JPS6220877B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for treating acidic condensation water generated when heat exchange is performed using a latent heat type heat exchanger installed in an oil water heater, a gas water heater, or the like.

In recent years, there has been a demand for combustion equipment such as oil water heaters and gas water heaters with excellent thermal efficiency from the perspective of energy conservation.
Combustion equipment has been developed that is equipped with a latent heat exchanger that recovers latent heat contained in combustion gas. However, when this latent heat type heat exchanger recovers the latent heat contained in the combustion gas, condensation water is formed on the surface of the latent heat type heat exchanger, and this condensation water contains CO ₂ and nitrogen oxides (NOx) in the combustion gas. dissolves and becomes acidic condensed water. If this acidic condensed water is discharged without being neutralized, problems such as corrosion of pipes and melting of concrete will occur, so a neutralization treatment device for chemically neutralizing it is required.

Conventionally, this type of acidic condensation water neutralization treatment apparatus has a flow path 1 in the main body 1 of the neutralization treatment apparatus, as shown in FIG.
5 are provided in several stages, and a neutralizing agent 14 made of a cylindrical basic substance is provided in series in a processing tank 9 in the form of a plurality of recesses provided in the flow path 15.

The acidic condensed water generated in the latent heat type heat exchanger (not shown) flows in from the inlet 2 of the main body 1 and is neutralized while successively contacting the neutralizing agent 14 provided in the processing tank 9 of the flow path 15. The water was treated with water and discharged from the outlet 3.

However, the apparatus for neutralizing acidic condensed water constructed in this manner has the following problems.

The first problem is that acidic condensation water droplets are generated at the ends of each treatment tank 9 due to the surface tension of the acidic condensation water, and when the balance between the surface tension of these water droplets and their own weight is disrupted, they flow into the next treatment tank 9. Therefore, since the acidic condensation water flows intermittently in contrast to the steady inflow of the acidic condensed water, the neutralization reaction is not sufficiently carried out and the acidic condensed water is discharged from the outlet 3 in a highly acidic state. In addition, to prevent the neutralizer 14 from coming off the treatment tank 9 during handling or transportation of the neutralization treatment equipment, the upper wall 31 is attached to each flow path 1.
5, the processing tank 9 of the lower flow path 15
There was a problem in that the acidic condensed water was not dripped correctly and dripped down the upper wall 31 into the treatment tank 9 on the way, or it ran down the upper wall 31 without being neutralized and was discharged from the outlet 3. .

The second problem is that the neutralizing agent 14 provided in the processing tank 9 comes into line contact with the bottom of the processing tank 9, and the main body 1
Since it is in surface contact with the side wall of the latent heat exchanger, there is a problem that if insoluble foreign matter such as corrosion products of the latent heat exchanger or dust in the air gets mixed in, clogging occurs and the neutralization ability decreases.

The third problem is that since the neutralizing agent 14 has a cylindrical shape, when it undergoes a neutralization reaction with acidic condensation water and dissolves, its surface area becomes small and its neutralizing ability decreases. Moreover, on the inflow side of the acidic condensed water, since the acidity of the acidic condensed water is strong, the neutralizing agent is consumed more quickly than on the outflow side. Furthermore, in order to neutralize acidic condensed water, the amount of neutralizing agent 14 and the neutralization reaction time are required depending on whether the acidity is strong or weak and the flow rate.
It becomes necessary to provide in advance a flow path 15 having an extra processing tank 9 at the lower stage corresponding to the consumption of the neutralizing agent 14, resulting in the problems of wasting the neutralizing agent 14 and making the main body 1 larger than necessary.

In the present invention, a treatment tank is constructed by providing an inlet for acidic condensation water below an outlet, and a basic substance is located above the inlet and disposed within the treatment tank to generate acidic condensation. The above conventional problems are solved by configuring a water treatment device.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 6.

Note that the same members as in the conventional example will be described with the same reference numerals.

In FIG. 1, reference numeral 1 denotes the main body of the apparatus for neutralizing acidic condensed water, which has an inlet 2 for acidic condensed water at the upper part and an outlet 3 at the lower part. Reference numeral 4 denotes a sedimentation tank located below the inlet 2 and provided between both side walls of the main body 1. The height of the front plate 5 constituting this sedimentation tank 4 is lower than that of the rear plate 6. The lower end of the front plate 5 extending downward is bent inward into a substantially L-shape. 7 is a shielding plate A provided between both side walls in the main body 1 as shown in FIG. 2, and this shielding plate A7 is approximately L.
It is shaped like a letter, and the end extends downward and is bent inward. Reference numeral 8 denotes a partition plate A that is located between both side walls of the main body 1 and provided on the shielding plate A7, and constitutes the upper processing tank 9A. Reference numeral 10 denotes a shielding plate B constituting the lower processing tank 11B, and like the shielding plate A7, it is provided between both side walls of the main body 1, and a partition plate B12 is provided on this shielding plate B10. 1
3 is the main body 1 facing the partition plate A8 and partition plate B12.
The partition plate C provided between both side walls of the partition plate C13 or the front plate 5 and the partition plate A8 or the partition plate B12 hold the neutralizing agent 14 made of a basic substance and also prevent acidic condensation water from being removed. It forms part of the flow path. The upper end of this partition plate C13 is connected to the partition plate A
8. It is provided higher than the partition plate B12. 1
Reference numeral 5 denotes a flow path for acidic condensed water, which is constituted by the shielding plate A7, the front plate 5, and the shielding plate A7 and the shielding plate B10. Reference numeral 16 denotes a protrusion provided at the acidic condensation water inlet 17, as shown in FIG. 3, for holding the neutralizing agent 14. Reference numeral 18 indicates an outlet for acidic condensed water formed on the partition plates A8 and B12. 19 is a bypass flow path formed between the main body 1 and the shielding plate A7 and the shielding plate B10, and 20 is a vent provided in the upper part of the main body 1, which prevents acidic condensation water from flowing through the flow path 15 and the processing tanks A9 and B11. In addition to making it easier to flow, it also serves as a passage for acidic condensed water if the outlet 3 becomes clogged.

Next, the operation of the acidic condensation water treatment apparatus of the present invention will be explained. First, when acidic condensation water containing corrosion products of the latent heat exchanger and dust in the air is supplied from the inlet 2, the corrosion products and dust are removed in the settling tank 4.
Acidic condensation water flows into the processing tank A9 from the inlet 17 via the flow path 15, and undergoes a neutralization reaction with the neutralization processing agent 14. When the processing tank A9 is filled with acidic condensed water, it overflows from the outlet 18, flows to the next processing tank A9, reacts with the neutralizing agent 14, and further flows into the lower processing tank B11 via the flow path 15. Lower processing tank B1
1 reacts with the neutralizing agent 14, and the neutralized condensed water is discharged to the outside of the main body 1 from the outlet 3 via the outlet 18.

In this way, even if corrosion products of the latent heat type heat exchanger or insoluble foreign matter in the air are contained in the acidic condensation water, they are removed in the settling tank 4, so that they do not block the flow path 15, and moreover, the inlet port 17 are provided below the outlet 18, so that the processing tank A9 and the processing tank B11
The acidic condensed water that has flowed into the main body 1 is sufficiently neutralized by the neutralizer 14, and can be discharged from the outlet 3 to the outside of the main body 1 as neutral condensed water.

Furthermore, even if corrosion products of the latent heat exchanger or insoluble foreign matter in the air flow out from the settling tank 4 into the flow path 15 and accumulate therein, a sufficient distance between the shielding plates A7 and B10 and the inlet port 17 is ensured. Therefore, there is no need to worry about blocking the introduction port 17.

FIG. 4 shows another embodiment in which a neutralizing agent 14 made of a basic substance is configured in a cylindrical shape. Even if the neutralizing agent 14 reacts with the neutralizing agent 14 and dissolves, the outer diameter decreases but the inner diameter increases, so that the change in the contact area with acidic condensation water is reduced.

Therefore, the reduction in the neutralizing ability of the neutralizing agent 14 is reduced, there is no need to provide an extra neutralizing agent 14, and the neutralization processing apparatus can be downsized.

Next, the effects of this embodiment will be explained using the neutralization processing apparatus shown in FIG.

The dimensions of the main body 1 of this neutralization treatment device are approximately
The main body 1 is 180 mm long, 57 mm wide, and 20 mm deep, and three treatment tanks A9, B11, and C21 each having a depth of 40 mm, a width of 22 mm, and a depth of 22 mm are installed vertically within the main body 1. The number of channels 15 provided in this main body 1 is approximately 6
Inlet port 17, shielding plate A7, and shielding plate B1
The distance from 0 is approximately 10 mm. In addition, the acidic condensation water inlet 17 is located in the treatment tanks A9, B11, and C21 provided below the outlet 18, and one cylindrical neutralizer 14 is disposed above each inlet 17. has been done. This neutralizer 14 contains Mg
96% by weight, 3% by weight Al, Zn
It is made of a 1% alloy by weight, and has a cylindrical shape with an outer diameter of 20 mm, an inner diameter of 12 mm, and a height of 22 mm. A latent heat type heat exchanger with a tin-plated surface was installed in the gas water heater, and the acidic condensation water obtained from the surface of the latent heat type heat exchanger was guided to this neutralization treatment device and neutralized. . From this latent heat type heat exchanger
Acidic condensed water of 60 ml/H was obtained at pH 3.0 and water temperature of 30°C. This acidic condensed water was flowed into the neutralization treatment equipment to be neutralized, and the characteristics of the condensed water obtained from the outlet 3 were It is shown in Figure 6.

As is clear from FIG. 6, acidic condensation water generated in the latent heat type heat exchanger can be neutralized stably for a long period of time.

Further, 2.3g of Mg contained in Neutralizer 14 had been dissolved after 3000 hours, but the surface area was almost the same as at the initial stage.

Furthermore, insoluble foreign matter such as corrosion products of the latent heat exchanger and dust in the air had accumulated in the inlet port 17, but since there was a sufficient distance between the shielding plate A7 and the inlet port 17, the insoluble foreign matter was removed. The inlet port 17 was not clogged with corrosion products.

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

1. By configuring the treatment tank by providing the acidic condensation water inlet below the outlet, and by providing the basic substance above the inlet, the acidic condensation water flowing into the treatment tank from the inlet will flow upward. A sufficient neutralization reaction takes place with the basic substance during the transfer to the base substance, and a sufficient distance is ensured between the bottom of the inlet and the basic substance, so corrosion products of the latent heat type heat exchanger are prevented. It is possible to prevent clogging of the inlet port due to insoluble foreign matter such as dirt and dust in the air.

2 The acidic condensation water that flows in from the inlet is sufficiently neutralized by the basic substance installed in the treatment tank, so there is no need to install an extra treatment tank or basic substance, making the neutralization treatment equipment more compact. It becomes possible to convert into

[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.
A cross-sectional view taken along line A', Figure 3 is B of Figure 1.
4 is a side sectional view of an acidic condensation water treatment device showing another embodiment of the present invention,
FIG. 5 is a side sectional view of an acidic condensation water treatment device showing still another embodiment of the present invention, and FIG. 6 is a diagram showing the neutralization characteristics of the acidic condensation water treatment device of this embodiment.
FIG. 7 is a side sectional view of a conventional acidic condensation water treatment apparatus. 9, 11, 21...processing tank, 14...neutralizing agent (basic substance), 17...inlet, 18...outlet.

Claims (1)

[Scope of Claims] 1. An acidic condensed water in which an inlet for acidic condensed water is provided below an outlet to form a treatment tank, and a basic substance is placed above the inlet and arranged in the treatment tank. Condensation water treatment equipment. 2. The acidic condensation water treatment device according to claim 1, wherein the basic substance has a cylindrical shape.