Pulverized coal temperature protection device of coal mill

Abstract

The utility model discloses a coal mill pulverized coal temperature protection device which comprises a temperature protection pipe, a coal mill body is installed at the end of the temperature protection pipe, the temperature protection pipe comprises an air pipe, a cooling channel is arranged in the middle of the interior of the air pipe, ventilation channels are formed in the two sides of the cooling channel, and a flow channel is formed in the inner wall of the air pipe. A liquid inlet is formed in the right side of the bottom of the flow channel, a liquid inlet end is fixedly inserted into the liquid inlet, and meanwhile the end of the liquid inlet end is fixedly connected with a liquid inlet pipe. According to the pulverized coal temperature protection device of the coal mill, when the temperature of hot air in the temperature protection pipe is higher than 280 DEG C, cooling liquid enters the flow channel from the liquid inlet pipe and the liquid inlet end at the moment and is discharged from the liquid outlet end and the liquid outlet pipe, the hot air is cooled, and the temperature of the hot air is reduced to 280 DEG C or below; the stability of the hot air during drying of the pulverized coal is guaranteed, and the situation of explosion caused by spontaneous combustion of the pulverized coal due to too high temperature is avoided.

Description

Technical Field

[0001] The utility model relates to the field of coal mills, in particular to a coal powder temperature protection device for a coal mill. Background Art

[0002] A coal mill is a piece of equipment designed specifically to grind coal into a fine powder;

[0003] Its main functions are:

[0004] Improve combustion efficiency: Grind coal into fine powder to increase its surface area, which is conducive to full contact with air during combustion and improves combustion efficiency;

[0005] Meet process requirements: provide coal powder that meets the requirements for downstream processes;

[0006] Improve fuel properties: make coal easier to transport and store;

[0007] The working principle of the coal mill is to squeeze and grind the coal into coal powder through the relative movement of the grinding roller and the grinding disc. Specifically, when the coal mill is working, the raw coal enters the mill through the feeding device, and is continuously crushed and ground under the rotation of the grinding disc and the pressure of the grinding roller. At the same time, hot air enters from the mill inlet, exchanges heat with the coal powder, dries the coal powder, and carries it out of the mill.

[0008] The existing coal mill is not equipped with a temperature protection structure, so the hot air entering the mill cannot be controlled, which can easily cause the coal powder to spontaneously combust due to excessive temperature and cause explosion;

[0009] In order to prevent the spontaneous combustion of coal powder due to excessively high temperature, we provide a coal powder temperature protection device for a coal mill to solve the above technical problems. Utility Model Content

[0010] The utility model aims to provide a coal mill coal powder temperature protection device to solve the defects mentioned in the above background technology.

[0011] To achieve the above-mentioned purpose, a coal mill coal powder temperature protection device is provided, including a temperature protection tube, a coal mill body is installed at the end of the temperature protection tube, the temperature protection tube includes an air duct, and a cooling channel is arranged in the middle of the air duct, and ventilation channels are opened on both sides of the cooling channel, and a flow channel is opened on the inner wall of the air duct, a liquid inlet is opened on the right side of the bottom of the flow channel, and the liquid inlet end is fixedly plugged in the inside of the liquid inlet, and the end of the liquid inlet end is fixedly connected to the liquid inlet pipe, a discharge port is opened on the left side of the top of the flow channel, and the liquid outlet end is fixedly installed inside the discharge port, and the end of the liquid outlet end is fixedly connected to the liquid outlet pipe, the temperature protection tube is supported and fixed by a support frame, and the bottom of the support columns on both sides of the bottom of the support frame are screwed and fixed with universal wheels.

[0012] Preferably, the end of the air duct is connected to the external hot air duct, and the cross-section of the ventilation channel at both ends of the air duct is an isosceles trapezoidal structure.

[0013] Preferably, the height of the cooling channel is smaller than the height of the ventilation channel, and the length of the cooling channel is larger than the length of the flow channel.

[0014] Preferably, the axial cross-section of the flow channel and the air duct is a concentric circle structure, and multiple groups of upper heat exchange tubes and lower heat exchange tubes are evenly arranged inside the flow channel, a temperature transmitter is installed on the right side inside the air duct, and the temperature measuring probe of the temperature transmitter is arranged inside the air duct.

[0015] Preferably, the upper heat exchange tubes and the lower heat exchange tubes are arranged opposite to each other, and six groups of upper heat exchange tubes and lower heat exchange tubes are evenly arranged inside the cooling channel, while the distance between two adjacent groups of upper heat exchange tubes is consistent, and the distance between two adjacent groups of lower heat exchange tubes is consistent.

[0016] Preferably, the upper heat exchange tube and the lower heat exchange tube are both made of metal and have a "C"-shaped structure, and the coolant inside the upper heat exchange tube and the lower heat exchange tube cools the hot air flowing inside the cooling channel.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] When the internal temperature of the hot air in the temperature protection tube is higher than 280℃, the coolant enters the flow channel from the liquid inlet pipe and the liquid inlet end, and is discharged from the liquid outlet end and the liquid outlet pipe to cool the hot air down to below 280℃, thus ensuring the stability of the hot air when drying the pulverized coal and preventing the pulverized coal from spontaneously igniting due to excessive temperature and causing explosion.

[0019] The upper heat exchange tube and the lower heat exchange tube are both made of metal and are of a "C"-shaped structure; the upper heat exchange tube and the lower heat exchange tube are evenly arranged in multiple groups, which can increase the heat exchange area for the hot air and improve the cooling effect of the hot air. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view schematic diagram of the structure of the utility model;

[0021] Figure 2 The utility model structure Figure 1 Side view of

[0022] Figure 3 This is a schematic diagram of the structure of the temperature protection tube of the utility model;

[0023] Figure 4 The utility model structure Figure 3 Side view of.

[0024] Numbers in the figure: 1. Coal mill body; 2. Temperature protection tube; 21. Air duct; 22. Ventilation channel; 23. Cooling channel; 24. Flow channel; 25. Upper heat exchange tube; 26. Lower heat exchange tube; 3. Temperature transmitter; 4. Universal wheel; 5. Liquid outlet; 6. Liquid outlet pipe; 7. Liquid inlet end; 8. Liquid inlet pipe; 9. Support frame. DETAILED DESCRIPTION

[0025] See also Figure 1-4 The utility model provides a coal mill coal powder temperature protection device, including a temperature protection tube 2, a coal mill body 1 is installed at the end of the temperature protection tube 2, the temperature protection tube 2 includes an air duct 21, and a cooling channel 23 is arranged in the middle of the air duct 21, and ventilation channels 22 are arranged on both sides of the cooling channel 23, and a flow channel 24 is arranged on the inner wall of the air duct 21, and a liquid inlet is arranged on the right side of the bottom of the flow channel 24, and a liquid inlet end 7 is plugged and fixed inside the liquid inlet, and the end of the liquid inlet end 7 is fixedly connected to the liquid inlet pipe 8, a liquid discharge port is arranged on the left side of the top of the flow channel 24, and a liquid outlet end 5 is fixedly installed inside the liquid discharge port, and the end of the liquid outlet end 5 is fixedly connected to the liquid outlet pipe 6, the temperature protection tube 2 is supported and fixed by a support frame 9, and the bottom of the support columns on both sides of the bottom of the support frame 9 are screwed and fixed to a universal wheel 4.

[0026] Working principle: The hot air enters the temperature protection tube 2, the temperature of which can be detected by the temperature transmitter 3, and enters the coal mill body 1 to perform heat exchange on the coal powder inside the coal mill body 1 and dry the coal powder;

[0027] When the internal temperature of the hot air in the temperature protection tube 2 is higher than 280°C, the coolant enters the flow channel 24 from the liquid inlet pipe 8 and the liquid inlet end 7, and is discharged from the liquid outlet end 5 and the liquid outlet pipe 6 to cool the hot air so that its temperature drops below 280°C, thereby ensuring the stability of the hot air when drying the coal powder and preventing the coal powder from spontaneously igniting due to excessive temperature and causing an explosion.

[0028] As a preferred embodiment, the end of the air duct 21 is connected to the external hot air duct, and the cross-section of the ventilation channel 22 at both ends of the air duct 21 is an isosceles trapezoidal structure.

[0029] The height of the cooling channel 23 is smaller than the height of the ventilation channel 22 , and the length of the cooling channel 23 is greater than the length of the flow channel 24 .

[0030] like Figure 1-4 As shown: the height of the cooling channel 23 is smaller than the height of the ventilation channel 22. When the hot air inside the cooling channel 23 is circulated, cooling water flows inside the flow channel 24, the upper heat exchange tube 25, and the lower heat exchange tube 26 to cool the hot air and prevent the excessively high temperature airflow from entering the coal mill body 1.

[0031] As a preferred embodiment, the axial cross-section of the flow channel 24 and the air duct 21 is a concentric circle structure, and multiple groups of upper heat exchange tubes 25 and lower heat exchange tubes 26 are evenly arranged inside the flow channel 24, a temperature transmitter 3 is installed on the right side inside the air duct 21, and the temperature measuring probe of the temperature transmitter 3 is arranged inside the air duct 21.

[0032] The temperature probe of the temperature transmitter 3 is arranged inside the air duct 21; the temperature transmitter 3 can detect the hot air inside the air duct 21, and can prevent the airflow above 280°C from entering the coal mill body 1 for a long time.

[0033] As a preferred embodiment, the upper heat exchange tubes 25 and the lower heat exchange tubes 26 are arranged opposite to each other, and six groups of the upper heat exchange tubes 25 and the lower heat exchange tubes 26 are evenly arranged inside the cooling channel 23, and the distance between two adjacent groups of upper heat exchange tubes 25 is consistent, and the distance between two adjacent groups of lower heat exchange tubes 26 is consistent.

[0034] The upper heat exchange tube 25 and the lower heat exchange tube 26 are both made of metal and have a "C"-shaped structure, and the coolant inside the upper heat exchange tube 25 and the lower heat exchange tube 26 cools the hot air flowing inside the cooling channel 23.

[0035] The upper heat exchange tube 25 and the lower heat exchange tube 26 are both made of metal and are of a "C"-shaped structure; the upper heat exchange tube 25 and the lower heat exchange tube 26 are evenly arranged in multiple groups, which can increase the heat exchange area for the hot air and improve the cooling effect on the hot air.

Claims

1. A coal mill coal powder temperature protection device, comprising a temperature protection tube (2), characterized in that: The coal mill body (1) is installed at the end of the temperature protection tube (2). The temperature protection tube (2) comprises an air duct (21), and a cooling channel (23) is arranged in the middle of the air duct (21). Ventilation channels (22) are arranged on both sides of the cooling channel (23). A flow channel (24) is arranged on the inner wall of the air duct (21). A liquid inlet is arranged on the right side of the bottom of the flow channel (24), and a liquid inlet end (7) is inserted and fixed inside the liquid inlet. At the same time, the end of the liquid inlet end (7) is fixedly connected to the liquid inlet pipe (8). A liquid discharge port is arranged on the left side of the top of the flow channel (24), and a liquid outlet end (5) is fixedly installed inside the liquid discharge port. At the same time, the end of the liquid outlet end (5) is fixedly connected to the liquid outlet pipe (6). The temperature protection tube (2) is supported and fixed by a support frame (9), and the bottom of the support columns on both sides of the bottom of the support frame (9) are screwed and fixed to the universal wheels (4).

2. A coal mill coal powder temperature protection device according to claim 1, characterized in that: The end of the air duct (21) is connected to an external hot air duct, and the cross-section of the ventilation channel (22) at both ends of the air duct (21) is an isosceles trapezoidal structure.

3. A coal mill coal powder temperature protection device according to claim 1, characterized in that: The height of the cooling channel (23) is smaller than the height of the ventilation channel (22), and the length of the cooling channel (23) is greater than the length of the flow channel (24).

4. A coal mill coal powder temperature protection device according to claim 1, characterized in that: The axial cross-sections of the flow channel (24) and the air duct (21) are concentric circle structures, and a plurality of groups of upper heat exchange tubes (25) and lower heat exchange tubes (26) are evenly arranged inside the flow channel (24). A temperature transmitter (3) is installed on the right side inside the air duct (21), and a temperature measuring probe of the temperature transmitter (3) is arranged inside the air duct (21).

5. A coal mill coal powder temperature protection device according to claim 4, characterized in that: The upper heat exchange tubes (25) and the lower heat exchange tubes (26) are arranged opposite to each other, and six groups of the upper heat exchange tubes (25) and the lower heat exchange tubes (26) are evenly arranged inside the cooling channel (23), and the distance between two adjacent groups of upper heat exchange tubes (25) is consistent, and the distance between two adjacent groups of lower heat exchange tubes (26) is consistent.

6. A coal mill coal powder temperature protection device according to claim 4, characterized in that: The upper heat exchange tube (25) and the lower heat exchange tube (26) are both made of metal and have a "C"-shaped structure, and the coolant inside the upper heat exchange tube (25) and the lower heat exchange tube (26) cools the hot air flowing inside the cooling channel (23).

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