CRI Catalytic Dioxin Destruction Technology
Dioxins
Dioxins comprise a family of over 200 chemical compounds known
as persistent organic pollutants, harmful by-products of
industrial processes and waste incineration. Major sources
of dioxin emissions include municipal solid, industrial liquid
and medical waste incineration, as well as some chemical
and metal sintering operations.
Dioxins are potent carcinogens; their adverse effects also
include neurological, developmental, reproductive and immunotoxic
effects.
The Shell Catalytic Dioxin Destruction System (SDDS) from
CRI is a proven low-temperature technology for flue gas dioxin
emission destruction, with excellent cost/performance benefits
compared to other dioxin emission control technologies.
The Shell Dioxin Destruction System
Single-step simplicity
Unlike technologies based on carbon adsorption, the CRI catalytic
system destroys dioxin compounds in a single process step,
with no subsequent processing needed. In addition, the CRI
process does not require the addition of any reactant beyond
the oxygen already in the flue gas. The CRI system uses a
specially developed catalyst to convert dioxins to a mixture
of harmless gases.
Low emissions at low temperatures
The CRI dioxin destruction catalyst enables dioxins to be
reduced to extremely low levels at low flue gas temperatures,
even as low as 320° F (160° C).
Unique reactor design
The CRI dioxin destruction catalyst is contained in engineered
stainless steel modules called lateral flow reactors, which
expose the greatest amount of catalyst surface to the flue
gas which gives the highest performance with lowest pressure
drop.
High destruction efficiency
The combination of high catalyst activity with the lateral
flow reactor allows the Shell Dioxin Destruction System to
easily achieve high dioxin destruction efficiency. From the
highest inlet concentrations, the system can achieve over
99.9% destruction of dioxins and furans, down to the lowest
worldwide regulated emission limit of 0.1 ng TEQ NM 3.
Flexible applications
The CRI catalytic dioxin destruction technology has been successfully
applied to both liquid waste incinerators after the wet acid
gas scrubber, and to solid waste incinerators after the acid
gas and particulate removal systems. The low-operating temperature
and the ability to design for low pressure drop allow the
Shell Dioxin Destruction System to be positioned at the tail
end of most existing processes, just prior to the stack.
The Shell Dioxin Destruction System Process Flow Chart
Solid Waste Incineration Application
Hazardous Liquid Waste Incineration Application
Easy retrofit
The compact, lightweight nature of the system allows easy
retrofit onto existing facilities where space is limited.
Installation at the end of the process results in significant
savings in installation and operating costs, with minimal
downtime for installation.