CN105169874B - Device and method for promoting water vapor condensation and removing flue gas fine particles through reflux mixing - Google Patents
Device and method for promoting water vapor condensation and removing flue gas fine particles through reflux mixing Download PDFInfo
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- CN105169874B CN105169874B CN201510657008.XA CN201510657008A CN105169874B CN 105169874 B CN105169874 B CN 105169874B CN 201510657008 A CN201510657008 A CN 201510657008A CN 105169874 B CN105169874 B CN 105169874B
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- flue gas
- removing tower
- backflow
- pipe
- tower
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Abstract
The invention relates to a device and method for promoting water vapor condensation and removing flue gas fine particles through reflux mixing. The device comprises a removing tower, a flue gas inlet, a purified flue gas outlet, a water vapor inlet, a flushing water system, an efficient demister and a flue gas return pipe. Flue gas enters the removing tower, water drops generate heterogeneous condensation on the surfaces of the flue gas fine particles under an oversaturated environment formed by the water vapor to promote the fine particles to grow, and then the grown water drops containing the particles are removed through the mesh demister. For increasing the mutual collision and coagulation effects among the grown water drops, part of the grown water drops containing the particles are extracted from the removing tower and returns back to the bottom of the removing tower to be collided and coagulated with newly generated water drops containing particles to enable smaller fine particles to further grow. Through reflux mixing, on one hand, the concentration of the water drops containing dust is increased, and the collision and coagulation probability is increased; on the other hand, vapor dissipation caused by particle concentration increasing is avoided, and the chances of nucleating and growing into the water drops containing the particles of the fine particles are increased.
Description
Technical field
The present invention relates to a kind of apparatus and method removing fine particle in flue gas, promote particularly to a kind of backflow mixing
Condensation vapor removes the fine grain device and method of flue gas.
Background technology
With air in all parts of the country, severe contamination occurs, pm2.5 quick-fried table repeatedly, pm refers to fine particle, and pm2.5 refers to greatly
In gas, aerodynamic diameter is less than or equal to 2.5 μm of particulate matter, and the daily seen haze of people is all because pm2.5 mostly
Cause.The pm2.5 of in the air passes through burning during being mainly derived from thermal power generation, commercial production, motor vehicle exhaust emission etc.
And the residue discharging, these residues contain the noxious substances such as heavy metal mostly, and pm2.5 grain diameter is little, surface area is taken greatly
Band heavy metal is various and transmission range is long, and health is brought with very big injury.
The removal efficiency that existing cleaner is directed to pm2.5 granule is extremely low, causes substantial amounts of pm2.5 granule to enter big compression ring
Border.Removal efficiency as electrostatic precipitator can reach 99%, but for this removal efficiency is only for bulky grain thing, to fine grained
Removal efficiency not high, and drastically decline with its removal efficiency of reduction of particle diameter.Currently remove fine grain research side
To the main agglomeration techniques in granule, research direction main at present has: acoustic agglomeration, coagulation simultaneously, chemical agglomeration, steam phase transformation etc.
Technology.The principle of steam phase transformation promotion Fine Particles technology is: enters steam supersaturated environments, steam containing fine grain flue gas
Condensed on the surface of granule for core with fine grained, promote fine grained long great achievement dust-containing liquid to drip, then set using traditional dedusting
Standby dust-laden drop is removed.Steam phase change technique promotes the grow up research of technology of fine grained to have a nearly century,
But still some is less and can not be trapped by cleaner for the fine grained particle diameter grown up through steam phase transformation, currently for
Steam phase transformation promote fine grained grow up technical research be mainly concentrated in promote the condensation growth on fine grained surface for the steam,
And it is directed to the promotion method of dust-laden drop coalescence after condensation there is not yet document report.
Content of the invention
Goal of the invention: for solving above-mentioned technical problem, the present invention proposes a kind of backflow mixing and promotes condensation vapor removing cigarette
The fine grain device and method of gas, can be become with fortified water vapour phase and promote fine grained coalescence in flue gas, promote growing up of fine particle
And then can be with efficient removal.
Technical scheme: the purpose of the present invention is realized by below scheme:
A kind of backflow mixing promotes the condensation vapor removing fine grain device of flue gas it is characterised in that including removing tower, takes off
Except tower bottom is provided with gas approach 1, removing tower bottom is stretched out in gas approach 1 one end, and the other end is located in removing tower and highly high
In removing tower bottom, removing top of tower is provided with neat stress outlet 2, the central axis of gas approach 1 and neat stress outlet 2 and removing
Tower central axis coincides；It is provided with flushing water system 3 below neat stress outlet 2, rinse cloth water area and the removing tower of water system 3
Cross-sectional area is equal；Rinse and be provided with mesh mist eliminator 4 below water system 3, mesh mist eliminator 4 removes for more than 3 μm of droplet
Efficiency is up to 98%, and the cross-sectional area of mesh mist eliminator 4 is equal with removing tower cross-sectional area；Removing tower outer wall side is provided with flue gas
Return duct, smoke backflow pipe is made up of hydrophobic material, defeated including reflux inlet 6, flue gas input section 7, smoke backflow section 8, flue gas
Go out section 9 and bypass outlet 14, reflux inlet 6 and smoke backflow section 8 are vertical pipeline, and flue gas input section 7 and flue gas deferent segment 9 are
Horizontal pipe；Reflux inlet 6 is located at below demister 4 in removing tower, and its center axis are coincided with removing tower central axis；Cigarette
One end of gas input section 7 is stretched in removing tower and is connected with reflux inlet 6 by a rounded bend pipeline, and the other end stretches out removing tower
It is connected with the upper port of smoke backflow section 8 by a rounded bend pipeline；The point midway of smoke backflow section 8 is provided with backflow control
Valve 11, controls smoke backflow flow to enter the 5-20% of smoke for gas approach, the lower port of smoke backflow section 8 passes through a circle
Swan neck is connected with one end of flue gas deferent segment 9, and the other end of flue gas deferent segment 9 is connected with bypass outlet 14, bypass outlet 14
It is arranged on the wall of removing tower middle and lower part side；Its outer surface of part that smoke backflow pipe is located at outside removing tower is provided with heat-insulation layer 10, uses
It is evaporated to wall in preventing the water droplet condensing in particle surface；Removing tower outer wall both sides are equipped with steam inlet 5, steam inlet 5
It is arranged on below bypass outlet 14, the vertical dimension with bypass outlet 14 is 30～50；Gas approach 1 and steam inlet 5 it
Between be provided with discharging of waste liquid pipe 12, discharging of waste liquid pipe 12 mouth of pipe is connected to discharging of waste liquid valve 13.
Preferably, described heat-insulation layer 10 includes rock wool liner and aluminum skin outsourcing.
Preferably, described flushing water system 3 includes rinsing water distributor, flushing water water inlet pipe and rinses water discharging valve, rinses
Water distributor bottom is circular slab, and circular plate suqare is equal with removing tower cross-sectional area, and circular slab is evenly distributed with water distributing pore,
Pore diameter range is 0.1～1mm.
The present invention also proposes a kind of backflow mixing and promotes the condensation vapor removing fine grain method of flue gas, walks including following
Rapid:
(1) vapor enters from the steam inlet 5 of removing tower both sides, makes to reach steam supersaturated condition in removing tower；
(2) under the supersaturated condition that steam is formed, removing tower, steam are entered containing fine grain flue gas from gas approach 1
Condense the drop being formed containing granule on fine grain surface；
(3) while step 2 is implemented, make the smoke backflow stream in smoke backflow pipe by adjusting backflow controlled value 11
Amount is about gas approach and enters the 5-20% of smoke, by the backflow effect of smoke backflow pipe, the part in removing tower containing
Grain drop returns to the bottom of removing tower by smoke backflow pipe, collides coalescence, containing after coalescence with newly-generated containing particle droplet
Particle-liquid is discharged from discharging of waste liquid pipe 12；Another part removes through mesh mist eliminator 4 with flue gas, finally containing particle droplet
Neat stress is discharged from the outlet of removing tower；
(4) rinse water system 3 granule in mesh mist eliminator 4 is rinsed, the waste liquid of flushing is flowed into removing tower
Bottom is discharged by discharging of waste liquid valve 13.
Specifically, described include the flue gas containing pm2.5 containing fine grain flue gas.
Beneficial effect: compared with prior art, the invention has the advantages that
(1) present invention process is simple, can achieve in the both sides external setting steam inlet of removing tower and smoke backflow pipe
The increase of fine particle and efficient removal.
(2) employ smoke backflow pipe, the coalescence containing fine grained drop under steam phase change conditions can be effectively promoted, carry
Fine grain effect of growing up under high steam phase change conditions, overcomes the final diameter that under steam phase change conditions, fine grained is grown up to be not enough to
The defect being removed.
Brief description
Fig. 1 is the structure that a kind of backflow mixing proposed by the present invention promotes condensation vapor to remove the fine grain device of flue gas
Figure；
Fig. 2 is the structure chart of smoke backflow pipe of the present invention；
Fig. 3 is the coalescence mechanism of action schematic diagram of the present invention.
In figure, 1, gas approach, 2, neat stress outlet, 3, rinse water system, 4, mesh mist eliminator, 5, steam inlet, 6,
Reflux inlet, 7, flue gas input section, 8, smoke backflow section, 9, flue gas deferent segment, 10, heat-insulation layer, 11, backflow controlled value, 12,
Discharging of waste liquid pipe, 13, discharging of waste liquid valve, 14, bypass outlet, 15, granule, 16, the dropping liquid that condenses of particle surface.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is further described.
Being illustrated in figure 1 a kind of backflow mixing proposed by the present invention promotes condensation vapor to remove the fine grain device of flue gas
Structure chart, Fig. 2 show the structure chart of smoke backflow pipe of the present invention, and as seen from Figure 1, Figure 2, a kind of backflow proposed by the present invention is mixed
Close and promote the condensation vapor removing fine grain device of flue gas, this device includes removing tower, removing tower bottom is provided with gas approach 1,
Removing tower bottom is stretched out in gas approach 1 one end, and the other end is located in removing tower and height is higher than removing tower bottom, removes top of tower
It is provided with neat stress outlet 2, the central axis of gas approach 1 and neat stress outlet 2 is coincided with removing tower central axis；Neat stress
It is provided with flushing water system 3, the cloth water area rinsing water system 3 is equal with removing tower cross-sectional area below outlet 2；Rinse water system
It is provided with mesh mist eliminator 4, mesh mist eliminator 4 is up to 98% for the droplet removal efficiency of more than 3um, mesh mist eliminator 4 below 3
Cross-sectional area equal with removing tower cross-sectional area；Removing tower outer wall side is provided with smoke backflow pipe, and smoke backflow pipe is by hydrophobic
Material is made, and including reflux inlet 6, flue gas input section 7, smoke backflow section 8, flue gas deferent segment 9 and bypass outlet 14, passes back into
Mouth 6 and smoke backflow section 8 are vertical pipeline, and flue gas input section 7 and flue gas deferent segment 9 are horizontal pipe；Reflux inlet 6 is located at de-
Below mesh mist eliminator 4 in tower, its center axis are coincided with removing tower central axis；One end of flue gas input section 7 is stretched into
It is connected with reflux inlet 6 by a rounded bend pipeline in removing tower, the other end stretches out removing tower and passes through a rounded bend pipeline
It is connected with the upper port of smoke backflow section 8；The point midway of smoke backflow section 8 is provided with backflow controlled value 11, controls flue gas to return
Stream flow enters the 5-20% of smoke for gas approach, and the lower port of smoke backflow section 8 is passed through a rounded bend pipe and exported with flue gas
One end of section 9 is connected, and the other end of flue gas deferent segment 9 is connected with bypass outlet 14, under bypass outlet 14 is arranged in removing tower
On the wall of portion side；Its outer surface of part that smoke backflow pipe is located at outside removing tower is provided with heat-insulation layer 10, is used for preventing from condensing in granule
The water droplet on surface is evaporated to wall；Removing tower outer wall both sides are equipped with steam inlet 5, and steam inlet 5 is arranged on bypass outlet 14
Lower section, the vertical dimension with bypass outlet 14 is 30～50；It is provided with discharging of waste liquid pipe between gas approach 1 and steam inlet 5
12, discharging of waste liquid pipe 12 mouth of pipe is connected to discharging of waste liquid valve 13.
As the preferred embodiments of the present invention, the heat-insulation layer 10 in said apparatus includes rock wool liner and aluminum skin outsourcing；On
State the flushing water system 3 in device to include rinsing water distributor, flushing water water inlet pipe and rinse water discharging valve, rinse water distributor bottom
Portion is circular slab, and circular plate suqare is equal with removing tower cross-sectional area, circular slab is evenly distributed with water distributing pore, pore diameter range is
0.1～1mm.
Backflow mixing proposed by the present invention promotes the condensation vapor removing fine grain device of flue gas to fine grain in flue gas
Subtractive process is as follows:
Enter after removing tower from gas approach 1 containing fine grain flue gas, the supersaturated environments being formed in the steam of injection are made
With under, steam can with granule for core formed the drop containing granule, as shown in accompanying drawing 3 left hand view；For making to be formed in removing tower
The oversaturated condition of steam, is determined by exhaust gas volumn from the steam addition of steam inlet 5 input, the addition of quantity of steam is to make
The aqueous degree of supersaturation of flue gas is 1.2 about.A dust-laden drop part enters smoke backflow pipe from reflux inlet 6, returns along flue gas
Stream section enters removing tower from bypass outlet 14, and newly-generated containing the collision Caragana seed pests between particle droplet, its mechanism is for example attached
Shown in Fig. 3；Another part dust-laden drop removes through mesh mist eliminator 4 with flue gas, and last neat stress is from the neat stress of removing tower
Outlet 2 discharge.Rinse water system 3 granule in mesh mist eliminator 4 is regularly rinsed, the waste liquid of flushing is flowed into removing
The bottom of tower.Port height in removing tower for the gas approach 1 15～30cm higher than the lower limb of removing tower, so can in case
Only waste liquid flows into gas approach 1, the bottom of removing tower is provided with discharging of waste liquid pipe 12 and discharging of waste liquid valve 13, can discharge punching
The waste liquid washed.
The structure of smoke backflow pipe as shown in Fig. 2 smoke backflow pipe is made up of the material of 150 DEG C of good, the resistance to temperature of hydrophobicity,
At the 3 of smoke backflow pipe, elbow all avoids using elbow bend, reduces smoke flow resistance using fillet elbow, simultaneously in flue gas
The pipeline external setting heat-insulation layer that return duct is located at outside removing tower is returned with preventing the water droplet condensing in particle surface to be evaporated to flue gas
Flow tube wall.The reflux inlet 6 of smoke backflow pipe is arranged on removing tower inside center axis, and bypass outlet 14 is arranged on removing
On the middle and lower part side wall of tower, the direction of the flue gas entrance removing tower of backflow is vertical with removing tower axis direction, so can profit
Flowed back with the momentum of flue gas itself thus interpolation pump need not be increased make smoke backflow, change flue gas pressures state and lead to
The evaporation of particle surface drop.In order that the flue gas of backflow has enough momentum, smoke backflow flow is about gas approach and enters
The 5-20% of smoke, can carry out flue gas flow regulation by backflow controlled value 11.
In order to strengthen heat insulation effect, described heat-insulation layer includes rock wool liner and aluminum skin outsourcing.
The above be only the preferred embodiment of the present invention it should be pointed out that: for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (5)
1. a kind of backflow mixing promotes the condensation vapor removing fine grain device of flue gas it is characterised in that including removing tower, removing
Tower bottom is provided with gas approach (1), and removing tower bottom is stretched out in gas approach (1) one end, and the other end is located in removing tower and height
Higher than removing tower bottom, removing top of tower is provided with neat stress outlet (2), the central shaft of gas approach (1) and neat stress outlet (2)
Line is coincided with removing tower central axis；It is provided with flushing water system (3) below neat stress outlet (2), rinse the cloth of water system (3)
Water area is equal with removing tower cross-sectional area；Rinse and below water system (3), be provided with mesh mist eliminator (4), its cross-sectional area with de-
Except tower cross-sectional area is equal；Removing tower outer wall side is provided with smoke backflow pipe, and smoke backflow pipe is made up of hydrophobic material, including return
Inflow entrance (6), flue gas input section (7), smoke backflow section (8), flue gas deferent segment (9) and bypass outlet (14), reflux inlet (6)
It is vertical pipeline with smoke backflow section (8), flue gas input section (7) and flue gas deferent segment (9) are horizontal pipe；Reflux inlet (6)
Below mesh mist eliminator (4) in removing tower, its center axis are coincided with removing tower central axis；Flue gas input section (7)
One end stretch into and be connected with reflux inlet (6) by a rounded bend pipeline in removing tower, the other end stretches out removing tower by one
Rounded bend pipeline is connected with the upper port of smoke backflow section (8)；The point midway of smoke backflow section (8) is provided with recycle control valve
Door (11), controls smoke backflow flow to enter the 5-20% of smoke for gas approach, the lower port of smoke backflow section (8) passes through a circle
Shape swan neck is connected with the one end of flue gas deferent segment (9), and the other end of flue gas deferent segment (9) is connected with bypass outlet (14), returns
Flow export (14) is arranged on the wall of removing tower middle and lower part side；Its outer surface of part that smoke backflow pipe is located at outside removing tower is provided with guarantor
Warm layer (10), for preventing the water droplet condensing in particle surface to be evaporated to wall；Removing tower outer wall both sides are equipped with steam inlet
(5), steam inlet (5) are arranged on below bypass outlet (14), and the vertical dimension with bypass outlet (14) is 30～50；Flue gas
It is provided with discharging of waste liquid pipe (12), discharging of waste liquid pipe (12) mouth of pipe is connected to discharging of waste liquid valve between import (1) and steam inlet (5)
(13).
2. a kind of backflow mixing according to claim 1 promotes the condensation vapor removing fine grain device of flue gas, its feature
It is, described heat-insulation layer (10) includes rock wool liner and aluminum skin outsourcing.
3. a kind of backflow mixing according to claim 1 promotes the condensation vapor removing fine grain device of flue gas, its feature
It is, described flushing water system (3) includes rinsing water distributor, flushing water water inlet pipe and rinses water discharging valve, rinses water distribution
Device bottom is circular slab, and circular plate suqare is equal with removing tower cross-sectional area, and circular slab is evenly distributed with water distributing pore, aperture model
Enclose for 0.1～1mm.
4. the device backflow mixing described in a kind of utilization claim 1 promotes the condensation vapor removing fine grain method of flue gas, its
It is characterised by, comprise the following steps:
(1) vapor enters from the steam inlet (5) of removing tower both sides, makes to reach steam supersaturated condition in removing tower；
(2) under the supersaturated condition that steam is formed, enter removing tower containing fine grain flue gas from gas approach (1), steam exists
Fine grain surface condenses the drop being formed containing granule；
(3) while step (2) is implemented, make the smoke backflow stream in smoke backflow pipe by adjusting backflow controlled value (11)
Measure the 5-20% entering smoke for gas approach, by the backflow of smoke backflow pipe effect, the part in removing tower containing granule
Drop returns to the bottom of removing tower by smoke backflow pipe, with newly-generated containing particle droplet collide coalescence, after coalescence containing
Grain liquid is discharged from discharging of waste liquid pipe (12)；Another part contains particle droplet and removes through mesh mist eliminator (4) with flue gas,
Neat stress is discharged from the outlet of removing tower afterwards；
(4) rinse water system (3) granule in mesh mist eliminator (4) is rinsed, the waste liquid of flushing is flowed into removing tower
Bottom is passed through discharging of waste liquid valve (13) and is discharged.
5. the device backflow mixing described in a kind of utilization claim 1 according to claim 4 promotes condensation vapor removing
The fine grain method of flue gas is it is characterised in that described include the flue gas containing pm2.5 containing fine grain flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510657008.XA CN105169874B (en) | 2015-10-12 | 2015-10-12 | Device and method for promoting water vapor condensation and removing flue gas fine particles through reflux mixing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510657008.XA CN105169874B (en) | 2015-10-12 | 2015-10-12 | Device and method for promoting water vapor condensation and removing flue gas fine particles through reflux mixing |
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| Publication Number | Publication Date |
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| CN105169874A CN105169874A (en) | 2015-12-23 |
| CN105169874B true CN105169874B (en) | 2017-02-01 |
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| CN201510657008.XA Expired - Fee Related CN105169874B (en) | 2015-10-12 | 2015-10-12 | Device and method for promoting water vapor condensation and removing flue gas fine particles through reflux mixing |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105817112B (en) * | 2016-04-20 | 2018-02-06 | 东南大学 | It is a kind of based on steam phase transformation coupling voltolisation and dedusting pretreatment unit and method |
| CN106823723A (en) * | 2017-03-10 | 2017-06-13 | 东南大学 | A kind of photoelectric induction free radical combined steam phase transformation smoke eliminator and method |
| CN113058371B (en) * | 2021-03-15 | 2022-09-06 | 东南大学 | Device and method for removing fine particulate matters by coupling reflux turbulence agglomeration with water vapor phase change |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5413227A (en) * | 1992-10-05 | 1995-05-09 | Midwest Research Institute | Improved vortex reactor system |
| CN201880450U (en) * | 2010-11-25 | 2011-06-29 | 东南大学 | Device for removing fine particulate matter from high-humidity flue gas |
| CN102427869A (en) * | 2009-03-16 | 2012-04-25 | 布莱阿姆青年大学 | Methods and systems for separating condensable vapors from gases |
| CN104190199A (en) * | 2014-09-02 | 2014-12-10 | 国家***第三海洋研究所 | Device and method for removing fine particles by virtue of acoustic wave and phase change coupling effect |
| CN104548824A (en) * | 2014-12-25 | 2015-04-29 | 重庆大学 | Device and method for removing fine particles from gas |
-
2015
- 2015-10-12 CN CN201510657008.XA patent/CN105169874B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5413227A (en) * | 1992-10-05 | 1995-05-09 | Midwest Research Institute | Improved vortex reactor system |
| CN102427869A (en) * | 2009-03-16 | 2012-04-25 | 布莱阿姆青年大学 | Methods and systems for separating condensable vapors from gases |
| CN201880450U (en) * | 2010-11-25 | 2011-06-29 | 东南大学 | Device for removing fine particulate matter from high-humidity flue gas |
| CN104190199A (en) * | 2014-09-02 | 2014-12-10 | 国家***第三海洋研究所 | Device and method for removing fine particles by virtue of acoustic wave and phase change coupling effect |
| CN104548824A (en) * | 2014-12-25 | 2015-04-29 | 重庆大学 | Device and method for removing fine particles from gas |
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| CN105169874A (en) | 2015-12-23 |
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