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A kind of iron ore sintered biomass fuel and its preparation method and application

A biomass fuel and biomass technology, applied in the field of iron ore sintered fuel, biomass sintered fuel to replace fossil fuels to reduce emissions, and biomass sintered fuel, can solve the problems of asynchronous fuel combustion and large gap in reactivity, etc. Achieve the effects of reducing damage, low volatile content, and narrowing the difference in reactivity

Active Publication Date: 2021-02-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the large gap between the reactivity of biomass fuel used for iron ore sintering in the pyrolysis process and fossil fuels in the prior art, resulting in the defect of asynchronous fuel combustion in the sintering process

Method used

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  • A kind of iron ore sintered biomass fuel and its preparation method and application
  • A kind of iron ore sintered biomass fuel and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The mixed slag (SiO 2 70%, Fe 2 o 3 30%) were ground to 0.2~0.6mm, 0~0.005mm respectively, respectively 99% and 1% by mass percentage, mixed evenly, and then under mechanical pressure 400kg / cm 3 The mixed biomass is compressed into biomass particles under the conditions of 0.5 min of compression time and room temperature. The particles are first heated to 200°C at a heating rate of 20°C / min, and stay for 30 minutes to complete the low-temperature pretreatment, and then the particles are heated to 600°C at a heating rate of 5°C / min, and stay for 15 minutes, the carbonization process The atmosphere is kept at N 2 85%, Ar15%, the gas flow rate is 0.05L / min. The prepared biomass has a calorific value of combustion of 27MJ / kg, a volatile content of 2.0%, and a specific surface area of ​​20m 2 / g, porosity 19%, apparent density 1.7g / cm 3 . Substituting 40% coke powder with equal fixed carbon content for iron ore sintering can obtain a sintering index equivalent to t...

Embodiment 2

[0034] The mixed slag (SiO 2 60%, Fe 2 o 3 40%) were ground to 0.2 ~ 0.6mm, 0 ~ 0.005mm, according to the mass percentage were 98.5%, 1.5% mixed evenly, and then mechanical pressure 500kg / cm 3 Compress the mixed biomass into biomass particles under the conditions of compression time 1 min and compression temperature 70°C. The particles are heated up to 250°C at a heating rate of 15°C / min, and stay for 40 minutes to complete the low-temperature pretreatment, and then the particles are heated to 650°C at a heating rate of 4°C / min, and stay for 20 minutes, the carbonization process The atmosphere is kept at N 2 85%, Ar 15%, the gas flow rate is 0.05L / min. The prepared biomass has a calorific value of 28MJ / kg, a volatile content of 1.5%, and a specific surface area of ​​17m 2 / g, porosity 16%, apparent density 1.85g / cm 3 . Substituting 50% coke powder with equal fixed carbon content for iron ore sintering can obtain a sintering index equivalent to that of using coke powde...

Embodiment 3

[0036] The mixed slag (SiO 2 80%, Fe 2 o 3 20%) were ground to 0.2~0.6mm, 0~0.005mm respectively, respectively 98% and 2% according to the mass percentage, mixed evenly, and then under the mechanical pressure of 600kg / cm 3 Compress the mixed biomass into biomass particles under the conditions of compression time 1 min and compression temperature 70°C. The particles are heated up to 250°C at a heating rate of 15°C / min, and stay for 40 minutes to complete the low-temperature pretreatment, and then the particles are heated to 700°C at a heating rate of 3°C / min, and stay for 25 minutes, the carbonization process The atmosphere is kept at N 2 85%, Ar 15%, the gas flow rate is 0.05L / min. The heat of combustion of the prepared biomass is 30MJ / kg, the volatile matter is 1.2%, and the specific surface area is 15m 2 / g, porosity 14%, apparent density 2.0g / cm 3 . Substituting 55% coke powder with equal fixed carbon content for iron ore sintering can obtain a sintering index equi...

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Abstract

The invention discloses an iron ore sintered biomass fuel as well as a preparation method and application thereof. The method is to mix the biomass powder with the mixed powder of iron-selection tailings slag-silica tailings slag, and then press it into biomass granules; the biomass granules are placed in a protective atmosphere and then subjected to low-temperature pretreatment and high-temperature carbonization treatment to obtain The calorific value is 26~33MJ / kg, the volatile matter is 0.5~3%, and the specific surface area is 10~25m 2 / g, porosity 15-25%, apparent density 1.5-2.2g / cm 3 High-quality biomass fuel, which makes full use of the inert component SiO in slag 2 The comprehensive effect of weakening the thermochemical reactivity of biomass fuels and iron oxides promoting the efficient cracking of volatiles can replace the use of biomass fuels with a high proportion of fossil fuels, and achieve efficient emission reduction of SOx, NOx, and CO from the source 2 .

Description

technical field [0001] The present invention relates to biomass sintered fuel, in particular to an iron ore sintered fuel prepared by utilizing tailings slag and waste biomass as a resource and its method, and also relates to a method for reducing emissions by replacing fossil fuels with biomass sintered fuel, which belongs to iron and steel The field of sintering technology in the field of metallurgy. Background technique [0002] In the production process of iron and steel enterprises, the energy consumption of the sintering process accounts for about 10% of the total energy consumption, and the consumption of solid fuel accounts for about 80% of the energy consumption of the process. The solid fuel consumed by traditional sintering is mainly anthracite powder and coke powder. At present, the world's energy situation is becoming more and more severe, the price of fossil fuels is rising, and the cost of sintering remains high; at the same time, the combustion of fossil fue...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L5/44C10L9/10
CPCC10L5/442C10L5/445C10L9/10Y02E50/10Y02E50/30
Inventor 季志云范晓慧甘敏李浩锐倪佳苗陈许玲黄晓贤袁礼顺黄斌斌武钰峰吕薇唐庆余汪国靖
Owner CENT SOUTH UNIV
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