CN118286854A

CN118286854A - Incinerator and exhaust gas treatment device for combustion furnace

Info

Publication number: CN118286854A
Application number: CN202211304985.8A
Authority: CN
Inventors: 金荣洙
Original assignee: Yongyou Green Technology
Current assignee: Yongyou Green Technology
Filing date: 2022-10-24
Publication date: 2024-07-05

Abstract

The present invention relates to an exhaust gas treatment device for an incinerator and a burner, and more particularly, to an exhaust gas treatment device for an incinerator and a burner, which can effectively remove fine particulate matter, nitrogen oxides (NOx), dioxin, and the like in exhaust gas generated when the incinerator and the burner are operated. An exhaust gas treatment device for an incinerator and a combustion furnace according to the present invention includes: a boiler (200) connected to the incinerator and the combustion equipment (100) of the combustion furnace; a dry reaction unit (300) which is connected to the boiler (200) and removes harmful acid gases; a filter dust collection unit (400) which is connected to the dry reaction unit (300) and filters dust of the exhaust gas, and removes nitrogen oxides and dioxin; and a denitration catalyst unit (500) for performing a denitration reaction on the exhaust gas passing through the filter dust collection unit (400) by a catalyst, wherein the exhaust gas treatment device for the incinerator and the combustion furnace further comprises: and a gasification unit (600) which is installed between the dry reaction unit (300) and the filtration dust collection unit (400) and gasifies the ammonia water into gaseous ammonia and water vapor to produce granular ammonium sulfite and ammonium sulfate.

Description

Incinerator and exhaust gas treatment device for combustion furnace

Technical Field

The present invention relates to an exhaust gas treatment device for an incinerator and a burner, and more particularly, to an exhaust gas treatment device for an incinerator and a burner, which can effectively remove fine particulate matter, nitrogen oxides (NOx), dioxin, and the like in exhaust gas generated when the incinerator and the burner are operated.

Background

In general, industries using energy such as power plants, steel plants, and the like use fuels such as coal, natural gas, and the like to operate combustion facilities such as boilers, incinerators, and combustion furnaces.

Since the exhaust gas generated in such a combustion facility contains atmospheric pollutants such as fine particulate matter, nitrogen oxides (NOx), and dioxin, all factories that generate the atmospheric pollutants are burdened with various processing facilities and costs for reducing the emission of fine particulate matter, nitrogen oxides, dioxin, and the like.

In the prior art, the exhaust gas is discharged to the atmosphere after removing air pollutants through the treatment facility, but in this process, in order to remove various atmospheric pollutants, the treatment facility is installed according to the kind of the atmospheric pollutants.

In one aspect, fine particulate matter is filtered and collected by a fibrous bag filter or ceramic filter and removed. In addition, nitrogen oxides are typical as gaseous substances, and catalytic decomposition methods and catalytic reduction methods are applied as the denitration method thereof. This is a method for removing nitrogen oxides by catalysis, and particularly, a Selective Catalytic Reduction (SCR) method is excellent in denitration formation, and thus is widely used for removal of nitrogen oxides. The Selective Catalytic Reduction (SCR) is a method in which UREA water (ura) or an aqueous ammonia amino reducing agent is mixed with exhaust gas and passed over an alumina-based, titania-based or zeolite-based catalyst while nitrogen oxides in the exhaust gas are denitrated. Since the fine particulate matter or nitrogen oxides have different material characteristics, separate dust collecting systems and denitration systems are installed and operated in connection with the pipe discharge system.

Examples of such techniques are disclosed in the following documents 1 to 2.

Patent document 1 discloses a heat accumulating type exhaust gas denitration device including: an air supply part formed to allow air to flow in; an exhaust gas supply unit for supplying exhaust gas; a heat storage unit configured to be heated by the exhaust gas flowing into the exhaust gas supply unit, so that the air flowing from the air supply unit can be heated; a urea water supply unit for supplying urea water; a gasification part including a gasification chamber so as to convert urea water into ammonia by the air heated from the heat storage part; an injection part connected to one end of the gasification chamber and injecting ammonia in a gaseous state; a reaction chamber in which the ammonia in a gaseous state injected from the injection part is mixed with the exhaust gas to form a mixed gas; and a reactor which is filled with a catalyst and generates a chemical reaction so that nitrogen oxides in the mixed gas flowing in from the reaction chamber are converted into nitrogen gas by a denitration reaction at the catalyst.

In particular, when the urea water is injected into the gasifier in the form of mist, the gasification part gasifies the urea water by the internal temperature of the gasifier and then thermally decomposes to generate ammonia gas. That is, urea water is converted into ammonia gas when the urea water is injected in a fine particle size in a gasifier and operated at a certain temperature.

However, as the injection amount increases, the particle size also increases, and therefore, in a large-capacity urea solution gasifier, 3 to 4 urea solution injection nozzles are selected depending on the injection amount. Therefore, if the injection amount of urea solution is increased by the injection nozzle, the particle size is increased, and if the particle size of the injected urea solution is too large or the temperature inside the gasifier is low, the urea solution particles cannot be converted into ammonia gas, and there is a problem that the urea solution particles adhere to the inside of the gasifier or the rear end or the equipment is clogged in a solid state.

Patent document 2 discloses an integrated composite denitration system including: a filter dust collector formed in a hollow box shape, and having an exhaust gas inflow port formed at one side for inflow of the burned exhaust gas exhausted from the boiler; the filter cloth is arranged in the filter dust collector and is made of cotton, wool, asbestos, spring spun natural fibers, glass fibers or synthetic fibers or artificial fibers; and a plate-shaped SCR catalyst layer that is provided inside the filter cloth and that removes nitrogen oxides included in the exhaust gas. The filter cloth is in a bag shape, the SCR catalytic layer is arranged on the filter cloth and used for removing nitrogen oxides contained in exhaust gas, one side of an exhaust gas inflow port of the filter dust collector is provided with an adjusting damper capable of adjusting the inflow amount of exhaust gas containing nitrogen oxides flowing into the filter dust collector, and the platy SCR catalytic layer comprises a bracket arranged inside the filter dust collector; and a disc-shaped SCR catalyst mounted on the support and disposed at a plurality of stages at a certain interval so as not to have a pressure difference. The cross section of the SCR catalyst is any one of honeycomb shape and corrugated shape.

However, the filter dust collector of the related art as described above deposits ammonium sulfite and ammonium sulfate as denitration catalyst salts in cells (cells) of the honeycomb-shaped SCR catalyst, resulting in blocking of the cells of the SCR catalyst and blocking of exhaust gas flow, thereby having problems of causing deterioration of catalyst performance and corrosion of catalytic equipment.

In addition, as ammonium sulfite deposits on the SCR catalyst, the concentration of nitrogen and sulfur components increases rapidly, because the specific surface area decreases due to the formation of ammonium sulfite deposits caused by unit clogging, and thus the conversion of nitrogen oxides also decreases, and active sites of the SCR catalyst are clogged, resulting in a problem that the activity of the denitration catalyst decreases.

In addition, there is a problem in that the flow path of the SCR catalyst is reduced, the flow rate is increased, and the residence time for denitration is reduced due to pressure loss.

[ Prior Art literature ]

[ Patent literature ]

(Patent document 0001) korean patent laid-open publication No. 10-0963910 (2010.06.17)

(Patent document 0002) korean patent laid-open publication No. 10-1041651 (2011.06.14)

Disclosure of Invention

(Problem to be solved)

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an exhaust gas treatment device for an incinerator and a combustion furnace, which can expand the contact area of a heater heated by an external power supply through a heat storage unit of a gasification unit, thereby not only improving the heat transfer efficiency to a heat medium flowing in a spiral pipe body, but also improving the heating rate, and thereby can rapidly heat a double-row pipe.

Further, an object of the present invention is to provide an exhaust gas treatment device for an incinerator and a combustion furnace, in which a tangential flow induction unit of a gasification unit promotes generation of a vortex of exhaust gas to rotate in a vortex shape, and the vortex rotates downward along an inner wall of a gasification chamber, thereby maintaining a retention time of heat and ammonia water in the exhaust gas for a predetermined period of time.

Further, it is an object of the present invention to provide an exhaust gas treatment device for an incinerator and a combustion furnace, which can be used semi-permanently by regenerating and maintaining the denitration catalyst unit module by a foreign matter removing portion, instead of replacing the denitration catalyst unit module.

Further, an object of the present invention is to provide an exhaust gas treatment device for an incinerator and a combustion furnace, which is capable of preventing contamination of surrounding air by foreign substances by separating and absorbing and collecting the foreign substances in the housing space of the housing when the denitration catalyst unit module is cleaned by the dust collecting unit.

(Means for solving the problems)

In order to achieve the above object, an exhaust gas treatment device for an incinerator and a combustion furnace according to the present invention includes: a boiler 200 connected to the incinerator and the combustion apparatus 100 of the combustion furnace; a dry reaction part 300 connected to the boiler 200 and removing harmful acid gases; a filtering dust collection part 400 connected to the dry reaction part 300 and filtering dust of the exhaust gas, and removing nitrogen oxides and dioxin; and a denitration catalyst unit 500 for performing a denitration reaction by a catalyst on the exhaust gas passing through the filter dust collection unit 400, wherein the exhaust gas treatment device for the incinerator and the burner further comprises: the vaporizing unit 600 is installed between the dry reaction unit 300 and the dust filtering and collecting unit 400, and vaporizes the ammonia water into gaseous ammonia and water vapor to produce granular ammonium sulfite and ammonium sulfate.

In addition, the gasification unit 600 includes: a gasification chamber 610 having an exhaust gas inflow portion 611 formed at one side and an exhaust portion 612 for exhausting the mixed exhaust gas formed at the other side; a double-row pipe 620 connected to an upper portion of the vaporizing chamber 610 and separately supplying ammonia water and compressed air therein; a spray nozzle 630 installed at an end of the double gauntlet 620 to spray preheated ammonia and compressed air; a one-touch clamp 640 coupled to an outer surface of the double gauntlet 620 such that the double gauntlet 620 is detachably coupled to the gasification chamber 610; a heat storage part 650 for fixing the double gauntlet 620 at the center of the gasification chamber 610 and transferring heat to the double gauntlet 620 to preheat ammonia water and compressed air; and a tangential flow inducer 660 installed at an upper portion of the inner side of the gasification chamber 610, and mixing with ammonia water by centrifugal force of the swirling flow of the exhaust gas and moving toward a lower portion of the gasification chamber 610.

An ammonia water supply unit 670 is connected to one side of the vaporizing chamber 610, ammonia water stored in the ammonia water storage tank is quantitatively supplied to the ammonia water supply unit 670, a compressed air supply unit 680 is connected to the other side of the vaporizing chamber 610, and compressed air quantitatively regulated is supplied to the compressed air supply unit 680.

Further, ammonium sulfate and ammonium sulfite, which are fine particulate matters having a particle size of 0.01 to 0.3 μm, are generated in the exhaust portion 612 of the gasification chamber 610, and are discharged together with the exhaust gas.

In addition, the heat storage unit 650 includes: a cylindrical housing 651 vertically disposed inside the exhaust gas inflow portion 611 and configured to house a heat medium therein; a spiral pipe body 652 installed inside the casing 651 and penetrating the double drain pipe 620 to the inside thereof; a spiral guide 653, formed in a spiral shape on the outer surface of the spiral tube body 652, for guiding the heat medium to move in a spiral tube shape; and a heater 654 installed at an outer surface of the spiral tube body 652 in a spiral winding manner and heating a heat medium.

A supply port 651a for supplying the heat medium is formed on the upper side of the casing 651, and a discharge port 651b for discharging the heat medium to the outside is formed on the lower side.

In addition, the tangential flow induction part 660 includes: a suction duct 661 installed to communicate with the lower end of the exhaust gas inflow part 611 and protruded to form a spiral protrusion 661a on the inner circumferential surface; the guide vane 662 is installed on the upper inner circumferential surface of the suction duct 661, and rectifies the flow of the exhaust gas.

In addition, the spray nozzle 630 sprays ammonia water and compressed air at an angle of 15 to 20 degrees in the range of 2.0 to 3.0 bar.

In addition, the filtering dust collection part 400 includes: a dust collector 410 in which a plurality of bag filters 420 are arranged; the bag filter 420 has a fine porous polytetrafluoroethylene film 421 having a pore size in the range of 0.05 to 2.0 μm laminated on one side.

In addition, the denitration catalyst 500 includes: a denitration chamber 510 having a vane 511 for guiding the flow of exhaust gas flowing into the inside at an upper portion of the inside, and having an openable door 512 at an outer side thereof; the denitration catalyst unit module 520 is installed inside the denitration chamber 510 in an up-down isolated manner; a rectifier 530 installed at an upper inner portion of the denitration chamber 510, and guiding exhaust gas passing through the vane 511 to be uniformly distributed at an upper portion of the denitration catalyst unit module 520; a foreign matter removing part 540 installed at one side of the denitration chamber 510, and spraying air to the denitration catalyst unit module 520 transferred to the outside through the opened door 512 to remove foreign matters; and a dust collection part 550 installed below the foreign material removal part 540 for collecting the foreign material removed from the foreign material removal part 540.

The foreign matter removal unit 540 includes: a fixing frame 541 having a square frame shape; a housing 542 disposed inside the fixed frame 541 and having an opening 542a opened from one side to the other side so as to allow the denitration catalyst unit module 520 to be inserted therein; a lifting driving part 543 installed at an upper portion of the fixing frame 541 and lifting or lowering the housing 542; a plurality of air jetting nozzles 544 arranged on the wall surface of the inlet 542a of the housing 542; and an air supply section 545 connected to the air injection nozzles 544 by a pipe 546 and supplying air to the air injection nozzles 544.

The plurality of rollers 542b are arranged in order in the lateral direction at the lower portion of the inner side of the housing 542 so as to support the denitration catalyst unit module 520 put into the input port 542a and guide the transfer, and a receiving space 542c for receiving foreign matters separated when cleaning the denitration catalyst unit module 520 is formed.

In addition, the pipe 546 is connected to an air distributor 547 so as to be partially supplied with air.

In addition, the dust collection part 550 includes: a dust collection housing 551 having a receiving space formed therein and a tube insertion hole 551a formed at an upper side thereof; a suction fan 552 mounted on the upper part of the dust collection housing 551, for sucking the foreign matters contained in the housing 542 of the foreign matter removal unit 540 and discharging the foreign matters to the dust collection housing 551; a suction pipe 553, one end of which is connected to the accommodation space 542c of the housing 542, and the other end of which is connected to the suction port of the suction fan 552; and a discharge pipe 554 having one end connected to the discharge port of the suction fan 552 and the other end connected to the receiving space of the dust collection housing 551.

(Technical effects)

As described above, according to the incinerator and the exhaust gas treatment device for a combustion furnace of the present invention, the contact area of the heater heated by the external power supply is enlarged, and not only the heat transfer efficiency to the heat medium flowing in the spiral pipe body is improved, but also the heating speed is improved, so that the dual exhaust pipe can be quickly heated, and the temperature of the ammonia water and the compressed air can be quickly warmed up.

In addition, the vortex generation of the exhaust gas is promoted to rotate in a vortex shape and to rotate downward along the inner wall of the gasification chamber, and the retention time of the heat and the ammonia of the exhaust gas is maintained for a certain time, thereby having the effect of completely decomposing into gaseous ammonia and water vapor.

In addition, instead of replacing the denitration catalyst unit module, the denitration catalyst unit module is regenerated and maintained in continuous performance, so that the denitration catalyst unit module can be used semi-permanently, and therefore has an effect of reducing management cost.

In addition, the foreign matter in the accommodating space of the dust collecting falling shell is separated and absorbed when the denitration catalytic unit module is cleaned, thereby having the effect of preventing the pollution of the surrounding air caused by the foreign matter.

Drawings

Fig. 1 is a view showing the overall configuration of an exhaust gas treatment device of an incinerator and a burner according to the present invention.

Fig. 2 is a view showing a bag filter according to the present invention.

Fig. 3 is a cross-sectional configuration view showing a gasification part according to the present invention.

Fig. 4 is a cross-sectional configuration view showing an enlarged heat accumulating portion and tangential flow inducing portion according to the present invention.

Fig. 5 is a perspective view showing a denitration catalyst according to the present invention.

Fig. 6 is a configuration diagram showing a denitration catalyst according to the present invention.

Detailed Description

In the following, the most preferred embodiments of the present invention will be described in detail so as to be easily implemented by those skilled in the art.

As shown in fig. 1, the exhaust gas treatment apparatus for an incinerator and a burner according to the present invention includes a boiler 200 connected to a combustion device 100 of the incinerator and the burner, a dry reaction part 300 connected to the boiler 200 and removing harmful acid gases, a dust filtering and collecting part 400 connected to the dry reaction part 300 and filtering exhaust gas dust and removing nitrogen oxides and dioxins, and a denitration catalyst part 500 performing denitration reaction of exhaust gas passing through the dust filtering and collecting part 400 by a catalyst. At the same time, a blower 700 for forcibly discharging the exhaust gas discharged from the denitration catalyst 500 and a chimney 800 for discharging the exhaust gas to the atmosphere through the blower 700 are also included.

After the combustion of the waste or the like by the combustion apparatus 100, the pollutants generated by the boiler 200 according to the combustion of the waste are supplied to the dry reaction part 300 in a heated state. In particular, the exhaust gas supplied to the dry reaction part 300 is classified and mixed together with the reactant, and is supplied to the filter dust collection part 400 after being adsorbed and removed centering on the harmful acid gas and the gaseous heavy metal substances.

The filter dust collection unit 400 includes a dust collector 410 in which a plurality of bag filters 420 are arranged, and a bag filter in which a fine porous polytetrafluoroethylene film 421 having a pore size in the range of 0.05 to 2.0 μm is laminated on one side.

Although not shown in the drawings, the dust container 410 is formed with an inflow port for inflow of exhaust gas at one side and an exhaust port for exhaust gas, from which dust is removed by the bag filter 420, at the other side, to the outside.

A hopper shaped as a funnel is formed at the lower end of the dust collector 410 to collect dust such as dust filtered by the bag filter 420, and a discharge port to discharge the collected dust to the outside may be additionally formed at the lower end of the hopper.

The bag filters 420 are formed in plurality and may be combined in a detachable form to an exhaust gas flow path inside the dust container 410, thereby providing a function of filtering dust such as dust from the exhaust gas flowing into the inside of the dust container 410.

Such a bag filter 420 is made of any one of polyimide (polyimide), meta-aramid (meta-aramid), polyphenylene sulfide (poly phenylene sulfide), and fiberglass (fiberglass). In addition, the material can also be made of synthetic resin for high temperature, green environment-friendly material and the like.

The bag filter 420 passes between a roller and a compression rubber roller in a state that the surface is covered with a fine porous polytetrafluoroethylene film and is thermally compressed.

As shown in fig. 2, as a filtration membrane for collecting and removing particulate reaction substances generated by removing fly ash and acid gases contained in exhaust gas, ammonium sulfate and ammonium sulfite generated in the gasification unit 600, etc., a biaxially stretched polytetrafluoroethylene membrane having a pore size in the range of 0.05 to 2.0 μm can be used to form a particulate substance layer (dust cake) for effective removal.

The bag filter 420 is composed of a cylindrical bag filter (round type bagfilter) or a pleated bag filter (pleated bagfilter) formed by alternately extending in a pleat pattern in the longitudinal direction along the circumferential direction inward and outward.

As shown in fig. 1, 3 and 4, the exhaust gas treatment apparatus for an incinerator and a burner according to the present invention further includes a gasification unit 600 installed between the dry reaction unit 300 and the dust filtering and collecting unit 400, for gasifying ammonia water into gaseous ammonia and water vapor, thereby generating granular ammonium sulfite and ammonium sulfate. The gasification part 600 includes a gasification chamber 610, a dual gauntlet injection nozzle 630, a one-touch clamp 640, a heat storage part 650, and a tangential flow induction part 660.

The gasification chamber 610 has an exhaust gas inflow portion 611 formed at one side and an exhaust portion 612 for exhausting the mixed exhaust gas formed at the other side. The exhaust gas inflow part 611 may be formed of a pipe structure bent vertically and horizontally.

In particular, ammonium sulfate and ammonium sulfite, which are fine particulate matters having a particle size of 0.01 to 0.3 μm, are generated in the discharge portion 612 of the gasification chamber 610, and are discharged together with the exhaust gas.

The double gauntlet 620 is connected to the upper portion of the gasification chamber 610 and supplies ammonia water and compressed air therein separately.

The spray nozzles 630 are installed at the ends of the double gauntlet 620 to spray preheated ammonia and compressed air.

The spray nozzles 630 spray preheated ammonia water together with compressed air, so that ammonia water can be finely sprayed.

The spray nozzle 630 sprays ammonia water and compressed air at an angle of 15 to 20 degrees in the range of 2.0 to 3.0 bar. The reason for this is to increase the distribution range without interfering with the flow of the ammonia water and the compressed air.

The one-touch clamp 640 is coupled to an outer surface of the double gauntlet 620 such that the double gauntlet 620 is detachably coupled to the gasification chamber 610. The double gauntlet 620 is detachably coupled to the one-touch clamp 640 so that an assembling operation for coupling the double gauntlet 620 is quick and convenient and can be efficiently formed.

The heat storage part 650 fixes the double bank pipe 620 at the center of the gasification chamber 610 and transfers heat to the double bank pipe 620 to preheat ammonia water and compressed air. In particular, the heat stored in the exhaust gas flowing in together with the heat storage portion 650 is transferred to the heat storage portion 650 and the double bank 620, and the compressed air and the ammonia water can be preheated. Such a thermal storage portion 650 includes a housing 651, a spiral tube 652, a spiral guide 653, and a heater 654.

The case 651 is provided vertically in the exhaust gas inflow portion 611 as a cylindrical structure, and accommodates a heat medium therein.

A supply port 651a for supplying the heat medium is formed at an upper side of the housing 651, and a discharge port 651b for discharging the heat medium to the outside is formed at a lower side.

The spiral pipe body 652 is installed inside the casing 651, and penetrates the double drain 620 to the inside thereof.

The spiral guide 653 is formed in a spiral shape on the outer surface of the spiral tube body 652 to guide the heat medium to move in a spiral tube shape.

According to this structure, the flow direction of the heat medium is formed long while the movement of the heat medium is guided by the spiral flow path of the spiral guide 653 formed on the outer surface of the spiral pipe body 652, so that the double pipe 620 can be heated until the ammonia water and the compressed air are injected through the injection nozzle 630 installed at the end of the double pipe 620.

The heater 654 is installed on the outer surface of the spiral tube body 652 in a spiral winding manner and heats the heat medium.

This structure expands the contact area of the heater 654 heated by the external power source, not only improves the heat transfer efficiency to the heat medium flowing in the spiral pipe body 652, but also improves the heating speed, and thus the dual drain 620 can rapidly preheat the temperature of the ammonia water and the compressed air.

The tangential flow inducer 660 is installed at the upper inner side of the gasification chamber 610, mixes with ammonia water by centrifugal force of swirling flow of exhaust gas, and moves toward the lower portion of the gasification chamber 610. Such tangential flow inducer 660 comprises an intake conduit 661 and guide vanes 662.

The suction duct 661 is installed to communicate with the lower end of the exhaust gas inflow portion 611, and protrudes to form a spiral protrusion 661a on the inner circumferential surface.

The guide vane 662 is installed at an upper inner circumferential surface of the suction duct 661 and rectifies the flow of the exhaust gas.

That is, the vortex generation of the exhaust gas sucked into the tangential flow inducing part 660 is promoted to rotate in a vortex shape and to be swirled downward along the inner wall of the gasification chamber 610, and the retention time of the heat and the ammonia of the exhaust gas is maintained for a certain time, thereby completely decomposing into gaseous ammonia and water vapor.

On the other hand, the exhaust gas passing through the tangential flow inducer 660 is mixed with the aqueous ammonia injected from the injection nozzle 630 and moved to the lower part of the gasification chamber 610 having a vertical structure while rotating in the circumferential direction, and the remaining time of aqueous ammonia of 4 seconds or more is maintained, and ammonia (NHs) and water vapor (H ₂ O) are completely decomposed by the heat of the exhaust gas, and part of the gaseous ammonia reacts with sulfur trioxide (SOs) oxidized in the exhaust gas in the concentration range of 0.1 to 1.0% by sulfur dioxide (SO ₂), and as shown in chemical formulas (1) to (5) described later, is aggregated and collided with ammonium sulfate ((NH ₄)₂SO₄) which is a fine particulate matter having a particle size range of 0.01 to 0.3 μm, to generate a viscous particulate matter larger than ammonium sulfate, that is, ammonium sulfite (NH ₄HSO₄), and is discharged to the exhaust part 612 of the gasification chamber 610 together with the exhaust gas.

That is, sulfur dioxide and moisture are contained in the exhaust gas from the tangential flow inducer 660, and as shown in the following chemical formula, the reaction of sulfur trioxide formed by oxidizing sulfur dioxide with ammonia and moisture produces ammonium sulfite and ammonium sulfate as denitration catalyst salt substances.

(1)SO₂+1/2O₂-＞SO₃

(2)NH₃+SO₃+H₂O-＞NH₄HSO₄

(3)2NH₃+SO₃+H₂O-＞(NH₄)₂SO₄

(4)SO₃+H₂O-＞H₂SO₄

(5)H₂SO₄+NH₃->NH₄HSO₄

As shown in fig. 1, 5 and 6, the denitration catalyst 500 is connected to the filter dust collecting unit 400, and includes a denitration chamber 510, a denitration catalyst unit module 520, a rectifier 530, a foreign matter removing unit 540, and a dust collecting unit 550.

The denitration chamber 510 has a vane 511 for guiding the flow of exhaust gas flowing into the inside at an upper portion thereof, and has an openable door 512 at an outer side thereof.

The denitration chamber 510 is formed with an inflow port (not shown) into which exhaust gas flows and an exhaust port (not shown) from which exhaust gas is exhausted at the upper and lower portions, respectively, and is opened and closed at the outside by a door 512.

The denitration catalyst unit module 520 is installed inside the denitration chamber 510 with up-down isolation. The denitration catalyst unit module 520 accommodates a particulate (PELLET TYPE) catalyst, uses titania, γ -alumina, silica, or the like as a carrier, and uses vanadium, tungsten, molybdenum, iron, or the like as a catalytically active metal.

In the past, honeycomb catalysts have been used in many cases, but because of the nature of the equipment, there is a burden of unnecessary additional energy costs and there is a problem of insufficient installation space. To compensate for this problem, particulate catalysts have recently been used. The particulate catalyst also has denitration efficiency at low temperature, so there is no burden on extra energy costs, and much installation space is not required compared to the honeycomb type.

The rectifier 530 is installed at an upper inner portion of the denitration chamber 510, and exhaust gas guided through the vane 511 is uniformly distributed at an upper portion of the denitration catalyst unit module 520.

The foreign matter removing part 540 is installed at one side of the denitration chamber 510, and sprays air to the denitration catalyst unit module 520, which is transferred to the outside through the opened door 512, to remove foreign matters. The foreign matter removal unit 540 includes a fixing frame 541, a housing 542, a lift driving unit 543, an air jet nozzle 544, and an air supply unit.

The fixing frame 541 is formed by arranging various components in a rectangular frame shape. Preferably, the fixing frame 541 is fixed to or disposed close to one side of the denitration chamber 510.

The housing 542 is disposed inside the fixing frame 541, and has an opening 542a opened from one side to the other side so as to allow the denitration catalyst unit module 520 to be inserted.

On the other hand, a plurality of rollers 542b are arranged in order in the lateral direction in the lower portion of the inside of the housing 542 so as to support and guide the denitration catalyst unit module 520 put into the input port 542 a. In addition, a receiving space 542c for receiving the separated foreign matter is formed when the denitration catalyst unit module 520 is cleaned.

The roller 542b supports the lower surface of the denitration catalyst module 520 that moves in the transfer direction from the denitration chamber 510 side, and guides the transfer. The denitration catalyst unit module 520 transferred to the inlet 542a of the housing 542 enters the inlet 542a through the roller 542 b.

The elevation driving part 543 is installed at an upper portion of the fixing frame 541 and ascends or descends the housing 542. The elevation driving part 543 may be formed of a cylinder that elevates or lowers the housing 542 such that the housing 543 is closely attached to the side of the subject denitration catalyst unit module 520.

The air jet nozzles 544 are arranged on the wall surface of the inlet 542a of the housing 542. The air injection nozzle 544 performs a function of injecting air into the inlet 542 a.

The air supply portion 545 is connected to the air injection nozzles 544 by a pipe 546, and supplies air to the air injection nozzles 544.

The air supply portion 545 serves as a device that receives power to operate and generate air, and performs a similar or identical structure and function to the compressor. The operation of the air supply part 545 is controlled by a control part (not shown).

The air generated by the air supply portion 545 is injected into the inlet 542a through the air injection nozzle 544 communicating with the inlet 542a, and foreign matter adhering to the denitration catalyst unit module 520 injected into the inlet 542a is removed.

Preferably, the tube 546 is connected to the air distributor 547 so that air is partially supplied.

When the denitration catalyst unit module 520 enters the inlet 542a of the housing 542, the foreign matter removal unit 540 configured as described above operates the air supply unit 545, and simultaneously supplies air through the pipe 546 and the air distributor 547, and the supplied air is injected through the air injection nozzle 544. The air injected through the air injection nozzles 544 separates foreign matters stuck to the denitration catalyst unit module 520 and drops into a dust collection part 550 described later. Accordingly, the denitration catalyst module 520 is not replaced and regenerated and maintains sustainable performance, so that it can be semi-permanently used, thus having an advantage of reducing management costs.

The dust collection part 550 is installed below the foreign matter removal part 540 to collect the foreign matters removed from the foreign matter removal part 540. The dust collecting part 550 includes a dust collecting housing 551, a suction fan 552, a suction pipe 553, and a discharge pipe 554.

The dust collection housing 551 has a receiving space formed therein, and a tube insertion hole 551a is formed at an upper side thereof.

The suction fan 552 is mounted on the upper portion of the dust collection housing 551, sucks in the foreign matters contained in the housing 542 of the foreign matter removal unit 540, and discharges the foreign matters to the dust collection housing 551.

The suction fan 552 serves as a driving source for sucking foreign matters removed during the cleaning of the denitration catalyst unit module 520, and thus has a fan structure inside, and a suction port is formed on one side and a discharge port is formed on the other side.

One end of the suction pipe 553 is connected to the accommodating space 542c of the housing 542, and the other end is connected to the suction port of the suction fan 552.

One end of the drain 554 is connected to the drain of the suction fan 552, and the other end is connected to the accommodating space of the dust collecting housing 551.

The above-described structure is separated when cleaning the denitration catalyst unit module 520, and absorbs and collects foreign matters in the accommodation space 542c of the drop-off case 542, thereby preventing contamination of the surrounding air by the foreign matters.

The invention has been described with reference to the drawings and centered on preferred embodiments, but it will be obvious to those skilled in the art that various modifications can be made without departing from the scope of the invention as described. Accordingly, the scope of the invention should be construed by the appended claims including many examples of such modifications.

[ Description of the symbols ]

100: The combustion apparatus 200: boiler

300: Dry reaction unit 400: filtering dust collection part

410: Dust collector 420: bag filter

421: Fine porous polytetrafluoroethylene film 500: denitration catalyst part

510: Denitration chamber 511: blade

512: Door 520: denitration catalytic unit module

530: Rectifier 540: foreign matter removing part

541: Fixing frame 542: shell body

542A: input port 542b: roller

542C: accommodation space 543: lifting driving part

544: Air jet nozzle 545: air supply unit

546: Tube 547: air distributor

550: Dust collection unit 551: dust collecting shell

551A: tube insertion hole 552: air suction fan

553: Suction tube 554: discharge pipe

600: Gasification unit 610: gasification chamber

611: Exhaust gas inflow portion 612: discharge part

620: Double gauntlet 630: spray nozzle

640: One touch clamp 650: thermal storage unit

651: A housing 651a: supply port

651B: discharge port 652: spiral tube body

653: Screw guide 654: heater

660: Tangential flow induction unit 661: suction catheter

661A: projection 662: guide vane

670: Ammonia water supply unit 680: compressed air supply unit

700: Blower 800: chimney

Claims

1. An exhaust gas treatment device for an incinerator and a combustion furnace, comprising:

A boiler (200) connected to the incinerator and the combustion equipment (100) of the combustion furnace;

A dry reaction unit (300) which is connected to the boiler (200) and removes harmful acid gases;

A filter dust collection unit (400) which is connected to the dry reaction unit (300) and filters dust of the exhaust gas, and removes nitrogen oxides and dioxin; and

A denitration catalyst unit (500) for performing a denitration reaction by a catalyst on the exhaust gas passing through the dust collection unit (400),

The exhaust gas treatment device of the incinerator and the combustion furnace further comprises:

And a gasification unit (600) which is installed between the dry reaction unit (300) and the filtration dust collection unit (400) and gasifies the ammonia water into gaseous ammonia and water vapor to produce granular ammonium sulfite and ammonium sulfate.

2. The exhaust gas treatment device of an incinerator and a burner according to claim 1, wherein the gasification unit (600) includes:

A gasification chamber (610) having an exhaust gas inflow portion (611) formed on one side and an exhaust portion (612) for exhausting the mixed exhaust gas formed on the other side;

A double-row pipe (620) connected to the upper part of the gasification chamber (610) and having ammonia water and compressed air separately supplied therein;

a spray nozzle (630) installed at an end of the double gauntlet (620) to spray preheated ammonia water and compressed air;

a one touch clamp (640) coupled to an outer surface of the double gauntlet (620) such that the double gauntlet (620) is detachably coupled to the gasification chamber (610);

A heat storage part (650) for fixing the double gauntlet (620) at the center of the gasification chamber (610) and transferring heat to the double gauntlet (620) to preheat ammonia and compressed air; and

And a tangential flow inducing part (660) installed at the upper inner side of the gasification chamber (610), and mixing with ammonia water by centrifugal force of the rotational flow of the exhaust gas and moving toward the lower part of the gasification chamber (610).

3. The incinerator and combustion furnace exhaust gas treatment device according to claim 2, wherein an ammonia water supply unit (670) is connected to one side of the gasification chamber (610), the ammonia water supply unit (670) quantitatively supplies ammonia water stored in an ammonia water storage tank,

The other side of the gasification chamber (610) is connected with a compressed air supply part (680), and the compressed air supply part (680) supplies the compressed air which is quantitatively regulated.

4. The exhaust gas treatment device for an incinerator and a burner according to claim 2, wherein ammonium sulfate and ammonium sulfite of fine particulate matters having a particle size of 0.01 to 0.3 μm are generated in the exhaust part (612) of the gasification chamber (610) and are exhausted together with the exhaust gas.

5. The exhaust gas treatment device of an incinerator and a burner according to claim 2, wherein the heat storage unit (650) includes:

A cylindrical casing (651) which is vertically arranged inside the exhaust gas inflow portion (611) and accommodates a heat medium therein;

a spiral pipe body (652) which is installed inside the casing (651) and penetrates the double drain pipe (620) into the inside thereof;

A spiral guide (653) formed in a spiral shape on an outer surface of the spiral tube body (652) for guiding the heat medium to move in a spiral tube shape; and

A heater (654) is installed on the outer surface of the spiral tube body (652) in a spiral winding manner and heats the heat medium.

6. The exhaust gas treatment device for an incinerator and a burner according to claim 5, wherein a supply port (651 a) for supplying a heat medium is formed on an upper side of the casing (651), and a discharge port (651 b) for discharging the heat medium to the outside is formed on a lower side.

7. The incinerator and combustion furnace exhaust gas treatment device according to claim 2, wherein the tangential flow inducer (660) comprises:

A suction duct (661) which is installed to communicate with the lower end of the exhaust gas inflow part (611) and protrudes on the inner circumferential surface to form a spiral protrusion (661 a);

And guide vanes (662) which are installed on the upper inner peripheral surface of the suction duct (661) and which rectify the flow of the exhaust gas.

8. The exhaust gas treatment device for an incinerator and burner according to claim 2, wherein the spray nozzle (630) sprays ammonia water and compressed air at an angle of 15 to 20 degrees in the range of 2.0 to 3.0 bar.

9. The exhaust gas treatment device for an incinerator and a burner according to claim 1, wherein the filter dust collection unit (400) includes:

A dust collector (410) in which a plurality of bag filters (420) are arranged;

A bag filter (420) is provided with a fine porous polytetrafluoroethylene film (421) having a pore size in the range of 0.05-2.0 [ mu ] m laminated on one side.

10. The exhaust gas treatment device for an incinerator and a burner according to claim 1, wherein the denitration catalyst (500) includes:

A denitration chamber (510) having a vane (511) for guiding the flow of exhaust gas flowing into the inside at the upper part of the inside and a door (512) capable of opening and closing at the outside;

A denitration catalyst unit module (520) installed in the denitration chamber (510) so as to be vertically isolated;

A rectifier (530) installed at an upper inner portion of the denitration chamber (510), and exhaust gas guided through the vane (511) is uniformly distributed at an upper portion of the denitration catalyst unit module (520);

a foreign matter removing part (540) installed at one side of the denitration chamber (510) and spraying air to the denitration catalyst unit module (520) which is transferred to the outside through the opened door (512) to remove foreign matters; and

And a dust collection unit (550) installed below the foreign matter removal unit (540) for collecting the foreign matters removed from the foreign matter removal unit (540).

11. The exhaust gas treatment device for an incinerator and a burner according to claim 10, wherein the foreign matter removal unit (540) includes:

A fixed frame (541) having a square frame shape;

a housing (542) which is disposed inside the fixed frame (541) and in which an inlet (542 a) is opened from one side to the other side so as to feed the denitration catalyst unit module (520);

A lifting drive unit (543) which is mounted on the upper part of the fixed frame (541) and which lifts or lowers the housing (542);

A plurality of air injection nozzles (544) arranged on the wall surface of the inlet (542 a) of the housing (542); and

An air supply unit (545) connected to the air injection nozzle (544) by a pipe (546) and supplying air to the air injection nozzle (544).

12. The exhaust gas treatment device for an incinerator and a burner according to claim 11, wherein a plurality of rollers (542 b) are arranged in order in the lateral direction at the inner lower part of the housing (542) so as to support and guide the denitration catalyst unit module (520) put into the input port (542 a), and a receiving space (542 c) for receiving foreign matters separated when cleaning the denitration catalyst unit module (520) is formed.

13. The incinerator and burner exhaust gas treatment device according to claim 11, wherein the pipe (546) is connected to an air distributor (547) so as to be partly supplied with air.

14. The exhaust gas treatment device of an incinerator and a burner according to claim 10, wherein the dust collection unit (550) includes:

A dust collection housing 551 having an accommodating space formed therein and a pipe insertion hole 551a formed at an upper side;

a suction fan (552) which is mounted on the upper part of the dust collection housing (551) and sucks in the foreign matter contained in the housing (542) of the foreign matter removal unit (540) and discharges the foreign matter to the dust collection housing (551);

A suction pipe (553) one end of which is connected to the housing space (542 c) of the housing (542), and the other end of which is connected to the suction port of the suction fan (552); and

And a discharge pipe 554 having one end connected to the discharge port of the suction fan 552 and the other end connected to the accommodating space of the dust collecting case 551.