| 摘要 |
PROBLEM TO BE SOLVED: To prevent plugging and scaling in a urea water spray nozzle in a urea water vaporizer to atomize urea water to exhaust gas introduced to a denitration catalyst, and uneven distribution of concentration of NH<SB>3</SB>at an inlet of the denitration catalyst. SOLUTION: This urea water vaporizer is composed of a cylindrical whirl chamber 9 in which one axial end surface is closed, the urea water spray nozzle 2 disposed on the closed end surface of the whirl chamber with its axial line set to be parallel to the axial line of the whirl chamber, and an exhaust gas inlet duct 8 connected to a circumferential surface close to the closed end surface of the whirl chamber 9 to introduce exhaust gas in a tangential direction to the whirl chamber 9. Exhaust gas introduced from the exhaust gas inlet duct 8 forms a whirl current in the whirl chamber 9 while vaporizing and mixing urea water atomized from the urea water spray nozzle 2, so that it is led from the release side end part of the whirl chamber 9 to flow into the denitration catalyst 7. COPYRIGHT: (C)2005,JPO&NCIPI
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