KR101357541B1 - Treating apparatus for waste gas in sintering machine and control method thereof - Google Patents

Abstract

The present invention relates to a waste gas treatment apparatus for a sintering machine, and more particularly, to a waste gas treatment apparatus for a sintering apparatus that can improve the regeneration efficiency of activated carbon for removing SOX, NOX components from the exhaust gas.
The present invention, the adsorption unit for removing the SOx and NOx contained in the gas discharged from the sintering machine; A supply flow meter for measuring the flow rate of the exhaust gas supplied to the adsorption unit; An exhaust flow meter for measuring the flow rate of the exhaust gas and the byproduct from the adsorption unit; And when the difference between the flow rate measured in the supply flowmeter and the flow rate measured in the discharge flowmeter is provided a discharge gas treatment apparatus for a sintering machine comprising a control unit for adjusting the temperature, pressure and catalyst supply in the adsorption unit.

Description

Emission gas treatment device for sintering machine and its control method {TREATING APPARATUS FOR WASTE GAS IN SINTERING MACHINE AND CONTROL METHOD THEREOF}

The present invention relates to an apparatus for treating exhaust gas for a sintering machine and a control method thereof, and in particular, to suppress the generation of by-products such as condensate and salt generated in the adsorption unit, and to improve the adsorption efficiency of SOX and NOX components. A processing apparatus and a control method thereof.

Typical steelmaking consists of a steelmaking process to produce molten iron, a steelmaking process to remove impurities from molten iron, a casting process to solidify the liquid iron, and a rolling process to make iron steel or wire.

The casting process is a process in which liquid molten steel is injected into a mold and then cooled and solidified while passing through a continuous casting machine to continuously produce an intermediate material such as a slab or a bloom.

In this process, the bloom is converted into a billet (Billet) again through a rolling mill, and processed into a wire rod through a wire mill.

Further, the slab is produced as a heavy plate through a plate rolling mill or as a hot rolled coil or a hot rolled steel plate while passing through a hot rolling mill.

The steelmaking process for producing molten iron may be performed by a blast furnace for producing molten iron from iron ore, and charged with coke and sintered raw material dried in the coke oven into the sintering process to produce a sintered ore charged in the blast furnace.

The exhaust gas generated in the sintering machine passes through the exhaust gas treatment device for sintering to remove the SOx component and the NOx component and is discharged. The activated carbon which removes the SOx component and the NOx component is regenerated and recycled while passing through the regeneration tower.

The technical structure described above is a background technique for assisting the understanding of the present invention, and does not mean the prior art widely known in the technical field to which the present invention belongs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sintering apparatus for exhaust gas treatment and a control method thereof, which can improve the adsorption efficiency of SOX and NOX components by suppressing the generation of by-products such as condensate and salt generated in the adsorption unit.

The present invention to achieve the above object, the filter unit for removing the dust contained in the exhaust gas discharged from the sintering machine; An adsorption unit for removing SOX and NOX contained in the exhaust gas passing through the filter unit; A regeneration tower heating the activated carbon discharged from the adsorption unit and performing a regeneration process; A supply unit storing activated carbon supplied from the adsorption unit and supplying activated carbon continuously to the regeneration tower; Discharge unit for adjusting the amount of activated carbon discharged from the regeneration tower; A storage tank for collecting the regeneration tower discharge gas discharged from the regeneration tower; A downcomer that neutralizes the regeneration tower discharge gas by spraying the washing water on the regeneration tower discharge gas supplied from the storage tank; A supply flow meter for measuring the flow rate of the exhaust gas supplied to the adsorption unit; An exhaust flow meter for measuring the flow rate of the exhaust gas and the by-product discharged from the adsorption unit; And controlling the outputs of the blower fan and the main fan for pumping the exhaust gas to the adsorption unit when a difference between the flow rate measured by the supply flow meter and the flow rate measured by the discharge flow meter is greater than or equal to a predetermined value. It characterized in that it comprises a control unit for adjusting the catalyst supply amount.

In addition, the adsorption unit, the first adsorption unit for removing the SOx in the gas discharged from the sintering machine; A main fan for pumping the gas passing through the first adsorption part to heat the gas above the acid dew point; And a second adsorption part for removing NOx contained in the gas pumped by the main fan.

In addition, the second adsorption unit is provided with a reaction unit for injecting a catalyst to the gas passing through the second adsorption unit; The reaction unit, the blocking panel for partitioning the second body; A bypass passage portion connecting the spaces partitioned by the blocking panel to each other; And it characterized in that it comprises an injection unit for injecting a catalyst to the exhaust gas passing through the bypass passage.

The supply flowmeter may further include a first supply flowmeter installed at the first intake port of the first adsorption unit; And a second supply flow meter installed at the second suction port of the second suction part; The discharge flowmeter may include a first discharge flowmeter installed at a first exhaust port of the first adsorption unit; And a second discharge flow meter installed in the second exhaust port of the second adsorption unit.

In addition, the present invention comprises the steps of (a) measuring the flow rate of the exhaust gas for the sintering machine supplied to the adsorption unit filled with activated carbon and the discharge gas and by-products discharged from the adsorption unit; (b) determining whether a difference between the supply flow rate and the discharge flow rate of the adsorption unit is greater than or equal to a set value; And (c) characterized in that it comprises the step of controlling the output of the blower fan and the main fan for pumping the exhaust gas to the adsorption unit.

In the step (c), the amount of catalyst injected into the adsorption unit is controlled.

The apparatus for treating sintered exhaust gas according to the present invention and a control method thereof have a temperature inside the adsorption unit such that a difference between the flow rate of the exhaust gas supplied to the adsorption unit and the flow rate of the exhaust gas and by-products discharged from the adsorption unit is maintained below a set value. And by adjusting the pressure and the amount of the catalyst supplied into the adsorption unit has the advantage of reducing the emissions of by-products such as salt or condensate generated in the adsorption unit and improve the adsorption efficiency of SOX and NOX components.

1 is a configuration diagram illustrating an apparatus for treating exhaust gas for a sintering machine according to an embodiment of the present invention.
2 is a cross-sectional view showing a first adsorption unit of the exhaust gas treatment apparatus for a sintering apparatus according to an embodiment of the present invention.
3 is a cross-sectional view showing a second adsorption portion of the exhaust gas treatment apparatus for a sintering apparatus according to an embodiment of the present invention.
4 is a cross-sectional view showing a regeneration tower of the exhaust gas treatment apparatus for a sintering apparatus according to an embodiment of the present invention.
5 is a block diagram showing an exhaust gas treatment apparatus for a sintering apparatus according to an embodiment of the present invention.
6 is a block diagram showing a flow rate measuring unit of the exhaust gas treatment apparatus for a sintering apparatus according to an embodiment of the present invention.
7 is a flowchart illustrating a method for treating exhaust gas for a sintering machine according to an embodiment of the present invention.
8 is a flow chart illustrating an adsorption method of the exhaust gas treatment method for a sintering machine according to an embodiment of the present invention.
9 is a flowchart illustrating a method of regenerating activated carbon in a method for treating exhaust gas for a sintering machine according to an embodiment of the present invention.
10 is a flowchart illustrating a method of controlling a flow rate measuring unit of an exhaust gas treating apparatus for a sintering machine according to an embodiment of the present invention.

Hereinafter, an embodiment of an exhaust gas treating apparatus for a sintering machine according to the present invention will be described with reference to the accompanying drawings.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are terms defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator.

Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a configuration diagram showing an exhaust gas treatment apparatus for a sintering apparatus according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing a first adsorption portion of the exhaust gas treatment apparatus for a sintering apparatus according to an embodiment of the present invention. 3 is a cross-sectional view illustrating a second adsorption unit of an exhaust gas treating apparatus for a sintering apparatus according to an embodiment of the present invention.

In addition, Figure 4 is a cross-sectional view showing a regeneration tower of the exhaust gas treatment apparatus for a sintering apparatus according to an embodiment of the present invention, Figure 5 is a block diagram showing the exhaust gas treatment apparatus for a sintering apparatus according to an embodiment of the present invention. 6 is a block diagram illustrating a flow meter of an exhaust gas treating apparatus for a sintering apparatus according to an embodiment of the present invention.

1 to 6, the exhaust gas treatment apparatus for a sintering apparatus according to an embodiment of the present invention is the filter unit 20 for removing the dust contained in the gas discharged from the sintering machine 10 and the activated carbon is filled And the regeneration tower 60 that heats the adsorption units 30, 40, and 50 for removing SOX and NOX from the gas passing through the filter unit 20, and the activated carbon discharged from the adsorption units 30 and 50 to perform a regeneration process. ) And a supply unit 100 storing activated carbon supplied from the adsorption units 30, 40, and 50 and continuously supplying activated carbon to the regeneration tower 60, and controlling the amount of activated carbon discharged from the regeneration tower 60. The discharge unit 110, the storage tank 90 for collecting the regeneration tower discharge gas discharged from the regeneration tower 60 and the regeneration tower discharge by spraying the washing water to the regeneration tower discharge gas supplied from the storage tank 90 Down Comer (80) to neutralize the gas.

The exhaust gas of the sintering machine 10 is discharged through the chimney 70 after the dust is removed while passing through the filter unit 20, SOX and NOX is removed while passing through the adsorption unit (30, 40, 50).

At this time, the adsorption unit (30, 50) is filled with activated carbon for capturing SOX and NOX, the activated carbon passing through the adsorption unit (30, 50) and adsorbed SOX and NOX is discharged is heated in the regeneration tower (60) After regeneration, it is supplied to the adsorption parts 30 and 50 again.

The gas discharged from the regeneration tower 60 passes through the storage tank 90 and the downcomer 80 to remove foreign substances.

The adsorption unit 30, 40, 50 pumps the gas through the first adsorption unit 30 to remove SOX and the gas that has passed through the first adsorption unit 30 in the gas that has passed through the filter unit 20. The main fan 40 heated above a dew point, and the 2nd adsorption part 50 which removes NOX contained in the gas conveyed by the main fan 40 are included.

The second adsorption part 50 is provided with a reaction part 58 for injecting a catalyst to the gas passing through the second adsorption part 50.

The exhaust gas discharged from the sintering machine 10 passes through the filter unit 20 to remove dust, and passes through the first adsorption unit 30 to remove SOx.

The first suction part 30 includes a first main body 32 including a first intake port 32a, a first exhaust port 32b, and a first guide part 32c through which the exhaust gas of the sinterer 10 passes. And a first injection portion 34 for adjusting the amount of activated carbon supplied to the first body 32 and a first discharge portion 36 for adjusting the amount of activated carbon discharged from the first body 32. do.

The first injection part 34 is installed on the upper surface of the first body 32, and the first discharge part 36 is installed on the bottom of the first body 32, so the activated carbon supplied into the first body 32 is supplied. The silver is supplied to the first body 32 while maintaining a constant input amount by the first input part 34, and a certain amount of activated carbon is discharged to the outside of the first body 32 by the first discharge part 36.

Thus, since the activated carbon passing through the first body 32 maintains a constant amount and passes through the first body 32, the empty space where the activated carbon is not filled in the first body 32 is reduced.

Since the first guide part 32c is a funnel-shaped member, the plurality of first guide parts 32c are continuously installed so that the activated carbon falling on the upper side of the first guide part 32c falls down evenly along the plurality of first guide parts 32c in the downward direction. do.

The exhaust gas rising upward from the lower side of the first body 32 is moved upward through the gap between the first guide portions 32c.

Therefore, since the amount of contact between the exhaust gas and the activated carbon discharged to the outside of the first body 32 through the first exhaust port 32b after being introduced into the first body 32 through the first intake 32a increases, the SOx increases. Can be effectively removed.

The second suction part 50 includes a second main body provided with a second suction port 52a, a second exhaust port 52b, and a second guide part 52c through which the exhaust gas supplied by the main fan 40 passes. (52), a second injection portion (54) for adjusting the amount of activated carbon supplied to the second body (52), and a second discharge portion (56) for adjusting the amount of activated carbon discharged from the second body (52). And a reaction unit 58 for injecting a catalyst to the exhaust gas passing through the second body 52.

The second injection portion 54 is installed on the upper surface of the second body 52, and the second discharge portion 56 is installed on the bottom surface of the second body 52, so the activated carbon supplied into the second body 52 is supplied. The silver is supplied to the second body 52 while maintaining a constant input amount by the second input part 54, and a certain amount of activated carbon is discharged to the outside of the second body 52 by the second discharge part 56.

In this way, since the activated carbon passing through the second body 52 maintains a constant amount and passes through the second body 52, the empty space where the activated carbon is not filled in the second body 52 is reduced.

The second guide portion 52c has the same shape and installation structure as the first guide portion 32c.

Therefore, since the contact amount between the exhaust gas and the activated carbon discharged to the outside of the second body 52 through the second exhaust port 52b after rising and flowing into the second body 52 through the second intake port 52a increases, NOX Can be effectively removed.

In addition, since the catalyst is injected into the exhaust gas passing through the second adsorption unit 50, NOX and the catalyst react to remove the salt, thereby effectively removing NOX from the second adsorption unit 50.

The reaction unit 58 includes a blocking panel 58a for dividing the second body 52, a bypass passage 58b for connecting the spaces partitioned by the blocking panel 58a, and a bypass passage 58b. The injection unit 58c for injecting a catalyst to the exhaust gas passing through the).

Exhaust gas passing through the bypass passage (58b) passes through a narrow passage compared to the second body 52, it is possible to effectively react the catalyst and the exhaust gas injected by the injection unit (58c).

In addition, the bypass passage (58b) is formed on one side of the second body 52, the 'c' shape so as to connect the upper and lower portions of the second body 52 partitioned by the blocking panel (58a). Is bent.

Therefore, the salt generated by the reaction of the exhaust gas and the catalyst is not in contact with the activated carbon, and can be easily removed from the bypass passage portion 58b.

Here, the catalyst is made of ammonia, the reaction scheme of the chemical reaction in which the off-gas for the sintering machine reacts with ammonia to precipitate as a salt is as described in <reaction scheme> to be described later.

The inlets 34 and 54 are formed of adsorption reservoirs 34a and 54a provided at the inlets of the first adsorption unit 30 and the second adsorption unit 50 and activated carbon supplied to the adsorption reservoirs 34a and 54a. Adsorption valves 34c and 54c for determining whether to supply and supply amount, and adsorption level sensors 34b and 54b for detecting the stack height of activated carbon contained in the adsorption reservoirs 34a and 54a.

Here, when the stack height of the activated carbon received from the adsorption level sensors 34b and 54b is less than or equal to the set value, the control unit 108 transmits an open signal to the adsorption valves 34c and 54c.

The discharge parts 36 and 56 are provided at the discharge ports of the first adsorption part 30 or the second adsorption part 50 to open / close valves 38 and 58 to determine whether the activated carbon is discharged, and the first adsorption part ( 30) and rotary valves 36a and 56a installed at the discharge ports of the second adsorption unit 50 to maintain the discharge of activated carbon constantly.

Activated carbon is discharged through the discharge holes of the first adsorption part 30 and the second adsorption part 50 when the open / close valves 38 and 58 are opened, and activated carbon discharged along the discharge port when the open / close valves 38 and 58 are closed. Emissions are blocked.

Activated carbon is discharged by the operation of the on / off valves 38 and 58, and the discharge of activated carbon discharged through the discharge port by the rotary valves 36a and 56a is kept constant.

When the discharge of activated carbon is stopped, the on / off valves 38 and 58 are driven to stop the discharge of activated carbon discharged through the discharge port.

The opening / closing valves 38 and 58 are connected to the accommodating parts 38a and 58a, which are movably installed at intervals from the discharge port, and are connected to the accommodating parts 38a and 58a and vary the positions of the accommodating parts 38a and 58a. Storage cylinders 38b and 58b.

When the rod protrudes from the storage cylinders 38a and 58a, the accommodating portions 38a and 58a, which are formed in a concave bowl shape, are disposed to face the discharge holes, so that the activated carbon discharged along the discharge holes is blocked by the storage parts 38a and 58a. The discharge of activated carbon is stopped.

In addition, the discharge parts 36 and 56 of the present embodiment are installed at the discharge ports of the first adsorption part 30 and the second adsorption part 50, and when a malfunction is detected, the first adsorption part ( 30) and between the knife valves 37 and 57 to close the discharge port of the second adsorption part 50, the on-off valves 38 and 58 and the rotary valves 36a and 56a, and discharge of activated carbon Sliding gates 39 and 59 further determine the.

Therefore, when the discharge parts 36 and 56 are malfunctioned and the activated carbon is discharged more than necessary, the operator can close the knife valves 37 and 57 or the sliding gates 39 and 59 to stop the discharge of the activated carbon.

If clogging occurs in the on / off valves 38 and 58, the knife valves 37 and 57 can be closed to repair the on / off valves 38 and 58, and clogging occurs in the rotary valves 36a and 56a. In this case, the sliding gates 39 and 59 are closed to repair the rotary valves 36a and 56a.

If the stack height of the activated carbon contained in the adsorption reservoirs 34a and 54a is less than or equal to the set value, the activated carbon is supplied to the adsorption reservoirs 34a and 54a since the adsorption valves 34c and 54c are opened in response to a signal from the control unit 108.

The adsorption reservoirs 34a and 54a are installed on the upper surfaces of the first main body 32 and the second main body 52 to store the activated carbon supplied into the first main body 32 and the second main body 52. When the stacking height of the activated carbon accommodated in the 34a and 54a is kept constant, the supply amount of the activated carbon supplied to the first body 32 and the second body 52 is kept constant.

In addition, when the stack height of the activated carbon stored in the adsorption storage (34a, 54a) is lowered to the minimum value, the opening and closing valves (38, 58) are operated in accordance with the signal transmitted from the control unit 108, the first body 32 and the second It is possible to reduce the amount of activated carbon discharged from the body 52.

Therefore, since a predetermined amount or more of activated carbon is filled in the first body 32 and the second body 52, the contact between the exhaust gas and the activated carbon passing through the first body 32 and the second body 52 is activated. It is possible to prevent the amount from being reduced.

As described above, since the activated carbon is filled in the first adsorption unit 30, the SOx contained in the exhaust gas is adsorbed, and the exhaust gas passing through the first adsorption unit 30 maintains a temperature below the acid dew point. It is easily adsorbed on activated carbon.

The exhaust gas passing through the first adsorption part 30 is pressurized by the main fan 40 to the second adsorption part 50, and the pressure of the exhaust gas is increased because the inside of the transfer pipe is pressurized by the main fan 40. The temperature rises above the dew point.

Ammonia is injected into the exhaust gas whose temperature is raised above the acid dew point and passes through the second adsorption unit 50 filled with activated carbon, so that NOx is adsorbed to the activated carbon.

Exhaust gas passing through the second adsorption unit 50 is discharged to the atmosphere through the chimney 70 in a state in which SOX and NOX are removed.

Activated carbon discharged from the first adsorption unit 30 and the second adsorption unit 50 is collected and stored in the supply unit 100, and activated carbon is continuously supplied to the regeneration tower 60 by the operation of the supply unit 100.

The activated carbon supplied to the regeneration tower 60 is exposed to the hot air that is injected into the regeneration tower 60, so that NOx adsorbed on the activated carbon is burned.

Supply unit 100 is the storage 102 is installed in the inlet of the regeneration tower 60, and whether the supply of activated carbon discharged from the first adsorption portion 30 and the second adsorption portion 50 is supplied to the storage 102 And a first valve 104 for determining the supply amount, and a level sensor 106 for sensing the stacked height of the activated carbon accommodated in the reservoir (102).

Here, when the stacked height of the activated carbon received from the level sensor 106 is less than or equal to the set value, the control unit 108 transmits an opening signal to the first valve 104.

Activated carbon discharged from the first adsorption unit 30 and the second adsorption unit 50 is supplied to the storage 102, and activated carbon temporarily stored in the storage 102 is introduced into the regeneration tower 60.

The stacked height of the activated carbon stacked in the reservoir 102 is detected by the level sensor 106. When the stacked height of the activated carbon is lower than the set value, the level sensor 106 transmits an electrical signal to the controller 108 and the controller ( An open signal from 108 is transmitted to the first valve 104 to supply activated carbon to the reservoir 102.

Therefore, since the storage 102 always stores an amount of activated carbon in excess of a set value, it is possible to continuously supply a uniform amount of activated carbon into the regeneration tower 60.

In addition, since the discharge unit 110 includes a second valve 112 installed at the discharge port of the regeneration tower 60, the control unit 108 is transmitted when the stack height of the activated carbon stored in the storage 102 drops to the minimum value. Since the opening degree of the second valve 112 is reduced according to the signal, it is possible to reduce the amount of activated carbon discharged from the regeneration tower 60.

As described above, a certain amount of activated carbon is maintained in the regeneration tower 60, and when the regeneration tower 60 passes through the regeneration tower 60, the temperature and pressure of the regeneration tower 60 are maintained uniformly, thereby improving regeneration efficiency of the activated carbon. The effect will be improved.

In addition, since the activated carbon passing through the heating unit 64 in which high temperature hot air is injected inside the regeneration tower 60 passes through the heating section for a predetermined time, NOx is effectively burned and the regeneration efficiency is improved more effectively.

In the regeneration tower 60, a regeneration tower exhaust gas in which the SOx component is concentrated is generated, and the regeneration tower exhaust gas is moved to the downcomer 80 after being filled in the storage tank 90 to be neutralized.

The downcomer 80 includes a reaction tank 82 in which a regeneration tower exhaust gas and washing water are mixed, a first injection pipe 84 connected to the reaction tank 82 and supplying the washing water to the reaction tank 82, and The second injection pipe 86 is connected to the reaction tank 82 to be positioned below the first injection pipe 84 and supplies the regeneration tower exhaust gas to the reaction tank 82.

The regeneration tower exhaust gas discharged from the regeneration tower 60 is supplied into the reaction tank 82 along the storage tank 90 and the second injection pipe 86, and the washing water reacts along the first injection pipe 84. It is supplied into the tank 82.

Since the first injection pipe 84 is disposed above the second injection pipe 86, the washing water is injected into the regeneration tower exhaust gas injected into the reaction tank 82.

In the reaction tank 82, since the salt is generated by the reaction of the regeneration tower exhaust gas and the washing water, the SOx is neutralized.

The downcomer 80 of the present embodiment has been described with respect to the separate downcomer 80 installed in the sintering plant, and the coke oven exhaust gas treatment in the Hwaseong plant without installing a separate downcomer 80 in the sintering plant The second injection pipe 86 may be connected to the downcomer 80 to process the regeneration tower exhaust gas.

When the second injection pipe 86 is connected to the downcomer 80 of the Hwaseong plant, the second injection pipe 86 is installed below the first injection pipe 84 and the injection pipe for supplying the acid gas.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

In addition, the sintering machine exhaust gas treatment apparatus according to the present embodiment, the supply flowmeters (30a, 50a) for measuring the flow rate of the exhaust gas supplied to the adsorption unit (30, 50) and discharged from the adsorption unit (30, 50) When the difference between the flow rate meter 30b, 50b which measures the flow rate of gas and by-products, and the flow rate measured by the supply flow meter 30a, 50a, and the flow rate measured by the discharge flow meter 30b, 50b is more than a predetermined value, And a control unit 108 that controls the output of the blower fan and the main fan 40 for pumping the exhaust gas to 30 and 50 to adjust the temperature, the pressure and the amount of catalyst supply in the adsorption units 30 and 50.

In the adsorption unit (30, 50), the SOx and NOX components are collected in the activated carbon by the chemical reaction as the exhaust gas for the sintering machine and the activated carbon, this chemical reaction is caused by the temperature and pressure inside the adsorption unit (30, 50) Efficiency is determined.

Therefore, the flow rate of the exhaust gas supplied to the adsorption parts 30 and 50 by the supply flowmeters 30a and 50a is measured, and the exhaust gas discharged from the adsorption parts 30 and 50 by the discharge flowmeters 30b and 50b. By measuring the amount of by-products it is determined the efficiency of the collection process proceeds in the adsorption section (30, 50).

If the difference between the measured flow rate meter (30a, 50a) and the discharge flow meter (30b, 50b) is greater than the set value, the blowing efficiency is judged that the collection efficiency is lowered and blows the exhaust gas to the adsorption unit (30, 50) Adjust the output to reduce the difference between supply and discharge flow.

The supply flowmeters 30a and 50a are connected to the first supply flowmeter 30a provided in the first suction port 32a of the first suction part 30 and the second suction hole 52a of the second suction part 50. And a second supply flow meter (50a) provided, and the discharge flow meters (30b, 50b) include a first discharge flow meter (30b) provided in the first exhaust port (32b) of the first suction part (30), and a second And a second discharge flow meter (50b) provided in the second exhaust port (52b) of the adsorption section (50).

The flow rate of the exhaust gas supplied to the first adsorption part 30 is measured by the first supply flow meter 30a, and the exhaust gas and the by-product discharged from the first adsorption part 30 are transferred to the first discharge flow meter 30b. Is measured by.

Blowing fan (not shown) and main fan 40 for supplying the exhaust gas to the first adsorption unit 30 when the flow rate measured by the first supply flow meter 30a and the first discharge flow meter 30b is greater than or equal to a set value. By controlling the output of the) is adjusted the temperature and pressure inside the first adsorption portion (30).

The flow rate of the exhaust gas supplied to the second adsorption unit 50 is measured by the second supply flow meter 50a, and the exhaust gas and the by-product discharged from the second adsorption unit 50 are transferred to the second discharge flow meter 50b. Is measured by.

If the flow rate measured by the second supply flow meter 50a and the second discharge flow meter 50b is greater than or equal to the set value, the output of the main fan 40 for supplying the exhaust gas to the second adsorption unit 50 is adjusted. The temperature and pressure inside the second adsorption unit 50 are adjusted, and the injection unit 58c is controlled to adjust the amount of ammonia supplied into the second adsorption unit 50.

<Reaction Scheme>

_{6NO 2 + 8NH 3 → 7N 2} + 12H 2 O

6NO ₂ + 4NH ₃ → 5N ₂ + 6H ₂ O

The above <Reaction Formula> shows a chemical reaction occurring inside the second adsorption unit 50. When ammonia is injected by the injection unit 58c, condensate is generated by reacting with nitrogen dioxide and nitrogen gas is discharged.

At this time, when ammonia is excessively supplied, salt may be generated to cause clogging in the second adsorption part 50.

Therefore, when the amount of nitrogen gas measured in the second discharge flow meter 50b decreases and excessive generation of condensate and salt occurs, the injection unit 58c is controlled to reduce the supply of ammonia, thereby reducing the generation of condensate and salt. .

Reference numeral 68 is a nitrogen supply unit 68 for supplying nitrogen into the regeneration tower (60).

A method of treating exhaust gas for a sintering machine according to an embodiment of the present invention will now be described.

7 is a flowchart illustrating a method for treating exhaust gas for a sintering machine according to an embodiment of the present invention, and FIG. 8 is a flowchart illustrating an adsorption method for a method for treating exhaust gas for a sintering machine according to an embodiment of the present invention. 9 is a flowchart showing an activated carbon regeneration method of the exhaust gas treatment method for a sintering machine according to an embodiment of the present invention, Figure 10 is a flow meter control method of the exhaust gas treatment apparatus for a sintering machine according to an embodiment of the present invention is shown Flowchart.

1 to 10, the exhaust gas treatment method for a sintering apparatus according to an embodiment of the present invention to remove the dust contained in the exhaust gas of the sintering apparatus 10 (S10) and using the activated carbon as a catalyst Removing SOX contained in the exhaust gas (S20), heating the exhaust gas above the acid dew point (S30), and removing NOX contained in the heated exhaust gas using activated carbon as a catalyst ( S40, the step of spraying a catalyst to the exhaust gas in which the step of removing NOX (S40) (S50), the step of heating and regenerating activated carbon in the regeneration tower 60 (S60), and the regeneration tower 60 Filling the regeneration tower discharge gas discharged from the storage tank 90 (S70), and neutralizing the regeneration tower discharge gas by spraying the washing water to the regeneration tower discharge gas supplied from the storage tank 90 (S80). ).

The exhaust gas discharged from the sintering machine 10 removes dust while passing through the filter part 20, removes SOx while passing through the first adsorption part 30, and passes over the main dew point while passing through the main fan 40. After being heated to the NOx is removed while passing through the second adsorption portion 50 is discharged to the atmosphere through the chimney (70).

The exhaust gas passing through the first adsorption unit 30 and the second adsorption unit 50 is adsorbed by SOX and NOX by activated carbon, and the exhaust gas passing through the first adsorption unit 30 maintains a temperature below the acid dew point. As it is in a liquid state, it is easily adsorbed by activated carbon.

Since the exhaust gas passing through the second adsorption unit 50 is heated and passed above the acid dew point, it is easily adsorbed to the activated carbon by the characteristics of NOx.

In the step S30 of heating the exhaust gas by the main fan 40, the exhaust gas is pumped to the main fan 40 so that the pressure inside the transport pipe is increased so that the temperature of the exhaust gas is raised above the acid dew point.

Removing the SOx (S20) and removing the NOX (S40) is a step of determining whether the stacked height of activated carbon of the adsorption storage (34a, 54a) installed in the inlet of the adsorption unit (30, 50) is less than the set value (S22) If the stack height of the activated carbon is less than or equal to the set value, the adsorption valves 34c and 54c which determine whether to supply the activated carbon to the adsorption reservoirs 34a and 54a are opened to supply the activated carbon to the adsorption reservoirs 34a and 54a. Step S24 is included.

Since the adsorption reservoirs 34a and 54a maintain a state in which activated carbons having a predetermined height or more are stacked, the amount of activated carbon supplied into the first body 32 and the second body 52 from the adsorption reservoirs 34a and 54a is constant. Is maintained.

Therefore, the temperature and pressure inside the first body 32 and the second body 52 are kept constant, and the amount of contact between the exhaust gas and the activated carbon passing through the first body 32 and the second body 52 is reduced. This can be prevented, effectively capturing SOX and NOX.

In the step S22 of determining the stack height of the activated carbon when the stack height of the activated carbon exceeds a set value, the step S26 of closing the adsorption valves 34c and 54c is performed, and opening or closing the adsorption valves 34c and 54c. After the process proceeds to the step of determining the stacked height of the activated carbon (S22).

Therefore, by continuously detecting the stacking height of the activated carbon contained in the adsorption storage (34a, 54a) it is possible to adjust the supply amount of the activated carbon supplied to the first body 32 and the second body (52).

Subsequently, the activated carbon discharged from the first body 32 and the second body 52 is filled in the regeneration tower 60 and heated with hot air to separate SOx and NOX adsorbed on the activated carbon from the activated carbon to regenerate the activated carbon. Step S60 proceeds.

In addition, the step of removing SOX (S20) and the step of removing NOX (S40), the discharge gas flow rate for the sintering machine supplied to the adsorption unit (30, 50) filled with activated carbon and the adsorption unit (30, 50) Measuring the flow rate of the discharge gas and by-products discharged (S110), and determining whether the difference between the supply flow rate and the discharge flow rate of the adsorption unit (30, 50) is more than the set value (S120), and the adsorption unit (30, 50) And controlling the output of the blower fan and the main fan 40 to pressurize the exhaust gas (S130).

When the exhaust gas supply flow rate and the discharge flow rate of the first adsorption portion 30 and the second adsorption portion 50 is greater than or equal to a set value, the exhaust gas is pumped to the first adsorption portion 30 and the second adsorption portion 50. By controlling the output of the blowing fan and the main fan 40 to control the temperature and pressure inside the first and second adsorption portion 30 and 50.

In step S130 of controlling the output of the main fan 40, the ammonia injected to the second adsorption unit 50 is controlled because the injection unit 58c is controlled to adjust the amount of the catalyst injected to the second adsorption unit 50. The amount of is adjusted to reduce the amount of condensate and salt generated in the second adsorption unit (50).

Regenerating the activated carbon (S60) is a step of determining whether the stacked height of the activated carbon of the storage 102 installed in the inlet of the regeneration tower 60 is less than or equal to the set value (S62), and if the stacked height of the activated carbon is less than or equal to the set value, the first adsorption Activated carbon discharged from the first adsorption part 30 and the second adsorption part 50 by opening the first valve 104 installed between the part 30 and the second adsorption part 50 and the reservoir 102. Supplying to the reservoir 102 (S64), and adjusting the opening amount of the second valve 112 installed at the outlet of the regeneration tower when the stacking height of the activated carbon is less than or equal to the set value (S66).

Activated carbon stacked in the reservoir 102 maintains the stacking height of the set value or more, so that the amount of activated carbon supplied into the regeneration tower 60 from the reservoir 102 can be kept constant.

In addition, when the stacking height of the activated carbon exceeds the set value, the step S68 of closing the first valve 104 proceeds, and after the closing of the first valve 104 proceeds, the stacking height of the activated carbon of the storage 102 is set. It is determined whether or not it is less than (S62).

Therefore, if the stack height of activated carbon of the reservoir 102 is less than or equal to the set value, the first valve 104 is opened to supply activated carbon to the reservoir 102, and if the stack height of activated carbon exceeds the set value, the first valve 104 is closed. The process is continuous.

As described above, if the activated carbon stacking height of the storage 102 is maintained to exceed the set value, the temperature of the interior of the recycling tower 60 may be maintained because the amount of activated carbon supplied from the storage 102 to the regeneration tower 60 may be kept constant. And the pressure becomes constant.

In addition, when the activated carbon stacking height of the storage 102 is less than or equal to the set value, the step (S66) of controlling the second valve 112 installed at the outlet of the regeneration tower 60 is performed.

When the activated carbon stack height of the reservoir 102 is lower than the set value, the opening degree of the second valve 112 is reduced or closed.

Therefore, since the amount of activated carbon discharged from the regeneration tower 60 is reduced or blocked, it is possible to suppress an increase in the empty space in which the activated carbon is not filled in the regeneration tower 60. And it becomes possible to prevent passing through the cooling part 66 in a short time.

As described above, since the time during which the activated carbon passes through the heating portion is maintained at the inside of the regeneration tower 60, the regeneration efficiency of the regeneration tower 60 is improved.

In addition, when the stacked height of activated carbon in the reservoir 102 exceeds the set value, the first valve 104 is closed and the opening amount of the second valve 112 is increased, so that the activated carbon passing through the regeneration tower 60 passes. The time is kept almost uniform.

The regeneration tower exhaust gas is discharged from the regeneration tower 60 in which the regeneration process of the activated carbon is performed, and the regeneration tower exhaust gas is filled in the storage tank 90 and then reacts with the reaction tank 82 along the second injection pipe 86 at a constant pressure. Is supplied.

Since the washing water is supplied to the first injection pipe 84 installed above the second injection pipe 86, the washing water is injected into the regeneration tower discharge gas injected into the reaction tank 82.

Regeneration tower emissions are neutralized because the salts are produced by the reaction of the wash water and the regeneration tower emissions.

When the second injection pipe 86 of the present embodiment is connected to the downcomer 80 installed in the Hwaseong plant, ordination circulating the downcomer 80 is supplied through the first injection pipe 84, and the downcomer ( 80 is supplied with coke oven exhaust gas.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. .

In addition, the exhaust gas treatment apparatus for the sintering machine has been described as an example, but this is merely illustrative, and the exhaust gas treatment apparatus and the treatment method of the present invention may be used in other products other than the sintering machine.

Accordingly, the true scope of the present invention should be determined by the following claims.

10: sintering machine 20: filter part
30: first adsorption portion 32: first body
32a: first inlet 32b: first exhaust
32c: first guide part 34: first input part
34a: first adsorption reservoir 34b: first adsorption level sensor
34c: first suction valve 36: first discharge part
36a: first rotary valve 40: main fan
50: second adsorption portion 52: second body
52a: second intake port 52b: second exhaust port
52c: second guide portion 54: second inlet
54a: second adsorption reservoir 54b: second adsorption level sensor
54c: second suction valve 56: second discharge part
56a: second rotary valve 58: reaction part
58a: blocking panel 58b: bypass passage
58c: injection part 60: regeneration tower
62: main body 64: heating unit
66: cooling unit 70: chimney
80: downcomer 82: reaction tank
84: first injection tube 86: second injection tube
90: storage tank 100: supply unit
102: storage 104: first valve
106: level sensor 108: control unit
110: outlet 112: second valve

Claims (6)

Filter unit for removing the dust contained in the exhaust gas discharged from the sintering machine;
An adsorption unit for removing SOX and NOX contained in the exhaust gas passing through the filter unit;
A regeneration tower heating the activated carbon discharged from the adsorption unit and performing a regeneration process;
A supply unit storing activated carbon supplied from the adsorption unit and supplying activated carbon continuously to the regeneration tower;
Discharge unit for adjusting the amount of activated carbon discharged from the regeneration tower;
A storage tank for collecting the regeneration tower discharge gas discharged from the regeneration tower;
A downcomer that neutralizes the regeneration tower discharge gas by spraying the washing water on the regeneration tower discharge gas supplied from the storage tank;
A supply flow meter for measuring the flow rate of the exhaust gas supplied to the adsorption unit;
An exhaust flow meter for measuring the flow rate of the exhaust gas and the by-product discharged from the adsorption unit; And
When the difference between the flow rate measured by the supply flow meter and the flow rate measured by the discharge flow meter is more than a set value, the output of the blower fan and the main fan for pumping the exhaust gas to the adsorption unit is controlled to control the temperature, pressure and Exhaust gas treatment apparatus for a sintering apparatus comprising a control unit for adjusting the catalyst supply amount.
The method of claim 1, wherein the adsorption unit,
A first adsorption unit removing SOx in the gas discharged from the sintering machine;
A main fan for pumping the gas passing through the first adsorption part to heat the gas above the acid dew point; And
And a second adsorption unit for removing NOx contained in the gas pumped by the main fan.
3. The method of claim 2,
The second adsorption unit is provided with a reaction unit for injecting a catalyst to the gas passing through the second adsorption unit;
The reaction unit,
A blocking panel partitioning the second body;
A bypass passage portion connecting the spaces partitioned by the blocking panel to each other; And
And an injection unit for injecting a catalyst into the exhaust gas passing through the bypass passage.
The method of claim 2, wherein the supply flow meter,
A first supply flow meter installed in the first suction port of the first suction unit; And
A second supply flow meter installed on the second suction port of the second suction unit;
The discharge flow meter,
A first discharge flow meter installed in the first exhaust port of the first suction part; And
And a second discharge flow meter installed in the second exhaust port of the second adsorption unit.
(A) measuring the flow rate of the exhaust gas for the sintering machine supplied to the adsorption unit filled with activated carbon and the flow rate of the exhaust gas and by-products discharged from the adsorption unit;
(b) determining whether a difference between the supply flow rate and the discharge flow rate of the adsorption unit is greater than or equal to a set value; And
(c) controlling the output of the blower fan and the main fan for pumping the exhaust gas to the adsorption unit.
The method of claim 5,
In the step (c), the control method of the exhaust gas treatment apparatus for a sintering machine, characterized in that for controlling the amount of catalyst injected into the adsorption unit.

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