JPH09112808A - Condensation recovery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a condensation recovery device in which a heat radiation loss from a water feed tank is decreased and a cavitation is not generated by a water feed pump. SOLUTION: A steam trap 3 is connected to an ejector 5 through a header 4. A temperature sensor 17 is attached to a water feed tank 11 to which a cooling water supply pipe 16 is connected through an automatic control valve 15. The temperature sensor 17 and the automatic control valve 15 are respectively connected to a temperature controller 18. The lower part of the water feed tank 11 is connected to the header 4 through a pipeline 19, an injection pump 20 and an automatic valve 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condensate recovery system for recovering condensate as condensed water generated in steam-using equipment to a boiler or the like. Condensate generated in equipment using steam is generally discharged through a steam trap. The discharged condensate is usually high-pressure steam condensate, which is still hot thermal energy.
The condensate is collected in order to make effective use of this thermal energy.

[0002]

2. Description of the Related Art A conventional condensate recovery system will be described with reference to FIG. Condensate as condensed water is generated by the steam-using device 2 consuming the high-pressure steam generated in the boiler 1, and the condensed water reaches the header 4 through the steam trap 3. By communicating the upper part of the header 4 with the water supply tank 11 through the primary pressure regulating valve 13 and the pipe line 14, when the internal pressure of the header 4 rises above a predetermined level, the primary pressure regulating valve 13 opens and its pressure increases. Is removed to form a pressure gradient so that the condensate does not stay in the steam-using device 2. The header-4 is connected to the ejector 5 and the circulation pump 7 is connected through the circulation path 6.
Communicate with The circulation pump 7, the ejector 5, and the circulation path 6 constitute a condensate recovery pump. The circulation path 6 is branched to be connected to the condensate water recovery pipeline 8, and a part of the circulation path 6 is connected via a valve 9 to the boiler.
1 is connected to the water supply tank 11 through the valve 10.

By circulating the condensate with the circulation pump 7, a suction force is generated in the ejector 5 to suck the condensate from the header 4 and to suck the condensate into the boiler-1.
Alternatively, the water is collected in the water supply tank 11, and the condensate in the water supply tank 11 is further collected in the boiler 1 by the water supply pump 12 so that the heat energy is effectively used.

[0004]

In the above-mentioned conventional apparatus, when a large amount of high-temperature condensate is collected, the water supply tank 11
The liquid temperature inside rises excessively and a large amount of condensate from the water supply tank 11 evaporates into the atmosphere as re-evaporated vapor, causing a loss of thermal energy, or the fluid temperature is high and the water supply pump 12 There was a problem that the cavitation caused the pump to generate noise, vibrate, or corrode.

Since the water supply tank 11 is usually installed in a state of being open to the atmosphere, a large amount of re-evaporated steam is generated when high-temperature condensate is accumulated. Further, when the temperature of the fluid in the water supply pump 12 is usually about 80 ° C. or higher, vapor bubbles are generated in the pump to cause cavitation.

Therefore, a technical problem of the present invention is that even when a large amount of high-temperature condensate is recovered, the generation of re-evaporated steam from the water supply tank is reduced to suppress the heat energy loss, and the water supply pump is used to cavitation. -To obtain a condensate recovery system that does not cause bleeding.

[0007]

The constitution of the condensate recovery apparatus of the present invention is as follows. Condensate generated from steam-using equipment is pumped to a condensate recovery destination such as a boiler or a water supply tank by a condensate recovery pump, and a cooling water supply pipe for supplying cooling water to the water supply tank and the inside of the water supply tank A temperature detecting means for detecting the liquid temperature is provided to maintain the liquid temperature in the water supply tank at a predetermined temperature, and a tank fluid injecting means for injecting the fluid in the water supply tank to the condensate inflow side of the condensate recovery pump. It is provided.

[0008]

With the temperature detecting means and the cooling water supply pipe, the temperature of the fluid in the water supply tank is set to a predetermined temperature, for example, 60 to 70 degrees C
By maintaining the level to a certain extent, re-evaporation of the condensate from the water supply tank can be suppressed, and cavitation does not occur in the water supply pump.

By injecting the fluid in the water supply tank of a predetermined temperature into the condensate inflow side of the condensate recovery pump, a pressure gradient according to the temperature difference is generated between the steam-using device and the steam trap and the condensate recovery pump. This pressure gradient allows the condensate discharged from the steam-using device and the steam trap to be sucked into the condensate recovery pump without staying in the smoose.

[0010]

Embodiments of the present invention will be described in detail with reference to FIG. In this embodiment, the same members as those of the conventional technique shown in FIG.

A header 4 is connected to the outlet side of the steam-using device 2 via a steam trap 3. The header 4 and the ejector 5 are connected to each other, and the ejector 5 is connected to the circulation pump 7 via the circulation path 6. The ejector 5, the circulation path 6, and the circulation pump 7 constitute a condensate water recovery pump. The circulation line 6 is branched to connect the condensate water recovery pipe line 8 to the boiler 1 via the valve 9 and to the upper part of the water supply tank 11 via the valve 10. The upper portion of the water supply tank 11 is open to the atmosphere. A water supply pump 12 is arranged between the water supply tank 11 and the boiler 1. The water supply pump 12 is driven when the water level in the boiler 1 is lowered to a low water level, and supplies the low temperature condensate in the water supply tank 11 to the boiler 1.

A cooling water supply pipe 16 is connected to the upper portion of the water supply tank 11 via an automatic control valve 15. At the lower part of the water supply tank 11, a temperature sensor 17 as temperature detecting means for detecting the temperature of the fluid in the tank is attached. Temperature sensor-1
7 and the automatic control valve 15 are respectively connected to the temperature controller 18 to control the liquid temperature in the water supply tank 11 within a predetermined temperature range.

The lower part of the water supply tank 11 is connected to the upper part of the header 4 through the conduit 19, the injection pump 20 and the automatic valve 21. These lines 19, infusion pump 20, and automatic valve 2
1 and the tank fluid injection means. In this embodiment, an example in which the fluid in the water supply tank 11 is injected into the upper portion of the header-4 has been shown, but without using the header, it is possible to inject it into the conduit between the steam trap 3 and the ejector 5. Alternatively, instead of the header 4, a closed tank may be arranged and injected into it.

Next, the operation will be described. Condensate generated in the steam-using device 2 reaches the header 4 via the steam trap 3 and is sucked by the ejector 5, and a part of the condensate is circulated in the circulation path 6 by the circulation pump 7, and part of the condensate is condensed. Collection line 8
Then, it is supplied to the boiler 1 through the valve 9 and becomes steam again to be supplied to the steam using device 2.

The liquid temperature in the water supply tank 11 is a temperature sensor-1.
The temperature is detected at 7, and the temperature is maintained at a predetermined temperature, for example, 60 ° C. by the temperature controller 18 and the automatic control valve 15. Therefore, a large amount of re-evaporated vapor is not emitted from the upper part of the water supply tank 11, and the water supply pump 12 does not cause cavitation.

The fluid whose temperature is controlled to a predetermined temperature in the water supply tank 11 is supplied from the conduit 19, the injection pump 20 and the automatic valve 21 to the header-4 to lower the temperature inside the header-4 to a predetermined temperature. When the temperature inside the header-4 is lowered to a predetermined temperature, a temperature gradient between the steam using device 2 and the header-4,
That is, a pressure gradient is created, and the condensate generated in the steam using device 2 flows down into the header 4 through the steam trap 3 without staying.

[0017]

The present invention has the following effects. By maintaining the fluid temperature in the water supply tank at a specified value, it is possible to prevent the large amount of re-evaporated vapor from escaping from the water supply tank and prevent the loss of heat energy. It never happens.

By injecting the fluid of the water supply tank having a predetermined temperature into the condensate inflow side of the condensate recovery pump by the tank fluid injecting means, the pressure gradient required between the steam using device and the steam trap and the condensate recovery pump. The condensate generated in the steam-using device can be sucked into the steam smoothly through the steam trap by the condensate recovery pump, and the condensate does not stay in the steam-using device.

[Brief description of the drawings]

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

FIG. 2 is a configuration diagram of a condensate water recovery device of a conventional example.

[Explanation of symbols]

 1 Boiler 2 Steam-using equipment 3 Steam trap 4 Header-5 Ejector 6 Circulation path 7 Circulation pump 8 Condensate recovery pipeline 11 Water tank 12 Water pump 16 Cooling water supply pipe 17 Temperature sensor 18 Temperature controller 20 Injection pump

Claims (1)

[Claims] 1. A cooling water supply pipe for supplying cooling water to a water tank, wherein condensed water generated by steam-using equipment is pressure-fed to a condensate recovery destination such as a boiler or a water tank by a condensate recovery pump. , Providing temperature detecting means for detecting the liquid temperature in the water supply tank to maintain the liquid temperature in the water supply tank at a predetermined temperature and inject the fluid in the water supply tank to the condensate inflow side of the condensate recovery pump A condensate recovery device comprising tank fluid injection means.