JPH09287726A - Drain neutralising device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend the range wherein drain reaches a neutralising agent group by a method wherein a drain container, the passage cross section of which is larger than that of a discharging passage, is provided, and the neutralising agent group is placed within the passage cross section of the container, and almost the whole surface on the upstream side is covered with an absorbent having absorbing property and water permeability. SOLUTION: A plurality of neutralising units 6 being constituted of a neutralising agent 4 and a water absorbent sheet 3a, are provided in a drain container 2, and they are continued in the vertical direction. Drain flows into the drain container 2 with a larger diameter than that of a discharging pipe 110. At this time, on the upstream side of the neutralising agent 4 in the drain container 2, the water absorbent sheet 3a which is excellent in absorbing property and water permeability, is placed so as to cover the almost whole surface, and the flowed in drain is absorbed by this water absorbent sheet 3a. Then, in the water absorbent sheet 3a, the drain disperses to the outer periphery side in the passage cross section of the drain container 2. Therefore, by this dispersing, the drain flows out from the almost whole area of the surface of the water absorbent sheet 3a on the downstream side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain neutralizing device, and more particularly to a drain neutralizing device for neutralizing drain produced by condensation of steam in combustion exhaust.

[0002]

2. Description of the Related Art FIG. 6 is a heat exchange device in the prior art.
It is an explanatory view of the drain neutralization device (1a) of (1). As shown in the figure, the heat exchange device (1) has a main heat exchanger (1
2) and the auxiliary heat exchanger (13) are housed. In this heat exchange device (1), the combustion exhaust gas from the burner (14) is absorbed by the main / sub heat exchangers (12) and (13) until the temperature falls below the dew point. Therefore, the heat exchange efficiency of the heat exchange device (1) is high.

In the can body (10), the heat absorption causes water vapor in the combustion exhaust gas to condense and become drain. This drain is the first discharge pipe (110) extending downward from the bottom of the can body (10).
Through the heat exchange device (1). An acidic component such as nitrogen oxide contained in the combustion exhaust is dissolved in the drain, but the first discharge pipe (110) has a drain neutralization device (1a) for neutralizing the drain. Is provided.

This conventional drain neutralization device (1a) is a drain container (2) formed in a cylindrical body in a substantially vertical posture, and a drain container (2) for accommodating and neutralizing the drain. The neutralizing agent (4) (4) group. The drain container (2) has a passage cross-sectional area larger than that of the first discharge pipe (110), and the neutralizing agents (4) and (4) group are inside the passage cross-section of the drain container (2). It is filled with and is filled up and down.

In this case, the first discharge pipe (1
The drain discharged to (10) comes into contact with the neutralizing agents (4) and (4) groups when passing through the drain container (2). By this contact, the acidic component (for example, pH 3) of the drain is neutralized. The drainage after the neutralization is discharged to a waste water groove (not shown) through the second discharge pipe (120) connected to the bottom of the drain container (2).

[0006]

However, in this prior art, since the drain passes through the inner peripheral portion in the passage cross section of the drain container (2), the neutralization in the outer peripheral portion in the passage cross section is performed. Drain does not easily reach the agents (4) and (4). That is, in the drain container (2), the neutralizing agent (4) (4) that does not contribute to the neutralization
Therefore, the neutralizing agents (4) and (4) cannot be used efficiently.

It is an object of the inventions of claims 1 and 4 to enable the neutralizing agents (4) and (4) to be used efficiently in the drain neutralization apparatus.

[0008]

According to a first aspect of the present invention, there is provided a device for neutralizing a drain produced by condensation of steam in combustion exhaust gas, the drain discharge path (11). And a drain container (2) having a passage cross-sectional area larger than that of the discharge path (11), and the drain container (2).
Neutralizing agents (4) and (4), which are accommodated so as to be filled in the passage cross section of (2) and neutralize the drain, and the neutralizing agent.
(4) A water-absorbing member (3) which covers the substantially entire surface of the upstream side of the group (4) and has water absorbability and water permeability.

The drain container (2) has a cross sectional area larger than that of the discharge passage (11),
A water absorbing member (3) having water absorbability and water permeability is provided on substantially the entire upstream side of the neutralizing agent (4) (4) stored so as to be filled in the passage cross section of the drain container (2). It is covered.
Therefore, the drain flowing into the drain container (2) first reaches the water absorbing member (3) and is absorbed. By this water absorption, the drain is dispersed even in a portion in the cross section of the passage, which is apart from the reaching point to the water absorbing member (3). Then, since the water absorbing member (3) has water permeability, the dispersed drain flows out from the water absorbing member (3). After that, the neutralizing agents (4) and (4) reach and come into contact with each other, whereby they are neutralized and discharged to the downstream side of the drain container (2).

Here, as in the invention of claim 2, a plurality of neutralizing units (6) comprising the group of the neutralizing agents (4) and (4) and the water absorbing member (3) are provided. Neutralization unit
(6) (6) Mutually continuous '', the plurality of neutralization units (6), (6) water absorbing member (3) (3), the drain dispersion to the outer peripheral side in the passage cross-section is multiple. Since it is performed in stages, the degree of the drain dispersion is further increased.

Further, as in the invention of claim 3, in the case where "the water absorbing member (3) is formed in a sheet shape", the size of the water absorbing member (3) in the drain passage direction is small. Become. According to a fourth aspect of the present invention, there is provided a device for neutralizing a drain produced by condensation of steam in combustion exhaust gas, the device being provided in a drain discharge path (11) and having a passage cross-sectional area of the drain. A drain container (2) larger than the cross-sectional area of the discharge path (11), and a neutralizing agent (4) for filling the drain container (2) so as to fill the passage cross section and for neutralizing the drain. Group (4) and a neutralizing agent (4) and a perforated plate which covers substantially the entire upstream side of the group (4) and has a plurality of through holes ".

In this structure, when the drain flowing into the drain container (2) from the discharge passage (11) reaches the perforated plate, the drain permeates along the perforated plate in the cross section of the passage. It is dispersed in the part away from the point of reaching the plate.
Then, in this dispersion process, the drain passes to the downstream side through a plurality of through holes of the perforated plate, the neutralizing agent (4)
(4) Reach the group. And the drain is the neutralizing agent
(4) It is contacted with the group (4), neutralized, and discharged to the downstream side of the drain container (2).

[0013]

According to the invention of claim 1, the neutralization container (2)
The drain flowing into the neutralization vessel (2) is dispersed in the cross section of the passage, and the dispersed drain is the neutralizing agent (4) (4).
Since it reaches the group, the range covered by the drain becomes large with respect to the group of the neutralizing agents (4) and (4). Therefore, the neutralizing agent (4)
(4) Use efficiency of the group is improved.

According to the second aspect of the present invention, since the degree of the drain dispersion is further increased, the range of the drain with respect to the neutralizing agents (4) and (4) is further increased, and the neutralizing agent (4) is increased. (Four)
The use efficiency of is further improved. In the invention of claim 3,
Since the size of the water absorbing member (3) in the drain passage direction becomes small, the drain container (2) accommodating the water absorbing member (3) can be downsized.

Also in the invention of claim 4, as in the case of the above-mentioned invention of claim 1, the range of the drain is larger than that of the neutralizing agents (4) and (4) groups, and the neutralizing agent (4) (4) Use efficiency of the group is improved.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. [Embodiment 1] FIG. 1 is an explanatory diagram of a drain neutralization device (1a) of a heat exchange device (1) according to Embodiment 1 of the present invention. FIG. 2 is a II-II sectional view of the drain neutralization device (1a) of FIG.

* Heat Exchanger (1) * As shown in the figure, the heat exchanger (1) comprises a burner (14) in the can body (10) and main / sub heat exchangers located below it. (12) (1
3), and a burner (14) at the top of the can body (10).
A fan (15) for supplying combustion air is connected in series. The main heat exchanger (12) is the sub heat exchanger (13)
The water passage pipe of the main heat exchanger (12) is located closer to the burner (14) than the water passage pipe of the sub heat exchanger (13). Therefore, the combustion exhaust gas from the burner (14) first passes through the main heat exchanger (12). At this time, sensible heat is absorbed from the combustion exhaust gas by the main heat exchanger (12). After that, when passing through the sub heat exchanger (13), the sub heat exchanger (13)
The latent heat is absorbed from the combustion exhaust gas. By this latent heat absorption, the combustion exhaust gas is cooled to a temperature below the dew point, and drain is generated mainly in the sub heat exchanger (13). This drain has
Acidic corrosive components such as nitrogen oxides contained in the combustion exhaust are dissolved.

Further, the can body (10) has a gas supply path (14a) for supplying gas to the burner (14) and an exhaust passage (16) for discharging the combustion exhaust gas after the latent heat absorption. ), And are connected. Further, the bottom wall portion of the can body (10) is formed in a funnel shape, and the lower end portion thereof has a first discharge pipe (110) extending downward.
Is connected. A drain neutralization device (1a) described later is connected to the downstream side of the first discharge pipe (110), and a second discharge pipe (120) is further provided downstream of the drain neutralization device (1a). It is connected.

* Drain neutralizer (1a) * The drain neutralizer (1a) is formed in a cylindrical body with both ends closed in a substantially vertical posture, and with respect to the first and second discharge pipes (110) (120). Drain container (2) arranged substantially concentrically and this drain container
(2) Neutralizing agent (4) (4) group contained in this, and this neutralizing agent (4)
(4) The water absorbing sheet (3a) provided on the upstream side of the group.

The inside of the drain container (2) communicates with the first and second discharge pipes (110) and (120), and the inner diameter of the drain container (2) is the first and second discharge pipes (110). ) It is set larger than the inner diameter of (120). As a result, the cross-sectional area of the passage of the drain container (2) is larger than the cross-sectional area of the first and second discharge pipes (110) (120). The first and second discharge pipes (110) (120) are the discharge route (11) described in claim 1.

The neutralizing agents (4) and (4) are granular materials such as magnesium oxide and calcium carbonate. And a neutralizer (4) (4)
Are accommodated in the drain container (2) so as to be filled in the passage cross section and have a constant width in the vertical direction. Water absorbent sheet
(3a) is made of cotton cloth and has a circular shape with a diameter slightly smaller than the inner diameter of the drain container (2). This water absorbing sheet (3a) is the water absorbing member (3) according to claim 1 above.

The neutralizing unit (6) according to claim 2 is composed of the group of neutralizing agents (4) and (4) and the water absorbing sheet (3a). A plurality of the neutralization units (6) are provided vertically in the drain container (2), and the plurality of neutralization units (6) (6) are provided.
Mutually continuous in the vertical direction. In this one, the can body
The drain discharged from the (10) to the first discharge pipe (110) flows into the drain container (2) having a diameter larger than that of the first discharge pipe (110). At this time, on the upstream side of the neutralizing agent (4) (4) group in the drain container (2), cover almost the entire surface of the neutralizing agent (4) (4) group,
Since the water absorbent sheet (3a) made of a cotton cloth rich in water absorption and water permeability is covered, the inflow drain is
Water is absorbed by a). And, the drain is a water absorbing sheet (3
In a), it is dispersed on the outer peripheral side in the passage cross section of the drain container (2). Due to this dispersion, the drain is a water absorbing sheet.
It flows out from almost the entire downstream surface of (3a). This drained drain reaches the neutralizing agents (4) and (4) group and is neutralized by contact with the neutralizing agents (4) and (4) group.

In this case, the water absorbing sheet (3a)
Since the drain is dispersed on the outer peripheral side of the passage cross section and spreads over almost the entire water absorbing sheet (3a), the range of the drain is widened with respect to the neutralizing agents (4) and (4) groups, and the neutralization is performed. Agent (4) (4)
Use efficiency of the group is improved. Further, the drain container (2), that is, the drain neutralization device (1a) is downsized by the amount that the use efficiency is improved.

In this case, since a plurality of neutralizing units (6) consisting of the neutralizing agents (4) and (4) groups and the water absorbing sheet (3a) are provided in the vertical direction, they flow into the drain container (2). The drained water reaches the uppermost water-absorbing sheet (3a) and is dispersed as described above, and after passing through the neutralizing agents (4) and (4) group thereunder, reaches the next water-absorbing sheet (3a). Further dispersed, neutralizing agent underneath (4)
(4) Pass the group. In this way, since the dispersion is performed in a plurality of stages, the drain is reliably dispersed on the outer peripheral side in the passage cross section.

Further, the drainage neutralized by passing through the drain container (2) is discharged from the drain container (2) to the second discharge pipe (120). In this case, since the water absorbing sheets (3a) (3a) have a small thickness in the vertical direction, the drain container (2) accommodating the water absorbing sheets (3a) (3a) can be downsized. [Second Embodiment] FIG. 3 shows a heat exchange device according to a second embodiment.
FIG. 3 is a cross-sectional view of the drain neutralization device (1a) of (1).

Drain neutralization device (1a) of the second embodiment
As shown in the figure, the first exhaust pipe (110) provided in the heat exchange device (1) (not shown) is the same as that of the first embodiment.
Storage container (5) for storing drainage from
Drain container containing siphon (7) for discharging drain from (5) and neutralizing agent (4) and (4) similar to those in the first embodiment.
(2), and an auxiliary container (8) for temporarily storing the neutralized drain discharged from the drain container (2), and then discharging the drain.
Consists of

A water sealing chamber (51) in which the first discharge pipe (110) is inserted from above into the storage container (5), and this water sealing chamber (51)
A storage chamber (52) that stores drainage that overflows from the
Is provided. The siphon (7) has a vacant chamber (71) communicating with the lower end of the storage chamber (52) through a communication hole (71a),
Drain discharge pipe (72) installed vertically in this empty chamber (71)
And consisting of Then, between the drain discharge pipe (72) (for example, a diameter of 6 mm) and the top plate (73) of the vacant chamber (71), the diameter of the drain discharge pipe (72), the surface tension of the drain, and the rise of the drain water level are increased. In consideration of speed, a gap (for example, 5 mm) is provided below the top plate (73) to the extent that air is not accumulated when the water level rises. The top plate (73) is provided slightly lower than the overflow water level from the water sealing chamber (51).

The drain container (2) includes a storage chamber (52) and an empty chamber (7
It is provided below 1) and to the side of the lower half of the water seal chamber (51). The bottom wall (21) of the drain container (2) is formed in a funnel shape, and the lower end apex of the bottom wall (21) is provided at a position biased to the water sealing chamber (51) side. A hole portion (22) that connects the inside of the drain container (2) and the inside of the auxiliary container (8) is provided at the top of the lower end. Neutralizer contained in this drain container (2)
(4) A water absorbing sheet (3a) made of cotton cloth similar to that of the first embodiment is provided on (4) so as to cover almost the entire surface thereof.

The auxiliary container (8) has a second discharge pipe (1) that penetrates through the bottom wall of the auxiliary container (8) and projects upward, and extends downward from the bottom wall.
20) are provided. In this one, heat exchange equipment (1)
The drain discharged from the can body (10) (not shown) of the
It flows into the sealed water chamber (51) through the discharge pipe (110). And
The drain overflowing from the water sealing chamber (51) is stored in the storage chamber (52), and the water level of the drain in the storage chamber (52) rises. At this time, the water level of the empty chamber (71) communicated with the storage chamber (52) also rises.

When the water level of the drain in the vacant chamber (71) exceeds the upper end of the drain discharge pipe (72), the upper end and the top plate are
It is interposed between (73) due to surface tension without air traps. As a result, the upper end opening of the drain discharge pipe (72) is closed by the drain (state shown in FIG. 3). This closing action is
It slightly precedes the rise in the drain water level in the storage chamber (52).
After that, when the drain water level of the storage chamber (52) reaches the same height as the top plate (73), the pressure in the empty chamber (71) reaches a predetermined pressure and the drain discharge pipe (72) is closed. Torn. This makes the vacancy
The drain in (71) flows into the drain discharge pipe (72), and the suction negative pressure causes the drain in the empty chamber (71) and the storage chamber (52) to flow into the drain discharge pipe (72), and the drain container (2) It flows out. Then, when the drain water level coincides with the communication hole (71a), air is introduced into the chamber (71), the suction negative pressure disappears, and drain discharge is completed.

In this way, a certain amount of drain flows into the drain container (2). At this time, the cross-sectional area of the drain discharge pipe (72) is significantly smaller than the cross-sectional area of the passage of the drain container (2), and the lower end opening of the drain discharge pipe (72) is the sealing chamber in the drain container (2). Although facing the end on the opposite side of (51), since there is a water absorption sheet (3a), the drain that has flowed into the drain container (2) is absorbed by the water absorption sheet (3a) and is sealed in the water seal chamber ( It is also dispersed on the 51) side and spreads over the entire water absorbing sheet (3a).
Therefore, the drain, by passing through the water absorbent sheet (3a), comes into contact with almost all of the neutralizing agents (4) and (4) groups,
Use efficiency of the neutralizing agents (4) and (4) group is improved.

The drain is neutralized by contact with the neutralizing agents (4) and (4) group, and then flows out into the auxiliary container (8) through the hole (22). 8) After being temporarily stored inside, it flows into the inside of the second discharge pipe (120) by overflow, and is discharged to a wastewater groove (not shown) etc. via this second discharge pipe (120). To be done. In this one, the first discharge pipe (110)
, Storage container (5), siphon (7), second discharge pipe (120)
Corresponds to the discharge route (11) described in claim 1. [Other embodiments]. The water absorbing member (3) described above is not limited to the above-mentioned cotton cloth member. For example, a sponge having open cells or a porous material having water permeability (for example, ceramics) may be used.
Further, the water absorbing member (3) is not limited to the above-mentioned sheet-shaped member. For example, it may be block-shaped.

.. The drain neutralization device according to the above-described first embodiment
Instead of the water absorbing member (3) of (1a), as shown in FIGS. 4 and 5, a circular perforated plate (33) having a plurality of through holes (34) (34) may be used. In the figure, at the peripheral edge of each of the through holes (34) and (34) in the perforated plate (33), an annular portion (35) (projecting toward the upstream side in the drain container (2) ( 35) is provided.

In this case, after the drain flowing into the drain container (2) reaches the inner peripheral portion of the perforated plate (33), the drain flows along the perforated plate (33) to the outer peripheral side thereof and is dispersed. To be done. Then, in the process of this dispersion, it flows to the downstream side through the through holes (34) (34). Thereby, the drain is a neutralizing agent (4) (4)
Reach the flock. Therefore, as in the first and second embodiments, the reach of the drain in the neutralizing agents (4) and (4) group is increased, and the use efficiency of the neutralizing agents (4) and (4) is improved.

Further, since the drain is not absorbed by the perforated plate (33), it is easier to set the drain passing speed to be higher than that of the one using the water absorbing member (3). Therefore, when the flow rate of drain flowing into the drain container (2) is large, this porous plate (3
Those using 3) are effective. In this one, perforated plate (3
When the water level of the drain on the surface of 3) becomes higher than the edge of the annular portion (35) (35), the drain flows into the through holes (34) (34), but the annular portion (35) (35). Therefore, the drain easily flows to the outer peripheral side through between the annular portions (35) and (35). Therefore,
The above-mentioned drain dispersion is sure.

Even if the through holes (34) and (34) of the perforated plate (33) are arranged such that the flow rate of passage therethrough increases toward the outer peripheral side of the perforated plate (33), the drain will still form on the outer peripheral side. It becomes easy to flow to. Specifically, the drain passage area, which is represented by the number of the through holes (34) and (34) and the diameter, is increased toward the outer peripheral side. . The drain container (2) does not have to pass the drain downward. For example, the configuration of the invention of the present application can be adopted even in the case of allowing the drain to pass in a substantially horizontal direction, and the same operation / effect can be obtained. Alternatively, it may pass upward using a pump or the like.

.. The drain neutralization device (1a) of the present invention may be used for devices other than the heat exchange device (1) as long as the drain neutralization device (1a) neutralizes the drain generated by the condensation of the steam in the combustion exhaust gas.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a drain neutralization device (1a) of a heat exchange device (1) according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view taken along the line II-II of the drain neutralization device (1a) of FIG.

FIG. 3 is a cross-sectional view of the drain neutralization device (1a) of the heat exchange device (1) of the second embodiment.

FIG. 4 is a sectional view of a drain neutralization device (1a) according to another embodiment.

5 is a sectional view of the perforated plate (33) of the drain neutralization device (1a) of FIG.

FIG. 6 is an explanatory view of the drain neutralization device (1a) of the heat exchange device (1) in the conventional technique.

[Explanation of symbols]

 (11) ・ ・ ・ Discharge route (2) ・ ・ ・ Drain container (4) ・ ・ ・ Neutralizer (3) ・ ・ ・ Water absorbing member (6) ・ ・ ・ Neutralization unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuko Fujimine 2-26 Fukuzumicho, Nakagawa-ku, Nagoya City Rinnai Corporation

Claims (4)

[Claims] 1. A device for neutralizing drain produced by condensation of water vapor in combustion exhaust gas, the device being provided in a drain discharge path (11) and having a passage cross-sectional area of the discharge path (11).
A drain container (2) larger than the cross-sectional area of the drain container, and a group of neutralizing agents (4) (4) that are stored so as to be filled in the cross section of the passage of the drain container (2) and neutralize the drain. , The neutralizing agent
(4) A drain neutralization device comprising: a water absorbing member (3) which covers substantially the entire upstream side of the group (4) and has water absorbability and water permeability. 2. The neutralizing agent (4) (4) group and the water absorbing member (3)
The drain neutralization device according to claim 1, wherein a plurality of neutralization units (6) each consisting of and are provided, and the plurality of neutralization units (6) and (6) are continuous with each other. 3. The drain neutralization device according to claim 1, wherein the water absorbing member (3) is formed in a sheet shape. 4. A device for neutralizing drain produced by condensation of water vapor in combustion exhaust, the device being provided in a drain discharge path (11) and having a passage cross-sectional area of the discharge path (11).
A drain container (2) larger than the cross-sectional area of the drain container, and a group of neutralizing agents (4) (4) that are stored so as to be filled in the cross section of the passage of the drain container (2) and neutralize the drain. , The neutralizing agent
(4) A drain neutralization device, comprising: a perforated plate which covers substantially the entire upstream side of the group (4) and has a plurality of through holes arranged in parallel toward the outer peripheral side.