JPS6220874B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for treating acidic condensation water generated during latent heat exchange in oil water heaters, gas water heaters, and the like.

In recent years, there has been a need for highly efficient combustion appliances such as oil water heaters and gas water heaters from the perspective of energy conservation, and combustion appliances having heat exchangers that recover latent heat contained in combustion exhaust gas have been developed. However, on the surface of this latent heat recovery heat exchanger, acidic condensation water that dissolves carbon dioxide, nitrogen oxides, etc. in the combustion exhaust gas is generated, and if this acidic condensation water is discharged as it is, it may cause corrosion of pipes and concrete. Because of problems such as dissolution of substances, treatment mechanisms for chemically neutralizing them have been developed.

In these processing mechanisms, a basic substance is installed in one or more processing tanks, and a chemical treatment is performed by sequentially flowing dew water. Conventionally, the processing mechanism shown in FIG. 1 has been developed. This processing mechanism
A uniform disk-shaped basic substance 3 is installed in the treatment tank 2 formed in The treated water was discharged from the treated water outlet section 5. In this treatment mechanism, the treatment tank 2 has a structure as shown in Fig. 1, in which a plurality of treatment tanks are arranged in series and arranged in several stages. When the balance between surface tension and its own weight was disrupted, the water mass rapidly flowed into the next tank due to the surface tension, causing a chess-like flow. Therefore, an intermittent flow is formed in response to the steady inflow of acidic condensation water, and the flow occurs without sufficient reaction time, resulting in the problem that the treated water is discharged from the treated water outlet 5 with high acidity. . In addition, an upper wall is provided to prevent the basic substance 3 from falling out of the treatment tank 2 during handling or transportation of the mechanism, so that the acidic condensation water is dripped correctly during the first treatment of the next stage. Because the water does not enter the tank and drips down the upper wall, or flows down the upper wall to one stage after another, there is a problem in that highly acidic condensed water is discharged without being treated properly. . This problem was also observed in a processing mechanism having a structure as shown in FIG. 1, in which one processing tank was provided in each stage and several stages were arranged vertically.

On the other hand, the basic substance 3 is a uniform disk-shaped substance arranged in series. When condensed water with high acidity flows in from the treated water inlet 4, it reacts with the basic substance installed on the inlet side, and the acidity of the condensed water decreases.
The more basic the substance in the subsequent treatment tank, the more it will react with the condensed water, which has a lower acidity. For this reason, the reaction amount of basic substances on the inlet side, where the acidity of the acidic condensation water is high, is greater than the reaction amount of basic substances on the outlet side, and the basic substances on the inlet side are rapidly consumed. It comes to disappear. In the treatment of acidic condensed water, there is a required amount and residence time of basic substances depending on its acidity, flow rate, and temperature, and it is necessary to prepare and secure in advance the amount of basic substances on the outlet side that disappears on the inlet side. However, there was a disadvantage in that the amount of basic substance needed to be used was more than necessary, and the mechanism was made larger than necessary. Further, the excess basic substance located further toward the outlet than the basic substance required to treat the acidic condensed water causes the dew condensed water to shift to the highly alkaline side, and is also wasteful as it is eluted in excess.

Since basic substances are disk-shaped with uniform shape and weight, when they react with acidic condensed water, the basic substances dissolve and the surface area becomes smaller, and the amount of basic substances eluted becomes smaller. Neutralization processing capacity decreases. This phenomenon is larger toward the inlet side of the acidic condensed water for the reason mentioned above.

The present invention eliminates such drawbacks, prevents acidic condensed water from being discharged with high acidity, and makes the surface area of the basic substance almost constant without changing over time, so that acidic condensed water can be discharged with high acidity. Since the amount of basic substance on the inlet side is increased,
To provide a small-sized acidic condensation water treatment device that always performs reliable neutralization treatment without changing over time, eliminates the silence of basic substances, and optimizes the amount used.

Embodiments of the present invention will be described in detail below with reference to the drawings.

Embodiments of the invention are illustrated in FIGS. 2, 3, 4, 5, 6, and 7.

In the figure, 1 is the body, 2 is the treatment tank, 3 is the basic substance, 4 is the treated water inlet, 5 is the treated water outlet, 6 is the condensed water inlet, 7 is the condensed water outlet, and 8 is the bypass flow path. .

The mechanism is a processing tank 2 formed in the body 1.
Acidic condensed water flows into the basic substance 3 installed at the treated water inlet section 4, forms a flow sequentially from the inflow side to the outflow side, is neutralized, and then passes through the treated water outlet section 5.
It is more excreted. In the treatment tank 2,
The acidic condensed water flows into the condensed water inlet 6, contacts the basic substance 3 and reacts, and then flows into the dew condensed water outlet 7.
It flows out and is sent to the next treatment tank. Through this flow procedure, the acidic condensed water flows sequentially from the inflow side to the outflow side and is neutralized. In the treatment tank 2, the condensed water inlet 6 is located at a lower position than the condensed water outlet 7, so that the acidic condensed water always reacts with the basic substance 3 and is not discharged with high acidity. The bypass channel 8 is a channel through which acidic channel water passes when it is clogged.

FIG. 2 shows a processing mechanism in which processing tanks 2 are arranged vertically. The condensed water inlet 6 is located at a lower position than the condensed water outlet 7, and the acidic condensed water flows in from the condensed water inlet 6 and reacts with the basic substance 3, and then flows out from the condensed water outlet 7 to form condensation in the next treatment tank. It is guided to the water inlet. Through this flow procedure, acidic dew condensation water is neutralized by sequentially forming a flow from the inflow side to the outflow side.

FIG. 3 shows a processing mechanism in which processing tanks 2 are arranged diagonally at an angle of θ with respect to the horizontal line. The condensed water inlet 6 is located at a lower position than the condensed water outlet 7,
According to the flow procedure described above, the acidic condensed water is neutralized by sequentially forming a flow from the inflow side to the outflow side.

Basic substance 3 is used in the form of pellets, plates, spheres, wedges, and tubes, and the tube shape was particularly suitable because the surface area does not change much even when dissolved.
A tubular basic substance is optimal because the surface area of the basic substance remains constant without changing over time, which is necessary for maintaining the neutralization processing ability constant without changing over time.

Further, since the more acidic condensed water flows toward the inlet side, the more acidic the condensed water, the more basic substances are dissolved. On the other hand, since condensed water with a lower acidity flows toward the outlet side, a small amount of basic substances are dissolved. Therefore, the wall thickness of the tubular basic substance was made larger on the treated water inlet side of the treatment mechanism, and smaller on the treated water outlet side. Furthermore, in order to make the processing mechanism more compact, the tubular basic substance may be used singly or in multiples such as double or triple. They may be used in parallel in the same treatment tank.

FIG. 4, FIG. 5, FIG. 6, and FIG. 7 show examples regarding the shape of the basic substance 3.

Figure 4 shows a basic substance 3 in a tubular shape and a processing tank 2.
The thickness of the basic substance 3 installed in the treatment tank 2 on the treated water inlet part 4 side is increased, and the basic substance 3 installed in the treatment tank 2 on the treated water outlet part 5 side is increased. The wall thickness is reduced.

FIG. 5 shows a double pipe structure in which the basic substance 3 is tubular. In addition, the wall thickness was changed for each treatment tank 2, and the wall thickness of the basic substance 3 installed in the treatment tank 2 at the treated water inlet section 4 was increased, and the wall thickness of the basic substance 3 installed in the treatment tank 2 at the treated water outlet section 5 side was increased. The thickness of the sexual substance 3 is made small. The structure of basic substance 3 is triple tube,
A structure such as a quadruple pipe is also possible, and the treated water inlet section 4 side may have a plurality of stacked structures, and the treated water outlet section 5 side may have a single structure. Alternatively, a structure in which they are used in parallel may be used.

In Fig. 6, the basic substance 3 is shaped like a wedge-shaped tube, and the wall thickness is large on the treated water inlet section 4 side and tapers so that it becomes gradually smaller toward the treated water outlet section 5 side. Ta. Further, the thickness of the basic substance 3 installed in the treatment tank 2 on the treated water inlet section 4 side was made larger than the wall thickness of the basic substance 3 installed in the treatment tank 2 on the treated water outlet section 5 side.

In FIG. 7, the basic substance 3 is shaped like a wedge-shaped tube, and the wall thickness is changed for each treatment tank 2.
The thickness of the basic substance 3 installed in the treatment tank 2 on the treated water inlet section 4 side is increased, and the treatment tank 2 on the treated water outlet section 5 side is
The thickness of the basic substance 3 installed in the base is made small. Furthermore, basic substances 3 are used in parallel in the processing tank 2 .

The effects of the present invention were evaluated using the processing mechanism shown in FIG. The treatment mechanism has six uniform treatment tanks, and by using them at an angle of 30° to the horizontal, the total amount of condensed water that filled the six treatment tanks was approximately 120 c.c. Ta. In each treatment tank, three tubular metal magnesium tubes were installed in parallel with the flow.
The magnesium pipe has a length of 20 mm, and the outer diameter and wall diameter are optimized by making the wall thicker on the inlet side and tapering it gradually toward the outlet side. The outer diameter of the outlet was set to φ20 mm, and the outer diameter of the outlet side was set to φ15 mm. Further, the wall thickness of the magnesium pipe installed in the treatment tank on the treated water inlet side was made larger than that of the magnesium pipe installed in the treatment tank on the treated water outlet side. The surface area of this magnesium tube is approximately 20 cm ² , and the total area of the 18 magnesium tubes installed in the treatment tank is approximately 360 cm ² . Add 30% of acidic condensed water (15℃) with PH=3.0 to this treatment mechanism.
When the treated water was allowed to flow in from the inlet at a flow rate of ml/min, condensed water with a pH of 7.2 was discharged from the treated water outlet. In addition, with this treatment mechanism, the acidic dew water formed a steady flow and reacted with the magnesium, and was not discharged with high acidity.

According to the present invention, acidic dew water is always reliably neutralized without being discharged with high acidity. In addition, since the basic substance is used in an appropriate amount without wasting it, a compact acidic condensation water treatment mechanism has been realized.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional acidic condensation water treatment device.
FIG. 2 is a sectional view of an acidic condensation water treatment device (vertically arranged type) in one embodiment of the present invention, FIG. 3 is a sectional view of another similar device (diagonally arranged type), FIGS. 4, 5, 6 and 7 are cross-sectional views of the processing apparatus of the present invention. 1... Body, 2... Treatment tank, 3... Basic substance, 4... Treated water inlet, 5... Treated water outlet, 6... Condensation water inlet, 7... Condensation water outlet,
8...Bypass flow path.

Claims (1)

[Scope of Claims] 1. An acidic condensed water treatment device in which a basic substance is provided in a treatment tank, and a condensed water inlet of the treatment tank is located at a lower position than a dew water outlet. 2. The acidic condensation water treatment device according to claim 1, which uses a tubular basic substance. 3. The acidic condensation water treatment device according to claim 2, wherein the thickness of the tubular basic substance is larger on the treated water inlet side and smaller on the treated water outlet side. 4. The acidic condensation water treatment device according to claim 2, which uses tubular basic substances stacked on top of each other.