The exhaust gas purification tower is a device for performing an absorption operation. There are three types of gas-liquid contact forms. The first type is a plate tower, bubble absorption tower, and stirred bubble absorption tower in which gas is dispersed in the liquid phase in the form of bubbles; the second type is an ejector, a Venturi tube, and a spray, in which liquid is dispersed in the liquid phase in the form of droplets. Tower; The third type is the packed absorption tower and falling film absorption tower where the liquid comes into contact with the gas phase in a film-like motion. The supplier of 2008 Beijing Olympic rowing paint exhaust gas purification tower, Shanghai Anjule Environmental Protection Technology Co., Ltd. has developed a biological purification tower based on the practice summary. It adopts the biological purification principle and filters and adsorbs and purifies layers. Unique equipment.
Exhaust gas purification tower structure: The gas-liquid two-phase flow mode in the tower can be countercurrent or co-current. Generally, countercurrent operation is adopted. The absorbent is added from the top of the tower to flow from the top to the bottom, and it contacts the gas flowing from the bottom to the top. The absorbent liquid is discharged from the bottom of the tower, and the purified gas is discharged from the top of the tower. Packing is the core of a packed tower, which provides a contact surface between the gas and liquid phases in the tower. The structure of the packing and the tower determines the performance of the tower. The filler must have a large specific surface, high porosity, good wettability, corrosion resistance, certain mechanical strength, low density, and low price. The commonly used fillers are Raschig ring, Bauer ring, arc saddle shape and rectangular saddle shape filler. New types of fillers developed after the 1980s, such as QH-1 flat ring filler, Bayer inner ring, hedgehog filler, metal Plate packing, structured plate corrugated packing, grid packing, etc., provide the basis for advanced packing tower design.
Inclined orifice plate tower is another form of sieve orifice plate tower. The inclined hole is 10-20m wide, 10-15mm long and 6mm high. The air tower air velocity is generally 1 ~ 3.5m / s, and the screen air velocity is 10 ~ 15m / s. The gas is ejected horizontally from oblique holes, the orifices of adjacent two holes are in opposite directions, staggered, and the liquid is supplied to the tray (weir height 30mm) through the overflow weir, which flows perpendicularly to the direction of the airflow, causing a high degree of turbulence in the gas and liquid, The gas-liquid surface is constantly updated, the gas-liquid is in full contact, the mass transfer effect is good, and the purification efficiency is high. At the same time, it can handle dust-containing gas and is not easy to block. The resistance of each layer of sieve plate is about 400 ~ 600Pa. The structure of the tower is more complicated than that of the screen plate tower, which is more difficult to manufacture, has strict installation requirements, and is prone to bias flow. It is especially suitable for trapping fine particles in airflow. However, because gas-liquid co-current flows, the gas-liquid contact time is short, which is not suitable for gas-liquid absorption that is difficult to dissolve or has a slow reaction speed, and the pressure loss is large (800-9000h), and the energy consumption is high.
Post time: Mar-02-2020