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Preparation method of biomass charcoal composite fuel for blast furnace injection

A biomass charcoal and composite fuel technology, which is applied to biofuels, waste fuels, fuels, etc., can solve the problem of high ash and alkali metal content, and achieve the effects of low alkali metal content, improved quality, and high fixed carbon content.

Pending Publication Date: 2021-12-21
BAOSHAN IRON & STEEL CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a preparation method of a biomass charcoal composite fuel for blast furnace injection, which is to prepare a biomass charcoal composite fuel by mixing biomass charcoal and low metamorphic coal with hydrothermal carbonization treatment, Solve the problem of high content of ash and alkali metals in biomass charcoal by adopting hydrothermal carbonization technology; use the characteristics of high reactivity of biochar to promote the rapid ignition and combustion of high metamorphic coal, and use the performance of high metamorphic coal and high ash melting point to improve biomass The disadvantage of low melting point of fuel ash; in addition, dense, hard and waterproof block fuel can be obtained by heating and high-pressure pressing, which can meet the performance requirements of long-distance transportation and long-term storage, while avoiding the mixing of biomass charcoal and blast furnace injection coal for pulverization Segregation problems faced with injection

Method used

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  • Preparation method of biomass charcoal composite fuel for blast furnace injection
  • Preparation method of biomass charcoal composite fuel for blast furnace injection
  • Preparation method of biomass charcoal composite fuel for blast furnace injection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A biochar composite fuel for blast furnace injection, which uses soybean straw from agricultural production as a biomass raw material, and is prepared through the following steps:

[0046] (1) The collected soybean stalks are removed by a vibrating sieve and a strong magnetic iron remover to remove impurities such as small stones and iron wires, and are crushed into straw chips with a particle size of less than 3mm by a shearing mill.

[0047] The low-rank coal in this embodiment is lean coal (volatile content 16.7%, ash content 9.5%, G value 18), and a pulverizer is used to crush large pieces of lean coal into particles with a particle size of less than 3 mm.

[0048] The crushed soybean stalks and lean coal were weighed separately, and the mixture I was composed according to the mass ratio of 85:15, and the mixture I and the ironmaking wastewater were mixed according to an appropriate ratio, and then put into a high-pressure reactor for hydrothermal carbonization react...

Embodiment 2～5

[0054] Embodiments 2 to 5 provide a biomass charcoal composite fuel for injection into a biomass blast furnace. Compared with Embodiment 1, the difference in preparation lies in the mass ratio of soybean straw to lean coal, hydrothermal carbonization temperature, water The thermal carbonization time is shown in Table 1. Other preparation methods are roughly the same as in Example 1, and will not be repeated here. Table 2 shows the performance of the biochar composite fuel prepared in Examples 2-5.

[0055] The preparation conditions of table 1 embodiment 2~5 and the technical index of the hydrothermal charcoal of preparation

[0056]

[0057]

[0058] The performance of the biochar composite fuel prepared by table 2 embodiment 2~5

[0059] Example Example 2 Example 3 Example 4 Example 5 Bulk density (g / cm 3 )

2.39 2.43 2.48 2.49 Molding rate (%) 95 96 94 94 Compressive strength (MPa) 0.23 0.24 0.22 0.23 Moisture (%)...

Embodiment 6～10

[0063] Embodiments 6-10 provide a kind of biomass charcoal composite fuel for biomass blast furnace injection. Compared with Example 3, the difference is that the heat preservation temperature of hydrothermal charcoal, the preheating temperature of anthracite, and the temperature of hydrothermal charcoal anthracite The matching ratio is shown in Table 3. Other preparation methods are substantially the same as in Example 3, and will not be repeated here. Table 4 shows the properties of the biochar composite fuel prepared in Examples 6-10.

[0064] The preparation parameter of table 3 embodiment 6~10

[0065] Example Composite hydrothermal carbon insulation temperature (℃) Anthracite preheating temperature (℃) Composite hydrothermal charcoal: anthracite Example 6 140 650 30:70 Example 7 140 700 40:60 Example 8 140 700 50:50 Example 9 200 650 50:50 Example 10 250 650 50:50

[0066] Table 4 Example 6~10 prepares biochar...

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Abstract

The invention provides a preparation method of a biomass charcoal composite fuel for blast furnace injection, which comprises the following steps: mixing crushed biomass raw materials and low metamorphic coal, carrying out hydrothermal carbonization treatment, then mixing with preheated high metamorphic coal, carrying out heat preservation, and finally carrying out hot pressing treatment. According to the method, the yield of biomass hydrothermal carbonization is increased by utilizing mineral substances in the low-rank coal, and meanwhile, ash, volatile components and water in the low-rank coal can be partially removed, so that the caking property is improved. And then the mixture is mixed with the preheated high-metamorphic coal, so that the ignition point of the mixture can be improved, the explosiveness of the mixture is reduced, and the ash fusion point of the composite fuel can be further improved by utilizing the characteristic of high ash fusion point of the high-metamorphic coal. The biomass charcoal composite fuel can completely replace fossil fuel to be used for blast furnace injection, the emission amount of carbon dioxide and pollutants in the ironmaking production process is reduced, and in addition, the fuel formed through hot pressing has the advantages of being large in volume density and high in compressive strength and is suitable for long-distance transportation and long-term storage.

Description

technical field [0001] The invention relates to the technical field of blast furnace ironmaking, in particular to a preparation method of biomass charcoal composite fuel for blast furnace injection. Background technique [0002] With the continuous development of my country's economy and the continuous improvement of people's living standards, the demand for steel materials in social infrastructure continues to grow. In 2019, China's crude steel output reached 996 million tons, and its pig iron output reached 809 million tons, both hitting record highs. Due to the energy structure rich in coal, low in oil and lack of gas in my country, non-blast furnace ironmaking technologies such as gas-based direct reduction have not been popularized and applied. At present, the production process of blast furnace ironmaking is still the main one. Blast furnace ironmaking requires nearly 600kg of coal to produce 1 ton of molten iron. The amount of coal consumed by steel production in my ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/44C10L5/46C10L5/08C10L5/02
CPCC10L5/445C10L5/442C10L5/46C10L5/02C10L5/08Y02E50/10Y02E50/30
Inventor 王臣王广伟毛晓明熊林王川宁晓钧
Owner BAOSHAN IRON & STEEL CO LTD
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