Install structure of thermo couple wire for temperature measuring of steam turbine steam path HP 1st stage

Abstract

The present invention relates to a thermocouple installation structure for measuring the first stage HP (high pressure) temperature of a steam turbine steam path, wherein the thermocouple is installed by inserting into a vertical hole on the HP blade carrier side that is drilled vertically and changed perpendicularly to the HP blade carrier in the steam turbine and then welding it vertically, a vertical hole on the HP dummy ring side that is drilled vertically on a straight line of the HP dummy ring located on the outer edge of the vertical line from the thermowell, and a vertical hole on the HIP outer casing side that is drilled vertically on a straight line of the HIP outer casing located on the outer edge of the vertical line from the HP dummy ring side, are formed in a straight line to form a thermocouple installation hole section, and by forming the thermocouple installation hole section and the thermocouple installation section in a straight line so that the installation and separation of the thermocouple formed in a round bar shape are easily performed, thereby improving the installation structure of the thermocouple for measuring the first stage HP (high pressure) temperature of the steam turbine steam path required for power plant operation control, the effect is to facilitate the recycling, new replacement, and installation of the thermocouple during maintenance inspection of the steam turbine.

Description

Technology Field

[0001] The present invention relates to a thermocouple installation structure for measuring the temperature of the first stage of the HP (high pressure) steam path of a steam turbine. Specifically, by improving the installation structure of a thermocouple for measuring the temperature of the first stage of the HP (high pressure) steam path of a steam turbine required for power plant operation control, the invention enables easy recycling, replacement, and installation of the thermocouple during maintenance inspection of the steam turbine. Background Technology

[0002] Generally, the "thermocouple installation structure for measuring the temperature of the first stage of the steam path HP of a steam turbine" is already widely disclosed and therefore a detailed description is omitted; however, reference may be made to Registered Utility Model No. 20-0448299 "Gas turbine downstream temperature measuring device" and Registered Utility Model No. 20-0309999 "Gas turbine temperature sensing device."

[0003] Meanwhile, the above "gas turbine downstream temperature measuring device" is a gas turbine downstream temperature measuring device in which a plurality of thermocouples inserted internally for temperature measurement are each detachably connected, thereby allowing each thermocouple that malfunctions to be replaced. It comprises a frame in which an incision is formed, a plate connected to close the incision, a fixing member having a plurality of through holes, a thermocouple mounted on a mounting bracket, and a structure that allows only the thermocouple that malfunctions to be replaced with a new one.

[0004] Furthermore, the “temperature sensing device for a gas turbine” is configured to prevent the removal of the hot gas shut-off part provided on the sensor rod and to prevent damage to the sensor rod by the fastening means, thereby improving the safety of the temperature sensing device itself and preventing power generation shutdown accidents caused by problems with the temperature sensing device.

[0005] The “temperature sensing device for a gas turbine” is configured such that a hot gas blocking part is formed by welding a temperature sensing means including a temperature sensor and a sensor rod in which an element wire is installed, a bushing formed integrally to protect the sensor rod from a fastening means, and a sleeve in which a lead wire is molded, wherein the fastening means is movably inserted onto the bushing of the sensor rod so as to prevent the hot gas blocking part provided on the sensor rod from being removed and to prevent damage to the sensor rod by the fastening means.

[0006] Meanwhile, the thermocouple installation structure (2) installed to measure the first stage HP temperature of the steam path of the steam turbine (4) shown in FIG. 1 is installed in a state exposed to one side of the components of the steam turbine (4) to measure the first stage HP temperature of the steam path of the steam turbine.

[0007] The above steam turbine (4) is formed by combining a High-Intermediate Turbine (HIP) rotor (Rotor: 5) formed in the center, an HP Blade Carrier (Blade Carrier: 6) on the outer side, an HP Dummy Ring (Dummy Ring: 16) on the outer side, and a HIP Outer Casing (Outer Casing: 20) on the outer side.

[0008] And the wire-type thermocouple (3) installed to measure the HP first stage temperature of the steam path of the steam turbine (4) measures the HP first stage temperature of the steam path (7) passing through the HP blade carrier (6) in the power plant operation control room (Control Room) outside the turbine and transmits the temperature measurement value.

[0009] This wire-type thermocouple (3) consists of a temperature sensing sensor (10), a thermocouple wire (Thermo Couple Wire: 9), a terminal head (Terminal Head: 38), a junction box (Junction Box: 34), and a compression fitting (Compression Fitting: 14).

[0010] Additionally, one end of the thermocouple wire (9) is connected to a temperature sensing sensor (10) installed in the thermowell (12) of the steam turbine (4), and the other end, which is extended to a certain length, is connected to a terminal head (38).

[0011] Meanwhile, the above thermowell (12) is configured to have a temperature sensing sensor (10) built in to detect the temperature of the first stage of the steam turbine (4) steam path. This thermowell (12) is installed tightly by welding into an inclined hole (8) formed by drilling an inclined cross-sectional structure into the HP blade carrier (6).

[0012] Additionally, the temperature sensing sensor (10) is secured with a compression fitting (14) so ​​that it can be firmly installed inside the thermo well (12). When the temperature sensing sensor (10) is installed, the thermocouple wire (9) connected thereto is bent several times and secured with clips (18) on the outer side of the HP blade carrier (6) facing the HP dummy ring (16).

[0013] Subsequently, the thermocouple wire (9) inserted through a single vertical hole (22) formed in the HIP outer casing (20) is secured to the HIP outer casing (20) with a compression fitting (14). Then, a terminal head (38) is connected to the thermocouple wire (9) exposed in the HIP outer casing (20).

[0014] In addition, a junction box (34) that functions as an intermediate connection terminal is connected by a cable (36) to the terminal head (38) exposed on the HIP outer casing (20) so that the temperature measurement of the first stage of the HP can be transmitted to the power plant operation control room outside the steam turbine through the steam path of the steam turbine (4).

[0015] However, the thermocouple wire (9) installed to measure the temperature of the first stage of the steam path HP of a conventional steam turbine is installed exposed on the outer surface of the HP blade carrier (6) while being bent several times without considering maintenance, so there are problems such as poor temperature measurement and measurement transmission errors in the first stage of the HP of the steam turbine (4) after long-term use.

[0016] In addition, when performing a regular overhaul of the steam turbine (4), the wire-type thermocouple (3) is disassembled and serviced, and at this time, the thermocouple wire (9) is cut and removed.

[0017] Accordingly, there are problems such as increased maintenance costs because the thermocouple wire (9) must be replaced with a new one every time, and increased fatigue of the worker because the thermocouple wire (9) is long, causing delays in maintenance time.

[0018] Therefore, there is a need to change the thermocouple wire layout to prevent loss of the thermocouple wire (9) and enable reusable placement and quick replacement during regular disassembly and maintenance inspection of the steam turbine (4). Prior art literature

[0019] [Patent Document 0001] Registered Utility Model No. 20-0448299 "Gas Turbine Downstream Temperature Measuring Device" (Published Mar. 30, 2010) [Patent Document 0002] Registered Utility Model No. 20-0309999 "Temperature Sensing Device for Gas Turbine" (Published April 8, 2003) The problem to be solved

[0020] The present invention was developed to solve the above-mentioned problems, and its purpose is to make it easier to install a round-bar type thermocouple for measuring the HP 1st stage temperature of the steam turbine steam flow path required for power plant operation control.

[0021] Another objective of the present invention is to enable the independent replacement and installation of a round-bar type thermocouple without disassembling the steam turbine HIP rotor, HP blade ring, and HP dummy ring by changing the installation of the thermocouple.

[0022] Another objective of the present invention is to measure the temperature of the HP 1st stage in the steam turbine steam path and accurately transmit it to the power plant operation control room.

[0023] Another objective of the present invention is to enable reliable maintenance inspection by continuously and accurately measuring the HP 1st stage temperature of the steam turbine steam path.

[0024] Another objective of the present invention is to enable a worker to easily replace a round bar type thermocouple on-site without disassembling components in a stopped steam turbine when a defect or error occurs during the temperature measurement of the HP 1st stage of the steam turbine steam path.

[0025] Another objective of the present invention is to prevent interference with the disassembly and assembly of the HIP rotor, HP blade carrier, and HP dummy rings when the rod-type thermocouple is simply disconnected during maintenance inspection of the steam turbine.

[0026] Another objective of the present invention is to facilitate the replacement and installation of thermocouples by installing a thermowell vertically and tightly by welding it to the HP blade carrier stage.

[0027] Another objective of the present invention is to facilitate the installation, replacement, and recycling of a round-rod type thermocouple by forming a vertical hole on the HP dummy ring side and a vertical hole on the HP blade carrier side in a straight line in the steam turbine.

[0028] Another objective of the present invention is to enable a rod-type thermocouple exposed in a vertical hole on the HIP outer casing side of the HIP outer casing to be securely fixed through the fastening of a compression fitting. means of solving the problem

[0029] The present invention, for achieving the above-mentioned technical problem, is characterized by a thermocouple installation structure installed for measuring the first stage temperature of a steam turbine steam path HP, wherein the thermocouple installation hole section is formed by inserting a thermowell into a vertical hole on the HP blade carrier side that is drilled vertically in the HP blade carrier in the steam turbine and then welding it vertically, a vertical hole on the HP dummy ring side that is drilled vertically in a straight line on the HP dummy ring located on the outer edge of the vertical line from the thermowell, and a vertical hole on the HIP outer casing side that is drilled vertically in a straight line on the HIP outer casing located on the outer edge of the vertical line from the HP dummy ring side, and the thermocouple installation hole section is formed by placing the position change installation of the thermowell and the thermocouple installation hole section in a straight line, thereby making it easy to install and separate a thermocouple formed in the shape of a round bar.

[0030] The above-described rod-type thermocouple is characterized by comprising a terminal head formed such that a cable is connected to one end and is installed to be exposed outside the HIP outer casing, a rod portion having one end inserted and installed in a thermocouple installation hole drilled to be formed in a straight line on a component of a medium-duty turbine, and a screw coupling portion formed at the other end of the rod portion to be coupled to a vertical hole on the HIP outer casing side of the HIP outer casing.

[0031] The rod portion of the above-described rod-type thermocouple is characterized by being installed in a coupled manner such that the tip remains inserted into the thermowell while being inserted through the vertical hole on the HP dummy ring side and the vertical hole on the HIP outer casing side.

[0032] The round rod type thermocouple assembled and installed in the vertical hole on the HP dummy ring side and the vertical hole on the HIP outer casing side is characterized by enabling easy new and recycled installation and replacement work when separating and joining the screw coupling part, which has a terminal head formed thereon, in the vertical hole on the HIP outer casing side. Effects of the invention

[0033] According to the thermocouple installation structure for measuring the temperature of the first stage of the steam turbine steam path HP of the present invention, there is an effect of making it easy to install a thermocouple for measuring the temperature of the first stage HP of the steam turbine steam path required for power plant operation control.

[0034] In addition, by changing the installation of the thermocouple, it has the effect of enabling the independent replacement and installation of the thermocouple without disassembling the steam turbine HIP rotor, HP blade ring, and HP dummy ring.

[0035] In addition, it has the effect of measuring the temperature of the HP 1st stage through the steam turbine steam flow path so that it can be accurately transmitted to the power plant operation control room.

[0036] In addition, it has the effect of enabling reliable maintenance inspection by continuously and accurately measuring the HP 1st stage temperature in the steam turbine steam flow path.

[0037] In addition, it has the effect of allowing the thermocouple to be easily replaced by itself without disassembling parts of the stopped steam turbine in the event of a malfunction or error during the temperature measurement of the HP 1st stage of the steam turbine steam flow path.

[0038] In addition, simply disconnecting the thermocouple during maintenance inspection of the steam turbine has the effect of preventing interference with the disassembly and assembly of the HIP rotor, HP blade carrier, and HP dummy rings.

[0039] In addition, by welding a thermo well vertically to the HP blade carrier stage, it has the effect of making it easy to replace and install the thermocouple.

[0040] In addition, by forming a thermocouple installation hole section in the steam turbine by drilling a vertical hole on the HP dummy ring side and a vertical hole on the HP blade carrier side so that they are aligned in a straight line, the installation, replacement, and recycling of the round-rod type thermocouple can be easily performed. Brief explanation of the drawing

[0041] FIG. 1 is a schematic image showing a thermocouple installation structure installed to measure the temperature of the first stage of the steam path HP of a steam turbine according to the prior art. FIG. 2 is a schematic image showing a thermocouple installation structure installed to measure the first stage temperature of a steam turbine steam path HP according to the present invention. Specific details for implementing the invention

[0042] To fully understand the present invention, preferred embodiments of the invention will be described with reference to the accompanying drawings. Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be interpreted as being limited to the embodiments described in detail below. These embodiments are provided to more completely explain the present invention to those with average knowledge in the art. Accordingly, the shapes of elements in the drawings may be exaggerated to emphasize clearer explanations. It should be noted that in each drawing, identical components may be depicted with the same reference numerals. Furthermore, detailed descriptions of known functions and configurations that are deemed to unnecessarily obscure the essence of the present invention are omitted.

[0043] Hereinafter, a thermocouple installation structure for measuring the first stage temperature of a steam turbine steam path HP according to the present invention will be described in detail by explaining a preferred embodiment of the present invention with reference to the attached drawings.

[0044] The thermocouple installation structure (2) for measuring the first stage temperature of a steam turbine steam path HP according to the present invention comprises, as shown in FIG. 2, a thermowell (12) that is installed by being inserted into and vertically welded into a vertical hole (12a) on the HP blade carrier side that is drilled vertically from the HP blade carrier (6) in the steam turbine (4), a vertical hole (32a) on the HP dummy ring side that is drilled vertically in a straight line from the outer edge of the vertical line from the thermowell (12), a vertical hole (32b) on the HIP outer casing side that is drilled vertically in a straight line from the HP dummy ring side vertical hole (32a) that is drilled vertically from the outer edge of the vertical line from the HP dummy ring side vertical hole (32a), and a thermocouple installation hole portion (32) formed by forming the thermowell (12) in a changing position and the thermocouple installation hole portion (32) in a straight line, thereby enabling the installation of a thermocouple (30) formed in a round bar shape and Make separation easy.

[0045] Additionally, the above-mentioned rod-type thermocouple (30) is formed such that, as shown in FIG. 2, a terminal head (38) is installed so as to be exposed outside the HIP outer casing (20) with a cable (36) connected to one end, and the rod part (30a) has one end inserted into a thermocouple installation hole (32) that is formed in a straight line on a component of the medium turbine (4), and a screw coupling part (30b) is formed to be coupled to the vertical hole (54) on the HIP outer casing side of the HIP outer casing (20) at the other end of the rod part (30a).

[0046] In addition, the rod portion (30a) of the rod-type thermocouple (30) is installed so that, as shown in FIG. 2, the tip is inserted through the HP dummy ring side vertical hole (32a) and the HIP outer casing side vertical hole (32b), and the tip is maintained in a state where it is inserted into the thermowell (12).

[0047] In addition, the round rod type thermocouple (30) assembled and installed in the HP dummy ring side vertical hole (32a) and the HIP outer casing side vertical hole (32b) as shown in FIG. 2 allows for easy new and recycled installation and replacement work when separating and joining the screw coupling part (30b) with the terminal head (38) formed in the HIP outer casing side vertical hole (32b).

[0048] In addition, the above-mentioned round-bar type thermocouple (30) is used by connecting a junction box (34) that functions as an intermediate connection terminal to a terminal head (3) installed in an open type on the HIP outer casing (20) as shown in FIG. 2, so that the temperature measurement of the steam turbine HP 1st stage can be transmitted to the power plant operation control room using a cable (36).

[0049] Additionally, the above-mentioned rod-type thermocouple (30) is inserted and installed in a thermocouple installation hole (32) composed of a vertical hole (32a) on the HP dummy ring side and a vertical hole (32b) on the HIP outer casing side, which are formed to be aligned in a straight line from the HIP outer casing (20) to the HP dummy ring (16) and the HP blade carrier (6), as shown in FIG. 2.

[0050] In addition, the thermocouple hole (32) allows the round rod thermocouple (30) to be easily disassembled and operated without interference during maintenance inspection of the HIP rotor (5), HP blade carrier (6), and HP dummy ring (16) constituting the steam turbine (4), as shown in FIG. 2.

[0051] In addition, in the round bar type thermocouple (30), the round bar portion (30a) can be formed with a different outer diameter at regular intervals, making it easy to separate or install from the thermocouple installation hole portion (32) of the steam turbine (4).

[0052] Hereinafter, the thermocouple installation structure for measuring the first stage temperature of the steam turbine steam path HP according to the invention, which is carried out as described above, will be explained in detail through the drawings.

[0053] First, the round bar portion (30a) of the round bar type thermocouple (30) is inserted into the thermowell (12) of the HP blade carrier (6) through the thermocouple installation hole portion (32), which consists of the HP dummy ring vertical hole (32a) and the HIP outer casing side vertical hole (32b), to prepare for fixed installation.

[0054] Then, when the screw connection part (30b) is connected to the vertical hole (32b) on the HIP outer casing side, the round rod type thermocouple (30) is fixedly installed so that the terminal head (38) is exposed.

[0055] Afterwards, when the rod-type thermocouple (30) is firmly installed by being coupled to the vertical hole (54) on the HIP outer casing side, the cable (36) formed on the terminal head (38) is connected to the junction box (34), and the rod-type thermocouple (30) is completed.

[0056] And the round-bar type thermocouple (30) installed up to the thermowell (12) measures the temperature of the first stage of the steam turbine HP and transmits the temperature measurement to the power plant operation control room through a junction box (34) that functions as an intermediate terminal connected to the terminal head (38) by a cable (36).

[0057] However, in the event that errors and defects occur when transmitting the temperature measurement of the first stage of the steam turbine HP due to long-term use of the round bar type thermocouple (30), the disadvantage that on-site measures were impossible with the conventional wire type thermocouple is overcome by installing the round bar type thermocouple (30) and applying the straight-line type thermocouple installation hole (32), which allows for immediate on-site measures.

[0058] In addition, the conventional wire-type thermocouple has the advantage of making replacement and installation easier by installing a round bar-type thermocouple (30) and applying a straight-line thermocouple installation hole (32), which overcomes the disadvantages of increased maintenance costs and increased worker fatigue caused by the need to cut and discard or replace the wire-type thermocouple every time during maintenance inspection of the steam turbine (4).

[0059] The embodiments of the thermocouple installation structure for measuring the temperature of the first stage HP of a steam turbine steam path according to the present invention described above are merely illustrative, and those skilled in the art will readily understand that various modifications and equivalent alternative embodiments are possible therefrom. Therefore, it will be readily understood that the present invention is not limited only to the forms mentioned in the above detailed description. Accordingly, the true technical scope of protection of the present invention should be determined by the technical spirit of the appended claims. Furthermore, the present invention should be understood to include all modifications, equivalents, and substitutions within the spirit and scope of the present invention as defined by the appended claims. Explanation of the symbols

[0060] 2: Installation structure of round bar type thermocouple 4: Steam turbine 5: HIP Rotor 6: HP Blade Carrier 7: Steam Euro 8: Sloping hole 9: Thermocouple Wire 10: Temperature sensing sensor 12: Thermo Well 12a: HP Blade Carrier Side Vertical Hole 14: Compression Fittings 16: HP Dummy Ring 18: Clip 20: HIP Outer Casing 22: Vertical Centerless Hole 30: Round bar type thermocouple 30a: Round bar 30b: Screw connection 32: Thermocouple installation hole 32a: HP dummy ring-side vertical hole 32b: Vertical hole on the outer casing side of the HIP 34: Junction Box 36: Cable 38: Terminal Head

Claims

Claim 1 In a thermocouple installation structure (2) installed to measure the first stage temperature of the steam path HP of a steam turbine (4), the thermocouple installation hole section (32) is formed by a thermocouple installed by inserting into a vertical hole (12a) on the HP blade carrier side that is drilled vertically from the HP blade carrier (6) in the steam turbine (4) and then welding it vertically, a vertical hole (32a) on the HP dummy ring side that is drilled vertically in a straight line from the outer edge of the vertical line from the thermocouple (12), a vertical hole (32b) on the HIP outer casing side that is drilled vertically in a straight line from the HP dummy ring side vertical hole (32a) that is drilled vertically from the outer edge of the vertical line from the HP dummy ring side vertical hole (32a), and a vertical hole (32b) on the HIP outer casing side that is drilled vertically in a straight line from the outer edge of the vertical line from the HP dummy ring side vertical hole (32a). By forming the thermocouple installation hole section (32) and the thermocouple installation hole section (32) in a straight line, the installation and separation of the thermocouple (30), which is formed in a round bar shape, can be easily achieved. A thermocouple installation structure for measuring the temperature of the first stage of the steam path HP of a steam turbine, characterized by being configured to be formed. Claim 2 A thermocouple installation structure for measuring the first stage temperature of a steam turbine steam path HP according to claim 1, wherein the rod-shaped thermocouple (30) is formed such that a terminal head (38) is installed so as to be exposed outside the HIP outer casing (20) with a cable (36) connected to one end, and a rod portion (30a) having one end inserted into a thermocouple installation hole (32) formed in a straight line on a component of a steam turbine (4), and a screw coupling portion (30b) formed to be coupled to a vertical hole (54) on the HIP outer casing side of the HIP outer casing (20) at the other end of the rod portion (30a). Claim 3 In claim 2, the thermocouple installation structure for measuring the first stage temperature of a steam turbine steam path HP is characterized in that the rod portion (30a) of the rod-type thermocouple (30) is installed so as to be inserted through the HP dummy ring side vertical hole (32a) and the HIP outer casing side vertical hole (32b), while maintaining the state in which the tip is inserted into the thermowell (12). Claim 4 A thermocouple installation structure for measuring the first stage temperature of a steam turbine steam path HP, wherein the rod-shaped thermocouple (30) assembled and installed in the vertical hole (32a) on the HP dummy ring side and the vertical hole (32b) on the HIP outer casing side is characterized in that the screw coupling part (30b) having a terminal head (38) formed therein allows for easy new and recycled installation and replacement work when separating and joining the vertical hole (32b) on the HIP outer casing side.

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