JP3732887B2 - Drain neutralizer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drain neutralizer, and more particularly to a drain neutralizer that neutralizes drain generated by condensation of water vapor in combustion exhaust.
[0002]
[Prior art]
FIG. 6 is an explanatory view of a drain neutralization device (1a) of a heat exchange device (1) in the prior art.
As shown in the figure, the heat exchange device (1) has a configuration in which a main heat exchanger (12) and a sub heat exchanger (13) are accommodated in a can body (10). In this heat exchange device (1), the main and auxiliary heat exchangers (12) and (13) absorb the heat until the combustion exhaust from the burner (14) falls below the dew point. Therefore, the heat exchange efficiency of the heat exchange device (1) is high.
[0003]
In the can (10), due to the heat absorption, the water vapor in the combustion exhaust is condensed to become drain. This drain is discharged from the heat exchange device (1) through the first discharge pipe (110) extending downward from the bottom of the can (10).
The drain contains an acidic component such as nitrogen oxide contained in the combustion exhaust gas. The drain neutralizer (1a) for neutralizing the drain is disposed in the first exhaust pipe (110). Is provided.
[0004]
This conventional drain neutralizer (1a) includes a drain container (2) formed in a substantially vertical cylinder, and a neutralizing agent contained in the drain container (2) and neutralizing the drain. (4) and (4) group. The drain container (2) has a configuration in which the cross-sectional area of the passage is larger than the cross-sectional area of the first discharge pipe (110), and the group of neutralizing agents (4) and (4) And is filled up and down.
[0005]
In this case, the drain discharged from the can body (10) into the first discharge pipe (110) comes into contact with the group of neutralizing agents (4) and (4) when passing through the drain container (2). By this contact, the acidic component (for example, pH 3) of the drain is neutralized. The neutralized drain is discarded into a waste water ditch (not shown) through a second discharge pipe (120) connected to the bottom of the drain container (2).
[0006]
[Problems to be solved by the invention]
However, in this conventional technique, since the drain passes through the inner peripheral portion in the cross section of the drain container (2), the neutralizer (4) (4) in the outer peripheral portion in the cross section of the passage Difficult to drain. That is, the drain container (2) has a neutralizing agent (4) (4) that does not contribute to the neutralization, and the neutralizing agent (4) (4) cannot be used efficiently.
[0007]
An object of the present invention is to enable efficient use of the neutralizing agents (4) and (4) in the drain neutralizer.
[0011]
[Means for Solving the Problems]
The problem-solving means of the present invention is `` an apparatus for neutralizing drain generated by condensation of water vapor in combustion exhaust gas, provided in the drain discharge path (11) and having a passage cross-sectional area of the discharge path ( A drain container (2) larger than the cross-sectional area of 11), and a neutralizing agent (4) (4) accommodated so as to be filled in the passage cross section of the drain container (2) and neutralizing the drain And a perforated plate that covers the substantially entire upstream surface of the neutralizing agent (4) and (4) group and has a plurality of through holes ”.
[0012]
In this case, when the drain that has flowed into the drain container (2) from the discharge path (11) reaches the perforated plate, it passes along the perforated plate to the perforated plate in the cross section of the passage. It is distributed in the part away from the arrival point. In this dispersion process, the drain passes downstream through the plurality of through holes of the perforated plate and reaches the group of neutralizing agents (4) and (4). The drain is neutralized by contact with the neutralizers (4) and (4) and discharged to the downstream side of the drain container (2).
Further, since the drain is not absorbed by the porous plate (33), it is easy to set the drain passage speed larger than that using the water absorbing member (3). Therefore, when the flow rate of the drain flowing into the drain container (2) is large, the one using the perforated plate (33) is effective. In this case, when the water level of the drain on the surface of the porous plate (33) becomes higher than the edge of the annular portion (35) (35), the drain flows into the through hole (34) (34), Since there are the portions (35) and (35), the drain easily flows to the outer peripheral side through the annular portions (35) and (35). Therefore, the above-described drain dispersion is reliable.
[0013]
【The invention's effect】
In the present invention, the drain that has flowed into the neutralization vessel (2) is dispersed in the passage cross section of the neutralization vessel (2), and the dispersed drain is the group of neutralizing agents (4) and (4). Therefore, the range covered by the drain becomes larger with respect to the group of neutralizing agents (4) and (4). Therefore, the use efficiency of the neutralizers (4) and (4) is improved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Reference Example 1]
FIG. 1 is an explanatory diagram of a drain neutralization device (1a) of a heat exchange device (1) of Reference Example 1. 2 is a cross-sectional view of the drain neutralizer (1a) of FIG. 1 taken along the line II-II.
[0017]
* Heat exchanger (1) *
As shown in the figure, the heat exchanging device (1) has a can (10) with a burner (14) and main / sub heat exchangers (12) and (13) located therebelow. In addition, a fan (15) for supplying combustion air to the burner (14) is connected to the upper end of the can (10). The main heat exchanger (12) is closer to the burner (14) than the sub heat exchanger (13), and the water pipe of the main heat exchanger (12) is the water pipe of the sub heat exchanger (13). It is connected to the downstream side. Accordingly, the combustion exhaust 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). Thereafter, when passing through the auxiliary heat exchanger (13), latent heat is absorbed from the combustion exhaust gas by the auxiliary heat exchanger (13). By this latent heat absorption, the combustion exhaust gas is cooled below the dew point, and drainage is mainly generated in the auxiliary heat exchanger (13). Acidic corrosive components such as nitrogen oxides contained in the combustion exhaust gas are dissolved in the drain.
[0018]
The can body (10) includes a gas supply path (14a) for supplying gas to the burner (14), an exhaust passage (16) for discharging the combustion exhaust after absorption of latent heat to the outside, Is connected.
Further, the bottom wall portion of the can body (10) is formed in a funnel shape, and a first discharge pipe (110) extending downward is connected to the lower end portion thereof. A drain neutralizer (1a) described later is connected to the downstream side of the first discharge pipe (110), and a second discharge pipe (120) is connected to the downstream side of the drain neutralizer (1a). It is connected.
[0019]
* Drain neutralizer (1a) *
The drain neutralizer (1a) is a drain container (2) formed in a cylindrical body with both ends closed in a substantially vertical posture and arranged substantially concentrically with respect to the first and second discharge pipes (110) (120). A neutralizer (4) (4) group accommodated in the drain container (2), a water absorbent sheet (3a) provided upstream of the neutralizer (4) (4) group, Consists of.
[0020]
The inside of the drain container (2) communicates with the first and second discharge pipes (110) and (120). The inner diameter of the drain container (2) is the first and second discharge pipes (110) and (120). ) Is set larger than the inner diameter. Thereby, the passage sectional area of the drain container (2) is larger than the sectional areas of the first and second discharge pipes (110) and (120). The first and second discharge pipes (110) and (120) are the discharge path (11) according to claim 1 described above.
[0021]
The neutralizing agents (4) and (4) are granular materials such as magnesium oxide and calcium carbonate. The neutralizing agents (4) and (4) are accommodated in a constant width in the vertical direction so as to be filled in the cross section of the drain container (2). The water absorbent sheet (3a) is made of cotton cloth and has a circular shape whose diameter is slightly smaller than the inner diameter of the drain container (2).
[0022]
A neutralizing unit (6) is composed of the group of neutralizing agents (4) and (4) and the water absorbing sheet (3a). A plurality of neutralization units (6) are provided in the vertical direction in the drain container (2), and the plurality of neutralization units (6) and (6) are continuous in the vertical direction. In this case, the drain discharged from the can body (10) into the first discharge pipe (110) flows into the drain container (2) having a larger diameter than the first discharge pipe (110). At this time, on the upstream side of the neutralizing agent (4) (4) group in the drain container (2), water absorption and water permeability are performed so as to cover almost the entire surface of the neutralizing agent (4) (4) group. Since the water-absorbing sheet (3a) made of cotton is covered, the inflowing drain is absorbed by the water-absorbing sheet (3a). The drain is dispersed on the outer peripheral side in the cross section of the drain container (2) in the water absorbing sheet (3a). Due to this dispersion, the drain flows out from substantially the entire area of the downstream surface of the water absorbent sheet (3a). This drained drain reaches the group of neutralizers (4) and (4) and is neutralized by contact with the group of neutralizers (4) and (4).
[0023]
In this case, the drain is dispersed by the water absorbent sheet (3a) on the outer peripheral side of the passage cross section and reaches almost the entire water absorbent sheet (3a). The range covered by the drain is widened, and the use efficiency of the neutralizers (4) and (4) is improved. In addition, the drain container (2), that is, the drain neutralizer (1a) is reduced in size by the increase in the use efficiency.
[0024]
In this device, a plurality of neutralizing units (6) composed of a group of neutralizing agents (4) (4) and a water absorbing sheet (3a) are provided in the vertical direction, so that the drain that has flowed into the drain container (2) It reaches the uppermost water-absorbing sheet (3a) and is dispersed as described above, and after passing through the group of neutralizers (4) and (4) below it, it reaches the next water-absorbing sheet (3a) and is further dispersed. Pass the group of neutralizers (4) and (4) below. Thus, since the said dispersion | distribution is performed in multiple steps, the said drain is reliably disperse | distributed to the outer peripheral side in the said channel | path cross section.
[0025]
Further, the neutralized drain passing through the drain container (2) flows out from the drain container (2) to the second discharge pipe (120). In this case, since the vertical thickness of the water absorbent sheets (3a) (3a) is small, the drain container (2) for accommodating these water absorbent sheets (3a) (3a) can be downsized.
[Reference Example 2]
FIG. 3 is a cross-sectional view of the drain neutralizer (1a) of the heat exchange device (1) of Reference Example 2.
[0026]
As shown in the figure, the drain neutralization device (1a) of the reference example 2 has a first discharge pipe (110) similar to the reference example 1 provided in the heat exchange device (1) (not shown). A drain container containing a storage container (5) for storing drainage from the tank, a siphon (7) for discharging drainage from the storage container (5), and a neutralizing agent (4) (4) similar to those in Reference Example 1 above (2) and an auxiliary container (8) for discharging the neutralized drain discharged from the drain container (2) after temporarily storing it.
[0027]
The storage container (5) includes a sealed water chamber (51) in which the first discharge pipe (110) is inserted from above, and a storage chamber (52) for storing drain overflowed from the sealed water chamber (51). , Is provided.
The siphon (7) includes a vacant chamber (71) communicating with the lower end of the storage chamber (52) via the communication hole (71a), and a drain discharge pipe (vertical direction) provided in the vacant chamber (71) ( 72). Between the drain discharge pipe (72) (for example, 6 mm in diameter) and the top plate (73) of the empty room (71), the diameter of the drain discharge pipe (72), the surface tension of the drain, and the water level rise of the drain Considering the speed, a gap (for example, 5 mm) is provided below the top plate 73 when the water level rises so as not to cause air accumulation. The top plate (73) is provided slightly lower than the overflow water level from the sealed water chamber (51).
[0028]
The drain container (2) is provided below the storage chamber (52) and the empty chamber (71) and on the side of the lower half of the sealed water chamber (51). The bottom wall (21) of the drain container (2) is formed in a funnel shape, and the lower end top portion of the bottom wall (21) is provided at a position biased toward the sealed chamber (51). A hole (22) for communicating the inside of the drain container (2) and the inside of the auxiliary container (8) is provided at the top of the lower end. On the neutralizing agent (4) (4) accommodated in the drain container (2), a water absorbent sheet (3a) made of cotton similar to that of the first embodiment is provided so as to cover almost the entire surface thereof. It has been.
[0029]
The auxiliary container (8) is provided with a second discharge pipe (120) that protrudes upward through the bottom wall and extends downward from the bottom wall.
In this case, the drain discharged from the can (10) (not shown) of the heat exchange device (1) flows into the sealed water chamber (51) through the first discharge pipe (110). The drain overflowing from the sealed water 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 room (71) communicated with the storage room (52) also rises in the same manner.
[0030]
When the water level in the empty chamber (71) exceeds the upper end of the drain discharge pipe (72), the drain is interposed between the upper end and the top plate (73) in a state where there is no air accumulation due to surface tension. The Thereby, the upper end opening of the drain discharge pipe (72) is closed by the drain (state of FIG. 3). This closing operation slightly precedes the rise of the drain water level in the storage chamber (52). Thereafter, when the drain water level in 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. As a result, the drain in the empty chamber (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 enter the drain discharge pipe (72). It flows in and flows out into the drain container (2). When the drain water level coincides with the communication hole (71a), air enters the empty chamber (71), the suction negative pressure disappears, and the drainage is completed.
[0031]
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 passage cross-sectional area of the drain container (2), and the lower end opening of the drain discharge pipe (72) is a sealed chamber in the drain container (2). Although facing the opposite end of (51), since there is a water absorbing sheet (3a), the drain that has flowed into the drain container (2) is absorbed by the water absorbing sheet (3a) and sealed ( It is also distributed on the 51) side and reaches the entire water absorbent sheet (3a). Therefore, the drain comes into contact with almost all of the neutralizers (4) and (4) by passing through the water absorbent sheet (3a), and the use efficiency of the neutralizers (4) and (4) is improved. .
[0032]
The drain is neutralized by contact with the group of neutralizers (4) and (4), and then flows out into the auxiliary container (8) through the hole (22), and the auxiliary container (8) Is temporarily stored in the second discharge pipe, then flows into the second discharge pipe (120) due to overflow, and is discharged to a waste water groove (not shown) or the like through the second discharge pipe (120). In this case, the first discharge pipe (110), the storage container (5), the siphon (7), and the second discharge pipe (120) correspond to the discharge path (11) described in claim 1.
The water absorbing member (3) described above is not limited to the above-described cotton cloth. For example, an open-cell sponge 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-described sheet shape. For example, a block shape may be used.
[0033]
Embodiment of the present invention
In the embodiment of the present invention, instead of the water absorbing member (3) of the drain neutralizer (1a) of Reference Example 1 described above, as shown in FIGS. 4 and 5, a plurality of through holes (34) (34 ) Using a circular perforated plate (33). In the same figure, in the peripheries of the through holes (34), (34) in the perforated plate (33), an annular part (35) protruding toward the upstream side in the drain container (2) ( 35) is provided.
[0034]
In this device, the drain that has flowed into the drain container (2) reaches the inner peripheral portion of the perforated plate (33), and then flows and disperses along the perforated plate (33) toward the outer peripheral side. Then, in the process of dispersion, it flows downstream through the through holes (34) (34). Thereby, the drain reaches the group of neutralizing agents (4) and (4). Therefore, as in Reference Examples 1 and 2, in the group of neutralizers (4) and (4), the reach of the drain increases, and the use efficiency of the neutralizers (4) and (4) is improved.
[0035]
Further, since the drain is not absorbed by the perforated plate (33), it is easy to set the drain passage speed larger than that using the water absorbing member (3). Accordingly, when the flow rate of the drain flowing into the drain container (2) is large, the one using the perforated plate (33) is effective.
In this case, when the water level of the drain on the surface of the porous plate (33) becomes higher than the edge of the annular portion (35) (35), the drain flows into the through hole (34) (34), Since there are the portions (35) and (35), the drain easily flows to the outer peripheral side through the annular portions (35) and (35). Therefore, the above-described drain dispersion is reliable.
[0036]
Even if the through holes (34) and (34) of the perforated plate (33) are arranged so that the passage flow rate increases toward the outer peripheral side of the perforated plate (33), the drain easily flows to the outer peripheral side. Become. Specifically, the drain passage area represented by the number and diameter of the through holes (34) and (34) is increased toward the outer peripheral side.
The drain container (2) may not be one that allows the drain to pass downward. For example, even if the drain is allowed to pass in a substantially horizontal direction, the configuration of the present invention can be adopted, and the same actions and effects can be achieved. Moreover, what passes upwards using a pump etc. may be used.
[0037]
Further, the drain neutralization apparatus (1a) of the present invention may be used for anything other than the heat exchange apparatus (1) as long as it neutralizes the drain generated by condensation of water vapor in the combustion exhaust. .
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a drain neutralizer (1a) of a heat exchange device (1) in Reference Example 1. FIG. 2 is a cross-sectional view taken along line II-II of a drain neutralizer (1a) in FIG. Cross section of drain neutralizer (1a) of heat exchanger (1) of Example 2 [FIG. 4] Cross section of drain neutralizer (1a) of embodiment of the present invention [FIG. 5] In drain of FIG. Cross-sectional view of the perforated plate (33) of the Japanese device (1a) [FIG. 6] Explanatory drawing of the drain neutralizer (1a) of the heat exchange device (1) in the prior art [Explanation of symbols]
(11) ・ ・ ・ Discharge route
(2) ... Drain container
(4) ... Neutralizing agent
(3) ... Water absorbing member
(6) ... Neutralization unit

Claims (1)

An apparatus for neutralizing drain generated by condensation of water vapor in combustion exhaust, the drain being provided in the drain discharge path (11) and having a passage cross-sectional area larger than the cross-sectional area of the discharge path (11) A container (2), a group of neutralizing agents (4) and (4) which are contained so as to be filled in a passage cross section of the drain container (2) and neutralize the drain; and the neutralizing agent (4 And (4) a perforated plate that covers the substantially entire surface upstream of the group and has a plurality of through holes arranged in parallel toward the outer peripheral side,
A drain neutralizing device in which an annular portion protruding toward the upstream side in the drain container is provided at each peripheral edge of the through hole in the perforated plate.

Images