CN101358135A

CN101358135A - Coking coal blending method for producing high-heat strength coke

Info

Publication number: CN101358135A
Application number: CNA2007100939912A
Authority: CN
Inventors: 任学延; 张文成; 王春花; 时建
Original assignee: Shanghai Meishan Iron and Steel Co Ltd
Current assignee: Shanghai Meishan Iron and Steel Co Ltd
Priority date: 2007-07-31
Filing date: 2007-07-31
Publication date: 2009-02-04
Anticipated expiration: 2027-07-31
Also published as: CN101358135B

Abstract

The present invention relates to a method of coal blending for coking, in particular to a method of coal blending for coking, by which high-heat-intensity coke is produced. The present invention mainly resolves the technical problems of the prior coal blending method, such as inappropriate parameter selection and difficulty in promotion caused by the application of active components and inert components in ensuring the caking property of coal blending. The technical scheme of the method is as follows: the method of coal blending for coking, by which high-heat-intensity coke is produced, adopts rich coal, coking coal, gas coal and 1/3 coking coal, which are blended together; after blending, the microcosmic strong caking ratio is kept larger than 55 percent; the maximum thickness of the gelatinous layer is between 14mm and 18mm; and the caking index is between 80 and 85. The method is mainly used for the production of high-heat-intensity coke.

Description

A kind of coke making and coal blending method of producing high-heat strength coke

Technical field:

The present invention relates to a kind of method of coke making and coal blending, particularly a kind of coke making and coal blending method of producing high-heat strength coke.

Background technology:

The coking technology of China suitably cooperates to come coking with gas, fertilizer, Jiao, bituminous coal of different nature such as thin usually, and this can improve the bonding process in the process of coking, guarantees the even structure of coke.The coal blending technology that each enterprise adopts all is the experience blending method of groping out according to the character of the coking coal of each enterprise usually, the experience blending method is applicable to the situation that the coal source is stable, the fluctuation of ature of coal amount is little, when coming texture of coal to change or ature of coal when big fluctuation takes place, the blindness of experience coal blending will influence the quality of coal blending, cause the fluctuation of coke quality, this is very disadvantageous to production.

Domestic most of coking enterprise, coking coal resource 90% relies on domestic coal resource.Because the special geologic condition of the formation in Chinese coalfield, just there is either large or small difference in the metamorphic grade between the same exploitation point different coal, can't obtain single coal seam coal; In addition, coal production producer is ordered about by interests, and meeting is blending coking coal inferior in high-quality caking coal artificially, and these factors all cause China's coking enterprise to be had in the face of the puzzlement of mixed coal phenomenon.

Adopting the coal petrography analytical procedure at the mixed coal phenomenon is the comparison effective measures of generally acknowledging in the present industry, and overseas utilization coal petrography analytical procedure is carried out coal-blending coking, has obtained good coal blending effect, wherein relatively is typically A Mosuofu and Shi Piluofa.Use this method, form and the reflectivity distribution plan as long as record the coal petrography of coal blending, just can calculate the coal petrography parameter value of these two predictions of thinization exponential sum coking property coefficient coke quality, on iso-intensity curve figure, find the point that meets these two indexs, can infer the intensity that coke.During the disclosed Chinese patent 02104195.4 of the people such as Huang Suhe of Shanxi Coking Plant group " utilizes the coal petrography analysis to carry out the method for coal-blending coking " at home, on A Mosuofu and Shi Piluo method basis, provide a kind of coal petrography coal-blending coking method of simplification.Close therewith Zhou Shiyong coal petrography coal blending method in addition, this method is introduced two coal blending indexs: a total amount ∑ I for inert component in the coal blending; Another is X-coordinate for the average coking property index M B of active ingredient in the coal blending with ∑ I, and MB is an ordinate zou, after the coke that obtains with the 200kg testing coke oven is done Micoud nurse drum test, the abrasive wear resistance curve such as remakes out, predicts coke strenth with this.

More than several coke making and coal blending methods all be ultimate principle according to the coal petrography coal blending, following some is not enough but all exist.Coking coal that the first is external and domestic existence are than big-difference, and external coal-blending coking technology also is not suitable for domestic.It two is to use vitrinite reflectance mean value as prediction index, because vitrinite reflectance can only reflect single metamorphic grade of planting coal, is inaccurate with this parameter only for mixed coal or mixed coal; It three is bonding characteristics that above method major applications active ingredient and inert component guarantee coal blending, but has human factor because single activity, inert component of planting coal measured, so its application exists difficulty; It four does the iso-intensity curve that is fit to this enterprise, needs to consume a large amount of financial resources and material resources.

Therefore, can not overcome above deficiency, the method for coal petrography coal blending just is difficult in China and is applied widely.

Summary of the invention:

The coke making and coal blending method that the purpose of this invention is to provide a kind of simple and practical production high-heat strength coke.Mainly solve improper and application of active component of parameters selection that existing blending method exists and inert component and guarantee the technical problems such as popularization difficulty that the bonding characteristic of coal blending exists.

Technical scheme of the present invention is: a kind of coke making and coal blending method of producing high-heat strength coke, adopt rich coal, coking coal, bottle coal and 1/3 coking coal to be mixed, little strong sticking ratio after control is mixed is greater than 55%, and maximum thickness of plastic layer is at 14～18mm, and caking index is 80～85.

Coke making and coal blending all needs to guarantee the adhesive property and the metamorphic grade of coke making and coal blending, has only these two technological properties to ensure, just may refine out high-quality coke.

For guaranteeing the metamorphic grade of coke making and coal blending, little strong sticking notion than (WQN) has been proposed, promptly, reflectivity is appeared at the shared ratio of the frequency in 0.9～1.55% scope according to the random reflectance of vitrinite distribution plan of mixed coal, be defined as little sticking than (WQN).To glue than (WQN) as an index that characterizes the coke making and coal blending metamorphic grade slightly.

For guaranteeing the bonding characteristic of coke making and coal blending, adopt general maximum thickness of plastic layer of domestic use (Y) and caking index (G) to characterize the bonding characteristic of mixed coal.

The invention has the beneficial effects as follows: introduced the notion of " little sticking ratio " among the present invention, used for reference traditional strong sticking notion,, defined the shared ratio of strong caking coal, be convenient to understand and use from the angle of microcosmic than (allocation ratio of strong caking coal in the coke making and coal blending).With little sticking index that likens to the metamorphic grade that characterizes coal, overcoming the metamorphic grade that vitrinite reflectance can only reflect single coal seam coal among the present invention, is inaccurate problem for mixed coal with this parameter, is fit to mixed coal situation domestic coking coal resource on the high side.The present invention adopts several single coal cooperation carrying out coking of planting, and greater than 55%, Y is at 14～18mm by control WQN, and G is 80～85, and other ash content sulphur content index meets the requirement of secondary metallurgical to coal blending.Carry out coal-blending coking by traditional coke oven, the cold strength M40 of the coke that obtains and M10 and ash content, sulphur content are within the scope that secondary metallurgical requires, and particularly hot strength of coke is greater than 65%.Characterize close-burning index among the present invention and select macroscopical cohesiveness index, be convenient to use, overcome with microcosmic activity, inert component greatly, measure the big problem of individual difference as the workload that prediction index exists.The present invention adopts the microcosmic index of coal blending and macro-indicators in conjunction with as the major control index, overcome all with the blindness of macro-indicators with all with the representativeness of microcosmic index, have very strong practicality.

Embodiment:

Each proportioning adopts domestic several single coal of planting to cooperate, and the every quality index of used each coal as shown in Table 1.

The single coal analysis data sheet of planting of table one

Coal	Rich coal 1	Rich coal 2	Coking coal 1	Coking coal 2	Coking coal 3	Bottle coal	1/3 coking coal 1	1/3 coking coal 2
Coal	Rich coal 1	Rich coal 2	Coking coal 1	Coking coal 2	Coking coal 3	Bottle coal	1/3 coking coal 1	1/3 coking coal 2	Ash content, Ad, %	8.68	9.79	9.91	10.71	9.35	7.70	9.56	10.46
Sulphur content, St, d, %	1.58	0.94	0.40	0.42	0.82	0.69	0.33	0.43	Ash content, Ad, %	8.68	9.79	9.91	10.71	9.35	7.70	9.56	10.46
Sulphur content, St, d, %	1.58	0.94	0.40	0.42	0.82	0.69	0.33	0.43	Volatile matter, Vd, %	29.81	24.32	23.22	19.12	18.70	36.49	29.67	28.34
Caking index G	91	92	86	80	84	83	71	87	Volatile matter, Vd, %	29.81	24.32	23.22	19.12	18.70	36.49	29.67	28.34
Caking index G	91	92	86	80	84	83	71	87	Maximum colloid thickness Y, mm	26.9	24.5	17.8	13.4	13.9	11.8	11.4	17.6
Random reflectance of vitrinite R0, %	0.927	1.146	1.193	1.408	1.439	0.679	0.735	0.999	Maximum colloid thickness Y, mm	26.9	24.5	17.8	13.4	13.9	11.8	11.4	17.6
Random reflectance of vitrinite R0, %	0.927	1.146	1.193	1.408	1.439	0.679	0.735	0.999	The mixed coal situation	Single coal	Single coal	Mixed coal	Mixed coal	Mixed coal	Single coal	Single coal	Mixed coal

Utilize above several coals, select 7 coals to carry out coal-blending coking at every turn, mix proportion scheme as shown in Table 2.

Table two coal blending mix proportion scheme table

Coal	Rich coal 1	Rich coal 2	Coking coal 1	Coking coal 2	Coking coal 3	Bottle coal	1/3 coking coal 1	1/3 coking coal 2
Coal	Rich coal 1	Rich coal 2	Coking coal 1	Coking coal 2	Coking coal 3	Bottle coal	1/3 coking coal 1	1/3 coking coal 2	A1	17	8	14	10	13	23	15
A2	15	10	18	10	10	22		15	A1	17	8	14	10	13	23	15
A2	15	10	18	10	10	22		15	A3	20		18	10	10	17	10	15
A4	15	10	14	10	13	23	15		A3	20		18	10	10	17	10	15

By above coal blending mix proportion scheme, the mixed coal data that obtain as shown in Table 3.

Table three mixed coal qualitative data table

Enterprise number	Ash content, Ad, %	Sulphur content, St, d, %	Volatile matter, Vd, %	Caking index G	Maximum colloid thickness Y, mm	Little sticking than WQN, %
Enterprise number	Ash content, Ad, %	Sulphur content, St, d, %	Volatile matter, Vd, %	Caking index G	Maximum colloid thickness Y, mm	Little sticking than WQN, %	A1	9.17	0.81	27.27	82	14.8	58
A2	9.3	0.82	27.41	87	17.1	59.62	A1	9.17	0.81	27.27	82	14.8	58
A2	9.3	0.82	27.41	87	17.1	59.62	A3	9.47	0.76	26.46	81	15.1	59.8
A4	9	0.78	26.24	82	13.1	64	A3	9.47	0.76	26.46	81	15.1	59.8

Utilize above coal blending, carry out coal-blending coking by traditional 4.3m coke oven, the coke quality data that obtain as shown in Table 4.

Table four coke quality analytical data index

Enterprise number	Ash content, Ad, %	Sulphur content, St, d, %	Volatile matter, Vd, %	Shatter strength M40, %	Abrasive wear resistance M10, %	Coke reactivity CRI, %	Post-reaction strength CSR, %
Enterprise number	Ash content, Ad, %	Sulphur content, St, d, %	Volatile matter, Vd, %	Shatter strength M40, %	Abrasive wear resistance M10, %	Coke reactivity CRI, %	Post-reaction strength CSR, %	A1	12.14	0.68	1.31	80.2	7.1	23.65	66.98
A2	12.12	0.74	1.34	81.6	7.0	25.05	65.93	A1	12.14	0.68	1.31	80.2	7.1	23.65	66.98
A2	12.12	0.74	1.34	81.6	7.0	25.05	65.93	A3	12.72	0.63	1.00	80	7.3	23.80	66.85
A4	12.49	0.66	1.02	80	7.1	24.55	66.37	A3	12.72	0.63	1.00	80	7.3	23.80	66.85

As can be seen, hot strength of coke has all reached the higher level greater than 65% from table four.

Claims

1, a kind of coke making and coal blending method of producing high-heat strength coke is characterized in that: adopt rich coal, coking coal, bottle coal and 1/3 coking coal to be mixed, the little strong sticking ratio after control is mixed is greater than 55%, and maximum thickness of plastic layer is at 14～18mm, and caking index is 80～85.