JP4125098B2 - Drain neutralizer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drain neutralizer for neutralizing acidic drain generated in a latent heat recovery type water heater or the like.
[0002]
[Prior art]
Conventionally, a main heat exchanger mainly for the purpose of sensible heat recovery is provided on the upstream side of the combustion exhaust flow path, and a sub heat exchanger mainly for the purpose of recovering latent heat is provided on the downstream side to obtain latent heat. A recovery water heater is known.
In such a latent heat recovery type water heater, water vapor in the combustion exhaust is condensed by latent heat recovery in the auxiliary heat exchanger, and drainage is generated. This drain is condensed by reacting water vapor, nitrogen oxide (NO _x ), etc. in the combustion exhaust gas, and has an acidity of about pH 3. For this reason, it may deviate from the drainage standard (for example, pH 5.8 to 8.6) determined by the local government, and cannot be discharged into a general drainage passage such as a sewer as it is.
[0003]
For this reason, the latent heat recovery type water heater as described above includes a drain neutralizer using calcium carbonate or magnesium oxide as a neutralizing agent (see, for example, Patent Document 1).
In such a drain neutralization apparatus 50, as shown in FIG. 7, the drain passage 51 allows the drain to flow downward, and then reverses the flow direction of the drain by the reversing unit 54 so as to face upward. A plurality of bent path portions 52 that are allowed to flow through. That is, the drain passage 51 is formed by meandering a plurality of times in the vertical direction.
And the granular neutralizing agent C, such as calcium carbonate, is filled in the lower passage portion 53, the reversing portion 54, and the upper passage portion 55 going upward in the drain passage 51, and is generated in the auxiliary heat exchanger. By introducing drain through the inlet 56 and allowing the gap between the neutralizers C to flow, the drain is neutralized with the neutralizer C to neutralize it, and the neutralized drain is discharged to the outlet 57. Is discharged from. That is, the drain has a structure in which a predetermined amount is accumulated in the drain passage 51, and when a new drain is introduced from the introduction port 56, the old drain is discharged from the discharge port 57 correspondingly.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-252676
[Problems to be solved by the invention]
However, since the drain neutralizer 50 has a structure in which the old drain is accumulated in the drain passage 51 filled with the neutralizing agent C as described above, the replacement of the new drain with the old drain is not successful, and the old drain is replaced. It was disturbed that the new drain did not come into contact with the neutralizer C. As a result, in order to secure a contact area between the drain and the neutralizing agent C for obtaining a sufficient neutralization capacity, the drain passage 51 must be lengthened, and the apparatus becomes large, and the inside of the water heater It was difficult to secure the installation location.
The drain neutralization apparatus of the present invention aims to solve the above-mentioned problems and make it compact while maintaining sufficient neutralization ability.
[0006]
[Means for Solving the Problems]
The drain neutralization apparatus according to claim 1 of the present invention for solving the above-mentioned problems is
A drain neutralizer for neutralizing acidic drain generated in a latent heat recovery type water heater,
A box with an inlet on the top and a discharge on the bottom;
A vertical wall that is formed by allowing the drain passage to meander in the horizontal direction by standing vertically from the bottom of the box body and partitioning the box body in the vertical direction with the introduction port and the discharge port in communication with each other;
A neutralizing agent filled in the box, and
The height of the vertical wall is approximately ½ of the height of the box, and the upper part of the box is made into an integral space without partitioning, and the neutralizing agent is filled up to the integral space,
The gist is that the drain introduced from the introduction port is caused to flow along the drain passage to the bottom surface of the box and to be neutralized by contacting with the neutralizing agent.
[0008]
In the drain neutralization apparatus according to claim 1 of the present invention having the above-described configuration, the drain introduced from the inlet is dripped onto the bottom surface of the box body, and along the drain passage where the bottom surface of the box body is partitioned by the vertical wall. From the introduced material, it smoothly flows to the outlet while contacting the neutralizing agent. Therefore, since the old drain does not collect in the drain passage filled with the neutralizing agent, the newly introduced drain can always be in good contact with the neutralizing agent. For this reason, the drain neutralizer can be downsized while securing a contact area between the drain and the neutralizing agent sufficient for neutralization.
[0009]
By the way, as described above, when drain is flowed from the inlet to the outlet along the drain passage, the acidity of the drain is stronger near the inlet, so the neutralizer is closer to the inlet. A lot is consumed. For this reason, if neutralization is performed for a long time, the neutralizing agent disappears in order from the vicinity of the introduction port, the position of the neutralization start point approaches the discharge port, and the drain and neutralizing agent A sufficient contact area cannot be secured, and the neutralization ability is reduced.
On the other hand, in the drain neutralizing apparatus of the present invention , the height of the vertical wall is approximately ½ of the height of the box so that the upper part of the box is not partitioned by the vertical wall . For this reason, even if the neutralizing agent in the vicinity of the introduction port is consumed , the neutralizing agent rolls down from the entire upper part of the box , so that even if a long time has passed, the drain passage from the vicinity of the introduction port to the discharge port Can be filled with a neutralizing agent, and a sufficient neutralizing ability can be obtained.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
In order to further clarify the configuration and operation of the present invention described above, after a reference embodiment is described, a preferred embodiment of the drain neutralization apparatus of the present invention will be described.
[0011]
<< Reference Embodiment >>
As shown in FIG. 2, the latent heat recovery type water heater 1 of the reference embodiment (hereinafter simply referred to as a “water heater 1”) is provided with a combustion chamber 3 in the instrument body 2 and is connected to a DC motor 4 above the combustion chamber 3. An air supply fan 5 is attached.
The appliance body 2 has an air supply port 6 for taking outside air as combustion air and an exhaust port 7 for discharging exhaust gas above the air supply port 6.
[0012]
In the combustion chamber 3, a burner 9 is attached to the mounting plate 8 in order from the top with the flame opening side facing downward, and burners 9 combust a mixed gas of fuel gas and primary air from the supply fan 5. Main heat exchanger 10 that mainly recovers sensible heat of the combustion gas, sub-heat exchanger 11 that mainly recovers latent heat by generating drain, and heat exchange through the main and sub-heat exchangers 10 and 11. An exhaust hood 12 made of stainless steel is provided to exhaust the exhaust gas after being applied. The exhaust hood 12 has a bowl shape that is largely open upward, and is connected to a drain discharge pipe 13 at the bottom.
Further, the exhaust hood 12 also has a drain pan as a tray for receiving drain in the combustion gas, and the collected drain passes through the drain discharge pipe 13 to be drain neutralizer 30 (hereinafter simply referred to as neutralizer 30). Is discharged into a general drainage passage such as a sewer. The neutralizer 30 will be described in detail later.
An exhaust pipe 14 is connected to a side surface of the exhaust hood 12, and an upper end opening of the exhaust pipe 14 faces the exhaust port 7.
[0013]
The main heat exchanger 10 is provided with main heat transfer tubes 10b penetrating through main fins 10a that absorb combustion heat in two upper and lower stages, and each stage meandering in the depth direction a plurality of times. The sub heat exchanger 11 is provided with a sub heat transfer tube 11b penetrating through a sub fin 11a that absorbs combustion heat in a single stage and meandering in the depth direction a plurality of times. The main fin 10a and the sub fin 11a are both made of copper having excellent thermal conductivity. However, the sub fin 11a is coated with a resin coating on the surface in order to improve the corrosion resistance against acid drain. The combustion chamber 3 is provided with a winding tube 15 for recovering sensible heat from the combustion gas before passing through the main heat exchanger 10 and the sub heat exchanger 11 and wound around the outside.
[0014]
The water passage is composed of a water supply pipe 16, a sub heat transfer pipe 11 b, a main heat transfer pipe 10 b, a winding pipe 15, and a hot water discharge pipe 17 that are water inlets in order from the upstream. A bypass pipe 39 that bypasses the main heat exchanger 10, the auxiliary heat exchanger 11, and the winding pipe 15 is provided between the water supply pipe 16 and the hot water pipe 17.
Except for the auxiliary heat transfer tube 11b, the water passage is made of simple copper having excellent thermal conductivity, and the auxiliary heat transfer tube 11b is obtained by applying a resin coating to copper in order to improve corrosion resistance against drainage.
[0015]
At the connection between the water supply pipe 16 and the bypass pipe 39, there is provided a water side control unit 18 having a water motor for controlling the amount of water flow to the water quantity sensor, water governor and bypass pipe 39, and a gas pipe to the burner 9. 19 is provided with a main electromagnetic valve 20 and a gas proportional valve 21. Further, the water amount sensor in the water-side control unit 18, the main electromagnetic valve 20 and the gas proportional valve 21, the DC motor 4, and the like are electrically connected to a burner controller 22 that controls the combustion of the water heater 1. .
In addition, branch pipes for draining water in the water passages are provided at the distal ends of the water supply pipe 16 and the hot water outlet pipe 17 and the drain plugs 23a and 23b are provided at the distal ends of the branch pipes. Provided. When it is desired to drain water after using the water heater 1, the drain plugs 23a and 23b can be removed to drain water.
[0016]
Next, the neutralizer 30 will be described in detail.
As shown in FIGS. 1 and 3, the neutralizer 30 includes a rectangular box 31 having an upper surface opened, a lid 32 covering the upper surface opening of the box 31, and a medium for neutralizing the drain. Compatibilizer C. 1 is a view after the neutralizing agent C is filled, and FIG. 3 is a view before the neutralizing agent C is filled. The inside of the box 31 is partitioned by a vertical wall 33 erected from the bottom surface of the box 31, and a drain passage 34 is formed by meandering in the horizontal direction. The vertical wall 33 is formed to have the same height as the box 31. The drain passage 34 is initially formed along the longitudinal direction of the box 31, bent in a U shape twice in parallel with the longitudinal direction, and then bent in an L shape, and finally in the short direction. Formed along.
The lid 32 has an introduction port 32 a serving as a drain introduction portion for the neutralizer 30. The drain discharge pipe 13 is inserted through the introduction port 32a. Then, when the box body 31 is covered with the lid body 32, the portion of the box body 31 that comes below the introduction port 32 a is partitioned by a trap plate 35 having an introduction hole 35 a opened in the upper part to form a water sealed chamber 36. Is done. The opening position of the introduction hole 35 a is set so that the lower end thereof is higher than the tip of the drain discharge pipe 13. A net 35b is attached to the introduction hole 35a.
[0017]
Further, a discharge port 31 a serving as a drain for discharging the drain from the neutralizer 30 is opened on the bottom surface of the box 31 at the end point of the drain passage 34. A net 31b is attached to the discharge port 31a, and a discharge pipe 37 is communicated.
As shown in FIG. 1, the drain passage 34 of the box 31, that is, a place other than the water seal chamber 36 is filled with granular calcium carbonate (particle diameter: 3 mm) as a neutralizing agent C to the full extent. The
The length of the drain passage 34 is set to a length that can secure a contact area with the neutralizing agent C sufficient to neutralize acidic drain.
Further, a drain plug 38 is provided on the lower surface of the water sealing chamber 36 for draining the drain accumulated in the water sealing chamber 36.
[0018]
In the water heater 1 configured as described above, water (broken arrow in the figure) flows through the water supply pipe 16 by opening a hot water tap (not shown). The main electromagnetic valve 20 and the gas proportional valve 21 are opened to supply fuel gas (solid arrow in the figure) to the burner 9, and outside air is supplied from the air supply port 6 provided in the instrument body 2 by the air supply fan 5. It is sucked into the instrument main body 2 and introduced into the burner 9 for combustion as combustion air, and the burner 9 is ignited by an igniter (not shown).
The air-fuel mixture burns in the vicinity of the flame outlet of the burner 9 to form a flame, and the combustion is completed (complete combustion) while reaching the vicinity of the upstream side of the main heat exchanger 10.
Since the main heat exchanger 10 is provided upstream of the combustion gas flow path and the sub heat exchanger 11 is provided downstream of the combustion gas flow path, the high-temperature combustion gas from the burner 9 is supplied to the main heat exchanger by the air supply fan 5. 10 through the main fins 10a, mainly sensible heat is taken away and heat exchange is performed, and the combustion gas whose temperature is thereby lowered mainly takes out latent heat in the auxiliary heat exchanger 11 and exchanges heat to exhaust. It is discharged out of the device through the mouth 7. Drain generated by depriving the combustion gas of latent heat in the auxiliary heat exchanger 11 falls into the exhaust hood 12, passes through the drain discharge pipe 13, is processed by the neutralizer 30, and is discharged to the general drainage passage. .
[0020]
Next, the drain neutralization process in the neutralizer 30 will be described.
The drain introduced into the neutralizer 30 from the drain discharge pipe 13 inserted through the introduction port 32a accumulates in the water seal chamber 36, and overflows from the introduction hole 35a into the drain passage 34 when the water level exceeds the introduction hole 35a. The drain overflowing from the introduction hole 35a is transferred to the bottom surface of the box 31 through the trap plate 35, and is introduced along the drain passage 34 in which the bottom surface of the box 31 is partitioned by the vertical wall 33. Sequentially from the outlet 31a while in contact with the neutralizing agent C. The drain that has been neutralized by the neutralizing agent C (pH 3 → pH 6.5 to 7.0) is discharged from the discharge port 31 a to the general drainage passage through the discharge pipe 37.
[0021]
Therefore, since old drain does not accumulate in the drain passage 34 filled with the neutralizing agent C, the drain overflowing newly from the introduction hole 35a smoothly flows to the discharge port 31a while always in good contact with the neutralizing agent C. To go. For this reason, even if the length of the drain passage 34 through which the drain flows is shortened, a sufficient contact area between the drain and the neutralizing agent C can be secured. That is, it becomes possible to manufacture the neutralizer 30 in a compact manner, and the degree of freedom in the layout in the water heater 1 in which the neutralizer 30 is disposed is increased, thereby improving the design flexibility.
[0022]
Further, since the tip of the drain discharge pipe 13 is configured to be lower than the lower end of the introduction hole 35a, the tip of the drain discharge pipe 13 is located in the drain accumulated in the water seal chamber 36. . For this reason, the combustion exhaust gas that passes through the drain discharge pipe 13 can be shut off by the drain accumulated in the water seal chamber 36, and exhaust leakage from the neutralizer 30 is prevented. In addition, since the exhaust gas may leak if the drain discharge pipe 13 is used only in the drain in the water sealing chamber 36, the height of the tip of the drain discharge pipe 13 can sufficiently seal the exhaust gas. It is set to such a height that the drain discharge pipe 13 is held in the drain.
Further, by attaching the nets 35b and 31b to the introduction hole 35a and the discharge port 31a, it is possible to prevent the granular neutralizing agent C from spilling out therefrom.
[0023]
"Implementation form"
Next, the neutralizer as one embodiment of the present invention will be described with reference to FIGS. In addition, a different part from the said reference embodiment is demonstrated, about the overlapping part, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
[0024]
As described above, when the drain is caused to flow along the drain passage 34 from the introduction hole 35a to the discharge port 31a, the acidity of the drain is stronger near the introduction hole 35a. The sum C is consumed more near the introduction hole 35a. FIG. 4 is a cross-sectional view taken along one-dot chain line AA in FIG. 1 after the neutralizer 30 has been used for a predetermined period. For this reason, in the neutralizer 30 of the reference embodiment, when the neutralization treatment is performed for a long period of time, the neutralizing agent C disappears in order from the vicinity of the introduction hole 35a, and the position of the neutralization start point is the discharge port 31a. Thus, a sufficient contact area between the drain and the neutralizing agent C cannot be ensured, and the neutralizing ability is reduced.
[0025]
Therefore, in the neutralizer 40 of the present embodiment, as shown in FIG. 5, the height of the vertical wall 43 that partitions the box body 31 is set lower than the height of the box body 31 (for example, the height of the box body 31). 1/2), the upper portion of the box body 31 is not partitioned and is formed as an integrated space 48.
Accordingly, when the neutralizing agent C in the vicinity of the introduction hole 35a, that is, in the vicinity of the neutralization start point is consumed, the neutralizing agent C rolls down from the entire integrated space 48 as shown in FIG. For this reason, the neutralizing agent C is gradually replenished sequentially from the downstream side of the drain passage 44 to the neutralization start point where the neutralizing agent C is quickly reduced, and the neutralizing agent C is averaged over the entire drain passage. It will decrease. Therefore, even if the neutralizing agent C is consumed, the length of the drain passage 44 filled with the neutralizing agent C can be sufficiently secured, and sufficient neutralizing ability can be obtained even after a long period of time. Can be maintained.
In other words, the length of the drain passage 44 is designed to be longer than necessary in consideration of the case where the neutralizing agent C is locally lost, such as in the vicinity of the introduction hole 35a after a long period of time. It is no longer necessary to ensure a sufficient neutralization ability after the period has elapsed, and further downsizing can be achieved.
FIG. 6 is a cross-sectional view taken along one-dot chain line BB in FIG. 5 after the neutralizer 40 has been used for a predetermined period.
[0026]
Although the embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention.
[0027]
【The invention's effect】
As described above in detail, according to the drain neutralizing apparatus of the first aspect of the present invention, the newly introduced drain can be always brought into contact with the neutralizing agent satisfactorily. It is possible to reduce the size while securing the contact area between the drain and the neutralizing agent. As a result, when a drain neutralizing device is to be mounted on a device that generates drain, it is easy to secure a space for the drain neutralizing device, and the flexibility of device design is increased.
[0028]
Furthermore, according to the drain neutralizing apparatus of the first aspect of the present invention, the neutralizing agent can be replenished from the downstream side of the drain passage in the vicinity of the inlet where the neutralizing agent is quickly reduced. For this reason, it is possible to average the bias of how the neutralizing agent is reduced and to fill the entire drain passage with the neutralizing agent for a long period of time, and to maintain a sufficient neutralizing ability for a long period of time. In other words, taking into account the fact that the neutralizing agent has run out locally, such as the neutralization start point after a long period of time, the length of the drain passage is designed to be longer than originally necessary, It is no longer necessary to secure a neutralization capacity for the later margin, and it is possible to further reduce the size.
[Brief description of the drawings]
FIG. 1 is an external view of a neutralizer as a reference embodiment (after filling with a neutralizing agent).
FIG. 2 is a schematic configuration diagram of a water heater as a reference embodiment.
FIG. 3 is an external view of a neutralizer as a reference embodiment (before filling with a neutralizing agent).
FIG. 4 is a cross-sectional view of a neutralizer as a reference embodiment.
FIG. 5 is an external view of a neutralizer as one embodiment of the present invention (before filling with a neutralizing agent).
FIG. 6 is a cross-sectional view of a neutralizer as an embodiment of the present invention .
FIG. 7 is a cross-sectional view of a drain neutralizer as a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Water heater, 30, 40 ... Neutralizer, 31 ... Box, 31a ... Discharge port, 34 ... Drain passage, 32a ... Inlet port, 33, 43 ... Vertical wall, 35a ... Introduction hole, 48 ... Integrated space, C: Neutralizing agent.

Claims (1)

A drain neutralizer for neutralizing acidic drain generated in a latent heat recovery type water heater,
A box with an inlet on the top and a discharge on the bottom;
A vertical wall that is formed by allowing the drain passage to meander in the horizontal direction by standing vertically from the bottom of the box body and partitioning the box body in the vertical direction with the introduction port and the discharge port in communication with each other;
A neutralizing agent filled in the box, and
The height of the vertical wall is approximately ½ of the height of the box, and the upper part of the box is made into an integral space without partitioning, and the neutralizing agent is filled up to the integral space,
A drain neutralizing apparatus, wherein drain introduced from the inlet is caused to flow along the drain passage to the bottom surface of the box and to be neutralized by contacting with the neutralizing agent.

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