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1. (WO1995034784) APPAREIL ET PROCEDE DE REDUCTION DES EMISSIONS DE PARTICULES A PARTIR DES PROCESSUS DE COMBUSTION
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A method of reducing particle emissions from a combustion process, the method comprising the steps of:
(a) combusting a fuel source to produce a combustion flame within a combustion zone; and
(b) applying a high voltage electrical field through the combustion zone to reduce the amount of particles leaving the combustion .zone.

2. The method of Claim 1, wherein the applying step further comprises applying an alternating potential elertrical field to the combustion zone.

3. The method of Claim 1, wherein the combusting step includes combusting a fuel source selerted from the group consisting of wood logs, wood pellets, natural gas, propane gas, wood pulp, coal, kerosene, heating oil, and organic waste products.

4. The method of Claim 1, wherein the applying step further comprises applying a high voltage elertrical potential to an elertrode located near a periphery of the combustion zone.

5. The method of Claim 4, wherein the elertrode is located in touching relation with the combustion flame.

6. The method of Claim 4, further comprising supplying secondary combustion air to the combustion zone in the vicinity of the elertrode.

7. The method of Claim 1, further comprising the step of using the high voltage elertrical field to force particles produced during combustion of the fuel source into at least one of the flame and a collection chamber.

8. The method of Claim 1, wherein the applying step further comprises applying a high voltage elertrical field includes applying a field of greater than 150 V/cm.

9. The method of Claim 1, wherein the combusting step comprises combusting a fuel source in an exhaust gas outlet conduit conveying exhaust gas from a prior combustion process.

10. The method of Claim 1, further comprising supplying secondary combustion air to the combustion zone in the vicinity of an electrode at a periphery of the combustion flame.

11. A method of reducing particle emissions from a combustion process, the method comprising the steps of:
(a) combusting a fuel source to produce a flame in a combustion zone;
(b) applying a high voltage elertrical potential to an electrode mounted at a periphery of the combustion zone and in touching relation with the flame, to subject the flame to an electrical field; and
(c) supplying secondary combustion air to the combustion zone in the vicinity of the elertrode;
whereby the applying of the field and the supplying of air reduces particulate emissions in the size range about 0.1 to about 3 microns from the combustion zone by from about 50 to about 60 wt%.

12. A combustion apparatus having reduced particle emissions from a combustion process in a combustion zone, the apparatus comprising:
(a) an electrically grounded portion in the vicinity of a first outer edge of the combustion zone;
(b) an elertrode located near a second outer edge of the combustion zone, on an opposite side of the first outer edge of the combustion zone; and
(c) a high voltage electrical field between the elertrode and the grounded portion, the field passing through the combustion zone.

13. The apparatus of Claim 12, wherein the elertrically grounded portion comprises a plenum supplied with an inlet for receiving inlet air and outlet holes for supplying primary combustion air to the combustion zone; and the elertrode comprises a hollow body portion in fluid communication with the plenum, the body portion supplied with holes to provide secondary combustion air to the combustion zone.

14. The apparatus of Claim 13, further comprising a hollow elertrically noncondurtive support extending from the plenum to the elertrode, hollow space in the support forming a conduit conveying air from the plenum to the body of the elertrode.

15. The apparatus of Claim 14, wherein the elertrically grounded portion, the electrode, and the hollow .support comprise a removable insert for a fireplace.

16. The apparatus of Claim 12, wherein the electrode comprises a secondary air supply conduit located to supply air to flames near an upper edge of the combustion zone.

17. The apparatus of Claim 6, wherein the electrically grounded portion of the housing is located below the combustion zone.

18. The apparatus of Claim 16, wherein the electrode is located sufficiently near portions of interior surfaces of the housing so that the elertrical field forces at least some particulates to migrate to and adhere to the portions.

19. The apparatus of Claim 12, wherein the electrode comprises a circular conduit supplied with an air supply conduit to provide air to hollow space within the circular conduit, and holes in the circular conduit provide secondary air to the combustion zone.

20. The apparatus of Claim 19, wherein the circular conduit is located near an upper edge of flames in the combustion zone and the elertrically grounded portion is located below the combustion zone.