JP2004138255A - Steam heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steam heat exchanger capable of promptly discharging condensation generated in an interior of the heat exchanger to the outside. <P>SOLUTION: A steam supply pipe 2 is connected to an inlet header 7 of a multistage press 1. An inlet side pressure sensor 3 is attached to an upper part of the inlet header 7. An outlets side pressure sensor is attached to an upper part of an outlet header 10, and a control valve 5 is connected below it. The control valve 5 is communicated with a gas-liquid separator 12. An ejector 18 and a circulating pump 19 is connected below the gas-liquid separator 12. An excessive condensation discharge pipe 21 is connected to a thermomagnetic engine 25. By controlling opening and closing of the control valve 5 in response to a detection value from each pressure sensor 3 and 4, a predetermined differential pressure is maintained, and the condensation generated in the multistage press 1 is quickly discharged. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a steam heat exchange device that can quickly discharge condensate generated inside a heat exchange device to the outside without staying inside.
[0002]
[Prior art]
[Patent Document 1] Japanese Patent Publication No. 51-31998 discloses an air heating device 1 as a heat exchange device which includes a check valve which opens at negative pressure and closes at positive pressure, and a thermal valve which opens at low temperature and closes at high temperature. By providing the combination valve 7, condensed water generated as condensed water generated inside the air heating device 1 can be discharged to the outside.
[0003]
[Problems to be solved by the invention]
In the above-mentioned conventional heat exchange device, when the inside of the device becomes vacuum, the outside air is injected from a check valve to prevent the differential pressure acting on the steam trap from becoming negative pressure, so that condensate is discharged from the steam trap. In this way, even if the outside air is injected, the atmospheric pressure acts on the inlet side of the steam trap, and there is a sufficient difference between the inlet side and the outlet side of the steam trap. There was a problem that the generated condensed water could not be quickly discharged to the outside because the pressure could not be secured.
[0004]
In view of this situation, an object of the present invention is to provide a steam heat exchange device that can quickly discharge condensate generated inside the heat exchange device to the outside.
[0005]
[Means for Solving the Problems]
Means of the present invention taken to solve the above-mentioned problem is to supply steam as a heating source and discharge condensate condensed by steam through heat exchange to the outside of the heat exchange device. An inlet-side pressure sensor that detects the inlet-side fluid pressure and an outlet-side pressure sensor that detects the outlet-side fluid pressure are arranged, and an automatic adjustment valve is attached downstream of the outlet-side pressure sensor. And a control unit that controls the opening and closing of the automatic control valve so that the pressure difference between the inlet side and the outlet side of the heat exchange device is maintained at a predetermined value by inputting the detected pressure value.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
A predetermined pressure difference is maintained at the inlet side and the outlet side of the heat exchange device by controlling the opening and closing of the automatic control valve so that the pressure difference between the inlet side and the outlet side of the heat exchange device is maintained at a predetermined value by the control unit. The condensate generated inside the heat exchange device is quickly discharged to the outside based on the predetermined pressure difference.
[0007]
【Example】
In FIG. 1, a multi-stage press 1 as a heat exchange device, a steam supply pipe 2 for supplying steam to the multi-stage press 1, an inlet-side pressure sensor 3, an outlet-side pressure sensor 4, and a downstream side of the outlet-side pressure sensor 4. A steam heat exchange device is constituted by the attached automatic control valve 5.
[0008]
The steam supply pipe 2 is provided with a steam pressure control valve 6 capable of arbitrarily setting the steam pressure to be supplied, and is connected to the inlet header 7 of the multi-stage press 1. The inlet header 7 and the plurality of hot plates for press 8 are connected via respective substantially U-shaped flexible tubes 9. Similarly, the outlet header 10 and the hot plate for press 8 are connected by the flexible tube 11. The steam supplied from the steam supply pipe 2 reaches the hot plate 8 from the inlet header 7 and the flexible tube 9, and is condensed by heating a heat exchange object (not shown) located between the plurality of hot plates 8. The water is condensed and discharged to the outside through the flexible tube 11 and the outlet header 10.
[0009]
The inlet side pressure sensor 3 is mounted on the upper part of the inlet header 7, and the outlet side pressure sensor 4 is mounted on the upper part of the outlet header 10. The automatic control valve 5 is connected to the lower part of the outlet header 10. A gas-liquid separator 12 that separates steam and condensate into gas and liquid is connected to the downstream side of the automatic control valve 5. Above the gas-liquid separator 12, a low-pressure steam pipe 14 is connected via an automatic control valve 13.
[0010]
The low-pressure steam pipe 14 is for supplying the steam separated by the gas-liquid separator 12 to a separate steam use location (not shown), and a pressure sensor 15 for detecting a steam pressure in the pipe is provided on the way. The steam supply pipe 2 is connected to a branch pipe 16 through a pressure control valve 17. When the amount of steam supplied from the gas-liquid separator 12 to the low-pressure steam pipe 14 is small, a predetermined amount of steam can be supplied to the low-pressure steam pipe 14 from the branch pipe 16.
[0011]
A liquid ejector 18 is connected to a lower part of the gas-liquid separator 12 and communicates with a circulation pump 19 through a circulation path 20. The condensed water separated by the gas-liquid separator 12 is sucked by the ejector 18 and circulates in the circulation path 20. A part of the circulation path 20 is branched to connect a surplus condensate discharge pipe 21. An automatic valve 22 is attached to the surplus condensate discharge pipe 21.
[0012]
A control unit (not shown) is electrically connected to each of the sensors 3, 4, 15, and each of the valves 5, 6, 13, 17, 22, and 23, and each of the valves is controlled by a signal from the control unit. Control the opening / closing or valve opening.
[0013]
In this embodiment, a thermomagnetic engine 25 is attached to the excess condensate discharge pipe 21. As disclosed in, for example, Japanese Patent Application Laid-Open No. 9-268968, the thermomagnetic engine 25 rotates by utilizing a temperature difference between a high temperature of the condensate flowing from the surplus condensate discharge pipe 21 and a normal temperature in the atmosphere. The generated torque is transmitted to the generator 26 to generate electricity. The condensed water whose heat has been removed by the thermomagnetic engine 25 is discharged to the outside through the discharge pipe 27. The electricity generated by the generator 26 is used as a power source for driving the multi-stage press 1, the pump 19 and the respective valves, or the sensors 3, 4, 15 and the control unit.
[0014]
The steam supplied from the steam supply pipe 2 to the multi-stage press 1 is subjected to heat exchange in the plurality of hot plates 8 to be condensed, and reaches the gas-liquid separator 12 through the outlet header 10 and the automatic control valve 5. In this case, the control unit automatically controls the pressure difference between the inlet side and the outlet side of the multi-stage press 1, that is, the pressure difference between the inlet header 7 side and the outlet header 10 side to a predetermined value, for example, about 0.01 MPa to 0.03 MPa. By controlling the opening and closing of the control valve 5 or the opening degree of the control valve, the condensed water generated in the multi-stage press 1 quickly flows down to the gas-liquid separator 12 without staying.
[0015]
When the hot plate 8 and the outlet header 10 are connected by the substantially U-shaped flexible tube 11 as in the present embodiment, the downstream side of the flexible tube 11 becomes a rising passage, and a differential pressure enough to break the water head height is obtained. Without this, the condensate cannot be discharged. However, by appropriately setting the predetermined pressure difference as described above, the condensate can be quickly discharged to the outside even if there is a rising portion.
[0016]
The condensed water as a liquid and the re-evaporated steam as a gas are separated by the gas-liquid separator 12, and the steam is supplied from the low-pressure steam pipe 14 to a predetermined low-pressure steam use point, while the condensate is sent to the ejector 18 It is sucked and supplied from the excess condensate discharge pipe 21 to the thermomagnetic engine 25.
[0017]
【The invention's effect】
According to the present invention as described above, by maintaining the pressure difference between the inlet side and the outlet side of the heat exchange device at a predetermined value, the condensate generated inside the heat exchange device can be quickly discharged to the outside. it can.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of a steam heat exchange device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Multi-stage press 2 Steam supply pipe 3 Inlet pressure sensor 4 Outlet pressure sensor 5 Automatic control valve 7 Inlet header 8 Hot plate 9, 11 Flexible tube 12 Gas-liquid separator 14 Low-pressure steam pipe 18 Liquid ejector 21 Excess condensate discharge pipe 25 Thermomagnetic engine 26 Generator

Claims (1)

In the case of supplying steam as a heating source and discharging condensate condensed by the heat exchange to the outside of the heat exchange device, an inlet pressure sensor for detecting a fluid pressure at an inlet side of the heat exchange device and an outlet pressure sensor at an outlet side are provided. An outlet pressure sensor for detecting the fluid pressure is arranged, an automatic control valve is attached downstream of the outlet pressure sensor, and the pressure values detected by the two sensors are input and the inlet and outlet of the heat exchange device are input. A control unit for controlling the opening and closing of the automatic control valve so as to maintain the pressure difference on the side of the steam at a predetermined value.

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