JP3209913B2 - Filter insulation device for refuse incinerator equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter warming apparatus for a refuse incinerator facility for feeding corrosive gas.

[0002]

2. Description of the Related Art The flue of a refuse incinerator which feeds corrosive exhaust gas containing hydrogen chloride, sulfurous acid gas or salts can be opened and closed freely.
The closing member includes a damper provided in the filter warmer.
There is an opening and closing plate. In these closure members, dew point corrosion may occur due to condensation of moisture containing corrosive components due to a temperature difference from the outside.

As a countermeasure against this, conventionally, a corrosion-resistant material such as stainless steel, nickel, a titanium alloy or FR is used.
Although the use of P or the like or the application of coating or painting has been carried out, it has not been sufficiently solved.

[0004]

SUMMARY OF THE INVENTION The present invention has the above-mentioned problems.
It is an object of the present invention to provide a filter heat retaining device for refuse incinerator equipment that solves the above.

[0005]

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is provided when the waste incinerator is stopped.
To keep the bag filter interposed in the exhaust gas duct warm
A filter insulation device for refuse incinerator equipment,
Between the downstream exhaust gas duct and the upstream exhaust gas duct
And a gas circulation duct connected to the
Circulating fan and gas heater, and the gas
Gas installed at the inlet and outlet of the circulation duct respectively
A circulation damper that can open and close the circulation duct, and an exhaust gas duct
Downstream of the inlet connection of the gas circulation duct and
Main dampers installed upstream of the mouth connection
Operating the refuse incinerator with the circulation damper
Sometimes, the gas circulation duct is closed and
An open / close plate that is heated by the heating means to a temperature higher than the dew point
Those were.

According to a second aspect of the present invention, the heating means includes:
Electric heating that is arranged in a wave pattern inside the opening and closing plate to uniformly heat the whole
It is constituted by a heater . According to the above configuration, during operation of the incinerator,
The exhaust gas temperature is about 170 ° C and the gas circulation duct
When the temperature drops to about 20 ° C, the open / close plate becomes about 95 ° C.
And dew condensation is likely to occur.
Since the heating is performed to a temperature that does not cause dew condensation, moisture containing a corrosive component does not dew, and dew point corrosion can be reliably prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, an embodiment of a filter heat retaining apparatus for a refuse incinerator according to the present invention will be described with reference to FIGS.

As shown in FIG. 3, in an exhaust gas duct 2 for exhaust gas discharged from a refuse incinerator 1, a bag filter 3 for removing dust, salts, and heavy metals contained in the exhaust gas is interposed. Through the chimney. In recent years, furnaces that stop operating at weekends or at night without assuming continuous operation are increasing. Therefore, the waste incinerator 1
To solve the problems of dew-point corrosion in the bag filter 3 due to a drop in temperature at the time of shutdown, and clogging due to deliquescence of calcium chloride due to the reaction between desalination / desulfurization material (slaked lime) and hydrogen chloride in exhaust gas. , A filter warming device 5 is provided.

That is, the filter heat retaining device 5 is branched from the downstream exhaust gas duct 2 b of the bag filter 5 and connected to the upstream exhaust gas duct 2 a of the bag filter 5.
A gas circulation duct 6 is connected, and a circulation fan 7 and a gas heater 8 are interposed. Also, at the entrance and exit of the gas circulation duct 6, circulation dampers 9a and 9 closed during operation are provided.
b are interposed respectively, and high-temperature heating gas is circulated through the bag filter 5 to prevent dew condensation. In addition, main dampers 10a and 10b that are closed when the incinerator 1 is stopped are provided on the upstream side and the downstream side of the connection portion of the gas circulation duct 6, respectively.

The circulation dampers 9a and 9b are shown in FIGS.
As shown in FIG. 2, a rotating shaft 12 that intersects the center in a cylindrical damper case 11 is rotatably supported via a bearing 13, and one end of the rotating shaft 12 reciprocates the rotating shaft 12 by 180 degrees. An actuator 14 such as an electric motor to be driven or a lever mechanism by a cylinder device is provided.
An opening and closing plate 15 for opening and closing the inside of the damper case 11 is attached to the rotating shaft 12. In this opening and closing plate 15,
An electric heater 16 for uniformly heating the whole body is provided in a waveform, and a lead wire 18 connected to an AC power supply 17 is connected to the other end of the rotating shaft 12 via a rotating connector 18a such as a slip ring. It is introduced and connected to the electric heater 16.

As shown in FIG. 4, the electric heater 16 has a pair of conductors 21 and a pair of conductors 21 fitted around a pair of conductors 21.
3 covered with a stainless steel exterior material 24 is used.

In the above configuration, when the refuse incinerator 1 is operating, the main dampers 10a and 10b are opened to circulate.
Dampers 9a and 9b are closed. The temperature of the exhaust gas introduced into the bag filter 5 and the temperature of the exhaust gas discharged therefrom are about 170 ° C. On the other hand, when the temperature of the gas circulation duct is lowered to about 20 ° C. of room temperature, the circulation dampers 9 a and 9 b The temperature of the opening / closing plate 11 becomes about 95 ° C., and the dew condensation easily occurs. However, in the present invention, since the opening / closing plate 15 is heated to about 150 ° C. by the electric heater 16, no dew condensation occurs, and dew point corrosion can be reliably prevented .

In the above configuration, the heating means is the electric heater 8, but an electric heating tube through which a heating fluid can flow can be incorporated.

[0014]

As described above, according to the first aspect of the present invention, during operation of the refuse incinerator , the waste incinerator is guided to the bag filter.
The temperature of the exhaust gas that enters and exits is about 170 ° C,
When the temperature of the ring duct is lowered to about 20 ° C,
° C and dew condensation is likely to occur.
Since the step is heated to a temperature at which dew condensation does not occur , moisture containing corrosive components does not dew, and dew point corrosion can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a filter insulation device of a refuse incinerator facility according to the present invention.
It is a front view showing an embodiment of an installation damper.

FIG. 2 is a side sectional view of the damper.

FIG. 3 is a configuration diagram showing a filter heat retaining device of the refuse incinerator facility .

FIGS. 4A and 4B are a configuration diagram and a cross-sectional view showing an electric heater incorporated in a damper, respectively.

[Description of Signs] 1 Garbage incinerator 2 Exhaust gas duct 3 Bag filter 4 Exhaust fan 5 Filter warming device 6 Gas circulation duct 7 Circulation fan 8 Electric heater 9a Circulation damper 9b Circulation damper 15 Opening / closing plate 16 Electric heater

Continuation of front page (56) References JP-A-5-157217 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23L 13/00-13/10 F23J 13/00-13 / 08

Claims (2)

(57) [Claims] (1) When the refuse incinerator is shut down, the waste gas is passed through an exhaust gas duct.
Of the waste incinerator facility that keeps the bag filter
A filter insulation device, comprising a downstream exhaust gas duct and an upstream exhaust gas duct of a bag filter.
A gas circulation duct connected between the gas circulation duct, a circulation fan
A heat heater and an inlet and an outlet of the gas circulation duct are respectively provided.
A circulation damper that can open and close the gas circulation duct, and a gas exhaust duct downstream of the inlet connection of the gas circulation duct.
Mains installed upstream and downstream of the outlet connection
And a gas damper when the waste incinerator is in operation.
Close the ring duct and use built-in heating means.
With an open / close plate that is heated above the condensation temperature
Filter insulation device for refuse incinerator equipment. 2. The heating means is arranged in a corrugated manner in the opening and closing plate.
2. A filter for refuse incinerator equipment according to claim 1 , wherein the filter is constituted by an electric heater for uniformly heating the whole.
Insulation device.