CN115725314A - Method for controlling crushing particle size of high-volatile coking coal to participate in coal blending and coking - Google Patents
Method for controlling crushing particle size of high-volatile coking coal to participate in coal blending and coking Download PDFInfo
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Abstract
The invention discloses a method for regulating and controlling the crushing granularity of high-volatile coking coal to participate in coal blending and coking, which is characterized in that the granularity of the high-volatile coking coal is classified and controlled according to a key index Y value, the high-volatile coking coal is added into the conventional coal blending scheme, the use amount of the original high-proportion high-price fat coal and 1/3 coking coal is reduced, the function of the high-volatile coking coal with proper granularity in the coking process is fully exerted by utilizing the characteristics of the high-volatile coking coal with proper granularity, the quality of the coking coal is improved, the granularity regulating and controlling method is simple to operate, the classification granularity is reasonably controlled, and the coal blending scheme produces the coke with the same quality or better quality.
Description
Technical Field
The invention belongs to the technical field of coal blending coking, and particularly relates to a method for participating in coal blending coking by regulating and controlling the crushing granularity of high-volatile coking coal.
Background
The coking blending coal mainly comprises bituminous coal such as gas coal, gas fat coal, coking coal, 1/3 coking coal, lean coal and the like, each bituminous coal plays different roles in the dry distillation coking process, if the coking coal is a key basic coal type, the coking coal has obvious influence on the coke quality, and the fat coal promotes the expansion, contraction and the like of a colloid body in the coking process. Volatile component V daf >The low-price low-ratio coking coal with 37 percent is high-volatile coking coal which comprises gas coal and gas fat coal, the ratio of the gas coal and the gas fat coal in coking and coal blending is relatively low, the traditional coal blending technology is classified according to national standards, the gas coal is comprehensively subjected to unified crushing granularity control or blending according to self research, the coal blending structure is integrally adjusted, or the gas fat coal is further classified and blended according to indexes such as fluidity, expansion and the like.
In the national standard classification, the coal with Y more than 25mm in the range is defined as gas fat coal, and the coal with Y less than or equal to 25mm is defined as gas coal, for example, in the coking and coal blending method for controlling the volatile components of blended coal in the Chinese patent ZL201310472334.4, the coking coal with high volatile components is not subdivided, the use ratio of the coal with high volatile components is less, the use ratio of 1/3 coke, fat coal and coking coal is high, and the wear resistance of the coke is low. China published invention 202011072686.7 does not reasonably classify high volatile coal, and although more high volatile coal is used in the coal blending scheme, the coke quality is seriously reduced.
Disclosure of Invention
The method breaks through the national standard classification boundary, and reasonably utilizes the high-volatile coking coal resource according to the measurement data of the colloidal layer. The method is classified and controlled according to key indexes instead of coal types, and is added into the existing coal blending scheme, the characteristics of high-volatile coking coal with proper granularity are utilized, the function of the coking coal in the coking process is fully exerted, the shrinkage rate of the coking coal after charging is improved, or expensive 1/3 coking coal, fat coal and coking coal are replaced, the quality of the coking coal is improved, the granularity regulation and control method is simple to operate, the classification granularity is reasonably controlled, and the quality of the coking coal produced by the coal blending scheme is excellent.
The technical scheme for realizing the technical purpose of the invention is as follows: a method for regulating and controlling the crushing granularity of high-volatile coking coal to participate in coal blending and coking comprises the following specific steps:
(1) Measuring volatile components of coking coal, and selecting volatile components V daf Detecting the colloid layer index Y of the coking coal with high volatile matter content in the coking coal with the content of more than 37%, drawing a colloid layer volume curve, reading the softening temperature and the curing temperature, and measuring the volatile matter content and the granularity of the coking coal;
(2) And performing key index tests on other coking coals with volatile matters of less than 37 percent: carrying out microstructure test on the coking coal, carrying out volatile component and G value test on 1/3 coking coal, and carrying out G value test on lean coal;
(3) According to the parameters collected in the step (1), the particle size of the coking coal is regulated and controlled in the following mode:
when the Y value is 9-15 mm, or the colloid layer volume curve is kept in a smooth descending state before 730 ℃, and the softening temperature is lower than 330 ℃, the size is marked as coking coal No. 1, the maximum crushing granularity is controlled to be 5mm, the mass percentage of the coking coal particles with the granularity of 1mm after crushing is lower than 30%, and when the mass percentage of the coal particles with the granularity of 1mm in the original coking coal before crushing is more than or equal to 30%, the maximum crushing granularity is controlled to be 6mm;
when the Y value is 15-23 mm and the softening temperature is less than 330 ℃, marking as coking coal No. 2, and controlling the maximum crushing granularity to be 5mm;
when the Y value is more than 23mm, the softening temperature is less than 330 ℃, and the solid-soft temperature interval is more than 290 ℃, marking as coking coal No. 3, pre-screening, screening the coal particles with the particle size of 6mm, crushing the coal particles with the particle size of more than 6mm, wherein the mass percentage of the coal particles with the particle size of less than or equal to 6mm after crushing is more than or equal to 90 percent;
(4) And (3) selecting coking coal with coarse grain mosaic structure of more than 48%,1/3 coking coal with G >80 and lean coal with G >50 according to the test result of the step (2), and regulating the granularity of the coking coal according to the following modes:
and (3) controlling the granularity of other coking coals: the mass ratio of the coal particles with the crushed particle size of 3mm in the other volatile coking coal is 75 +/-3%;
(5) Classifying and blending the crushed coking coals:
when the coke cake shrinkage needs to be improved to 29-37 mm, the matching method comprises the following steps: 1/3 coking coal: 5% -23%; coal fertilizing: 5% -17%; coking coal: 40% -44%; lean coal: 12 to 14 percent; coking coal 1#:0% -8%; coking coal 2#:0% -18%; coking coal 3#: 0-16 percent of coking coal 1#, coking coal 2# and coking coal 3#, and the addition amount is more than or equal to 5 percent;
when the 1/3 coking coal consumption needs to be reduced by 5-15% and the coke quality CSR is ensured to be more than or equal to 66%, the blending method comprises the following steps: 1/3 coking coal: 5 to 15 percent; coal fertilizing: 8 to 13 percent; coking coal: 40 to 44 percent; lean coal: 12 to 14 percent; coking coal 1#: 3-8%, coking coal 2#: 0-16%, coking coal 3#:7 to 8 percent;
when the use amount of the fat coal needs to be reduced by 5-10 percent and the coke quality CSR is ensured to be more than or equal to 65 percent, the blending method comprises the following steps: 1/3 coking coal: 6 to 20 percent; coal fertilizing: 5 to 10 percent; coking coal: 40 to 44 percent; lean coal: 12 to 13 percent; coking coal 2#:0 to 18 percent; coking coal 3#:7 to 16 percent.
When the coke cake shrinkage is required to be improved to 32-37 mm and the coke quality CSR is ensured to be more than or equal to 67%, the matching method comprises the following steps:
1/3 coking coal: 8 to 20 percent; coal fertilizing: 5% -15%; coking coal: 42 to 44 percent; lean coal: 12 to 13 percent; coking coal 1#:3% -8%; coking coal 2#:0 to 15 percent; coking coal 3#:7 to 16 percent.
Compared with the prior art, the technical scheme of the invention has the following advantages and beneficial effects:
1. the technical personnel find out in a plurality of researches that the Y value can not absolutely reflect the function of the Y value in the coking process, and comprehensively reflects the coal quality by combining the indexes such as softening temperature, solid-soft interval and the like in the colloid detection process, so that the coal quality can meet the requirements of gas coal and gas fat coal, namely high volatile coking coal can also play the expansion role of the fat coal in the coking process, and the coke cake shrinkage is ensured.
2. The invention regulates and controls the crushing particle size of coking coal, and avoids the problem that the coal quality is taken as a starting point for adjusting the coal blending structure and the hardness or particle size distribution is taken as a main point for particle size crushing in the current coking coal blending, so that the advantages of different coal qualities of the coking coal cannot be fully exerted; the crushing particle size is too large, the small particles of coking coal cannot be fully mixed or the crushing particle size is too small, so that the small particles of coking coal are excessively increased, and the problems of coal dust increase and coal blending bulk density decrease are caused. On the basis of avoiding the influence on production caused by the fact that coal particles are excessively finely crushed and coal dust is increased, the whole blending of the blended coal material is guaranteed, the coal particles with different coal quality characteristics are reasonably distributed in the dry distillation process of the blended coal, the coke pushing process shrinks and expands, and the coke quality is improved.
3. Compared with the traditional coal blending, the fineness control is mainly used, namely the mass percentage of the coal material with the granularity of less than 3mm in the blended coal is between 70 and 80 percent. The particle size control level of the coking coal is larger, and is different from the existing whole particle size control technology of blended coal and the pre-crushing technology of the coking coal with a certain particle size or higher hardness.
Drawings
FIG. 1 is a two-cup colloidal layer index meter;
FIG. 2 is a colloidal layer volume curve;
FIG. 3 is a graph showing the type of volume curve obtained by colloidal layer measurement; a-smooth descent type, b-smooth descent type, c-wave type, d-micro wave type, e-zigzag type, f-mountain type, g, h-mountain mixed type;
FIG. 4 is a graph of G values for high volatile coals of different particle sizes;
FIG. 5 is a colloidal layer volume curve of coking coal # 1;
FIG. 6 is a colloidal layer volume curve for coking coal # 2;
FIG. 7 is a colloidal layer volume curve of coking coal # 3;
the device comprises a base 1, a horizontal screw 2, a vertical column 3, an asbestos plate 4, a lower brick pile 5, a jointing clamp 6, a 7-silicon carbide rod 8, an upper brick pile 9, a coal cup 10, a thermocouple iron tube 11, a pressing plate 12, balance thallium 13, a movable shaft 17, a lever 14, a probe 15, a pressure plate 16, a direction control rod 18, a direction column 19, a weight hook 20, a recording pen 21, a recording drum 22, a recording rotating cylinder 23, a recording rotating cylinder support 24, a weight 25 and a fixing screw.
Detailed Description
The present invention is further described in detail below with reference to specific examples so that those skilled in the art can more clearly understand the present invention.
The following examples are provided only for illustrating the present invention and are not intended to limit the scope of the present invention. All other embodiments obtained by a person skilled in the art based on the specific embodiments of the present invention without any inventive step are within the scope of the present invention.
In the control method of the following embodiment, the colloidal layer index of coal is measured according to the specification of GB/T479-2000, and the measurement is carried out by using a double-cup colloidal layer index measuring instrument as shown in figure 1, step 1. When the preparation work is ready, a switch of a program temperature controller is turned on, the electricity is supplied for heating, and the temperature rising speed of the bottom of a coal cup 9 is controlled as follows: 8 ℃/min before 250 ℃, and raising the temperature to 250 ℃ within 30 min; after 250 ℃ at 3 ℃/min. The temperature was recorded every 10 min. In the period of 350-600 ℃, the difference between the actual temperature and the temperature to be reached should not exceed 5 ℃, and the difference should not exceed 10 ℃ in the rest time, otherwise, the experiment is abandoned. In the experiment, the time, the temperature and the time are recorded according to the time, and the calculation is started from 250 ℃, and the unit is min. And 2, when the temperature reaches 250 ℃, adjusting the screw 25 to enable the pen point of the recording pen 21 to contact the recording rotary drum 22, fixing the position of the recording rotary drum, rotating the recording rotary drum for one circle, marking a zero point line, aligning the pen point to the starting point, and starting to record the volume curve. And 3, for a common coal sample, measuring the colloid layer surface, starting a few minutes after the volume curve begins to descend, stopping when the temperature rises to about 650 ℃, properly stopping the measurement of the colloid layer surface when the volume curve of the sample is in a mountain shape or a colloid with high fluidity is generated, generally stopping the measurement of the upper layer surface and the lower layer surface for 2-4 times respectively after the large thickness of the colloid layer appears, and tightly blocking the detection hole on the pressure disc 16 by using an asbestos rope or asbestos wool to avoid the colloid overflow. And 4, when the upper layer surface of the colloidal layer is measured, the probe graduated scale is placed on the pressing plate 11, the probe 15 is carefully inserted into the paper tube through the small holes on the pressing plate 11 and the pressure disc 16, and the paper tube is gently downwards detected until the lower end of the probe is contacted with the colloidal layer surface (the upper layer surface with resistance). The number of millimeters (which is the distance from the layer to the bottom of the cup) of the scale of the probe is read, the reading is filled into the column of 'the upper layer of the colloidal layer' in the record table, and the time for measuring the layer is recorded at the same time. And 5, when measuring the lower layer surface of the colloidal layer, firstly measuring the upper layer surface by using a probe 15, then slightly penetrating the colloidal body to the semi-colloidal surface (the hand feeling resistance is obviously increased to the lower layer surface), filling the reading into a column of the lower layer surface of the colloidal layer in a recording table, and simultaneously recording the time for measuring the layer surface. Care should be taken to slowly pull the probe 15 through and out of the colloidal layer. When the coal gas is drawn out, the coal gas is slightly rotated to prevent the coal gas brought out of the colloid or accumulated in the colloid layer from suddenly escaping so as to avoid damaging the shape of the volume curve and influencing the position of the layer. And 6, determining the frequency of measuring the upper layer surface and the lower layer surface of the colloidal layer according to the shape of the volume curve recorded by the rotating drum 22 and the characteristics of the colloidal body. And 7, stopping the measurement experiment when the temperature is 730 ℃, closing the electric door, taking down the code removing device 12, cooling the instrument, and if the measurement is needed again, completely cooling the upper brick pile to the room temperature. (or can be done by changing another brick pile); step 8, in the test, when a large amount of coal gas is separated out from the cup bottom (hot side), blowing air to the electric heating element to prevent the beaker of the silicon carbide rod 7; step 9. The test gel overflows onto the pressure plate 16 or the gel layer in the paper tube rises suddenly. The test should be repeated.
The softening temperature is obtained from the volume curve of the colloidal layer as shown in fig. 2, and based on the "zero line", when the volume curve decreases by 0.5mm, the temperature is the softening temperature, the volume curve stops expanding or contracting, that is, the temperature when the pressure plate stops moving is the curing temperature, a solid-soft interval is between the curing temperature and the softening temperature, and the volume change amount between the softening temperature and the curing temperature is the volume shrinkage degree X.
The adhesion index G was determined according to the GB/T5447 specification.
The invention is based on V daf >The 37% high volatile coking coal, namely the coking coal with low price and low proportion is subjected to particle size regulation and classification for use. The embodiment of the invention breaks through the national standard classification boundary, utilizes the colloidal layer measurement data to regulate and control the granularity, and then reasonably utilizes the coking coal resource. According to the national standard classification, the maximum thickness Y of the colloidal layer is more than 25mm and is defined as gas fat coal, and the maximum thickness Y of the colloidal layer is less than or equal to 25mm and is defined as gas coal, but in multiple practical researches, the maximum thickness Y of the colloidal layer can not absolutely reflect the function of coking coal in the coking process, and the coal quality is comprehensively reflected by combining the indexes such as softening temperature, solid-soft interval and the like in the thickness detection process of the colloidal layer, namely the high-volatile coking coal can also play the expansion role of the fat coal in the coking process, and the shrinkage of a coke cake is ensured.
A method for regulating and controlling the crushing particle size of high-volatile coking coal comprises the following specific steps:
(1) Detecting volatile matter V of coking coal daf Selecting out volatile component V daf Detecting the colloidal layer index Y of the high-volatile coking coal in the coking coal with the concentration of more than 37%, drawing a colloidal layer volume curve, reading the softening temperature and the curing temperature, measuring the volatile matters and the granularity of the coking coal, and carrying out classification marking on the coking coal:
a. when the Y value is 9-15 mm, or the colloidal layer volume curve keeps a smooth descending state before 730 ℃ as shown in figure 5, and the softening temperature is less than 330 ℃, the value is marked as coking coal 1#; the gas coal has high volatile component, so the colloidal layer curve generally presents a smooth descending type, the gas is precipitated more and the shrinkage is larger, when the colloid in the gas coal increases, the melting condition is improved, the colloidal layer volume curve presents a microwave or wave type, and the gas coal presenting a wave type has relatively strong caking property.
b. When the Y value is 15-23 mm and the softening temperature is less than 330 ℃ as shown in figure 6, marking as coking coal 2#; as shown in FIG. 3, the volume curve of the colloidal layer is generally in the shape of "microwave" or "wave" or "zigzag", and is classified as 1/3 coking coal (and the comprehensive Y and volatile components are gas coal according to the national standard), and coking coal No. 2 can be used as 1/3 coking coal;
c. when the Y value is larger than 23mm and the softening temperature is smaller than 330 ℃ as shown in figure 7, and the solid-soft temperature interval is larger than 290 ℃, recording as coking coal 3#; as shown in FIG. 3, the colloidal layer volume curve is generally classified as "mountain" or "mountain" mixed type as gas coal or gas fat coal, which can be used as 1/3 coking coal;
table 1 shows coking coals No. 1, 2 and 3 selected according to the standard of the present invention.
TABLE 1
Volatile component V daf More than 37 percent of coking coal 1#, 2# and 3# are respectively screened according to the granularity<1mm、1-3mm、3-6mm、6-8mm、>8mm and 5 components in total, and measuring the granularity component and the caking index G of the coking coal.
As shown in FIG. 4, the coking coal has a reduced caking index G value after the granularity is more than 6mm, and the G value is obviously reduced when the granularity is less than 1 mm; therefore, when the crushing granularity of the coking coal is determined, the small-granularity coking coal cannot be excessively increased in the crushing process, and the crushing granularity is finally determined to be 6mm, but the mass ratio of coal particles with the granularity of <1mm is controlled. According to the purposes of not excessively crushing and being beneficial to improving the bulk density, when the crushing granularity is determined, the coal quality, the energy consumption, the granularity distribution before the coking and blending coal is crushed and the like are integrated, and finally the crushing granularity is determined comprehensively and is controlled to be 6mm.
Although the coking coal 1# has poor coal quality performance, as shown in fig. 5, the coking coal 1# is different from other most coking coals, the softening and melting areas of the colloidal substances of the coking coal 1# are wide, the softening temperature is early, the solidification is very late, the curve is still in a descending state until the experiment is ended at 730 ℃, and other coal particles can be well bonded to fill in gaps after being solidified in a high-temperature section of the coking process. The coal has small pores after coking, compact structure and no sponge, but the colloidal index Y value is lower and the bonding components are less.
The softening temperature of coking coal No. 2 and coking coal No. 3 is lower than 330 ℃, the softening temperature of other 1/3 coking coal and fat coal is higher than 360 ℃, the softening temperature of other 1/3 coking coal and fat coal is similar to the softening temperature of other 1/3 coking coal and fat coal, respectively, the colloidal layer volume curve waveform is similar, but the solid-soft temperature interval is obviously wider, plastic temperature ranges which are mutually connected and mutually overlapped can be formed when the coking coal No. 2 and the coking coal No. 3 are matched with other 1/3 coking coal and fat coal, respectively, the thickness of the colloidal body of the coking coal No. 2 and the coking coal No. 3 is similar to that of other 1/3 coking coal and fat coal, but the shrinkage degree is smaller, the colloidal body amount is kept rich, the colloidal body is thinner, and the detection process is shown in the colloidal layer detection process, the probe penetration resistance is small, the colloidal body is easy to flow out, but the thin colloidal body has better fluidity and spreadability among coal particles, and under the conditions of the same G value, Y value and the like, the bonding effect among the coal particles is better, so that the coke quality is better promoted, for example, the permeability of the colloidal body of coking coal No. 3 at 520-610 ℃ is better than that of fat coal, the large air holes in the coke are reduced, the CSR is improved, the colloidal body is more than that of coking coal No. 2, has certain viscosity and good thermal stability, can well fill the gaps among deformed coal particles, widen the temperature interval of the matched coal colloidal body, and is favorable for forming a whole by thermal polycondensation.
When the coking coal 2# and the coking coal 3# are evaluated by using the Gieseler fluidity, the accuracy of the coal quality reflection is greatly reduced due to the small coal consumption (5 g), the large difference with the coke oven production (four-side heating) and the like. If the mixed coal exists, the result difference of multiple times is large; when the colloidal body is thin and the fluidity is high, idling is often formed, the measurement result of the Gieseler fluidity exceeds the upper measurement limit, and the like.
(2) In addition, the high-volatile coking coal is usually large-particle and high-hardness granular coal, the crushing granularity is reduced, and the energy consumption is correspondingly increased while the crushing difficulty is increased. Meanwhile, the pulverized coal particles with the particle size of less than 1mm generated in the crushing process can adsorb the colloidal body in the coking process, so that the overall cohesiveness of the blended coal is reduced, namely the crushing particle size is too small, and the demand on the colloidal body is increased. In addition, the vitrinite group has small hardness and large brittleness and is easy to concentrate in a fine fraction, while the inertinite group has large hardness and small brittleness and is easy to concentrate in a coarse fraction. Therefore, as the particle size is reduced, the content of vitrinite is gradually increased, and the content of inertinite is gradually reduced. Since active components such as vitrinite are easily pulverized and concentrated in coal particles having a small particle size and inert components are contained in a large particle size, cohesiveness of fine coal is good, but ash and sulfur contents in a fine particle portion smaller than 1mm are high, thereby causing a decrease in cohesiveness of the coal in the fine particle portion. The hardness of the coking coal 1# and the coking coal 2# classified in the embodiment is higher than that of the coking coal 3# so that the inert components are more, the coking coal 1# and the coking coal 2# are less than that of fine-grained coal generated after the coking coal 3# is crushed under the same crushing degree, the proportion of the fine-grained coal needs to be increased for the coking coal 1# and the coking coal 2# so as to improve the caking property, and the crushing degree is set to be lower than that of the coking coal 3#.
Therefore, according to the parameters collected according to the step (1), the particle size of the coking coal is regulated and controlled according to the following modes:
controlling the maximum crushing granularity of coking coal No. 1 to be 5mm, controlling the mass percentage of coal particles with the granularity of 1mm after crushing to be less than 30%, and controlling the maximum crushing granularity to be 6mm when the mass percentage of coal particles with the granularity of 1mm in the original coking coal before crushing is more than or equal to 30%
Controlling the maximum crushing particle size of coking coal No. 2 to be 5mm;
controlling the maximum crushing granularity of the coking coal No. 3 to be 6mm, wherein the mass percentage of the coal particles with the granularity of less than or equal to 6mm after crushing is more than or equal to 90 percent;
controlling indexes of other coking coals in the blended coal:
because the coking coal is a coal blending framework, the coarse grain mosaic structure in the coking coal can ensure the quality of the coke; while the 1/3 coking coal with low volatile component and excellent caking property is beneficial to improving the CSR and M of the coke 10 。
Therefore, the key indexes of other coking coal with the volatile matter less than 37 percent are tested: carrying out microstructure test on the coking coal, carrying out volatile component and G value test on 1/3 coking coal, and carrying out G value test on lean coal;
selecting: coking coal, coarse grain mosaic >48%,1/3 coking coal, G >80, lean coal, G >50.
Controlling the particle size of other coking coals: the mass ratio of the coal particles with the crushed particle size of 3mm in other volatile coking coals is 75 +/-3 percent.
The 1/3 coking coal has high price, so that the coal blending cost is obviously reduced when the 1#, 2#, and 3# coking coal is substituted. The coking coals 2# and 1/3 coking coal, 3# coking coal and fat coal selected in the step (1) have common indexes such as caking index G value, Y value, fluidity and the like close to each other, but have different softening temperatures and/or softening ranges.
(3) And (3) carrying out coal blending and coking on the coking coals 1#, 2#, and 3# selected according to the table 1 and the step (2). And (3) controlling the particle size of the coking coal 1#, the coking coal 2# and the coking coal 3# according to the step (1).
TABLE 2 coal blending scheme of coking coals 1#, 2#, and 3#
| Number/kind of | Proportioning scheme | 2 | Comparative scheme a | Proportioning scheme 3 | Comparative scheme b |
| 1# coking coal | 3 | 3 | 4 | 4 | |
| |
15 | 7 | / | / | |
| Coking coal 3# | 8 | 8 | 16 | 8 | |
| 1/3 coking coal | 6 | 14 | 18 | 18 | |
| |
12 | 12 | 5 | 13 | |
| Coking coal | 42 | 42 | 44 | 44 | |
| |
14 | 14 | 13 | 13 | |
| G value of blended coal | 83 | 82 | 83 | 81 | |
| Shrinkage/mm of blended coal | 35 | 32 | 36 | 32 | |
| The coke quality index is as follows: abrasion resistance M 10 | 6.2 | 6.3 | 5.9 | 6.0 | |
| The coke quality index is as follows: post-reaction intensity CSR | 66.2 | 66.5 | 67.5 | 67.9 |
Table 2 shows that the coking coals 2# and 1/3 coking coals, 3# coking coals and fat coals with different softening temperatures and/or softening zones, which have similar common indexes such as a caking index G value, a Y value, a fluidity and the like, are subjected to a simple coal blending replacement test, and corresponding coke quality data are obtained by measurement after dry coke quenching.
As can be seen from the table, compared with the comparative scheme a, the coking coal 2# in the coal blending scheme 2# is similar to the single coking coal 1/3, and in the direct substitution case, the coking coal 2# contributes more to the G value of the blended coal, the shrinkage of the blended coal is obviously increased, the abrasion resistance M10 is improved, but the coke CSR has a tendency to be reduced due to the weakness of the coal quality. In production, the proportion of only one coal type is usually not adjusted, and the whole coal blending structure can be optimized and adjusted, so that the coke quality is ensured, the coal blending cost is reduced, and the coke cake shrinkage is ensured. The same characteristics are also observed in comparison scheme 3# with coal blending scheme b. The coking coal 1# has the same weakness in the contribution of coke thermal strength, but in the coal blending process, the weakness is overcome through particle size crushing and coal blending structure optimization adjustment, the advantages of the coking coal are fully utilized, and the coking coal is reasonably matched with each single coal to achieve the purposes of quality conservation, cost reduction and shrinkage conservation.
(4) The coking coals 1#, 2#, 3# and other coking coals are further blended and coked as shown in the following table 3, and the blending amount of each coking coal is mass percent.
TABLE 3
As can be seen from table 3 above, the blending ratio scheme 5 is the existing basic blending ratio, and the scheme contains high-price coal with higher blending amount, such as 1/3 coking coal with lower volatile content than gas coal, fat coal, coking coal and the like, and the quality CSR of the produced coke is 66.8%.
When the coke cake shrinkage needs to be improved to 29-37 mm, the matching method comprises the following steps: 1/3 coking coal: 5% -23%; coal fertilizing: 5% -17%; coking coal: 40% -44%; lean coal: 12 to 14 percent; coking coal 1#:0 to 8 percent; coking coal 2#:0% -18%; coking coal 3#:0 to 16 percent of the additive amount of the coking coal 1#, the coking coal 2# and the coking coal 3# is more than or equal to 5 percent; for example, the matching scheme 1#, the matching scheme 2#, the matching scheme 3#, the matching scheme 4#, the matching scheme 6#, and the matching scheme 7#;
when the coke cake shrinkage needs to be improved to 29-37 mm and the coke quality CSR is ensured to be more than or equal to 66 percent, the matching method is as follows, for example, the proportioning scheme 6: 5% coking coal 3# with medium-high Y value and high volatile matter and 3% coking coal 1# with low Y value and high volatile matter are added in the proportioning scheme 6 to ensure normal shrinkage of coke cakes and stable quality of coke, wherein the abrasion resistance M of the coke 10 6.0% and a post-reaction intensity CSR of 66.6%.
When the 1/3 coking coal consumption needs to be reduced by 5-15% and the coke quality CSR is ensured to be more than or equal to 66%, the blending method comprises the following steps: 1/3 coking coal: 5 to 15 percent; coal fertilizing: 8 to 13 percent; coking coal: 40 to 44 percent; lean coal: 12 to 14 percent; coking coal 1#: 3-8%, coking coal 2#: 0-16%, coking coal 3#:7 to 8 percent. When the usage amount of the 1/3 coking coal is less than 15 percent, 1/3 coking coal can be reduced by 1-2 percent for every 2 percent of coking coal 2 #.
Preferably, when the 1/3 coking coal consumption needs to be reduced by 6 percent, and the coke quality CSR is ensured to be more than or equal to 6At 6%, the preparation method is as follows: 3 percent of coking coal 1# with low Y value and high volatile matter, 16 percent of coking coal 3# with high Y value and high volatile matter, 2# of coking coal with high volatile matter, 8 percent of coking coal 3# with medium Y value and high volatile matter are added in the proportioning scheme 2, meanwhile, the proportioning of high-quality and high-price 1/3 coking coal is correspondingly reduced, the coke quality is stable, the coal blending cost is reduced, and the wear-resisting strength M of the coke 10 6.2% and a post-reaction intensity CSR of 66.2%.
When the use amount of the fat coal needs to be reduced by 5-10% and the coke quality CSR is ensured to be more than or equal to 67%, the blending method comprises the following steps: 1/3 coking coal: 6 to 20 percent; coal fertilizing: 5 to 10 percent; coking coal: 40 to 44 percent; lean coal: 12 to 13 percent; coking coal 2#:0 to 18 percent; coking coal 3#:7 to 16 percent; the fat coal can be reduced by 0.7-2% when the coking coal No. 3 is added by 1%.
Preferably, when the amount of the fat coal needs to be reduced by 5 percent and the coke quality CSR is ensured to be more than or equal to 66 percent, the blending method is as follows, for example, the blending scheme 3: in the proportioning scheme 3, 4 percent of coking coal with low Y value and high volatile matter 1#, 16 percent of coking coal with high Y value and high volatile matter 3#, simultaneously reduces the proportioning amount of high-quality high-price fat coal, has stable coke quality, reduces the coal proportioning cost, and has the wear-resisting strength M of the coke 10 5.9%, and the intensity CSR after the reaction was 67.5%.
When the amount of the fat coal needs to be reduced by 5 percent, the amount of the 1/3 coking coal needs to be reduced by 6 percent, and the quality CSR of the coke is ensured to be more than or equal to 65 percent, the matching method is as follows, for example, the proportioning scheme 4: in the proportioning scheme 4, the high-volatile coking coal 2# and the coking coal 3# with different Y values are combined for blending, so that the blending amount of high-quality coking coal is further reduced, the coal blending cost is reduced, the coke quality tends to be stable, the coal cost is further reduced, and the wear-resisting strength M of the coke is increased 10 6.3%, and the post-reaction intensity CSR is 65.3%.
As shown in Table 2, when the shrinkage of the basic blending ratio during production is small, the coal blending scheme is optimized and adjusted, and the addition amount of the coking coal 1# and/or the coking coal 2 #/or the coking coal 3# is increased by more than or equal to 5% by adopting the combination of the coking coal 1# and/or the coking coal 2 #/or the coking coal 3#. When the shrinkage is larger than that of the produced charged coal, the scheme 6 is adopted, and when the shrinkage of the charged coal needs to be further promoted, the furnace wall is protected, and the long service life of the coke furnace is ensured, the scheme 7 is adopted. The proportion is optimized, the stable quality of coke is ensured, and the shrinkage of the charged coal is good, thereby being beneficial to the long-term normal production of the coke oven.
Claims (2)
1. A method for regulating and controlling the crushing particle size of high-volatile coking coal to participate in coal blending coking is characterized by comprising the following specific steps:
(1) Measuring volatile components of coking coal, and selecting volatile components V daf Detecting the colloid layer index Y of the high-volatile coking coal in the coking coal with the concentration of more than 37%, drawing a colloid layer volume curve, reading the softening temperature and the curing temperature, and measuring the volatile matter and the granularity of the coking coal;
(2) And performing key index tests on other coking coals with volatile matters of less than 37 percent: carrying out microstructure test on the coking coal, carrying out volatile component and G value test on 1/3 coking coal, and carrying out G value test on lean coal;
(3) According to the parameters collected in the step (1), the particle size of the coking coal is regulated and controlled in the following mode:
when the Y value is 9-15 mm, or the volume curve of the gelatinous layer is kept in a smooth descending state before 730 ℃, and the softening temperature is lower than 330 ℃, the value is marked as coking coal No. 1, the maximum crushing granularity of the coking coal is controlled to be 5mm, the mass percentage of the coal particles with the granularity of 1mm after crushing is lower than 30%, and when the mass percentage of the coal particles with the granularity of 1mm in the original coking coal before crushing is more than or equal to 30%, the maximum crushing granularity is controlled to be 6mm;
when the Y value is 15-23 mm and the softening temperature is less than 330 ℃, marking as coking coal No. 2, and controlling the maximum crushing granularity to be 5mm;
when the Y value is more than 23mm, the softening temperature is less than 330 ℃, and the solid-soft temperature interval is more than 290 ℃, marking as coking coal No. 3, pre-screening, screening the coal particles with the particle size of 6mm, crushing the coal particles with the particle size of more than 6mm, wherein the mass percentage of the coal particles with the particle size of less than or equal to 6mm after crushing is more than or equal to 90 percent;
(4) And (3) selecting coking coal with coarse grain mosaic structure of more than 48%,1/3 coking coal with G >80 and lean coal with G >50 according to the test result of the step (2), and regulating the granularity of the coking coal according to the following modes:
other coking coal particle size control: the mass ratio of the coal particles with the crushed particle size of 3mm in the other volatile coking coal is 75 +/-3%;
(5) Classifying and blending the crushed coking coals according to the weight percentage:
when the coke cake shrinkage needs to be improved to 29-37 mm, the matching method comprises the following steps: 1/3 coking coal: 5% -23%; coal fertilizing: 5% -17%; coking coal: 40% -44%; lean coal: 12 to 14 percent; coking coal 1#:0% -8%; coking coal 2#:0% -18%; coking coal 3#: 0-16 percent of coking coal 1#, coking coal 2# and coking coal 3#, and the addition amount is more than or equal to 5 percent;
when the 1/3 coking coal consumption needs to be reduced by 5-15% and the coke quality CSR is ensured to be more than or equal to 66%, the blending method comprises the following steps: 1/3 coking coal: 5 to 15 percent; coal fertilizing: 8 to 13 percent; coking coal: 40 to 44 percent; lean coal: 12 to 14 percent; coking coal 1#: 3-8%, coking coal 2#: 0-16%, coking coal 3#:7 to 8 percent;
when the use amount of the fat coal needs to be reduced by 5-10 percent and the coke quality CSR is ensured to be more than or equal to 65 percent, the blending method comprises the following steps: 1/3 coking coal: 6 to 20 percent; coal fertilizing: 5 to 10 percent; coking coal: 40 to 44 percent; lean coal: 12 to 13 percent; coking coal 2#:0 to 18 percent; coking coal 3#:10 to 16 percent.
2. The method for participating in coal blending and coking by regulating and controlling the crushing particle size of the high-volatile coking coal according to claim 1,
when the coke cake shrinkage is required to be improved to 32-37 mm and the coke quality CSR is ensured to be more than or equal to 67%, the matching method comprises the following steps:
1/3 coking coal: 8 to 20 percent; coal fertilizing: 5% -15%; coking coal: 42% -44%; lean coal: 12 to 13 percent; coking coal 1#:3% -8%; coking coal 2#:0% -15%; coking coal 3#:7 to 16 percent.
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