CN109966899A - Trough mixer device for realizing efficient SNCR (selective non-catalytic reduction) denitration of flue gas of pulverized coal fired boiler - Google Patents
Trough mixer device for realizing efficient SNCR (selective non-catalytic reduction) denitration of flue gas of pulverized coal fired boiler Download PDFInfo
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- CN109966899A CN109966899A CN201910376523.9A CN201910376523A CN109966899A CN 109966899 A CN109966899 A CN 109966899A CN 201910376523 A CN201910376523 A CN 201910376523A CN 109966899 A CN109966899 A CN 109966899A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000003546 flue gas Substances 0.000 title claims abstract description 31
- 239000003245 coal Substances 0.000 title claims abstract description 29
- 238000010531 catalytic reduction reaction Methods 0.000 title description 2
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 62
- 239000010959 steel Substances 0.000 claims abstract description 62
- 239000007921 spray Substances 0.000 claims description 5
- 241000628997 Flos Species 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 210000000038 chest Anatomy 0.000 claims 1
- 239000003054 catalyst Substances 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000003638 chemical reducing agent Substances 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 230000003134 recirculating effect Effects 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 230000003993 interaction Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 239000000908 ammonium hydroxide Substances 0.000 description 1
- 238000006701 autoxidation reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- 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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- 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 provides a trough mixer device for realizing efficient SNCR denitration of pulverized coal boiler flue gas, which comprises a trough mixer arranged between a hearth outlet flue and a downstream flue, wherein the trough mixer at least comprises two layers of trough mixer bodies, and each layer of trough mixer body comprises a plurality of equidistantly arranged trough section steels; the invention realizes higher SNCR denitration efficiency, thereby greatly reducing the concentration of NOx in front of the SCR device of the pulverized coal boiler, being beneficial to reducing the dosage of the SCR catalyst, prolonging the service life of the catalyst, reducing the cost on the replacement and disposal of the catalyst and generating good economic benefit.
Description
Technical field
The invention belongs to coal-burning boiler environmental technology field, in particular to the efficient SNCR of a kind of realization pulverized-coal fired boiler flue gas is de-
The trough mixers device of nitre.
Background technique
As environmental problem becomes increasingly conspicuous, national environmental protection policy is more stringent, " the coal electricity energy-saving and emission-reduction liter promulgated in 2014
Grade and transformation action plan 2014-2020 " require coal unit NOx emission concentration that must be lower than 50mg/Nm3.Selectivity is non-to urge
Change reduction SNCR denitration technology as the gas denitrifying technology for being only second to SCR and being widely used, on recirculating fluidized bed CFB
It is used widely.
SNCR denitration to realize high efficiency, need to meet suitable smoke temperature window, flue gas reducing agent be sufficiently mixed and enough
The conditions such as residence time, if SNCR denitration technology is applied to pulverized-coal fired boiler, as introduced in pertinent literature in pulverized-coal fired boiler
Reducing agent is sprayed in burner hearth, due to smoke temperature height and mixed effect difference etc., the relatively low highest of denitration efficiency is less than 30%, therefore SNCR
Denitration technology is in pulverized-coal fired boiler denitrating flue gas using less.
Summary of the invention
The purpose of the present invention is to provide a kind of trough mixers device for realizing the efficient SNCR denitration of pulverized-coal fired boiler flue gas,
Solve it is existing selective non-catalytic reduction is applied in pulverized-coal fired boiler denitrating flue gas, there are out of stock low efficiencys
The problem of.
In order to achieve the above object, the technical solution adopted by the present invention is that:
A kind of trough mixers device for realizing the efficient SNCR denitration of pulverized-coal fired boiler flue gas provided by the invention, including arrangement
Trough mixers between furnace outlet flue and downstream flue, trough mixers include at least two layers of trough mixers ontology,
Every layer of trough mixers ontology includes multiple U-steels being placed equidistant with.
Preferably, the open end of U-steel and slot on rest layers trough mixers ontology on first layer trough mixers ontology
The open end of fashioned iron is positioned opposite.
Preferably, runner is formed with layer arrangement and between two adjacent U-steels；Later layer trough mixers ontology
The center line of U-steel is overlapped with the center line for the runner that preceding layer trough mixers ontology U-steel is formed.
Preferably, the first screen formula heat exchanger is provided at the floss hole of furnace outlet flue, the first screen formula heat exchanger is placed in
The upstream of trough mixers.
Preferably, SNCR Pneumatic type spray gun is provided between the first screen formula heat exchanger and trough mixers.
Preferably, the downstream of trough mixers there also is provided the second screen formula heat exchanger.
Preferably, the height of U-steel is 300mm, leg width is 89mm, waist thickness is 11.5mm, average leg with a thickness of
13.5mm。
Preferably, it is placed in same layer and the through-flow spacing between two adjacent U-steels is 123mm；The mixing of first layer slot type
Between the upper surface of the open end of the upper surface and second layer trough mixers ontology U-steel of device ontology U-steel open end
Spacing is 61.5mm；The lower surface of first layer trough mixers ontology U-steel open end and second layer trough mixers ontology slot
Spacing between the lower surface of the open end of fashioned iron is 61.5mm；
The end of the open end of the bottom and second layer trough mixers U-steel of first layer trough mixers ontology U-steel
Through-flow spacing between portion is 39~78mm.
Compared with prior art, the beneficial effects of the present invention are:
A kind of trough mixers device for realizing the efficient SNCR denitration of pulverized-coal fired boiler flue gas provided by the invention, high-temperature flue gas
Into trough mixers, flue gas accelerates in trough mixers, and recirculating zone is formed at trough mixers inner corner, promotes
Interaction between the evaporation and evaporation product and flue gas of reducing agent droplet.Simultaneously as trough mixers outlet and and its
Difference of the downstream flue of linking on flow area causes flue gas and reducing agent after entering downstream flue due to the change of speed
Change can be mixed further, i.e., using for trough mixers will make reducing agent that good mix can be achieved under shorter flow distance
Effect is closed, the depth of SNCR denitration will be promoted to carry out；
Meanwhile if being sufficiently mixed for reducing agent and flue gas can be fast implemented, amino reductive can be effectively reduced in high temperature ring
Autoxidation share in border, to promote its share for being used for NOx reduction.In suitable ammonia nitrogen molar ratio and flue gas/reducing agent
Under conditions of Quick uniform mixing, the SNCR denitration efficiency of up to 1000 DEG C of high-temperature flue gas is generally up to 60%~70%, most
Height is close to 80%；
The present invention realizes higher SNCR denitration efficiency, so that the NOx significantly reduced before pulverized-coal fired boiler SCR device is dense
Degree, advantageously reduces the dosage of SCR catalyst, and extend the service life of catalyst, lowers on catalyst change and disposition
Cost, generate good economic benefit.
Detailed description of the invention
Fig. 1 is layout drawing of the trough mixers device of the present invention in pulverized-coal fired boiler flue；
Fig. 2 is top view of the trough mixers device in pulverized-coal fired boiler flue；
Fig. 3 is the U-steel figure for constructing trough mixers；
Fig. 4 is layout drawing of the U-steel in trough mixers.
Specific embodiment
With reference to the accompanying drawing, the present invention is described in more detail.
As depicted in figs. 1 and 2, a kind of slot type mixing for realizing the efficient SNCR denitration of pulverized-coal fired boiler flue gas provided by the invention
Device device, including furnace outlet flue 1, the first screen formula heat exchanger 2, SNCR Pneumatic type spray gun 3, trough mixers 4, the second screen formula
Heat exchanger 6 and downstream flue 5, wherein the first screen formula heat exchanger 2, SNCR Pneumatic type spray gun 3, trough mixers 4 and the second screen formula
Heat exchanger 6 is sequentially arranged in the inner cavity of furnace outlet flue 1 of pulverized-coal fired boiler.
As shown in figure 3, the basic component units of trough mixers 4 are U-steel 6, the material of U-steel 6 is that 310S is stainless
Steel, can be used standard channel steel part or according to Optimized Simulated data customization, critical size is height, waist thickness, average leg thickness
It is wide with leg.The specific size of the U-steel 6 of trough mixers 4 suitable for the efficient SNCR denitration of large coal powder boiler flue gas is optional
Be selected as: the height H of U-steel 6 is 300mm, and the wide W of leg is 89mm, and waist thickness D is 11.5mm, and average leg thickness d is 13.5mm, length
L is according to depending on 5 height of downstream flue.
As shown in figure 4, trough mixers 4 include at least two layers of trough mixers ontology, every layer of trough mixers ontology packet
Include multiple U-steels 6 being placed equidistant with；It is placed between two adjacent U-steels 6 of same layer and is formed with runner.
The open end of U-steel 6 and U-steel on rest layers trough mixers ontology on first layer trough mixers ontology
Open end is positioned opposite.
Center line and preceding layer trough mixers ontology U-steel 6 formation of later layer trough mixers ontology U-steel 6
Runner center line be overlapped.
In the present embodiment, trough mixers 4 use two-layer structure, wherein first layer trough mixers ontology U-steel 6 etc.
Away from arrangement, second layer trough mixers ontology U-steel 6 and 6 snapping of first time trough mixers ontology U-steel are arranged, in cloth
When setting, in the runner that the center line and first layer trough mixers ontology of second layer trough mixers ontology U-steel 6 are formed
Heart line is overlapped.
Wherein, the through-flow spacing L3 for being placed in the U-steel 6 of same layer is 123mm, first layer trough mixers ontology U-steel 6
The upper and lower surface of the open end spacing between the upper and lower surface of the open end of second layer trough mixers ontology U-steel 6 respectively
L2 is equal, and is 61.5mm, and through-flow spacing should be kept constant as far as possible in U-steel 6, be flowed inside it to avoid high velocity smoke
The variation of reason flow area and generate the biggish pressure loss.
Second layer trough mixers ontology U-steel 6 is inserted into first layer trough mixers ontology U-steel, and the second layer
The slot bottom of trough mixers ontology U-steel 6 is through-flow, and spacing L1 is 39~78mm, and specific value depends on expected SNCR denitration effect
Tradeoff between rate and flow resistance.
In the present embodiment, trough mixers 4 use three-decker, wherein first layer trough mixers ontology U-steel 6 etc.
Away from arrangement, second layer trough mixers ontology U-steel 6 and 6 snapping of first time trough mixers ontology U-steel are arranged, third
Layer trough mixers ontology U-steel 6 is arranged with 6 snapping of first time trough mixers ontology U-steel.
In arrangement, the center line and this bodily form of first layer trough mixers of second layer trough mixers ontology U-steel 6
At runner center line be overlapped；The center line and second layer trough mixers sheet of third layer trough mixers ontology U-steel 6
The center line for the runner that body is formed is overlapped.
The end of the open end of third layer trough mixers ontology U-steel 6 and second layer trough mixers ontology U-steel
Through-flow spacing L1 between 6 bottom is 39~78mm.
In the upper surface of third layer trough mixers ontology U-steel 6 and second layer trough mixers ontology U-steel 6
Through-flow spacing L4 between heart line is 61.5mm.
In the arranged downstream SNCR Pneumatic type spray gun 3 of the screen formula heat exchanger 2 of the furnace outlet flue 1 of pulverized-coal fired boiler, to
SNCR denitration reducing agent solution such as ammonium hydroxide or urea liquid etc. are sprayed into furnace outlet flue 1.The reducing agent being crushed through strength
Droplet starts to evaporate under the encapsulation of high-temperature flue gas and enters trough mixers 4, and flue gas accelerates in trough mixers 4,
And recirculating zone is formed at 4 inner corner of trough mixers, between the evaporation and evaporation product and flue gas that promote reducing agent droplet
Interaction.Simultaneously as the difference of the outlet of trough mixers 4 and the downstream flue 5 being connected with it on flow area, leads
Cause flue gas and reducing agent after entering downstream flue 5 since the variation of speed can be mixed further, i.e. the use of trough mixers 4
It will make reducing agent that good mixed effect can be achieved under shorter flow distance, the depth of SNCR denitration will be promoted to carry out.
Claims (8)
1. a kind of trough mixers device for realizing the efficient SNCR denitration of pulverized-coal fired boiler flue gas, which is characterized in that including arranging furnace
Trough mixers (4) between thorax exhaust pass (1) and downstream flue (5), it is mixed that trough mixers (4) include at least two layers of slot type
Clutch ontology, every layer of trough mixers ontology include multiple U-steels (6) being placed equidistant with.
2. a kind of trough mixers device for realizing the efficient SNCR denitration of pulverized-coal fired boiler flue gas according to claim 1,
It is characterized in that, the open end of U-steel (6) and groove profile on rest layers trough mixers ontology on first layer trough mixers ontology
The open end of steel (6) is positioned opposite.
3. a kind of trough mixers device for realizing the efficient SNCR denitration of pulverized-coal fired boiler flue gas according to claim 1,
It is characterized in that, is formed with runner with layer arrangement and between two adjacent U-steels (6)；Later layer trough mixers ontology groove profile
The center line of steel (6) is overlapped with the center line for the runner that preceding layer trough mixers ontology U-steel (6) is formed.
4. a kind of trough mixers device for realizing the efficient SNCR denitration of pulverized-coal fired boiler flue gas according to claim 1,
It is characterized in that, the first screen formula heat exchanger (2) is provided at the floss hole of furnace outlet flue (1), and the first screen formula heat exchanger (2) is set
In the upstream of trough mixers (4).
5. a kind of trough mixers device for realizing the efficient SNCR denitration of pulverized-coal fired boiler flue gas according to claim 4,
It is characterized in that, is provided with SNCR Pneumatic type spray gun (3) between the first screen formula heat exchanger (2) and trough mixers (4).
6. a kind of trough mixers device for realizing the efficient SNCR denitration of pulverized-coal fired boiler flue gas according to claim 1,
It is characterized in that, the downstream of trough mixers (4) there also is provided the second screen formula heat exchanger (6).
7. a kind of trough mixers device for realizing the efficient SNCR denitration of pulverized-coal fired boiler flue gas according to claim 1,
It is characterized in that, the height of U-steel (6) is 300mm, leg width is 89mm, waist thickness is 11.5mm, average leg is with a thickness of 13.5mm.
8. a kind of trough mixers device for realizing the efficient SNCR denitration of pulverized-coal fired boiler flue gas according to claim 1,
It is characterized in that, is placed in same layer and the through-flow spacing between two adjacent U-steels (6) is 123mm；First layer trough mixers
The upper surface of the open end of the upper surface and second layer trough mixers ontology U-steel (6) of ontology U-steel (6) open end it
Between spacing be 61.5mm；The lower surface of first layer trough mixers ontology U-steel (6) open end is mixed with second layer slot type
Spacing between the lower surface of the open end of device ontology U-steel (6) is 61.5mm；
The open end of the bottom and second layer trough mixers U-steel (6) of first layer trough mixers ontology U-steel (6)
Through-flow spacing between end is 39~78mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910376523.9A CN109966899B (en) | 2019-05-07 | 2019-05-07 | Groove type mixer device for realizing efficient SNCR denitration of pulverized coal boiler flue gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910376523.9A CN109966899B (en) | 2019-05-07 | 2019-05-07 | Groove type mixer device for realizing efficient SNCR denitration of pulverized coal boiler flue gas |
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| CN109966899A true CN109966899A (en) | 2019-07-05 |
| CN109966899B CN109966899B (en) | 2024-01-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021218076A1 (en) * | 2020-04-29 | 2021-11-04 | 华能国际电力股份有限公司 | Novel mixer structure suitable for sncr denitration of high-temperature flue gas from pulverized coal boiler |
| WO2021218075A1 (en) * | 2020-04-29 | 2021-11-04 | 华能国际电力股份有限公司 | Flue mixer structure for sncr denitrification of pulverized coal boiler flue gas |
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