A differentiated coal blending method suitable for different coke oven types

Abstract

The present invention discloses a differentiated coal blending method applicable to different coke oven types. First, the coke oven type and the corresponding aspect ratio are determined; and the type of coal blending and the corresponding coal characteristic index and its value requirements are determined; the coal characteristic index corresponding to different coal blending is measured; and the empirical formula based on different coal blending is obtained; the fluidity of high-fluidity coal and the weighted fluidity control of all coal types are performed; and then the coke microstructure control and conventional index control are performed, and finally the coal blending scheme applicable to different coke oven types is obtained. The present invention aims at the difference in aspect ratio of coke ovens of different types, and according to the aspect ratio, weighted control of coal types with higher fluidity, weighted control of all coal types, coke microstructure control and other means are formulated, and different coal blending structures are implemented for different types of furnaces, and differentiated coal blending is achieved; resources can be fully and reasonably utilized, the cost of coal blending can be reduced, and high-strength coke can be obtained, which has important economic and environmental benefits.

Description

Technical Field

[0001] The invention belongs to the technical field of coal blending for coking, and in particular relates to a differentiated coal blending method suitable for different coke oven types. Background Art

[0002] With the continuous development of my country's steel industry, the large-scale blast furnaces, the gradual increase in coal injection ratio, the shortage of high-quality coking coal, and the increasingly stringent environmental protection requirements have increased the requirements for coking technology and the demand and quality of coke, thereby promoting the development and application of large-volume coke ovens.

[0003] The length, width and height of the coke oven carbonization chamber are gradually increased, and the corresponding volume is constantly increasing. At present, the top-loading coke ovens of large domestic steel enterprises are usually 6-meter coke ovens, 7-meter coke ovens and 7.63-meter coke ovens. The height and width of the coke oven carbonization chambers of different types of furnaces vary greatly, and there are large differences in coal blending resources and methods. Usually, the coke produced by the 7.63-meter coke oven is suitable for blast furnaces with larger volumes, and the requirements for strong sticky coal are higher. Patent CN101624527A discloses a method for starting up a 7.63-meter coke oven. It is mainly aimed at ensuring smooth coke pushing and protecting the furnace wall from damage during the start-up period as the first factor, and the quality of coke is considered as the second factor. The coal blending scheme must have smaller expansion and larger contraction, and the quality must be maintained at a certain level; Patent CN102010735A discloses a method for controlling the shrinkage of coal entering a super-large wide carbonization chamber coke oven, which is also a control method for controlling the shrinkage of coal blending for a wide carbonization chamber coke oven; it also does not involve differentiated coal blending methods for different coke ovens.

[0004] Coking coal resources are becoming increasingly scarce. In order to fully and rationally utilize coking coal resources and meet the demand of 3000-4000m3 blast furnaces, it is of great research and application significance to further explore and develop differentiated coal blending methods based on the characteristics of different coke oven types. Summary of the invention

[0005] The main purpose of the present invention is to provide a differentiated coal blending method suitable for different coke oven types, which can reduce the coal blending cost and optimize the coal blending to produce high-strength coke by rationally utilizing resources. The crushing strength of the obtained coke reaches M 40 >88.0%,M 10 <6.0%, CSR>68.5%, coke quality meets 3000m 3 The above is required for blast furnaces; it can provide a new idea for alleviating the increasingly scarce coking coal resources and other problems, and has important economic and environmental benefits.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A differentiated coal blending method applicable to different coke oven types comprises the following steps:

[0008] 1) Determine the coke oven type and the corresponding aspect ratio H / B; determine the type of coal blending and the corresponding coal characteristic index and its value characteristics; the coal characteristic index includes G value (bonding index), Y value (colloid layer index), Vdaf (coal volatile matter), fluidity MF, coarse grain mosaic content, fiber, flaky and isotropic structure content or more;

[0009] 2) Measure the coal characteristic indicators corresponding to different coal blends; and obtain empirical formulas based on different coal blends;

[0010] 3) Control the fluidity of high fluidity coal with fluidity MF≥1000ddpm. The specific control steps are as follows;

[0011] According to the measurement results obtained in step 2), the coal types with MF ≥ 1000 ddpm are obtained, and then the content X of different coal types in the empirical formula is calculated. 0 , the logarithmic function of the fluidity of the corresponding coal type is added and calculated to obtain the summed logarithmic function lgMF of the coal type with high fluidity 控 , and adjust the content of high fluidity coal according to the aspect ratio characteristics of the coke oven type 1 Until the H / B is 13.96~15.51, the lgMF 控 When H / B is 13.33~13.69, its lgMF 控 When H / B is 12.65~13.2, its lgMF 控 Controlled to 1.2~1.5;

[0012] Among them, the coal types with Vdaf ≥ 33% ​​further introduce the correction coefficient K' for summation calculation;

[0013] 4) Weighted mobility control for all coal types;

[0014] Weighted fluidity control is performed on all coal types, and the content of different coal types in the formula obtained by step 3) is adjusted. 1 , weighted calculation is performed on the logarithmic function of the fluidity of the corresponding coal type to obtain the weighted logarithmic function of the total coal blending lgMF 总 ; and adjust the content X according to the aspect ratio characteristics of the coke oven type 2 Until the H / B is 13.96~15.51, the lgMF 总 When H / B is 13.33~13.69, its lgMF 总 When H / B is 12.65~13.2, its lgMF 总 Controlled to 2.45~2.7;

[0015] Among them, the coal with volatile matter (Vdaf) greater than 33% is further introduced with correction coefficient K” for weighted calculation;

[0016] 5) Control of the microstructure of coke: According to the control result obtained in step 4), the microstructure of coke is controlled according to the aspect ratio of the coke oven type. The specific control requirements are as follows:

[0017] When H / B is 13.96~15.51, the coarse-grained mosaic content is ≥32%, and the fiber, lamellar and isotropic structure content is <9%;

[0018] When H / B is 13.33~13.69, the coarse-grained mosaic content is ≥32%, and the fiber, lamellar and isotropic structure content is <9%;

[0019] When H / B is 12.65-13.2, the coarse-grained mosaic content is ≥34%, and the fiber, lamellar and isotropic structure content is <9.5%;

[0020] 6) Conventional index control: The volatile matter Vdaf of the blended coal is <27.5%, the G value is 79~83, and the Y value is 15~17mm.

[0021] Finally, a coal blending scheme suitable for different coke oven types is obtained.

[0022] In the above scheme, the coke oven types include 6-meter coke oven, 7-meter coke oven and 7.63-meter coke oven; the corresponding specifications and aspect ratio characteristics are as follows:

[0023] 6m coke oven: the carbonization chamber is 6m high and 0.45m wide; the height-to-width ratio H / B is 13.33;

[0024] 7m coke oven: carbonization chamber is 6.98m high and 0.50m wide; height-to-width ratio H / B is 13.96;

[0025] 7.63m coke oven: The carbonization chamber is 7.63m high and 0.59m wide; the height-to-width ratio H / B is 12.93.

[0026] In the above scheme, the types of coal blending include gas coal, gas fat coal, fat coal, 1 / 3 coking coal, coking coal and lean coal; and the coal type characteristic index requirements corresponding to different types of coal blending include the following:

[0027] 1) Gas coal: G value>80, isotropic structure content ≤10%;

[0028] 2) Gas-fertilizer coal: Y value>25mm, fluidity MF 气肥煤 ≥20000ddpm;

[0029] 3) Fat coal is divided into fat coal 1#, fat coal 2# and fat coal 3# according to the value conditions of coal volatile matter and fluidity MF. The corresponding coal characteristic index requirements include the following:

[0030] Fat coal 1#: Vdaf28~33%, Y value>25mm, fluidity MF 肥煤1 <10000ddpm;

[0031] Fat coal 2#: Vdaf28~33%, Y value>25mm, fluidity MF 肥煤2 ≥10000 ddpm;

[0032] Fat coal 3#: Vdaf33~36%, Y value>25mm, fluidity MF 肥煤3 ≥10000 ddpm;

[0033] 4) 1 / 3 coking coal is divided into 1 / 3 coking coal 1# and 1 / 3 coking coal 2# according to the value of fluidity MF. The corresponding coal characteristic index requirements include the following:

[0034] 1 / 3 coking coal 1#: Vdaf≤32%, G value≥85, fluidity MF 1 / 3焦1 ≥1000ddpm.

[0035] 1 / 3 coking coal 2#: Vdaf≤32%, fluidity MF 1 / 3焦2 <1000 ddpm;

[0036] 5) Coking coal is divided into coking coal 1#, coking coal 2# and coking coal 3# according to the value conditions of coarse-grained mosaic content and fluidity MF. The corresponding coal characteristic index requirements include the following:

[0037] Coking coal 1#: Vdaf 18~28%, G value ≥80, coarse grain mosaic content ≥55%, fluidity MF 焦1 ≥1000 ddpm;

[0038] Coking coal 2#: Vdaf 18~28%, G value ≥80, coarse grain mosaic content ≥55%, fluidity MF 焦2 <1000 ddpm;

[0039] Coking coal 3#: Vdaf 18~28%, G value ≥80, coarse grain mosaic content 48~55%, fluidity MF 焦3 <1000 ddpm;

[0040] 6) Lean coal: G value>30, fiber and flaky structure content<50%.

[0041] In the above scheme, the components and their contents in the empirical formula in step 2) are 0 (mass percentage) includes: gas coal 0~15% (X0 气煤 ), gas fertilizer coal 0~10% (X 0 气肥煤 ), fat coal 1# 0~20% (X 0 肥煤1# ), fat coal 2# 0~25% (X 0 肥煤2# ), fat coal 3#0~20% (X 0 肥煤3# ), 1 / 3 coking coal 1# 0~15% (X 0 1 / 3焦煤1# ), 1 / 3 coking coal 2# 3~10% (X 0 1 / 3焦煤2# ), coking coal 1# 0~15% (X 0 焦煤1# ), coking coal 2# 18~25% (X 0 焦煤2# ), coking coal 3#10~20% (X 0 焦煤3# ), lean coal 10~15% (X 0 瘦煤 ).

[0042] In the above scheme, the high-mobility coal types with a fluidity MF ≥ 1000 ddpm in step 3) include gas fat coal, fat coal 1#, fat coal 2#, fat coal 3#, 1 / 3 coking coal 1# and coking coal 1#; the corresponding lgMF 控 The calculation method is shown in Formula I;

[0043] lgMF 控 =∑(K ’ 气肥 ×X 0 气肥 ×lgMF 气肥 +X 0 肥1 ×lgMF 肥1 +X 0 肥2 ×lgMF 肥2 +K ’ 肥3 ×X 0 肥3 ×lgMF 肥3 +X 0 1 / 3焦1 ×lgMF 1 / 3焦1 +X 0 焦1 ×lgMF 焦1 );(I);

[0044] In the formula, the logarithm of the fluidity of gas fertilizer coal is lgMF 气肥 , the ratio is recorded as X0 气肥 , Correction coefficient K ’ 气肥 ; The fluidity of H2O1 is recorded as lgMF 肥1 , the ratio is recorded as X 0 肥1 ; Logarithm of fluidity of fat coal 2# is lgMF 肥2 , the ratio is recorded as X 0 肥2 ; Logarithm of fluidity of fat coal 3# is lgMF 肥3 , the ratio is recorded as X 0 肥3 , correction factor K ’ 肥3 ; 1 / 3 coking coal 1# fluidity logarithm is recorded as lgMF 1 / 3焦1 , the ratio is recorded as X 0 1 / 3焦1 ; The logarithm of the fluidity of coking coal No. 1 is lgMF 焦1 , the ratio is recorded as X 0 焦1 .

[0045] In the above scheme, the correction coefficient K in step 3) ’ 气肥 The value is 0.5~0.6; correction coefficient K ’ 肥3 The value is 0.85~0.95; it is obtained based on the maximum replacement amount of gas fat coal and fat coal 3# to fat coal with volatile matter of 30~32% and fluidity of 10000~15000ddpm and the fat coal ratio. For example, for fat coal with fluidity of 10000ddpm, its ratio in coal blending is 16%. In order to save coal blending costs, gas fat coal can be used to replace part of fat coal. Under the premise of stable coke quality, the maximum replacement amount of gas fat coal is 8%, K=maximum replacement amount of gas fat coal / original fat coal ratio=0.5.

[0046] In the above scheme, the coal types with volatile matter greater than 33% in step 4) include gas coal, gas fat coal, and fat coal 3#, and the weighted logarithmic function lgMF of the total blended coal is 总 The calculation method is shown in Formula II (lean coal has no fluidity and is not considered);

[0047] lgMF 总 =∑(K') 气 ×X 气 ×lgMF 气 +K” 气肥 ×X 气肥 ×lgMF 气肥 +X 肥1 ×lgMF 肥1 +X 肥2 ×lgMF 肥2 +K” 肥3×X 肥3 ×lgMF 肥3 +X 焦1 ×lgMF 焦1 +X 焦2 ×lgMF 焦2 +X 焦3 ×lgMF 焦3 +X 1 / 3焦1 ×lgMF 1 / 3焦1 +X 1 / 3焦2 ×lgMF 1 / 3焦2 )(II).

[0048] In the above scheme, the correction coefficient K" 气肥 The value is 0.5~0.6; correction coefficient K" 肥3 The value is 0.85~0.95; it is obtained based on the maximum replacement amount of gas-fertilizer coal and fertilizer 3 for volatile matter 30~32% and fluidity of about 10000ddpm and the ratio of fertilizer coal. Correction coefficient K" 气 The value is 0.5~0.6, which is obtained based on the maximum replacement amount of gas coal for 1 / 3 coal with a volatile matter of 30~32% and a fluidity of about 1000ddpm and the ratio of 1 / 3 coal.

[0049] In the above scheme, in step 5), the corresponding coarse-grained mosaic content, fiber, lamellar content and isotropic structure content are weighted according to the formula control results obtained in step 4) and the composition characteristics of the blended coal to further control the formula conditions; only the corresponding control requirements of 1), 3), 4), 5) and 6) are met at the same time.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] 1) The present invention aims at the difference in aspect ratio of coke ovens of different types, formulates weighted control of coal types with higher fluidity according to aspect ratio, weighted control of all coal types, and control principle of coke microstructure, so as to realize different coal blending structures and differentiated coal blending for different types of coke ovens; it can make full and reasonable use of resources, reduce coal blending costs, and has important economic and environmental benefits;

[0052] 2) The coal blending method of the present invention can optimize the production of high-strength coke, and the dry quenched coke M obtained from coke ovens of different furnace types can be optimized. 40 >88.0%,M 10 <6.0%, CSR>68.5%, coke quality meets 3000-4000m 3 Required for the above blast furnaces. DETAILED DESCRIPTION

[0053] The present invention is not limited to the above-mentioned embodiments. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0054] Example 1

[0055] A differentiated coal blending method for different coke oven types specifically comprises the following steps:

[0056] 1) Determine the coke oven type and the corresponding aspect ratio H / B; determine the type of coal blending and the corresponding coal characteristic indicators and their value characteristics; the details are as follows:

[0057] 1-1) A coking plant has 6-meter coke ovens, 7-meter coke ovens and 7.63-meter coke ovens. The three types of coke ovens and their corresponding specifications are as follows:

[0058] 6m coke oven: the carbonization chamber is 6m high and 0.45m wide, with a height-to-width ratio H / B of 13.33;

[0059] 7m coke oven: the carbonization chamber is 6.98m high and 0.50m wide, with a height-to-width ratio H / B of 13.96;

[0060] 7.63m coke oven: The carbonization chamber is 7.63m high and 0.59m wide, with a height-to-width ratio H / B of 12.93;

[0061] 1-2) The types of coal blending include gas coal, gas fat coal, fat coal, 1 / 3 coking coal, coking coal and lean coal; and the coal characteristic index requirements corresponding to different types of coal blending include the following:

[0062] Gas coal: G value>80; isotropic structure ≤10%;

[0063] Gas fertilizer coal: Y value>25mm, fluidity MF 气肥煤 ≥20000ddpm;

[0064] Fat coal is divided into fat coal 1#, fat coal 2# and fat coal 3# according to the value conditions of coal volatile matter and fluidity MF. The corresponding coal characteristic index requirements include the following:

[0065] Fat coal 1#: Vdaf28~33%, Y value>25mm, fluidity MF 肥煤1 <10000ddpm;

[0066] Fat coal 2#: Vdaf28~33%, Y value>25mm, fluidity MF 肥煤2 ≥10000 ddpm;

[0067] Fat coal 3#: Vdaf33~36%, Y value>25mm, fluidity MF 肥煤3 ≥10000 ddpm;

[0068] 1 / 3 coking coal is divided into 1 / 3 coking coal 1# and 1 / 3 coking coal 2# according to the value of fluidity MF. The corresponding coal characteristic index requirements include the following:

[0069] 1 / 3 coking coal 1#: Vdaf≤32%, G value≥85, fluidity MF 1 / 3焦1 ≥1000 ddpm;

[0070] 1 / 3 coking coal 2#: Vdaf≤32%, fluidity MF 1 / 3焦2 <1000 ddpm;

[0071] Coking coal is divided into coking coal 1#, coking coal 2# and coking coal 3# according to the conditions of coarse-grained mosaic and fluidity MF. The corresponding coal characteristic index requirements include the following:

[0072] Coking coal 1#: Vdaf 18~28%; G value ≥80, coarse grain embedding ≥55%, fluidity MF 焦1 ≥1000ddpm.

[0073] Coking coal 2#: Vdaf 18~28%; G value ≥80, coarse grain embedding ≥55%, fluidity MF 焦2 <1000 ddpm.

[0074] Coking coal 3#: Vdaf 18~28%; G value ≥80, coarse grain embedding 48~55%, fluidity MF 焦3 <1000 ddpm.

[0075] Lean coal: G value>30;

[0076] 2) The coking plant has 11 subdivided coal types, including gas coal, gas fat coal, 1 / 3 coke 1#, 1 / 3 coke 2#, fat coal 1#, fat coal 2#, fat coal 3#, coking coal 1#, coking 2#, coking coal 3#, and lean coal. The coal quality (coal characteristic indicators) analysis data of each coal type are shown in Table 1;

[0077] Table 1 Coal quality test results of different coal blends

[0078]

[0079] And obtain the empirical formula of coal blending based on different types of coke ovens, specifically: X 0 气煤 0~15%,X 0 气肥煤 0~10%,X 0 肥煤1# 0~20%,X0 肥煤2# 0~25%,X 0 肥煤3# 0~20%,X 0 1 / 3焦煤1# 0~15%,X 0 1 / 3焦煤2# 3~10%,X 0 焦煤1# 0~15%,X 0 焦煤2# 18~25%, X 0 焦煤3# 10~20%, X 0 瘦煤# 10~15%;

[0080] 3) As can be seen from Table 1, gas fat coal and fat coal 3# have high volatile content and poor colloid stability, so their colloid is corrected, and the correction coefficient of gas coal is set as K 气煤 =0.6 (based on the ratio of 1 / 3 of the maximum replacement of coking coal with volatile matter of 30-32% and fluidity of about 1000 ddpm and 1 / 3 of the coking coal); correction coefficient K for gas fertilizer coal 气肥煤 The correction factor K of high volatile fertilizer coal 3# is 0.6. 肥3 It is 0.95 (based on the maximum replacement amount of gas-fertilizer coal and fertilizer 3 for volatile matter 30-32% and fluidity of about 10000ddpm and the ratio of fertilizer coal). The specific correction steps are as follows:

[0081] According to the measurement results obtained in step 2), the coal blending with MF ≥ 1000 ddpm is obtained, and then the content X of different coal blending in the empirical formula is calculated. 0 , the logarithmic function of the fluidity of the corresponding coal is added and calculated to obtain the logarithmic function of the large fluidity coal type lgMF 控 , and adjust the content of high fluidity coal according to the aspect ratio characteristics of the coke oven type 1 Until it meets: H / B of 7m coke oven 7米 The maximum value is 13.96, and its lgMF 控 Controlled to 0.9~1.3; H / B of 6m coke oven 6米 The second value is 13.33, and its lgMF 控 Controlled to 1.0~1.4; H / B of 7.63m coke oven 7.63米 The minimum value is 12.93, and its lgMF 控 Controlled to 1.2~1.5;

[0082] Logarithmic function lgMF of high mobility coal 控 The calculation method of is shown in Formula I;

[0083] lgMF控 =∑(K ’ 气肥 ×X 0 气肥 ×lgMF 气肥 +X 0 肥1 ×lgMF 肥1 +X 0 肥2 ×lgMF 肥2 +K ’ 肥3 ×X 0 肥3 ×lgMF 肥3+ X 0 1 / 3焦1 ×lgMF 1 / 3焦1 +X 0 焦1 ×lgMF 焦1 );(I);

[0084] In this step, coal with high fluidity is used as much as possible in coke ovens with small aspect ratio H / B, especially fat coal; coal with low fluidity is used in coke ovens with high aspect ratio H / B; for example, fat coal 2# and fat coal 3# are used in 7.63m coke ovens, while gas fat coal and fat coal 1# are used in 7m coke ovens. The content information of coal with high fluidity is controlled as follows:

[0085] H / B 7米： X 1 气肥煤 3~6%,X 1 肥煤1# 3~20%, X 1 1 / 3焦煤1# 5~14%, X 1 焦煤1# 0~15%;

[0086] H / B 6米： X 1 气肥煤 3~6%,X 1 肥煤2# 6~22%, X 1 1 / 3焦煤1# 5~15%, X 1 焦煤1# 0~15%;

[0087] H / B7.63 米： X 1 肥煤2# 8~25%, X 1 肥煤3# 5~20%, X 1 1 / 3焦煤1# 8~15%, X 1焦煤1# 0~15%;

[0088] 4) Weighted fluidity of all coal types (the fluidity of coal types with volatile matter higher than 33% needs to be corrected, gas coal, gas fat coal, high volatile fat coal, and lean coal have no fluidity and are not taken into account. The correction coefficient K for gas coal and gas fat coal is 气煤 , K 气肥 The correction factor K of high volatile fertilizer coal 3# is 0.6. 肥3 is 0.95);

[0089] lgMF 总 =∑(K 气 ×X 气 ×lgMF 气 +K 气肥 ×X 气肥 ×lgMF 气肥 +X 肥1 ×lgMF 肥1 +X 肥2 ×lgMF 肥2 +K 肥3 ×X 肥3 ×lgMF 肥3 +X 焦1 ×lgMF 焦1 +X 焦2 ×lgMF 焦2 +X 焦3 ×lgMF 焦3 +X 1 / 3焦1 ×lgMF 1 / 3焦1 +X 1 / 3焦2 ×lgMF 1 / 3焦2 ); (II);

[0090] H / B of 7m coke oven 7米 The maximum value is 13.96, and its lgMF 总 : 2.25~2.6; H / B of 6m coke oven 6米 The second value is 13.33, and its lgMF 总 : 2.3~2.65; H / B of 7.63m coke oven 7.63米 The minimum value is 12.93, and its lgMF 总 : 2.45~2.7; the formula obtained by adjustment includes the following:

[0091] H / B 7米 :X 2 气煤 5~15%, X 2 气肥煤 3~6%,X 2 肥煤1# 3~20%, X 2 1 / 3焦煤1# 5~14%, X2 1 / 3焦煤2# 3~8%,X 2 焦煤1# 0~15%,X 2 焦煤2# 18~25%, X 2 焦煤3# 10~20%, X 2 瘦煤# 10~15%;

[0092] H / B 6米 :X 2 气煤 5~15%, X 2 气肥煤 3~6%,X 2 肥煤2# 6~22%, X 2 1 / 3焦煤1# 5~15%, X 2 1 / 3焦煤2# 3~8%,X 2 焦煤1# 0~15%,X 2 焦煤2# 18~25%, X 2 焦煤3# 10~20%, X 2 瘦煤# 10~15%

[0093] H / B 7.63米 :X 2 气煤 5~15%, X 2 肥煤2# 8~25%, X 2 肥煤3# 5~20%, X 2 1 / 3焦煤1# 8~15%, X 2 1 / 3焦煤2# 3~8%,X 2 焦煤1# 0~15%,X 2 焦煤2# 18~25%, X 2 焦煤3# 10~20%, X 2 瘦煤# 10~15%;

[0094] 5) Coke microstructure control:

[0095] According to the control results obtained in step 4), the microstructure of the coke is controlled according to the aspect ratio of the coke oven type. The specific control requirements are as follows:

[0096] Aspect ratio H / B 7米Maximum: Its coarse grain control is ≥32%, and the fiber flake and isomorphous structure is <9%;

[0097] Aspect ratio H / B6m Next: Its coarse grain control is ≥32%, and fiber flake and isotropic structure is <9%;

[0098] The minimum aspect ratio H / B is 7.63 meters: the coarse particles are controlled ≥34%, and the fibrous flake and isotropic structures are <9.5%.

[0099] The coarse-grained inlay of the 7.63-meter coke oven is slightly higher, so more coking coal is needed.

[0100] 6) Conventional index control: volatile matter of coal blending Vdaf <27.5%, G value 79~83, Y value: 15~17mm.

[0101] According to the corresponding control methods of steps 1), 3), 4), 5) and 6), a specific coal blending structure is obtained as shown in Table 2; the corresponding coal blending composition and coke quality test results are shown in Table 3.

[0102] Table 2 Differentiated coal blending schemes for three types of furnaces

[0103]

[0104] Table 3 Volatile matter and coke quality of coal blending

[0105]

[0106] In this plan, gaseous fertilizer coal is used in 6-meter and 7-meter coke ovens, high-volatile fertilizer coal is used in 7.63-meter coke ovens, high-flowability coal is rarely used in 6-meter and 7-meter coke ovens and is mainly used in 7.63-meter coke ovens. The total amount of coking coal used is the lowest in 7-meter coke ovens and the highest in 7.63-meter coke ovens.

[0107] Comparative Example 1

[0108] A differentiated coal blending method for different coke oven types. The specific coal blending scheme is shown in Table 4, and the obtained coal blending components and coke test results are shown in Table 5.

[0109] Table 4 Differentiated coal blending schemes for three types of furnaces

[0110]

[0111] Table 5 Volatile matter of coal blending and coke quality

[0112]

[0113] It can be seen from Tables 4 and 5 that the control ratio does not meet the control requirements due to the higher fluidity coal, the coarse-grained mosaic structure is low, which affects the cold and hot strength of the coke, and the cold and hot strength of the coke does not meet the requirements.

[0114] The present invention is not limited to the above-mentioned embodiments. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A differentiated coal blending method suitable for different coke oven types, characterized in that: The steps include: 1) Determine the coke oven type and the corresponding aspect ratio H / B; determine the type of coal blending and the corresponding coal characteristic indicators and their value requirements; the coal characteristic indicators include the bonding index G value, the gelatin layer index Y value, the coal volatile matter Vdaf, the fluidity MF, the coarse-grained mosaic content, and one or more of the fiber, flaky and isotropic structure contents; 2) Measure the coal characteristic indicators corresponding to different coal blends; and obtain empirical formulas based on different coal blends; 3) Control the fluidity of high fluidity coal with fluidity MF≥1000ddpm. The specific control steps are as follows; According to the measurement results obtained in step 2), the coal types with MF ≥ 1000 ddpm are obtained, and then the content X of different coal types in the empirical formula is calculated. 0 , the logarithmic function of the fluidity of the corresponding coal type is added and calculated to obtain the summed logarithmic function lgMF of the coal type with high fluidity 控 , and adjust the content of high fluidity coal according to the aspect ratio characteristics of the coke oven type 1 Until the H / B is 13.96~15.51, the lgMF 控 When H / B is 13.33~13.69, its lgMF 控 When H / B is 12.65~13.2, its lgMF 控 Controlled to 1.2~1.5; Among them, the coal types with Vdaf ≥ 33% ​​further introduce the correction coefficient K' for summation calculation; 4) Weighted mobility control for all coal types; Weighted fluidity control is performed on all coal types, and the content of high fluidity coal types in the formula obtained by step 3) is adjusted. 1 , weighted calculation is performed on the logarithmic function of the fluidity of the corresponding coal type to obtain the weighted logarithmic function of the total coal blending lgMF 总 ; and adjust the content X according to the aspect ratio characteristics of the coke oven type 2 Until the H / B is 13.96~15.51, the lgMF 总 When H / B is 13.33~13.69, its lgMF 总 When H / B is 12.65~13.2, its lgMF 总 Controlled to 2.45~2.7; Among them, the coal types with Vdaf greater than 33% are further introduced with correction coefficient K” for weighted calculation; 5) Controlling the microstructure of the coke: According to the control result obtained in step 4), the microstructure of the coke is controlled according to the aspect ratio of the coke oven type; 6) Conventional index control: Vdaf of coal blending is less than 27.5%, G value is 79~83, and Y value is 15~17mm; Finally, a coal blending scheme suitable for different coke oven types is obtained; Step 3) Medium fluidity MF ≥ 1000 ddpm High fluidity coal types include gas fat coal, fat coal 1#, fat coal 2#, fat coal 3#, 1 / 3 coking coal 1# and coking coal 1#; the corresponding lgMF 控 The calculation method is shown in Formula I; lgMF 控 =∑(K ’ 气肥 ×X 0 气肥 ×lgMF 气肥 +X 0 肥1 ×lgMF 肥1 +X 0 肥2 ×lgMF 肥2 +K ’ 肥3 ×X 0 肥3 ×lgMF 肥3 +X 0 1 / 3焦1 ×lgMF 1 / 3焦1 +X 0 焦1 ×lgMF 焦1 );(IN); In the formula, the logarithm of the fluidity of gas fertilizer coal is lgMF 气肥 , the ratio is recorded as X 0 气肥 , Correction coefficient K ’ 气肥 ; The fluidity of fat coal 1# is recorded as lgMF 肥1 , the ratio is recorded as X 0 肥1 ; Logarithm of fluidity of fat coal 2# is lgMF 肥2 , the ratio is recorded as X 0 肥2 ; Logarithm of fluidity of fat coal 3# is lgMF 肥3 , the ratio is recorded as X 0 肥3 , correction factor K ’ 肥3 ; 1 / 3 coking coal 1# fluidity logarithm is recorded as lgMF 1 / 3焦1 , the ratio is recorded as X 0 1 / 3焦1 ; The logarithm of the fluidity of coking coal No. 1 is lgMF 焦1 , the ratio is recorded as X 0 焦1 ; In step 4), the coal types with volatile matter greater than 33% include gas coal, gas fat coal, and fat coal 3#. The weighted logarithmic function of the total blended coal is lgMF 总 The calculation method of is shown in Formula II; lgMF 总 =∑(K” 气 ×X 1 气 ×lgMF 气 +K” 气肥 ×X 1 气肥 ×lgMF 气肥 +X 1 肥1 ×lgMF 肥1 +X 1 肥2 ×lgMF 肥2 +K” 肥3 ×X 1 肥3 ×lgMF 肥3 +X 1 焦1 ×lgMF 焦1 +X 1 焦2 ×lgMF 焦2 +X 1 焦3 ×lgMF 焦3 +X 1 1 / 3焦1 ×lgMF 1 / 3焦1 +X 1 1 / 3焦2 ×lgMF 1 / 3焦2 )(II); The specific control requirements of the coke microstructure control step in step 5) are as follows: When H / B is 13.96~15.51, the coarse-grained mosaic content is ≥32%, and the fiber, lamellar and isotropic structure content is <9%; When H / B is 13.33~13.69, the coarse-grained mosaic content is ≥32%, and the fiber, lamellar and isotropic structure content is <9%; When H / B is between 12.65 and 13.2, the coarse-grained mosaic content is regulated to be ≥34%, and the fiber, lamellar and isotropic structure content is regulated to be <9.5%.

2. The differentiated coal blending method according to claim 1, characterized in that: The coke oven types include 6-meter coke oven, 7-meter coke oven and 7.63-meter coke oven.

3. The differentiated coal blending method according to claim 1, characterized in that: The types of coal blending include gas coal, gas fat coal, fat coal, 1 / 3 coking coal, coking coal and lean coal; and the coal type characteristic index requirements corresponding to different types of coal blending include the following: 1) Gas coal: G value>80, isotropic structure content ≤10%; 2) Gas-fertilizer coal: Y value>25mm, fluidity MF 气肥煤 ≥20000ddpm; 3) Fat coal is divided into fat coal 1#, fat coal 2# and fat coal 3# according to the value conditions of coal volatile matter and fluidity MF. The corresponding coal characteristic index requirements include the following: Fat coal 1#: Vdaf28~33%, Y value>25mm, fluidity MF 肥煤1 <10000ddpm; Fat coal 2#: Vdaf28~33%, Y value>25mm, fluidity MF 肥煤2 ≥10000 ddpm; Fat coal 3#: Vdaf33~36%, Y value>25mm, fluidity MF 肥煤3 ≥10000 ddpm; 4) 1 / 3 coking coal is divided into 1 / 3 coking coal 1# and 1 / 3 coking coal 2# according to the value of fluidity MF. The corresponding coal characteristic index requirements include the following: 1 / 3 coking coal 1#: Vdaf≤32%, G value≥85, fluidity MF 1 / 3焦1 ≥1000 ddpm; 1 / 3 coking coal 2#: Vdaf≤32%, fluidity MF 1 / 3焦2 <1000 ddpm; 5) Coking coal is divided into coking coal 1#, coking coal 2# and coking coal 3# according to the value conditions of coarse-grained mosaic content and fluidity MF. The corresponding coal characteristic index requirements include the following: Coking coal 1#: Vdaf 18~28%, G value ≥80, coarse grain mosaic content ≥55%, fluidity MF 焦1 ≥1000 ddpm; Coking coal 2#: Vdaf 18~28%, G value ≥80, coarse grain mosaic content ≥55%, fluidity MF 焦2 <1000 ddpm; Coking coal 3#: Vdaf 18~28%, G value ≥80, coarse grain mosaic content 48~55%, fluidity MF 焦3 <1000 ddpm; 6) Lean coal: G value>30, fiber and flaky structure content<50%.

4. The differentiated coal blending method according to claim 1, characterized in that: Step 2) The components and their contents in the empirical formula X 0 Including: gas coal 0~15%, gas fat coal 0~10%, fat coal 1# 0~20%, fat coal 2# 0~25%, fat coal 3# 0~20%, 1 / 3 coking coal 1# 0~15%, 1 / 3 coking coal 2# 3~10%, coking coal 1# 0~15%, coking coal 2# 18~25%, coking coal 3# 10~20%, lean coal 10~15%.

5. The differentiated coal blending method according to claim 1, characterized in that: The correction factor K mentioned in step 3) ’ 气肥 The value is 0.5~0.6; correction coefficient K ’ 肥3 The value ranges from 0.85 to 0.

95.

6. The differentiated coal blending method according to claim 1, characterized in that: The correction factor K" 气肥 and K” 气 The value is 0.5~0.6; correction coefficient K" 肥3 The value ranges from 0.85 to 0.95.

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