CN106621649B - A kind of SCR denitration system removes the device and method of puffed rice ash in advance - Google Patents
A kind of SCR denitration system removes the device and method of puffed rice ash in advance Download PDFInfo
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- CN106621649B CN106621649B CN201610940901.8A CN201610940901A CN106621649B CN 106621649 B CN106621649 B CN 106621649B CN 201610940901 A CN201610940901 A CN 201610940901A CN 106621649 B CN106621649 B CN 106621649B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
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Abstract
The invention discloses a kind of SCR denitration systems to remove puffed rice apparatus for ash in advance, vertical well gas flue, horizontal flue and uptake flue including sequential connection, and horizontal flue is respectively streamlined contour with the turn junction of vertical well gas flue and uptake flue；Ash bucket is arranged in the downside of horizontal flue bottom plate, and upper lateral edge flow of flue gas direction sets gradually trap, separator and filter screen；Flue gas communication port is opened up on the bottom plate of horizontal flue tail portion, is connected with ash bucket.The invention also provides a kind of SCR denitration systems to remove puffed rice ash method in advance, wall characteristics are got rid of in the streamlined vertical well gas flue installed using no deflector and horizontal flue junction, form the high ash concentration flue gas stream of near wall region, successively using based on impacting type separation, gravity settling separation and the trap, separator and the filter screen that intercept separation principle is streamed, puffed rice ash and flue gas are efficiently separated.The method achieve the fast and effective separation to high-temperature high concentration puffed rice ash, have device structure simple, the stable feature of operational safety.
Description
Technical field
The present invention relates to the method and devices that a kind of SCR denitration system removes puffed rice ash in advance, belong to atmosphere pollution control
Technical field.
Background technique
Puffed rice ash be it is a kind of be formed in boiler heating surface surface bulky grain ash, general size can achieve 10mm and with
On, in addition to this, this ash also has the characteristics such as low-density, loose porous and shape be irregular.Therefore, in SCR denitration system
In, puffed rice ash once enter catalyst layer, will certainly abrasive catalyst surface, reduce catalyst activity, sometimes even can block up
Filling in catalyst duct makes SCR system denitration function rapid failure to aggravate the abrasion of unplugged side catalyst.
The blocking of puffed rice ash in order to prevent, it is necessary to which pre- ash disposal processing is carried out to the flue gas for entering catalyst layer.Currently,
The common practices of developed countries and regions is ash bucket to be arranged below steering flue, and it is excellent to use cfdrc to carry out
Change design, but do not obtain promising result during the concrete application of this method power plant at home, main cause is the country right
What denitrating system considered first when designing is flow field uniformity optimization, i.e., water conservancy diversion is arranged in the biggish steering flue of velocity gradient
Plate.The application of deflector forces flue gas flow velocity in entire flue cross section uniform, this will make the ash quantity for flowing into ash bucket relatively low, from
And significantly reduce whole ash disposal efficiency.Also there is part power plant to take the measure for installing filter screen additional in flue, but rely solely on list
One filter screen is difficult effectively to trap most of soot particle, and efficiency of dust collection is obviously limited by the pore size of filter screen, because
Too small aperture of filter screen can greatly increase the droop loss of flue.
By analyzing above it is found that in order to reduce the abrasion of SCR denitration system catalyst, the denitration energy of whole system is improved
Power, be highly desirable to develop it is a kind of neither dramatically increase denitrating system pressure drop, and can efficiently separate the pre- ash disposal side of puffed rice ash
Method and device.
Summary of the invention
Goal of the invention: the present invention leads to catalyst blockage, serious wear there are puffed rice ash in SCR denitration system
Etc. outstanding problems, the device and method that a kind of SCR denitration system removes puffed rice ash in advance is provided, for being segregated into catalyst layer
Puffed rice ash in preceding denitration flue gas.
Technical solution: in order to solve the above technical problems, the present invention provides a kind of SCR denitration systems to remove puffed rice ash in advance
Device, vertical well gas flue, horizontal flue and uptake flue including sequential connection, in which:
The vertical well gas flue is vertically connected with horizontal flue, and turn junction is arranged to streamlined contour, and inside is not set
Set deflector.
Ash bucket is arranged in the downside of the horizontal flue bottom plate, and 1~20 trap is arranged in the front on the upside of bottom plate, along flue gas
Flow direction is arranged in juxtaposition, and the lower part of each trap is correspondingly arranged a separating plate；Setting 10~100 in the middle part of horizontal flue
Separator, top are connected with horizontal flue top plate, and lower part is connected with horizontal flue bottom plate, and be connected in ash bucket；Horizontal cigarette
Two layers of filter screen is arranged in road rear portion, and first layer filter screen is longitudinally arranged, and upper and lower both ends are individually fixed in top plate and bottom plate, the second layer
Filter screen lateral arrangement, left and right both ends are individually fixed in side plate, are connected in bottom and ash bucket；It is opened on the bottom plate of horizontal flue tail portion
If flue gas communication port, is connected with ash bucket.
The uptake flue is vertically connected with horizontal flue, and turn junction is arranged to streamlined contour, inside setting
Deflector.
The trap is made of entrapment plate, drainage plate and flow straightener, wherein entrapment plate and horizontal flue bottom plate angle
For θ=35~50 °, meets stream end and be higher than bottom plate H=50~120mm；Drainage plate is arc-shaped, front end and the tangent connection of entrapment plate,
Rear end and the front end of adjacent entrapment plate are vertically aligned；Flow straightener is in up-side down triangle, is placed in drainage plate lower end, wherein a line is being caught
On the extended line for collecting plate.
The separating plate is welded by the identical steel plate of two block sizes, and angle is α=75~90 °, every piece of separating plate
Vertex and drainage plate rear end in same vertical direction, and at a distance of E=150~500mm, the fluoran stream surface and entrapment plate of separating plate
Extended line be mutually perpendicular to.
Groove type is presented in the separator, and concave surface is arranged to two rows, is in against direction of flow, 10~100 separators
It is staggered in arrangement, each separator and bottom plate inclination angle are β=60~75 °, and every row's separator is at a distance of W=100~180mm, each column point
From device at a distance of L=100~150mm.
Present invention further proposes a kind of dust removal method for removing puffed rice apparatus for ash in advance using above-mentioned SCR denitration system,
It is characterized by comprising the following steps:
(1) when flowing through the ash-laden gas come from boiler vertical well gas flue and being redirected into horizontal flue, in gravity and centrifugal force
Under collective effect, it is thrown toward the biggish puffed rice ash of horizontal flue lower area, especially partial size, bottom plate movement is against, utilizes
Several traps are arranged in such case at the bottom plate of horizontal flue.
(2) flue gases of some entrainment greater particle size puffed rice ashes are under the drainage of first piece of entrapment plate, into ash bucket,
And impinge upon on separating plate, puffed rice ash is moved downward along separating plate side plate under the effect of gravity, and falls hopper bottom, cigarette
Gas under the action of negative pressure, is moved upwards along separating plate side plate.
(3) it is some entrainment greater particle size puffed rice ashes flue gases under the collective effect of drainage plate and second piece of entrapment plate,
Into ash bucket, the process of step (2) is repeated.
(4) flue gas of some entrainment medium grain size puffed rice ashes and cinder enters in the middle part of horizontal flue, separates with first row
The groove surface of device is hit, and flue gas flows out around groove surface from first row separator gap, and puffed rice ash and cinder are along groove surface
Slide downward enters ash bucket by the outlet of bottom, the entrainment medium grain size puffed rice ash flowed through from first row separator gap
It is hit with the flue gas of cinder and the groove surface of second row separator, and repeats above procedure.
(5) some entrainment small particle puffed rice ashes and the flue gas of fine ash enter horizontal flue rear portion, make with two layers of filter screen
With part ash is intercepted to fall into ash bucket, and the flue gas of Rao Liuhou enters uptake flue by the current balance function of deflector.
(6) enter the puffed rice ash in ash bucket region under gravitational settling effect, fall into the grey library of hopper bottom, and enter ash
The flue gas in bucket region then imports the main flume of horizontal flue from flue gas communication port under the action of negative pressure, also passes through deflector
Enter uptake flue after current balance function.
The utility model has the advantages that compared with conventional SCR denitration device, the present invention have the advantages that following characteristic and:
(1) conventional scr denitrification apparatus does not install pre-dedusting device additional additionally usually, only in the case where turning to flue or horizontal flue
Ash bucket is installed in side, and the biggish puffed rice particle of fraction partial size is collected in sedimentation, and the present invention has specially installed pre-dedusting device additional, can
Most puffed rice ashes and a part of fine ash are removed, the ash abrasion for significantly reducing flue inner supporting structure and catalyst is asked
Topic.
(2) present invention has organically combined a variety of gas solid separation principles, such as turn to the centrifuge separation principle of bend, separating plate and
Separator streams impacting type separation principle, the interception separation principle of filter screen and sedimentation theory of ash bucket etc., this more
Efficiently separating for puffed rice ash and flue gas may be implemented in the integrated application of physical process.
(3) present invention is provided with trap on the bottom plate of horizontal flue, and the structure is by entrapment plate and the organic knot of drainage plate
It closes, has effectively trapped high cloud of dust gas, provide the foundation for subsequent gravity settling separation with streaming impacting type and separate.
(4) separator that the present invention uses meets stream and integral inclined arrangement, this arrangement in horizontal flue inner groovy
Both be effectively utilized separator streams impacting type separation principle, has been greatly reduced the local resistance of separator, can protect
Do not increase system energy consumption on the basis of card efficiency of dust collection.
(5) longitudinal twine and lateral twine are separated by a distance arrangement, this arrangement side by the filter screen that the present invention uses
Formula reduces droop loss of the flue gas by filter screen on the basis of guaranteeing certain separative efficiency, helps to reduce air-introduced machine
Power consumption.
Detailed description of the invention
Fig. 1 is that the SCR denitration system of the embodiment of the present invention removes the main view of puffed rice apparatus for ash in advance, wherein having: vertical shaft cigarette
Road -1；Horizontal flue -2；Uptake flue -3；Ash bucket -4；Top plate -5；Bottom plate -6；Trap -7；Separating plate -8；Point
From device -9；Filter screen -10；Flue gas communication port -11；
Fig. 2 is that the SCR denitration system of the embodiment of the present invention removes trap schematic diagram in puffed rice apparatus for ash in advance；
Fig. 3 is that the SCR denitration system of the embodiment of the present invention removes separator partial schematic diagram in puffed rice apparatus for ash in advance；
Fig. 4 is that the SCR denitration system of the embodiment of the present invention removes the schematic diagram in A-A direction of puffed rice apparatus for ash in advance；
Fig. 5 is that the SCR denitration system of the embodiment of the present invention removes the B-B direction schematic diagram of puffed rice apparatus for ash in advance.
Specific embodiment
The invention proposes the devices that a kind of SCR denitration system removes puffed rice ash in advance, as shown in figures 1-4, including sequentially connect
Vertical well gas flue 1, horizontal flue 2 and the uptake flue 3 connect, vertical well gas flue 1 are vertically connected with horizontal flue 2, and turn junction is set
It is set to streamlined contour, inside is not provided with deflector, and uptake flue 3 is vertically connected with horizontal flue 2, and turn junction is arranged to
Ash bucket 4 is arranged in streamlined contour, inside setting deflector, the downside of horizontal flue bottom plate 6, and the front setting of 6 upside of bottom plate is caught
Separator 9 is arranged in storage 7, the middle part between top plate 5 and bottom plate 6, and filter screen 10 is arranged in rear portion, and flue gas company is opened up on the bottom plate of tail portion
Port 11.
Wherein, trap (as shown in Figure 2) is made of entrapment plate 12, drainage plate 13 and flow straightener 14, entrapment plate 12 and water
Flat flue bottom plate angle is θ=35~50 °, meets stream end and is higher than bottom plate H=50~120mm, and drainage plate 13 is arc-shaped, front end with
The tangent connection of entrapment plate 12, rear end and the front end of adjacent entrapment plate 12 are vertically aligned, and flow straightener 14 is in up-side down triangle, are placed in drainage
13 lower end of plate, wherein a line is on the extended line of entrapment plate 12.1~20 trap is arranged in juxtaposition along flow of flue gas direction,
The lower part of each trap is correspondingly arranged a separating plate.
Separating plate 8 is welded by the identical steel plate of two block sizes, and angle is α=75~90 °, the vertex of every piece of separating plate
Rear end with drainage plate is in same vertical direction, and E=150~500mm apart, the extension of the fluoran stream surface and entrapment plate of separating plate
Line is mutually perpendicular to.
Groove type is presented in separator 9, and top is connected with horizontal flue top plate, and lower part is connected with horizontal flue bottom plate, and with
It being connected in ash bucket, concave surface is arranged to two rows against direction of flow, 10~100 separators, in being staggered in arrangement, each separator
Be β=60~75 ° with bottom plate inclination angle, every row's separator at a distance of W=100~180mm, each column separator at a distance of L=100~
150mm。
Filter screen 10 is longitudinally arranged in point two layers of arrangement, first layer filter screen, and upper and lower both ends are individually fixed in top plate and bottom
Plate, second layer filter screen lateral arrangement, left and right both ends are individually fixed in side plate, are connected in bottom and ash bucket, in terms of the direction AA, two
Layer filter screen reticulates in a crisscross manner, as shown in figure 4, can see the filter screen being laterally arranged from BB view, such as Fig. 5 institute
Show.
Below by way of the application process of specific embodiment the present invention will be described in detail technical solution.The present embodiment is with this skill
Implemented under premised on art scheme, gives embodiment, but protection scope of the present invention is not limited to following embodiments.
The present embodiment carries out the transformation of SCR denitration dedusting technology for certain coal burning boiler of power station, which is
200000Nm3/ h, horizontal flue sectional dimension are high 1.8m, width 2m, depth 6m.After transformation, horizontal flue and vertical well gas flue are turned round
Shape in the arc-shaped is arranged in junction, and inside is not provided with deflector.Ash bucket is set in the downside of horizontal flue bottom plate, covering is entire
Bottom plate.Front on the upside of horizontal flue bottom plate is arranged 5 traps being arranged in juxtaposition along flow of flue gas direction, each trap by
Entrapment plate, drainage plate and flow straightener composition.Entrapment plate and horizontal flue bottom plate angle are 45 °, meet stream end and are higher than bottom plate 80mm.Circle
Arc drains front edge of board and the tangent connection of entrapment plate, and rear end and the front end of adjacent entrapment plate are vertically aligned.In the steady of up-side down triangle
Stream device is placed in drainage plate lower end, and wherein a line is on the extended line of entrapment plate.
Two rows of separators are set in the middle part of horizontal flue, and groove type is presented in each separator, and concave surface is in against direction of flow
It is in tilted layout, is 68 ° with bottom plate inclination angle, top is connected with horizontal flue top plate, and lower part is connected with horizontal flue bottom plate, every row point
From device at a distance of 150mm, each column separator is staggered in arrangement at a distance of 120mm, and separator bottom is connected with ash bucket.
Two layers of filter screen is set at horizontal flue rear portion, first layer filter screen is longitudinally arranged, and upper and lower both ends are individually fixed in
Top plate and bottom plate, second layer filter screen lateral arrangement, left and right both ends are individually fixed in side plate, are connected in bottom and ash bucket.Water
Flue gas communication port is opened up on flat flue tail bottom plate, is connected with ash bucket.
Separating plate is welded by the identical steel plate of two block sizes, and angle is 85 °, and the lower part of each trap is arranged in,
The vertex of every piece of separating plate and the rear end of drainage plate are in same vertical direction, and at a distance of 300mm, the fluoran stream surface of separating plate and trapping
The extended line of plate is mutually perpendicular to.
When SCR denitration system removes the device work of puffed rice ash in advance, the ash-laden gas come is flowed through from boiler downward-flow flue
When being redirected into horizontal flue, under the collective effect of gravity and centrifugal force, it is thrown toward horizontal flue lower area, especially grain
The biggish puffed rice ash of diameter, againsts bottom plate movement.At this point, the flue gas of some entrainment greater particle size puffed rice ashes is trapped at first piece
Under the drainage of plate, into ash bucket, and impinge upon on separating plate, puffed rice ash under the effect of gravity along separating plate side plate to
Lower movement, and hopper bottom is fallen, flue gas under the action of negative pressure, is moved upwards along separating plate side plate.Other entrainments are larger
The flue gas of partial size puffed rice ash, into ash bucket, repeats the above process under the collective effect of drainage plate and second piece of entrapment plate.And
The flue gas of some entrainment medium grain size puffed rice ashes and cinder enters in the middle part of horizontal flue, hits with the groove surface of first row separator
It hits, flue gas flows out around groove surface from first row separator gap, and puffed rice ash and cinder pass through along groove surface slide downward
The outlet of bottom enters ash bucket, flowed through from first row separator gap entrainment medium grain size puffed rice ash and cinder flue gas with
The groove surface of first row separator is hit, and repeats above procedure.The cigarette of remaining some entrainment small particle puffed rice ashes and fine ash
Gas enters horizontal flue rear portion, acts on two layers of filter screen, and part ash is intercepted to fall into ash bucket, and flue gas passes through the stream of deflector
Enter uptake flue after effect.Into ash bucket region puffed rice ash gravitational settling effect under, fall into the grey library of hopper bottom,
And the flue gas for entering ash bucket region then imports the main flume of horizontal flue from flue gas communication port under the action of negative pressure, also passes through
Enter uptake flue after the current balance function of deflector.
The present invention has organically combined a variety of gas solid separation principles, such as turn to the centrifuge separation principle of bend, separating plate and point
Impacting type separation principle, the interception separation principle of filter screen and sedimentation theory of ash bucket etc., this more objects are streamed from device
Efficiently separating for puffed rice ash and flue gas may be implemented in the integrated application of reason process.Meanwhile by the bottom plate of horizontal flue
Provided with trap, which organically combines entrapment plate and drainage plate, has effectively trapped high cloud of dust gas, is subsequent gravitational settling
It separates and streams impacting type separation and provide the foundation.
In addition, the separator that the present invention uses meets stream and integral inclined arrangement, this arrangement side in horizontal flue inner groovy
What formula had both been effectively utilized separator streams impacting type separation principle, has been greatly reduced the local resistance of separator, Ke Yi
Guarantee not increase system energy consumption on the basis of efficiency of dust collection.On the other hand, by using filter screen by longitudinal twine and transverse direction
Twine is separated by a distance arrangement, and this arrangement reduces flue gas and passed through on the basis of guaranteeing certain separative efficiency
The droop loss of strainer facilitates the power consumption for reducing air-introduced machine.
Claims (5)
1. the device that a kind of SCR denitration system removes puffed rice ash in advance, which is characterized in that the SCR denitration system removes rice krispies in advance
Flower apparatus for ash includes vertical well gas flue, horizontal flue and the uptake flue being linked in sequence, and the vertical well gas flue and horizontal flue are turning
Curved junction is streamlined contour, and inside is not provided with deflector；Ash bucket is arranged in the downside of the horizontal flue bottom plate；The level
Trap is arranged in front on the upside of flue bottom plate；Separator is set in the middle part of the horizontal flue；The horizontal flue rear portion setting
Filter screen；Flue gas communication port is opened up on the bottom plate of the horizontal flue tail portion, is connected with ash bucket；The uptake flue and horizontal cigarette
Road turn junction is arranged to streamlined contour, and inside setting deflector, the trap is by entrapment plate, drainage plate and current stabilization
Device composition, wherein entrapment plate and horizontal flue bottom plate angle are θ=35 ~ 50 °, meet stream end and are higher than bottom plate H=50 ~ 120mm, each
Separating plate is provided with below trap, the separating plate is welded by the identical steel plate of two block sizes, angle be α=75 ~
90 °, in same vertical direction, and at a distance of E=150 ~ 500mm, separating plate is met for the vertex of every piece of separating plate and the rear end of drainage plate
The extended line of stream interface and entrapment plate is mutually perpendicular to.
2. the device that SCR denitration system according to claim 1 removes puffed rice ash in advance, which is characterized in that the drainage plate
It is arc-shaped, front end and the tangent connection of entrapment plate, rear end and the front end of adjacent entrapment plate are vertically aligned.
3. the device that SCR denitration system according to claim 1 removes puffed rice ash in advance, which is characterized in that the flow straightener
In up-side down triangle, it is placed in drainage plate lower end, wherein a line is on the extended line of entrapment plate.
4. the device that SCR denitration system according to claim 1 removes puffed rice ash in advance, which is characterized in that the separator
Groove type is presented, concave surface is arranged to two rows against direction of flow, 10 ~ 100 separators, in being staggered in arrangement, each separator with
Bottom plate inclination angle is β=60 ~ 75 °, and every row's separator is at a distance of W=100 ~ 180mm, and each column separator is at a distance of L=100 ~ 150mm.
5. a kind of dust removal method for the device for being removed puffed rice ash in advance using SCR denitration system described in claim 1, feature are existed
In including the following steps:
(1) when flowing through the ash-laden gas come from boiler vertical well gas flue and being redirected into horizontal flue, in the common of gravity and centrifugal force
Under effect, it is thrown toward horizontal flue lower area, bottom plate movement is against, using such case, is set at the bottom plate of horizontal flue
Set several traps；
(2) flue gas of some entrainment greater particle size puffed rice ashes into ash bucket, and is hit under the drainage of first piece of entrapment plate
It hits on separating plate, puffed rice ash is moved downward along separating plate side plate under the effect of gravity, and falls hopper bottom, and flue gas exists
Under suction function, moved upwards along separating plate side plate；
(3) flue gas of some entrainment greater particle size puffed rice ashes enters under the collective effect of drainage plate and second piece of entrapment plate
Ash bucket repeats the process of step (2)；
(4) flue gas of some entrainment medium grain size puffed rice ashes and cinder enters in the middle part of horizontal flue, with first row separator
Groove surface is hit, and flue gas flows out around groove surface from first row separator gap, puffed rice ash and cinder along groove downwards
Sliding, enters ash bucket by the outlet of bottom, the entrainment medium grain size puffed rice ash flowed through from first row separator gap and thick
The flue gas of ash and the groove surface of second row separator are hit, and repeat above procedure；
(5) some entrainment small particle puffed rice ashes and the flue gas of fine ash enter horizontal flue rear portion, act on two layers of filter screen, portion
Divide ash is intercepted to fall into ash bucket, the flue gas of Rao Liuhou enters uptake flue by the current balance function of deflector；
(6) enter the puffed rice ash in ash bucket region under gravitational settling effect, fall into the grey library of hopper bottom, and enter ash bucket area
The flue gas in domain then imports the main flume of horizontal flue from flue gas communication port under the action of negative pressure, also passes through the stream of deflector
Enter uptake flue after effect.
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| CN201610940901.8A CN106621649B (en) | 2016-11-01 | 2016-11-01 | A kind of SCR denitration system removes the device and method of puffed rice ash in advance |
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| CN108339327B (en) * | 2018-03-14 | 2020-06-09 | 武汉森源蓝天环境科技工程有限公司 | Agricultural and forestry discarded object power plant denitration flue gas preprocessing device |
| CN108339398A (en) * | 2018-04-28 | 2018-07-31 | 大唐环境产业集团股份有限公司 | Power station SCR system ash hopper device based on high centrifugal force flue and brave tooth plate |
| CN111686541A (en) * | 2020-05-08 | 2020-09-22 | 北新集团建材股份有限公司 | Dust removal device and dust removal equipment |
| CN114893725A (en) * | 2022-05-05 | 2022-08-12 | 中冶华天工程技术有限公司 | Novel coal gas drainage and pollution discharge pipeline system |
| CN115025878A (en) * | 2022-07-26 | 2022-09-09 | 武汉钢铁有限公司 | Method and system for pretreating and strengthening dust removal of flue gas of sintering machine head |
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