CN206526661U - A kind of waste heat boiler and Benitration reactor combined unit - Google Patents
A kind of waste heat boiler and Benitration reactor combined unit Download PDFInfo
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- CN206526661U CN206526661U CN201621273149.8U CN201621273149U CN206526661U CN 206526661 U CN206526661 U CN 206526661U CN 201621273149 U CN201621273149 U CN 201621273149U CN 206526661 U CN206526661 U CN 206526661U
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- flue
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model provides a kind of waste heat boiler and Benitration reactor combined unit, the combined unit includes flue, ammonia-gas spraying device, Benitration reactor, superheat section, evaporator section and economizer section, the flue includes the first vertical flue, horizontal flue, second vertical flue and bypass flue, top of the two ends of the horizontal flue respectively with the first vertical flue and the second vertical flue is connected, ammonia-gas spraying device and superheat section are arranged in the first vertical flue, Benitration reactor, evaporator section and economizer section are arranged in the second vertical flue, the bypass flue upper end is located between ammonia-gas spraying device and superheat section, the lower end of bypass flue is connected with high-temperature flue gas feed pipe and the first vertical flue lower end.The flue-gas temperature that device described in the utility model flows through Benitration reactor meets the optimal use temperature of denitrating catalyst, gives full play to catalyst performance, the problem of solving conventional ammonia-spraying grid influence denitration effect.
Description
Technical field
The utility model is related to flue gases purification field, and more particularly to a kind of waste heat boiler is combined with Benitration reactor
Device.
Background technology
Nitrogen oxides（NOx）It is one of primary pollution source of atmosphere pollution, what is contacted in occupational environment is several gases
Mixture is frequently referred to the smoke of gunpowder (gas), predominantly NO and NO2, with NO2Based on.NOxAll there is different degrees of toxicity, with NO and NO2
Based on NOxIt is the major reason to form photochemical fog and acid rain.NO in vehicle exhaustxWith hydrocarbon through purple
The react toxic smog to be formed, referred to as photochemical fog are irradiated in outside line.Photochemical fog has special odor, stimulates eye
Eyeball, injures plant, and can reduce atmospheric visibility.In addition, NOxNitric acid and nitrous acid with the water reaction generation in air are
The composition of acid rain.NOxHarm to human body is mainly manifested in infringement respiratory tract.
The whole world is discharged into the NO of air every yearxAbout 50,000,000 tons of total amount, China NO in 2008xDischarge capacity has reached 2000
Ten thousand tons, as the big discharge state of the first in the world.If taking no action to control, it is contemplated that to the year two thousand twenty, NOxDischarge capacity is up to 30,000,000
Ton, China the Eleventh Five-Year Plan period cuts down the effort of sulfur dioxide 10%, also will be because of NOxThe notable rising of discharge capacity and all offset.
At present, China is by NOx" 12 " period overall control category is included as the binding indicator.It is discharged into the NO in airxIt is main
There are three sources：Power plant（Account for 46%）, vehicle exhaust（Account for 49%）With oil-refining chemical factory（Account for 5%）.
In FCC techniques, catalyst granules multiple circulate operation between catalytic cracking reaction zone and catalyst regeneration zones,
During regeneration, the coke from cracking reaction on catalyst granules is removed by air oxidation at high temperature, makes catalyst
Activity recovery, and reused in cracking reaction.NO in FCC flue gasesxThe burning of nitrogenous coke on catalyst, because
The FCC apparatus of this all processing nitrogen-containing material can all have NOxEmission problem.NO in FCC flue gasesxAmount typically constitutes from full factory NOx
The 50% of discharge capacity, is the maximum NO of oil plantxEmission source.Nitrogen content is general in 0.05%~0.35%, raw material nitrogen in FCC feedstock
Middle about 45% enters fluid product, and about 10% enters gas products, and remaining enters in coke.Nitrogen in coke there are about 10%~30% work
Enter flue gas for NO, remaining is then reduced to N by coke and CO2Discharge.
Current gas denitrifying technology mainly has：The SCR methods of gas phase reaction（Selective catalytic reduction）With SNCR methods（Selection
Property noncatalytic reduction）, liquid absorption method, solid absorption method, high energy electron active oxidation method etc..
CN200910104626.6 describes a kind of SCR denitration technique using non-equal diameter spray orifice ammonia-spraying grid and denitration
Device, by using the ammonia-spraying grid of non-equal diameter spray orifice, the diameter in each spray ammonia hole is gradually reduced with ammonia flow direction, so that
Ensure during spray ammonia, the ammonia amount in each spray ammonia hole keeps identical, it is ensured that denitration effect.The structure is disadvantageous in that,
The mixed gas of ammonia and compressed air is directly mixed with flue gas, is greatly reduced the temperature of flue gas, is caused denitrating catalyst
It can not play one's part to the full, have a strong impact on denitration effect.
CN200920045181.4 describes a kind of ejection ammonia mixing arrangement of SCR reaction units, several by setting
Only retaining the method for a small amount of nozzle in distribution pipe, every distribution pipe makes ammonia amount in each nozzle keep identical, then passes through nozzle
The mixed effect of the static mixing blade of lower section, enhancing ammonia and flue gas.The structure is disadvantageous in that ammonia and compression are empty
The mixed gas of gas is directly mixed with flue gas, causes ammonia to be reacted with the sulphur in flue gas, the sulphur ammonium meeting plug nozzle of generation,
Influence the long period continuous and steady operation of denitrification apparatus.
Utility model content
In view of the shortcomings of the prior art, the present invention provides a kind of waste heat boiler and Benitration reactor combined unit, it is intended to solve
Prior art, due to too low air temperature, causes flue-gas temperature drastically to decline during spray ammonia, and then influences denitrating catalyst
Effect, and ammonia react with the sulphur in flue gas, the problem of the sulphur ammonium plug nozzle of generation.
The utility model provides a kind of waste heat boiler and Benitration reactor combined unit, and the combined unit includes cigarette
Road, ammonia-gas spraying device, Benitration reactor, superheat section, evaporator section and economizer section, the flue include the first vertical flue, level
Flue, the second vertical flue and bypass flue, the two ends of the horizontal flue respectively with the first vertical flue and the second vertical cigarette
The top connection in road, ammonia-gas spraying device and superheat section are arranged in the first vertical flue, Benitration reactor, evaporator section and economizer section
It is arranged in the second vertical flue, the bypass flue upper end is located between ammonia-gas spraying device and superheat section, the lower end of bypass flue
Connected with high-temperature flue gas feed pipe and the first vertical flue lower end.
In combined unit described in the utility model, the bypass flue be arranged in parallel with the first vertical flue, the side
The upper end of road flue is connected by elbow with the first vertical flue, and is not stretched into the first vertical flue, is set and is led in elbow
Plate is flowed, laminar flow state stably is provided for ammonia-gas spraying device, it is ensured that being sufficiently mixed for ammonia and flue gas, the escaping of ammonia is prevented.
In combined unit described in the utility model, bottom is provided with choke valve in the bypass flue, to adjust entrance
The exhaust gas volumn of bypass flue.
In combined unit described in the utility model, set between the ammonia-gas spraying device and superheat section in the first vertical flue
Deflection plate is equipped with, stable laminar flow state is provided for ammonia-gas spraying device, it is ensured that being sufficiently mixed for ammonia and flue gas, the escaping of ammonia is prevented.
In combined unit described in the utility model, described ammonia-gas spraying device can use well known to those skilled in the art
Structure, for example, can use ammonia-spraying grid.In order to avoid flue-gas temperature drastically declines, and then denitrating catalyst effect is influenceed, with
And generation sulphur ammonium plug nozzle the problem of, recommend using following structure ammonia-gas spraying device.
In combined unit described in the utility model, the ammonia-gas spraying device is arranged in flue, including spray ammonia pipe, nozzle and
Economizer bank, the spray ammonia pipe two ends are closed by closure plate, and several nozzles, the economizer bank and spray ammonia pipe are provided with spray ammonia pipe
Middle part is connected, and some fins are both provided with every layer of economizer bank.The utility model has in the ammonia-gas spraying device of preheating function, institute
Economizer bank is stated with being connected in the middle part of spray ammonia pipe, it is ensured that the ammonia spraying amount of each nozzle location is uniform.
In combined unit described in the utility model, described economizer bank can arrange 1 ~ 6 layer along snakelike arrangement, preferably 3 or
4 layers.
, can be with interlaced arrangement between the adjacent two layers economizer bank in combined unit described in the utility model, can also
It is arranged vertically.
In combined unit described in the utility model, the economizer bank and the position relationship for spraying ammonia pipe are true by flue gas flow direction
It is fixed, make economizer bank preferentially and smoke contacts.
In combined unit described in the utility model, the Benitration reactor and waste heat boiler formation integral structure,
Several beds are set in Benitration reactor, and each beds include steam sootblower, urged successively from top to bottom
Agent module and catalyst support beam, two neighboring catalyst bed interlayer leave enough installation and repairing spaces.
Compared with prior art, waste heat boiler described in the utility model has following excellent with Benitration reactor combined unit
Point：
1st, waste heat boiler and Benitration reactor combined unit described in the utility model, by setting bypass flue by one
Divide without by taking the high-temperature flue gas of heat to be directly accessed in flue, with taking the flue gas of heat to mix by superheater, improve and flow through
The flue-gas temperature of ammonia-gas spraying device, due to too low air temperature during spray ammonia, causes flue-gas temperature to decline, still can be with
The flue-gas temperature for flowing through Benitration reactor meets the optimal use temperature of denitrating catalyst, gives full play to catalyst performance, solution
The problem of conventional ammonia-spraying grid of having determined influences denitration effect.
2nd, the waste heat boiler and Benitration reactor combined unit described in the utility model, using the spray with preheating function
The mixed gas of ammonia device, ammonia and air is exchanged heat by undermost economizer bank with flue gas, due to heat transfer process be
Preheat what pipe surface was carried out, although now there is low-temperature space, ammonia is not contacted actually with the sulphur in flue gas, therefore will not be produced
Raw sulphur ammonium, it is to avoid the problem of spray nozzle clogging, is conducive to the long period continuous and steady operation of ammonia-gas spraying device, is adapted to popularization and application.
3rd, waste heat boiler and Benitration reactor combined unit described in the utility model, by waste heat boiler of the prior art and
Benitration reactor is integrated into a combined unit to realize the function of the two, but the two is not the Jia Heguan in simple meaning
System, but have certain facilitation to each other.In described in the utility model, Benitration reactor and waste heat boiler are arranged to connection
Attach together and put, the temperature field that heat is formed is taken by waste heat boiler, Benitration reactor is set in the suitable SCR temperature spots reacted, by
Neither absorbed heat nor heat release in SCR reactions, can be in the case where not influenceing to recycle exhaust-heat boiler flue gas waste heat, preferably
Fume afterheat is make use of, heating efficiency is improved, investment is reduced.
4th, waste heat boiler and Benitration reactor combined unit described in the utility model, in the elbow of bypass flue and first
Deflector and deflection plate are set respectively in vertical flue, pass through the synergy of the two so that flow through the flue gas of ammonia-gas spraying device according to
So keep stable laminar flow state, it is to avoid shadow is caused to the flue gas fluidised form in the first vertical flue because bypass flue is set
Ring, it is ensured that flue gas being uniformly distributed in whole cross section, be easy to being sufficiently mixed for ammonia and flue gas, prevent the escaping of ammonia.
Brief description of the drawings
Fig. 1 is waste heat boiler described in the utility model and Benitration reactor combined unit structural representation.
Fig. 2 is ammonia-gas spraying device structural representation described in the utility model.
Fig. 3 is ammonia-gas spraying device side view described in the utility model.
Embodiment
Embodiment of the present utility model is described in further detail with reference to the accompanying drawings and examples.Following reality
Applying example is used to illustrate the utility model, but is not limited to scope of the present utility model.
, it is necessary to explanation, term " on ", " under ", " interior ", " outer ", " top ", " bottom " in description of the present utility model
Orientation or position relationship Deng instruction are, based on orientation shown in the drawings or position relationship, to be for only for ease of and describe this practicality newly
Type and simplified description, rather than instruction or the signified device of hint or element must be with specific orientation, with specific orientation
Construction and operation, therefore it is not intended that to limitation of the present utility model.In addition, term " first ", " second " are only used for description
Purpose, and it is not intended that indicating or implying relative importance.
, it is necessary to which explanation, unless otherwise clearly defined and limited, term " is set in description of the present utility model
Have ", " being placed in ", " connected ", " connection ", " installation " etc. should be interpreted broadly, for example, it may be being fixedly connected or can
Dismounting connection, or be integrally connected；Can be mechanical connection or electrical connection；Can be joined directly together, can also pass through
Intermediary is indirectly connected to, and can be the connection of two element internals.For the ordinary skill in the art, can have
Body situation understands concrete meaning of the above-mentioned term in the utility model.
As described in Figure 1, combined unit of the present invention includes flue, ammonia-gas spraying device, Benitration reactor, superheat section, evaporation
Section and economizer section, the flue include the first vertical flue 1, horizontal flue 2, the second vertical flue 3 and bypass flue 4, institute
State top of the two ends of horizontal flue 2 respectively with the first vertical flue 3 of vertical flue 1 and second to connect, ammonia-gas spraying device 3 and overheat
Section 7 is arranged in the first vertical flue, and ammonia-gas spraying device 3 is located at the spray in the top of superheat section 7, the first vertical flue 1
Deflection plate 403 is provided between ammonia device 5 and superheat section 7, Benitration reactor 6, evaporator section 8 and economizer section 9 are arranged at second
In vertical flue 3, according to the engagement sequence with flue gas, from top to bottom set gradually in the second vertical flue 3 Benitration reactor 6,
Evaporator section 8 and economizer section 9.The bypass flue 4 is be arranged in parallel with the first vertical flue 1, and bottom is set in the bypass flue 4
Have choke valve 401, the upper end of the bypass flue 4 is connected by elbow with the first vertical flue 1, the bypass flue 4 it is upper
End is located between ammonia-gas spraying device and superheat section, and does not stretch into the first vertical flue 1, and deflector 402, bypass are set in elbow
The lower end of flue 4 is connected with high-temperature flue gas feed pipe and the first vertical lower end of flue 1.It is provided with Benitration reactor 6 some
Two beds are only set in individual beds, Fig. 1, and each beds are sequentially provided with steam soot blowing from top to bottom
Device 601, catalyst module 602 and catalyst support beam 603.
As shown in Figure 1, combined unit described in the utility model is when in use, interim by what is set in Benitration reactor 6
Hanger rail and dolly, Benitration reactor is hung in by catalyst module 602, and is placed on catalyst support beam 603, completes catalyst
The installation of module.Part of smoke enters waste heat boiler from the first vertical lower end of flue 1 first, carries out taking heat by superheat section 7,
Another part flue gas enters the first vertical flue 1 from bypass flue 4, and this two parts flue gas is in deflector 402 and deflection plate 403
Mixing and rectification are completed under synergy, is then mixed by ammonia-gas spraying device 5 with the ammonia sprayed into.Mixed flue gas temperature
Degree enters Benitration reactor 6 at 350 DEG C or so, by the vertical flue 3 of horizontal flue 2 and second and carries out reduction reaction removing NOx；
Flue gas after denitration process enters evaporator section 8 and economizer section 9 continues to take heat, completes after net quantity of heat removal process, can be straight
Row's air enters desulfurizer.When dust content increases in flue gas, during blocking catalyst duct, start steam sootblower 601
Carry out soot blowing.
As shown in Fig. 2 and Fig. 3, in combined unit described in the utility model, the ammonia-gas spraying device includes nozzle 501, sprays ammonia
Pipe 502, closure plate 503, economizer bank 504 and fin 505.Some nozzles 501 are provided with spray ammonia pipe 502, every sprays ammonia pipe 502
Middle part is connected with economizer bank 504, and two ends are closed by closure plate 503.Economizer bank 504 is located at the bottom of spray ammonia pipe 502, using four layers of friendship
Mistake arrangement, is both provided with some fins 505 outside every layer of economizer bank 504.
As shown in Fig. 2 and Fig. 3, when in use, high-temperature flue gas flows through orlop to ammonia-gas spraying device described in combined unit of the present invention
During economizer bank 5, the ammonia and the mixed gas of air in pipe are heated, economizer bank 5 is arranged along whole flue cross section, can be with
Make full use of the temperature of flue gas everywhere.Because heat transfer process is carried out in preheating pipe surface, although now there is low-temperature space,
Ammonia is not contacted actually with the sulphur in flue gas, therefore will not produce sulphur ammonium, it is to avoid the problem of spray nozzle clogging, is conducive to spraying ammonia
The long period continuous and steady operation of device.
Claims (11)
1. a kind of waste heat boiler and Benitration reactor combined unit, the combined unit include flue, ammonia-gas spraying device, denitration reaction
Device, superheat section, evaporator section and economizer section, the flue include the first vertical flue, horizontal flue, the second vertical flue and side
Road flue, the top of the two ends of the horizontal flue respectively with the first vertical flue and the second vertical flue is connected, ammonia-gas spraying device
It is arranged at superheat section in the first vertical flue, Benitration reactor, evaporator section and economizer section are arranged in the second vertical flue,
The bypass flue upper end is located between ammonia-gas spraying device and superheat section, lower end and high-temperature flue gas feed pipe and first of bypass flue
Vertical flue lower end connection.
2. according to the combined unit described in claim 1, it is characterised in that：The bypass flue is parallel with the first vertical flue to be set
Put, the upper end of the bypass flue is connected by elbow with the first vertical flue, and is not stretched into the first vertical flue.
3. according to the combined unit described in claim 2, it is characterised in that：Deflector is set in the elbow.
4. according to the combined unit described in claim 1, it is characterised in that：Bottom is provided with choke valve in the bypass flue.
5. according to the combined unit described in claim 1, it is characterised in that：Ammonia-gas spraying device and mistake in the first vertical flue
Deflection plate is provided between hot arc.
6. according to the combined unit described in claim 1, it is characterised in that：According to the engagement sequence with flue gas, the second vertical cigarette
Benitration reactor, evaporator section and economizer section are from top to bottom set gradually in road.
7. according to the combined unit described in claim 1, it is characterised in that：Ammonia-gas spraying device was located in the first vertical flue
The top of hot arc.
8. according to the combined unit described in claim 1, it is characterised in that：The ammonia-gas spraying device includes spray ammonia pipe, nozzle and pre-
Heat pipe, the spray ammonia pipe two ends are closed by closure plate, several nozzles are provided with spray ammonia pipe, the economizer bank is with spraying in ammonia pipe
Portion is connected, and some fins are both provided with every layer of economizer bank.
9. according to the combined unit described in claim 8, it is characterised in that：Described economizer bank arranges 1 ~ 6 along snakelike arrangement
Layer.
10. according to the combined unit described in claim 9, it is characterised in that：Described economizer bank arranges 3 or 4 layers.
11. according to the combined unit described in claim 10, it is characterised in that：Interlaced arrangement between the adjacent two layers economizer bank
Or be arranged vertically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621273149.8U CN206526661U (en) | 2016-11-25 | 2016-11-25 | A kind of waste heat boiler and Benitration reactor combined unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621273149.8U CN206526661U (en) | 2016-11-25 | 2016-11-25 | A kind of waste heat boiler and Benitration reactor combined unit |
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| Publication Number | Publication Date |
|---|---|
| CN206526661U true CN206526661U (en) | 2017-09-29 |
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ID=59921540
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621273149.8U Active CN206526661U (en) | 2016-11-25 | 2016-11-25 | A kind of waste heat boiler and Benitration reactor combined unit |
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| CN (1) | CN206526661U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107890776A (en) * | 2017-12-22 | 2018-04-10 | 中冶焦耐(大连)工程技术有限公司 | A kind of middle low-temperature flue gas de-dusting de-nitration integrated and method |
| CN113623665A (en) * | 2020-05-06 | 2021-11-09 | 洛阳瑞昌环境工程有限公司 | System and method for incinerating waste gas and waste liquid of ethylene glycol device |
-
2016
- 2016-11-25 CN CN201621273149.8U patent/CN206526661U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107890776A (en) * | 2017-12-22 | 2018-04-10 | 中冶焦耐(大连)工程技术有限公司 | A kind of middle low-temperature flue gas de-dusting de-nitration integrated and method |
| CN113623665A (en) * | 2020-05-06 | 2021-11-09 | 洛阳瑞昌环境工程有限公司 | System and method for incinerating waste gas and waste liquid of ethylene glycol device |
| CN113623665B (en) * | 2020-05-06 | 2023-08-01 | 洛阳瑞昌环境工程有限公司 | System and method for incinerating waste gas and waste liquid of ethylene glycol device |
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