JP2001324294A - Condensate discharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a condensate discharger which can suck condensate generated in a steam using apparatus surely without causing any stagnation. SOLUTION: A steam using apparatus 1 is coupled with a steam supply pipe 2 and a pipe 11 branched therefrom is fixed with a motor valve 12 and a steam ejector 9. Suction chamber 10 of the ejector 9 is coupled with the steam using apparatus 1 through a steam trap 4. A pressure sensor 7 fixed to the steam using apparatus is connected electrically with the motor valve 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for discharging condensate produced by condensation of steam in a steam-using device from the steam-using device. Normally, in a steam-using device, condensate generated by heating the steam is quickly discharged out of the device in order to improve the heating efficiency by the steam.

[0002]

2. Description of the Related Art As a conventional condensate discharge device, there has been a device disclosed in Japanese Patent Publication No. 51-31998, for example.
This is because the outlet header of the fin tube type heat exchanger is provided with a combination of a check valve that opens at negative pressure and closes at positive pressure and a thermal valve that opens at low temperature and closes at high temperature. When the pressure rises, the outside air is introduced from this combination valve to create a positive pressure, ensuring a differential pressure between the inlet and outlet of the steam trap, and condensing water as condensed water from the heating device using steam to the outside immediately. Can be discharged to

[0003]

The conventional condensate discharge device described above still has a problem that the condensate in the heating device cannot be quickly discharged to the outside. This is because when the inside of the outlet header becomes negative pressure and the differential pressure between the inlet and outlet of the steam trap disappears and condensate cannot be discharged, the combination valve opens and introduces outside air to bring the inside of the outlet header into atmospheric pressure. In order to secure the pressure difference between the inlet and outlet of the steam trap and discharge the condensate, for example, when the pressure on the outlet side of the steam trap is almost atmospheric pressure, Even if outside air is introduced, a pressure difference between the inlet side and the outlet side of the steam trap can hardly be secured, and condensate cannot be quickly discharged from the steam trap to the outside.

Accordingly, an object of the present invention is to provide a condensate discharge device that does not accumulate condensate by reliably discharging condensate generated in a steam-using device or the like to the outside via a steam trap. It is.

[0005]

Means for solving the above-mentioned problems The present invention has been made to solve the above-mentioned problems. The present invention is directed to a steam-using apparatus in which a steam trap for discharging condensed steam condensed is installed. The outlet side of the ejector is connected to the suction chamber of the ejector, the inlet side of the ejector communicates with the fluid source, and valve means for shutting off the communication between the fluid source and the inlet side of the ejector is arranged. Pressure detecting means for detecting the pressure in the steam-using device is connected, and when the pressure value detected by the pressure detecting means falls below a predetermined value, the valve means is opened to supply the fluid to the ejector.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS When the pressure in the steam-using device detected by the pressure detecting means falls below a predetermined value, the valve means opens and high-pressure fluid is supplied from the fluid source to the ejector, and the suction chamber of the ejector Generates a vacuum suction force. Due to this suction force, the pressure on the outlet side of the steam trap decreases, a pressure difference between the inlet side and the outlet side of the steam trap is secured, and condensate is discharged through the steam trap. Condensate discharged from the steam trap is discharged to the outside through the suction chamber of the ejector.

For example, even when the pressure in the steam-using device drops to about atmospheric pressure, a differential pressure between the inlet and the outlet of the steam trap can be ensured by setting the ejector to a vacuum state lower than atmospheric pressure. Condensate can be quickly discharged through the steam trap.

[0008]

In this embodiment, an example in which a fin tube type heat exchanger is used as the steam-using device 1 will be described. Heat exchanger 1
Supply pipe 2 for supplying steam for heating to the pressure control valve 3
And via a valve 13. A steam trap 4 is attached below the heat exchanger 1. Steam trap 4
Is for automatically returning the condensed water of the steam generated in the heat exchanger 1 as condensed water and air or the like which is a non-condensable gas mixed into the steam to the outside.

The fin tube type heat exchanger 1 is provided with an inlet header 5 and an outlet header 6 on both sides, and steam of a predetermined pressure supplied from the steam supply pipe 2 is supplied from the inlet header 5 to a large number of divided parts (not shown). It is supplied to the inside of the heat exchanger 1 and exchanges heat with a heat exchange object such as air passing therethrough. The heat exchanged steam is condensed and condensed, and reaches the outlet header 6. At the upper part of the outlet header 6, a pressure sensor 7 as pressure detecting means for detecting the pressure inside the outlet header 6 is attached.

A steam trap 4 is connected to a lower portion of the outlet header 6. The outlet side of the steam trap 4 is connected to a suction chamber 10 of an ejector 9 via a pipe 8. Ejector 9
In the present embodiment, an example is shown in which a steam ejector capable of generating a vacuum suction force in the suction chamber 10 using steam as a driving source is used.

A steam branch pipe 11 which is a part of the steam supply pipe 2 is connected to the inlet side of the steam ejector 9. The high-pressure steam supplied from the steam branch pipe 11 serves as a drive fluid source for the ejector 9. An electric valve 12 and a check valve 16 as valve means are provided between the steam supply pipe 2 and the ejector 9 to shut off communication between the two. On the outlet side of the steam ejector 9, a diffuser 14 and a discharge pipe 15 are provided, and the steam trap 4 is provided.
The condensate flowing down from the drain can be discharged to a predetermined location.

Although not shown, the electric valve 12 is electrically connected to the pressure sensor 7 attached to the fin tube type heat exchanger 1 so that the detected pressure value of the pressure sensor 7 becomes lower than a preset value. Then, the electric valve 12 is opened. When the motor-operated valve 12 opens, high-pressure steam is supplied to the ejector 9 to generate a vacuum suction force in the suction chamber 10.

Condensate generated by heat exchange in the fin tube type heat exchanger 1 is sent to the steam trap 4 when the pressure in the outlet line 8 of the steam trap 4 is lower than the pressure in the heat exchanger 1. It flows down naturally, and is further discharged out of the system from the discharge pipe 15 through the suction chamber 10 and the diffuser 14 of the steam ejector 9.

When the pressure of the steam supplied from the pressure control valve 3 is sufficiently high, the pressure in the heat exchanger 1 is maintained at a pressure higher than the atmospheric pressure. In the case of a low pressure higher than the above, the supplied steam may be condensed in the heat exchanger 1 to be in a negative pressure state below the atmospheric pressure. As described above, when the pressure in the heat exchanger 1 decreases, the pressure sensor 7 detects the pressure, and the electric valve 12 is opened to supply high-pressure steam to the ejector 9 and generate a vacuum suction force in the suction chamber 10.

The vacuum suction force generated in the ejector 9 is adjusted to a value lower than the pressure in the heat exchanger 1 by adjusting the pressure and amount of steam to be supplied, so that the pressure between the heat exchanger 1 and the ejector 9 can be reduced. That is, a predetermined pressure difference can be created between the inlet side and the outlet side of the steam trap 4, and the condensate in the outlet header 6 can be quickly discharged through the steam trap 4. The condensate that has passed through the trap 4 is mixed with high-pressure steam by the ejector 9 and reaches a predetermined location from the discharge pipe 15.

In this embodiment, an example is shown in which a fin tube type heat exchanger is used as a steam-using device. However, steam heating is performed at a relatively low temperature, such as with other air handling units, hot air dryers, and hot water production devices. It can be used for things. Further, in this embodiment, an example in which a steam ejector is used as the ejector 9 has been described. However, the drive source of the ejector 9 is not limited to steam. For example, high-pressure compressed air or high-pressure water may be used. Can be.

[0017]

As described above, according to the present invention, only when the pressure on the inlet side of the steam trap decreases and the differential pressure from the outlet side decreases, the valve means opens and the suction force of the ejector is reduced. Thus, a differential pressure between the inlet and the outlet of the steam trap can be created, and condensate generated in the steam-using device can be quickly and reliably discharged out of the system.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a condensate discharge device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steam use apparatus 2 Steam supply pipe 4 Steam trap 7 Pressure sensor 9 Ejector 10 Suction chamber 11 Branch pipe 12 Electric valve

Claims (1)

[Claims] 1. An apparatus in which a steam trap for discharging condensed steam condensed is attached to a steam-using device, an outlet side of the steam trap is connected to a suction chamber of an ejector, and an inlet side of the ejector is connected to a fluid source. Valve means for communicating with the fluid source and the inlet side of the ejector, and connecting the valve means and pressure detecting means for detecting the pressure in the steam-using device to detect pressure. A condensate discharge device characterized in that when the pressure value detected by the means drops below a predetermined value, the valve means is opened to supply fluid to the ejector.