CN207430010U - A kind of SCR denitration system of two-stage reactor series connection - Google Patents
A kind of SCR denitration system of two-stage reactor series connection Download PDFInfo
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- CN207430010U CN207430010U CN201721200026.6U CN201721200026U CN207430010U CN 207430010 U CN207430010 U CN 207430010U CN 201721200026 U CN201721200026 U CN 201721200026U CN 207430010 U CN207430010 U CN 207430010U
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Abstract
The utility model is related to a kind of SCR denitration systems of two-stage reactor series connection, it is characterised in that：Including boiler, economizer, level-one spray ammonia mixing arrangement, reductant supply system, level-one Benitration reactor, two level spray ammonia mixing arrangement, two level Benitration reactor and air preheater, the outlet of boiler is connected with flue, economizer, level-one spray ammonia mixing arrangement, level-one Benitration reactor, two level spray ammonia mixing arrangement, two level Benitration reactor and air preheater are successively set on along flow of flue gas direction in flue, reductant supply system is connected with level-one spray ammonia mixing arrangement, and reductant supply system is connected with two level spray ammonia mixing arrangement.The utility model has many advantages, such as that denitration efficiency height, simple system, operating cost are low, reducing agent utilization rate is high, is with a wide range of applications.
Description
Technical field
The utility model belongs to industrial waste gas purifying environmental protection and energy field, more particularly to a kind of two-stage reactor series connection
SCR denitration system.
Background technology
Energy resource structure of the China based on coal will not change within the long duration, therefore, control coal-fired flue-gas pollutant
Discharge is an important process of China's control atmosphere pollution.Most widely used current coal-fired plant flue gas denitration is selectivity
Catalysis reduction（SCR）Technology, the technology have the advantages that it is ripe, stable, economical, but its denitration efficiency be subject to the escaping of ammonia control refer to
Target limits, and is typically designed no more than 90%.And under the conditions of high-efficiency operation, it is equal that the escaping of ammonia Con trolling index is limited to flow field again
Even property, flow field uniformity have become the key technical problem of current SCR denitration.On the other hand, current coal-burning power plant of China is comprehensive
Promote minimum discharge work, it is desirable that NOx emission concentration is less than 50mg/m3, for partly using meager coal, anthracitic unit, pot
Stove NOxConcentration is generated often beyond 500mg/m3, that is, denitration efficiency is required to be more than 90%, how to break through traditional SCR technology at this time
Efficiency bottle neck realizes that SCR denitration is efficient, stablizes, economical operation, becomes the important research of current coal-fired flue gas denitration technical field
Direction.
With the relevant patent of the utility model, such as CN103691293B ---《A kind of SNCR and SCR mixing denitrating systems》,
It is that existing SNCR and SCR denitration system are improved and combined, the ammonia after SNCR reactions is traveled further into SCR reactors
Denitration reaction is carried out, and is automatically controlled by automation control module realization.But the method is applied to large coal-fired boiler, is limited
In SNCR denitration is inefficient, reducing agent consumption is big, amount of ammonia slip can not be controlled effectively the problems such as, denitration efficiency and economical operation
Property is poor.
For another example CN105771646A ---《A kind of two-compartment reactor for SCR denitration》, it is by the way that two denitrations are anti-
Device is answered to be arranged in juxtaposition, to solve the problems, such as that denitration plate vertical space is insufficient.But due to only once spraying ammonia, only rely on reactor
Between deflector is set, still the flow field in Benitration reactor can not fully be optimized, therefore its denitration efficiency can not still dash forward
Broken conventional scr denitration technology bottleneck.And such U-shaped arrangement easily leads to and fouling phenomenon occurs in reactor bottom.
Utility model content
The purpose of the utility model is to overcome above-mentioned deficiency in the prior art, and a kind of structure design is provided and is closed
Reason, meets coal-fired flue-gas NOxHigh denitration efficiency required by minimum discharge is connected with the two-stage reactor of low operating cost target
SCR denitration system.
The technical scheme in the invention for solving the above technical problem is：A kind of SCR denitration of two-stage reactor series connection
System, it is characterised in that：Including boiler, economizer, level-one spray ammonia mixing arrangement, reductant supply system, level-one denitration reaction
Device, two level spray ammonia mixing arrangement, two level Benitration reactor and air preheater, the outlet of boiler are connected with flue, economizer, level-one spray
Ammonia mixing arrangement, level-one Benitration reactor, two level spray ammonia mixing arrangement, two level Benitration reactor and air preheater along flow of flue gas side
To being successively set in flue, reductant supply system is connected with level-one spray ammonia mixing arrangement, reductant supply system and two level
Spray ammonia mixing arrangement is connected.
The utility model further includes reactor inlet ash bucket, and reactor inlet ash bucket is arranged under level-one Benitration reactor
Side.
Level-one Benitration reactor described in the utility model, two level spray ammonia mixing arrangement and two level Benitration reactor, which are formed, falls U
Type structure, level-one Benitration reactor and two level Benitration reactor are separately positioned on the both sides of inverted U-shaped structure.
Two level spray ammonia mixing arrangement described in the utility model is provided with mixer.
A kind of method of work of the SCR denitration system of two-stage reactor series connection, it is characterised in that：Flue gas comes out from boiler
Afterwards, economizer is initially entered, economizer is then departed from and level-one is gone to spray ammonia mixing arrangement, dress is mixed with level-one spray ammonia in flue
The ammonia mixing of ejection is put, level-one Benitration reactor is entered back into, two level is gone to spray ammonia mixing arrangement after level-one denitration reaction,
The ammonia sprayed into two level spray ammonia mixing arrangement in flue mixes, and it is anti-then to enter back into the progress two level denitration of two level Benitration reactor
Should, the flue gas after two level denitration reaction enters back into air preheater.Ammonia spraying amount can be adjusted according to the denitration efficiency of setting, be taken off
Nitre efficiency can be by monitoring level-one Benitration reactor import and export NOxConcentration and two level Benitration reactor outlet NOxConcentration and NH3Escape
Ease concentration is controlled.
The utility model flue gas enters tail flue gas processing unit after leaving air preheater.
The ammonia of level-one spray ammonia mixing arrangement described in the utility model and two level spray ammonia mixing arrangement is supplied by reducing agent
System provides.
Reactor inlet ash bucket described in the utility model is used to collect the bulky grain flying dust in flue gas.
For flue gas described in the utility model from the bottom up into level-one Benitration reactor, flue gas enters two level denitration from top to bottom
Reactor.
The utility model is by monitoring the NO of the import and export of level-one Benitration reactorxConcentration and two level Benitration reactor
Outlet NOxConcentration and NH3The ammonia spraying amount for the concentration, adjusting level-one spray ammonia mixing arrangement and two level spray ammonia mixing arrangement of escaping, control
The denitration efficiency of level-one Benitration reactor processed controls the denitration efficiency of two level Benitration reactor in 50-70% in 70-90%；Denitration
Catalyst pattern, volume and the number of plies can be adjusted according to flue gas condition and performance requirement and determined, in level-one Benitration reactor
Level-one denitrating catalyst preferentially selects flat catalyst.
The utility model passes through change compared with prior art, it can be achieved that the breakthrough of conventional scr denitration technology denitration efficiency
Flue gas flow direction and setting reactor inlet ash bucket, can effectively remove the bulky grain flying dust in flue gas, traditional SCR is effectively avoided to take off
The common dust stratification of nitre technology, wear problem.Compared with prior art, the utility model has denitration efficiency height, simple system, operation
The advantages that expense is low, reducing agent utilization rate is high, is with a wide range of applications.
Description of the drawings
Fig. 1 is the main structure diagram of the utility model embodiment.
Specific embodiment
Below in conjunction with the accompanying drawings and pass through embodiment the utility model is described in further detail, following embodiment is pair
The explanation of the utility model and the utility model is not limited to following embodiment.
Embodiment.
Referring to Fig. 1.
The present embodiment be a kind of two-stage reactor series connection SCR denitration system, including reactor inlet ash bucket 6, boiler 1,
Economizer 2, level-one spray ammonia mixing arrangement 3, reductant supply system 4, level-one Benitration reactor 5, two level spray ammonia mixing arrangement 7,
Two level Benitration reactor 8 and air preheater 9.The outlet of boiler 1 is connected with flue, economizer 2, level-one spray ammonia mixing arrangement 3, level-one
Benitration reactor 5, two level spray ammonia mixing arrangement 7, two level Benitration reactor 8 and air preheater 9 are set gradually along flow of flue gas direction
In flue, reductant supply system 4 is connected with level-one spray ammonia mixing arrangement 3, and reductant supply system 4 is mixed with two level spray ammonia
Device 7 is connected, and reactor inlet ash bucket 6 is arranged on the lower section of level-one Benitration reactor 5.
Level-one spray ammonia mixing arrangement 3 and two level spray ammonia mixing arrangement 7 can realize SCR denitration classification spray ammonia mixing, effectively carry
Height spray ammonia uniformity index.Level-one spray ammonia mixing arrangement 3 sprays the ammonia of ammonia mixing arrangement 7 by reductant supply system with two level
4 provide.
Two level spray ammonia mixing arrangement 7 preferentially sets mixer.
Preferably, level-one Benitration reactor 5, two level spray ammonia mixing arrangement 7 and two level Benitration reactor 8 form inverted U
Structure, level-one Benitration reactor 5 and two level Benitration reactor 8 are separately positioned on the both sides of inverted U-shaped structure.Flue gas from the bottom up into
Enter level-one Benitration reactor 5, flue gas enters two level Benitration reactor 8 from top to bottom.Inverted U-shaped structure is set vertically perpendicular to ground
It puts.
Since level-one Benitration reactor 5 need not strictly control ammonia slip concentration, setting denitration efficiency can reach 70-90%, and two
Grade Benitration reactor 8 is mainly used for carrying out NOxThe elimination of further deep removal and the escaping of ammonia, denitration efficiency can be controlled in 50-
70%.Denitrating catalyst pattern, volume and the number of plies can be adjusted according to flue gas condition and performance requirement and determined, wherein level-one takes off
Level-one denitrating catalyst in nitre reactor preferentially selects flat catalyst.
Since 5 flue gas flow direction of level-one Benitration reactor is from the bottom up, level-one denitrating catalyst is to the bulky grain in flue gas
Flying dust has natural interception function, while also avoids deposition of the bulky grain flying dust in catalyst surface.Therefore level-one denitration
The reactor inlet ash bucket 6 of 5 lower section of reactor plays an important role of to collect the bulky grain flying dust in flue gas.
The present embodiment additionally provides the method for work of the SCR denitration system of two-stage reactor series connection, is as follows：
Flue gas initially enters economizer 2 after boiler 1 comes out, and is then departed from economizer 2 and level-one is gone to spray ammonia mixing arrangement
3, the ammonia sprayed in flue with level-one spray ammonia mixing arrangement 3 mixes, and enters back into level-one Benitration reactor 5, is taken off by level-one
Two level spray ammonia mixing arrangement 7 is gone to after nitre reaction, the ammonia sprayed into two level spray ammonia mixing arrangement 7 in flue mixes, Ran Houzai
Two level denitration reaction is carried out into two level Benitration reactor 8, the flue gas after two level denitration reaction enters back into air preheater 9, cigarette
Gas enters tail flue gas processing unit after leaving air preheater 9.
Additional, the NO of the import by monitoring level-one Benitration reactor 5xThe outlet of concentration, level-one Benitration reactor 5
NOxThe NO of the outlet of concentration and two level Benitration reactor 8xConcentration and the NH of the outlet of two level Benitration reactor 83It escapes dense
Degree adjusts the ammonia spraying amount of level-one spray ammonia mixing arrangement 3 and two level spray ammonia mixing arrangement 7, the denitration of control level-one Benitration reactor 5
Efficiency is in 70-90%, and the denitration efficiency of control two level Benitration reactor 8 is in 50-70%.
Denitrating catalyst pattern, volume and the number of plies can be adjusted according to flue gas condition and performance requirement and determined.
Preferably, the level-one denitrating catalyst in level-one Benitration reactor 5 selects flat catalyst.
The present embodiment is by by the organic series connection of two-stage Benitration reactor, not only independently of each other, but also mutually collaboration, tradition can be broken through
SCR denitration technology denitration efficiency bottleneck realizes NOxEfficient removal, and by changing flue gas flow direction and setting reactor inlet ash
Bucket, can effectively remove the bulky grain flying dust in flue gas, dust stratification, the wear problem for effectively avoiding traditional SCR denitration technology common.
Compared with prior art, the present embodiment has many advantages, such as that denitration efficiency height, simple system, operating cost are low, reducing agent utilization rate is high,
It is with a wide range of applications.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of parts and components is named
Title etc. can be different, and the above content described in this specification is only to the utility model structure example explanation.
The equivalence changes or simple change that all construction, feature and principles according to described in the utility model patent concept are done, are wrapped
It includes in the protection domain of the utility model patent.Those skilled in the art of the present invention can be to described
Specific embodiment does various modifications or additions or substitutes in a similar way, without departing from the knot of the utility model
Structure surmounts scope defined in the claims, all should belong to the protection range of the utility model.
Claims (6)
1. a kind of SCR denitration system of two-stage reactor series connection, it is characterised in that：Including boiler, economizer, level-one spray ammonia mixing
Device, reductant supply system, level-one Benitration reactor, two level spray ammonia mixing arrangement, two level Benitration reactor and air preheater, pot
The outlet of stove is connected with flue, economizer, level-one spray ammonia mixing arrangement, level-one Benitration reactor, two level spray ammonia mixing arrangement, two
Grade Benitration reactor and air preheater are successively set on along flow of flue gas direction in flue, and reductant supply system is mixed with level-one spray ammonia
It attaches together and puts connected, reductant supply system and two level spray ammonia mixing arrangement are connected.
2. the SCR denitration system of two-stage reactor series connection according to claim 1, it is characterised in that：Further include reactor
Entrance ash bucket, reactor inlet ash bucket are arranged on the lower section of level-one Benitration reactor.
3. the SCR denitration system of two-stage reactor series connection according to claim 1 or 2, it is characterised in that：The level-one takes off
Nitre reactor, two level spray ammonia mixing arrangement and two level Benitration reactor form inverted U-shaped structure, and level-one Benitration reactor and two level take off
Nitre reactor is separately positioned on the both sides of inverted U-shaped structure.
4. the SCR denitration system of two-stage reactor series connection according to claim 3, it is characterised in that：The two level sprays ammonia
Mixing arrangement is provided with mixer.
5. the SCR denitration system of two-stage reactor series connection according to claim 4, it is characterised in that：The reactor enters
Mouth ash bucket is used to collect the flying dust in flue gas.
6. the SCR denitration system of two-stage reactor series connection according to claim 3, it is characterised in that：Level-one denitration reaction
Level-one denitrating catalyst in device selects flat catalyst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721200026.6U CN207430010U (en) | 2017-09-19 | 2017-09-19 | A kind of SCR denitration system of two-stage reactor series connection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721200026.6U CN207430010U (en) | 2017-09-19 | 2017-09-19 | A kind of SCR denitration system of two-stage reactor series connection |
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| CN207430010U true CN207430010U (en) | 2018-06-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107694305A (en) * | 2017-09-19 | 2018-02-16 | 华电电力科学研究院 | A kind of SCR denitration system and its method of work of two-stage reactor series connection |
| CN109092035A (en) * | 2018-08-31 | 2018-12-28 | 华电电力科学研究院有限公司 | A kind of device and its working method for adjusting denitration spray ammonia flow adding feedforward based on cascade PID |
-
2017
- 2017-09-19 CN CN201721200026.6U patent/CN207430010U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107694305A (en) * | 2017-09-19 | 2018-02-16 | 华电电力科学研究院 | A kind of SCR denitration system and its method of work of two-stage reactor series connection |
| CN109092035A (en) * | 2018-08-31 | 2018-12-28 | 华电电力科学研究院有限公司 | A kind of device and its working method for adjusting denitration spray ammonia flow adding feedforward based on cascade PID |
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