CN104548928B - Selective catalytic reduction denitration method and selective catalytic reduction denitration system - Google Patents
Selective catalytic reduction denitration method and selective catalytic reduction denitration system Download PDFInfo
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- CN104548928B CN104548928B CN201410792254.1A CN201410792254A CN104548928B CN 104548928 B CN104548928 B CN 104548928B CN 201410792254 A CN201410792254 A CN 201410792254A CN 104548928 B CN104548928 B CN 104548928B
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Abstract
The invention discloses a selective catalytic reduction denitration method and a selective catalytic reduction denitration system. The method comprises the following steps: atomizing ammonia water (forming ammonia gas) by utilizing an ultrasonic generator, mixing the mist-type ammonia water (ammonia gas) with smoke containing nitric oxide, and reducing the mixed smoke to nitrogen and water in the existence of a catalyst. The selective catalytic reduction denitration system comprises a smoke inlet channel and a selective catalytic reduction denitration device, wherein the smoke inlet channel is provided with at least one ultrasonic generator, an ammonia water inlet of the ultrasonic generator is communicated with an ammonia water source through an ammonia water pump, and an ammonia water atomizing hole of the ultrasonic generator is arranged in the smoke inlet channel. According to the method and system, the ammonia water molecular structure can be scattered by utilizing electronic high-frequency vibration through the high-frequency resonance oscillation of an atomizing sheet in an ultrasonic atomizing way, the natural drifting mist is generated, no heating or chemical reagent is needed, ammonia gas can be formed without consumption of heat energy, and the ammonia gas and the smoke can be adequately mixed.
Description
Technical field
The present invention relates to the method for denitration containing nitrogen oxide containing gas and its system, more particularly to a kind of selective catalysis
Reduction method of denitration and its system.
Background technology
Cement manufacture and thermal power generation etc. are all highly energy-consuming high pollutive industries.In clinker production process, due to making
With coal as fuel, substantial amounts of dust and nitrogen oxides can be produced in preheater and dore furnace running.Ripe denitration skill
Art mainly has low NO, grading combustion technology（SCC）、SNCR（Non-selective catalytic reduction technology）And SCR technology.Low nitrogen
Burner, fractional combustion and SNCR technologies have that complex operation, denitration efficiency are low, operating cost is high and the escaping of ammonia is high asks
Topic, it is difficult to meet increasingly strict emission limits of nitrogen oxides and require.
SCR (SCR) denitration technology is a kind of efficient denitration technology, and thermal power plant is mainly used at present,
Catalyst module is its core technology, and cost accounts for the 40% of engineering.Using temperature range at 300-400 DEG C, catalyst module
Mainly with V205、WO3、TiO2Based on, its principle is by spray ammonia or ammonia in flue gas, NO in flue gasXIt is reduced into N2With
Water vapour (H2O).Denitration efficiency general reachable 80% to 90%, even more high, NOXConcentration of emission can be less than 200 mg/m3.Due to
Its optimal reaction temperature interval just at high dirt section, alkali metal, moisture and element sulphur in flue dust, arsenic element and the factor such as at a high speed
The problems such as often resulting in catalyst module poisoning, blocking and wear and tear, causes catalyst module short life, operation renewal cost it is high and
The problems such as affecting upstream device.
High temperature SCR technology is mainly applied in power plant, but 300-400 DEG C of cement plant section flue gas is in preheater exit, flue gas
Composition alkalescence is higher, component is more complicated, and dust content is higher, ash-clearing technology and catalyst module is required higher.It is limited to
High concentrate dust, and contain alkali metal, easily make catalyst module abrasion, blocking and be poisoned, once investment and catalyst module take
High factor is used, its engineering is have impact on and is promoted.
On 02 19th, 2014, Patent Office of the People's Republic of China disclosed a patent application of the applicant, Publication No.
CN103585885A, entitled " low-temperature denitration catalyst module and cement kiln low-temperature selective catalytic reduction denitration system " should
Cement kiln low-temperature selective catalytic reduction denitration system includes cleaner unit, ammonia source, selective catalytic reduction denitration device and cigarette
Chimney；The selective catalytic reduction denitration device is that the cryogenic selective containing low-temperature denitration catalyst module as described above is urged
Change reduction denitrification apparatus；The outlet respectively with the cleaner unit of the entrance of the low-temperature selective catalytic reduction denitration device and ammonia
The outlet of source of the gas；The outlet of the low-temperature selective catalytic reduction denitration device is connected with the entrance of the chimney.It is described
Ammonia source includes urea pyrolysis device；The top of the urea pyrolysis device is the carbamide decomposition chamber for containing carbamide, and bottom is heat exchange
Device；The entrance of the heat exchanger is connected with the wind regime of cement kiln tertiary air；The outlet of the heat exchanger divides with cement kiln
Solution stove connection.The entrance of the low-temperature selective catalytic reduction denitration device is gone out respectively by ammonia-spraying grid with the cleaner unit
Mouth and the outlet in ammonia source.The outlet in the ammonia source is de- with the low-temperature selective catalytic reduction respectively by blender
The outlet of the entrance of nitre device and the cleaner unit；The blender has dilution air.
As can be seen here, the original due to above-mentioned cement kiln low-temperature selective catalytic reduction denitration system using carbamide as reducing agent
Material, needs to carry out carbamide pyrolysis generation ammonia by urea pyrolysis device, in addition it is also necessary to dilute ammonia by blender, with greater need for
The ammonia after dilution is mixed with flue gas by ammonia-spraying grid, needs to consume substantial amounts of heat energy, and system structure is more complicated.Even if
Raw material with liquefied ammonia as reducing agent, it is also desirable to by liquid ammonia gasification device to liquid ammonia gasification, by air mix facilities and mixing arrangement
Ammonia is diluted, is mixed the ammonia after dilution with flue gas by ammonia-spraying grid, need to consume substantial amounts of heat energy, and system structure
It is more complicated.
The content of the invention
The invention solves the problems that a technical problem be to provide a kind of selective-catalytic-reduction denitrified method, the method is not required to
Ammonia is formed by consuming heat energy to be sufficiently mixed ammonia with flue gas.
The invention solves the problems that another technical problem be to provide a kind of selective-catalytic-reduction denitrified system, the system is not
But form ammonia by heat energy need not be consumed to be sufficiently mixed ammonia with flue gas, and, system structure is simpler.
For method, in order to solve said one technical problem, the selective-catalytic-reduction denitrified method of the present invention is
Supersonic generator is first passed through by ammonia atomization（Form ammonia）, then by vaporific ammonia（That is ammonia）With containing nitrogen oxides
Flue gas mixes, and mixed flue gas is reduced into nitrogen and water in the presence of catalyst.
The concentration of the ammonia is 15%-25%（Percentage by weight）.
The concentration of the ammonia is 20%（Percentage by weight）.
It is in temperature 140-150 DEG C that the mixed flue gas is reduced into nitrogen and the process of water in the presence of catalyst
Under carry out.
The mixed flue gas is reduced into the process of nitrogen and water in the presence of catalyst to be entered at 145 DEG C of temperature
Capable.
The selective-catalytic-reduction denitrified method of the present invention has the advantages that compared with prior art.
1st, the technical program is as a result of first passing through supersonic generator by ammonia atomization（Form ammonia）, then will be vaporific
Ammonia（That is ammonia）Mix with the flue gas containing nitrogen oxides, mixed flue gas is reduced into nitrogen in the presence of catalyst
With the technological means of water, so, can be by way of ultrasonic atomization, using electronics high frequency oscillation, by the high frequency of atomizing piece
Resonance, ammonia molecular structure is broken up and the elegant water smoke of nature is produced, and is not required to heat or add any chemical reagent, the method
Ammonia is formed by heat energy need not be consumed to be sufficiently mixed ammonia with flue gas, due to atomization of the supersonic generator to ammonia
Ultrahigh in efficiency, so, power consumption is minimum.
2nd, the technical program is 15%-25% as a result of the concentration of the ammonia（Percentage by weight）Technological means,
So, it is ensured that the ammonia after atomization safely and effectively mixes with the flue gas containing nitrogen oxides.
3rd, the technical program is 20% as a result of the concentration of the ammonia（Percentage by weight）Technological means, so,
Can ensure that the ammonia after atomization safely and efficiently mixes with the flue gas containing nitrogen oxides.
4th, the technical program is reduced into nitrogen and water as a result of the mixed flue gas in the presence of catalyst
Process be the technological means carried out at temperature 140-150 DEG C, so, the premise that greatly improve can the denitration efficiency of flue gas
Under, the service life of catalyst is greatly improved, greatly reduce denitration cost.
5th, the technical program is reduced into nitrogen and water as a result of the mixed flue gas in the presence of catalyst
Process be the technological means carried out at 145 DEG C of temperature, so, the denitration efficiency of flue gas can be made to reach with the ratio of denitration cost
Highest, and meet the discharge standard of flue gas.
For system, in order to solve above-mentioned another technical problem, the selective-catalytic-reduction denitrified system of the present invention,
Including flue and selective catalytic reduction denitration device, the outlet flue of the flue is selective-catalytic-reduction denitrified with described
The smoke inlet connection of device, the flue is at least provided with a supersonic generator, the ammonia of the supersonic generator
Import is connected by aqua ammonia pump with ammonia source, and the ammonia atomization hole position of the supersonic generator is in the flue.
The main body of the supersonic generator is in the form of a column, and the front center of the columnar body is provided with hollow long-neck, hollow
The termination of long-neck is provided with high frequency oscillation cone, and the ammonia atomization hole has multiple, and multiple ammonia atomization holes are circumferentially uniform
Be distributed on the side wall of hollow long-neck termination；The front end of the columnar body extends radially outward to form ring flange, the method
Circumferentially distributed on blue disk to have fixing hole, correspondingly, the side wall of the flue is distributed with supersonic generator installing hole, along
The circumferential distribution of the supersonic generator installing hole has threaded securing bores, the high frequency oscillation cone of the supersonic generator and ammonia
Water atomization hole is entered in the flue through the supersonic generator installing hole, the side of the ring flange and the flue
Gask-O-Seal is provided between wall, the supersonic generator is with the flue by screw by the ring flange
Fixing hole is fixedly connected with the threaded securing bores of flue side wall；Or, the front portion of the columnar body is received radially inward
Contracting forms cylinder and forms shoulder with the rear portion of the columnar body, and the side wall of the cylinder is provided with screw thread, correspondingly, institute
The side wall for stating flue is distributed with supersonic generator threaded mounting hole, the high frequency oscillation cone of the supersonic generator and ammonia
Orifice is entered in the flue through the supersonic generator threaded mounting hole, the side of the shoulder and the flue
Gask-O-Seal is provided between wall, the supersonic generator is threadably secured with the flue and is connected.
The circular in cross-section of the flue, the supersonic generator has multiple；Multiple supersonic generators
Circumference along the same cross section of the flue is evenly distributed, and the high frequency oscillation of supersonic generator cone is towards described
The axle center of flue；Or, multiple supersonic generators are divided into multigroup, and multigroup supersonic generator is respectively along institute
The circumferentially distributed of flue varying cross-section is stated, the high frequency oscillation of the supersonic generator bores the axle towards the flue
The heart.
Many exchange devices are provided between the supersonic generator and the aqua ammonia pump, many exchange devices have an ammonia
Import and multiple ammonia are exported, and one ammonia import is connected with the outlet of the plurality of ammonia, the plurality of ammonia outlet
It is each configured with valve, the ammonia outlet of one ammonia import and the aqua ammonia pump, the plurality of ammonia outlet point
Not with the ammonia inlet communication of the supersonic generator.
The smoke inlet of the flue is connected with the outlet flue of sack cleaner, the selective catalytic reduction denitration device
Outlet flue connected with the smoke inlet of chimney by air-introduced machine, the smoke inlet of the outlet flue of the sack cleaner and the chimney
Connected by bypass flue, by-pass damper, the supersonic generator are respectively arranged near its two ends on the bypass flue
Effusion meter and ammonia filter are serially connected between the ammonia source, the selective catalytic reduction denitration device includes steel construction
Container, is provided with gas approach guiding device, even gas distribution device, catalyst module layer and supporting construction, is placed with and urges in container
The spare level of agent module, is provided with maintenance installing hole and soot blower on wall of a container, the size of the catalyst module is
150mm × 150mm × 860mm, according to smoke detecting board-like or corrugated plate dst is chosen, and the component of catalyst module is V2O5、
MoO3、TiO2And trace element, the proportioning between each component is V2O5Account for 0.1%-3%（Percentage by weight）, MoO3Account for 0.1%-10%
（Percentage by weight）, WO3Account for 0.1%-5%（Percentage by weight）,TiO2Account for 80%（Percentage by weight）, trace element accounts for 10%（Weight
Amount percentage ratio）, the frequency of the supersonic generator is 15-55khz, and the power of the supersonic generator is 30-500W,
The atomizing piece of the supersonic generator is ceramic atomizing piece.
The selective-catalytic-reduction denitrified system of the present invention has the advantages that compared with prior art.
1st, the technical program as a result of the flue at least provided with a supersonic generator, the ultrasound wave
The ammonia import of generator is connected by aqua ammonia pump with ammonia source, the ammonia atomization hole position of the supersonic generator in it is described enter
Technological means in flue, so, can be by way of ultrasonic atomization, using electronics high frequency oscillation, by the height of atomizing piece
Frequency resonance, ammonia molecular structure is broken up and the elegant water smoke of nature is produced, and is not required to heat or add any chemical reagent, the party
Method forms ammonia and is sufficiently mixed ammonia with flue gas by need not consuming heat energy, due to mist of the supersonic generator to ammonia
Change ultrahigh in efficiency, so, power consumption is minimum.Due to supersonic generator this into the parts such as the ammonia-spraying grid than prior art into
Body is much lower, and the structure of supersonic generator is also simply too much than the part such as ammonia-spraying grid of prior art, so, can drop significantly
The manufacturing cost of the low system and structure of system is simpler.
2nd, the technical program is in the form of a column as a result of the main body of the supersonic generator, in the front end of the columnar body
Centre is provided with hollow long-neck, and the termination of hollow long-neck is provided with high frequency oscillation cone, and the ammonia atomization hole has multiple, multiple described
Ammonia atomization hole is circumferentially evenly distributed on the side wall of hollow long-neck termination；Radially prolong the front end of the columnar body
Stretch to form ring flange, circumferentially distributed on the ring flange to have fixing hole, correspondingly, the side wall of the flue is distributed with ultrasound
Wave producer installing hole, the circumferential distribution along the supersonic generator installing hole has threaded securing bores, and the ultrasound wave is sent out
The high frequency oscillation cone of raw device and ammonia atomization hole are entered in the flue through the supersonic generator installing hole, the method
Gask-O-Seal is provided between blue disk and the side wall of the flue, the supersonic generator passes through spiral shell with the flue
The technological means that nail is fixedly connected by the fixing hole on the ring flange with the threaded securing bores of flue side wall, institute
To install, change and safeguard that supersonic generator is very convenient.When the front portion for employing the columnar body is shunk radially inward
Form cylinder and form shoulder with the rear portion of the columnar body, the side wall of the cylinder is provided with screw thread, correspondingly, described
The side wall of flue is distributed with supersonic generator threaded mounting hole, the high frequency oscillation cone of the supersonic generator and ammonia mist
Change hole to enter in the flue through the supersonic generator threaded mounting hole, the side wall of the shoulder and the flue
Between be provided with Gask-O-Seal, the supersonic generator is threadably secured the technological means being connected with the flue,
Then install, change and safeguard that supersonic generator is convenient.
3rd, as a result of the circular in cross-section of the flue, the supersonic generator has many to the technical program
It is individual；Multiple supersonic generators are evenly distributed along the circumference of the same cross section of the flue, and the ultrasound wave is sent out
The high frequency oscillation of raw device bores the technological means in the axle center towards the flue, so, ammonia can be made equably to mix with flue gas.
When employ multiple supersonic generators be divided into it is multigroup, multigroup supersonic generator respectively along the flue not
With the circumferentially distributed of cross section, the high frequency oscillation of the supersonic generator bores the technology handss in the axle center towards the flue
Section, then can be such that ammonia is further sufficiently mixed with flue gas.
4th, the technical program is as a result of being provided with many exchange devices between the supersonic generator and the aqua ammonia pump,
Many exchange devices have an ammonia import and the outlet of multiple ammonia, one ammonia import and the plurality of ammonia outlet phase
Connection, the plurality of ammonia outlet is each configured with valve, and one ammonia import connects with the ammonia outlet of the aqua ammonia pump
It is logical, the plurality of ammonia outlet respectively with the technological means of the ammonia inlet communication of the supersonic generator, so, can basis
Practical situation is implemented to control to supersonic generator.
5th, the technical program is connected as a result of the smoke inlet of the flue with the outlet flue of sack cleaner, described
The technological means that the outlet flue of selective catalytic reduction denitration device is connected by air-introduced machine with the smoke inlet of chimney, so, take off
Nitre reaction can be carried out at a lower temperature, and exhaust gas volumn greatly reduces, and catalyst volume accordingly reduces, and reactor volume is also corresponding
Ground reduces, and abrasion of the flue gas to catalyst reduces, and the life-span of catalyst greatly prolongs, and the use cost of catalyst is substantially reduced.
Connected by bypass flue with the smoke inlet of the chimney as a result of the outlet flue of the sack cleaner again, the bypass
The technological means of by-pass damper are respectively arranged with flue near its two ends, so, it is tight when catalyst change and maintenance etc. is run into
Anxious situation can select to open by-pass damper, make flue gas be directly discharged into chimney.Due also to employ the supersonic generator with
Effusion meter and ammonia filter being serially connected between the ammonia source, so, not only can be conducive to controlling the flow of ammonia, and
And, it is also prevented from supersonic generator and blocks.Include as a result of the selective catalytic reduction denitration device again
Steel construction container, be provided with container gas approach guiding device, even gas distribution device, catalyst module layer and supporting construction,
The spare level of catalyst module is placed with, the technological means of maintenance installing hole and soot blower are provided with wall of a container, so, have
It is convenient that deashing and maintenance are implemented to selective catalytic reduction denitration device beneficial to de- efficiency is improved.More urge as a result of described
The size of agent module is 150mm × 150mm × 860mm, and according to smoke detecting board-like or corrugated plate dst, catalyst module are chosen
Component be V2O5、MoO3、TiO2And trace element, the proportioning between each component is V2O5Account for 0.1%-3%（Percentage by weight）,
MoO3Account for 0.1%-10%（Percentage by weight）, WO3Account for 0.1%-5%（Percentage by weight）,TiO2Account for 80%（Percentage by weight）, it is micro-
Secondary element accounts for 10%（Percentage by weight）Technological means, so, not only denitration reaction can be carried out at temperature 140-150 DEG C,
On the premise of greatly improving the denitration efficiency of flue gas, the service life of catalyst is greatly improved, greatly reduces denitration cost,
Moreover, it is also possible to carry out denitration reaction at 145 DEG C of temperature, the denitration efficiency of flue gas can be made to reach most with the ratio of denitration cost
Height, and meet the discharge standard of flue gas.Finally, due to the frequency for employing the supersonic generator is 15-55khz, it is described
The power of supersonic generator is 30-500W, and the atomizing piece of the supersonic generator is the technological means of ceramic atomizing piece, institute
Can further improve denitration efficiency.
Description of the drawings
The selective-catalytic-reduction denitrified method and its system of the present invention are made with reference to the accompanying drawings and detailed description
It is described in further detail.
Fig. 1 is the structural representation of the selective-catalytic-reduction denitrified system of the present invention.
Fig. 2 is the first mounting structure schematic diagram between supersonic generator and flue in Fig. 1.
Fig. 3 is second mounting structure schematic diagram between supersonic generator and flue in Fig. 1.
Fig. 4 is to look from the axis direction of flue, and supersonic generator distributed architecture on flue shows in Fig. 1
It is intended to.
Fig. 5 is the circumferentially deploying schematic diagram of supersonic generator distributed architecture on flue in Fig. 1.
Fig. 6 is the overlooking the structure diagram of many exchange devices in Fig. 1.
Specific embodiment
As shown in figure 1, the selective-catalytic-reduction denitrified method of present embodiment is to first pass through supersonic generator 3 by ammonia
Water atomization（Form ammonia）, then by vaporific ammonia（That is ammonia）Mix with the flue gas containing nitrogen oxides, mixed flue gas
Nitrogen and water are reduced in the presence of catalyst.
Present embodiment is as a result of first passing through supersonic generator by ammonia atomization（Form ammonia）, then will be vaporific
Ammonia（That is ammonia）Mix with the flue gas containing nitrogen oxides, mixed flue gas be reduced in the presence of catalyst nitrogen and
The technological means of water, so, can be by way of ultrasonic atomization, using electronics high frequency oscillation, by the harmonic high frequency of atomizing piece
Shake, ammonia molecular structure is broken up and the elegant water smoke of nature is produced, be not required to heat or add any chemical reagent, the method is not
Formation ammonia is sufficiently mixed ammonia with flue gas by needing to consume heat energy, because atomization of the supersonic generator to ammonia is imitated
Rate is high, so, power consumption is minimum.
Improve as one kind of present embodiment, the concentration of the ammonia is 15%-25%（Percentage by weight）.
Present embodiment is 15%-25% as a result of the concentration of the ammonia（Percentage by weight）Technological means, institute
With, it is ensured that the ammonia after atomization safely and effectively mixes with the flue gas containing nitrogen oxides.
Further improve as present embodiment, the concentration of the ammonia is 20%（Percentage by weight）.
Present embodiment is 20% as a result of the concentration of the ammonia（Percentage by weight）Technological means, so, can
Guarantee that the ammonia after being atomized safely and efficiently mixes with the flue gas containing nitrogen oxides.
Further improve as present embodiment, the mixed flue gas is reduced into nitrogen in the presence of catalyst
The process of gas and water is carried out at temperature 140-150 DEG C.
Present embodiment is reduced into nitrogen and water as a result of the mixed flue gas in the presence of catalyst
Process is the technological means carried out at temperature 140-150 DEG C, so, the premise that greatly improve can the denitration efficiency of flue gas
Under, the service life of catalyst is greatly improved, greatly reduce denitration cost.
Also further improve as present embodiment, the mixed flue gas is reduced into nitrogen in the presence of catalyst
The process of gas and water is carried out at 145 DEG C of temperature.
Present embodiment is reduced into nitrogen and water as a result of the mixed flue gas in the presence of catalyst
Process is the technological means carried out at 145 DEG C of temperature, so, the denitration efficiency of flue gas can be made to reach most with the ratio of denitration cost
Height, and meet the discharge standard of flue gas.
As shown in Figures 1 to 6, the selective-catalytic-reduction denitrified system of present embodiment, including flue 1 and selectivity
Catalytic reduction denitration device 2, the outlet flue of the flue 1 connects with the smoke inlet of the selective catalytic reduction denitration device 2
Logical, the flue is provided with a supersonic generator 3, it is of course also possible to be provided with multiple supersonic generators 3.It is described
The ammonia import of supersonic generator 3 is connected by aqua ammonia pump 4 with ammonia source 5, the ammonia atomization hole of the supersonic generator 3
3-4 is located in the flue 1.
Present embodiment as a result of the flue at least provided with a supersonic generator, send out by the ultrasound wave
The ammonia import of raw device is connected by aqua ammonia pump with ammonia source, the ammonia atomization hole position of the supersonic generator in it is described enter cigarette
Technological means in road, so, can be by way of ultrasonic atomization, using electronics high frequency oscillation, by the high frequency of atomizing piece
Resonance, ammonia molecular structure is broken up and the elegant water smoke of nature is produced, and is not required to heat or add any chemical reagent, the method
Ammonia is formed by heat energy need not be consumed to be sufficiently mixed ammonia with flue gas, due to atomization of the supersonic generator to ammonia
Ultrahigh in efficiency, so, power consumption is minimum.Due to supersonic generator this into the part adult such as ammonia-spraying grid than prior art
Much lower, the structure of supersonic generator is also simply too much than the part such as ammonia-spraying grid of prior art, so, can substantially reduce
The manufacturing cost of the system and structure of system is simpler.
Improve as one kind of present embodiment, as shown in Fig. 2 main body 3-1 of the supersonic generator 3 is in the form of a column,
The front center of columnar body 3-1 is provided with hollow long-neck 3-2, and the termination of hollow long-neck 3-2 is provided with high frequency oscillation cone 3-
3, the ammonia atomization hole 3-4 has multiple, and multiple ammonia atomization hole 3-4 are circumferentially evenly distributed in hollow long-neck 3-2
On the side wall of termination；The front end of columnar body 3-1 extends radially outward to form ring flange 3-5, edge on the ring flange 3-5
Circumferentially distributed to have fixing hole, correspondingly, the side wall of the flue 1 is distributed with supersonic generator installing hole, surpasses along described
The circumferential distribution of sonic generator installing hole has threaded securing bores, the high frequency oscillation cone 3-3 of the supersonic generator 3 and ammonia
Orifice 3-4 through the supersonic generator installing hole enter the flue 1 in, the ring flange 3-5 and it is described enter cigarette
Gask-O-Seal 3-6 is provided between the side wall in road 1, the supersonic generator 3 is borrowed with the flue 1 by screw 3-7
The fixing hole helped on the ring flange 3-5 is fixedly connected with the threaded securing bores of the side wall of the flue 1.As can be seen from Figure 2,
The central authorities of the main body 3-1 rear end of the supersonic generator 3 are provided with electrode, and the electrode is electrically connected with tuner 3-9；It is described super
The ammonia import of sonic generator 3 is arranged on the side wall of main body 3-1 of the supersonic generator 3.It is of course also possible to be such as figure
Shown in 3, the front portion of columnar body 3-1 shrink radially inward to be formed cylinder 3-8 and with the rear portion shape of columnar body 3-1
Into shoulder, the side wall of the cylinder 3-8 is provided with screw thread, and correspondingly, the side wall of the flue 1 is distributed with ultrasound wave generation
Device threaded mounting hole, the high frequency oscillation of the supersonic generator 3 is bored 3-3 and ammonia atomization hole 3-4 and is sent out through the ultrasound wave
Raw device threaded mounting hole is entered in the flue 1, and between the side wall of the shoulder and the flue 1 ring packing is provided with
Pad 3-6, the supersonic generator 3 is threadably secured with the flue 1 and is connected.As can be seen from Figure 3, the ultrasound wave
The side wall of main body 3-1 of generator 3 is provided with electrode, and the electrode is electrically connected with tuner 3-9；The supersonic generator 3
Ammonia import be arranged on the central authorities of the main body 3-1 rear end of the supersonic generator 3.
Present embodiment is in the form of a column as a result of the main body of the supersonic generator, the front center of the columnar body
Hollow long-neck is provided with, the termination of hollow long-neck is provided with high frequency oscillation cone, and the ammonia atomization hole has multiple, multiple ammonia
Water atomization hole is circumferentially evenly distributed on the side wall of hollow long-neck termination；The front end of the columnar body extends radially outward
Ring flange is formed, circumferentially distributed on the ring flange to have fixing hole, correspondingly, the side wall of the flue is distributed with ultrasound wave
Generator installing hole, the circumferential distribution along the supersonic generator installing hole has threaded securing bores, and the ultrasound wave occurs
The high frequency oscillation cone of device and ammonia atomization hole are entered in the flue through the supersonic generator installing hole, the flange
Gask-O-Seal is provided between disk and the side wall of the flue, the supersonic generator passes through screw with the flue
By the technological means that the fixing hole on the ring flange is fixedly connected with the threaded securing bores of flue side wall, so,
Install, change and safeguard that supersonic generator is very convenient.When shape is shunk radially inward in the front portion for employing the columnar body
Form shoulder into cylinder and with the rear portion of the columnar body, the side wall of the cylinder is provided with screw thread, correspondingly, it is described enter
The side wall of flue is distributed with supersonic generator threaded mounting hole, the high frequency oscillation cone of the supersonic generator and ammonia atomization
Hole is entered in the flue through the supersonic generator threaded mounting hole, the side wall of the shoulder and the flue it
Between be provided with Gask-O-Seal, the supersonic generator is threadably secured the technological means being connected with the flue, then
Install, change and safeguard that supersonic generator is convenient.
Further improve as present embodiment, as shown in figure 4, the circular in cross-section of the flue 1, described super
Sonic generator 3 has multiple；Multiple supersonic generators 3 along the same cross section of the flue 1 it is circumferential equably
Distribution, the axle center of the high frequency oscillation cone 3-3 towards the flue 1 of the supersonic generator 3.It is of course also possible to be such as Fig. 5
It is shown, 1 point of multiple supersonic generators be it is multigroup, multigroup supersonic generator 1 respectively along the flue 1 not
With the circumferentially distributed of cross section, the axle center of the high frequency oscillation cone 3-3 towards the flue 1 of the supersonic generator 3.
As a result of the circular in cross-section of the flue, the supersonic generator has multiple to present embodiment；
Multiple supersonic generators are evenly distributed along the circumference of the same cross section of the flue, the supersonic generator
High frequency oscillation bore towards the flue axle center technological means, so, ammonia can be made equably to mix with flue gas.When adopting
It is divided into multiple supersonic generators multigroup, multigroup supersonic generator is different horizontal respectively along the flue
Section it is circumferentially distributed, the high frequency oscillation of the supersonic generator bores the technological means in the axle center towards the flue, then
Ammonia can be made further to be sufficiently mixed with flue gas.
Further improve, as shown in figures 1 to 6, the supersonic generator 6 and the ammonia as present embodiment
Many exchange devices 6 are provided between water pump 4, many exchange devices 6 have an ammonia import 6-1 and multiple ammonia outlet 6-2, described
One ammonia import 6-1 is connected with the plurality of ammonia outlet 6-2, and the plurality of ammonia outlet 6-2 is each configured with valve
The ammonia outlet of 6-3, one ammonia import 6-1 and the aqua ammonia pump 4, the plurality of ammonia outlet 6-2 respectively with
The ammonia inlet communication of the supersonic generator 3.
Present embodiment is as a result of being provided with many exchange devices, institute between the supersonic generator and the aqua ammonia pump
Stating many exchange devices has an ammonia import and the outlet of multiple ammonia, and one ammonia import is connected with the outlet of the plurality of ammonia
Logical, the plurality of ammonia outlet is each configured with valve, the ammonia outlet of one ammonia import and the aqua ammonia pump,
The outlet of the plurality of ammonia respectively with the technological means of the ammonia inlet communication of the supersonic generator, so, can be according to reality
Border situation is implemented to control to supersonic generator.
Further improve as present embodiment, as shown in figure 1, the smoke inlet and bag-type dust of the flue 1
The outlet flue connection of device 7, the outlet flue of the selective catalytic reduction denitration device 2 is by air-introduced machine 8 and the smoke inlet of chimney 9
Connection, the outlet flue of the sack cleaner 7 is connected with the smoke inlet of the chimney 9 by bypass flue 10, the bypass cigarette
By-pass damper 11 is respectively arranged near its two ends on road 10, is serially connected between the supersonic generator 1 and the ammonia source 5
Effusion meter 12 and ammonia filter 13.From figure 1 it appears that the effusion meter 12 is arranged on the ammonia source 5 and aqua ammonia pump 4
Between；The ammonia filter 13 is arranged between the aqua ammonia pump 4 and many exchange devices 6.Certainly, the ammonia filter
13 can also be arranged between the ammonia source 5 and aqua ammonia pump 4, or even, can be with the ammonia of each supersonic generator 3
Import configuration ammonia filter 13（Referring to Fig. 2 and Fig. 3）.The selective catalytic reduction denitration device 2 includes steel construction container
2-1, is provided with gas approach guiding device 2-2, even gas distribution device 2-3, catalyst module layer and supporting construction in container 2-1
2-4, the spare level 2-5 for being placed with catalyst module, are provided with maintenance installing hole 2-6 and soot blower 2-7 on wall of a container（It is described
Gas approach guiding device 2-2, even gas distribution device 2-3, catalyst module layer and supporting construction 2-4, it is placed with catalyst module
Spare level 2-5, be provided with wall of a container maintenance installing hole 2-6 and soot blower 2-7 be prior art）, the catalyst
The size of module is 150mm × 150mm × 860mm, and according to smoke detecting board-like or corrugated plate dst, the group of catalyst module are chosen
It is V to divide2O5、MoO3、TiO2And trace element, the proportioning between each component is V2O5Account for 0.1%-3%（Percentage by weight）, MoO3Account for
0.1%-10%（Percentage by weight）, WO3Account for 0.1%-5%（Percentage by weight）,TiO2Account for 80%（Percentage by weight）, trace element
Account for 10%（Percentage by weight）, the frequency of the supersonic generator 3 is 15-55khz, the power of the supersonic generator 3
For 30-500W, the atomizing piece of the supersonic generator 3 is ceramic atomizing piece.
Present embodiment is connected as a result of the smoke inlet of the flue with the outlet flue of sack cleaner, the choosing
The technological means that the outlet flue of selecting property catalytic reduction denitration device is connected by air-introduced machine with the smoke inlet of chimney, so, denitration
Reaction can be carried out at a lower temperature, and exhaust gas volumn greatly reduces, and catalyst volume accordingly reduces, and reactor volume is also correspondingly
Reduce, abrasion of the flue gas to catalyst reduces, and the life-span of catalyst greatly prolongs, and the use cost of catalyst is substantially reduced.Again
Connected by bypass flue with the smoke inlet of the chimney as a result of the outlet flue of the sack cleaner, the bypass cigarette
The technological means of by-pass damper are respectively arranged with road near its two ends, so, it is urgent when catalyst change and maintenance etc. is run into
Situation can select to open by-pass damper, make flue gas be directly discharged into chimney.Due also to employing the supersonic generator and institute
State and effusion meter and ammonia filter are serially connected between ammonia source, so, not only can be conducive to controlling the flow of ammonia, and,
It is also prevented from supersonic generator to block.Tie including steel as a result of the selective catalytic reduction denitration device again
Structure container, is provided with gas approach guiding device, even gas distribution device, catalyst module layer and supporting construction, is placed with container
The spare level of catalyst module, is provided with the technological means of maintenance installing hole and soot blower on wall of a container, so, be conducive to
De- efficiency is improved, it is convenient that deashing and maintenance are implemented to selective catalytic reduction denitration device.More as a result of the catalyst
The size of module is 150mm × 150mm × 860mm, and according to smoke detecting board-like or corrugated plate dst, the group of catalyst module are chosen
It is V to divide2O5、MoO3、TiO2And trace element, the proportioning between each component is V2O5Account for 0.1%-3%（Percentage by weight）, MoO3Account for
0.1%-10%（Percentage by weight）, WO3Account for 0.1%-5%（Percentage by weight）,TiO2Account for 80%（Percentage by weight）, trace element
Account for 10%（Percentage by weight）Technological means, so, not only denitration reaction can be carried out at temperature 140-150 DEG C, make flue gas
Denitration efficiency greatly improve on the premise of, greatly improve the service life of catalyst, greatly reduce denitration cost, and,
To carry out denitration reaction at 145 DEG C of temperature the denitration efficiency of flue gas can be made to reach highest with the ratio of denitration cost, and it is full
The discharge standard of sufficient flue gas.Finally, due to the frequency for employing the supersonic generator is 15-55khz, the ultrasound wave
The power of generator is 30-500W, and the atomizing piece of the supersonic generator is the technological means of ceramic atomizing piece, so, can
Further improve denitration efficiency.
Claims (3)
1. a kind of selective-catalytic-reduction denitrified system, including flue and selective catalytic reduction denitration device, it is described enter cigarette
The outlet flue in road is connected with the smoke inlet of the selective catalytic reduction denitration device, it is characterised in that：The flue is arranged
The ammonia import for having supersonic generator, the supersonic generator is connected by aqua ammonia pump with ammonia source, and the ultrasound wave is sent out
The ammonia atomization hole position of raw device is in the flue；The circular in cross-section of the flue, the supersonic generator has
It is multiple；Multiple supersonic generators are evenly distributed along the circumference of the same cross section of the flue, the ultrasound wave
The high frequency oscillation of generator bores the axle center towards the flue；Or, multiple supersonic generators be divided into it is multigroup, it is multigroup
The supersonic generator circumferentially distributed, main body of the supersonic generator respectively along the flue varying cross-section
It is in the form of a column, the front center of the columnar body is provided with hollow long-neck, and the termination of hollow long-neck is provided with high frequency oscillation cone, described
The high frequency oscillation of supersonic generator bores the axle center towards the flue；
Many exchange devices are provided between the supersonic generator and the aqua ammonia pump, many exchange devices have an ammonia import
Export with multiple ammonia, one ammonia import is connected with the outlet of the plurality of ammonia, the plurality of ammonia outlet difference
Be configured with valve, the ammonia outlet of one ammonia import and the aqua ammonia pump, the plurality of ammonia outlet respectively with
The ammonia inlet communication of the supersonic generator.
2. selective-catalytic-reduction denitrified system according to claim 1, it is characterised in that：The ammonia atomization hole has many
Individual, multiple ammonia atomization holes are circumferentially evenly distributed on the side wall of hollow long-neck termination；The front end of the columnar body
Extend radially outward to form ring flange, it is circumferentially distributed on the ring flange to have fixing hole, correspondingly, the side of the flue
Wall is distributed with supersonic generator installing hole, and the circumferential distribution along the supersonic generator installing hole has threaded securing bores,
The supersonic generator high frequency oscillation cone and ammonia atomization hole through the supersonic generator installing hole into it is described enter
In flue, Gask-O-Seal, the supersonic generator and institute are provided between the side wall of the ring flange and the flue
State flue to be fixedly connected with the threaded securing bores of flue side wall by the fixing hole on the ring flange by screw；
Or, the front portion of the columnar body shrinks radially inward to form cylinder and form shoulder, institute with the rear portion of the columnar body
The side wall for stating cylinder is provided with screw thread, and correspondingly, the side wall of the flue is distributed with supersonic generator threaded mounting hole,
The high frequency oscillation cone of the supersonic generator and ammonia atomization hole enter institute through the supersonic generator threaded mounting hole
State in flue, be provided with Gask-O-Seal between the side wall of the shoulder and the flue, the supersonic generator with
The flue is threadably secured connection.
3. selective-catalytic-reduction denitrified system according to claim 1, it is characterised in that：The smoke inlet of the flue
Connect with the outlet flue of sack cleaner, the outlet flue of the selective catalytic reduction denitration device is by air-introduced machine and chimney
Smoke inlet is connected, and the outlet flue of the sack cleaner is connected with the smoke inlet of the chimney by bypass flue, the bypass
By-pass damper is respectively arranged near its two ends on flue, between the supersonic generator and the ammonia source flow is serially connected with
Meter and ammonia filter, the selective catalytic reduction denitration device includes steel construction container, and gas approach is provided with container
Guiding device, even gas distribution device, catalyst module layer and supporting construction, the spare level for being placed with catalyst module, wall of a container
On be provided with maintenance installing hole and soot blower, the size of the catalyst module is 150mm × 150mm × 860mm, according to cigarette
Dirt characteristic chooses board-like or corrugated plate dst, and the component of catalyst module is V2O5、MoO3、TiO2And trace element, between each component
Proportioning be V2O5Account for 0.1%-3%（Percentage by weight）, MoO3Account for 0.1%-10%（Percentage by weight）, WO3Account for 0.1%-5%（Weight
Percentage ratio）,TiO2Account for 80%（Percentage by weight）, trace element accounts for 10%（Percentage by weight）, the supersonic generator
Frequency is 15-55khz, and the power of the supersonic generator is 30-500W, and the atomizing piece of the supersonic generator is pottery
Porcelain atomizing piece.
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| CN106492634A (en) * | 2016-11-30 | 2017-03-15 | 南京右转信息科技有限公司 | A kind of flue gas desulfurization and denitrification system |
| CN106540543B (en) * | 2017-01-17 | 2022-12-02 | 启迪环境科技发展股份有限公司 | Multi-pass selective catalytic reduction denitration device |
| CN109107382A (en) * | 2018-09-06 | 2019-01-01 | 南京瑞宜恒环境科技有限公司 | A kind of coking flue-gas denitration process |
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| EP0257307B1 (en) * | 1986-07-25 | 1992-04-29 | Sakai Chemical Industry Co., Ltd., | A method for denitrizing nitrogen oxides contained in waste gas |
| DE19806266C1 (en) * | 1998-02-16 | 1999-08-26 | Siemens Ag | Exhaust gas purification catalyst and process |
| DE102009035940C5 (en) * | 2009-08-03 | 2017-04-20 | Cummins Ltd. | SCR exhaust treatment device |
| CN101890279B (en) * | 2010-03-10 | 2013-03-13 | 张作保 | High-efficiency ammonia-method denitration process and device thereof |
| CN103585885B (en) * | 2013-11-22 | 2015-11-25 | 北京建筑材料科学研究总院有限公司 | Low-temperature denitration catalyst module and cement kiln low-temperature selective catalytic reduction denitration system |
| CN203886401U (en) * | 2014-05-15 | 2014-10-22 | 北京洛卡环保技术有限公司 | Boiler flue gas denitration system adopting SCR process |
| CN204429101U (en) * | 2014-12-19 | 2015-07-01 | 北京建筑材料科学研究总院有限公司 | A kind of selective-catalytic-reduction denitrified system |
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