My New Website
Proudly serving our customers since 1997
The Selective Catalytic Reduction process (SCR) is
used when the flue gas temperature is too low for the chemical reactions to
occur spontaneously, and a catalyst is needed to accelerate the reduction
process. In order to reach high NOx reductions efficiency, the reagent must be
mixed very uniformly before entering the catalyst.
The Selective Non-Catalytic Reduction (SNCR) process
introduces a reducing agent into high temperature flue gas. The spontaneous
reaction between reagent and nitrogen oxides then forms nitrogen and water.
Wall injectors can be used for reagent injection, except on large utility
boilers, where an injection lance may be needed to distribute the reagent
SNCR Injection Equipment:
Our Ammonian Injections Equipment can be easily installed on
existing and new boiler, without costly boiler modifications. On most boilers,
wall injectos can be located in a membrane between the boiler tubes, and
sootblower ports can accommodate injection lances on large
boilers. Anhydrous as well as aqueous ammonia are readily available low
Equipment is shop-packaged and
shipped as modules to reduce on-site installation time and cost. Examples include ammonia storage systems, injection control skids, pump skids, prefabricated injection headers, SCR evaporation and control skids.
NOx Control Systems :
SNCR is a cost-effective technique to provide medium range
NOx reduction. Because of its simplicity and high reliability, capital and
operation costs are low. If used in combination with other control techniques
such as low NOx burners or combustions modifications, it can be an attractive
alternative to SCR. When used as a first stage in a hybrid SNCR/SCR system,
SNCR can reduce catalyst size.
Anhydrous Ammonia Fan Skid
pre-assembled cold air fan skid with two 120HP blowers, two ammonia
control valve trains, air filter/silencer and control panels. Painted
pipe and structure.
Engineering and Design:
Engineering services include performance evaluation and
analysis, process design and detailed equipment design. Analytical techniques
such as computational fluid dynamics and chemical kinetics are used as design
tools for solving aerodynamic and combustion problems.
Field services are provided as part of most contracts. This
can include initial site-surveys and evaluations, assistance during
construction, startup and checkout services of installed systems, and
performance optimization testing.
Aqueous Ammonia Dilution Fan Skid
(Left) Prefabricated vaporizer skid with control valves.
(Right) Complete assembled dilution fan skid with 2 blowers and control panels.
kit system required minimum installation at site by customer. Package
included two 60k gal. tanks, stairs and platform, piping, valves, bulk
head, NH3 sensors, control panels, sprinkler system and two 468KW
electric vaporizers. Meets all codes - no hassle.
Anhydrous Ammonia Tank Kit
Two 60,000 gal. tanks ready to be delivered to job site.
Aqueous Ammonia Vaporizer
Complete pre-assembled 24" dia. vaporizer. 2500 LB/HR Aqueous Ammonia.
Anhydrous Ammonia Tank Package
assembled tank package included: 12,000 gal. tank, platform, diffuser,
electric vaporizer and ammonia control valves. Minimum field
installation required. Meets all codes.
Aqueous ammonia Vaporizer Control Skid
ammonia control skid pre-assembled with control valves, control panels,
hot air blowers and vaporizer. Installed at site.
DNX Engineers, Ltd. provides engineering , design
services and supplies engineered systems to the power and process industry.
Our specialty being the control of Nitrogen Oxide (NOx)