CN111914221B - Process adjustment method for reducing mass percentage of coke with granularity of more than 60mm - Google Patents
Process adjustment method for reducing mass percentage of coke with granularity of more than 60mm Download PDFInfo
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Abstract
The invention discloses an adjusting method for reducing mass percentage of coke with granularity of more than 60mm, which comprises the following steps of: 1) Establishing a prediction formula of mass percent of coke with granularity of more than 60 mm; 2) Carrying out coking test and production coking on the original coal blending structure respectively to obtain correction values of the percentage of coke with the granularity of more than 60mm in 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 water content is regulated, and calculating to obtain the required total water content M value after the regulation; 4) And selecting whether to adjust the moisture according to the M value for coking. The invention can effectively reduce the coke with the granularity of more than 60mm by adjusting the production process, remove the coke with the granularity of more than 80mm to a larger extent, and does not increase the coke with the small granularity, thereby stabilizing or improving the quality of the coke, and having obvious effects of improving the utilization rate of the coke and the air permeability of a blast furnace.
Description
Technical Field
The invention belongs to the technical field of metallurgical coking and coal blending, and particularly relates to a process adjustment method for reducing mass percentage of coke with granularity larger than 60 mm.
Background
The coke is taken as a framework of the blast furnace material column, has important significance for keeping good ventilation and liquid permeability of the blast furnace material column in the blast furnace smelting process, and the influence of the change of coke distribution granularity on the blast furnace ventilation is obvious. Proper average particle size and narrow particle size distribution of coke are important for stable and high yield of the blast furnace. To ensure the smooth and breathable operation of the blast furnace, the particle size of the coke must be as uniform as possible, i.e. a proportion of between 40mm and 60mm in bulk must be increased, especially in the case of oxygen-enriched coal injection.
At present, the particle size distribution of the coke is from below 10mm to above 80mm, the range of the particle size distribution of the coke is very wide, the uniformity of the particle size is poor, and in order to ensure the air permeability of a blast furnace charging column, the coke with smaller particle size is removed by a screening method in the production process and cannot enter the blast furnace. The proportion of the coke with the granularity of >60mm is influenced by the oven type of the coke oven, the coal blending, the heating system and the like, and various enterprises have different proportions, about (30-45)%, and the coke directly enters a blast furnace without being treated, so that the air permeability and the air flow distribution uniformity of the blast furnace are influenced due to the larger granularity; however, if the part of coke is removed by screening, the utilization rate of the coke is obviously reduced; if the granularity of the coke is reduced by a crushing method, coke with the granularity of less than 25mm which is unfavorable for the forward running of the blast furnace is also produced in the crushing process, and the effective utilization rate of the coke is also reduced. Therefore, adjusting the pre-coke production process to reduce the coke particle size of >60mm is a significant improvement in coke particle size. The water content of coal in the furnace in China is relatively high, generally about 10%, and some of coal is even more than 12%, and the water content is relatively high. Therefore, the method reduces and reasonably controls the moisture to a certain extent, does not increase the dust generation amount, and has the relatively obvious advantage of reducing the granularity compared with the method for reducing the granularity of the coke through optimizing the coal blending structure.
The patent technologies of a control method for coke granularity uniformity, a coking and coal blending method for improving the coke granularity uniformity coefficient and the like are all that the purpose of reasonable material is achieved by adjusting the granularity of the coke by adjusting the single coal with different characteristics, and the average granularity is focused on.
Disclosure of Invention
The invention aims to solve the technical problem of providing a process adjustment method for reducing the mass percentage of coke with the granularity larger than 60mm, so as to solve the problems of high water content (more than 9%) of coal entering a furnace and the application of coke with the granularity larger than 60mm obtained by metallurgical coal blending coking in a blast furnace, namely, the process adjustment method greatly reduces the coke with the granularity larger than 60mm and removes the coke with the granularity larger 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 water content of the coal to be charged is reduced, namely the total water content of the coal to be charged (the detection method refers to GB/T211-2007 'method for measuring the total water content in coal' and updated standard thereof) is reduced, and the minimum value of the total water content is not suitable to be less than 6 percent. When the moisture of the coal in the furnace is less than 8%, dust prevention and control are needed when the coal in the furnace is charged into the carbonization chamber.
2) Prediction of moisture impact on coke particle size:
in order to ensure stable and smooth production and particle size adjustment effect, the prediction of the coke particle size can be performed in a laboratory. The method comprises the following steps:
establishing a prediction formula of mass percent of coke with granularity of >60 mm:
let P 60 ＝k 1 *M+k 2 Wherein P is 60 Is that>Percentage value of 60mm particle size coke in k 1 As trend line regression coefficient, k 2 Regression constants for trend lines;
k 1 、k 2 the method comprises the following steps: based on the original coal blending structure and total moisture, increasing or reducing the total moisture of the blended coal, performing a coking test, and detecting at least 4 groups of coking tests performed by different total moisture to obtain>Mass percentage of 60mm coke granularity, multiple groups of different total moisture and corresponding>Linear regression of the 60mm coke particle size percentage to obtain>K in prediction formula of 60mm particle size coke percentage 1 、k 2 Is a value of (2); this step is only to obtain the formula, does not directly affect coke quality, and is well known to those skilled in the art for the purpose of data diversification and k 1 、k 2 The full moisture range of the blended coal after adjustment is not limited, namely the highest value of the moisture of the coal in the furnace for test can be larger than the moisture of the coal in the furnace for common production, and the lowest value of the moisture can be less than 6%. For the convenience of metering, the original coal blending structure and the total moisture of the original coal blending structure can be required to be divided into one group of test data, or the production coal blending structure can be directly taken to detect one group of data, and then the moisture is regulated to carry out a coking test.
3) Since the test coke particle size and the actual production coke particle size differ, and the coefficients and constants of the formula in step 2) are derived by test coking, and the goal that is usually achieved is production coking, the production requirement P should be first set 60 (other Total moisture production target value) I.e.>Conversion of 60mm particle size coke percentage to a value P corresponding to test coking 60 The conversion method is P 60 ＝P 60 (other Total moisture production target value) +(P 60 (Coke detection value for raw coal blending Structure test) -P 60 (Coke detection value produced by raw coal blending Structure) )，P 60 (production target value) Control is desired for actual production of coking>Percentage of 60mm particle size coke, P 60 (Coke detection value for raw coal blending Structure test) Obtained by experimental coking of raw coal structures>Percentage of 60mm particle size coke, P 60 (Coke detection value produced by raw coal blending Structure) Obtained by production coking for raw coal structures>Percentage of 60mm particle size coke.
4) The moisture reduction process requires: because the accurate difficulty of adjusting the moisture of the coal entering the furnace is larger, and the deviation exists in the production of the adjustment of the moisture to the granularity, the adjustment of the moisture is in a range, and fine adjustment can be carried out according to the granularity of the coke obtained by production, but the adjustment range does not deviate from the calculated value of +/-0.5 percent of the method.
5) Since the reduction of the moisture of the coal entering the furnace is beneficial to the improvement of the quality of the coke, the verification of the quality of the coke is not needed, but the coke pushing is controlled to smoothly protect the furnace body of the coke furnace, and related control methods are known to the person skilled in the art.
According to the invention, the production process is adjusted, so that the coke with the granularity of more than 60mm can be effectively reduced, the coke with the granularity of more than 80mm is removed to a large extent, and the small-granularity coke is not increased, so that the quality of the coke is stabilized or improved, and the coke utilization rate and the air permeability of a blast furnace are obviously improved.
Detailed Description
The present invention will be described in further detail with reference to the following specific embodiments.
Example 1
Target requirement for coke production>60mm coke particle size mass percent, P 60 (production target value) Up to (38.+ -. 2)% (P because the water content has a significant effect on particle size) 60 (production target value) Errors of + -2) are allowed.
1. And confirming whether the original coal blending, namely the produced coal fed into the furnace meets the full water requirement of the coal fed into the furnace, which is applicable to the invention.
The detection value of the total water of the produced coal into the furnace is 11.0 percent, and the detection value is within the range of more than 9 percent, thereby meeting the requirements of the invention.
2. Determination of>K in prediction formula of 60mm particle size coke percentage 1 、k 2 。
Based on the produced coal, gradually reducing the total moisture in the produced coal, performing a coking test, and detecting 5 groups of coal with different total moisture to obtain the final product>60mm Coke particle size percentage, 5 groups of different total moisture and corresponding>Linear regression is carried out on the granularity percentage of the coke of 60mm to obtain the regulated coal>K in prediction formula of 60mm particle size coke percentage 1 、k 2 。
The following table shows:
subjecting 5 groups of data to linear regression to obtain>K in prediction formula of 60mm particle size coke percentage 1 、k 2 The values of (2) are 2.6494 and 16.099 respectively, and the prediction formula of the coke granularity obtained by adjusting the total water of the coal fed into the furnace is as follows:
P 60 ＝2.6494M+16.099
3. p for the production requirement as the target 60 And converting the obtained product into a numerical value corresponding to the test coking, and obtaining M according to a prediction formula.
According to formula P 60 ＝P 60 (production target value) +(P 60 (Coke detection value for raw coal blending Structure test) -P 60 (Coke detection value produced by raw coal blending Structure) ) Can obtain P 60 =38+ (49.4-46.2) =41.2. According to>Prediction formula of mass percentage of 60 mm-granularity coke, P 60 =2.6494m+16.099, M is found, i.e. M is 9.5. The total moisture content is 9.5%<Within 6% range, canProduction and implementation are carried out, and the total moisture of the coal entering the furnace is not in<In the range of 8%, process dust prevention and control are not needed.
4. Because the accurate difficulty of adjusting the moisture of the coal entering the furnace is large, and the deviation exists in the production of the adjustment of the moisture to the granularity, the adjustment of the moisture is in a range, fine adjustment can be carried out according to the granularity of the coke obtained by production, and the adjustment range is +/-0.5 percent, namely (9.5 +/-0.5)%.
5. A coking test was performed to detect the coke cake width shrinkage of the lower limit (9.0%) of the oven coal conditioning moisture and compare it to the oven coal production and corresponding full water coke cake width shrinkage.
As can be seen from the table, when the moisture of the coal entering the furnace is regulated to the minimum value of 9.0%, the shrinkage of Jiao Bingkuan is reduced by 4.2 percent and is not more than 11 percent, and the smooth pushing of the coke in the coke oven is not affected.
5. Coking produces coke >60mm particle size coke percentage range.
When in production and implementation, the water content of the coal entering the furnace is controlled to be (9.5+/-0.5)%, P 60 Predicted to be 38% (at 9.5% moisture), and actually obtained P 60 When the predictive formula of the invention is obtained by linear regression with the value of (36.4-39.2)%, k is obtained by selecting different total moisture values for coking test 1 、k 2 The values of (2) are different, but the water content is regulated according to the obtained formula, so that the P obtained by actual coking can be always ensured 60 At P 60 (production target value) Within + -2 (in this embodiment, (38 + -2)%). In addition, in the present embodiment, the present invention,>the 80mm granularity coke is reduced from 10.2 percent to 4.0 percent before the process adjustment, is reduced by about 61 percent,<the amount of coke of 25mm particle size was substantially identical (within 1%) to that before adjustment of the process.
The invention is suitable for the existing top-loading coke oven, can effectively reduce the percentage content of coke with the granularity of more than 60mm and even obviously reduce the percentage of coke with the granularity of more than 80mm, and can ensure the stable or improved quality of the coke by the adjusting process.
Claims (1)
1. An adjustment method for reducing mass percentage of coke with granularity of more than 60mm is characterized by comprising the following steps: the method has the total moisture content of more than 9% in the original coal blending structure, and comprises the following steps:
1) Establishing a prediction formula of mass percent of coke with granularity of >60 mm:
let P 60 ＝k 1 *M+k 2 Wherein P is 60 Is that>Mass percent value of 60mm granularity coke, unit is k 1 As trend line regression coefficient, k 2 The regression constant of trend lines, M is the percentage value of the total moisture content of the blended coal, and the unit is;
k 1 、k 2 the method comprises the following steps: based on the original coal blending structure and total moisture, increasing or reducing the total moisture of the blended coal, performing a coking test, and detecting at least 4 groups of different total moisture blended coals to perform the coking test>Mass percentage of 60mm coke granularity, multiple groups of different total moisture and corresponding>Linear regression of the 60mm coke particle size percentage to obtain>K in prediction formula of 60mm particle size coke percentage 1 、k 2 Is a value of (2);
2) The raw coal blending structure is respectively subjected to coking test and production coking to obtain P 60 (Coke detection value for raw coal blending Structure test) And P 60 (Coke detection value produced by raw coal blending Structure) )，P 60 (Coke detection value for raw coal blending Structure test) Obtained by experimental coking of raw coal structures>Percentage of 60mm particle size coke, P 60 (Coke detection value produced by raw coal blending Structure) Obtained by production coking for raw coal structures>Percentage of 60mm particle size coke;
3) Given P 60 (target value for production of coke after adjustment) Let P 60 ＝P 60 (target value for production of coke after adjustment) +(P 60 (Coke detection value for raw coal blending Structure test) -P 60(Coke detection value produced by original coal blending structure )，P 60 (target value for production of coke after adjustment) Control is desired for actual production of coking after moisture conditioning>Percentage of 60mm particle size coke;
4) Combining the formulas of the step 1) and the step 3) with the numerical value of the step 2) to obtain a total moisture M value required after adjustment;
5) According to the difference of M values, coking is carried out according to the following steps:
51 M <6, the adjustment method is considered to be not implemented, and the adjustment coking according to the adjustment method is terminated;
52 6 is less than or equal to M < 8), adjusting the total moisture according to the M value to carry out coking, and preparing dust prevention and control work when the coal into the furnace is charged into the carbonization chamber;
53 M is more than or equal to 8, and the total moisture is directly regulated according to the M value to carry out coking.
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