阅读说明：本技术 一种应用于高炉渣干法离心粒化的风冷装置及方法 (Air cooling device and method applied to dry centrifugal granulation of blast furnace slag ) 是由 王凯 胡凤超 仪垂杰 孙广彤 纪慧敏 黄友亮 战胜 于 2019-09-29 设计创作，主要内容包括：本发明属于熔渣处理技术领域,涉及高炉渣干法粒化的装置及方法。一种应用于高炉渣干法离心粒化的风冷装置,包括：粒化仓；粒化盘,设置在所述粒化仓的中上部；电机,与所述粒化盘连接,驱动粒化盘旋转；风冷组件,用于在所述粒化仓内形成风场,冷却粒化的熔渣。本发明的应用于高炉渣干法离心粒化的风冷装置及方法,在粒化仓内形成合适的风场,一方面使高温液态熔渣经粒化后能够充分冷却得到获得足够的玻璃体含量；另一方面能够对粒化仓壁进行冷却,防止粒化仓壁与熔渣的粘结,提高设备的使用寿命。(The invention belongs to the technical field of slag treatment, and relates to a device and a method for blast furnace slag dry granulation. An air cooling device applied to dry centrifugal granulation of blast furnace slag comprises: a granulation bin; the granulating disc is arranged at the middle upper part of the granulating bin; the motor is connected with the granulating disc and drives the granulating disc to rotate; and the air cooling assembly is used for forming an air field in the granulating bin and cooling the granulated slag. According to the air cooling device and the air cooling method applied to the dry centrifugal granulation of the blast furnace slag, a proper wind field is formed in the granulation bin, so that on one hand, the high-temperature liquid slag can be fully cooled after being granulated to obtain enough vitreous body content; on the other hand, the wall of the granulating bin can be cooled, so that the adhesion between the wall of the granulating bin and the molten slag is prevented, and the service life of the equipment is prolonged.)

1. The air cooling device applied to the dry centrifugal granulation of the blast furnace slag is characterized by comprising the following components:

a granulation bin;

the granulating disc is arranged at the middle upper part of the granulating bin;

the motor is connected with the granulating disc and drives the granulating disc to rotate;

and the air cooling assembly is used for forming an air field in the granulating bin and cooling the granulated slag.

2. The air cooling device applied to the dry centrifugal granulation of the blast furnace slag according to the claim 1, wherein the air cooling component consists of a fan, a pipeline and an air distribution pipe, the fan is connected with the air distribution pipe through the pipeline, and the air distribution pipe is arranged at the bottom of the granulation bin; the air distribution pipe is provided with a plurality of air inlets; the air inlet faces the wall of the granulating bin.

3. The air cooling device applied to the dry centrifugal granulation of the blast furnace slag according to the claim 2, wherein the air distribution pipe is a circular ring-shaped pipeline and is arranged along the circumference of the bottom of the granulation bin.

4. The air cooling device applied to blast furnace slag dry centrifugal granulation according to claim 2, wherein a top cover is arranged at the upper part of the granulation chamber, and an air outlet and a slag inflow port are formed in the top cover.

5. The air cooling device applied to the dry centrifugal granulation of the blast furnace slag according to the claim 1, is characterized by further comprising an air speed adjusting and controlling component; the wind speed adjusting and controlling assembly comprises a temperature sensor, a frequency converter and a PLC, wherein the frequency converter is connected with the fan, and the temperature sensor and the frequency converter are connected with the PLC; the temperature sensor is used for measuring the temperature in the granulating bin.

6. The air cooling device applied to the dry centrifugal granulation of the blast furnace slag according to any one of claims 1 to 5, further comprising a crucible, wherein the middle part of the crucible is provided with a slag outflow port.

7. The air cooling device applied to the dry centrifugal granulation of the blast furnace slag according to the claim 6, wherein the slag outflow port is provided with a stopper rod; the upper section of the slag outflow port is funnel-shaped, the lower section of the stopper rod is conical, and the stopper rod is matched with the conical surface of the upper section of the slag outflow port.

8. A method for dry centrifugal granulation of blast furnace slag comprises the following steps:

starting a fan, and enabling cold air to enter the granulation cabin to form an air field;

granulating the liquid high-temperature slag into granules under the action of a granulating disc, and flying out at a high speed;

the flying slag particles are cooled in the wind field to form slag particles.

9. The method for dry centrifugal granulation of blast furnace slag according to claim 8, wherein the wind speed of the wind field is adaptively adjusted according to the temperature inside the granulation chamber; the method for adjusting the wind speed comprises the following steps: and the frequency converter is controlled through a discrete PID (proportion integration differentiation) adjusting algorithm compiled in the PLC, the rotating speed of the fan is further controlled, and the air intake is controlled in real time.

10. The method for blast furnace slag dry centrifugal granulation according to claim 9, wherein the discrete PID adjustment algorithm formula is as follows:

Technical Field

The invention belongs to the technical field of slag treatment, and relates to a device and a method for blast furnace slag dry granulation.

Background

The iron and steel industry is a prop industry of national economy in China, a large amount of blast furnace slag byproducts can be generated from sintered iron ores in the iron making process, according to research, about 0.3-0.4 ton of blast furnace slag is generated every ton of pig iron is generated, the temperature is about 1500 ℃, and the iron and steel industry has the characteristics of large yield and high heat. Meanwhile, the main components of the blast furnace slag are SiO2, CaO, MgO and Al2O3, and the blast furnace slag is a raw material for manufacturing cement.

The traditional blast furnace slag treatment process is a water quenching method, after liquid slag and molten iron are separated, a large amount of tap water is used for carrying out water flushing treatment on the blast furnace slag, the process not only wastes a large amount of water resources, but also causes a large amount of loss of heat resources in the blast furnace slag, and simultaneously generates a large amount of SO₂、H₂S pollutes gas and brings great influence on environmental management.

After the liquid slag and the molten iron are separated, the liquid slag needs a certain cooling rate after centrifugal granulation through a centrifugal device, so that the content of the vitreous body of the liquid slag reaches more than 92 percent, the maximum doping ratio can be obtained, and the liquid slag and the cement are mutually doped to be used as building materials. Because the dry centrifugal granulation is adopted, the liquid slag can be cooled only by using an air cooling mode, and therefore, the air cooling device capable of effectively cooling slag particles is indispensable.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention provides an air cooling device for blast furnace slag dry granulation, which aims to form a proper air field in a granulation bin, so that on one hand, high-temperature liquid slag can be fully cooled after granulation to obtain enough vitreous body content; on the other hand, the wall of the granulating bin can be cooled, and the service life of the equipment is prolonged.

The technical scheme adopted by the invention for solving the technical problems is as follows: an air cooling device applied to dry centrifugal granulation of blast furnace slag comprises:

a granulation bin;

the granulating disc is arranged at the middle upper part of the granulating bin;

the motor is connected with the granulating disc and drives the granulating disc to rotate;

and the air cooling assembly is used for forming an air field in the granulating bin and cooling the granulated slag.

As a further improvement of the invention, the air cooling assembly consists of a fan, a pipeline and an air distribution pipe, wherein the fan is connected with the air distribution pipe through the pipeline, and the air distribution pipe is arranged at the bottom of the granulation cabin; the air distribution pipe is provided with a plurality of air inlets; the air inlet faces the wall of the granulating bin.

As a further improvement of the invention, the air distribution pipe is a circular ring-shaped pipeline and is arranged along the bottom of the granulation cabin in a circle.

As a further improvement of the invention, the upper part of the granulating bin is provided with a top cover, and the top cover is provided with an air outlet.

As a further improvement of the invention, the wind speed adjusting and controlling component is also included; the wind speed adjusting and controlling assembly comprises a temperature sensor, a frequency converter and a PLC, wherein the frequency converter is connected with the fan, and the temperature sensor and the frequency converter are connected with the PLC.

As a further improvement of the invention, the air cooling device also comprises a crucible, wherein the middle part of the crucible is provided with a slag outflow port; the slag outflow is opposite the granulation disk.

As a further improvement of the invention, the upper section of the slag outflow port is funnel-shaped; the slag outflow port is provided with a stopper rod, the lower section of the stopper rod is conical, and the stopper rod is matched with the conical surface of the slag outflow port.

The invention solves the technical problem, and adopts another technical scheme that: a method for dry centrifugal granulation of blast furnace slag comprises the following steps:

starting a fan, and enabling cold air to enter the granulation cabin to form an air field;

granulating the liquid high-temperature slag into granules under the action of a granulating disc, and flying out at a high speed;

the flying slag particles are cooled in the wind field to form slag particles.

As a further improvement of the invention, the wind speed of the wind field is self-adaptively adjusted according to the temperature in the granulation cabin, so that the temperature in the granulation cabin is matched with the rotating speed of the fan.

As a further improvement of the invention, the method for adjusting the wind speed comprises the following steps: and the frequency converter is controlled through a discrete PID (proportion integration differentiation) adjusting algorithm compiled in the PLC, the rotating speed of the fan is further controlled, and the air intake is controlled in real time.

As a further improvement of the invention, the discrete PID adjustment algorithm formula is as follows:

k_p,k_i,k_dthree regulating coefficients are respectively set, and the measured air outlet temperature and the calculation error are substituted into the above formula to regulate the corresponding air inlet quantity so as to achieve the purpose of self-adaptive control of the air quantity.

According to the air cooling device and the air cooling method applied to the dry centrifugal granulation of the blast furnace slag, a proper wind field is formed in the granulation bin, so that on one hand, the high-temperature liquid slag can be fully cooled after being granulated to obtain enough vitreous body content; on the other hand, the wall of the granulating bin can be cooled, so that the adhesion between the wall of the granulating bin and the molten slag is prevented, and the service life of the equipment is prolonged.

Compared with the prior art, the air cooling device and the method applied to the dry centrifugal granulation of the blast furnace slag have the beneficial effects that:

1. effectively cooling the high-temperature particles in flight to reach the content of glass bodies of more than 95 percent;

2. through the design and simulation of the structure of the air inlet and the air outlet, a specific wind field is formed in the granulation cabin, and a good cooling effect of the whole process of the high-temperature particles in the flying process is realized;

3. the air inlet volume can be adjusted in real time according to the flow change, and the optimal cooling effect is achieved;

4. the cooling device can cool the wall of the granulating bin, prevent the wall of the granulating bin from being bonded when colliding with high-temperature molten slag droplets, protect the wall of the granulating bin and prolong the service life of the granulating bin.

5. The system can operate only by remotely setting parameters without human intervention, on one hand, workers are protected, and on the other hand, errors caused by human operation are reduced.

Drawings

FIG. 1 is a schematic structural connection diagram of an air cooling device applied to dry centrifugal granulation of blast furnace slag in an embodiment of the invention;

FIG. 2 is a top view of a granulation chamber;

fig. 3 is an external view of the granulation chamber;

FIG. 4 is a schematic view of an air field formed by 20 air inlets which are arranged on the air distribution pipe and face the wall of the granulating bin;

FIG. 5 is a schematic view of an air field formed by arranging 30 air inlets facing the wall of the granulating bin on an air distribution pipe;

FIG. 6 is a schematic view of an air field formed by 20 vertical air inlets arranged on the air distribution pipe;

fig. 7 is a schematic view of an air field formed by arranging 30 vertical air inlets on an air distribution pipe.

Detailed Description

In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.