CN111548810A - Coke and preparation method and application thereof - Google Patents
Coke and preparation method and application thereof Download PDFInfo
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- CN111548810A CN111548810A CN202010481967.1A CN202010481967A CN111548810A CN 111548810 A CN111548810 A CN 111548810A CN 202010481967 A CN202010481967 A CN 202010481967A CN 111548810 A CN111548810 A CN 111548810A
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- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
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Abstract
The invention relates to the field of coal chemical industry and discloses coke and a preparation method thereof. The preparation method of the coke comprises the following steps: (1) preparing raw materials to obtain blended coal, wherein the raw materials comprise the following components in percentage by weight based on the total weight of the raw materials: 80-96 wt% of low-volatile coal, 2-5 wt% of binder and 2-15 wt% of reducing agent, wherein the caking index G of the low-volatile coal isIs low inG is more than or equal to 20Is low in< 90; (2) the blended coal is made into coal cakes and then put into a heat recovery coke oven for coking; wherein the final temperature of the radiation section of the heat recovery coke oven is 900-. The invention adopts the low-volatile coal with medium and low caking property as the coking raw material, produces the coke with large lumpiness and small ash content, and reduces the use proportion of high-quality coal and the preparation cost of the coke.
Description
Technical Field
The invention relates to the field of coal chemical industry, in particular to coke and a preparation method thereof.
Background
The low ash and large lump special coke is ash content (A)d) Coke with a particle size not less than 80mm and not more than 8 wt% and is mainly used for cokeCasting, rock wool and other industries. The low ash and large coke are mainly special fuels for cupola furnace iron melting, basalt and dolomite melting, and have the functions of providing heat, carburizing, slagging and bed layer supporting.
The quality (such as ash content, lumpiness, uniformity, strength, reactivity and porosity) of low-ash and large-lump special coke directly influences the quality of the cupola iron liquid and the rock wool. A large number of researches show that the temperature of molten iron can be increased by 10 ℃ when the ash content of coke is reduced by 1%, the stability of the ash content of the coke is favorable for controlling the temperature and carburetion of the molten iron, and the standards of domestic and foreign foundry coke all have the basis of dividing the grade of the foundry coke by the ash content; the larger the lumpiness of the coke is, the higher the combustion efficiency is, and the smelting temperature of the molten iron and rock slurry is high; the uniformity of the lump size of the coke is beneficial to improving the melting rate of iron and rock; the strength of the coke is improved, the damage of the coke in the transfer process can be reduced, the lumpiness and uniformity of the coke can be kept, and the smelting temperature of the iron liquid and rock slurry and the thermal efficiency of a smelting furnace are improved; the coke with low reactivity and porosity is beneficial to improving the thermal efficiency of the cupola furnace and the temperature of the iron liquid and rock slurry.
Along with the upgrade of manufacturing industry at home and abroad, the requirements of relative materials such as castings, rock wool and the like at home and abroad are further increased, so that the demand of low-ash and large-block coke is increased. However, the production of low-ash and large-block coke at present needs to mix raw materials such as high-quality coking coal and fat coal resources in a large proportion, the requirement on the caking property of the raw materials is high, the caking index G is generally more than 80, but the supply of the resources in China is relatively short, the coal blending cost is invisibly increased, and the continuous development of the large-block special coke industry is not facilitated.
Disclosure of Invention
The invention provides coke, a preparation method and application thereof, aiming at realizing the production of large-block special coke by using low-caking-index coal. The coke with large granularity, less ash content, high crushing strength and low apparent porosity can be prepared by using the coal with low caking index.
In order to achieve the above object, a first aspect of the present invention provides a method for producing coke, comprising:
(1) preparing raw materials to obtain blended coal; wherein, the followingThe total weight of the raw materials is taken as a reference, and the raw materials comprise: 80-96 wt% of low-volatile coal, 2-5 wt% of binder and 2-15 wt% of reducing agent, wherein the caking index G of the low-volatile coal isIs low inG is more than or equal to 20Is low in＜90；
(2) The blended coal is made into coal cakes and then put into a heat recovery coke oven for coking;
wherein the final temperature of the radiation section of the heat recovery coke oven is 900-.
In a second aspect, the present invention provides a coke produced by the production method of the present invention.
The third aspect of the invention provides an application of the coke in cupola furnace iron melting and blast furnace smelting.
According to the technical scheme, the medium and low-caking performance coal is adopted as a main raw material, a small amount of caking agent and thinning agent are matched for coking in the heat recovery coke oven, the temperature rise speed is low in the coking process, the coking temperature is low, on one hand, colloid among coal particles is completely melted when a coal cake is carbonized, and a sufficient amount of colloid is generated, so that the obtained coke is ensured to have larger lumpiness; on the other hand, the peak values of two peaks with larger shrinkage degree in the coal coking process are reduced, the temperature gradient of the coal cake from the furnace wall to the center is reduced, so that the stress difference of adjacent coal and coke layers is reduced, cracks generated in the coke preparation process are reduced, and the obtained coke has large lumpiness (the granularity of more than 50 wt% of the coke is more than 80mm) and high strength (M)40≥90％，M10Less than or equal to 8 percent).
The invention adopts the medium and low caking property coal as the coking raw material, thus reducing the use proportion of high-quality coal and the preparation cost of coke.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In a first aspect, the present invention provides a method for producing coke, comprising:
(1) preparing raw materials to obtain blended coal, wherein the raw materials comprise the following components in percentage by weight based on the total weight of the raw materials: 80-96 wt% of low-volatile coal, 2-5 wt% of binder and 2-15 wt% of reducing agent, wherein the caking index G of the low-volatile coal is lower than or equal to 20 and is less than or equal to GIs low in＜90；
(2) The blended coal is made into coal cakes and then put into a heat recovery coke oven for coking;
wherein the final temperature of the radiation section of the heat recovery coke oven is 900-.
According to the invention, the low-volatile coal with medium and low caking property is used as a main raw material, a small amount of binder and thinning agent are matched for coking in the heat recovery coke oven, the temperature rise speed is low in the coking process, and the coking temperature is low, so that on one hand, colloid among coal particles is completely melted during coal cake carbonization, and a sufficient amount of colloid is generated, thereby ensuring that the obtained coke has large lumpiness; on the other hand, the peak values of two large shrinkage degree peaks in the coal coking process are reduced, the temperature gradient of the coal cake from the furnace wall to the center is reduced, so that the stress difference of adjacent coal and coke layers is reduced, cracks generated in the coke preparation process are reduced, and the coke with large lumpiness (the granularity of more than 50 wt% of the coke is more than 80mm) and high strength (M40 is more than or equal to 90 wt%, M10 is less than or equal to 8 wt%) is obtained. And the low-volatile coal with medium and low caking property is used as a coking raw material, so that the use ratio of high-quality coal is saved, and the preparation cost of coke is reduced.
In the invention, G is more than or equal to 20Is low inThe low-volatile coal less than 90 can only meet self-caking in coal blending or can only be used as an inert component in coking, and the colloid body generated by single coking is less (Y: 6mm-16mm), so that a small amount of binder and a thinning agent need to be blended in the coking. The adhesive can not only improve the adhesive property of the blended coal, but also promote the development of anisotropic structures in the optical structure of the coke; preferably, the binder is pitch, more preferably, the binder is selected from high temperature coal tarAt least one of pitch, medium-low temperature coal tar pitch, modified pitch, hard pitch, petroleum pitch, coal extraction residue pitch, and the like; further preferably, the binder content of the feedstock is 2 wt% to 5 wt% (e.g., may be 2 wt%, 3 wt%, 4 wt%, 5 wt%, or any value therebetween).
In the invention, the thinning agent belongs to inert components in the coal blending, and can improve the lumpiness of the coke; in order to reduce the ash content of the coke, preferably, the thinning agent is a low ash content thinning agent; further preferably, the thinning agent is selected from at least one of lean coal, anthracite, coke breeze, petroleum coke, and pitch coke, and more preferably petroleum coke. The amount of the leaner is also an important factor affecting coke performance, and preferably the amount of leaner in the feed is between 2 wt% and 15 wt% (e.g., may be 2 wt%, 3 wt%, 5 wt%, 8 wt%, 10 wt%, 15 wt%, or any value therebetween).
In the present invention, in order to improve the quality of the coke and reduce the ash content of the coke, it is preferable that the ash content a of the low volatile coal isd, lowLess than or equal to 8wt percent; further preferably, the volatile matter V of the low volatile matter coaldaf lowV is more than or equal to 14 weight percentdaf low< 25 wt.% (e.g., can be 14 wt.%, 15 wt.%, 16 wt.%, 17 wt.%, 18 wt.%, 20 wt.%, 25 wt.%, or any value therebetween), more preferably 16 wt.% Vdaf low＜18wt％。
In the invention, in order to improve the granularity of coke and reduce the use proportion of high-quality coal, the low-volatile coal comprises at least one of a plurality of coals with different caking indexes under the preferable conditions; further preferably, the low volatile coal comprises: bonding index GASatisfy 80 < GA90A coal (e.g., 80, 82, 84, 86, 90 or any value therebetween), a caking index GBSatisfy 65 < GB80B coal (e.g., 65, 70, 75, 80 or any value therebetween) and a caking index GcG is not less than 50CC coal of 65 or less (e.g., can be 50, 55, 58, 60, 65, or any value therebetween); more preferably, the caking of the coal A in the low-volatile coal packet refers toNumber GAIs the caking index G of 84, B coalBIs the caking index G of 74, C coalCIs 58. The low volatile coal consists of relatively high-content low-quality coal (coal B and coal C) and a small amount of high-quality coal (coal A), although the caking indexes of the coal B and the coal C are relatively low, the coal particles can be completely melted when the coal B and the coal C are melted and carbonized with the coal A, a caking agent and a thinning agent at a relatively low temperature rise speed, and sufficient colloid is generated, so that the granularity and the quality of coke are ensured.
In the present invention, in order to further increase the particle size of the coke, it is preferable that the low volatile coal contains, based on the total weight of the raw material: 30-40 wt% of coal A, 15-20 wt% of coal B and 35-45 wt% of coal C; most preferably 35 wt% of coal A, 17 wt% of coal B and 40 wt% of coal C.
In the present invention, in order to reduce the ash content of coke, it is preferable that the ash content A of coal A is reduceddA5-6.1 wt%, volatile component Vdaf,A16-19 wt%, more preferably, the coal A is ash AdA6.02 wt%, volatile component Vdaf,A17.45 wt%; ash content A of said B coaldB8-9 wt%, volatile component Vdaf,B16 to 17 wt%, more preferably, ash A of said B coaldB8.12 wt%, volatile component Vdaf,B16.87 wt%; ash content A of said C coaldC7-8 wt%, volatile component Vdaf,C16 to 17 wt%, more preferably, ash A of said C coaldC7.41 wt%, volatile component Vdaf,CIt was 16.49 wt%.
In the present invention, in order to further improve the coal quality of the coke, to improve the strength (CSR) after the coke reaction, and to reduce the reactivity (CRI) and apparent porosity (Ps) of the coke, it is preferable that the sulfur content S of the coal a is higher than that of the coal at,d,A0.5-0.6 wt%, XAIs 15-20.0mm, YA9-11.0mm, V/IAIs 0.8-1, MCIA1.85-2%; sulfur content S of said B coalt,d,B0.3-0.4 wt%, XBIs 19-21mm, YBIs 6-8mm, V/IB0.5-0.6, MCIB1.1-1.2%; sulfur content S of the C coalt,d,C0.4-0.5 wt%, XCIs 17-19mm, YCIs 6-7mm, V/IC0.4-0.5, MCIC1-2%; more preferably, the coal A contains S as sulfur componentt,d,A0.52 wt%, XAIs 17mm and YAIs 10mm, V/IAIs 0.98, MCIA1.95 percent; sulfur content S of said B coalt,d,B0.38 wt%, XB20.5mm, YBIs 7mm, V/IBIs 0.58, MCIB1.18 percent; sulfur content S of the C coalt,d,C0.41 wt%, XCIs 18mm and YC6.5mm, V/ICIs 0.46, MCICIt was 1.15%.
In the present invention, in order to uniformly disperse the raw materials, it is preferable that coal a, coal B and coal C are pulverized before blending, and after pulverization, 88 to 98 wt% of the coal a has an average particle size of less than 3 mm; 88-98 wt% of said B coal having an average particle size < 3 mm; 88-98 wt% of the C coal has an average particle size of < 3 mm.
In order to make the dispersion between the raw materials more uniform and to increase the particle size of the coke, it is preferable that the process of formulating in step (1) comprises: mixing and crushing a thinning agent, a binder and one of a plurality of coals with different caking indexes contained in the low-volatile coal to obtain crushed materials; respectively crushing other coals in the low-volatile coal with different caking indexes into crushed coals; and mixing the crushed materials with the crushed coal and adjusting the moisture content to obtain the blended coal.
In one embodiment of the present invention, a thinning agent, a binder and coal A may be mixed and pulverized to obtain pulverized material, wherein 88-98 wt% of the pulverized material has an average particle size of < 3 mm; and mixing the crushed material with the coal B and the coal C which are crushed in the same way to obtain the blended coal.
In another embodiment of the present invention, the leaner, the binder and the coal B may be mixed and pulverized to obtain pulverized material, wherein 88-98 wt% of the pulverized material has an average particle size of < 3 mm; then, the pulverized material was mixed with the coal a and the coal C pulverized in the same manner to obtain blended coal.
In another embodiment of the present invention, the leaner, the binder and the coal C may be mixed and pulverized to obtain pulverized material, wherein 88-98 wt% of the pulverized material has an average particle size of < 3 mm; then, the pulverized material was mixed with the coal a and the coal B pulverized in the same manner to obtain blended coal.
In the present invention, in order to further improve the properties of the coke, the particle size and strength (CSR) of the coke after the reaction are increased, and the ash content (A) of the coke is reducedd) Reactivity (CRI) and apparent porosity (Ps), and the blended coal simultaneously meets the following performance indexes: a. thed, preparing≤6.5wt％；15wt％≤Vdaf, preparation of≤20wt％；55≤GFitting for mixing≤70；8mm≤YFitting for mixing≤15mm；15mm≤XFitting for mixing≤30mm；0.7≤V/IFitting for mixingLess than or equal to 1.0 and MCIFitting for mixing≤3.0wt％。
In the invention, the spacing between coal particles in the coal cake can be reduced by pressing the blended coal into the coal cake, so that the coal cake is effectively melted during carbonization to generate enough colloid, and in the step (2), the density of the coal cake is 0.9t/m3-1.2t/m3(for example, it may be 0.9t/m3、0.95t/m3、1t/m3、1.2t/m3Or any value therebetween). The size of the blended coal can be reduced to further reduce the inter-particle spacing of the coal in the coal cake, and preferably, in the step (1), 88-98 wt% of the blended coal has an average particle size of less than 3mm based on the total weight of the blended coal.
In the present invention, it is preferable that the moisture content of the blended coal is 9 to 15 wt% based on the total weight of the blended coal.
In the invention, coking is carried out at a lower temperature rise rate and a lower coking temperature, so that colloid among coal particles can be completely melted when the coal cake is carbonized, and a sufficient amount of colloid is generated; the method can also reduce the peak values of two peaks with larger shrinkage degree in the coal coking process, and reduce the temperature gradient of the coal cake from the furnace wall to the center, thereby reducing the stress difference between adjacent coal and coke layers, and reducing cracks generated in the coke preparation process, thereby improving the lumpiness and strength of the coke, and preferably, the method for preparing the coke further comprises the following steps: the charging temperature of the briquette is 700 to 850 ℃ (for example, 700 ℃, 750 ℃, 800 ℃, 850 ℃ or any value therebetween), and more preferably 800 ℃.
In the invention, the coal cake is put into a heat recovery coke oven to form coke after drying, desorption, polycondensation, shrinkage and other stages, and preferably, the temperature rising program of the convection section is as follows: raising the temperature from the charging temperature of the coal cake to 900-; temperature rise procedure of the radiation section: the temperature is raised from the charging temperature of the coal cake to 940 ℃ plus 1000 ℃ at the speed of 3-6 ℃/h (for example, 3 ℃/h, 4 ℃/h, 5 ℃/h, 6 ℃/h or any value between the above values).
In the present invention, in order to further increase the caking volume and strength of the coke, the coking time is preferably 7 to 14 days (for example, 7 days, 8 days, 9 days, 10 days, 12 days, 14 days or any value therebetween), and more preferably, the coking time is 9 days. In the coking process, the final temperature of the radiation section of the heat recovery furnace is 900 ℃ to 960 ℃ (for example, 900 ℃, 920 ℃, 940 ℃, 950 ℃, 960 ℃ or any value between the above values), the final temperature of the convection section is 940 ℃ to 1000 ℃ (for example, 940 ℃, 950 ℃, 960 ℃, 980 ℃, 1000 ℃ or any value between the above values), and more preferably, the final temperature of the radiation section of the heat recovery furnace is 900 ℃ and the final temperature of the convection section is 950 ℃.
The invention also provides the coke prepared by the preparation method. Preferably, the performance indexes of the coke are as follows: more than 50 wt% of the coke has a particle size > 80 mm; a. thed, carbon≤8wt％；M40, carbon≥90wt％；M10, carbon≤8wt％；CRICarbon (C)≤25wt％；CSRCarbon (C)≥65wt％；PsCarbon (C)Less than or equal to 38 percent. More preferably, greater than 62.45 wt% of the coke has a particle size of > 80 mm.
The coke prepared by the method has low ash content and large lumpiness, the temperature after combustion is up to 2400 ℃ or above, and the method is particularly suitable for cupola furnace iron melting or blast furnace smelting as foundry coke.
The present invention will be described in detail below by way of examples.
In the following examples, the kinds and properties of the raw materials are shown in table 1.
In the following examples, coal a, coal B, coal C, pitch and petroleum coke were pulverized before blending, and the particle size of pulverized coal a was: the average particle size of 88-98 wt% of coal A is less than 3 mm; the granularity of the crushed coal B is as follows: the average particle size of 88-98 wt% of B coal is less than 3 mm; the particle size of the crushed coal C is as follows: the average particle size of 88-98 wt% C coal is less than 3 mm; the particle size of the crushed asphalt is as follows: the average particle size of 88-98 wt% C coal is less than 3 mm; the granularity of the crushed petroleum coke is as follows: the average particle size of 88-98 wt% C coal is less than 3 mm.
The particle size of the coke is measured by GB/T4511.2-1999 method for measuring the falling strength of the coke; ash content (A) of coked) Measured by GB/T2001-2013 coke industry analysis and determination method; sulfur (S)t,d) Measured by GB/T2286-2017 method for measuring total sulfur content of coke; crushing Strength (M) of Coke40) Abrasion resistance (M)10) Measured by GB/T2006-2008 'determination method of mechanical strength of coke'; the Coke Reactivity (CRI) and the strength after reaction (CSR) are measured by GB/T4000-1996 test methods for coke reactivity and strength after reaction; apparent porosity (Ps) was measured by the method of GB/T4511.1-2008 "method for measuring true relative density, pseudo relative density and porosity of Coke".
TABLE 1 Primary Properties of the raw materials
Example 1
The composition of the raw material for producing coke in this example is shown in Table 2; the preparation method of the coke comprises the following steps:
(1) mixing asphalt, petroleum coke and coal A in proportion and crushing to obtain crushed materials, uniformly mixing 95 wt% of the crushed materials with B coal and C coal (the average particle size of 95 wt% is less than 3mm) which are crushed in the same way by taking the total weight of the crushed materials as a reference, and crushing to obtain blended coal, wherein 90 wt% of the blended coal is less than 3mm by taking the total weight of the blended coal as a reference, the water content of the blended coal is 10 wt%, and other performance indexes of the blended coal are shown in Table 3;
(2) tamping the blended coal 4 times to obtain briquette with specification of 13m × 3.5.5 m × 1m (length × width × height), and density of the briquette after tamping is 0.92t/m3；
(3) The coal cake is put into a heat recovery coke oven (the charging temperature is 800 ℃), then the radiation section is heated to 900 ℃ and the convection section is heated to 950 ℃ at the heating rate of 3 ℃/h, and coking is carried out for 9 days at the final temperature of 900 ℃ in the radiation section and 950 ℃ in the convection section.
The coke obtained in this example had the properties shown in Table 4.
Examples 2 to 5
The compositions of the raw materials for producing coke in examples 2 to 5 are shown in Table 2, and the performance indexes of the blended coals prepared from the raw materials are shown in Table 3.
The coke was prepared as in example 1.
The coke properties obtained in examples 2 to 5 are shown in Table 4.
Example 6
The composition of the raw materials for preparing the coke is the same as that of the raw materials for preparing the coke in example 1, except that the heating rates of the radiation section and the convection section of the heat recovery coke oven are different, and specifically, the preparation method of the coke comprises the following steps:
(1) mixing asphalt, petroleum coke and coal B in proportion and crushing to obtain crushed materials, uniformly mixing 95 wt% of the crushed materials with the same crushed coal A and coal C (the average particle size of 95 wt% is less than 3mm) by taking the total weight of the crushed materials as a reference, and crushing to obtain blended coal, wherein 90 wt% of the blended coal is less than 3mm by taking the total weight of the blended coal, the water content of the blended coal is 10 wt%, and other performance indexes of the blended coal are shown in Table 3;
(2) tamping the blended coal 4 times to obtain briquette with specification of 13m × 3.5.5 m × 1m (length × width × height), and density of the briquette after tamping is 0.92t/m3；
(3) The coal cake is put into a heat recovery coke oven (the charging temperature is 800 ℃), then the radiation section is heated to 900 ℃ and the convection section is heated to 950 ℃ at the heating rate of 6 ℃/h, and coking is carried out for 9 days at the final temperature of 900 ℃ in the radiation section and 950 ℃ in the convection section.
The coke properties obtained in example 6 are shown in Table 4.
Example 7
The composition of the raw materials for preparing the coke is the same as that of the example 1, except that the final temperatures of the radiation section and the convection section of the heat recovery coke oven are different, and specifically, the preparation method of the coke comprises the following steps:
(1) mixing asphalt, petroleum coke and coal A in proportion and crushing to obtain crushed materials, uniformly mixing 95 wt% of the crushed materials with B coal and C coal (the average particle size of 95 wt% is less than 3mm) which are crushed in the same way by taking the total weight of the crushed materials as a reference, and crushing to obtain blended coal, wherein 90 wt% of the blended coal is less than 3mm by taking the total weight of the blended coal as a reference, the water content of the blended coal is 10 wt%, and other performance indexes of the blended coal are shown in Table 3;
(2) tamping the blended coal 4 times to obtain briquette with specification of 13m × 3.5.5 m × 1m (length × width × height), and density of the briquette after tamping is 0.92t/m3；
(3) The coal cake is put into a heat recovery coke oven (the charging temperature is 800 ℃), then the radiation section is heated to 960 ℃ and the convection section is heated to 1000 ℃ at the heating rate of 3 ℃/h, and coking is carried out for 9 days at the final temperature of the radiation section of 960 ℃ and the final temperature of the convection section of 1000 ℃.
The coke properties obtained in example 7 are shown in Table 4.
Example 8
According to the method of example 1, except that (1) the asphalt, the petroleum coke, the coal A, the coal B and the coal C are simultaneously mixed and then crushed to obtain blended coal;
based on the total weight of the blended coal, 90 wt% of the blended coal has an average particle size of less than 3mm, the water content of the blended coal is 10 wt%, and other performance indexes of the blended coal are shown in table 3.
The coke properties obtained in example 8 are shown in Table 4.
Table 2 examples 1-8 raw material compositions for producing coke
| Item | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Examples 6 to 8 |
| Coal A/wt% | 35 | 40 | 30 | 45 | 0 | 35 |
| Coal B/wt% | 17 | 16 | 15 | 0 | 40 | 17 |
| C coal/wt% | 40 | 40 | 35 | 47 | 52 | 40 |
| *GIs low in | 72 | 75 | 68 | 75 | 66 | 72 |
| **Ad is low/wt％ | 6.48 | 6.55 | 6.42 | 6.43 | 6.82 | 6.48 |
| ***Vdaf low/wt％ | 18.25 | 18.33 | 17.22 | 17.56 | 16.89 | 18.25 |
| Asphalt/wt% | 3 | 2 | 5 | 3 | 3 | 3 |
| Petroleum coke/wt% | 5 | 2 | 15 | 5 | 5 | 5 |
Note: caking index of low volatile coal consisting of coal a, coal B, and coal C;
ash content of low volatile coal composed of coal a, coal B, and coal C;
volatile components of low volatile coal composed of coal A, coal B and coal C.
TABLE 3 Performance parameters of the blended coals of examples 1-8
Comparative example 1
The composition of the raw material for preparing coke is the same as that of example 1, except that the final temperature of the radiation section is different from that of the convection section, and specifically, the coke is prepared by the following method:
(1) mixing asphalt, petroleum coke and coal A in proportion and crushing to obtain crushed materials, uniformly mixing 95 wt% of the crushed materials with B coal and C coal (the average particle size of 95 wt% is less than 3mm) which are crushed in the same way by taking the total weight of the crushed materials as a reference, and crushing to obtain blended coal, wherein 90 wt% of the blended coal is less than 3mm by taking the total weight of the blended coal as a reference, the water content of the blended coal is 10 wt%, and other performance indexes of the blended coal are shown in Table 3;
(2) tamping the blended coal 4 times to obtain briquette with specification of 13m × 3.5.5 m × 1m (length × width × height), and density of the briquette after tamping is 0.92t/m3；
(3) The coal cake is put into a heat recovery coke oven (the charging temperature is 800 ℃), then the radiation section is heated to 1100 ℃ and the convection section is heated to 1050 ℃ at the heating rate of 3 ℃/h, and coking is carried out for 9 days under the conditions that the final temperature of the radiation section is 1100 ℃ and the final temperature of the convection section is 1050 ℃.
The coke obtained in comparative example 1 had the performance parameters shown in Table 4.
Comparative example 2
The composition of the raw material for preparing coke is the same as that of example 1, except that the preparation method of coke is different, and specifically, the preparation method of coke is as follows:
(1) mixing asphalt, petroleum coke and coal A in proportion and crushing to obtain crushed materials, uniformly mixing 95 wt% of the crushed materials with B coal and C coal (the average particle size of 95 wt% is less than 3mm) which are crushed in the same way by taking the total weight of the crushed materials as a reference, and crushing to obtain blended coal, wherein 90 wt% of the blended coal is less than 3mm by taking the total weight of the blended coal as a reference, the water content of the blended coal is 10 wt%, and other performance indexes of the blended coal are shown in Table 3;
(2) tamping the blended coal 4 times to obtain briquette with specification of 13m × 3.5.5 m × 1m (length × width × height), and density of the briquette after tamping is 0.92t/m3；
(3) The coal cake is put into a heat recovery coke oven (the charging temperature is 800 ℃), then the radiation section is heated to 900 ℃ and the convection section is heated to 950 ℃ at the heating rate of 8 ℃/h, and coking is carried out for 5 days at the final temperature of 900 ℃ in the radiation section and 950 ℃ in the convection section.
The coke obtained in comparative example 2 had the performance parameters shown in table 4.
Comparative example 3
The process of example 1 was followed except that the low volatile coal had a caking index of 45; ash content 11.8 wt%; the volatile content was 23.6 wt%;
the coke was prepared in the same manner as in example 1, and the properties of the obtained coke are shown in Table 4.
Comparative example 4
The method of example 1, except that the blended coal comprises: 28 wt% coal A, 13 wt% coal B, 33 wt% coal C, 8 wt% bitumen and 18 wt% petroleum coke.
The coke was prepared in the same manner as in example 1, and the properties of the obtained coke are shown in Table 4.
TABLE 4 Performance parameters of the cokes obtained in the examples and comparative examples
It can be seen from the results of the examples, the comparative examples and the table 4 that the coke prepared by the method of the examples 1 to 7 of the present invention has large lumpiness and low ash content due to the adoption of the low volatile coal with medium and low caking property as the main raw material, and is particularly suitable for being used as casting coke for melting iron or rock wool. The raw materials for preparing the coke have low content of high-quality coal, reduce the production cost and save the fat coal resources.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (11)
1. A method for producing coke, comprising:
(1) preparing raw materials to obtain blended coal; wherein, based on the total weight of the raw materials, the raw materials comprise: 80-96 wt% of low-volatile coal, 2-5 wt% of binder and 2-15 wt% of reducing agent, wherein the caking index G of the low-volatile coal isIs low inG is more than or equal to 20Is low in＜90；
(2) The blended coal is made into coal cakes and then put into a heat recovery coke oven for coking;
wherein the final temperature of the radiation section of the heat recovery coke oven is 900-.
2. The production method according to claim 1, wherein the ash content A of the low volatile coald is lowLess than or equal to 8wt percent; and/or
Volatile matter V of the low volatile matter coaldaf lowV is more than or equal to 14 weight percentdaf low＜25wt％。
3. The production method according to claim 1 or 2, wherein the low-volatile coal contains at least one of a plurality of coals differing in caking index;
preferably, the low volatile coal comprises: bonding index GASatisfy 80 < GACoal A less than or equal to 90, caking index GBSatisfy 65 < GBCoal B less than or equal to 80 and caking index GcG is not less than 50CC coal less than or equal to 65;
preferably, the low volatile coal comprises, based on the total weight of the feedstock: 30-40 wt% of coal A, 15-20 wt% of coal B and 35-45 wt% of coal C.
4. The method of claim 3, wherein the formulating in step (1) comprises: mixing and crushing a thinning agent, a binder and one of a plurality of coals with different caking indexes contained in the low-volatile coal to obtain crushed materials;
respectively crushing other coals in the low-volatile coal with different caking indexes into crushed coals;
and mixing the crushed materials with the crushed coal and adjusting the moisture content to obtain the blended coal.
5. The preparation method according to any one of claims 1 to 4, wherein the blended coal simultaneously satisfies the following performance criteria: a. thed, preparing≤6.5wt％；15wt％≤Vdaf, preparation of≤20wt％；55≤GFitting for mixing≤70；8mm≤YFitting for mixing≤15mm；15mm≤XFitting for mixing≤30mm；0.7≤V/IFitting for mixing1 or less and MCIFitting for mixing≤3％。
6. The production method according to any one of claims 1 to 5, wherein in step (1), 88 to 98 wt% of the blended coal, based on the total weight of the blended coal, has an average particle size of < 3 mm;
preferably, the water content of the blended coal is 9-15 wt% based on the total weight of the blended coal;
preferably, in step (2), the density of the coal cake is 0.9t/m3-1.2t/m3。
7. The production method according to claim 1, wherein in the step (2), the temperature condition of the coking includes:
temperature rise procedure of convection section: heating to 900-;
temperature rise procedure of the radiation section: the temperature is raised from the charging temperature of the coal cake to 940-.
8. The method as claimed in claim 1, wherein the coking time is 7-14 days.
9. A coke produced by the production method according to any one of claims 1 to 8.
10. The coke of claim 9 wherein the coke has performance specifications of: more than 50 wt% of the coke has a particle size > 80 mm; a. thed, carbon≤8wt％；M40, carbon≥90wt％；M10, carbon≤8wt％；CRICarbon (C)≤25wt％；CSRCarbon (C)≥65wt％；PsCarbon (C)≤38％。
11. Use of the coke according to claim 9 or 10 in cupola and blast furnace smelting.
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