CN103555352B - Coal blending coking method of weakly caking coal - Google Patents
Coal blending coking method of weakly caking coal Download PDFInfo
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Abstract
The invention discloses a coal blending coking method of weakly caking coal, in a coal blending process, the addition quantity of the weakly caking coal is 25-45wt%, the addition quantity of 1/3 coking coal is 5%-55wt%, and the addition quantity of lean coal is 10-25wt%; the coal blending method comprises the following steps: step one, detecting single coal for coking, computing active/inertia ratio A/I; step two, designing a coal blending ratio, performing the step three when the blended coal meets the requirement; step three, taking a sample of the blended coal, finishing the coal blending when the sample meets the condition that the ash content is less than 10.0%, the volatile content is 26.0%-32.0%, the total sulfur is less than 0.88%, the caking index is 58-72 and the maximum thickness of a gel layer is 10-15mm; step four, tamping the blended coal, filling in a coke oven for coking. The coal blending method disclosed by the invention is capable of realizing fine operation of coal blending and the high proportion addition of the weakly caking coal, enlarging the coking coal resource and improving the quality of caking coal, and the method is significant.
Description
Technical field
The invention belongs to Coal Petrography Blending field, be specifically related to a kind of weakly caking coal coal-blending coking method.
Background technology
Rich coal resources in China, but coking coal resource shortage, the coal resources that can be used in coking only account for the 26%-27% of coal resources in China total amount, wherein in coking coal resource, rich coal only accounts for 12.5%, coking coal only accounts for 23.3%, and larger with high volatile coal (bottle coal, 1/3 coking coal) proportion.Along with the increase year by year of China's coke output, the demand of coking coal resource is continued to increase, coking coal is in short supply, expands coking coal resource and has become the task of top priority.Widespread use Coal Blending Technology, is ensureing that under the prerequisite of coke quality, By Reasonable Utilizing Its Coal Resources also expands coking coal resource, becomes the important channel of China's raising coal resources utilising efficiency.Tamping coking technique can increase low rotten, high volatilization, the even non-caking coal amount of allocating into of weak viscosity, can expand the method for coking feed coal, the existing coke making process technology that has become a kind of maturation, and be widely used.
At present, instruct tamping coking coal blending by the technical analysis of routine analysis index, cohesiveness and the coking property etc. of coal, knowhow shows: the moisture controlled of mixed coal is at 8.0%-12.0%, ash content (A
d) be controlled at below 10.0% volatile matter (V
daf) be controlled at 24.0%-34.0%, sulfur (S
t.d) be controlled at below 1.0% caking index (G
r.I) being controlled at 55-75, thickness of colloidal matter layer (Y) is controlled at 10.0-17.0mm, and final contraction value (X value) is more than or equal to 30mm.Aforesaid method has been realized sxemiquantitative operation, can produce to a certain extent the product coke that meets prospective quality target, but can not fundamentally realize the precision operation that coking is produced, can not solve and mix the market unsettled and the quality accident that cause because of mixed coal and non-coking coal.
It is mainly to utilize the random reflectance of vitrinite distribution curve of coal that coal petrology instructs coal-blending coking technology, random reflectance of vitrinite distribution histogram and coal petrology micropetrological unit, or above index intensity index SI, component balanced index CBI, the lazy method that instructs coal-blending coking than A/I etc. in conjunction with relevant coal tar index of living calculated.Mainly contain Ah's Mosso husband method, summer Pyrrho method, island letter time youth's the grand vitrinite reflectance-maximum fluidity method of improved method and Tianjin, palace.Ah's Mosso husband method is, by coking property, lithotype of coal is divided into fusible component (∑ IK) and the large class of thinization component (∑ OK) two, has realized the method taking micropetrological unit quantitative analysis as basic prediction coke strenth.Summer Pyrrho method is to set up prediction coke stability graphic representation with component balanced index CBI and intensity index SI.Island letter time youth's improved method is to increase barrate strength index taking CBI-SI as basis
be used for predicting coke quality.Vitrinite reflectance-maximum fluidity method of Gong Jinlong is to predict the method for optimum coal mixture scheme with the maximum reflectivity Rmax of mixed coal, Ji Shi maximum fluidity MF.Shanghai Baosteel is on the basis of anthracology coal blending thought, determine Baosteel Blending of Coal Petrography thinking, select conventional coking coal, change coking test and the coal-blending coking experiment of inert material content, on the basis of experimental data, carry out theoretical analysis, determine Baosteel Blending of Coal Petrography parameter, carry out mathematical analysis with testing the data that obtain, obtain Baosteel Coke Model To Describe Strength of Blended, determine the method (Hu Desheng of Baosteel Blending of Coal Petrography, Wu Xinci, Dai Chaofa. the research of Baosteel Method of Coal Blend With Petrography. iron and steel .2001,36 (1): 1-5).The coking property of coal under different vitrinite reflectances and distribution scenario thereof is studied by Wuhan Iron and Steel Plant group, according to the maceral composition of the made coke of different ranks of coal, inquire into blending ratio and change the changing conditions that causes the distribution of coal reflectivity and coke structure performance, propose to be suitable for the reasonable coke making and coal blending scheme (Xue Gaifeng of Wuhan Iron and Steel Plant suitability for industrialized production, Xu Chuanzhi, Chen Peng. the applied research of Coal Petrography Blending in Wuhan Iron and Steel Plant is produced. Wuhan University Of Technology's journal (natural science edition) .2006,29 (6): 571-573).Ye Daomin etc., taking 200kg coke oven experimentation as basis, optimize standard activity component with Statistics Method, and random reflectance of vitrinite and standard deviation thereof have been set up the mathematical model of prediction coke strenth.Use and prove, the method prediction and to control the accuracy of grey intensity high, and simple (Ye Daomin, Xiao Wenzhao, etc. the prediction of Blending of Coal Petrography and coke strenth. fuel and chemical industry .1998,5:233-236).
Abroad, for the research of coal-blending coking, especially weak bonding bottle coal coal-blending coking, almost in halted state.The domestic fast development due to Iron And Steel Industry, and upgrading and the technical progress of coking technology equipment, the application of the modern techniquies such as TAMPING COKING PROCESS, anthracology coal blending technology, China's coking technology exploitation and industrialized development have obtained progressive fast.The development of domestic TAMPING COKING PROCESS and equipment and application, make polygamy weakly caking coal become possibility.
The coal-blending coking technical study of weakly caking coal and application also have certain report, the coke-oven plant's production practice of Handan Iron and Steel Co group prove, weakly caking coal replaces 1/3 coking coal of this factory, allocate 3% into and can ensure coke quality, reduction coking cost (Shao Youhui. the preliminary study of weakly caking coal coal-blending coking and production practice [J]. clean coal technology, 2005,11 (3): 41-44.).Lv Jing carries out pre-thermal upgrading to Datong District's weakly caking coal, improves metamorphic grade, improves cohesiveness and coking property, and mosaic structure's size of allocating upgrading coal gained coke into increases; The coking test of 5kg coke oven shows to allocate into 15% after the Datong coal of pre-thermal upgrading, the physical strength of the coke (Lv Jing that improves, Yu Jishun. Datong coal preheating modifying process and coking test research [J]. iron and steel, 2004,39 (2): 1-4).Shanxi sunlight coking production proves, it is feasible utilizing 3% weakly caking coal coal-blending coking to produce on the top dress coke oven taking lean coal as basic coal, and 3,000,000 tons/year of coking production abilities, can economize on the use of funds 1,780 ten thousand yuan/year, considerable benefit.(Liu Donghe. utilize the weakly caking coal coke making and coal blending experimental study .2007 China coking industry collection of thesis .261-265 of association).
In recent years, domestic weakly caking coal coal-blending coking technology has certain development, as " weakly caking coal destructive distillation coal blending coking technology " (201010617953.4) patented technology, this technique is first the weakly caking coal destructive distillation of low ash, low-sulfur, high ash melting point to be become to semicoke and be crushed to granularity to be less than 5mm, then by the semicoke generating after weakly caking coal destructive distillation with the weight ratio of 20%-40% and coking coal 30-40%, rich coal 20-30%, bottle coal 5-10%, other coals 5%, adding up to each composition weight is 100%, mix, pack together coke oven into and carry out high temperature carbonization 10-30 hour coking.This technique can reduce the consumption of high-quality coking coal, expands the scope of coal-blending coking coal, reduces coking cost; The volatile matter of adjusting flexibly mixed coal, improves coke cold and hot state intensity and lumpiness; Reduce ash content and the sulphur content of coke, improve the quality of coke-iron-rate and coke.
" a kind of method with low volatile weak cohesive or non-adhesive coal coking " (200410069197.0) patent of invention.This patented technology scheme is, first in feed coal, adds emulsified bitumen, and emulsified bitumen and feed coal are fully stirred, and mixes; The feed coal mixture that contains pitch mixing is sent into extrusion equipment and push, make emulsified bitumen with the abundant combination of feed coal; The feed coal mixture that contains emulsified bitumen after extruding is stacked, made emulsified bitumen infiltrate feed coal; The feed coal mixture of preparation is added in pit kiln, in isolated air conditions heating, carry out destructive distillation coking.
" coke making and coal blending method that a kind of weak cohesiveness coking coal participates in " (201210113978.X) patented technology, its concrete grammar is: taking the coking coarse grain pattern structure ratio of mixed coal as controlling index, by regulating coking coarse grain pattern structure in mixed coal to reach more than 60% coking coal 1#; Coking coal 2#, the adhesive index value > 85 of coking coarse grain pattern structure < 60%, dry ash-free basis volatile matter V
daf< 32%, rich coal and adhesive index value>=85 of maximum thickness of plastic layer Y value > 25mm, coking coarse grain pattern structure ratio reaches the consumption of 1/3 more than 40% coking coal, each coking coal is carried out to mixture and prepare mixed coal, not only can increase the consumption of weakly caking coal, rationally utilize ature of coal resource, significantly reduce coal blending cost, and do not adopting under the condition of coal damping, shaped coal technology and precomminution technique the CSR > 63% of coke oven institute coking charcoal more than 6 meters.
High metamorphic grade weak caking coal material participates in method (201210569367.6) patented technology of coal-blending coking, the method is: high metamorphic grade coal charge is crushed to different grain size gradient by (1), high metamorphic grade coal charge under each granularity is coordinated to coking with other agglutinating value(of coal) coal charges respectively, detect the quality index of gained coke, determine the best grinding particle size of high metamorphic grade coal charge; (2) after the non-high metamorphic grade coal charge in mixed coal is coordinated, point coal-forming 1 and coal 2 two portions; The high metamorphic grade coal charge being carefully crushed to after optimum size is coordinated with coal 1 by former proportioning and compression moulding coal cinder; The high metamorphic grade coal charge that is crushed to regular particle size is mixed into mixed coal 3 by former proportioning and coal 2; (3) by above-mentioned moulded coal piece with step (2) Suo Shu, coordinate coal charge 3 mixed cokings.The method can improve the amount of allocating into of weak caking coal material under the prerequisite that ensures coke quality, can play the effect that rationally utilizes coal resource, optimizing blending plan.
" a kind of coal-blending coking method of metallurgical coke " (200410061462.0) patented technology, the technical scheme of this invention is: adopt conventional coking process method, the material component of coke making and coal blending is by weight: weakly caking coal 0-15%, steam coal 0-10%, bottle coal 13-45%, rich coal 9-20%, coking coal 40-45%.Its dropping strength of the coke that the present invention produces M
40reach 77-78.5%, abrasive wear resistance M
10< 8.6%, reactivity reaches 35～37%, hot strength 45～55%, granularity is 25-40mm, 40-80mm secondary, meets 1000m
3and above blast furnace ironmaking needs with burnt.Expand the coal scope of coking coal, utilized non-coking coal and low grade coal to replace part coking coal, fully effectively utilized the coal resources of China, reduced coking cost.
" the Blending of Coal Petrography coking process of production low reactivity, high-heat strength coke " (201010203653.1) patented technology, its concrete steps: 1) the coking coal of variant kind, carry out index analysis, and the vitrinite reflectance of coal and macerals test: 2) carry out proportioning in the ratio in the vitrinite reflectance different distributions interval of coal; 3) get coal blending pattern detection coal blending adhesive index value, calculate the ratio with the component concentration Vt of coal blending vitrinite (%); 4) coal blending melting is compared not at 1.08-1.20, circulation second step; 5) shove charge coking.The recently method of the coal blending refining high-heat performance metallurgical coke of definite blending ratio of melting is introduced in this invention, can rationally use the coking coal of special genetic, and simple flow, easy handling, has stablized coke quality, makes coking coal resource reach reasonable use.
" a kind of method of anthracology coal blending " (200810048105.9) patented technology.Its concrete steps are: the first step, detect each single coking coal of planting, detect and comprise that fugitive constituent, bonding index G value, coke microstructure form; Second step, design each single blending ratio of planting coking coal, meet: coal blending coke: coarse grain is inlayed component > 33%, inertia component 20-27%, same sex structure component < 6%, coal blending fugitive constituent, at 25-30%, obtains blending ratio, obtains coal blending; The 3rd step, get the bonding index G of coal blending pattern detection coal blending value; The 4th step, make the following choice according to detected result: the bonding index G of coal blending value is between 75-82, and coal blending completes; Or, the bonding index G of coal blending value not between 75-82, circulation second step.The method can rationally be used each single coking coal of planting of special genetic.
Though above-mentioned blending method has certain promoter action to coal-blending coking, but also have the following disadvantages.The one, after will carrying out destructive distillation, die mould or add additive weakly caking coal, type is pressed pre-treatment, has increased facility investment, makes coal blending process become complicated; The consumption to additive and character are not quantitatively described in addition, application difficult; The 2nd, the index request of other coal to participation weakly caking coal coal-blending coking is too harsh; The 3rd, have in the amount of allocating into that ensures can improve under the prerequisite of coke quality weak caking coal material, but the quantitative description of the amount of allocating into not, the amount of allocating into that has quantitative description is 15%, the coke quality of production is poor; The amount of allocating into be 20%-40% need to increase destructive distillation pretreatment process, complex process; The 4th, in Blending of Coal Petrography, do not consider active ingredient and the impact of inert component on process of coking, do not take into full account the directive function of random reflectance of vitrinite distribution histogram to coking, do not relate to the problem of rationally, effectively allocating into low-disintegration coal, weakly caking coal etc. in tamping coking coal blending.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, and a kind of weakly caking coal coal-blending coking method is provided.The method is allocated 25%～45% weakly caking coal, 5%～55% 1/3 coking coal and 10%～25% lean coal into, can ensure the coke strength M that tamping coking is produced
25>=91.0%, M
10≤ 6.5%; Hot index carbon dioxide reaction CRI≤33%, post-reaction strength CSR>=56%, the coke hot index of part blending ratio is better; The method can realize coal blending accurate operation, realizes the vast scale of weakly caking coal and allocates into, has expanded coking coal resource, has improved the quality of coke, significant.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of weakly caking coal coal-blending coking method, it is characterized in that, mixed coal after coal blending comprises weakly caking coal, 1/3 coking coal and lean coal, in coal blending process, the amount of allocating into of weakly caking coal is 25%～45% by mass percentage, the amount of allocating into of 1/3 coking coal is 5%～55% by mass percentage, and the amount of allocating into of lean coal is 10%～25% by mass percentage, and the method for described coal blending comprises the following steps:
Step 1, single pit ash, volatile matter, full sulphur, caking index, plastometer indice, random reflectance of vitrinite Re distribution proportion, the average maximum reflectivity Rmax of vitrinite and macerals of planting for coking detected, calculate work lazy the compare A/I of coking with single kind coal according to macerals;
Step 2, by the average maximum reflectivity Rmax of vitrinite of the random reflectance of vitrinite Re of weakly caking coal distribution proportion, weakly caking coal and the work of weakly caking coal lazy than A/I centered by, in conjunction with other single plant the average maximum reflectivity Rmax of random reflectance of vitrinite Re distribution proportion, vitrinite of coals and live lazyly carry out blending ratio design than A/I; Then carry out coal blending according to the blending ratio of design, measure the average maximum reflectivity Rmax of random reflectance of vitrinite Re distribution proportion, vitrinite, macerals and the standard variance of the mixed coal after coal blending, and it is lazy than A/I to calculate the work of mixed coal according to macerals, draw the random reflectance of vitrinite distribution histogram of mixed coal according to the random reflectance of vitrinite Re distribution proportion of mixed coal; The average maximum reflectivity Rmax of vitrinite that simultaneously meets mixed coal when result is 0.90%～1.40%, standard variance is 0.25～0.36 and to live lazy be 1.8～2.4 than A/I, and the random reflectance of vitrinite Re distribution histogram that meets mixed coal is continuous, carries out step 3;
Step 3, get the sample of mixed coal, ash content, volatile matter, full sulphur, caking index and maximum thickness of plastic layer to sample carry out analytical test, be less than 10.0% when the sample of test meets ash content simultaneously, volatilization is divided into 26.0%～32.0%, full sulphur is below 0.88%, caking index is 58～72 and maximum thickness of plastic layer while being 10mm～15mm, coal blending completes;
Step 4, the mixed coal that coal blending in step 3 is completed pack coking by coke oven into after making firm by ramming.
A kind of above-mentioned weakly caking coal coal-blending coking method, in coal blending process, the amount of allocating into of weakly caking coal is 30%～40% by mass percentage, the amount of allocating into of 1/3 coking coal is 20%～50% by mass percentage, and the amount of allocating into of lean coal is 15%～20% by mass percentage.
A kind of above-mentioned weakly caking coal coal-blending coking method, in coal blending process, the amount of allocating into of weakly caking coal is that the amount of allocating into of 30%, 1/3 coking coal is 50% by mass percentage by mass percentage, the amount of allocating into of lean coal is 20% by mass percentage.
A kind of above-mentioned weakly caking coal coal-blending coking method, before making firm by ramming described in step 4, mixed coal being pulverized to the mixed coal fineness making after pulverizing is 85%～90%.
A kind of above-mentioned weakly caking coal coal-blending coking method, described in step 4, making density firm by ramming is 1.05g/m
3～1.25g/m
3.
In the present invention, work is lazy than A/I is:
Live lazy than A/I=active component content/inert component content;
Active component content=vitrinite+chitin group+1/3 half vitrinite;
Inert component content=silk quality group+2/3 half vitrinites+mineral group.
The X-coordinate of the random reflectance of vitrinite distribution histogram of mixed coal is, using 0.05% as 1 interval, the random reflectance of vitrinite Re distribution range of mixed coal is divided into 42 intervals from 0.4%～2.5%, and ordinate zou is that the random reflectance of vitrinite Re of the mixed coal after mixture is at each interval distribution proportion.
The present invention compared with prior art has the following advantages:
1, the present invention is with coal petrology index random reflectance of vitrinite Re distribution proportion, the average maximum reflectivity Rmax of vitrinite, macerals and the lazy first class index system that is compared to of living; Using coal analysis index ash content, volatile matter, full sulphur, caking index, plastometer indice etc. as two-level index system.When coal blending by the random reflectance of vitrinite Re of weakly caking coal distribution proportion, the average maximum reflectivity Rmax of vitrinite, macerals and live lazy than A/I centered by, participate in coal-blending cokings in conjunction with other single plant the average maximum reflectivity Rmax of random reflectance of vitrinite Re distribution proportion, vitrinite, the macerals of coal and live lazyly carry out blending ratio design than first class index such as A/I, control two-level index simultaneously and coordinate pit ash, volatile matter, full sulphur, caking index and maximum thickness of plastic layer index, realize two index system control.Make that random reflectance of vitrinite Re distribution plan continuous distribution, the average maximum reflectivity Rmax of vitrinite of mixed coal are distributed in 0.90%～1.40%, standard variance between 0.25～0.36, macerals live lazy than A/I between 1.8～2.4 and coordinate pit ash (A
d) be controlled at below 10.0% volatile matter (V
daf) be controlled between 26.0%～32.0% full sulphur (S
t.d) below 0.88%, caking index (G
r.I) be controlled between 58～72, thickness of colloidal matter layer (Y) is controlled between 10mm～15mm.
2, use method of the present invention, allocate 25%～45% weakly caking coal, 10%～55% 1/3 coking coal and 10%～25% lean coal into, can ensure the coke strength M that tamping coking is produced
25>=91.0%, M
10≤ 6.5%; Hot index carbon dioxide reaction CRI≤33%, post-reaction strength CSR>=56%, the coke hot index of part blending ratio is better.
3, blending method of the present invention can be realized coal blending accurate operation, realizes the vast scale of weakly caking coal and allocates into, has expanded coking coal resource, has improved the quality of coke, significant.
Below in conjunction with drawings and Examples, technical scheme of the present invention is described in further detail.
Brief description of the drawings
Fig. 1 is the random reflectance of vitrinite distribution histogram of the mixed coal of the embodiment of the present invention 1.
Fig. 2 is the random reflectance of vitrinite distribution histogram of the mixed coal of the embodiment of the present invention 2.
Fig. 3 is the random reflectance of vitrinite distribution histogram of the mixed coal of the embodiment of the present invention 3.
Fig. 4 is the random reflectance of vitrinite distribution histogram of the mixed coal of the embodiment of the present invention 4.
Fig. 5 is the random reflectance of vitrinite distribution histogram of the mixed coal of the embodiment of the present invention 5.
Fig. 6 is the random reflectance of vitrinite distribution histogram of the mixed coal of the embodiment of the present invention 6.
Fig. 7 is the random reflectance of vitrinite distribution histogram of the mixed coal of the embodiment of the present invention 7.
Fig. 8 is the random reflectance of vitrinite distribution histogram of the mixed coal of the embodiment of the present invention 8.
Embodiment
In following examples, work is lazy than A/I is:
Live lazy than A/I=active component content/inert component content;
Active component content=vitrinite+chitin group+1/3 half vitrinite;
Inert component content=silk quality group+2/3 half vitrinites+mineral group.
The X-coordinate of the random reflectance of vitrinite distribution histogram of mixed coal is, using 0.05% as 1 interval, the random reflectance of vitrinite Re distribution range of mixed coal is divided into 42 intervals from 0.4%～2.5%, and ordinate zou is that the random reflectance of vitrinite Re of the mixed coal after mixture is at each interval distribution proportion.
Embodiment 1
Step 1, according to national standard, to meeting coking plant raw material mix and ature of coal conditional request 9 kinds single ash content (A that plant coals (1# coal～9# coal)
d), volatile matter (V
daf), full sulphur (S
t,d), caking index (G
r.I) and plastometer indice detect, the results are shown in Table 1;
The single coal coal analysis result of planting of table 1
The 9 kinds of single average maximum reflectivity Rmax of random reflectance of vitrinite Re distribution proportion, vitrinite and maceralss of planting coal (1# coal～9# coal) are detected, and lazy than A/I according to the work of the single kind of macerals calculating coal, detection and calculation result (except random reflectance of vitrinite Re distribution proportion) are shown in Table 2;
The single coal coal petrography property analysis result of planting of table 2
| Single coal of planting | Rmax/％ | V/％ | E/％ | I/％ | SV/％ | SI/％ | M/％ | A/I |
| 1# coal | 0.892 | 52.3 | 1.7 | 33.8 | 4.2 | 0 | 8 | 1.24 |
| 2# coal | 0.82 | 53.4 | 3.5 | 34.9 | 4.9 | 0 | 3.2 | 1.41 |
| 3# coal | 0.899 | 54.1 | 5.9 | 35.3 | 2.6 | 0 | 2.2 | 1.56 |
| 4# coal | 1.22 | 66.1 | 3.9 | 26.3 | 1.5 | 0 | 2.2 | 2.39 |
| 5# coal | 1.207 | 62.9 | 3 | 27.3 | 3.2 | 0 | 3.7 | 2.03 |
| 6# coal | 1.34 | 58.2 | 3.6 | 33.1 | 1.8 | 0 | 3.4 | 1.66 |
| 7# coal | 1.611 | 63.1 | 4.2 | 28.7 | 2.3 | 0 | 1.7 | 2.13 |
| 8# coal | 1.998 | 66.5 | 2.1 | 25.1 | 4.4 | 0 | 1.8 | 2.34 |
| 9# coal | 2.05 | 75.6 | 2.3 | 18.0 | 3.4 | 0 | 0.6 | 3.77 |
Step 2, by the average maximum reflectivity Rmax of vitrinite of the random reflectance of vitrinite Re of weakly caking coal distribution proportion, weakly caking coal and the work of weakly caking coal lazy than A/I centered by (amount of allocating into of weakly caking coal is set to 25%～45%), in conjunction with other single plant the average maximum reflectivity Rmax of random reflectance of vitrinite Re distribution proportion, vitrinite of coals and live lazyly carry out blending ratio design than A/I; Design is in table 3;
The design of table 3 mixed coal blending ratio
| ? | 1# coal | 4# coal | 5# coal | 8# coal |
| The amount of allocating into (wt%) | 25 | 55 | 5 | 15 |
The blending ratio designing according to table 3 is carried out coal blending, adopt coal petrography analytical system (as U.S. CRAIC QDI 302 microphotometers or HD type full microscope photometer etc.) to measure the average maximum reflectivity Rmax of random reflectance of vitrinite Re distribution proportion, vitrinite, macerals and the standard variance of the mixed coal after coal blending, and lazy than A/I according to the work of macerals calculating mixed coal, draw mixed coal random reflectance of vitrinite distribution histogram (seeing Fig. 1) according to the random reflectance of vitrinite Re distribution proportion of mixed coal;
The work of table 4 mixed coal is lazy than A/I, the average maximum reflectivity Rmax of vitrinite and standard variance
| ? | The lazy A/I that compares lives | Rmax/％ | Standard variance S |
| Mixed coal | 1.93 | 1.146 | 0.301 |
As shown in Table 4, the work of mixed coal lazy than A/I meet 1.8～2.4, the average maximum reflectivity Rmax of vitrinite meet 0.90%～1.40%, standard variance meet 0.25～0.36, as shown in Figure 1, random reflectance of vitrinite Re distribution histogram continuous distribution;
Step 3, get the sample of mixed coal, ash content, volatile matter, full sulphur, caking index and maximum thickness of plastic layer to sample carry out analytical test, and measured result is shown in Table 5;
Table 5 mixed coal technological property table
| ? | A d/％ | V daf/％ | S t,d/％ | G R.I | Y/mm |
| Mixed coal | 9.54 | 28.58 | 0.78 | 65 | 13.38 |
As shown in Table 5, coordinate the measurement result of pit ash, volatile matter, full sulphur, caking index and maximum thickness of plastic layer to meet ash content (A
d) be less than 10.0%, volatile matter (V
daf) be 26.0%～32.0%, full sulphur (S
t.d) be less than 0.88%, caking index (G
r.I) be 58～72, maximum thickness of plastic layer (Y) is 10mm～15mm, coal blending completes;
Step 4, the mixed coal that coal blending in step 3 is completed are pulverized, the mixed coal fineness (mixed coal fineness refers to that particle in coal charge is less than the shared per-cent of part of 3mm) of controlling after pulverizing is 85%～90%, then after the mixed coal after pulverizing being made firm by ramming, pack coking by coke oven into, making density firm by ramming is 1.15g/m
3, the quality index of the coke obtaining is in table 6.
The quality index of table 6 coke
| ? | A d/％ | V daf/％ | S t,d/％ | M 25/％ | M 10/％ | CRI/％ | CSR/％ |
| Coke | 12.4 | 1.3 | 0.78 | 91.2 | 6.3 | 27 | 65 |
Embodiment 2-embodiment 8 is described according to following content:
9 kinds of single coals of planting that adopt embodiment 1, carry out coal-blending coking according to the method for embodiment 1, and blending ratio design is in table 7;
The mixed coal blending ratio design of table 7 embodiment 2-embodiment 8
| Embodiment | 1# coal | 2# coal | 3# coal | 4# coal | 5# coal | 6# coal | 7# coal | 8# coal | 9# coal |
| 2 | 27％ | 10％ | 5％ | 15％ | 19％ | 8％ | ? | 16％ | ? |
| 3 | 30％ | 7％ | 5％ | 10％ | 18％ | 10％ | ? | 20％ | ? |
| 4 | 30％ | ? | ? | 50％ | ? | ? | ? | 20％ | ? |
| 5 | 35％ | ? | 7％ | 13％ | 18％ | 7％ | 7％ | 10％ | 3％ |
| 6 | 45％ | ? | ? | 20％ | 10％ | ? | ? | 25％ | ? |
| 7 | 40％ | ? | ? | 20％ | 20％ | ? | ? | 15％ | 5％ |
| 8 | 30％ | 7％ | ? | 5％ | 30％ | ? | 15％ | 13％ | ? |
The blending ratio designing according to table 7 is carried out coal blending, measure the average maximum reflectivity Rmax of random reflectance of vitrinite Re distribution proportion, vitrinite, macerals and the standard variance of the mixed coal after coal blending, and lazy than A/I according to the work of macerals calculating mixed coal, draw mixed coal random reflectance of vitrinite distribution histogram (seeing Fig. 2-Fig. 8) according to the random reflectance of vitrinite Re distribution proportion of mixed coal;
The work of table 8 mixed coal is lazy than A/I, the average maximum reflectivity Rmax of vitrinite and standard variance
| Embodiment | The lazy A/I that compares lives | Rmax/％ | Standard variance S |
| 2 | 1.81 | 1.159 | 0.335 |
| 3 | 1.78 | 1.322 | 0.504 |
| 4 | 2.035 | 1.225 | 0.352 |
| 5 | 1.83 | 1.155 | 0.301 |
| 6 | 1.89 | 1.123 | 0.296 |
| 7 | 1.89 | 1.149 | 0.306 |
| 8 | 1.82 | 1.29 | 0.341 |
As shown in Table 8, the work of the mixed coal of embodiment 2, embodiment 4, embodiment 5, embodiment 6, embodiment 7 and embodiment 8 lazy than A/I meet 1.8～2.4, the average maximum reflectivity Rmax of vitrinite meets 0.9%～1.40%, standard variance meets 0.25～0.36, shown in Fig. 2, Fig. 4-Fig. 8, random reflectance of vitrinite Re distribution histogram continuous distribution; Do not meet 1.8～2.4 and the work of the mixed coal of embodiment 3 is lazy than A/I, standard variance does not meet 0.25～0.36, and as seen from Figure 3, the random reflectance of vitrinite Re distribution histogram of embodiment 3 distributes discontinuous, therefore deletes the Coal Blending Schemes of embodiment 3 mixed coals;
The sample of the mixed coal to embodiment 2, embodiment 4, embodiment 5, embodiment 6, embodiment 7 and embodiment 8 carries out analytical test, the results are shown in Table 9;
Table 9 mixed coal technological property table
| Embodiment | A d/％ | V daf/％ | S t,d/％ | G R.I | Y/mm |
| 2 | 9.32 | 28.14 | 0.74 | 63 | 13.02 |
| 4 | 9.80 | 27.09 | 0.59 | 62 | 12.7 |
| 5 | 9.20 | 28.04 | 0.72 | 60 | 12.75 |
| 6 | 9.49 | 28.44 | 0.71 | 61 | 13.38 |
| 7 | 9.42 | 28.44 | 0.68 | 58 | 12.33 |
| 8 | 9.55 | 27.79 | 0.77 | 62 | 13.23 |
As shown in Table 9, the measurement result of the cooperation pit ash of embodiment 2, embodiment 4, embodiment 5, embodiment 6, embodiment 7 and embodiment 8, volatile matter, full sulphur, caking index and maximum thickness of plastic layer meets ash content (A
d) be less than 10.0%, volatile matter (V
daf) be 26.0%～32.0%, full sulphur (S
t.d) be less than 0.88%, caking index (G
r.I) be 58～72, maximum thickness of plastic layer (Y) is 10mm～15mm, coal blending completes;
The mixed coal that coal blending is completed is pulverized, the mixed coal fineness (mixed coal fineness refers to that particle in coal charge is less than the shared per-cent of part of 3mm) of controlling after pulverizing is 85%～90%, then after the mixed coal after pulverizing being made firm by ramming, pack coking by coke oven into, making density firm by ramming is 1.05g/m
3～1.25g/m
3, the quality index of the coke obtaining is in table 10.
The quality index of table 10 coke
| Embodiment | A d/％ | V daf/％ | S t,d/％ | M 25/％ | M 10/％ | CRI/％ | CSR/％ |
| 2 | 12.5 | 1.1 | 0.75 | 91.2 | 6.4 | 31 | 65 |
| 4 | 12.6 | 1.2 | 0.64 | 93.3 | 4.9 | 26 | 68 |
| 5 | 12.5 | 1.5 | 0.74 | 91.4 | 6.5 | 33 | 56 |
| 6 | 12.7 | 1.2 | 0.74 | 91.7 | 6.3 | 33 | 56 |
| 7 | 12.6 | 1.1 | 0.78 | 92.3 | 5.6 | 29 | 61 |
| 8 | 12.5 | 1.1 | 0.74 | 91.0 | 6.3 | 33 | 56 |
The present invention is with coal petrology index random reflectance of vitrinite Re distribution proportion, the average maximum reflectivity Rmax of vitrinite, macerals and the lazy first class index system that is compared to of living; Using coal analysis index ash content, volatile matter, full sulphur, caking index, plastometer indice etc. as two-level index system.When coal blending by the random reflectance of vitrinite Re of weakly caking coal distribution proportion, the average maximum reflectivity Rmax of vitrinite, macerals and live lazy than A/I centered by, participate in coal-blending cokings in conjunction with other single plant the average maximum reflectivity Rmax of random reflectance of vitrinite Re distribution proportion, vitrinite, the macerals of coal and live lazyly carry out blending ratio design than first class index such as A/I, control two-level index simultaneously and coordinate pit ash, volatile matter, full sulphur, caking index and maximum thickness of plastic layer index, realize two index system control.Make that random reflectance of vitrinite Re distribution plan continuous distribution, the average maximum reflectivity Rmax of vitrinite of mixed coal are distributed in 0.90%～1.40%, standard variance between 0.25～0.36, macerals live lazy than A/I between 1.8～2.4 and coordinate pit ash (A
d) be controlled at below 10.0% volatile matter (V
daf) be controlled between 26.0%～32.0% full sulphur (S
t.d) below 0.88%, caking index (G
r.I) be controlled between 58～72, thickness of colloidal matter layer (Y) is controlled between 10mm～15mm.Use method of the present invention, allocate 25%～45% weakly caking coal, 10%～55% 1/3 coking coal and 10%～25% lean coal into, can ensure the coke strength M that tamping coking is produced
25>=91.0%, M
10≤ 6.5%; Hot index carbon dioxide reaction CRI≤33%, post-reaction strength CSR>=56%, the coke hot index of part blending ratio is better.
Blending method of the present invention can be realized coal blending accurate operation, realizes the vast scale of weakly caking coal and allocates into, has expanded coking coal resource, has improved the quality of coke, significant.
The above; it is only preferred embodiment of the present invention; not the present invention is done to any restriction, every any simple modification of above embodiment being done according to invention technical spirit, change and equivalent structure change, and all still belong in the protection domain of technical solution of the present invention.
Claims (3)
1. a weakly caking coal coal-blending coking method, it is characterized in that, mixed coal after coal blending comprises weakly caking coal, 1/3 coking coal and lean coal, in coal blending process, the amount of allocating into of weakly caking coal is 30% by mass percentage, the amount of allocating into of 1/3 coking coal is 50% by mass percentage, the amount of allocating into of lean coal is 20% by mass percentage, and the method for described coal blending comprises the following steps:
Step 1, single pit ash, volatile matter, full sulphur, caking index, plastometer indice, random reflectance of vitrinite Re distribution proportion, the average maximum reflectivity Rmax of vitrinite and macerals of planting for coking detected, calculate work lazy the compare A/I of coking with single kind coal according to macerals;
Step 2, by the average maximum reflectivity Rmax of vitrinite of the random reflectance of vitrinite Re of weakly caking coal distribution proportion, weakly caking coal and the work of weakly caking coal lazy than A/I centered by, in conjunction with other single plant the average maximum reflectivity Rmax of random reflectance of vitrinite Re distribution proportion, vitrinite of coals and live lazyly carry out blending ratio design than A/I; Then carry out coal blending according to the blending ratio of design, measure the average maximum reflectivity Rmax of random reflectance of vitrinite Re distribution proportion, vitrinite, macerals and the standard variance of the mixed coal after coal blending, and it is lazy than A/I to calculate the work of mixed coal according to macerals, draw the random reflectance of vitrinite distribution histogram of mixed coal according to the random reflectance of vitrinite Re distribution proportion of mixed coal; The average maximum reflectivity Rmax of vitrinite that simultaneously meets mixed coal when result is 0.90%～1.40%, standard variance is 0.25～0.36 and to live lazy be 1.8～2.4 than A/I, and the random reflectance of vitrinite Re distribution histogram that meets mixed coal is continuous, carries out step 3;
Step 3, get the sample of mixed coal, ash content, volatile matter, full sulphur, caking index and maximum thickness of plastic layer to sample carry out analytical test, be less than 10.0% when the sample of test meets ash content simultaneously, volatilization is divided into 26.0%～32.0%, full sulphur is below 0.88%, caking index is 58～72 and maximum thickness of plastic layer while being 10mm～15mm, coal blending completes;
Step 4, the mixed coal that coal blending in step 3 is completed pack coking by coke oven into after making firm by ramming;
Described work is lazy than A/I is:
Live lazy than A/I=active component content/inert component content;
Active component content=vitrinite+chitin group+1/3 half vitrinite;
Inert component content=silk quality group+2/3 half vitrinites+mineral group;
The X-coordinate of the random reflectance of vitrinite distribution histogram of mixed coal is, using 0.05% as 1 interval, the random reflectance of vitrinite Re distribution range of mixed coal is divided into 42 intervals from 0.4%～2.5%, and ordinate zou is that the random reflectance of vitrinite Re of the mixed coal after mixture is at each interval distribution proportion.
2. a kind of weakly caking coal coal-blending coking method according to claim 1, is characterized in that, before making firm by ramming described in step 4, mixed coal being pulverized to the mixed coal fineness making after pulverizing is 85%～90%.
3. a kind of weakly caking coal coal-blending coking method according to claim 1, is characterized in that, described in step 4, making density firm by ramming is 1.05g/m
3～1.25g/m
3.
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| CN109233882B (en) * | 2018-10-31 | 2020-09-04 | 中国矿业大学 | Method for regulating and controlling melting point of gasified coke ash prepared from high-proportion low-quality coal |
| CN113484282B (en) * | 2021-07-02 | 2023-04-28 | 西安建筑科技大学 | Identification method for poor lean coal, lean coal or anthracite doped in semi-coke powder |
| CN113684048B (en) * | 2021-08-19 | 2022-10-21 | 首钢集团有限公司 | Coking coal blending method, coal blending system and industrial control equipment |
| CN114544907B (en) * | 2022-01-14 | 2023-07-18 | 淮北矿业股份有限公司 | Mixed coking coal identification evaluation method based on Kirschner fluidity characteristic index |
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