JPS594722Y2 - Liquid spraying device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid spraying device, and more particularly to a liquid spraying device suitable for spraying evaporated liquid onto a group of heat transfer tubes in a multiple effect evaporator.

In a conventional multi-effect evaporator, for example, a multi-effect evaporator for seawater desalination, above the heat transfer tube group of each effect can,
A liquid dispersion device is provided in which the evaporated liquid is retained, and the bottom plate is a perforated plate having a row of holes at a location directly above the base pipe of the tube group, and the evaporated liquid is sprayed from the liquid distribution device to each heat transfer tube group. This method is generally adopted.

In such a multi-effect evaporator, the holes in the perforated plate of the liquid spraying device are easily clogged due to minute dust contained in the evaporating liquid, which has a serious effect on the long-term continuous operation of the evaporator. This was a major factor in reducing the operating rate of the equipment.

In addition, sometimes the evaporated liquid flowing down from the perforated plate does not flow down onto each tube of the heat exchanger tube group installed below the perforated plate due to pressure fluctuations above the perforated plate or clogging with foreign matter, etc., and instead flows sideways or diagonally. As a result, the evaporated liquid flows down the heat exchanger tube group without exchanging heat, resulting in poor evaporation efficiency and the formation of scale on the heat exchanger tube surface where the evaporated liquid is not exposed, which often impedes long-term safe operation. It was done.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional technology in a multiple effect evaporator, prevent clogging of the perforated plate, ensure the flow of liquid onto the heat transfer tube surface, and improve the efficiency of the multiple effect evaporator. The object of the present invention is to provide a liquid spraying device that enables long-term continuous operation.

The liquid dispersion device according to the present invention is installed above a group of tubes to retain the liquid, and the bottom plate is a perforated plate having a row of holes located directly above the base pipe of the group of tubes. In the device for dispersing the perforated plate, a net structure is provided that covers each hole row of the perforated plate individually or completely, and the net structure passes through the base holes of the perforated plate and comes into contact with the base pipes of the group of tubes. A liquid dispersion device with multiple liquid guide lines hanging down or near the same, which prevents clogging, reliably guides the liquid to the pipe group, and facilitates long-term continuous operation of equipment using the liquid dispersion device. This makes it possible to improve efficiency.

Embodiments of the liquid spraying device of the present invention will be described below with reference to FIGS. 1 and 2.

Reference numeral 6 denotes a perforated plate of the bottom plate of the liquid distribution device provided above the group of heat transfer tubes 4.

The evaporated liquid 7 is retained on the perforated plate 6.

A row of holes 3 is provided in the perforated plate 6 at a location directly above the container tubes 4 of the heat exchanger tube group.

Each row of holes 3 is covered by a dome-shaped net structure 1, which is attached to a perforated plate 6 by holes 1 to 5.

A plurality of liquid guide lines 2 are suspended from the network structure 1, each passing approximately through the center of the pores 3 of the perforated plate 6 and coming into contact with or near the heat exchanger tubes 4.

The mesh structure 1 is made of metal or plastic.

The liquid guide line 2 is made of a wire product, a string product, a chain product, etc. made of metal, plastic, natural fiber, or mineral material.

Another embodiment of the net structure 1 is shown in FIG.

In this embodiment, the mesh structure v01 is not provided in each row of holes 3 of the perforated plate 6, but the mesh structure 1 in the form of a sub-figure is attached in parallel to the perforated plate 6 over the entire upper surface of the perforated plate 6. be.

Of course, the supply of the evaporated liquid 7 to this liquid spraying device is carried out by the network structure 1.
The evaporated liquid 7 is made to necessarily pass through the network structure 1 and reach the holes 3.

The liquid spraying device of the present invention is constructed as described above, and its operation will be explained next.

When the evaporated liquid 7 retained on the porous plate 6 passes through the net structure 1, fine dust is removed and flows downward through the holes 3.

At this time, the flow plate 8 is connected to the liquid guide line 2 provided in the net structure 1.
Since it flows down along the heat exchanger tube 4 without scattering sideways or diagonally, it is reliably guided to the heat exchanger tube 4 and heat exchanged on the surface of the heat exchanger tube.

Above, an embodiment has been described in which the liquid dispersing device of the present invention is installed in a multiple effect evaporator, but the liquid dispersing device of the present invention is not limited to use in a multiple effect evaporator, and is not limited to use in a multiple effect evaporator. Spray the liquid on the group, heat evaporate or cool the liquid,
It goes without saying that it can also be used as a liquid spraying device for general heat exchange means for cooling or heating fluid in a group of tubes.

Since the liquid spraying device of the present invention is constructed and operates as described above, the net structure prevents the clogging of the holes in the multi-plates due to foreign matter in the liquid, reducing the number of times the operation must be stopped for cleaning the perforated plates. It is possible to improve the operating rate of the equipment used.

Furthermore, since the liquid guide line reliably guides the liquid to each tube of the tube group, the heat exchange rate can be improved and scale adhesion can be prevented.

The liquid spraying device of the present invention can be effectively used in a multi-effect evaporation device for seawater desalination and the like.

[Brief explanation of drawings]

The drawings all show an embodiment of the liquid dispersion device of the present invention, and FIG. 1 is a perspective view of a cutaway part, FIG. 2 is a side view taken in the direction of arrow A in FIG. 1, and FIG. FIG. 3 is a side view corresponding to FIG. 2; 1... Network structure, 2... Liquid guide line, 3.
...hole, 4 ... heat exchanger tube, 5 ...
Bolt, 6... Porous plate, 7... Evaporated liquid, 8... Falling liquid.

Claims (2)

[Scope of utility model registration request] (1) In a device for distributing liquid to a group of tubes, the bottom plate of which is a perforated plate having a row of holes located directly above the base pipe of the group of tubes, the bottom plate of which is installed above a group of tubes to retain liquid; , a net structure is provided that covers each hole row of the perforated plate individually or entirely, and from the net structure each passes through the base hole of the perforated plate and reaches the base pipe of the tube group or the vicinity thereof. A liquid dispersion device characterized in that a plurality of liquid guide lines are suspended. (2) A liquid spraying device as claimed in claim 1, which is provided in a multi-effect evaporator to spray evaporated liquid onto a group of heat transfer tubes of the multi-effect evaporator.