An air-cooled blast furnace distributor

Abstract

The present invention belongs to the technical field of air cooling of blast furnace distributors, and relates to an air-cooled blast furnace distributor, comprising a distributor body, a rotating cylinder rotatably connected to the distributor body, the rotating cylinder being provided with a cooling air duct and an air supply device; the air supply device being provided with an air inlet and an air outlet, the air inlet being communicated with the inner cavity of the distributor; one end of the cooling air duct being connected with the air outlet, and the other end being communicated with the inner cavity of the distributor. The present invention arranges an air supply device and a cooling air duct in the distributor, the air supply device accelerates the circulation of nitrogen in the distributor, and at the same time, through the cooling air duct, the cooling gas is directed into a designated position, thereby realizing local fixed-point cooling and improving cooling efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of air-cooling of blast furnace charge distributors and relates to an air-cooling blast furnace charge distributor. Background Art

[0002] The blast furnace has been using bell-less top distributors for nearly 50 years, which are often called "water-cooled gearboxes" or "airtight boxes" in China. There are currently many forms of distributors, and the common feature of these distributors is that they all have a rotating cylinder structure. The seals between the rotating cylinder and the fixed part of the distributor are sealed with nitrogen. At the same time, nitrogen can also be used as a cooling gas. The rotating cylinder is a key transmission component of the blast furnace distributor. The transmission parts on the rotating cylinder are in the distributor cavity and are eroded by the high-temperature gas of the blast furnace. If the rotating cylinder and the parts installed on it are not cooled, the heat deformation will cause the parts to fail.

[0003] In the traditional technology, cooling gas is introduced into the cavity of the distributor to cool the cavity of the distributor, but since the cooling gas cannot flow at high speed, its heat exchange efficiency is very low, and the distributor rotating cylinder and its parts cannot be effectively cooled. Later, a water cooling structure was adopted, such as the European patent with publication number EP0116142B1, which adopts an open water cooling method for cooling, that is, an annular water tank is set above the rotating cylinder, the water inlet is aligned with the water tank for water supply, and a water level gauge and other detection elements are set to monitor the water level of the annular water tank to prevent water from overflowing into the inner cavity of the distributor and the blast furnace. The bottom of the water tank is connected to the cooling part of the rotating cylinder, and the water flows down in the direction of gravity for cooling, and finally discharged into a fixed annular water tank at the bottom of the distributor and discharged to the outside of the distributor through a pipeline. However, it has the following defects: dust is easy to enter the cooling water circuit, and at the same time, due to the slow water flow speed, the cooling efficiency is low, the energy consumption is large, the water circuit is often scaled and blocked, the water tank is also seriously dusty, and the maintenance cost is also high.

[0004] Another example is the Chinese patent with publication number CN102483304B, which adopts an annular rotary joint, seals the original annular water tank structure, sets a fixed circuit and a rotating circuit, and sets a sealing structure between the fixed circuit and the rotating circuit, so that pressurized water can enter the rotating cylinder to cool the parts, and then return to the fixed circuit to form a closed water cooling. However, the closed water cooling has a complex structure and high cost. Summary of the invention

[0005] In view of this, the object of the present invention is to solve the problem of low cooling efficiency of the rotating drum of the existing distributor and to provide an air-cooled blast furnace distributor.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A kind of air-cooled blast furnace distributor, comprising a distributor body, a rotating cylinder rotatably connected to the distributor body, the rotating cylinder is provided with a cooling air duct and an air supply device; the air supply device is provided with an air inlet and an air outlet, the air inlet is communicated with the inner cavity of the distributor; one end of the cooling air duct is connected to the air outlet, and the other end is communicated with the inner cavity of the distributor.

[0008] This basic solution is achieved by arranging an air supply device and a cooling air duct on the rotating cylinder. The air supply device draws the cooling nitrogen from the distributor itself to accelerate the circulation of nitrogen in the inner cavity of the distributor. Since the rotating cylinder is a high-heat-generating component, the cooling nitrogen is directed into the rotating cylinder through the cooling air duct to cool it, thereby improving the cooling efficiency of the rotating cylinder. The air supply device can be rotated forward and reversely to achieve circulating cooling.

[0009] Furthermore, the air supply device includes a fan, a fan shaft, and a roller; the fan is arranged on a rotating cylinder; one end of the fan shaft is connected to the fan, and the other end is connected to the roller; an annular raceway is also provided in the inner cavity of the distributor; the roller is rollingly connected to the annular raceway and drives the fan shaft to rotate; the roller rolls on the annular roller, driving the fan shaft to rotate, thereby driving the fan to rotate.

[0010] Furthermore, the annular raceway is fixedly connected to the distributor body, and the roller is driven by the rotating drum to roll on the annular raceway; utilizing the relative rotation relationship between the rotating drum and the distributor body, the rotation of the rotating drum itself is used as power to drive the fan to rotate, without the need to provide a separate power source for the air supply device.

[0011] Furthermore, a power device is provided on the distributor body; the annular raceway is rotatably connected to the distributor body or the rotating drum; the power device is connected to the annular raceway and drives the annular raceway to rotate, and the annular raceway is driven by the power device to realize the rotation of the roller, thereby driving the fan to operate; the rotation direction of the annular raceway can be opposite to the rotation direction of the rotating drum, which can increase the rotation speed of the roller and accelerate the nitrogen circulation cooling.

[0012] Furthermore, the roller surface is a cylindrical surface or a drum surface or a tooth surface, and the shape of the annular raceway matches the roller; the raceway and roller surface can adopt friction-enhancing materials or structures, such as rubber material, and the surface adopts a knurled structure with pits.

[0013] Furthermore, the air supply device also includes a transmission, the fan shaft and the fan are connected through the transmission, and the transmission is fixedly connected to the rotating cylinder. The fan speed is increased through the transmission to accelerate the gas flow.

[0014] Furthermore, the distributor body includes a driving device and a fixed shell; the rotating drum is rotatably connected to the fixed shell; the driving device is arranged on the fixed shell and connected to the rotating drum to drive the rotating drum to rotate.

[0015] Furthermore, the cooling air duct is arranged on the outer wall of the rotating cylinder; a labyrinth structure is arranged in the cooling air duct; the labyrinth structure increases the contact area between the cooling gas and the rotating cylinder, thereby improving the cooling effect, and the labyrinth structure can improve the sealing performance.

[0016] Furthermore, a chute assembly is provided on the rotating cylinder, and the chute assembly includes a chute and an ear shaft; the ear shaft is fixedly connected to the chute, and the chute is arranged in the rotating cylinder and is rotatably connected to the rotating cylinder through the ear shaft; a cooling hole is provided in the ear shaft, and the cooling hole is connected to the air outlet through a pipeline; the cooling hole is communicated with the inner cavity of the distributor; the ear shaft has a high temperature due to the rotating motion, and the ear shaft is locally cooled by the air supply device.

[0017] Furthermore, the number of the air supply devices is at least one, and the number of the air supply devices can be adjusted according to actual needs to improve the cooling effect.

[0018] The beneficial effects of the present invention are:

[0019] 1) In the present invention, the cooling nitrogen in the inner cavity of the distributor is utilized, and the air supply device and the cooling air duct are used to force air cooling on the rotating cylinder. The cooling gas flows at high speed in the cooling air duct with a maze structure, thereby improving its heat exchange efficiency; and the circulation of the cooling nitrogen is accelerated, thereby improving the overall cooling efficiency of the distributor. And for the heat-prone parts, directional and fixed-point cooling is achieved, thereby improving the cooling effect.

[0020] 2) In the present invention, the fan power source can directly use the rotation of the rotating drum itself as power, without increasing the investment cost of the power source. The added components are conventional and simple, and the cost is also low. A separate power can also be used to drive the fan. When the rotating drum does not rotate, the fan can still operate normally.

[0021] 3) Compared with the existing water cooling structure, the present invention has a simple structure and is easy to implement.

[0022] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0024] Figure 1 It is a schematic diagram of the overall structure of the distributor in the present invention;

[0025] Figure 2 for Figure 1 AA partial cross-sectional view;

[0026] Figure 3 for Figure 1 A magnified view of part I;

[0027] Figure 4 for Figure 2 BB partial cross-sectional view;

[0028] Figure 5 It is a schematic diagram of the vertical arrangement of the rollers;

[0029] Figure 6 It is a schematic diagram of the vertical arrangement of the conical roller;

[0030] Figure 7 It is a schematic diagram of the horizontal arrangement of the conical roller;

[0031] Figure 8 Schematic diagram of the horizontal arrangement of drum rollers.

[0032] Figure markings: 1-distributor body; 2-rotating cylinder; 3-air supply device; 4-chute assembly; 5-maze structure; 6-nitrogen inlet; 7-driving device; 8-distributor cavity; 101-rotating drive gear; 102-rotating cylinder support; 103-tilting mechanism; 104-fixed shell; 105-fixed chassis; 201-rotating cylinder; 202-rotating cylinder chassis; 301-annular raceway; 302-roller; 303-input shaft; 304-transmission; 305-air inlet; 306-fan shaft; 307-fan; 308-air outlet; 309-air supply pipe; 310-cooling air duct; 311-cooling air duct outlet; 312-cooling hole; 401-ear shaft; 402-chute. DETAILED DESCRIPTION

[0033] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0034] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0035] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] Example 1

[0037] See also Figure 1 to Figure 4 , is an air-cooled blast furnace distributor, comprising a distributor body 1, on which a nitrogen port 6 is provided, a rotating drum 2 is provided with a cooling air duct 310 and an air supply device 3, on which an air inlet 305 and an air outlet 308 are provided, the air outlet 308 is communicated with the cooling air duct 310 through an air supply pipe 309, and the air inlet 305 is communicated with an inner cavity 8 of the distributor; wherein the distributor body 1 comprises a driving device 7, a fixed shell 104, and a rotating drum 2; the rotating drum 2 is rotationally connected to the fixed shell 104; the driving device 7 is installed on the fixed shell 104, and drives the rotating drum 2 to rotate by rotating the driving gear 101.

[0038] In this embodiment, the rotating cylinder 2 includes a rotating cylinder body 201 and a rotating cylinder chassis 202. The rotating cylinder body 201 is rotatably connected to the fixed shell 104 through a rotating cylinder support 102. The rotating cylinder chassis 202 is welded to the bottom of the rotating cylinder body 201. A cooling air duct 310 is installed on the rotating cylinder body 201 and the rotating cylinder chassis 202. A maze structure 5 is arranged in the middle of the cooling air duct 310. The cooling air duct outlet 311 is communicated with the inner cavity 8 of the distributor.

[0039] In this embodiment, the air supply device 3 includes a fan 307, a fan shaft 306, and a roller 302; the fan 307 is installed on the rotating drum chassis 202, one end of the fan shaft 306 is connected to the fan 307, and the other end is connected to the transmission 304, the roller 302 is fixedly installed on the input shaft 303 of the transmission 304, the transmission 304 is fixedly installed on the rotating drum 2, a fixed chassis 105 is welded to the lower part of the fixed shell 104, and an annular raceway 301 is fixedly installed on the fixed chassis 105, the roller 302 rolls with the annular raceway 301 and drives the fan shaft 306 to rotate.

[0040] See also Figures 5 to 8 In this embodiment, the surface of the roller 302 is a cylindrical surface, a drum surface or a tooth surface, and the shape of the annular raceway 301 matches the roller 302; a friction wheel transmission form is adopted between the roller 302 and the annular raceway 301, and the rolling motion between the roller 302 and the annular raceway 301 is achieved through friction resistance. There are also various arrangements, and the axis of the roller 302 is vertical or horizontal.

[0041] In this embodiment, a chute assembly 4 is also installed on the distributor body 1, and the chute assembly 4 includes a chute 402 and an ear shaft 401; the chute 402 is installed in the rotating cylinder 201, and is installed at the lower part of the rotating cylinder 201 through two ear shafts 401, and the driving device 7 drives the chute 402 to rotate around the central axis A1 of the ear shaft 401 at a limited angle through the tilting mechanism 103; a cooling hole 312 is provided on the ear shaft 401, and the cooling hole 312 is connected to the air outlet 308 through the air supply pipe 309 to cool the ear shaft 401; the cooling hole 312 is connected to the inner cavity 8 of the distributor.

[0042] Example 2

[0043] The difference between this embodiment and embodiment 1 is that the annular raceway 301 is rotatably mounted on the fixed chassis 105 via a slewing bearing, a gear is provided on the outer circle of the annular raceway 301, and a motor is also mounted on the fixed chassis 105, which drives the annular raceway 301 to rotate via the gear.

[0044] When the rotating drum 2 does not rotate, the annular raceway 301 can also be driven to rotate by the motor, thereby driving the roller 302 to rotate through friction, so that the fan 307 can be continuously operated.

[0045] Example 3

[0046] The difference between this embodiment and embodiment 2 is that the annular raceway 301 is rotatably mounted on the rotating drum 2 via a slewing bearing, a motor is mounted on the fixed chassis 105, and the motor drives the annular raceway 301 to rotate, thereby driving the roller 302 to rotate through friction, thereby achieving continuous operation of the fan 307.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A charge distributor for an air-cooled blast furnace, comprising a charge distributor body and a rotating drum rotatably connected to the charge distributor body, characterized in that: The rotating cylinder is provided with a cooling air duct and an air supply device; the air supply device is provided with an air inlet and an air outlet, and the air inlet is communicated with the inner cavity of the distributor; one end of the cooling air duct is connected to the air outlet, and the other end is communicated with the inner cavity of the distributor; the air supply device includes a fan, a fan shaft, and a roller; the fan is provided on the rotating cylinder; one end of the fan shaft is connected to the fan, and the other end is connected to the roller; an annular raceway is also provided in the inner cavity of the distributor; the roller is connected to the annular raceway in a rolling manner, and drives the fan shaft to rotate; The distributor body comprises a driving device and a fixed shell; the rotating drum is rotatably connected to the fixed shell; the driving device is arranged on the fixed shell and connected to the rotating drum to drive the rotating drum to rotate.

2. The air-cooled blast furnace distributor according to claim 1, characterized in that: The annular raceway is fixedly connected to the distributor body, and the roller is driven by the rotating drum to roll on the annular raceway.

3. The air-cooled blast furnace distributor according to claim 1, characterized in that: The distributor body is also provided with a power device; the annular raceway is rotationally connected with the distributor body or the rotating drum; the power device is connected with the annular raceway and drives the annular raceway to rotate.

4. The air-cooled blast furnace distributor according to claim 1, characterized in that: The roller surface is a cylindrical surface, a drum surface or a tooth surface, and the shape of the annular raceway matches the roller.

5. The air-cooled blast furnace distributor according to claim 1, characterized in that: The air supply device also includes a transmission, the fan shaft and the fan are connected through the transmission, and the transmission is fixedly connected to the rotating cylinder.

6. The air-cooled blast furnace distributor according to claim 1, characterized in that: The cooling air duct is arranged on the outer wall of the rotating cylinder; a labyrinth structure is arranged in the cooling air duct.

7. The air-cooled blast furnace distributor according to claim 1, characterized in that: The rotating drum is also provided with a chute assembly, which includes a chute and an ear shaft; the ear shaft is fixedly connected to the chute, the chute is arranged in the rotating drum, and is rotatably connected to the rotating drum through the ear shaft; a cooling hole is provided in the ear shaft, and the cooling hole is connected to the air outlet through a pipeline; the cooling hole is communicated with the inner cavity of the distributor.

8. The air-cooled blast furnace distributor according to claim 1, characterized in that: The number of the air supply device is at least one.

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