Method and arrangement for stabilising operation of an impingement dryer
The invention relates to a method and arrangement for stabilising operation of an impingement dryer (1) in a paper or board machine or the like. The method comprises arranging air to be heated to enter a burner chamber (4) of the impingement (1) dryer through an air inlet opening (11) of the burner chamber (4), the air entering in an angle in relation to at least one burner head (7) in the burner chamber (4), the burner head (7) having a flame opening (8) in its first end, heating air in the burner chamber (4) by bringing the air into a contact with a flame (9), and transferring heated air from the burner chamber (4) to blowing members of the impingement dryer (1). Between the air inlet opening (11) of the burner chamber (4) and the flame opening (8) of the at least one burner head (7) is arranged, in the direction of the air flow, a guiding member (13) comprising at least one aperture, and the air flow, which enters through the air inlet opening (11) of the burner chamber (4) is divided so that a first air flow (14) travels through the at least one aperture of the guiding member (13) and a second air flow (15) travels through a gap (16) formed between the guiding member (13) and the burner head (7).