JPH05288333A - Device for preventing white smoke from waste incinerator - Google Patents

Abstract

PURPOSE:To mix and agitate exhaust gas and heated air efficiently so as to suppress generation of white smoke emitted from a chimney. CONSTITUTION:The subject relates to a device for eliminating white smoke from exhaust gases emitted from the chimney 14 of a waste incinerator 10. In an exhaust gas passageway 15 from the waste incinerator 10 to the chimney a heat exchanger 11 is provided as a means for heat exchange between the exhaust gases discharged from the waste incinerator 10 and air from the outdoors. Downstream from the heat exchanger 11 a mixing device 13 is interposed as a means for mixing the heated air resulting from the heat exchange by the heat exchanger 11 with the exhaust gases from the waste incinerator 10. A low-frequency generator 20 is connected to the mixing device 13 as a means for irradiating the air taken in from the outdoors with a low-frequency and sending it into the mixing device 13 to mix and agitate the heated air and the exhaust gases efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a white smoke prevention device for a refuse incinerator for eliminating white smoke of exhaust gas discharged from a chimney of an urban refuse incinerator, for example.

[0002]

2. Description of the Related Art A conventional white smoke preventive device for a refuse incinerator will be described below with reference to the drawings. FIG. 2 is a schematic view of a white smoke prevention device of a conventional refuse incinerator. In FIG. 2, reference numeral 1 denotes a refuse incinerator, a drying zone, a combustion zone and a post-combustion zone are formed by a stoker inside the combustion chamber 1A, and a hopper 1B and a hopper are provided on one side of the combustion chamber 1A. Outlet 1C on the other side
Is provided. A secondary combustion chamber 2 for burning unburned gas is provided above the combustion chamber 1A. An exhaust port 3 is provided in the secondary combustion chamber 2, and the exhaust port 3 and the chimney 4 are provided.
A heat exchanger 5, a bag filter 6, and a mixer 7 are installed between them and are connected by an exhaust passage 8.

The heat exchanger 5 is a device for exchanging heat between the high temperature exhaust gas discharged from the refuse incinerator 1 and the air from the outside air blown from the blower 9. The heated heated air is sent to the mixer 7.

The bag filter 6 provided adjacent to the heat exchanger 5 is a device for removing dust in the exhaust gas discharged from the refuse incinerator 1. Further, on the downstream side of the bag filter 6, there is provided a mixer 7 for mixing the heated air heated by the heat exchanger 5 as described above and the exhaust gas from which dust has been removed by the bag filter 6. .. The chimney 4 is installed on the downstream side of the mixer 7 in order to discharge the exhaust gas discharged from the mixer 7 to the outside air.

The above-mentioned conventional refuse incinerator 1 has a hopper 1B.
The dust thrown in is burned in the combustion chamber 1A by the supply of air. The exhaust gas generated by the combustion of dust passes from the secondary combustion chamber 2 through the exhaust passage 8 and the heat exchanger 5
Flow into. In the heat exchanger 5, heat is exchanged between the air from the outside air sent from the blower 9 and the high-temperature exhaust gas exhausted from the secondary combustion chamber 2, and the air from the blower 9 becomes heated air. And is sent into the mixer 7. On the other hand, the exhaust gas that has passed through the heat exchanger 5 has dust and the like removed by the bag filter 6, is introduced into the mixer 7, and is mixed with the heated air that has passed through the heat exchanger 5. In this way, by mixing the exhaust gas and the high-temperature heated air to raise the temperature of the exhaust gas, the saturation amount of water vapor in the exhaust gas is increased, and the humidity of the exhaust gas is lowered and the white smoke is generated by discharging the smoke from the chimney 4. It was suppressed.

[0006]

However, as described above, in the conventional white smoke prevention device for the refuse incinerator, the exhaust gas is discharged from the chimney unless the exhaust gas and the heated air are efficiently mixed and stirred in the mixer 7. In some cases white smoke is generated. However, there is a problem that the exhaust gas and the heated air are not easily and efficiently mixed and stirred in a normal state.

The present invention has been made to solve the above-mentioned conventional problems, and is directed to a waste incinerator that suppresses the generation of white smoke exhausted from a chimney by effectively mixing and stirring exhaust gas. It is intended to provide a white smoke prevention device.

[0008]

A white smoke prevention device for a dust incinerator according to the present invention is a white smoke prevention device for a dust incinerator for eliminating white smoke of exhaust gas discharged from a chimney of the dust incinerator.
A heat exchanger for exchanging heat between the exhaust gas discharged from the waste incinerator and the air from the outside air is provided in the exhaust passage from the waste incinerator to the chimney, and the heated air and the waste incinerator heat-exchanged by this heat exchanger. A mixer that mixes with the exhaust gas from the heat exchanger is placed downstream of the heat exchange, and at least one of the air taken in from the outside air or the heated air that has passed through the heat exchanger is irradiated with a low frequency wave. A low frequency generator for feeding into is provided in communication with the mixer.

[0009]

With the above structure, the low frequency generator applies a low frequency to at least one of the air from the outside air and the heated air that has passed through the heat exchanger, so that the air receives the low frequency energy and the low frequency is applied. Turns into vibrating air. By sending this low-frequency air into the mixer, the mixing and stirring effect of the exhaust gas and the heated air that has passed through the heat exchanger is improved, and the exhaust gas and the heated air are completely mixed,
Generation of white smoke can be suppressed by increasing the temperature of the exhaust gas, increasing the saturation amount of water vapor, and decreasing the humidity.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of a white smoke prevention device for a refuse incinerator according to an embodiment of the present invention. The white smoke prevention device of the refuse incinerator of this embodiment has the same basic configuration as the conventional refuse incinerator, the refuse incinerator 10, the heat exchanger 11, the bag filter 12,
A mixer 13 and a chimney 14 are installed in series and communicate with each other through an exhaust passage 15. Furthermore, to explain this basic configuration in detail, an exhaust port 17 is provided in the secondary combustion chamber 16 of the refuse incinerator 10, and the exhaust port 17 and the heat exchanger 11 communicate with each other via the exhaust passage 15. There is. The heat exchanger 11 is a device for exchanging heat between the high-temperature exhaust gas discharged from the refuse incinerator 10 and the air from the outside air sent from the blower 18. The heated air heated by the heat exchanger 11 is sent to the mixer 13.
Further, a bag filter 12 is installed on the downstream side of the heat exchanger 11 to remove dust in the exhaust gas discharged from the waste incinerator 10. In addition, a heat exchanger is provided downstream of the bag filter 12.
A mixer 13 for mixing the heated air heated by 11 and the exhaust gas from which dust has been removed by the bag filter 12 is installed,
Further, a chimney 14 is provided for discharging the exhaust gas passing through the mixer 13 to the outside air.

The difference between this embodiment and the conventional example is that the blower is
A low frequency generator 20 for irradiating the air taken in from the outside air by 19 with a low frequency and sending it into the mixer 13 is installed in communication with the mixer 13. The low frequency generator 20 is a device for generating a low frequency of 10 Hz to 20 Hz, and a known low frequency device is already used. By applying a low frequency to the air by the low frequency generation device 20, this air receives low frequency energy and vibrates, and becomes air of low frequency vibration. By feeding this low-frequency air into the mixer 13, the effect of mixing and stirring the exhaust gas and the heated air that has passed through the heat exchanger 11 is enhanced.

The operation of the above configuration will be described below. In this embodiment, the flow of exhaust gas is the same as in the conventional example. That is, the exhaust gas generated in the combustion chamber 21 flows into the heat exchanger 11 from the secondary combustion chamber 16 through the exhaust passage 15. In the heat exchanger 11, heat is exchanged between the outside air sent from the blower 18 and the high-temperature exhaust gas discharged from the secondary combustion chamber 16, and the air from the blower 18 becomes heated air. And is sent into the mixer 13. The exhaust gas that has passed through the heat exchanger 11 has dust and the like removed by the bag filter 12, is introduced into the mixer 13, and is mixed with the heated air that has passed through the heat exchanger 11. And, originally, the exhaust gas and the heated air do not mix very efficiently, but by blowing the low-frequency air that has passed through the low-frequency generator 20 into the mixer 13, the exhaust gas and the heated air are effectively oscillated by the low-frequency vibration. Mix and stir. For this reason, the temperature of the exhaust gas rises and the amount of water vapor saturation increases, and the humidity of the exhaust gas is lowered to suppress the generation of white smoke discharged from the chimney 14.

In the above embodiment, the air from the outside air is irradiated with a low frequency to be sent into the mixer 13 to enhance the mixing / stirring effect of the exhaust gas and the heated air, but the heated air itself is passed through the low frequency generator. Needless to say, the heating air may be made into low-frequency air so that it can be effectively mixed and stirred with the exhaust gas.

In the above embodiment, the inside of the combustion chamber is composed of the dry zone, the combustion zone and the post-combustion zone, and the refuse incinerator for incinerating the waste while conveying it from the hopper side to the discharge side is explained. Is not limited to this type of refuse incinerator.

[0015]

As described above, according to the present invention, with the above-described structure, the effect of mixing and stirring the exhaust gas and the heated air that has passed through the heat exchanger is enhanced, and the exhaust gas and the heated air are completely mixed, The generation of white smoke discharged from the chimney can be suppressed.

[Brief description of drawings]

FIG. 1 is a schematic view of a white smoke prevention device of a refuse incinerator according to an embodiment of the present invention.

FIG. 2 is a schematic view of a white smoke prevention device of a conventional refuse incinerator.

[Explanation of symbols]

 10 Waste Incinerator 11 Heat Exchanger 12 Bag Filter 13 Mixer 14 Chimney 15 Exhaust Passage 20 Low Frequency Generator

Claims (1)

[Claims] 1. A white smoke prevention device for a dust incinerator for eliminating white smoke of exhaust gas discharged from a chimney of the dust incinerator,
A heat exchanger for exchanging heat between the exhaust gas discharged from the waste incinerator and the air from the outside air is provided in the exhaust passage from the waste incinerator to the chimney, and the heated air and the waste incinerator heat-exchanged by this heat exchanger. A mixer that mixes with the exhaust gas from the heat exchanger is placed downstream of the heat exchange, and at least one of the air taken in from the outside air or the heated air that has passed through the heat exchanger is irradiated with a low frequency wave. A device for preventing white smoke in a refuse incinerator, characterized in that a low-frequency generator for feeding into the interior is provided in communication with the mixer.