JPS61125496A - Device for preventing scale formation - Google Patents

Abstract

PURPOSE:To obtain water having the quality of extremely low power to form scale in a water flow system after this device by bringing mineral components such as Ca<2+> ions in an aq. soln. to contact with catalytically activated collision members to deposit positively said components then separating and capturing the deposited components. CONSTITUTION:The catalytically activated through-shaped collision members 11 are provided in the magnetic field of a magnet 10 in a reaction chamber 3 and the mineral components such as Ca<2+> and Mg<2+> in the aq. soln. are brought into collision against the members 11 to accelerate the deposition of the components thereof. Shielding members 13 having many fine pores on the surface are provided in a separating chamber 14 formed of a thermoplastic resin in succession to said chamber and the deposits formed in the chamber 3 are stuck to the fine pores of the members 13, by which the deposits are separated. The fine particles of said deposits are captured in a dust collecting chamber 5. The quality of the water having the extremely low power to form scale is thus obtd. in the water flow system beyond this device.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a scale prevention device, which is suitable for use in aqueous solutions used in primary cleaning systems in the manufacturing process of heat exchangers in general, water heaters, cleaning machines, semiconductors, etc. from.

The present invention relates to a scale prevention device suitable for removing mineral components such as Ca2+ and Mg2+ and obtaining an aqueous solution that does not have the ability to generate scale.

[Background of the invention]

Mechanical equipment that uses seawater as cooling water, such as power plant condenser heat exchangers, seawater desalination plant cooling heat exchangers, solar thermal utilization systems, water heaters,
BACKGROUND ART In beverage vending machines, washing machines, etc., efforts are being made to improve thermal efficiency and cleaning efficiency, and there is a demand for softer water quality.

Conventionally, some commercially available scale preventers use a magnetic field.

However, these scale preventers simply pass running water through a magnetic field, which increases the tendency for scale to adhere.

Note that there is nothing particularly noteworthy as prior art information regarding the scale prevention device of the present invention.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned prior art, and is based on Ca'', which is a factor in the formation of scale from running water.

Mineral components such as M g3 + ions are actively precipitated and separated and collected, and the flowing water system after this device is
The purpose of this invention is to provide a scale prevention device that can obtain water quality with significantly low scale-forming ability.

[Summary of the invention]

The structure of the scale prevention device according to the present invention is a scale prevention device that removes mineral components such as Ca2+ and Mg2+ ions contained in an aqueous solution and obtains water quality free of scale generation ability. A reaction chamber is provided with a trough-like collision member in which the mineral components such as Ca'' and Mg'+ ions in the aqueous solution collide with the collision member to promote precipitation of these compounds; a separation chamber in which a shielding member having a large number of micropores on one surface is provided in the chamber, and the precipitates generated in the reaction chamber are attached to the micropores of the blocking member to separate the precipitates;
It is equipped with a dust collection chamber that collects fine particles of the precipitate.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 5.

Here, FIG. 1 is a block diagram of a scale prevention device according to an embodiment of the present invention, and (a) is a sectional view of each component,
The dashed-dotted line indicates the center line that is the common center when each element is assembled, (b) is a longitudinal cross-sectional view of the device in which each component is assembled (the hatching indicating the cross section is omitted because the figure is small), (c) is a top view of (b), (d) is a top view of (b)
bottom view.

Figure 2 is a detailed sectional view of the reaction chamber shown in Figure 1, and Figure 3 is a detailed view of the separation chamber shown in Figure 1, where (a) is a longitudinal sectional view, and (b) is a top view of (a). Fig. 4 is a micrograph showing calcium carbonate adhering to the separation chamber 1; Fig. 5 is a movement of fluid passing through the scale prevention device of Fig. 1. It is an overall diagram showing a route.

In FIG. 1, 1 is a water intake pipe, 2 is a steel casing, and 3 is C ai + dissolved in flowing water.

4 is a separation chamber that separates solid precipitates from a fluid; 5 is a dust collection chamber that collects these solid precipitates; 6 is a A drain pipe, 7 a casing cover, 8 a seal ring, and 9 a cap nut.

This scale prevention device is assembled by inserting a reaction chamber 3 and a separation chamber 4 into a casing 2 to which a water intake pipe 1 is fixed as shown in FIG. The casing cover 7 is fastened to the threaded portion 2a of the recasing 2 with a cap nut 9 via a seal ring 8.

Next, the configuration and functions of these main components will be explained each time.

The reaction chamber 3 shown in FIG. 1 is specifically constructed as shown in FIG.

In FIG. 2, 10 is a permanent magnet having an arcuate cross section, 10a is a magnetic path related to the magnetic field of the magnet (the space between the N pole and the S pole), and 11 is the magnetic field inserted as shown by the white arrow. This is a copper trough for a trough-like impact member installed vertically in the channel 10a.

The permanent magnet 10 is housed in a resin magnet casing 12 for corrosion protection.

Here, the gutter 11 is immersed in advance in a stannous chloride hydrochloric acid solution to adsorb Sn1 ions on the surface, and then further brought into contact with a palladium chloride hydrochloric acid solution to form an oxidation filter shown in the following formula (1). Through the reduction reaction, active palladium Pd' is generated on the surface to activate the catalyst.

S n"+P d"-+S n'"+Pd' ・(
1) Furthermore, by cathodically polarizing the main body of the gutter 11, the surface thereof exhibits alkalinity because a cathodic reaction as shown in equation (2) below continues.

2 Ht O+ O== + 4 a→40H・(2)
When the aqueous solution flows through the gutter 11 of the reaction chamber 3, the mineral components in the fluid are electrically charged and are therefore subjected to a force F as shown in the following equation (3) due to the magnetic flux of the permanent magnet 10.

F=e−v−BSinθ (3)
Here, e: Charged ions v: Moving speed of e B: Magnetic flux density This direction F acts to cause the ions to collide with the wall of the gutter 11, so that concentration of mineral component ions occurs on the surface of the gutter 11. , these mineral ions are concentrated to a saturating concentration.

Next, since the surface of the gutter 11 is catalytically active, the reaction of these concentrated ions to produce carbonates and hydroxides is promoted.

For example, to explain the effect of promoting the production of calcium carbonate, first, Ca'' ions are concentrated on the surface of the gutter 11, and at the same time, carbonic acid in the aqueous solution is also concentrated on the surface of the gutter 11.

In this case, since the area near the surface of the gutter 11 is alkaline, there is a very high probability that the existing form of carbonic acid is co.
Therefore, on the surface of @11, the production of calcium carbonate is promoted starting from the catalytic action as shown in the following equation (4).

Ca”+CO,”−→CaC0,・= (4) Next,
The separation chamber 4 for separating these precipitates from the fluid will be explained.

The specific shape of the separation chamber 4 is shown in FIG.

The separation chamber 4 is made of a thermoplastic resin made of three components, typified by ABS resin, acrylonitrile, butadiene, and styrene.

After the separation chamber 4 is formed into the shape shown in FIG. 3, when its inner surface is brought into contact with a-sulfuric acid, the butadiene dispersed in the ABS resin is selectively oxidized and melted, and the surface contains:
Many fine corrosion holes with a depth of about 1 to 5 μm are generated.

Precipitates are easily fixed in this large number of micropores.

Once a precipitate is fixed, the next precipitate tends to accumulate in that area, so the shape of the separation chamber with many micropores on its surface separates the precipitate from the fluid. It has a remarkable effect on

FIG. 4 is a micrograph showing the state of fixation of calcium carbonate (Aragonita).

In the separation chamber 4, there are 3 shielding members in the upper layer and the lower layer, respectively.
A plurality of shielding plates 13 are installed, and the fluid flowing out from one reaction chamber 3 is guided by the shielding plates 13 and flows within the separation chamber 4 along the movement path shown by white arrows and solid line arrows in FIG.

During this time, fine particles of precipitate are deposited on the corners of each shielding plate 13 and in a large number of micropores on the surface of the shielding plate 13 .

Further, a portion A in FIG. 3 is in contact with the dust collection chamber 5, and the fine particles of precipitate are deposited in the dust collection chamber 5 from this portion.

FIG. 5 shows an overall view of the movement path of the fluid flowing through the scale prevention device of this embodiment. In the figure, the same reference numerals as in FIG. 1 indicate the same parts, so the explanation will be omitted.

Fluid flow is as shown by white arrows, solid lines and solid arrows.

That is, the flowing water flowing in from the water intake pipe 1 collides with the wall of 4i111 in the magnetic path of the permanent magnet 10 of the first reaction chamber 3, promotes the precipitation of compounds, and then enters the separation chamber 4 to remove the fine particles on the surface of the shielding plate 13. Precipitates adhere to the pores and are separated from the flowing water.

Fine particles of this precipitate precipitate and accumulate in the hot dust chamber 5,
These deposits can be removed by opening the drain 14.

Further, the reaction chamber 3 is electrically connected to the casing 2, and the cathode polarization of the reaction chamber 3 itself is performed by the sacrificial anode 15 connected to the casing 2.

Next, the scale prevention device of this example was incorporated into the heat transfer performance measuring device shown in FIG. 6, and the scale prevention effect was experimentally verified.

Here, FIG. 6 is a system diagram of the heat transfer performance measuring device.

FIG. 7 is a diagram of heat transfer rate showing experimental results using the apparatus shown in FIG.

The test water for this experiment was calcium chloride CCaCQ2.2H
, O) and sodium hydrogen carbonate (NaHCO□), M alkalinity: 600 CaCO, PPRI, calcium hardness: 630 CaCO, ppm, 8.
1 was used as cooling water.

This sample water was circulated for a certain period of time through the two systems of heat exchange equipment shown in FIG. 6, and the effect on the heat transfer performance of the heat transfer tubes was investigated.

In the heat transfer performance measuring device shown in FIG.
2. Cooling unit 1 via valve 18-1.18-2
9 and introduced into heat exchangers 20-1 and 20-2 of each system.

Return to tank 16-1 and 16-2 again.

The flow is as shown by the two-dot chain arrow.

Here, the scale prevention device 21 of this embodiment was arranged in a pipe line leading to one heat exchanger 20-2.

Note that the temperature of the cooling unit 19 is controlled by a temperature control device 22 .

On the other hand, the hot water flowing through the heat exchangers 20-1 and 20-2 is also temperature-controlled in the hot water tank 23, as in the case of cooling water.
Pumps for each of the two systems from 24-1.24
-2. The aforementioned heat exchanger 20-1.20 flows through the valves 25-1 and 25-2 as a counterflow indicated by the three point lIi line arrows.
-2 and then returned to tank 23.

In order to evaluate heat transfer performance, heat exchanger 20-1゜20-
Temperature sensor 26 detects the temperature of each inlet and outlet of cooling water and hot water.
It was measured by

The results of the experiment are shown in FIG.

In Fig. 7, the horizontal axis shows the time (h) of sample water circulation, and the vertical axis shows the heat transfer rate of the heat exchanger tube (kcajl/-・℃・
h), and the heat transfer rate line is the solid line for the system equipped with the scale prevention device 21, and the dashed line for the system equipped with the scale prevention device 21.
This figure shows the results for a system without .

As is clear from FIG. 7, when the scale prevention device 21 of the present embodiment is not provided, scale adhesion is significant on the cooling surface of the heat exchanger tubes of the heat exchanger 20-1, and the heat transfer rate is indicated by the dashed-dotted line. It gradually decreased as follows.

On the other hand, in the route where the scale prevention device 21 was installed, there was almost no scale adhesion to the cooling surface of the heat exchanger tubes of the heat exchanger 20-2, and no decrease in the heat transfer rate was observed as shown by the solid line in FIG. There wasn't.

〔Effect of the invention〕

As described above, according to the present invention, mineral components such as Ca2+ and Mg2+ ions, which are factors for scale formation, are actively precipitated from flowing water, and these are separated and collected to be added to the flowing water system after one device. can provide a scale prevention device capable of obtaining water quality with significantly low scale-forming ability.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a scale prevention device according to an embodiment of the present invention, in which (a) is a sectional view of each component, and (b) is a
A vertical cross-sectional view of the device with its components assembled, (c)
(b) top view, (d). (b) is a bottom view, FIG. 2 is a detailed sectional view of the reaction chamber in FIG. 1, FIG. 3 is a detailed view of the separation chamber in FIG. 1, (a) is a longitudinal sectional view, and (b) is a top view of (a). (c) is a bottom view of (a), Figure 4 is a micrograph showing calcium carbonate adhering to the separation chamber, and Figure 5 shows the movement path of fluid passing through the scale prevention device in Figure 1. 6 is a system diagram of the heat transfer performance measuring device, and FIG. 7 is a diagram of heat transfer rate showing experimental results using the device of FIG. 6. 1... Water intake pipe, 2... Casing, 3... Reaction chamber, 4... Separation chamber, 5... Dust collection chamber, 6... Drain pipe, 10... Permanent magnet, 10a ...Magnetic path, 11...
Gutter, 13... Shielding board. 15...Sacrificial anode.

Claims (1)

[Claims] 1. A scale prevention device that removes mineral components such as Ca^2^+ and Mg^2^+ ions contained in an aqueous solution and obtains water quality free of scale generation ability, which A catalytically activated trough-like collision member is provided in the magnetic field, and mineral components such as Ca^2^+ and Mg^2^+ ions in the aqueous solution collide with the collision member to promote precipitation of these compounds. A reaction chamber and a shielding member having a large number of micropores on its surface are provided in the chamber made of thermoplastic resin, and the precipitates generated in the reaction chamber are allowed to adhere to the micropores of the shielding member. 1. A scale prevention device comprising: a separation chamber that separates the precipitates; and a dust collection chamber that collects the fine particles of the precipitate. 2. In the product described in claim 1, the cathode polarization of the catalytically activated collision member of the reaction chamber is maintained through a sacrificial anode that is in contact with a casing surrounding the reaction chamber. An anti-scaling device.