CN103230717B - A kind of steam phase transformation condensation promotes the device that PM2.5 fine particle removes - Google Patents

A kind of steam phase transformation condensation promotes the device that PM2.5 fine particle removes Download PDF

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Publication number
CN103230717B
CN103230717B CN201310150551.1A CN201310150551A CN103230717B CN 103230717 B CN103230717 B CN 103230717B CN 201310150551 A CN201310150551 A CN 201310150551A CN 103230717 B CN103230717 B CN 103230717B
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China
Prior art keywords
tower
steam
remove
fine particle
removes
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CN201310150551.1A
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Chinese (zh)
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CN103230717A (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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Priority to CN201310150551.1A priority Critical patent/CN103230717B/en
Publication of CN103230717A publication Critical patent/CN103230717A/en
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Publication of CN103230717B publication Critical patent/CN103230717B/en

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Abstract

The invention provides a kind of steam phase transformation condensation and promote the device that PM2.5 fine particle removes, comprise one group connect successively remove tower, described in remove that tower bottom is provided with smoke inlet, top is provided with exhanst gas outlet, sidewall is provided with steam inlet.This apparatus structure is simple, with low cost, by arrange one group connect successively remove tower, effective control the degree of supersaturation removing tower, thus progressively remove PM2.5 fine particle in gas, efficiency is high, energy consumption is low.

Description

A kind of steam phase transformation condensation promotes the device that PM2.5 fine particle removes

Technical field

The invention belongs to the technical field removing fine particle in flue gas, particularly a kind of device removed by steam phase transformation condensation promotion PM2.5 fine particle.

Background technology

PM2.5 refers to the fine grained that aerodynamic diameter is less than 2.5m, although PM2.5 is the component that in earth atmosphere composition, content is little, it has important impact to air quality and visibility etc.Verified, PM2.5 is the major reason causing haze weather.Research discovery is every runs into haze weather, and the outpatient service number of patient just increases by 10% to 15%, and Zhong Nanshan academician represents that PM2.5 by the lung of respiratory tract to intelligent, can bring out lung's sclerosis, asthma and bronchitis, even cause angiocardiopathy.The more important thing is owing to having adsorbed a lot of harmful and noxious material in PM2.5, enter blood by alveolar, directly damage health.And due to the particle in PM2.5 very little, surface area is large, and the harmful substance of absorption is many, very serious to the harm of health.Epidemiology and toxicologic research all confirm that the impact of PM2.5 on health is obviously, and had science data to prove, the generation of PM2.5 and the disease such as lung cancer, asthma is closely related.

The main cause causing PM2.5 fine particle in air to pollute be Chinese energy based on coal, coal burning directly discharges the less primary particle of a large amount of particle diameter.So how efficient, the task of removing PM2.5 of low energy consumption is extremely urgent.Lot of domestic and international research shows that steam phase transforming condensation promotes that removing of PM2.5 fine particle is one of the most effective mode, but the existing removal effect of the device of steam phase transforming promotion PM2.5 that utilizes is unsatisfactory, and the quantity of steam expended is larger.So need a kind of removing device to improve and utilize steam phase transforming to promote the efficiency that removes of PM2.5 newly.

Summary of the invention

Goal of the invention: the steam phase transformation condensation that the object of this invention is to provide a kind of efficiency high promotes the device that PM2.5 fine particle removes.

Technical scheme: the invention provides a kind of steam phase transformation condensation and promote the device that PM2.5 fine particle removes, comprise one group connect successively remove tower, described in remove that tower bottom is provided with smoke inlet, top is provided with exhanst gas outlet, sidewall is provided with steam inlet.

As preferably, described one group of quantity removing tower is two, be respectively first to remove tower and second and remove tower, described first exhanst gas outlet removing tower is connected with the second smoke inlet removing tower, eachly removes that tower bottom is provided with smoke inlet, top is provided with exhanst gas outlet, sidewall is provided with steam inlet.

As further improvement, each quantity removing steam inlet on tower is two, is relatively located at and removes on the sidewall of tower.

As further improvement, steam inlet is provided with valve, so that control the addition of steam.

Beneficial effect: steam phase transformation condensation provided by the invention promotes that the apparatus structure that PM2.5 fine particle removes is simple, with low cost, by arrange one group connect successively remove tower, effective control removes the degree of supersaturation of tower, thus progressively removing PM2.5 fine particle in gas, efficiency is high, energy consumption is low.

Accompanying drawing explanation

Fig. 1 is the structural representation that steam phase transformation of the present invention condensation promotes the device that PM2.5 fine particle removes.

Fig. 2 first removes tower profile.

Fig. 3 is the structural representation after fine particle and steam condensation.

Detailed description of the invention

Below in conjunction with accompanying drawing, steam phase transformation condensation of the present invention is promoted that the device that PM2.5 fine particle removes further illustrates, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.

Steam phase transformation condensation promotes the device that PM2.5 fine particle removes, and sees Fig. 1 and Fig. 2, comprise be connected to each other first remove tower 1 and second and remove tower 2; Eachly remove that tower bottom is equipped with smoke inlet (11,21), top is provided with exhanst gas outlet (12,22), each sidewall removing tower is provided with respectively relatively two steam inlets (13,23); Eachly remove that tower bottom is equipped with smoke inlet (11,21), top is provided with exhanst gas outlet (12,22), each sidewall removing tower is provided with respectively relatively two steam inlets (13,23); The smoke inlet 11 that described first exhanst gas outlet 12 and second removing tower 1 removes tower 2 is connected; Steam inlet is provided with valve.

The heterogeneous condensation critical saturation S of steam needed for fine grained surface condensation under certain pressure and temperature can be calculated according to Fletcher heterogeneous nucleation theory and Kelvin equation cr hetwith homophase condensation critical saturation S cr hom.Improve the speed that saturation degree can improve heterogeneous condensation, but the speed that too high saturation degree then can cause the homophase between steam and steam to condense, expend more quantity of steam.The present invention then effectively avoids this problem.Flue gas removes in tower 1 first and enters more weak supersaturated environments (saturation degree is S cr het<S 1<S cr hom) there is out-phase condensation; Then remove in tower 2 second and enter stronger supersaturated environments (saturation degree is S 2>S cr hom), there is homophase condensation.Wherein, S 1be the first saturation degree removing in tower 1, S 2be the second saturation degree removing in tower 2, S cr hetfor the heterogeneous condensation critical saturation of steam under certain pressure and temperature needed for fine grained surface condensation, S cr homthe homophase condensation critical saturation of steam under certain pressure and temperature.

Specifically, in use, the flue gas that factory (power plant) emits enters first and removes tower 1 this device, and the steam in the steam inlet 13 that the first a pair of removing tower 1 liquidates enters in tower from both sides, and removing structure saturation degree in tower 1 first is S cr het<S 1<S cr homsupersaturated environments, steam for core carries out heterogeneous phase transformation condensation on its surface, forms the appearance fine particle aqueous mixtures (see figure 3) that has water hull to wrap up with the PM2.5 fine particle in flue gas.The particle size range that traditional cleaner can remove has been reached at the first top part PM2.5 fine particle removing tower 1, but some fine grained is still smaller, need further to increase its particle diameter, and there is the existence of aqueous phase on the surface of these particles.Tower 2 is removed by passing into second by the first gas removed in tower 1, steam in the steam inlet 23 that second a pair of removing tower 2 liquidates enters in tower from both sides, the quantity of steam entered 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 build saturation degree in tower 2 be S 2>S cr homsupersaturated environments, but building a ratio first, to remove the large environment of tower 1 degree of supersaturation be carried out heterogeneous phase transformation particle diameter and the particle removing scope for reaching traditional cleaner carries out homogeneous phase phase transformation in the present context thus increases its diameter to make to remove in tower 1 first, finally leads to traditional cleaner and remove; That is, the first degree of supersaturation removing tower 1 removes tower 2 lower than second, and first removes 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 homabove.The employing mode of liquidating passes into steam, can build the supersaturated environments of a both sides balance, improve the condensation chance of steam and flue gas, thus reduce the consumption of steam in tower.The saturation degree range of choice of steam of the present invention is 1.1<S 1<2.5, S 2>2.5.

Claims (1)

1. steam phase transformation condensation promotes to it is characterized in that the device that PM2.5 fine particle removes: comprise one group connect successively remove tower, eachly remove that tower bottom is provided with smoke inlet, top is provided with exhanst gas outlet, sidewall is provided with steam inlet; Described one group of quantity removing tower is two, be respectively first to remove tower (1) and second and remove tower (2), eachly remove that tower bottom is provided with smoke inlet, top is provided with exhanst gas outlet, sidewall is provided with steam inlet, the smoke inlet that the described first exhanst gas outlet and second removing tower (1) removes tower (2) is connected; Each quantity removing steam inlet on tower is two, is relatively located at the side wall upper part removing tower; Steam inlet is provided with valve; Wherein, first to remove tower (1) saturation degree be S cr het<S 1<S cr hom, second to remove tower (2) saturation degree be S 2>S cr hom.
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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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105013270B (en) * 2015-06-24 2017-09-01 四川理工学院 A kind of PM2.5 method in multistage wet method removing industrial tail gas
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
CN105964405B (en) * 2016-05-31 2018-05-15 东南大学 One kind promotes wet electrical dust precipitator removing PM2.5Device and method

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US5176723A (en) * 1991-07-19 1993-01-05 Regents Of The University Of Minnesota Condensation-growth particle scrubber
CN101224367A (en) * 2007-10-26 2008-07-23 东南大学 Method of removing PM2.5 and gaseous pollutant using steam phase transition and device thereof
EP1955755A2 (en) * 2007-02-07 2008-08-13 Samuli Penttinen Method and device for purifying flue gas containing fine particles
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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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US5176723A (en) * 1991-07-19 1993-01-05 Regents Of The University Of Minnesota Condensation-growth particle scrubber
EP1955755A2 (en) * 2007-02-07 2008-08-13 Samuli Penttinen Method and device for purifying flue gas containing fine particles
CN101224367A (en) * 2007-10-26 2008-07-23 东南大学 Method of removing PM2.5 and gaseous pollutant using steam phase transition and device thereof
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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