CN-122012828-A - Blast furnace coal injection process utilizing furfural carbon for iron and steel enterprises

CN122012828ACN 122012828 ACN122012828 ACN 122012828ACN-122012828-A

Abstract

The invention relates to the technical field of blast furnace ironmaking, and discloses a blast furnace coal injection process for utilizing furfural carbon in iron and steel enterprises, which comprises the following steps of S1, loading the furfural carbon with moisture content lower than 50% and dry-based volatile content lower than 75% into a furfural carbon storage bin with a sealing device through a conveying device, S2, weighing the furfural carbon, anthracite and bituminous coal, loading the furfural carbon in the middle and bituminous coal in an upper sequence into a raw coal conveying belt of a pulverizing workshop, and S3, loading the furfural carbon and the pulverized coal into a medium-speed mill through the conveying belt, uniformly mixing, drying and pulverizing in the medium-speed mill to obtain mixed powder with the granularity of less than 0.074mm and the moisture content of less than 2.8%, wherein the bulk density of the mixed powder is between 0.55g/cm <3 > -0.76g/cm <3 >. The invention expands the application of the furfural carbon in the field of steel production, improves the utilization value of the furfural carbon, reduces the dependence of fossil fuel of blast furnace ironmaking production teams, and reduces the carbon dioxide emission of blast furnace procedures.

Inventors

LI AIFENG
WANG GUANGWEI
ZHANG NAN
LONG FANG
GUO FENG
NING XIAOJUN
LIU YUEJIAN
WU FEI

Assignees

河南钢铁集团有限公司
安阳钢铁集团有限责任公司
北京科技大学

Dates

Publication Date: 20260512
Application Date: 20260227

Claims (8)

1. The blast furnace coal injection process for the iron and steel enterprises by utilizing the furfural carbon is characterized by comprising the following steps of: S1, loading furfural carbon with moisture content lower than 50% and dry-base volatile content lower than 75% into a furfural carbon storage bin with a sealing device through a material conveying device; s2, weighing the furfural carbon, anthracite and bituminous coal, then placing the anthracite in the middle, and sequentially loading the bituminous coal in a raw coal conveying belt of a milling workshop; S3, loading the furfural carbon and the pulverized coal into a medium-speed mill through a conveying belt, uniformly mixing, drying and crushing in the medium-speed mill to obtain mixed powder with the granularity of less than 0.074mm and 40% -95% and the moisture content of less than 2.8%, wherein the bulk density of the mixed powder is 0.55g/cm 3 -0.76g/cm 3 ; And S4, the mixed powder is blown to a blast furnace tuyere through a coal powder bin, a blowing tank, a coal powder distributor and a spray gun, and is burnt in contact with high-temperature oxygen-enriched air in a swirling area of the blast furnace tuyere to provide heat and a reducing agent for blast furnace smelting.
2. The process for blast furnace coal injection by utilizing furfural carbon for iron and steel enterprises according to claim 1, wherein the ash content of the dry base of the furfural carbon in the step S1 is lower than 15%, and the time for storing the furfural carbon in a storage bin is not more than 15 days.
3. The blast furnace coal injection process for the iron and steel enterprises by utilizing the furfural carbon according to claim 1, wherein in the step S2, the furfural carbon, the anthracite and the bituminous coal are loaded into a storage bin by utilizing a material taking machine, and are conveyed to a raw coal conveying belt of a pulverizing workshop after being weighed by a belt scale, and the dry basis weight ratio of the furfural carbon to the anthracite and the bituminous coal is respectively positioned in a range of 1% -30%, 45% -60% and 10% -40%.
4. The process for blast furnace coal injection by utilizing furfural carbon for iron and steel enterprises according to claim 1, wherein in the step S3, the flue gas temperature at the inlet of the medium speed mill is 250-350 ℃, the oxygen content is 3-10%, and the flue gas amount is 1000-2000m 3 /mixed powder.
5. The process for blast furnace coal injection by using furfural carbon for iron and steel enterprises according to claim 1, wherein the calorific value of the mixed powder in the step S3 is more than 25000kJ/kg, the ignition point is more than 300 ℃, and the return flame length of the long-tube type coal powder explosiveness test experiment is less than 80mm.
6. The process for injecting coal into a blast furnace by using furfural carbon for iron and steel enterprises according to claim 1, wherein in the step S4, the oxygen content in the pulverized coal bin is less than 5%, the storage time of the mixed powder in the pulverized coal bin is not more than 12 hours, and the coal conveying gas in the injection tank is high-pressure nitrogen.
7. The process for blowing coal into the blast furnace by utilizing furfural carbon for iron and steel enterprises according to claim 1, wherein the mixed powder in the step S4 is blown into molten iron with the quantity of 150-200kg/t in front of a blast furnace tuyere, the temperature of oxygen-enriched air is 1250-1350 ℃, the oxygen content in the air is 3-10%, and the air quantity is 5000-10000 m 3 /t.
8. The process for blowing coal into the blast furnace by utilizing furfural carbon for iron and steel enterprises according to claim 1, wherein the combustion rate of the mixed powder in the step S4 is more than 60% in a revolving area of a blast furnace tuyere, heat is provided for the blast furnace and is more than 11000kJ/kg, components of a reducing agent generated by combustion in the revolving area of the blast furnace tuyere are located in a range of 30% -50% of CO, 40% -60% of H 2 :5%-15%、N 2 , and the temperature of the reducing agent is 2000-2300 ℃.

Description

Blast furnace coal injection process utilizing furfural carbon for iron and steel enterprises Technical Field The invention relates to the technical field of blast furnace ironmaking, in particular to a blast furnace coal injection process utilizing furfural carbon in iron and steel enterprises. Background The blast furnace is the iron-making production process with highest efficiency and lowest cost at present, but a large amount of coke and coal injection are required to be consumed in the production process, so that the carbon emission of steel products is large, and the pressure in the strategic background of coping with climate change and promoting green low-carbon development is increased gradually. Biomass energy has the natural attribute of low carbon, and the partial substitution of fossil fuel by biomass energy is applied to blast furnace production, so that the biomass energy is a main technical measure for reducing carbon dioxide emission in the ironmaking process. The furfural carbon is a solid waste produced by preparing furfural from agricultural and forestry waste (including corncob, bagasse, agricultural straw, waste timber and the like), has the characteristics of large production amount, low price and the like, and is mainly applied to the fields of organic fertilizer production, boiler fuel, active carbon preparation and the like at present. The furfural carbon has high moisture content (40% -60%), large granularity (average granularity is about 5 mm), and has a pungent smell due to the fact that the furfural carbon is rich in byproducts such as acetic acid, and the furfural carbon needs to be dried, ground and deodorized in the use process. The method can remove the pungent smell of the furfural carbon, but can further increase the moisture content and bring the problem of wastewater treatment, and the baking and heating can reduce the moisture content of the furfural carbon, and can also bring the obvious increase of cost, in addition, the volatile content of the furfural carbon is high, and the furfural carbon is easy to catch fire in the drying process, so that the potential safety hazard is brought. Whether the furfural carbon from agricultural and forestry waste is applied and produced in a blast furnace can be solved, on one hand, the problem of harmless treatment of solid waste of biomass chemical enterprises can be solved, and on the other hand, the dependence of blast furnace ironmaking production on fossil fuel can be reduced. The blast furnace workshop of the iron-mill has perfect equipment such as raw material storage, weighing, blending, crushing, drying, blowing and the like, and the process parameters of each link of the coal powder blowing process of the blast furnace can be adjusted to realize drying, grinding, smell removal and uniform mixing with the coal powder of the furfural carbon, so that the low-carbon substance of the coal powder blown by the blast furnace can be applied to iron-making production. At present, no report is made on the technology of blast furnace coal injection by using furfural carbon in iron and steel enterprises, so that a proper technology is necessarily found by combining the physical and chemical attribute characteristics of the furfural carbon and the production technology characteristics of the blast furnace coal injection, and the furfural carbon is safely, efficiently, cleanly and low-carbon to be applied to the production of the blast furnace coal injection. Disclosure of Invention Aiming at the problems, the invention provides a blast furnace coal injection process for iron and steel enterprises by utilizing furfural carbon, and the process parameters of each link of the process of injecting pulverized coal into the blast furnace are adjusted to realize safe and efficient application of coarse-particle furfural carbon with high moisture, high volatile matters and pungent smell in the field of blast furnace ironmaking, thereby realizing resource utilization of agriculture and forestry waste processing residues, reducing dependence of blast furnace ironmaking production on fossil fuel and having remarkable economic, social and ecological benefits. In order to achieve the above purpose, the invention adopts the following technical scheme: A blast furnace coal injection process for iron and steel enterprises by utilizing furfural carbon comprises the following steps: S1, loading furfural carbon with moisture content lower than 50% and dry-base volatile content lower than 75% into a furfural carbon storage bin with a sealing device through a material conveying device; s2, weighing the furfural carbon, anthracite and bituminous coal, then placing the anthracite in the middle, and sequentially loading the bituminous coal in a raw coal conveying belt of a milling workshop; S3, loading the furfural carbon and the pulverized coal into a medium-speed mill through a conveying belt, uniformly mixing, drying and crushing in the medium-speed mill to