JPH08168781A - Device for neutralizing boiler waste water - Google Patents

Abstract

PURPOSE: To make a device for neutralizing a blow water discharged from a boiler simple and compact. CONSTITUTION: The blow water is neutralized with an acidic component in an exhaust gas by introducing the blow water discharged from the boiler 1 to a treating tank 3 and storing the water therein, besides taking out the exhaust gas discharged from the boiler 1 and jetting the exhaust gas from a bubbling device 3a incorporated in the treating tank 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment device for neutralizing blow water discharged from various boilers.

[0002]

2. Description of the Related Art As a device for neutralizing blow water discharged from a hot water boiler or the like, a carbon dioxide gas neutralizing device using carbon dioxide gas prepared separately in a cylinder or the like, and a blow water atomized in combustion exhaust gas. A spray-type wastewater treatment device for spraying is known.

FIG. 8 shows a known carbon dioxide neutralizing apparatus. Reference numeral 1 is a boiler device, 2 is a blow water flow passage, 3 is a blow water neutralization treatment tank, 4 is a carbon dioxide gas cylinder, 5 is a carbon dioxide gas introduction passage, and 6 is a treated blow water passage, which is discharged from the boiler device 1. Blow water is introduced from the blow water flow path 2 to the treatment tank 3 and stored therein, and mixed with the carbon dioxide gas introduced from the carbon dioxide gas cylinder 4 via the carbon dioxide gas introduction path 5 into the treatment tank 3 After the sum treatment, the treated blow water is discharged from the treated blow water channel 6 to the drainage or the secondary use facility side.

FIG. 9 shows a spray type waste water treatment device. Reference numeral 1 is a boiler device, 7 is a flue, and 8 is a blow water spray device provided in the flue 7. The blow water introduced from the boiler device 1 via the blow water flow path 2 is blow water spray. A device 8 is used to spray the flue 7 using the pressure of the high-pressure pump 9, and atomized blow water is neutralized with acidic components (carbon dioxide gas, nitrogen oxides, sulfur oxides) in the exhaust gas, and treated. The treated blow water is discharged from the treated blow water flow path 6 or is sent to the secondary use facility side.

[0005]

However, the above-mentioned known neutralization apparatus has the following drawbacks. a. In the case of the carbon dioxide neutralization processing device, the device is complicated and occupies a large area. In addition, the cost of carbon dioxide gas is newly added, and a power and electricity bill is also required. Also cylinder management,
It also requires labor such as replacement. b. In the case of spray type waste water treatment equipment, combustion exhaust gas is used for neutralization, so there is no need for carbon dioxide gas cylinders or the like, but since blow water needs to be sprayed at high pressure, a high pressure pump is required and electricity costs are reduced. It takes. Further, since the hole diameter of the spray nozzle is small, clogging is likely to occur and periodic cleaning is required.

[0006]

The present invention is proposed in order to solve the above-mentioned problems, and its constitution is as follows. 1. By blowing blow water discharged from the boiler device into the treatment tank and storing it therein, by ejecting a part of the exhaust gas taken out from the furnace of the boiler device by the furnace internal pressure from the bubbling device incorporated in the treatment tank, An apparatus for neutralizing boiler wastewater, characterized in that blow water is neutralized using acidic components in exhaust gas. 2. In the above-mentioned item 1, the apparatus for neutralizing treatment of boiler wastewater, characterized in that an open upper type treatment tank is provided at the bottom of the flue. 3. The apparatus for neutralizing boiler wastewater according to 1 or 2 above, wherein a heat exchanger is incorporated in the treatment tank, and water for supplying water to the boiler apparatus is preheated via the heat exchanger. 4. In 1), 2) or 3), a boiler drainage neutralization treatment device is provided in which a partition plate with a connecting pipe is vertically installed in a treatment tank, and a bubbling device is incorporated in each of the bottoms partitioned by the partition plate. 5. In 1 or 2 or 3 or 4, the pH in the processing tank is measured by the pH meter by mounting a pH meter in the processing tank and a control valve in the treated blow water flow path.
An apparatus for neutralizing treatment of boiler wastewater, comprising a controller for controlling the control valve to open when the value is appropriate, and to controlling the control valve to be closed when the value is inappropriate.

[0007]

Operation The blow water discharged from the boiler device is introduced into the processing tank and temporarily stored therein. On the other hand, the exhaust gas directly taken out of the furnace at the internal pressure of the furnace is jetted into the water from the bubbling device in the processing tank. As a result, the exhaust gas rising as bubbles contacts the blow water, and the alkaline blow water undergoes a neutralization reaction by the acidic components (carbon dioxide etc.) in the exhaust gas. When a heat exchanger is incorporated in the processing tank, the water preheated by this is supplied to the boiler device. When a partition plate is incorporated in the processing tank, bypass of blow water is prevented, and a stepwise neutralization process is also performed. If a pH meter is installed in the processing tank, it is prevented that the pH is drained in an inappropriate state.

[0008]

Embodiments of the present invention will be described with reference to FIG.
1 is a boiler device, 2 is a blow water flow path, 3 is a treatment tank,
6 is a treated blow water flow path, 7 is a flue, and 10 is an exhaust introduction line that connects the exhaust outlet 10a of the boiler device 1 and the bubbling device 3a in the processing tank 3. In the case of the above-mentioned embodiment, the blow water generated in the boiler device 1 is introduced from the blow water flow path 2 into the processing tank 3 and temporarily stored therein. On the other hand, a part of the exhaust gas taken out from the boiler device 1 by the internal pressure of the furnace is guided from the exhaust gas introduction line 10 to the bubbling device 3a in the processing tank 3 and jetted into the blow water from here. The ejected exhaust gas rises like bubbles in the blow water, and during that time, acidic components such as carbon dioxide, nitrogen oxides, and sulfur oxides in the exhaust gas contact alkaline blow water to neutralize it. To do. The treated blow water is discharged from the treated blow water flow path 6.

In FIG. 2, a horizontal plate 12 is arranged stepwise above the bubbling device 3a in the processing tank 3 so that the contact area of bubbles and blow water and the time are kept long to promote the neutralization reaction. FIG. 3 shows an example in which the plate-like plate 13 is arranged downward in a stepwise manner so that bubbles are accumulated in the plate-like plate 13 and the contact area between the bubbles and blow water and the time are kept long. is there.

In FIG. 4, an upper open type treatment tank 3 is arranged at the bottom of the flue 7, and blow water is introduced from the blow water flow path 2 to the treatment tank 3 and temporarily stored therein, and the exhaust gas taken out from the boiler device 1 is exhausted there. Is another embodiment configured to bubble.

In FIG. 5, a heat exchanger 14 is incorporated in the treatment tank 3, an inlet side 15 of the heat exchanger 14 is connected to tap water or a water tank, and an outlet side 16 is connected to a water supply port of the boiler apparatus 1. This is an embodiment in which the water in the processing tank 3 is preheated before it is supplied to the boiler device 1 to save energy.

In FIG. 6, a vertical partition plate 17 having a communication conduit 18 formed therein is installed in the processing tank 3, and bubbling devices 3a are installed in the bottom of the partition plate 17, respectively. This is an example in which the neutralization is carried out and the untreated water is prevented from being drained by a short path.

In FIG. 7, a pH meter 19 is attached to the treatment tank 3 and a control valve 6a is attached to the treated blow water flow passage 6 to constantly monitor the pH of the blow water in the treatment tank 3.
When this pH is a specified value, the controller 20 determines that it is appropriate and controls the control valve 6a to open, and when it is out of the specified value, it is determined to be unsuitable and controls the control valve 6a to close, and the processing tank 3 When the water is full, the untreated water is guided from the untreated water flow path 21 to the other waste water treatment device 22 and neutralized there to prevent the risk of being drained without being neutralized. This is an example. As the other wastewater treatment device 22 referred to here, for example, a known treatment device shown in FIG. 8 or 9 can be used. In the above embodiment, the embodiments of FIGS. 2, 3, 5, 6 and 7 are implemented individually in combination with the embodiment of FIG. 1 at the stage of practical application. It may be implemented in combination in multiple ways.

[0014]

The effects of the present invention are as follows. a. Since the exhaust gas discharged from the boiler device is used as the neutralizing agent, it is not necessary to prepare a new gas such as carbon dioxide gas. b. The ejection hole of the bubbling device does not need to have a fine accuracy, as long as it can discharge the exhaust gas. Further, cleaning after installation is less than that of the conventional blow water spray device (nozzle). Further, compared with the spray type, no power unit is required. Therefore, the device is simple, inexpensive and space-saving. c. By increasing the amount of exhaust gas taken out of the boiler device, it is easy to increase the wastewater treatment capacity. It is also possible to collectively neutralize the wastewater of other boilers. d. If a processing tank (processing section) is installed at the bottom of the flue,
Normal exhaust air coming out of the flue also contacts the surface of the blow water, so it is possible to further neutralize and the exhaust air after bubbling can be combined with the normal exhaust air and discharged, so the equipment is simple. . e. Energy saving can be achieved by incorporating a heat exchanger in the treatment tank and preheating the water supply to the boiler device.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a neutralization processing device according to the present invention.

FIG. 2 is an explanatory diagram of an embodiment in which a horizontal plate is arranged in the processing tank.

FIG. 3 is an explanatory view of an embodiment in which a dish-shaped plate is arranged in the processing tank.

FIG. 4 is an explanatory view of an embodiment in which a processing tank is provided at the bottom of a flue.

FIG. 5 is an explanatory diagram of an embodiment in which a heat exchanger for preheating feed water is incorporated in a processing tank.

FIG. 6 is an explanatory view of an embodiment in which a partition plate is provided in the processing tank to perform neutralization stepwise.

FIG. 7 is an explanatory view of an embodiment in which a pH meter is installed in the treatment tank to prevent drainage of blow water that is not neutralized.

FIG. 8 is an explanatory view of a conventional carbon dioxide gas neutralization device.

FIG. 9 is an explanatory diagram of a conventional spray-type wastewater treatment device.

[Explanation of symbols]

 1 Boiler Device 2 Blow Water Flow Path 3 Treatment Tank 3a Bubbling Device 6 Treated Blow Water Flow Path 6a Control Valve 7 Flue 10 Exhaust Inlet Line 10a Exhaust Outlet 12 Side Plate 13 Plate 14 Heat Exchanger 15 Inlet 16 Outlet 17 Partition Plate 18 Communication Pipeline 19 pH Meter 20 Controller 21 Untreated Water Flow Path 22 Other Wastewater Treatment Equipment

Continuation of front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI technical display location C02F 1/66 P F22B 37/54 B

Claims (5)

[Claims] 1. A bubbling device in which blow water discharged from a boiler device is introduced into a treatment tank and stored therein, and a part of exhaust gas taken out from the furnace of the boiler device by internal pressure of the boiler is incorporated in the treatment tank. An apparatus for neutralizing boiler wastewater, characterized by performing blowout to neutralize blow water using acidic components in exhaust gas. 2. The apparatus for neutralizing treatment of boiler wastewater according to claim 1, wherein an upper open type treatment tank is provided at the bottom of the flue. 3. The boiler drainage according to claim 1, wherein a heat exchanger is incorporated in the treatment tank, and water for supplying water to the boiler device is preheated via the heat exchanger. Neutralization processing device. 4. The boiler drainage according to claim 1, 2 or 3, wherein a partition plate with a connecting pipe is vertically installed in the processing tank, and a bubbling device is incorporated in each bottom part partitioned by the partition plate. Japanese processing equipment. 5. The method according to claim 1, 2 or 3 or 4,
When a pH meter is attached to the treatment tank and a control valve is attached to the treated blow water flow path, and the pH value in the treatment tank measured by the pH meter is appropriate, the control valve is controlled to be open, which is unsuitable. In some cases, a boiler drainage neutralization treatment device that is equipped with a control device that controls it to be closed.