Coal mill pulverized coal temperature monitoring device

Abstract

The utility model discloses a pulverized coal temperature monitoring device for a coal mill, which comprises a temperature monitoring device body, one end of the temperature monitoring device body is fixedly connected with an air powder pipe, the other end of the temperature monitoring device body is fixedly connected with a powder inlet pipe, and the end part of the air powder pipe is connected with a coal mill body. The end part of the powder inlet pipe is connected with the boiler; the temperature monitoring device body comprises a temperature monitor. According to the pulverized coal temperature monitoring device for the coal mill, the heated plate transmits heat to the heat conduction cylinder, the heat conduction cylinder heats the temperature detection probe, then the temperature of pulverized coal is displayed on a display screen on the temperature monitor, heat transfer work is conducted on the temperature detection probe in a heat conduction mode, and the temperature of the pulverized coal is monitored. The temperature detection probe is prevented from being in direct contact with pulverized coal moving at a high speed, the temperature detection probe is prevented from being abraded, the temperature detection probe is protected, and the service life of the temperature monitor is prolonged.

Description

Technical Field

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

[0002] 300MV thermal power generating units are generally equipped with five coal mills. The coal powder ground by each coal mill is sent to the four corners of the boiler through four air-powder pipes to participate in the combustion of the boiler. The coal powder sent into the furnace must be dry and have a certain temperature to help combustion, but the temperature should not be too high, otherwise it will cause coal powder to explode, so the temperature of the air-powder mixture at the coal mill outlet must be correctly measured;

[0003] At present, the temperature of the air-powder mixture at the outlet of the coal mill in power plants is measured by directly inserting a wear-resistant thermal resistor into the outlet pipe to measure the temperature by contacting the air-powder mixture.

[0004] This kind of measurement can truly reflect the temperature, but it still has some shortcomings. Due to long-term erosion, a wear-resistant thermal resistor can only be used for one month at most. In order to ensure the safety of the air-powder pipeline at the outlet of the coal mill, components need to be replaced frequently, which increases the workload. Frequent replacement of components also increases the cost of inspection and maintenance, and increases the operating cost. Utility Model Content

[0005] The purpose of the utility model is to provide a coal mill coal powder temperature monitoring device to solve the defects mentioned in the above background technology.

[0006] To achieve the above object, a coal mill coal powder temperature monitoring device is provided, comprising a temperature monitoring device body, one end of the temperature monitoring device body is fixedly connected to an air powder pipe, and the other end of the temperature monitoring device body is fixedly connected to a powder inlet pipe, while the end of the air powder pipe is connected to the coal mill body, and the end of the powder inlet pipe is connected to a boiler;

[0007] The temperature monitoring device body includes a temperature monitor, and the bottom of the temperature monitor is fixed to the temperature detection probe, and the outer side of the temperature detection probe is wrapped with a mounting cover, and the bottom of the mounting cover is fixedly connected to a fixing seat, and the fixing seat covers the surface of the detection tube and is fixed by bolts, and the outer side of the bottom of the temperature detection probe is wrapped with a heat-conducting tube, and the bottom of the heat-conducting tube is fixedly connected to the heated plate.

[0008] Preferably, the mounting cover is made of plastic material and has a "U"-shaped cross-section, and the axial cross-sections of the mounting cover, the temperature detection probe, and the heat-conducting tube are concentric circle structures.

[0009] Preferably, a positioning groove is provided inside the heat-conducting tube, and the positioning groove is adapted to the size of the temperature detection probe, and the bottom of the temperature detection probe is inserted into the positioning groove and fixed by a fixing bolt.

[0010] Preferably, a mounting hole is provided on the surface of the detection tube, and a sealing gasket is fixedly mounted on the outer side of the bottom of the heat-conducting tube, while the heat-conducting tube is inserted into the interior of the mounting hole and is sealed by the sealing gasket.

[0011] Preferably, the bottom of the heat-conducting tube is fixed to the heat-receiving plate by welding, and the heat-conducting tube is a cylindrical structure made of metal copper, and the heat-receiving plate is a rectangular structure made of metal copper.

[0012] Preferably, the heated plate is arranged inside the detection tube, and a plurality of groups of perforations are evenly provided on the surface of the heated plate, and the perforations are arranged in a circular shape, and the distances between two adjacent groups of perforations are consistent.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the heated heat receiving plate transfers heat to the heat conducting tube, the heat conducting tube heats the temperature detection probe, and the temperature of the coal powder is then displayed on the display screen of the temperature monitor. The temperature detection probe is heat-transferred by heat conduction, and direct contact between the temperature detection probe and the high-speed moving coal powder is avoided, and the temperature detection probe is avoided from being worn, the temperature detection probe is protected, and the service life of the temperature monitor is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the main structure of the structural temperature monitoring device of the utility model;

[0016] Figure 3 The utility model structure Figure 2 Side view of

[0017] Figure 4 This is a schematic diagram of the heat-conducting tube structure of the utility model and its installation structure.

[0018] Numbers in the figure: 1. Coal mill body; 2. Air powder pipe; 3. Powder inlet pipe; 4. Boiler; 5. Temperature monitoring device body; 51. Temperature monitor; 52. Mounting cover; 53. Fixed seat; 54. Detection tube; 55. Temperature detection probe; 56. Heat transfer tube; 57. Positioning groove; 58. Sealing gasket; 59. Heating plate; 60. Perforation; 61. Fixing bolt. DETAILED DESCRIPTION

[0019] See also Figure 1-4The utility model provides a coal mill coal powder temperature monitoring device, including a temperature monitoring device body 5, one end of the temperature monitoring device body 5 is fixedly connected to the air powder pipe 2, and the other end of the temperature monitoring device body 5 is fixedly connected to the powder inlet pipe 3, while the end of the air powder pipe 2 is connected to the coal mill body 1, and the end of the powder inlet pipe 3 is connected to the boiler 4;

[0020] The temperature monitoring device body 5 includes a temperature monitor 51, and the bottom of the temperature monitor 51 is fixed to the temperature detection probe 55, and the outer side of the temperature detection probe 55 is wrapped with a mounting cover 52, and the bottom of the mounting cover 52 is fixedly connected to a fixing seat 53, and the fixing seat 53 covers the surface of the detection tube 54 and is fixed by bolts, and the outer side of the bottom of the temperature detection probe 55 is wrapped with a heat-conducting tube 56, and the bottom of the heat-conducting tube 56 is fixedly connected to a heat receiving plate 59.

[0021] Working principle: The pulverized coal processed by the coal mill body 1 shuttles inside the air-powder pipe 2 and enters the boiler 4 after the metal temperature is detected by the temperature monitoring device body 5;

[0022] The working mode of the temperature monitoring device body 5 is as follows: the coal powder impacts the heated plate 59 and passes through the through hole 60. The coal powder can transfer heat to the heated plate 59. The heated heated plate 59 transfers heat to the heat-conducting tube 56. The heat-conducting tube 56 heats the temperature detection probe 55. Then the temperature of the coal powder is displayed on the display screen of the temperature monitor 51. The temperature detection probe 55 is heat-conducted by heat conduction to avoid direct contact between the temperature detection probe 55 and the high-speed moving coal powder, to avoid wear of the temperature detection probe 55, to protect the temperature detection probe 55, and to increase the service life of the temperature monitor 51.

[0023] As a preferred embodiment, the mounting cover 52 is made of plastic material and has a "U"-shaped cross-section, and the axial cross-sections of the mounting cover 52, the temperature detection probe 55, and the heat-conducting tube 56 are concentric circle structures.

[0024] A positioning groove 57 is provided inside the heat-conducting tube 56 , and the positioning groove 57 matches the size of the temperature detection probe 55 . Meanwhile, the bottom of the temperature detection probe 55 is inserted into the positioning groove 57 and fixed by a fixing bolt 61 .

[0025] like Figure 1-4 As shown: the bottom of the temperature detection probe 55 is inserted into the positioning groove 57 opened inside the heat-conducting tube 56. When the heat-receiving plate 59 is heated, the heat-conducting tube 56 is heated, and then the temperature detection probe 55 is heated by the heat-conducting tube 56. In an indirect way, the temperature detection probe 55 detects the temperature of the coal powder, and the flow of coal powder is prevented from causing wear to the temperature detection probe 55.

[0026] As a preferred embodiment, a mounting hole is opened on the surface of the detection tube 54 , and a sealing gasket 58 is fixedly mounted on the outer bottom of the thermal tube 56 . Meanwhile, the thermal tube 56 is inserted into the mounting hole and sealed by the sealing gasket 58 .

[0027] As a preferred embodiment, the bottom of the heat-conducting tube 56 is welded and fixed to the heat-receiving plate 59, and the heat-conducting tube 56 is a cylindrical structure made of metal copper, while the heat-receiving plate 59 is a rectangular structure made of metal copper.

[0028] The heat-conducting tube 56 and the heat-receiving plate 59 are both made of metal copper and have excellent thermal conductivity. The temperature of the coal powder can be quickly transferred to the temperature detection probe 55 through the heat-conducting tube 56 and the heat-receiving plate 59, and the temperature of the coal powder is indirectly detected through the temperature detection probe 55.

[0029] As a preferred embodiment, the heated plate 59 is disposed inside the detection tube 54, and a plurality of groups of perforations 60 are evenly formed on the surface of the heated plate 59. The perforations 60 are circularly arranged, and the distances between two adjacent groups of perforations 60 are consistent.

Claims

1. A coal mill coal powder temperature monitoring device, comprising a temperature monitoring device body (5), characterized in that: One end of the temperature monitoring device body (5) is fixedly connected to the air powder pipe (2), and the other end of the temperature monitoring device body (5) is fixedly connected to the powder inlet pipe (3), while the end of the air powder pipe (2) is connected to the coal mill body (1), and the end of the powder inlet pipe (3) is connected to the boiler (4); The temperature monitoring device body (5) comprises a temperature monitor (51), and the bottom of the temperature monitor (51) is fixed to a temperature detection probe (55), and the outer side of the temperature detection probe (55) is wrapped with a mounting cover (52), and the bottom of the mounting cover (52) is fixedly connected to a fixing seat (53), and the fixing seat (53) covers the surface of the detection tube (54) and is fixed by bolts, and the outer side of the bottom of the temperature detection probe (55) is wrapped with a heat-conducting tube (56), and the bottom of the heat-conducting tube (56) is fixedly connected to a heated plate (59).

2. A coal mill coal powder temperature monitoring device according to claim 1, characterized in that: The mounting cover (52) is made of plastic material and has a U-shaped cross-section. The axial cross-sections of the mounting cover (52), the temperature detection probe (55), and the heat-conducting tube (56) are concentric circle structures.

3. A coal mill coal powder temperature monitoring device according to claim 1, characterized in that: The heat-conducting tube (56) has a positioning groove (57) formed inside thereof, and the positioning groove (57) is adapted to the size of the temperature detection probe (55). The bottom of the temperature detection probe (55) is inserted into the positioning groove (57) and fixed by a fixing bolt (61).

4. A coal mill coal powder temperature monitoring device according to claim 1, characterized in that: A mounting hole is provided on the surface of the detection tube (54), and a sealing gasket (58) is fixedly mounted on the outer side of the bottom of the heat-conducting tube (56), while the heat-conducting tube (56) is inserted into the interior of the mounting hole and is sealed by the sealing gasket (58).

5. The coal mill coal powder temperature monitoring device according to claim 1, characterized in that: The bottom of the heat-conducting tube (56) is welded and fixed to the heat-receiving plate (59), and the heat-conducting tube (56) is a cylindrical structure made of metal copper, while the heat-receiving plate (59) is a rectangular structure made of metal copper.

6. A coal mill coal powder temperature monitoring device according to claim 5, characterized in that: The heated plate (59) is arranged inside the detection tube (54), and a plurality of groups of perforations (60) are evenly provided on the surface of the heated plate (59). The perforations (60) are arranged in a circular shape, and the distance between two adjacent groups of perforations (60) is consistent.

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