CN114511207B

CN114511207B - Method for optimizing use of outsourcing coke

Info

Publication number: CN114511207B
Application number: CN202210051354.3A
Authority: CN
Inventors: 杜屏; 张明星; 吴磊; 王永红; 邸航
Original assignee: Jiangsu Shagang Group Co Ltd; Zhangjiagang Hongchang Steel Plate Co Ltd; Jiangsu Shagang Iron and Steel Research Institute Co Ltd
Current assignee: Jiangsu Shagang Group Co Ltd; Zhangjiagang Hongchang Steel Plate Co Ltd; Jiangsu Shagang Iron and Steel Research Institute Co Ltd
Filing date: 2022-01-14
Publication date: 2024-06-21
Anticipated expiration: 2042-01-14

Abstract

The invention discloses a method for optimizing use of outsourcing coke, and belongs to the technical field of iron making. The method comprises the following steps: establishing an outsourcing coke quality evaluation method; counting coke quality average indexes according to suppliers and carrying the coke quality average indexes into a quality evaluation method for sorting; classifying and stacking cokes of different suppliers according to the sequencing result; the blast furnace uses coke with different quality grades in reasonable collocation according to classified stacking conditions. By popularizing the method, the quality of the coke entering the furnace can be maintained stable through matching of quality and difference under the condition of more suppliers, and the method is beneficial to promoting outsourcing coke suppliers to improve the quality qualification rate of the coke.

Description

Method for optimizing use of outsourcing coke

Technical Field

The invention belongs to the technical field of coking, and particularly relates to a method for optimizing the use of outsourcing coke, which can maintain stable quality of coke entering a furnace through matching of quality and difference under the condition that a steel enterprise has more suppliers, and can promote outsourcing coke suppliers to improve the quality qualification rate of coke through evaluation and scoring.

Background

The quality of the coke is critical to blast furnace smelting, and the high-quality coke can reduce the coke ratio and improve the smelting strength on the premise of enhancing the action of the internal framework of the blast furnace, and can also improve the coal ratio. Under the background of seeking and lowering the cost and improving the efficiency, low carbon and environmental protection of iron and steel enterprises, the method has the advantages of stabilizing the quality of the coke and improving the economic and technical indexes of the blast furnace.

For steel enterprises equipped with coke ovens, the quality of coke can be ensured to be stable for a long time under the condition of stable coking coal resource supply. For iron and steel enterprises without coke ovens or iron and steel enterprises with insufficient coke oven yield, the blast furnace production is mainly satisfied by purchasing outsourcing coke. Because of the frequent number of suppliers of outsourcing coke, the coking coal sources of different suppliers have great structural differences of coal blending, and the quality fluctuation of outsourcing coke is far greater than that of self-produced coke. To cope with this situation, most enterprises find out several single indexes mainly in combination with their own application effects to judge the quality of coke of each supplier or further improve purchasing standards. In this case, the blast furnace ironmaking cost increases and the quality of the charged coke still cannot be ensured to be stable for a long time.

Disclosure of Invention

The invention aims to provide a method for optimizing the use of outsourcing coke under the condition that the high-level smelting of the blast furnace is influenced due to the fact that suppliers are more and coke quality fluctuation is large when outsourcing coke production is used by the blast furnace of an iron and steel enterprise at present, and the stable and smooth operation of the blast furnace is realized under the condition of scientific collocation and stable coke quality entering the furnace.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

A method of optimizing the use of outsourced coke, the method comprising the steps of:

S1: establishing an outsourcing coke quality evaluation method;

S2: counting coke quality average indexes according to suppliers and carrying the coke quality average indexes into a quality evaluation method for sorting;

S3: classifying and stacking cokes of different suppliers according to the sequencing result;

s4: the blast furnace uses coke with different quality grades in reasonable collocation according to classified stacking conditions.

Based on the technical scheme, the total evaluation score of the outsourcing coke quality evaluation method is obtained by adding the evaluation scores of the CSR, the M25, the coke powder, the moisture, the ash and the sulfur, and the formula is as follows: t _{Total (S)}＝-(G_CSR+G_M25+G_{Coke powder}+G_{Moisture content}+G_{Ash content}+G_{Sulfur content}).

Based on the technical scheme, 2-8 coke silos are required to be configured for classifying and stacking the cokes of different suppliers according to the sequencing result.

Based on the technical scheme, the CSR, M25, coke dust, moisture, ash and sulfur single evaluation score G _X is a unitary quadratic equation, and the formula is: g _X＝aX² +bx+c. The T_{Total (S)}＝-{(a₁*CSR²+b₁*CSR+c₁)+(a₂*M25²+b₂*M25+c₂)+(a₃* coke breeze ²+b₃ x coke breeze+c ₃)+(a₄ x moisture ²+b₄ x moisture+c ₄)+(a₅ x ash ²+b₅ x ash+c ₅)+(a₆ x sulfur ²+b₆ x sulfur+c ₆) }.

Based on the technical scheme, a _i、b_i、c_i in the unitary quadratic equation formula of the CSR, M25, coke breeze, moisture, ash and sulfur single evaluation score Gx is determined by three conditions of the coordinate u of x when y=0, namely the index requirement, the curve slope k when y=0, namely the influence of index change on the fuel ratio and the curve symmetry axis x=v, namely the index optimal value, wherein the specific formula is as follows:

The beneficial effects of the invention at least comprise: when the blast furnace of the iron and steel enterprise uses outsourcing coke smelting, the quality of coke entering the blast furnace can be maintained to be relatively stable through scientific evaluation and collocation under the conditions of multiple suppliers and dispersed coke sources. Meanwhile, the evaluation method combining the characteristics of the unitary quadratic function is also beneficial to promoting outsourcing coke suppliers to improve the quality qualification rate of coke.

Drawings

FIG. 1 is a flow chart for optimizing the use of an outsource method.

Detailed Description

Examples

A method for optimizing the use of outsourcing coke combines the actual conditions of a certain factory, and CSR single evaluation scores G _CSR unitary quadratic equation comprises the following three conditions: csr=u=60 when G _CSR =0, k= -1.125 when G _CSR =0, The symmetry axis csr=v=73, calculating G _CSR＝0.0433*CSR² -6.3173 csr+223.27; The M25 single evaluation score G _M25 is a unitary quadratic equation with three conditions: when m25=u=92 and m25=0 at G _M25, k= -1.4 and the symmetry axis m25=v=96, G _M25＝0.175*M25² -33.6×m25+1610 is calculated; The three conditions of the focus end single evaluation score G _{Coke powder} unitary quadratic equation are: when G _{Coke powder} =0, end of coke=u=8, G _{Coke powder} =0, k=0.6, symmetry axis end of coke=v=0, calculating G _{Coke powder} =0.0375 end of coke ² -2.4; The moisture single evaluation score G _{Moisture content} is a unitary quadratic equation with three conditions: when G _{Moisture content} =0, moisture=u=6, and G _{Moisture content} =0, k=0.6, symmetry axis moisture=v=0, and G _{Moisture content} =0.05 moisture ² -1.8 is calculated; The three conditions of the ash single evaluation score G _{Ash content} unitary quadratic equation are: when G _{Ash content} =0, ash=u=13, G _{Ash content} =0, k=2, symmetry axis ash=v=11, calculated as G _{Ash content} =0.5 ash ² -11 ash+58.5; The three conditions of the sulfur component single evaluation score G _{Sulfur content} unitary quadratic equation are as follows: when G _{Sulfur content} =0, sulfur=u=0.8, and G _{Sulfur content} =0, k=16, and symmetry axis sulfur=v=0.55, G _{Sulfur content} =32 sulfur ² to 35.2 sulfur+7.68 are calculated. for some time, the plant had mainly 7 outsource coke suppliers, and the average index was calculated as shown in table 1 below. The data were carried into the quality assessment method for ranking, and the results are shown in Table 2. To achieve a classified stacking, the plant is built with four silos, of which 1# silos store coke from supplier D, 2# silos store coke from suppliers F and C, 3# silos store coke from suppliers a, B and E, and 4# silos store coke from supplier G. In the use process, the blast furnace is matched according to the mode of 1# silo to 2# silo to 3# silo to 4# silo=1:1:1:1. According to the method for optimizing the use of outsourcing coke, the quality of the coke entering the furnace is stabilized for a long time through scientific and objective evaluation and classification stacking of the coke under the condition of multiple suppliers and scattered coke sources.

TABLE 1 average quality of the outsourced focus for each supplier

Suppliers (suppliers)	CSR/％	M25/％	Coke end/%	Moisture/%	Ash/%	Sulfur content/%
							A	58.8	93.8	6	6.33	12.82	0.74
B	60.55	93.25	8.09	6.56	13.47	0.81
							C	62.5	93.27	8.33	6.79	12.81	0.75
D	65.2	94.28	6.12	5.57	12.33	0.78
							E	63.37	92.24	9.85	10.13	11.88	0.74
F	64.5	92.75	9.75	7.13	12.88	0.71
							G	59.79	92.15	14.6	11.88	13.32	0.83

TABLE 2 vendor ordering

Ordering of	Suppliers (suppliers)	CSR	M25	Coke powder	Moisture content	Ash content	Sulfur content	Evaluation of total score
									1	D	-4.54	-2.28	-1.00	-0.25	-1.12	-0.27	9.46
2	F	-4.06	-0.96	1.16	0.74	-0.24	-1.17	4.52
									3	C	-2.42	-1.49	0.20	0.51	-0.36	-0.73	4.30
4	A	1.52	-1.96	-1.05	0.20	-0.34	-0.87	2.50
									5	E	-3.17	-0.32	1.24	3.33	-1.61	-0.84	1.38
6	B	-0.49	-1.48	0.05	0.35	1.05	0.21	0.30
									7	G	0.35	-0.21	5.60	5.26	0.68	0.59	-12.28

It is apparent that the above examples in connection with the accompanying drawings are provided by way of illustration only and not by way of limitation of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.

Claims

1. A method of optimizing the use of outsourced coke, the method comprising the steps of:

S1, establishing an outsourcing coke quality evaluation method;

S2, counting coke quality average indexes according to suppliers and carrying the coke quality average indexes into a quality evaluation method for sorting;

S3, classifying and stacking cokes of different suppliers according to the sequencing result;

S4, reasonably collocating coke with different quality grades according to classified stacking conditions by the blast furnace;

The total evaluation score of the outsourcing coke quality evaluation method is obtained by adding the evaluation scores of the CSR, the M25, the coke dust, the moisture, the ash and the sulfur, and the formula is as follows: t _{Total (S)}＝-(G_CSR+G_M25+G_{Coke powder}+G_{Moisture content}+G_{Ash content}+G_{Sulfur content}); the CSR, M25, coke dust, moisture, ash and sulfur content single evaluation score Gx is a unitary quadratic equation, and the formula is: g _X＝a_iX²+b_iX+c_i, i.e., T_{Total (S)}＝-{(a₁*CSR²+b₁*CSR+c₁)+(a₂*M25²+b₂*M25+c₂)+(a₃* coke breeze ²+b₃ x coke breeze+c ₃)+(a₄ x moisture ²+b₄ x moisture+c ₄)+(a₅ x ash ²+b₅ x ash+c ₅)+(a₆ x sulfur ²+b₆ x sulfur+c ₆) }; a _i、b_i、c_i in the single-element quadratic equation formula of the CSR, M25, coke breeze, moisture, ash and sulfur component single-element evaluation score Gx is determined by three conditions of a coordinate value u of x when Gx=0, namely an index requirement, a curve slope k when Gx=0, namely the influence of index change on the fuel ratio, and a curve symmetry axis x=v, namely an index optimal value; the specific formula is as follows:

2. A method of optimizing use of outsourced focus according to claim 1, characterized by: and 2-8 coke silos are required to be configured for classifying and stacking the cokes of different suppliers according to the sequencing result.