CN108179240B

CN108179240B - Secondary granulating rotor for molten slag

Info

Publication number: CN108179240B
Application number: CN201810233732.3A
Authority: CN
Inventors: 张玉华; 王孝义; 王博; 张维
Original assignee: Anhui University of Technology AHUT
Current assignee: Anhui University of Technology AHUT
Priority date: 2018-03-21
Filing date: 2018-03-21
Publication date: 2020-01-03
Anticipated expiration: 2038-03-21
Also published as: CN108179240A

Abstract

The invention provides a secondary slag granulation rotor, and belongs to the technical field of metallurgy and power machinery. The turbine shell plate, the bearing seat, the transition plate, the hollow pipe, the nozzle and the bracket are fixedly connected to form an axisymmetric rotor body which is supported on a static fixed shaft by a bearing and can rotate around the fixed shaft; the turbine, the screw and the gear are fixedly connected to form an axisymmetric rotating body which is supported on a bearing seat by a bearing and can rotate around the axis of the rotor body relative to the rotor body. A high-speed high-temperature mixture composed of water, slag and steam enters from an inlet of a volute disc, collides with fixed blades and turbine radial blades in the volute to change the direction and moves along the axial direction of a screw rod, and is finally sprayed out from a nozzle at the lower part of a rotor body to do work outwards, and meanwhile kinetic energy absorbed by the turbine does work outwards through a gear. The rotor of the invention is a key device for changing the existing slag granulation process, the waste heat energy utilization rate of the slag is high, the granulation effect is good, the device structure is compact, and the invention has important application prospect in slag granulation.

Description

Secondary granulating rotor for molten slag

Technical Field

The invention belongs to the technical field of metallurgy and power machinery, and particularly relates to a secondary slag granulation rotor.

Background

A large amount of high-temperature waste slag is generated in the ferrous metallurgy process, and the high-temperature waste slag mainly comprises blast furnace slag and steel slag (slag for short). Wherein the temperature of the blast furnace slag is about 1450 ℃, the enthalpy is about 1700MJ/t, the temperature of the steel slag is about 1450-1650 ℃, the enthalpy is about 1670MJ/t, and the blast furnace slag and the steel slag belong to high-quality waste heat resources and have high recovery value. The blast furnace slag forms crystal phase when cooled slowly and forms glass phase when cooled rapidly, and the glass state blast furnace slag obtained by quenching treatment has good hydraulic activity and can be used as a cement raw material. Therefore, most blast furnace slag at present adopts a water quenching granulation process (water quenching method for short), such as a pizza (Rasa) method, an InBA (INBA) method, a Tyna (Tyna) method and the like, and slag treatment equipment corresponding to the processes has simple structure and small investment, can meet the requirement of slag treatment capacity of blast furnace production, but has the defects of high consumption of new water, incapability of recovering slag waste heat and large system maintenance workload; and during grinding, the wet slag is dried, and energy is still consumed.

Disclosure of Invention

The invention aims to provide a molten slag secondary granulation rotor, which solves the defects in the existing blast furnace slag granulation treatment and obtains a key molten slag secondary granulation device with high molten slag waste heat utilization rate, good granulation effect, high granulation efficiency, low water resource consumption and high adaptation rotating speed.

The invention is realized by the following technical scheme.

The invention relates to a slag secondary granulation rotor, which comprises a volute plate, a bearing seat, a gear, a gasket, a turbine, a transition plate, a screw, a hollow pipe, a nozzle, a bracket and a fixed shaft; the volute plate is of an axisymmetric structure, a slag vapor inlet and a cooling water inlet are formed in the inner cylindrical surface of the volute plate, axial cylindrical holes are uniformly distributed in the circumference of the volute plate, a radial spiral groove in the lower end part of the volute plate is communicated with a volute groove in the lower part of the cylindrical hole to form a feeding groove, and a fixed blade 1c is arranged in the volute groove; the transition disc is an axisymmetric disc, the axes of cylindrical holes uniformly distributed on the circumference are coincident with the axes of cylindrical holes on the scroll disc, the diameters of the cylindrical holes are equal, the upper end surface and the lower end surface of the transition disc are planes, and the upper end surface is jointed with the lower end surface of the scroll disc to form a feed channel 1b and a turbine cavity 1 a; the support is an assembly with an axisymmetric structure, an upper disc and a lower disc with the same outer diameter are fixedly connected with a hollow cylinder at the center, reinforcing ribs are uniformly distributed around the hollow cylinder to reinforce the upper disc and the lower disc, cylindrical holes uniformly distributed on the circumferences of the upper disc and the lower disc are fixedly connected with the upper end and the lower end of the hollow pipe, the upper end surface of the upper disc is uniformly contacted with the lower end surface of a transition disc, a nozzle is fixedly arranged on the lower end surface of the lower disc, the transition disc and a volute disc are sequentially and coaxially arranged on the support, and a rigid rotor body is formed by fastening and connecting bolts and nuts; the bracket is supported on a static fixed shaft by a bearing, and the axis of the fixed shaft is vertically arranged; the nozzle is provided with a turning channel, the included angle of the inlet axis and the outlet axis of the nozzle in the vertical plane is more than 90 degrees, the diameter of the inlet is the same as that of the inner hole of the hollow pipe, the nozzle is fixedly arranged at the lower part of the bracket, and the projection included angle of the radial line of the outlet axis and the radial line of the inlet axis in the horizontal plane is 90 degrees; the lower part of the screw is provided with a spiral blade, the upper part of the screw is provided with a stepped shaft, a turbine is fixedly connected above the blade, the top end of the screw is fixedly connected with a gear, and the screw is supported on a bearing seat by a bearing; the axes of the turbine and the gear are superposed with the axis of the screw and fixedly connected with each other; the turbine is positioned in the turbine cavity 1a, and the part with the blade part of the screw is positioned in the inner cylindrical hole of the hollow pipe; the bearing seat is of an axisymmetrical structure and is fixedly arranged on the circumference of the volute plate, the outer cylindrical surface of the bearing seat is matched with the cylindrical hole of the volute plate, and the inner hole of the bearing seat is provided with a bearing for supporting the screw rod; the wear-resistant gasket fixedly connected with the lower end face of the bearing seat is contacted with the upper end face of the turbine so as to bear the axial force of the turbine; a stepped hole at the lower part of the bearing seat, the shaft diameter of the screw and the upper end surface of the turbine form a water storage cavity, the water storage cavity is communicated with a cooling water inlet on the volute disc through a radial hole to form a water inlet channel 1d, and a sealing ring is arranged between an inner hole in the middle part of the bearing seat and the shaft diameter of the screw; the turbine is of an axisymmetric structure, the turbine hub is fixedly connected with the screw, an axial through hole is formed between the two blades on the circumference of the turbine hub and is connected with the water storage cavity, the upper end face of the turbine is in uniform contact with the gasket to form a water lubrication thrust bearing, and the spiral radial blades are uniformly distributed along the circumference of the turbine hub.

The spiral direction of the spiral groove of the scroll plate can be left-handed or right-handed, but must be opposite to the rotation direction of the scroll plate; the width of the spiral groove is constant or increases with increasing radius, and the height of the groove decreases with increasing radius.

The number N of the feed channel 1b and the water inlet channel 1d of the volute plate is the same, the number of the turbines, the screws, the bearing seats, the gears, the hollow pipes and the nozzles is also N, and N is 2-10.

The volute plate, the transition plate, the turbine, the screw, the hollow pipe and the nozzle are made of high-temperature-resistant and wear-resistant materials.

The hollow pipe is a round pipe with uniform wall thickness, and the stepped steps at the lower end of the hollow pipe are matched with the upper end surface and the inner hole of the lower disc of the bracket to perform axial and radial positioning.

The end face of the gasket, which is in contact with the turbine, is provided with a friction-reducing annular groove.

Compared with the prior art, the invention has the following technical effects:

1. the waste heat utilization rate is high, and the granulation effect is good. High-speed water slag steam flow enters from an inlet of a volute disc, collides with a fixed blade and a radial turbine blade in the volute for two times and then moves along the axial direction of a screw, is sprayed out from a nozzle at the lower part of a rotor body to do work outwards, meanwhile, kinetic energy absorbed by a turbine does work outwards through a gear, slag particles in two collisions are smaller, and heat exchange between the slag steam is faster.

2. High granulation efficiency and low resource consumption. The fine slag particles after secondary collision have high heat exchange efficiency in the screw cavity, new water consumed by completely vaporizing water is less, and low-pressure water vapor discharged by the nozzle can be recycled.

3. The dynamic balance performance is good, the adaptive rotating speed is high, and the maintenance is convenient. Other parts of the rotor are of axisymmetric structures, and the channel structure is simple and easy to clean and maintain.

Drawings

FIG. 1 is a schematic front view of a rotor for secondary granulation of molten slag according to the present invention.

FIG. 2 is a schematic top view of a section C of a rotor for secondary granulation of molten slag according to the present invention.

FIG. 3 is a schematic view of the bottom structure of the K section of the rotor for secondary granulation of molten slag according to the present invention.

In the figure: 1: scroll plate, 1 a: turbine chamber, 1 b: feed channel, 1 c: fixed blade, 1 d: water inlet channel, 2: bearing seat, 3: shaft sleeve, 4: bearing, 5: gear, 6: sealing ring, 7: gasket, 8: turbine, 9: transition disc, 10: screw, 11: hollow tube, 12: nozzle, 13: support, 14: lower bearing, 15: fixed shaft, 16: upper bearing, 17: lower bolt, 18: a pressure plate, 19: bolt, 20: bolt mounting, 21: and a nut.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

In FIG. 1, a hollow tube 11 is connected with upper and lower disks of a bracket 13, a transition disk 9 and a volute disk 1 are coaxially arranged on the upper disk of the bracket 13 in sequence and are fastened and connected by a bolt 19 and a nut 21 to form a rigid rotor body; the bracket 13 is supported on a vertical fixed shaft 15 by an upper bearing 16 and a lower bearing 14, and the top end of the fixed shaft 15 is fixedly connected with a pressure plate 18 to form the axial positioning of the bracket 13; the nozzle 12 is fixedly mounted to the lower portion of the bracket 13 by a lower bolt 17.

A sealing ring 6 is arranged in an inner hole of a bearing seat 2, a gasket 7 is fixedly connected with the lower end part of the bearing seat, a screw 9 which is connected with a turbine 8 in a circumferential key way is supported in the inner hole of the bearing seat 2 by 2 bearings 4, a shaft sleeve 3 is arranged between the two bearings 4, and the top end of the screw 9 is fixedly connected with a cylindrical gear 5 to form a sub-component which can be integrally inserted; the sub-assembly is inserted into a cylindrical hole of the rotor body, and the bearing housing 2 and the volute disk 1 are fastened by the upper bolt 20.

In fig. 2 the 8 nozzles 12 are evenly distributed along the circumference of the rotor, the projection of the outlet axis of the nozzles 12 in a horizontal plane being tangential to the distribution circle of the nozzles.

In fig. 3, 8

water inlet channels

1d, 8

material inlet channels

1b and 8 turbines 8 are uniformly distributed along the circumference of the turbine disk 1, the turbines 8 are located in the turbine cavities 1a, and a plurality of fixed blades 1c are arranged in the volute grooves on the outer sides of the turbines 8.

The high-speed fluid mixed by water, slag and steam impacts the fixed blades 1c in the volute and the radial blades of the turbine 8 through the feeding channel 1b, one part of kinetic energy absorbed by the turbine 8 drives the screw 10 to rotate, and the other part of kinetic energy is meshed with gears outside the rotor through the cylindrical gears 5 on the rotor to drive the rotor to rotate. The finer slag particles after the two collisions change the movement direction, move downwards along the blades of the screw 10, perform secondary heat exchange in the hollow pipe, further reduce the temperature of the slag particles, further increase the temperature and pressure of steam, spray the mixture of high-pressure steam and particle slag from the nozzle 12 at the lower part of the rotor to do secondary work outwards, push the rotor to rotate at a high speed, and drive a generator set or other mechanical devices to work by the power obtained by the rotor through a transmission device.

Claims

1. A molten slag secondary granulation rotor is characterized in that: the granulation rotor comprises a volute plate (1), a bearing seat (2), a gear (5), a gasket (7), a turbine (8), a transition plate (9), a screw (10), a hollow pipe (11), a nozzle (12), a bracket (13) and a fixed shaft (15);

the turbine shell disc (1) is of an axisymmetric structure, a slag steam inlet and a cooling water inlet are arranged on the inner cylindrical surface of the turbine shell disc, axial cylindrical holes are uniformly distributed on the circumference, a radial spiral groove at the lower end part of the turbine shell disc (1) is communicated with a spiral groove at the lower part of the cylindrical hole to form a feeding groove, and a fixed blade (1c) is arranged in the spiral groove;

the transition disc (9) is an axisymmetric disc, the axes of cylindrical holes uniformly distributed on the circumference are coincident with the axes of the cylindrical holes on the volute disc (1), the diameters of the cylindrical holes are equal, the upper end surface and the lower end surface of the transition disc (9) are planes, and the upper end surface is jointed with the lower end surface of the volute disc (1) to form a feeding channel (1b) and a turbine cavity (1 a);

the support (13) is an assembly with an axisymmetric structure, an upper disc and a lower disc with the same outer diameter are fixedly connected with a hollow cylinder at the center, reinforcing ribs are uniformly distributed around the hollow cylinder to reinforce the upper disc and the lower disc, cylindrical holes are uniformly distributed on the circumferences of the upper disc and the lower disc and are fixedly connected with the upper end and the lower end of the hollow pipe (11), the upper end surface of the upper disc is uniformly contacted with the lower end surface of the transition disc (9), a nozzle (12) is fixedly arranged on the lower end surface of the lower disc, the transition disc (9) and the volute disc (1) are sequentially and coaxially arranged on the support (13), and a rigid rotor body is formed by fastening and connecting a bolt (19) and a nut (21); the bracket (13) is supported on a stationary fixed shaft (15) by an upper bearing (16) and a lower bearing (14), and the axis of the fixed shaft (15) is vertically arranged;

the nozzle (12) is provided with a turning channel, the included angle of the inlet axis and the outlet axis of the turning channel in the vertical plane is more than 90 degrees, the diameter of the inlet is the same as that of the inner hole of the hollow pipe (11), the nozzle (12) is fixedly arranged at the lower part of the bracket (13), and the projection included angle of the radial line of the outlet axis and the inlet axis in the horizontal plane is 90 degrees;

the lower part of the screw rod (10) is provided with a spiral blade, the upper part of the screw rod is provided with a stepped shaft, a turbine (8) is fixedly connected above the blade, the top end of the screw rod (10) is fixedly connected with a gear (5), and the screw rod (10) is supported on the bearing seat (2) by a bearing; the axes of the turbine (8) and the gear (5) are superposed with the axis of the screw (10) and fixedly connected with each other; the turbine (8) is positioned in the turbine cavity (1a), and the part with the blade of the screw (10) is positioned in an inner cylindrical hole of the hollow pipe (11);

the bearing seat (2) is of an axisymmetrical structure and is fixedly arranged on the circumference of the volute plate (1), the outer cylindrical surface of the bearing seat is matched with the cylindrical hole of the volute plate (1), and the inner hole of the bearing seat is provided with a bearing for supporting the screw rod (10); a gasket (7) fixedly connected with the lower end face of the bearing seat (2) is contacted with the upper end face of the turbine (8) to bear the axial force of the turbine (8); a stepped hole at the lower part of the bearing seat (2), the shaft diameter of the screw (10) and the upper end surface of the turbine (8) form a water storage cavity, the water storage cavity is communicated with a cooling water inlet on the turbine shell disc (1) through a radial hole to form a water inlet channel (1d), and a sealing ring is arranged between an inner hole in the middle part of the bearing seat (2) and the shaft diameter of the screw (10);

the turbine (8) is of an axisymmetric structure, the turbine hub is fixedly connected with the screw (10), an axial through hole is formed between the two blades on the circumference of the turbine hub and is connected with the water storage cavity, the upper end face of the turbine (8) is in uniform contact with the gasket (7) to form a water lubrication thrust bearing, and the spiral radial blades are uniformly distributed along the circumference of the turbine hub.

2. A rotor for secondary granulation of molten slag according to claim 1, characterized in that the spiral grooves of said scroll (1) are spiralled in the opposite direction to the rotation of the scroll (1); the width of the spiral groove is constant or increases with increasing radius, and the height of the groove decreases with increasing radius.

3. The secondary slag granulation rotor according to claim 1, wherein the number N of the feeding channels (1b) and the water inlet channels (1d) of the volute plate (1) is the same, and the number N of the turbine (8), the screw (10), the bearing seat (2), the gear (5), the hollow pipe (11) and the nozzle (12) is also 2-10.

4. The secondary slag granulation rotor according to claim 1, characterized in that said volute disks (1), transition disks (9), turbines (8), screws (10), hollow tubes (11) and nozzles (12) are made of a material resistant to high temperatures and to wear.

5. A rotor for secondary granulation of molten slag according to claim 1, characterized in that said hollow tube (11) is a round tube with uniform wall thickness, and the stepped step at its lower end is fitted with the upper end face and inner bore of the lower disc of the bracket (13) for axial and radial positioning.