| 摘要 |
<p>PURPOSE:To efficiently remove a harmful substance from exhaust gas by making the caliber of the aperture parts of the air permeable structure on the side of an exhaust gas inlet larger than the diameter of a granular substance. CONSTITUTION:The walls on the inlet and outlet sides of exhaust gas are respectively constituted of air permeable structures 2, 3 and the caliber of the aperture parts of the air permeable structure 2 is made larger than the diameter of a granular substance 12. Whereupon, a part of the granular substance 12 flowing down in the vicinity of the air permeable structure 2 on the inlet side of exhaust gas passes through the aperture parts to fall in an exhaust gas introducing part 7 to be accumulated on the lower part of the exhaust gas introducing part 7 and passes through the return passage 10 of the granular substance 12 to meet with the granular substance flowing down through a moving bed in a discharge part. By this constitution, the accumulation of dust or a reaction product on the air permeable structures or the granular substance in the vicinity thereof can be prevented. Therefore, an apparatus can smoothly be operated without generating a rise in pressure loss or the offset flow of gas.</p> |
