JP3282006B2 - Steam heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for heating an object to be heated in a heat exchanger with steam.
The present invention relates to a steam heating device suitable for a relatively low temperature of about C. Specifically, it is used for steam heating of various reaction vessels used for a polymerization reaction or the like, a distilling apparatus, a concentrating apparatus, or a sterilizing apparatus for food. The heated object in these cases is
In many cases, a slight temperature rise causes thermal damage, and it is necessary to accurately maintain the heating temperature.

[0002]

2. Description of the Related Art A conventional steam heating apparatus, for example, as shown in FIG. 2 has been used. This is for heating the heat exchanger 1, connecting a steam supply pipe 2 for heating to the heat exchanger 1, and using a falling part 3 for discharging condensate generated by heating and a steam trap 4. The condensate discharge device 5 is configured to supply a relatively low-pressure, that is, low-temperature steam from the steam supply pipe 2 to the heat exchanger 1, thereby heating an object to be heated in the heat exchanger 1. is there. The steam supplied into the heat exchanger 1 is condensed by heating, and the inside of the heat exchanger 1 is maintained at a low pressure of about atmospheric pressure or less.
Steam heating can be performed at a relatively low temperature of 0 ° C. or 100 ° C. or less.

[0003]

In the above-mentioned conventional steam heating apparatus, non-condensable gas such as air mixed in the heating steam cannot be removed from the heat exchanger, so that unevenness in the heating temperature is reduced. There was a problem that the heating temperature could not be accurately maintained.

The steam for heating contains some air, but in the above-mentioned conventional steam heating device, the condensate discharge device 5 is connected to the falling part 3 and the steam trap 4.
The condensed water is discharged through the steam trap 4 due to the head pressure accumulated in the falling section 3, but non-condensable gas such as air is accumulated in the falling section 3. It is not eliminated outside the vessel.

Accordingly, a technical object of the present invention is to eliminate non-condensable gas such as air mixed in a heat exchanger,
An object of the present invention is to provide a steam heating device capable of accurately maintaining a heating temperature.

[0006]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is to form a heating section in a heat exchanger and connect a steam supply pipe for heating,
In the case of connecting the condensate discharge device that discharges the condensate generated by heating, connect the condensate reservoir to the condensate discharge device,
A receiver is connected to the condensate reservoir via a falling portion having a desired length, and the receiver and the condensate reservoir are communicated via a circulating pump. It is equipped with an atmosphere opening valve that can be opened and closed.

[0007]

The operation of the above technical means is as follows.
The heating steam supplied to the heat exchanger is condensed by heating the object to be heated and becomes condensed water to reach the condensate reservoir. Non-condensable gas such as air flowing down to the condensate reservoir is condensed by forcibly circulating the condensate collected in the condensate reservoir, falling portion, and receiver to the condensate reservoir again by the circulation pump. Mixed into the circulating flow of water to reach the receiver.

When the amount of generated gas is small, the non-condensable gas in the receiver is stored in the receiver, and after the heating process is completed, the non-condensable gas is manually removed to the outside, or the non-condensable gas is removed. An air vent or the like that detects the presence by a float or the like and automatically discharges only the non-condensable gas from the valve port can be removed to the outside by attaching the receiver to a receiver.

Since the air release valve is attached to the falling portion, the head of the falling portion below the air release valve can be eliminated by opening the air opening valve, and the water head of the falling portion can be eliminated. The height can be changed, so that the degree of vacuum in the condensate reservoir and thus in the heat exchanger can be arbitrarily adjusted, and the temperature of the heating steam can be changed according to the object to be heated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described with reference to FIG. In this embodiment, the same members as those of the prior art are denoted by the same reference numerals. A steam supply pipe 2 is connected to a heat exchanger 1 as a steam heating device via a pressure regulating valve 6. A steam trap 4 as a condensate discharge device is attached to a lower portion of the heat exchanger 1. The condensate reservoir 7 is connected to the lower part of the steam trap 4. The condensate reservoir 7 has a falling section 8 having a cylindrical shape in cross section and a predetermined length attached to a side portion thereof. An on-off valve 9 is attached to the upper part of the falling part 8, and a lower end 10 of the falling part 8 is arranged to be opened in the receiver 11. The receiver 11 is also a cylindrical tank with an air vent 12 and an on-off valve 13 mounted on the upper part, a replenishing water pipe 14 for replenishing water is connected on the lower part, and a suction port 16 of a circulation pump 15 is connected. I do. The discharge port 17 of the circulation pump 15 is connected to the lower end of the condensate reservoir 7 via a pipe 18.

Atmospheric release valves 25, 26, 27 are attached to the falling portion 8 via conduits 22, 23, 24. As the atmosphere release valves 25, 26, and 27, general on-off valves can be used. In this embodiment, the air release valves 25 and 26 are closed, and only the air release valve 27 is open. The height of the falling portion 8 is the length above the pipeline 24. The degree of vacuum is slightly lower than when the atmosphere release valve 27 is in the closed state. In this embodiment, an example is shown in which three atmospheric release valves are attached at substantially equal intervals, but only one may be provided depending on the state of the object to be heated.

A conduit 20 and an on-off valve 2 are provided above the condensate reservoir 7.
Attach 1. When the on-off valve 21 is opened, the inside of the condensate reservoir 7 is in communication with the atmosphere, and when the valve is closed, the inside of the condensate reservoir 7 is in a state of being cut off from the atmosphere.

Each vacuum pressure is set so that the pressure in the condensate reservoir 7 is slightly lower than the pressure required in the heat exchanger 1. For example, if a pressure of 360 millimeters of mercury is required in the heat exchanger 1,
The internal pressure must be lower than that of the condensate to flow down, for example, set to 290 millimeters of mercury. It is desirable that the length of the falling portion 8 is generally about 10 meters.

Next, the operation will be described. If it is necessary to remove the residual air in the condensate reservoir 7 before heating in the heat exchanger 1, the on-off valve 21 is first opened and the circulating pump 15 is driven to drive the receiver. Condensate reservoir 7
After the residual air is removed from the on-off valve 21, the on-off valve 21 is closed and the water flows into the receiver 11 by its own weight, so that a predetermined vacuum pressure range is formed above the condensate reservoir 7. Is formed and then heated. If the removal of residual air is not necessary before heating, the above operation is not necessary.

The low-pressure heating steam supplied from the steam supply pipe 2 via the pressure regulating valve 6 is condensed by heating an unillustrated object to be heated in the heat exchanger 1 to become condensed water and form a steam trap. 4 flows down into the condensate reservoir 7. The condensate collected in the condensate reservoir 7 flows down the falling part 8 together with a part of the circulating fluid in the receiver 11 supplied from the circulation pump 15 and reaches the receiver 11. In this case, the non-condensable gas such as air mixed into the heating steam reaches the condensate reservoir 7 together with the condensed water, is caught by the circulating fluid, flows down the falling portion 8, and flows into the receiver 11. It accumulates at the upper part and is discharged outside through the air vent 12 or the on-off valve 13.

When the amount of condensed water in the receiver 11 reaches a predetermined value or more, the condensate is discharged from a discharge pipe (not shown) to the outside, or discharged from a branch pipe (not shown) branched from the discharge port 17 of the circulation pump 15. I do. If the temperature of the circulating fluid reaches a predetermined temperature or more and adversely affects the circulating pump 15, cooling water can be supplied from the makeup water pipe 14 to a desired temperature.

[0017]

As described above, according to the present invention, the condensate section, the falling section, the receiver and the circulation pump are sequentially connected to the heat exchanger to forcibly circulate the condensate in the condensate section. By doing so, non-condensable gas such as air can flow down to the receiver together with the condensate.Therefore, the non-condensable gas in the heat exchanger is eliminated by the circulating flow, and uneven heating in the heat exchanger. Does not occur.

Since the air release valve is attached, the degree of vacuum in the heat exchanger can be changed according to the object to be heated. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of a steam heating device of the present invention.

FIG. 2 is a configuration diagram showing a conventional example of a steam heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Steam supply pipe 4 Steam trap 7 Condensate sump 8 Falling part 11 Receiver 15 Circulation pump 25,26,27 Atmospheric release valve

Claims (1)

(57) [Claims] 1. A condensate discharge device for discharging a condensate generated by heating while connecting a steam supply pipe for heating and forming a heating section to the heat exchanger. The condensate section is connected, a receiver is connected to the condensate section via a falling section having a desired length, and the receiver and the condensate section are connected via a circulation pump. A steam heating device, characterized in that an air release valve that is open and closed is connected to the falling portion and is connected to the falling portion.