CN111914221A - Process adjustment method for reducing mass percentage of coke with particle size of more than 60mm - Google Patents
Process adjustment method for reducing mass percentage of coke with particle size of more than 60mm Download PDFInfo
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Abstract
The invention discloses an adjusting method for reducing the mass percentage of coke with the granularity of more than 60mm, which has the total moisture content of more than 9 percent in the original coal blending structure and comprises the following steps: 1) establishing a prediction formula of the mass percentage of the coke with the granularity of more than 60 mm; 2) respectively carrying out a coking test and production coking on the raw coal blending structure to obtain the corrected value of the percentage of the coke with the granularity of more than 60mm by using the two methods; 3) giving the percentage of coke with the granularity of more than 60mm which is expected to be controlled in actual production coking after the moisture is adjusted, and calculating to obtain the total moisture M value required after the adjustment; 4) and selecting whether to adjust the water content for coking according to the value of M. The invention can effectively reduce the coke with the granularity of more than 60mm, remove the coke with the granularity of more than 80mm to a greater extent and does not increase the coke with small granularity by adjusting the production process, thereby stabilizing or improving the quality of the coke and having obvious effect on improving the utilization rate of the coke and the air permeability of the blast furnace.
Description
Technical Field
The invention belongs to the technical field of metallurgical coking coal blending, and particularly relates to a process adjustment method for reducing the mass percentage of coke with the granularity larger than 60 mm.
Background
The coke is used as a skeleton of the blast furnace charge column, has important significance for keeping the blast furnace charge column to have good air permeability and liquid permeability in the blast furnace smelting process, and the change of the distribution particle size of the coke has obvious influence on the air permeability of the blast furnace. Proper average coke particle size and narrow particle size distribution are critical to stable and high blast furnace productivity. In order to ensure smooth operation and ventilation of the blast furnace, particularly under the condition of oxygen-enriched coal injection, the particle size of coke must be as uniform as possible, namely, the proportion of the lumpiness of the coke is required to be increased by 40-60 mm.
At present, the particle size distribution of coke is from below 10mm to above 80mm, the particle size distribution range of the coke is very wide, the particle size uniformity is poor, and in order to ensure the air permeability of a blast furnace material column, the coke with smaller particle size is removed by a screening method in the production process and does not enter the blast furnace. The proportion of the coke with the granularity larger than 60mm is influenced by the shape of a coke oven, coal blending, a heating system and the like, and is about 30-45% among enterprises, so that the part of coke directly enters a blast furnace without being treated, and the air permeability and the uniformity of air flow distribution of the blast furnace are influenced due to large granularity; however, if the coke is removed by screening, the utilization rate of the coke is obviously reduced; if the particle size of the coke is reduced by the crushing method, coke with the particle size of less than 25mm which is not beneficial to smooth operation of the blast furnace is generated in the crushing process, and the effective utilization rate of the coke is also reduced. Therefore, the adjustment of the pre-production process of coke to reduce the coke with the granularity of more than 60mm is a method for obviously improving the granularity of the coke. The moisture content of the coal as fired in China is higher, generally about 10%, and some coal as fired are even more than 12%, so that the moisture content is higher. Therefore, the moisture is reduced and reasonably controlled to a certain extent, the dust generation amount is not increased, and compared with the method for reducing the coke granularity through the optimization of the coal blending structure, the method has the advantage that the granularity reduction effect is relatively obvious.
The patent technologies of 'control method of coke granularity uniformity', 'coking and coal blending method for improving coke granularity uniformity coefficient' and the like all achieve the purpose of reasonable material use by adjusting the granularity of single coal with different characteristics, and focus on average granularity.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a process adjustment method for reducing the mass percentage of coke with the granularity of more than 60mm, so as to solve the problems that the moisture of the coal fed into the blast furnace is high (more than 9 percent), the granularity of the coke obtained by metallurgical coal blending and coking is more than 60mm and the coke with the granularity of more than 80mm is too high to be applied in the blast furnace from the source, namely, the process adjustment method is used for greatly reducing the granularity of the coke with the granularity of more than 60mm and removing the granularity of more than 80 mm.
In order to solve the technical problems, the invention adopts the following technical scheme:
1) in the coal preparation process section, the moisture of the coal as fired is reduced, namely the amount of the total water of the coal as fired is reduced (the detection method refers to GB/T211-2007 'determination method of the total moisture in the coal' and the update standard thereof), and the minimum value of the total moisture is not less than 6%. When the moisture of the coal as fired is less than 8 percent, dust prevention and control are needed when the coal as fired is charged in the carbonization chamber.
2) Prediction of moisture impact on coke particle size:
in order to ensure the stable and smooth production and the particle size adjusting effect, the coke particle size can be predicted in a laboratory. The method comprises the following steps:
establishing a prediction formula of the mass percentage of the coke with the granularity of more than 60 mm:
let P60＝k1*M+k2In which P is60Is a percentage value of coke with a particle size of more than 60mm, and the unit is percent, k1Is a regression coefficient of the trend line, k2Is a trend line regression constant;
k1、k2the method comprises the following steps: increasing or decreasing the total moisture of the blended coal based on the original coal blending structure and the total moisture, performing a coking test, detecting at least 4 groups of different total moisture, obtaining the mass percentage of the coke granularity larger than 60mm, performing linear regression on a plurality of groups of different total moisture and corresponding coke granularity percentages larger than 60mm, and obtaining the k in the prediction formula of the coke percentage larger than 60mm1、k2A value of (d); this step is only to obtain the formula and does not directly affect coke quality, as is well known to those skilled in the art for the purpose of data diversification and k1、k2The accuracy of the method is that the full moisture range of the adjusted blended coal is not limited, namely the highest value of the moisture of the coal as fired for the test can be larger than the moisture of the coal as fired for common production, and the lowest value of the moisture can be less than 6%. For convenience, the raw coal blending structure and the total water content thereof can be required to be one group of test numbersAccording to the data, or directly taking a group of data of the production blended coal, and then adjusting the moisture to carry out the coking test.
3) Since the particle size of the test coke is different from that of the actual production coke, and the coefficients and constants of the formula in step 2) are obtained by the test coking, and the production coking is usually the target to be achieved, P is first produced as required60 (other Total moisture production target value)I.e. >60mm particle size coke percentage is converted into the corresponding value P for test coking60Conversion method is P60＝P60 (other Total moisture production target value)+(P60 (raw coal structure test coke detection value)-P60 (raw coal structure coke detection value))，P60 (production target value)Percentage of coke with a particle size >60mm, P, desired to be controlled for practical production coking60 (raw coal structure test coke detection value)Percentage of coke with a particle size of >60mm, P, obtained by trial coking for a raw coal blending structure60 (raw coal structure coke detection value)Percentage of coke with particle size >60mm obtained by production coking for the raw coal blending structure.
4) The moisture reduction process requires: because the moisture of the coal as fired is difficult to adjust accurately and the adjustment of the moisture to the granularity has deviation in production, the adjustment of the moisture is in a range and can be finely adjusted according to the granularity of the coke obtained by production, but the adjustment range does not deviate from the calculated value of the method of the invention by plus or minus 0.5 percent.
5) As the moisture of the coal entering the coke oven is reduced to be beneficial to improving the coke quality, the coke quality does not need to be verified, but the coke pushing is controlled to smoothly protect the oven body of the coke oven, and related control methods are well known to those skilled in the art.
The invention can effectively reduce the coke with the granularity of more than 60mm by adjusting the production process, removes the coke with the granularity of more than 80mm to a greater extent, and does not increase the coke with small granularity, thereby stabilizing or improving the quality of the coke, and having obvious effect on improving the utilization rate of the coke and the air permeability of the blast furnace.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
Example 1
The target requires the production of coke with a particle size of more than 60mm, i.e. P60 (production target value)Up to 38% +/-2 (P because of the significant effect of moisture on particle size60 (production target value)Allowed to have a tolerance of ± 2).
1. And determining whether the original coal blending, namely the produced coal as fired meets the full water requirement of the coal as fired applicable to the invention.
The detection value of the total water of the produced as-fired coal is 11.0 percent and is more than 9 percent, thereby meeting the requirements of the invention.
2. K in the prediction equation to determine the percentage of coke with a particle size >60mm1、k2。
Based on the production of the coal as fired, gradually reducing the total moisture in the coal as fired, carrying out a coking test, detecting the grain size percentage of the coke with the grain size of more than 60mm obtained by carrying out the coking test on 5 groups of coal as fired with different total moisture, and carrying out linear regression on the 5 groups of different total moisture and the corresponding grain size percentage of the coke with the grain size of more than 60mm to obtain the k in the prediction formula for adjusting the grain size percentage of the coke with the grain size of more than 60mm of the coal1、k2。
As shown in the following table:
linear regression is carried out on 5 groups of data to obtain k in a prediction formula of the percentage of coke with the granularity of more than 60mm1、k2The values of the coke particles are 2.6494 and 16.099 respectively, and the prediction formula of the coke particle size obtained by adjusting the total water of the coal as fired is as follows:
P60＝2.6494M+16.099
3. target is the P required for production60And converting the value into a numerical value corresponding to the test coking, and calculating M according to a prediction formula.
According to formula P60＝P60 (production target value)+(P60 (raw coal structure test coke detection value)-P60 (raw coal structure coke detection value)) Obtaining P6038+ (49.4-46.2) ═ 41.2%. Then according to the prediction formula of the mass percentage of the coke with the granularity of more than 60mm, P60When M was found to be 2.6494M +16.099, M was 9.5%. Total water content of 9.5% out of<Can be produced and implemented within the range of 6 percent, and the total moisture of the coal as fired is not in<Within 8 percent, dust prevention and control in the process are not needed.
4. Because the moisture of the coal as fired is difficult to adjust accurately, and the adjustment of the moisture to the granularity has deviation in production, the adjustment of the moisture is in a range, and can be finely adjusted according to the granularity of the coke obtained by production, and the adjustment range is +/-0.5 percentage point, namely 9.5% +/-0.5.
5. A coking test was conducted, and the widthwise shrinkage of coke cake at the lower limit of moisture (9.0%) of the as-fired coal was measured and compared with the widthwise shrinkage of coke cake at the time of production of as-fired coal and the corresponding full water level.
As can be seen from the table, when the moisture content of the coal as fired is adjusted to 9.0 percent of the minimum value, the width direction shrinkage of the coke cake is reduced by 4.2 percent and is not more than 11 percent, and the smoothness of coke pushing of the coke oven is not influenced.
5. The percentage range of coke with the granularity of more than 60mm is produced by coking.
When the production is carried out, the moisture of the coal fed into the furnace is controlled to be 9.5 +/-0.5, and P is60Predicted 38% (moisture: 9.5%) of P actually obtained6036.4-39.2%, and obtaining the product by linear regressionWhen predicting the formula, k is obtained by selecting different total moisture values to carry out a coking test1、k2The values of (A) and (B) can be different, but the moisture regulation according to the obtained formula always ensures that the P obtained by actual coking60At P60 (production target value)In the range of. + -. 2 (38%. + -. 2 in the present embodiment). In addition, in this embodiment, the coke with a grain size of >80mm is reduced from 10.2% before the process adjustment to 4.0%, reduced by about 61%,<the coke content of 25mm particle size is basically consistent with that before the process is adjusted (within 1 percent).
The invention is suitable for the existing top-loading coke oven, can effectively reduce the percentage content of the coke with the particle size distribution of more than 60mm, even obviously reduce the percentage of the coke with the particle size distribution of more than 80mm, and the adjustment process can ensure the stable quality or the improvement of the coke.
Claims (1)
1. An adjusting method for reducing the mass percentage of coke with a granularity of more than 60mm is characterized in that: the method has the advantages that the total moisture content in the original coal blending structure is more than 9 percent, and the method comprises the following steps:
1) establishing a prediction formula of the mass percentage of the coke with the granularity of more than 60 mm:
let P60＝k1*M+k2In which P is60Is composed of>Mass percentage value of 60mm particle size coke, unit is%, k1Is a regression coefficient of the trend line, k2Is a trend line regression constant;
k1、k2the method comprises the following steps: based on the original coal blending structure and the total moisture, increasing or reducing the total moisture of the blended coal, performing a coking test, and detecting at least 4 groups of blended coal with different total moisture to perform the coking test>The mass percentage of the coke granularity of 60mm is that a plurality of groups of different total moisture and corresponding coke granularities are mixed>Performing linear regression on the particle size percentage of the coke with the particle size of 60mm to obtain>K in prediction formula of 60mm particle size coke percentage1、k2A value of (d);
2) respectively carrying out coking test and production coking on the raw coal blending structure to obtain P60 (raw coal structure test coke detection value)And P60 (raw coal structure coke detection value))，P60 (raw coal structure test coke detection value)Obtained by trial coking of raw coal-blending structures>Percentage of 60mm particle size coke, P60 (raw coal structure coke detection value)Obtained by production coking of raw coal-blending structures>Percentage of coke of 60mm particle size;
3) given P60 (adjusted coke production target value)Let P60＝P60 (adjusted coke production target value)+(P60 (raw coal structure test coke detection value)-P60 (raw coal structure coke detection value))，P60 (adjusted coke production target value)Controlled for the actual production of coke after moisture regulation>Percentage of coke of 60mm particle size;
4) combining the formulas of the step 1) and the step 3) and the numerical value of the step 2) to obtain the required total moisture M value after adjustment;
5) according to different values of M, coking is respectively carried out according to the following steps:
51) when M is less than 6%, the method is considered to be incapable of realizing the method, and the adjustment coking is stopped according to the method;
52) when M is more than or equal to 6 and less than 8, adjusting the total moisture according to the M value to coke, and performing dust prevention and control work when the coal as fired is loaded in the coking chamber;
53) and if M is more than or equal to 8, directly adjusting the total moisture according to the M value to carry out coking.
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