JPS6038081A - Flash evaporation type water distilling apparatus - Google Patents

Abstract

PURPOSE:To prevent the adhesion of splash to a demister, by arranging a large number of folded plates to the lower part of the demister, which is provided to a steam flowline communicated with a flash chamber and a condenser chamber, in parallel so as to provide intervals therebetween. CONSTITUTION:High temp. brine, which is reduced in pressure upon the passage through an orifice 1 and flowed into a flash chamber 3, is subjected to flash evaporation. Splash generated at this time is violent toward high temp. stages and liquid droplets each having a large particle size of about 500-1,000mum reach the attachment position of a demister 4. In this case, the flying splash is once impinged to folded plates 8 and condensed on the wall surfaces of the folded plates 8 to be formed into liquid droplets with a larger particle size while these large diameter liquid droplets are naturally fallen to the surface of the evaporated liquid received in the lower part of the flash chamber 3 against the steam stream rising from the lower part thereof. As a result, the greater part of the splash can be separated from the steam passing through the demister and the quality of prepared water can be enhanced to a large extent.

Description

[Detailed description of the invention] The present invention relates to a flash evaporation type water generator.

In particular, the present invention relates to improvements in techniques for preventing splatter and v-soil in the apparatus.

FIG. 1 shows a partial plan view of a conventional multi-stage flash evaporation type fresh water generator.

In Figure 1, 1 is an orifice and 2 is a weir.

3 is a flash chamber, 4 is a wire mesh type demister,
5 is a condenser chamber, q is a tray, 7 is a male splash prevention plate, 9 is a partition, 10 is a bottom plate, 11 is a heat exchanger tube, and 12 is an orifice adjustment plate. As a result, the brine introduced from the orifice 1 is ejected and flash-evaporated in the flash chamber 3, and the evaporated flash vapor (arrow) passes through the demister 4 and is condensed in the condenser chamber 5 to become fresh water in the tray 6. is collected and taken out to the outside.

However, in the above-mentioned conventional multi-stage flash evaporation type water supply system, the splash (dispersed mist) generated when the brine is ejected from the orifice 1 is entrained in the flash steam flow, reaches the demister 4, and adheres to the demister 4. This has drawbacks such as lowering the efficiency of steam flow through the demister 4, and further causing the steam to flow into the condenser chamber 5, leading to a deterioration in the quality of the produced fresh water.

Therefore, conventionally, the crotch throttle orifice 1 of the flash chamber 3
In order to solve these problems, a splash prevention plate 7 was provided between the demister 4 and the demister 4 to block the splash. However, with the conventional splash prevention plate 7.

Part of the collided mist may be re-splattered and carried along with the steam flow, reaching the demister 4, so that the splash cannot be blocked sufficiently, and the problems of the conventional device still remain.

In order to solve the above-mentioned problems of the conventional device, the present invention captures the splash that collides with the splash prevention plate and is then re-splattered, and accelerates its fall due to gravity, so that the splash adheres to the demister and flows into the condenser chamber. This is a proposal to prevent the contamination of

The present invention will be explained below with reference to FIGS. 2 to 5.

In FIGS. 2 to 4, reference numeral 8 indicates a folded plate according to an embodiment of the present invention, and the folded plates 8 are arranged in parallel at a distance from each other below the demister 4.

Note that in FIG. 2, the same symbols as in FIG. Flash evaporates. The splash that occurred at this time was very violent on the high temperature stage, and the splash was approximately 500 to 1000.
The droplets with a large particle diameter of μm reach the demister 4 pick-up position. If the amount of this splash is large, the splash (liquid M) once captured by the demister 4 will not be sufficiently dripped and collected and will be carried into the condenser chamber 5 again along with the steam, resulting in a decrease in the purity of the produced water. There will be no.

However, in the case of the structure of the present invention, the flying splash once collides with the folded plate 8, aggregates on the wall surface of the folded plate 8, becomes larger droplets, overcomes the vapor flow rising from below, and flashes. It naturally falls to the evaporated liquid level in the lower part of chamber 3.

As shown in Fig. 2, most of the splash occurs between the orifice 1 and the weir 2, and the splash that forms an angle α between the horizontal plane and the scattering direction of approximately 20 to 90 degrees generally reaches the demister 4. .

Therefore, if the folded plates 8 are simply flat plates, splashes will occur that pass between the flat plates. Therefore, the angle β of the folded plate is 90
degree or less is preferable.

Moreover, when the interval between adjacent folded plates 8 is wide.

Splash 75 (generates) that scatters across the intervals between the folded plates 8. Therefore, the distance d between the lower end of the folded plates 8 and the convex portion of the folded plates 8
(See Figure 4) The larger the value, the better.

If it is too large, the number of folded plates 8 will increase, resulting in an increase in cost, and will also cause problems such as increasing the pressure loss of steam passing between the folded plates 8.

Using an apparatus of the structure of FIGS. 1 and 2.

The results of confirming the effects of the present invention are shown in FIG.

(1) Implementation conditions (al Brine temperature 55℃ (bl Steam temperature 52.2℃ Ic) Pressure 0.14 kg/C#LA+dl Gas flow rate passing through demister 9.4 m/5 (2) Results Steam after passing through demister It was clear that the weight-average mist particle size was decreasing, confirming the effects of the present invention.

As described above in the embodiments, in a flash evaporation type fresh water generating apparatus having a demister, a large number of folded plates are arranged below the demister.

Most of the splash generated by flash evaporation can be separated and removed from the vapor passing through the demister, significantly improving the quality of produced water.

Further, the effects of the present invention are particularly large when the shape of the condenser chamber is round.

[Brief explanation of the drawing]

Fig. 1 is a partial plan view of a conventional water supply device having a round-shaped condenser chamber, Fig. 2 is a sectional view illustrating the present invention, Fig. 3 is a perspective view of a folded plate, and Fig. 4 is a folded plate. FIG. 5, a front view of the plate, is a graph of splash particle size based on run number of runs using conventional and inventive apparatus. 3. Flash chamber, 9. Partition wall, 2: Weir, 10: Bottom plate, 4
．． Demister, 1 niorifice, 8: folded plate. Figure 1 Yuu 2 Garden Figure 5 Splash (Mizuto) grains Hiruakichiku]

Claims (1)

[Claims] At the bottom of the demister installed in the steam flow path that communicates the flash chamber and condenser chamber of the flash evaporation type fresh water generator,
A Hula Nyu evaporative water generation device characterized by a large number of folded plates arranged in parallel at intervals.