RU2395558C1 - Procedure for preparing coal charge for production of metallurgical coke - Google Patents

Abstract

FIELD: metallurgy. ^ SUBSTANCE: there is performed laboratory coking. Quality of each i-coal component used for preparation of charge for coking is evaluated relative to coefficient of process value (CPVi). Share of each i-coal component used at preparation of charge is determined in a coke and caking groups and by their dimension with consideration to coefficient of process value of each i-coal component. Coefficient of process value is determined correspondingly of the coke group (CPVk) and of the caking group (CPVc) and for coal charge (CPVch). Further there are determined shares of coke and caking groups in coal charge for production of metallurgical coke (Ccch, Ccakech). Share of each i-coal component contained correspondingly in coke and caking groups in charge for production of metallurgical coke is determined on base of value of share of each i-coal component used for preparation of coal charge correspondingly in the coke and caking groups and on base of shares of the coke and caking groups in coal charge for preparation of metallurgical coke. ^ EFFECT: preparing coal charge including coal components of various grades and wide range of coal basins for production of metallurgical coke of high mechanical properties. ^ 5 tbl

Description

The invention relates to the production of metallurgical coke and can be used in the coke industry, in particular for the preparation of a coal charge based on the determination of the technological value of coal components, including various grades of coal of different basin origin.

From SU 1824416, cl. СВВ 57/00, publ. 06/30/1993 there is a known method of preparing a coal charge for coking using a mixture of high humidity, including combining the charge components into groups of well-sintered and low-sintering coals, dividing the group of well-sintered coals into coarse and fine fractions by mechanical classification, dividing weakly sintering coals into coarse and fine fractions, grinding large fractions of well-sintered and low-sintering coals, mixing small fractions of well-sintered and low-sintering coals to obtain a mixture for coke Bani. Before separation into fractions, low-sintering coals are crushed, separation of crushed low-sintering coals is carried out by pneumatic separation, large fractions of coal from the pneumatic separation stage are crushed together with a large fraction of well-sintered coals, and after grinding, they are sent to the grinding stage of low-sintering coals.

The disadvantage of this method is the low quality of the finished coke.

From SU 1359292 A1, cl. СВВ 57/00, published 12/15/1987 there is also known a method of preparing a charge for coking, when processing coals of high humidity, including grinding and making a charge from coal, pneumatic separation of the charge with the separation of small and large product, crushing of a large product and its return to pneumatic separation as a recirculant, while the mixture is composed of unfinished coals and then it is crushed with a recirculant.

, причем для углей, у которых D₁₂₆₀>D₂₉₂₀, параметр (D₁₂₆₀-D₂₉₂₀), устанавливают соотношение углей в шихте так, чтобы показатель

находился в пределах 0,48-0,50, а показатель

не менее 4,1, при минимальных значений

и

(SU 1663016 А1, кл. С10В 57/04, опубл. 15.07.1991).The closest solution to the proposed method according to the technical essence and the achieved result is a method of compiling coal blends for producing metallurgical coke, based on determining the quality indicators of coal used to compile coal blends, including determining the optical absorption density (D) of coal in the infrared region frequencies 3040, 2945 and 2920 cm ^-1 , additional measurement of optical absorption densities D ₁₂₆₀ and D ₁₀₉₀ , determination of the parameter

moreover, for coals for which D ₁₂₆₀ > D ₂₉₂₀ , the parameter (D ₁₂₆₀ -D ₂₉₂₀ ), set the ratio of coal in the charge so that

was in the range of 0.48-0.50, and the indicator

not less than 4.1, with minimum values

and

(SU 1663016 A1, class СВВ 57/04, published on July 15, 1991).

The disadvantage of this method is the inability to assess the quality indicators of metallurgical coke from various coals, including from low-caking and well-caking coals and their mixtures in the production of metallurgical coke from various coals of various basin supplies (various suppliers).

The technical task of the invention is the preparation of a coal charge, including coal components of various grades and a wide basin, for the production of metallurgical coke with high mechanical properties.

The stated technical problem is solved in that the method of compiling a coal charge for producing metallurgical coke includes determining the quality indicators of the coal components used to compose the coal charge.

The differences of the method are that laboratory coking assesses the quality of each i-th coal component used to compose the charge for coking, according to the technological value coefficient (CTC _i ), which is determined by the empirical formula:

where M ₁₀ is the indicator of mechanical abrasion of the finished coke obtained from the i-th coal component used to compose the mixture, determined by laboratory coking,%;

M ₂₅ is an indicator of the mechanical strength (crushability) of the finished coke obtained from the i-th coal component used to compose the mixture, determined by laboratory coking,%;

82 - the minimum permissible value of the indicator M ₂₅ , established experimentally for high-quality metallurgical coke,%;

(see Specifications “Metallurgical Coke from Coals of the Eastern Regions” TU 1104-076100-00190437-159-96, the holder of the script is the Eastern Research Coal Chemistry Institute FSUE “VUKHIN”);

11 - the maximum allowable value of the indicator M ₁₀ , established experimentally for high-quality metallurgical coke,%;

(see technical conditions “Metallurgical coke from coals of the Eastern regions” TU 1104-076100-00190437-159-96);

1 and 3 - dimensionless coefficients established empirically, then determine the proportion of each i-th coal component used to compose the coal charge in the coke and sintering groups, and by their value, taking into account the technological value coefficient of each i-th coal component (CTC _i), is determined coefficients technological value respectively coke (TCC _k) and sintering (TCC _c) groups and charge coal for coking (TCC _br), after which the proportion of the sintering and coke coal charge groups for met . llurgicheskogo coke _(kw K, K _cw) according to the formulas: wt%

where the value of the value of КТЦ _ш - is taken in the interval between the value of the coefficient of technological value of coke and the value of coefficient of technological value of sintering groups, but not less than 1, after which the value of the fraction of each i-th coal component used to compose the mixture in coke and sintering groups, and the shares of coke and sintering groups in the coal charge to obtain metallurgical coke determine the proportion of each i-th coal component included respectively in the coke and sintering-hand group in the mixture to obtain a metallurgical coke.

It has been experimentally established that in order to obtain metallurgical coke with high strength properties, the coal batch charge CTC should be equal to from 1 to the maximum CTC value determined from the coke or sintering group of coal components.

Based on this, according to the obtained values of the CTC of the coal components, their ratio in the charge is established.

The above dependencies were obtained experimentally.

The fractional participation of each i-th coal component in the charge for producing metallurgical coke is determined by the following operations:

- determined by laboratory analysis of M ₂₅ and M ₁₀ , then determine the CTC of each i-th coal component used to compose the mixture - CTC _i - according to the formula [1];

- determine the share of the i-th coal component of each supplier in the total number of coal components used to compose the mixture, according to the formula:

where K _i is the share of the i-th coal component of each supplier in the total number of coal components used to compose the mixture, wt.%:

V _i - the amount of coal component of each i-th supplier, t;

V is the total number of coal components used to compose the coal charge, t;

- determine the proportion of coke and sintering groups in the total number of coal components used to compose the mixture, according to the formula:

where K _to and K _with are the shares of coke and sintering groups, respectively, in the total number of coal components used to compose the charge (from stock), wt.%;

V _to and V _with - the number of coal components of the coke and sintering groups, respectively, used to compose the mixture (from stock), t;

- separately determine the share of the i-th coal component of each supplier in the coke and sintering groups - D _ik and D _ic according to the formula, wt.%:

- calculate the CTC, respectively, coke and sintering group according to the formulas:

where КТЦ _к and КТЦ _с are technological value coefficients of the coke and sintering groups, respectively;

- then determine the proportion of coke and sintering groups in the coal charge to obtain metallurgical coke according to the formulas:

where K _Ksh and K _Sg are the shares of the coke and sintering groups in the coal charge, respectively, to obtain metallurgical coke, wt.%;

КТЦ _ш - set coefficient of technological value of a coal charge for coking, the value of which is selected (set) in the interval between the values of КТЦ _к and КТЦ _с , but not less than 1. When the value of КТЦ _{ш is} less than 1, the quality of metallurgical coke, namely М ₂₅ and M ₁₀ (table 5);

- Next, determine the proportion of each i-th coal component included in the coke and sintering groups, respectively, in the coal charge to obtain metallurgical coke according to the formulas:

where D _{i (ksh)} is the proportion of each i-th coal component included in the coke group in the coal charge to obtain metallurgical coke, wt.%;

D _{i (s)} - the proportion of each i-th coal component included in the sintering group in the coal charge to obtain metallurgical coke, wt.%.

Example 1

1. Laboratory by individual coking determine the indicators of M ₂₅ and M _{10 of} coke obtained from each i-th coal component, and then determine the CTC of each i-th coal component used to compose the mixture and stored in the warehouse, according to the formula [1] :

M _{25 GOF coke oven} = 80.2%

M _{10 GOF coke oven} = 11.9%

KTTs _{GOF coke oven} = 1- [3- {1- (11.9-11) / 11 + 1- (82-80.2) / 82 + 1}] / 3 = 0.97, etc. determination is carried out for the entire coke group.

M _{25 TsOP Belovskaya} = 82.1%

M _{10 TsOF Belovskaya} = 10.5%

KTZ _{TsOF Belovskaya} = 1- [3- {1- (10.5-11) / 11 + 1- (82-82.1) / 82 + 1}] / 3 = 1.02, etc. determination is carried out for the entire sintering group (table 1, column 3).

2. The total stock of coal components in a coal warehouse (for example, at OJSC MMK) is 320 thousand tons. The sintering group structure is represented by suppliers of coal components: Belovskaya coal processing plant - 64,000 tons; Pecherskaya PF - 32,000 tons; Denisovskoye - 48,000 tons; PF Raspadskaya - 16,000 tons; Ulyanovsk -16000 t.

The structure of the coke group is represented by suppliers of coal components: GOF Coke - 67200 t; PF Mezhdurechenskaya - 30400 t; TsOP Siberia -14,400 tons; PF Neryungrinskaya - 32,000 tons

3. Determine the share of the i-th coal component of each supplier in the total number of coal components used to compose the charge and stored in the warehouse - K, according to the formula [4]:

K _{TsOP Belovskaya} = (64000/320000) × 100 = 20%, etc. (table 1, column 4).

4. Determine the proportion of coke and sintering groups in the total number of coal components used to compose the mixture - K _to and K _with the formulas [5] and [6]:

K _k = [(67200 + 30400 + 14400 + 32000) / 320,000] × 100 = 45%

K _c = [(64000 + 32000 + 48000 + 16000 + 16000) / 320 000)] × 100 = 55% (Table 1, column 4).

5. Determine the share of the i-th coal component of each supplier in the coke and sintering groups, _{respectively,} D _ik and D _ic , by the formulas [7] and [8], respectively:

D _{GOF coke oven c} = (21/45) × 100 = 46.67%, etc.

D _{TsOF Belovskaya s} = (20/55) × 100 = 36.36%, etc. (table 1, column 5)

6. Determined by the formulas [9] and [10] CTC coke and sintering groups CTC _to and CTC _with :

KTC _k = [(46.67 × 0.97) + (21.11 × 0.98) + (10 × 0.99) + (22.22 × 1.09)] / 100 = 1.001

CTC _c = [(36.36 × 1.02) + (0 × 0.92) + (18.18 × 1.08) + (9.09 × 0.91) + (27.27 × 1.13 ) + (9.09 × 0.93)] / 100 = 1.043 (Table 1, column 6);

Select CTC _w = 1.02.

7. Determine the proportion of coke and sintering groups in the coal charge to obtain metallurgical coke - K _Ksh and K _sh according to the formulas [2] and [3]:

K _Ksh = [(1.001-1.02) / (1.001-1.043)] × 100 = 45.2%

K _ss = [(1,020-1,043) / (1,001-1,043)] × 100 = 54.8% (Table 1, column 7)

8. Determine the proportion of each i-th coal component included in the coke and sintering groups, respectively, in the coal charge for producing metallurgical coke - D _{i (ksh)} and D _{i (ssh)} according to the formulas [11] and [12]:

- in the coke group:

D _{TsOF Coke (ksh)} = (46.67 × 45.2) / 100 = 21.1%

D _{PF Mezhdurechenskaya (ksh)} = (21.11 × 45.2) / 100 = 9.54%

D _{TsOF Siberia (ksh)} = (10 × 45.2) / 100 = 4.52%

D _{PF Tomusinskaya (ksh)} = (0.0 × 45.2) / 100 = 0%

D _{PF Neryungrinskaya (ksh)} = (22.22 × 45.2) / 100 = 10.04%

- in the sintering group:

D _{TsOF Belovskaya (US)} = (36.36 × 54.8) / 100 = 19.93%

D _{PF Pechora (s)} = (18.18 × 54.8) / 100 = 9.96%

D _{OF Raspadskaya (s)} = (9.09 × 54.8) / 100 = 4.98%

_{Denisovskoe (N)} = (27.27 × 54.8) / 100 = 14.95%

D _{Ulyanovskaya (s)} = (9.09 × 54.8) / 100 = 4.98% (Table 1, column 7).

Thus, for a given KTC, _w = 1.02, based on the reserves of coal components in the warehouse, the shares of each i-th coal component in the composition of the coal charge for producing metallurgical coke are determined. The laboratory method determines the strength indicators of the obtained coke M ₂₅ and M ₁₀ from the selected composition of the charge, which respectively amounted to 86.7% and 7.95%.

The results of the determination of five pilot checks of the composition of the coal charge for a given coefficient of technological value - KTZ _sh are given in tables 1, 2, 3, 4, 5.

According to the results of the experiments, it is clear that the proposed method of compiling a coal charge for producing metallurgical coke will make it possible to obtain metallurgical coke with high mechanical properties, in the presence of any coal components in stock, namely with an index of mechanical strength (crushing) of M ₂₅ from 83.96% up to 86.68% and the abrasion index M ₁₀ from 9.22% to 7.95% (Table 1, 2, 3, 4). Table 5 Example 5 is reflected, wherein the value of _k and TCC TCC _to less than 1, and hence TCC _w within this range will also be less than 1. The quality of the coke does not meet the requirements for metallurgical coke, namely the M ₂₅ = 78.63 %, i.e. less than 82%, and M ₁₀ = 11.73%, i.e. more than 11%.

Using the proposed method of compiling a coal charge to obtain metallurgical coke will reduce the consumption of the latter in a blast furnace process for smelting cast iron.

table 2 Name of suppliers Coal brands CTC _i K _i , wt.% D _ic , D _ic , wt.%. KTC _s , KTC _k D _{i (s)} , D _{i (ks)} , wt.% one 2 3 four 5 6 TsOF Belovskaya W, KS 1,02 thirty 60.0 21.82 PF Raspadskaya GJO, GJ 0.91 twenty 40,0 14.54 Total sintering group K _s = 50.0 100.0 Ctc _s = 0.976 _Cg = 36.36 GOF Coke K, KO, KS, OS 0.97 21 42.0 26.73 GOF Ziminka KS, SPE 0.64 0 0,0 0.00 GOF Anzherskaya KO 0.96 12 24.0 15.27 GOF Anzherskaya The cop 0.84 0 0,0 0.00 GOF Anzherskaya SPE 0.76 0 0,0 0.00 KARO LLC SPE 0.65 0 0,0 0.00 PF Bachatskaya KO 0.85 2.5 5,0 3.18 PF Tomusinskaya The cop 0.78 0 0,0 0.00 PF Mezhdurechenskaya OS 0.98 9.5 19.0 12.10 Coking additive 1.75 5 10.0 6.36 PF Neryungrinskaya OS 1.09 0 0,0 0.00 TOTAL by coke group K _k = 50.0 one hundred KTC _to = 1,042 K _ksh = 63.64 ASKED COAL OF THE COAL CHARGE (CTC _w ) 1.00 100.0 The values of indicators of strength and abrasion of metallurgical coke,% M25 M10 85,528 8,494

Table 3 Name of suppliers Coal brands CTC _i K _i , wt.% D _ic , D _ic , wt.%. KTC _s , KTC _k D _{i (s)} , D _{i (ks)} , wt.% one 2 3 four 5 6 7 TsOF Bedovskaya W, KS 1,02 thirty 60.0 30.91 PF Raspadskaya GJO, GJ 0.91 twenty 40,0 20.61 Total sintering group K _s = 50.0 100.0 Ctc _s = 0.976 By _cw = 51.52 GOF Coke K, KO, KS, OS 0.97 21 42.0 20.36 GOF Ziminka KS, SPE 0.64 0 0,0 0.00 GOF Anzherskaya KO 0.96 12 24.0 11.64 GOF Anzherskaya The cop 0.84 0 0,0 0.00 GOF Anzherskaya SPE 0.76 0 0,0 0.00 KARO LLC SPE 0.65 0 0,0 0.00 PF Bachatskaya KO 0.85 2.5 5,0 2.42 PF Tomusinskaya The cop 0.78 0 0,0 0.00 PF Mezhdurechenskaya OS 0.98 9.5 19.0 9.21 Coking additive 1.75 5 10.0 4.85 PF Neryungrinskaya OS 1.09 0 0,0 0.00 TOTAL by coke group K _to = 50.0 one hundred KTC _to = 1,042 _Ksh = 48.48 ASKED COAL OF THE COAL CHARGE (CTC _w ) 1.01 100.0 The values of indicators of strength and abrasion of metallurgical coke,% M25 M10 86,10308 8.22444

Table 4 Name of suppliers Coal brands CTC _i K _i , wt.% D _ic , D _ic , wt.%. KTC _s , KTC _k D _{i (s)} , D _{i (ks)} , wt.% one 2 3 four 5 6 7 TsOF Belovskaya W, KS 1,02 thirty 60.0 40.00 PF Raspadskaya GJO, GJ 0.91 twenty 40,0 26.67 Total sintering group K _s = 50.0 100.0 Ctc _s = 0.976 K _NL = 66.67 GOF Coke K, KO, KS, OS 0.97 21 42.0 14.00 GOF Ziminka KS, SPE 0.64 0 0,0 0.00 GOF Anzherskaya KO 0.96 12 24.0 8.00 GOF Anzherskaya The cop 0.84 0 0,0 0.00 GOF Anzherskaya SPE 0.76 0 0,0 0.00 KARO LLC SPE 0.65 0 0,0 0.00 PF Bachatskaya KO 0.85 2.5 5,0 1,67 PF Tomusinskaya The cop 0.78 0 0,0 0.00 PF Mezhdurechenskaya OS 0.98 9.5 19.0 6.33 Coking additive 1.75 5 10.0 3.33 PF Neryungrinskaya OS 1.09 0 0,0 0.00 TOTAL by coke group K _to = 50.0 100.0 KTC _to = 1,042 _Ksh = 33.33 ASKED COAL OF THE COAL CHARGE (CTC _w ) 1,02 100.0 The values of indicators of strength and abrasion of metallurgical coke,% M 25 M 10 86,67816 7.95488

Table 5 Name of suppliers Coal brands KTCi K _i , wt.% D _ic , D _ic , wt.% KTC _s , KTC _k D _{i (s)} , D _{i (ks)} , wt.% one 2 3 four 5 6 7 TsOF Belovskaya W, KS 1,02 5 11.1 6.30 PF Raspadskaya GJO, GJ 0.91 40 88.9 50.46 Total sintering group K _s = 45.0 100.0 Ctc _s = 0.922 K _N = 56.76 GOF Coke K, KO, KS, OS 0.97 0 0,0 0.00 GOF Ziminka KS, SPE 0.64 21 38.18 16.51 GOF Anzherskaya KO 0.96 914.5 16.36 7.07 PF Mezhdurechenskaya OS 0.98 26.36 11.40 TsOF Siberia COP, OS 0.99 10.5 19.10 8.26 TOTAL by coke group K _to = 55.0 100.0 KTC _to = 0.848 _Ksh = 43.24 ASKED COAL OF THE COAL CHARGE (CTC _w ) 0.8800 100.0 The values of indicators of strength and abrasion of metallurgical coke,% M25 M10 78.62704 11,72872

Claims (1)

A method of compiling a coal charge for producing metallurgical coke, including determining the quality indicators of the coal components used to compose the coal charge, characterized in that laboratory coking is carried out and the quality of each i-th coal component used to compose the charge for coking is evaluated according to the technological coefficient values (КТЦ _i ), which is determined by the empirical formula:

where M ₁₀ is an indicator of the mechanical abrasion of finished coke obtained from the i-th coal component used to compose the mixture, determined by laboratory methods,%;
M ₂₅ - an indicator of the mechanical strength (crushability) of finished coke obtained from the i-th coal component used to compose the mixture, determined by laboratory methods,%;
82 - the minimum permissible value of the indicator M ₂₅ , established experimentally for high-quality metallurgical coke,%;
11 - the maximum allowable value of the indicator M ₁₀ , established experimentally for high-quality metallurgical coke,%;
1 and 3 - dimensionless coefficients established empirically, then determine the proportion of each i-th coal component used to compose the charge in the coke and sintering groups and by their size, taking into account the coefficient of technological value of each i-th coal component (CTC _i ), determine the coefficient of technological value, respectively, of coke (КТЦ _к ) and sintering (КТЦ _с ) groups and a coal charge (КТЦ _ш ), and then determine the shares of coke and sintering groups in a coal charge to obtain metallurgical coke ( _Кш , К _{с w} ) according to the formulas, wt.%:

where the value of the value of КТЦ _ш - is taken in the interval between the value of the coefficient of technological value of coke and the value of coefficient of technological value of sintering groups, but not less than 1, and the value of the fraction of each i-th coal component used to compose the coal charge in coke and sintering groups, and the shares of coke and sintering groups in a coal charge to obtain metallurgical coke, determine the proportion of each i-th coal component included in the coke, respectively and sintering groups in the mixture to obtain metallurgical coke.