The invention discloses a device for preventing downwash of
smoke plume for a
chimney. The device is characterized in that through CDF fluid dynamics analogue
simulation design, a shrink mouth is formed in the top of the
chimney, and air baffles are arranged on the outer wall of the shrink mouth, so that
smoke is exhausted from the shrink mouth, and the flow speed at a
smoke outlet is increased; and besides, through the arranged air baffles, local vertical air speed on the outer wall of the shrink mouth can be increased; through the combination of the shrink mouth and the air baffles, the height of the
smoke plume is increased, so that the phenomenon that
smoke plume washes down can be avoided. Through the adoption of the device, the contact of
smoke plume and a
chimney body can be avoided, so that the hidden danger that the chimney is frozen can be fundamentally eliminated. Compared with a conventional
electric heating device, the device can thoroughly solve the problem that the chimney is frozen due to the downwash of smoke plume; besides, the device disclosed by the invention is simple in structure, and
modular design and mounting are adopted; and the device is low in cost, safe and reliable, and basically no maintenance cost is needed for later periods. The device disclosed by the invention is applicable to various chimneys of thermal power plants, such as concrete single-tube chimneys,
brick sleeve chimneys, steel sleeve chimneys and
glass fiber reinforced plastic chimneys.