CN105169874A - 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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- CN105169874A CN105169874A CN201510657008.XA CN201510657008A CN105169874A CN 105169874 A CN105169874 A CN 105169874A CN 201510657008 A CN201510657008 A CN 201510657008A CN 105169874 A CN105169874 A CN 105169874A
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- flue gas
- tower
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- smoke backflow
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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, particularly a kind of recirculate mixing promotes that condensation vapor removes the fine grain device and method of flue gas.
Background technology
Along with severe contamination appears in air in all parts of the country, PM2.5 is quick-fried table repeatedly, and PM refers to fine particle, and PM2.5 refers to that in air, aerodynamic diameter is less than or equal to the particle of 2.5 μm, and the daily seen haze of people is mostly all because PM2.5 causes.PM2.5 in air is mainly derived from the residue of the discharge through burning in the processes such as thermal power generation, industrial production, motor vehicle exhaust emission, these residues are mostly containing noxious materials such as heavy metals, PM2.5 grain diameter is little, surface area carries greatly that heavy metal is various and transmission range is long, brings very large injury to health.
Existing cleaner is extremely low for the removal efficiency of PM2.5 particle, causes a large amount of PM2.5 particles to enter atmospheric environment.Removal efficiency as electrostatic precipitator can reach 99%, but this removal efficiency is only for bulky grain thing, not high to fine grain removal efficiency, and sharply declines along with its removal efficiency of reduction of particle diameter.Currently remove fine grain research direction mainly at the agglomeration techniques of particle, research direction main at present has: acoustic agglomeration, coagulation also, chemical agglomeration, the technology such as steam phase transformation.Steam phase transformation promotes that the principle of Fine Particles technology is: enter steam supersaturated environments containing fine grain flue gas, steam take fine grained as the surface condensation of core at particle, impel fine grained to grow up into dust-laden drop, then utilize traditional cleaner to remove dust-laden drop.Steam phase change technique promotes that the grow up research of technology of fine grained has had a century nearly, but still some is less and can not be trapped by cleaner to be through fine grained particle diameter that steam phase transformation grows up, what at present promote fine grained to grow up technical research for steam phase transformation mainly concentrates on the condensation growth how promoting steam on fine grained surface, and there is not yet bibliographical information for the promotion method of dust-laden drop coalescence after condensation.
Summary of the invention
Goal of the invention: for solving the problems of the technologies described above, the present invention proposes a kind of recirculate mixing and promotes that condensation vapor removes the fine grain device and method of flue gas, fortified water vapour phase can become and promote fine grained coalescence in flue gas, promote fine particle grow up so that can efficient removal.
Technical scheme: object of the present invention is realized by following scheme:
A kind of recirculate mixing promotes that condensation vapor removes the fine grain device of flue gas, it is characterized in that, comprise and remove tower, remove tower bottom and be provided with gas approach 1, gas approach 1 one end is stretched out and is removed tower bottom, the other end be positioned at remove Ta Nei and height higher than removing tower bottom, remove top of tower and be provided with neat stress outlet 2, the central axis of gas approach 1 and neat stress outlet 2 with remove tower central axis and coincide; Be provided with flushing water system 3 below neat stress outlet 2, the cloth water area of flushing water system 3 is equal with removing tower cross-sectional area; Be provided with mesh mist eliminator 4 below flushing water system 3, mesh mist eliminator 4 is for the droplet removal efficiency of more than 3 μm up to 98%, and the cross-sectional area of mesh mist eliminator 4 is equal with removing tower cross-sectional area; Remove tower outer wall side and be provided with smoke backflow pipe, smoke backflow pipe is made up of hydrophobic material, comprise reflux inlet 6, flue gas input section 7, smoke backflow section 8, flue gas deferent segment 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 positioned at and removes below tower demister 4, its central axis with remove tower central axis and coincide; One end of flue gas input section 7 is stretched into remove in tower and is connected with reflux inlet 6 by a rounded bend pipeline, and the other end is stretched out and removes tower and be 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 controlled value 11, controlling smoke backflow flow is the 5-20% that gas approach enters smoke which, the lower port of smoke backflow section 8 is connected with one end of flue gas deferent segment 9 by a rounded bend pipe, the other end of flue gas deferent segment 9 is connected with bypass outlet 14, and bypass outlet 14 is arranged on and removes on the sidewall of tower middle and lower part; Smoke backflow pipe is positioned at its outer surface of part removed outside tower and is provided with heat-insulation layer 10, for preventing the water-drop evaporation condensing in particle surface to wall; Remove tower outer wall both sides and be equipped with steam inlet 5, steam inlet 5 is arranged on below bypass outlet 14, is 30 ~ 50 ㎝ with the vertical range of bypass outlet 14; Be provided with discharging of waste liquid pipe 12 between gas approach 1 and steam inlet 5, discharging of waste liquid pipe 12 mouth of pipe is connected to discharging of waste liquid valve 13.
Preferably, described heat-insulation layer 10 comprises rock wool liner and the outsourcing of aluminium skin.
Preferably, described flushing water system 3 comprises flushing water distributor, flushing water water inlet pipe and flushing water drain valve, is circular slab bottom flushing water distributor, and circular slab area is equal with removing tower cross-sectional area, circular slab is evenly distributed with water distributing pore, and pore diameter range is 0.1 ~ 1mm.
The present invention also proposes a kind of recirculate mixing and promotes that condensation vapor removes the fine grain method of flue gas, comprises the following steps:
(1) steam enters from the steam inlet 5 removing tower both sides, makes to remove in tower to reach steam supersaturated condition;
(2), under the supersaturated condition formed at steam, to enter from gas approach 1 containing fine grain flue gas and remove tower, steam forms the drop containing particle in fine grain surface condensation;
(3) while step 2 is implemented, the smoke backflow flow in smoke backflow pipe is made to be about the 5-20% that gas approach enters smoke which by adjustment backflow controlled value 11, by the backflow effect of smoke backflow pipe, what remove the part in tower gets back to containing particle droplet the bottom removing tower by smoke backflow pipe, coalescence is collided containing particle droplet, discharging from discharging of waste liquid pipe 12 containing particle-liquid after coalescence with newly-generated; A part is containing particle droplet along with flue gas removes through mesh mist eliminator 4 in addition, and last neat stress is discharged from the outlet removing tower;
(4) particle in flushing water system 3 pairs of mesh mist eliminators 4 rinses, and the waste liquid of flushing is flow into the bottom removing tower and discharged by discharging of waste liquid valve 13.
Concrete, describedly comprise flue gas containing PM2.5 containing fine grain flue gas.
Beneficial effect: compared with prior art, the present invention has the following advantages:
(1) present invention process is simple, arranges in the both sides external removing tower increase and the efficient removal that steam inlet and smoke backflow pipe can realize fine particle.
(2) have employed smoke backflow pipe, the coalescence of fine grained drop is contained under effectively can promoting steam phase change conditions, improve fine grain effect of growing up under steam phase change conditions, overcome the defect that final diameter that fine grained under steam phase change conditions grows up is not enough to be removed.
Accompanying drawing explanation
Fig. 1 is that a kind of recirculate mixing that the present invention proposes promotes that condensation vapor removes the structure chart of the fine grain device of flue gas;
Fig. 2 is the structure chart of smoke backflow pipe of the present invention;
Fig. 3 is coalescence mechanism of action schematic diagram of the present invention.
In figure, 1, gas approach, 2, neat stress outlet, 3, flushing 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, particle, 16, particle surface condensation dropping liquid.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further described.
A kind of recirculate mixing being illustrated in figure 1 the present invention's proposition promotes that condensation vapor removes the structure chart of the fine grain device of flue gas, Figure 2 shows that the structure chart of smoke backflow pipe of the present invention, by Fig. 1, Fig. 2 is known, a kind of recirculate mixing that the present invention proposes promotes that condensation vapor removes the fine grain device of flue gas, this device comprises and removes tower, remove tower bottom and be provided with gas approach 1, gas approach 1 one end is stretched out and is removed tower bottom, the other end be positioned at remove Ta Nei and height higher than removing tower bottom, remove top of tower and be provided with neat stress outlet 2, the central axis of gas approach 1 and neat stress outlet 2 with remove tower central axis and coincide, be provided with flushing water system 3 below neat stress outlet 2, the cloth water area of flushing water system 3 is equal with removing tower cross-sectional area, be provided with mesh mist eliminator 4 below flushing water system 3, mesh mist eliminator 4 is for the droplet removal efficiency of more than 3um up to 98%, and the cross-sectional area of mesh mist eliminator 4 is equal with removing tower cross-sectional area, remove tower outer wall side and be provided with smoke backflow pipe, smoke backflow pipe is made up of hydrophobic material, comprise reflux inlet 6, flue gas input section 7, smoke backflow section 8, flue gas deferent segment 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 positioned at and removes below tower mesh mist eliminator 4, its central axis with remove tower central axis and coincide, one end of flue gas input section 7 is stretched into remove in tower and is connected with reflux inlet 6 by a rounded bend pipeline, and the other end is stretched out and removes tower and be 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 controlled value 11, controlling smoke backflow flow is the 5-20% that gas approach enters smoke which, the lower port of smoke backflow section 8 is connected with one end of flue gas deferent segment 9 by a rounded bend pipe, the other end of flue gas deferent segment 9 is connected with bypass outlet 14, and bypass outlet 14 is arranged on and removes on the sidewall of tower middle and lower part, smoke backflow pipe is positioned at its outer surface of part removed outside tower and is provided with heat-insulation layer 10, for preventing the water-drop evaporation condensing in particle surface to wall, remove tower outer wall both sides and be equipped with steam inlet 5, steam inlet 5 is arranged on below bypass outlet 14, is 30 ~ 50 ㎝ with the vertical range of bypass outlet 14, be provided with discharging of waste liquid pipe 12 between gas approach 1 and steam inlet 5, 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 comprises rock wool liner and the outsourcing of aluminium skin; Flushing water system 3 in said apparatus comprises flushing water distributor, flushing water water inlet pipe and flushing water drain valve, it is circular slab bottom flushing water distributor, circular slab area is equal with removing tower cross-sectional area, and circular slab is evenly distributed with water distributing pore, and pore diameter range is 0.1 ~ 1mm.
It is as follows to subtractive process fine grain in flue gas that the recirculate mixing that the present invention proposes promotes that condensation vapor removes the fine grain device of flue gas:
After entering containing fine grain flue gas remove tower from gas approach 1, under the supersaturated environments effect that the steam injected is formed, steam can be the drop that core forms containing particle with particle, as shown in accompanying drawing 3 left hand view; Form the oversaturated condition of steam for making to remove in tower, the steam addition inputted from steam inlet 5 is determined by exhaust gas volumn, and the addition of quantity of steam is about 1.2 for making the moisture degree of supersaturation of flue gas.A dust-laden drop part enters smoke backflow pipe from reflux inlet 6, enters remove tower along smoke backflow section from bypass outlet 14, and the newly-generated collision Caragana seed pests contained between particle droplet, and its mechanism as shown in Figure 3; Another part dust-laden drop removes through mesh mist eliminator 4 along with flue gas, and last neat stress is discharged from the neat stress outlet 2 removing tower.Particle in flushing water system 3 pairs of mesh mist eliminators 4 carries out regular flushing, and the waste liquid of flushing flow into the bottom removing tower.Gas approach 1, at the 15 ~ 30cm higher than the lower limb removing tower that remove the port height in tower, can prevent waste liquid from flowing into gas approach 1 like this, be provided with discharging of waste liquid pipe 12 and discharging of waste liquid valve 13, can discharge the waste liquid of flushing in the bottom removing tower.
The structure of smoke backflow pipe as shown in Figure 2, smoke backflow pipe is made up of the material of good, the resistance to temperature of hydrophobicity 150 DEG C, 3 place's elbows of smoke backflow pipe are all avoided using elbow bend, adopt fillet elbow to reduce smoke flow resistance, being positioned at smoke backflow pipe the pipeline external removed outside tower arranges heat-insulation layer to prevent from condensing in the water-drop evaporation of particle surface to smoke backflow tube wall face simultaneously.The reflux inlet 6 of smoke backflow pipe is arranged on and removes on tower inside center axis, bypass outlet 14 is arranged on and removes on the middle and lower part side wall surface of tower, it is vertical with removing tower axis direction that the flue gas refluxed enters the direction removing tower, the momentum of flue gas itself can be utilized like this carry out and reflux thus add pump to make smoke backflow without the need to increasing, change the evaporation that flue gas pressures state causes particle surface drop.In order to make the flue gas of backflow have enough momentum, smoke backflow flow is about the 5-20% that gas approach enters smoke which, carries out flue gas flow adjustment by backflow controlled value 11.
In order to strengthen heat insulation effect, described heat-insulation layer comprises rock wool liner and the outsourcing of aluminium skin.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a recirculate mixing promotes that condensation vapor removes the fine grain device of flue gas, it is characterized in that, comprise and remove tower, remove tower bottom and be provided with gas approach (1), gas approach (1) one end is stretched out and is removed tower bottom, the other end be positioned at remove Ta Nei and height higher than removing tower bottom, remove top of tower and be provided with neat stress outlet (2), the central axis of gas approach (1) and neat stress outlet (2) and remove tower central axis and coincide; Neat stress outlet (2) below is provided with flushing water system (3), and the cloth water area of flushing water system (3) is equal with removing tower cross-sectional area; Flushing water system (3) below is provided with mesh mist eliminator (4), and its cross-sectional area is equal with removing tower cross-sectional area; Remove tower outer wall side and be provided with smoke backflow pipe, smoke backflow pipe is made up of hydrophobic material, comprise reflux inlet (6), flue gas input section (7), smoke backflow section (8), flue gas deferent segment (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 positioned at and removes tower mesh mist eliminator (4) below, its central axis with remove tower central axis and coincide; One end of flue gas input section (7) is stretched into remove in tower and is connected with reflux inlet (6) by a rounded bend pipeline, and the other end is stretched out and removes tower and be connected by the upper port of a rounded bend pipeline with smoke backflow section (8); The point midway of smoke backflow section (8) is provided with backflow controlled value (11), controlling smoke backflow flow is the 5-20% that gas approach enters smoke which, the lower port of smoke backflow section (8) is connected with one end of flue gas deferent segment (9) by a rounded bend pipe, the other end of flue gas deferent segment (9) is connected with bypass outlet (14), and bypass outlet (14) is arranged on and removes on the sidewall of tower middle and lower part; Smoke backflow pipe is positioned at its outer surface of part removed outside tower and is provided with heat-insulation layer (10), for preventing the water-drop evaporation condensing in particle surface to wall; Remove tower outer wall both sides and be equipped with steam inlet (5), steam inlet (5) are arranged on bypass outlet (14) below, are 30 ~ 50 ㎝ with the vertical range of bypass outlet (14); Be provided with discharging of waste liquid pipe (12) between gas approach (1) and steam inlet (5), discharging of waste liquid pipe (12) mouth of pipe is connected to discharging of waste liquid valve (13).
2. a kind of recirculate mixing according to claim 1 promotes that condensation vapor removes the fine grain device of flue gas, and it is characterized in that, described heat-insulation layer (10) comprises rock wool liner and the outsourcing of aluminium skin.
3. a kind of recirculate mixing according to claim 1 promotes that condensation vapor removes the fine grain device of flue gas, it is characterized in that, described flushing water system (3) comprises flushing water distributor, flushing water water inlet pipe and flushing water drain valve, it is circular slab bottom flushing water distributor, circular slab area is equal with removing tower cross-sectional area, circular slab is evenly distributed with water distributing pore, and pore diameter range is 0.1 ~ 1mm.
4. recirculate mixing promotes that condensation vapor removes the fine grain method of flue gas, it is characterized in that, comprises the following steps:
(1) steam enters from the steam inlet (5) removing tower both sides, makes to remove in tower to reach steam supersaturated condition;
(2), under the supersaturated condition formed at steam, to enter from gas approach (1) containing fine grain flue gas and remove tower, steam forms the drop containing particle in fine grain surface condensation;
(3) while step (2) is implemented, the smoke backflow flow in smoke backflow pipe is made to be about the 5-20% that gas approach enters smoke which by adjustment backflow controlled value (11), by the backflow effect of smoke backflow pipe, what remove the part in tower gets back to containing particle droplet the bottom removing tower by smoke backflow pipe, coalescence is collided containing particle droplet, discharging from discharging of waste liquid pipe (12) containing particle-liquid after coalescence with newly-generated; A part is containing particle droplet along with flue gas removes through mesh mist eliminator (4) in addition, and last neat stress is discharged from the outlet removing tower;
(4) flushing water system (3) is rinsed the particle in mesh mist eliminator (4), and the waste liquid of flushing is flow into the bottom removing tower and discharged by discharging of waste liquid valve (13).
5. a kind of recirculate mixing according to claim 4 promotes that condensation vapor removes the fine grain method of flue gas, it is characterized in that, describedly comprises flue gas containing PM2.5 containing fine grain flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| 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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| 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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| CN105169874A true CN105169874A (en) | 2015-12-23 |
| CN105169874B 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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105817112A (en) * | 2016-04-20 | 2016-08-03 | 东南大学 | Dedusting pretreatment device and method based on vapor phase change coupled electric coalescence |
| 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 |
| CN113058371A (en) * | 2021-03-15 | 2021-07-02 | 东南大学 | Device and method for removing fine particulate matters by coupling reflux turbulence agglomeration with water vapor phase change |
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| 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 | 国家海洋局第三海洋研究所 | 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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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 | 国家海洋局第三海洋研究所 | 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105817112A (en) * | 2016-04-20 | 2016-08-03 | 东南大学 | Dedusting pretreatment device and method based on vapor phase change coupled electric coalescence |
| 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 |
| CN113058371A (en) * | 2021-03-15 | 2021-07-02 | 东南大学 | Device and method for removing fine particulate matters by coupling reflux turbulence agglomeration with water vapor phase change |
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