JPS6220878B2 - - Google Patents

Description

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

This year, from the perspective of energy conservation, highly efficient combustion equipment such as oil water heaters and gas water heaters is required, and combustion equipment equipped with latent heat type heat exchangers that recover latent heat contained in combustion gas has been developed. Ta.

However, the carbon dioxide and nitrogen oxides in the combustion gas dissolve in the condensed water that forms on the surface of this latent heat type heat exchanger, forming acidic condensed water. If this acidic condensed water is discharged as it is, it may corrode the pipes. Because of problems such as melting of concrete, a neutralization treatment device that chemically neutralizes it has become necessary.

Conventionally, this type of acidic condensation water neutralization treatment equipment
As shown in the figure, a plurality of processing tanks 8 in which a neutralizing agent 10 made of a cylindrical basic substance is disposed inside the main body 1 are arranged in series and in several stages, and the acidic condensed water is processed from the inlet 4. It flows into the tank 8, sequentially flows downstream while coming into contact with the neutralizing agent 10, is neutralized, and is discharged from the outlet 5 to the outside of the main body 1.

The first problem with the apparatus for neutralizing acidic condensed water constructed in this manner is that the neutralization ability varies depending on the flow direction of the acidic condensed water.

In other words, if the balance between the surface tension and its own weight of acidic condensed water is disrupted at the dam of the treatment tank 8, it will rapidly flow into the next treatment tank 8. Since flow occurs and the solution is discharged without sufficient reaction time, it has the disadvantage that it is discharged from the outlet 5 in a highly acidic state.

The second problem is that since the neutralizing agent 10 has a cylindrical shape, when it reacts with acidic dew water and dissolves, the surface area becomes small and the neutralizing ability is reduced. In other words, since the neutralization treatment of acidic condensed water requires a surface area of the neutralizer 10 that corresponds to the strength of acidity and the flow rate, a decrease in surface area leads to a decrease in neutralization ability, resulting in a highly acidic state. As a result, it is emitted.

The third problem is that when installed in a petroleum water heater or gas water heater, etc., the latent heat type heat exchanger becomes clogged due to insoluble foreign matter such as corrosive substances and dust in the air. This is a decline in ability. This is because the cylindrical neutralizer 10 is in line contact with the bottom of the processing tank 8 and in surface contact with both side walls of the main body 1, so that insoluble foreign matter contained in the acidic condensation water is absorbed by the neutralizer 10 and the side walls of the main body 1. Otherwise, it accumulates in the contact area with the bottom surface of the treatment tank 8, causing clogging, which causes a decrease in the neutralization ability.

The fourth problem is the treatment tank 8 in which the neutralizer 10 is installed.
Since it is fixed to the main body 1 with an adhesive, it is vulnerable to freezing and acid resistance. Therefore, when a predetermined amount of acidic condensation water flows into the treatment tank 8,
Water leaks from the adhesive part between the main body 1 and the processing tank 8,
When the dew condensation water freezes, the main body 1 and the treatment tank 8 separate, resulting in water leakage.

The present invention includes a main body having an inlet and an outlet, a box constituting the main body, a plurality of step-shaped processing tanks formed by partition plates provided between both side walls of the box, and a plurality of step-shaped processing tanks. A cylindrical basic substance is detachably provided with a space between the side wall and the bottom of the tank, and a cylindrical basic substance is provided at the top of the partition plate to guide acidic condensation water from the upper processing tank to the lower processing tank. The box body and the partition plate are integrally molded to solve the above-mentioned conventional drawbacks.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In Fig. 1, 1 is the main body of the acidic condensation water treatment device, and this main body 1 consists of a box 2 made of acrylic resin with a thickness of 3 mm and a lid 3, with an inlet 4 at the top and an inlet 4 at the bottom. An outlet 5 is provided.

6a, 6b, 6c, 6d are partition plates provided between both side walls of the box body 2, and these partition plates 6a, 6b, 6
c, 6d and the box body 2 are integrally constructed, and the sedimentation tank 7
A plurality of processing tanks 8a, 8b, and 8c are provided in the box body 2 in a stepwise manner. Reference numeral 9 denotes a protrusion provided at the bottom of the processing tanks 8a, 8b, 8c as shown in FIG.
c are provided respectively. 11a, 11b, 11
c is partition plates 6a, 6b, 6 made of acrylic resin.
As shown in FIG. 3, a tongue part with acrylic resin glued with methyl ethyl Kent on the upper part of c is used to transfer the neutralizing agent 10a from the settling tank 7 to the processing tank 8a from the processing tank 8a to the lower processing tank 8b. A guide groove 12 is provided for guiding acidic condensation water into the inside of the treatment tank 8a, and the tongues 11a, 11b, 11c allow the neutralizing agent 10a in the processing tank 8a to pass through the partition plate 6.
Between the space a and the space 6b, the space 6b is configured to be larger so that the acidic condensation water can easily flow. 13 is an air hole provided in the upper part of the lid body 3.

These neutralizers 10a, 10b, 10c are Mg96
The neutralizing agent 10a, 10b, 10c is made of an alloy of %, Al3%, and Zn1% by weight, and has an outer diameter of 20 mm, an inner diameter of 12 mm, and a height of 25 mm. The neutralizers 10a, 10b,
It is arranged so that it is 10 mm from the bottom of 10c.

Next, the operation and effect of the acidic condensation water treatment apparatus configured as described above will be explained.

A latent heat type heat exchanger with a tin-plated surface is attached to a gas water heater, and acidic dew water with a pH of 4.0 and a temperature of 30°C generated on the surface of the latent heat type heat exchanger is flowed at a rate of 120 ml/h. When introduced into the body 1 from the inlet 4, corrosion products from the latent heat exchanger and dust in the air are removed in the settling tank 7, and dripped into the cylinder of the neutralizer 10a from the guide groove 12 of the tongue portion 11a, the neutralizer is It flows out of the cylinder from the bottom of the neutralizing agent 10a, passes through the guide groove 12 of the tongue portion 11b provided on the partition plate 6b of the processing tank 8a, is dripped into the next neutralizing agent 10b, and finally flows through the outflow port 5. When we measured the pH of the acidic condensation water discharged from the main unit 1, we found that the initial pH was 7.3 and the pH after 3,000 hours was 6.9, as shown in Figure 5, and we were able to maintain a neutral state. .

In addition, after 3000 hours, insoluble foreign matter such as corrosion products of the latent heat exchanger and dust in the air had accumulated at the bottom of the settling tank 7 and each processing tank 8a, 8b, and 8c. By providing the protrusions 9 in 8b and 8c, the acidic condensation water flow path was not clogged.

In addition, a predetermined amount of acidic condensation water with a pH of 4.0 is put into the treatment tanks 8a, 8b, and 8c, and a cycle is performed in which the water is left to freeze at -20°C for 3 hours, and then thawed at 30°C for 3 hours.
Although the test was repeated 10 times, no water leakage occurred due to separation between the box body 2 made of acrylic resin and the partition plates 6a, 6b, 6c, and 6d.

As described above, according to the acidic condensation water neutralization treatment apparatus of the present invention, the following effects can be obtained.

1. By configuring the processing tank by integrally molding the box and the partition plate, it is possible to prevent water leakage due to separation between the box and the partition plate even if the acidic condensation water freezes.

2. Acidic condensation water flows from the inside of the cylindrical basic material to the outside, overflows from the top of the partition plate that makes up the processing tank, and flows into the basic material provided in the next processing tank. Therefore, it is sure to react with basic substances and be neutralized.

3. Since the basic substance is cylindrical, even if it reacts with acidic dew water and dissolves, the surface area of the basic substance decreases at a small rate, so the neutralization ability can be kept almost constant.

4. A cylindrical basic material is provided in the processing tank and the bottom of the processing tank with a space so that it can be attached and removed freely, and in order to cause acidic condensation water to flow from the inside of the basic material to the outside and cause a neutralization reaction, latent heat type heat is used. This prevents insoluble foreign matter such as corrosion products of the exchanger and dust in the air from clogging the flow path of the acidic condensation water.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an acidic condensation water treatment device showing one embodiment of the present invention, and FIG.
- A front sectional view taken along line A', Figure 3 is a perspective view showing the main parts of Figure 1, Figure 4 is a plan sectional view showing the main parts taken along line B-B' in Figure 1, and Figure 5. The figure is a neutralization characteristic diagram, and FIG. 6 is a side sectional view of a conventional example of a neutralizing device for acidic condensed water. 1...Body, 2...Box, 6a, 6b, 6c,
6d... Partition plate, 8a, 8b, 8c... Processing tank,
10a, 10b, 10c...neutralizing agent (basic substance), 11a, 11b, 11c...tongue, 12...
...Guide groove.

Claims (1)

[Claims] 1. A main body having an inlet and an outlet, a box constituting this main body, a plurality of step-shaped processing tanks formed by partition plates provided between both side walls of this box, and a plurality of step-shaped processing tanks of this processing tank. a cylindrical basic substance that is removably provided with a space between the side wall and the bottom; and a guide groove that is provided at the top of the partition plate and guides acidic condensation water from the upper processing tank to the lower processing tank. A treatment device for acidic condensed water, comprising a tongue portion provided with a tongue portion, and the box body and the partition plate are integrally molded.