CN102059033A - Condensation agglomeration trapping method and device of ultrafine particulate matter in combustion gas - Google Patents

Condensation agglomeration trapping method and device of ultrafine particulate matter in combustion gas Download PDF

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Publication number
CN102059033A
CN102059033A CN 201010598462 CN201010598462A CN102059033A CN 102059033 A CN102059033 A CN 102059033A CN 201010598462 CN201010598462 CN 201010598462 CN 201010598462 A CN201010598462 A CN 201010598462A CN 102059033 A CN102059033 A CN 102059033A
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CN
China
Prior art keywords
particulate matter
condensation
combustion
gases
superfine particulate
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CN 201010598462
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Chinese (zh)
Inventor
孙巧群
朱卫兵
张小彬
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哈尔滨工程大学
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Priority to CN 201010598462 priority Critical patent/CN102059033A/en
Publication of CN102059033A publication Critical patent/CN102059033A/en

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Abstract

The invention provides a condensation agglomeration trapping method and device of an ultrafine particulate matter in a combustion gas. The method comprises the following steps of: atomizing water to realize temperature reduction and moistening on the smoke gas in which the dust is removed so that the relative humidity is more than 90 percent; reducing the temperature of the moistened smoke gas to 10-20 DEG C; forming a liquid film on the surface of the ultrafine particles when the ultrafine particulate matter exists in a condensation nucleus form in the temperature reduction process to realize the growth of the ultrafine particles; spraying and washing so that the smoke gas enters a spraying-and-washing device to form ultrafine particles of the liquid film by using a spraying liquid drop trapping surface; and circularly using the dust-containing liquid and feeding the liquid into an ash-water flushing system for comprehensive utilization after the particles are enriched to a certain extent. The invention can realize effective trapping of burning ultrafine particulate matters below Pm2.5-5, and the trapping ratio of the ultrafine particulate matter is up to 45-50 percent. Compared with the traditional method, the method has the advantage that the trapping ratio of the ultrafine particulate matter is greatly improved, and the method can be applied to the field of emission of ultrafine particulate matter generated by burning.

Description

The condensation reunion capture method and the device of superfine particulate matter in the combustion product gases

Technical field

What the present invention relates to is a kind of superfine particulate matter capture method, is specially a kind of method that captures by condensation realization flue gas superfine particulate matter, belongs to fume emission control technology field.The present invention also relates to a kind of superfine particulate matter capturing device.

Background technology

Current, China's atmospheric environment problem is still outstanding, and particularly atmosphere combined pollution problem is on the rise, and people's health and ecological environment security are caused potential threat, is having a strong impact on China's economic society harmonious development.Fine particulates (PM2.5) is meant particle diameter less than the particle below the 2.5 μ m (fine particulates just is meant superfine particulate matter), is comprehensive strong, regional atmosphere pollution that harm is serious, be mainly derived from produce with life process in direct discharging.Because the particle of separate sources, the ratio of fine particulates (PM2.5), particle diameter distribute may be different fully, the environmental effect that causes differs huge, brings environmental liability to share problems such as not clear, difficult management thus, is difficult to implement " those who created pollution to clearing it up " principle.In addition, because PM2.5 can float (reaching 15 years) for a long time, realize that by atmospheric circulation transnational conveying influences surrounding countries (as Japan) in atmosphere, cause the world opinion controversial issue, government's pressure is huge.How controlling with reducing fine particulates (PM2.5) discharge capacity is the key that thoroughly solves problems such as atmosphere combined pollution.

Ultra-fine grain to the human beings'health influence greatly.Very easily enter and be deposited on respiratory tract even lung by respiration, nuisance of carrier band also can induce an illness to the effect of human body toxigenicity on it.Ultra-fine grain can weaken ultraviolet radiation, thereby it is crooked sick occurred frequently to cause children's to arrest; In addition, ultraviolet ray is the primary armament that nature is killed airborne microorganisms such as bacterium, virus etc., the ultra-fine grain thick weather causes that surface layer is ultraviolet to be weakened, and makes the increased activity of infectiousness germ in the air, may cause disease popularity when causing resistance of human body to descend.

Existing prior art generally adopts the mode of wet cottrell or static and sack cleaner associating to control the superfine particulate matter discharging that burning produces, and wet cottrell equipment input and operating cost are all too high, therefore are difficult to promote.A part of remnant oxygen is oxidized to ozone in the flue gas and the method that static and sack cleaner are united is because electrostatic precipitator can make, ozone can cause rear portion sack cleaner filtrate tendering of fiber, and then influence service life of sack cleaner, therefore technology is still very imperfect and ripe, and the unit of existing static and cloth bag cooperation does not pass through the continuous examination of the cycle of operation more than 2 years as yet.

Summary of the invention

The object of the present invention is to provide the condensation reunion capture method of superfine particulate matter in the high combustion product gases of a kind of equipment less investment, operating cost capture rate low, superfine particulate matter.The present invention also aims to provide the condensation reunion capturing device of superfine particulate matter in a kind of combustion product gases.

The object of the present invention is achieved like this:

The condensation reunion capturing device of superfine particulate matter comprises humidifying cooling device, condensation heat sink, the smoke eliminator of series connection successively in the combustion product gases of the present invention, be provided with the atomizing spray mechanism that smoke moisture is increased in the humidifying cooling device, the cooling body that the flue-gas temperature of making that has the condensation heat sink reduces, the inlet of smoke eliminator are positioned at that bottom, top are provided with the spray washing device, outlet is positioned at the top.

Cooling body in the described condensation heat sink is a cryogenic heat exchanger.

Cooling body in the described condensation heat sink is the Cryogenic air blender.

Between spray washing device in the smoke eliminator and the outlet demister is set.

Be connected with behind the smoke eliminator and concentrate the flocculation jar.

The condensation reunion capture method of superfine particulate matter is the condensation reunion capturing device that adopts superfine particulate matter in the combustion product gases of being made up of humidifying cooling device, condensation heat sink, the smoke eliminator of series connection successively in the combustion product gases of the present invention, be provided with the atomizing spray mechanism that smoke moisture is increased in the humidifying cooling device, the cooling body that the condensation heat sink has the flue-gas temperature of making to reduce, the inlet of smoke eliminator is positioned at the bottom, top is provided with the spray washing device;

Pending combustion product gases is introduced the humidifying cooling device and is carried out humidifying cooling, and its relative humidity is reached more than 90%;

Then will the flue gas behind the humidification introduce in the condensation heat sink and lower the temperature, make the flue-gas temperature behind the humidification reduce 10-20 ℃; When flue-gas temperature descends, water vapour in the flue gas condenses, in the condensation heat sink, it is the nuclei of condensation and several drops that condense that form one deck liquid film on the surface of superfine particulate matter with the superfine particulate matter that a part has formed, a part is from condensing into several drops, several condense drop and drops collide mutually, a large amount of superfine particulate matters are flocked together form than large nuclei;

The flue gas that contains condense drop and drop that condense drop and minority after growing up in a large number do not grow up enters in the smoke eliminator via smoke inlet and flows to last, the drop that condenses continues to grow up, in the spray washing device process of flowing through, spray the drop rain that gets off and descend by the spray washing device in the effect of gravity, make a large amount of dropping in the bottom of smoke eliminator, realized that the superfine particulate matter reunion captures in the combustion product gases than large nuclei.

The flue gas relative humidity of described humidifying cooling preferably reaches 95%.

Described cooling preferably makes the flue-gas temperature behind the humidification reduce by 15 ℃.

Also comprise the step that concentrates flocculation, reunion is trapped superfine particulate matter discharge the back from smoke eliminator and feed and concentrate the flocculation jar and concentrate flocculation.

Characteristics of the present invention are to make water fogging, and the flue gas after the dedusting is realized that decreasing temperature and increasing humidity makes its relative humidity surpass 90%; To the flue gas cool-down 10-20 behind the humidification ℃; Superfine particulate matter exists with nuclei of condensation form in the temperature-fall period, forms liquid film in the ultra-fine grain appearance, has realized growing up of ultra-fine grain; Spray washing, flue gas enter in the spray washing device, capture the ultra-fine grain of surface formation liquid film with the drop of spray; The circulation of dust-laden liquid is suitable for, and this liquid was sent into towards ash water system and fully utilized after particle was enriched to a certain degree.

The invention has the beneficial effects as follows:

The present invention has realized in the combustion product gases that by condensation superfine particulate matter captures, this method can realize burning effective capture of the following particle of superfine particulate matter Pm2.5-5.Through facts have proved, under equal conditions, utilize the inventive method to purify flue gas, the capture rate of superfine particulate matter can reach 45~50%, compares existing method, and the capture rate of superfine particulate matter has great raising.And the equipment input of the inventive method and operating cost are all lower, and environmental protection.The superfine particulate matter emission control field that the inventive method can be applied to burn and produce.

Description of drawings

Fig. 1 is a kind of embodiment structured flowchart of device of the present invention;

Fig. 2 is the another kind of embodiment structured flowchart of device of the present invention;

Fig. 3 is the schematic diagram of drop forming process that condenses.

The specific embodiment

For example the present invention is done more detailed description below in conjunction with accompanying drawing:

The specific embodiment one: shown in Fig. 1~3, the described a kind of method that captures by superfine particulate matter reunion in the condensation realization combustion product gases of present embodiment is: earlier by pending combustion product gases is carried out humidification, the condensation cooling realizes the formation of superfine particulate matter surface moisture, and then the particle diameter and the surface viscosity of increase ultra-fine grain, utilize the relatively large characteristics of water surface viscosity, mutual collision realization particle by the drop that condenses is further grown up, the big drop that will condense by the mode of auxiliary spray washing captures again, finally realizes the reduction of discharging of superfine particulate matter.

The specific embodiment two: shown in figure~3, the specific implementation process of the described method of present embodiment is:

Step 1, pending combustion product gases is carried out humidifying cooling earlier, its relative humidity is reached more than 90%;

Pending combustion product gases is fed in the work of water sprinkling for better material moisture Desuperheating device 1, fresh water (FW) mixes with the pending combustion product gases of heat in work of water sprinkling for better material moisture Desuperheating device 1 after atomizing, droplet after the pending combustion product gases of heat will atomize becomes water vapour, hydrone fully mixes with pending combustion product gases in work of water sprinkling for better material moisture Desuperheating device 1, and the relative humidity of controlling pending combustion product gases reaches more than 90%;

Step 2, then will the flue gas behind the humidification introduce in the condensation heat sink 2 and lower the temperature, make the flue-gas temperature behind the humidification reduce 10-20 ℃;

When flue-gas temperature descends, water vapour in the flue gas condenses, in flue gas is introduced condensation heat sink 2, it is the nuclei of condensation and several drops that condense that form one deck liquid film on the surface of superfine particulate matter with the superfine particulate matter that a part has formed, a part is from condensing into several drops, and several condense drop and drops collide mutually, under water surface and liquid film viscous effect, the major part drop that condenses is how much levels and grows up, and a large amount of superfine particulate matters is flocked together form than large nuclei;

Step 3, the combustion product gases that contains condense drop and drop that condense drop and minority after growing up in a large number do not grow up enter in the smoke eliminator 3 via smoke inlet 3-3 and flow to last, in smoke eliminator 3 in the flow process, the drop that condenses continues to grow up, in the spray washing device 3-2 process of flowing through, spray the drop rain that gets off and descend by spray washing device 3-2 in the effect of gravity, make a large amount of dropping in the bottom of smoke eliminator 3, realized that the superfine particulate matter reunion captures in the combustion product gases than large nuclei.Other composition and annexation are identical with the specific embodiment one.

In the present embodiment, come to wet containing of Self-duster or smoke eliminator the unsaturation flue gas by in the booster fan 5 feeding work of water sprinkling for better material moisture Desuperheating devices 1.

In the present embodiment, in capture district, smoke eliminator 3 bottom, can be provided with agitator 3-5.

In the present embodiment, will contain the drop flue gas that condenses and introduce in the spray washing device, realize collision, capture the drop that condenses by the drop of spray.Comprising the capture of spray droplet, comprise that also collision, the cohesion of condensing between drop capture to the drop that condenses.The liquid that has finally captured ultra-fine grain is sent into towards the ash water system utilization.This technology can be implemented at the superfine particulate matter trapping system of setting up separately, also can also can be achieved flue transformation at the flue horizontal segment.

The specific embodiment three: as shown in Figure 1, present embodiment is in step 2, and making flue-gas temperature behind the humidification reduce 10-20 ℃ is to adopt the cryogenic heat exchangers that are arranged in the condensation heat sink 2 to make near containing the further cooling of wet saturated flue gas.Vapourous water is condensed into aqueous water behind the flue gas cool-down, because the existence of ultra-fine grain, aqueous water at first shows formation at particle, cashes to particle surface moisture film to occur.Other composition and annexation are identical with the specific embodiment one.

The specific embodiment four: as shown in Figure 1, present embodiment is in step 2, and making flue-gas temperature behind the humidification reduce 10-20 ℃ is directly to sneak into Cryogenic air to realize flue gas cool-down in condensation heat sink 2.Vapourous water is condensed into aqueous water behind the flue gas cool-down, because the existence of ultra-fine grain, aqueous water at first shows formation at particle, cashes to particle surface moisture film to occur.Other composition and annexation are identical with the specific embodiment one.

The specific embodiment five: as shown in Figure 1, present embodiment makes the relative humidity of pending combustion product gases reach 95% in step 1; In step 2, make the flue-gas temperature behind the humidification reduce by 15 ℃.Vapourous water is condensed into aqueous water behind the flue gas cool-down, because the existence of ultra-fine grain, aqueous water at first shows formation at particle, cashes to particle surface moisture film to occur.Other composition and annexation are identical with the specific embodiment one.

The specific embodiment six: as shown in Figure 1, present embodiment is in step 3, and combustion product gases is from the bottom to top successively via being discharged by the purification exhanst gas outlet 3-4 of smoke eliminator 3 tops by spray washing device 3-2, demister 3-1 flue gas after being purified.Other composition and annexation are identical with the specific embodiment one, two, three, four or five.

The specific embodiment seven: as shown in Figure 1, the described method of present embodiment also comprises the step of concentrated flocculation: reunion is trapped the concentrated flocculation jar 4 of superfine particulate matter discharge back feeding concentrate flocculation.Other composition and annexation are identical with the specific embodiment six.

The specific embodiment eight: as shown in Figure 2, present embodiment is described a kind of by in the method that the superfine particulate matter reunion captures in the condensation realization combustion product gases, pending flue gas is the flue gas through wet desulphurization (by warm therapy cigarette desulfurizer 6), the humidifying cooling that need not to carry out again flue gas is handled, as long as the relative humidity of the flue gas that control is come out from warm therapy cigarette desulfurizer 6 reaches more than 90%; By booster fan 5 pending flue gas is fed in the warm therapy cigarette desulfurizer 6, introduce in the condensation heat sink 2 again, other later step is identical with above-mentioned embodiment.

Reference numeral 7 is the liquid circulation among Fig. 1, and Reference numeral 8 is a concentration; Dotted arrow in the smoke eliminator is represented the flow direction of flue gas, and solid arrow is represented nuclei of condensation falling direction; Reference numeral 7 is the liquid circulation among Fig. 2, and Reference numeral 8 is a concentration, and the dotted arrow in the smoke eliminator is represented the flow direction of flue gas, and solid arrow is represented nuclei of condensation falling direction; A represents that liquid film, B represent that the nuclei of condensation also are superfine particulate matter among Fig. 3.

Claims (10)

1. the condensation reunion capturing device of superfine particulate matter in the combustion product gases, the humidifying cooling device, condensation heat sink, the smoke eliminator that comprise series connection successively, it is characterized in that: be provided with the atomizing spray mechanism that smoke moisture is increased in the humidifying cooling device, the cooling body that the flue-gas temperature of making that has the condensation heat sink reduces, the inlet of smoke eliminator are positioned at that bottom, top are provided with the spray washing device, outlet is positioned at the top.
2. the condensation reunion capturing device of superfine particulate matter in the combustion product gases according to claim 1 is characterized in that: be connected with behind the smoke eliminator and concentrate the flocculation jar.
3. the condensation reunion capturing device of superfine particulate matter in the combustion product gases according to claim 2 is characterized in that: the cooling body in the described condensation heat sink is a cryogenic heat exchanger.
4. the condensation reunion capturing device of superfine particulate matter in the combustion product gases according to claim 2 is characterized in that: the cooling body in the described condensation heat sink is the Cryogenic air blender.
5. according to the condensation reunion capturing device of superfine particulate matter in any one described combustion product gases of claim 1-4, it is characterized in that: between spray washing device in the smoke eliminator and the outlet demister is set.
6. the condensation reunion capture method of superfine particulate matter in the combustion product gases, it is characterized in that: the condensation reunion capturing device that adopts superfine particulate matter in the combustion product gases of forming by humidifying cooling device, condensation heat sink, the smoke eliminator of series connection successively, be provided with the atomizing spray mechanism that smoke moisture is increased in the humidifying cooling device, the cooling body that the condensation heat sink has the flue-gas temperature of making to reduce, the inlet of smoke eliminator is positioned at the bottom, top is provided with the spray washing device;
Pending combustion product gases is introduced the humidifying cooling device and is carried out humidifying cooling, and its relative humidity is reached more than 90%;
Then will the flue gas behind the humidification introduce in the condensation heat sink and lower the temperature, make the flue-gas temperature behind the humidification reduce 10-20 ℃; When flue-gas temperature descends, water vapour in the flue gas condenses, in the condensation heat sink, it is the nuclei of condensation and several drops that condense that form one deck liquid film on the surface of superfine particulate matter with the superfine particulate matter that a part has formed, a part is from condensing into several drops, several condense drop and drops collide mutually, a large amount of superfine particulate matters are flocked together form than large nuclei;
The flue gas that contains condense drop and drop that condense drop and minority after growing up in a large number do not grow up enters in the smoke eliminator via smoke inlet and flows to last, the drop that condenses continues to grow up, in the spray washing device process of flowing through, spray the drop rain that gets off and descend by the spray washing device in the effect of gravity, make a large amount of dropping in the bottom of smoke eliminator, realized that the superfine particulate matter reunion captures in the combustion product gases than large nuclei.
7. according to the condensation reunion capture method of superfine particulate matter in claim 6 combustion product gases, it is characterized in that: the flue gas relative humidity of described humidifying cooling reaches 95%.
8. according to the condensation reunion capture method of superfine particulate matter in claim 6 or 7 combustion product gases, it is characterized in that: described cooling preferably makes the flue-gas temperature behind the humidification reduce by 15 ℃.
9. according to the condensation reunion capture method of superfine particulate matter in claim 6 or 7 combustion product gases, it is characterized in that: also comprise the step that concentrates flocculation, reunion is trapped superfine particulate matter discharge the back from smoke eliminator and feed and concentrate the flocculation jar and concentrate flocculation.
10. the condensation reunion capture method of superfine particulate matter in the combustion product gases according to Claim 8 is characterized in that: also comprise the step that concentrates flocculation, reunion is trapped superfine particulate matter discharge the back from smoke eliminator and feed and concentrate the flocculation jar and concentrate flocculation.
CN 201010598462 2010-12-21 2010-12-21 Condensation agglomeration trapping method and device of ultrafine particulate matter in combustion gas CN102059033A (en)

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Cited By (9)

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Publication number Priority date Publication date Assignee Title
CN102767837A (en) * 2012-07-24 2012-11-07 西安交通大学 System for recovering water contained in flue gas and synchronously removing PM2.5 (Particulate Matter)
CN104707432A (en) * 2015-03-11 2015-06-17 高境 System and method for synergistically removing dust and condensable particles in flue gas
CN104771996A (en) * 2015-04-17 2015-07-15 杭州兴环科技开发有限公司 Efficient and anticorrosive tail gas purification method and efficient and anticorrosive tail gas purification system with temperature-regulating and conditioning functions
CN105964087A (en) * 2016-06-08 2016-09-28 孙中强 System and method for reducing PM2.5 generated by flue gas
CN106076052A (en) * 2016-07-20 2016-11-09 武汉工程大学 A kind of atomizing air cleaning system
CN106110853A (en) * 2016-08-29 2016-11-16 西安热工研究院有限公司 The system and method for wet desulphurization device phase transformation reunion cooperation-removal fine particle
CN107638759A (en) * 2017-09-20 2018-01-30 华北理工大学 A kind of atmosphere pollution processing equipment
CN109745800A (en) * 2019-01-25 2019-05-14 江苏师范大学 Dedusting system
CN111102602A (en) * 2019-12-04 2020-05-05 重庆大学 Flue device for reducing emission of fine particulate matters in flue gas of civil heating stove based on phase change agglomeration and wet dust removal

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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
CN101445852A (en) * 2007-11-28 2009-06-03 中国京冶工程技术有限公司 Converter gas wet cooling and dedusting method
CN101884873A (en) * 2010-06-30 2010-11-17 邵波 Process and facility for dedusting and removing exhaust gas

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US3923956A (en) * 1972-11-13 1975-12-02 Bowman Enterprises Inc Smokeless anti-toxic burner method
US4113453A (en) * 1977-06-28 1978-09-12 Rector Charles B Anti-pollution device for industrial stacks
CN2045670U (en) * 1989-03-22 1989-10-11 个旧市矿产加工总厂 Wet dust collector
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
CN101445852A (en) * 2007-11-28 2009-06-03 中国京冶工程技术有限公司 Converter gas wet cooling and dedusting method
CN101884873A (en) * 2010-06-30 2010-11-17 邵波 Process and facility for dedusting and removing exhaust gas

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102767837A (en) * 2012-07-24 2012-11-07 西安交通大学 System for recovering water contained in flue gas and synchronously removing PM2.5 (Particulate Matter)
CN102767837B (en) * 2012-07-24 2015-01-07 西安交通大学 System for recovering water contained in flue gas and synchronously removing PM2.5 (Particulate Matter)
CN104707432A (en) * 2015-03-11 2015-06-17 高境 System and method for synergistically removing dust and condensable particles in flue gas
CN104771996A (en) * 2015-04-17 2015-07-15 杭州兴环科技开发有限公司 Efficient and anticorrosive tail gas purification method and efficient and anticorrosive tail gas purification system with temperature-regulating and conditioning functions
CN105964087A (en) * 2016-06-08 2016-09-28 孙中强 System and method for reducing PM2.5 generated by flue gas
CN105964087B (en) * 2016-06-08 2019-05-07 孙中强 A kind of system and method for reducing flue gas and generating PM2.5
CN106076052A (en) * 2016-07-20 2016-11-09 武汉工程大学 A kind of atomizing air cleaning system
CN106110853A (en) * 2016-08-29 2016-11-16 西安热工研究院有限公司 The system and method for wet desulphurization device phase transformation reunion cooperation-removal fine particle
CN107638759A (en) * 2017-09-20 2018-01-30 华北理工大学 A kind of atmosphere pollution processing equipment
CN109745800A (en) * 2019-01-25 2019-05-14 江苏师范大学 Dedusting system
CN111102602A (en) * 2019-12-04 2020-05-05 重庆大学 Flue device for reducing emission of fine particulate matters in flue gas of civil heating stove based on phase change agglomeration and wet dust removal

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Application publication date: 20110518