JP2000304468A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat exchanger which surely prevents noncondensing gas from flowing into the heat exchanger by means of a check valve in a state where counterpressure exceeding the pressure of given head height is imposed, and which is able to discharge the noncondensing gas outside in a state where supplied steam contains such noncondensing gas. SOLUTION: An atmospheric air releasing pipe 4 is provided to the inside of a heat exchanger 1. The upper portion of the pipe 4 is provided with a check valve 20 incorporated therein with a float 24. The lower portion of the pipe 4 is fixed with an overflow pipe 3 so that the vertical movement thereof can be controlled. Reverse flow of air into the heat exchanger 1 is prevented by the check valve 20, and noncondensing gas collected to the inside of the heat exchanger 1 can be discharged outside by lowering the fixing position of the overflow pipe 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam generator that heats and condenses remaining steam used in various steam-using devices and re-evaporated steam generated from a high-temperature drain with a cooling fluid such as water. The present invention relates to a method for effectively utilizing the retained heat of steam by eliminating steam that can accumulate therein, or separately using warm water whose temperature has been increased by heat exchange of a cooling fluid.

[0002]

2. Description of the Related Art A conventional heat exchanger of this type is disclosed, for example, in JP-A-60-120186. This is achieved by installing a cooling pipe inside a heat recovery chamber having a steam supply port, connecting the air release section to this heat recovery chamber, and storing condensate in the air release section and the lower part of the heat recovery chamber.
This prevents the non-condensable gas, for example, air, from flowing into the heat recovery chamber from the outside, thereby enabling efficient heat exchange.

[0003]

In the above-mentioned conventional heat exchanger, only the pressure difference corresponding to the pressure corresponding to the head height of the stored condensate is reduced by air or the like from the outside of the heat recovery chamber. Although it is possible to prevent the inflow of condensed gas, if a reverse pressure exceeding the pressure at the head height is applied, the head of the condensed liquid is broken, and non-condensable gas such as air from the outside of the heat recovery chamber There was a problem of inflow.

[0004] In the above-described conventional apparatus, the counter pressure corresponding to the predetermined differential pressure can maintain the head height to prevent the inflow of non-condensable gas from the outside into the heat recovery chamber. If the non-condensable gas is mixed in the steam supplied from the steam supply port, there is a problem that the non-condensable gas flows into the heat exchange container together with the steam. If non-condensable gas such as air is mixed in the steam, the heat transfer efficiency of the steam is significantly reduced. For example, at the outlet side of a steam-using device such as a blower or a shrink tunnel, steam containing a large amount of air is discharged.

[0005] Therefore, an object of the present invention is to prevent the inflow of non-condensable gas without fail even when a reverse pressure exceeding the pressure at the head height is applied, and to prevent the non-condensable gas from being supplied to the steam. It is an object of the present invention to obtain a heat exchanger capable of discharging air in the heat exchanger to the outside as much as possible even when mixed.

[0006]

Means taken to solve the above-mentioned problem is to provide a heat exchange container with an atmosphere opening portion,
A liquid having a predetermined head height is stored in the open-to-atmosphere section and a lower portion of the heat exchange container to prevent inflow of non-condensable gas such as air into the heat exchange container, and to perform heat exchange of steam with a cooling fluid. A water head height adjusting means capable of arbitrarily adjusting a water head height of an air opening part and a lower part of a heat exchange vessel, and a float movable up and down in the air opening part; And a check valve provided with a valve seat opposite to the valve seat.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS By providing a vertically movable float and a check valve having a valve seat opposed to the float at the open-to-atmosphere section, when air reaches the float from the open-to-atmosphere section, When the float is pushed up from the valve seat by this air flow, the air is discharged to the outside through the check valve, but when the air flows into the float from the outside, the float is seated on the valve seat to release the atmosphere. Air is prevented from flowing into the heat exchange container through the section.

[0008] The head height adjustment means to adjust the head height,
By making the head lower than the head height corresponding to the supplied steam pressure, the non-condensable gas such as steam and air breaks this low head and passes through the atmosphere opening and the check valve, or the head height adjustment means. Is discharged to the outside.

[0009]

In FIG. 1, a heat exchange vessel 1, a steam supply port 2 for supplying steam to be condensed, an overflow pipe 3 for discharging a drain condensed with steam, and an overflow pipe 3 are moved vertically. A heat exchanger is constituted by the fixing part 7 to be fixed, the atmosphere opening pipe 4 provided in the center of the heat exchange vessel 1 as an atmosphere opening part, and the check valve 20 provided in the atmosphere opening pipe 4.

In the heat exchange vessel 1, on the outer periphery of the open-to-atmosphere pipe 4,
The heat exchange pipe 5 in which a copper pipe is formed in a coil shape is arranged, and the inlet end 13 of the heat exchange pipe 5 is connected to the cooling fluid supply pipe 6.
And the upper end 14 of the heat exchange pipe 5 is connected to the hot water discharge pipe 8.

The overflow pipe 3 is a vertical straight line, and has an upper end 11 opened into the open-to-atmosphere pipe 4 and a lower end 12 connected to the flexible conduit 1.
7 is connected to a drain discharge section as condensed water (not shown). A fixing part 7 for adjusting the position of the overflow pipe 3 is provided below the heat exchange vessel 1. The fixing part 7 is composed of a male screw part 15 formed integrally with the heat exchange container 1 and a nut 16 paired with the male screw part 15. Nut 16
And the mounting position of the overflow pipe 3 can be adjusted in the vertical direction. In the present embodiment, the overflow pipe 3 and the fixing part 7 constitute a head height adjusting means.

Above the overflow pipe 3, an open air pipe 4
The check valve 20 is arranged inside. The check valve 20 includes a valve casing 23 having an inlet 21 and an outlet 22 and a valve casing 2.
3 is constituted by a hollow spherical float 24 which is vertically movable. The hollow spherical float 24 has a specific gravity smaller than the specific gravity of the drain in which the vapor is condensed. The valve seats 25,
26 is formed. In this embodiment, the valve casing 2
3 shows an example in which the valve seats 25 and 26 are integrally formed.
For example, the valve seats 25 and 26 can be made of synthetic rubber, synthetic resin, or the like, and attached to the inside of the valve casing 23.

[0013] A steam supply port 2 provided in the upper part of the heat exchange vessel 1
Is connected to the outlet side of a steam-using device (not shown) such as a blower or a shrink tunnel or a re-evaporation tank via a valve 9 to supply steam to the heat exchange vessel 1 for condensation.

Atmospheric open pipe 4 provided at the center of heat exchange vessel 1
The lower end 10 is opened below the heat exchange vessel 1, and the overflow pipe 3 is attached to the center of the atmosphere opening pipe 4. The steam supplied from the steam supply port 2 into the heat exchange container 1 pushes out the residual air in the heat exchange container 1 to the outside through the open-to-atmosphere pipe 4 and the check valve 20 to eliminate the same. In this case, check valve 2
The zero float 24 can remove initial air by moving away from the valve seat 25 by the flow of air and partial steam.

After the initial air is removed, the supplied steam is cooled by the heat exchange pipe 5 and condensed to form a drain, which accumulates in the lower part of the heat exchange vessel 1. The accumulated drain rises in the open-to-atmosphere pipe 4 due to the pressure of the supplied steam, and is discharged from the upper end 11 of the overflow pipe 3 to the outside.

When the amount of steam supplied from the steam supply port 2 decreases or disappears, the residual steam in the heat exchange vessel 1 is cooled and condensed, so that the pressure in the heat exchange vessel 1 decreases. While the liquid level in the open-to-atmosphere pipe 4 is lowered and air is tried to be sucked from the check valve 20, the hollow float 24 is seated on the valve seat 25, so that the air is released from the to-be-opened pipe 4 to the inside of the heat exchange vessel 1. Prevents air from entering the system.

As shown in FIG. 1, the head height from the lower end 10 of the open-to-atmosphere pipe 4 to the upper end 11 of the overflow pipe 3 is the head height. The head height can be arbitrarily increased by loosening the nut 16 and raising the overflow pipe 3, and the head height can be arbitrarily lowered by lowering the overflow pipe 3. .

When a large amount of non-condensable gas, such as air, is contained in the steam supplied from the steam supply port 2 to the heat exchange vessel 1, the non-condensable gas does not condense even when cooled, but the steam is not condensed. Cooled by the heat exchange pipe 5 and condensed to form water droplets, which are dropped to the lower part of the heat exchange container 1 to generate a predetermined head height.

When non-condensable gas is accumulated in the heat exchange vessel 1, the upper end 11 of the overflow pipe 3 is moved away from the lower end 10 of the atmosphere opening pipe 4 by loosening the nut 16 to lower the head height. By further lowering, the non-condensable gas can be discharged from the check valve 20 of the atmosphere opening pipe 4 or the overflow pipe 3 to the outside.

In this embodiment, the overflow pipe 3
Was moved up and down to adjust the water head height, but the open air pipe 4 could be moved up and down, or both the overflow pipe 3 and the open air pipe 4 could be moved up and down,
The head height can also be adjusted.

[0021]

According to the present invention, the inflow of non-condensable gas into the heat exchange vessel can be reliably prevented by the check valve of the float even when a reverse pressure exceeding the pressure at the head level is applied. Also, even when the supplied steam contains non-condensable gas such as air, the head is adjusted together with the steam by appropriately adjusting the head height by the head height adjusting means and releasing the liquid seal. The non-condensable gas can be discharged to the outside, and a decrease in heat transfer efficiency due to steam can be prevented.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional configuration diagram showing an embodiment of a heat exchanger of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchange container 2 Steam supply port 3 Overflow pipe 4 Open air pipe 5 Heat exchange pipe 6 Cooling fluid supply pipe 7 Fixing part 8 Hot water discharge pipe 16 Nut 20 Check valve 24 Float 25, 26 Valve seat

Claims (1)

[Claims] A heat exchange container is provided with an open-to-atmosphere portion, and a liquid having a predetermined head height is stored in the open-to-atmosphere portion and a lower portion of the heat-exchange container, so that non-condensation of air or the like into the heat-exchange container is achieved. A head height adjusting means capable of arbitrarily adjusting a head height of an open part to an atmosphere and a lower part of a heat exchange container in a device for preventing inflow of gas and condensing steam by heat exchange with a cooling fluid. A heat exchanger, comprising: a float that can move up and down in an atmosphere opening portion; and a check valve having a valve seat attached to the float to face the float.