KR100567910B1 - Appratus for perfect combustion of exhaust gas of direct fired furnace - Google Patents

Abstract

The present invention is to provide a complete combustion apparatus for the combustion of the exhaust gas to prevent environmental pollution since the exhaust gas discharged from the direct combustion furnace is completely burned and discharged into the atmosphere.

Accordingly, the present invention is a direct combustion exhaust gas combustion device for completely burning the exhaust gas discharged from the direct combustion furnace, the waste heat furnace in which the exhaust gas discharged from the direct combustion furnace is installed in communication with the direct combustion furnace; An air inlet unit for supplying air into the waste heat furnace to completely burn the exhaust gas introduced into the waste heat furnace; An ignition unit installed in the waste heat furnace to ignite the exhaust gas in the waste heat furnace; It provides a direct combustion exhaust gas combustion device comprising a control means for controlling the air inlet portion to completely burn the exhaust gas introduced into the waste heat furnace.

Waste heat furnace, direct fire furnace, air inlet, purge means

Description

Direct combustion furnace exhaust gas burner {APPRATUS FOR PERFECT COMBUSTION OF EXHAUST GAS OF DIRECT FIRED FURNACE}

1 is a partial cutaway perspective view showing a direct combustion exhaust gas combustion device according to the present invention.

2 is a view showing a direct combustion exhaust gas combustion device ignition unit according to the present invention.

Figure 3 is a control flow diagram showing the operation of the combustion gas complete combustion apparatus of the direct flame according to the present invention.

Figure 4 schematically shows a direct section of the hot-dip plating equipment according to the prior art.

<Description of Symbols for Main Parts of Drawings>

10: waste heat furnace 12: direct furnace

14: connector 16: discharge pipe

18: air blower 20: air inlet

22: air pipe 24: air inlet pipe

26: air valve 28: flow control valve

30: ignition unit 34: igniter

40: carbon monoxide analyzer 42: oxygen correction analyzer

44: temperature sensor 46: control panel

50: purge air inlet pipe 52: purge valve

S: strip

The present invention relates to a direct combustion apparatus for completely burning exhaust gas discharged from a direct combustion furnace, and more particularly, to completely discharge exhaust gas containing carbon monoxide discharged from a direct combustion furnace and then discharge it to the outside. Direct combustion furnace exhaust gas combustion device.

In general, since the strip is oxidized and corroded in the atmosphere, a plating method of plating the surface of the strip is mainly used to improve corrosion resistance of the steel sheet.

In this plating method, electroplating a metal salt containing metal ions to be plated to plate the surface of the steel sheet, and after melting the metal to be plated, the strip is passed through a crucible in which the melt is melted to plate the surface of the strip. It can be divided into hot dip plating.

Especially in hot dip plating, the cleanliness and temperature of the strip surface are the most important factors that determine the adhesion of the plating.

Therefore, in the hot-dip galvanizing facility, in addition to the pretreatment unit for washing the strip to remove the rolled oil, a fire furnace for burning and removing the rolled oil remaining on the strip is installed.

The direct furnace of the hot-dip galvanizing facility according to the prior art as shown in FIG. 4 is inserted into the furnace 100, the burner 102 on the surface while passing through the furnace 100. The flame is sprayed to burn the rolled oil on the surface.

Exhaust gas generated by the burned rolling oil is discharged to the outside through the discharge pipe (104).

At this time, the exhaust gas blower 106 is installed at the end of the discharge pipe 104 so as to smoothly discharge the discharge gas to form a negative pressure inside the discharge pipe 104.

In addition, the discharge pipe 104 is provided with a pressure adjusting damper 108 to adjust the pressure in the discharge pipe 104.

On the other hand, the burner 102 installed inside the direct flame furnace 100 mixes air and coke oven gas (COG gas) to form a flame, and sprays the formed flame on the surface of the strip (S). Therefore, to remove the rolling oil on the strip (S) surface.

However, since the inside of the furnace 100 is heated at a high temperature, the strip S charged in the furnace 100 is formed with an oxide scale on the surface of the strip S. Degradation of the adhesion causes the plating to peel off after cooling.

Therefore, the mixing ratio of the COG gas and air increased the ratio of the COG gas than the mixing ratio for the complete combustion in order to maintain the interior of the flame furnace 100 as a reducing component crisis to form a flame with a rich mixing ratio.

The flame formed as described above has a problem that a large amount of carbon monoxide is generated due to incomplete combustion, and the generated carbon monoxide is discharged into the atmosphere to pollute the environment.

Accordingly, the present invention has been made to solve the problems of the prior art, the object of the present invention is to completely burn the exhaust gas discharged from the direct combustion furnace to discharge into the atmosphere to provide a complete combustion apparatus for the direct combustion exhaust gas to prevent environmental pollution. .

In order to achieve the object as described above, the present invention, in the direct combustion furnace exhaust gas combustion device for completely burning the exhaust gas discharged from the direct combustion furnace, the exhaust gas discharged from the direct combustion furnace is installed in communication with the direct flame furnace Waste heat furnace; An air inlet unit for supplying air into the waste heat furnace to completely burn the exhaust gas introduced into the waste heat furnace; An ignition unit installed in the waste heat furnace to ignite the exhaust gas in the waste heat furnace; It provides a direct combustion exhaust gas combustion device comprising a control means for controlling the air inlet portion to completely burn the exhaust gas introduced into the waste heat furnace.

The strip here preferably penetrates the interior of the waste heat furnace to preheat the strip prior to entering the furnace.

In addition, the air inlet is installed in the waste heat furnace and is installed in the air pipe having a plurality of nozzles on the circumferential surface, the air inlet pipe is connected to the air pipe to supply air to the air pipe, the air inlet pipe is installed in the air pipe It is preferable that the air valve for opening and closing the flow of air, the flow inlet valve is installed in the air inlet pipe to adjust the flow rate of air flowing into the air pipe.

Here, the air pipe is preferably installed to face both sides of the strip.

In addition, the control means includes a carbon monoxide analyzer for detecting the carbon monoxide concentration of the exhaust gas supplied to the furnace, an oxygen correction analyzer for detecting the amount of air required for complete combustion by detecting the carbon monoxide concentration inside the waste heat furnace, and a temperature inside the waste heat furnace. It is preferable that the control panel to control the air inlet by calculating the signal transmitted from the temperature sensor, the carbon monoxide analyzer and the oxygen correction analyzer and the temperature sensor.

On the other hand, it is more preferable to include a purge means consisting of a purge valve which is connected to the purge air inlet pipe is installed in the air pipe, the purge air inlet pipe to open and close the flow of the purge air flowing into the air pipe.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a partial cutaway perspective view showing a direct combustion exhaust gas combustion device according to the present invention, Figure 2 is a view showing a direct combustion exhaust gas combustion device ignition unit according to the present invention.

Complete combustion device of the direct combustion furnace exhaust gas according to an embodiment of the present invention has a waste heat furnace.

The waste heat furnace 10 is provided with a connection pipe 14 communicating with the direct fire furnace 12 to one side, and the exhaust gas discharged from the direct fire furnace 12 through the connection pipe 14 is a waste heat furnace 10. Flows into).

In addition, the strip (S) entering the direct furnace 12 is installed and preheated to pass along the axial direction of the waste heat furnace 10 before entering the direct furnace 12.

On the other hand, since the exhaust gas inside the direct fire furnace 12 has a small specific gravity and rises, the connection pipe 14 communicating with the direct fire furnace 12 is preferably installed at the upper portion of the direct fire furnace 12.

In addition, a discharge pipe 16 for discharging the exhaust gas with waste heat completely burned from the waste heat furnace 10 is installed at the lower end of the waste heat furnace 10, and an air blower 18 is installed at the tip of the discharge heat pipe 16. A negative pressure is formed inside the discharge pipe 16 to discharge the exhaust gas completely burned out from the waste heat furnace 10 to the outside.

Next, the air inlet part 20 includes an air pipe 22 for supplying air to the waste heat furnace 10 to completely burn the exhaust gas, and an air inlet pipe 24 for introducing air into the air pipe 22. , The air valve 26 for opening and closing the air flow of the air inlet pipe 24, the flow control valve 28 for adjusting the flow rate of the air flowing into the air inlet pipe 24, and the waste heat furnace 10. It consists of an ignition unit 30 for igniting the exhaust gas.

The air pipes 22 are installed in pairs so as to face both sides of the strip S passing through the waste heat path 10, and a plurality of nozzles 22a are formed on the circumferential surface thereof.

In addition, the air pipe 22 is installed in the air inlet pipe 24 through which the air flows to one side, the air inlet pipe 24 is an air valve for opening and closing the flow of air supplied to the air pipe 22 ( 26) is installed.

The air valve 26 is a shut off valve for opening and closing the flow of air.

In addition, the air inlet pipe 24 at the rear end of the air valve 26 is provided with a flow rate control valve 28 for adjusting the flow rate of the air supplied to the air inlet pipe 24.

On the other hand, the air valve 26 and the flow control valve 28 are controlled by the control means described later in accordance with the state inside the waste heat path (10).

The ignition unit 30 includes an ignition pipe 32 for supplying air and combustion gas, and an igniter 34 for igniting a mixture of combustion gas and air supplied to the ignition pipe 32.

The ignition pipe 32 is installed to protrude to the inside of the waste heat path 10, one side of the ignition pipe 32, the combustion gas inlet pipe 36 to which the combustion gas is supplied and the air so that the combustion gas can be burned The supplied ignition air inlet pipe 38 is installed in communication.

In addition, the ignition air inlet pipe 38 and the combustion gas inlet pipe 36 is provided with an on-off valve 39 to open and close the flow of the ignition air and the combustion gas supplied to each inlet pipe (36, 38).

On the other hand, the tip of the ignition pipe 32 is preferably located in the center of the waste heat furnace 10 so that the flame nuclei can be uniformly propagated in each direction inside the waste heat furnace 10 after the flame nucleus is formed.

 The igniter 34 is installed around the tip of the ignition pipe 32 to apply electricity, thereby generating an electric spark to ignite the mixture of combustion gas and air discharged from the ignition pipe 32.

Here, the on-off valve 39 and the igniter 34 are controlled by the control means mentioned later.

Next, the control means is a carbon monoxide analyzer 40 for detecting the carbon monoxide concentration of the exhaust gas supplied to the waste heat furnace 10, the oxygen correction analyzer for analyzing the amount of air required for complete combustion by detecting the carbon monoxide concentration in the waste heat furnace 10 (42), the air inflow is calculated by calculating the signal transmitted from the temperature sensor 44, the carbon monoxide analyzer 40 and the oxygen correction analyzer 42 and the temperature sensor 44 to detect the temperature inside the waste heat furnace (10) It consists of a control panel 46 to control the unit (20).

3 is a control flow chart of a direct combustion exhaust gas combustion device according to the present invention.

The carbon monoxide analyzer 40 is installed in the connecting pipe 14 which connects the direct fire furnace 12 and the waste heat furnace 10 to detect the carbon monoxide concentration of the exhaust gas supplied from the direct fire furnace 12 to the waste heat furnace 10. Transfer to control panel 46.

The oxygen correction analyzer 42 detects the oxygen concentration in the waste heat furnace 10, analyzes the amount of air necessary to completely burn the exhaust gas in the waste heat furnace, and transmits the analyzed air amount to the control panel 46.

The temperature sensor 44 is installed inside the waste heat furnace 10 to sense the temperature inside the waste heat furnace 10 and transmits the temperature to the control panel 46.

The control panel 46 calculates a signal transmitted from the carbon monoxide analyzer 40, the oxygen correction analyzer 42, and the temperature sensor 44 to control the air inlet 20.

Herein, the control panel 46 opens the air valve 26 when the concentration of the carbon monoxide detected from the carbon monoxide analyzer 40 exceeds a predetermined reference value and opens the waste heat furnace through the air inlet pipe 24 and the air pipe 22. 10) Air is introduced into the interior.

In addition, if the oxygen concentration inside the waste heat furnace 10 detected by the oxygen correction analyzer 42 is less than the amount of oxygen required to completely burn the exhaust gas discharged from the waste heat furnace 10, the flow rate control valve 28 is adjusted to control the waste heat furnace. Adjust the amount of air supplied to (10).

In addition, when the temperature inside the waste heat furnace 10 detected by the temperature sensor 44 is greater than the ignition temperature, the open / close valve 39 is opened and electric ignition is applied to the igniter 34 to generate an electric spark. 10) Ignite the gas inside.

The purge means is installed in the purge air inlet pipe 50 and the purge air inlet pipe 50 for introducing the purge air into the air pipe 22 purge valve for opening and closing the flow of the purge air flowing into the air pipe 22 ( 52).

The purge air inlet pipe 50 communicates with one side of the air pipe 22 to purge the air pipe 22 and the waste heat passage 10 when the air valve 26 is closed.

The purge valve 52 provided in the purge air inlet pipe 50 opens and closes the flow of the purge air flowing into the air pipe 22.

On the other hand, since the waste heat furnace 10 passes a strip of high temperature, when combustion does not occur inside the waste heat furnace 10, the purge air should be supplied to the waste heat furnace 10 to prevent the strip from being oxidized.

Therefore, since the purge air is supplied into the waste heat path 10 through the air pipe 22, the strip S is prevented from being oxidized.

At this time, as the gas used for the purge air, it is preferable to use a fluorinated gas such as argon, but it is also possible to use a chemically stable and inexpensive nitrogen.

The operation of the direct combustion exhaust gas combustion device according to the present invention as follows.

The exhaust gas discharged from the direct flame furnace 12 contains a large amount of carbon monoxide due to the rich mixing ratio in the direct flame furnace 12.

The unburned exhaust gas is introduced into the waste heat furnace 10 through the connecting pipe 14, and the exhaust gas flowing into the waste heat furnace 10 is continuously measured by the carbon monoxide analyzer 40. .

At this time, when the carbon monoxide concentration exceeds the reference value, the air inlet 20 is operated.

When the air inlet 20 is operated, the amount of air required for complete combustion is analyzed according to the carbon monoxide concentration detected by the oxygen correction analyzer 42, and the flow control valve 28 is adjusted according to the analyzed air amount to control the waste heat furnace 10 Adjust the amount of air supplied to).

At this time, when the temperature inside the waste heat furnace 10 is higher than the ignition temperature, the air valve 26 is opened to supply air to the air pipe 22 and the ignition unit 30 is operated to discharge the waste heat furnace 10. Burn the gas.

In addition, when the temperature inside the waste heat furnace 10 is less than the ignition temperature, the air valve 26 is shut off and the purge valve 52 is opened to purge the air pipe 22 and the inside of the waste heat furnace 10.

Meanwhile, when the temperature inside the waste heat furnace 10 is continuously measured and the temperature inside the waste heat furnace 10 rises above the ignition temperature, the purge valve 52 is blocked and the air valve 22 is opened to open the air pipe ( Air is introduced into 22 and at the same time operating the ignition unit 30 to ignite the waste heat furnace (10).

As described above, the carbon monoxide concentration of the exhaust gas discharged from the direct combustion furnace 12 and the oxygen concentration in the waste heat furnace 10 and the temperature in the waste heat furnace 10 are continuously measured to control feedback.

The combustion furnace exhaust gas complete combustion device according to the present invention as described above is completely discharged by the exhaust gas to prevent environmental pollution.

In addition, the preheating of the strip by burning unburned exhaust gas improves the thermal efficiency of the direct combustion furnace.

In addition, since the thermal efficiency is excellent, the time required to raise the atmosphere temperature can be reduced, thereby improving productivity.

Claims (7)

In the direct combustion furnace exhaust gas combustion device for completely burning the exhaust gas discharged from the direct combustion furnace for burning the rolling oil remaining on the strip, A waste heat furnace in which a connection pipe into which the discharge gas discharged from the direct furnace flows and a discharge pipe through which the completely burned discharge gas is discharged are installed, and through which the strip passes; It is installed inside the waste heat path so as to face both sides of the strip, a pair of air supplied to completely burn the exhaust gas through a plurality of nozzles formed on the circumferential surface and a purge air to prevent oxidation of the strip Air pipes; An ignition unit installed inside the waste heat furnace to ignite the exhaust gas; And controlling means for controlling the flow of the purge air and the amount of air supplied through the air pipe by analyzing the temperature and the oxygen concentration inside the waste heat furnace and the carbon monoxide concentration of the exhaust gas flowing through the connecting pipe. Combustion gas complete combustion device by fire. The method of claim 1, And the strip is preheated in the waste heat furnace, and the combustion furnace exhaust gas complete combustion device, characterized in that flowing into the furnace. The method of claim 1, An air inlet pipe communicating with the air pipe and supplying air to the air pipe, An air valve installed in the air inlet pipe to open and close the flow of air supplied to the air pipe; It is installed in the air inlet pipe further comprising a flow control valve for regulating the amount of air supplied to the air pipe exhaust furnace exhaust gas combustion device characterized in that it further comprises. delete The method of claim 1, The control means is a temperature sensor for sensing the temperature inside the waste heat, Oxygen correction analyzer for detecting the oxygen concentration inside the waste heat, Carbon monoxide analyzer for detecting the carbon monoxide concentration of the exhaust gas, Comprising a control panel for controlling the flow of the air amount and the purge air by calculating the signals transmitted from the temperature sensor, the oxygen correction analyzer and the carbon monoxide analyzer. The method of claim 1, A purge air inlet pipe communicating with the air pipe and supplying the purge air to the air pipe, It is installed on the purge air inlet pipe further comprises a purge valve exhaust gas combustion device further comprises a purge valve for opening and closing the flow of the purge air. The method of claim 1, The control means supplies air through the air pipe when the temperature inside the waste heat furnace is higher than the ignition temperature and operates the ignition unit to combust the exhaust gas. If the internal temperature of the waste heat furnace is less than the ignition temperature, the combustion of the combustion gas exhaust gas burner, characterized in that the supply of the air is cut off and supplying the purge air through the air pipe.

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