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Method for evaluating cost performance of injected pulverized coal

An evaluation method and cost-effective technology, applied in the field of blast furnace smelting, which can solve the problems of high fixed carbon and poor reactivity

Pending Publication Date: 2021-07-06
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CO injection for blast furnace 2 There are not many studies on the sources of additional heat and C consumption of gas blast furnaces. Due to the large differences in the performance of mixed pulverized coal under different coal blending structures, some mixed pulverized coal has high carbon fixation and poor reactivity, and some mixed pulverized coal has a high But it is just the opposite. Therefore, there is an urgent need for a CO injection method for blast furnaces. 2 A method for evaluating the comprehensive cost-effectiveness of blast furnace pulverized coal in the gas technology process, so as to have a certain guiding significance for reducing carbon emissions in the blast furnace process

Method used

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  • Method for evaluating cost performance of injected pulverized coal
  • Method for evaluating cost performance of injected pulverized coal
  • Method for evaluating cost performance of injected pulverized coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Example 1: Evaluation of cost performance of pulverized coal when the blast furnace coal ratio is 180kg / t

[0084] First, detect each index of each coal type to be tested, set the minimum standard value of each index, and assign a value to the importance, as shown in Table 3.

[0085] Then, according to formula (3) and formula (4), the performance evaluation index K1 and the cost performance evaluation index K2 are calculated respectively, as shown in Table 3.

[0086] table 3

[0087]

[0088] According to the calculation model above, it can be seen that the cost performance of coal type 3 is the best, and the above coal blending structure will be used for the blending of coal type 3 during coal blending. Among them, the K1 value of pulverized coal 1 and pulverized coal 5 is less than 1, so the coal blending structure using the above two types of coal is not considered.

[0089] Then, calculate the new coal ratio according to the formula (5). When coal type 3 is ...

Embodiment 2

[0091] Example 2: Evaluation of cost performance of pulverized coal when the blast furnace coal ratio is 150-180kg / t

[0092] First, detect the various indicators of each coal type to be tested, set the minimum standard value of each indicator, and assign a value to the importance, as shown in Table 4.

[0093] Then, according to the formula (3) and the formula (4), the performance evaluation index K1 and the cost performance evaluation index K2 are calculated respectively, as shown in Table 4.

[0094] Table 4

[0095]

[0096] According to the above calculation model, it can be seen that the cost performance of coal type 9 is the best, and the above coal blending structure will be used for the blending of coal type 9 during coal blending.

[0097] When coal type 9 is used for injection, the CO 2 The injection rate is 10kg / t, and the blast furnace coal ratio is increased by 6.52kg / t. Coal type 9 has the best coal blending performance and cost.

Embodiment 3

[0098] Example 3: Evaluation of cost performance of pulverized coal when the blast furnace coal ratio is 145kg / t

[0099] First, detect each index of each coal type to be tested, set the minimum standard value of each index, and assign a value to the importance, as shown in Table 5.

[0100] Then, according to the formula (3) and the formula (4), the performance evaluation index K1 and the cost performance evaluation index K2 are calculated respectively, as shown in Table 5.

[0101] table 5

[0102]

[0103] According to the above calculation model, it can be seen that coal type 15 has the best cost-effectiveness, and the above coal blending structure will be used for the blending of coal type 15 during coal blending.

[0104] Then, calculate the new coal ratio according to the formula (5). When coal type 15 is used for injection, the reduction and combustion carbon consumption is 5.84kg / t; when no oxygen enrichment is added, the molten iron production is 8600t / d; CO inj...

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Abstract

The invention provides a method for evaluating the cost performance of injected pulverized coal. The method comprises the following steps: S1, measuring the fixed carbon content, the calorific value, the combustion rate at 700 DEG C and the reactivity at 1200 DEG C of mixed pulverized coal; S2, setting the minimum standard values of the fixed carbon content, the calorific value, the combustion rate at 700 DEG C and the reactivity at 1200 DEG C of the mixed pulverized coal under different coal ratio conditions; S3, assigning values to the fixed carbon content, the calorific value, the combustion rate at 700 DEG C and the importance degree of reactivity at 1200 DEG C of the mixed pulverized coal; S4, calculating a performance evaluation index K1 of the mixed pulverized coal; and S5, selecting the mixed pulverized coal of which the K1 value is greater than 1, and calculating a cost performance evaluation index K2 of the mixed pulverized coal. The evaluation method provided by the invention not only provides better heat compensation for increasing the consumption of CO2, but also has a better protection effect on coke in the furnace, and the coal blending cost can be reasonably controlled.

Description

technical field [0001] The invention relates to the technical field of blast furnace smelting, in particular, the invention relates to blast furnace injection CO 2 Method of Cost-Effective Evaluation of Pulverized Coal Injection in Gas Time Background technique [0002] In blast furnace production, pulverized coal is one of the important fuels, which has the function of reducing agent and exothermic agent, and can reduce the amount of coke and fuel cost at the same time. The carbon emissions of the blast furnace process account for 60%-70% of the total carbon emissions of iron and steel enterprises, reducing the carbon emissions of the blast furnace process (CO 2 emissions) play a key role in controlling the total carbon emissions of iron and steel enterprises. Reduction of blast furnace CO 2 The main ways of emissions are: reducing the combustion ratio; blast furnace injection of hydrogen, blast furnace injection of coke oven gas (hydrogen content 50-60%), blast furnace ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06C21B5/00
CPCG06Q10/06393C21B5/003
Inventor 刘文文李昊堃史永林贺佳贺淑珍范建军赵建伟王卫东
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD