Device and method for sintering by using hot air of blast furnace

Abstract

The invention relates to a device and method for sintering through blast furnace hot air. The device comprises a sintering cup body, a crusher, a sintering cup platform, a lifting mechanism, a rotating mechanism, a hot air inlet cylinder, a hot air inlet pipeline and a turnover mechanism. The sintering cup body is vertically arranged in the middle of the sintering cup platform; the sintering cup body is connected with the sintering cup platform through a turnover mechanism; the crusher is arranged right in front of the sintering cup body; the hot air inlet cylinder is vertically arranged above the rear side of the sintering cup body; the lifting mechanism is vertically arranged on the rear side of the sintering cup body; the bottom of the hot air inlet cylinder is connected with a lifting mechanism through a rotating mechanism; the top of the hot air inlet cylinder is connected with a hot air pipeline of the blast furnace hot blast stove through a hot air inlet pipeline. The process of the method comprises the following steps: raw material preparation, water addition, primary mixing, secondary mixing, material distribution, sintering, crushing, falling, size grading and drum and index detection. Fuel consumption in the sintering process can be reduced, the reaction speed in the sintering process is increased, pollutant emission is reduced, and the method is more environmentally friendly.

Description

Technical Field

[0001] The invention relates to the technical field of iron and steel metallurgy, and in particular to a device and method for sintering using blast furnace hot air. Background Art

[0002] In the steel industry, blast furnace ironmaking is an important production link, and high-quality sintered ore is essential for the stable operation and efficient production of blast furnaces. Traditional sintering experimental methods usually consume a lot of energy and produce a lot of pollutants during the experiment, which does not meet the current requirements of energy conservation, emission reduction and environmental protection.

[0003] The hot blast furnace generates a lot of heat energy when providing high-temperature hot air to the blast furnace. However, this heat energy is often not fully and effectively utilized in the current production process, resulting in energy waste.

[0004] With the continuous advancement of science and technology and the pursuit of efficient use of resources, how to apply the hot air heat energy of the blast furnace hot blast stove to the sintering cup experiment to reduce experimental energy consumption, improve energy utilization efficiency, reduce environmental pollution, and provide more accurate and reliable data support for optimizing the sintering process has become an urgent problem to be solved in the steel industry.

[0005] In this context, an experimental device and method for sintering cup experiments using the thermal energy of hot air from a blast furnace hot blast stove were developed, which has important practical significance and application value. Summary of the invention

[0006] In view of the above problems, the purpose of the present invention is to provide a device and method for sintering using blast furnace hot air, aiming to use the hot air waste heat of the blast furnace hot blast stove as thermal energy to conduct sintering cup experiments in the laboratory.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] The present invention proposes a device for sintering using hot air from a blast furnace, comprising a sintering cup body, a crusher, a sintering cup platform, a lifting mechanism, a rotating mechanism, a hot air inlet cylinder, a hot air inlet pipe and a turning mechanism; the sintering cup body is vertically arranged in the middle of the upper surface of the sintering cup platform; the sintering cup body is connected to the sintering cup platform through a turning mechanism; the crusher is arranged directly in front of the sintering cup body; the hot air inlet cylinder is vertically arranged above the rear side of the sintering cup body; the lifting mechanism is vertically arranged on the rear side of the sintering cup body; the bottom of the hot air inlet cylinder is connected to the lifting mechanism through a rotating mechanism; the top of the hot air inlet cylinder is directly connected to the hot air pipe of the blast furnace hot blast furnace through a hot air inlet pipe.

[0009] Furthermore, the bottom of the sintering cup body is connected to a negative pressure exhaust fan through a negative pressure exhaust duct.

[0010] Furthermore, a pipeline control valve is provided on the hot air inlet pipeline.

[0011] A method for sintering using blast furnace hot air, comprising the following steps:

[0012] S1. According to the requirements of sintered ore for blast furnace, the pan concentrate, domestic high powder, domestic medium powder, steel slag, return ore, active ash and limestone are added into a mixer according to the calculated mass ratio for mixing, and atomized water is sprayed to prepare a uniform mixed material; then the uniform mixed material is poured into a second mixer for rolling to make it evenly roll into balls;

[0013] S2, evenly distribute the prepared mixture into the sintering cup body and wait for sintering;

[0014] S3, rotating the hot air inlet cylinder to the sintering position through the rotating mechanism, so that the hot air inlet cylinder is aligned with the top of the sintering cup body;

[0015] S4. Make the hot air inlet cylinder fall on the upper end of the sintering cup body through the lifting mechanism to ensure that the hot air inlet cylinder maintains good contact with the upper end of the sintering cup body during the sintering process and ensures sealing;

[0016] S5. Open the sintering cup operation interface, input relevant parameters, start the pipeline control valve, and allow the hot air from the blast furnace hot blast stove to enter the sintering cup body through the hot air inlet cylinder for sintering;

[0017] S6, control the lifting mechanism to make the hot air inlet cylinder leave the upper end of the sintering cup body, and then rotate the hot air inlet cylinder to the loading waiting position through the rotating mechanism;

[0018] S7. When the exhaust gas temperature of the negative pressure exhaust duct at the lower end of the sintering cup body rises to the highest and then drops to 95-105℃, the sintering process is completed. The sintered cakes in the sintering cup body are poured into the crusher through the flipping mechanism and roughly broken. After three drops, they are screened according to 40-25mm, 25-16mm, 16-10mm, 10-5mm, and <5mm. The proportion of >5mm is calculated, and the drum strength is tested according to standard requirements.

[0019] Furthermore, in step S1, the mixing time in the first mixer is 3-5 minutes, and the mixing time in the second mixer is 5-7 minutes.

[0020] Furthermore, in step S1, the proportion of the spherical mixture with a diameter greater than 3 mm should be controlled to be above 60%.

[0021] Furthermore, in step S5, the relevant parameters are: hot air velocity is 0.02-1 m / s, flow rate is 12-200m 3 / h, hot air temperature is 1000-1350℃, negative pressure value of sintering cup negative pressure exhaust fan is -16.5-0.5kpa, fixed time is 1-300 minutes.

[0022] Furthermore, in step S7, the spacing between the crushers is 45-55 mm; and the falling height of the falling treatment is 1.8-2.2 m.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention aims to carry out a sintering cup experiment by utilizing the hot air waste heat of a blast furnace hot blast stove as thermal energy when carrying out a sintering cup experiment in a laboratory.

[0025] First, the hot air from the hot blast furnace is a waste heat energy. Using the hot air energy from the hot blast furnace to conduct the sintering cup experiment can reduce the fuel consumption in the sintering process and reduce the sintering processing cost; secondly, using the hot air from the hot blast furnace to conduct the sintering cup experiment can increase the reaction speed of the sintering process due to the high temperature of the hot air, thereby shortening the experimental cycle and improving the experimental efficiency; finally, compared with the traditional sintering experiment method, using the hot air from the hot blast furnace to conduct the sintering cup experiment can reduce the emission of pollutants and is more environmentally friendly.

[0026] Therefore, the present invention has certain application prospects and advantages, and can contribute to energy conservation, emission reduction and sustainable development of the steel industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the main structure of a device for sintering using hot air from a blast furnace proposed by the present invention;

[0028] Figure 2 It is a schematic diagram of the top view of the structure of a device for sintering using blast furnace hot air proposed by the present invention.

[0029] Among them, the figure numbers are: 1-sintering cup body; 2-crusher; 3-sintering cup platform; 4-negative pressure exhaust duct; 5-lifting mechanism; 6-rotating mechanism; 7-hot air inlet cylinder; 8-hot air inlet duct; 9-crushing motor; 10-flipping mechanism; 11-pipeline control valve. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] It should be noted that, in the description of the present invention, the terms "up", "down", "top", "bottom", "one side", "the other side", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device or element must have a specific orientation, be constructed and operated in a specific orientation.

[0032] like Figure 1-2 As shown, a device for sintering using blast furnace hot air proposed in the present invention includes a sintering cup body 1, a crusher 2, a sintering cup platform 3, a lifting mechanism 5, a rotating mechanism 6, a hot air inlet cylinder 7, a hot air inlet pipeline 8 and a turning mechanism 10.

[0033] Among them, a ladder is arranged on one side of the sintering cup platform 3, so that workers can go up and down for inspection and operate the mechanism on the platform.

[0034] The sintering cup body 1 is vertically arranged in the middle of the upper surface of the sintering cup platform 3; the middle of the sintering cup body 1 is connected to the sintering cup platform 3 through a flipping mechanism 10, and the flipping mechanism 10 is used to drive the sintering cup body 1 to flip; the crusher 2 is correspondingly arranged in front of the sintering cup body 1 and is fixedly connected to the sintering cup platform 3, and is driven by a crushing motor 9; the hot air intake cylinder 7 is correspondingly arranged vertically above the rear side of the sintering cup body 1; the lifting mechanism 5 is vertically arranged at the rear side of the sintering cup body 1 and the bottom is fixedly connected to the sintering cup platform 3; the bottom of the hot air intake cylinder 7 is connected to the lifting mechanism through a rotating mechanism 6; the rotating motor of the rotating mechanism 6 realizes the horizontal rotation of the hot air intake cylinder 7; the lifting mechanism 5 realizes the lifting and lowering of the rotating mechanism 6 through the lifting motor, thereby driving the hot air intake cylinder 7 to lift and lower. The top of the hot air intake cylinder 7 is directly connected to the hot air duct of the blast furnace hot blast stove through a hot air intake duct 8.

[0035] In this embodiment, the bottom of the sintering cup body 1 is connected to the negative pressure exhaust fan through the negative pressure exhaust pipe 4; the hot air intake pipe 8 is provided with a pipe control valve 11.

[0036] A method for sintering using blast furnace hot air, comprising the following steps:

[0037] S1. According to the requirements of sintered ore for blast furnace, add the raw materials such as panning concentrate, domestic high powder, domestic medium powder, steel slag, return ore, active ash, limestone, etc. into the first mixer according to the calculated mass ratio, mix them evenly, spray atomized water, mix for 3-5 minutes, and prepare a uniform mixed material. Then pour the prepared uniform mixed material into the second mixer and roll it for 5-7 minutes to make it roll evenly into balls, ensuring that the part larger than 3mm in the mixture reaches more than 60%;

[0038] S2, evenly distribute the prepared mixed material into the sintering cup body and wait for sintering; in this embodiment, the sintering cup body is φ300mm and the height is 800mm;

[0039] Correspondingly, the diameter of the hot air inlet cylinder is 300mm, which is the same as the diameter of the sintering cup body 1. During the experiment, the hot air can evenly penetrate from the surface of the sintering raw material to the bottom of the material layer, so that the sintering raw material is heated evenly, the consolidation rate is fast, and the yield rate is high.

[0040] However, gas injection requires carbonization and is not carried out at the time of ignition, resulting in incomplete burning of the material layer and even failure of the experiment; all the temperature of gas injection is integrated under the nozzle, and there is no ignition around the nozzle, resulting in a slow consolidation rate and low finished product quality, which in turn affects the smooth progress of the experiment.

[0041] S3, rotating the hot air inlet cylinder to the sintering position through the rotating mechanism, so that the hot air inlet cylinder is aligned with the top of the sintering cup body;

[0042] S4. Make the hot air inlet cylinder fall on the upper end of the sintering cup body through the lifting mechanism to ensure that the hot air inlet cylinder maintains good contact with the upper end of the sintering cup body and has a certain sealing performance during the sintering process;

[0043] S5. Open the sintering cup operation interface and enter the relevant parameters: hot air rate is controlled at 0.02-1 m / s, flow rate is 12-200m 3 / h, hot air temperature 1000-1350℃, negative pressure value of sintering cup negative pressure exhaust fan -16.5-0.5kpa, start the pipeline control valve to allow the hot air from the blast furnace hot blast stove to enter the sintering cup body through the hot air inlet pipe for sintering, stop the pipeline control valve 11 after a fixed time of 1-300 minutes, and adjust the relevant parameters according to the process needs.

[0044] S6. Control the lifting mechanism to make the hot air inlet cylinder leave the upper end of the sintering cup body, and then rotate the hot air inlet cylinder to the loading waiting position through the rotating mechanism.

[0045] S7. When the exhaust gas temperature of the negative pressure exhaust duct at the lower end of the sintering cup body rises to the highest and then drops to 95-105℃, the sintering process is completed. The sintered cakes in the sintering cup body are poured into the crusher through the flip mechanism and roughly broken. After three drops, they are screened according to 40-25mm, 25-16mm, 16-10mm, 10-5mm, and <5mm. The proportion of >5mm is calculated, and the drum strength is tested according to the standard requirements. Among them, the spacing of the crusher is 45-55mm; the drop height of the drop treatment is 1.8-2.2m.

[0046] The key innovation of the present invention lies in the redesign of a hot air intake device: 1. The hot air from the hot blast furnace of the blast furnace is used to provide heat to replace carbon fuels such as coke powder and coal powder in the sintering raw materials, so as to achieve the purpose of reducing fuel consumption, and maintain sufficient hot air capacity and sintering crystallization time, so as to achieve the goal of carbon-free sintering and realize carbon reduction in the sintering process. 2. The hot air from the hot blast furnace is generated by burning secondary resources such as coke oven gas or blast furnace gas, which can greatly improve the utilization efficiency of hot air, thereby reducing the emission of harmful gases in the sintering process and reducing environmental protection costs. 3. The high temperature of the hot air can increase the reaction speed of the sintering process, thereby shortening the experimental cycle, improving the experimental efficiency, and greatly improving the quality indicators of sintering machine production.

[0047] The effect of the present invention is further demonstrated by specific examples below:

[0048] Table 1 shows the raw material ratios of the comparative example and the embodiment. The sintering cup experimental process is as follows:

[0049] Raw materials → adding water → first mixing → second mixing (adding water) → material distribution → sintering → crushing → falling → particle size classification → drum rotation and index testing.

[0050] Table 1 Ratio of sintering raw materials (by weight percentage)

[0051]

[0052] The main physical and chemical indicators of the above raw materials are:

[0053] Pan concentrate ω(TFe)=55.50%,ω(SiO 2 )=2.91%, ω(FeO)>30%, ω(TiO 2 )=11.89%,ω(particle size less than 0.074mm)>90%;

[0054] Domestic high powderω(TFe)=58.02%,ω(SiO 2 )=3.69%, ω(CaO)=2.04%;

[0055] Domestic medium powder ω(TFe)=42.82%, ω(SiO 2 )=27.59%, ω(CaO)=0.93%;

[0056] Active ash ω(CaO) 85-90%, ω(particle size less than 0.074mm)>80%;

[0057] Limestone ω(CaO) 50-55%, ω(particle size <3.0mm) = 100%;

[0058] Coke powder ash content 12-15%, ω (particle size <5.0mm) = 100%;

[0059] Return mineral ω (TFe) 49.50%, ω (SiO 2 )5.0-5.5%, ω(CaO)11.0-12.0%, ω(particle size<5mm)=100%.

[0060] Next, according to the proportions shown in Table 1, raw materials such as panjin concentrate, domestic high powder, domestic medium powder, activated ash, limestone, coke powder, and returned ore are processed according to the steps of the original sintering method and the sintering method of the present invention.

[0061] The specific conditions of the sintering of the comparative examples and embodiments are as follows:

[0062] Comparative ratio: 44% Panzhihua concentrate, 31.3% domestic high-grade powder, 4.5% domestic medium-grade powder, 2% steel slag, 30% returned ore, 4% active ash, 9.2% limestone, 5.0% coke powder, and the moisture content of the sintered mixture is 8.5±0.2%.

[0063] The results show that the drum strength of the sintered ore is 57.50%, the sintering yield is 69.46%, the TFe grade of the sintered ore is 49.62%, and the SiO 2 content 5.45%, CaO content 11.57%, TiO 2 content 6.07%, MnO content 0.14%, sintering basicity CaO / SiO 2 =2.12 times.

[0064] Example: 44% of Panzhihua concentrate, 31.3% of domestic high-grade powder, 4.5% of domestic medium-grade powder, 2% of steel slag, 30% of return ore, 4% of active ash, 9.2% of limestone, and the moisture content of the sintered mixture is 10±0.2%. The hot air velocity is controlled at 0.02 m / s and the flow rate is 12m 3 / h, negative pressure exhaust fan -16.5kpa.

[0065] The results show that the drum strength of the sintered ore is 71.50%, the sintering yield is 75.46%, the TFe grade of the sintered ore is 56.72%, FeO is 4.98%, SiO 2 content 5.17%, CaO content 10.04%, TiO 2 content 4%, MnO content 1.55%, sintering basicity CaO / SiO 2 =1.94 times.

[0066] From the above results, it can be seen that through the implementation of the method of the present invention, the strength of the ore drum and the yield rate are significantly improved. With the increase of the yield rate, the processing cost is significantly reduced, which has significant economic benefits. At the same time, the blast furnace hot air resources are reused, which has obvious environmental benefits.

[0067] Matters not described in detail in the present invention are all known technologies.

[0068] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for sintering using hot air from a blast furnace, characterized in that: The device includes a sintering cup body, a crusher, a sintering cup platform, a lifting mechanism, a rotating mechanism, a hot air inlet cylinder, a hot air inlet pipe and a flipping mechanism; the sintering cup body is vertically arranged in the middle of the upper surface of the sintering cup platform; the sintering cup body is connected to the sintering cup platform through a flipping mechanism; the crusher is arranged directly in front of the sintering cup body; the hot air inlet cylinder is vertically arranged above the rear side of the sintering cup body; the lifting mechanism is vertically arranged on the rear side of the sintering cup body; the bottom of the hot air inlet cylinder is connected to the lifting mechanism through a rotating mechanism; the top of the hot air inlet cylinder is directly connected to the hot air pipe of the blast furnace hot blast furnace through a hot air inlet pipe.

2. The device for sintering using hot air from a blast furnace according to claim 1, characterized in that: The bottom of the sintering cup body is connected to a negative pressure exhaust fan through a negative pressure exhaust pipe.

3. The device for sintering using hot air from a blast furnace according to claim 2, characterized in that: The hot air inlet pipeline is provided with a pipeline control valve.

4. A sintering method using a blast furnace hot air sintering device as claimed in claim 3, characterized in that: The following steps are involved: S1. According to the requirements of sintered ore for blast furnace, the pan concentrate, domestic high powder, domestic medium powder, steel slag, return ore, active ash and limestone are added into a mixer according to the calculated mass ratio for mixing, and atomized water is sprayed to prepare a uniform mixed material; then the uniform mixed material is poured into a second mixer for rolling to make it evenly roll into balls; S2, evenly distribute the prepared mixture into the sintering cup body and wait for sintering; S3, rotating the hot air inlet cylinder to the sintering position through the rotating mechanism, so that the hot air inlet cylinder is aligned with the top of the sintering cup body; S4. Make the hot air inlet cylinder fall on the upper end of the sintering cup body through the lifting mechanism to ensure that the hot air inlet cylinder maintains good contact with the upper end of the sintering cup body during the sintering process and ensures sealing; S5. Open the sintering cup operation interface, input relevant parameters, start the pipeline control valve, and allow the hot air from the blast furnace hot blast stove to enter the sintering cup body through the hot air inlet cylinder for sintering; S6, control the lifting mechanism to make the hot air inlet cylinder leave the upper end of the sintering cup body, and then rotate the hot air inlet cylinder to the loading waiting position through the rotating mechanism; S7. When the exhaust gas temperature of the negative pressure exhaust duct at the lower end of the sintering cup body rises to the highest and then drops to 95-105℃, the sintering process is completed. The sintered cakes in the sintering cup body are poured into the crusher through the flipping mechanism and roughly broken. After three drops, they are screened according to 40-25mm, 25-16mm, 16-10mm, 10-5mm, and <5mm. The proportion of >5mm is calculated, and the drum strength is tested according to standard requirements.

5. The method of sintering using hot air from a blast furnace according to claim 4, characterized in that: In step S1, the mixing time in the first mixer is 3-5 minutes, and the mixing time in the second mixer is 5-7 minutes.

6. The method of sintering using hot air from a blast furnace according to claim 4, characterized in that: In step S1, the proportion of the spherical mixture with a diameter greater than 3 mm should be controlled to be above 60%.

7. The method of sintering using hot air from a blast furnace according to claim 4, characterized in that: In step S5, the relevant parameters are: hot air velocity is 0.02-1 m / s, flow rate is 12-200m 3 / h, hot air temperature is 1000-1350℃, negative pressure value of sintering cup negative pressure exhaust fan is -16.5-0.5kpa, fixed time is 1-300 minutes.

8. The method of sintering using hot air from a blast furnace according to claim 4, characterized in that: In step S7, the spacing between the crushers is 45-55 mm; and the falling height of the falling treatment is 1.8-2.2 m.

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