufficient fuel at the upper part and excessive fuel at the lower part of a sintering material layer can be avoided, and the sintering quality of products can be improved.
Chinese invention patent CN106521145A discloses a method and apparatus for improving the combustion efficiency of sintering fuel, the method comprising: preparing materials for sintering in a material mixing chamber; mixing the materials for the first time; carrying out secondary mixing on the materials, wherein the water distribution amount of the materials after secondary mixing is 6.0-8.0% by mass; distributing the secondarily mixed materials on a sintering machine to form a sintering material surface; controlling the ignition temperature of the sintering machine to be 1000-1200 ℃; wherein, the slaked lime in the material is powdery; when preparing the materials, 40-80% of the total mass of the fuel is added into the materials in the batching chamber, and 20-60% of the total mass of the fuel is added into the materials within the last 1min of the secondary mixing. Therefore, lime is processed into powdery slaked lime by using the slaker, and the slaked lime cannot expand when meeting water in the granulation process of secondary mixing, so that the adhesion effect of fuel added in the secondary mixing is prevented from being damaged, and further, the fuel is prevented from being separated from other particles and moved down and taken away by air draft; finally, the use effect of the fuel is ensured, and the combustion rate is improved.
The above publications have certain disadvantages, and only satisfy the basic requirements of the sintering process, and fail to fully consider the efficient control of the chemical energy of the sintered solid fuel, so the practical production effect of supporting the stable and smooth operation of the sintering process and reducing the consumption of the sintered solid fuel is limited.
Disclosure of Invention
The invention aims to solve the technical problem of realizing a sintering solid fuel particle size control system and a control method, so that the utilization degree of the chemical energy of the carbon of the solid fuel is always in a better control interval, thereby supporting the smooth operation of the sintering process and being beneficial to effectively reducing the consumption level of the solid fuel under the condition of meeting the requirements of the sintering process.
In order to achieve the purpose, the invention adopts the technical scheme that: a sintered solid fuel fraction control method comprising the steps of:
step 1, obtaining waste gas in a sintering machine air box branch pipe, and obtaining CO and CO in the waste gas2The concentration value of (a);
step 2, according to CO and CO2The solid fuel combustion ratio is calculated according to the concentration value;
step 3, obtaining the composition of each grade of the solid fuel burdening and feeding position of the sintering machine, and obtaining the average grade of the sintered solid fuel;
step 4, analyzing historical data of the combustion ratio of the solid fuel, the average particle size fraction of the sintered solid fuel, the sintering negative pressure and the proportion of the sintered solid fuel by using a partial least square method to obtain a multiple regression formula;
and 5, forming a historical basic sample data set by taking the average numerical value of each parameter per 30-minute period as 1 sample data. Considering the time sequence corresponding relation of each datum, and then judging the target value of the average particle size control adjustment of the sintered solid fuel according to the sintering process parameters and the combustion ratio of the better sintered solid fuel;
step 6, adjusting the combustion ratio of the solid fuel to enable the average particle size fraction of the sintered solid fuel to approach a target value, namely acquiring the target value of the average particle size fraction of the sintered solid fuel by taking the combustion ratio of the sintered solid fuel as a target according to the condition of the numerical distribution range of the combustion ratio of the sintered solid fuel and carrying out control adjustment of different grades;
and 7, adjusting the average particle size of the sintered solid fuel to enable the average particle size of the sintered solid fuel to approach a target value, namely adjusting the crushing technological parameters of the sintered solid fuel according to the target value of the average particle size of the better sintered solid fuel, so that the linear particle size detection value of the sintered solid fuel approaches a control target value, and realizing the control adjustment of the particle size of the sintered solid fuel.
In the step 1, an in-place laser process gas analysis system is adopted to analyze the waste gas of a specified bellows branch pipe to which the sintering machine belongs, and in the step 3, an online size fraction detection device is arranged at a sintering solid fuel batching and feeding position to analyze the average size fraction of the sintering solid fuel.
In the step 1, a plurality of points are arranged on the sampling points of the waste gas, and CO at each sampling point2The concentration value of (A) is processed into an average value, and then the average value is processed into a value of [ CO/(CO + CO ]2) Calculating the burning ratio R of the sintered solid fuelb。
When any one of the following conditions is met, the currently calculated burning ratio value of the sintered solid fuel is removed; 1) when the sintering is stopped or the end point position of the sintering process is abnormally advanced; 2) the rising point position of the sintering end point is advanced to the position before the exhaust gas sampling point.
The time difference between the start of the sintering batch feed and the first exhaust gas sampling point is calculated as the time interval between the execution of the cycles of step 1 to step 7.
In the step 4, the combustion ratio R of the solid fuel in the interval time is obtainedbAverage size fraction M of sintered solid fuelRSintering negative pressure P and sintering solid fuel ratio PRAnd calculating a set of average values, and forming a historical base sample by using each set of average values as a sample dataThis data set.
In the step 4, a multiple regression analysis formula:
Rb＝α*PR+β*P+γ*MR+C
wherein R isbIs the combustion ratio of solid fuel, PRFor the proportion of the sintered solid fuel, P is the negative pressure in the sintering process, MRThe average particle size fraction of the sintered solid fuel is alpha, beta and gamma which are regression coefficients, and C is a constant term;
r in historical base sample data setbAnd MRCalculating the mean value
Figure BDA0003209254030000051
And corresponding data interval range value | RbI and I MR|。
In the step 6, the sintering solid fuel proportion PR is adjusted in real time according to the actual composition of the sintering ore FeO and the corresponding sintering ore FeO control reference value, so that the average particle size of the sintering solid fuel approaches the target value.
In said step 7, the current Rb is compared with
Figure BDA0003209254030000052
And (3) comparison:
if it is
Figure BDA0003209254030000053
If yes, the average grade of the sintered solid fuel maintains the current grade value, and the crushing technological parameters of the solid fuel are not adjusted;
if it is
Figure BDA0003209254030000054
If yes, obtaining the current sintering negative pressure P and the sintering solid fuel ratio PRData, and the current combustion ratio Rb70% of the values correspond to the values that are carried over:
MR′＝(70％*Rb-α*PR-C- β P)/γ, obtaining MR' value;
the parameters of the sintering solid fuel crushing process are correspondingly adjusted,the on-line size fraction detection device at the position of feeding the sintered solid fuel is close to MR' value.
The invention utilizes an in-situ laser process gas analysis system to analyze CO and CO in the waste gas components in the sintering process2Performing on-line detection to obtain combustion ratio [ CO/CO + CO ]2The degree of utilization of the chemical energy of the solid fuel carbon during sintering is measured. Meanwhile, the particle size fraction of the sintered solid fuel is detected on line, the combustion ratio of the solid fuel, the average particle size fraction of the sintered solid fuel, the sintering negative pressure and the historical data of the proportion of the sintered solid fuel are obtained by a partial least square method to carry out multiple regression, and the process parameters and the combustion ratio of the sintered solid fuel [ CO/CO + CO ] which is better are used2The particle size of the sintered solid fuel is reasonably controlled and adjusted. The utilization degree of the chemical energy of the carbon of the solid fuel is always in a better control interval, so that the smooth operation of the sintering process is supported, and the consumption level of the solid fuel is effectively reduced under the condition of meeting the requirements of the sintering process.
Drawings
The following is a brief description of the contents of each figure in the description of the present invention:
FIG. 1 shows CO and CO in the exhaust gas from the sintering process2The trend of change of (c);
FIG. 2 is a graph showing the relationship between the burning ratio of sintering exhaust gas and the fraction of solid fuel;
FIG. 3 is a graph showing the relationship between the burning ratio of sintering exhaust gas and the fraction of solid fuel;
FIG. 4 is a graph showing the relationship between the combustion ratio of the sintering waste gas and the sintering negative pressure.
Detailed Description
The following description of the embodiments with reference to the drawings is provided to describe the embodiments of the present invention, and the embodiments of the present invention, such as the shapes and configurations of the components, the mutual positions and connection relationships of the components, the functions and working principles of the components, the manufacturing processes and the operation and use methods, etc., will be further described in detail to help those skilled in the art to more completely, accurately and deeply understand the inventive concept and technical solutions of the present invention.
As shown in FIG. 1In the invention, an in-situ laser process gas analysis system is adopted to analyze CO and CO in the waste gas of the specified air box branch pipe of the sintering machine2And carrying out online data detection. The measurement probe of the in-situ laser process gas analysis system consists of a transmitting unit and a receiving unit and has multiple functions of spectral analysis, man-machine interaction, positive pressure control, data communication and the like. The transmitting unit is composed of devices such as a human-computer interface, a laser driving module, a central processing module, a semiconductor laser, a precise optical element and the like, mainly realizes functions such as semiconductor laser transmission, spectrum data processing, human-computer interaction and the like, and the receiving unit is composed of a photoelectric sensor, a signal processing module, a power supply module, the precise optical element and the like. The main function of the receiving unit is to receive the sensing signal and transmit the spectral absorption signal to the transmitting unit for processing. The positive pressure control module has special explosion-proof design for a laser process gas analysis system, the transmitting and receiving unit of the positive pressure control module adopts positive pressure explosion-proof design, and protective gas (nitrogen) is introduced into the box body to achieve the positive pressure explosion-proof effect. The transmitting unit and the receiving unit are connected with the detected process gas pipeline through an instrument flange, a welding flange and a locking hoop. The power supply is turned on, the root valve is opened, laser with specific frequency emitted by the semiconductor laser passes through the gas channel through the emitting unit, the attenuated laser beam is received by the sensor in the receiving unit, the measuring signal is transmitted to the central analysis module, the central analysis module analyzes and processes the measuring signal to obtain the concentration of the gas to be measured, and the gas concentration information is displayed through the liquid crystal display screen and is output through the standard interface. In order to prevent dust and other pollutants in the tested environment from accumulating on the window, a gas such as industrial nitrogen is required to be continuously blown through a blowing gas inlet so as to form a section of gas curtain protection between the optical window and the industrial gas.
The on-line laser process gas analysis system can be directly installed on a process gas pipeline or utilizes a sampling tube to lead the detected gas to a built-in process gas detection pipeline of the on-line laser process gas analysis system for on-line detection of gas components by an air pump. CO and CO in sintering waste gas in normal sintering production process2Is rich inThe degree change law is shown in figure 1, namely sintering head and tail bellows waste gases CO and CO2Low concentration, sintering middle bellows waste gas CO and CO2The concentration is high. While the burning ratio [ CO/(CO + CO) ] is usually used in the sintering process2) The utilization degree of chemical energy of the solid fuel carbon in the sintering process is measured, if the combustion ratio is large, the carbon utilization is poor, and the atmosphere reducibility is stronger, otherwise, the carbon utilization is good, and the oxidizing atmosphere is strong.
Sampling the analyzed CO and CO from multiple sampling points2The concentration value of (A) is averaged according to [ CO/(CO + CO ]2) Calculating a combustion ratio R of the sintered solid fuelb：
Rb＝CO/(CO+CO2) Formula 1
When the sintering machine stops or the end point position of the sintering process is abnormally advanced, and the rising point position of the sintering end point is advanced to the position of the No. 15 sintering air box, the calculated sintering solid fuel combustion ratio value is rejected through the setting of a judging program;
an online particle size detection device is arranged at the proportioning and feeding position of the sintered solid fuel, so that the composition of each particle size of the sintered solid fuel can be obtained in real time, and the average particle size MR of the sintered solid fuel is obtained;
according to the principle of the sintering process, under the condition that the thickness of a sintering layer and the proportion of sintering return ores are stable, the influence factors of the combustion ratio of sintering waste gas comprise the fraction of sintered solid fuel particles (shown in figure 2), the proportion of solid fuel (shown in figure 3) and the negative pressure of the sintering process (shown in figure 4). Combustion ratio R of the solid fuelbAverage size fraction M of sintered solid fuelRSintering negative pressure P and sintering solid fuel ratio PRThe data of (a) take an average value of 30 minutes.
The average value of each parameter in each 30-minute period is 1 sample data, and a historical basic sample data set is formed.
The time difference from the start of feeding the sintering ingredients to the position of the sintering 5# sintering windbox branch pipe is about 30min, and the real-time detection of the sintering solid fuel particle size fraction, the real-time proportion value and the combustion ratio R of the sintering solid fuel are consideredbAnd the time sequence corresponding relation of the sintering negative pressure P.
And the proportion PR of the sintered solid fuel is adjusted in real time according to the actual composition of the FeO of the sintered ore and the corresponding control reference value of the FeO of the sintered ore.
The combustion ratio R of the solid fuel is determined by partial least squaresbAverage size fraction M of sintered solid fuelRSintering negative pressure P and sintering solid fuel ratio PRThe following formula can be obtained by performing multiple regression analysis on the historical data.
Rb＝α*PR+β*P+γ*MR+ C formula 2
In the formula: rbCombustion ratio (%) of solid fuel; p is the negative pressure (KPa) of the sintering process; pRThe proportion of the sintered solid fuel is (%); mRIs the average size fraction (mm) of the sintered solid fuel; α, β, γ: are all regression coefficients; c is a constant term.
Average size fraction M for the above-mentioned sintered solid fuelRAnd the combustion ratio R of the sintered solid fuelbThe historical data is processed to obtain the corresponding mean value
Figure BDA0003209254030000081
And corresponding data interval range value | Rb|、|MR|。
Under the normal crushing process condition, the average size fraction range of the sintered solid fuel corresponding to the sintered solid fuel is about 1.55mm-2.75mm, wherein the size fraction of the solid fuel which is less than or equal to 0.5mm is 18-33%, the size fraction of 0.5mm-1mm is 12-25%, the size fraction of 1mm-2mm is 9-20%, the size fraction of 2mm-3mm is 9-22%, the size fraction of 3mm-5mm is 10-37%, the size fraction of 5mm-8mm is 0-21%, and the size fraction of more than or equal to 8mm is 0-7%.
Derived from the above equation 2
MR＝(Rb-α*PR-C-beta P)/gamma formula 3
The combustion ratio R of the solid fuel of the current 30min periodbAnd
Figure BDA0003209254030000091
ratio of performanceThan, if
Figure BDA0003209254030000092
When the process is established, the average grade of the sintered solid fuel maintains the current grade value, and the crushing process parameters of the solid fuel are not adjusted.
If the current combustion ratio R of the solid fuel for the 30min periodbAnd
Figure BDA0003209254030000093
make a comparison, and
Figure BDA0003209254030000094
when the sintering process is finished, the sintering negative pressure P and the sintering solid fuel ratio P in the current 30min period are matchedRData, and the current combustion ratio R of solid fuel for the 30min cycleb70% of the values are substituted into the above formula 3 to obtain MRA value of
MR′＝(70％*Rb-α*PR-C-beta P)/gamma formula 6
At this time, the average particle size of the sintered solid fuel is adjusted to MRThe value of the device is that the crushing process parameters of the sintered solid fuel need to be adjusted correspondingly, so that the indication value of an online size fraction detection device at the proportioning and feeding position of the sintered solid fuel approaches to MR' value.
The average particle size fraction of the sintered solid fuel is controlled and adjusted by repeating the steps through program calculation, so that the utilization degree of the chemical energy of the carbon of the solid fuel is always in a better control interval, the smooth operation of the sintering process is supported, and the consumption level of the solid fuel is effectively reduced under the condition of meeting the requirements of the sintering process.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.

Claims (9)

1. A method for controlling the fraction of sintered solid fuel, comprising the steps of:
step 1, obtaining waste gas in a sintering machine air box branch pipe, and obtaining CO and CO in the waste gas2The concentration value of (a);
step 2, according to CO and CO2The solid fuel combustion ratio is calculated according to the concentration value;
step 3, obtaining the composition of each grade of the solid fuel burdening and feeding position of the sintering machine, and obtaining the average grade of the sintered solid fuel;
step 4, analyzing historical data of the combustion ratio of the solid fuel, the average particle size fraction of the sintered solid fuel, the sintering negative pressure and the proportion of the sintered solid fuel by using a partial least square method to obtain a multiple regression formula;
step 5, setting a target value of the average size fraction of the sintered solid fuel;
step 6, adjusting the combustion ratio of the solid fuel to enable the average particle size of the sintered solid fuel to approach a target value;
and 7, adjusting the average size fraction of the sintered solid fuel to enable the average size fraction of the sintered solid fuel to approach a target value.
2. The sintered solid fuel fraction control method according to claim 1, characterized in that: in the step 1, an in-place laser process gas analysis system is adopted to analyze the waste gas of a specified bellows branch pipe to which the sintering machine belongs, and in the step 3, an online size fraction detection device is arranged at a sintering solid fuel batching and feeding position to analyze the average size fraction of the sintering solid fuel.
3. The sintered solid fuel fraction control method according to claim 2, characterized in that: in the step 1, a plurality of sampling points are arranged on the waste gas sampling point, and each sampling point is provided withCO and CO of2The concentration value of (A) is processed into an average value, and then the average value is processed into a value of [ CO/(CO + CO ]2) Calculating the burning ratio R of the sintered solid fuelb。
4. The sintered solid fuel fraction control method according to claim 3, characterized in that: when any one of the following conditions is met, the currently calculated burning ratio value of the sintered solid fuel is removed; 1) when the sintering is stopped or the end point position of the sintering process is abnormally advanced; 2) the rising point position of the sintering end point is advanced to the position before the exhaust gas sampling point.
5. The sintered solid fuel fraction control method according to any one of claims 1 to 4, characterized in that: the time difference between the start of the sintering batch feed and the first exhaust gas sampling point is calculated as the time interval between the execution of the cycles of step 1 to step 7.
6. The sintered solid fuel fraction control method according to claim 5, characterized in that: in the step 4, the combustion ratio R of the solid fuel in the interval time is obtainedbAverage size fraction M of sintered solid fuelRSintering negative pressure P and sintering solid fuel ratio PRAnd calculating a group of average values, and forming a historical basic sample data set by using each group of average values as one sample data.
7. The sintered solid fuel fraction control method according to claim 6, characterized in that: in the step 4, a multiple regression analysis formula:
Rb＝α*PR+β*P+γ*MR+C
wherein R isbIs the combustion ratio of solid fuel, PRFor the proportion of the sintered solid fuel, P is the negative pressure in the sintering process, MRThe average particle size fraction of the sintered solid fuel is alpha, beta and gamma which are regression coefficients, and C is a constant term;
r in historical base sample data setbAnd MRCalculating the mean value
Figure FDA0003209254020000021
And corresponding data interval range value | RbI and I MR|。
8. The sintered solid fuel fraction control method according to claim 7, characterized in that: in the step 6, the sintering solid fuel proportion PR is adjusted in real time according to the actual composition of the sintering ore FeO and the corresponding sintering ore FeO control reference value, so that the average particle size of the sintering solid fuel approaches the target value.
9. The sintered solid fuel fraction control method according to claim 8, characterized in that: in said step 7, the current Rb is compared with
Figure FDA0003209254020000022
Comparing;
if it is
Figure FDA0003209254020000023
If yes, the average grade of the sintered solid fuel maintains the current grade value, and the crushing technological parameters of the solid fuel are not adjusted;
if it is
Figure FDA0003209254020000024
If yes, obtaining the current sintering negative pressure P and the sintering solid fuel ratio PRData, and the current combustion ratio Rb70% of the values correspond to the values that are carried over:
M′R＝(70％*Rb-α*PR-C- β P)/γ, obtaining MR' value;
the parameters of the sintering solid fuel crushing process are correspondingly adjusted, so that the indication value of an online particle size detection device at the proportioning and feeding position of the sintering solid fuel approaches to MR' value.
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CN112522508A (en) * 2020-12-03 2021-03-19 华北理工大学 Method for controlling particle size of sintering fuel
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