A flue gas temperature measuring device for a power plant boiler

Abstract

The utility model relates to flue gas temperature measurement technical field, concretely is a kind of flue gas temperature measuring device for power station boiler, including protective suite, sealing box, multiple thermocouples, sleeve and multiple fixed mechanism, multiple anti-shaking mechanisms are equipped on protective suite, the head of protective suite is equipped with connecting piece, multiple perforations are set up in sleeve, sealing box is filled with castable, support tube is welded on the outer wall of water wall, protective suite is horizontally arranged in boiler hearth, sealing box is arranged on the water wall outside boiler, support tube penetrates sealing box. The utility model can be relatively fixed and anti-abrasion protection to thermocouple by the cooperation between thermocouple, protective suite, sleeve, sealing box and anti-shaking mechanism each other, to realize long time uninterrupted continuous measurement flue gas temperature, and also improve measurement accuracy, installation is also very convenient, maintenance is simple.

Description

Technical Field

[0001] This utility model relates to the field of flue gas temperature measurement technology, specifically a flue gas temperature measurement device for power plant boilers. Background Technology

[0002] Power plant boilers generate a large amount of flue gas during operation, which requires continuous and long-term temperature measurement. Traditional measurement devices include mechanical telescopic probe measuring devices and infrared flue gas temperature online monitoring devices.

[0003] The basic application scenario for mechanical telescopic probe measuring devices is during the start-up of power plant boilers, up to 50% BMCR of the boiler equipment, when the flue gas temperature does not exceed 600℃. If the temperature exceeds 600℃, the probe needs to be withdrawn, otherwise the device will easily burn out.

[0004] Infrared flue gas temperature monitoring devices calculate the temperature of flue gas by receiving its radiant energy and analyzing its energy spectrum. This device is suitable for high-temperature and high-pressure environments; however, flue gas pollutants can affect the measurement data, resulting in lower accuracy. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a flue gas temperature measuring device for power plant boilers to solve the problems mentioned in the background art.

[0006] The technical solution of this utility model is:

[0007] A flue gas temperature measuring device for a power plant boiler includes a protective kit, a sealing box, multiple thermocouples, a sleeve, and multiple fixing mechanisms. The protective kit is equipped with multiple anti-sway mechanisms, and the head end of the protective kit is provided with a connector. The sleeve has multiple through holes for the thermocouples to pass through. The sealing box is filled with castable refractory. A support tube is welded to the outer wall of the water-cooled wall. The protective kit is horizontally installed inside the boiler furnace. The sealing box is installed on the water-cooled wall outside the boiler. The support tube passes through the sealing box. The head end of the protective kit seals through the water-cooled wall and the support tube. The sleeve is connected to the head end of the support tube through the connector. The tail ends of the multiple thermocouples are disposed in the through holes. The multiple fixing mechanisms are disposed between the anti-sway mechanisms and the furnace tubes.

[0008] Preferably, the protective kit includes multiple protective sleeves and multiple connecting tubes, with adjacent protective sleeves being detachably connected via connecting tubes. The anti-sway mechanism is connected to the protective sleeves, and the foremost protective sleeve penetrates the support tube and is connected to the connector.

[0009] Preferably, the outer walls of both sides of the protective sleeve are provided with a first external thread, and the inner wall of the connecting pipe is provided with a first internal thread that mates with the first external thread. After assembly, the protective sleeve and the connecting pipe are welded together.

[0010] Preferably, the anti-sway mechanism includes a left steel plate and a right steel plate. The left steel plate includes an integrally formed first lower connecting part, a first central through part, and a first upper connecting part. The right steel plate includes an integrally formed second lower connecting part, a second central through part, and a second upper connecting part. The first lower connecting part and the second lower connecting part are each provided with through holes that match the connecting pipe. The first lower connecting part is connected to the second lower connecting part, and the first upper connecting part is connected to the second upper connecting part. A clamping groove for clamping the furnace inner tube is formed between the first central through part and the second central through part.

[0011] Preferably, the fixing mechanism includes a short arc plate and a long arc plate, the short arc plate and the long arc plate are respectively connected to the two side walls of the second central section, and the short arc plate and the long arc plate are both attached to the outer wall of the furnace inner tube.

[0012] Preferably, the connector includes an inner flange and an outer flange. The inner flange is welded to the head end of the support pipe, and the head end of the protective sleeve located at the front end is welded to the outer flange. The inner flange and the outer flange are fixedly connected by bolts.

[0013] Preferably, the inner wall of the perforation is provided with a second internal thread, and the tail end of the thermocouple is provided with a connector that is screwed into the second internal thread.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention enables the thermocouple to be relatively fixed and protected against wear through the cooperation of the thermocouple, protective kit, sleeve, sealing box and anti-sway mechanism, thereby realizing long-term uninterrupted continuous measurement of flue gas temperature, improving measurement accuracy, and is also very convenient to install and simple to maintain. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the flue gas temperature measuring device for power plant boilers according to this utility model. Figure 1 ;

[0017] Figure 2 This is a partial structural diagram of the flue gas temperature measuring device for power plant boilers according to the present invention. Figure 1 ;

[0018] Figure 3 This is a partial structural diagram of the flue gas temperature measuring device for power plant boilers according to the present invention. Figure 2 ;

[0019] Figure 4 This is a partial structural diagram of the flue gas temperature measuring device for power plant boilers according to the present invention. Figure 3 .

[0020] In the picture:

[0021] 1. Water-cooled wall; 11. Support tube; 2. Furnace inner tube; 3. Protective kit; 31. Protective sleeve; 311. Inner flange; 32. Connecting pipe; 4. Sealing box; 5. Sleeve; 51. Perforation; 52. Outer flange; 6. Anti-sway mechanism; 61. First lower connecting part; 62. First central through part; 63. First upper connecting part; 64. Second lower connecting part; 65. Second central through part; 66. Second upper connecting part; 67. Hoop groove; 7. Short arc plate; 8. Long arc plate. Detailed Implementation

[0022] 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.

[0023] Please see Figure 1-4 The present invention will describe the above technical solution in detail through the following embodiments:

[0024] A flue gas temperature measuring device for a power plant boiler includes a protective kit 3, a sealing box 4, multiple thermocouples, a sleeve 5, and multiple fixing mechanisms. The protective kit 3 is provided with multiple anti-sway mechanisms 6, and the head end of the protective kit 3 is provided with a connector. The sleeve 5 has multiple through holes 51 for the thermocouples to pass through. The sealing box 4 is filled with castable refractory. A support tube 11 is welded to the outer wall of the water-cooled wall 1. The protective kit 3 is horizontally installed inside the boiler furnace. The sealing box 4 is installed on the water-cooled wall 1 outside the boiler. The support tube 11 passes through the sealing box 4. The head end of the protective kit 3 seals through the water-cooled wall 1 and the sealing box 4. The sleeve 5 is connected to the head end of the support tube 11 through the connector. The tail ends of the multiple thermocouples are installed in the through holes 51. The multiple fixing mechanisms are installed between the anti-sway mechanisms 6 and the furnace tube 2.

[0025] This utility model, through the protective kit 3 and multiple anti-sway mechanisms 6, enables the thermocouple for temperature measurement to be placed inside the boiler furnace. The protective kit 3 protects the thermocouple, provides insulation, prevents thermocouple wear, and allows the thermocouple to continuously measure flue gas temperature for a long time.

[0026] The thermocouple used in this application can be either type N or type K, and the choice can be made based on the flue gas temperature of the measurement area.

[0027] The entire protective kit 3 extends within 10 meters from the side wall of the boiler and forms an angle of 88° to 92° with the side wall.

[0028] The sealed box 4 can prevent accidental leakage of smoke.

[0029] The protective kit 3 includes multiple protective sleeves 31 and multiple connecting pipes 32. Two adjacent protective sleeves 31 are detachably connected by connecting pipes 32. The anti-sway mechanism 6 is connected to the protective sleeves 31. The protective sleeve 31 at the foremost end passes through the support pipe 11 and is connected to the connector.

[0030] A complete protective tube body is formed by splicing multiple protective sleeves 31 and multiple connecting pipes 32, which improves the convenience of installation and disassembly.

[0031] The protective sleeve 31 and the connecting pipe 32 can be made of nickel-based material, which can be GH3039 or 310S material.

[0032] Since the temperature of the high-temperature flue gas inside the boiler can reach 1000℃, the inner diameter of the connecting pipe 32 can be slightly larger than the outer diameter of the protective sleeve 31, in the range of 2~4mm. This can provide some space for the expansion of the protective sleeve 31 and also play a role in preventing swaying.

[0033] The protective sleeve 31 has a first external thread on both outer walls, and the connecting pipe 32 has a first internal thread that mates with the first external thread on its inner wall. This method not only ensures the convenience of installation and disassembly, but also improves the connection stability between the protective sleeve 31 and the connecting pipe 32. In addition, the protective sleeve 31 and the connecting pipe 32 are welded after assembly.

[0034] The anti-sway mechanism 6 includes a left steel plate and a right steel plate. The left steel plate includes an integrally formed first lower connecting part 61, a first central through part 62 and a first upper connecting part 63. The right steel plate includes an integrally formed second lower connecting part 64, a second central through part 65 and a second upper connecting part 66. The first lower connecting part 61 and the second lower connecting part 64 are each provided with through holes that match the connecting pipe 32. The first lower connecting part 61 is connected to the second lower connecting part 64, and the first upper connecting part 63 is connected to the second upper connecting part 66. A clamping groove 67 for clamping the furnace inner tube 2 is formed between the first central through part 62 and the second central through part 65.

[0035] The through holes in the first lower connecting part 61 and the second lower connecting part 64 allow the left and right steel plates to apply a supporting force to the connecting pipe 32, which comes from the clamped furnace inner tube 2.

[0036] The fixing mechanism includes a short arc plate 7 and a long arc plate 8. The short arc plate 7 and the long arc plate 8 are respectively connected to the two side walls of the second central passage 65. The short arc plate 7 and the long arc plate 8 are both attached to the outer wall of the furnace tube 2, which increases the contact area with the furnace tube 2 and reduces the stress on the furnace tube 2.

[0037] The connector includes an inner flange 311 and an outer flange 52. The inner flange 311 is welded to the head end of the support pipe 11, and the head end of the protective sleeve 31 located at the front end is welded to the outer flange 52. The inner flange 311 and the outer flange 52 are fixedly connected by bolts.

[0038] The seal between the outer flange 52 and the inner flange 311 can be achieved by using a high-temperature resistant non-metallic material, such as graphite packing or aluminum silicate rope. The thermocouple can pass through the middle of the outer flange 52 and the inner flange 311.

[0039] Of course, an inner concave annular groove can also be opened on the contact surface of the inner flange 311 and the outer flange 52. The size of the inner concave annular groove is 6mm*8mm. Packing is filled into the inner concave annular groove to further ensure the sealing effect and prevent the boiler unit from vibrating and causing flue gas leakage.

[0040] The inner wall of the perforation 51 is provided with a second internal thread, and the tail end of the thermocouple is provided with a connector that is screwed into the second internal thread, which makes it easy to replace the thermocouple and convenient to maintain.

Claims

1. A flue gas temperature measuring device for a power plant boiler, characterized in that... The system includes a water-cooled wall (1), a protective kit (3), a sealing box (4), multiple thermocouples, a sleeve (5), and multiple fixing mechanisms. The protective kit (3) is provided with multiple anti-sway mechanisms (6). The head end of the protective kit (3) is provided with a connector. The sleeve (5) is provided with multiple through holes (51) for the thermocouples to pass through. The sealing box (4) is filled with casting material. The outer wall of the water-cooled wall (1) is welded with a support tube (11). The protective kit (3) is horizontally set inside the boiler furnace. The sealing box (4) is set on the water-cooled wall (1) outside the boiler. The support tube (11) passes through the sealing box (4). The head end of the protective kit (3) seals through the water-cooled wall (1) and the support tube (11). The sleeve (5) is connected to the head end of the support tube (11) through the connector. The tail ends of the multiple thermocouples are set in the through holes (51). The multiple fixing mechanisms are set between the anti-sway mechanisms (6) and the furnace tube (2).

2. The flue gas temperature measuring device for a power plant boiler according to claim 1, characterized in that... The protective kit (3) includes multiple protective sleeves (31) and multiple connecting pipes (32). Two adjacent protective sleeves (31) are detachably connected through the connecting pipes (32). The anti-sway mechanism (6) is connected to the protective sleeves (31). The protective sleeve (31) at the foremost end passes through the support pipe (11) and is connected to the connector.

3. The flue gas temperature measuring device for a power plant boiler according to claim 2, characterized in that... The protective sleeve (31) has a first external thread on both outer walls, and the connecting pipe (32) has a first internal thread that mates with the first external thread on its inner wall. After assembly, the protective sleeve (31) and the connecting pipe (32) are welded together.

4. The flue gas temperature measuring device for a power plant boiler according to claim 2, characterized in that... The anti-sway mechanism (6) includes a left steel plate and a right steel plate. The left steel plate includes an integrally formed first lower connecting part (61), a first central through part (62) and a first upper connecting part (63). The right steel plate includes an integrally formed second lower connecting part (64), a second central through part (65) and a second upper connecting part (66). The first lower connecting part (61) and the second lower connecting part (64) are each provided with through holes that match the connecting pipe (32). The first lower connecting part (61) is connected to the second lower connecting part (64), and the first upper connecting part (63) is connected to the second upper connecting part (66). A clamping groove (67) for clamping the furnace inner tube (2) is formed between the first central through part (62) and the second central through part (65).

5. The flue gas temperature measuring device for a power plant boiler according to claim 4, characterized in that... The fixing mechanism includes a short arc plate (7) and a long arc plate (8). The short arc plate (7) and the long arc plate (8) are respectively connected to the two side walls of the second central passage (65). The short arc plate (7) and the long arc plate (8) are both attached to the outer wall of the furnace inner tube (2).

6. The flue gas temperature measuring device for a power plant boiler according to claim 2, characterized in that... The connector includes an inner flange (311) and an outer flange (52). The inner flange (311) is welded to the head end of the support pipe (11), and the head end of the protective sleeve (31) at the foremost end is welded to the outer flange (52). The inner flange (311) and the outer flange (52) are fixedly connected by bolts.

7. The flue gas temperature measuring device for a power plant boiler according to claim 1, characterized in that... The inner wall of the perforation (51) is provided with a second internal thread, and the tail end of the thermocouple is provided with a connector that is screwed into the second internal thread.

Images