KR20150035159A - processing device for nitrogen oxides - Google Patents

Abstract

The present invention relates to a processing device for removing nitrogen oxide (NOx) included in exhaust gas which is discharged from a chemical process or an incinerator. According to an embodiment of the present invention, a processing device for absorbed nitrogen oxide decomposes nitrogen oxide into nitrogen and water by a mutual reaction between nitrogen oxide included in exhaust gas and catalyst, and discharges the purified gas into the air, the device comprising: a body including an inlet to which the exhaust gas is introduced and an outlet from which the purified gas is discharged; a nozzle for spraying a reducing agent to the exhaust gas which is introduced through the inlet in a spray condition; a cyclone-type mixer for uniformly mixing the reducing agent sprayed by the nozzle with the nitrogen oxide included in the exhaust gas to promote the mutual reaction thereof; a heater for maintaining the predetermined temperature which is appropriate for the mutual reaction between the nitrogen oxide of the exhaust gas going through the cyclone-type mixer and the catalyst; and a selective catalyst reducing reactor for decomposing the nitrogen oxide into nitrogen and water by the mutual reaction between the nitrogen oxygen included in the exhaust gas going through the heater and the catalyst. Accordingly, the purified gas by the selective catalyst reducing reactor is discharged through the outlet into the air, and the water is drained through a drain cock which is formed on the bottom surface of the body.

Description

[0001] The present invention relates to a processing device for nitrogen oxides,

The present invention relates to an adsorption type nitrogen oxide treatment apparatus, and more particularly, to a adsorption type nitrogen oxide treatment apparatus capable of removing nitrogen oxides (NOx) contained in exhaust gas discharged from a chemical process, an incinerator or the like.

BACKGROUND ART In a substrate glass melting apparatus for manufacturing a liquid crystal display (LCD) in which demand is rapidly increasing, a large amount of particulate matter, sulfur oxide (SOx), hydrogen chloride , Nitrogen oxides, carbon monoxide, other volatile organic compounds (VOCs), arsenic, and the like.

In addition, a large amount of harmful compounds and particulate matter are discharged from various furnaces such as incineration facilities and combustion furnaces. The type, concentration and amount of contaminants in these exhaust gases are different. However,

① Acid gases such as SOx, HCl, NOx, HF, etc. which mainly cause acid rain,

(2) NOx gas, which causes smog phenomena,

③ Toxic substances such as dioxins (TCDD / F)

④ Heavy metals such as As, Hg and Cd.

The conventional purification method for the exhaust gases of various furnaces will be briefly described. First, as a method for treating the acid gas, (a) an alkaline agent such as calcium hydroxide or sodium bicarbonate powder is used as the exhaust gas, (B) a semi-dry type in which exhaust gas is removed by using slaked lime slurry, and (c) a wet type in which an exhaust gas is reacted with an alkaline chemical such as caustic soda.

At this time, a filter and dust collector and an alkali powder feeder are used in the case of a dry type, and a slaked lime slurry is fed into a semi-dry type reaction case using a semi-dry type reaction tank. In case of a wet type, Soda and other alkaline chemicals are added to the solution.

Next, as a method for treating nitrogen oxides (NOx), there are (i) a non-catalytic reduction apparatus for spraying urea water or the like in a furnace generally at 850-950 ° C, (ii) (Iii) a wet scrubber for removal from the scrubber through oxidation, reduction and pH adjustment, and the like.

Commercial technologies for effectively removing NOx include selective catalytic reduction (SCR) using a catalyst and a reducing agent, selective non-catalytic reduction (SNCR) using only a reducing agent without a catalyst, catalytic reduction and low-NOx burner, which controls the combustion state in the furnace. Among them, selective catalytic reduction technology (considering the occurrence of secondary pollution, removal efficiency and operating cost) SCR) is being evaluated as an effective technique

Examples of the method of removing heavy metals and dioxins include (a) a method of adsorbing and removing an adsorbent (activated carbon) to the exhaust gas, (b) a method of adsorbing and removing the adsorbent using a fixed bed bed, and c) a moving bed similar to the fixed bed, and a fluid bed.

U.S. Patent No. 5,827,489 discloses a process for the preparation of a catalyst composition comprising an inorganic oxide support on at least one selected from alumina, aluminate, titanium dioxide and / or zirconium dioxide, in an amount effective for catalytic activity such as at least one of vanadium oxide, molybdenum oxide and / A catalytic composition in which the surface of the carrier is chemically bonded with vanadium, molybdenum and / or tungsten, and the catalyst does not have a crystalline phase of V2O3, MoO3 and / or WO3 is precipitated in the presence of ammonia in the presence of nitrogen oxide Containing gas stream to contact with a gas stream containing nitrogen oxides, thereby selectively reducing the nitrogen oxides.

In the above-mentioned US patent, a support and a catalyst which are resistant to poisoning of sulfur oxides as a selective reduction catalyst are selected, and the specifications of the catalyst having the optimum performance by controlling the loading amount of the active metal, the specific surface area and the pore size of the catalyst, While the cost of manufacturing is relatively high since each single material (or precursor) used as a carrier and catalyst must be prepared by catalyst preparation and mixing methods.

The embodiment of the present invention effectively treats nitrogen oxides (NOx) generated during an incineration process of a gas scrubber apparatus for burning and purifying noxious gases generated in a semiconductor manufacturing process or the like, removes and extinguishes nitrogen oxides, To the adsorbing nitrogen oxide treatment apparatus.

An embodiment of the present invention relates to a desorption type nitrogen oxide processing apparatus which can reduce the operating cost by using a catalyst having a nitrogen oxide treating ability of 95% or more even at a low temperature (230 DEG C or less).

The embodiment of the present invention can shorten the reaction time, reduce the size of the duct and the reactor, lower the treatment temperature of the catalyst, and prevent the generation of ammonium sulfate by reaction of NH3 and SO3 in the combustion gas Lt; RTI ID = 0.0 > adsorption < / RTI >

In an embodiment of the present invention, a reducing material (NH3) is uniformly mixed with nitrogen oxide particles flowing in a horizontal direction through a nozzle at low pressure with mist-like particles to uniformly mix them, Oxide processing apparatus.

According to an embodiment of the present invention, there is provided an adsorption type nitrogen oxide treatment apparatus comprising:

A nitrogen oxide processing apparatus for decomposing nitrogen oxide into nitrogen and water by mutual reaction of nitrogen oxide contained in exhaust gas with a catalyst and discharging the purified gas to the atmosphere, comprising:

A body having an inlet through which the exhaust gas flows and an outlet through which the purified gas is discharged;

A nozzle for spraying the reducing material in a spray state to the exhaust gas flowing through the inlet;

A cyclone type mixer for uniformly mixing the reducing material injected by the nozzle and the nitrogen oxide contained in the exhaust gas so as to promote the mutual reaction;

A heater for maintaining a predetermined temperature suitable for mutual reaction of the nitrogen oxide of the exhaust gas passing through the cyclone type mixer and the catalyst; And

And a selective catalytic reduction reactor for decomposing the nitrogen oxide into nitrogen and water by mutual reaction of the nitrogen oxide contained in the exhaust gas passing through the heater and the catalyst,

Wherein the gas purified by the selective catalytic reduction reactor is discharged to the atmosphere through the discharge port and the water is discharged through a drain cock formed on the bottom surface of the body.

According to a preferred embodiment of the present invention, there is provided a punched-plate type nozzle disposed on an upstream side of the cyclone mixer for delaying the flow of exhaust gas to the selective catalytic reduction reactor.

The perforated plate type nozzle

A first perforated plate through which the exhaust gas passes,

And a second perforated plate disposed on the downstream side of the first perforated plate so as to face the first perforated plate and having a relatively smaller through hole than the through hole of the first perforated plate.

The cyclone type mixer

The blades of the cyclone type mixer adjacent to each other are arranged in a zigzag manner so as to delay the conveyance speed of the exhaust gas.

And the operating temperature of the heater is maintained at 150 to 200 캜.

And the selective catalytic reduction reactor is operated at 200 to 230 ° C.

The injection pressure of the reducing material injected through the nozzle is 3 to 4 kg / cm 2, and the diameter of the spray particles of the reducing material is 10 to 20 μm.

And the discharge port of the nozzle is formed as a slot to prevent clogging.

The selective catalytic reduction reactor is characterized by being of a cartridge type having a lattice structure.

And a temperature sensor provided upstream of the selective catalytic reduction reactor.

And the body is horizontally installed so that the exhaust gas flowing through the inlet port is transferred in the horizontal direction.

The adsorption-type nitrogen oxide treatment apparatus according to the embodiment of the present invention configured as described above has the following advantages.

Effective treatment of nitrogen oxides (NOx) generated during the incineration process of gas scrubber equipment, which purifies harmful gas by incineration, eliminates and extinguishes nitrogen oxides and discharges them to the atmosphere, minimizing air pollution and environmental pollution have.

In addition, since the catalyst having a nitrogen oxide treatment capacity of 95% or more is used at a low temperature (230 DEG C or less), the operation cost can be reduced and the maintenance cost of the apparatus can be reduced.

Also, since the reaction time can be shortened, the size of the duct and the reactor can be reduced, the catalyst treatment temperature can be lowered, and the production of ammonium sulfate by the reaction of NH3 and SO3 in the combustion gas can be prevented.

In addition, by uniformly mixing the gaseous particles flowing in the horizontal direction and the reducing agent (NH3) of the fine particles sprayed at low pressure in the spray state (10 mu m) through the nozzles, the nozzle clogging is prevented, The reliability and practicality can be ensured.

1 is a schematic view of an adsorption-type nitrogen oxide treatment apparatus according to an embodiment of the present invention,
FIG. 2 is a use state of the adsorption type nitrogen oxide processing apparatus according to an embodiment of the present invention,
3 is a view for explaining a selective catalytic reduction reactor (SCR) in an adsorption type nitrogen oxide processing apparatus according to an embodiment of the present invention,
4 is a schematic diagram of an apparatus for treating nitrogen oxides in an incineration system.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are intended to illustrate the present invention in a manner that allows a person skilled in the art to easily carry out the invention. It is not intended to limit the technical spirit and scope of the present invention.

The adsorption type nitrogen oxide treatment apparatus according to an embodiment of the present invention shown in FIGS. 1 to 3,

A nitrogen oxide processing apparatus for decomposing nitrogen oxide into nitrogen and water by mutual reaction of nitrogen oxide contained in exhaust gas with a catalyst and discharging the purified gas to the atmosphere, comprising:

A body 12 having an inlet 10 through which the exhaust gas flows and an outlet 11 through which the purified gas is discharged;

A nozzle 13 for spraying the reducing material NH3 in a spray state to the exhaust gas flowing through the inlet 10;

A cyclone type mixer 14 for uniformly mixing the reducing material injected by the nozzle 13 and the nitrogen oxides (NOx) contained in the exhaust gas to promote mutual reaction therebetween;

A heater (not shown) that maintains a predetermined temperature suitable for the mutual reaction of the nitrogen oxide of the exhaust gas passing through the cyclone mixer 14 and the catalyst (the catalyst layer 22 may be arranged in two stages so as to reduce the amount of the catalyst used) 15) (which may be arranged in two steps); And

And a selective catalytic reduction (SCR) 16 for decomposing nitrogen oxide into nitrogen and water by mutual reaction of the nitrogen oxide contained in the exhaust gas passing through the heater 15 and the catalyst,

The gas that has been purified by the selective catalytic reduction reactor 16 is discharged to the atmosphere through the discharge port 11. The water is supplied to the drain pan 17 connected to the collecting plate 17 formed on the bottom surface of the body 12, (drain cock 18).

And a piercing plate type nozzle 19 disposed on the upstream side of the cyclone mixer 14 for delaying the flow of exhaust gas to the selective catalytic reduction reactor 16.

The perforated plate type nozzle (19)

A first perforated plate 19a through which a through-hole through which the exhaust gas passes,

And a second perforated plate 19b disposed on the downstream side of the first perforated plate 19a and opposed to the first perforated plate 19a and having a relatively smaller through hole than the through hole of the first perforated plate 19a .

The cyclone type mixer 14 has

The blades 20 of the adjacent cyclone-type mixer 14 are provided at least one stepwise in the direction perpendicular to the flow direction of the exhaust gas (for example, three-stepped type) And can be arranged in a zigzag manner to delay.

The operating temperature of the heater 15 can be maintained at 150 to 200 캜.

The selective catalytic reduction reactor (16) may be operated at 200 to 230 ° C.

The injection pressure of the reducing material injected through the nozzle 13 is 3 to 4 kg / cm 2, and the diameter of the spray particles of the reducing material may be 10 to 20 탆.

The discharge port of the nozzle 13 is formed as a slot to prevent clogging.

The selective catalytic reduction reactor (16) is characterized by being of a cartridge type having a lattice structure.

And a temperature sensor 21 installed on the upstream side of the selective catalytic reduction reactor 16.

The body 12 may be installed horizontally so that the exhaust gas flowing through the inlet 10 is transferred in the horizontal direction.

In the drawings, the reference character A is a gas scrubber for burning and cleaning harmful gases generated in a semiconductor manufacturing process or the like.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, examples of use of the adsorption type nitrogen oxide treatment apparatus according to one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3, exhaust gas containing nitrogen oxides (NOx) generated during the incineration process of the gas scrubber A flows into the inlet 10 of the body 12. At this time, the feeding of the exhaust gas in the body 12 can be kept constant by the reducing material NH3 sprayed by the nozzle 13 in the spray state.

The exhaust gas transferred by the injection of the reducing material passes through the perforated plate type nozzle 19 and then passes through the cyclone type mixer 14. The exhaust gas passes through the first perforated plate 19a in which the through holes are drilled, and then passes through the second perforated plate 19a, which is opposed to the first perforated plate 19a and has through holes relatively smaller than the diameter of the through holes of the first perforated plate 19b. That is, the first pier plate 19a and the second pier plate 19b can delay the transport speed of the exhaust gas passing through them.

Meanwhile, since the nitrogen oxide and the reducing material which have passed through the perforated plate type nozzle 19 are uniformly mixed by the cyclone type mixer 14, the mutual reactivity of the nitrogen oxide and the reducing material can be improved.

The nitrogen oxide contained in the exhaust gas uniformly mixed by the cyclone type mixer 14 is decomposed into water (H 2 O) and nitrogen (N 2) by the catalytic reduction of the selective catalytic reduction reactor (16).

At this time, the nitrogen purified by the selective catalytic reduction reactor (16) is discharged to the atmosphere through the discharge port (11). Meanwhile, the water is collected by a collecting plate 17 formed on the bottom surface of the body 12, and then drained to a designated place through the drain cock 18.

10; Inlet
11; outlet
12; Body
13; The nozzle
14; Cyclone mixer
15; heater
16; Selective Catalytic Reduction Reactor (SCR)
17; House board
18; Drain cock
19; Borehole type nozzle
20; blade
21; temperature Senser

Claims (11)

A nitrogen oxide processing apparatus for decomposing nitrogen oxide into nitrogen and water by mutual reaction of nitrogen oxide contained in exhaust gas with a catalyst and discharging the purified gas to the atmosphere, comprising:
A body having an inlet through which the exhaust gas flows and an outlet through which the purified gas is discharged;
A nozzle for spraying the reducing material in a spray state to the exhaust gas flowing through the inlet;
A cyclone type mixer for uniformly mixing the reducing material injected by the nozzle and the nitrogen oxide contained in the exhaust gas so as to promote the mutual reaction;
A heater for maintaining a predetermined temperature suitable for mutual reaction of the nitrogen oxide of the exhaust gas passing through the cyclone type mixer and the catalyst; And
And a selective catalytic reduction reactor for decomposing the nitrogen oxide into nitrogen and water by mutual reaction of the nitrogen oxide contained in the exhaust gas passing through the heater and the catalyst,
Wherein the gas purified by the selective catalytic reduction reactor is discharged to the atmosphere through the discharge port and the water is discharged through a drain cock formed on the bottom surface of the body. The adsorption-type NOx treatment apparatus according to claim 1, further comprising a punch-type nozzle provided on an upstream side of the cyclone mixer for delaying the flow of exhaust gas to the selective catalytic reduction reactor. 3. The apparatus of claim 2, wherein the perforated plate-
A first perforated plate through which the exhaust gas passes,
And a second perforated plate opposed to the first perforated plate on the downstream side of the first perforated plate, the perforated hole having a relatively smaller diameter than the through hole of the first perforated plate. The mixer according to claim 1, wherein the cyclone type mixer
Wherein at least one of the blades of the cyclone type mixer is provided in at least one stage in a direction perpendicular to the flow direction of the exhaust gas and the adjacent blades of the cyclone type mixer are arranged in a zigzag manner to delay the conveyance speed of the exhaust gas. Processing device. The adsorption type nitrogen oxide processing apparatus according to claim 1, wherein the operating temperature of the heater is maintained at 150 to 200 캜. The adsorption-type nitrogen oxide treating apparatus according to claim 1, wherein the selective catalytic reduction reactor is operated at 200 to 230 ° C. The adsorption-type NOx treatment apparatus according to claim 1, wherein the injection pressure of the reducing material injected through the nozzle is 3 to 4 kg / cm 2, and the diameter of the spray particles of the reducing material is 10 to 20 μm. The adsorption type nitrogen oxide processing apparatus according to claim 1, wherein the discharge port of the nozzle is formed as a slot to prevent clogging. The adsorption-type NOx treatment apparatus according to claim 1, wherein the selective catalytic reduction reactor is of a cartridge type having a lattice structure. The adsorption-type NOx treatment apparatus according to claim 1, further comprising a temperature sensor provided upstream of the selective catalytic reduction reactor. 11. The adsorption type nitrogen oxide processing apparatus according to any one of claims 1 to 10, wherein the body is installed horizontally so that the exhaust gas flowing through the inlet port is horizontally conveyed.

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