Wet vs. dry collection

TM 5-815-1/AFR 19-6

to prevent plugging, reduce abrasions, or

(3) Utilizing a primary and secondary collector in

reduce the dust loading to the secondary

series provides some flexibility to the system

collector. The addition of a precleaner adds

in the event there is a failure of one of the

pressure drop and costs, and should only be

collectors.

f. Wet vs. dry collection. Factors to be taken into

applied where the performance of the

secondary is inadequate without a primary

consideration in a comparison of wet and dry collection

collector of the type proposed.

include:

(2) Mechanical collectors of the multicyclone

-- Solubility of aerosol

type are usually the first choice for primary

-- Ultimate pH of scrubbing liquor

collector service. They are low cost; provide

-- Liquor corrosion and erosion potential

reliable collection of large diameter

-- Special metals or protective coatings

suspended solids in the 85 percent collection

-- Availability of make-up water

efficiency range; and can be specified in a

-- Disposal and treatment of waste water

wide variety of wear resistant metals. There

-- Space required for liquid-handling equipment

are very few NSPS applications where the

-- -Vapor plume visibility

single or (in series) double mechanical

-- Operating and installed costs

collector can meet the particulate emission

-- Maintenance and operation

g. Summary. A summary of the general guidelines in

standards. Consequently, a final cleaning

device of high efficiency on small size

the selection of emission control equipment for boiler

particulate should follow the mechanical

flue gases is provided in table 12-3.

collector.

12-9