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INDUSTRIES / APPLICATIONS Croll-Reynolds is recognized as a leader in the application of "wet" air pollution control strategies in a variety of industries. Our success in gas cleaning over the past 50 years has given us a breadth of experience that few companies can claim. Croll-Reynolds has the chemical process engineering expertise to solve the toughest emissions problems.
Grain handling and/or processing operations have the potential to release particulate that can be effectively removed with venturi scrubbers. Fermentation of corn to generate ethanol also releases fugitive emissions that can be scrubbed with counter current packed towers.
Automotive Where molded plastic parts or vinyl fabrics are produced, scrubbers are used to capture the sub-micron fumes produced in the heating process. Also, scrubbers are commonly used to treat metal treating off-gases for removal of acid gases and/or fine mists.
The fundamental ingredient in concrete is portland cement. The cement manufacturing process requires a great deal of energy to heat the mixture of raw materials in a cement kiln. The main source of toxic emissions from a portland cement plant is the kiln. The treatment of kiln exhaust is similar to most incinerators processes. Scrubbers are the best choices for control of acid gases, fine particulate, heavy metals as well as dioxin and furans. The MACT II regulations, yet to be finalized, for cement kilns are expected to limit emissions similarly to those for Hazardous Waste Incinerators with only slightly less stringent requirements for some of the specific contaminants. The chemical process industry has been Croll Reynolds primary market since the Company’s inception in 1917. Our experience with a multitude of chemicals and processes is the foundation of Croll Reynolds expertise in wet scrubbing. Croll Reynolds broad experience runs from the treatment or relatively simple acid gases to exotic and severely toxic substances.
The semi-conductor, circuit board and electronics industry have multiple applications for air pollution control equipment from the control of cleaning solvents and acid gas to the capture of particulate matter.
Ammoniated compounds, fluoride gases and organic acids created as submicron fumes require scrubbers for effective control.
Silicate fumes and acid gases can occur in the production of various glasses. Acid gas scrubbers are extremely effective in controlling these emissions. Large commercial facilities or industrial plants typically have indoor heating, venting and air conditioning systems that are susceptible to air pollutants from various sources- cooking establishment smoke, dust or fugitive air emissions from manufacturing processes. These indoor air pollutants can be handled with various APC technologies beyond air filters to control odors, gases and fine particulate similar to industrial flue-gas systems. Waste incineration, such as sewage sludge, municipal solid waste and hazardous waste incineration are areas under particular scrutiny by regulators because of their multiple toxic pollutants. Croll-Reynolds has been selected by several hazardous waste facilities to design and build integrated multiple pollutant air pollution control systems to replace existing scrubber systems to meet the new Maximum Achievable Control Technology (MACT) standards. In several instances, only a scrubber was required, in others a complete new quench/scrubber sytem was designed. These systems have been installed and tested with the results showing removal performance an order of magnitude beyond the standards. Sterilization of medical instruments is required in the medical community. Either oxidizers or scrubbers have been used to control Ethylene Oxide, a gas typically used in the sterilization process. Croll-Reynolds has become the recognized leader in EtO scrubbing with numerous installations at various sterilization facilities. Medical waste incinerator flue-gas treatment is another area of Croll-Reynolds expertise.
Metallurgical Emissions produced in the steel industries are wide ranging. These can include coke oven gas clean-up, acid gas removal and furnace emission control. Oil and Gas Paint Spray Spray booths in automotive, golf ball, and parts applications generally require particle control from over-spray as well as VOC control. Wet scrubbers are effective in controlling the droplets and protecting the down-stream thermal oxidizers from fouling with the non-combustible inorganic pigments. Croll Reynolds has provided many scrubbers (venturi type, ejector type, packed towers) for the chemical plant area of refineries. These have treated pollutants such as elemental sulfur, maleic anhydride, pthalic anhydride, ethylene oxide, hydrogen sulfide, etc. Our venturi scrubbers can be effectively utilized to handle the off-gases from FCCUs. Other specialized applications (for instance using Stretford Solution in an Ejector scrubber for high efficiency H2S removal) are not unusual for Croll Reynolds.
Pharmaceutical Industry
Croll Reynolds has provided multi-stage scrubbing packages to most of the top multi-national
pharmaceutical companies for both production process and pilot pharmaceutical process off-gases.
These specialized systems are design to accommodate wide variations in operating conditions and
many different pollutants. Croll Reynolds has provided venturi scrubbers for particulate removal
and packed towers for water soluble VOC removal from tablet making processes.
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Croll-Reynolds has designed gas cleaning equipment for rocket engine emissions for the
Mercury and Apollo space mission programs as well as for Polaris and ICBM rocket fuel destruction.
During the 1980’s, the Company was the sole source for the Strategic Defense Initiative (SDI)
program to simulate outerspace using our Process Vacuum and Air Pollution control technology.
For processes where plastics are molded or extruded (as evidenced by a "hazy" exhaust plume at the
stack) scrubbers are used to treat the sub-micron particulates and oil mists generated.
Certain other processes (e.g. Fiberglass Reinforced Plastic equipment fabrication) emit VOCs that
can be captured with activated carbon adsorption.
The wood products industry includes medium density fiberboard (MDF), oriented strand board (OSB) or
particleboard plants where wood chips or fibers are treated with various chemicals to produce a
wood product. Typically, the flue gas is first treated with a cyclone to knock out large particles and
fibers, followed by a scrubber to control acid gases and sub-micron particulate/mist
before being treated in an oxidizer of some design where non-condensibles are removed.
Our expertise is in cleaning the gas of all acid gas, mist and sub-micron particulate so as to
protect the downstream catalyst in a regenerative thermal oxidizer (RTO) from being poisoned.