阅读说明：本技术 一种铁矿粉烧结工艺 (Iron ore powder sintering process ) 是由 赵华 廖相巍 周鹏 马银华 刘杰 何冲 张智勇 吴官印 于 2021-06-29 设计创作，主要内容包括：本发明涉及一种铁矿粉烧结工艺,包括：1)将烧结混合料输送到临时储槽中；2)在拦焦车上设置倒料储槽,通过临时储槽将烧结混合料输运至倒料储槽中；3)红焦从焦炉炭化室内推出,进入熄焦车上的旋转焦罐中时,将倒运储槽中的烧结混合料加入到旋转焦罐中,烧结混合料与部分红焦反应生成烧结矿；4)熄焦车运行至干熄焦井架下,通过干熄焦提升机将旋转焦罐提升,通过干熄焦炉装入装置将红焦与烧结矿的混合物装入干熄焦炉内进行冷却。本发明利用旋转焦罐中红焦的余热与烧结混合料反应炼制烧结矿,可以有效降低烧结成本,实现红焦余热和烧结矿余热的回收利用。(The invention relates to an iron ore powder sintering process, which comprises the following steps: 1) conveying the sintering mixture to a temporary storage tank; 2) arranging a dumping storage tank on the coke guide, and conveying the sintering mixture to the dumping storage tank through a temporary storage tank; 3) the red coke is pushed out from the coke oven carbonization chamber and enters a rotary coke tank on a coke quenching car, the sintering mixture in the transportation storage tank is added into the rotary coke tank, and the sintering mixture reacts with part of the red coke to generate sintering ore; 4) the coke quenching car runs to the position under a coke dry quenching derrick, the rotary coke tank is lifted by a coke dry quenching lifter, and the mixture of the red coke and the sinter is loaded into a coke dry quenching furnace for cooling by a coke dry quenching furnace loading device. The invention utilizes the reaction of the waste heat of the red coke in the rotary coke tank and the sintering mixture to refine the sintering ore, can effectively reduce the sintering cost and realize the recycling of the waste heat of the red coke and the waste heat of the sintering ore.)

1. The iron ore powder sintering process is characterized by comprising the following steps of:

1) conveying the sintering mixture to a temporary storage tank;

2) arranging a dumping storage tank on the coke guide, and conveying the sintering mixture to the dumping storage tank through a temporary storage tank;

3) the red coke is pushed out from a coke oven carbonization chamber and is added into a rotary coke tank on a coke quenching car, the sintering mixture in the transportation storage tank is added into the rotary coke tank, the red coke preheats and dries the sintering mixture, and then the fuel in the sintering mixture is ignited, so that the iron ore powder forms sintering ore in high-temperature combustion;

4) the coke quenching car runs to the position under a coke dry quenching derrick, the rotary coke tank is lifted by a coke dry quenching lifter, and the mixture of the red coke and the sinter is loaded into a coke dry quenching furnace for cooling by a coke dry quenching furnace loading device.

2. The iron ore powder sintering process according to claim 1, wherein in the step 3), the process of loading the sintering mixture into the rotary coke tank comprises the following steps: and after coke pushing is finished, starting to fill the sintering mixture into the rotary coke tank, wherein the sintering mixture is distributed on the top of the red coke, and the thickness of the sintering mixture is less than 100 mm.

3. The iron ore powder sintering process according to claim 1, wherein in the step 3), the process of loading the sintering mixture into the rotary coke tank comprises the following steps: when the coke oven discharges coke, after the bottom of the rotary coke tank is fully filled with red coke, the rotary coke tank is filled with a sintering mixture, and the coke oven stops after the coke discharging is finished.

4. The iron ore powder sintering process according to claim 1, wherein in the step 2), a dust removal system of a coke guide is used for removing smoke dust generated in the sintering process.

Technical Field

The invention relates to the technical field of blast furnace smelting, in particular to an iron ore powder sintering process.

Background

At first, blast furnace iron making can only screen out large pieces of mined iron ore to be used in a furnace, and fine powder cannot be used in the furnace, and then, as large pieces of high-grade iron ore are less, a sintering method is adopted to utilize iron ore powder. The iron ore powder sintering is to mix fine iron-containing materials with fuel and flux according to a certain proportion, then add water to wet, mix and pelletize to form a sintering mixture, distribute the mixture on a sintering device, generate partial low-melting-point substances by virtue of high temperature and a series of physical and chemical changes generated by fuel combustion through ignition and air draft, soften and melt to generate a certain amount of liquid phase, bond iron mineral particles, cool and solidify to form a porous block product with certain strength, namely sintering ore.

At present, sintering machines are adopted domestically to realize the production of sintered ores, the sintering process is complex, the production cost is high (about 800 yuan/ton), and the consumption of solid fuel and ignition gas in the energy consumption of the sintering process accounts for 75 percent, so that the blast furnace ironmaking cost is high. Meanwhile, by adopting the dry quenching technology, although the coal blending cost can be reduced by about 5 percent and about 30 percent of the heat output by the coke oven is recovered, a large amount of heat is lost in a white manner in the process that red coke at 1000 ℃ is pushed out of the coke oven and enters the dry quenching furnace.

Disclosure of Invention

The invention provides an iron ore powder sintering process, which is used for refining sintered ore by reacting the waste heat of red coke in a rotary coke tank with a sintering mixture, so that the sintering cost can be effectively reduced, and the recovery and utilization of the waste heat of the red coke and the waste heat of the sintered ore are realized.

In order to achieve the purpose, the invention adopts the following technical scheme:

an iron ore powder sintering process comprises the following steps:

1) conveying the sintering mixture to a temporary storage tank;

2) arranging a dumping storage tank on the coke guide, and conveying the sintering mixture to the dumping storage tank through a temporary storage tank;

3) the red coke is pushed out from a coke oven carbonization chamber and is added into a rotary coke tank on a coke quenching car, the sintering mixture in the transportation storage tank is added into the rotary coke tank, the red coke preheats and dries the sintering mixture, and then the fuel in the sintering mixture is ignited, so that the iron ore powder forms sintering ore in high-temperature combustion;

4) the coke quenching car runs to the position under a coke dry quenching derrick, the rotary coke tank is lifted by a coke dry quenching lifter, and the mixture of the red coke and the sinter is loaded into a coke dry quenching furnace for cooling by a coke dry quenching furnace loading device.

In the step 3), the process of filling the sintering mixture into the rotary coke tank comprises the following steps: and after coke pushing is finished, starting to fill the sintering mixture into the rotary coke tank, wherein the sintering mixture is distributed on the top of the red coke, and the thickness of the sintering mixture is less than 100 mm.

In the step 3), the process of filling the sintering mixture into the rotary coke tank comprises the following steps: when the coke oven discharges coke, after the bottom of the rotary coke tank is fully filled with red coke, the rotary coke tank is filled with a sintering mixture, and the coke oven stops after the coke discharging is finished.

And in the step 2), the dust generated in the sintering process is removed by using a dust removal system of the coke guide.

Compared with the prior art, the invention has the beneficial effects that:

1) 50 more than ten thousand tons of sintered ore are refined in a coking plant per year, the capacity of the sintering machine is close to one month, and the smelting capacity of the sintered ore is improved;

2) the sinter and the coke react in advance, so that the reaction time in the blast furnace is reduced, and meanwhile, the coke and the sinter are mixed according to the ratio of 1: about 5, the raw materials are uniformly mixed together, so that the ore coke distribution and mixing property is improved, and the utilization coefficient of the blast furnace can be improved;

3) the waste heat utilization rate of the red coke is improved, and the waste heat recovery utilization rate of the red coke is improved by at least 10 percent;

4) the sintered ore and the red coke enter the dry quenching furnace to be cooled simultaneously, so that the recovery quantity of the waste heat of the dry quenching furnace is improved, and the generation quantity of 1/5 steam can be increased;

5) the equivalent sintered ore is produced, the material consumption of the fuel for sintering can be reduced by more than 80 percent, and electric energy and coal gas are not consumed; the energy consumption cost for smelting the sinter is greatly reduced;

6) the coke is wrapped by the melt in the sintering process, which is beneficial to improving the quality index of the coke;

7) the function of the coke guide is increased, and the utilization rate of the coke oven vehicle is improved.

Detailed Description

The invention relates to an iron ore powder sintering process, which comprises the following steps:

1) conveying the sintering mixture to a temporary storage tank;

2) arranging a dumping storage tank on the coke guide, and conveying the sintering mixture to the dumping storage tank through a temporary storage tank;

3) the red coke is pushed out from a coke oven carbonization chamber and is added into a rotary coke tank on a coke quenching car, the sintering mixture in the transportation storage tank is added into the rotary coke tank, the red coke preheats and dries the sintering mixture, and then the fuel in the sintering mixture is ignited, so that the iron ore powder forms sintering ore in high-temperature combustion;

4) the coke quenching car runs to the position under a coke dry quenching derrick, the rotary coke tank is lifted by a coke dry quenching lifter, and the mixture of the red coke and the sinter is loaded into a coke dry quenching furnace for cooling by a coke dry quenching furnace loading device.

In the step 3), the process of filling the sintering mixture into the rotary coke tank comprises the following steps: and after coke pushing is finished, starting to fill the sintering mixture into the rotary coke tank, wherein the sintering mixture is distributed on the top of the red coke, and the thickness of the sintering mixture is less than 100 mm.

In the step 3), the process of filling the sintering mixture into the rotary coke tank comprises the following steps: when the coke oven discharges coke, after the bottom of the rotary coke tank is fully filled with red coke, the rotary coke tank is filled with a sintering mixture, and the coke oven stops after the coke discharging is finished.

And in the step 2), the dust generated in the sintering process is removed by using a dust removal system of the coke guide.

The invention adds a dumping storage tank on a coke guide, which is used for transferring sintering mixture in a temporary storage tank to a rotary coke tank on the coke guide, and dumping the sintering mixture in the dumping storage tank into the rotary coke tank on the coke guide in the process of pushing red coke from a coke oven carbonization chamber into the rotary coke tank of the coke guide, so that the sintering mixture and a part of the red coke are sintered in advance, and simultaneously, dust in the sintering process is removed by using a dust removal system of the coke guide. And the coke quenching car is used for loading the red coke and the sintered ore in the rotary coke tank into a dry quenching furnace for cooling, the cooled coke and the sintered ore enter a blast furnace to participate in a smelting process, and the ratio of the coke to the sintered ore is 1: 4-6, and mixing uniformly.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.