Method at manufacture of board

摘要

A method for eliminating contaminating emissions at the manufacture of board from lignocellulosic material. The board manufacture comprises disintegration of the material, glueing, drying in two stages and forming to a mat and hot pressing the same to a ready board. Exhaust air separated from the drying and pressing is used in a heat energy plant. The exhaust air (16) from the pressing is heated together with fresh air (15) and used as drying air in the two drying stages (3,9). The exhaust air (20) from the second drying stage (9) is introduced as drying air to the first drying stage (3). One part of the exhaust air (18) from the first drying stage is reheated and re-used as drying air (19) in the first drying stage (3) and another part is used as combustion air (23,24,25) in the furnace (14) of the heat energy plant. <IMAGE>