JPS6124837Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drain recovery device for steam heating equipment.

Conventionally, in steam heating equipment, steam after heat exchange is converted into drain, and this drain is discharged to the outside via a trap. For this reason, the discharged condensate is discarded with a certain amount of heat (80° to 90°C), which is not only uneconomical, but also difficult to separate in the drainage system, which increases the load on wastewater treatment plants. It is the cause of

On the other hand, since it is a heating equipment, there is a large amount of evaporation loss of the solution, water, or aqueous solution to be heated in the tank, and if it is used as a cleaning equipment, cleaning items may be taken out. Since the amount of solution decreases, water is usually replenished to compensate for this.

Another method of effectively using steam is to blow steam directly into the solution without using a heat exchanger, but this method allows you to control the liquid level, and if an overflow occurs, use alkali or acid in the solution. When this happened, it became a big problem in terms of pollution.

The present invention is a drain recovery device for a steam heating device that uses the steam drain after heat exchange to replenish the solution in the heating tank, and also to effectively recover the heat contained in the steam drain. It provides:

The device of the present invention includes a tank containing water or an aqueous solution to be heated, a heat exchanger disposed in the tank and connected to a steam pipe, and one end connected to the heat exchanger. A drain pipe having a discharge port at the other end and a part of which is piped higher than the predetermined liquid level in the tank, and one end of which is connected to the part of the drain pipe which is piped higher than the predetermined liquid level, and the other end and a recycle pipe opening into the tank and having a U-shaped pipe part in the middle.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.

Fig. 1 is a side cross-sectional view of one embodiment of the present invention. In the figure, 1 is a tank containing a solution a, and like conventional steam heating equipment, a heat exchanger 2 is provided in the tank 1. One end of the heat exchanger 2 is connected to a steam pipe 3 and the other end is connected to a trap 4.
It is connected to a drain pipe 5 equipped with
Reference numeral 5' denotes a bypass of the drain pipe 5 equipped with an on-off valve. A temperature sensor 6 is provided on the side wall of the tank 1 and is electrically connected to a temperature control valve 7 provided on the steam pipe 3 so that the amount of steam supplied can be controlled. Reference numeral 8 denotes a supply pipe for the solution a.

In addition to this heating equipment, in the present invention, a part of the drain pipe 5 is piped so that it is higher than a predetermined liquid level in the tank 1, and the other end of the drain pipe 5 that is piped high is connected to the tank 1. An open recycling pipe 9 is provided. Moreover, in the middle of this cycle pipe 9,
A U-shaped tube portion is formed.

Next, let's talk about the function of this heating equipment.
First, when the temperature of the solution a falls below a predetermined temperature, the temperature control valve 7 opens based on the feedback from the measured temperature 6, and steam is supplied into the heat exchanger 2. In this heat exchanger 2, the steam releases heat, condenses, and drains b.
The drain b is normally discharged from the drain port 10 through the drain pipe 5 to the outside of the system.

In the present invention, since a recycling pipe 9 is provided, a part of the drain b is supplied into the tank 1. This supply mechanism will be explained in an easy-to-understand manner with reference to FIGS. 2 and 3. In this case, drain b
is stored in pot 9', and only the excess is discharged to outlet 1.
Ejected from 0.

FIG. 2 is a diagram showing the state when the tank 1 is sufficiently filled with solution a and the liquid level is approximately at a predetermined position. The difference (H) between the height of the solution a side and the difference H' between the height of the drain b side on the drain piping 5 side of the U-shaped pipe part and the height of the drain b side on the tank 1 side of the U-shaped pipe part is equal to We are doing so. That is, since the air existing in the recycle pipe 9 receives equal pressure from the solution a and the drain b and does not move, the drain b also does not flow into the tank 1.

On the other hand, FIG. 3 is a diagram showing the state when the solution a in the tank 1 decreases and the liquid level drops, and H<
H', a pressure difference is generated, drain b flows into solution a, and the pressure returns to a predetermined liquid level (dotted line) where it becomes equilibrium.

As shown in the figure, the diameter of both ends of the recycle pipe 9 is increased to form pots 9' in order to prevent the air inside the pipe 9 from escaping, and also to prevent the solution a and the drain b from escaping.
This is to allow large fluctuations in the liquid level within the tube 9.

As a result, with this invention, water is automatically supplied through the drain piping as described above, which eliminates the need for maintenance such as liquid level control, and eliminates the need for maintenance such as liquid level control. Overflow etc. can be prevented.

As described above, according to the device of the present invention, the solution is replenished not with industrial water but with a heated drain, so there is no need for replenishment water, and the steam used for heating can be removed. The amount can be reduced by about 10%. In addition, it has many advantages such as being able to significantly reduce the amount of water used in the current situation where total water pollution regulations are being applied.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention;
2 and 3 are side sectional views showing the mechanism of the recycling pipe of the above embodiment. In the figure, 1...tank, 2...heat exchanger, 3...steam pipe, 5...drain pipe, 9...recycle pipe, 10...discharge port, a...solution (water, aqueous solution), b ...Drain.

Claims (1)

[Scope of utility model registration request] A tank containing water or an aqueous solution to be heated, a heat exchanger disposed in the tank and connected to a steam pipe, and one end connected to the heat exchanger and an outlet at the other end. a drain pipe with a part of the drain pipe installed above a predetermined liquid level in the tank, and one end connected to a part of the drain pipe connected above the predetermined liquid level and the other end opened into the tank. A drain recovery device for a steam heating facility, comprising a recycling pipe having a U-shaped pipe section in the middle.