JPH0668356B2 - Steam pipe abnormality detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention separates drain generated in a steam pipe from steam, and measures the amount of the separated drain to detect abnormalities in the steam pipe.
Further, the present invention relates to a steam pipe abnormality detection device for detecting an abnormality in a boiler or a steam trap that discharges drain from a steam pipe.

The steam pipe that supplies the steam generated by the boiler to each steam-using device contains water droplets from the carry-over of boiler water and drain generated by natural heat dissipation. Normally, a steam trap is connected to the steam pipe to automatically discharge the drain. However, if the steam trap discharges poorly or the carryover amount increases, a large amount of drain is mixed in the steam pipe, causing damage to the equipment due to water hammer, and the train leading to equipment using steam. This sometimes caused a decrease in the production of steam-using equipment.

<Prior art> A steam trap is installed at regular intervals in the steam pipe to automatically discharge the drain, or a steam separator for separating steam and drain is placed at the inlet of the steam-using device to force the drain. It is common practice to eliminate it.

<Problems to be Solved by the Present Invention> The separation capability of the steam separator is naturally limited, and even if a drain exceeds the limit due to an abnormality in the steam pipe, the above-mentioned one detects the abnormal state. There was a problem that the drain could not continue to flow into the steam-using equipment.
Factors that cause a large amount of drain include the above-mentioned carryover and poor discharge of the steam trap, and poor heat retention of the steam pipe.

The technical problem of the present invention is to detect the amount of drainage separated in the steam pipe to detect abnormalities in the steam pipe, that is, defective carryover of the boiler and steam trap discharge defects, and poor heat retention of the steam pipe. Therefore, it is possible to prevent the drain that cannot be separated by the separator from continuing to flow into the steam-using device and the generation of a water hammer.

<Means for Solving the Problem> A steam / water separator for separating steam and drain is arranged in the steam pipe, and a steam outlet and a drain outlet for discharging the steam and drain after separation are provided in the steam / water separator. An area type flow meter consisting of a taper pipe and a float is connected to the outlet, and a float position detecting means is provided in the area type flow meter to detect the position of the float to measure the amount of fluid passing through the float section. A flow rate measuring unit is provided.

<Operation> By providing the flow rate measuring unit including the area type flow meter and the float position detecting means in communication with the drain outlet, the amount of drain separated by the steam separator can be measured. Therefore, it is possible to detect an abnormal state in which a large amount of drain is mixed in the steam pipe.

<Effects of the Invention> An abnormal condition of a steam pipe can be detected, and by correcting a carryover, a poor discharge of a steam trap, or a poor heat retention of the steam pipe, which is a cause of the abnormal condition, a drain is caused in a device using steam. It is possible to prevent inflow and prevent a decrease in productivity of the steam use device, and also to prevent a water hammer.

Further, the operating state of the boiler and the operating state of the steam trap can be monitored by a simple means of measuring the separated drain amount by the area type flow meter and the float position detecting means.

<Example> An example showing a specific example of the above technical means will be described.
(See FIG. 1) A steam separator 3 is attached to a steam pipe 3 for supplying steam generated in the boiler 1 to a steam using device 2. The steam separator 7 is provided with a steam outlet 7 and a drain outlet 8, the steam outlet 7 is in communication with the steam-using device 2, and the drain outlet 8 is in communication with the taper pipe lower end portion 6a of the area flow meter 5. A float 9 is arranged between the lower end portion 6a of the tapered pipe and the upper end portion 6b of the tapered pipe, which floats up and down according to the flow rate inside the tapered pipe. The upper end 6b of the tapered pipe is appropriately connected to a drainage port or the like. The taper tube is made of a transparent body, and an optical sensor including light emitting elements 10a, 10b, 10c and light receiving element elements 11a, 11b, 11c as position detecting means for detecting the position of the float 9 is provided on the outer circumference of the taper tube. . An arithmetic unit 50 that detects the position of the float 9 with an optical sensor and calculates the flow rate passing through the float 9 based on the detection result, and
A display unit 51 for displaying a calculation result and warning an abnormal condition is connected to an optical sensor. Power for the optical sensor, the arithmetic unit 50, and the display unit 51 is supplied by the thermoelectric generator 12 mounted on the outer circumference of the steam separator 4. That is, the steam separator 4 is filled with high-temperature steam and drain, and converts the thermal energy into electrical energy and supplies the electrical energy. reference number
Reference numeral 52 is a steam trap for discharging the drain generated in the steam using device 2, and 53 is a steam trap for discharging the drain generated in the steam pipe 3.

The steam separator 4 has an inlet 14, a steam outlet 7, and a drain outlet 8 formed in the main body 13 and communicates with the inlet 14 to form a cylindrical partition member.
An annular space (16) is formed between itself and the body (13) surrounding it. A cone-shaped screen 31 is arranged between the inlet 14 and the annular space 16, and the lower part of the annular space 16 communicates with the upper part of the drainage sump chamber 26 of the drainage valve 55. The upper part of the drainage chamber 26 is a partition member
It communicates with the steam outlet 7 through a central opening of 20. Annular space
A swirl vane 24 composed of an inclined wall is arranged at 16. Further, the lower portion of the partition member 20 is a flare-shaped draining portion 18 that is expanded to the outside.
To form.

A steam trap is formed as a drain valve 55 at the bottom of the drain chamber 26. A drain valve port 28 communicating with the drain outlet 8 is formed at the bottom of the drain pool 26, and a spherical valve float 30 facing each other is formed.
Are accommodated in a free state and covered with a float cover 32. An air vent 34 is opened in the upper portion of the float cover 32. Therefore entrance 14
When the mixed fluid of steam and drain that has flowed in from is passed through the annular space 16, it is swirled by the swirl vanes 24 to be swirled, and since water has a larger mass than steam, it is swung outward and along the inner wall of the surrounding body. And flows down into the drainage collection chamber 26, and the light steam flows out to the steam outlet 7 through the central opening of the partition member 20. The valve float 30 floats down along with the water level in the drainage sump chamber 26, opens and closes the drainage valve port 28, and automatically discharges the drainage accumulated in the drainage sump chamber 26 to the drain outlet 8.
Although the steam / water separator 4 in which the steam / water separator and the steam trap are integrated is shown, the steam trap is not always necessary, and the point is that only the drain separated from the steam / water is discharged from the drain outlet 8. It may be a needle valve or a globular valve.

Water droplets generated by carryover of the boiler 1 and drains generated by natural heat dissipation in the steam pipe 3 are separated by the steam separator 4.
Separated and reaches the area type flow meter 5. If carry-over increases or the steam trap 53 fails to discharge drain due to defective discharge, the amount of drain reaching the area type flow meter 5 also increases, and an abnormality in the steam pipe 3 can be detected.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a steam pipe abnormality detection device of the present invention. 1: Boiler, 2: Steam-using equipment 3: Steam pipe, 4: Steam-water separator 5: Area type flow meter, 6a: Lower end of tapered pipe 7: Steam outlet, 8: Drain outlet 9: Float 10a, 10b, 10c : Light emitting elements 11a, 11b, 11c: Light receiving element 12: Thermoelectric element, 14: Inlet 20: Partition member, 24: Swirling blade

Claims (1)

[Claims] 1. A steam-water separator for separating steam and drain is arranged in a steam pipe, the steam-water separator is provided with a steam outlet and a drain outlet, and the area formula is composed of a taper pipe and a float communicating with the drain outlet. An apparatus for detecting an abnormality in a steam pipe, which is provided with a flow meter, which is provided with float position detecting means in the area type flow meter to detect the position of the float to thereby measure the amount of fluid passing through the float.