JPS6351756B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water generating apparatus for producing fresh water from seawater, and particularly to the structure of a mist separator thereof.

First, the structure of a marine water generator proposed by the inventors in which a brine discharge pipe is provided in the center of the heating chamber for regulating the water level in the heating chamber will be explained with reference to the drawings.

FIG. 1 is a sectional view of the device, and inside the main body 1a of the freshwater generating device 1 there is a group of heat transfer tubes 2a for a heater 2 and a condenser 3.
and 3a. A fresh water tray 4 is provided to partition both tube groups. Seawater is pumped up by a seawater pump 5, enters a condenser 3 through a pipe 6, and is discharged through a pipe ₆₁ . A valve 7 is provided in the pipe line connecting the pipe lines 6 and ₆₁ in a bridge manner. This valve 7 is closed while the freshwater generator is in operation, but when the freshwater generator is in operation, the valves 7a and 7b provided in the pipes 6 and ₆₁ are closed and the valve 7 is opened, allowing the seawater to flow directly into the sea. Used for disposal. The cooling seawater, which has absorbed heat in the condenser 3 and has been heated, passes through a pipe line 6 ₂ branching from the pipe line 6 ₁ and is supplied to the brine heating chamber 8 via a valve 18 . Concentrated supply seawater (brine) overflows a brine discharge pipe 17 located at the center of the water generator and controls the water level, and is discharged from a valve 9 via a discharge pipe 10.

The heating fluid supplied to the heater 2, such as steam or diesel engine exhaust gas, passes through the pipe 11, and then passes through the heat exchanger tube group 2a of the heater to the pipe 11.
₁ to another device (not shown). A valve 12 is installed in the pipe line connecting the pipe lines 11 and ₁₁₁ with a bridge.
In addition, valves 12a and 12b are provided in the pipes ₁₁ and 111, and are used when the fresh water generator is out of operation. The seawater heated by the heat transfer tube group 2a of the heater 2 evaporates rapidly because the pressure in the main body 1a is reduced to approximately -700 mmHg, and the water vapor and non-condensable gas pass through the mist separator 22 as shown in Figure 2. The water vapor contacts the heat transfer tube group 3a of the condenser 3 and exchanges heat, and the water vapor condenses to become fresh water and accumulates in the fresh water tray 4, and the fresh water pump 1
3 via pipe 14a to a freshwater tank (not shown)
is sent to via conduit 14. The non-condensable gas is extracted from the nozzle 15 or 15a.

Since seawater contains scale components such as Ca and Mg, in order to prevent these from adhering to the surface of the heating tube, a phosphoric acid-based scale inhibitor (for example, trade name: Kryfloat M203, etc.) is applied from the chemical tank 18 to the pump 19. The seawater is supplied to the heating chamber 8 via a pipe line 21 together with seawater from a pipe line 20 including a valve 20a and an orifice 20b. This chemical solution makes the scale attached to the tube surface porous, making it easier to peel off from the tube.

The mist separator 22 removes brine water droplets accompanying the steam, and if the removal of the brine water droplets is insufficient, the purity of the condensed fresh water in the fresh water tray 4 will decrease.

As the mist separator, synthetic resin wires (approximately 1 mm in thickness) are intertwined into a mat shape like a "tsutakazura" for ease of handling and low pressure drop. This is selected from the viewpoints of corrosion resistance against seawater, ease of handling, price, etc. However, as shown in Figure 2, if the mat is left as a simple mat (plate-like), that is, fixed at both ends, brine water droplets, salt, etc. will accumulate inside the mat during operation, and the middle part will sag as shown in the diagram (indicated by the broken line). This is a problem because brine and precipitates accumulate at the bottom, increasing the resistance to steam ventilation.

For this reason, the inventors previously proposed a mist separator as shown in FIG. This mist separator is made of bent synthetic resin wires with a diameter of about 1 mm that are intertwined like a ``tsutakazura'' to form a plate-like mat with a thickness of about 60 mm. One end of this mat 23 is connected to the vertical side wall 4 of the condenser as shown in FIG.
a with bolts 23b so as to hold it down with seat plate 23a. Bolt holes in mats can be easily drilled by applying a red-hot iron rod with the same diameter as the bolt.

The other end is attached to the side wall of the apparatus main body 1a with a bolt 23b to a mounting bracket 23c. In this case, if the mounting point A on the condenser chamber side is selected to be higher than the mounting point B on the main body side, the mat 23 will form an S-shape in cross section with the convex curved surface facing upward as shown in the figure. In this way, even if water droplets and scale accumulate on the pine, they will not drip down. The line connecting points A and B should preferably be at an angle of about 30° to the horizontal.

It is an object of the present invention to propose a device that increases the effect of separating water droplets in such a mist separator.

In short, this invention is a freshwater generator in which a mist separator is provided in the path through which steam flows from the heating chamber to the condensing chamber, and a wire net with strong corrosion resistance against seawater is placed below the mist separator, with an electrolytic anti-corrosion anode material interposed in the attachment part. The present invention is also characterized in that it has a mist separator with a net, in which the attachment part of the apparatus main body is lower than the attachment part of the side wall of the condensing chamber and is installed in an oblique manner.

This invention will be explained below with reference to the drawings.

As shown in FIG. 4, one embodiment of the present invention has a space 24 with the mist separator 23, and a net 25 made of wire having strong corrosion resistance against seawater is placed below the mist separator 23. One end is diagonally attached to the mounting bracket 26 on the side wall of the water generator body, and the other end is attached to the bolt 2 on the side wall 4a of the condensing chamber.
Install it in step 7. The mounting bracket 26 is provided at a position lower than the bolt 27.

By providing such a net 25, the resistance to steam flow is small, and the mist can be removed primarily from the steam containing water droplets of various diameters generated from boiling seawater by the group of heating heat transfer tubes. This reduces the chance of deposits of contained impurities and contributes to continuous operation of the equipment. The captured mist flows down as brine through the net, and flows down from the metal fitting 26 along the side wall 1a of the main body into the evaporation chamber. In this case, the cathodic protection anode material 2 is attached to the metal fitting 26.
8 can prevent corrosion of the main body.

As another example, as shown in FIG. 5, a mist separator 23 is provided on a cage-shaped mounting member 29 that connects the main body side wall 1a and the evaporation chamber side wall, in which a plurality of elongated plates are arranged at intervals, A net 25 made of wire is positioned below it to enhance the mist removal effect.

By carrying out this invention, the mist separation is performed in two stages by the net and the mist separator 23, thereby increasing the effect of mist separation and the effect of washing away salt from the net, which greatly contributes to continuous operation of the apparatus.

[Brief explanation of drawings]

Figure 1 is an explanatory cross-sectional view showing the structure and piping of a marine fresh water generator, Figure 2 is a cross-sectional view showing a mist separator, and Figure 3 has an S-shaped cross-section as previously proposed by the inventors. A cross-sectional view showing a mist separator,
FIG. 4 is a sectional view showing a first embodiment of the present invention, and FIG. 5 is a sectional view of a second embodiment having a mist separator of another type. DESCRIPTION OF SYMBOLS 1... Water generator, 1a... Device main body side wall, 4a... Condensation chamber side wall, 23, 23'... Mist separator, 2
4...Space, 25, 25'...Net formed by wire.

Claims (1)

[Scope of Claims] 1. In a fresh water generator in which a mat-shaped mist separator is provided in the passageway where steam flows to the condensing chamber, which is placed above the heating chamber, a wire net with strong corrosion resistance against seawater is installed below the mist separator. 1. A freshwater generator having a mist separator with a net, characterized in that the mounting part is installed extending diagonally lower than the condensing chamber side wall mounting part. 2. A mat made of wire with strong corrosion resistance against seawater is placed on a cage-like mounting member that connects the main wall of the freshwater generator and the side wall of the condensation chamber to serve as a mist separator, and a wire net is placed diagonally below the mist separator. A freshwater generator having a mist separator with a net according to claim 1.