JPH06307205A - Leakage detector of airtight ring - Google Patents

Abstract

PURPOSE:To provide a leakage detector of airtigt rings, capable of early finding out the leakage of the airtight rings of joint parts for preventing the leakage of steam by interposing the airtight rings in the connecting parts of steam ports of a casing to steam pipes and specifying the airtight ring wherein the leakage is actually generated. CONSTITUTION:Temperature detectors 40 are respectively attached to individual leakage steam pipes 35, 38 through which leaked steam of airtight rings 14 to be interposed in joint parts 15 to 18 formed by connecting steam inlets 4, 5 and steam extracting ports 6, 7 to inlet steam pipes 10, 11 and steam extracting pipes 12, 13 flows. And the detected temperatures of the temperature detectors 40 are indicated and stored in a temperature measuring unit 41 so as to confirm the rising of the detected temperature caused by leaked steam, moreover the alarm is issued by an alarm 42 when the detected temperature is more than the fixed value, thereby the leakage of the airtight ring 14 is early found out and the airtight ring wherein the leakage is generated can be specified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for preventing steam from leaking to a joint portion connecting a steam port of a casing and a steam pipe, and particularly to a joint portion connecting a steam port of a casing of a steam turbine and a steam pipe. TECHNICAL FIELD The present invention relates to a leak detection device for an airtight ring that detects vapor leakage of an airtight ring that is installed in a vehicle.

[0002]

2. Description of the Related Art A steam turbine in a steam turbine power generation facility for driving a generator to generate power includes a high-pressure turbine, a low-pressure turbine, a condenser, and the like. In the high-pressure turbine, high-temperature and high-pressure steam from a boiler passes through a steam pipe. The water that flows into the casing and rotates the rotor that penetrates the casing to do work, and in order to improve the plant efficiency, it is generally bleed from the middle stage of the turbine, and is supplied to the boiler in the regeneration cycle by bleed through the bleed pipe. Is heating.
In this case, an airtight ring is placed in the joint where the steam pipe and the extraction pipe are connected to the casing to prevent steam from leaking to the outside from the joint, and the leaked steam in case of leakage is recovered. I am trying to lead to a water vessel.

FIG. 2 is a system diagram of a high-pressure turbine and a condenser of a steam turbine power generation facility including a high-pressure turbine having such an airtight ring. In FIG. 2, the high-pressure turbine 1 includes a rotor 2 and a casing 3 that surrounds the rotor 2, and the casing 3 is provided with steam inlets 4 and 5 and bleed ports 6 and 7 that bleed air from a middle stage. Reference numeral 8 denotes a condenser, which cools and condenses the exhaust steam discharged from a low-pressure turbine (not shown) connected to the high-pressure turbine 1 into a condensate, so that the pressure in the condenser 8 is equal to or lower than atmospheric pressure. Hold at a predetermined pressure. A generator (not shown) is connected to the low pressure turbine.

The steam inlets 4 and 5 of the high-pressure turbine 1 are inlet steam pipes 10 and 11 through which high-temperature and high-pressure steam from the boiler flows.
However, the extraction ports 6 and 7 of the high-pressure turbine 1 are connected with extraction pipes 12 and 13 for heating the feed water supplied to the boiler as a regeneration cycle. The connection points between the steam inlets 4, 5 and the inlet steam pipes 10, 11 and the extraction ports 6, 7
Joint portions 15, 16, 17, and 18 in which an airtight ring 14 is interposed are provided at the respective connection points between the air extraction pipes 12 and 13.

The joint portions 15 to 18 have the same structure as that of the joint portion 15 of the steam inlet 4 and the inlet steam pipe 10 shown in FIG. 3 as an example. In FIG. 3, a flange 4a at the end of the steam inlet 4 connecting the steam inlet 4 of the casing 3 and the inlet steam pipe 10 is provided with an annular packing groove 22 surrounding the steam flow passage 21 at this end surface. It should be noted that the packing groove 22 is provided with an annular groove 23 through which steam flows into the bottom surface on the steam flow channel 21 side and an annular groove 24 through which leaked steam flows into the bottom surface on the anti-steam flow channel 21 side.

The airtight ring 14 is made of a metal U which is resistant to high temperature and high pressure in which the outer surfaces on both sides of the head 14a form sealing surfaces.
Shaped packing, facing the groove 23 of the packing groove 22,
The packing groove 22 is fitted so as to cover the groove 24. On the other hand, on the end surface of the inlet steam pipe 10 connected to the flange portion 4a of the steam inlet 4, annular grooves 25 and 26 are provided at positions corresponding to the grooves 23 and 24 of the flange portion 4a. In addition,
When connecting the inlet steam pipe 10 and the flange portion 4a of the steam inlet 4, the sealing surfaces on both sides of the head portion 14a of the U-shaped airtight ring 14 are respectively the end surface of the inlet steam pipe 10 and the packing groove 2
Contact the bottom surface of 2.

Further, at the connecting portion between the inlet steam pipe 10 and the flange portion 4a of the steam inlet 4, the steam passage 21 and the grooves 23, 25 are provided.
An annular gap 30 communicating with and is provided. A passage hole 33 is provided which penetrates the pipe wall of the inlet steam pipe 10 and communicates with the groove 26 to guide the leaked steam of the airtight ring to the outside. Here, a screw 31 is provided around the end portion 10a of the inlet steam pipe 10, and the end portion 10a of the inlet steam pipe 10 and the flange portion 4a of the steam inlet 4 are firmly tightened by the ring nut 32 via the screw 31. .

The joint portions 15 to 1 thus formed
As shown in FIG. 2, individual leak steam pipes 35, 36, 37, 38 are provided in the passage holes 33 of the pipe 8, and a merge leak steam pipe 39 is provided to join these and connect to the condenser 8. There is. With such a configuration, the high-temperature and high-pressure steam flowing through the steam flow path 21 is fed from the gap 30 between the end portion 10a of the inlet steam pipe 10 and the flange portion 4a of the steam inlet 4 into the grooves 23, 25.
And enters the inside of the U-shaped airtight ring 14, expands the airtight ring 14 by steam pressure, and hermetically seals the sealing surface of the head 14a of the airtight ring 14, respectively, and seals the end surface of the inlet steam pipe 10 and the flange 4a. It is brought into contact with the bottom surface of the groove 22 to prevent steam from leaking to the outside.

The joint parts 16, 17 and 18 provided at the connection points of the inlet steam pipe 11 and the steam inlet 5 and the extraction pipes 12 and 13 and the extraction ports 6 and 7 are formed by the same airtight ring 14 as described above. Prevents leakage of steam to the outside. By the way, when the sealing performance is deteriorated due to deterioration of the airtight ring 14 due to long-term use and the steam leaks from the airtight ring 14, the joint portion 15 having the airtight ring 14 is formed.
Or 18, for example, when a leak occurs in the joint portion 15, the leaked steam flows from the individual leaked steam pipe 35 through the combined leaked steam pipe 39 and is collected in the condenser 8.

[0010]

As described above, the joint portion 1
When the airtight ring 14 of 5 to 18 leaks, it is difficult to detect this leak, and it is often discovered for the first time in periodical overhauls and the like. Therefore, if leakage is overlooked and the airtight ring 14 is used as it is for a long time, the sealing surface for airtightness is subject to erosion due to steam, and there is a problem that the cost and time required for the repair are great.

Further, when the amount of steam leaking from the airtight ring 14 increases, the internal pressure of the individual leaking steam pipe rises, and the joint portion having the airtight ring 14 leaks, for example, the inlet steam pipe 10
And a steam inlet 4 at a joint portion 15 for connecting the inlet steam pipe 10 and the steam inlet 4 with a ring nut 32.
Steam leaks to the outside from part 1. In this case, since the pressure in the combined leak steam pipe 39 also rises, this pressure is applied to the other joint parts 16, 17 and 18, and the steam is transmitted from the joint part to the outside from the screw 31 part which is joined as described above. there will be leaked, there is a disadvantage that leak in an air-tight ring of any joint for this can not be identified or has occurred.

If the leaked airtight ring cannot be identified as described above, it is necessary to overhaul all the joints having the airtight ring, and substitutes for all kinds of airtight rings that fit each joint are prepared. There is an inconvenience that it is necessary. An object of the present invention is to detect a steam leak from an airtight ring of a joint portion that connects a steam port of a casing and a steam pipe at an early stage, and when there are a plurality of joint portions, an airtight ring that can identify the leaked airtight ring. The invention is to provide a leak detection device.

[0013]

In order to solve the above-mentioned problems, according to the present invention, there are provided one or a plurality of steam inlets and outlets through which steam is introduced or discharged and steams connected to the respective steam inlets. The connecting portion between the steam port and the steam pipe is tightened by interposing an airtight ring that is fitted into an annular packing groove provided on the end face between the flowing steam pipe and prevents leakage of steam to the outside, In addition, in the case of vapor leakage of the airtight ring, joint parts having passage holes for guiding the leaked steam to the outside from the packing groove and individual leakage steam pipes connected to the passage holes of each joint part and through which the steam leaked from the airtight ring flows Detects vapor leaks in the airtight ring by combining the leaked vapor pipes that lead to the recovery unit by merging the leaked steam or the leaked vapor pipes that are connected to the passage holes and lead the steam leaked from the airtight ring to the recovery unit. Leak detection of airtight ring In the equipment, each individual leak steam pipe or each leak steam pipe is provided with a temperature detector that detects the temperature of the leak steam from the airtight ring, and the signal of the temperature detected by this detector is input to check the leak steam temperature. It shall be equipped with a temperature measuring device that gives instructions and records, or this measuring device and an alarm device that outputs an alarm when the temperature of the leaked steam exceeds a predetermined value.

[0014]

[Operation] Between the steam inlet and outlet for the steam provided in the casing and the steam pipe connected to this steam opening, an airtight ring is fitted in an annular packing groove provided on the end face. A joint portion is formed that tightens the connecting portion between the steam pipe and the steam pipe to prevent steam from leaking to the outside. When steam leaks due to deterioration of the airtight ring at this joint, the leaked steam flows through the individual leaking steam pipes through the passage holes communicating with the packing groove, and then merges with the individual leaking steam pipes. , Or through the leak steam pipe connected to the passage hole, and is recovered by the recovery unit.

In this case, the temperature of leak steam flowing through the individual leak steam pipe or the leak steam pipe is detected by an individual leak steam pipe connected to each joint or a temperature detector provided in the leak steam pipe, and this detection is performed. By instructing and recording the temperature to the temperature measuring device, and by issuing an alarm by the alarm device when the detected temperature is above the specified value, it is possible to detect the steam leakage of the airtight ring at an early stage and to detect the leaked airtight ring. Can be specified.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram of a high-pressure turbine and a condenser of a steam turbine power generation facility equipped with a leak detection device for an airtight ring according to an embodiment of the present invention. In FIG. 1, the same parts as those in FIGS. 2 and 3 are designated by the same reference numerals, and the description thereof will be omitted. 1 is different from the conventional example of FIG. 2 in that a temperature detector 40 is attached to each of the individual leak steam pipes 35 to 38, and a passage hole for leak steam from the airtight ring 14 of the joint portion 15 to 18 is attached by the temperature detector 40. 33 (see FIG. 3), the temperature of the leaked steam is detected, and a signal of this detected temperature is input to indicate and record the temperature of the leaked steam; That is, an alarm device 42 for outputting an alarm is provided. The alarm device 42 may not be provided depending on the case.

With such a configuration, if steam leakage occurs in any of the airtight rings 14 of the joint portions 15 to 18, for example, if steam leakage occurs in the airtight ring 14 of the joint portion 15, the joint portion 15 is connected. The temperature of the leaked steam flowing through the individual leaked steam pipe 35 is detected by the temperature detector 40. This detected temperature is instructed and recorded by the temperature measuring device 41, the detected temperature rises due to the temperature of the leaked steam, and the alarm 42
As a result, an alarm is output when the detected temperature of the leaked steam exceeds a predetermined value, so that the leak of the airtight ring 14 can be detected early.

When a large amount of leaked steam leaks from the joint portion, for example, the airtight ring 14 of the joint portion 15, the internal pressure of the merged leak steam pipe 39 rises and the individual leaked steam pipes 35 join together as described above. The leaked steam pipe 39 causes the leaked steam to flow also to the other individual leaked steam pipes 36, 37, 38, so that the temperature detected by the leaked steam detected by the temperature detector 40 provided therein increases. However, the individual leaking steam pipes 3 that have leaked due to the heat dissipation of the individual leaking steam pipes 3
Since the temperature detected by the temperature detector 40 of 5 becomes the maximum value,
The airtight ring where the leakage actually occurs can be easily identified.

It should be noted that, in the above-mentioned embodiment, although the combined leak steam pipe obtained by joining the individual leak steam pipes connected to each joint is connected to the condenser, it is provided by directly connecting each joint to the condenser. A temperature detector may be provided in the leaked steam pipe, and in this case, similarly to the above, the leak of the airtight ring can be detected early and the leaked airtight ring can be easily identified.

[0020]

As is apparent from the above description, according to the present invention, the temperature of the leaked steam due to the leakage of the airtight ring of the joint is detected by the temperature detector and the leaked steam is detected by the temperature measuring device. Check the temperature rise due to
Since the alarm is output by the alarm device when the temperature detected by the leaked steam is equal to or higher than the predetermined value, the leak of the airtight ring can be detected at an early stage and the airtight ring that has actually leaked can be specified. As a result, secondary damage such as damage to the sealing surface is not received, so that countermeasures can be taken easily.

[Brief description of drawings]

FIG. 1 is a system diagram of a high-pressure turbine and a condenser of a steam turbine section of a steam turbine power generation facility equipped with a leak detection device for an airtight ring according to an embodiment of the present invention.

FIG. 2 is a system diagram of a high-pressure turbine and a condenser in a steam turbine section of a conventional steam turbine power generation facility.

FIG. 3 is a cross-sectional view of a joint portion that connects a steam port of a casing and a steam pipe in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-pressure turbine 3 Casing 4 Steam inlet 5 Steam inlet 6 Extraction port 7 Extraction port 8 Condenser 10 Inlet steam pipe 11 Inlet steam pipe 12 Extraction pipe 13 Extraction pipe 14 Airtight ring 15 Joint part 16 Joint part 17 Joint part 18 Joint part 33 Passage Hole 35 Individual Leak Steam Pipe 36 Individual Leak Steam Pipe 37 Individual Leak Steam Pipe 38 Individual Leak Steam Pipe 39 Combined Leak Steam Pipe 40 Temperature Detector 41 Temperature Measuring Instrument 42 Alarm

Claims (1)

[Claims] 1. An annular packing groove provided on an end face between a steam port or ports through which steam flows in or out and a steam pipe connected to each steam port and through which steam flows. A passage that guides leaked steam from the packing groove to the outside when the connection between the steam port and the steam pipe is tightened through an airtight ring that prevents leakage to the outside. An individual leak steam pipe connected to a joint part having a hole and a passage hole of each joint part, and leak steam from the airtight ring flows through, and a combined leak steam pipe for guiding the leak steam to the recovery part, or each of the above Connect to the passage hole,
In a leak detection device for an airtight ring, which includes a leaked steam pipe that guides leaked steam from the airtight ring to a recovery unit, and which is provided for each individual leaked steam pipe or each leaked steam pipe, , A temperature detector that detects the temperature of the steam leaking from the airtight ring, and a temperature measuring device that inputs and receives the signal of the temperature detected by this detector, or indicates and records the temperature of the leaking steam, or this measuring device and the steam leak. A leak detection device for an airtight ring, comprising: an alarm device that outputs an alarm when the temperature is equal to or higher than a predetermined value.