JP2000107771A - Neutralization apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact neutralization tank capable of stably neutralizing acidic condensed water so as to satisfy waste water standards. SOLUTION: In a neutralization apparatus 80 provided with a treatment tank 84 packed with a basic neutralizing agent 86, an inlet pipe 81 guiding acidic condensed water to the treatment tank 84 and a drain pipe 87 discharging treated water from the treatment tank 84, a bypass pipe 82 bypassing the inlet pipe 81 and the drain pipe 87 and mixing acidic condensed water with treated water is formed and a solenoid valve 83 is disposed on the way of the bypass pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for neutralizing acidic condensed water, and more particularly, to a device for neutralizing acidic condensed water generated by a high-efficiency heat exchanger used for a hot water heater or the like.

[0002]

2. Description of the Related Art When highly efficient heat exchange is performed between a combustion gas generated from a burner or the like and a fluid such as water using a heat exchanger, acidic condensed water in which components in the combustion gas are dissolved. Is generated. If this acidic condensed water is drained as it is,
Drainage pipes and surrounding structures are corroded. Therefore, for example, the neutralizing device disclosed in Japanese Patent Application Laid-Open No. 6-328084 has a configuration in which acidic condensed water is introduced into a retention tank filled with a neutralizing agent, neutralized, and then drained. A general drainage standard defined by the Water Pollution Control Law and prefectural ordinances has a pH of 5.8 or more and 8.6 or less.

[0003]

However, in the above-mentioned conventional apparatus, the flow path of the condensed water in the neutralizing device is the same regardless of the amount of the condensed water and the aging of the neutralizing agent. In addition, there is a problem that the neutralization condition is not constant and the neutralization performance becomes unstable, for example, the contact time between the neutralizing agent and the condensed water varies. When a basic neutralizing agent such as magnesium, which has a strong alkaline equilibrium PH when reacted with an acid, is used as a neutralizing agent, the neutralization can be performed with a small amount of the neutralizing agent, but the condensed water becomes longer. When staying in the tank over time, the condensed water and the basic neutralizer react excessively,
The treated water discharged from the neutralization device becomes alkaline. Therefore, there is a problem that the size of the neutralization device cannot be reduced by using a basic neutralizing agent having high neutralization performance. Further, when the neutralizing agent is filled with a large amount so that the neutralizing agent does not need to be replaced frequently, the treated water immediately after the start of the operation of the neutralizing device also becomes alkaline. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a compact neutralizing device that can effectively neutralize condensed water by effectively using a neutralizing agent.

[0004]

In order to achieve the above object, a neutralization apparatus of the present invention comprises a treatment tank filled with a basic neutralizing agent, an introduction pipe for introducing acidic condensed water to the treatment tank, In a neutralization device provided with a drain pipe for draining treated water from the treatment tank, a bypass pipe for bypassing the inlet pipe and the drain pipe and mixing acidic condensed water with the treated water is provided, and The first feature is that a solenoid valve is provided in the first embodiment.

[0005] According to the neutralization device of the present invention, the treated condensed water before being introduced into the treatment tank is passed through the bypass pipe to the treated water that has become alkaline due to an excessive reaction with the basic neutralizing agent. Through the mixing, it is possible to adjust the pH of the treated water to a drainable pH. As a result, a basic neutralizing agent can be used, and the size of the neutralizing device can be reduced.

[0006] Further, the neutralization apparatus of the present invention comprises a treatment tank filled with a basic neutralizing agent, an inlet pipe for guiding acidic condensed water to the treatment tank, and a drain pipe for draining treated water from the treatment tank. In the neutralization device provided with, a bypass pipe that bypasses the introduction pipe and the drain pipe and mixes the acidic condensed water with the treated water is provided, and a flow control valve that controls the flow rate of the condensed water in the middle of the bypass pipe. Is a second feature.

According to the neutralizing device of the present invention, the treated condensed water before being introduced into the treatment tank is passed through the bypass pipe to the treated water which has become alkaline due to an excessive reaction with the basic neutralizing agent. Through the mixing, it is possible to adjust the pH of the treated water to a drainable pH. As a result, a basic neutralizing agent can be used, and the size of the neutralizing device can be reduced. Moreover, by controlling the flow rate of the acidic condensed water mixed with the treated water by the flow rate control valve, the treated water can be stably maintained at a PH capable of draining.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall configuration diagram when a neutralizing device of the present invention is used for a water heater, FIG. 2 is a cross-sectional view of a main portion showing a first embodiment of the neutralizing device of the present invention, FIG. 3 is a sectional view of a main part showing a second embodiment of the neutralization device of the present invention.

In FIG. 1, a water heater 10 has a main heat exchanger 2 upstream and an auxiliary heat exchanger 4 downstream in a flue gas passage 7 above a burner 1 with a drain receiver 6 interposed therebetween. are doing. Water supplied from tap water or the like is branched upstream of the main heat exchanger 2 and the auxiliary heat exchanger 4, and is passed through the water pipe 3 and the branch pipe 5. The water passed through the branch pipe 5 is supplied to the auxiliary heat exchanger 4
Then, the water passed through the water pipe 3 joins after being heated by the main heat exchanger 2 respectively, and is discharged from a hot water supply pipe (not shown). That is, the water passed through the branch pipe 5 is heated in the auxiliary heat exchanger 4 by the combustion gas that has been heated by the main heat exchanger 2. At this time, strongly acidic condensed water containing a combustion gas component is generated in the auxiliary heat exchanger 4. The condensed water is supplied to a drain receiver 6 disposed below the auxiliary heat exchanger 4.
And is guided to the neutralization device 80 via the introduction pipe 81. After the neutralization process is performed here, the water is drained from the drain pipe 87. An electromagnetic valve 83 is provided in the middle of a bypass pipe 82 that bypasses the introduction pipe 81 and the drain pipe 87, and can control opening and closing of the flow path. Note that the water flow ratio between the main heat exchanger 2 and the auxiliary heat exchanger 4 can be adjusted by the water amount control valve 9.

FIG. 2 is a cross-sectional view of a main part of a first embodiment of the neutralization apparatus of the present invention, which comprises a processing tank 84, an inlet pipe 81, a bypass pipe 82, a drain pipe 87, and a solenoid valve 83. The processing tank 84 is filled with a neutralizing agent 86 such as magnesium.

Normally, the solenoid valve 83 of the bypass pipe 82 is closed, and the acidic condensed water is supplied through the introduction pipe 81 to the treatment tank 8.
Flow into 4. The inside of the processing tank 84 is partitioned by a partition plate 85, forms a flow path bent in the vertical direction, and is filled with a neutralizing agent 86. The condensed water reacts with the neutralizing agent 86 toward the downstream side. Then, the bent and flowing, neutralized treated water is drained from the drain pipe 87.

The use of the water heater 10 is stopped, and the processing tank 84 is stopped.
When the inflow of condensed water into the tank stops, the condensed water that has already flowed in stays in the tank. If the staying time extends for a long time, the staying condensed water becomes alkaline due to an excessive reaction with the neutralizing agent 86. As a result, when the inflow of the condensed water from the introduction pipe 81 is restarted,
Alkaline treated water exceeding the drainage standard retained in the tank will be drained. By opening the electromagnetic valve 83 for a predetermined time and mixing the acidic condensed water with the treated water through the bypass pipe 82, the treated water that has become alkaline is neutralized again and can be drained. This makes it possible to use a basic neutralizing agent having a high neutralizing performance as the neutralizing agent 86, thereby reducing the amount of the neutralizing agent 86 and downsizing the neutralizing device.

The solenoid valve 83 is opened for a predetermined time when the water heater 10 is not used for a predetermined time since the last use and is reused, or is connected to the bypass pipe 82 at the drain pipe 87. A PH sensor (not shown) is installed downstream of the section, and is opened when the pH of the treated water indicates an alkalinity exceeding the drainage standard.

FIG. 3 is a cross-sectional view of a main part of a second embodiment of the neutralizing device according to the present invention. A bypass pipe 82 is provided with a flow control valve 88. The other configuration is the same as that of the first embodiment shown in FIG. 2, and the detailed description is omitted here.

When the flow of the condensed water into the processing tank 84 stops,
The condensed water already flowing into the tank will stay. When the staying time extends for a long time, the staying condensed water becomes alkaline due to an excessive reaction with the neutralizing agent 86. As a result, when the inflow of the condensed water from the introduction pipe 81 is resumed, the alkaline treated water exceeding the drainage standard retained in the tank is drained. The pH of the treated water is detected by a PH sensor (not shown) provided downstream of the connection between the drainage pipe 87 and the bypass pipe 82, and the flow rate of the acidic condensed water mixed with the treated water in accordance with the strength of the alkalinity. Is controlled by the flow control valve 88. As a result, the treated water can be reliably and stably neutralized within the effluent standard, and a basic neutralizer having a high neutralization performance can be used as a neutralizing agent. The amount can be reduced and the neutralization device can be downsized.

When the water heater 10 is reused after a lapse of a predetermined time from the previous use, the flow rate of the acidic condensed water mixed with the treated water via the bypass pipe 82 is reused by the flow control valve 84. Control may be performed so as to gradually decrease as time elapses from the start.

[0017]

With the above-described configuration, the neutralizing device of the present invention has the following effects. That is, according to the neutralizing device of the present invention, the acidic condensed water before being introduced into the processing tank is mixed with the treated water that has become alkaline due to an excessive reaction with the neutralizing agent via the bypass pipe. By doing so, it is possible to adjust the pH of the treated water to a drainable pH. As a result, a basic neutralizing agent can be used, and the size of the neutralizing device can be reduced. According to the neutralizing device of the present invention, the acidic condensed water before being introduced into the processing tank is mixed with the treated water that has become alkaline due to an excessive reaction with the basic neutralizing agent via the bypass pipe. By doing so, it is possible to adjust the pH of the treated water to a drainable pH. As a result, a basic neutralizing agent can be used, and the size of the neutralizing device can be reduced. In addition, by controlling the flow rate of the acidic condensed water mixed with the treated water by the flow control valve, the treated water can be stably maintained at a PH at which the treated water can be drained.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a water heater using a neutralization device of the present invention.

FIG. 2 is a sectional view of a main part showing a first embodiment of the neutralization device of the present invention.

FIG. 3 is a sectional view of a main part showing a second embodiment of the neutralization device of the present invention.

[Explanation of symbols]

 2 Main heat exchanger 4 Auxiliary heat exchanger 80 Neutralizer 81 Inlet pipe 82 Bypass passage 83 Solenoid valve 84 Processing tank 85 Partition plate 86 Neutralizer 87 Drain pipe 88 Flow control valve

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hidenori Hata 93, Edo-cho, Chuo-ku, Kobe-shi, Hyogo Pref. (72) Inventor: Takahiro Matsuda 93, Edo-cho, Chuo-ku, Kobe, Hyogo Prefecture Inside Noritz Co., Ltd. 3L036 AA14

Claims (2)

[Claims] 1. A neutralization apparatus provided with a treatment tank filled with a basic neutralizing agent, an introduction pipe for introducing acidic condensed water to the treatment tank, and a drain pipe for draining treatment water from the treatment tank. ,
A neutralization device comprising: a bypass pipe that bypasses an introduction pipe and a drain pipe; a bypass pipe that mixes acidic condensed water with treated water; and a solenoid valve provided in the middle of the bypass pipe. 2. A neutralization apparatus comprising a treatment tank filled with a basic neutralizing agent, an introduction pipe for introducing acidic condensed water to the treatment tank, and a drain pipe for draining treatment water from the treatment tank. ,
A bypass pipe is provided for bypassing the introduction pipe and the drain pipe to mix the acidic condensed water with the treated water, and a flow control valve for controlling the flow rate of the condensed water is provided in the middle of the bypass pipe. Sum equipment.