Drying and firing will adopt twice setting & firing process. drying chamber adopts tunnel dryer with inner width of 2.4meter. whole production line adopt 7 lines of double-rail tunnel dryers. the heating source is residual/waste heat from the tunnel kiln. the smoking air feeding temperature and air volume will be adjusted through the air-adjustment-system, so as to ensure the drying quality of green bricks. well-dried green bricks will be unloaded from drying cart and re-stacking on the kiln cart manually.