Method for evaluating shrinkage of tamping coke cake by using side-opening coke oven and coal blending method

Abstract

The invention provides a method for evaluating the shrinkage of a tamping coke cake by using a side-opened coke oven and a coal blending method, belongs to the technical field of coal blending coking, and is characterized in that a shrinkage index is determined and a method for evaluating the shrinkage performance of coking coal is established by using the side-opened coke oven and measuring and calculating the size change condition of the coal cake in the width direction of a carbonization chamber after the coal cake forms the coke cake. The coal blending is guided by combining the ratio (active-inert ratio) of the active component to the inert component of the blended coal, the interval distribution of the random reflectivity (Rran) of the vitrinite and the shrinkage index, so that the blended coal has good shrinkage performance, the coke pushing current is reduced, the smooth coke pushing is ensured, the structural integrity of a furnace body is protected, and the service life of a coke oven is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of coal blending for coking, and specifically discloses a method for evaluating the shrinkage of rammed coke cakes by using a side-opening coke oven and a coal blending method. Background Art

[0002] The ramming coking process adds a large amount of weakly sticky coal and high-volatile coal during the coal blending process, resulting in large volatile matter and poor bonding of the blended coal. During the coking heating process, volatile gases are precipitated. Due to the large bulk density of coal cakes and the narrow gaps between coal particles, gas escape is blocked, and a large expansion pressure is generated in the coal cakes. The coal cakes expand and squeeze the wall of the carbonization chamber. During the semi-coke contraction stage, the coke cakes contract and form a certain gap with the wall of the carbonization chamber. If the blended coal has poor contraction in the width direction of the carbonization chamber, and the gap is small or there is no gap, the friction between the coke and the wall of the carbonization chamber is increased during the coke pushing process, which hinders the coke pushing, resulting in excessive coke pushing current, and damage to the wall of the carbonization chamber, resulting in erosion and straight cracks on the wall of the carbonization chamber at the 2nd to 4th fire channel, and severe perforation. It has an important impact on the safe production and longevity of the coke oven.

[0003] Therefore, studying the shrinkage of the blended coal in the carbonization chamber during ramming coking is of great significance for smooth coke pushing and extending the life of the coke oven.

[0004] Patent 201510943379.4 proposes a method for coking coal blending to control the shrinkage of coal entering the furnace. The coal blending scheme is determined by comparing the shrinkage rate of the blended coal with that of the benchmark coal sample, and the blended coal index is controlled by adjusting the X value of the blended coal, the proportion of the volatile coarse-grained mosaic structure, and the proportion of fat coal, 1 / 3 coking coal and gas coal to ensure the shrinkage of the blended coal. Patent 201610288577.6 uses the volume curve of the coking coal colloid layer, X value and coke optical structure to control the blended coal index, measure the height of the blended coal cake and coke cake, draw a shrinkage curve, and compare the newly built coke oven with the same or similar coke ovens compared with the shrinkage rate of the coke oven with smooth coke pushing to determine whether the coal blending scheme can ensure the smooth coke cake pushing. The two patent methods use the height values ​​of the coal cake and coke cake to calculate the shrinkage, that is, only the height shrinkage is considered, and the width change of the coal cake in the carbonization chamber is not considered, which cannot fully simulate the actual production of the ramming coke oven.

[0005] Patent 202110474541.8 uses a barrel-shaped heating furnace body to evaluate shrinkage by measuring the changes in the diameter of coal cakes and coke cakes before and after coking. This method can evaluate the shrinkage of coking coal to a certain extent, but the barrel-shaped heating body, the heating method and the expansion and contraction method of the furnace coal are different, and there are certain differences from the actual coke oven.

[0006] Patent 201220477556.6 developed a 40kg test coke oven that can measure the expansion pressure of coking coal. It added a coal cake width shrinkage measurement system, which can measure the shrinkage of the coal cake. However, the tightness, service life and measurement accuracy of the equipment all need to be verified, and it is difficult to promote and implement. There is no explanation on how to evaluate the shrinkage of coal cakes based on the measurement results, and how the results can guide the application of coal blending for coking needs to be improved. Summary of the invention

[0007] The present invention provides a method for evaluating the shrinkage of rammed coke cake using a side-opening coke oven and a coal blending method, which at least solves the following technical problems:

[0008] 1. The width change of coal cake in the carbonization chamber is not considered, and the actual production situation of ramming coke oven cannot be fully simulated;

[0009] 2. The barrel-shaped heating body has a heating method that is different from the expansion and contraction method of the furnace coal, which is somewhat different from the actual coke oven;

[0010] 3. There is no explanation on how to evaluate the shrinkage of coal cakes based on the measurement results of the widthwise shrinkage of coal cakes, and how the results can guide the application of coal blending for coking needs to be improved.

[0011] The present invention provides a method for evaluating the shrinkage of rammed coke cake by using a side-opening coke oven, comprising the following steps:

[0012] S1, crushing single coal

[0013] For weakly sticky coal, 1 / 2 medium sticky coal, gas coal, lean coal, lean lean coal and lean coal, the proportion of particles less than 0.5mm after crushing is 50% to 70%, and the proportion of particles less than 3mm is 90% to 95%; for 1 / 3 coking coal, fat coal and coking coal, the proportion of particles less than 0.5mm after crushing is 10% to 35%, and the proportion of particles less than 3mm is 85% to 90%;

[0014] S2, mixed humidity control

[0015] The crushed single-species coal is uniformly mixed according to the designed mass ratio, and the moisture content of the mixed coal sample is adjusted to 11% to 13%;

[0016] S3, coal loading

[0017] The coal loading vehicle used for loading coal comprises a vehicle frame, a coal-hauling bottom plate, a metal coal box and a coal pushing rod; the coal-hauling bottom plate is a rectangular plate-shaped structure, fixed on the vehicle frame, with a height consistent with the bottom height of the carbonization chamber in the side-opening coke oven, and a width consistent with the width of the carbonization chamber; the metal coal box comprises a first fixed baffle, a second fixed baffle, a detachable baffle and a movable baffle; the first fixed baffle and the second fixed baffle are fixed on the coal-hauling bottom plate, parallel to the length direction of the coal-hauling bottom plate, the distance between the inner wall of the first fixed baffle and the inner wall of the second fixed baffle is L0, the distance between the inner wall of the first fixed baffle and the first long edge of the coal-hauling bottom plate is L1, and the distance between the inner wall of the second fixed baffle and the second long edge of the coal-hauling bottom plate is L2; ​​the detachable baffle is detachably connected to the short edges of the first fixed baffle and the second fixed baffle; the movable baffle is located between the first fixed baffle and the second fixed baffle, and is in sliding contact with the inner wall of the first fixed baffle and the inner wall of the second fixed baffle; the coal pushing rod is fixedly connected to the movable baffle;

[0018] Weigh the mixed coal sample according to the preset mass and divide it into multiple portions. Before loading the coal, mark the paper coal box along the height direction according to the total height of the coal loading and the number of mixed coal samples to divide the paper coal box into multiple layers. Load the paper coal box into the metal coal box of the coal loading vehicle, put multiple mixed coal samples into the paper coal box in turn, and compact each mixed coal sample to the mark line of the corresponding height to complete the production of coal cakes;

[0019] S4, coking furnace

[0020] After the side-opening coke oven is kept at a constant temperature between 870℃ and 890℃ for 1 hour, open the coke oven door, align the coal-carrying bottom plate of the coal-loading car with the carbonization chamber of the side-opening coke oven, open the removable baffle of the coal-loading car, push the coal pusher, push the coal cake into the carbonization chamber, close the coke oven door, start the temperature rise program of the side-opening coke oven, and start coking;

[0021] S5, determination of contraction index

[0022] After coking, measure the distance L between the two side walls and the coke cake in the width direction of the carbonization chamber. 10 and L 20 , and use the shrinkage index formula to calculate the shrinkage index of the blended coal:

[0023] The formula for the contraction index is: α = (L1 + L2) / (L0 + L 10 +L 20 )×100%.

[0024] In the above method of evaluating the shrinkage of rammed coke cake using a side-opening coke oven, when the shrinkage index of the blended coal is less than 9.4%, the shrinkage is good; between 9.4% and 15.4%, the shrinkage is average; when greater than 15.4%, there is no shrinkage.

[0025] In the above-mentioned coal loading car, the outer walls of the first fixed baffle and the outer walls of the second fixed baffle are both provided with card slots; the inner wall of the detachable baffle is provided with a card block, and the outer wall is provided with a handle, and the card block is plugged into and matched with the card slot.

[0026] In the above-mentioned coal loading car, the metal coal box is located in the middle of the coal-hauling bottom plate.

[0027] In the above method for evaluating the shrinkage of rammed coke cake using a side-opening coke oven, the side-opening coke oven is a 40 kg side-opening coke oven.

[0028] The present invention also provides a coal blending method, which sets different coal blending schemes and uses the active-inert ratio, vitrinite random reflectivity interval distribution and shrinkage index of the blended coal to determine whether the coal blending scheme can achieve coke pushing:

[0029] When the active-inert ratio is less than 1.7, the random reflectivity of the vitrinite group in the range of 0.6-0.9 accounts for 40%-60%, the random reflectivity of the vitrinite group in the range of greater than 1.5 accounts for 2%-6%, and the shrinkage index is less than 15.4%. The coal blending scheme can achieve coke pushing;

[0030] When the active-inert ratio is greater than 1.7, the random reflectivity of the vitrinite group in the range of 0.6-0.9 accounts for 20%-40%, the random reflectivity of the vitrinite group in the range greater than 1.5 accounts for 5%-10%, and the shrinkage index is less than 9.4%. The coal blending scheme can achieve coke pushing;

[0031] The shrinkage index is obtained by the above-mentioned method for evaluating the shrinkage of rammed coke cake using a side-opening coke oven.

[0032] Compared with the prior art, the present invention has the following beneficial effects.

[0033] 1. The shrinkage of coal cakes in the width direction of the carbonization chamber was evaluated, which can more comprehensively simulate the actual production situation of the ramming coke oven.

[0034] 2. Use the company's side-opening test coke oven without increasing investment. The side-opening coke oven has a certain gap between the coal cake and the wall of the carbonization chamber, which better simulates the process mode of ramming coking, is more in line with the actual working conditions of the coke oven, and is more instructive for ramming enterprises.

[0035] 3. By measuring and calculating the change in the gap between the coal cake and the furnace wall after coking, a shrinkage index is established to better evaluate the width shrinkage of the coal sample in the carbonization chamber. The operation is simple.

[0036] 4. Combine the active-inert ratio of the blended coal, the random reflectivity interval distribution of the vitrinite group and the shrinkage index to adjust the coal blending structure to ensure smooth coke cake pushing and smooth production. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 This is a front view of a coal-loading car;

[0039] Figure 2 for Figure 1 A top view of

[0040] Figure 3 for Figure 2 A partial enlarged view of

[0041] Figure 4 It is a schematic diagram of the distance between the side-loaded coke oven coal cake (coke cake) and the carbonization chamber;

[0042] Figure 5 for Figure 4 A partial enlarged view of

[0043] Figure 6 Schematic diagram of a paper coal box.

[0044] In the figure: 1.1-frame; 1.2-coal-hauling bottom plate; 1.3-coal-pushing rod; 1.4-first fixed baffle; 1.5-second fixed baffle; 1.6-detachable baffle; 1.7-movable baffle; 1.8-slot; 1.9-block; 1.10-handle; 2-side-opening coke oven; 2.1-carbonization chamber; 3-coal cake; 4-paper coal box; 5-coke cake. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Example 1

[0047] The present embodiment provides a method for evaluating the shrinkage of rammed coke cake using a side-opening coke oven, comprising the following steps.

[0048] S1, crushing single coal

[0049] For weakly sticky coal, 1 / 2 medium sticky coal, gas coal, lean coal, lean lean coal and lean coal, the proportion of particles less than 0.5mm after crushing is 50%~70%, and the proportion of particles less than 3mm is 90%~95%; for 1 / 3 coking coal, fat coal and coking coal, the proportion of particles less than 0.5mm after crushing is 10%~35%, and the proportion of particles less than 3mm is 85%~90%.

[0050] S2, mixed humidity control

[0051] The crushed single-type coal is evenly mixed according to the designed mass ratio, and the moisture content of the mixed coal sample is adjusted to 11% to 13%.

[0052] S3, coal loading

[0053] The coal loading vehicle used for loading coal comprises a vehicle frame 1.1, a coal-carrying bottom plate 1.2, a metal coal box and a coal-pushing rod 1.3; the coal-carrying bottom plate 1.2 is a rectangular plate-shaped structure, fixed on the vehicle frame 1.1, and its height is consistent with the bottom height of the carbonization chamber 2.1 in the side-opening coke oven 2, and its width is consistent with the width of the carbonization chamber 2.1; the metal coal box comprises a first fixed baffle 1.4, a second fixed baffle 1.5, a detachable baffle 1.6 and a movable baffle 1.7; the first fixed baffle 1.4 and the second fixed baffle 1.5 are fixed on the coal-carrying bottom plate 1.2, parallel to the length direction of the coal-carrying bottom plate 1.2, between the inner wall of the first fixed baffle 1.4 and the inner wall of the second fixed baffle 1.5 The distance between the inner wall of the first fixed baffle 1.4 and the first long edge of the coal-dragging bottom plate 1.2 is L0, the distance between the inner wall of the second fixed baffle 1.5 and the second long edge of the coal-dragging bottom plate 1.2 is L2; ​​L1 and L2 are the gaps between the coal cake 3 and the carbonization chamber 2.1 along the width direction; the detachable baffle 1.6 is detachably connected to the short edges of the first fixed baffle 1.4 and the second fixed baffle 1.5; the movable baffle 1.7 is located between the first fixed baffle 1.4 and the second fixed baffle 1.5, and is in sliding contact with the inner walls of the first fixed baffle 1.4 and the second fixed baffle 1.5; the coal pushing rod 1.3 is fixedly connected to the movable baffle 1.7.

[0054] In the above-mentioned coal loading car, the outer walls of the first fixed baffle 1.4 and the second fixed baffle 1.5 are both provided with a slot 1.8; the inner wall of the detachable baffle 1.6 is provided with a block 1.9, and the outer wall is provided with a handle 1.10, and the block 1.9 is plugged into the slot 1.8.

[0055] In the above-mentioned coal loading vehicle, the metal coal box is located in the middle of the coal-carrying bottom plate 1.2.

[0056] Weigh the mixed coal sample according to the preset mass and divide it into multiple portions. Before loading the coal, mark the paper coal box 4 along the height direction according to the total height of the coal loading and the number of mixed coal samples to divide the paper coal box 4 into multiple layers. Load the paper coal box 4 into the metal coal box of the coal loading truck, and put multiple mixed coal samples into the paper coal box 4 in turn. Compact each mixed coal sample to the marked line of the corresponding height to complete the production of the coal cake 3.

[0057] S4, coking furnace

[0058] After the side-opening coke oven 2 is kept at a constant temperature between 870°C and 890°C for 1 hour, the coke oven door is opened, the coal-drawing bottom plate 1.2 of the coal-loading car is aligned with the carbonization chamber 2.1 of the side-opening coke oven 2, the detachable baffle 1.6 of the coal-loading car is opened, the coal-pushing rod 1.3 is pushed, the coal cakes are pushed into the carbonization chamber 2.1, the coke oven door is closed, the temperature-raising program of the side-opening coke oven 2 is started, and coking begins.

[0059] S5, determination of contraction index

[0060] After the coking is completed, the distance L between the two side walls of the carbonization chamber 2.1 and the coke cake 5 in the width direction is measured. 10 and L 20 , and use the shrinkage index formula to calculate the shrinkage index of the blended coal:

[0061] The formula for the contraction index is: α = (L1 + L2) / (L0 + L 10 +L 20 )×100%.

[0062] In the above method of evaluating the shrinkage of rammed coke cake using a side-opening coke oven, when the shrinkage index of the blended coal is less than 9.4%, the shrinkage is good; between 9.4% and 15.4%, the shrinkage is average; when greater than 15.4%, there is no shrinkage.

[0063] In the above method for evaluating the shrinkage of rammed coke cake using a side-opening coke oven, the side-opening coke oven 2 is a 40 kg side-opening coke oven.

[0064] Example 2

[0065] This embodiment provides a coal blending method, which sets different coal blending schemes, and uses the active-inert ratio (ratio of active components to inert components) and the random reflectance (R ran ) The interval distribution and contraction index determine whether the coal blending scheme can achieve coking:

[0066] When the active-inert ratio is less than 1.7, the random reflectivity of the vitrinite group in the range of 0.6-0.9 accounts for 40%-60%, the random reflectivity of the vitrinite group in the range of greater than 1.5 accounts for 2%-6%, and the shrinkage index is less than 15.4%. The coal blending scheme can achieve coke pushing;

[0067] When the active-inert ratio is greater than 1.7, the random reflectivity of the vitrinite group in the range of 0.6-0.9 accounts for 20%-40%, the random reflectivity of the vitrinite group in the range greater than 1.5 accounts for 5%-10%, and the shrinkage index is less than 9.4%. The coal blending scheme can achieve coke pushing;

[0068] The shrinkage index is obtained by the above-mentioned method for evaluating the shrinkage of rammed coke cake using a side-opening coke oven.

[0069] Example 3

[0070] The gas coal, lean coal and poor lean coal used in coal blending are crushed to a particle size less than 0.5mm, accounting for 55%, and the particle size less than 3mm accounting for 92%; 1 / 3 coking coal, fat coal and coking coal are crushed to a particle size less than 0.5mm, accounting for 15%, and the particle size less than 3mm accounting for 86%.

[0071] After weighing and mixing different types of coal according to different coal blending ratios, adjust the moisture content of the blended coal to 12% and mix it several times until it is uniform. The coal samples are loaded into the paper coal box 4 on the coal loading car in 4 batches, and each coal sample is compacted to the corresponding height mark line each time. The distance between the paper coal boxes 4 is measured as L0, and the distance from the inside of the paper coal box 4 to the edge of the coal-dragging bottom plate 1.2 is L1 and L2. After the side-opening coke oven 2 is kept at a constant temperature between 870℃ and 890℃ for 1h, the coal box is pushed into the carbonization chamber 2.1, the heating rate is set, and coking begins. After coking is completed, measure the distance L between the coke cake in the carbonization chamber 2.1 and the two sides of the carbonization chamber 2.1. 10 and L 20 , and use the shrinkage index formula to calculate the shrinkage index of the blended coal.

[0072] The ratio of active components to inert components in the blended coal (active-inert ratio) and the random reflectance of the vitrinite (R ran ) interval distribution and contraction index are used to guide coal blending and ensure smooth coke pushing.

[0073] The indicators of 1# blended coal are shown in Table 1.

[0074] Table 1 1# blended coal index

[0075]

[0076] From Table 1, we can see that the active-inert ratio (0.88) of the 1# coal blending scheme is less than 1.7, R ran In the range of 0.6 to 0.9, the proportion is (45.6), 40% to 60%, R ran The range greater than 1.5 accounts for (4.6) 2% to 6%, and the shrinkage index (10.1%) is less than 15.4%. The shrinkage is good, which is conducive to the focus pushing operation.

[0077] The indicators of 2# blended coal are shown in Table 2.

[0078] Table 2 2# blended coal index

[0079]

[0080] From Table 2, we can see that the active-inert ratio (1.94) of the 2# coal blending scheme is greater than 1.7, R ran In the range of 0.6 to 0.9, the proportion is (33.2), 20% to 40%, R ran The range greater than 1.5 accounts for (7.7) 5% to 10%, and the shrinkage index (8.3%) is less than 9.4%. The shrinkage is good, which is conducive to the focus pushing operation.

[0081] The indicators of 3# blended coal are shown in Table 3.

[0082] Table 3 3# blended coal index

[0083]

[0084]

[0085] From Table 3, we can see that the active-inert ratio (0.79) of the 3# coal blending scheme is less than 1.7, R ran In the range of 0.6 to 0.9, the proportion is (50.3), 40% to 60%, R ran The proportion of the interval greater than 1.5 is (8.6), which exceeds the range of 2% to 6%. The shrinkage index (16.1%) is greater than 15.4%, and there is no shrinkage, which is not conducive to the focus pushing operation.

[0086] The indicators of 4# blended coal are shown in Table 4.

[0087] Table 4 4# blended coal index

[0088]

[0089] From Table 4, we can see that the active-inert ratio (1.87) of the 4# coal blending scheme is greater than 1.7, R ran In the range of 0.6 to 0.9, the proportion is (37.8) 20% to 40%, R ran The proportion of the interval greater than 1.5 is (10.5), which exceeds the range of 5% to 10%, and the shrinkage index (11.5%) is greater than 9.4%, which does not meet the overall indicator requirements and is not conducive to the pushing focus operation.

[0090] The indicators of 5# blended coal are shown in Table 5.

[0091] Table 5 5# blended coal index

[0092]

[0093] From Table 5, we can see that the active-inert ratio (1.58) of the 5# coal blending scheme is less than 1.7, R ranIn the range of 0.6 to 0.9, the proportion is (39.6) exceeding 40% to 60%, R ran The proportion of the interval greater than 1.5 is (10.6), which exceeds the range of 2% to 6%. The shrinkage index (17.3%) is greater than 15.4%, and there is no shrinkage, which is not conducive to the focus pushing operation.

[0094] Example 4

[0095] The difference between this embodiment and embodiment 3 is that the proportion of the weakly sticky coal, 1 / 2 medium sticky coal, gas coal and lean coal used for coal blending to be crushed to a particle size less than 0.5 mm is 51%, and the proportion of the particle size less than 3 mm is 91%; the proportion of 1 / 3 coking coal, fat coal and coking coal to a particle size less than 0.5 mm after crushing is 11%, and the proportion of the particle size less than 3 mm is 86%.

[0096] After weighing and mixing different types of coal according to different coal blending ratios, the moisture content of the blended coal is adjusted to 11.5%, and mixed several times until uniform.

[0097] The indicators of 6# blended coal are shown in Table 6.

[0098] Table 6 6# blended coal index

[0099]

[0100] From Table 6, we can see that the active-inert ratio (1.15) of the 6# coal blending scheme is less than 1.7, R ran In the range of 0.6 to 0.9, the proportion is (51.3), 40% to 60%, R ran The proportion of the interval greater than 1.5 is (3.9) 2% to 6%, and the shrinkage index (12.2%) is less than 15.4%. The shrinkage is average, and the focus is on the change of the pushing current.

[0101] The indicators of 7# blended coal are shown in Table 7.

[0102] Table 7 7# blended coal index

[0103]

[0104] From Table 7, we can see that the active-inert ratio (0.98) of the 7# coal blending scheme is less than 1.7, R ran In the range of 0.6 to 0.9, the proportion is (41.6), 40% to 60%, R ran The range greater than 1.5 accounts for (2.5) 2% to 6%, and the shrinkage index (16.3%) is greater than 15.4%, which means there is no shrinkage, which is not conducive to the focus pushing operation.

[0105] Example 5

[0106] The difference between this embodiment and embodiment 4 is that the proportion of 1 / 2 of the medium-sticky coal, gas coal, lean coal and poor lean coal used for blending to be crushed to a particle size less than 0.5 mm is 70%, and the proportion of the particle size less than 3 mm is 93%; the proportion of 1 / 3 of the coking coal, fat coal and coking coal to be crushed to a particle size less than 0.5 mm is 12%, and the proportion of the particle size less than 3 mm is 88%.

[0107] After weighing and mixing different types of coal according to different coal blending ratios, adjust the moisture content of the blended coal to 12%, and mix several times until it is uniform.

[0108] The indicators of 8# blended coal are shown in Table 8.

[0109] Table 8 8# blended coal index

[0110]

[0111] From Table 8, we can see that the active-inert ratio (1.98) of the 8# coal blending scheme is greater than 1.7, R ran In the range of 0.6 to 0.9, the proportion is (37.1), 40% to 60%, R ran The range greater than 1.5 accounts for (8.5) 5% to 10%, and the shrinkage index (8.8%) is less than 9.4%. The shrinkage is good, which is conducive to the focus pushing operation.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating the shrinkage of rammed coke cake using a side-opening coke oven, characterized in that: The steps include: S1, crushing single coal For weakly sticky coal, 1 / 2 medium sticky coal, gas coal, lean coal, lean lean coal and lean coal, the proportion of particles less than 0.5mm after crushing is 50% to 70%, and the proportion of particles less than 3mm is 90% to 95%; for 1 / 3 coking coal, fat coal and coking coal, the proportion of particles less than 0.5mm after crushing is 10% to 35%, and the proportion of particles less than 3mm is 85% to 90%; S2, mixed humidity control The crushed single-species coal is uniformly mixed according to the designed mass ratio, and the moisture content of the mixed coal sample is adjusted to 11% to 13%; S3, coal loading The coal loading car used for loading coal includes a car frame, a coal-carrying bottom plate, a metal coal box and a coal pusher; The coal-carrying bottom plate is a rectangular plate structure, fixed on the vehicle frame, with a height consistent with the bottom height of the carbonization chamber in the side-opening coke oven, and a width consistent with the width of the carbonization chamber; The metal coal box comprises a first fixed baffle, a second fixed baffle, a removable baffle and a movable baffle; The first fixed baffle and the second fixed baffle are fixed on the coal-hauling bottom plate, parallel to the length direction of the coal-hauling bottom plate, the distance between the inner wall of the first fixed baffle and the inner wall of the second fixed baffle is L0, the distance between the inner wall of the first fixed baffle and the first long edge of the coal-hauling bottom plate is L1, and the distance between the inner wall of the second fixed baffle and the second long edge of the coal-hauling bottom plate is L2; The detachable baffle is detachably connected to the short edges of the first fixed baffle and the second fixed baffle; The movable baffle is located between the first fixed baffle and the second fixed baffle, and is in sliding contact with the inner wall of the first fixed baffle and the inner wall of the second fixed baffle; The coal pushing rod is fixedly connected to the movable baffle; Weigh the mixed coal sample according to the preset mass and divide it into multiple portions. Before loading the coal, mark the paper coal box along the height direction according to the total height of the coal loading and the number of mixed coal samples to divide the paper coal box into multiple layers. Load the paper coal box into the metal coal box of the coal loading vehicle, put multiple mixed coal samples into the paper coal box in turn, and compact each mixed coal sample to the mark line of the corresponding height to complete the production of coal cakes; S4, coking furnace After the side-opening coke oven is kept at a constant temperature between 870℃ and 890℃ for 1 hour, open the coke oven door, align the coal-carrying bottom plate of the coal-loading car with the carbonization chamber of the side-opening coke oven, open the removable baffle of the coal-loading car, push the coal pusher, push the coal cake into the carbonization chamber, close the coke oven door, start the temperature rise program of the side-opening coke oven, and start coking; S5, determination of contraction index After coking, measure the distance L between the two side walls and the coke cake in the width direction of the carbonization chamber. 10 and L 20 , and use the shrinkage index formula to calculate the shrinkage index of the blended coal: The contraction index formula is: α = (L1 + L2) / (L0 + L 10 +L 20 )×100%.

2. The method for evaluating the shrinkage of rammed coke cake using a side-opening coke oven according to claim 1, characterized in that: When the shrinkage index of the blended coal is less than 9.4%, the shrinkage is good; between 9.4% and 15.4%, the shrinkage is average; when it is greater than 15.4%, there is no shrinkage.

3. The method for evaluating the shrinkage of rammed coke cake using a side-opening coke oven according to claim 1, characterized in that: The outer wall of the first fixed baffle and the outer wall of the second fixed baffle are both provided with a card slot; The inner wall of the detachable baffle is provided with a card block, and the outer wall is provided with a handle, and the card block is plugged and matched with the card slot.

4. The method for evaluating the shrinkage of rammed coke cake using a side-opening coke oven according to claim 1, characterized in that: The metal coal box is located in the middle of the coal-hauling bottom plate.

5. The method for evaluating the shrinkage of rammed coke cake using a side-opening coke oven according to claim 1, characterized in that: The side-opening coke oven is a 40Kg side-opening coke oven.

6. A coal blending method, characterized in that: Set different coal blending schemes, and use the active-inert ratio, random reflectivity interval distribution of vitrinite and shrinkage index of the blended coal to determine whether the coal blending scheme can achieve coking: When the active-inert ratio is less than 1.7, the random reflectivity of the vitrinite group in the range of 0.6-0.9 accounts for 40%-60%, the random reflectivity of the vitrinite group in the range of greater than 1.5 accounts for 2%-6%, and the shrinkage index is less than 15.4%. The coal blending scheme can achieve coke pushing; When the active-inert ratio is greater than 1.7, the random reflectivity of the vitrinite group in the range of 0.6-0.9 accounts for 20%-40%, the random reflectivity of the vitrinite group in the range greater than 1.5 accounts for 5%-10%, and the shrinkage index is less than 9.4%. The coal blending scheme can achieve coke pushing; The shrinkage index is obtained by the method for evaluating the shrinkage of rammed coke cake using a side-opening coke oven as described in claim 1.

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