Wet dust collectors are relatively inexpensive to manufacture. However, it is the ideal dust removal method for dusts with moisture, viscous and irritating odors produced in the chemical, painting, glazing, pigment and other industries. Since not only dust can be removed, a part of the odor can be removed by using water, and if it is a harmful gas (such as a small amount of sulfur dioxide, hydrochloric acid mist, etc.), absorption of the absorbent can be prepared in the washing liquid.
(1) The mud discharged from the wet dust collector should be treated, otherwise it will cause secondary pollution.
(2) When purifying aggressive gases, chemical aggressiveness is transferred to the water, so the sewage system is protected with anti-corrosion materials.
(3) It is not suitable for hydrophobic soot, and it is easy to block pipes, blades, etc. for viscous soot.
(4) Compared with dry dust collectors, water consumption is required, and the problem is solved. Anti-freezing measures should be adopted in severe cold areas.
There are many forms of wet scrubbers used in engineering. Generally, it can be divided into low energy and high energy. The low-energy wet dust collector has a pressure loss of 0.2-1.5 kPa, including a spray tower and a cyclone scrubber. The water consumption (liquid-to-gas ratio) under normal operating conditions is 0.5-3.0 liters per cubic meter, for particles above 10 microns. Purification efficiency can reach 90%-95%. The high-energy wet dust collector has a pressure loss of 2.5-9.0 kPa and a purification efficiency of over 99.5%, such as a venturi scrubber. The performance and operating range of the main wet dust removal device are summarized in the table below. It is now limited to the three types of wet scrubbers that are widely used, namely spray tower scrubbers, cyclone scrubbers and venturi scrubbers.