JPH0320196A - Malfunction detector for steam pipe - Google Patents

Abstract

PURPOSE:To prevent such a possibility that drain continues to flow into a steam service apparatus and a water hammer is produced from occurring by installing a tank in a drain outlet installed in a steam separator, connecting an air vent valve to an upper part of the tank, and providing a pressure detecting means which detects the opening or closing of this valve. CONSTITUTION:Drain separated by a steam separator 4 flows into a tank 5, and air in the tank replaced with the drain and reevaporated steam of partial drain are exhausted to the outside of the tank 5 from an air vent valve 10 installed on the tank 5, so that the drain is collected in the tank 5. Then they are reached to the air vent valve 10 filled up the inside of the tank with the drain, the valve is opened, coming to closed state, going up to pressure almost equal to the inside of the steam pipe 3. This pressure rise is detected by a pressure sensor 9, finding a fact that whether the inside of the tank 5 is filled up with the drain or not, and time of up to this fillingness is measured whereby the drain quantity is measured. With the drain quantity measured like this, whether the steam pipe 3 is a steady state or an abnormal state can be detected.

Description

Detailed Description of the Invention Industrial Field of Application The present invention separates condensate generated in steam pipes from steam and measures the separated condensate to detect 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 forcefully discharge condensate. It is common practice to exclude

<Problem to be solved by the present invention> There is a natural limit to the separation capacity of a steam/water separator, and even if drain exceeding the limit flows in due to an abnormality in the steam pipe, the above device cannot detect the abnormal state. There was a problem that condensate continued to flow into steam-using equipment.

In addition to the above-mentioned carryover and steam trap discharge failure, the causes of the occurrence of a large number of ants in the drain include failure to maintain heat in the steam pipe.

The technical problem of the present invention is to detect steam pipe abnormalities, such as boiler carryover, steam trap discharge failure, and steam pipe heat retention failure, by measuring the separate drain loss of the steam pipe. 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 A tank with a fixed volume is provided in communication with the outlet, and an air vent valve that discharges gas but not liquid is connected to the upper part of the tank to detect whether the air vent valve is in an open or closed state. It is equipped with pressure detection means.

Effect> By providing a tank with a constant volume in communication with the drain outlet of the steam/water separator, the drain separated by the steam/water separator flows into the tank. Air in the tank replaced with drain,
The re-evaporated steam generated by the re-evaporation of a portion of the condensate is discharged from the tank through an air vent valve provided at the top of the tank, and the condensate is collected inside the tank. When the tank is filled with condensate and the condensate reaches the air vent valve, the air vent valve closes without discharging the liquid.

When the air vent valve closes, the tank becomes airtight.
The pressure rises to almost the same as that in the steam pipe.

By detecting this pressure increase with the pressure detection means, it can be determined whether the tank is filled with drain or not. By measuring the time from when drain starts flowing into the tank until it is filled using a conventionally well-known method, it is possible to measure the drain wall separated by the steam-water separator. Therefore,
By measuring the amount of drain, it is possible to detect whether the steam pipe is in a steady state or in an abnormal state.

<Effects of the Invention> It is possible to detect abnormal conditions in steam pipes, and by correcting carryover, steam trap discharge failure, and steam pipe heat retention failure, which are the main causes of abnormal conditions, it is possible to prevent drains from steam-using equipment. It is possible to prevent water from flowing in, thereby preventing a decrease in the productivity of steam-using equipment, and also preventing water hammer.

In addition, the operational status of the boiler and the steam trap can also be monitored by simply measuring the separated condensate in a tank with a constant volume.

<Example> An example showing a specific example of the above technical means will be described. (
(See Figure 1) A steam separator 4 is attached to the steam pipe 3 that supplies steam generated in the boiler 1 to the steam-using equipment 2. The steam/water separator 4 is provided with a steam outlet 7 and a drain outlet 8, the steam outlet 7 communicating with the steam using equipment 2, and the drain outlet 8 communicating with the tank 5 having a constant volume. A three-way valve 6 is disposed between the drain outlet 8 and the tank 5 so as to communicate with the tank 5 only during measurement.

A pressure sensor 9 as pressure detection means is attached to the tank 5. An air vent valve 10 is connected to the top of the tank 5. The air vent valve 10 has an inlet 67, a valve chamber 61, and an outlet 6.
8, a hollow float 60 is disposed inside the valve chamber 61, and when gas such as steam or air flows into the valve chamber 61, the float 60 moves downward (indicated by the solid line in FIG. 1). @
), and the valve port 62 is opened to discharge steam and air, but when condensate flows in, the float 60 floats up (the position shown by the two-dot chain line in FIG. 1), and the valve port 62 is opened.
Close the drain to prevent drain from flowing out. 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 drain outlet 8 in a main body 11, and a cylindrical partition member 20 is attached to communicate with the eight ports 12. It forms an annular 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 56. 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 part of the partition member 20 forms a flared drainage portion 18 that expands outward.

A steam trap is formed as a drain valve 56 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 chamber 26, and a spherical valve float 30 is accommodated in a free state on the opposite side, and covered with 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 inlet 12 passes through the annular space 16, its direction is bent and swirled by the swirling vanes 24, and since the moisture content is larger than that of steam, it is shaken out and surrounded. 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 normal 21 dollar valve or a globe valve.

When measuring the amount of condensate mixed into the steam pipe 3, the three-way valve 6
to connect the drain outlet 8 and the tank 5. Drain from the steam pipe 3 is separated from steam by a steam separator 4, and is led from a drain outlet 8 to a tank 5 via a drain valve 28. Part of the air and drain in the tank 5 re-evaporate and the re-evaporation steam generated is discharged outside the system from the air vent valve 10.
Drain collects in tank 5. In this case, the inside of the tank 5 communicates with the atmosphere outside the system via the air vent valve 10, and the pressure is approximately atmospheric pressure. When the tank 5 is filled with drain and the drain reaches the valve chamber 61 of the air vent valve 10, the hollow float 60 floats up and closes the valve port 62.

When the valve port 62 closes, the inside of the tank 5 becomes airtight, and the pressure rises to almost the same level as that of the steam pipe 3. This pressure increase is detected by a pressure sensor 9. Therefore, the amount of condensate that has entered the steam pipe 3 can be ascertained by measuring the time from when condensate begins to flow into the tank 5 to when the pressure rise is detected using a conventionally known method such as a timer. , an abnormality in the steam pipe 3 can be detected.

In this embodiment, the pressure sensor 9 is provided directly in the tank 5, but it may also be provided in communication with the outlet 68 side of the air vent valve 10. That is, in FIG. 1, an outlet pipe 90 may be connected to the outlet 68 of the air vent valve 10, a throttle 91@ may be provided at one end of the outlet pipe 90, and a pressure sensor 92 may be attached as a pressure detecting means. in this case,
When the air vent valve 10 is open, the pressure between the air vent valve 10 and the throttle 91 is higher than atmospheric pressure.
When 0 closes, the pressure becomes equal to atmospheric pressure, so
It is possible to detect whether the air vent valve 10 is in an open state or a closed state. Additionally, in this case, by providing the throttle 91, the pressure between the inside of the tank 5 and the throttle 91 can be maintained at a pressure higher than atmospheric pressure, reducing re-evaporation of drain and measuring the amount of drain more accurately. be able to.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of the steam pipe abnormality detection device of the present invention. 1 Boiler 2. Steam-using equipment 3: Steam pipe
4 Steam water separator 5: Tank 6
Three-way valve7. Steam outlet 8 Drain outlet 9. Pressure sensor 10 Air vent valve 12 Population 1
6 Annular space 20: Partition member 24: Swirl vane 90: Outlet pipe 91: Aperture

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, and a tank with a constant volume is provided in communication with the drain outlet. An abnormality detection device for a steam pipe, which is connected to an air vent valve that discharges gas but not liquid, and is provided with pressure detection means for detecting whether the air vent valve is in an open or closed state.