JPS6220870B2 - - Google Patents

Description

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

In conventional water heaters that use the combustion heat of oil and gas, approximately 80% of the total combustion heat energy has been utilized through primary heat exchange, but from the perspective of energy conservation, secondary heat exchangers have been used. The plan is to improve utilization by approximately 10%. In the conventional case of only primary heat exchange, gases such as NOx and CO ₂ contained in the combustion air were released into the atmosphere and diffused.
By performing secondary heat exchange, the flue gas temperature drops significantly to about 50℃ to 60℃, which causes water vapor in the flue gas to condense and further NOx.
Gases such as carbon dioxide and CO ₂ dissolve to form acidic condensed water, which is discharged, causing harm such as melting the concrete directly below the outlet.

As a means to solve this problem, a mechanism as shown in FIGS. 1 and 2 has recently been used to carry out neutralization treatment with a basic substance. In these conventional methods, a basic substance is installed in a neutralization treatment tank, and acidic condensation water is sequentially poured into multiple tanks to perform neutralization. The idea was to perform the neutralization process by flowing a small amount of acidic condensation water into the neutralization process tank, allowing the water to remain in each neutralization process tank for a predetermined period of time. However, in these conventional examples, since the neutralization treatment tanks are arranged in series, a water mass is generated due to the surface tension of acidic condensation water at the dam outlet end of the neutralization treatment tank, and this water mass is When the balance between surface tension and self-weight is disrupted, it rapidly flows into the next tank, causing a chess-like flow, forming an intermittent flow in contrast to the steady flow of acidic condensation water, and preventing sufficient reaction time. Because the treated water flows without being maintained, there is a risk that the treated water will be discharged from the outlet with high acidity.

In the conventional example shown in FIGS. 1 and 2, a pellet-like basic substance 2 is installed in a neutralization tank 1a provided in the main body 1, and acidic condensation water is introduced from an acidic condensation water inlet 3. , the neutralization process is carried out in the neutralization tank of each stage while dripping sequentially from the upper stage to the lower stage, and the water is discharged from the treated water outlet 5, but the basic substance 2 is released during handling and transportation of the mechanism. In order to prevent the liquid from falling out of the neutralization tank 1a, an upper wall 6 is provided. Because the acid drips or flows directly down the upper wall to the next stage, there is a risk that the water will be discharged from the treated water outlet with high acidity because the specified neutralization treatment is not performed.

This tendency can be explained by the fact that in the case where a plurality of neutralization tanks are arranged in one stage at an angle, as in the example shown in FIG. Due to necessity, the upper wall 6
There was a great risk that acidic condensed water would flow down the drain. Furthermore, as shown in Fig. 2, each stage has a single neutralization tank, and even if the upper wall 6 is horizontal, it may be tilted instead of horizontal when the mechanism is installed or applied products are installed. When the upper wall is tilted, the same problem as the above-mentioned sloped upper wall may occur.

The present invention solves the above-mentioned problems and reliably neutralizes acidic dew water. An embodiment of the invention is shown in FIGS. 3 and 4. In the neutralization tank 1a for treating acidic condensation water, which is composed of multiple stages with each stage having a plurality or a single neutralization treatment tank, the acidic condensation water drips from the end of each stage to the next stage at the lower end of overflowing water. A tongue-shaped dripping portion 4 is formed and is opposed to the next stage water receiving portion 1b. FIG. 5 shows an enlarged view of the tongue-shaped dripping portion 4 shown in FIGS. 3 and 4, which is molded integrally with the neutralization tank. FIG. 6 shows an example in which a separate part 10 is attached as a tongue-shaped dripping portion according to an embodiment of the present invention. As the material of the separate part 10 constituting the tongue-shaped dripping part 4, a corrosion-resistant material such as a resin plate, fiber fabric, non-woven fabric, etc. can be fixedly attached by gluing, screwing, etc., and it can be integrally molded as shown in FIG. It has the same effect as that of

In other words, in the case of the acidic condensation water treatment mechanism having the tongue-shaped dripping part illustrated in Figs. Because there is acidic condensation dripping from the lower end of the tongue-shaped dripping part 4,
Since acidic condensation water does not flow along the upper wall 6 and therefore necessarily flows through a predetermined number of neutralization tanks, the neutralization process is performed as set in advance, ensuring reliable neutralization process. It has the effect of being able to do the following.

In the case of the device having the tongue-shaped dripping part 4, the dripping position can be precisely set, so that when dripping from the position shown in FIG. Because the water flows over the basic substances, the upstream side of the basic substances becomes stagnant water, which effectively reduces the effective volume of the neutralization tank and shortens the residence time, that is, the reaction time. Not only that, but as shown in Figure 7, as the basic substance gets wet to the top, a large water mass is generated due to surface tension, and when this loses its balance and collapses, it rapidly becomes like the aforementioned chess player. Because of the flow, the reaction time is shortened, and there is a risk that the untreated acidity may be discharged with high acidity. Since only the surface flow is shown by the arrows shown in Fig. 7, there is a risk that the neutralization treatment will be insufficient.However, according to the embodiment of the present invention shown in Fig. 8, the dropping position of the acidic condensed water Since the acidic condensation water can be made to flow from the tongue-shaped dripping part 4 in the upper stage to the upstream side of the pellet-like basic substance 2 in the next stage, the flow of acidic condensation water is directed to the pellet-like basic substance as shown by the arrow in Fig. 8. Since the acidic condensed water flows around the substance 2, there is no stagnation of the acidic condensed water, and the acidic condensed water in the neutralization tank is replaced according to the predetermined flow rate, so the predetermined neutralization processing time is secured. , it is possible to realize a reliable treatment mechanism for acidic condensation water. Furthermore, since the pellet-like basic substance is less wet, the water mass due to surface tension does not become large and the balance is disrupted, making it difficult to generate shogi-like water flow, making it possible to treat acidic condensation water reliably. This has the effect of making it possible to carry out the treatment, and can also contribute to the realization of a more reliable treatment mechanism for acidic condensed water.

[Brief explanation of the drawing]

1 and 2 are respectively sectional views of a conventional acidic condensation water treatment apparatus, FIGS. 3 and 4 are sectional views of an acidic condensation water treatment apparatus according to an embodiment of the present invention, and FIG. FIG. 6 is a sectional view showing an example of the tongue-shaped dripping part of the present invention, FIG. FIG. 8 is a sectional view showing an example in which the tongue-shaped dripping portion corresponds to the upstream side of the basic substance in the next stage. 1a...neutralization tank, 1b...water receiving part, 2...basic substance, 4...tongue-shaped dripping part.

Claims (1)

[Claims] 1. Acidic condensation by stacking multiple stages of neutralization tanks, forming a tongue-shaped dripping part at the lower end of the overflowing water tank, and facing the water receiving part of the next stage neutralization tank. Water treatment equipment. 2. The acidic condensation water treatment device according to claim 1, wherein the dripping water from the tongue-shaped dripping portion drips onto the upstream side of the basic substance installed in the next-stage neutralization tank.