JPS6220879B2 - - 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 self-weight of the acidic condensed water is lost at the damming part (protruding part) of the treatment tank 8, it will rapidly flow into the next treatment tank 8, so that the constant inflow of acidic condensed water will be affected. Since intermittent 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 discharged.

Moreover, since the reaction amount of the neutralizing agent 10 on the inlet 4 side, which has high acidity, is larger than that of the neutralizing agent 10 on the outflow port 5 side, it is consumed rapidly and disappears quickly. Therefore, the amount of neutralizing agent 10 on the inlet 4 side disappears, and the amount of neutralizing agent 10 on the inlet 4 side disappears.
Since it is necessary to provide the neutralizer 10 in advance on the side, there are disadvantages in that the condensed water discharged from the outlet 5 becomes alkaline and that the neutralization processing apparatus itself becomes larger than necessary.

The third problem is that when installed in an oil water heater or gas water heater, etc., the latent heat type heat exchanger becomes clogged due to insoluble foreign matter such as corrosive components and airborne dust. It is a decline in ability. This is because the cylindrical neutralizer 10 is in line contact with the bottom surface of the processing tank 8 and is in direct contact with both side walls of the main body 1, so that insoluble foreign matter contained in the acidic condensation water can be removed from the neutralizer 10 and the side walls of the main body 1. 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 present invention provides a tongue portion having a guide groove for guiding acidic condensed water on the upper part of a partition plate constituting a processing tank, and arranges a cylindrical basic substance with a gap in the processing tank, and the basic substance The above-mentioned conventional drawbacks are solved by configuring the contact area between the acidic condensed water and the acidic condensed water to increase from the inlet-side treatment tank to the outflow-side treatment tank for the acidic condensed water. be.

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, 6c, 6d
and the box body 2 are integrally constructed, and a plurality of sedimentation tanks 7 and processing tanks 8a, 8b, and 8c are provided in the box body 2 in a stepwise manner. These partition plates 6a, 6b, 6c, 6
The height of d increases as it goes downward, and the processing tanks 8a, 8b, and 8c are configured to be deeper in this order. 9 indicates processing tanks 8a, 8b, 8 as shown in FIG.
On this protruding part 9, cylindrical neutralizers 10a, 10b, and 10c made of magnesium, which is a basic substance, are provided, respectively. Reference numerals 11a, 11b, 11c, and 11d are tongues made of acrylic resin adhered to the upper parts of partition plates 6a, 6b, 6c, and 6d made of acrylic resin with methyl ethyl kent, and as shown in FIG. A guide groove 12 is provided to guide the acidic condensation water from the processing tank 8a to the neutralizer 10b of the processing tank 8b below, and the tongues 11a, 11b, 11c, and 11d 1st
As shown in the figure and FIG. 4, the neutralizing agent 10a in the processing tank 8a is configured so that the space between the partition plate 6a and the space between the partition plates 6b and 6b is larger, so that the acidic condensation water flows. We make it easy.

13 is an air hole provided in the upper part of the lid body 3.

These neutralizers 10a, 10b, 10c are Mg96
%, Al3%, and Zn1% by weight, and has an outer diameter of 20 mm, an inner diameter of 12 mm, a height of 25 mm, and a weight of 8.6 g.
With the neutralizers 10a, 10b, and 10c contained in the container, the contact area with the acidic condensation water is determined by the neutralizer 1.
0a is 7.0 cm ² , 10b is 12.0 cm ² , and 10c is 17 cm ² , so that the contact area increases toward the outlet 5 side.

Next, the operation and effect of the acidic condensation water treatment apparatus configured as described above will be explained. Sn95% on the surface
A latent heat type heat exchanger plated with 5% Bi was attached to a gas water heater, and 120 ml of acidic condensation water with a pH of 4.0 and a temperature of 30°C generated on the surface of the latent heat type heat exchanger was added to the gas water heater.
The neutralizing agent 10a is introduced from the inlet 4 into the main body 1 at a rate of When the neutralizing agent 10a is dropped inside, it flows out of the cylinder from the bottom of the neutralizing agent 10a, passes through the guide groove 12 of the tongue 11b provided on the upper part of the partition plate 6b of the processing tank 8a, and is dropped into the next stage of the neutralizing agent 10b. When we measured the pH of the acidic condensation water that was finally discharged from the outlet 5 to the outside of the main body 1, we found that the initial pH was as shown in Figure 5.
7.3, and the pH after 3000 hours was 6.9, which was 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 is not clogged, and the neutralizers 10a and 10
The changes in surface area of samples b and 10c were almost the same as in the initial state.

In addition, the contact area between the neutralizer 10a provided in the treatment tank 8a on the inlet 4 side of the acidic condensed water and the acidic condensed water is made smaller, and the contact area is increased as it goes to the treatment tank 8c on the outlet 5 side. Depending on what you want to do, neutralizer 10 provided in each treatment tank 8a, 8b, 8c
Since the consumption rates of neutralizing agents a, 10b, and 10c are approximately average, it is very convenient that the neutralizing agents 10a, 10b, and 10c can be replenished at once.

Note that the neutralizers 10a, 10b, and 10c used as the cylindrical basic substances in this example were made of Mg alloy, but carbonates or oxides of Mg, K, Na, Li, Ca, Ba, etc. One or more hydroxides may be used.

In addition, the lid body 3 and the tongue portions 11a, 11b, 11c, 1
1d, the settling tank 7 and the processing tanks 8a, 8
It becomes a bypass path when b and 8c become clogged.

As is clear from the above description, the following effects can be expected with the acidic condensation water treatment apparatus of the present invention.

(1) By reducing the contact area between the basic substance installed in the treatment tank on the inlet side of the acidic condensed water and the acidic condensed water, and increasing the contact area toward the outlet side, each treatment Since the reaction between the basic substance provided in the tank and the acidic condensed water takes place almost evenly, the condensed water from the outlet is always discharged in a neutral state, and is used to replenish the basic substance. It is easy to use and convenient, as it can be done all at once.

(2) Acidic condensation water flows from the inside of the cylindrical basic material to the outside, and then overflows from the top of the partition plate that makes up the processing tank and flows into the basic material in the next processing tank, resulting in acidic condensation. The neutralization reaction between the dew condensation water and the basic substance can be reliably carried out, and the flow path of the acidic condensation water is less likely to be clogged.

(3) Since the basic substance is cylindrical, there is little change in the surface area of the basic substance even if it is consumed by reacting with acidic condensed water, and stable neutralization ability can be exhibited.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of an acidic condensation water treatment device showing an embodiment of the present invention, and FIG.
3 is a perspective view showing the main parts of FIG. 1, FIG. 4 is a plan sectional view taken along line B-B' in FIG. 1, and FIG. 5 is a neutral view of the same. The characteristic diagram, FIG. 6, is a side sectional view of a conventional acidic condensation water treatment apparatus. 1...Main body, 4...Inflow port, 5...Outflow port, 6
a, 6b, 6c, 6d...partition plate, 8a, 8b,
8c... Processing tank, 10a, 10b, 10c... Neutralizing agent (basic substance), 11a, 11b, 11c,
11d...tongue.

Claims (1)

[Claims] 1. A tongue having a guide groove for guiding acidic condensed water is provided on the upper part of the partition plate constituting the treatment tank, and a cylindrical basic substance is arranged with a gap in the treatment tank,
A treatment device for acidic condensed water, wherein the contact area between the basic substance and the acidic condensed water increases from the treatment tank on the inlet side to the treatment tank on the outlet side of the acidic condensed water.