GE exhaust gas thermocouple

Abstract

The utility model relates to thermocouple technical field, concretely is a GE exhaust thermocouple, including compensating conductor, the outside of one end of compensating conductor is bushed and is connected with wire protection metal hose and transition joint, one end of wire protection metal hose is fixedly connected with one end of transition joint, the other end of transition joint is fixedly connected with one end of thermocouple armor, the outside of thermocouple armor near transition joint one end is bushed and is connected with protection spring, the side of one end of protection spring is fixedly connected with the inside of heat dissipation joint one end, this GE exhaust thermocouple, promotes thermocouple armor diameter to 3mm, has enhanced the mechanical strength of armoring itself obviously, can better resist the external force influence that high temperature flue gas scouring and temperature fluctuation bring, while additionally adds the conduction transition joint and protection spring, eliminates the stress concentration core hidden danger from structure, greatly reduces the fracture probability of thermocouple.

Description

Technical Field

[0001] This utility model relates to the field of thermocouple technology, specifically a GE exhaust thermocouple. Background Technology

[0002] GE gas turbines are a series of core gas-fired power generation equipment developed by GE Electricova, a division of General Electric. They hold a significant position in the global energy generation field due to their high efficiency, reliability, and low-carbon adaptability. Exhaust temperature is a key indicator reflecting the thermodynamic cycle efficiency of a gas turbine. Under normal operating conditions, exhaust temperature is stably correlated with parameters such as unit load, compressor pressure ratio, and fuel combustion efficiency: as unit output increases, exhaust temperature rises according to a predetermined pattern; if the exhaust temperature does not match the load (e.g., the temperature rises sharply without an increase in load), it indicates that the compressor inlet filter is clogged, combustion in the combustion chamber is incomplete, or fouling occurs in the turbine flow path, leading to a decrease in unit cycle efficiency and an increase in coal (or gas) consumption for power generation. By monitoring exhaust temperature, parameters such as fuel supply and inlet guide vane opening can be adjusted in real time to maintain the unit within its optimal efficiency range. Thermocouples are used when monitoring gas turbine exhaust temperature.

[0003] Thermoelectric equipment typically operates in environments characterized by high-temperature flue gas erosion and frequent temperature fluctuations, such as... Figure 1 The existing exhaust thermocouple has an armor diameter of 2.5 mm. Figure 2 The first and second connection positions (pointed to by 1 and 2) are located at the junction of the armor and the protective bushing. Due to insufficient strength and stress concentration caused by temperature changes and flue gas scouring, fracture failures are likely to occur, which seriously affect the stability and continuity of temperature monitoring and increase equipment maintenance costs and downtime. Utility Model Content

[0004] In view of the problems existing in the prior art, this utility model discloses a GE exhaust thermocouple. The technical solution adopted includes a compensating wire, a protective metal hose and a transition joint are sleeved on the outer side of one end of the compensating wire, one end of the protective metal hose is fixedly connected to one end of the transition joint, the other end of the transition joint is fixedly connected to one end of the thermocouple armor, a protective spring is sleeved on the outer side of the thermocouple armor near the transition joint, the side of one end of the protective spring is fixedly connected to the inner side of one end of the heat dissipation joint, the inner side of the other end of the heat dissipation joint is welded to the side of the reinforcing bushing, the inner side of the reinforcing bushing is welded to the side of the thermocouple armor, the end face of the heat dissipation joint away from the spring is welded to the end face of one end of the protective bushing, the end face of the other end of the protective bushing is welded to the end face of one end of the wear-resistant head, the protective bushing is sleeved on the outside of the reinforcing bushing, and the inner side of the wear-resistant head is welded to the side of the reinforcing bushing.

[0005] As a preferred embodiment of this utility model, the outer diameter of the thermocouple armor is 3mm.

[0006] As a preferred embodiment of this utility model, the reinforcing bushing is made of high-temperature resistant stainless steel.

[0007] As a preferred embodiment of this invention, the wear-resistant head is made of alumina ceramic.

[0008] The beneficial effects of this utility model are as follows: By increasing the diameter of the thermocouple armor to 3mm, this utility model significantly enhances the mechanical strength of the armor itself, which can better resist the external force caused by high-temperature flue gas erosion and temperature fluctuations; at the same time, the addition of a conductive transition joint and a protective spring eliminates the core hidden danger of stress concentration from a structural perspective, greatly reduces the probability of thermocouple breakage, extends the service life of the equipment, reduces the frequency and cost of later maintenance, and ensures the stable operation of exhaust temperature monitoring. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the thermocouple structure of this utility model; Figure 2 This is a schematic diagram of an existing thermocouple structure.

[0010] In the diagram: 1. Compensating wire, 2. Protective metal flexible tube, 3. Transition joint, 4. Protective spring, 5. Heat dissipation joint, 6. Protective sleeve, 7. Wear-resistant head, 8. Reinforced bushing, 9. Thermocouple armor. Detailed Implementation

[0011] Example 1 like Figure 1 As shown, this utility model discloses a GE exhaust thermocouple. The technical solution includes a compensating wire 1, with a protective metal flexible tube 2 and a transition joint 3 sleeved on the outer side of one end of the compensating wire 1. One end of the protective metal flexible tube 2 is fixedly connected to one end of the transition joint 3, and the other end of the transition joint 3 is fixedly connected to one end of the thermocouple armor 9. A protective spring 4 is sleeved on the outer side of the thermocouple armor 9 near the end of the transition joint 3. The side of one end of the protective spring 4 is fixedly connected to the inner side of one end of the heat dissipation joint 5, and the other end of the heat dissipation joint 5... The inner side of the heat dissipation connector 5 is welded to the side of the reinforcing bushing 8, and the inner side of the reinforcing bushing 8 is welded to the side of the thermocouple armor 9. The outer diameter of the thermocouple armor 9 is 3mm. The end face of the heat dissipation connector 5 away from the spring 4 is welded to the end face of one end of the protective sleeve 6. The end face of the other end of the protective sleeve 6 is welded to the end face of one end of the wear-resistant head 7. The wear-resistant head 7 is made of alumina ceramic. The protective sleeve 6 is sleeved on the outside of the reinforcing bushing 8. The reinforcing bushing 8 is made of high-temperature resistant stainless steel. The inner side of the wear-resistant head 7 is welded to the side of the reinforcing bushing 8.

[0012] The working principle of this utility model is as follows: Two thermocouple electrodes of different materials are encapsulated inside the thermocouple armor 9. One end (measuring end) is inserted into the gas turbine exhaust passage along with the reinforcing bushing 8 and the alumina ceramic wear-resistant head 7, contacting the high-temperature exhaust gas. The other end (reference end) is connected to an external temperature measuring instrument via a compensating wire 1. When a temperature difference is formed between the measuring end and the reference end, a corresponding thermoelectric potential is generated. The compensating wire 1 can offset the influence of the environment on the reference end, allowing the external instrument to accurately calculate the real-time exhaust temperature based on the thermoelectric potential value and the calibration table. Simultaneously, the thermocouple, through a specific structure, ensures stable operation under harsh conditions. The thermocouple armor has a 3mm outer diameter. 9 enhances mechanical strength, resisting the impact of high-temperature flue gas erosion and temperature fluctuations. The protective spring 4 near the transition joint 3 can buffer the alternating stress caused by temperature fluctuations and flue gas erosion through elastic deformation, avoiding stress concentration at the joint. The high-temperature resistant stainless steel reinforced bushing 8 provides stable support for the thermocouple armor 9 and can withstand high temperatures. The protective sleeve 6 further strengthens the overall protection. The heat dissipation joint 5 realizes the connection and fixation of components and the heat conduction and dispersion. The synergistic effect of each component not only completes the accurate monitoring of exhaust temperature but also greatly reduces the risk of thermocouple breakage, ensuring the continuity and stability of temperature measurement work.

[0013] Components not described in detail in this article are existing technologies.

[0014] While the specific embodiments of this utility model have been described in detail above, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model. Modifications or variations that do not involve creative labor are still within the protection scope of this utility model.

Claims

1. A GE exhaust thermocouple, comprising a compensating wire (1), wherein a protective metal flexible tube (2) and a transition joint (3) are sleeved on the outer side of one end of the compensating wire (1), one end of the protective metal flexible tube (2) is fixedly connected to one end of the transition joint (3), and the other end of the transition joint (3) is fixedly connected to one end of the thermocouple armor (9), characterized in that, A protective spring (4) is fitted on the outer side of the thermocouple armor (9) near the transition joint (3). The side of one end of the protective spring (4) is fixedly connected to the inner side of one end of the heat dissipation joint (5). The inner side of the other end of the heat dissipation joint (5) is welded to the side of the reinforcing bushing (8). The inner side of the reinforcing bushing (8) is welded to the side of the thermocouple armor (9). The end face of the heat dissipation joint (5) away from the spring (4) is welded to the end face of one end of the protective sleeve (6). The end face of the other end of the protective sleeve (6) is welded to the end face of one end of the wear-resistant head (7). The protective sleeve (6) is fitted on the outside of the reinforcing bushing (8). The inner side of the wear-resistant head (7) is welded to the side of the reinforcing bushing (8).

2. The GE exhaust thermocouple according to claim 1, characterized in that: The outer diameter of the thermocouple armor (9) is 3 mm.

3. The GE exhaust thermocouple according to claim 1, characterized in that: The reinforcing bushing (8) is made of high-temperature resistant stainless steel.

4. A GE exhaust thermocouple according to claim 1, characterized in that: The wear-resistant head (7) is made of alumina ceramic.

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