CN209501369U - A kind of flue gas SCR denitration device with mixed fume and dust effect - Google Patents
A kind of flue gas SCR denitration device with mixed fume and dust effect Download PDFInfo
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- CN209501369U CN209501369U CN201822273588.4U CN201822273588U CN209501369U CN 209501369 U CN209501369 U CN 209501369U CN 201822273588 U CN201822273588 U CN 201822273588U CN 209501369 U CN209501369 U CN 209501369U
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Abstract
The utility model discloses a kind of flue gas SCR denitration device with mixed fume and dust effect, ammonia-gas spraying device, mixer, pre- dedusting smoke pipe, catalyst are sequentially arranged in the device, and the flue gas come out from economizer first sprays ammonia (NH through ammonia-gas spraying device3), velocity of flue gas field is relatively uniform under this state, be conducive to the uniform diffusion of ammonia, on the one hand longer path, which can be flowed through, just reaches SCR denitration reaction device, be conducive to ammonia to mix with the uniform of flue gas, improve the denitration efficiency of device, when on the other hand the flue gas containing ammonia passes through mixer, mixer, which further functions as, to be reduced flue gas internal difference in temperature and strengthens the mixed effect of both ammonia-flue gases, and subsequent flue gas flows into after pre- dedusting smoke pipe is dusted and flows into SCR denitration reaction device again.It was verified that above-mentioned arrangement can create highly uniform flow field condition in the utility model for SCR denitration reaction device, and the exhaust gas dust concentration entered in reactor is lower, and the temperature difference is small, is conducive to the efficiency for improving SCR denitration reaction.
Description
Technical field
The utility model relates to fume treatment technical field, in particular to a kind of flue gas SCR with mixed fume and dust effect
Denitrification apparatus.
Background technique
Selective catalytic reduction (SCR) denitration technology is in the world using gas denitrifying technology the most mature, with dress
The advantages that setting simple structure, good reliability, high denitration efficiency occupies the denitrating flue gas market in the world 80%.SCR denitration mechanism
It is by reducing agent NH3It sprays into flue gas, after a degree of mixing, NH3It is aoxidized under the effect of the catalyst with NOx
Reduction reaction makes NOx be reduced to harmless N2。
The denitration performance of SCR denitration technology is influenced by factors, wherein Flow Field Distribution be most important technical requirements it
One." JB-T 13175-2017 coal-fired flue gas denitration numerical value and physical simulation experiment method " is to the stream at first floor catalyst inlet
Make following technical requirements in field: 1. flue gas flow rate deviation is not more than 15%；2. flue gas flow direction deviation is not more than 10 °；3. concentration is inclined
Difference is not more than 5%；4. flue-gas temperature deviation is no more than ± 15 DEG C.
The typical structure of the SCR denitration system of the prior art such as Fig. 1 mainly includes economizer 1, catalyst 7 and air
Preheater 8；Pre- dedusting is carried out in 1 arranged beneath ash bucket 2 of economizer, arranges water conservancy diversion measure (water conservancy diversion at flue turning and variable diameter
Plate 3, rectifier 6 etc.) flow fieldoptimization is carried out, strengthen ammonia-flue gas mixed effect in 4 arranged downstream mixer 5 of ammonia-gas spraying device, most
Flow field is made to reach associated specifications eventually.In addition, also taking scene spray ammonia adjusting and optimizing test in the prior art to engineering
Concentration field in actual moving process optimizes, to control amount of ammonia slip.
Although can satisfy corresponding technical requirements in numerical value and physical simulation experiment, in SCR denitration system
In longtime running, there is following FAQs:
The first, the first floor catalyst inlet flue gas temperature difference is larger, and some engineering project absolute temperature differences can reach 30 DEG C or more；
The second, catalyst blockage and serious wear；
Third, air preheater corrosion and blocking are serious, cause bigger to gas-flow resistance.
Therefore, above-mentioned one of them or several defects are solved, is those skilled in that art's urgent issue.
Utility model content
The utility model provides a kind of flue gas SCR denitration device with mixed fume and dust effect, is located at economizer and air
Smoke pipe between preheater, the flue gas SCR denitration device includes with lower component: ammonia-gas spraying device, mixer, pre-dedusting device and dress
There is the SCR denitration reaction device of catalyst, wherein the ammonia-gas spraying device is set to the outlet conduit of the economizer, described pre- to remove
Dirt device includes the pre- dedusting smoke pipe at least one turning section, and the pre- dedusting smoke pipe is located at the outlet of the economizer
Road downstream, the mixer are set to pre- dedusting smoke pipe upstream smoke pipe, and the SCR denitration reaction device is connected to described pre- remove
The downstream smoke pipe of cloud of dust pipe
Ammonia-gas spraying device, mixer, pre- dedusting smoke pipe in the utility model are sequentially arranged, and the flue gas come out from economizer is first
Ammonia is sprayed through ammonia-gas spraying device, flue gas pressures are bigger under this state, are conducive to the diffusion of ammonia, and can flow through longer path
SCR denitration reaction device is reached, is conducive to ammonia and is uniformly mixed in inside flue gas, improve subsequent denitration efficiency, and spray the cigarette of ammonia
Gas is mixed through mixer, and mixer, which further functions as, to be reduced flue gas internal difference in temperature and strengthen the mixed effect of both ammonia-flue gases, with
Flue gas flows into after pre- dedusting smoke pipe is dusted and flows into SCR denitration reaction device again afterwards, in practice it has proved that, above-mentioned cloth in the utility model
The mode of setting can create highly uniform flow field condition for SCR denitration reaction device, and enter the flue-gas temperature in reactor compared with
Equilibrium, the temperature difference is small, is conducive to the efficiency for improving SCR denitration reaction.
Optionally, the outlet conduit of the economizer includes taper necking pipe, along airflow direction, the taper necking pipe
Bore is tapered, and the ammonia-gas spraying device is installed on the import of the taper pipeline section or the taper necking pipe of the taper necking pipe
Position, the mixer are located at the outlet port of the taper necking pipe, and between the ammonia-gas spraying device and the mixer
With preset distance.
Optionally, the pre-dedusting device further includes the ash bucket for being connected to the pre- dedusting smoke pipe, the pre- dedusting smoke pipe
Including at least two section straight pipes, the turning section is formed between each straight pipe.
Optionally, the quantity of the straight pipe be three sections, three section straight pipes be sequentially connected be located at two sides first pipe,
Second pipe forms U-shaped structure；
Alternatively, the quantity of the straight pipe is two sections, two section straight pipes are connected to form V-structure.
Optionally, the pipeline section bottom wall in the pre- dedusting smoke pipe in extreme lower position has step surface, the step surface court
Upstream flue gas, the ash bucket are formed in the pipeline section bottom wall of the extreme lower position, and the ash bucket is located at the step surface upstream position
It sets and close to the step surface.
Optionally, further include rectifier, at least two layers of catalyst, the rectification are disposed in the SCR denitration reaction device
Device is arranged in the surface of each layer catalyst, and the air preheater is arranged in the necking down pipe outlet of the SCR denitration reaction device
Underface；Diversion component is installed inside connecting pipe between the pre- dedusting smoke pipe and the SCR denitration reaction device.
Optionally, the mixer includes several mixed plates, and the smoke pipe of the mixer installation site is rectangular tube, described
Mixed plate is installed on the short side wall of the rectangular tube, and each short side wall is disposed at least one mixed plate along longitudinal direction, same
Two adjacent mixed plates interlaced arrangement in the width direction on short side wall；And one end of the mixed plate and the short side wall are in pre-
Determine angle to fix, the other end extends to the smoke pipe middle part.
Optionally, the mixed plate includes plate body and the extension that extends internally from the plate body, the width of the extension
Degree is equal to the plate body width；
Alternatively, the mixed plate includes plate body and the extension that extends internally from the plate body, the width of the extension
Less than the plate body width, the quantity of the extension is one or two or multiple, all in the width direction described to prolong
Extending portion arranged for interval.
Optionally, on same cross section, the extension of all mixed plates of opposite two the first side walls is arranged in also along width
Direction interlaced arrangement.
Optionally, the extension is straight panel or arc panel.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of flue gas SCR denitration device in the prior art；
Fig. 2 is that there is the structure of the flue gas SCR denitration device of mixed fume and dust effect to show in a kind of embodiment of the utility model
It is intended to；
Fig. 3 is partial enlargement diagram in Fig. 2；
Fig. 4 a is the partial structural diagram of mixer in the first specific embodiment of the utility model；
Fig. 4 b is the partial structural diagram of mixer in second of specific embodiment of the utility model；
Fig. 4 c is the partial structural diagram of mixer in the third specific embodiment of the utility model；
Fig. 4 d is the partial structural diagram of mixer in the 4th kind of specific embodiment of the utility model；
Fig. 5 is Fig. 4 a transverse sectional view；
Fig. 6 is the flue-gas temperature distribution schematic diagram of economizer in a kind of specific embodiment of the utility model；
Fig. 7 is three in a kind of specific embodiment of the utility model with the flue gas SCR denitration device for mixing fume and dust effect
Tie up schematic diagram.
Wherein, in Fig. 1:
1- economizer；2- ash bucket；3- deflector；4- ammonia-gas spraying device；5- mixer；6- rectifier；7- catalyst；8- air
Preheater；
Wherein, Fig. 2 is into Fig. 5, Fig. 7:
11- economizer；12- ammonia-gas spraying device；13- mixer；131- mixed plate；1311- plate body；1312- extension；14-
Ash bucket；15 diversion components；16-- rectifier；17- catalyst；18- air preheater；19- taper necking pipe；10- removes the cloud of dust in advance
Pipe；101- first pipe；102- second pipe；The first straight pipeline of 103-；The second straight pipeline of 104-；105- third straight pipeline；1a-
Smoke pipe, 1a1- short side wall.
Specific embodiment
It for the above-mentioned technical problems in the prior art, is furtherd investigate herein, discovery causes the above problem
The main reason for be since engineering actual motion condition is more than simulation test complicated condition.Lead to first floor catalyst inlet flue gas
The main reason for temperature difference is big is the heat exchange unevenness due to economizer, and the flue-gas temperature of economizer exit is caused to be unevenly distributed, and
Simulation test condition assumes that economizer exit uniformity of temperature profile, does not consider actual conditions and takes corresponding Optimized Measures.
The main reason for leading to catalyst blockage, is: since SCR denitration reaction device is arranged in economizer to air preheater
Between, belong to high-temperature high dust section, and the pre- efficiency of dust collection of ash bucket below economizer is low, pre- efficiency of dust collection is generally on 10% left side
The right side, catalyst work under high dirt environment for a long time, and the blockage and wear for catalyst occur are unavoidable.
Causing air preheater to corrode and block the main reason for serious problems generate is: since the concentration of the prior art is inclined
Difference still has certain the escaping of ammonia risk generally between 3%~5%, and escape ammonia and sulfur trioxide, water reaction generate sulfuric acid
Hydrogen ammonia, hydrogen sulfate ammonia liquefy in the low-temperature zone of air preheater, are adhered on heat exchange element and cause to corrode and block.
For the prior art occur the flue gas temperature difference is big, pre- efficiency of dust collection is low and ammonia-flue gas mixing uniformity is limited asks
Topic, the application motion propose a kind of flue gas SCR denitration device of stability and high efficiency, it, which has, adjusts flue-gas temperature, reduces the temperature difference
Effect, can be significantly increased and pre- efficiency of dust collection and further increase uniform concentration distribution, so that flue gas SCR is de-
Nitre system is steady in a long-term, efficiently runs.
In order to make those skilled in the art more fully understand the technical solution of the utility model, with reference to the accompanying drawing and have
The utility model is described in further detail for body embodiment.
Fig. 2 to Fig. 7 is please referred to, the utility model provides a kind of flue gas SCR denitration device with mixed fume and dust effect,
The smoke pipe between economizer 11 and air preheater, flue gas SCR denitration device include ammonia-gas spraying device 12, mixer 13, remove in advance
Dirt device and SCR denitration reaction device equipped with catalyst 17.
Wherein economizer 11 is installed on boiler tail smoke pipe lower part for recycling discharged fume waste heat, that is, utilizes high-temperature flue gas
The further heating boiler feed water of heat, play the role of the exhaust gas temperature for reducing flue gas.The specific structure of economizer 11 is non-
This paper inventive point can refer to the prior art, not be described in detail herein.
The main function of mixer 13 is the effect for adjusting the flue gas temperature difference and mixing ammonia-flue gas effect.
The effect of pre-dedusting device is the most of dust removed in flue gas in advance.
There is catalyst 17 in SCR denitration reaction device, catalyst 17 mainly utilizes selective catalytic reduction (SCR) principle
To the substance that NOx is handled, under the effect of the catalyst, the NO in reducing agent ammonia or urea flue gas is sprayed intoxIt is reduced into N2
And H2O.Wherein catalyst can use metal class or non-metal kind, specifically refer to the prior art.In a kind of preferred implementation
Catalyst in mode in SCR denitration reaction device can arrange the form of stratification, that is to say, that arrange in SCR denitration reaction device
There is at least two layers of catalyst 17, there is preset distance between each layer catalyst, is conducive to improve NO in flue gas in this wayxReduction effect
Rate.
Economizer 11, ammonia-gas spraying device 12, mixer 13, pre-dedusting device and SCR denitration reaction device edge in the utility model
Flow of flue gas direction is sequentially arranged.Specifically, pre-dedusting device includes the pre- dedusting smoke pipe 10 at least one turning section, in advance
Dedusting smoke pipe is located at the outlet conduit downstream of economizer 11.Pre- dedusting smoke pipe 10 changes flow of flue gas side by its own shape
To, and then realize the separation of larger particles in flue gas, the solid particle after separation drops down onto inside ash bucket.
Ammonia-gas spraying device 12 is set to the outlet conduit of economizer 11, and mixer 13 is set to pre- 10 upstream cigarette of dedusting smoke pipe
Pipe, SCR denitration reaction device are connected to the downstream smoke pipe of pre- dedusting smoke pipe 10.
That is, flue gas first passes through ammonia-gas spraying device 12 after the heat exchange cooling of economizer 11, ammonia-gas spraying device 12 to flue gas into
Row sprinkling ammonia reducing agent, mixing is adjusted using mixer 13 in the flue gas after spraying ammonia, subsequently into pre- dedusting smoke pipe 10,
Using most of dust in the design feature removal flue gas of pre- dedusting smoke pipe 10, the flue gas after pre- dedusting smoke pipe 10 enters
SCR denitration reaction device carries out denitration process under the action of equipment internal accelerator.
Ammonia-gas spraying device 12, mixer 13, pre- dedusting smoke pipe 10 in the utility model are sequentially arranged, and are come out from economizer
Flue gas first sprays ammonia (NH through ammonia-gas spraying device3), velocity of flue gas field is relatively uniform under this state, is conducive to the uniform diffusion of ammonia, a side
Face can flow through longer path and just reach SCR denitration reaction device, be conducive to ammonia and mix with the uniform of flue gas, improve the de- of device
Nitre efficiency, when on the other hand the flue gas containing ammonia passes through mixer, mixer, which further functions as, reduces flue gas internal difference in temperature and strong
Change the mixed effect of both ammonia-flue gases, subsequent flue gas flows into after pre- dedusting smoke pipe is dusted and flows into SCR denitration reaction device again.
It was verified that above-mentioned arrangement can create highly uniform flow field condition for SCR denitration reaction device in the utility model, and
And the exhaust gas dust concentration entered in reactor is lower, the temperature difference is small, is conducive to the efficiency for improving SCR denitration reaction.
In a specific embodiment, the outlet conduit of economizer 11 includes taper necking pipe, along airflow direction, taper
The bore of necking pipe is tapered, and ammonia-gas spraying device 12 is installed on the entrance location or taper pipeline section of taper necking pipe, ammonia-gas spraying device
12 are preferably attached to the largest tube path position (i.e. entrance location) of taper necking pipe 19, certainly, if installation is limited, taper necking
Pipe 19 can also be installed on the taper pipeline section of taper pipeline section.
Taper necking pipe can play the role of flowing to flue gas.
Mixer 13 is located at the outlet port of taper necking pipe, and has between ammonia-gas spraying device 12 and mixer 13 predetermined
Distance is conducive to the sprinkling ammonia of ammonia-gas spraying device 12 in this way and is distributed in flue gas.
Pre- dedusting smoke pipe 10 is mainly dusted flue gas using self structure feature, i.e., is realized using setting turning section
The pre-cleaning of dust, naturally it is also possible to which the installation component inside smoke pipe realizes the clear of flue gas inside dust using the interference of component
It removes.
Pre-dedusting device in the utility model further includes the ash bucket for being connected to pre- dedusting smoke pipe 10, and pre- dedusting smoke pipe 10 wraps
At least two section straight pipes are included, are formed with turning section between each straight pipe.Certainly, turning section can be formed in straight pipe and straight pipe
Between, turning section can also be formed between curved section and curved section or turning section is formed between straight pipe and curved section.
It, can also be with that is, the formation of pre- dedusting smoke pipe 10 can be connected to be formed by two sections or more piece straight pipe
It connects and to be formed by two sections or more piece curved section, can also connect to be formed with curved section by straight pipe certainly.Turning section is phase
Adjacent two connection between pipe sections.
Curved section is usually the round and smooth continuous pipeline section of inner surface, such as segmental arc.
Pre- dedusting smoke pipe 10 in above-described embodiment is provided at least two turning sections, and the flow path of such flue gas is more
Become, is conducive to dust in flue gas and falls into ash bucket under the influence of centrifugal force to be collected.
In a preferred embodiment, in pre- dedusting smoke pipe 10 straight pipe quantity be three sections, three section straight pipes according to
It is secondary to be connected and the first pipe 101 positioned at two sides, the formation U-shaped structure of second pipe 102；Pre- 10 both ends of dedusting smoke pipe pass through the
One pipeline 101 and second pipe 102 are connect with the smoke pipe of corresponding side.Wherein first pipe 101 and the shape of second pipe 102 and
Arrangement form can be set as the case may be.
In another embodiment specific implementation mode, the quantity of straight pipe may be two sections, and two section straight pipes are sequentially connected shape
At V-structure.
The specific embodiment that pre- dedusting smoke pipe 10 is U-shaped structure is given in Fig. 2, straight pipe includes the be sequentially connected
One straight pipe 103, the second straight pipe 104 and third straight pipe 105, the inner wall rounding off of adjacent straight pipe link position.Cigarette
After gas enters U-shaped pre- dedusting smoke pipe 10, since dust receives the effect of gravity and centrifugal force, dust particles deviate flow of flue gas rail
Mark is precipitated inside flue gas, falls in the bottom of pre- dedusting smoke pipe 10.
Certainly, V-structure also has above-mentioned technique effect.
Further, the pipeline section bottom wall in above-mentioned implementation in pre- dedusting smoke pipe 10 in extreme lower position has step surface, platform
Terrace is towards upstream flue gas, i.e. the direction that blows towards flue gas of step surface.Ash bucket 14 is formed in the pipeline section bottom wall of extreme lower position, ash
Bucket 14 is located at step surface upstream position and close to step surface.
By taking U-shaped structure as an example, step surface and ash bucket 14 are all set in the second straight pipe 104, the second straight pipe 104 and turn
Step surface 11a is formed between section, ash bucket 14 is set to the second straight pipe 104, and is located on front side of step surface 11a.
Step surface 11a can play the role of stopping dust particles, and dust particles is avoided to flow into downstream fume gas pipe with flue gas
Road can effectively avoid dust blocking catalyst layer, and SCR denitration reaction device is kept to be in efficient operation state.
In the various embodiments described above, the entrance of SCR denitration reaction device there also is provided rectifier 16, and rectifier 16 is located at each layer and urges
The surface of agent 17, that is to say, that the parallel each layer catalyst 17 of rectifier 16, flue gas flow through in the same direction rectifier 16,
Each layer catalyst 17.Such as Fig. 2, flue gas flows through rectifier 16, each layer catalyst 17 vertically.Three layers of catalysis of setting are given in Fig. 2
The specific embodiment of agent.
Air preheater 18 is arranged in immediately below the necking down pipe outlet of SCR denitration reaction device, i.e., flue gas flows in the same direction
Air preheater 18 and SCR denitration reaction device are crossed, as shown in Fig. 2, flue gas flows through air preheater 18 along the vertical direction and SCR is de-
Nitre reactor.
The smoke pipe distance of catalyst to air preheater can be reduced in this way, and flue gas resistance is small, while flue gas can be uniform
Into air preheater, the risk of air preheater blocking and heat exchange element abrasion is greatly reduced.
The utility model additionally provides a kind of mixer 13 for realizing immixture, and specifically, mixer 13 includes several
The smoke pipe of mixed plate, mixer installation site is rectangular tube, and the mixed plate is installed on the short side wall 1a1 of rectangular tube, i.e. smoke pipe
It is surrounded by the rectangular tube 1a that cross section is rectangle, each short side wall 1a1 is disposed at least one mixed plate along longitudinal direction, and same
Two adjacent mixed plates 131 interlaced arrangement in the width direction on short side wall 1a1.And one end of mixed plate is in short side wall 1a1
Predetermined angular is fixed, and the other end extends to smoke pipe middle part.
That is, one end of mixed plate 131 is fixed on the plate body 1311 of short side wall 1a1 and mixed plate and short side wall presss from both sides
Angle is α.
In above-described embodiment, mixed plate is installed on the shorter side wall of smoke pipe, is conducive to the length for increasing mixed plate, is made cigarette
Gas forms the maelstrom throughout entire smoke pipe section toward smoke pipe intermediate flow, and in 13 downstream of mixer, is tempestuously being vortexed
Under effect, achievees the effect that adjust flue-gas temperature and mix ammonia-flue gas.
In the width direction, short side wall 1a1 can be disposed with a mixed plate 131, can also be with mixing there are two arranged for interval
Plate 131.This is mainly determined according to the size of mixed plate.The width of mixed plate can be about identical as short side wall 1a1, same side wall
A mixed plate is only arranged on same cross section, two mixed plates on same section are positioned opposite, form cigarette therebetween
Road.The shape of mixed plate can be designed as various shapes, and two mixed plates on same cross section are symmetrical about cross-section center.
On same cross section, it is arranged in respect to all mixed plate interlaced arrangements on two short side wall 1a1.In order to increase mixing
The fixed reliability of plate, mixed plate 131 may include plate body 1311 and the extension 1312 that extends internally from plate body, extension
1312 width is equal to 1311 width of plate body or the width of extension 1312 is less than 1311 width of plate body, extension 1312
Quantity is one or two or multiple, each 1312 arranged for interval of extension in the width direction.Specifically, same cross section
On, it is arranged in the extensions of all mixed plates 131 of opposite two short side wall 1a1 also interlaced arrangement in the width direction.
The specific structure of four kinds of mixers 13 is given in Fig. 4 a to Fig. 4 d, the main distinction is the structure and ruler of mixed plate
Very little difference, wherein mixed plate is L-type structure, the extension interlaced arrangement of the L-type structure of two pairs of mounting in Fig. 4 a.It is mixed in Fig. 4 b
Plate is rectangular slab, the width of the rectangular slab substantially a quarter of short side wall 1a1, and the rectangular slab on two short side wall 1a1 interlocks cloth
It sets.Mixed plate is comb teeth shape in Fig. 4 c, and the width of plate body 1311 is substantially equal to short side wall 1a1, on plate body 1311 setting two or
The more than two extensions of person, opposite each extension are staggered.Mixed plate structure is rectangle in Fig. 4 d, and width is substantially
The half of short side wall 1a1.
Plate body 1311 is installed close to the tube wall of smoke pipe, and other than fixing with short side wall 1a1, side can also be consolidated mixed plate
Due on other side walls, to increase installation reliability.
In the various embodiments described above, the connecting pipe between pre- dedusting smoke pipe 10 and SCR denitration reaction device has bend portion, curved
Road portion is also equipped with diversion component 15, to carry out water conservancy diversion to flue gas.
Following present a kind of specific embodiment, the main design parameters of specific embodiment are as follows: exhaust gas volumn is
1360000m3/ h, average smoke temperature are 360 DEG C, and maximum temperature difference is 40 DEG C, and 11 Exit temperature distribution of economizer is as shown in Figure 6；Save coal
It is 45g/Nm that device 11, which exports dust concentration,3, dust size range is 1~200 μm, and average grain diameter is 36 μm；Ammonia spraying amount is
150Nm3/ h, spray ammonia system dilution air quantity is 2850Nm3/h；Three layers of catalyst are installed, every layer of catalyst resistance is 150Pa, empty
18 resistance of air preheater is 800Pa.
The threedimensional model key dimension of specific embodiment is as follows: the smoke pipe cross section that economizer 11 exports is 10m × 8.4m,
The smoke pipe cross section for installing mixer 13 is 4m × 7.6m, and mixer 13 uses Fig. 4 (a) form, and catalyst size is 9m × 10m
× 1.15m, ammonia-gas spraying device 12 are made of the spray ammonia branch pipe that 6 diameters are 133mm, and it is 25mm that 10 diameters are opened up on every branch pipe
Small spout.
The results are shown in Table 1 for the numerical experiments of specific embodiment, as it can be seen from table 1 the flue gas that the present invention takes
SCR denitration device and method flow field uniformity are very good, are much better than technical requirements, while also having higher pre- dust removing effects, can
Denitrification apparatus is effectively ensured efficiently to run steadily in the long term.
1 numerical simulation result of table
Refer to the prior art for the otherwise data of flue gas SCR denitration device, does not repeat them here herein.
A kind of flue gas SCR denitration device provided by the utility model is described in detail above.It is used herein
Specific case is expounded the principles of the present invention and embodiment, and the explanation of above example is only intended to help
Understand the method and its core concept of the utility model.It should be pointed out that for those skilled in the art,
Under the premise of not departing from the utility model principle, several improvements and modifications can be made to this utility model, these improve and
Modification is also fallen into the protection scope of the utility model claims.
Claims (10)
1. a kind of flue gas SCR denitration device with mixed fume and dust effect, which is characterized in that be located at economizer and air preheater
Between smoke pipe, the flue gas SCR denitration device includes with lower component: ammonia-gas spraying device (12), mixer (13), pre-dedusting device and
SCR denitration reaction device equipped with catalyst (17), wherein the ammonia-gas spraying device (12) is set to the outlet of the economizer (11)
Pipeline, the pre-dedusting device include the pre- dedusting smoke pipe (10) at least one turning section, the pre- dedusting smoke pipe (10)
Positioned at the outlet conduit downstream of the economizer (11), the mixer (13) is set to pre- dedusting smoke pipe (10) the upstream cigarette
Pipe, the SCR denitration reaction device are connected to the downstream smoke pipe of the pre- dedusting smoke pipe (10).
2. the flue gas SCR denitration device with mixed fume and dust effect according to claim 1, which is characterized in that the province
The outlet conduit of coal device (11) includes taper necking pipe, and along airflow direction, the bore of the taper necking pipe is tapered, the spray
Ammonia device (12) is installed on the taper pipeline section of the taper necking pipe or the entrance location of the taper necking pipe, the mixing
Device (13) is located at the outlet port of the taper necking pipe, and has between the ammonia-gas spraying device (12) and the mixer (13)
There is preset distance.
3. the flue gas SCR denitration device with mixed fume and dust effect according to claim 1, which is characterized in that described pre-
Dust-extraction unit further includes the ash bucket (14) for being connected to the pre- dedusting smoke pipe (10), and the pre- dedusting smoke pipe (10) includes at least two
Straight pipe is saved, is formed with the turning section between each straight pipe.
4. the flue gas SCR denitration device with mixed fume and dust effect according to claim 3, which is characterized in that described straight
The quantity of pipeline section is three sections, and three section straight pipes, which are sequentially connected, forms U-shaped structure with the first pipe positioned at two sides, second pipe；
Alternatively, the quantity of the straight pipe is two sections, two section straight pipes are connected to form V-structure.
5. the flue gas SCR denitration device with mixed fume and dust effect according to claim 3, which is characterized in that described pre-
Pipeline section bottom wall in dedusting smoke pipe (10) in extreme lower position has step surface, and the step surface is towards upstream flue gas, the ash
Bucket (14) is formed in the pipeline section bottom wall of the extreme lower position, and the ash bucket (14) is located at the step surface upstream position and close to institute
State step surface.
6. the flue gas SCR denitration device with mixed fume and dust effect according to claim 1, which is characterized in that further include
Rectifier is disposed at least two layers of catalyst (17), the rectifier in the SCR denitration reaction device and is arranged in each layer catalyst
(17) surface, the air preheater are arranged in immediately below the necking down pipe outlet of the SCR denitration reaction device；It is described pre- to remove
Diversion component is installed inside connecting pipe between cloud of dust pipe (10) and the SCR denitration reaction device.
7. the flue gas SCR denitration device with mixed fume and dust effect according to any one of claims 1 to 6, feature exist
In the mixer (13) includes several mixed plates (131), and the smoke pipe of the mixer installation site is rectangular tube (1a), institute
The short side wall that mixed plate (131) is installed on the rectangular tube is stated, each short side wall (1a1) is disposed at least one along longitudinal direction
Mixed plate (131), adjacent two mixed plates (131) interlaced arrangement in the width direction on same short side wall (1a1)；And it is described mixed
One end of plywood (131) is fixed with the short side wall (1a1) in predetermined angular, and the other end extends to the smoke pipe middle part.
8. the flue gas SCR denitration device with mixed fume and dust effect according to claim 7, which is characterized in that described mixed
Plywood (131) includes plate body (1311) and the extension (1312) that extends internally from the plate body (1311), the extension
(1312) width is equal to the plate body (1311) width；
Alternatively, the width of the extension (1312) is less than the plate body (1311) width, the quantity of the extension (1312)
For one or two or multiple, all extension (1312) arranged for interval in the width direction.
9. the flue gas SCR denitration device with mixed fume and dust effect according to claim 8, which is characterized in that same cross
On section, the extension (1312) for being arranged in all mixed plates (131) of opposite two the first side walls also interlocks cloth in the width direction
It sets.
10. the flue gas SCR denitration device with mixed fume and dust effect according to claim 8, which is characterized in that described to prolong
Extending portion is straight panel or arc panel.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111520561A (en) * | 2020-04-20 | 2020-08-11 | 杭州喜马拉雅信息科技有限公司 | S-shaped variable-wavelength dust recovery pipeline |
| CN111603930A (en) * | 2020-06-02 | 2020-09-01 | 黄伟 | Clean briquette burning boiler |
| CN111686541A (en) * | 2020-05-08 | 2020-09-22 | 北新集团建材股份有限公司 | Dust removal device and dust removal equipment |
| CN112717689A (en) * | 2019-10-28 | 2021-04-30 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Selective catalytic reduction denitration device and method |
| CN112742231A (en) * | 2019-10-29 | 2021-05-04 | 中国石油化工股份有限公司 | Ammonia spraying static mixer and dust removal method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112717689A (en) * | 2019-10-28 | 2021-04-30 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Selective catalytic reduction denitration device and method |
| CN112742231A (en) * | 2019-10-29 | 2021-05-04 | 中国石油化工股份有限公司 | Ammonia spraying static mixer and dust removal method |
| CN111520561A (en) * | 2020-04-20 | 2020-08-11 | 杭州喜马拉雅信息科技有限公司 | S-shaped variable-wavelength dust recovery pipeline |
| CN111686541A (en) * | 2020-05-08 | 2020-09-22 | 北新集团建材股份有限公司 | Dust removal device and dust removal equipment |
| CN111603930A (en) * | 2020-06-02 | 2020-09-01 | 黄伟 | Clean briquette burning boiler |
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