What type of collector is a scrubber and which components can be used to disperse the droplets?

A scrubber is classified as a wet collector because it removes pollutants from gas streams through the use of liquid, which captures and removes particulate matter and gases. The primary function of the scrubber is to ensure that harmful substances are adequately reduced before they are released into the atmosphere, thus helping to meet environmental standards.

In terms of dispersion of droplets, a scrubber often utilizes fans and pumps. The fan helps in circulating the air or gas through the system, guiding it along with the scrubbing liquid where contaminants are captured. The pump is essential for moving the scrubbing liquid through the system to ensure it is continuously available for pollutant capture. This interaction of gas and liquid is fundamental to the functioning of wet scrubbers, making them effective in managing emissions.

The other options do not align with the characteristics of a scrubber. Dry collectors do not use liquid to capture pollutants, which is a fundamental aspect of how scrubbers operate. Additionally, the mention of positive or negative charges relates more to electrostatic precipitators than to scrubbers, which primarily rely on mechanical means and liquid interaction. Thus, the correct answer accurately reflects the operational principles of scrubbers in industrial applications.