CN115821036A - Method for regulating and controlling operation speed of sintering machine - Google Patents
Method for regulating and controlling operation speed of sintering machine Download PDFInfo
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Abstract
The invention discloses a method for regulating and controlling the running speed of a sintering machine, which comprises the following steps: determining chemical components of the uniformly mixed mineral powder, and optimizing a raw material proportioning interval according to the chemical components and proportioning, wherein the mass percentage content of the optimized raw material proportioning interval is as follows: 57.31 to 59.22 percent of evenly mixed mineral powder; return fines 25.00% -27.19%; 3.78 to 3.82 percent of combustion agent; 4.50% -4.75% of limestone; 4.32 to 4.41 percent of dolomite; 2.80% -2.90% of dedusting ash; paving sintering bed charge and uniformly mixed mineral powder on a sintering trolley; calculating the running speed of the sintering trolley, adjusting the frequency and determining the running speed of the sintering trolley; cooling, screening and testing after the sintering process is finished, and fine-tuning, correcting and re-sintering and testing; and (5) carrying out full-load production after the test result is qualified. The invention solves the problem of uneven quality of the sintering ore caused by the high and low running speed of the sintering machine trolley, and improves the quality of the sintering ore.
Description
Technical Field
The invention belongs to the field of steel smelting, and particularly relates to a method for regulating and controlling the running speed of a sintering machine.
Background
The sintered ore is one of the important raw materials for modern blast furnace ironmaking, the percentage of the sintered ore in blast furnace smelting reaches about 70 percent, and the quality of the sintered ore directly influences whether blast furnace production is smooth or not. The direct factors influencing the quality of the sintering ore comprise the mixture ratio of raw materials, the ignition temperature of an ignition furnace of the sintering trolley, the running speed of the sintering trolley and the like, the mixture ratio of the raw materials is used for supporting the quality of the sintering ore, the selection is relatively mature, so that the factors influencing the quality of the sintering ore on the raw materials are reduced to the minimum, simultaneously, the multivariable influence factors are converted into univariate influence factors, and a better control method is provided.
On the premise of ensuring the optimal mixing ratio of the raw materials, the variables are set as follows: the method comprises the steps of setting a main variable as the paving thickness and an auxiliary variable as the material layer temperature, controlling the running speed of a sintering trolley by the two variables, changing a control method object into a simple mathematical model, establishing the mathematical model after acquiring data on site, and finally obtaining the oxygen-enriched combustion state of an ignition furnace of the sintering trolley (the oxygen-enriched value is set to be 4%, the fuel gas consumption can be reduced by about 6% -9% in the state, the screened yield is improved by about 3%, and the emission of carbon-containing organic matters and nitrogen oxides is reduced by about 10%), constructing the mathematical model of the paving thickness and the running speed of the sintering trolley in the combustion environment, and guiding sintering production by using 8 thermocouples with temperature transmitters to cooperate.
Disclosure of Invention
In order to solve the problem of uneven quality of sintered ore caused by high and low running speeds of a trolley of a sintering machine in the prior art, the invention aims to provide a running speed regulating method of a sintering machine.
In order to realize the purpose of the invention, the following technical scheme is adopted:
the invention provides a method for regulating and controlling the running speed of a sintering machine, which comprises the following steps:
step 3, paving sintering bed materials including return ores, a combustion agent, limestone, dolomite and fly ash on the sintering trolley;
step 5, calculating the running speed of the sintering trolley according to the thickness of the laid and uniformly mixed mineral powder;
step 6, adjusting the frequency of the sintering trolley and determining the running speed of the sintering trolley;
step 7, cooling, screening and testing after the sintering process is finished;
step 8, fine adjustment and correction are carried out according to the test result, and then sintering test is carried out;
and 9, qualified test results and full-load production.
Preferably, in step 1, the method for determining the chemical components of the blended ore powder includes:
step 1a: calculating the raw material mixing ratio of the sintering ore by adopting a crucible trial firing mode, weighing 100 parts by weight of high-quality sintering ore as a standard substance, and performing physical and chemical tests on the standard substance to obtain the following main component substances: 56.1 percent of TFe; siO 2 2 :5.43％；CaO:10.59％；MgO:1.61％；
Step 1b: substituting the chemical component formula of sintered mineral into the main component substance content obtained in step 1a to obtain TFe and SiO carried in by various raw materials 2 Amounts of CaO, mgO, mn:
sinter TFe = sum of TFe carried in by each raw material/total residual amount of combustion;
sintered SiO ore 2 = SiO carried in by raw materials 2 Sum/total residual amount of combustion;
CaO of sintered ore = sum of CaO brought in by various raw materials/total residual amount of burning;
sintered ore MgO = sum of MgO introduced from various raw materials/total amount of remaining burned;
sinter Mn = sum of Mn brought in by various raw materials/total residual amount of burning;
step 1c: substituting TFe and SiO brought by various raw materials into the raw materials by the following formula 2 And calculating the amount of CaO, mgO and Mn to obtain the mixing ratio of the raw materials:
the TFe = TFe content of the raw material x the proportion of the raw material;
SiO = SiO in the batch material 2 The amount is multiplied by the proportion of the raw materials;
CaO = CaO content of the raw material x the proportion of the raw material;
MgO = MgO content in the batch x the raw material ratio;
mn = Mn content in the raw material x the raw material ratio;
the content of various elements is obtained according to the physical and chemical analysis of the known raw materials, and the content of the auxiliary components is obtained by combining the market price as follows:
blocking powder: 23 percent; a, A powder: 10 percent; and (3) poplar powder: 46 percent; and (3) SiC concentrate: 4 percent; ultra-special powder: 5 percent; and (3) preparing the powder of Rake: 4 percent; iron dust mud: 2 percent; b, sieving, namely, sieving: 4 percent; refined plum powder: 2 percent;
wherein the main component and the auxiliary component are combined to determine the chemical components of the uniformly mixed mineral powder.
Preferably, the optimization steps of the raw material batching interval in the step 2 are as follows:
step 2a: according to the chemical components of the uniformly mixed mineral powder determined in the step 1, the raw material ingredients of the sintered ore are preliminarily estimated according to the mass percentage:
mixing mineral powder uniformly: 55% -60%; returning ores: 25% -30%; and (3) combustion agent: 3.6% -4.4%; limestone: 4% -4.3%; dolomite: 4% -4.5%; electric dedusting ash: 3% -4%;
and step 2b: the specific raw material ingredients of the two groups of sintering ores obtained by the high-temperature push plate furnace test are calculated according to the mass percentage:
mixing mineral powder uniformly: 57.03 percent; returning ores: 27 percent; and (3) combustion agent: 3.75 percent; limestone: 4.5 percent; dolomite: 4.25 percent; dust removal: 2.9 percent;
mixing mineral powder uniformly: 59.22 percent; returning ores: 25 percent; and (3) combustion agent: 3.82 percent; limestone: 4.8 percent; dolomite: 4.4 percent; dust removal: 2.8 percent;
and step 2c: according to the sintered ore alkalinity quality calculation formula
The obtained raw material proportioning interval is calculated according to the mass percentage: mixing mineral powder uniformly: 57.31% -59.22%; return fines 25.00% -27.19%; and (3) combustion agent: 3.78% -3.82%; limestone: 4.50% -4.75%; dolomite: 4.32% -4.41%; dust removal: 2.80 to 2.90 percent.
Preferably, in step 5, the controlling the running speed of the trolley by the paving thickness under the condition that the ignition condition is kept unchanged (namely 4% oxygen-enriched combustion state) comprises the following steps:
calculating the hourly operation speed according to the consumption formula S = VHBN rho
Wherein:
s: actual consumption, t;
v: the hourly running speed of the sintering machine, m/h, is a dependent variable;
h: the height of the trolley breast board, m, is a variable;
n: the thickness of the bedding material, m, is a constant and is set according to the factory parameters of the sintering machine;
ρ: uniformly mixing the mineral powder with the density of kg/m;
wherein the density rho of the uniformly mixed mineral powder is a known quantity according to a density formula
After the nine-roller material distributor distributes materials evenly, a material column with the height of 100mm is randomly taken on the trolley by using a steel pipe with the inner diameter of 100mm on the trolley, a plurality of groups of samples are randomly extracted (the larger the number of the samples is, the more accurate the samples are), and the average density value is taken.
In order to ensure a single variable, the air draft rate is set as micro negative pressure (-15 KPa) by adopting sintering machine sinter guidance parameters, the constant is determined to be constant after the setting is carried out in the sintering process, at the moment, the variable influencing the quality of the sintered ore becomes the single variable spreading thickness, and the data obtained after the mineral products are qualified through test is used for constructing a mathematical model of the material layer thickness and the operation speed of the sintering machine
y＝-6.804x+7.6136；
Wherein, x: material layer thickness, m;
y: the running speed of the sintering machine is m/h;
the running speed of the sintering machine is obtained by giving the corresponding bed thickness.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention separates the large influence factors in the sintering process for classification analysis, and makes full use of mathematical thinking to simplify the variables, thereby simplifying the control method.
2. According to the invention, two groups of specific test data are obtained through a high-temperature push plate furnace test, so that the test data are closer to the real sintering environment of the sintering trolley, and the authenticity and the feasibility of the test are ensured.
3. The invention converts the complex production relation between the running speed of the sintering trolley and the material layer thickness into a simple mathematical relation, so that the control method is clear.
4. The invention simplifies the sintering and batching process, gives a raw material interval, saves a trial batching link of daily batching, simplifies and quickens batching, reduces the production cost for production, and quickens and improves the production efficiency.
5. The invention completes the pre-proportioning and the pre-sintering on the small-sized test equipment through the test equipment, reduces the waste generated by the pre-proportioning and the pre-sintering on the trolley, simplifies the two links simultaneously, and greatly optimizes the preparation process and the manpower and material resources.
6. The invention finally obtains the relation between the batching interval table and the trolley material layer thickness and the running speed through a test and summary method, and obtains a unitary one-time function formula from the relation, and the unitary one-time function formula can be directly brought into use in the production process in the future, thereby greatly facilitating the production.
7. The sintering process can adjust the running speed of the trolley in real time according to the thickness of the material layer, so that a large number of defective products generated in batch production are avoided, the loss is greatly avoided, and the cost and the efficiency of an enterprise are reduced.
Drawings
FIG. 1 is a bar chart of the interval table of the optimized raw material in the example.
FIG. 2 is a graph showing the linear relationship between the thickness of the bed of the trolley and the running speed in the example.
Detailed Description
The invention is further illustrated by the following specific examples, which are intended to be illustrative only and not to limit the scope of the invention.
Example 1
The embodiment provides a method for regulating and controlling the running speed of a sintering machine, which comprises the following steps:
raw material mixing ratio
step 1a: calculating the raw material mixing ratio of the sintering ore by adopting a crucible trial firing mode, weighing 100 parts by weight of high-quality sintering ore as a standard substance, and performing physical and chemical tests on the standard substance to obtain the following main component substances: 56.1 percent of TFe; siO 2 2 :5.43％；CaO:10.59％；MgO:1.61％；
Step 1b: substituting the chemical component formula of sintered mineral into the main component substance content obtained in step 1a to obtain TFe and SiO carried in by various raw materials 2 Amounts of CaO, mgO, mn:
sinter TFe = sum of TFe carried in by each raw material/total residual amount of combustion;
sintered SiO ore 2 = SiO carried in by raw materials 2 Sum/total residual amount of combustion;
CaO = CaO of sintered ore/total amount of residual burnt material of the sum of CaO introduced by each raw material;
sintered ore MgO = sum of MgO introduced from various raw materials/total amount of remaining burned;
sinter Mn = sum of Mn brought in by various raw materials/total residual amount of burning;
wherein TFe and SiO in each raw material are measured at the moment assuming that the water content of each raw material is zero 2 CaO, mgO, mn content;
step 1c: substituting TFe and SiO brought by various raw materials into the raw materials by the following formula 2 And the amount of CaO, mgO and Mn is calculated to obtain the mixing ratio of the raw materials:
TFe = TFe content of the raw material x the raw material ratio in the batch;
SiO = SiO in the batch material 2 The amount is multiplied by the proportion of the raw materials;
the CaO = CaO content of the raw material multiplied by the proportion of the raw material in the batch;
MgO = MgO content in the batch x the raw material ratio;
mn = Mn content in the raw material x the raw material ratio;
the method comprises the following steps of carrying out physical and chemical analysis on raw materials of a factory to obtain the content of various elements, and simultaneously obtaining the content of auxiliary components by combining market prices as follows:
blocking powder: 23 percent; a, A powder: 10 percent; and (3) poplar powder: 46 percent; and (3) SiC concentrate: 4 percent; ultra-special powder: 5 percent; and (3) preparing the powder of Rake: 4 percent; iron dust mud: 2 percent; b, sieving, namely, sieving: 4 percent; refined plum powder: 2 percent (purchasing finished product of evenly mixed mineral powder can also be used as a standard according to the mixing proportion);
wherein the main component and the auxiliary component are combined to determine the chemical components of the uniformly mixed mineral powder.
step 2a: according to the chemical components of the uniformly mixed mineral powder determined in the step 1, the raw material ingredients of the sintered ore are preliminarily estimated according to the mass percentage:
mixing mineral powder uniformly: 55% -60%; return of ores: 25% -30%; and (3) combustion agent: 3.6% -4.4%; limestone: 4% -4.3%; dolomite: 4% -4.5%; electric dedusting ash: 3% -4%;
and step 2b: the specific raw material ingredients of the two groups of sintering ores obtained by the high-temperature push plate furnace test are calculated according to the mass percentage:
mixing mineral powder uniformly: 57.03 percent; returning ores: 27%; and (3) combustion agent: 3.75 percent; limestone: 4.5 percent; dolomite: 4.25 percent; dedusting ash: 2.9 percent;
mixing mineral powder uniformly: 59.22 percent; returning ores: 25 percent; and (3) combustion agent: 3.82 percent; limestone: 4.8 percent; dolomite: 4.4 percent; dedusting ash: 2.8 percent;
and step 2c: according to the sintered ore alkalinity quality calculation formula
The optimized raw material mixing interval is calculated according to the mass percentage: mixing mineral powder uniformly: 57.31% -59.22%; return fines 25.00% -27.19%; and (3) combustion agent: 3.78% -3.82%; limestone: 4.50% -4.75%; dolomite: 4.32% -4.41%; dust removal: 2.80% -2.90% (fig. 1).
And 3, paving sintering bed materials on the sintering trolley, wherein the sintering bed materials comprise return ores, a combustion agent, limestone, dolomite and fly ash.
And 4, paving the calculated amount of the uniformly mixed mineral powder on a sintering trolley.
(II) spreading thickness and trolley running speed
Step 5, calculating the running speed of the sintering trolley according to the thickness of the laid uniformly mixed mineral powder, and specifically comprising the following steps:
under the condition that the ignition condition remains unchanged (namely 4% oxygen-enriched combustion state), the operation speed of the trolley is controlled through the paving thickness, and the method comprises the following steps:
calculating the hourly operation speed according to the consumption formula S = VHBN rho
Wherein:
s: actual consumption, t;
v: the hourly running speed of the sintering machine, m/h, is a dependent variable;
h: the height of the trolley breast board, m, is a variable;
n: the thickness of the bedding material, m, is a constant and is set according to factory parameters of the sintering machine;
ρ: uniformly mixing the mineral powder with the density of kg/m;
wherein the density rho of the uniformly mixed mineral powder is a known quantity according to a density formula
After the nine-roller material distributor distributes materials evenly, a material column with the height of 100mm is randomly taken on the trolley by using a steel pipe with the inner diameter of 100mm on the trolley, a plurality of groups of samples are randomly extracted (the larger the number of the samples is, the more accurate the samples are), and the average density value is taken.
Step 6, adjusting the frequency of the sintering trolley, and determining the running speed of the sintering trolley, wherein the method specifically comprises the following steps:
in order to ensure a single variable, the draft rate is set as micro negative pressure (-15 KPa) by adopting sintering machine sintering ore guide parameters, the constant is determined to be constant after the setting is carried out in the sintering process, the variable influencing the quality of the sintering ore becomes the single variable paving thickness, and a mathematical model of the material layer thickness and the sintering machine running speed is constructed by data obtained after the test shows that the mineral products are qualified, as shown in figure 2:
y＝-6.804x+7.6136；
wherein, x: material layer thickness, m;
y: the running speed of the sintering machine is m/h;
the running speed of the sintering machine is obtained by giving the corresponding bed thickness.
And 7, cooling, screening and testing after the sintering process is finished.
And 8, fine adjustment and correction according to the test result, and sintering for testing.
And 9, qualified test results and full-load production.
The raw material proportion optimization and trolley running speed control method is obtained according to the existing equipment and the conclusion of raw material reasoning tests, and can meet the requirements of normal production of the equipment and on the premise of meeting the requirements of the raw material through production argumentation, but the method is used subsequently, because the mineral production area and the quality are different, the pilot production is required according to the method before the regeneration production, the batch production can be realized after the pilot production is qualified through test testing, and the fine adjustment can be carried out on the basis if the pilot production is unqualified, so that the purpose of improving the quality of the sintering ore by optimizing the test adjustment mixing proportion is achieved on the basis.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments and the generic principles defined herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention according to the principle of the present invention without departing from the scope of the present invention.
Claims (5)
1. A method for regulating and controlling the running speed of a sintering machine is characterized by comprising the following steps:
step 1, determining chemical components of uniformly mixed mineral powder;
step 2, according to the chemical components of the uniformly mixed mineral powder determined in the step 1, the material mixing is started after a material mixing interval is optimized, wherein the optimized material mixing interval is calculated according to the mass percentage: mixing mineral powder uniformly: 57.31% -59.22%; returning ores: 25.00% -27.19%; and (3) combustion agent: 3.78% -3.82%; limestone: 4.50% -4.75%; dolomite: 4.32% -4.41%; dust removal: 2.80% -2.90%;
step 3, paving sintering bed materials including return ores, a combustion agent, limestone, dolomite and fly ash on the sintering trolley;
step 4, paving the calculated amount of the uniformly mixed mineral powder on a sintering trolley;
step 5, calculating the running speed of the sintering trolley according to the thickness of the laid uniformly mixed mineral powder;
step 6, adjusting the frequency of the sintering trolley and determining the running speed of the sintering trolley;
step 7, cooling, screening and testing after the sintering process is finished;
step 8, fine adjustment and correction are carried out according to the test result, and then sintering test is carried out;
and 9, qualified test results and full-load production.
2. The method for regulating and controlling the operation speed of the sintering machine according to claim 1, wherein in the step 1, the method for determining the chemical components of the blended ore powder comprises the following steps:
step 1a: calculating the raw material mixing ratio of the sintering ore by adopting a crucible trial firing mode, weighing 100 parts by weight of high-quality sintering ore as a standard substance, and performing physical and chemical tests on the standard substance to obtain the following main component substances: 56.1 percent of TFe; siO 2 2 :5.43％；CaO:10.59％；MgO:1.61％；
Step 1b: substituting the chemical component formula of sintered mineral into the main component substance content obtained in step 1a to obtain TFe and SiO carried in by various raw materials 2 Amounts of CaO, mgO, mn:
sinter TFe = sum of TFe carried in by each raw material/total residual amount of combustion;
sintered ore SiO 2 = SiO carried in from various raw materials 2 Sum/total residual amount of combustion;
CaO of sintered ore = sum of CaO brought in by various raw materials/total residual amount of burning;
sintered ore MgO = sum of MgO introduced from various raw materials/total amount of remaining burned;
sinter Mn = sum of Mn brought in by various raw materials/total residual amount of burning;
step 1c: substituting TFe and SiO brought by various raw materials into the raw materials by the following formula 2 And the amount of CaO, mgO and Mn is calculated to obtain the mixing ratio of the raw materials:
TFe = TFe content of the raw material x the raw material ratio in the batch;
SiO = SiO contained in the batch 2 The amount is multiplied by the proportion of the raw materials;
CaO = CaO content of the raw material x the proportion of the raw material;
MgO = MgO content in the batch x the raw material ratio;
mn = Mn content in the raw material x the raw material ratio;
the content of various elements is obtained according to the physical and chemical analysis of the known raw materials, and the content of the auxiliary components is obtained by combining the market price as follows: powder blocking: 23 percent; a, A powder: 10 percent; and (3) poplar powder: 46 percent; and (3) SiC concentrate: 4 percent; ultra-special powder: 5 percent; and (3) preparing the powder of Rake: 4 percent; iron dust mud: 2 percent; b, sieving, namely, sieving: 4 percent; refined plum powder: 2 percent;
wherein the main component and the auxiliary component are combined to determine the chemical components of the uniformly mixed mineral powder.
3. The method for regulating and controlling the operation speed of the sintering machine according to claim 1, wherein in the step 2, the optimization step of the raw material batching zone is as follows:
step 2a: according to the chemical components of the uniformly mixed mineral powder determined in the step 1, the raw material ingredients of the sintered ore are preliminarily estimated according to the mass percentage:
mixing mineral powder uniformly: 55 to 60 percent; 25% -30% of return fines; and (3) combustion agent: 3.6% -4.4%; limestone: 4% -4.3%; dolomite: 4% -4.5%; electric dedusting ash: 3% -4%;
and step 2b: the specific raw material ingredients of the two groups of sintering ores obtained by the high-temperature push plate furnace test are calculated according to the mass percentage:
mixing mineral powder uniformly: 57.03 percent; returning ores: 27%; and (3) combustion agent: 3.75 percent; limestone: 4.5 percent; dolomite: 4.25 percent; dust removal: 2.9 percent;
mixing mineral powder uniformly: 59.22 percent; returning ores: 25 percent; and (3) combustion agent: 3.82 percent; limestone: 4.8 percent; dolomite: 4.4 percent; dust removal: 2.8 percent;
and step 2c: according to the formula for calculating the alkalinity quality of the sinter
The obtained raw material proportioning interval is calculated according to the mass percentage: mixing mineral powder uniformly: 57.31% -59.22%; return mine 25.00Percent-27.19%; and (3) combustion agent: 3.78% -3.82%; limestone: 4.50% -4.75%; dolomite: 4.32% -4.41%; dust removal: 2.80 to 2.90 percent.
4. The method according to claim 1, wherein in step 5, the operation speed of the pallet is controlled by the thickness of the spread material with the ignition condition kept constant, that is, the operation speed per hour is calculated according to the consumption formula S = VHBN p
Wherein:
s: actual consumption, t;
v: the hourly running speed of the sintering machine, m/h, is a dependent variable;
h: the height of the trolley breast board, m, is a variable;
n: the thickness of the bedding material, m, is a constant and is set according to factory parameters of the sintering machine;
ρ: uniformly mixing the mineral powder with the density of kg/m;
wherein the density rho of the uniformly mixed mineral powder is a known quantity according to a density formula
After the nine-roller material distributor distributes materials evenly, a material column with the height of 100mm is randomly taken on the trolley by a steel pipe with the inner diameter of 100mm, and a plurality of groups of samples are randomly extracted to take the average density value.
5. The method for regulating and controlling the operation speed of the sintering machine according to claim 1, characterized in that in step 5, a mathematical model y = -6.804x +7.6136 of the thickness of a material layer and the operation speed of the sintering machine;
wherein, x: material layer thickness, m;
y: the running speed of the sintering machine is m/h;
the running speed of the sintering machine is obtained by giving the corresponding bed thickness.
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