JPS6220875B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for neutralizing acidic condensed 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 the problems such as dissolving the substances, a neutralization treatment mechanism that chemically neutralizes them has become necessary.

Conventional neutralization treatment mechanisms install basic substances in one or more treatment tanks and perform chemical treatment by sequentially flowing dew water, and the neutralization treatment mechanism shown in Figure 1 was used. . This neutralization treatment mechanism has a body 1 equipped with a plurality of treatment tanks 3 in which disk-shaped basic substances 2 are installed, and acidic condensation water flows in from a condensation water inlet 4 and comes into contact with the basic substances 2. Meanwhile, a flow was formed sequentially to the downstream side, and the neutralized water was discharged from the dew condensation water outlet 5. In this neutralization processing mechanism, a plurality of processing tanks 3 are arranged in series in a tilted manner, and each row has several stages. The first problem with such a treatment tank is that the neutralization ability fluctuates depending on the flow direction of the treatment liquid. In other words, in conventional treatment tanks, a water mass is generated at the outflow end of the dam due to the surface tension of acidic condensed water, and when this water mass loses the balance between surface tension and its own weight, it rapidly flows into the next tank. A shogi-like situation was occurring. Therefore, an intermittent flow is formed in response to the steady inflow of acidic condensation water, and the water continues to flow to maintain sufficient reaction time, causing damage to the water as it is discharged from the treated water outlet 5 with high acidity. . In addition, an upper wall 6 is provided to prevent the basic substance 2 from falling out of the treatment tank 3 during handling or transportation of the mechanism, so that the first stage of the next stage where acidic condensation water should be dripped correctly is provided. Because the water does not enter the treatment tank and drips along 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 as specified. . The second problem is that since the basic substance 2 has a disk shape, when it reacts with acidic condensation water and dissolves, the surface area decreases, and as it dissolves, the neutralization ability decreases. Moreover, the reaction amount of the basic substance on the inlet side, where the acidity of the acidic condensation water is high, is greater than the reaction amount of the basic substance on the outlet side, and the basic substance on the inlet side is rapidly consumed and disappears. Since the treatment of acidic condensed water requires the number of processing stages N and residence time required depending on its acidity and flow rate, an extra number of stages in the latter stage is prepared in advance to compensate for the disappearance of the previous stage. It becomes necessary to secure the number of stages, and in order to realize the treatment of the predetermined processing amount, it is necessary to prepare an extra number of stages equal to the required number of processing stages N, and the amount of basic substance must be used in excess of the necessary amount. This had the disadvantage of not only being wasteful but also making the mechanism larger than necessary. In addition, in the above-mentioned reaction, in the stages after the number of processing stages N required to complete the treatment of the acidic condensed water, there was also the waste of basic substances being eluted without contributing to the reaction, resulting in a large waste. . The third problem is that when conventional neutralization processing mechanisms are used in oil water heaters, gas water heaters, etc., they can become clogged due to insoluble foreign matter such as corrosion products in the heat exchanger and dust in the air. However, the neutralizing ability was likely to decrease. This was because the basic substance 2 was in line contact with the processing tank 3 and in surface contact with the body 1. Therefore, the condensed water mixed with insoluble foreign matter hits the contact area between the basic substance 2, the treatment tank 3, and the body 1, and when the insoluble foreign matter accumulates there, it becomes clogged and does not flow, reducing the neutralization ability.

The present invention provides a mechanism for neutralizing acidic condensed water that solves these conventional problems. That is, the objects of the present invention are (1) to prevent acidic condensed water from being discharged with high acidity and to ensure that it reacts with basic substances and is always neutralized before being discharged; (3) To reduce the loss of neutralization ability due to the reaction of acidic substances with acidic condensation water and their dissolution, resulting in a smaller surface area; The aim is to make it difficult for the passages to become clogged and for the neutralization ability to be less likely to decline.

In order to achieve this object, the present invention arranges a cylindrical basic substance with a gap in a processing tank having a dam, guides acidic condensed water to the inner pipe part of the basic substance, and A flow of acidic condensation water is formed in which the acidic condensation water flows into the outer tube and comes into contact with the basic substance, and then overflows from the dam of the treatment tank. With this configuration, acidic dew condensation water comes into contact with the inner tube portion, outer tube portion, and bottom portion of the cylindrical basic substance, reacts, and is constantly neutralized before being discharged. On the other hand, the inner and outer tubes of the cylindrical basic substance react with acidic condensed water and dissolve, but the inner diameter of the inner tube increases as it dissolves, and the outer diameter of the outer tube increases as it dissolves. decreases, so there is little change in the contact area with acidic condensed water, and there is little decrease in neutralization ability due to dissolution of basic substances. Additionally, insoluble foreign substances such as corrosion products of heat exchangers and dust in the air are removed by a treatment tank installed to allow acidic condensation water to flow from the inner tube of the cylindrical basic substance to the outer tube. Since it is deposited in the gap between the cylindrical basic substance and the cylindrical basic substance, clogging of the channel becomes less likely to occur by ensuring a sufficient gap.

Embodiments of the present invention will be described below with reference to FIGS. 2, 3, and 4.
This will be explained using figures.

A flow is formed so that acidic dew condensation water is guided to the inner tube portion 9 of the cylindrical basic substance 8 placed in the treatment tank 7 . On the other hand, in order to provide a gap between the processing tank 7 and the cylindrical basic substance 8, the size of the processing tank 7 is made larger than the size of the cylindrical basic substance 8, and a protrusion is provided at the bottom of the processing tank 7. 10, the cylindrical basic substance 8 was made to float above the treatment tank 7. As a result, the acidic condensation water is removed from the inner tube portion 9a of the cylindrical basic substance 8.
It flows further toward the outer tube portion 9b. Further, the treatment tank 7 is provided with a dam 11, and the height of the dam 11 is made higher than the height of the bottom of the cylindrical basic material 8. It overflows and flows out more. Due to this flow, the acidic dew condensation water comes into contact with the cylindrical basic substance 8 and reacts with it, and is neutralized and drained.

Three processing tanks 7 in which cylindrical basic substances 8 are installed are provided in the body 12, and a sedimentation tank 13 is provided upstream of the processing tank 7. The acidic condensed water flowing in from the inlet 14 is led to the precipitation tank 13, where it precipitates insoluble foreign matter such as corrosion products of the heat exchanger and dust in the air. Acidic condensation water overflowing from the sedimentation tank flows into guide groove 1.
5 (see FIG. 3), and drops into the inner pipe portion 9a of the cylindrical basic substance 8 installed in the processing tank 7. The acidic condensed water that flows into the treatment tank 7 from the inner pipe part 9a stays until it reaches the height of the dam 11.
After forming a flow from the inner tube part 9a of the cylindrical basic substance 8 to the outer tube part 9b and reacting, it overflows from the dam 11 and flows out, and the inner tube of the cylindrical basic substance placed in the next processing tank drip onto the area. Thereafter, by repeating this process, the acidic condensed water comes into contact with the cylindrical basic substance, reacts, is neutralized, and is discharged from the outlet 16.

The sedimentation tank 13 and a plurality of treatment tanks are arranged in a staggered manner in the vertical direction, and the arrangement is such that the acidic condensation water overflowing from the tank is guided to the inner tube of a cylindrical basic substance placed in the next treatment tank. That's what I do. In addition, a bypass channel 17 is provided to allow acidic condensation water to flow even if the passage between the sedimentation tank 13 and the treatment tank 7 or the passage between the treatment tanks becomes clogged. A drainage hole 18 was provided. Exhaust hole 18 is outlet 1
6 is the passage in case of clogging.

With the above configuration, (1) the acidic condensed water reliably comes into contact with the basic substance, and treated water with a constant acidity is always discharged. (2) When a cylindrical basic substance dissolves, its outer diameter decreases but its inner diameter increases, so there is little change in the contact area with acidic condensation water, less reduction in neutralization ability, and less excess base. There is no need to prepare a chemical substance, and the neutralization processing mechanism can also be made smaller. (3) The cylindrical basic substance is suspended from the processing tank by the protrusion, and the size of the processing tank is larger than the size of the simple basic substance, and a gap is provided between the two so that the acidic condensation water is formed into a cylindrical shape. Since the basic substance flows from the inner tube to the outer tube, insoluble foreign matter such as corrosion products of the heat exchanger and dust in the air will accumulate at the bottom of the treatment tank, preventing clogging of the flow path. Hard to happen. In the example, a settling tank is provided to ensure prevention of clogging due to insoluble foreign matter.

On the other hand, basic substances include metals such as Mg and Al, Na,
These are oxides, carbonates, and hydroxides of K, Li, Mg, Ca, etc., and these are used as a single component or multiple components.

The effects of the present invention were evaluated using a neutralization treatment mechanism using Mg.

The neutralization mechanism has a height of 123 mm, a width of 38 mm, and a thickness of 32 mm.
One processing tank is placed inside an acrylic resin case (thickness: 3 mm) with an outer diameter of φ
A cylindrical magnesium tube (Mg96%, Al3%, Zn1%) with a diameter of 20 mm, an inner diameter of 12 mm, a height of 90 mm, and a weight of 31 g was placed. The cylindrical magnesium is suspended at a height of 5 mm from the bottom of the processing tank due to the protrusion, and a rectangular shape is created by providing a gap between the processing tank and the cylindrical magnesium so that the gap between the two is 7 mm at maximum. was placed in a treatment tank.

The dam is located at a height of 22 mm from the bottom of the magnesium cylinder. Acidic condensation water flows into the inner tube of the cylindrical magnesium tube, forms a flow from the inner tube to the outer tube, reacts with magnesium, and then overflows from the dam and is discharged to the outside.

This neutralization treatment mechanism is attached to a gas water heater that has a latent heat recovery heat exchanger (with tin plated surface), and the acidic condensation water generated on the surface of the latent heat recovery heat exchanger is guided and neutralized. I processed it. The acidic dew water had a pH of 3.0, a water temperature of 30°C, and was flowing into the neutralization treatment mechanism at a flow rate of 60ml/h. Figure 5 shows the results of continuous use of a gas water heater outdoors. The acidic condensed water was neutralized stably for a long period of time, and was not discharged with high acidity. Also, Mg is 3000
Although 2.3g had dissolved over time, the surface area was almost the same as the initial one when visually compared. Furthermore, although insoluble foreign substances such as corrosion products of the heat exchanger and dust in the air were deposited at the bottom of the processing tank, these insoluble foreign substances did not cause clogging of the flow path.

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

(1) Acidic condensation water flows into the inner tube of the cylindrical basic material, flows to the outer tube, reacts with the cylindrical basic material, and then overflows from the dam of the treatment tank. , it is reliably neutralized by reacting with basic substances, and is not discharged with high acidity.

(2) Since it is a cylindrical basic substance, the rate of decrease in surface area where it reacts and dissolves with acidic condensed water is small, so there is little decrease in neutralization ability.

(3) A gap is provided between the cylindrical basic material and the treatment tank, and acidic condensation water flows from the inner tube to the outer tube of the cylindrical basic material, so corrosion products from the heat exchanger and air The channel is less likely to be clogged by insoluble foreign matter such as dust inside.

[Brief explanation of the drawing]

Figure 1 is a front cross-sectional view of a conventional neutralization treatment device;
The figure is a front sectional view showing a neutralization treatment device for acidic condensed water according to an embodiment of the present invention, and FIG.
4 is a sectional view taken along the line A', FIG. 4 is a cutaway perspective view taken along the line B--B' in FIG. 2, and FIG. 5 is a characteristic diagram of the device of the present invention. 7... Processing tank, 8... Cylindrical basic substance, 9a...
...Inner pipe part, 9b...Outer pipe part, 11...Weir.

Claims (1)

[Claims] 1 Acidic condensation in which a cylindrical basic substance is placed with a gap in a treatment tank having a dam, and acidic condensation water flows from the inner pipe part of the cylindrical basic material to the outer pipe part and overflows from the dam. Water neutralization treatment equipment.