JP4509301B2 - Condensate discharge device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for discharging condensate produced by condensation of steam in a steam using apparatus from the steam using apparatus, and particularly, even if the amount of supplied steam decreases and the pressure inside the steam using apparatus decreases. The present invention relates to a condensate discharge device capable of reliably discharging water. Usually, in a steam using apparatus, in order to improve the heating efficiency by steam, the condensate generated by heating the steam is quickly discharged out of the apparatus.
[0002]
[Prior art]
As a conventional condensate discharging apparatus, for example, there is one disclosed in Japanese Patent Publication No. 51-31998. This is because the outlet header of the finned tube 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 reaches, the outside air is introduced from this combination valve to a positive pressure to ensure a differential pressure between the inlet and outlet of the steam trap, and the condensate as condensate is quickly removed from the heating device using steam. Can be discharged.
[0003]
[Problems to be solved by the invention]
In the conventional condensate discharging apparatus, there is still a problem that the condensate in the heating apparatus cannot be quickly discharged to the outside. This is because when the pressure inside the outlet header becomes negative and the differential pressure at the inlet and outlet of the steam trap disappears and the condensate cannot be discharged, the combination valve opens and introduces outside air to bring the outlet header to atmospheric pressure. By returning it, it is intended to discharge the condensate while ensuring the differential pressure at the inlet and outlet of the steam trap.For example, when the pressure on the outlet side of the steam trap is almost atmospheric, the outside air from the combination valve However, the pressure difference between the inlet side and the outlet side of the steam trap can hardly be ensured, and therefore the condensate cannot be quickly discharged from the steam trap to the outside.
[0004]
Accordingly, an object of the present invention is to obtain a condensate discharge device that does not retain condensate by reliably discharging the condensate generated by a steam using device or the like to the outside through a steam trap.
[0005]
[Means for Solving the Problems]
The means of the present invention devised to solve the above-mentioned problem is that a steam supply pipe is connected to the steam using device via a valve, and a steam trap for discharging condensate condensed with steam in the steam using device is provided. In the attached one, a valve opening degree detecting means for detecting the opening degree of the valve attached to the steam supply pipe is provided, the outlet side of the steam trap is connected to the suction chamber of the ejector, and the inlet side of the ejector is communicated with the fluid source. In addition, a valve means for disconnecting communication between the fluid source and the inlet side of the ejector is disposed, and the steam supply pipe detected by the valve opening degree detecting means is connected by connecting the valve means and the valve opening degree detecting means. The valve means on the ejector inlet side is cut off in accordance with the valve opening degree.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
When the opening degree of the valve attached to the steam supply pipe is detected by the valve opening degree detecting means, and the valve opening degree is reduced to a predetermined value or fully closed, the valve means on the ejector inlet side is opened. A high-pressure fluid is supplied from the fluid source to the ejector, and a vacuum suction force is generated in the suction chamber of the ejector. This suction force reduces the pressure on the outlet side of the steam trap, ensures a pressure difference between the inlet side and the outlet side of the steam trap, and condensate is discharged through the steam trap. Condensate discharged from the steam trap is discharged outside through the suction chamber of the ejector.
[0007]
For example, even when the pressure in the steam using device drops to about atmospheric pressure, the pressure difference between the inlet and outlet of the steam trap can be secured by setting the vacuum state below the atmospheric pressure with the ejector. The condensate can be discharged quickly via
[0008]
【Example】
In the present embodiment, an example in which a fin tube type heat exchanger is used as the steam using device 1 is shown. A steam supply pipe 2 for supplying steam for heating to the heat exchanger 1 is connected via a pressure control valve 3 and a valve 13 as a valve for arbitrarily adjusting the supply amount. The pressure control valve 3 includes a potentiometer, a rotary encoder, etc. as valve opening degree detection means (not shown). A steam trap 4 is attached below the heat exchanger 1. The steam trap 4 automatically discharges condensate as condensed water of steam generated in the heat exchanger 1 or air that is a non-condensable gas mixed in the steam to the outside.
[0009]
The finned tube heat exchanger 1 includes an inlet header 5 and an outlet header 6 on both sides, and a plurality of heat exchangers in which steam of a predetermined pressure supplied from the steam supply pipe 2 is divided from the inlet header 5 (not shown). 1 is supplied to the inside and exchanges heat with a heat exchange object such as air passing therethrough. The heat-exchanged steam is condensed to condensate and reaches the outlet header 6.
[0010]
A steam trap 4 is connected to the lower part of the outlet header 6. The outlet side of the steam trap 4 is connected to the suction chamber 10 of the ejector 9 via a pipe line 8. In this embodiment, the ejector 9 is an example using a steam ejector that can generate a vacuum suction force in the suction chamber 10 using steam as a drive source.
[0011]
A steam branch pipe 11 that branches a part of the steam supply pipe 2 is connected to the inlet side of the steam ejector 9. 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 are provided as valve means between the steam supply pipe 2 and the ejector 9 to cut off communication between them. A diffuser 14 and a discharge pipe 15 are provided on the outlet side of the steam ejector 9 so that the condensate flowing down from the steam trap 4 can be discharged to a predetermined location.
[0012]
The motor-operated valve 12 and the pressure control valve 3 are electrically connected to the controller 7 respectively. The valve opening degree detecting means built in the pressure control valve 3 detects the valve opening degree of the pressure control valve 3 and opens the motor-operated valve 12 when the valve opening degree set in advance in the controller 7 becomes smaller. It is.
[0013]
Condensate produced by heat exchange in the finned tube heat exchanger 1 has a relatively large opening amount of the pressure control valve 3 and a large amount of steam is supplied, and the pressure in the heat exchanger 1 is steam trapped. If the pressure is higher than the pressure on the outlet line 8 side of the steam outlet 4, it naturally flows down to the steam trap 4, and is further discharged from the discharge pipe 15 through the suction chamber 10 and the diffuser 14 of the steam ejector 9. Thus, when the valve opening degree of the pressure control valve 3 is relatively large, the motor-operated valve 12 is closed.
[0014]
When the amount of steam supplied from the pressure control valve 3 is sufficiently large, the pressure in the heat exchanger 1 is maintained at a high pressure equal to or higher than the atmospheric pressure, but the valve opening degree of the pressure control valve 3 is reduced. When the supply amount of steam decreases, the amount of steam condensed in the heat exchanger 1 may increase more than the amount of supplied steam, resulting in a negative pressure state below atmospheric pressure. For example, there are many cases where the inside of the heat exchanger 1 becomes negative pressure when the opening degree of the control valve 3 is reduced to about 25% or less. Thus, the valve opening degree detection means built in the pressure control valve 3 detects that the valve opening degree of the pressure control valve 3 becomes small and the pressure in the heat exchanger 1 becomes low, and the electric valve 12 is turned on. By opening the valve, high-pressure steam is supplied to the ejector 9 and a vacuum suction force is generated in the suction chamber 10.
[0015]
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 the supplied steam, that is, between the heat exchanger 1 and the ejector 9, 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. Condensate that has passed through the trap 4 is mixed with high-pressure steam by an ejector 9 and reaches a predetermined location from a discharge pipe 15.
[0016]
In this embodiment, an example using a fin tube type heat exchanger as a steam using device has been shown. However, it is used for other air handling units, hot air dryers, hot water producing devices, etc. that are steam heated at a relatively low temperature. be able to. In the present embodiment, an example in which a steam ejector is used as the ejector 9 is shown. However, the drive source of the ejector 9 is not limited to steam, and for example, high-pressure compressed air or high-pressure water is used. be able to.
[0017]
【The invention's effect】
As described above, according to the present invention, when the valve opening degree of the pressure control valve is reduced and the pressure on the inlet side of the steam trap decreases and the differential pressure with respect to the outlet side decreases, the valve means opens. Thus, the differential pressure between the inlet and outlet of the steam trap can be created by the suction force of the ejector, and the 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 discharging apparatus according to the present invention.
[Explanation of symbols]
1 Steam Use Device 2 Steam Supply Pipe 3 Pressure Control Valve 4 Steam Trap 9 Ejector 10 Suction Chamber 11 Branch Pipe 12 Motorized Valve

Claims (1)

When the steam supply pipe is connected to the steam using device via a valve and a steam trap for discharging the condensed condensate of the steam is attached to the steam using device, the opening degree of the valve attached to the steam supply pipe is A valve opening detection means for detecting is provided, the outlet side of the steam trap is connected to the suction chamber of the ejector, the inlet side of the ejector is communicated with the fluid source, and the fluid source is communicated with the inlet side of the ejector. A valve means for blocking is arranged, and the valve means and the valve opening degree detecting means are connected, and the valve means on the ejector inlet side is communicated according to the valve opening degree of the steam supply pipe detected by the valve opening degree detecting means. Condensate drainage device characterized by blocking.

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