CN209406054U - Low temperature SCR denitration device - Google Patents
Low temperature SCR denitration device Download PDFInfo
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- CN209406054U CN209406054U CN201821688094.6U CN201821688094U CN209406054U CN 209406054 U CN209406054 U CN 209406054U CN 201821688094 U CN201821688094 U CN 201821688094U CN 209406054 U CN209406054 U CN 209406054U
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- ammonia
- scr denitration
- spray
- branch pipe
- low temperature
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Abstract
The utility model discloses a kind of low temperature SCR denitration devices, it is related to purifying the device field of exhaust gas, its key points of the technical solution are that, including SCR denitration device and the end to end heat exchanger of SCR denitration device, it is connected with heat patching device and ammonia-gas spraying device on the pipeline path of the heat exchanger and SCR denitration device, ammonia-spraying grid is equipped in the ammonia-gas spraying device, the ammonia-spraying grid includes several spray ammonia branch pipes, it sprays and has several spray ammonia nozzles on ammonia branch pipe, the spray ammonia nozzle is rotatably coupled to spray ammonia branch pipe.It has the technical effect that, by changing injection direction of the spray ammonia nozzle in ammonia-gas spraying device, achieve the purpose that the gas ammonia flow for adjusting each branch pipe of ammonia-gas spraying device, to eliminate the excessive the escaping of ammonia region in part, improve entrance ammonia and spray uniformity, reduces the influence of the escaping of ammonia to greatest extent.
Description
Technical field
The utility model relates to purify the device field of exhaust gas, in particular to a kind of low temperature SCR denitration device.
Background technique
Existing gas denitrifying technology mainly has dry method (selective catalytic reduction flue gas denitration, selective non-catalytic reduction
Method denitration) and two kinds of wet process.Compared with wet flue gas denitration technology, the major advantage of dry method flue gas denitration technology is: basic to throw
Provide low, equipment and technical process are simple, and the efficiency for removing NOX is also higher, and no waste water and offal treatment do not easily cause secondary dirt
Dye.Under the conditions of selective catalytic reduction SCR method denitration is existing for the catalyst, using conducts such as ammonia, CO or hydrocarbons
NO in flue gas is reduced to N2 in the presence of oxygen by reducing agent.Can be used as SCR reaction reducing agent have NH3,
CO, H2, there are also methane, ethylene, propane, propylenes etc..The removal efficiency for the NO that can be obtained when using ammonia as also Primordial Qi is most
It is high.
The bending tubes end of SCR denitration system is equipped with spray ammonia system, and spray ammonia system includes ammonia gas supply system and air supply system
After system, ammonia gas supply system and air supply system are mixed by ammonia air mixer, mixed gas is filled into SCR and is taken off
At the bending tubes end of nitre system, it is equipped with ammonia-spraying grid in spray ammonia system, is mixed by ammonia-spraying grid with flue gas, it is latter wait be sufficiently mixed
And it is sent into SCR denitration system.Flue gas after heated and concurrent heating enters SCR denitration system, the ammonia sprayed into spray ammonia system
It is reacted under the effect of the catalyst, to reach denitration purpose.
Due in ammonia-spraying grid concentration field, couple between velocity field poor, lead to reactor outlet flue NH3/NOx points
Cloth is extremely uneven, and NOx has biggish deviation, and NH3 escapement ratio is high, and system spray ammonia is uneven, affects downstream SCR denitration system
Work.
Utility model content
The purpose of the utility model is to provide a kind of low temperature SCR denitration device, has and eliminate the excessive the escaping of ammonia in part
Region improves entrance ammonia and sprays uniformity, reduces the influence advantage of the escaping of ammonia to greatest extent.
The above-mentioned technical purpose of the utility model has the technical scheme that
A kind of low temperature SCR denitration device, including SCR denitration device and the end to end heat exchanger of SCR denitration device, institute
It states and is connected with heat patching device and ammonia-gas spraying device on heat exchanger and the pipeline path of SCR denitration device, be equipped in the ammonia-gas spraying device
Ammonia-spraying grid, the ammonia-spraying grid includes several spray ammonia branch pipes, sprays and has several spray ammonia nozzles, the spray ammonia on ammonia branch pipe
Nozzle is rotatably coupled to spray ammonia branch pipe.
By using above-mentioned technical proposal, after the flue gas of the flue entrance in ammonia-gas spraying device flows into, two in ammonia-gas spraying device
The velocity flow profile of the spray ammonia nozzle injection of side is uniform, takes at two in longitudinal direction, wherein flue gas flow rate deviation in side is respectively
0.4,0.8,0.5m s-1, relative deviation are respectively 2.8,7.1,6.0%；In the other side outside absolute deviation be 1.3,0.6,
0.6m s-1, relative deviation are respectively 9.4%, 5.7%, 7.2%.After the flow velocity for controlling spray ammonia nozzle injection, so that ammonia-gas spraying device
The NOx concentration distribution of inner flue different location is more uniform.
Further setting: the spray ammonia branch pipe is equipped with the spherical bearing with spheric region, sprays and has one on ammonia nozzle
Globe joint, the ball of globe joint is at least part of to be supported in the spheric region of spherical bearing, and globe joint is in spheric region
It interior part can free full angle rotation.
It by using above-mentioned technical proposal, is rotated by full angle, enables to spray ammonia nozzle in injection, providing can
The condition of multi-angle injection, facilitates adjusting to optimize.
Further setting: it is threadedly coupled between the spherical bearing and spray ammonia branch pipe.
By using above-mentioned technical proposal, spherical bearing can be connected through a screw thread the length for adjusting opposite spray ammonia branch pipe,
The length of spray ammonia nozzle is in different location, and position of the convenient free adjustment in ammonia-gas spraying device is optimized and revised more convenient.
Further setting: the spray ammonia branch pipe free end is equipped with isocon vertical to itself, and spherical bearing is mounted on
On isocon.
By using above-mentioned technical proposal, the setting of isocon changes injection side of the spray ammonia nozzle in ammonia-gas spraying device
To, it can be by the different location in gas injection to ammonia-gas spraying device, distribution is more uniform.
Further setting: the isocon is evenly arranged on the circumferencial direction of spray ammonia branch pipe.
By using above-mentioned technical proposal, so that regional area ammonia spraying amount is greatly reduced, the abnormal high point of the escaping of ammonia is eliminated, system
It is more uniform to spray ammonia, to drive declining to a great extent for whole system the escaping of ammonia rate.
Further setting: the ammonia-gas spraying device includes ammonia feeding mechanism and air supply device, in air supply device
It further include ammonia dilution air, the ammonia dilution wind heater of pipeline connection.
By using above-mentioned technical proposal, blasts after ammonia is diluted to certain proportion by a large amount of natural airs and spray into, prevent
Ammonia, which mixes with air, reaches explosion ratio, to avoid danger.
Nitrogen purging device is had in the ammonia gas supply system.
By using above-mentioned technical proposal, guarantees the cleaning of pipeline and prevent blocking pipeline.
In conclusion the utility model has the following beneficial effects: by changing spray of the spray ammonia nozzle in ammonia-gas spraying device
Direction is penetrated, achievees the purpose that the gas ammonia flow for adjusting each branch pipe of ammonia spraying system, so that the excessive the escaping of ammonia region in part is eliminated,
Improve entrance ammonia and spray uniformity, reduces the influence of the escaping of ammonia to greatest extent.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the low temperature SCR denitration device under the first preferred embodiment；
Fig. 2 is a kind of structural schematic diagram of ammonia-spraying grid；
Fig. 3 is another structural schematic diagram of ammonia-spraying grid；
Fig. 4 is the structural schematic diagram for spraying ammonia nozzle.
In figure, 1, SCR denitration device；2, heat patching device；3, ammonia-gas spraying device；4, flue combustor；5, ammonia-spraying grid；6, it changes
Thermal；7, ammonia branch pipe is sprayed；8, ammonia nozzle is sprayed；9, isocon；10, spherical bearing；11, globe joint；12, spheric region；13,
Screw thread；14, ammonia feeding mechanism；15, air supply device；16, ammonia dilution air；17, ammonia dilutes wind heater；18, ammonia
Air mixer；19, nitrogen purging device；21, combustion-supporting wind apparatus；22, coal gas feedway；23, liquefy air feed system or
Natural air feed system.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
The first preferred embodiment:
A kind of low temperature SCR denitration device, as shown in Figure 1, including SCR denitration device 1, end to end with SCR denitration device 1
Heat-exchanger rig 6, be connected with heat patching device 2 and ammonia-gas spraying device 3 on the pipeline path of heat-exchanger rig 6 and SCR denitration device 1.
Flue combustor 4 is equipped between the outlet of heat-exchanger rig 6 and the entrance of SCR denitration device 1, heat patching device 2 connects
To flue combustor 4,2 pipeline of heat patching device connects coal gas feedway 22 and liquefaction air feed system or natural gas supply dress
23 are set, coal gas feedway 22 and liquefaction air feed system or natural air feed system 23 are controlled by control valve to be opened and closed, and
The combustion-supporting wind apparatus 21 for filling into air is connected in heat patching device 2.Heat patching device 2 uses direct combustion system, and coal gas is direct
It burns in flue, this mode flue gas is fast, and flue-gas temperature is relatively uniform.
Heat-exchanger rig 6 uses plate heat exchanger heat supply.Plate heat exchanger is by a series of gold with certain corrugated shape
Belong to a kind of high-performance heat exchanger made of piece closed assembly, flue gas is after baffle heater heats, and flue-gas temperature is increased to 220 DEG C, heating
Denitration original flue gas afterwards is heated to 250 DEG C through flue gas heat supplementing device 2, operating temperature needed for meeting low temperature SCR denitration device
Condition.
Ammonia-gas spraying device 3 is located at the bending tubes end of SCR denitration device 1, and ammonia-gas spraying device 3 includes that ammonia feeding mechanism 14 and air supply
Device 15 is answered, further includes ammonia dilution air 16, ammonia dilution wind heater 17 in air supply device 15；14 He of ammonia feeding mechanism
After air supply device 15 is mixed by ammonia air mixer 18, by mixed gas fill into SCR denitration device 1 into cigarette
At end, it is equipped with ammonia-spraying grid 5 in ammonia-gas spraying device 3, is mixed by ammonia-spraying grid 5 with flue gas, is sent into SCR together after being sufficiently mixed
Denitrification apparatus 1.Flue gas after heated and concurrent heating enters SCR denitration device 1, and the ammonia sprayed into ammonia-gas spraying device 3 is being catalyzed
It is reacted under the action of agent, to reach denitration purpose.
Nitrogen purging device 19 is had in ammonia feeding mechanism 14.Guarantee the cleaning of pipeline and prevents blocking pipeline.
It should be noted that the catalyst used in SCR denitration device 1 is wide warm catalyst under present embodiment.It urges
Agent has wider Process window, temperature applicable range is 250~420 DEG C, while this catalyst using wide warm catalyst
With stronger resistance to SO_2 and lower decay of activity, reduces the generation of ABS and prolong the service life.
As shown in Fig. 2, ammonia-spraying grid 5 includes several spray ammonia branch pipes 7, sprays and have several spray ammonia nozzles on ammonia branch pipe 7
8, spray ammonia nozzle 8 is rotatably coupled on spray ammonia branch pipe 7.
As shown in figure 3, spray 7 free end of ammonia branch pipe is equipped with isocon 9 vertical to itself, isocon 9 is evenly arranged in
On the circumferencial direction for spraying ammonia branch pipe 7.Spray ammonia nozzle 8 also may be mounted on isocon 9.
Spray ammonia nozzle 8 can be set in spray ammonia branch pipe 7 and combined setting is on isocon 9.
As shown in figure 4, spray ammonia branch pipe 7 is equipped with the spherical bearing 10 with spheric region 12, sprays and have one on ammonia nozzle 8
Globe joint 11, in at least part of spheric region 12 for being supported on spherical bearing 10 of the ball of globe joint 11, globe joint 11
It can free full angle rotation in the part in spheric region 12.It sprays and connects between ammonia nozzle 8 and spray ammonia branch pipe 7 for a flexural pivot
It connects, the globe joint 11 of fixed point of the spherical bearing 10 as bearing, spray ammonia nozzle 8 rotates with it, under the present embodiment, will
10 screw thread 13 of spherical bearing is connected on spray ammonia branch pipe 7, when necessary, the angle of adjustable spray ammonia nozzle 8, and adjustment spray ammonia
Nozzle 8 is in position spatially.
By adjust each region of ammonia-spraying grid 5 spray ammonia angle, to greatest extent improve ammonia-gas spraying device 3 in NOx distribution it is equal
Even property.Improve entrance ammonia and spray uniformity, the influence of the escaping of ammonia can be reduced to greatest extent.Also, reduce catalyst dust stratification,
Phenomena such as blocking.
Second of preferred embodiment:
A kind of low temperature SCR denitration system, including SCR denitration device and the end to end heat exchanger of SCR denitration device, heat exchanger
With heat patching device 2 and ammonia-gas spraying device 3, the outlet of heat exchanger and entering for SCR denitration device are connected on the pipeline path of SCR denitration device
Flue combustor 4 is equipped between mouthful, heat patching device 2 is connected in flue combustor 4, heat exchanger plate heat exchanger heat supply.Spray
The ammonia-spraying grid 5 of the first preferred embodiment is had in ammonia device 3.
The catalyst used in low temperature SCR denitration system is wide warm catalyst.
The third preferred embodiment:
A kind of low temperature SCR denitration method, including SCR denitration device and the end to end heat exchanger of SCR denitration device, heat exchanger
Heat patching device 2 and ammonia-gas spraying device 3 are connected with on the pipeline path of SCR denitration device: in outlet and the SCR denitration device of heat exchanger
Flue combustor 4 is set between entrance, heat patching device is connected directly in flue combustor 4, the heat exchange used in this method
Device is plate heat exchanger.It is optimized in ammonia-gas spraying device 3 using ammonia-spraying grid 5 disclosed in the first preferred embodiment.
The catalyst converter used in low temperature SCR denitration method is wide warm catalyst.
The above embodiments are only explanation of the invention, are not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (7)
1. a kind of low temperature SCR denitration device, including SCR denitration device (1) and SCR denitration device (1) end to end heat exchange
Heat patching device (2) and ammonia-gas spraying device (3) are connected on the pipeline path of device, the heat exchanger and SCR denitration device (1), it is described
Ammonia-spraying grid (5) are equipped in ammonia-gas spraying device (3), the ammonia-spraying grid (5) includes several sprays ammonia branch pipe (7), sprays ammonia branch pipe
(7) several spray ammonia nozzles (8) are had on, it is characterised in that: the spray ammonia nozzle (8) is rotatably coupled to spray ammonia branch pipe (7).
2. low temperature SCR denitration device according to claim 1, it is characterised in that: the spray ammonia branch pipe (7) is equipped with and has
The spherical bearing (10) of spheric region (12) sprays and has a globe joint (11) on ammonia nozzle (8), and the ball of globe joint (11) is extremely
In the least a portion of spheric region (12) for being supported on spherical bearing (10), globe joint (11) is in the part in spheric region (12)
It can free full angle rotation.
3. low temperature SCR denitration device according to claim 2, it is characterised in that: the spherical bearing (10) and spray ammonia branch
Manage screw thread (13) connection between (7).
4. low temperature SCR denitration device according to claim 2, it is characterised in that: set on spray ammonia branch pipe (7) free end
Have isocon vertical to itself (9), spherical bearing (10) is mounted on isocon (9).
5. low temperature SCR denitration device according to claim 4, it is characterised in that: the isocon (9) is evenly arranged in spray
On the circumferencial direction of ammonia branch pipe (7).
6. low temperature SCR denitration device according to claim 1, it is characterised in that: the ammonia-gas spraying device (3) includes that ammonia supplies
Device (14) and air supply device (15) are answered, further includes the ammonia dilution air of pipeline connection in air supply device (15)
(16), ammonia dilution wind heater (17).
7. low temperature SCR denitration device according to claim 6, it is characterised in that: band in the ammonia feeding mechanism (14)
There are nitrogen purging device (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821688094.6U CN209406054U (en) | 2018-10-17 | 2018-10-17 | Low temperature SCR denitration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821688094.6U CN209406054U (en) | 2018-10-17 | 2018-10-17 | Low temperature SCR denitration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209406054U true CN209406054U (en) | 2019-09-20 |
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ID=67931598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821688094.6U Active CN209406054U (en) | 2018-10-17 | 2018-10-17 | Low temperature SCR denitration device |
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| Country | Link |
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| CN (1) | CN209406054U (en) |
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2018
- 2018-10-17 CN CN201821688094.6U patent/CN209406054U/en active Active
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