CN103230717A - Device for accelerating desorption of PM2.5 (Particulate Matter 2.5) fine particulate matters by utilizing vapor phase change and condensation - Google Patents

Device for accelerating desorption of PM2.5 (Particulate Matter 2.5) fine particulate matters by utilizing vapor phase change and condensation Download PDF

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Publication number
CN103230717A
CN103230717A CN2013101505511A CN201310150551A CN103230717A CN 103230717 A CN103230717 A CN 103230717A CN 2013101505511 A CN2013101505511 A CN 2013101505511A CN 201310150551 A CN201310150551 A CN 201310150551A CN 103230717 A CN103230717 A CN 103230717A
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China
Prior art keywords
removes
tower
steam
desorption
fine particle
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CN2013101505511A
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Chinese (zh)
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CN103230717B (en
Inventor
张军
徐俊超
盛昌栋
周璐璐
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东南大学
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Abstract

The invention provides a device for accelerating desorption of PM2.5 (Particulate Matter 2.5) fine particulate matters by utilizing vapor phase change and condensation. The device comprises a group of desorption towers which are sequentially connected, wherein flue gas inlets are formed in the bottoms of the desorption towers, flue gas outlets are formed in the tops of the desorption towers, and stream inlets are formed in the side walls of the desorption towers. According to the device, the structure is simple, and the cost is low; and by arranging a group of the desorption towers which are sequentially connected, the supersaturation degrees of the desorption towers are effectively controlled, so that the PM2.5 fine particulate matters in the gas are desorbed step by step; and the efficiency is high, and the energy consumption is low.

Description

A kind of steam phase transformation is condensed and is promoted the device that the PM2.5 fine particle removes
Technical field
The invention belongs to the technical field that removes fine particle in the flue gas, particularly a kind of condensing by the steam phase transformation promotes the device that the PM2.5 fine particle removes.
Background technology
PM2.5 refers to aerodynamic diameter less than the fine grained of 2.5m, though PM2.5 is content component seldom in the earth atmosphere composition, it has significant effects to air quality and visibility etc.Verified, PM2.5 is the major reason that causes haze weather.Discover every grey haze weather that runs into, patient's outpatient service number just increases by 10% to 15%, and Zhong Nanshan academician represents that PM2.5 can bring out lung's sclerosis, asthma and bronchitis, even cause angiocardiopathy by the lung of respiratory tract to the intelligent.The more important thing is owing to adsorbed a lot of harmful and noxious materials among the PM2.5, enter blood by alveolar, directly damage health.And because the particle among the PM2.5 is very little, and surface area is big, the harmful substance of absorption is many, and is very serious to the harm of health.Epidemiology and toxicologic research confirm that all the health effects of PM2.5 is very tangible, have had science data to prove, the generation of diseases such as PM2.5 and lung cancer, asthma is closely related.
The main cause that causes PM2.5 fine particle in the atmosphere to pollute be China energy based on coal, coal burning is directly discharged the less primary particle of a large amount of particle diameters.So how efficient, the task of removing PM2.5 of low energy consumption is extremely urgent.Lot of domestic and international studies show that steam phase transforming condenses and promotes that removing of PM2.5 fine particle is one of effective and efficient manner, yet the existing removal effect of the device that steam phase transforming promotes PM2.5 that utilizes is unsatisfactory, and the quantity of steam that expends is bigger.So need a kind of new device that removes to improve the efficient of utilizing steam phase transforming promotion PM2.5 to remove.
Summary of the invention
Goal of the invention: the purpose of this invention is to provide the high steam phase transformation of a kind of efficient and condense and promote the device that the PM2.5 fine particle removes.
Technical scheme: the invention provides a kind of steam phase transformation and condense and promote the device that the PM2.5 fine particle removes, comprise one group connect successively remove tower, the described tower bottom that removes is provided with that smoke inlet, top are provided with exhanst gas outlet, sidewall is provided with the steam inlet.
As preferably, described one group of quantity that removes tower is two, being respectively first removes tower and second and removes tower, described first exhanst gas outlet that removes tower is connected with second smoke inlet that removes tower, and each removes tower bottom and is provided with that smoke inlet, top are provided with exhanst gas outlet, sidewall is provided with the steam inlet.
As further improvement, each quantity that removes steam inlet on the tower is two, is located at relatively on the sidewall that removes tower.
As further improvement, the steam inlet is provided with valve, so that the addition of control steam.
Beneficial effect: the steam phase transformation provided by the invention apparatus structure that promotes the PM2.5 fine particle to remove that condenses is simple, with low cost, by arrange one group connect successively remove tower, effectively control removes the degree of supersaturation of tower, thereby progressively remove PM2.5 fine particle in the gas, efficient height, energy consumption are low.
Description of drawings
Fig. 1 is the condense structural representation of the device that promotes that the PM2.5 fine particle removes of steam phase transformation of the present invention.
Fig. 2 first removes the tower profile.
Fig. 3 is the structural representation after fine particle and steam condense.
The specific embodiment
Below in conjunction with accompanying drawing the condense device that promotes the PM2.5 fine particle to remove of steam phase transformation of the present invention is made and being further specified, should understand these embodiment only is used for explanation the present invention and is not used in and limits the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims institute restricted portion to the modification of the various equivalent form of values of the present invention.
The steam phase transformation is condensed and is promoted the device that the PM2.5 fine particle removes, and sees Fig. 1 and Fig. 2, comprises that interconnected first removes tower 1 and second and remove tower 2; Each removes, and tower bottom is equipped with smoke inlet (11,21), the top is provided with exhanst gas outlet (12,22), and each removes on the sidewall of tower and is provided with two steam inlets (13,23) respectively relatively; Each removes, and tower bottom is equipped with smoke inlet (11,21), the top is provided with exhanst gas outlet (12,22), and each removes on the sidewall of tower and is provided with two steam inlets (13,23) respectively relatively; The smoke inlet 11 that described first exhanst gas outlet 12 and second that removes tower 1 removes tower 2 is connected; The steam inlet is provided with valve.
Theoretical and Kelvin equation can calculate under certain pressure and temperature steam at the required heterogeneous critical saturation S that condenses of fine grained surface condensation according to the Fletcher heterogeneous nucleation Cr HetWith the homophase critical saturation S that condenses Cr HomImprove saturation degree and can improve heterogeneous speed of condensing, but too high saturation degree then can cause the speed that the homophase between steam and the steam condenses, and expends more quantity of steam.The present invention has then effectively avoided this problem.Flue gas removes first and enters more weak supersaturated environments in the tower 1 (saturation degree is S Cr Het<S 1<S Cr Hom) out-phase takes place condense; Remove second then and enter stronger supersaturated environments in the tower 2 (saturation degree is S 2S Cr Hom), homophase takes place to be condensed.Wherein, S 1Be first to remove the saturation degree in the tower 1, S 2Be second to remove the saturation degree in the tower 2, S Cr HetFor steam under certain pressure and temperature at the required heterogeneous critical saturation of condensing of fine grained surface condensation, S Cr HomThe homophase of the steam critical saturation of condensing under certain pressure and temperature.
Particularly, this installs in use, and the flue gas that factory (power plant) emits enters first steam that removes in a pair of steam inlet that liquidates 13 that tower 1, the first removes tower 1 and enters in the tower from both sides, removes first that to make up saturation degree in the tower 1 be S Cr Het<S 1<S Cr HomSupersaturated environments, steam is that core is carried out heterogeneous phase transformation on its surface and condensed with the PM2.5 fine particle in the flue gas, forms the fine particle aqueous mixtures (see figure 3) that appearance has the water hull parcel.Reached the particle size range that traditional cleaner can remove at the first top part PM2.5 fine particle that removes tower 1, but some fine grained is still smaller, need further to increase its particle diameter, and the surface of these particles there is the existence of water.To remove tower 2 by the first gas feeding second that removes in the tower 1, second steam that removes in a pair of steam inlet that liquidates 23 of tower 2 enters in the tower from both sides, the quantity of steam that enters will to remove the quantity of steam of tower 1 many than entering first, also be conducive to fully contacting of steam and flue gas, remove second that to make up saturation degree in the tower 2 be S 2S Cr HomSupersaturated environments, thereby to remove the big environment of tower 1 degree of supersaturation be to have carried out heterogeneous phase transformation particle diameter in the tower 1 and carry out the homogeneous phase phase transformation increase its diameter under this environment for reaching particle that traditional cleaner removes scope in order to make to remove first but make up a ratio first, leads to traditional cleaner at last and remove; That is to say that first degree of supersaturation that removes tower 1 is lower than second and removes tower 2, the first and remove the degree of supersaturation of tower at S Cr HetAnd S Cr HomBetween, second removes the degree of supersaturation of tower 2 at S Cr HomMore than.The employing mode of liquidating feeds steam, can make up the supersaturated environments of a both sides balance in tower, improves the chance of condensing of steam and flue gas, thereby reduces the consumption of steam.The saturation degree range of choice of steam of the present invention is 1.1<S 1<2.5, S 22.5.

Claims (4)

1. a steam phase transformation is condensed and is promoted the device that the PM2.5 fine particle removes, and it is characterized in that: comprise one group connect successively remove tower, each removes tower bottom and is provided with that smoke inlet, top are provided with exhanst gas outlet, sidewall is provided with the steam inlet.
2. a kind of steam phase transformation according to claim 2 is condensed and is promoted the device that the PM2.5 fine particle removes, it is characterized in that: described one group of quantity that removes tower is two, being respectively first removes tower (1) and second and removes tower (2), each removes tower bottom and is provided with that smoke inlet, top are provided with exhanst gas outlet, sidewall is provided with the steam inlet, and the smoke inlet that described first exhanst gas outlet and second that removes tower (1) removes tower (2) is connected.
3. a kind of steam phase transformation according to claim 3 is condensed and is promoted the device that the PM2.5 fine particle removes, and it is characterized in that: each quantity that removes steam inlet on the tower is two, is located at the side wall upper part that removes tower relatively.
4. a kind of steam phase transformation according to claim 3 is condensed and is promoted the device that the PM2.5 fine particle removes, and it is characterized in that: the steam inlet is provided with valve.
CN201310150551.1A 2013-04-26 2013-04-26 A kind of steam phase transformation condensation promotes the device that PM2.5 fine particle removes CN103230717B (en)

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CN105013270A (en) * 2015-06-24 2015-11-04 四川理工学院 Method for multistage wet method removal of PM2.5 in industrial tail gas
CN105964405A (en) * 2016-05-31 2016-09-28 东南大学 Device and method for promoting wet-type electrostatic precipitator to remove PM2.5
CN106943829A (en) * 2016-01-06 2017-07-14 周午贤 A kind of air purification method

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CN102059029A (en) * 2010-11-25 2011-05-18 东南大学 Method and device for removing fine particles in high-humidity gas fume
CN102961943A (en) * 2012-11-27 2013-03-13 上海龙净环保科技工程有限公司 Method and device for synergistically removing fine particles via wet-process flue gas desulfurization
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CN102059029A (en) * 2010-11-25 2011-05-18 东南大学 Method and device for removing fine particles in high-humidity gas fume
CN102961943A (en) * 2012-11-27 2013-03-13 上海龙净环保科技工程有限公司 Method and device for synergistically removing fine particles via wet-process flue gas desulfurization
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105013270A (en) * 2015-06-24 2015-11-04 四川理工学院 Method for multistage wet method removal of PM2.5 in industrial tail gas
CN106943829A (en) * 2016-01-06 2017-07-14 周午贤 A kind of air purification method
CN106943829B (en) * 2016-01-06 2019-04-12 珠海安达净化工程有限公司 A kind of air purification method
CN105964405A (en) * 2016-05-31 2016-09-28 东南大学 Device and method for promoting wet-type electrostatic precipitator to remove PM2.5

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