CN107754587A - A kind of flue gas recirculation denitrification apparatus in grate firing boiler - Google Patents
A kind of flue gas recirculation denitrification apparatus in grate firing boiler Download PDFInfo
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- CN107754587A CN107754587A CN201711053175.9A CN201711053175A CN107754587A CN 107754587 A CN107754587 A CN 107754587A CN 201711053175 A CN201711053175 A CN 201711053175A CN 107754587 A CN107754587 A CN 107754587A
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- flue gas
- gas recirculation
- firing boiler
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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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- 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
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention discloses the flue gas recirculation denitrification apparatus in a kind of grate firing boiler, it is arranged in the boiler of grate firing boiler burner hearth of the upper lateral part provided with perforate, the fire grate for being arranged on grate firing boiler burner hearth interior bottom portion and there is air compartment, deduster, chimney, air-introduced machine and flue gas recirculation blower fan, including：Flue gas recirculation pipeline, including the first flue gas recirculation pipeline being connected in perforate, the 3rd flue gas recirculation pipeline with the second flue gas recirculation pipeline of the first flue gas recirculation pipeline communication and with the second flue gas recirculation pipeline communication；And SNCR pipelines, with the first branch and the second branch, wherein, 3rd flue gas recirculation pipeline extends to grate firing boiler burner hearth, lower flue gas recirculation layer and upper flue gas recirculation layer will be divided into inside grate firing boiler burner hearth, the first branch extends on the top of upper flue gas recirculation layer, the top of upper flue gas recirculation layer is divided to form upper SNCR layers, second branch extends on the top of lower flue gas recirculation layer, and the top of lower flue gas recirculation layer is divided to form lower SNCR layers.
Description
Technical field
The invention belongs to grate firing boiler field, and in particular to the flue gas recirculation denitrification apparatus in a kind of grate firing boiler.
Background technology
Fuel combustion process is one of important sources of air environmental pollution thing, to health, air quality and weather
Change produces very important influence.Nitrogen oxides (NOx) be fuel burn in the boiler produce major pollutants discharged it
One, realize cleaning burning, reduce boiler NOxDischarge effect on environment has important environment and realistic meaning.
Temperature is relatively low in grate furnace, and for the flue-gas temperature of general throat location at 600 DEG C~800 DEG C or so, the temperature is general
It is relevant with the ratio of furnace bottom air distribution.However, SNCR has reaction temperature window, typically at 800 DEG C~1150 DEG C.It is general optimal
SNCR eject positions require that flue-gas temperature about at 1000 DEG C, is arranged in grate furnace top.It is relatively low in grate firing boiler local location
Flue-gas temperature, directly influence SNCR denitration effect.
High temperature distribution in grate furnace, mainly appear on solid fuel surface on fire grate and near, aditus laryngis flame kernel
Position, in grate furnace top in uncombusted CO and flying dust the combustion reaction heat release of coke region.Typically, SNCR is arranged on stove
Near wall, range of jet is relatively low, can not cover wider, and high-temperature area is narrow, effective residence time of SNCR reactions
Shorter, this all causes the less efficient of SNCR denitration, or largely after spray ammonia the problems such as the escaping of ammonia.
The content of the invention
The present invention is, and it is an object of the present invention to provide a kind of flue gas recirculation in grate firing boiler in order to solving the above problems and carry out
Denitrification apparatus.
The invention provides the flue gas recirculation denitrification apparatus in a kind of grate firing boiler, is arranged on a upper lateral part and is provided with perforate
Grate firing boiler burner hearth, be arranged on grate firing boiler burner hearth interior bottom portion and with the fire grate of air compartment, deduster, chimney, air-introduced machine with
And in the boiler of flue gas recirculation blower fan, have the feature that, including：Flue gas recirculation pipeline, including be connected in perforate
One flue gas recirculation pipeline, with the second flue gas recirculation pipeline of the first flue gas recirculation pipeline communication and with the second flue gas recirculation pipe
3rd flue gas recirculation pipeline of road connection；And SNCR pipelines, there is the first branch and the second branch, wherein, the 3rd flue gas follows
Endless tube road extends to grate firing boiler burner hearth, and lower flue gas recirculation layer and upper flue gas recirculation layer will be divided into inside grate firing boiler burner hearth, the
One branch extends on the top of upper flue gas recirculation layer, and the top of upper flue gas recirculation layer is divided to form upper SNCR layers, the second branch
Extend on the top of lower flue gas recirculation layer, the top of lower flue gas recirculation layer is divided to form lower SNCR layers.
In flue gas recirculation denitrification apparatus in grate firing boiler provided by the invention, it can also have the feature that：Its
In, the bottom of lower flue gas recirculation layer is sequentially provided with the face arch aditus laryngis and rear arch larynx being arranged on grate firing boiler furnace wall from top to bottom
Mouthful.
In flue gas recirculation denitrification apparatus in grate firing boiler provided by the invention, it can also have the feature that：Its
In, the both sides inside grate firing boiler are provided with positioned at 4 of the top of face arch aditus laryngis or 3 lower floor's flue gas recirculation sprays
Mouth, the nozzle are arranged on grate firing boiler furnace wall and dipped down to the central horizontal position between face arch aditus laryngis and rear arch aditus laryngis.
In flue gas recirculation denitrification apparatus in grate firing boiler provided by the invention, it can also have the feature that：Its
In, flue gas recirculation nozzle, the nozzle on 4 in upper flue gas recirculation layer are provided with the front side inside grate firing boiler and is set
Put on grate firing boiler furnace wall.
In flue gas recirculation denitrification apparatus in grate firing boiler provided by the invention, it can also have the feature that：Its
In, 4 lower SNCR nozzles in lower SNCR layers are provided with the front side inside grate firing boiler, the nozzle is arranged on layer combustion
On boiler wall.
In flue gas recirculation denitrification apparatus in grate firing boiler provided by the invention, it can also have the feature that：Its
In, SNCR nozzles on 4 in upper SNCR layers are provided with the front side inside grate firing boiler, inside grate firing boiler
SNCR nozzles on 2 in upper SNCR layers are respectively arranged with both sides.
In flue gas recirculation denitrification apparatus in grate firing boiler provided by the invention, it can also have the feature that：Its
In, the internal diameter of the first flue gas recirculation pipeline is more than the internal diameter of the second flue gas recirculation pipeline, and the internal diameter of the second flue gas recirculation pipeline is big
In the internal diameter of the 3rd flue gas recirculation pipeline.
In flue gas recirculation denitrification apparatus in grate firing boiler provided by the invention, it can also have the feature that：Its
In, the amount of circulating gas of lower flue gas recirculation layer and upper flue gas recirculation layer accounts for the 3%~8% of total exhaust gas volumn.
The effect of invention and effect
Flue gas recirculation denitrification apparatus in grate firing boiler involved in the present invention is because used lower flue gas recirculation
Layer can effectively lift the air-flow mixing of aditus laryngis, promote the mixed heat transfer of aditus laryngis central high temperature flame and flue gas near wall, promote
Enter CO and O in aditus laryngis and upper space2Mixing and after-flame, it is achieved that flue-gas temperature is integrally lifted.It is because used
Upper flue gas recirculation layer is arranged in grate furnace burner hearth, so improving residence time of the flow of flue gas in stove, while cooperates with increasing
Plus the accessible depth of SNCR layers injection advance, SNCR is set to cover broader stove inner section.Therefore, layer of the invention combustion pot
Flue gas recirculation denitrification apparatus in stove can realize that the flue-gas temperature of greater room in stove meets SNCR reaction temperature windows, SNCR
Also broader stove inner section can be covered, more effectively reduce NO in discharge flue gasxConcentration, ammonia solution emitted dose is reduced, may be used also
It is widely used in layer combustion chain-grate boiler, especially coal burning layered boiler, garbage burning boiler and the biomass chain of pluralities of fuel
Boiler etc. and to realizing NOxDepth emission reduction plays an important role.
Brief description of the drawings
Fig. 1 is the structural representation in embodiments of the invention；
Fig. 2 is the arrangement schematic diagram of the lower flue gas recirculation nozzle in embodiments of the invention；
Fig. 3 is the arrangement top view of the lower flue gas recirculation nozzle in embodiments of the invention；
Fig. 4 is the arrangement top view of the upper flue gas recirculation nozzle in embodiments of the invention；
Fig. 5 is the arrangement top view of the lower SNCR nozzles in embodiments of the invention；
Fig. 6 is the arrangement top view of the upper SNCR nozzles in embodiments of the invention.
Embodiment
In order that the technological means that the present invention realizes is easy to understand with effect, with reference to embodiments and accompanying drawing is to this
Invention is specifically addressed.
Embodiment：
Fig. 1 is the structural representation in embodiments of the invention.
As shown in figure 1, the flue gas recirculation denitrification apparatus 100 in a kind of grate firing boiler of the present embodiment, is arranged on side
Portion is provided with the grate firing boiler burner hearth 1 of perforate, is arranged on the interior bottom portion of grate firing boiler burner hearth 1 and the fire grate 3 with air compartment 4, dedusting
Device 5, chimney 6, air-introduced machine 7 and flue gas recirculation blower fan 8 boiler in, including：Flue gas recirculation pipeline 2 and SNCR pipelines 9.
Grate firing boiler burner hearth 1, its side top are provided with a perforate.
Flue gas recirculation pipeline 2, including the first flue gas recirculation pipeline being connected in perforate, with the first flue gas recirculation pipeline
Second flue gas recirculation pipeline of connection and the 3rd flue gas recirculation pipeline with the second flue gas recirculation pipeline communication.
The internal diameter of first flue gas recirculation pipeline be more than the second flue gas recirculation pipeline internal diameter, the second flue gas recirculation pipeline it is interior
Footpath is more than the internal diameter of the 3rd flue gas recirculation pipeline.
SNCR pipelines 9, there is the first branch and the second branch.
3rd flue gas recirculation pipeline extends to grate firing boiler burner hearth 1, will be divided into lower flue gas recirculation inside grate firing boiler burner hearth 1
Layer A and upper flue gas recirculation layer C.
Fig. 2 is the arrangement schematic diagram of the lower flue gas recirculation nozzle in embodiments of the invention.
As shown in Fig. 2 lower flue gas recirculation layer A bottom is sequentially provided with before being arranged on grate firing boiler furnace wall from top to bottom
Encircle aditus laryngis E and rear arch aditus laryngis F.
Fig. 3 is the arrangement top view of the lower flue gas recirculation nozzle in embodiments of the invention.
As shown in figure 3, the both sides inside grate firing boiler are provided with 4 or 3 of face arch aditus laryngis E top
Layer flue gas recirculation nozzle, the nozzle are arranged on grate firing boiler furnace wall and dipped down between face arch aditus laryngis E and rear arch aditus laryngis F
Central horizontal position, inclination angle α, its size are 5 °~15 °.
Fig. 4 is the arrangement top view of the upper flue gas recirculation nozzle in embodiments of the invention.
As shown in figure 4, flue gas on 4 be provided with the front side inside grate firing boiler in upper flue gas recirculation layer C
Circulation nozzle, the nozzle are arranged on grate firing boiler furnace wall.
Lower flue gas recirculation layer A and upper flue gas recirculation layer C amount of circulating gas account for the 3%~8% of total exhaust gas volumn.
First branch extends on upper flue gas recirculation layer C top, and upper flue gas recirculation layer C top is divided to form upper SNCR
Layer D.
Second branch extends on lower flue gas recirculation layer A top, and lower flue gas recirculation layer A top is divided to form lower SNCR
Layer B.
Fig. 5 is the arrangement top view of the lower SNCR nozzles in embodiments of the invention.
As shown in figure 5,4 lower SNCR nozzles being provided with the front side inside grate firing boiler in lower SNCR layers B,
The nozzle is arranged on grate firing boiler furnace wall.
Fig. 6 is the arrangement top view of the upper SNCR nozzles in embodiments of the invention.
As shown in fig. 6,8 upper SNCR nozzles are arranged on the furnace wall of grate firing boiler altogether, wherein inside grate firing boiler
Front side on be provided with SNCR nozzles on 4 in upper SNCR layers D, be respectively arranged with the both sides inside grate firing boiler
2 upper SNCR nozzles in upper SNCR layers D.
Deduster 5 in grate firing boiler is arranged on the first flue gas recirculation pipeline and the second flue gas recirculation pipeline junction, cigarette
The flue gas recirculation pipeline communication of chimney 6 and second, air-introduced machine 7 are arranged in the second flue gas recirculation pipeline, and flue gas recirculation blower fan 8 is located at
In three flue gas recirculation pipelines.
A kind of course of work of flue gas recirculation denitrification apparatus in the grate firing boiler of the present embodiment：
In flue gas recirculation denitrification apparatus 100 in a kind of grate firing boiler of the present embodiment, circulating flue gas is through air-introduced machine 7 and cigarette
Gas circulating fan 8 is drawn through flue gas recirculation pipeline 2 after deduster 5 and enters grate firing boiler burner hearth 1, that is, passes through upper flue gas recirculation
Nozzle and lower flue gas recirculation nozzle enter grate firing boiler burner hearth 1；SNCR is fired by upper SNCR nozzles and lower SNCR nozzles into layer
Boiler furnace 1.It is in addition, all inclined by the temperature of boiler front wall and rear wall displacement in throat location, general flame kernel temperature drift
It is low；And it is higher by the CO concentration at grate firing boiler face arch aditus laryngis E, and oxygen is concentrated mainly at rear arch aditus laryngis F.Lower flue gas follows
The flame flow that circular layer A flue gas recirculation can be effectively increased aditus laryngis efficiently mixes, and promotes CO and O2React and fire in lower position
To the greatest extent, the overall flue-gas temperature on aditus laryngis and top is effectively improved, general temperature can form height more than 1000 DEG C in stove inner height direction
Temperature and broad SNCR work can fit space, and upper strata flue gas recirculation layer C flue gas recirculation is by the nozzle that slightly has a down dip, in stove
Several bursts of horizonally projected jets are created, improve mixing agitation and the residence time of flue gas；Meanwhile SNCR layers D SNCR injections are leaned in increase
Nearly upper flue gas recirculation layer C flue gas nozzle, can promote upper SNCR layers D SNCR to be carried by flue gas, more depth of advancing, make
SNCR covers broader stove inner section.
The effect of embodiment and effect
Flue gas recirculation denitrification apparatus in a kind of grate firing boiler of the present embodiment is because used lower flue gas recirculation layer energy
The air-flow mixing of enough effective lifting aditus laryngis, promotes the mixed heat transfer of aditus laryngis central high temperature flame and flue gas near wall, promotes larynx
CO and O in mouth and upper space2Mixing and after-flame, it is achieved that flue-gas temperature is integrally lifted.Because used upper cigarette
Gas circulation layer is arranged in grate furnace burner hearth, so improving residence time of the flow of flue gas in stove, while is cooperateed with increase
The accessible depth of SNCR layers injection advance, makes SNCR cover broader stove inner section.Therefore a kind of layer combustion of the present embodiment
Flue gas recirculation denitrification apparatus in boiler can realize that the flue-gas temperature of greater room in stove meets SNCR reaction temperature windows,
SNCR can also cover broader stove inner section, more effectively reduce NO in discharge flue gasxConcentration, ammonia solution emitted dose is reduced,
It also can be widely used to layer combustion chain-grate boiler, especially coal burning layered boiler, garbage burning boiler and the biomass of pluralities of fuel
Chain-grate boiler etc. and to realizing NOxDepth emission reduction plays an important role.
A kind of flue gas recirculation denitrification apparatus in the grate firing boiler of the present embodiment because used upper flue gas recirculation layer and
The amount of circulating gas of lower flue gas recirculation layer is low, so improving overall NOxEmission reduction efficiency.
Above-mentioned embodiment is the preferred case of the present invention, is not intended to limit protection scope of the present invention.
Claims (8)
1. the flue gas recirculation denitrification apparatus in a kind of grate firing boiler, be arranged on grate firing boiler burner hearth of the upper lateral part provided with perforate,
It is arranged on the grate firing boiler burner hearth interior bottom portion and fire grate, deduster, chimney, air-introduced machine and flue gas recirculation with air compartment
In the boiler of blower fan, it is characterised in that including：
Flue gas recirculation pipeline, including the first flue gas recirculation pipeline being connected in the perforate, with the first flue gas recirculation pipeline
Second flue gas recirculation pipeline of connection and the 3rd flue gas recirculation pipeline with the second flue gas recirculation pipeline communication；And
SNCR pipelines, there is the first branch and the second branch,
Wherein, the 3rd flue gas recirculation pipeline extends to the grate firing boiler burner hearth, by the grate firing boiler burner hearth inside points
For lower flue gas recirculation layer and upper flue gas recirculation layer,
The top extension of first branch flue gas recirculation layer on described, the top of the upper flue gas recirculation layer is divided to be formed
Upper SNCR layers,
Second branch extends on the top of the lower flue gas recirculation layer, and the top of the lower flue gas recirculation layer is divided to be formed
Lower SNCR layers.
2. the flue gas recirculation denitrification apparatus in grate firing boiler according to claim 1, it is characterised in that：
Wherein, the bottom of the lower flue gas recirculation layer is sequentially provided with the face arch being arranged on the grate firing boiler furnace wall from top to bottom
Aditus laryngis and rear arch aditus laryngis.
3. the flue gas recirculation denitrification apparatus in grate firing boiler according to claim 2, it is characterised in that：
Wherein, the both sides inside the grate firing boiler are provided with 4 positioned at the top of the face arch aditus laryngis or 3 lower floors
Flue gas recirculation nozzle, the nozzle are arranged on the grate firing boiler furnace wall and are inclined to the face arch aditus laryngis and the rear arch larynx downwards
Central horizontal position between mouthful.
4. the flue gas recirculation denitrification apparatus in grate firing boiler according to claim 1, it is characterised in that：
Wherein, flue gas on 4 on described in flue gas recirculation layer is provided with the front side inside the grate firing boiler to follow
Ring spray mouth, the nozzle are arranged on the grate firing boiler furnace wall.
5. the flue gas recirculation denitrification apparatus in grate firing boiler according to claim 1, it is characterised in that：
Wherein, 4 lower SNCR nozzles in the lower SNCR layers are provided with the front side inside the grate firing boiler, should
Nozzle is arranged on the grate firing boiler furnace wall.
6. the flue gas recirculation denitrification apparatus in grate firing boiler according to claim 1, it is characterised in that：
Wherein, SNCR nozzles on 4 on described in SNCR layers are provided with the front side inside the grate firing boiler,
SNCR nozzles on 2 in the upper SNCR layers are respectively arranged with both sides inside the grate firing boiler.
7. the flue gas recirculation denitrification apparatus in grate firing boiler according to claim 1, it is characterised in that：
Wherein, the internal diameter of the first flue gas recirculation pipeline is more than the internal diameter of the second flue gas recirculation pipeline, and second flue gas follows
The internal diameter in endless tube road is more than the internal diameter of the 3rd flue gas recirculation pipeline.
8. the flue gas recirculation denitrification apparatus in grate firing boiler according to claim 1, it is characterised in that：
Wherein, the amount of circulating gas of the lower flue gas recirculation layer and upper flue gas recirculation layer accounts for the 3%~8% of total exhaust gas volumn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711053175.9A CN107754587A (en) | 2017-11-01 | 2017-11-01 | A kind of flue gas recirculation denitrification apparatus in grate firing boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711053175.9A CN107754587A (en) | 2017-11-01 | 2017-11-01 | A kind of flue gas recirculation denitrification apparatus in grate firing boiler |
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| Publication Number | Publication Date |
|---|---|
| CN107754587A true CN107754587A (en) | 2018-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711053175.9A Pending CN107754587A (en) | 2017-11-01 | 2017-11-01 | A kind of flue gas recirculation denitrification apparatus in grate firing boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108905590A (en) * | 2018-08-13 | 2018-11-30 | 中国华能集团有限公司 | A kind of denitrating system and method for station boiler low NO collaboration high temperature spray ammonia |
| CN109654482A (en) * | 2018-12-18 | 2019-04-19 | 哈尔滨工业大学 | Using the Industrial Boiler of the SNCR and OFA interlaced arrangement of flue gas recirculation |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107213771A (en) * | 2017-07-14 | 2017-09-29 | 光大环境科技（中国）有限公司 | The biomass direct-fired device that flue gas recirculation and SNCR are combined |
| CN206526671U (en) * | 2017-01-25 | 2017-09-29 | 江门市同力环保科技有限公司 | A kind of SNCR denitration equipment of adjustable Burners Positions |
-
2017
- 2017-11-01 CN CN201711053175.9A patent/CN107754587A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206526671U (en) * | 2017-01-25 | 2017-09-29 | 江门市同力环保科技有限公司 | A kind of SNCR denitration equipment of adjustable Burners Positions |
| CN107213771A (en) * | 2017-07-14 | 2017-09-29 | 光大环境科技（中国）有限公司 | The biomass direct-fired device that flue gas recirculation and SNCR are combined |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108905590A (en) * | 2018-08-13 | 2018-11-30 | 中国华能集团有限公司 | A kind of denitrating system and method for station boiler low NO collaboration high temperature spray ammonia |
| CN108905590B (en) * | 2018-08-13 | 2023-05-12 | 中国华能集团有限公司 | Denitration system and method for low-nitrogen burner of power station boiler in cooperation with high-temperature ammonia injection |
| CN109654482A (en) * | 2018-12-18 | 2019-04-19 | 哈尔滨工业大学 | Using the Industrial Boiler of the SNCR and OFA interlaced arrangement of flue gas recirculation |
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Application publication date: 20180306 |