A low-carbon thick material layer sintering method and sintering machine based on comprehensive blowing

Abstract

The present invention discloses a low-carbon thick-bed sintering method and a sintering machine based on comprehensive injection, the sintering method comprising: carrying out thick-bed sintering by means of two-time material distribution and two-time ignition; carrying out a first injection on the sintering material surface after the first ignition, and carrying out a second injection on the sintering material surface after the second ignition; the injection uses a mixture of gas and steam; determining the total heat of the first injection, the total heat of the second injection and the corresponding heat supply ratio of the gas and the steam according to the maximum temperature of the sintering material layer and the proportion of biomass carbon powder in the sintering fuel; solving the problem that non-fossil biomass fuels cannot be used in sintering production on a large scale; and solving the problem that the key technical parameters such as the amount of gas fuel added, the mixing ratio and the injection position of the mixed injection of hydrogen-rich gas and steam in the sintering of ultra-thick layers are difficult to control, which affects the actual injection effect, thereby realizing high-quality and low-emission sintering production.

Description

Technical Field

[0001] The invention relates to the field of ironmaking production, specifically to a sintering production technology, and in particular to a low-carbon thick material layer sintering method. Background Art

[0002] Sintering technology is a key link in the ironmaking process. Its principle is to mix various powdered iron-containing raw materials with appropriate amount of fuel and flux, add appropriate amount of water, mix and pelletize, and then sinter the materials into blocks through a series of physical and chemical changes on the sintering equipment, and then send them to the blast furnace for the next step. Thick bed sintering is an important sintering technology, which has the advantages of improving the strength of sintered ore and reducing sintering fuel consumption, but the application of thick bed sintering technology also faces some difficulties.

[0003] When thick material layers are sintered, the "automatic heat storage" phenomenon of the sintering material layer is serious. The fuel is added in one mixing, which makes the upper part of the sintering material layer relatively insufficient in heat, resulting in insufficient agglomeration strength of the upper part of the sintering material layer. Because the combustion zone gradually moves downward, the upper sintering ore layer is continuously cooled by cold air, and the heat of the material layer on the surface of the trolley is quickly lost. Due to the heat transfer and automatic heat storage, the lower sintering material layer has excess heat, resulting in over-melting of the material layer. If the carbon content is reduced, the upper sintering ore layer will produce more raw materials and sintering return ore, which will have an adverse effect on the quality of the sintered ore. Domestic and foreign studies have shown that: (1) Reducing the amount of return ore by 1.5% to 3% can reduce the sintering solid fuel consumption by 0.6kg / ts; (2) The insufficient strength of the sintered ore will produce powder during transportation and transfer. For every 1% increase in powder less than 5mm, the blast furnace fuel ratio will increase by 0.5% and the output will decrease by 0.5% to 1%; (3) A 10% decrease in the indirect reduction degree of the sintered ore entering the furnace will affect the blast furnace fuel ratio and output by 8% to 9% respectively. Low-carbon, high-quality sintering is the most ideal means of sintering energy conservation and emission reduction, and it is also of great significance to the clean production of the steel industry.

[0004] Gas injection enhanced sintering technology is a relatively advanced green sintering transformation process at this stage. This technology replaces part of the sintering coke powder by injecting gas diluted to below the combustion concentration onto the surface of the sintering material layer after the ignition stage, so that part of the fuel enters the sintering material layer from the top and burns near the upper part of the combustion zone. JFE Steel Corporation and Kyushu University have cooperated to develop the technology of injecting liquefied natural gas fuel onto the material surface of the sintering machine, and put it into commercial operation in Keihin No. 1 sintering machine, achieving a good effect of reducing solid fuel consumption by 3kg / ts, increasing drum strength by 1%, RI by 4%, and CO2 emission reduction of up to about 60,000t / year. Studies have shown that natural gas enters the sintering material layer through the material surface and starts to burn above the combustion zone, which can effectively widen the high-temperature melting zone, increase the high-temperature retention time, avoid excessive cooling rate of the upper sintering ore zone, and improve sintering mineralization conditions. While reducing the solid fuel, the maximum temperature of the lower material layer is reduced, which improves the density of the unmelted iron ore and improves the reducibility. It is an effective means to truly achieve low-carbon homogeneous sintering and improve the overall quality indicators of sintered ore. Shaoguan Iron and Steel Company of my country injects the surplus coke oven gas in the steel plant into the sintering material surface, and the mechanical strength and metallurgical properties of the sintered ore are effectively improved.

[0005] Due to the differences in sintering equipment, raw material types, and sintering process parameters such as alkalinity, negative pressure, material layer height and solid fuel ratio, in the thick material layer sintering hydrogen-rich gas and steam mixed injection technology, there are problems such as gas fuel addition amount, mixing ratio and injection position that are difficult to control, affecting the actual injection effect; and non-fossil biomass fuels cannot be used in large proportions in sintering production, which in turn affects high-quality and low-emission sintering production.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may contain information that does not constitute prior art. Summary of the invention

[0007] In view of this, the present invention provides a low-carbon thick layer sintering method based on comprehensive injection, which solves the problem that key technical parameters such as gas fuel addition amount, mixing ratio and injection position are difficult to control in the mixed injection of hydrogen-rich gas and steam in ultra-thick layer sintering, affecting the actual injection effect, and the problem that non-fossil biomass fuels cannot be used in sintering production on a large scale; thereby achieving high-quality, low-emission sintering production.

[0008] In a first aspect, the low-carbon thick layer sintering method based on comprehensive blowing comprises:

[0009] The thick layer sintering is carried out by using the method of two-time material distribution and two-time ignition;

[0010] The first blowing is performed on the sintered material surface after the first ignition, and the second blowing is performed on the sintered material surface after the second ignition;

[0011] The spraying uses a mixture of fuel gas and steam;

[0012] The total heat of the first injection, the total heat of the second injection and the corresponding heat supply ratio of the gas and the steam are determined according to the maximum temperature of the sintering material layer and the proportion of biomass carbon powder in the sintering fuel.

[0013] In the present disclosure and possible embodiments, the method for determining the total heat of the first injection and the mixing ratio of the gas and the steam includes:

[0014] When the mass fraction of the biomass carbon powder in the sintering fuel is 60% to 70% and the maximum temperature of the sintering material layer is 1230°C to 1255°C, the heat of the first injection is 10% to 15% of the total heat of the sintering material mineralization; the heat supplied by the gas accounts for 80% to 85% of the heat of the first injection, and the heat supplied by the steam accounts for 15% to 20% of the heat of the first injection;

[0015] When the mass fraction of the biomass carbon powder in the sintering fuel is 60% to 70% and the maximum temperature of the sintering material layer is 1256°C to 1285°C, the heat of the first injection is 10% to 15% of the total heat of the sintering material mineralization; the heat supplied by the gas accounts for 75% to 80% of the heat of the first injection, and the heat supplied by the steam accounts for 20% to 25% of the heat of the first injection;

[0016] When the mass fraction of the biomass carbon powder in the sintering fuel is 71% to 80% and the maximum temperature of the sintering material layer is 1230°C to 1250°C, the heat of the first injection is 15% to 20% of the total heat of the sintering material mineralization; the heat supplied by the gas accounts for 90% to 95% of the heat of the first injection, and the heat supplied by the steam accounts for 5% to 10% of the heat of the first injection;

[0017] When the mass fraction of the biomass carbon powder in the sintering fuel is 71% to 80% and the maximum temperature of the sintering material layer is 1251°C to 1285°C, the heat of the first injection is 15% to 20% of the total heat of the sintering material mineralization; the heat supplied by the gas accounts for 85% to 90% of the heat of the first injection, and the heat supplied by the steam accounts for 10% to 15% of the heat of the first injection.

[0018] In the present disclosure and possible embodiments, the method for determining the total heat of the second injection and the mixing ratio of the fuel gas and the steam includes:

[0019] When the mass fraction of the biomass carbon powder in the sintering fuel is 60% to 70% and the maximum temperature of the sintering material layer is 1230°C to 1255°C, the heat of the second injection is 5% to 10% of the total heat of the sintering material mineralization; the heat supplied by the gas accounts for 70% to 75% of the heat of the second injection, and the heat supplied by the steam accounts for 25% to 30% of the heat of the second injection;

[0020] When the mass fraction of the biomass carbon powder in the sintering fuel is 60% to 70% and the maximum temperature of the sintering material layer is 1256°C to 1285°C, the heat of the second injection is 5% to 10% of the total heat of the sintering material mineralization; the heat supplied by the gas accounts for 65% to 70% of the heat of the second injection, and the heat supplied by the steam accounts for 30% to 35% of the heat of the second injection;

[0021] When the mass fraction of the biomass carbon powder in the sintering fuel is 71% to 80% and the maximum temperature of the sintering material layer is 1230°C to 1250°C, the heat of the second injection is 10% to 15% of the total heat of the sintering material mineralization; the heat supplied by the gas accounts for 85% to 90% of the heat of the second injection, and the heat supplied by the steam accounts for 10% to 15% of the heat of the second injection;

[0022] When the mass fraction of the biomass carbon powder in the sintering fuel is 71% to 80% and the maximum temperature of the sintering material layer is 1251°C to 1285°C, the heat of the second injection is 10% to 15% of the total heat of the sintering material mineralization; the heat supplied by the gas accounts for 80% to 85% of the heat of the second injection, and the heat supplied by the steam accounts for 15% to 20% of the heat of the second injection.

[0023] In the present disclosure and possible embodiments, the first blowing area is the sintering material surface 10 to 20 m along the running direction of the trolley starting from the first igniter;

[0024] The second blowing area is the sintering material surface 5 to 15 m from the second igniter along the running direction of the trolley.

[0025] In the present disclosure and possible embodiments, the thickness of the lower layer of sintering material laid in the first of the two times is 1 / 2 to 2 / 3 of the total thickness of the material layer; after being ignited by the first igniter, the lower layer of sintering material begins to be sintered by exhaust air;

[0026] When the sintering trolley runs to 1 / 4 to 1 / 3 of the total length of the sintering machine, the second distribution of materials is carried out on the surface of the sintered ore being sintered; the thickness of the upper layer of sintering materials distributed for the second time is 1 / 3 to 1 / 2 of the total thickness of the material layer; after the second igniter is ignited, the upper layer of sintering materials begins to be sintered by exhaust air;

[0027] When the thick material layer is sintered, the upper sintering material and the lower sintering material are made to reach the sintering end point at the same time by adjusting the exhaust negative pressure.

[0028] In the present disclosure and possible embodiments, the fuel gas is hydrogen-rich fuel gas, and the hydrogen-rich fuel gas is at least one of coke oven gas, natural gas and hydrogen;

[0029] The sintering fuel is composed of the biomass carbon powder and coke powder, the mass fraction of the biomass carbon powder is 60% to 80%, and the mass fraction of the coke powder is 20% to 40%;

[0030] The steam is medium-temperature and medium-pressure steam generated by the waste heat boiler of the ring cooler, with a temperature of 260°C to 320°C and a pressure of 0.6 to 1Mpa.

[0031] In the present disclosure and possible embodiments, the total thickness of the material layer is 900 mm to 1200 mm; the maximum temperature of the sintering material layer is controlled to be 1230 to 1285°C.

[0032] In the present disclosure and possible embodiments, the injection depth of the hydrogen-rich fuel gas is 300-500 mm, and the injection depth of the steam is 200-400 mm.

[0033] In a second aspect, a sintering machine for the sintering method of the first aspect comprises:

[0034] A first material distribution device, a first igniter, a second material distribution device and a second igniter;

[0035] The first material distribution device and the first igniter are located at the head of the sintering machine, the second material distribution device and the second igniter are located in the middle of the sintering machine, and the distance between the first igniter and the second material distribution device is 1 / 4 to 1 / 3 of the total length of the sintering machine.

[0036] In the present disclosure and possible embodiments, a first blowing hood and a second blowing hood are sequentially arranged above the sintering trolley along the trolley running direction; the length of the first blowing hood is 10 to 20 m, and the length of the second blowing hood is 5 to 15 m.

[0037] In the present disclosure and possible embodiments, the first blowing hood and the second blowing hood are connected to a steam injection device and a hydrogen-rich fuel gas injector, respectively.

[0038] In the present disclosure and possible embodiments, the first blowing hood and the second blowing hood are provided with telescopic joints; the telescopic joints are used to adjust the distance from the gas blowing hood to the sintering material surface; the comprehensive blowing parameters of the first and second blowing hoods are independently adjustable.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. The present invention combines the gas-steam comprehensive injection process with the thick material layer sintering process, creatively designs a method for adjusting the mixing ratio of gas and steam according to the mineralization law of the sintering material layer, determines the position and injection amount of the first and second injections, and solves the problem that key technical parameters such as the gas fuel addition amount, mixing ratio and injection position are difficult to control in the comprehensive injection technology of hydrogen-rich gas and steam for thick material layer sintering, thereby greatly improving the actual effect of the comprehensive injection.

[0041] 2. The present invention combines gas injection and steam injection sintering, and couples the strengthening effect of hydrogen-rich gas and steam on the sintering ore mineralization process, so that the comprehensive injection effect is significantly enhanced, the metallurgical properties of the sintered ore are improved, and the problem of sintered ore quality deterioration caused by the large-scale addition of biomass carbon powder in sintering production is solved. Non-fossil biomass carbon powder can be used in a large proportion in sintering production to achieve high-quality and low-carbon sintering production.

[0042] 3. The present invention combines the comprehensive injection process with the thick layer sintering process, creatively designs the positions of the first and second igniters, the first and second injection areas and injection amounts, and the injection depths of the hydrogen-rich gas and steam, thereby solving the problems of low strength of the surface sintered ore and poor reducibility of the bottom sintered ore caused by "automatic heat storage" in thick layer sintering, achieving a reasonable distribution of heat in the sintering layer and reducing sintering solid fuel consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0044] Figure 1 is a schematic structural diagram of a sintering machine according to Embodiment 1 of the present disclosure;

[0045] In the figure: 1 first material distribution device; 2 first igniter; 3 first blowing hood; 4 second material distribution device; 5 second igniter; 6 steam injection device; 7 second blowing hood; 8 sintering trolley; 9 gas pipeline; 10 exhaust system; 11 sintering flue gas main pipeline; 12 unloading and crushing device; 13 expansion joint; 14 gas switch regulating valve; 15, hydrogen-rich gas injector. DETAILED DESCRIPTION

[0046] The present disclosure is described below based on embodiments, but it is worth noting that the present disclosure is not limited to these embodiments. In the detailed description of the present disclosure below, some specific details are described in detail. However, for the parts that are not described in detail, those skilled in the art can also fully understand the present disclosure.

[0047] At the same time, unless the context clearly requires otherwise, the words "include", "comprises" and similar words throughout the specification and claims should be interpreted as inclusive rather than exclusive or exhaustive; that is, the meaning is "including but not limited to".

[0048] Example 1

[0049] Figure 1 is a schematic diagram of the structure of the sintering machine in Example 1 of the present disclosure; Figure 1 As shown: the sintering machine includes a sintering trolley 8, an exhaust system 10, a material distribution device, a discharge and crushing device 12, and an igniter. The exhaust system 10 is arranged below the entire sintering area of ​​the sintering machine. The exhaust system 10 is connected to the sintering fume main pipeline 11. The material distribution device and the igniter are respectively in two sets.

[0050] Among them, the first distribution device 1 and the first igniter 2 are located at the head of the sintering machine, and the second distribution device 4 and the second igniter 5 are located in the middle of the sintering machine; according to the heat distribution of the sintering material layer and the mineralization reaction process, the distance between the first igniter 2 and the second distribution device 4 is set to 1 / 4 to 1 / 3 of the total length of the sintering machine to solve the imbalance of heat distribution between the upper and lower material layers and improve the permeability of the sintering material layer.

[0051] A first gas blowing hood 3 is provided above the sintering trolley along the running direction of the trolley starting from the first igniter 2, and the length of the first gas blowing hood 3 is 10 to 20 meters; a second gas blowing hood 7 is provided above the sintering trolley along the running direction of the trolley starting from the second igniter 5, and the length of the second gas blowing hood 7 is 5 to 15 meters; the two blowing hoods transport gas through a gas pipeline 9, and a gas switch regulating valve 14 is provided on the gas pipeline.

[0052] The first gas injection hood 3 and the second gas injection hood 7 are provided with a steam injection device 6 and a hydrogen-rich gas injector 15. The comprehensive injection parameters of the first gas injection hood 3 and the second gas injection hood 7 are independently adjustable.

[0053] The first gas blowing hood 3 and the second gas blowing hood 7 are provided with telescopic joints 13, through which the distance between the gas blowing hood and the sintering material surface can be adjusted.

[0054] Example 2

[0055] The sintering machine of Example 1 of the present disclosure is applied to implement a low-carbon thick layer sintering method based on comprehensive injection, wherein the distance between the first igniter 2 and the second material distribution device 4 of the sintering machine is 1 / 4 of the total length of the sintering machine, the length of the first gas blowing hood 3 is 11m, and the length of the second gas blowing hood 7 is 8m.

[0056] The sintering material firstly added to the trolley is the lower layer sintering material, and its thickness is 1 / 2 of the total thickness of the material layer; the mass fraction of biomass carbon powder in the lower layer sintering fuel is 65%, and the mass fraction of coke powder is 35%.

[0057] The first igniter 2 ignites, and the lower layer of sintering material begins to be sintered by exhaust air; the sintering material surface 11m from the first igniter 2 along the running direction of the trolley is set as the first blowing zone. A mixture of hydrogen-rich fuel gas and steam is sprayed into the material layer in the first blowing zone for the first time; the heat supplied by the first blowing accounts for 12% of the total heat of the ore formation of the sintering material, and the corresponding maximum temperature of the material layer is 1245℃.

[0058] Adjust the comprehensive injection process parameters, the heat supplied by hydrogen-rich gas accounts for 82% of the total heat of the first injection, and the heat supplied by steam accounts for 18% of the total heat of the first injection, of which the hydrogen-rich gas is coke oven gas, and the steam is the medium-temperature medium-pressure steam generated by the waste heat boiler of the ring cooler, with a temperature of 270°C and a pressure of 0.7Mpa. The injection depth of hydrogen-rich gas is 400mm, and the steam injection depth is 300mm.

[0059] When the sintering trolley runs to 1 / 4 of the total length of the sintering machine, a layer of sintering material is added to the surface of the sintered ore being sintered. The thickness of the upper layer of sintering material is 1 / 2 of the total thickness of the material layer; the mass fraction of biomass carbon powder in the upper layer of sintering fuel is 75%, and the mass fraction of coke powder is 25%.

[0060] After ignition by the second igniter 5, the upper layer of sintering material begins to be sintered by exhaust air; the sintering material surface 8m from the second igniter 5 along the running direction of the trolley is set as the second blowing zone.

[0061] A mixture of hydrogen-rich fuel gas and steam is sprayed into the material layer in the second spraying zone for the second spraying; the heat supplied by the second spraying accounts for 10% of the total heat of sintering material mineralization, and the corresponding maximum temperature of the material layer is 1265°C.

[0062] Adjust the comprehensive injection process parameters, the heat supplied by hydrogen-rich gas accounts for 85% of the total heat of the second injection, and the heat supplied by steam accounts for 15% of the total heat of the second injection, of which the hydrogen-rich gas is natural gas, and the steam is the medium-temperature medium-pressure steam generated by the waste heat boiler of the annular cooler, with a temperature of 300°C and a pressure of 0.9Mpa. The total thickness of the upper and lower sintering materials is 1000mm.

[0063] By comparison with the single-layer non-injection full coke powder sintering process, after sintering by the method of Example 2, the thickness of the sintering material layer is increased from 750 mm to 1000 mm, and the sintering utilization coefficient is increased from 1.325 t / h.m2 to 1.621 t / h.m2; the sintering solid fuel consumption is reduced from 45 kg / t to 36 kg / t; the sintering drum strength is increased from 80.5% to 86.1%, and the reducibility is increased from 79.5% to 87.2%; and the sintering flue gas COx, SOx and NOx emissions are reduced by 12.5%, 13.8% and 14.7%, respectively.

[0064] Example 3

[0065] The sintering machine of Example 1 of the present disclosure is applied to implement a low-carbon thick layer sintering method based on comprehensive injection, wherein the distance between the first igniter 2 and the second material distribution device 4 of the sintering machine is 1 / 3 of the total length of the sintering machine, the length of the first gas blowing hood 3 is 17m, and the length of the second gas blowing hood 7 is 13m.

[0066] The first sintering material added to the trolley is the lower layer sintering material, and its thickness is 2 / 3 of the total thickness of the material layer; the mass fraction of biomass carbon powder in the lower layer sintering fuel is 75%, and the mass fraction of coke powder is 25%. The lower layer sintering material begins to be sintered by exhaust after ignition by the first igniter 2; the sintering material surface 17m from the first igniter 2 along the trolley running direction is set as the first injection zone. A mixture of hydrogen-rich fuel gas and steam is injected into the material layer of the first injection zone for the first injection; the heat supplied by the first injection accounts for 17% of the total heat of ore formation of the sintering material, and the corresponding maximum temperature of the material layer is 1240℃.

[0067] The comprehensive injection process parameters are adjusted, the heat supplied by the hydrogen-rich gas accounts for 92% of the total heat of the first injection, and the heat supplied by the steam accounts for 8% of the total heat of the first injection. The hydrogen-rich gas is a mixture of coke oven gas and natural gas, in which the coke oven gas accounts for 60% of the total hydrogen-rich gas and the natural gas accounts for 40% of the total hydrogen-rich gas. The steam is the medium-temperature and medium-pressure steam generated by the waste heat boiler of the ring cooler, with a temperature of 300°C and a pressure of 0.8Mpa. The injection depth of the hydrogen-rich gas is 420mm, and the steam injection depth is 350mm.

[0068] When the sintering trolley runs to 1 / 3 of the total length of the sintering machine, a layer of sintering material is added to the surface of the sintered ore being sintered. The thickness of the upper layer of sintering material is 1 / 3 of the total thickness of the material layer; the mass fraction of biomass carbon powder in the upper layer of sintering fuel is 70%, and the mass fraction of coke powder is 30%.

[0069] After ignition by the second igniter 5, the upper layer of sintering material begins to be sintered by exhaust air; the sintering material surface 13m from the second igniter 5 along the running direction of the trolley is set as the second blowing zone.

[0070] A mixture of hydrogen-rich fuel gas and steam is sprayed into the material layer in the second spraying zone for the second spraying; the heat supplied by the second spraying accounts for 10% of the total heat of sintering material mineralization, and the corresponding maximum temperature of the material layer is 1275°C.

[0071] Adjust the comprehensive injection process parameters, the heat supplied by hydrogen-rich gas accounts for 67% of the total heat of the second injection, and the heat supplied by steam accounts for 33% of the total heat of the second injection, of which the hydrogen-rich gas is a mixture of natural gas and hydrogen, with natural gas accounting for 80% of the total hydrogen-rich gas and hydrogen accounting for 20% of the total hydrogen-rich gas; the steam is the medium-temperature medium-pressure steam generated by the waste heat boiler of the annular cooler, with a temperature of 270°C and a pressure of 0.8Mpa. The total thickness of the upper and lower sintering materials is 1200mm.

[0072] By comparison with the single-layer non-injection full coke powder sintering process, after sintering by the method of Example 3, the thickness of the sintering material layer is increased from 800 mm to 1200 mm, and the sintering utilization coefficient is increased from 1.345 t / h.m2 to 1.663 t / h.m2; the sintering solid fuel consumption is reduced from 46 kg / t to 37.5 kg / t; the sintering drum strength is increased from 79.5% to 85.9%, and the reducibility is increased from 80.9% to 86.8%; and the sintering flue gas COx, SOx and NOx emissions are reduced by 13.4%, 14.9% and 15.6%, respectively.

[0073] The above-described embodiments are only embodiments of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the present disclosure. It should be noted that, for a person of ordinary skill in the art, without departing from the concept of the present disclosure, several variations, equivalent substitutions, improvements, etc. may be made, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure shall be subject to the attached claims.

Claims

1. A low-carbon thick layer sintering method based on comprehensive blowing, characterized in that: include: The thick layer sintering is carried out by using the method of two-time material distribution and two-time ignition; The first blowing is performed on the sintered material surface after the first ignition, and the second blowing is performed on the sintered material surface after the second ignition; The spraying uses a mixture of fuel gas and steam; Determine the total heat of the first injection, the total heat of the second injection and the corresponding heat supply ratio of the gas and the steam according to the maximum temperature of the sintering material layer and the proportion of biomass carbon powder in the sintering fuel; The method for determining the total heat of the first injection and the mixing ratio of the fuel gas and the steam includes: When the mass fraction of the biomass carbon powder in the sintering fuel is 60% to 70% and the maximum temperature of the sintering material layer is 1230°C to 1255°C, the heat of the first injection is 10% to 15% of the total heat of the sintering material mineralization; the heat supplied by the gas accounts for 80% to 85% of the heat of the first injection, and the heat supplied by the steam accounts for 15% to 20% of the heat of the first injection; When the mass fraction of the biomass carbon powder in the sintering fuel is 60% to 70% and the maximum temperature of the sintering material layer is 1256°C to 1285°C, the heat of the first injection is 10% to 15% of the total heat of the sintering material mineralization; the heat supplied by the gas accounts for 75% to 80% of the heat of the first injection, and the heat supplied by the steam accounts for 20% to 25% of the heat of the first injection; When the mass fraction of the biomass carbon powder in the sintering fuel is 71% to 80% and the maximum temperature of the sintering material layer is 1230°C to 1250°C, the heat of the first injection is 15% to 20% of the total heat of the sintering material mineralization; the heat supplied by the gas accounts for 90% to 95% of the heat of the first injection, and the heat supplied by the steam accounts for 5% to 10% of the heat of the first injection; When the mass fraction of the biomass carbon powder in the sintering fuel is 71% to 80% and the maximum temperature of the sintering material layer is 1251°C to 1285°C, the heat of the first injection is 15% to 20% of the total heat of the sintering material mineralization; the heat supplied by the gas accounts for 85% to 90% of the heat of the first injection, and the heat supplied by the steam accounts for 10% to 15% of the heat of the first injection; The method for determining the total heat of the second injection and the mixing ratio of the fuel gas and the steam includes: When the mass fraction of the biomass carbon powder in the sintering fuel is 60% to 70% and the maximum temperature of the sintering material layer is 1230°C to 1255°C, the heat of the second injection is 5% to 10% of the total heat of the sintering material mineralization; the heat supplied by the gas accounts for 70% to 75% of the heat of the second injection, and the heat supplied by the steam accounts for 25% to 30% of the heat of the second injection; When the mass fraction of the biomass carbon powder in the sintering fuel is 60% to 70% and the maximum temperature of the sintering material layer is 1256°C to 1285°C, the heat of the second injection is 5% to 10% of the total heat of the sintering material mineralization; the heat supplied by the gas accounts for 65% to 70% of the heat of the second injection, and the heat supplied by the steam accounts for 30% to 35% of the heat of the second injection; When the mass fraction of the biomass carbon powder in the sintering fuel is 71% to 80% and the maximum temperature of the sintering material layer is 1230°C to 1250°C, the heat of the second injection is 10% to 15% of the total heat of the sintering material mineralization; the heat supplied by the gas accounts for 85% to 90% of the heat of the second injection, and the heat supplied by the steam accounts for 10% to 15% of the heat of the second injection; When the mass fraction of the biomass carbon powder in the sintering fuel is 71% to 80% and the maximum temperature of the sintering material layer is 1251°C to 1285°C, the heat of the second injection is 10% to 15% of the total heat of the sintering material mineralization; the heat supplied by the gas accounts for 80% to 85% of the heat of the second injection, and the heat supplied by the steam accounts for 15% to 20% of the heat of the second injection.

2. The low-carbon thick layer sintering method based on comprehensive blowing according to claim 1 is characterized in that: The first blowing area is the sintering material surface 10 to 20 meters along the running direction of the trolley starting from the first igniter; The second blowing area is the sintering material surface 5 to 15 m from the second igniter along the running direction of the trolley.

3. The low-carbon thick layer sintering method based on comprehensive blowing according to claim 2 is characterized in that: The thickness of the lower sintering material layer laid in the first of the two times is 1 / 2 to 2 / 3 of the total thickness of the material layer; After being ignited by the first igniter, the lower layer of sintering material begins to be sintered by exhaust air; When the sintering trolley runs to 1 / 4 to 1 / 3 of the total length of the sintering machine, the second distribution is carried out on the surface of the sintered ore being sintered; The thickness of the second top layer of sintering material is 1 / 3 to 1 / 2 of the total thickness of the material layer; After being ignited by the second igniter, the upper layer of sintering material begins to be sintered by exhaust air; When the thick material layer is sintered, the upper sintering material and the lower sintering material are made to reach the sintering end point at the same time by adjusting the exhaust negative pressure.

4. The low-carbon thick layer sintering method based on comprehensive blowing according to claim 3 is characterized in that: The fuel gas is hydrogen-rich fuel gas, and the hydrogen-rich fuel gas is at least one of coke oven gas, natural gas and hydrogen; The sintering fuel is composed of the biomass carbon powder and coke powder, the mass fraction of the biomass carbon powder is 60% to 80%, and the mass fraction of the coke powder is 20% to 40%; The steam is medium-temperature and medium-pressure steam generated by the waste heat boiler of the ring cooler, with a temperature of 260°C to 320°C and a pressure of 0.6 to 1Mpa.

5. The low-carbon thick layer sintering method based on comprehensive blowing according to claim 4 is characterized in that: The total thickness of the material layer is 900 mm to 1200 mm; the maximum temperature of the sintering material layer is controlled to be 1230 to 1285°C.

6. The low-carbon thick layer sintering method based on comprehensive blowing according to claim 4 or 5, characterized in that: The injection depth of the hydrogen-rich fuel gas is 300-500 mm, and the injection depth of the steam is 200-400 mm.

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