CN114635035B - Sintering method of solid-free fossil fuel based on coupling heat supply of multicomponent gas medium and waste biomass - Google Patents
Sintering method of solid-free fossil fuel based on coupling heat supply of multicomponent gas medium and waste biomass Download PDFInfo
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- CN114635035B CN114635035B CN202011486207.6A CN202011486207A CN114635035B CN 114635035 B CN114635035 B CN 114635035B CN 202011486207 A CN202011486207 A CN 202011486207A CN 114635035 B CN114635035 B CN 114635035B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
- C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
Abstract
The invention discloses a sintering method of solid-free fossil fuel based on multi-component gas medium and waste biomass coupling heat supply, which comprises the steps of mixing and granulating biomass fuel completely instead of fossil fuel and sinter raw materials, and feeding the obtained granules into a sintering machine for ignition and sintering after distribution; according to the difference of heat distribution in different areas of a material layer in the sintering process, the ratio of combustible components and combustion-supporting components in a gas medium and the temperature of hot waste gas are comprehensively regulated, and different multi-component gas mediums are respectively introduced into different areas, so that not only is sufficient heat provided for material sintering, but also the matching property of heat transfer and fuel combustion of the material layer can be regulated, and the heat distribution of the material layer is balanced and reasonable.
Description
Technical Field
The invention relates to a sintering method, in particular to a sintering method of solid-free fossil fuel with multi-component gas medium and waste biomass coupled heat supply, and in particular relates to a sintering method which does not add coke powder into a material layer and provides heat for the material layer by means of high-concentration hydrogen-containing gas, biomass fuel and high temperature, belonging to the sintering industry in the field of ferrous metallurgy.
Background
Sintering is the first step of high-temperature process in the iron and steel industry in China, has high energy consumption and large pollutant discharge amount, is the link with the largest atmospheric pollution load in the iron and steel industry, and is also the key point of pollutant treatment. The conventional sintering process mainly uses solid fossil fuel such as coke, anthracite and the like as heat source to carry out high-temperature physicochemical reaction, but the combustion process of the solid fossil fuel is CO 2 、SO 2 The main source of NO. Therefore, effectively reducing the consumption of solid fossil fuel in the sintering process is an important way to reduce the emission of atmospheric pollutants.
Compared with solid fossil fuels such as coke powder, the biomass fuel has the advantages of low nitrogen, low sulfur and renewable, is considered to not increase the content of atmospheric carbon dioxide greenhouse gas in the forming and using process, and can effectively solve the problem of CO if replacing the solid fossil fuel 2 、SO 2 And the emission of pollutants such as NO. Because the characteristic difference of the biomass fuel and the chemical fuel is large, the combustion reaction activity is high, CO is easy to generate when the sinter bed burns, the concentration of CO in the flue gas can be increased, the pollution is brought, the energy waste is caused, the matching property of the heat transfer front speed and the combustion front speed can be damaged by the high reaction activity of the biomass fuel, and the heat distribution uniformity of the material bed is further deteriorated. This is also an important factor limiting its difficulty in replacing solid fossil fuels in high proportions.
The technology of gas injection at the surface of the sintered material is the earliest reduction of CO by JFE iron and steel company 2 The new sintering technology developed after the end of sintering ignition is to spray and supplement natural gas and other gas fuel into the middle and upper part of the material layer to reduce the use of solid fossil fuelThe amount in turn reduces the emission of atmospheric pollutants from the source. The combustion of the gas fuel can widen the sintering high-temperature range and directionally supplement the heat deficiency of the upper sintering ore layer, thereby being beneficial to producing high-quality and homogeneous sintering ore. The gas injection technology has successful production practice in enterprises such as Shao steel in China, and obtains larger economic and environmental benefits, but the use proportion of the gas fuel is low due to the condition of sintering, oversmelting and the like, and the gas fuel is only used as a supplement of solid fossil fuel at present, and can replace coke powder with lower dosage. Spraying water vapor on the surface of the sintered material is considered as a method for improving the combustion efficiency of the solid fuel and reducing the emission of CO in the flue gas. However, the current technology does not solve the problem of greatly reducing or even completely eliminating the use of solid fossil fuels. The biomass fuel is clean and renewable, but the high combustion reactivity of the biomass fuel enables the CO production amount in the combustion process to be higher than that of the conventional fossil fuel, on the one hand, when the proportion of the substituted fossil fuel is more than 60%, the matching property of the combustion front and the heat transfer front speed can be destroyed, the retention time and the highest temperature of a high-temperature area required by mineral melting are shortened, and the adverse effect caused by complete substitution can be further aggravated. In view of the above, the invention aims to develop a method for realizing solid-free fossil fuel sintering by coupling heat supply of gas medium and waste biomass, and the method can maximize emission reduction of CO from the perspective of optimizing fuel structure 2 、SO 2 The purpose of NO has positive pushing effect on pushing the transformation process of the ultralow emission of the steel industry.
Disclosure of Invention
Aiming at the defects of the prior art that the biomass raw material replaces fossil raw material to perform the iron ore sintering process, the invention aims to provide a sintering method for completely replacing coke powder in a material layer by biomass carbonized fuel and greatly improving the gas fuel injection concentration.
In order to achieve the technical aim, the invention provides a sintering method of solid-free fossil fuel based on coupling heating of a multi-component gas medium and waste biomass, which comprises the steps of mixing and granulating raw materials including iron ore, biomass fuel, flux and return ore, and feeding the obtained granules into a sintering machine for ignition and sintering after distribution; the sintering material surface in the sintering machine is divided into three independent sealing areas of an area I, an area II and an area III from the ignition end to the sintering end in sequence, and multicomponent gas mediums are led into the three sealing areas; the multi-component gas medium comprises hydrogen-containing gas, water vapor and oxygen-containing gas, and the concentration of the hydrogen-containing gas in the multi-component gas medium sprayed into the zone I, the zone II and the zone III is decreased, the water vapor content is increased and the temperature of the oxygen-containing gas is increased.
According to the technical scheme, the area between the ignition end and the sintering end of the sintering material surface is divided into three areas in sequence, the area I is sprayed with the hydrogen-containing gas with higher concentration, the heat released by combustion of the area I can be utilized to quickly make up the heat shortage of the upper material layer, the area II and the area III are sprayed with the hydrogen-containing gas with lower concentration or not sprayed with the hydrogen-containing gas according to the heat supply requirement, and the balanced distribution of the heat of the whole material layer is realized by utilizing the latent heat in the hot waste gas, so that the high-quality sintering ore can be produced.
The technical proposal of the invention adopts the technical proposal that the combustible components in the multicomponent gas are burnt in the high temperature area at the upper part of the burning zone and then are sprayed with water vapor, O 2 、N 2 Is composed of CO 2 、H 2 O(g)、O 2 、N 2 The specific heat capacity of the formed composite gas is larger than that of a pure air medium, so that the heat transfer front speed of the sinter bed is improved, and the matching property between the sinter bed and the combustion speed of biomass fuel is improved.
As a preferable scheme, the biomass fuel has a heat value of 25-30 MJ/kg, a volatile content of 2-4%, a porosity of 20-30% and a specific surface area of 17-26 m 2 Per gram, the mass percentage of the particles with the particle diameter of more than 5mm is not more than 15 percent, and the mass percentage of the particles with the particle diameter of less than 3mm containsThe amount is not more than 20%. The preferred fossil fuels help to reduce the variability between biomass fuel combustion rates and conventional fossil fuels, thereby providing a better match between combustion front rates and heat transfer front rates.
As a preferable scheme, the biomass fuel comprises at least one of forestry processing waste pyrolytic carbon, densely formed agricultural waste pyrolytic carbon, kernel carbon and shell carbon. The biomass raw materials are urban garden solid waste and agricultural waste straw as main sources, so that the recycling and the digestion of the bulk solid waste are realized, and the biomass raw materials are renewable resources and have wide raw material sources.
As a preferred embodiment, the multicomponent gas medium injected in the region I has a hydrogen-containing gas content of 1.0 to 2.7vol%, a water vapor content of 0 to 0.3vol% and the balance being ambient air.
As a preferred embodiment, the multicomponent gas medium injected in the zone II has a hydrogen-containing gas content of 0.5 to 1.5% by volume, a water vapor content of 0.1 to 0.4% by volume and the remainder being hot exhaust gases at 100 to 150 ℃.
As a preferred embodiment, the multicomponent gas medium injected in the region III contains 0% by volume of hydrogen-containing gas and 0.3 to 0.6% by volume of water vapor, with the remainder being hot waste gases at 150 to 300 ℃.
The technical proposal of the invention comprises a certain proportion of water vapor in the multicomponent gas medium sprayed in the area I, the area II and the area III, wherein the water vapor is mainly used for generating water gas reaction with incandescent solid carbon particles, promoting the combustion of fuel particles, realizing the efficient release of the chemical energy of the solid fuel, and oxidizing CO generated in the combustion process into CO by generating high-activity OH free radicals 2 The method can further improve the combustion effect and reduce the emission concentration of CO in the sintering flue gas, and can solve the problem of high emission concentration of CO in the flue gas caused by high reactivity of biomass fuel to the greatest extent.
As a preferred embodiment, the hydrogen-containing gas includes at least one of coke oven gas, natural gas, hydrogen, and biomass pyrolysis gas.
As a preferable scheme, the water vapor is low-pressure water vapor self-produced by a steel plant, the pressure P is less than or equal to 2.5MPa, and the temperature T is less than or equal to 400 ℃. The abundant self-produced low-pressure steam in the steel smelting process is used as a source of the water steam, so that the heat is recycled.
As a preferable scheme, the hot waste gas with the temperature of 100-150 ℃ is obtained from the hot waste gas of three cooling sections of the circular cooler.
As a preferable scheme, the 150-300 ℃ hot exhaust gas is from the hot exhaust gas of the cooling two-stage of the circular cooler. The invention realizes the recycling of the hot waste gas generated by cooling the sinter.
As a preferable scheme, the iron ore, biomass fuel, flux and return ore comprise the following components in percentage by mass: 63-70% of iron ore, 2-4% of biomass fuel, 8-10% of flux and 20-25% of return ore. The raw material composition formula is a common formula in the field, and only fossil fuel coke or coal dust and the like are replaced by biomass fuel.
Compared with the prior art, the technical scheme of the invention has the beneficial technical effects that:
(1) By adopting the method provided by the invention, the sintering material surface is divided into three areas, the area I is sprayed with the hydrogen-containing gas with higher concentration, the heat released by combustion of the area I can be utilized to quickly make up the defect of the heat of the upper material layer, the areas II and III are sprayed with the hydrogen-containing gas with lower concentration or not sprayed with the hydrogen-containing gas according to the heat supply requirement, and the balanced distribution of the heat of the whole material layer is realized by utilizing the latent heat in the hot waste gas, so that the high-quality sintering ore can be produced.
(2) The method provided by the invention is adopted, the combustible components in the multicomponent gas are combusted in the high temperature area at the upper part of the combustion zone and then are sprayed with water vapor and O 2 、N 2 Is composed of CO 2 、H 2 O(g)、O 2 、N 2 The specific heat capacity of the formed composite gas is larger than that of a pure air medium, so that the heat transfer front speed of the sinter bed is improved, and the matching property between the sinter bed and the combustion speed of biomass fuel is improved.
(3) The method provided by the invention sprays a certain proportion of water vapor into the area I, the area II and the area IIIGenerates water gas reaction with the incandescent solid carbon particles, promotes the combustion of the fuel particles, realizes the efficient release of the chemical energy of the solid fuel, and oxidizes CO generated in the combustion process to generate CO by generating high-activity OH free radicals 2 The method can further improve the combustion effect and reduce the emission concentration of CO in the sintering flue gas, and can solve the problem of high emission concentration of CO in the flue gas caused by high reactivity of biomass fuel to the greatest extent.
(4) According to the method provided by the invention, the hot waste gas is circulated back to the sintering material surface while the water vapor is sprayed into the region II and the region III, so that sensible heat in the hot waste gas is recycled, and the water vapor sprayed into the material surface is ensured to enter the solid biomass fuel combustion region of the middle-lower material layer in a gas state, and the combustion promoting effect of the solid biomass fuel combustion region is ensured.
(5) The method provided by the invention can realize that the hydrogen-containing fuel gas, clean renewable biomass fuel can completely replace solid fossil fuel, and can effectively control SOx, NOx, COx from the source of the combustion emission of the solid fossil fuel.
(6) The invention takes urban garden solid waste and agricultural waste straw as main sources of biomass fuel, which is beneficial to realizing the resource utilization of bulk solid waste; the method has the advantages that abundant self-produced low-pressure steam in the steel smelting flow is used as a source of water steam, hot waste gas generated by cooling the sinter is used as a source of hot air, and byproduct coke oven gas in the coke oven coking process is used as a hydrogen-containing gas source, so that the high-efficiency recycling of low-value byproducts in steel enterprises can be realized, and the method provided by the invention has obvious economic advantages.
Detailed Description
The present invention will be described more fully hereinafter with reference to the preferred embodiments for the purpose of facilitating understanding of the present invention, but the scope of protection of the present invention is not limited to the specific embodiments described below.
Unless defined otherwise, all technical and scientific terms used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the scope of the present invention.
The various reagents and materials used in the present invention are commercially available products or can be produced by known methods unless otherwise specified.
Example 1
Iron ore, wood charcoal, flux (quicklime, limestone, dolomite) and return ore are respectively prepared according to the mass percentages shown in table 1, wherein the characteristic parameters of the wood charcoal are shown in table 3, the mixture is distributed to a sintering trolley after mixing and granulating, ignition is carried out for 1min at the temperature of 1050+/-50 ℃, and then sintering is carried out under the condition of negative pressure of 14 kPa. The method comprises the steps of dividing the area from the end of ignition to the end of sintering in a sintering machine into an area I, an area II and an area III, wherein in the sintering process, the characteristic of spraying composite gas into the area I is 1.0% by volume of coke oven gas, 0.20% by volume of water vapor and the balance of air, the characteristic of spraying composite gas into the area II is 0.5% by volume of coke oven gas, 0.2% by volume of water vapor and the balance of hot air at 100 ℃, the characteristic of spraying composite gas into the area III is 0.2% by volume of water vapor and the balance of hot air at 150 ℃. The sintering yield and quality index are shown in table 4.
Example 2
Iron ore, wood charcoal, flux (quicklime, limestone, dolomite) and return ore are respectively prepared according to the mass percentages shown in table 1, wherein the characteristic parameters of the wood charcoal are shown in table 3, the mixture is distributed to a sintering trolley after mixing and granulating, ignition is carried out for 1min at the temperature of 1050+/-50 ℃, and then sintering is carried out under the condition of negative pressure of 14 kPa. The method comprises the steps of dividing the area from the end of ignition to the end of sintering in a sintering machine into an area I, an area II and an area III, wherein in the sintering process, the characteristic of spraying compound gas into the area I is 1.5% by volume of coke oven gas, 0.20% by volume of water vapor and the balance of air, the characteristic of spraying compound gas into the area II is 1.0% by volume of coke oven gas, 0.2% by volume of water vapor and the balance of hot air at 100 ℃, the characteristic of spraying compound gas into the area III is 0.2% by volume of water vapor and the balance of hot air at 150 ℃. The sintering yield and quality index are shown in table 4.
Example 3
Iron ore, wood charcoal, flux (quicklime, limestone, dolomite) and return ore are respectively prepared according to the mass percentages shown in table 1, wherein the characteristic parameters of the wood charcoal are shown in table 3, the mixture is distributed to a sintering trolley after mixing and granulating, ignition is carried out for 1min at the temperature of 1050+/-50 ℃, and then sintering is carried out under the condition of negative pressure of 14 kPa. The method comprises the steps of dividing the area from the end of ignition to the end of sintering in a sintering machine into an area I, an area II and an area III, wherein in the sintering process, the characteristic of spraying compound gas into the area I is 1.5% by volume of coke oven gas, 0.20% by volume of water vapor and the balance of air, the characteristic of spraying compound gas into the area II is 1.0% by volume of coke oven gas, 0.2% by volume of water vapor and the balance of hot air at 150 ℃, the characteristic of spraying compound gas into the area III is 0.2% by volume of water vapor and the balance of hot air at 250 ℃. The sintering yield and quality index are shown in table 4.
Comparative example 1 (conventional sintering)
Iron ore, coke powder, flux (quicklime, limestone, dolomite) and return ore are respectively prepared according to the mass percentages shown in table 2, after mixing and granulating, the mixture is distributed on a sintering trolley, ignition is carried out for 1min at the temperature of 1050+/-50 ℃, then sintering is carried out under the condition of negative pressure of 14kPa, and the sintering yield and quality indexes are shown in table 3.
Comparative example-2
Iron ore, wood charcoal, flux (quicklime, limestone, dolomite) and return ore are respectively prepared according to the mass percentages shown in table 1, wherein characteristic parameters of the wood charcoal are shown in table 3, the mixture is distributed to a sintering trolley after mixing and granulating, ignition is carried out for 1min at 1050+/-50 ℃, then sintering is carried out under the condition of negative pressure of 14kPa, and sintering yield, quality index and pollutant emission reduction index are shown in table 4. In the comparative example, wood charcoal is directly adopted to completely replace coke powder, the combustion activity of the wood charcoal is higher than that of the coke powder, the incomplete combustion proportion of the wood charcoal in a sintered material layer is high, the heat energy utilization rate is relatively low, and thus the obtained sintered yield and quality index are relatively poor.
Comparative example 3
Iron ore, wood charcoal, flux (quicklime, limestone, dolomite) and return ore are respectively prepared according to the mass percentages shown in table 1, wherein the characteristic parameters of the wood charcoal are shown in table 3, the mixture is distributed to a sintering trolley after mixing and granulating, ignition is carried out for 1min at the temperature of 1050+/-50 ℃, and then sintering is carried out under the condition of negative pressure of 14 kPa. The method comprises the steps of dividing the area from the end of ignition to the end of sintering of a sintering machine into an area I, an area II and an area III, spraying coke oven gas into the area I in the sintering process in a volume percentage of 1.0%, and spraying air into the area II in the rest of the area I in the sintering process in a volume percentage of 0.5% and air into the area III in the rest of the area III in the sintering process. The sintering yield and quality index are shown in table 4. According to the comparative example, the wood charcoal is adopted to completely replace coke powder, meanwhile, fuel gas is sprayed into different areas of a sintering material surface to make up for the heat demand of the material surface, but water vapor for promoting the efficient conversion of biomass heat energy and hot air for further optimizing the heat distribution of a material layer are not coupled, so that the sintering yield and quality index are relatively poor.
Comparative example 4
Iron ore, wood charcoal, flux (quicklime, limestone, dolomite) and return ore are respectively prepared according to the mass percentages shown in table 1, wherein the characteristic parameters of the wood charcoal are shown in table 3, the mixture is distributed to a sintering trolley after mixing and granulating, ignition is carried out for 1min at the temperature of 1050+/-50 ℃, and then sintering is carried out under the condition of negative pressure of 14 kPa. The method comprises the steps of dividing the area from the end of ignition to the end of sintering in a sintering machine into an area I, an area II and an area III, wherein in the sintering process, the characteristic of spraying composite gas into the area I is 1.0% by volume of coke oven gas, 0.20% by volume of water vapor and the balance of air, the characteristic of spraying composite gas into the area II is 0.5% by volume of coke oven gas, 0.2% by volume of water vapor and the balance of air, and the characteristic of spraying composite gas into the area III is 0.2% by volume of water vapor and the balance of air. The sintering yield and quality index are shown in table 4. According to the comparative example, the wood charcoal is adopted to completely replace coke powder, meanwhile, fuel gas is sprayed into different areas of a sintering material surface, the heat requirement of the material surface is made up, water vapor for promoting efficient conversion of biomass heat energy is introduced, but hot air in a thermal state of a material layer can be further optimized without coupling, so that sintering yield and quality indexes are relatively poor.
Comparative example 5
Iron ore, wood charcoal, flux (quicklime, limestone, dolomite) and return ore are respectively prepared according to the mass percentages shown in table 1, wherein the characteristic parameters of the wood charcoal are shown in table 3, the mixture is distributed to a sintering trolley after mixing and granulating, ignition is carried out for 1min at the temperature of 1050+/-50 ℃, and then sintering is carried out under the condition of negative pressure of 14 kPa. The method comprises the steps of dividing the area from the end of ignition to the end of sintering in a sintering machine into an area I, an area II and an area III, wherein the characteristic of the injection of composite gas into the area I in the sintering process is 0.20% of the volume percentage of water vapor, the balance of air, the characteristic of the injection of composite gas into the area II is 0.2% of the volume percentage of water vapor, the balance of hot air at 100 ℃, the characteristic of the injection of composite gas into the area III is 0.2% of the volume percentage of water vapor, and the balance of hot air at 150 ℃. The sintering yield and quality index are shown in table 4. According to the comparative example, wood charcoal is adopted to completely replace coke powder, water vapor for promoting efficient conversion of biomass heat energy is introduced into a sintering material surface, hot air capable of further optimizing the thermal state of a material layer is coupled, but fuel gas which is not blown into the material surface and can make up for insufficient heat of a material layer at the upper part is not blown, so that sintering yield and quality indexes are relatively poor.
TABLE 1 sintering raw material mass percent of solid-free fossil fuel
| Sintering material | Mass percent/% |
| Iron ore | 65.7 |
| Wooden charcoal | 3.0 |
| Quicklime | 4.0 |
| Limestone powder | 2.2 |
| Dolomite (Dolomite) | 2.8 |
| Return mine | 22.3 |
| Totals to | 100.00 |
Table 2 weight percent of sintering material using solid fossil fuel
TABLE 3 characterization parameters of wood charcoal
| Heating value | Volatile component | Porosity of the porous material | Specific surface area | >5mm/％ | 3～5mm/％ | <3mm |
| 27.5 | 2.6 | 24.5 | 21.3 | 10.0 | 72.4 | 17.6 |
TABLE 4 sinter yield, quality index
| Example | Yield/% | Drum strength/% | Coefficient of utilization/(t.m) -2 ·h -1 ) |
| Example-1 | 76.10 | 64.68 | 1.47 |
| Example-2 | 76.80 | 65.07 | 1.51 |
| Example-3 | 77.15 | 65.30 | 1.54 |
| Comparative example-1 (conventional sintering) | 75.80 | 64.60 | 1.45 |
| Comparative example 2 | 70.30 | 60.07 | 1.20 |
| Comparative example 3 | 72.07 | 62.60 | 1.31 |
| Comparative example 4 | 73.50 | 63.05 | 1.36 |
| Comparative example 5 | 71.60 | 61.73 | 1.27 |
Claims (6)
1. A sintering method of solid-free fossil fuel based on multi-component gas medium and waste biomass coupling heat supply is characterized by comprising the following steps: mixing and granulating raw materials including iron ore, biomass fuel, flux and return ore, distributing the obtained granules, and then feeding the granules into a sintering machine for ignition and sintering; the sintering material surface in the sintering machine is divided into three independent sealing areas, namely an area I, an area II and an area III, from the end of ignition to the end of sintering, a multi-component gas medium is led into the three sealing areas, and the concentration of hydrogen-containing gas in the multi-component gas medium sprayed into the areas I, II and III is decreased, the content of water vapor is increased and the temperature of oxygen-containing gas is increased; the heat value of the biomass fuel is 25-30 MJ/kg, the volatile content is 2-4%, the porosity is 20-30%, and the specific surface area is 17-26 m 2 The mass percentage content of particles with the diameter of more than 5mm is not more than 15 percent, and the mass percentage content of particles with the diameter of less than 3mm is not more than 20 percent;
the content of hydrogen-containing gas in the multi-component gas medium sprayed in the area I is 1.0-2.7vol%, the content of water vapor is 0-0.3vol%, and the balance is normal-temperature air;
the content of hydrogen-containing gas in the multicomponent gas medium sprayed in the region II is 0.5-1.5vol%, the content of water vapor is 0.1-0.4vol%, and the balance is 100-150 o C, hot exhaust gas;
the content of hydrogen-containing gas in the multicomponent gas medium sprayed in the region III is 0vol%, the content of water vapor is 0.3-0.6%, and the balance is 150-300 o And C, hot exhaust gas.
2. The method for sintering solid-free fossil fuel based on multi-component gaseous medium and waste biomass coupled heat supply according to claim 1, wherein: the biomass fuel comprises at least one of forestry processing waste pyrolytic carbon, densely formed agricultural waste pyrolytic carbon, kernel carbon and shell carbon.
3. The method for sintering solid-free fossil fuel based on multi-component gaseous medium and waste biomass coupled heat supply according to claim 1, wherein:
the hydrogen-containing fuel gas comprises at least one of coke oven gas, natural gas, hydrogen and biomass pyrolysis gas;
the water vapor is low-pressure water vapor produced by a steel plant, the pressure P is less than or equal to 2.5MPa, and the temperature T is less than or equal to 400 o C。
4. The method for sintering solid-free fossil fuel based on multi-component gaseous medium and waste biomass coupled heat supply according to claim 1, wherein: the range of 100 to 150 o The C hot exhaust gas comes from the hot exhaust gas of the cooling three sections of the circular cooler.
5. The method for sintering solid-free fossil fuel based on multi-component gaseous medium and waste biomass coupled heat supply according to claim 1, wherein: the range of 150 to 300 o The C hot exhaust gas comes from the hot exhaust gas of the cooling two-stage of the circular cooler.
6. The method for sintering solid-free fossil fuel based on multi-component gaseous medium and waste biomass coupled heat supply according to claim 1, wherein: the iron ore, biomass fuel, flux and return ore comprise the following components in percentage by mass: 63-70% of iron ore, 2-4% of biomass fuel, 8-10% of flux and 20-25% of return ore.
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