Laterite-nickel ore dust removal system and drying system

Abstract

The utility model relates to the technical field of ore processing, in particular to a dust removal system and a drying system for laterite-nickel ore. The utility model provides a laterite nickel ore dust removal system which comprises an induced draft fan, a dust remover, a conveying pipe, a spraying assembly and a cinder valve, one end of the conveying pipe is communicated with an air outlet of the dust remover, and the other end of the conveying pipe is communicated with an air inlet of the induced draft fan. An air inlet of the dust remover is communicated with an air outlet, close to a discharge port of the roller dryer, of the roller dryer; the conveying pipe comprises a horizontally arranged pipeline I and a vertically arranged pipeline II, the pipeline I is lower than the pipeline II, the bottom end of the pipeline I is communicated with one end of the pipeline II, and a bent part is formed at the joint of the pipeline I and the pipeline II. Accumulated dust and dirt do not need to be cleaned manually through tools, the labor burden of workers is relieved, shutdown for cleaning is not needed, the shutdown frequency is greatly reduced, and the productivity is released.

Description

Technical Field

[0001] The utility model relates to the technical field of ore processing, and particularly relates to a dust removal system and a drying system for laterite nickel ore. Background Art

[0002] Laterite nickel ore is a non-crystalline ore type with a relatively high moisture content, usually fluctuating within the range of 30-38%. This high moisture content poses challenges to subsequent processing and treatment processes. Therefore, drying treatment is required to reduce its moisture content for further processing.

[0003] As Figure 1 shown, in the laterite nickel ore drying system, a cyclone dust collector 4 and an induced draft fan 5 are used to remove dust from the tail discharge end of the rotary dryer 1. The induced draft fan 5 and the cyclone dust collector 4 are connected through a conveying pipe 6.

[0004] The soot entering the conveying pipe 6 sinks to the bending part 603 of the conveying pipe 6 in the vertical section of the conveying pipe. The soot is prone to ash accumulation in the bending part 603, and because the soot itself is relatively wet and easy to scale, the soot is prone to scale on the inner wall of the bending part 603, further resulting in mud accumulation on the inner wall of the bending part 603. Therefore, it is often necessary to stop the machine and open the sealing cover above the bending part 603, and then use tools to reach into the inside of the bending part 603 for cleaning, resulting in reduced production efficiency and heavy labor burden on personnel. Content of the Utility Model

[0005] (1) The problem to be solved by the utility model is that due to the ash accumulation and scaling prone to occur in the bending part of the conveying pipe, it is necessary to regularly stop the machine and use tools to reach into the inside of the bending part for cleaning, resulting in reduced production efficiency and heavy labor burden on personnel.

[0006] (2) Technical Solution

[0007] A dust removal system for laterite nickel ore includes an induced draft fan, a dust collector, a conveying pipe, a spraying assembly and a dust discharge valve. One end of the conveying pipe is connected to the air outlet of the dust collector, and the other end is connected to the air inlet of the induced draft fan. The air inlet of the dust collector is connected to the air outlet of the rotary dryer near its discharge port;

[0008] The conveying pipe includes a horizontally arranged pipe 1 and a vertically arranged pipe 2. The pipe 1 is lower than the pipe 2. The bottom end of the pipe 1 is connected to one end of the pipe 2. A bending part is formed at the connection of the pipe 1 and the pipe 2; A dust discharge port is opened at one end of the pipe 1 near the bending part, and the dust discharge valve is hermetically connected to the dust discharge port;

[0009] The spray assembly includes at least one spray head and a water supply mechanism. The spray head is disposed inside the bent portion for flushing the inner wall of the bent portion, and the water supply mechanism is connected to the spray head for pumping water into the spray head.

[0010] According to an embodiment of the present invention, the spray head includes a first spray head and a second spray head. The first spray head is higher than the second spray head. The first spray head is disposed at one end of the second pipe close to the bent portion, and the second spray head is disposed inside the bent portion.

[0011] According to an embodiment of the present invention, the first spray head includes a first annular pipe in a circular ring shape and a plurality of first spray nozzles. The first annular pipe is provided with a plurality of water outlets around its axis, and at least one of the first spray nozzles is disposed in each of the water outlets. The water outlet end of the first spray nozzle points to the inner wall of the bent portion.

[0012] According to an embodiment of the present invention, the second spray head includes a second annular pipe in a circular ring shape and a plurality of second spray nozzles connected to the second annular pipe. The second annular pipe is disposed in the middle of the bent portion, and the plurality of second spray nozzles are distributed around the axis of the second annular pipe. The water outlet end of each of the second spray nozzles points to the inner wall of the bent portion.

[0013] According to an embodiment of the present invention, the water supply mechanism includes a water pump, a main water outlet pipe, and a branch water outlet pipe. One end of the main water outlet pipe is connected to the water outlet of the water pump, and the other end thereof is connected to the first annular pipe. One end of the branch water outlet pipe is connected to the main water outlet pipe, and the other end thereof is connected to the second annular pipe. At least one valve body for controlling its on-off is provided on the main water outlet pipe.

[0014] According to an embodiment of the present invention, the first annular pipe is coaxially disposed with the second pipe, and an included angle is formed between the axis of the first spray nozzle and the axis of the first annular pipe.

[0015] According to an embodiment of the present invention, the laterite nickel ore dust removal system includes a controller, and the valve body and the water pump are respectively connected to the controller in a signal manner.

[0016] According to an embodiment of the present invention, the laterite nickel ore dust removal system further includes a bag filter. The ash inlet of the bag filter is connected with an ash inlet pipe, and one end of the ash inlet pipe far away from the bag filter is connected with an ash collecting hood. The ash collecting hood is located directly above the feed inlet of the rotary dryer.

[0017] According to an embodiment of the present invention, the laterite nickel ore dust removal system includes a water mist dust collector. The ash inlet of the water mist dust collector is connected to the air outlet of the induced draft fan through a pipe.

[0018] A laterite nickel ore drying system includes the above-mentioned laterite nickel ore dust removal system.

[0019] Advantages of the present utility model:

[0020] A laterite nickel ore dust removal system provided by the present utility model includes an induced draft fan, a dust collector, a conveying pipe, a spraying assembly and a dust discharging valve. One end of the conveying pipe is communicated with the air outlet of the dust collector, and the other end is communicated with the air inlet of the induced draft fan. The air inlet of the dust collector is communicated with the air outlet of the drum dryer near its discharge port; the conveying pipe includes a connected pipe one and pipe two. Pipe one is lower than pipe two, pipe one is perpendicular to pipe two, and a bending part is formed at the connection of pipe one and pipe two; a dust discharging port is opened at one end of pipe one near the bending part, and the dust discharging valve is hermetically connected to the dust discharging port; the spraying assembly includes at least one spray head and a water supply mechanism. The spray head is arranged inside the bending part for flushing the inner wall of the bending part, and the water supply mechanism is communicated with the spray head for pumping water into the spray head.

[0021] When cleaning the bending part, open the dust discharging valve and the spraying assembly. The water supply mechanism pumps water into the spray head, and the spray head sprays water flow towards the inner wall of the bending part to flush the inside of the bending part, washing away the accumulated dust and dirt on the inner wall. At the same time, large particle dust in the smoke is adsorbed and settled by water droplets, and the mixture of water and ash is discharged through the dust discharging valve. In this way, there is no need for manual cleaning of the accumulated dust and dirt with tools, which reduces the labor burden of workers, and there is no need to stop the machine for cleaning, greatly reducing the number of stops and releasing the production capacity. Description of the drawings

[0022] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the existing laterite nickel ore drying system;

[0024] Figure 2 It is the structural diagram provided by the embodiment of the present utility model;

[0025] Figure 3 It is the front view of the conveying pipe and the spraying assembly provided by the embodiment of the present utility model;

[0026] Figure 4 It is the cross-sectional view of the conveying pipe and the spraying assembly provided by the embodiment of the present utility model.

[0027] Icons: 1. Drum dryer; 101. Feed inlet; 102. Discharge outlet; 2. Bag filter; 201. Ash inlet pipe; 3. Hot blast stove; 4. Cyclone dust collector; 5. Induced draft fan; 6. Conveyor pipe; 601. Pipe one; 602. Pipe two; 603. Bending part; 7. Ash discharge valve; 8. Spraying assembly; 801. First ring pipe; 802. Second ring pipe; 803. Main water outlet pipe; 804. Water outlet branch pipe; 805. Valve body; 806. Water pump; 807. First spray head; 808. Second spray head; 809. Water inlet pipe; 9. Water mist dust collector. Detailed implementation mode

[0028] The technical solution of the present utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work belong to the scope of protection of the present utility model.

[0029] Embodiment 1:

[0030] As Figures 2 - 4 shown, Embodiment 1 of the present utility model provides a laterite nickel ore dust removal system, which includes an induced draft fan 5, a dust collector, a conveyor pipe 6, a spraying assembly 8 and an ash discharge valve 7. One end of the conveyor pipe 6 is communicated with the air outlet of the dust collector, and the other end is communicated with the air inlet of the induced draft fan 5. The air inlet of the dust collector is communicated with the air outlet of the drum dryer 1 near its discharge outlet 102;

[0031] The conveyor pipe 6 includes a horizontally arranged pipe one 601 and a vertically arranged pipe two 602. The pipe one 601 is lower than the pipe two 602. The bottom end of the pipe one 601 is communicated with one end of the pipe two 602. A bending part 603 is formed at the connection of the pipe one 601 and the pipe two 602; A dust discharge port is opened at one end of the pipe one 601 near the bending part 603, and the ash discharge valve 7 is hermetically connected to the dust discharge port;

[0032] The spraying assembly 8 includes at least one spray head and a water supply mechanism. The spray head is arranged inside the bending part 603 for flushing the inner wall of the bending part 603, and the water supply mechanism is communicated with the spray head for pumping water into the spray head.

[0033] In this embodiment, when cleaning the bent portion 603, the ash discharge valve 7 is opened, and the spray assembly 8 is opened. The water supply mechanism pumps water into the spray head, and the spray head sprays water flow onto the inner wall of the bent portion 603 to wash the inside of the bent portion 603, washing away the accumulated ash and dirt on the inner wall of the bent portion 603. At the same time, the large particulate dust in the smoke is adsorbed and settled by the water droplets, and the mixture of water and ash is discharged through the ash discharge valve 7. In this way, there is no need for manual cleaning of the accumulated ash and dirt with tools, which reduces the labor burden of workers, and there is no need to stop the machine for cleaning, greatly reducing the number of stops and releasing the production capacity. Moreover, since the cleaning effect of using the flushing method to clean the accumulated ash and dirt is good, the maintenance frequency can be reduced and the maintenance cycle can be extended.

[0034] As a preferred embodiment, in order to maximize the cleaning effect, as Figure 4 shown, there are two spray heads, namely the first spray head and the second spray head in sequence. The first spray head is higher than the second spray head. The first spray head is coaxially arranged with the second pipe 602 and is close to the top end of the bent portion 603. The second spray head is centrally located inside the bent portion 603 and close to its lowest point. The second spray head is inclined, and the water outlet of the second spray head is directly facing the inner wall of the bent portion 603. The water supply mechanism supplies water to both the first spray head and the second spray head at the same time. The water flow sprayed by the first spray head is aligned with the inner wall of the top of the bent portion 603, and the second spray head is directly facing the middle of the bent portion 603 for flushing. In this way, by using the first spray head and the second spray head to simultaneously flush different positions of the bent portion 603, the accumulated ash and dirt inside the bent portion 603 can be effectively cleaned, improving the cleaning efficiency.

[0035] As a specific embodiment, as Figure 4 shown, the first spray head includes a circular first ring pipe 801 and a plurality of first nozzles 807. The first ring pipe 801 is evenly provided with a plurality of water outlets around its axis, and each water outlet is hermetically installed with a first nozzle 807. The axis of the first ring pipe 801 is collinear with the axis of the second pipe 602, and the first ring pipe 801 is close to the top position of the bent portion 603. It should be noted that the first nozzle 807 is inclined, and it is necessary to ensure that the first nozzle 807 points to the inner wall of the bent portion 603, that is, the water flow sprayed by the first nozzle 807 is obliquely downward. The water flow sprayed by the first nozzle 807 washes away the dirt and accumulated ash on the inner wall near the top of the bent portion 603 for the first time, and then the water flow flows along the inner wall of the bent portion 603 to further clean the area below the bent portion 603.

[0036] Further, the second spray head includes a second annular pipe 802 in a circular ring shape and a plurality of second spray nozzles 808 connected to the second annular pipe 802. The plurality of second spray nozzles 808 are evenly distributed around the axis of the second annular pipe 802. The second annular pipe 802 is centrally provided with a bending portion 603. It should be noted that a plurality of water outlet ports are provided on the outer side surface of the second annular pipe 802, and the second spray nozzles 808 are installed in the water outlet ports on the outer side surface of the second annular pipe 802, so that the second spray nozzles 808 are arranged along the radial direction of the second annular pipe 802. It should be noted that generally, there is more dust accumulation at the lowest point of the bending portion 603. By arranging the second spray nozzles 808 near its lowest point, the second spray nozzles 808 can flush the lowest point of the bending portion 603, cleaning the dust and dirt inside the bending portion 603 to the greatest extent and ensuring the cleaning effect.

[0037] In this embodiment, the combined use of the first spray head and the second spray head has a good cleaning effect on removing dust and dirt, so the maintenance frequency can be reduced and the maintenance cycle can be extended.

[0038] It should be noted that the water supply mechanism includes a water pump 806, a main water outlet pipe 803, a water outlet branch pipe 804 and a water inlet pipe 809. Among them, one end of the main water outlet pipe 803 is connected to the water outlet of the water pump 806, and the other end is connected to the first annular pipe 801. One end of the water inlet pipe 809 is connected to the water inlet of the water pump 806, and the other end is connected to the water supply pipeline. A water outlet port is provided on the outer wall of the main water outlet pipe 803. One end of the water outlet branch pipe 804 is connected to the water outlet port on the outer wall of the main water outlet pipe 803, and the other end is connected to the second annular pipe 802. A valve body 805 is provided on the main water outlet pipe 803, and the valve body 805 is an electric valve.

[0039] As Figure 4 shown, the valve body 805 is lower than the water outlet branch pipe 804. In this way, when the valve body 805 is closed, both the first spray head and the second spray head stop supplying water.

[0040] As a preferred embodiment, in the past, the conveying pipe 6 needed to be cleaned of ash regularly, but there was a phenomenon that workers forgot to clean the ash, resulting in excessive ash accumulation in the conveying pipe 6. To avoid such problems, a controller is provided in this embodiment. The controller is signal-connected to the water pump 806, the ash discharge valve 7 and the valve body 805. A dust cleaning program is entered into the controller. Every once in a while, the controller automatically opens the water pump 806, the ash discharge valve 7 and the valve body 805 to automatically carry out the dust cleaning work.

[0041] It should be noted that in this embodiment, the dust collector is a cyclone dust collector 4. A water mist dust collector 9 is arranged on the side of the induced draft fan 5 away from the cyclone dust collector 4. The ash inlet of the water mist dust collector 9 and the air outlet of the induced draft fan 5 are connected through a pipeline. The water mist dust collector 9 is used to further remove dust from the soot, further improving the dust removal effect.

[0042] Preferably, as Figure 2 shown, the dust removal system further includes a bag filter 2. The ash inlet of the bag filter 2 is connected to an ash inlet pipe 201. One end of the ash inlet pipe 201 away from the bag filter 2 is connected to an ash collection hood, and the ash collection hood is located directly above the feed inlet 101 of the drum dryer 1. The bag filter 2 is used to handle the dust generated during feeding.

[0043] Embodiment 2:

[0044] As Figure 2 shown, Embodiment 2 of the present invention provides a laterite nickel ore drying system. The drying system includes a drum dryer 1, a hot blast stove 3, and the laterite nickel ore dust removal system in Embodiment 1 above. The left top of the drum dryer 1 is provided with a feed inlet 101, and the bottom of its tail end is provided with a discharge outlet 102. A hot blast stove 3 is arranged on the left side of the drum dryer 1, and the hot blast stove 3 is communicated with the drum dryer 1 for blowing hot air into the drum dryer 1.

[0045] It should be noted that the size of the discharge outlet 102 of this drum dryer 1 is 80 cm * 55 cm, and the size of the discharge outlet 102 of the previous drum dryer 1 was 160 cm * 55 cm. In this embodiment, the size of the discharge outlet 102 of the drum dryer 1 is reduced, reducing the amount of cold air entering, enabling the flue gas temperature at the drum outlet to be stably maintained above 80 °C, improving the drying capacity of the laterite nickel ore, and stabilizing the output.

[0046] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It 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 operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "communication", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct communication or an indirect communication through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In addition, in the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0048] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A laterite nickel ore dust removal system, characterized in that: It comprises an induced draft fan (5), a dust collector, a conveying pipe (6), a spray assembly (8) and an ash discharge valve (7), wherein one end of the conveying pipe (6) is connected to the air outlet of the dust collector, and the other end thereof is connected to the air inlet of the induced draft fan (5), and the air inlet of the dust collector is connected to the air outlet of the drum dryer (1) near its discharge port; The conveying pipe (6) comprises a horizontally arranged pipe 1 (601) and a vertically arranged pipe 2 (602); the pipe 1 (601) is lower than the pipe 2 (602); the bottom end of the pipe 1 (601) is connected to one end of the pipe 2 (602); a bending portion (603) is formed at the connection between the pipe 1 (601) and the pipe 2 (602); an ash discharge port is formed at one end of the pipe 1 (601) close to the bending portion (603); the ash discharge valve (7) is sealed and connected to the ash discharge port; The spray assembly (8) comprises at least one spray head and a water supply mechanism; the spray head is arranged inside the bending portion (603) and is used to flush the inner wall of the bending portion (603); the water supply mechanism is connected to the spray head and is used to pump water into the spray head.

2. A laterite nickel ore dust removal system according to claim 1, characterized in that: The spray head comprises a first spray head and a second spray head, wherein the first spray head is higher than the second spray head, the first spray head is arranged at one end of the second pipe (602) close to the bending portion (603), and the second spray head is arranged inside the bending portion (603).

3. A laterite nickel ore dust removal system according to claim 2, characterized in that: The first spray head comprises a first annular ring tube (801) and a plurality of first spray heads (807); the first annular ring tube (801) is provided with a plurality of water outlets around its axis, each of the water outlets is provided with at least one of the first spray heads (807); the water outlet end of the first spray head (807) points toward the inner wall of the bent portion (603).

4. A laterite nickel ore dust removal system according to claim 3, characterized in that: The second spray head comprises a second annular tube (802) in an annular shape and a plurality of second spray heads (808) connected to the second annular tube (802); the second annular tube (802) is centrally disposed within the bending portion (603); the plurality of second spray heads (808) are distributed around the axis of the second annular tube (802); and the water outlet end of each second spray head (808) points toward the inner wall of the bending portion (603).

5. A laterite nickel ore dust removal system according to claim 4, characterized in that: The water supply mechanism comprises a water pump (806), a water outlet main pipe (803) and a water outlet branch pipe (804); one end of the water outlet main pipe (803) is connected to the water outlet of the water pump (806), and the other end thereof is connected to the first ring pipe (801); one end of the water outlet branch pipe (804) is connected to the water outlet main pipe (803), and the other end thereof is connected to the second ring pipe (802); and the water outlet main pipe (803) is provided with at least one valve body (805) for controlling its on and off.

6. A laterite nickel ore dust removal system according to claim 3, characterized in that: The first annular tube (801) is coaxially arranged with the second pipe (602), and an angle is formed between the axis of the first nozzle (807) and the axis of the first annular tube (801).

7. A laterite nickel ore dust removal system according to claim 5, characterized in that: The laterite nickel ore dust removal system comprises a controller, and the valve body (805) and the water pump (806) are respectively connected to the controller signal.

8. The laterite nickel ore dust removal system according to claim 1, characterized in that: The laterite nickel ore dust removal system further comprises a bag dust collector (2), an ash inlet of the bag dust collector (2) being connected to an ash inlet pipe (201), an end of the ash inlet pipe (201) away from the bag dust collector (2) being connected to an ash collecting hood, and the ash collecting hood being located directly above the feed inlet (101) of the drum dryer (1).

9. A laterite nickel ore dust removal system according to claim 1, characterized in that: The laterite nickel ore dust removal system comprises a water mist dust collector (9), and an ash inlet of the water mist dust collector (9) and an air outlet of the induced draft fan (5) are connected via a pipeline.

10. A laterite nickel ore drying system, characterized in that: A laterite nickel ore dust removal system comprising any one of claims 1-9.

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