JPH0251083B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a steam generator used in a device that transfers heat using steam.

BACKGROUND TECHNOLOGY As shown in FIG. 3, a device that transfers heat using steam pressure includes a steam generator 13 with a closed chamber structure into which a working fluid is injected, and a heat radiating section that condenses the working fluid. The side sealed chamber 14 is connected with a single transfer pipe 9, and the opening at one end of the transfer pipe 9 is positioned above the working fluid in the steam generator 13, while
The opening at the other end of the transfer pipe 9 is provided near the bottom wall of the heat radiation side sealed chamber 14 so as to be located below the inside of the working fluid condensed in this sealed chamber, and at least a portion of the transfer pipe 9 is provided. There is a device that is arranged above the top wall of the heat radiation side sealed chamber 14, and is configured to reflux the condensed working fluid in a liquid state without heat transfer based on the temperature reversal of both sealed chambers ( For example, Jitsukō 57-16067).

Problems to be Solved by the Invention In such conventional technology, the steam generator 1
The bottom or surrounding area of the steam generator 13 is heated by a heat source such as a burner to generate steam, but when the level of the working fluid in the steam generator drops with evaporation, the level of the working fluid in the steam generator 13 drops. The area of contact will also gradually become smaller. In other words, since the heat transfer area is reduced, the evaporation efficiency is also reduced. Furthermore, since the inner surface of the steam generator 13 that is not in contact with the surface of the working fluid is overheated, scale adheres to the surface, further reducing the evaporation efficiency.

Means for Solving the Problems In order to solve these problems, the present invention has the following features:
The air bubble collecting plate includes a sealed container, a steam outlet provided at the top of the sealed container, a bubble collecting plate located inside the container, surrounding the bottom and having an opening, and a bubble rising pipe connected to the air bubble collecting plate. The steam generator is designed to guide the air bubbles generated between the container and the bottom of the container to the top of the container along with the liquid.

Effect With the above configuration, when the bottom of the closed container is heated with a burner, the working fluid in this closed container starts to evaporate. Then, the bubbles generated at the bottom are collected by the bubble collecting plate in an opening provided in this plate, rise together with the liquid as a two-phase flow in a bubble rising pipe connected to this opening, and collide with the upper part of the closed container. This flow is separated into liquid and steam, and the steam is sent out from the steam outlet. On the other hand, the liquid collides with the upper part of the sealed container, scatters, wets the inner wall surface of the sealed container, and returns to the working fluid in the lower part of the sealed container.

Embodiment The following is a first explanation of the configuration of an embodiment of the present invention.
This will be explained using FIG.

Fig. 1 shows a heat transfer device using the steam generator of the present invention. In the figure, 1 is a closed container with a rectangular cross section, and inside the container, a bubble concentration plate 2 is provided with a V-shaped cross section. Together with the bottom of the container, it forms a house-shaped cross section. The bubble collecting plate 2 is provided with an opening 3 for taking out the bubbles and a communication port 4 having a smaller area than the opening 3, and a bubble rising pipe 5 is connected to the opening 3. FIG. 2 shows the bubble collecting plate 2 and the bubble riser 5 taken out from the closed chamber 1. Further, a steam outlet 6 is provided in the upper part of the airtight container in a protruding manner, and a level sensor 7 is provided on the air bubble collecting plate. The above parts constitute a steam generator. The steam generator is placed in the combustion gas of a burner 8 provided below as a heating source,
Water is sealed inside as a working fluid.

On the other hand, the heat radiator 1 is connected to the steam generator and the heat transfer pipe 9.
0 is connected, and inside this radiator 10, a heat exchanger tube 9 and a closed container 10 are connected in this order.

In the above configuration, when the steam generator is heated by the burner 8, the water serving as the working fluid begins to boil and steam bubbles are generated from the bottom of the steam generator. The vapor bubbles are collected in the opening 3 by the bubble collecting plate 2 and rise in the bubble riser tube 5 together with liquid water (hereinafter simply referred to as liquid) as a so-called two-phase flow. This flow collides with the top surface of the closed container 1, and the steam is released from the steam outlet 6.
Then, the liquid falls into the lower liquid part along the wall surface of the closed container 1.

Now, the steam is conveyed from the steam outlet 6 to the radiator 10 via the conveying pipe 9, and is condensed by heat transfer in the heat transfer tube 11 to become a liquid and accumulated in the closed container 12. When the vapor is transported in this way and the liquid level in the closed container 1 is lowered, the level sensor 7 detects this and stops combustion in the burner 8. Then steam generator 1
is cooled and its pressure decreases, and when it becomes lower than the pressure in the closed container 11, the liquid in this container returns to the closed container 1 via the conveying pipe 9. When all the liquid has returned to the closed container 1, the burner 8 is ignited again to start heating and the above operation is repeated.

According to the above embodiment, even if the liquid level in the closed container 1 decreases due to evaporation, the bubble concentration plate 2 and the bubble riser 5
This creates a so-called bubble pump effect in which vapor and liquid are mixed and raised, and the inner surface of the sealed container 1 is always kept in contact with the liquid, so the evaporation efficiency can be maintained almost constant regardless of the liquid level height. , the integrated value can be made higher than before. Furthermore, since the inner surface of the closed container 1 is not overheated, scale does not adhere to it, and a decrease in evaporation efficiency can be prevented.

Effects of the Invention As described above, the steam generator of the present invention has the following effects.

Even if the liquid level inside the steam generator drops due to evaporation, the bubble collecting plate and bubble riser provide a bubble pump effect, and the inner surface of the sealed container is always kept in contact with the liquid. Therefore, the evaporation efficiency can be maintained almost constant, and the integrated value can be made higher than before. Furthermore, since the inner surface of the closed container is not overheated, scale does not adhere to it, and a decrease in evaporation efficiency can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional view of a heat transfer device using a steam generator according to an embodiment of the present invention, and Fig. 2 is a single cell aggregation plate used in the steam generator in the heat transfer device of Fig. 1. FIG. 3 is a schematic cross-sectional view of a heat transfer device using a conventional steam generator. 1... airtight container, 2... bubble collection plate, 5... bubble riser, 6... steam outlet, 7... burner.

Claims (1)

[Claims] 1. A closed container filled with a working fluid, a steam outlet provided at the top of the closed container, a bubble aggregation plate located in the closed container and covering the bottom of the closed container and having an opening, and the air bubble aggregation plate. A steam generator comprising: a bubble riser pipe connected to the opening of the plate and guiding bubbles generated between the bubble collecting plate and the bottom of the sealed container to the upper part of the sealed container.