JPH0320197A - Malfunction detector for steam pipe - Google Patents

Abstract

PURPOSE:To prevent such a possibility that drain flows into a steam service apparatus and a water hammer is produced from occurring by detecting a pressure differential in front and in the rear of an orifice attached to a drain outlet of a steam separator, and installing a flow measuring part measuring a fluid quantity. CONSTITUTION:A steam separator 4 separating steam from drain and vice versa is set up in a steam pipe 3, and there are provided a steam outlet 7 and a drain outlet 8 exhausting steam and drain after separation in this steam separator 4. An orifice 9 is attached to this drain outlet 8 as interconnected. Then, pressure sensors 5a, 5b are installed in front and in the rear of this orifice, and a pressure differential between them whereby an operational part 50 operating the extent of flow passing through the orifice 9 and a display part 51 displaying the operational result and warning an abnormal state are installed there. Thus, being interconnected to the drain outlet 8 and a flow measuring part consisting of the orifice 9 and the pressure sensors 5a, 5b is installed there, through which a drain quantity separated by the steam separator 4 is made measurable, thus such an abnormal state that drain is mixed in the steam pipe 3 in large quantities can be detected.

Description

[Detailed description of the invention] Industrial application field> The present invention separates condensate generated in steam pipes from steam and measures the amount of separated condensate, thereby detecting abnormalities in steam pipes.
The present invention further relates to a steam pipe abnormality detection device that detects abnormalities in boilers, steam traps that discharge condensate from steam pipes, and the like.

The steam pipes that supply the steam generated in the boiler to each steam-using device are contaminated with water droplets due to carryover of boiler water and condensate generated due to natural heat radiation. Usually, a steam trap is connected to the steam pipe to automatically discharge the condensate. However, if the steam trap fails to discharge or the amount of carryover increases, a large amount of condensate will get mixed into the steam pipe, causing water hammer and damaging equipment, or the condensate will reach steam-using equipment. This sometimes caused a decrease in the productivity of steam-using equipment.

Conventional technology> Steam traps are installed at regular intervals in steam pipes to automatically discharge condensate, or steam and water separators are placed at the inlets of steam-using equipment to force condensate out. It is common practice to exclude

Problems to be Solved by the Present Invention The separation ability of a steam-water separator naturally has a limit, and even if drain exceeding the limit flows in due to an abnormality in the steam pipe, the above-mentioned device cannot detect the abnormal state. There was a problem in that the condensate continued to flow into the steam-using equipment.

Factors that cause a large amount of condensate to occur include the above-mentioned carryover and poor discharge of steam traps, as well as poor heat retention of steam pipes.

The technical problem of the present invention is to detect abnormalities in steam pipes, such as boiler carryover, steam trap discharge failure, and steam pipe heat retention failure, by measuring the amount of drain separated in steam pipes. This is to prevent condensate that cannot be separated by the separator from continuing to flow into steam-using equipment and from causing water hammer.

Means for Solving the Problems> A steam separator for separating steam and condensate is arranged in the steam pipe, and the steam separator is provided with a steam outlet and a drain outlet for discharging the separated steam and condensate, and An orifice is installed in communication with the outlet, and a flow rate measuring section is provided that measures the amount of fluid passing through the orifice by providing pressure detection means before and after the orifice to detect the differential pressure.

Effects> By providing a flow rate measurement section consisting of an orifice and pressure detection means in communication with the drain outlet, the amount of drain separated by the steam/water separator can be measured. Therefore, an abnormal state in which a large amount of condensate is mixed in the steam pipe can be detected.

Effects of the Invention> Abnormal conditions in steam pipes can be detected, and condensate can be prevented from flowing into steam-using equipment by correcting the causes of the abnormal conditions, such as carryover, poor steam trap discharge, and poor heat retention of steam pipes. By preventing steam from flowing in, it is possible to prevent a decrease in the productivity of steam-using equipment, and also to prevent water hammer.

In addition, the operational state of the boiler and the operational state of the steam trap can also be monitored by a simple method of measuring the amount of separated drain using an orifice and a pressure detection means.

Embodiment> An embodiment illustrating a specific example of the above technical means will be described. <
See Figure 1> A steam separator 4 is attached to a steam pipe 3 that supplies steam generated in the boiler 1 to the steam-using equipment 2. The steam separator 4 is provided with a steam outlet 7 and a drain outlet 8, the steam outlet 7 communicates with the steam using equipment 2, and the drain outlet 8 communicates with an orifice 9 via a pressure sensor 5a as a pressure detection means. do. A pressure sensor 5b is also attached to the outlet side of the orifice 9.

The pressure sensors 5a and 5b and the orifice 9 monitor the flow rate measuring section. The pressure sensors 5a and 5b detect whether there is a flow in the orifice 9, and the pressure before and after the orifice 9 is measured with the pressure sensors 5a and 5b, and the flow rate passing through the orifice 9 is calculated based on the measurement results. arithmetic unit 5
0, and a display unit 51 that displays calculation results and warns of abnormal conditions is connected to the pressure sensors 5a and 5b. Power for the pressure sensors 5a, 5b, the numbing section 50, and the display section 51 is supplied by a thermoelectric generating element 10 attached to the outer periphery of the steam/water separator 4. That is, the steam/water separator 4 is filled with high-temperature steam and drain, and converts the thermal energy into electrical energy and supplies it. Reference number @52 is a steam trap for discharging condensate generated in the steam-using equipment 2, and reference number 53 is a steam trap for discharging condensate generated in the steam pipe 3.

The steam/water separator 4 has an inlet 12, a steam outlet 7, and a train outlet 8 formed in a main body 11, a cylindrical partition member 20 is attached to communicate with the inlet 12, and an annular partition member 20 is connected to the main body 11 surrounding the main body 11. Shape the space 16. A cone-shaped screen 31 is arranged between the eight ports 12 and the annular space 16, and the lower part of the annular space 16 communicates with the upper part of the drain chamber 26 of the drain valve 6. The upper part of the drainage sump chamber 26 communicates with the steam outlet 7 through the central opening of the partition member 20. In the annular space 16, a swirling vane 24 made of an inclined wall is arranged. Further, the lower portion of the partition member 20 is formed with a flared drainage portion 18 that expands outward.

A steam trap is provided at the bottom of the drain chamber 26 as a drain valve 6. A drain outlet 8 is provided at the bottom of the drain chamber 26.
A drain valve opening 28 is formed which leads to an opposing spherical valve float 30 which is freely accommodated therein and covered by a float force bar 32 . A vent hole 34 is opened in the upper part of the float force bar 32. Therefore, when the mixed fluid of steam and condensate flowing in from the eight mouths 12 passes through the annular space 16, its direction is bent by the swirling vanes 24 and the water is swirled, and the moisture is shaken out to the outside and surroundings. The light vapor flows down along the inner wall of the main body into the drainage sump chamber 26, and the light vapor flows out through the central opening of the partition member 20 to the vapor outlet 7.

The valve float 30 floats up and down with the water level in the drain chamber 26 to open and close the drain valve port 28, and automatically discharges the drain accumulated in the drain chamber 26 to the drain outlet 8. In this embodiment, a steam/water separator 4 is shown that integrates a steam/water separating section and a steam trap, but the steam trap is not necessarily necessary, and only the drain from which the steam/water has been separated is discharged from the drain outlet 8. It may be a regular twenty-one dollar valve or a globe valve.

Water droplets generated due to carry-over of the boiler 1 and drain generated due to natural heat radiation in the steam pipe 3 are separated by a steam/water separator 4 and reach an orifice 9.

If there is too much carryover or steam trap 5
3 causes a discharge failure and cannot discharge the condensate, the amount of condensate reaching the orifice 9 increases, and an abnormality in the steam pipe 3 can be detected.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a steam pipe abnormality detection device according to the present invention. 1: Boiler 2: Steam-using equipment 3: Steam pipe
4: Steam separator 5a, 5b: Pressure sensor

Claims (1)

[Claims] 1. A steam separator that separates steam and condensate is placed in the steam pipe, a steam outlet and a drain outlet are provided in the steam pipe, an orifice is installed in communication with the drain outlet, and pressure is detected before and after the orifice. An abnormality detection device for a steam pipe, which includes a flow rate measuring section that measures the amount of fluid passing through an orifice by detecting differential pressure.