Safety device for slag discharge port of medium-speed coal mill

Abstract

The utility model relates to the technical field of coal mills, in particular to a safety device of a slag discharge port of a medium-speed coal mill, which comprises a slag discharge port box body, a purging device, a nitrogen tank, a nitrogen valve, a temperature sensor and a controller, the purging device is fixed at the bottom of the slag discharge port box body, and the nitrogen tank is connected to the bottom of the slag discharge port box body through a pipeline. A nitrogen valve is arranged on a pipeline connecting the nitrogen tank and the slag discharge port box body, and the temperature sensor is installed at the bottom of the slag discharge port box body and is in communication connection with the controller. The safety device has the capability of tracking high-temperature substances and pressure change at the slag discharge port in real time, and can immediately trigger an automatic cooling mechanism and effectively prevent potential safety hazards such as combustion, explosion and the like once abnormal conditions are monitored; the device is also integrated with a high-temperature protection and alarm function, so that a solid guarantee is provided for the safety of operators on duty, and timely response and measures can be ensured to be taken in an emergency.

Description

Technical Field

[0001] This utility model belongs to the technical field of medium-speed coal mills, and specifically relates to a safety device for the slag discharge port of a medium-speed coal mill. Background Technology

[0002] In the pulverized coal injection process of blast furnaces for ironmaking, the stable operation of medium-speed coal mills, as important coal powder preparation equipment, is crucial to the entire production process. However, during production, the slag discharge port of medium-speed coal mills often faces a series of safety hazards. These hazards mainly stem from the combustion and explosion phenomena that occur due to high temperature and oxidation reactions after difficult-to-grind materials such as coal slag, iron ore, and waste are ground for a long time in the coal mill.

[0003] Specifically, before entering the coal mill, bituminous coal often contains small amounts of iron ore, coal gangue, and other metallic impurities. These difficult-to-grind materials gradually increase in temperature during prolonged grinding inside the mill. When these materials accumulate in the slag discharge port, they react with the oxygen inside the mill, leading to spontaneous combustion. In recent years, with changes in the coal market, the combustion temperature of bituminous coal has decreased year by year, further exacerbating the safety hazards posed by the high-temperature objects in the slag discharge port to mill production.

[0004] To address this issue, the current industrial practice primarily involves regular manual inspections of the slag discharge ports of medium-speed coal mills to ensure timely removal of slag. However, this method not only increases the workload of on-duty personnel but also poses certain safety hazards. On the one hand, manual inspections are difficult to monitor in real time, potentially leading to missed inspections or misjudgments; on the other hand, on-duty personnel are prone to burns and other injuries when handling high-temperature slag. Utility Model Content

[0005] The purpose of this utility model is to provide a safety device for the slag discharge port of a medium-speed coal mill, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A safety device for the slag discharge port of a medium-speed coal mill includes a slag discharge port housing, a purging device, a nitrogen tank, a nitrogen valve, a temperature sensor, and a controller. The purging device is fixed to the bottom of the slag discharge port housing. The nitrogen tank is connected to the bottom of the slag discharge port housing via a pipeline. A nitrogen valve is provided on the pipeline connecting the nitrogen tank and the slag discharge port housing. The temperature sensor is installed at the bottom of the slag discharge port housing and is communicatively connected to the controller.

[0008] Preferably, it also includes a compressed air tank and an air valve. The compressed air tank is connected to the bottom of the slag discharge port box through a pipeline, and an air valve is provided on the pipeline connecting the compressed air tank and the slag discharge port box.

[0009] Preferably, the slag discharge port box includes a box body, an upper plate valve, a lower plate valve, a flue valve, and a vent valve. The upper part of the box body is connected to the mill inlet flue and the vent flue. A flue valve is provided on the mill inlet flue, and a vent valve is provided on the vent flue. The upper plate valve is connected to the upper part of the box body, and the lower plate valve is connected to the lower part of the box body.

[0010] Preferably, it also includes a pressure sensor, which is disposed on the upper part of the slag discharge port box and is communicatively connected to the controller.

[0011] Preferably, it also includes an alarm, which is communicatively connected to the controller.

[0012] Preferably, the purging device includes a housing, a nozzle, and nozzle holes. The housing is a flat plate structure with multiple nozzle holes, and the nozzle is installed inside each nozzle hole.

[0013] Compared with the prior art, the beneficial effects of this utility model are: improving the safety of coal mill operation and reducing the labor intensity of operators. This safety device has the ability to track the changes in high temperature substances and pressure at the slag discharge port in real time. Once an abnormal situation is detected, it can immediately trigger an automatic cooling mechanism to effectively prevent the occurrence of safety hazards such as combustion and explosion. In addition, the system also incorporates high temperature protection and alarm functions, providing a solid guarantee for the safety of on-duty personnel and ensuring timely response and measures in emergency situations. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the safety device of this utility model;

[0015] Figure 2 This is a schematic diagram of the overall structure of the purging device of this utility model.

[0016] In the diagram: 1. Slag discharge port box, 2. Purging device, 3. Nitrogen tank, 4. Nitrogen valve, 5. Temperature sensor, 6. Controller, 7. Compressed air tank, 8. Air valve, 9. Pressure sensor, 10. Alarm, 11. Box body, 12. Upper plate valve, 13. Lower plate valve, 14. Flue valve, 15. Venting valve, 21. Outer shell, 22. Nozzle, 23. Spray hole. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example:

[0019] Please see Figure 1 - Figure 2 As shown, this embodiment provides a safety device for the slag discharge port of a medium-speed coal mill, including a slag discharge port housing 1, a purging device 2, a nitrogen tank 3, a nitrogen valve 4, a temperature sensor 5, and a controller 6. The purging device 2 is fixed to the bottom of the slag discharge port housing 1, and the bottom surface of the slag discharge port housing 1 is inclined. The purging device 2 is parallel to the bottom surface of the slag discharge port housing 1 at a certain interval and can cover the entire bottom surface. The nitrogen tank 3 is connected to the bottom of the slag discharge port housing 1 through a pipeline. A nitrogen valve 4 is provided on the pipeline connecting the nitrogen tank 3 and the slag discharge port housing 1. The temperature sensor 5 is installed at the bottom of the slag discharge port housing 1 and is communicatively connected to the controller 6.

[0020] The slag discharge port box 1 includes a box body 11, an upper plate valve 12, a lower plate valve 13, a flue valve 14, and a vent valve 15. The upper part of the box body 11 is connected to the mill inlet flue and the vent flue. The mill inlet flue is equipped with a flue valve 14, and the vent flue is equipped with a vent valve 15. The upper plate valve 12 is connected to the upper part of the box body 1, and the lower plate valve 13 is connected to the lower part of the box body 11.

[0021] Temperature sensor 5 collects the temperature inside the slag discharge box 1. When the detected temperature reaches the upper limit of the set value, controller 6 controls the upper plate valve 12 to close, the flue valve 14 to open, and the nitrogen valve 4 to open. Nitrogen gas is sprayed out from nitrogen tank 3 through nitrogen pipeline and then through purging device 2. Because the box body 11 is under negative pressure, nitrogen gas is extracted from nitrogen tank 3. Low temperature nitrogen gas cools the coal block. Nitrogen gas is then recovered from the mill flue through flue gas valve 14.

[0022] The safety device for the slag discharge port of the medium-speed coal mill in this embodiment also includes a compressed air tank 7, an air valve 8, and a pressure sensor 9. The compressed air tank 7 is connected to the bottom of the slag discharge port housing 1 via a pipeline, and an air valve 8 is installed on the pipeline connecting the compressed air tank 7 and the slag discharge port housing 1. The pressure sensor 9 is located at the top of the slag discharge port housing 1 and is communicatively connected to the controller 6.

[0023] When the temperature detected by temperature sensor 5 reaches the lower limit of the set value, controller 6 controls nitrogen valve 4 to close, flue valve 14 to close, vent valve 14 to open, and air valve 8 to open. Air is released through compressed air tank 7 and air pipeline to discharge nitrogen in the main body 11 through vent valve 14 and vent flue, preventing workers from inhaling high concentrations of nitrogen and suffocating during slag removal operations. Pressure sensor 9 is used to detect the pressure value inside the main body 11. When the detected value is abnormal, controller 6 controls air valve 8 to close and checks whether vent valve 15 is in the correct position to prevent explosion accidents.

[0024] The safety device at the slag discharge port of the medium-speed coal mill in this embodiment also includes an alarm 10, which is communicatively connected to the controller 6. When the temperature sensor 5 of the safety device detects an excessively high or low temperature, or when the pressure sensor 9 detects an excessively high pressure, the alarm 10 will sound an alarm to alert the staff.

[0025] The purging device 2 in this embodiment includes a housing 21, a nozzle 22, and nozzle holes 23. The housing 21 is a flat, hollow structure with multiple nozzle holes 23. As shown in the figure, the nozzle holes 23 are evenly arranged on the housing 21. The nozzle 22 is installed inside each nozzle hole 23. The nozzle 22 is a conical nozzle. After nitrogen enters the purging device 2, it is sprayed into the housing body 11 through the nozzle 22. The conical nozzle ensures the uniformity of the spray.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A safety device for the slag tap of a medium speed coal mill, characterised in that: Including the residue discharge port box, the purging device, nitrogen tank, nitrogen valve, temperature sensor, controller, the purging device is fixed in the bottom of residue discharge port box, nitrogen tank is connected to the bottom of residue discharge port box through pipeline, is equipped with nitrogen valve on the pipeline of connecting nitrogen tank and residue discharge port box, temperature sensor is installed in the bottom of residue discharge port box, and is connected with controller communication.

2. The safety device for the slag tap of a medium speed coal mill according to claim 1, characterized in that: Still include compressed air tank, air valve, the compressed air tank is connected to the bottom of residue discharge port box through pipeline, is equipped with air valve on the pipeline of connecting compressed air tank and residue discharge port box.

3. The safety device for the slag tap of a medium speed coal mill according to claim 1, characterized in that: The residue discharge port box includes box body, upper plate valve, lower plate valve, flue valve, diffusion valve, the upper portion of box body is connected into mill flue and diffusion flue, is equipped with flue valve on the mill flue, is equipped with diffusion valve on the diffusion flue, the upper plate valve is connected in the upper portion of box body, the lower plate valve is connected in the lower portion of box body.

4. The safety device for the slag tap of a medium speed mill according to claim 2, characterized in that: Still include pressure sensor, the pressure sensor is arranged in the upper portion of residue discharge port box, and the pressure sensor is connected with controller communication.

5. The safety device for the slag tap of a medium speed coal mill according to claim 1, characterized in that: Still include alarm, and the alarm is connected with controller communication.

6. The safety device for the slag tap of a medium speed mill according to claim 1, characterized in that: The purging device includes shell, spray head, spray hole, the shell is flat plate structure, is opened multiple spray holes on the shell, installs spray head in the spray hole.

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