Method for preparing Russian coal for heat recovery coke oven

Abstract

The invention relates to a method for preparing Russian coal for a heat recovery coke oven, which comprises the following steps: according to MCI and MF of coking coal, dividing the coking coal into 9 categories, and setting the coal blending proportions of the 9 categories of coking coal: 10-18% of high-alkalinity high-fluidity coal, 0-5% of high-alkalinity medium-fluidity coal and 0-5% of high-alkalinity low-fluidity coal; the mass percentage of medium-alkalinity high-fluidity coal is 6%-13%, the mass percentage of medium-alkalinity medium-fluidity coal is 0-12%, and the mass percentage of medium-alkalinity low-fluidity coal is 25%-32%; the mass percent of the low-alkalinity high-fluidity coal is 7-15%, the mass percent of the low-alkalinity medium-fluidity coal is 0-8%, the mass percent of the low-alkalinity low-fluidity coal is 22-27%, and the proportion of the Russian coal in the coking coal is 25-35 wt%. According to the method, large-proportion application of the Russian fat coal and the Russian meagre coal can be realized, and qualified coke is produced, so that the coal blending cost is reduced, and coking coal resources are expanded.

Description

Technical Field

[0001] The invention relates to the field of coking coal blending in the coking industry, and in particular to a method for blending Russian coal in a heat recovery coke oven. Background Art

[0002] The heat recovery coke oven adopts ramming coal loading, long turnover time coking, negative pressure operation throughout the process, and no pollutants escape; coal gas and chemical products are all burned in the furnace, and the high-temperature exhaust gas generated is recovered through waste heat to produce steam (power generation or steam external supply); the exhaust gas is discharged after desulfurization and denitrification, and no phenol-cyanide wastewater is generated during the whole process. It is an environmentally friendly coking process throughout the production process. The coking operation and coal blending scheme of the heat recovery coke oven are different from those of conventional top-loading coke ovens and ramming coke ovens.

[0003] With the rapid development of the coking industry, my country's coking coal resources are becoming increasingly scarce, and the supply and demand continue to be unbalanced. Therefore, it is necessary to introduce foreign coking coal resources to supplement them. Russian coking coal has a complete range of varieties, a large supply, and a short transportation distance. The price is several hundred yuan cheaper than similar domestic coal, and it is conducive to alleviating the tight supply and demand of domestic coking coal and stabilizing the price fluctuations in the domestic coking coal market. However, due to the special coal-forming environment, the quality of most Russian coal is far from that of domestic coking coal, and the thermal strength (CSR) of a single type of coal is low. If it is not properly matched, the thermal strength (CSR) of coke will be seriously affected after coal matching.

[0004] The application of Russian coal has always been a focus and difficulty in the industry. Patent CN 117004423 A discloses a blended coal, coke and preparation method involving Russian fat coal with a high mineral catalytic index. The fat coal includes 5% to 20% Russian fat coal, and Russian fat coal replaces part of fat coal and gas fat coal for blended coal coking. Patent CN116103056A provides a coke blended with Russian coal and a production method thereof, wherein Russian coal is 15% to 20%, realizing a large proportion of Russian coal application. Patent CN105255509A discloses a coking coal blending method, wherein low-sulfur Russian lean coking coal is 8% to 15%, and each coking coal is mixed to prepare blended coal, and the coke M40 reaches more than 86%, M10 reaches less than 6.5%, and CSR reaches more than 64%.

[0005] The above applications are all in tamping coke ovens and top-loading coke ovens, and the application in heat recovery coke oven coal blending has not yet been found. And it is limited to Russian fat coal and lean coking coal, and has not been applied to other Russian coals. Summary of the invention

[0006] The invention provides a method for using Russian coal in a heat recovery coke oven, which realizes the large-scale application of Russian fat coal and Russian lean coal, produces qualified coke, thereby reducing the coal blending cost and expanding the coking coal resources.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A method for using Russian coal in a heat recovery coke oven, according to the catalytic index MCI and the maximum fluidity α of the ash composition of the coking coal max , the coking coals are divided into 9 categories, and the blending ratios of the 9 categories of coking coal are set as follows:

[0009] The mass percentage of high basicity high fluidity coal (HH) is 10% to 18%, the mass percentage of high basicity medium fluidity coal (HM) is 0 to 5%, and the mass percentage of high basicity low fluidity coal (HL) is 0 to 5%;

[0010] The mass percentage of medium basicity high fluidity coal (MH) is 6% to 13%, the mass percentage of medium basicity medium fluidity coal (MM) is 0 to 12%, and the mass percentage of medium basicity low fluidity coal (ML) is 25% to 32%;

[0011] The mass percentage of low basicity high fluidity coal (LH) is 7% to 15%, the mass percentage of low basicity medium fluidity coal (LM) is 0 to 8%, and the mass percentage of low basicity low fluidity coal (LL) is 22% to 27%;

[0012] Moreover, the total proportion of high basicity high fluidity coal (HH), high basicity medium fluidity coal (HM) and high basicity low fluidity coal (HL) is required to be ≤20wt%; in order to ensure the total maximum fluidity of the combined coal, the total proportion of high basicity high fluidity coal (HH), medium basicity high fluidity coal (MH) and low basicity high fluidity coal (LH) is required to be ≥30wt%; the total proportion of all coals in coking coal is 100%, of which the proportion of Russian coal is between 25wt% and 35wt%.

[0013] The high basicity and high fluidity coal (HH) is a coal ash component catalytic index MCI>6% or a coal ash component K 2 O+Na 2 O+Fe 2 O 3 +CaO+MgO total content>18wt%, and the maximum flowability of the base max >15000dd / min coking coal.

[0014] The high basicity medium fluidity coal (HM) is a coal ash component catalytic index MCI>6% or a coal ash component K 2 O+Na 2 O+Fe 2 O 3 +CaO+MgO total content>18wt%, and the maximum flowability of the base max Coking coal at 1000-15000dd / min.

[0015] The high basicity and low fluidity coal (HL) is a coal ash component catalytic index MCI>6% or a coal ash component K 2 O+Na 2 O+Fe 2 O 3 +CaO+MgO total content>18wt%, and the maximum flowability of the base max Coking coal with a rate of <1000dd / min.

[0016] The medium basicity high fluidity coal (MH) is a coal ash component catalytic index MCI of 3% to 6% or a coal ash component K 2 O+Na 2 O+Fe 2 O 3 The total content of +CaO+MgO is between 12wt% and 18wt%, and the maximum fluidity of the base is α max >15000dd / min coking coal.

[0017] The medium basicity and medium fluidity coal (MM) is a coal ash component catalytic index MCI of 3% to 6% or a coal ash component K 2 O+Na 2 O+Fe 2 O 3 The total content of +CaO+MgO is between 12wt% and 18wt%, and the maximum fluidity of the base is α max Coking coal at 1000-15000dd / min.

[0018] The medium basicity low fluidity coal (ML) is a coal ash component catalytic index MCI of 3% to 6% or a coal ash component K 2 O+Na 2 O+Fe 2 O 3 The total content of +CaO+MgO is between 12wt% and 18wt%, and the maximum fluidity of the base is α max Coking coal with a rate of <1000dd / min.

[0019] The low basicity high fluidity coal (LH) is a coal ash component catalytic index MCI < 3% and the K 2 O+Na 2 O+Fe 2 O 3 +CaO+MgO total content <12wt%, and the maximum fluidity of the base max >15000dd / min coking coal.

[0020] The low-basicity medium-fluidity coal (LM) is a coal ash component catalytic index MCI < 3% and the K 2 O+Na 2 O+Fe2 O 3 +CaO+MgO total content <12wt%, and the maximum fluidity of the base max Coking coal at 1000-15000dd / min.

[0021] The low basicity and low fluidity coal (LL) is a coal ash component catalytic index MCI < 3% and the K 2 O+Na 2 O+Fe 2 O 3 +CaO+MgO total content <12wt%, and the maximum fluidity of the base max Coking coal with a rate of <1000dd / min.

[0022] After the 9 types of coal are blended and homogenized, the blended coal indicators meet the following requirements: ash content A d ≤10.2%, Volatile matter V daf ≤26%, coal ash catalytic index MCI ≤3.5% or K in coal ash 2 O+Na 2 O+Fe 2 O 3 +CaO+MgO total content ≤13wt%, Kiel maximum fluidity α max ≥500dd / min, and CSR≥40%. If the combined coal index cannot meet the above requirements, readjust the proportions of the nine types of coal.

[0023] The indicators of the selected Russian fat coal are: volatile matter 31% to 38%, G value 95 to 100, Y value 25 to 32 mm, maximum fluidity α max 17000~30000dd / min, K in coal ash 2 O+Na 2 O+Fe 2 O 3 The total content of +CaO+MgO>18wt% or the coal ash component catalytic index MCI value>6%. According to the above definition rules, Russian fat coal belongs to high basicity and high fluidity coal (HH).

[0024] The indicators of the selected Russian lean coal are: volatile matter 19% to 20%, G value 75 to 80, Y value 10 to 14 mm, maximum fluidity α max 0~100dd / min, K in coal ash 2 O+Na 2 O+Fe 2 O 3The total content of +CaO+MgO>18wt% or the catalytic index MCI value of coal ash>6%. According to the definition rules mentioned above, Russian PCI coal belongs to low basicity and low fluidity coal (HL).

[0025] The indicators of the selected Russian lean coal are: volatile matter 14% to 16%, G value 0, Y value 0mm, maximum fluidity α max 0dd / min, K in the coal ash 2 O+Na 2 O+Fe 2 O 3 The total content of +CaO+MgO is less than 12wt% and the MCI value of coal ash composition is less than 3%. According to the definition rules mentioned above, Russian lean coal belongs to low basicity and low fluidity coal (LL).

[0026] After the nine types of coal are blended and homogenized, the coal preparation and coking production are carried out according to the heat recovery coke oven process flow, which includes: crushing the blended coal, with the proportion of coal less than 3mm accounting for 88% to 91wt%; and then tamping, with the tamping bulk density set at 1.00 to 1.05t / m 3 ; Then the pounded coal cakes are sent to the coal loading car together with the coal supporting plate and transported to the carbonization chamber to start coking; the coking time is 65 to 80 hours. After the coking is completed, dry quenching is used for quenching.

[0027] The produced coke has CSR≥65%, M40≥90%, and other indicators meet the requirements of national standard first-grade coke.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] Aiming at the low thermal strength (CSR) of a single coal caused by high alkalinity of Russian fat coal and lean coal, and the non-fluidity and non-adhesiveness of Russian lean coal, the present invention proposes to reclassify coking coal into 9 categories according to the coal ash component catalytic index MCI and the Kjeldahl maximum fluidity MF index, reasonably match the proportions of various types of coal, balance the alkalinity and fluidity indicators of Russian fat coal, lean coal and lean coal, achieve large-proportion matching, and produce high-quality and low-cost coke in a heat recovery coke oven.

[0030] The details are as follows:

[0031] 1. The present invention realizes the large-scale application of Russian coal, with the total proportion reaching 25% to 35%; the quality of coke produced meets 2000m 3 Blast furnace demand.

[0032] 2. Since Russian coal is cheaper than domestic coal, the cost of coal blending is further reduced.

[0033] 3. The present invention realizes the first application of Russian coal in heat recovery coke ovens, expanding the application scenarios of Russian coal.

[0034] 4. The present invention expands the coking coal resources and reduces the dependence on domestic coking coal. DETAILED DESCRIPTION

[0035] The specific implementation modes of the present invention are further described below in conjunction with examples. The following examples are used to specifically illustrate the contents of the present invention. These examples are only general descriptions of the contents of the present invention and do not limit the contents of the present invention.

[0036] The components in the coal ash are determined according to GB / T 1574-2007 "Coal ash composition analysis method"; the ash component catalytic index MCI value is calculated according to formula 1:

[0037]

[0038] Kiel's maximum fluidity α max The determination is carried out in accordance with GB / T25213-2010.

[0039] The present invention will be further described in detail below with reference to specific embodiments.

[0040] Example 1: The selected Russian fat coal, lean coal and poor coal, as well as other coking coal indicators are shown in Table 1.

[0041] Table 1 Quality indicators of Russian coal and other coking coal

[0042]

[0043]

[0044] The first step is to calculate the catalytic index MCI and the maximum fluidity α of the ash composition of coking coal. max The selected Russian fat coal, lean coal, poor coal and other coking coal were redefined and classified. The results are shown in the last column of Table 1.

[0045] In the second step, the proportions of the nine major types of coking coal are set as follows: HH coal mass percentage 10%, HM coal mass percentage 0%, HL coal mass percentage 5%; MH coal mass percentage 13%, MM coal mass percentage 12%, ML coal mass percentage 31%; LH coal mass percentage 7%, LM coal mass percentage 0%, LL coal mass percentage 22%; further, the total proportion of HH coal, HM coal and HL coal is set to 15% to meet the requirement of ≤20%; and the total proportion of HH coal, MH coal and LH coal is 30%, which meets the requirement of ≥30%. See Table 2 Example 1 for details.

[0046] Table 2 Coal ratios of the examples and comparative examples

[0047]

[0048] Step 3: After the 9 types of coal are mixed and homogenized, the mixed coal indicators are as follows: ash content Ad is 10.1%, volatile content V daf is 25.8%, the coal ash component MCI is 3.3%, K 2 O+Na 2 O+Fe 2 O 3 +CaO+MgO total content is 13%, the maximum fluidity of the base is α max The speed is 550 dd / min, and the total CSR is 41.4%. The requirements are met. The specific indicators are shown in Table 3 Example 1.

[0049] Finally, the coal preparation and coking production are carried out according to the heat recovery coke oven process flow, including: crushing the blended coal, the proportion of crushed coal less than 3mm is 88%; then tamping, and the tamping bulk density is set at 1.00t / m 3 Then the pounded coal cakes together with the coal support plate are sent to the coal loading car and transported to the carbonization chamber to start coking. After 70 hours of coking time, coking is completed. Dry quenching is used for coking.

[0050] Table 3 Coal indexes of the embodiments and comparative examples

[0051]

[0052] The total proportion of Russian coal reached 27%; the CSR of the produced coke was 65.5%, M40 was 90.6%, and other indicators met the requirements of national standard first-class coke.

[0053] Example 2: The selected Russian fat coal, lean coal and poor coal, as well as other coking coal indicators are shown in Table 1.

[0054] The first step is to calculate the catalytic index (MCI) and the maximum fluidity (α) of the coking coal. max The selected Russian fat coal, lean coal, poor coal and other coking coal were redefined and classified. The results are shown in the last column of Table 1.

[0055] In the second step, the proportions of the nine major types of coking coal are set as follows: HH coal 10% by mass, HM coal 5% by mass, HL coal 5% by mass; MH coal 6% by mass, MM coal 0% by mass, ML coal 25% by mass; LH coal 14% by mass, LM coal 8% by mass, LL coal 27% by mass; further, the total proportion of HH coal, HM coal and HL coal is set to 20% to meet the requirement of ≤20%; and the total proportion of HH coal, MH coal and LH coal is 30%, which meets the requirement of ≥30%. See Example 2 in Table 2 for details.

[0056] Step 3: After the 9 types of coal are mixed and homogenized, the mixed coal indicators are as follows: ash content Ad is 10.0%, volatile matter V daf 26.0%, coal ash component MCI is 3.25%, K 2 O+Na 2 O+Fe 2 O 3 The total content of +CaO+MgO is 12.8%, and the maximum fluidity of max The speed is 520 dd / min, and the total CSR is 43.6%. The requirements are met. The specific indicators are shown in Example 2 in Table 3.

[0057] Finally, the coal preparation and coking production are carried out according to the heat recovery coke oven process flow, including: crushing the blended coal, the proportion of crushed coal less than 3mm is 89%; then tamping, and the tamping bulk density is set at 1.00t / m 3 Then the pounded coal cakes together with the coal support plate are sent to the coal loading car and transported to the carbonization chamber to start coking. After 70 hours of coking time, coking is completed. Dry quenching is used for coking.

[0058] The total proportion of Russian coal reached 27%; the CSR of the produced coke was 66.2%, M40 was 91.3%, and other indicators met the national standard requirements for first-grade coke.

[0059] Example 3: The selected Russian fat coal, lean coal and meagre coal, as well as other coking coal indicators are shown in Table 1.

[0060] The first step is to calculate the catalytic index (MCI) and the maximum fluidity (α) of the coking coal. max The selected Russian fat coal, lean coal, poor coal and other coking coal were redefined and classified. The results are shown in the last column of Table 1.

[0061] In the second step, the proportions of the nine major types of coking coal are set as follows: HH coal mass percentage 15%, HM coal mass percentage 0%, HL coal mass percentage 0%; MH coal mass percentage 7%, MM coal mass percentage 7%, ML coal mass percentage 32%; LH coal mass percentage 14%, LM coal mass percentage 0%, LL coal mass percentage 25%; further, the total proportion of HH coal, HM coal and HL coal is set to 15% to meet the requirement of ≤20%; and the total proportion of HH coal, MH coal and LH coal is 36%, which meets the requirement of ≥30%. See Example 3 in Table 2 for details.

[0062] Step 3: After the 9 types of coal are mixed and homogenized, the mixed coal indicators are as follows: ash content Ad is 10.2%, volatile content V daf is 25.9%, the coal ash component MCI is 3.14%, K 2O+Na 2 O+Fe 2 O 3 The total content of +CaO+MgO is 12.6%, and the maximum fluidity of max The speed is 680 dd / min, and the total CSR is 40.8%. The requirements are met. The specific indicators are shown in Example 3 in Table 3.

[0063] Finally, the coal preparation and coking production are carried out according to the heat recovery coke oven process flow, including: crushing the blended coal, the proportion of crushed coal less than 3mm is 88%; then tamping, and the tamping bulk density is set at 1.00t / m 3 Then the pounded coal cakes together with the coal support plate are sent to the coal loading car and transported to the carbonization chamber to start coking. After 70 hours of coking time, coking is completed. Dry quenching is used for coking.

[0064] The total proportion of Russian coal reached 31%; the CSR of the produced coke was 65.1%, M40 was 90.2%, and other indicators met the national standard requirements for first-grade coke.

[0065] Example 4: The selected Russian fat coal, lean coal and meagre coal, as well as other coking coal indicators are shown in Table 1.

[0066] The first step is to calculate the catalytic index (MCI) and the maximum fluidity (α) of the coking coal. max The selected Russian fat coal, lean coal, poor coal and other coking coal were redefined and classified. The results are shown in the last column of Table 1.

[0067] In the second step, the proportions of the nine major types of coking coal are set as follows: HH coal 18% by mass, HM coal 0% by mass, HL coal 0% by mass; MH coal 6% by mass, MM coal 0% by mass, ML coal 31% by mass; LH coal 13% by mass, LM coal 5% by mass, LL coal 27% by mass; further, the total proportion of HH coal, HM coal and HL coal is set to 18% to meet the requirement of ≤20%; and the total proportion of HH coal, MH coal and LH coal is 37%, which meets the requirement of ≥30%. See Example 4 in Table 2 for details.

[0068] Step 3: After the 9 types of coal are mixed and homogenized, the mixed coal indicators are as follows: ash content Ad is 9.8%, volatile content V daf 25.5%, coal ash component MCI is 3.06%, K 2 O+Na 2 O+Fe 2 O 3 The total content of +CaO+MgO is 12.4%, and the maximum fluidity of maxThe speed is 620 dd / min, and the total CSR is 45.3%. The requirements are met. The specific indicators are shown in Example 4 in Table 3.

[0069] Finally, the coal preparation and coking production are carried out according to the heat recovery coke oven process flow, including: crushing the blended coal, with 90% of the crushed coal less than 3mm; and then tamping, with the tamping bulk density set at 1.05t / m 3 Then the pounded coal cakes together with the coal support plate are sent to the coal loading car and transported to the carbonization chamber to start coking. After 70 hours of coking time, coking is completed. Dry quenching is used for coking.

[0070] The total proportion of Russian coal reached 32%; the CSR of the produced coke was 66.8%, M40 was 92.8%, and other indicators met the requirements of national standard first-grade coke.

[0071] Example 5: The selected Russian fat coal, lean coal and meagre coal, as well as other coking coal indicators are shown in Table 1.

[0072] The first step is to calculate the catalytic index (MCI) and the maximum fluidity (α) of the coking coal. max The selected Russian fat coal, lean coal, poor coal and other coking coal were redefined and classified. The results are shown in the last column of coal categories in Table 1.

[0073] In the second step, the proportions of the nine major types of coking coal are set as follows: HH coal mass percentage 18%, HM coal mass percentage 0%, HL coal mass percentage 0%; MH coal mass percentage 10%, MM coal mass percentage 0%, ML coal mass percentage 30%; LH coal mass percentage 15%, LM coal mass percentage 0%, LL coal mass percentage 27%; further, the total proportion of HH coal, HM coal and HL coal is set to 18% to meet the requirement of ≤20%; and the total proportion of HH coal, MH coal and LH coal is 43%, which meets the requirement of ≥30%. See Example 5 in Table 2 for details.

[0074] Step 3: After the 9 types of coal are mixed and homogenized, the mixed coal indicators are as follows: ash content Ad is 10.0%, volatile matter V daf is 25.8%, the coal ash component MCI is 2.9%, K 2 O+Na 2 O+Fe 2 O 3 The total content of +CaO+MgO is 11.7%, and the maximum fluidity of max The speed is 750 dd / min, and the total CSR is 43.4%. The requirements are met. The specific indicators are shown in Example 5 in Table 3.

[0075] Finally, the coal preparation and coking production are carried out according to the heat recovery coke oven process flow, including: crushing the blended coal, with 90% of the crushed coal less than 3mm; and then tamping, with the tamping bulk density set at 1.05t / m 3 Then the pounded coal cakes together with the coal support plate are sent to the coal loading car and transported to the carbonization chamber to start coking. After 70 hours of coking time, coking is completed. Dry quenching is used for coking.

[0076] The total proportion of Russian coal reached 27%; the CSR of the produced coke was 67.1%, M40 was 93.6%, and other indicators met the national standard requirements for first-grade coke.

[0077] Comparative Example 1: The selected Russian fat coal, lean coal and meagre coal, and other coking coal indicators are shown in Table 1.

[0078] The first step is to calculate the catalytic index (MCI) and the maximum fluidity (α) of the coking coal. max The selected Russian fat coal, lean coal, poor coal and other coking coal were redefined and classified. The results are shown in the last column of Table 1.

[0079] In the second step, the proportions of the nine major types of coking coal are set as follows: HH coal 18% by mass, HM coal 0% by mass, HL coal 8% by mass; MH coal 10% by mass, MM coal 0% by mass, ML coal 32% by mass; LH coal 10% by mass, LM coal 4% by mass, LL coal 18% by mass; further, the total proportion of HH coal, HM coal and HL coal is 26%; the total proportion of HH coal, MH coal and LH coal is 38%. See Comparative Example 1 in Table 2 for details.

[0080] Step 3: After the 9 types of coal are mixed and homogenized, the mixed coal indicators are as follows: ash content Ad is 10.1%, volatile matter Vdaf is 26.5%, coal ash composition MCI is 3.68%, K 2 O+Na 2 O+Fe 2 O 3 The total content of +CaO+MgO is 13.8%, and the maximum fluidity of max The specific indexes are shown in Table 3 for Comparative Example 1.

[0081] Finally, the coal preparation and coking production are carried out according to the heat recovery coke oven process flow, including: crushing the blended coal, the proportion of crushed coal less than 3mm is 88%; then tamping, and the tamping bulk density is set at 1.00t / m 3 Then the pounded coal cakes together with the coal support plate are sent to the coal loading car and transported to the carbonization chamber to start coking. After 70 hours of coking time, coking is completed. Dry quenching is used for coking.

[0082] The total proportion of Russian coal reached 38%; the CSR of coke produced was 60.1%, and M40 was 88.6%, and the quality of coke could not meet the requirements. This is because the proportions of the nine major types of coal did not meet the technical requirements, among which the mass percentage of HL coal was 8%, the mass percentage of LL coal was 18%, and the total proportion of HH coal, HM coal and HL coal was 26%, which exceeded the technical requirements, making the volatile matter V daf High, coal ash components MCI and K 2 O+Na 2 O+Fe 2 O 3 The total content of +CaO+MgO is too high, that is, the total basicity of the blended coal is too high, resulting in low CSR and M40 of coke.

[0083] Comparative Example 2: The selected Russian fat coal, lean coal and meagre coal, and other coking coal indicators are shown in Table 1.

[0084] The first step is to calculate the catalytic index (MCI) and the maximum fluidity (α) of the coking coal. max The selected Russian fat coal, lean coal, poor coal and other coking coal were redefined and classified. The results are shown in the last column of Table 1.

[0085] In the second step, the proportions of the nine major types of coking coal are set as follows: HH coal mass percentage 18%, HM coal mass percentage 0%, HL coal mass percentage 0%; MH coal mass percentage 11%, MM coal mass percentage 5%, ML coal mass percentage 30%; LH coal mass percentage 0%, LM coal mass percentage 0%, LL coal mass percentage 36%; the total proportion of HH coal, HM coal and HL coal is 18%; the total proportion of HH coal, MH coal and LH coal is 29%. See Comparative Example 2 in Table 2 for details.

[0086] Step 3: After the 9 types of coal are mixed and homogenized, the mixed coal indicators are as follows: ash content Ad is 9.9%, volatile content V daf is 24.6%, the coal ash component MCI is 3.2%, K 2 O+Na 2 O+Fe 2 O 3 The total content of +CaO+MgO is 12.8%, and the maximum fluidity of max The specific indexes are shown in Table 3 for Comparative Example 2.

[0087] Finally, the coal preparation and coking production are carried out according to the heat recovery coke oven process flow, including: crushing the blended coal, the proportion of crushed coal less than 3mm is 88%; then tamping, and the tamping bulk density is set at 1.00t / m 3Then the pounded coal cakes together with the coal support plate are sent to the coal loading car and transported to the carbonization chamber to start coking. After 70 hours of coking time, coking is completed. Dry quenching is used for coking.

[0088] The total proportion of Russian coal reached 30%; the CSR of coke produced was 56.9%, and the M40 was 87.7%, and the quality of coke could not meet the requirements. This is because the proportions of the nine major types of coal did not meet the technical requirements, among which the mass percentage of HH coal was 22%, and the total proportion of HH coal, MH coal and LH coal was 29%, which did not meet the technical requirements of ≥30%, that is, the proportion of low-fluidity coal in the blended coal was too high, which made the maximum fluidity of the blended coal α max It is too low and does not meet the requirements; the sum of CSR is too low and does not meet the requirements; resulting in low CSR and M40 of coke.

Claims

1. A method for using Russian coal in a heat recovery coke oven, characterized in that: According to the catalytic index MCI and the maximum fluidity α of the ash composition of coking coal max , the coking coals are divided into 9 categories, and the blending ratios of the 9 categories of coking coal are set as follows: The mass percentage of high basicity and high fluidity coal is 10% to 18%, the mass percentage of high basicity and medium fluidity coal is 0 to 5%, and the mass percentage of high basicity and low fluidity coal is 0 to 5%; The mass percentage of medium basicity high fluidity coal is 6% to 13%, the mass percentage of medium basicity medium fluidity coal is 0 to 12%, and the mass percentage of medium basicity low fluidity coal is 25% to 32%; The mass percentage of low basicity and high fluidity coal is 7% to 15%, the mass percentage of low basicity and medium fluidity coal is 0% to 8%, and the mass percentage of low basicity and low fluidity coal is 22% to 27%; Moreover, the total ratio of high-basicity high-fluidity coal, high-basicity medium-fluidity coal and high-basicity low-fluidity coal is required to be ≤20wt%; the total ratio of high-basicity high-fluidity coal, medium-basicity high-fluidity coal and low-basicity high-fluidity coal is required to be ≥30wt%; the ratio of Russian coal in coking coal is between 25wt% and 35wt%; The high-basicity and high-fluidity coal has a coal ash component catalytic index MCI>6% or a coal ash component K2O+Na2O+Fe2O3+CaO+MgO total content>18wt%, and a maximum fluidity α max >15000dd / min coking coal; The high-basicity medium-fluidity coal has a coal ash component catalytic index MCI>6% or a coal ash component K2O+Na2O+Fe2O3+CaO+MgO total content>18wt%, and a Kiel maximum fluidity α max Coking coal at 1000-15000 dd / min; The high basicity and low fluidity coal has a coal ash component catalytic index MCI>6% or a coal ash component K2O+Na2O+Fe2O3+CaO+MgO total content>18wt%, and a maximum fluidity α max Coking coal with a flow rate of <1000dd / min; The medium-basicity high-fluidity coal has a coal ash component catalytic index MCI of 3% to 6% or a coal ash component K2O+Na2O+Fe2O3+CaO+MgO total content of 12wt% to 18wt%, and a maximum fluidity α max >15000dd / min coking coal; The medium-basicity and medium-fluidity coal has a coal ash component catalytic index MCI of 3% to 6% or a coal ash component K2O+Na2O+Fe2O3+CaO+MgO total content of 12wt% to 18wt%, and a maximum fluidity α max Coking coal at 1000-15000 dd / min; The medium-basicity and low-fluidity coal has a coal ash component catalytic index MCI of 3% to 6% or a coal ash component K2O+Na2O+Fe2O3+CaO+MgO total content of 12wt% to 18wt%, and a maximum fluidity α max Coking coal with a flow rate of <1000dd / min; The low-basicity high-fluidity coal has a coal ash component catalytic index MCI <3%, a total content of K2O+Na2O+Fe2O3+CaO+MgO in the coal ash component <12wt%, and a maximum fluidity α max >15000dd / min coking coal; The low-basicity medium-fluidity coal has a coal ash component catalytic index MCI <3% and a total content of K2O+Na2O+Fe2O3+CaO+MgO in the coal ash component <12wt%, and a maximum Kiel maximum fluidity α max Coking coal at 1000-15000 dd / min; The low-basicity and low-fluidity coal has a coal ash component catalytic index MCI <3%, a total content of K2O+Na2O+Fe2O3+CaO+MgO in the coal ash component <12wt%, and a maximum fluidity α max Coking coal with a flow rate of <1000dd / min.

2. The method for using Russian coal in a heat recovery coke oven according to claim 1, characterized in that: After the 9 types of coal are blended and homogenized, the blended coal indicators meet the following requirements: ash content A d ≤10.2%, Volatile matter V daf ≤26%, coal ash catalytic index MCI ≤3.5% or total content of K2O+Na2O+Fe2O3+CaO+MgO in coal ash ≤13wt%, Kiel maximum fluidity α max ≥500dd / min, combined CSR ≥40%.

3. The method for using Russian coal in a heat recovery coke oven according to claim 1, characterized in that: The indicators of the selected Russian fat coal are: volatile matter 31% to 38%, G value 95 to 100, Y value 25 to 32 mm, maximum fluidity α max The coal ash composition has a catalytic index (MCI) value greater than 6%.

4. The method for using Russian coal in a heat recovery coke oven according to claim 1, characterized in that: The indicators of the selected Russian lean coal are: volatile matter 19% to 20%, G value 75 to 80, Y value 10 to 14 mm, maximum fluidity α max The flow rate is 0-100 dd / min, the total content of K2O+Na2O+Fe2O3+CaO+MgO in the coal ash is greater than 18wt% or the catalytic index MCI value of the coal ash is greater than 6%.

5. The method for using Russian coal in a heat recovery coke oven according to claim 1, characterized in that: The indicators of the selected Russian lean coal are: volatile matter 14% to 16%, G value 0, Y value 0mm, maximum fluidity α max It is 0dd / min, the total content of K2O+Na2O+Fe2O3+CaO+MgO in the coal ash components is <12wt% and the catalytic index MCI value of the coal ash components is <3%.

6. The method for using Russian coal in a heat recovery coke oven according to any one of claims 1 to 5, characterized in that: After the nine types of coal are blended and homogenized, the coal preparation and coking production are carried out according to the heat recovery coke oven process flow, which includes: crushing the blended coal, and the proportion of the coal less than 3mm after crushing accounts for 88wt% to 91wt%; then tamping, and the tamping bulk density is set at 1.00-1.05t / m 3 ; The coking time is 65 to 80 hours.

7. The method for using Russian coal in a heat recovery coke oven according to claim 6, characterized in that: The produced coke has CSR≥65%, M40≥90%, and other indicators meet the requirements of national standard first-grade coke.

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