KR101887562B1 - How to clean exhaust gas in an incinerator - Google Patents

Abstract

The present invention relates to a method to purify exhaust gas in an incinerator and, more specifically, to a method to purify exhaust gas in an incinerator, wherein the exhaust gas generated from the incinerator is cooled, is primarily purified by a semi-dry purification tower, and is purified again by a dry purification tower to increase purification efficiency, and the dry purification tower converts the supplied exhaust gas into a vortex and a purification agent is inputted into the vortex to allow the purification agent to be in contact with the exhaust gas and purify the exhaust gas without being agglomerated and increase a retention time of the exhaust gas by the vortex so as to maximize purification efficiency. To this end, according to one embodiment of the present invention, the method to purify exhaust gas of an incinerator comprises: an incineration process of incinerating waste; a cooling process of cooling the exhaust gas generated from the incineration process; a semi-dry purification process of primarily purifying the exhaust gas cooled in the cooling process; a dry purification process of purifying again the exhaust gas primarily purified in the semi-dry purification process by using a separate dry purification tower; a filtering and dust collection process of removing the purification agent at least two from the exhaust gas purified in the dry purification process; and a discharge process of discharging the exhaust gas completing the filtering and dust collection process.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for purifying an exhaust gas from an incinerator,

The present invention relates to an exhaust gas purifying apparatus for purifying exhaust gas generated in an incinerator, and more particularly, to an exhaust gas purifier for cooling an exhaust gas generated from an incinerator, purifying the exhaust gas firstly by a semi-automatic purifier, It is possible to purify the exhaust gas by bringing the purifying agent into contact with the exhaust gas without aggregating the purifying agent as the purifying agent is added together with the purifying agent. To a method for purifying exhaust gas of an incinerator which can maximize the purification efficiency by increasing the residence time.

Generally, when incinerating wastes such as trash, exhaust gases from incineration facilities contain harmful substances such as acid gas, SOx, HCl, NOx, HF, In order to prevent air pollution, facilities for discharging exhaust gas after removing harmful components contained in the exhaust gas are required.

As a commonly used purification method, acidic gas is removed by adding calcium hydroxide powder to absorb the acidic gas.

However, when the slaked lime powder is injected into the exhaust gas, the injectability is not easy. Due to the characteristics of the powder, the pile lumps are clogged or adhered to the inside of the equipment due to the white liquor, so that the purification efficiency is lowered and the residue is excessively generated .

Further, the powder that has been gathered in the discharge process flows into the dust collecting apparatus together, resulting in a problem that the durability of the dust collecting apparatus is reduced due to an excessive load, and the service life is shortened.

In connection with the prior art 1 (the operation method of the incineration exhaust gas purifying system of Patent No. 10-0965912), chemicals (slaked lime, sulfuric acid, etc.) are injected into the cooling tower 130 to react with the exhaust gas to purify contaminants of the exhaust gas And a reaction tower for performing the reaction.

However, in the prior art document 1, since the flue gas is pumped into the cooling tower and the flue gas is injected into the cooling tower and reacted with the exhaust gas, the flow of the air stream is not smooth and the purification efficiency is relatively lowered.

In addition, during the lime lime injection process, there is a problem that the lime is clumped or fixed by white smoke to lower the purification efficiency.

Prior Art 1 (Method of operating exhaust gas purifying system of incinerator)

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems described above, and it is an object of the present invention to provide a method for purifying exhaust gas by cooling an exhaust gas generated from an incinerator and purifying the cooled exhaust gas through a semi-automatic purification process, The dry purifying process is performed in the form of a purifying column, and the exhaust gas is retained in the form of a vortex, and the purifying agent is directly introduced to the point where the vortex is generated, so that the flow rate of the vortex So that the cleaning agent does not aggregate and the cleaning agent and the exhaust gas are brought into an even contact with each other, thereby maximizing the efficiency of purifying the exhaust gas. In addition, since the cleaning agent does not aggregate, the load on the filtering and dust- Exhaust gas from an incinerator that can extend the life of equipment And an object thereof is to provide a screen method.

According to an aspect of the present invention, there is provided a method for purifying exhaust gas of an incinerator, comprising: an incineration process (S100) for incinerating waste; a cooling process for cooling the exhaust gas generated in the incineration process (S100) (S300) for primarily purifying the exhaust gas cooled in the cooling process (S200); an exhaust gas purifying process (S300) for purifying the exhaust gas, which has been primarily purified in the semi-automatic purge process (S300) (S400) for purifying the exhaust gas while delaying the residence time in which the purifying agent and the exhaust gas are in contact with each other by mixing the exhaust gas with the purifying agent while keeping the exhaust gas in the form of a vortex using a separate dry purifying column (40) A filtering and collecting step (S500) of removing foreign substances such as a cleaning agent from the exhaust gas purified in the dry purification step (S400); And an exhausting step (S600) for exhausting exhaust gas that has been filtered and collected in the filtering dust collecting step (S500).

Here, the dry purifying step (S400) includes an exhaust gas inflow step (S410) for introducing the exhaust gas purified in the semi-automatic purifying step (S300), a vortex generating step for generating a vortex by inclining the inflow exhaust gas (S430) for injecting a purifying agent into the exhaust gas formed in the vortex, a purge injecting step (S430) for injecting the purifying agent into the vortex formed in the vortex, and a flow rate increasing step for increasing the flow rate of the vortex by passing the vortex through the venturi (S450) for inducing the vortex in the direction of rotation to increase the vortex in the flow rate increasing step S440 and an exhausting step S470 for discharging the purified exhaust gas in contact with the cleaning agent through the vortex, And a control unit.

At this time, the vortex generating step S420 is connected to the semi-automatic purging tower 30 used in the semi-automatic purging operation S300, and the exhaust gas purified in the semi-automatic purging tower 30 is introduced into the dry purging tower 40 A vortex flow is generated inside the dry purifying column 40 by the blower 110 and the gas injection nozzle 121 which is inclined upward and inclined in one direction and injects the exhaust gas flowing from the blower 110 in the form of a vortex And a venturi tube 130 provided at a position directly above the vortex generator 120 to increase the flow velocity of the vortex generated in the vortex generator 120. The venturi tube 130 includes a venturi tube 130, And vortex is generated by using a vortex induction blade 140 which is provided in a plurality of curved surfaces to guide the exhaust gas injected from the gas injection nozzle 121 into a vortex shape.

Meanwhile, between the vortex induction step (S450) and the evacuation step (S470), an exhaust delay stage (step S450) for increasing the time of staying in the dry purifier column 40 in circulation in the form of a vortex mixed with the exhaust gas and the purifying agent S460).

The delay step S460 includes a delay partition wall 210 partitioning the inside of the dry purifier column 40 so that the exhaust gas flows into the upper and the lower part of the dry purifier column 40 in different directions, The exhaust gas is delayed by using the gas guide piece 220 which is provided in a spiral shape along the inside and the outside of the partition wall 210 so as to delay the time for the exhaust gas to stay inside the dry purifier column 40.

The exhaust gas purifying method of an incinerator according to an embodiment of the present invention has the following effects.

First, the purification efficiency can be improved by purifying the exhaust gas generated in the incinerator by performing both the semi-automatic purification process and the dry purification process.

Second, the cleaning efficiency can be increased by increasing the residence time using the vortex generation in the dry cleaning process.

Third, the purifying agent can be brought into contact with the exhaust gas evenly by the vortex so that the purification efficiency of the exhaust gas can be increased. In addition, the load applied to the filtering and dust collecting apparatus in the post-process filtering and dust collecting process is minimized to extend the life of the filtering and collecting apparatus There is an effect that can be done.

1 is a flow chart showing a method for purifying an exhaust gas of an incinerator according to an embodiment of the present invention.
FIG. 2 is a conceptual view conceptually showing a facility used in the process of the exhaust gas purifying method of an incinerator according to an embodiment of the present invention. FIG.
FIG. 3 is a flow chart showing details of a detailed process of the dry purification process in the exhaust gas purifying method of an incinerator according to an embodiment of the present invention.
4 is a perspective view illustrating the airflow control unit used in the vortex generating step in the exhaust gas purifying method of the incinerator according to the embodiment of the present invention.
5 is a process diagram showing that an exhaust delay step is further included in the exhaust gas purifying method of an incinerator according to an embodiment of the present invention.
6 is a cross-sectional view showing in detail the structure of the exhaust delay part used in the exhaust delay step in the exhaust gas purifying method of the incinerator according to the embodiment of the present invention
7 is a flow chart showing that a cleaning step is further included in the dry purifying step in the exhaust gas purifying method of an incinerator according to an embodiment of the present invention
8 is a cross-sectional view showing in detail a state in which a cleaning unit used in a cleaning step is further included in the dry cleaning process in the exhaust gas purifying method of an incinerator according to an embodiment of the present invention
FIG. 9 is a cross-sectional view showing a state in which a foreign matter inflow preventing cap is further provided in the cleaning nozzle in an exhaust gas purifying apparatus that can be applied to an incinerator according to an embodiment of the present invention to efficiently purify exhaust gas
10 is an operational state diagram showing details of a foreign matter inflow preventing cap provided on a cleaning nozzle in an exhaust gas purifier capable of efficiently purifying exhaust gas by applying it to an incinerator according to an embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for purifying exhaust gas generated in an incinerator for incinerating waste, and more particularly, to a method for purifying an exhaust gas generated in a dry purification tower The purifying agent introduced into the vortex is circulated in a strong vortex while the flow rate of the purifying agent is increased along with the exhaust gas, so that the residence time in the dry purification column can be increased. In addition, To an exhaust gas purifying method of an incinerator which can maximize the purifying efficiency.

Hereinafter, a method for purifying an exhaust gas of an incinerator according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a process diagram showing a method for purifying exhaust gas of an incinerator according to an embodiment of the present invention. FIG. 2 is a conceptual view conceptually showing a facility used in a process of exhaust gas purification method of an incinerator according to an embodiment of the present invention. to be.

1 and 2, the present invention relates to an exhaust gas purification method for an internal combustion engine, which comprises an incineration process (S100) for incineration of waste in an incinerator (10), a cooling process for cooling the exhaust gas generated in the incineration process (S100) (300) for purifying the cooled exhaust gas by using the semi-automatic purifier (30), purifying the exhaust gas primarily purified in the semi-purifier purifier (30) by using the dry purifier (40) A filtering and dust collecting process 50 for removing the purifying agent remnants and foreign substances used in the dry purifying process S400 from the exhaust gas purified in the dry purifying process S400 And an exhausting step (S600) for exhausting the exhaust gas filtered and collected by the foreign substances in the filtering and dust collecting step (S500).

Accordingly, it is possible to purify the exhaust gas discharged from the incinerator with high efficiency while minimizing the load applied to the dust collecting apparatus used in the dust collecting step (S500), thereby extending the service life of the dust collecting apparatus.

FIG. 3 is a detailed process diagram showing a detailed process of the dry purifying process in the exhaust gas purifying method of an incinerator according to an embodiment of the present invention.

Referring to FIG. 3, the dry purifying step (S400) includes an exhaust gas inflow step (S410) for introducing the exhaust gas, which is primarily purified in the semi-automatic purifier (30), into the dry purifier column (40) (S420) for converting the gas into a vortex form by the air flow control unit 100, which will be described later, and a cleaning agent input step (S420) for simultaneously inputting the cleaning agent in the vortex generation step (S420) (S440) for increasing the flow rate of the vortex in the state where the vortex-type exhaust gas and the purifying agent are mixed, and a step for increasing the flow rate of the exhaust gas in the vortex form in the flow rate increasing step (S440) (S470) for evacuating the purified exhaust gas by extending the retention speed inside the dry purification tower (40) by the vortex induction step (S450) for inducing the vortex flow (S450) and the vortex induction step (S450).

 Accordingly, in the dry purifying step S400, the exhaust gas is guided into the vortex flow type so as to stay inside the dry purifying column 40, and the purifying efficiency can be increased. When the exhaust gas is circulated in the vortex, (S500) to reduce the load at the time of filtration and dust collection, so that the life of the filtration and dust collecting facility (50) can be shortened Can be extended.

4 is a perspective view illustrating the airflow control unit used in the vortex generating step in the exhaust gas purifying method of an incinerator according to an embodiment of the present invention.

4, the airflow control unit 100 used in the vortex generating step S420 includes a blower 110 for injecting exhaust gas into the dry purifier tower 40 and a blower 110 for blowing exhaust gas injected from the blower 110 A vortex generating unit 120 generating a vortex in the dry purifying column 40 by obliquely spraying the vortex generating unit 120 and a vortex generating unit 120 having a diameter smaller than that of the vortex generating unit 120, And a venturi tube 130 for increasing the temperature of the venturi tube.

At this time, the vortex generators 120 are provided at a predetermined interval along the periphery of the air flow control unit 100 of the dry purifier column 40, and generate a vortex while being inclined upward, And a gas injection nozzle 121 which is inclined uniformly in either direction inside the air blower 110 and generates air vapors emitted from the blower 110.

The venturi tube 130 further includes a vortex induction blade 140 capable of guiding the exhaust gas obliquely injected from the gas injection nozzle 121 into a vortex shape.

On the other hand, a plurality of purge injecting nozzles 150 through which the purifying agent is injected are provided just above the gas injecting nozzle 121.

The purge injecting nozzle 150 is immediately mixed with the exhaust gas by injecting the purifying agent immediately at the point where the exhaust gas is converted into the eddy current.

Accordingly, the exhaust gas flowing into the exhaust pipe connected to the other pipe by the blower together with the exhaust gas is circulated in the form of a vortex, and the flow rate is further increased through the venturi pipe 130, In addition, the purifying agent introduced into the vortex type can be mixed with the exhaust gas evenly in the form of the exhaust gas so that efficient purification can be achieved.

5 is a process diagram showing that an exhaust delay step is further included in the exhaust gas purifying method of an incinerator according to an embodiment of the present invention.

5, there is further included an exhaust delay step S460 between the vortex induction step S450 and the exhaust step S470 to delay the internal residence time of the exhaust gas purifying column 40. [

The exhaust delaying step S460 is a step of delaying the exhaust gas flowing into the dry purifier column 40 when the exhaust gas is retained in the dry purifier column 40 and purified, It is possible to increase the residence time of the exhaust gas in the dry purifier column 40 by using the exhaust gas purifier 200.

As a result, it is possible to maximize the purification efficiency by prolonging the reaction time by contacting with the cleaning agent.

FIG. 6 is a cross-sectional view illustrating a detailed structure of an exhaust delay unit used in the exhaust delay step in the exhaust gas purifying method of an incinerator according to an embodiment of the present invention.

Referring to FIG. 6, the exhaust delay unit 200 can increase the residence time of the exhaust gas to be purified in the dry purifier column 40, A plurality of delay barrier ribs 210 opened in different directions are provided to increase the residence time by the delay barrier ribs 210, thereby enhancing the purification efficiency.

3, when the delay partition wall 210 is installed in two stages so that exhaust gas is guided in different directions from each other, the inside of the dry purifier column 40 is reciprocated about three times, The same effect as staying in the purifying column 40 can be exhibited.

The delay barrier 210 may further include a gas guide piece 220 for guiding the exhaust gas along a path through which the exhaust gas is circulated by the vortex.

The gas guide piece 220 induces the exhaust gas to be circulated more slowly while delaying the passage through which the exhaust gas is circulated by the vortex.

Accordingly, it is possible to maximize the purifying efficiency while further increasing the residence time of the exhaust gas in the dry purifier tower 40.

FIG. 7 is a process diagram showing that a cleaning step is further included in the dry purifying step in the exhaust gas purifying method of an incinerator according to an embodiment of the present invention.

Referring to FIG. 7, the method may further include a cleaning step (S480) of cleaning the interior of the dry purifying column 40 after purifying and discharging the exhaust gas.

In the washing step S480, the washing liquid is supplied into the dry purifying column 40 by the washing unit 300 installed in the dry purifying column 40 to perform washing.

Accordingly, if it is determined that the inside of the dry purifying column 40 has been contaminated after being used for a predetermined period of time, the performance of the dry purifying column 40 can be maintained and the service life of the dry purifying column 40 can be extended.

8 is a cross-sectional view illustrating in detail a state in which a cleaning unit used in the cleaning step is further included in the dry purifying process in the exhaust gas purifying method of an incinerator according to an embodiment of the present invention.

8, the washing unit 300 further includes a plurality of washing nozzles 310 through which the washing liquid is injected into the upper part of the dry purifying column 40. In the lower part of the dry purifying column 40, And an outlet 320 for discharging the generated foreign matter.

The cleaning nozzle 310 is closed by the valve while the cleaning is in progress, and is opened when the cleaning is required, and the cleaning liquid is injected from the outside to clean the inside of the dry purification tower 40.

The discharge port 320 discharges debris, foreign matter, and the like, which have been cleaned by the cleaning liquid flowing through the cleaning nozzle 310. The discharge port 320 is provided at a lower portion of the dry purifying column 40, Closing member when the cleaning liquid is injected through the cleaning nozzle 310 while the exhaust gas inlet of the dry purifying column 40 is closed and is opened as the internal pressure increases to discharge the foreign substances generated in the cleaning process 321).

The elastic opening and closing member 321 is also provided at a lower portion of the delayed partition wall 210 into which the exhaust gas flows from the upper portion of the delayed partition wall 210 in a closed state, It is possible to discharge it.

Therefore, the inside of the dry purifier column 40 can be easily cleaned and managed, thereby increasing the lifetime of the dry purifier column 40.

FIG. 9 is a cross-sectional view illustrating a state in which a foreign matter inflow preventing cap is further provided in a cleaning nozzle in an exhaust gas purifying apparatus that can be applied to an incinerator according to an embodiment of the present invention to efficiently purify exhaust gas.

Referring to FIG. 9, the present invention further includes a foreign matter inflow preventing cap 311 that can prevent foreign matter from flowing into the cleaning nozzle 310 in the cleaning process.

The foreign matter inflow preventing cap 311 is rotated at the lower portion of the washing nozzle 310 to seal or open the washing nozzle 310. The washing nozzle 310 is closed during the cleaning process and the cleaning is completed When the interior of the dry purifying column 40 is washed, it is opened by the pressure of the washing liquid and is opened to inject the washing liquid into the dry purifying column 40.

Accordingly, it is possible to prevent the cleaning nozzle 310 from being clogged by foreign substances generated in the cleaning process.

10 is an operational state diagram illustrating a foreign matter inflow preventing cap provided on a cleaning nozzle in an exhaust gas purifying apparatus that can be efficiently applied to an incinerator according to an embodiment of the present invention.

10, the foreign matter inflow prevention cap 311 is rotatably coupled by the cleaning nozzle 310 and the rotation hinge 312, and a torsion spring 313 is installed on the rotation hinge to prevent the foreign matter inflow prevention cap 311 Is always pushed toward the cleaning nozzle 310 to seal the cleaning nozzle 310 to prevent foreign matter from entering the cleaning nozzle 310.

At this time, the foreign matter inflow preventing cap 311 is divided into two parts and is pivoted to the left and right to be opened, and a double step 311a is formed at the middle part overlapping each other so that the sealing force can be further increased in the closed state.

While the inside of the dry purifying column 40 is cleaned as described above, the cleaning nozzle 310 is closed to prevent the foreign matter from entering the inside of the cleaning nozzle 310 in advance.

When it is determined that the interior of the dry purifying column 40 is contaminated, the inside of the dry purifying column 40 is cleaned. At this time, when the cleaning liquid is sprayed from the cleaning nozzle 310, The foreign substance inflow preventing cap 311 supported by the spring 313 is opened and the washing liquid can be injected into the dry purifying column 40.

Accordingly, when the inside of the dry purifying column 40 is required to be cleaned, the cleaning nozzle 310 is automatically closed during the purifying operation by the operation of spraying the cleaning liquid without any special operation, The cleaning liquid can be sprayed and cleaned.

In the present invention as described above, the exhaust gas cooled by the cooling tower is purified twice in the semi-automatic purification tower 30 and the dry purification tower 40 in purifying the exhaust gas generated in the waste incineration process, thereby maximizing the purification efficiency In addition, an air flow control unit is provided inside the dry purification tower to increase the residence time by circulating the introduced exhaust gas into a vortex form, and the purifying agent is injected at the vortex generation point, It is possible to maximize the purification efficiency by bringing the exhaust gas and the purifying agent into uniform contact with each other while preventing the cleaning agent from being bundled together as soon as they are mixed with each other. In addition, the load applied to the filtration and dust- The life of the filtration and dust collecting facility can be extended.

10: incinerator 20: cooling tower
30: Semi-Dry Purification Tower 40: Dry Purification Tower
50: Filtration and dust collection facility 100: Air flow control unit
110: blower 120: vortex generator
121: air injection nozzle 130: venturi tube
140: vortex induction blade 150: purge inject nozzle
200: exhaust delay unit 210:
220: gas guide piece 300: cleaning part
310: Cleaning nozzle 311: Foreign matter inflow prevention cap
312: Rotating hinge 313: Torsion spring
320: outlet 321: elastic opening / closing member

Claims (5)

An incineration process (S100) for incinerating the waste;
A cooling step (S200) of cooling the exhaust gas generated in the incineration process (S100);
A semi-dry cleaning process (S300) for primarily purifying the exhaust gas cooled in the cooling process (S200);
In the semi-automatic purge process (S300), the exhaust gas is kept in a vortex form using a separate dry purifier (40) equipped with an air flow controller (100) and mixed with a purifier to remove the purifier and the exhaust A dry purifying step (S400) of purifying the exhaust gas while delaying the residence time in which the gas comes into contact;
A filtering and collecting step (S500) of removing foreign substances such as a cleaning agent from the exhaust gas purified in the dry purification step (S400); And
And an exhausting step (S600) of exhausting the filtered and collected exhaust gas in the filtering and dust collecting step (S500)
The dry purifying step S400 includes an exhaust gas inflow step S410 for introducing exhaust gas purified in the semi-automatic purifying step S300, a vortex generating step S420 for generating a vortex by inclining the inflowing exhaust gas, (S430) for injecting a purifying agent into the exhaust gas formed by the vortex; and a flow rate increasing step S440 for increasing the flow rate of the vortex by passing the vortex through the venturi pipe 130 immediately after the purifying agent inputting step S430 (S450) inducing the vortex in the rotational direction to increase the vortex in the flow rate increasing step S440 and an exhausting step S470 of discharging the purified exhaust gas in contact with the cleaning agent through the vortex and,
The vortex generating step S420 may include a blower connected to the semi-automatic purging tower 30 used in the semi-automatic purging operation S300 to introduce the exhaust gas purified in the semi-automatic purging tower 30 into the dry purging tower 40 A vortex is generated in the dry purifying column 40 by a gas injection nozzle 121 which is inclined upward and inclined in one direction and injects the exhaust gas introduced from the blower 110 in the form of a vortex A venturi tube 130 provided at a position directly above the vortex generator 120 to increase the flow velocity of the vortex generated in the vortex generator 120 and a venturi tube 130 disposed inside the venturi tube 130 in one direction, And a vortex induction blade 140 that induces the exhaust gas injected from the gas injection nozzle 121 into a vortex shape is used to generate a vortex,
In the vortex induction step S450 and the evacuation step S470, an exhaust delay step S460 for increasing the residence time in the dry purifier column 40 in the form of a vortex in a mixed state of the exhaust gas and the purifying agent, And exhausting the exhaust gas to the combustion chamber.
delete delete delete The method according to claim 1,
The exhaust delay step S460 includes a delay partition wall 210 partitioning the inside of the dry purifier column 40 so that the exhaust gas flows into the upper and the lower part of the dry purifier column 40 in different directions, 210), and the gas induction piece (220) is provided in a spiral shape along the inner side and the outer side of the incinerator to delay the time when the exhaust gas stays in the dry purifier column (40) Gas purification method.

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