JP2008070105A - Soot removing method for independent type burning and smoking furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soot removing method for an independent type burning and smoking furnace for burning the soot jetted from a small hole of a damper completely when smoking to prevent it from becoming cause of air pollution. <P>SOLUTION: Since a filter 13 made of a refractory material for letting exhaust gas containing the soot generated when smoking pass through it is provided in a bypass 10 of a main passage for exhaust gas and opening and closing devices are separately provided in the main passage and the bypass, the soot containing large particles unable to be easily burned is caught in the filter when the exhaust gas passes through the filter by closing the main passage when smoking to prevent the soot from being emitted into the atmosphere, and a part of combustion gas having high temperature at burning time passes through the filter to burn the soot caught in it so that this independent type burning and smoking furnace can be almost indefinitely used owing to its self-cleaning action. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a soot removal method for removing soot generated in a hatching process in a single firing furnace that repeats firing, hatching, and cooling steps in a furnace.

  In a conventional single-type firing hatching furnace, unburned roofing material such as unfired tiled earth is contained in the furnace body, the door is closed, the flue damper is opened, and the burner is burned to exhaust the exhaust gas from the flue. After firing the fired hatched product at a predetermined temperature while discharging, the burner is stopped and cooled to a suitable hatching temperature, and then a hydrocarbon such as LPG is put into the furnace body in a state where the flue damper is closed leaving a small hole. By filling the containing nitrifying agent together with an inert gas such as nitrogen, carbon dioxide, water vapor, etc. as necessary, carbon generated by thermal decomposition of hydrocarbons adheres to the surface of the fired hydrate and hatches, The incombustible combustible gas and soot ejected from the small hole of the damper are incinerated by the combustion flame of the burner provided in the chimney, and then the small hole of the damper is also closed and the carbon film attached to the fired silicide is below the temperature that does not oxidize To cool After adapted to unload the baked smoked product to the furnace body.

  However, it is difficult to completely incinerate large soot from the small holes of the damper at the time of hatching, and there is a problem that it may be discharged unburned from the chimney and cause air pollution. there were.

Means, actions and effects for solving the problem

  As a means for solving such a problem, the invention of claim 1 is provided with a filter made of a refractory material through which exhaust gas containing soot generated during hatching is passed in a bypass of the exhaust gas main passage. Since the switchgear is provided separately, when the main passage is closed during hatching and exhaust gas is passed through the filter, large soot that is difficult to incinerate is prevented from being captured by the filter and released into the atmosphere. The soot caught and caught by passing a part of the high-temperature combustion gas through the filter is incinerated, and can be used semipermanently by the self-cleaning action.

  During cooling, the filter is closed to prevent air from entering.

  In the invention of claim 2, in the invention of claim 1, the filter is provided integrally with the furnace body, and the exhaust gas exhausted through the filter is provided on the outlet side of the exhaust gas of the filter to burn the exhaust gas ejected from the outlet. Can be surely incinerated.

  The invention of claim 3 is the invention of claim 1, wherein the filter is provided separately from the furnace body, and the burner for incinerating the exhaust gas in the filter is provided. Further, the exhaust gas can be incinerated by the burner even when the temperature of the exhaust gas is lowered.

  The invention of claim 4 can be easily obtained in the invention of claim 1, 2 or 3, since the filter is made by crushing ceramics.

  In the first embodiment shown in FIGS. 1, 2 and 3, a chimney 3 is formed integrally with a furnace body 1 via a chimney 2, and a horizontal partition plate 4 is provided below the chimney 3. The vertical partition plate 5 is integrally formed, and the horizontal partition plate 4 is formed with a large opening 6 and a small opening 7 to form a main passage 8 that reaches the chimney 3 from the flue 2 through the large opening 6. In addition, a through-hole 9 is formed in the lower part of the vertical partition plate 5, and a bypass 10 is configured to reach the chimney 3 from the flue 2 through the through-hole 9 and the small opening 7.

  In the bypass 10, a filter 13 is configured by stacking a large number of ceramic lumps on a bottom plate 11 in which a large number of through holes 12 are formed, and a damper 14 in which a small-diameter tube 15 is fixed at the center of the small opening 7. The cap 15 is appropriately covered with the tube 15 and the large opening 6 is appropriately closed by the damper 17.

  The filter 13 has a bulk specific gravity of 0.35, a small lump size of 25 to 25 mm, a shape that is crushed at an acute angle, and a laminated thickness of 150 mm to 700 mm is appropriate. In this embodiment, the laminated thickness is 300 mm. It was.

  In addition, a burner 18 is attached to the chimney 3 so as to direct the flame upwardly from the pipe 15.

  Next, a usage example of this embodiment will be described.

  The furnace body 1 contains 2000 unfired green tile bases, the furnace door is closed, and the damper 17 of the main passage 8 and the cap 16 of the bypass 10 are removed as shown in FIG. Is fired at a predetermined temperature (for example, 1000 ° C.).

  The exhaust gas generated by the firing mainly passes through the main passage 8 and a part thereof is discharged from the chimney 3 through the bypass 10 to the atmosphere.

  When the firing is completed, the burner of the furnace body 1 is stopped, and as shown in FIG. 2, the large opening 6 of the main passage 8 is closed with a damper 17, the main passage 8 is closed, and naturally cooled to an appropriate incubation temperature (eg, 900 ° C.). Thereafter, LPG is supplied as a soot agent at a flow rate of 50 kg / h and carbon dioxide gas as a diluent gas is supplied into the furnace at a flow rate of 35 kg / h for 80 minutes.

  Exhaust gas generated at the time of hatching flows to the bypass 10 and passes through the filter 13 so that a large soot is attached and removed. Released into the atmosphere.

  When hatching is completed, the supply of the hatching agent is stopped, and the LPG gas remaining in the furnace body 1 is discharged from the bypass 10 with carbon dioxide, and then, as shown in FIG. After cooling to 450 ° C, which is a temperature at which the carbon film formed on the fired tile base is not oxidized using natural cooling or a cooling pipe (not shown), the door of the furnace body 1 is opened, and the fired and hatched roof tile is removed. Take out.

  Thus, the burning and hatching operation is completed. The soot adhering to the filter 13 is incinerated when the combustion gas having a high temperature of 650 ° C. or higher passes through the filter 13 in the baking process of the next baking and hatching operation. Therefore, the filter 13 can be used semipermanently by a self-cleaning action.

  The second embodiment of the present invention shown in FIG. 4 is applied to the case where the first embodiment cannot be applied as in an existing furnace. A bypass 22 is branched in the middle of the main passage 20 disposed between the exhaust fans 5, and a filter 26 having a burner 27 is interposed in the bypass 22. In the firing step, the first damper 21, Most of the exhaust gas generated from the furnace body when the 2 damper 23 and the third damper 24 are all opened is passed through the main passage 20, partly enters the bypass 22, passes through the filter 26, and then is exhausted to the atmosphere by the exhaust fan 25. In the hatching process, the first damper 21 is closed to shut off the main passage 20 and the second damper 23 and the third damper 24 are opened to allow the exhaust gas to pass through the filter 26 and be heated by the burner 27. Gas and fine soot are incinerated and large soot is removed by catching on the filter 26 and then discharged to the atmosphere by the exhaust fan 25. In the cooling process, the first damper 21 and the second damper 23 are closed and air enters the furnace body. To prevent it.

  Other operations are the same as those in the first embodiment, and the large soot caught on the filter 26 is incinerated in the next firing step.

It is sectional drawing of the baking process of the 1st Embodiment of this invention. It is sectional drawing of the hatching process. It is sectional drawing of the cooling process. It is outline | summary explanatory drawing of the 2nd Embodiment of this invention.

Explanation of symbols

1: Furnace 2: Chimney 3: Chimney 6: (Large) opening 7: (Small) opening 8, 20: Main passage 10 22: Bypass 13, 26: Filters 14, 17, 21, 23, 24: Damper 15 : Tube 16: Cap 18, 27: Burner

Claims (4)

A method for removing soot from a single firing incubator that repeatedly performs firing, hatching and cooling steps in the furnace body,
A filter made of a refractory material that allows exhaust gas containing soot generated at hatching to pass through is provided in the bypass of the exhaust gas main passage, and an exhaust gas switching device is separately provided in the main passage and the bypass,
By operating the switchgear, the soot trapped in the filter in the hatching step is incinerated in the next firing step.   The soot of a single-type firing incubator according to claim 1, wherein the filter is provided integrally with the furnace body, and a burner for burning the exhaust gas ejected from the outlet is provided on the exhaust gas outlet side of the filter. Removal method.   2. The soot removal method for a single firing furnace according to claim 1, wherein the filter is provided separately from the furnace body, and a burner for incinerating the exhaust gas in the filter is provided.   The method for removing soot in a single-type firing hatching furnace according to claim 1, 2 or 3, wherein the filter is obtained by crushing ceramics.

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