Automatic deslagging device for coal injection mill

Abstract

The utility model discloses a kind of automatic deslagging devices of coal injection mill, including residue storage hopper, residue transport vehicle and control system;The top of residue storage hopper is connected with upper deslagging pipeline, and the deslagging port of coal injection mill is connected through upper deslagging pipeline;Upper deslagging valve is equipped on upper deslagging pipeline;Residue transport vehicle is located below residue storage hopper;The bottom of residue storage hopper is connected with lower deslagging pipeline, and the residue transport vehicle is communicated through lower deslagging pipeline;Lower deslagging valve is equipped on lower deslagging pipeline;The top of residue storage hopper is equipped with upper limit material level instrument;Control system includes control center, and upper deslagging valve, lower deslagging valve and upper limit material level instrument are electrically connected with control center.The automatic deslagging device of coal injection mill of the utility model has the advantages of simple structure, high degree of automation, reducing labor cost and error.

Description

Technical Field

[0001] This utility model relates to the field of pulverized coal mills, and in particular to an automatic slag discharge device for pulverized coal mills. Background Technology

[0002] Pulverized coal mills are used to grind raw coal into fine powder for use in blast furnace injection. Raw coal often contains impurities such as metal fragments and stones, which are difficult to grind. If these impurities accumulate in the mill, they will wear down the grinding parts and even damage the equipment; if they enter the combustion system, they may clog pipes, affect combustion efficiency, cause malfunctions or safety accidents, and increase pollutant emissions.

[0003] To avoid the aforementioned problems, the slag discharge function of the pulverized coal mill is crucial. Its role is to remove uncrushable impurities or large particles generated during mill operation, thereby maintaining the normal operation of the mill and the quality of the pulverized coal.

[0004] The existing slag discharge method for pulverized coal mills is as follows: the slag generated during the operation of the mill (i.e., impurities that cannot be ground or large particles) is discharged through the slag discharge port at the bottom of the mill. A slag box is set on the ground below the slag discharge port, and the slag falls into it. After the slag box is full, it is transferred to a slag truck by manual labor or by a conveying system driven by a drive device. Its disadvantages are: (1) manual transfer is labor-intensive and costly, and the conveying system has a complex structure; (2) the valve at the slag discharge port has no fault detection function, and valve failure can easily affect slag discharge and mill operation. Utility Model Content

[0005] The purpose of this utility model is to provide an automatic slag discharge device for a pulverized coal mill.

[0006] The technical solution to achieve the purpose of this utility model is: an automatic slag discharge device for a pulverized coal mill, comprising a slag storage hopper, a slag transport vehicle, and a control system;

[0007] The top of the slag hopper is connected to an upper slag discharge pipe, which is connected to the slag discharge port of the pulverized coal mill.

[0008] An upper slag discharge valve is installed on the upper slag discharge pipe. When the upper slag discharge valve is opened, the slag discharged from the pulverized coal mill enters the slag storage hopper through the upper slag discharge pipe.

[0009] The slag truck is located below the slag storage hopper;

[0010] The bottom of the slag hopper is connected to a lower slag discharge pipe, which is connected to the slag transport vehicle.

[0011] A lower slag discharge valve is installed on the lower slag discharge pipe. When the lower slag discharge valve is opened, the slag in the slag storage hopper enters the slag transport vehicle through the lower slag discharge pipe.

[0012] The top of the slag hopper is equipped with an upper limit level gauge;

[0013] The control system includes a control center, and the upper slag discharge valve, the lower slag discharge valve, and the upper limit level gauge are all electrically connected to the control center.

[0014] This invention features a lower slag discharge pipe and a slag transport vehicle sequentially positioned below the slag hopper. The slag transport vehicle receives the slag falling from the hopper. A lower slag discharge valve is installed on the lower slag discharge pipe. By alternately opening and closing the upper and lower slag discharge valves—for example, closing the lower valve and opening the upper valve—the slag discharged from the pulverized coal mill enters the slag hopper and is temporarily collected there. Opening the lower valve and closing the upper valve allows the slag in the hopper to be discharged and enter the slag transport vehicle. As the slag accumulates in the hopper, it isolates the grinding and slag discharge processes of the pulverized coal mill, thus preventing the mill's operating pressure from affecting the slag discharge. Simultaneously, when the lower valve is opened, the slag in the hopper is guided into the slag transport vehicle through the lower slag discharge pipe, eliminating the need for manual transfer or a drive device, resulting in a simpler structural design.

[0015] Furthermore, the upper slag discharge valve is a pneumatic slide gate valve. A first position detection device for detecting the open position of the upper slag discharge valve and a second position detection device for detecting the closed position of the upper slag discharge valve are installed along the gate's movement path. Both the first and second position detection devices are electrically connected to the control center. Specifically, a first limit rod is welded to the gate of the upper slag discharge valve, and a first transversely penetrating gate operating channel is provided on the upper slag discharge pipe. The first and second position detection devices are respectively installed on the outer wall of the upper slag discharge pipe at both ends of the first gate operating channel, and both are located along the movement path of the first limit rod. During operation, the gate of the upper slag discharge valve drives the first limit rod to move. When the first limit rod reaches the positions of the first and second position detection devices, the corresponding position detection devices are triggered and output open and closed signals, respectively. Furthermore, the control system also includes an alarm unit for timeout of opening and closing of the upper slag discharge valve, which is electrically connected to the control center.

[0016] Furthermore, the lower slag discharge valve is a pneumatic slide gate valve. A third position detection device for detecting the open position of the lower slag discharge valve and a fourth position detection device for detecting the closed position of the lower slag discharge valve are installed on the gate's movement path. Both the third and fourth position detection devices are electrically connected to the control center. Specifically, a second limiting rod is welded to the front end of the lower slag discharge valve's gate. A second gate operating channel is provided horizontally through the lower slag discharge pipeline. The third and fourth position detection devices are respectively installed on the outer wall of the lower slag discharge pipeline at both ends of the second gate operating channel, and both are located on the movement path of the second limiting rod. During operation, the gate of the lower slag discharge valve drives the second limiting rod to move. When the second limiting rod reaches the positions of the third and fourth position detection devices, the corresponding position detection devices are triggered and output open and closed signals, respectively. Furthermore, the control system also includes a timeout alarm unit for the lower slag discharge valve, which is electrically connected to the control center.

[0017] Furthermore, the control system also includes a material level signal abnormality alarm module, which is electrically connected to the control center. During operation, the material level signal abnormality alarm module can trigger an audio or flashing alarm when the upper material level gauge outputs a "material level height has reached the preset maximum threshold" signal, provided that the upper slag discharge valve is not fully open and the lower slag discharge valve is not fully closed.

[0018] Furthermore, the control system also includes an automatic / manual switching switch, which is electrically connected to the control center.

[0019] Furthermore, a transparent observation hole is provided on the side wall of the slag storage hopper.

[0020] Furthermore, the top of the slag hopper is covered with a slag dust cover to prevent dust from being generated when the slag is discharged into the slag hopper.

[0021] Furthermore, the top of the dump truck is covered with a dust cover to prevent dust from being generated when the slag is discharged into the dump truck.

[0022] The upper limit level gauge is preferably a rotary paddle level gauge, which has a simple structure, is easy to install, has excellent performance, and is inexpensive, making it cost-effective.

[0023] The automatic slag discharge device for pulverized coal mills disclosed in this application has the following technical advantages:

[0024] (1) High degree of automation: During normal production, the slag discharge device operates automatically throughout the entire process, which significantly reduces the need for manual operation and improves production efficiency;

[0025] (2) Reduce labor costs and errors: Reduce reliance on manual intervention, which saves labor costs and avoids the risk of failure caused by human error;

[0026] (3) Timely fault response: In case of abnormality, an alarm is automatically triggered to quickly notify personnel to handle the situation and avoid the fault from escalating or production from being interrupted;

[0027] (4) Intelligent switching ensures continuity: In case of failure, it automatically switches to manual mode to ensure that the production process is not interrupted and improves the system's fault tolerance and stability;

[0028] (5) Ease of maintenance: The automatic alarm function helps to accurately locate problems, shorten repair time, and optimize equipment maintenance process;

[0029] (6) Through the fully automatic operation and intelligent switching mechanism, the efficiency, reliability and safety of the production process have been upgraded. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the automatic slag discharge device for a pulverized coal mill according to an embodiment of the present invention;

[0031] Figure 2 This is a structural block diagram of the control system described in an embodiment of the present utility model. Detailed Implementation

[0032] The preferred embodiment of the automatic slag discharge device for pulverized coal mill of this utility model will be described in detail below with reference to the accompanying drawings.

[0033] Combination Figure 1 and Figure 2 An automatic slag discharge device for a pulverized coal mill includes a slag hopper 10, a slag transport vehicle 20, and a control system. The top of the slag hopper 10 is connected to an upper slag discharge pipe 30, which is connected to the slag discharge port 40 of the pulverized coal mill. An upper slag discharge valve 50 is installed on the upper slag discharge pipe 30. When the upper slag discharge valve 50 is opened, the slag discharged from the pulverized coal mill enters the slag hopper 10 through the upper slag discharge pipe 30. The slag transport vehicle 20 is located below the slag hopper 10. The bottom of the hopper is connected to a lower slag discharge pipe 60, which is connected to the slag transport vehicle 20. A lower slag discharge valve 70 is provided on the lower slag discharge pipe 60. When the lower slag discharge valve 70 is opened, the slag in the slag storage hopper 10 enters the slag transport vehicle 20 through the lower slag discharge pipe 60. An upper limit level gauge 80 is provided on the top of the slag storage hopper 10. The control system includes a control center, and the upper slag discharge valve 50, the lower slag discharge valve 70 and the upper limit level gauge 80 are all electrically connected to the control center.

[0034] The upper slag discharge valve 50 is a pneumatic slide gate valve. The upper slag discharge valve 50 is provided with a first position detection device 90 for detecting the open state of the gate 51 and a second position detection device 100 for detecting the closed state of the gate 51 on the moving path of the gate 51. The first position detection device 90 and the second position detection device 100 are electrically connected to the control center.

[0035] The lower slag discharge valve 70 is a pneumatic slide gate valve. A third position detection device 110 for detecting the open position of the gate 71 of the lower slag discharge valve and a fourth position detection device 120 for detecting the closed position of the gate 71 of the lower slag discharge valve are provided on the moving path of the gate 71 of the lower slag discharge valve. The third position detection device 110 and the fourth position detection device 120 are both electrically connected to the control center.

[0036] The upper limit level gauge 80 is a rotary paddle level gauge;

[0037] The control system is a PLC.

[0038] During operation, the slag (i.e., impurities that cannot be ground or large particles) generated during the operation of the pulverized coal mill is discharged from the slag discharge port 40 at the bottom of the mill and enters the slag storage hopper 10 through the upper slag discharge pipe 30. At this time, the lower slag discharge valve 70 is closed and the upper slag discharge valve 50 is open. As the slag accumulates in the slag storage hopper 10, the material level in the slag storage hopper 10 increases. The upper limit level gauge 80 in the slag storage hopper 10 is used to monitor the material level in the slag storage hopper 10 in real time and determine whether it has reached the preset maximum threshold. When the upper limit level gauge 80 detects that the material level has reached the preset maximum threshold, the lower slag discharge valve 70 is opened and the upper slag discharge valve 50 is closed. The slag in the slag storage hopper 10 enters the slag transport vehicle 20 through the lower slag discharge pipe 60. The upper slag discharge valve 50 and the lower slag discharge valve 70 are alternately opened and closed in the above manner to realize the automatic loading of slag into the hopper of the slag transport vehicle 20. Finally, the slag transport vehicle 20 transports the slag to the slag transfer station.

[0039] This invention avoids the impact of the mill's working pressure on slag discharge by alternating the opening and closing of the upper slag discharge valve 50 and the lower slag discharge valve 70; furthermore, the slag in the slag storage hopper 10 is transferred to the slag transport vehicle 20 without manual transfer or a drive device, resulting in a simpler structural design.

[0040] Preferably, such as Figure 2 As shown, the control system also includes an upper slag discharge valve opening / closing timeout alarm unit, which is electrically connected to the control center. During operation, the upper slag discharge valve opening / closing timeout alarm unit can trigger an audio or flashing alarm if the corresponding opening or closing signal of the upper slag discharge valve 50 is not fed back to the control center after a 5-second delay in the output of the open or closed signal.

[0041] Preferably, such as Figure 2 As shown, the control system also includes a lower slag discharge valve opening / closing timeout alarm unit, which is electrically connected to the control center. During operation, the lower slag discharge valve opening / closing timeout alarm unit can trigger an audio or flashing alarm if the corresponding opening or closing signal of the lower slag discharge valve 70 is not fed back to the control center after a 5-second delay in the output of the open or closed signal.

[0042] Preferably, such as Figure 2 As shown, the control system also includes a material level signal abnormality alarm module and an automatic / manual switching switch. Both the material level signal abnormality alarm module and the automatic / manual switching switch are electrically connected to the control center. During operation, if the mill stops working, or if the upper slag discharge valve 50, lower slag discharge valve 70, or upper limit material level gauge 80 malfunctions, the automatic / manual switching switch can be triggered, switching the automatic slag discharge device of the pulverized coal mill from automatic control to manual control.

[0043] like Figure 1 As shown, when the upper slag discharge valve 50 is a pneumatic slide gate valve, a first limiting rod 52 is welded to the gate 51 of the upper slag discharge valve 50. The upper slag discharge pipe 30 has a transversely penetrating first gate operating channel 31. The first position detection device 90 and the second position detection device 100 are respectively installed on the outer wall of the upper slag discharge pipe at both ends of the first gate operating channel 31, and both the first position detection device 90 and the second position detection device 100 are located on the moving path of the first limiting rod 52. During operation, the gate 51 of the upper slag discharge valve 50 drives the first limiting rod 52 to move. When the first limiting rod 52 moves to the positions of the first position detection device 90 and the second position detection device 100, the corresponding position detection devices are triggered and output open and closed signals, respectively.

[0044] like Figure 1 As shown, when the lower slag discharge valve 70 adopts a pneumatic slide gate valve, a second limiting rod 72 is welded to the gate 71 of the lower slag discharge valve 70. A second gate operating channel 61 is provided horizontally through the lower slag discharge pipe 60. The third position detection device 110 and the fourth position detection device 120 are respectively installed on the outer wall of the lower slag discharge pipe at both ends of the second gate operating channel 61, and both the third position detection device 110 and the fourth position detection device 120 are located on the moving path of the second limiting rod 72. During operation, the gate 71 of the lower slag discharge valve 70 drives the second limiting rod 72 to move. When the second limiting rod 72 moves to the positions of the third position detection device 110 and the fourth position detection device 120, the corresponding position detection devices are triggered and output open and closed signals, respectively.

[0045] Of course, the upper and lower slag discharge valves (50, 70) can be, but are not limited to, the pneumatic slide gate valves shown in the attached drawings, or other existing types of pipeline sealing valves. Similarly, the upper limit level gauge 80 can be, but is not limited to, a rotary paddle level gauge, or other existing types of level gauges.

[0046] Furthermore, such as Figure 1 As shown, the slag hopper 10 has a transparent observation hole 11 on its side wall.

[0047] Furthermore, the top of the slag hopper 10 is covered with a slag dust cover (a conventional structure, not shown), which creates a relatively sealed space inside the slag hopper 10. This prevents dust from being generated when slag is discharged into the slag hopper 10.

[0048] Furthermore, such as Figure 1 As shown, the top of the dump truck 20 is covered with a dust cover 21, which creates a relatively sealed space inside the dump truck to prevent dust from being generated when the slag is discharged into the dump truck.

[0049] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An automatic slag discharge device for a pulverized coal mill, comprising a slag hopper, a slag transport vehicle, and a control system; an upper slag discharge pipe is connected to the top of the slag hopper, and the upper slag discharge pipe is connected to the slag discharge port of the pulverized coal mill; an upper slag discharge valve is provided on the upper slag discharge pipe, and when the upper slag discharge valve is opened, the slag discharged from the pulverized coal mill enters the slag hopper through the upper slag discharge pipe; characterized in that: The slag truck is located below the slag storage hopper; The bottom of the slag hopper is connected to a lower slag discharge pipe, which is connected to the slag transport vehicle. A lower slag discharge valve is installed on the lower slag discharge pipe. When the lower slag discharge valve is opened, the slag in the slag storage hopper enters the slag transport vehicle through the lower slag discharge pipe. The top of the slag hopper is equipped with an upper limit level gauge; The control system includes a control center, and the upper slag discharge valve, the lower slag discharge valve, and the upper limit level gauge are all electrically connected to the control center.

2. The automatic slag discharge device for a pulverized coal mill according to claim 1, characterized in that: The upper slag discharge valve is a pneumatic slide gate valve. A first position detection device for detecting the gate of the upper slag discharge valve in the open position and a second position detection device for detecting the gate of the upper slag discharge valve in the closed position are provided on the gate movement path of the upper slag discharge valve. Both the first position detection device and the second position detection device are electrically connected to the control center.

3. The automatic slag discharge device for a pulverized coal mill according to claim 2, characterized in that: The gate of the upper slag discharge valve is welded with a first limiting rod, and the upper slag discharge pipe is provided with a first gate running channel that runs horizontally through it. The first position detection device and the second position detection device are respectively installed on the outer wall of the upper slag discharge pipe at the two ends of the first gate running channel, and the first position detection device and the second position detection device are both located on the moving path of the first limiting rod.

4. The automatic slag discharge device for a pulverized coal mill according to claim 2, characterized in that: The control system also includes an alarm unit for timeout of opening and closing of the upper slag discharge valve, which is electrically connected to the control center.

5. The automatic slag discharge device for a pulverized coal mill according to claim 1, characterized in that: The lower slag discharge valve is a pneumatic slide gate valve. A third position detection device for detecting the open position of the lower slag discharge valve gate and a fourth position detection device for detecting the closed position of the lower slag discharge valve gate are provided on the gate movement path of the lower slag discharge valve. Both the third position detection device and the fourth position detection device are electrically connected to the control center.

6. The automatic slag discharge device for a pulverized coal mill according to claim 5, characterized in that: The gate of the lower slag discharge valve is welded with a second limiting rod. The lower slag discharge pipe is provided with a second gate running channel that runs horizontally through it. The third position detection device and the fourth position detection device are respectively installed on the outer wall of the lower slag discharge pipe at the two ends of the second gate running channel, and the third position detection device and the fourth position detection device are both located on the moving path of the second limiting rod.

7. The automatic slag discharge device for a pulverized coal mill according to claim 5, characterized in that: The control system also includes a timeout alarm unit for the lower slag discharge valve, which is electrically connected to the control center.

8. The automatic slag discharge device for a pulverized coal mill according to claim 1, characterized in that: The upper limit level gauge is a rotary paddle level gauge; the control system also includes a level signal abnormality alarm module, which is electrically connected to the control center.

9. The automatic slag discharge device for a pulverized coal mill according to claim 1, characterized in that: The control system also includes an automatic / manual switching switch, which is electrically connected to the control center.

10. The automatic slag discharge device for a pulverized coal mill according to claim 1, characterized in that: The slag hopper is provided with a transparent observation hole on its side wall; the top of the slag hopper is covered with a slag dust cover; the top of the slag transport vehicle is covered with a slag transport dust cover.

Images