Drying of filter elements in a filter system

A method of drying a plurality of filter elements in a filter system, wherein the filter system comprises:

• a filter housing comprising:
• an inlet for a product-containing gas, for the product-containing gas to be cleaned by filtering in a product-containing gas cleaning mode of the filter system;
• an outlet for cleaned gas;
• and
• a partition wall dividing the filter housing into a product chamber for the product-containing gas and a clean-gas chamber, wherein the partition wall is provided with a number of openings from which a plurality of filter bags extend downwards into the product chamber;
• wherein the inlet for the product-containing gas is placed in an upper part of the product chamber and in open communication with the product chamber, and configured for supplying the product-containing gas to the product chamber in the product-containing gas cleaning mode, wherein cleaning of the product-containing gas is accomplished by the product-containing gas flowing into insides of the plurality of filter bags and filtered gas from the plurality of filter bags flows upwards into the clean-gas chamber, from where the filtered gas is discharged through the outlet for clean gas;
• a source of a drying air or gas;
• one or more drying air or gas supplies connected to the source of drying air or gas and having openings placed in a part of the product chamber below the plurality of filter bags;
• the method comprising:
• leading the drying air or gas from the source and the openings from below and up along sides of the plurality of filter bags;
• supplying the drying air or gas from the source of the drying air or gas to the one or more drying or gas supplies after wet cleaning of the plurality of filter bags and before the filter system enters the product-containing gas cleaning mode;
• and
• applying the drying air or gas to the plurality of filter bags so as to dry the plurality of filter bags.

A filter system, comprising:

• a filter housing comprising:
• an inlet for a product-containing gas, for the product-containing gas to be cleaned by filtering in a product-containing gas cleaning mode of the filter system;
• an outlet for cleaned gas;
• and
• a partition wall dividing the filter housing into a product chamber for the product-containing gas and a clean-gas chamber, wherein the partition wall is provided with a number of openings from which a plurality of filter bags extend downwards into the product chamber;
• wherein the inlet for the product-containing gas is placed in an upper part of the product chamber and in open communication with the product chamber, and configured for supplying the product-containing gas to the product chamber in the product-containing gas cleaning mode, wherein cleaning of the product-containing gas is accomplished by the product-containing gas flowing into insides of the plurality of filter bags and filtered gas from the plurality of filter bags flows upwards into the clean-gas chamber, from where the filtered gas is discharged through the outlet for clean gas;
• a source of a drying air or gas;
• one or more drying air or gas supplies having openings placed in an upper part of the product chamber and are configured for leading drying air or gas towards a lower part of the plurality of filter bags after a wet cleaning mode of the filter system, wherein during the wet cleaning mode and prior to the filter system entering the product-containing gas cleaning mode, the plurality of filter bags are wet cleaned;
• and
• wherein the drying air or gas is for drying the plurality of filter bags.