CN101664615A - Flue gas pre-dedusting device used for SCR denitration system - Google Patents
Flue gas pre-dedusting device used for SCR denitration system Download PDFInfo
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- CN101664615A CN101664615A CN200910190803A CN200910190803A CN101664615A CN 101664615 A CN101664615 A CN 101664615A CN 200910190803 A CN200910190803 A CN 200910190803A CN 200910190803 A CN200910190803 A CN 200910190803A CN 101664615 A CN101664615 A CN 101664615A
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- flue gas
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Abstract
The invention discloses a flue gas pre-dedusting device used for an SCR denitration system, which comprises a flue used for transporting flue gas to an SCR reactor; a columnar dust chamber is arranedon the flue and provided with a dedusting flue gas inlet channel and a dedusting flue gas outlet channel which are communicated with the flue; the dedusting flue gas inlet channel is communicated withthe dust chamber along the tangential direction; the dedusting flue gas outlet channel extends into the dust chamber, and a flue gas outlet port of the dedusting flue gas outlet channel is positionedat the middle part of the dedusting chamber; when in use, the high-temperature flue gas enters the dust chamber along the tangential direction of the side wall of the dust chamber; cyclostrophic flowis generated under the guidance effect of an annular channel formed by the columnar side wall of the dust chamber and the side wall of a flue gas inlet; dust particles do circular movement along withthe flow; under the action of centrifugal force, dust moves towards the side wall of the dust chamber and falls down under the action of gravity, therefore, the dust in the dust chamber mainly closesto the periphery of the side wall intensively; and a flue gas outlet is arranged at the middle part of the dust chamber and introduces the purified flue gas into the SCR reactor, thus achiving good dedusting effect.
Description
Technical field
The present invention relates to power plant exhaust-gas treatment field, particularly a kind of flue gas pre-dedusting device that is used for the SCR denitrating system.
Background technology
Nitrogen oxide is as one of main atmosphere pollution, received increasing concern, it will become, and country pollutes the another major fields of control after sulfide, estimation according to relevant research, in the near future, the total emission volumn of NOx will surpass SOx, become the first acid pollution gas of power industry discharging, SCR (selective catalyst reactive) gas denitrifying technology is one of gas denitrifying technology that is most widely used at present, possesses advantages such as denitration efficiency height, selectivity are good, stable and reliable operation.
The operation principle of SCR denitrating system is: under 280-420 ℃ of temperature conditions, the reduction reaction takes place in the reducing agent NH3 that sprays in NOx in the flue gas and the upstream flue under catalyst action, generate N2 and H2O etc.; Because the high grey characteristic of the ature of coal of China, exhaust gas dust concentration is higher, and contained flying dust easily causes catalyst abrasion and poisoning, shortens catalyst service life, increases operating cost; In order to reduce the probability that catalyst stops up, generally need to select the bigger large aperture catalyst of volume, increased SCR project investment cost; For avoiding catalyst to stop up the risk that causes blowing out, main at present the employing in system's design is provided with the SCR bypass, increase the cost of investment of SCR bypass further having increased again denitration, selecting effective and efficient manner to remove the bigger flying dust of granularity in the flue gas under existing arrangement is a kind of effective corrective measure to the SCR denitrating system, and important meaning is played in stable, reliable, the economical operation of denitrating system.
For addressing the above problem, prior art adopts flue gas denitrating technique with preposed whirlwind beforehand dust removal SCR, the flue gas that to draw from boiler economizer, earlier through High-temperature resistant cyclone separator, through flue gas flow equalizing device, static mixer etc. flue gas is flowed to unification then, and with send into the SCR reactor after ammonia evenly mixes, under the catalytic action of catalyst, take place to reduce and react, owing to need to install preposition pre-dust pelletizing system in the technology, thereby there is big defective in it on economy.
At above-mentioned deficiency, need to explore the device that a kind of low input is finished flue gas ash removal, reduce the investment and the operating cost of SCR denitrating system.
Summary of the invention
In view of this, the invention provides a kind of pre-dedusting device of the SCR of being used for denitrating system, this device is when finishing the flue gas conveying function, characteristics by traditional SCR gas approach, the flue layout is improved to realize the pre-dust removal process to flue gas, reached the investment and the operating cost that reduce the SCR denitrating system.
The flue gas pre-dedusting device that is used for the SCR denitrating system of the present invention, comprise the flue that is used for to SCR reactor supplied flue gases, cross section is set on the described flue is circular dirt pocket, dirt pocket is provided with and is used for the horizontal dedusting fume inlet passage that is communicated with flue and vertical dedusting smoke-outlet flue, described dedusting fume inlet passage tangentially is communicated with dirt pocket and forms into mouth, and described dedusting smoke-outlet flue stretches into and forms mouth in the dirt pocket.
Further, described dirt pocket is cylindrical, and described dedusting smoke-outlet flue stretches into along the axis of dirt pocket;
Further, described outlet flue position is lower than into mouth;
Further, described flue comprises horizontal segment and vertical section, and described dirt pocket is arranged at horizontal segment and vertical section intersection, and dedusting fume inlet passage connection horizontal segment, dedusting smoke-outlet flue are communicated with vertical section;
Further, also comprise the ash bucket that is arranged at the dirt pocket below;
Further, described ash bucket is a turbination.
The beneficial effect of the invention: the flue gas pre-dedusting device that is used for the SCR denitrating system of the present invention, comprise the flue that is used for to SCR reactor supplied flue gases, cross section is set on the described flue is circular dirt pocket, dirt pocket is provided with and is used for the horizontal dedusting fume inlet passage that is communicated with flue and vertical dedusting smoke-outlet flue, described dedusting fume inlet passage tangentially is communicated with dirt pocket and forms into mouth, described dedusting smoke-outlet flue stretches into and forms mouth in the dirt pocket, during use, high-temperature flue gas tangentially enters dirt pocket along the dirt pocket sidewall, under dirt pocket cylindrical side wall and the formed circular passage of outlet flue sidewall drainage, produce swirling eddy, dust granule is also made circular motion with air-flow, under centrifugal action, dust moves to the dirt pocket sidewall, and falls under the gravity effect, forming the dedusting house dust mainly concentrates near the situation around the sidewall, smoke inlet is arranged at the dirt pocket middle part, and pure relatively flue gas is introduced the SCR reactor, reaches good dust removing effects.
Description of drawings
Below in conjunction with drawings and Examples the present invention is further described.
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the partial right side view of Fig. 1.
The specific embodiment
Fig. 1 is a structural representation of the present invention; Fig. 2 is the partial right side view of Fig. 1, as shown in the figure: the flue gas pre-dedusting device that is used for the SCR denitrating system of present embodiment, comprise the flue that is used for to SCR reactor 1 supplied flue gases, cross section is set on the described flue is circular dirt pocket 4, dirt pocket 4 is provided with and is used for the horizontal dedusting fume inlet passage that is communicated with flue 2 and vertical dedusting smoke-outlet flue 3, described dedusting fume inlet passage 2 tangentially is communicated with dirt pocket 4 formation and advances mouth 7, described dedusting smoke-outlet flue 3 stretches into and forms mouth 6 in the dirt pocket 4, during use, high-temperature flue gas tangentially enters dirt pocket along the dirt pocket sidewall, under dirt pocket cylindrical side wall and the formed circular passage of outlet flue sidewall drainage, produce swirling eddy, dust granule is also made circular motion with air-flow, under centrifugal action, dust moves to the dirt pocket sidewall, and under the gravity effect, fall, forming the dedusting house dust mainly concentrates near the situation around the sidewall, smoke inlet is arranged at the dirt pocket middle part, be used for pure relatively flue gas is introduced the SCR reactor, reach good dust removing effects.
In the present embodiment, what outlet flue 6 positions of described dedusting smoke-outlet flue 3 were lower than dedusting fume inlet passage 2 enters mouth 7 lower edges, directly enters smoke-outlet flue to prevent the higher flue gas of dust concentration.
In the present embodiment, described flue comprises horizontal segment and vertical section, and described dirt pocket 4 is arranged at horizontal segment and vertical section intersection, dedusting fume inlet passage 2 is communicated with horizontal segment, dedusting smoke-outlet flue 3 is communicated with vertically section, and ingenious this body structure of flue that utilizes carries out rational deployment, reduces its Installed capital cost.
In the present embodiment, the flue gas pre-dedusting device of the described SCR of being used for denitrating system also comprises the ash bucket 5 that is arranged at dirt pocket 4 belows, so that catch the flying dust that dirt pocket falls.
In the present embodiment, described ash bucket 5 is a turbination, and the turbination structure helps flue gas and makes centrifugal motion and dust at its bottom stably depositing.
The present invention in use; because fume inlet passage 2 is along the tangential setting of cylindrical dirt pocket 4 sidewalls; guaranteed that flue gas enters that to carry out circumferential flow behind the dirt pocket moving; make dust to diffusion all around; and the outlet flue position of smoke-outlet flue 3 be lower than fume inlet passage 2 enter the mouth lower edge; and be positioned at dirt pocket 4 middle parts; can guarantee that pure relatively flue gas enters into the SCR reactor by smoke-outlet flue 3; protect catalyst in reactor to avoid wearing and tearing and poisoning effectively, reduced the investment and the operating cost of SCR denitrating system.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1. flue gas pre-dedusting device that is used for the SCR denitrating system, comprise the flue that is used for to SCR reactor (1) supplied flue gases, it is characterized in that: cross section is set on the described flue is circular dirt pocket (4), dirt pocket (4) is provided with and is used for the horizontal dedusting fume inlet passage (2) that is communicated with flue and vertical dedusting smoke-outlet flue (3), described dedusting fume inlet passage (2) tangentially is communicated with dirt pocket (4) formation and advances mouth (7), and described dedusting smoke-outlet flue (3) stretches into and forms mouth (6) in the dirt pocket (4).
2. the flue gas pre-dedusting device that is used for the SCR denitrating system according to claim 1 is characterized in that: described dirt pocket (4) is for cylindrical, and described dedusting smoke-outlet flue (3) stretches into along the axis of dirt pocket (4).
3. the flue gas pre-dedusting device that is used for the SCR denitrating system according to claim 2 is characterized in that: described outlet flue (6) position is lower than into mouth (7).
4. the flue gas pre-dedusting device that is used for the SCR denitrating system according to claim 3, it is characterized in that: described flue comprises horizontal segment and vertical section, described dirt pocket (4) is arranged at horizontal segment and vertical section intersection, dedusting fume inlet passage (2) is communicated with horizontal segment, and dedusting smoke-outlet flue (3) is communicated with vertically section.
5. the flue gas pre-dedusting device that is used for the SCR denitrating system according to claim 4 is characterized in that: also comprise the ash bucket (5) that is arranged at dirt pocket (4) below.
6. the flue gas pre-dedusting device that is used for the SCR denitrating system according to claim 5 is characterized in that: described ash bucket (5) is a turbination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910190803A CN101664615A (en) | 2009-09-08 | 2009-09-08 | Flue gas pre-dedusting device used for SCR denitration system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910190803A CN101664615A (en) | 2009-09-08 | 2009-09-08 | Flue gas pre-dedusting device used for SCR denitration system |
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| CN101664615A true CN101664615A (en) | 2010-03-10 |
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| CN200910190803A Pending CN101664615A (en) | 2009-09-08 | 2009-09-08 | Flue gas pre-dedusting device used for SCR denitration system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102688686A (en) * | 2011-11-26 | 2012-09-26 | 河南科技大学 | Waste incineration flue gas dedusting, catalyzing and denitrification reaction device |
| CN112555279A (en) * | 2020-11-10 | 2021-03-26 | 济南鑫德石通精密机械有限公司 | Air floatation guide rail and processing method thereof |
-
2009
- 2009-09-08 CN CN200910190803A patent/CN101664615A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102688686A (en) * | 2011-11-26 | 2012-09-26 | 河南科技大学 | Waste incineration flue gas dedusting, catalyzing and denitrification reaction device |
| CN102688686B (en) * | 2011-11-26 | 2014-03-12 | 河南科技大学 | Waste incineration flue gas dedusting, catalyzing and denitrification reaction device |
| CN112555279A (en) * | 2020-11-10 | 2021-03-26 | 济南鑫德石通精密机械有限公司 | Air floatation guide rail and processing method thereof |
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Open date: 20100310 |