JP4355974B2 - Neutralizer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a neutralization device, and more particularly to a neutralization device used in a high-efficiency combustion device having a latent heat recovery function.
[0002]
[Prior art]
In a combustion apparatus such as a hot water supply apparatus, in general, only sensible heat is used to heat water, but high efficiency is achieved by recovering latent heat in combustion exhaust gas generated by combustion to improve heating efficiency. Combustion devices are known. In a combustion apparatus having such a latent heat recovery function, strongly acidic drain water (condensed water) is generated along with the latent heat recovery. Therefore, it is necessary to neutralize the drain water and then discharge it to the outside.
[0003]
In a combustion apparatus having a latent heat recovery function, a conventionally used neutralization apparatus divides the inside of a plastic neutralization tank by a partition, and a neutralizing agent such as calcium carbonate is provided in each chamber partitioned by the partition. It is what I input. When drain water flows from the drain water inlet provided at one end of the neutralization tank, the drain water is neutralized by reacting with the neutralizer while flowing through each chamber in the neutralization tank. The drain water neutralized to about pH 7) is drained from the outlet.
[0004]
[Problems to be solved by the invention]
Such a neutralizing agent is cumbersome and troublesome if it is introduced into the neutralization tank at the site when the combustion apparatus is installed. Therefore, the combustion apparatus is shipped in a state where the neutralizing agent is put in the neutralizing tank, and the neutralizing agent is crushed and easily powdered during transportation.
[0005]
In addition, since the combustion apparatus is installed outdoors, in winter, drain water in the neutralization tank is frozen, and the neutralization apparatus may be damaged due to volume expansion of the frozen drain water. Therefore, conventionally, a heater is attached to the neutralizer, or drain water in the neutralizer is drained at night to prevent freezing. However, when a heater is used, the running cost is high, and if drain water is drained, there is a problem that the internal neutralizing agent is solidified by drying and clogs the passage.
[0006]
The present invention has been made in view of the problems of the above-described conventional example, and the object of the present invention is to neutralize a neutralizer by freezing drain water because the internal neutralizing agent is not easily pulverized during transportation. It is an object of the present invention to provide a neutralizing device that is less likely to cause damage to water and that is difficult to freeze drain water.
[0007]
[Means for Solving the Problems]
The neutralization apparatus according to claim 1 is a neutralization apparatus in which a neutralizing agent for neutralizing condensed water recovered from combustion exhaust gas of a burner is placed in a neutralization tank. In addition, an elastically deformable buffer portion is provided. Here, the material of the elastically deformable buffer portion is preferably rubber, foam rubber, soft plastic, foamed plastic or the like that is elastically deformed with respect to pressure, and further preferably is one that undergoes volume deformation with respect to pressure.
[0008]
A neutralizing device according to a second aspect is characterized in that the buffer section in the neutralizing device according to the first aspect includes a sealed air layer. Here, the buffer portion provided with a sealed air layer is a rubber or resin of closed cell foam, a rubber or resin surface of an open cell foam, or a hollow inside. .
[0009]
[Action]
In the neutralization device according to claim 1, since the elastically deformable buffer portion is provided in the neutralization tank, the condensed water flowing into the neutralization device is frozen. The volume expansion can be absorbed by the buffer portion, and the neutralization tank is hardly damaged by the volume expansion of the frozen condensed water.
[0010]
In the neutralizing device according to claim 2, since air with high heat insulation is sealed in the buffer portion, the condensed water inside is hardly frozen even when the temperature of the outside air decreases. Furthermore, since condensed water does not permeate into the buffer portion and freeze, the effect of preventing damage to the neutralization tank due to freezing becomes higher.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a combustion apparatus (hot water heater) 1 according to one embodiment of the present invention, and FIG. 2 is a schematic sectional view showing the internal structure thereof. As shown in FIG. 2, a combustion chamber 3 is provided in the outer case 2 of the combustion apparatus 1, a burner 4 is provided in the lower part of the combustion chamber 3, and a burner 4 is provided on the bottom surface of the combustion chamber 3. A blower 5 for supplying combustion air is provided. Further, in the combustion chamber 3, a first heat exchanger 6 for recovering sensible heat and a second heat exchanger 7 for recovering latent heat are disposed in the space above the burner 4. The first heat exchanger 6 for recovering sensible heat is constituted by piping having fins for heat exchange, and the second heat exchanger 7 for recovering latent heat is constituted by arranging piping without fins relatively densely. Has been. Below the second heat exchanger 7, a bowl-shaped drain portion 8 that collects drain water generated in the second heat exchanger 7 is provided. The drain portion 8 is inclined downward toward the drain port 9 so that the drain water falling from the second heat exchanger 7 can be received and discharged from the drain port 9.
[0012]
A neutralizing device 10 is housed in the outer case 2. The neutralization device 10 is connected to the drain port 9 by a flexible pipe 11 and receives the drain water collected by the drain unit 8 to perform a neutralization process. The front surface of the outer case 2 is a front cover 12, and the neutralization device 10 can be easily maintained by loosening the screws fixing the front cover 12 and removing the front cover 12. ing. The exterior case 2 is connected to a water inlet pipe 13 for hot water supply, a hot water hot water supply pipe 14 heated by heat exchange, and a fuel supply pipe 15 to the burner 4.
[0013]
FIG. 3 is a diagram specifically showing the structure of the first heat exchanger 6 and the second heat exchanger 7. With reference to this figure, the principle of hot water supply by the combustion apparatus 1 will be described. When water is supplied to the inlet pipe 13 from an external water supply or the like, the water sequentially passes through the first heat exchanger 6 and the second heat exchanger 7, and hot water heated by both the heat exchangers 6 and 7. Is discharged from the hot water supply pipe 14 to the outside.
[0014]
On the other hand, when fuel, for example, gas is supplied from the fuel supply line 15 and burned in the burner 4, the combustion exhaust gas is stored in the self while it passes through the first heat exchanger 6 and the second heat exchanger 7. Heat and latent heat are applied to the heat exchangers 6 and 7, whereby the water passing through the heat exchangers 6 and 7 is heated and discharged as hot water from the hot water supply pipe 14. The exhaust gas that has passed through the second heat exchanger 7 is exhausted to the outside through the exhaust port 16.
[0015]
The combustion exhaust generated in the burner 4 in this way flows after passing through the first heat exchanger 6 and then flows as indicated by arrows A to O, and passes through between the tube groups of the second heat exchanger 7 and flows first. 2 heat exchange with the heat exchanger 7 until the dew point or less is given, and the latent heat is given to the second heat exchanger 7, and at the same time, the combustion exhaust whose temperature is lowered releases the latent heat and condenses, the second heat exchanger Drain water is generated near 7. This drain water falls into the drain part 8, flows through the drain part 8, and flows into the neutralizer 10 from the drain port 9.
[0016]
Depending on the model, a cleaning nozzle 17 is provided in the vicinity of the second heat exchanger 7, and cleaning water is ejected from the cleaning nozzle 17 at an appropriate time to clean the second heat exchanger 7, and the second heat In some cases, the condensed water adhering to the exchanger 7 can be washed away.
[0017]
FIG. 4 is a sectional view showing the structure of the neutralizing device 10, and FIG. 5 is a partially broken perspective view thereof. The neutralization device 10 is a device in which a neutralizing agent 31 is introduced into a neutralization tank 21 and a top surface is covered with a lid 29. The neutralization tank 21 is made of a hard material such as hard plastic or metal, and a plurality of drain water passage chambers 22 partitioned by partition walls 23a and 23b are provided therein. The partition wall 23a and the partition wall 23b are alternately arranged, the lower end of the partition wall 23b reaches the bottom surface of the neutralization tank 21, and the upper end of the partition wall 23a protrudes slightly above the upper end of the partition wall 23b. Further, a space 26 for commutating drain water is formed at the bottom of the neutralization tank 21, and the space 26 and the drain water passage chamber 22 are partitioned by a partition plate 24. A plurality of holes 25 for allowing drain water to pass therethrough are opened. A drain water introduction port 27 is provided on one side surface of the neutralization tank 21, and a discharge port 28 is provided on the other side surface. The upper surface of the neutralization tank 21 is covered with a lid 29.
[0018]
As shown in FIG. 4, a buffer portion 30 is provided almost entirely on the inner surface of the outer peripheral portion and the inner surface of the bottom portion of the neutralization tank 21. Similarly, the buffer portion 30 is provided on the inner surface of the lid 29 almost entirely. The buffer part 30 is formed of a material having elasticity such as foamed rubber, foamed plastic, rubber, soft resin, foamed ink, etc., and a sheet-like material is bonded to the inner surface of the neutralization tank 21 and the inner surface of the lid 29. Alternatively, it may be integrally formed. As a material of the buffer portion 30, a closed cell foam is particularly desirable. If necessary, the partition walls 23a and 23b may also be formed of an elastic material.
[0019]
Each drain water passage chamber 22 of the neutralization tank 21 is filled with a neutralizing agent 31. As the neutralizing agent 31, granular or lump-like calcium carbonate, magnesium oxide, or the like is used, but it is preferable that the reaction is slow like calcium carbonate and the drain water does not exhibit strong alkali in a steady state.
[0020]
When drain water flows into the neutralization device 10 from the drain water inlet 27, the drain water passes through the hole 25 and the space 26 of the partition plate 24 and is adjacent to the drain water passage chamber 22 as shown by arrows in FIG. Or the drain water passage chamber 22 adjacent to the upper end of the partition wall 23b. At this time, the drain water flows through the drain water passage chamber 22 while being in contact with the neutralizer 1, and is neutralized by the neutralizer 31 in the middle thereof. The drain water thus neutralized is discharged from the discharge port 28 to a drainage groove on the ground. When the neutralization process proceeds and the neutralizing agent 34 is consumed, the front cover 12 is removed, the lid 29 of the neutralizing device 10 is opened, and a new neutralizing agent 31 is filled in the neutralizing device 10.
[0021]
As described above, the neutralizing device 10 is provided with the buffer portion 30 made of an elastic material on the inner surfaces of the neutralizing tank 21 and the lid 29, so that the neutralizing device 31 is filled with the neutralizing agent 31. Even when the neutralizing device 10 is transported in a state where the neutralizing device 10 is transported, it is possible to prevent the shock during transportation from being absorbed by the buffer 30 and the neutralizing agent 31 from being broken and pulverized.
[0022]
In addition, since the combustion apparatus 1 is installed outdoors, the drain water may freeze if the drain water stays at night in winter. In the conventional neutralization device, if the drain water inside is frozen, the neutralization tank 21 may be damaged. However, in this neutralization device 10, the volume expansion is absorbed by the buffer 30 even if the drain water is frozen. Thus, damage to the neutralization tank 21 is avoided.
[0023]
In particular, if a closed cell foam such as rubber or resin is used as the buffer portion 30, the heat insulation effect makes it difficult for the drain water to freeze even when the outside air temperature decreases, and the effect of preventing freezing is enhanced. Moreover, when drain water permeates into the buffer part 30 and freezes, the effect of preventing the neutralization tank 21 from being damaged by the buffer part 30 is reduced. However, since the drain water does not enter the closed cell, The effect of preventing damage is also increased.
[0024]
(Another embodiment)
FIG. 6 is an exploded perspective view (with the lid omitted) showing the structure of the neutralization device 10 according to another embodiment of the present invention. In this embodiment, a buffer portion 32 as shown in the figure is placed inside the neutralization tank 21. The buffer portion 32 is provided with partition walls 23 a and 23 b in a rectangular tube-shaped peripheral wall portion 33 sized so as to fit almost exactly in the neutralization tank 21. , The openings 36 and 37 communicating with the drain water introduction port 27 and the discharge port 28 are opened. The buffer 32 includes the peripheral wall 33 and the partition walls 23a and 23b, and is integrally formed of a flexible rubber, a soft plastic, a closed cell foam of rubber or resin, or the like.
[0025]
Also in this neutralization apparatus 10, since the buffer part 32 is stored in the neutralization tank 21, the drain water passage chamber 22 between the partition walls 23a and 23b is filled with the neutralizing agent 31, so as in the previous embodiment. There are effects such as prevention of pulverization of the neutralizing agent 31 during transportation and prevention of breakage of the neutralization tank 21 during freezing. Moreover, when the buffer part 32 is a closed-cell foam, there also exists an effect of preventing freezing of drain water.
[0026]
Further, as shown in FIG. 6, the peripheral wall portion 33 of the buffer portion 32 is provided with a thin portion 35 between the thick ribs 34 so that a space is generated between the thin portion 35 and the inner wall surface of the neutralization tank 21. Therefore, the peripheral wall portion 33 of the buffer portion 32 is more easily deformed.
[0027]
(Still another embodiment)
FIG. 7 is a cross-sectional view showing the structure of the neutralization apparatus 10 according to still another embodiment of the present invention. In this embodiment, a block-shaped buffer portion 38 is placed in the upper space in the neutralization tank 21 and placed on the partition wall 23a.
[0028]
The buffer portion 38 used here is formed of a material having water absorption properties such as sponge. Accordingly, when the drain water in the neutralization tank 21 is frozen and the volume expands and comes into contact with the upper buffer portion 38, the buffer portion 38 sucks up the drain water, so that the volume expansion due to the freezing of the drain water is alleviated. The damage of the neutralization tank 21 can be prevented.
[0029]
Further, when the neutralizer or the combustion apparatus is transported in a state where the neutralizer is filled, the neutralizer may move and be biased inside, but in this embodiment, the neutralizer 31 is filled. Since the upper surface of the drain water passage chamber 22 is closed by the buffer portion 38, the neutralization agent 31 can be prevented from being biased. Furthermore, since the buffer part 38 is put above the neutralizing agent, it is possible to prevent the neutralizing agent inside from being broken and pulverized by vibration during transportation. Therefore, it can prevent that a neutralizing agent pulverizes and flows with condensed water.
[0030]
Since the buffer part 38 has water absorption, even if the absorbed drain water freezes and the lower part of the buffer part 38 freezes, the drain water flowing in from the drain water inlet 27 passes through the upper part of the buffer part 38. Drained from the outlet 28. Moreover, as shown in FIG. 8, if the buffer part 38 has the through-hole 39 which penetrates from the drain water introduction port 27 side to the discharge port 28 side, drain water can be made to pass still better.
[0031]
Although not shown, even if a buffer portion 38 made of a foamed material such as rubber, soft resin, sponge, rubber or resin is placed in the space 26 below the partition plate 24, the drain water is prevented from freezing and is neutralized. 21 is effective in preventing damage.
[0032]
【The invention's effect】
According to the neutralization device of the first aspect, even when the condensed water in the interior is frozen, the volume expansion can be absorbed by the elasticity of the buffer portion, so that the neutralization tank can be prevented from being damaged.
[0033]
Moreover, according to the neutralization apparatus of Claim 2, even when outside temperature is low, internal condensed water becomes difficult to freeze by the heat insulation effect | action of the buffer part which sealed the air layer inside, Damage can be prevented.
[0034]
Therefore, unlike the conventional neutralization apparatus, there is no need to provide a heater for preventing freezing of condensed water, and the running cost for preventing freezing can be eliminated. Moreover, the trouble of discharging the condensed water in the neutralization tank is saved, and the internal neutralizing agent does not solidify and cause clogging.
[Brief description of the drawings]
FIG. 1 is a front view of a combustion apparatus provided with a neutralization apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view showing the configuration of the above combustion apparatus.
FIG. 3 is a view showing first and second heat exchangers in the combustion apparatus.
FIG. 4 is a cross-sectional view of the neutralization apparatus before filling with a neutralizing agent.
FIG. 5 is a partially broken perspective view of the same neutralizing device with the lid omitted.
FIG. 6 is an exploded perspective view of a neutralization device according to another embodiment of the present invention.
FIG. 7 is a cross-sectional view of a neutralization apparatus according to still another embodiment of the present invention.
FIG. 8 is a cross-sectional view showing another example of the buffer portion housed in the neutralization device.
[Explanation of symbols]
6 1st heat exchanger 7 2nd heat exchanger 8 Drain part 10 Neutralizing device 21 Neutralizing tank 22 Drain water passage chambers 23a, 23b Partition walls 30, 32, 38 Buffer part 31 Neutralizing agent

Claims (2)

In a neutralizer that contains a neutralizer for neutralizing condensed water recovered from the combustion exhaust of the burner in a neutralization tank,
A neutralizing apparatus characterized in that an elastically deformable buffer portion is provided in the neutralizing tank. The neutralization device according to claim 1, wherein the buffer portion includes a sealed air layer.

Images