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EP0977623A1 - Purification arrangement - Google Patents

Purification arrangement

Info

Publication number
EP0977623A1
EP0977623A1 EP98919696A EP98919696A EP0977623A1 EP 0977623 A1 EP0977623 A1 EP 0977623A1 EP 98919696 A EP98919696 A EP 98919696A EP 98919696 A EP98919696 A EP 98919696A EP 0977623 A1 EP0977623 A1 EP 0977623A1
Authority
EP
European Patent Office
Prior art keywords
flow
air
main flow
ionised
purification
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98919696A
Other languages
German (de)
French (fr)
Inventor
Yngve SÄWSTRÖM
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ekonomivarme I Skaraborg AB
Original Assignee
Ekonomivarme I Skaraborg AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ekonomivarme I Skaraborg AB filed Critical Ekonomivarme I Skaraborg AB
Publication of EP0977623A1 publication Critical patent/EP0977623A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor

Definitions

  • the present invention relates to a purifying arrangement for purifying of contaminated gaseous medium comprising an ionising equipment for ionising air and at least one ixing ⁇ chamber whereby the contaminated medium is fed through the mixing chamber in a main flow therethrough and ionised air is added to the main flow from the side.
  • a way to purify gaseous media from, for example, solvent- based gases, paints etc such as benzine, paraffin, propene and other hydrocarbons occurs by means of ionising.
  • the contaminated air is mixed with ionised air.
  • the charged particles cause the contaminating molecules to be combined and precipitated out.
  • An arrangement for exhaust gas purifying conforming with the preamble to the enclosed patent claims is for example known from AT 387 158 B whereby in a mixing chamber there is a main flow of contaminated air and a smaller flow of ionised air is added from the side.
  • the ionised air By feeding the ionised air into the mixing chamber with a velocity which substantially exceeds the flow velocity of the main flow the ionised air will quickly penetrate down into the main flow and thus the probability that a contami- nating molecule of the main flow shall be hit by an ionised particle is substantially increased.
  • the ionised air is supplied further via several successively arranged openings in the flow direction of the main flow. In this way said probability increases further and thereby also the degree of purification.
  • the ionised air is added to the main flow with a flow direction which has at least an angle of 40° in relation to the flow direction of the main flow.
  • a purification arrangement according to the invention comprises a supply pipe 1 for the supply of contaminated air, a purification part comprising three mixing chambers 2 and an outlet pipe 6 for removing of purified air.
  • a supply pipe 1 for the supply of contaminated air
  • a purification part comprising three mixing chambers 2 and an outlet pipe 6 for removing of purified air.
  • three mixing chambers 2 are used but of- course even other numbers, such as one or two can be used.
  • a main flow of contaminated air occurs. From the side, however, a further feed-flow of ionised air occurs.
  • This air is ionised in an ionising equipment 3 which comprises an electrically charged surface which by corona-discharges gives off electrons to the surrounding air.
  • This air which shall be ionised must be relatively clean (Air Quality 1) to allow ionising in a desired degree which, however, is the case with usual fresh air.
  • the air is conducted after it has been ionised via pipes 4 to openings 5 in the sidewalls of the mixing- chambers. Every mixing chamber is in this embodiment example provided with four openings 5 which are arranged successively after each other in the flow direction of the main flow.
  • openings are, however, all of course possible but it is preferable to have more than one opening per chamber. More inlet openings give a better mixing but at the same time the speed (and the amount of gas) of the main flow increases which makes the purification process more difficult downstream.
  • the flow velocity of the feeding ionised air is preferably appreciably much higher than the flow velocity of the main flow.
  • the velocity relationship is suitably at least 3/1 and preferably at least 5/1.
  • the velocity difference is important for allowing the ionised air to penetrate into the main flow. How great the optimal velocity relationship is will however depend on the contamination concentration and the density of the gas which is to be purified. Higher density means that the speed should be higher and lower density that the speed should be lower. Usually a velocity relation of about 10/1 is to be preferred.
  • the flow velocity of the ionised air should however be at least 0,5 m/s so that the laws of mass inertia shall be applicable instead of the gas laws. Further, there is an upper critical velocity which is dependent on the shape of the openings. This upper velocity limit depends however on the total pressure but is usually about 18 m/s.
  • the openings should further be arranged so that the direction of flow for the ionised air has an angle in relation to the flow direction of the main flow. This angle should be at least 40° and the addition of ionised air occurs preferably perpendicularly to the main flow. How great the angle should be depends however on the difference of density between the gases and the ionising energy.
  • the purification arrangement according to the invention further comprises a control system.
  • the control system comprises a sensor 8 and 9 for measuring the degree of contamination in the incoming contaminated air and the purified outgoing air respectively.
  • the difference between these values for example given as a purification degree in the form of incoming contamination amount minus outgoing contamination amount and divided with the incoming contamination amount, can later be used for conducting the purification arrangement.
  • the result from the sensors 8, 9 is therefore sent via conduits to the ionising equipment and is used for conducting the ionising degree and the flow velocity of the ionised air. Normally, an admixture of 20- 30% ionised air in the main flow is desirable.
  • the sensors may, for example, be commercially available photo-ionising instruments such as Photovac PID 2020 or Photovac 10S Plus. Further parameters can also be used for the regulation such as the direct amount of impurities in the starting-air, the number of ions in the outgoing air, etc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
  • Filtering Materials (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

The present invention relates to a purification arrangement for purification of a contaminated gaseous medium comprising an ionising equipment (3) for ionising air and at least one mixing chamber (2) wherein the contaminated medium is fed through the mixing chamber (2) in a main flow therethrough and ionised air is added to the main flow from the side. A main feature of the arrangement according to the invention is that the ionised air is fed into the mixing chamber with a flow velocity which substantially exceeds the flow velocity of the main flow.

Description

TITLE: PURIFICATION ARRANGEMENT
TECHNICAL FIELD:
The present invention relates to a purifying arrangement for purifying of contaminated gaseous medium comprising an ionising equipment for ionising air and at least one ixing^ chamber whereby the contaminated medium is fed through the mixing chamber in a main flow therethrough and ionised air is added to the main flow from the side.
BACKGROUND:
The demands on purifying affluents from industries and the like are becoming larger as environmental consciousness increases in society.
A way to purify gaseous media from, for example, solvent- based gases, paints etc such as benzine, paraffin, propene and other hydrocarbons occurs by means of ionising. In this form of purifying, the contaminated air is mixed with ionised air. The charged particles cause the contaminating molecules to be combined and precipitated out.
An arrangement for exhaust gas purifying conforming with the preamble to the enclosed patent claims is for example known from AT 387 158 B whereby in a mixing chamber there is a main flow of contaminated air and a smaller flow of ionised air is added from the side.
However, such a known arrangement is burdened with several problems. The most serious problem is that the cost for obtaining the desired degree of purification is far too large or that the desired degree of purification is not possible to obtain at all. OBJECT OF THE INVENTION
It is accordingly an object of the present invention to bring about a purification arrangement which is effective but still relatively cheap with regard to both investment costs and operation costs.
SUMMARY OF THE INVENTION
This object has been obtained by a purification arrangement according to claim 1.
By feeding the ionised air into the mixing chamber with a velocity which substantially exceeds the flow velocity of the main flow the ionised air will quickly penetrate down into the main flow and thus the probability that a contami- nating molecule of the main flow shall be hit by an ionised particle is substantially increased.
According to an aspect of the invention, the ionised air is supplied further via several successively arranged openings in the flow direction of the main flow. In this way said probability increases further and thereby also the degree of purification.
According to a further aspect of the invention the ionised air is added to the main flow with a flow direction which has at least an angle of 40° in relation to the flow direction of the main flow. By this means, the mixing is further improved.
SHORT DESCRIPTION OF THE DRAWINGS
The invention shall now, by way of example, be described more in detail by means of an embodiment example and in connection with the enclosed drawing which shows a schematical picture of a purification arrangement according to the invention. DESCRIPTION OF PREFERRED EMBODIMENT EXAMPLES A purification arrangement according to the invention comprises a supply pipe 1 for the supply of contaminated air, a purification part comprising three mixing chambers 2 and an outlet pipe 6 for removing of purified air. In the embodiment example three mixing chambers 2 are used but of- course even other numbers, such as one or two can be used.
Through the mixing chambers 2 a main flow of contaminated air occurs. From the side, however, a further feed-flow of ionised air occurs. This air is ionised in an ionising equipment 3 which comprises an electrically charged surface which by corona-discharges gives off electrons to the surrounding air. This air which shall be ionised must be relatively clean (Air Quality 1) to allow ionising in a desired degree which, however, is the case with usual fresh air. The air is conducted after it has been ionised via pipes 4 to openings 5 in the sidewalls of the mixing- chambers. Every mixing chamber is in this embodiment example provided with four openings 5 which are arranged successively after each other in the flow direction of the main flow. Other numbers of openings are, however, all of course possible but it is preferable to have more than one opening per chamber. More inlet openings give a better mixing but at the same time the speed (and the amount of gas) of the main flow increases which makes the purification process more difficult downstream.
The flow velocity of the feeding ionised air is preferably appreciably much higher than the flow velocity of the main flow. The velocity relationship is suitably at least 3/1 and preferably at least 5/1. The velocity difference is important for allowing the ionised air to penetrate into the main flow. How great the optimal velocity relationship is will however depend on the contamination concentration and the density of the gas which is to be purified. Higher density means that the speed should be higher and lower density that the speed should be lower. Usually a velocity relation of about 10/1 is to be preferred. The flow velocity of the ionised air should however be at least 0,5 m/s so that the laws of mass inertia shall be applicable instead of the gas laws. Further, there is an upper critical velocity which is dependent on the shape of the openings. This upper velocity limit depends however on the total pressure but is usually about 18 m/s.
The openings should further be arranged so that the direction of flow for the ionised air has an angle in relation to the flow direction of the main flow. This angle should be at least 40° and the addition of ionised air occurs preferably perpendicularly to the main flow. How great the angle should be depends however on the difference of density between the gases and the ionising energy.
The purification arrangement according to the invention further comprises a control system. The control system comprises a sensor 8 and 9 for measuring the degree of contamination in the incoming contaminated air and the purified outgoing air respectively. The difference between these values, for example given as a purification degree in the form of incoming contamination amount minus outgoing contamination amount and divided with the incoming contamination amount, can later be used for conducting the purification arrangement. The result from the sensors 8, 9 is therefore sent via conduits to the ionising equipment and is used for conducting the ionising degree and the flow velocity of the ionised air. Normally, an admixture of 20- 30% ionised air in the main flow is desirable. The sensors may, for example, be commercially available photo-ionising instruments such as Photovac PID 2020 or Photovac 10S Plus. Further parameters can also be used for the regulation such as the direct amount of impurities in the starting-air, the number of ions in the outgoing air, etc.
It is also an advantage to let the flow-pipe for the main flow expand before the mixing chambers, as occurs in the embodiment example, to thus decrease the flow velocity of the main flow through the mixing chambers.
It is further possible to combine the purification arrangement according to the invention with other types of purification such as filers of different kinds, etc. to further improve the purification effect in that way.
The invention has been described above by means of an embodiment example. It is however realised by a person skilled in the art that more variants are possible, some of which have been mentioned, without losing the invention idea. Such obvious variants must therefore be regarded to be included in the present invention such as it is delimited by the following claims.

Claims

CLAIMS :
1. Purification arrangement for purifying a contaminated gaseous medium comprising an ionising equipment (3) for ionising air and at least a mixing chamber (2) whereby the contaminated air is fed through the mixing chamber (2) in a main flow therethrough and ionised air is added to the main flow from the side, c h a r a c t e r i z e d i n that the ionised air is fed into the mixing chamber with a flow velocity which substantially exceeds the flow velocity of the main flow.
2. Purification arrangement according to claim 1 c h a r a c t e r i z e d i n that the ionised air is supplied via several openings (5) arranged successively after each other in the flow direction of the main flow.
3. Purification arrangement according to claim 2 c h a r a c t e r i z e d i n that at least three such openings (5) are arranged after each other.
4. Purification arrangement according to any of the above patent claims c h a r a c t e r i z e d i n that the flow velocity for the ionised air is at least 3 times as large as the flow velocity of the main flow.
5. Purification arrangement according to any of the above patent claims c h a r a c t e r i z e d i n that the flow velocity of the ionised air is at least 5 times as large as the flow velocity of the main flow.
6. Purification arrangement according to any of the above patent claims c h a r a c t e r i z e d i n that the flow' velocity of the ionised air is about 10 times larger than the flow velocity of the main flow.
7. Purification arrangement according to any of the above patent claims c h a r a c t e r i z e d i n that the ionised air is added to the main flow in a flow direction of at least an angle of 40┬░ in relation to the flow direction of the main flow.
8. Purification arrangement according to any of the above patent claims c h a r a c t e r i z e d i n that the ionised air is added to the main flow with a flow direction which is substantially perpendicular to the flow direction of the main flow.
EP98919696A 1997-04-22 1998-04-22 Purification arrangement Withdrawn EP0977623A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9701519 1997-04-22
SE9701519A SE506745C2 (en) 1997-04-22 1997-04-22 Purification device for purifying a contaminated gas medium
PCT/SE1998/000728 WO1998047603A1 (en) 1997-04-22 1998-04-22 Purification arrangement

Publications (1)

Publication Number Publication Date
EP0977623A1 true EP0977623A1 (en) 2000-02-09

Family

ID=20406689

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98919696A Withdrawn EP0977623A1 (en) 1997-04-22 1998-04-22 Purification arrangement

Country Status (5)

Country Link
EP (1) EP0977623A1 (en)
AU (1) AU7242398A (en)
CA (1) CA2287273A1 (en)
SE (1) SE506745C2 (en)
WO (1) WO1998047603A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE536263C2 (en) * 2011-12-21 2013-07-23 Airqone Building Scandinavia Ab Gas medium purifier including means for controlled supply of ionized air
SE538212C2 (en) * 2013-06-20 2016-04-05 Exhaust gas purification system for combustion engine exhaust gas comprising an ionization air ionizing device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT387158B (en) * 1987-04-03 1988-12-12 Zebinger Hans Dipl Ing Device for the purification of exhaust gases
WO1997031702A1 (en) * 1996-03-01 1997-09-04 Ebara Corporation Desulfurizing method and apparatus by irradiation of electron beam
DE19631307C1 (en) * 1996-08-02 1998-05-07 Hellmers Herm J Gmbh Method and device for cleaning gases or gas mixtures arising from liquids in containers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9847603A1 *

Also Published As

Publication number Publication date
SE9701519L (en) 1998-02-09
SE9701519D0 (en) 1997-04-22
WO1998047603A1 (en) 1998-10-29
AU7242398A (en) 1998-11-13
CA2287273A1 (en) 1998-10-29
SE506745C2 (en) 1998-02-09

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