CN109173714A - Low temperature SCR denitration system, device, method - Google Patents
Low temperature SCR denitration system, device, method Download PDFInfo
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- CN109173714A CN109173714A CN201811210313.4A CN201811210313A CN109173714A CN 109173714 A CN109173714 A CN 109173714A CN 201811210313 A CN201811210313 A CN 201811210313A CN 109173714 A CN109173714 A CN 109173714A
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- scr denitration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- Environmental & Geological Engineering (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention discloses a kind of low temperature SCR denitration systems, device, method, it is related to purifying the apparatus and system field of exhaust gas, its key points of the technical solution are that, including SCR denitration system and the end to end heat-exchange system of SCR denitration system, concurrent heating system and spray ammonia system are connected on the heat-exchange system and the pipeline path of SCR denitration system, flue combustor is equipped between the outlet of the heat-exchange system and the entrance of SCR denitration system, the concurrent heating system is connected in flue combustor, and the heat-exchange system uses plate heat exchanger heat supply.It is improved by the present invention, which has the advantages that 1, flue gas No leakage, reduce the dosage of catalyst and ammonia, reduce operating cost.2, the heating of flue gas concurrent heating system is fast, and flue-gas temperature is relatively uniform.3, catalyst reaction window is wide, can easily be accommodated.
Description
Technical field
The present invention relates to purification exhaust gas apparatus and system field, in particular to a kind of low temperature SCR denitration system, device,
Method.
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.
Flue-gas temperature behind sintering machine of steel mill outlet or semi-dry desulphurization it is lower (generally 110~160 DEG C, according to half
Dry desulfurization flue-gas temperature is generally 80 DEG C or so), this temperature range is unsatisfactory for the temperature requirement of conventional scr denitrating catalyst
(middle low temperature catalyst temperature is generally 280 DEG C or more).So needing to carry out after being heated to 280 DEG C denitration inlet flue gas
Carry out denitration.
Conventional scheme generally heats former flue gas using rotary GGH, using high-temperature flue gas after denitration to former flue gas
It is heated, generally by former flue gas to 250 DEG C.Simultaneously as rotary GGH heat exchange difference requires and middle low temperature catalyst
Temperature requirement needs to be heated to 280 DEG C to former flue gas further progress；Then denitration is carried out by SCR reactor.Flue gas concurrent heating
System generally uses hot-blast stove, and combustion gas uses steel mill's blast furnace gas or coke-stove gas, coal gas burn in hot-blast stove generate 600~
700 DEG C of high-temperature flue gas, with rotary GGH outlet high temperature original flue gas mixed, after mixing temperature reach in it is low-temperature catalyzed
The temperature requirement of agent.
It is using the shortcomings that process above: 1, since rotary GGH sealing and former flue gas and neat stress side there are pressure difference,
Cause former fume side flue gas to leak to neat stress, causes DS NOx Est concentration in neat stress to increase, it is therefore desirable to mention denitration efficiency
Height prevents neat stress DS NOx Est concentration over-standard, increases the dosage of catalyst and ammonia.
2, flue gas concurrent heating system is heated up using hot-blast stove high-temperature flue gas and denitration original flue gas blending form, and there are flue gases
Mixing is uneven, flue-gas temperature heating low efficiency.
3, low temperature catalyst in denitrating catalyst use, catalyst temperature window limit consume energy higher at 280 DEG C or more.
Summary of the invention
The purpose of the present invention one is to provide a kind of low temperature SCR denitration system, energy consumption low, flue gas liter low with ammonia dosage
The high-efficient advantage of temperature.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of low temperature SCR denitration system, it is described including SCR denitration system and the end to end heat-exchange system of SCR denitration system
Concurrent heating system and spray ammonia system, the outlet of the heat-exchange system are connected on heat-exchange system and the pipeline path of SCR denitration system
Flue combustor is equipped between the entrance of SCR denitration system, the concurrent heating system is connected in flue combustor, the heat exchange
System uses plate heat exchanger heat supply.
By using above-mentioned technical proposal, plate heat exchanger is by a series of sheet metal closed assemblies with certain corrugated shape
Made of a kind of high-performance heat exchanger, flue gas is after baffle heater heats, and flue-gas temperature is increased to 220 DEG C, the denitration after heating
Former flue gas is heated to 250 DEG C through flue gas concurrent heating system.Concurrent heating system uses direct combustion system, and coal gas directly fires in flue
It burns, this mode flue gas is fast, and flue-gas temperature is relatively uniform.Plate heat exchanger has the advantages that No leakage, avoids former flue gas
With the pressure difference of neat stress, reduce the dosage of catalyst and ammonia.
Flue gas after heated and concurrent heating enters SCR reactor, work of the ammonia sprayed into spray ammonia system in catalyst
It is reacted under, to reach denitration purpose.
The high-temperature flue gas of plate heat exchanger comes from SCR denitration system, and the exit gas temperature of SCR denitration system is 250 DEG C.
Flue gas after denitration enters plate heat exchanger, exchanges heat with former flue gas, heats former flue gas, finally enters smoke stack emission, change
The thermal efficiency is high, heat loss is small, and heat recovery rate is high.
Further setting: the catalyst used in the low temperature SCR denitration system is wide warm catalyst.
By using above-mentioned technical proposal, catalyst has wider Process window using wide warm catalyst, and temperature is suitable
It is 250~420 DEG C with range, while this catalyst has stronger resistance to SO_2 and lower decay of activity, reduces the production of ABS
It gives birth to and prolongs the service life.
Further setting: the spray ammonia system is located at the bending tubes end of SCR denitration system, and spray ammonia lattice are equipped in spray ammonia system
Grid, the ammonia-spraying grid includes several spray ammonia branch pipes, sprays and has several spray ammonia nozzles on ammonia branch pipe, the spray ammonia nozzle can
Rotation is connected to spray ammonia branch pipe.
Two in ammonia system are sprayed after the flue gas inflow for spraying the flue entrance in ammonia system by using above-mentioned technical proposal
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 spray ammonia system
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 spray ammonia system 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, the isocon is evenly arranged on the circumferencial direction of spray ammonia branch pipe.
By using above-mentioned technical proposal, the setting of isocon changes injection side of the spray ammonia nozzle in spray ammonia system
To, it can be by the different location in gas injection to spray ammonia system, distribution is more uniform.So that regional area ammonia spraying amount is substantially
It reduces, the abnormal high point of the escaping of ammonia is eliminated, and system spray ammonia is more uniform, to drive declining to a great extent for whole system the escaping of ammonia rate.
The purpose of the present invention two is to provide a kind of low temperature SCR denitration device, energy consumption low, flue gas liter low with ammonia dosage
The high-efficient advantage of temperature.
Above-mentioned technical purpose of the invention 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, the heat exchanger
Be connected with heat patching device and ammonia-gas spraying device on the pipeline path of SCR denitration device, the outlet of the heat exchanger and SCR denitration device
Flue combustor is equipped between entrance, the heat patching device is connected in flue combustor, the heat exchanger plate heat exchanger
Heat supply.
Further setting: the catalyst used in the low temperature SCR denitration device is wide warm catalyst.
The purpose of the present invention three is to provide a kind of low temperature SCR denitration method, energy consumption low, flue gas liter low with ammonia dosage
The high-efficient advantage of temperature.
Above-mentioned technical purpose of the invention has the technical scheme that
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 and SCR
Be connected with heat patching device and ammonia-gas spraying device on the pipeline path of denitrator: heat exchanger outlet and SCR denitration device entrance it
Between flue combustor is set, heat patching device is connected directly in flue combustor, the heat exchanger used in this method is board-like
Heat exchanger.
Further setting: the catalyst converter used in the low temperature SCR denitration method is wide warm catalyst.
In conclusion the low temperature SCR denitration system has the invention has the following advantages: improving by the present invention
Following advantage:
1, flue gas No leakage reduces the dosage of catalyst and ammonia, reduces operating cost.
2, the heating of flue gas concurrent heating system is fast, and flue-gas temperature is relatively uniform.
3, catalyst reaction window is wide, can easily be accommodated.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the low temperature SCR denitration system 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 system；2, concurrent heating system；3, ammonia system is sprayed；4, flue combustor；5, ammonia-spraying grid；6, it changes
Hot systems；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 gas supply system；15, air supply system；16, ammonia dilution air；17, ammonia dilutes wind heater；18, ammonia
Air mixer；19, nitrogen purging device；21, combustion-supporting wind system；22, gas supply system；23, liquefied gas feed system or
Natural gas supply 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 system, as shown in Figure 1, include SCR denitration system 1, with SCR denitration system 1 is end to end changes
Concurrent heating system 2 and spray ammonia system 3 are connected on the pipeline path of hot systems 6, heat-exchange system 6 and SCR denitration system 1.
Flue combustor 4 is equipped between the outlet of heat-exchange system 6 and the entrance of SCR denitration system 1, concurrent heating system 2 connects
To flue combustor 4,2 pipeline of concurrent heating system connects gas supply system 22 and liquefied gas feed system or natural gas supply system
System 23, gas supply system 22 and liquefied gas feed system or natural gas supply system 23 are controlled by control valve to be opened and closed, and
The combustion-supporting wind system 21 for filling into air is connected in concurrent heating system 2.Concurrent heating system 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-exchange system 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 concurrent heating system 2, operating temperature needed for meeting low temperature SCR denitration system 1
Condition.
Spray ammonia system 3 is located at the bending tubes end of SCR denitration system 1, and spray ammonia system 3 includes that ammonia gas supply system 14 and air supply
System 15 is answered, further includes ammonia dilution air 16, ammonia dilution wind heater 17 in air supply system 15；14 He of ammonia gas supply system
After air supply system 15 is mixed by ammonia air mixer 18, by mixed gas fill into SCR denitration system 1 into cigarette
At end, it is equipped with ammonia-spraying grid 5 in spray ammonia system 3, is mixed by ammonia-spraying grid 5 with flue gas, is sent into SCR together after being sufficiently mixed
Denitrating system 1.Flue gas after heated and concurrent heating enters SCR denitration system 1, and the ammonia sprayed into spray ammonia system 3 is being catalyzed
It is reacted under the action of agent, to reach denitration purpose.
Nitrogen purging device 19 is had in ammonia gas supply system 14.Guarantee the cleaning of pipeline and prevents blocking pipeline.
It should be noted that the catalyst used in SCR denitration system 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 spray ammonia system 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 device, including SCR denitration device and the end to end heat exchanger of SCR denitration device, heat exchanger and SCR
Heat patching device and ammonia-gas spraying device are connected on the pipeline path of denitrator, between the outlet of heat exchanger and the entrance of SCR denitration device
Equipped with flue combustor 4, heat patching device is connected in flue combustor 4, heat exchanger plate heat exchanger heat supply.In ammonia-gas spraying device
Ammonia-spraying grid 5 with the first preferred embodiment.
The catalyst used in low temperature SCR denitration device 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 and SCR
Be connected with heat patching device and ammonia-gas spraying device on the pipeline path of denitrator: heat exchanger outlet and SCR denitration device entrance it
Between be arranged flue combustor 4, heat patching device is connected directly in flue combustor 4, the heat exchanger used in this method is plate
Formula heat exchanger.It is optimized in ammonia-gas spraying device 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 (10)
1. a kind of low temperature SCR denitration system, including SCR denitration system (1) and SCR denitration system (1) end to end heat exchange system
It unites (6), concurrent heating system (2) and spray ammonia system is connected on the pipeline path of the heat-exchange system (6) and SCR denitration system (1)
(3), it is characterised in that: flue combustor is equipped between the outlet of the heat-exchange system (6) and the entrance of SCR denitration system (1)
(4), the concurrent heating system (2) is connected in flue combustor (4), and the heat-exchange system (6) uses plate heat exchanger heat supply.
2. low temperature SCR denitration system according to claim 1, it is characterised in that: in the low temperature SCR denitration system (1)
The catalyst used is wide warm catalyst.
3. low temperature SCR denitration system according to claim 1, it is characterised in that: the spray ammonia system (3) is de- positioned at SCR
The bending tubes end of nitre system (1), spray ammonia system (3) is interior to be equipped with ammonia-spraying grid (5), and the ammonia-spraying grid (5) includes several sprays
Ammonia branch pipe (7) sprays and has several spray ammonia nozzles (8) on ammonia branch pipe (7), and the spray ammonia nozzle (8) is rotatably coupled to spray ammonia
Branch pipe (7).
4. low temperature SCR denitration system according to claim 3, 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.
5. low temperature SCR denitration system according to claim 4, it is characterised in that: the spherical bearing (10) and spray ammonia branch
Manage screw thread (13) connection between (7).
6. low temperature SCR denitration system according to claim 5, 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), and the isocon (9) is evenly arranged in
On the circumferencial direction for spraying ammonia branch pipe (7).
7. a kind of low temperature SCR denitration device, including SCR denitration device and the end to end heat exchanger of SCR denitration device, the heat exchange
Heat patching device and ammonia-gas spraying device are connected on the pipeline path of device and SCR denitration device, it is characterised in that: the outlet of the heat exchanger
Flue combustor (4) are equipped between the entrance of SCR denitration device, the heat patching device is connected in flue combustor (4), described
Heat exchanger plate heat exchanger heat supply.
8. low temperature SCR denitration device according to claim 7, it is characterised in that: used in the low temperature SCR denitration device
Catalyst be wide warm catalyst.
9. a kind of low temperature SCR denitration method, including SCR denitration device, with the end to end heat exchanger of SCR denitration device, heat exchanger and
Heat patching device and ammonia-gas spraying device are connected on the pipeline path of SCR denitration device, it is characterised in that: outlet and SCR in heat exchanger
Flue combustor (4) are set between the entrance of denitrator, heat patching device are connected directly in flue combustor (4), this method
The middle heat exchanger used is plate heat exchanger.
10. low temperature SCR denitration method according to claim 9, it is characterised in that: adopted in the low temperature SCR denitration method
Catalyst converter is wide warm catalyst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811210313.4A CN109173714A (en) | 2018-10-17 | 2018-10-17 | Low temperature SCR denitration system, device, method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811210313.4A CN109173714A (en) | 2018-10-17 | 2018-10-17 | Low temperature SCR denitration system, device, method |
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| CN109173714A true CN109173714A (en) | 2019-01-11 |
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ID=64945280
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811210313.4A Pending CN109173714A (en) | 2018-10-17 | 2018-10-17 | Low temperature SCR denitration system, device, method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112169589A (en) * | 2020-10-30 | 2021-01-05 | 山东信能达工程科技有限公司 | Ultralow-temperature flue gas SCR denitration system and technology |
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| CN207709499U (en) * | 2017-12-12 | 2018-08-10 | 河南栗子园食品饮料有限公司 | A kind of bottleneck Flushing nozzle and bottleneck irrigator stand |
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|---|---|---|---|---|
| CN201692914U (en) * | 2010-03-26 | 2011-01-05 | 中色科技股份有限公司 | Universal adjustable nozzle |
| CN204799107U (en) * | 2015-07-06 | 2015-11-25 | 北京峰业电力环保工程有限公司 | A ammonia injection grid for industry flue gas selective catalytic reduction denitrification facility |
| CN205535792U (en) * | 2016-02-23 | 2016-08-31 | 山东成泰化工有限公司 | Fuel gas heating furnace is with burning nozzles |
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| CN112169589A (en) * | 2020-10-30 | 2021-01-05 | 山东信能达工程科技有限公司 | Ultralow-temperature flue gas SCR denitration system and technology |
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Application publication date: 20190111 |