CN205128124U - Superheated steam jet milling device - Google Patents

Abstract

The utility model discloses a superheated steam airflow crushing device. According to the flow direction of materials, the crushing device includes a material conveying device, a material crushing device and a material collecting device which are sequentially connected through pipelines. The material crushing device adopts a superheated steam airflow crushing machine , The utility model adopts a superheated steam airflow pulverizer, and superheated steam is used as a working medium in the production process to prepare powder with finer particles, and the yield is higher when the output particle size is the same. The energy conversion process of the superheated steam jet mill directly produces superfine powder through fuel-heat energy, so the energy conversion efficiency of the superheated steam jet mill is higher and more energy-saving. The whole system is designed with high temperature resistance, anti-condensation, and external bearings to ensure continuous and stable operation of the equipment under harsh working conditions.

Description

A superheated steam jet pulverization device

technical field

The utility model relates to a crushing device which uses high-temperature superheated steam as a crushing medium to prepare superfine powder, and belongs to the technical field of material crushing.

Background technique

At present, there are a large amount of industrial solid waste in my country that needs to be processed and comprehensively utilized, such as steel slag, slag, fly ash, coal gangue, industrial by-product gypsum, red mud, and other non-ferrous and rare metal tailings, lean ore, etc. , when the above-mentioned solid wastes are comprehensively utilized with high added value, most of them need ultra-fine crushing treatment. The crushing and processing of the above-mentioned solid waste needs to achieve large output, low cost and ultra-fine, but the existing crushing technology cannot meet the above conditions.

At present, there are three main methods for the ultra-fine crushing of the above-mentioned solid wastes at home and abroad: traditional equipment such as ball mills, vertical mills, and vibration mills. The traditional airflow pulverization method using air energy as the medium. The airflow pulverization method using steam as the medium.

Above-mentioned three kinds of ways all have following defect:

The energy conversion of traditional jet mills generally goes through fuel-heat energy-mechanical energy-electric energy-mechanical energy-air energy, and ultrafine powder can be produced after multiple energy conversions. The energy conversion of the ball mill needs to go through fuel-heat energy-mechanical energy-electric energy-mechanical energy, and finally produce ultra-fine powder.

Traditional equipment such as ball mills, vertical mills, and vibration mills can achieve large output, but the energy consumption in the production process is high, and the product particle size is not ideal.

The traditional airflow milling method using air energy as the medium; although finer product particles can be achieved

However, the energy utilization rate is low, the energy consumption is too high, and the production cost is unacceptable.

And, as shown in Figure 3, in the prior art, the jet mill nozzles are evenly distributed in the prior art. During pulverization, multiple high-pressure air streams are sprayed horizontally and meet at the geometric center of the plane to complete the pulverization function. There is no pulverization function in the vertical direction. The bottom of the cavity is easy to accumulate materials, which constitutes a dead angle for crushing and cleaning.

Because the traditional bag filter cone cannot be fully preheated at the initial stage of operation, most of the hot air in the bag moves in the upper part of the cavity during preheating, and the amount of hot air in the lower part is less, so the temperature of the lower cone continues to be low, resulting in condensation water.

For conventional jet mills, since the bearings are installed in the grading chamber, the temperature in the grading chamber is relatively high (about 200°C) when the system is running. Therefore, the temperature rise of the bearings closely connected with the main shaft must be detected in real time to avoid damage caused by overheating of the bearings.

The patent document (201110240958.4) introduces a large-scale high-temperature-resistant flat jet mill, which uses superheated steam as the grinding medium, and has low production cost. However, due to the simple structure of the mill and low classification accuracy, it cannot produce ultrafine particles.

Related papers and documents, Wang Yaping, Zhu Mucheng, Chen Haiyan and others from Southwest University of Science and Technology conducted theoretical research and industrial experiments on superheated steam jet mills. The research results show that steam mills using superheated steam as The traditional jet mill of the medium has the advantages of high output and fine product particle size, but the above research and experiments cannot meet the needs of large-scale industrial production, the single machine capacity is low, and the product particle size is not ideal.

In order to solve the above drawbacks, it is necessary to develop a new type of crushing equipment to replace traditional crushing methods such as ball mills, vertical mills, jet mills, and the original domestic superheated steam jet mills, so as to achieve higher output in the production process and finer product particle size. The purpose of lower energy consumption.

Utility model content

The technical problem to be solved by the utility model is to provide a crushing device that uses high-temperature superheated steam as a crushing medium to prepare superfine powder. The crushing device has low energy consumption in the production process, fine particle size and high output.

In order to solve the problems of the technologies described above, the technical solution of the utility model is:

A superheated steam jet crushing device, according to the flow direction of the material, the crushing device includes a material conveying device, a material crushing device and a material collecting device connected through pipelines in sequence, and the material crushing device adopts a superheated steam jet pulverizer.

Below is the further optimization of the above-mentioned scheme in the utility model:

The superheated steam jet pulverizer includes a machine body, which has an inner cavity, the upper part of the inner cavity is a grading chamber, and the lower part is a crushing chamber; at least one grading impeller is installed in the grading chamber.

The airflow fed into the superheated steam jet mill is high temperature and high pressure steam, the temperature of the high temperature and high pressure steam is 150-400°C, and the pressure is 4bar-20bar.

Further optimization: the grading impeller is placed horizontally in the grading chamber.

Another optimization: the grading impeller is arranged longitudinally in the grading cavity.

Further optimization: a main shaft is installed in the central hole of the grading impeller, and the main shaft is connected with the power transmission device. The setting of the grading impeller is not only beneficial to increase the product output, but also can realize the ultra-fine product.

The material conveying device includes a feeding device for conveying the material to the superheated steam jet pulverizer.

The material collection device includes a bag filter. The upper part of the bag filter is equipped with a heat preservation device, and the lower part of the vertebral body is equipped with an electric heating device.

The electric heating device is used for separate heating, and multiple superheated steam pipeline inlets are installed at the bottom of the vertebral body, so that superheated steam can be fed at the same time to shorten the preheating time.

Further optimization: the inlet of the superheated steam airflow pulverizer is connected to the feeding device, and its outlet is connected to the bag filter. The upper part of the bag filter is equipped with an induced fan, and the lower end of the air outlet pipe of the induced fan is equipped with a drainage device.

Further optimization: several supersonic shrinking and expanding Laval nozzles are evenly installed on the body outside the crushing chamber; a Laval nozzle is also installed on the bottom of the body; the spraying directions of several Laval nozzles converge At the same central point in the crushing chamber.

The Laval nozzles at the bottom of the machine body and multiple horizontally distributed Laval nozzles together form a nozzle group distributed in three-dimensional space, which not only increases the probability of material collision and contact, improves the crushing efficiency, but also effectively prevents the accumulation of materials at the bottom of the cavity, reducing Cleaning time.

A high-pressure gas ring for feeding high-temperature and high-pressure steam is provided outside the machine body; the high-pressure gas ring communicates with several Laval nozzles.

The utility model adopts a superheated steam airflow pulverizer, and superheated steam is used as a working medium in the production process. The high-temperature steam introduced is at 150-400°C and the pressure is 4bar-20bar, and the generated supersonic airflow can reach 1120m/s. Due to the jet flow The speed is high. Compared with the traditional jet mill, which uses compressed air as the working medium, the input kinetic energy is about 4.3 times higher. It can prepare finer powder, and the yield is higher when the output particle size is the same. The energy conversion process of the superheated steam jet mill directly produces superfine powder through fuel-heat energy, so the energy conversion efficiency of the superheated steam jet mill is higher and more energy-saving. The whole system is designed with high temperature resistance, anti-condensation, and external bearings to ensure continuous and stable operation of the equipment under harsh working conditions.

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Description of drawings

Accompanying drawing 1 is the structural representation of the utility model embodiment 1;

Accompanying drawing 2 is the structural representation of superheated steam jet pulverizer in the utility model embodiment 1;

Accompanying drawing 3 is the nozzle installation position schematic diagram of jet pulverizer in the utility model background technology;

Accompanying drawing 4 is the installation position schematic diagram of nozzle in the utility model embodiment 1;

Accompanying drawing 5 is the structure schematic diagram when grading impeller is longitudinally arranged in the utility model embodiment 2;

Accompanying drawing 6 is the structure diagram when the grading impeller is arranged horizontally in Embodiment 3 of the present utility model.

In the figure: 1-superheated steam jet mill; 11-high pressure gas ring; 12-classification chamber; 13-crushing chamber; 14-Laval nozzle; 15-classification impeller; 16-main shaft; 17-classification motor; 18-impeller Bearing seat; 19-bearing; 2-feeding device; 3-bag filter; 31-insulation device; 32-electric heating device; 4-induced fan; A-body.

detailed description

Embodiment 1: As shown in Figure 1, a superheated steam airflow pulverization device, according to the flow direction of the material, the pulverization device includes a material conveying device, a material pulverization device and a material collection device connected through pipelines in sequence.

The material pulverizing device is superheated steam jet pulverizer 1, and the air flow into the superheated steam jet pulverizer is high-temperature and high-pressure steam, the temperature of high-temperature and high-pressure steam is 150-400°C, and the pressure is 4bar-20bar.

In the production process of superheated steam jet mill, superheated steam is used as the working medium. The high-temperature steam introduced is at 150-400°C, the pressure is 4bar-20bar, and the supersonic airflow generated can reach 1120m/s. Due to the high jet flow velocity, compared The traditional jet mill uses compressed air as the working medium, and the input kinetic energy is about 4.3 times higher, which can produce finer powder, and the yield is higher when the output particle size is the same.

The energy conversion process of the superheated steam jet mill directly produces superfine powder through fuel-heat energy, so the energy conversion efficiency of the superheated steam jet mill is higher and more energy-saving.

The material conveying device includes a feeding device 2 for conveying the material to the superheated steam jet pulverizer 1 .

The material collection device is a bag filter 3, the upper part of the bag filter 3 is equipped with a thermal insulation device 31, and the lower vertebral body is equipped with an electric heating device 32 and a plurality of superheated steam pipe inlets.

The electric heating device 32 is used for separate heating, and a plurality of superheated steam pipe inlets are installed at the bottom of the vertebral body, so that superheated steam can be fed simultaneously to shorten the preheating time.

The superheated steam air flow pulverizer 1 feed port is connected to the feed device 2, and its discharge port is connected to the bag filter 3. The upper part of the bag filter 3 is equipped with an induced fan 4, and the lower end of the air outlet pipe of the induced fan 4 has a drain. device.

As shown in FIG. 2 and FIG. 4 , the pulverizer 1 includes a body A, which has an inner chamber, the upper part of which is a grading chamber 12 , and the lower part is a crushing chamber 13 .

There is a cover plate on the top of the classification chamber 12, and the cover plate is made of castings; it reduces thermal stress deformation, improves the stability of the classifying impeller at high speed, improves product fineness and operating life;

The crushing chamber adopts a head structure; it not only reduces thermal stress deformation, improves the thermal stability of the crushing chamber and the overall equipment, but also avoids dead angles, improves heat exchange efficiency, and reduces condensation.

Several supersonic shrinking and expanding Laval nozzles 14 are evenly installed on the body A outside the crushing chamber 13; the Laval nozzles 14 are made of zirconia ceramic sintering; thermal stress deformation is reduced, and the nozzles are centered and converging Stability of crushing, increased output and reduced wear;

A Laval nozzle 14 is also installed on the bottom of the body A; the injection directions of several Laval nozzles 14 meet at the same central point in the crushing chamber 13 .

A high-pressure gas ring 11 for feeding high-temperature and high-pressure steam is provided outside the machine body A; the high-pressure gas ring 11 communicates with several Laval nozzles 14 .

The Laval nozzle 14 at the bottom of the machine body A and a plurality of horizontally distributed Laval nozzles 14 together form a nozzle group distributed in a three-dimensional space, which not only increases the probability of material collision and contact, improves the crushing efficiency, but also effectively prevents the bottom of the cavity from accumulating material, reducing cleaning time.

At least one classifying impeller 15 is installed in the classifying chamber 12, and a main shaft 16 is installed in the center hole of the classifying impeller 15, and the main shaft 16 is connected with the power transmission device in transmission.

The power transmission device includes a grading motor 17 installed on the top of the body A. One end of the main shaft 16 protrudes from the grading cavity 12 and an impeller bearing seat 18 is installed, and a bearing 19 is installed between the main shaft 16 and the impeller bearing seat 18 .

The grading impeller 15 is rotated by the main shaft 16, and the impeller bearing seat 18 is placed outside the grading chamber 12, separated from the high-temperature inner chamber, and the distance is relatively long, which greatly improves the working environment of the bearing, so that the ordinary bearing can be milled in the superheated steam flow normal use in the system.

Embodiment 2. In this embodiment, there are multiple grading impellers in the inner cavity of the pulverizer body. According to the different installation methods of the grading impellers, in the superheated steam airflow pulverizer, the grading impellers can be set as horizontal machines, as shown in Figure 5 As shown, a plurality of grading impellers 15 and a grading motor 17 and its transmission system are horizontally arranged in the grading chamber 12.

Embodiment 3: As shown in Figure 6, the grading impeller can be set as a vertical machine arranged vertically. The grading impeller 15 and the grading motor 17 and its transmission system are vertically arranged in the grading cavity 12 .

The basic principles and main features of the present utility model and the advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. On the premise of not departing from the spirit and scope of the utility model, the utility model also has various changes and improvements, and these changes and improvements all fall into the Into the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (10)

1. A superheated steam airflow crushing device, characterized in that: according to the flow direction of the material, the crushing device includes a material conveying device, a material crushing device and a material collecting device connected through pipelines in sequence, and the material crushing device adopts superheated steam airflow crushing machine (1). 2. A kind of superheated steam jet crushing device according to claim 1, characterized in that: The superheated steam jet pulverizer (1) includes a body (A), which has an inner cavity, the upper part of the inner cavity is a grading cavity (12), and the lower part is a crushing cavity (13); the grading cavity (12) is equipped with At least one classifying impeller (15). 3. A kind of superheated steam jet milling device according to claim 2, characterized in that: The grading impeller (15) is horizontally arranged in the grading cavity (12). 4. A kind of superheated steam jet crushing device according to claim 2, characterized in that: The grading impeller (15) is longitudinally arranged in the grading cavity (12). 5. A superheated steam airflow crushing device according to claim 3 or 4, characterized in that: a main shaft (16) is installed in the central hole of the classifying impeller (15), and the main shaft (16) is connected to the power transmission device through transmission. 6. A kind of superheated steam jet crushing device according to claim 5, characterized in that: The material conveying device includes a feeding device (2), which is used to convey the material to the superheated steam jet pulverizer (1). 7. A kind of superheated steam jet crushing device according to claim 6, characterized in that: The material collection device includes a bag filter (3), an insulation device (31) is installed on the upper part of the bag filter (3), and an electric heating device (32) is installed on the lower vertebral body. 8. A kind of superheated steam jet crushing device according to claim 7, characterized in that: The superheated steam jet mill (1) feed port is connected to the feed device (2), and its discharge port is connected to the bag filter (3). The upper part of the bag filter (3) is equipped with an induced fan (4). The lower end of the air outlet duct of the blower fan (4) is provided with a draining device. 9. A superheated steam jet crushing device according to claim 2, characterized in that: Several supersonic shrinking and expanding Laval nozzles (14) are uniformly installed on the body (A) outside the crushing chamber (13); a Laval nozzle (14) is also installed on the bottom of the body (A) ( 14); the injection directions of several Laval nozzles (14) meet at the same central point in the crushing chamber (13). 10. A superheated steam jet crushing device according to claim 9, characterized in that: A high-pressure gas ring (11) for feeding high-temperature and high-pressure steam is provided outside the machine body (A); the high-pressure gas ring (11) communicates with several Laval nozzles (14).