NOx Reduction Applications: Nitric Acid Plants
NOx Reduction Applications: Nitric Acid Plants

The CRI Selective Catalytic Reduction (SCR) technology is regarded as the premier NOx reduction technology for nitric acid plants worldwide in terms of performance, reliability, operational benefits and cost effectiveness. CRI SCR systems are successfuly operating on nitric acid plants ranging from 225 to 2000 tpd in North America, Europe, Asia Pacific and Africa.

Ask plant operators what they appreciate most about our system, and they'll tell you:

• Reliability
• Ease of operation
• Low-cost installation
• Long catalyst life
• Low operating costs

Outstanding reliability

The CRI SCR system has a proven track record for reliability, with continuous achievement of low NOx emissions with virtually no NH 3 slip, even from high inlet NOx levels.

Ease of operation

The high activity and buffer capacity of the CRI SCR catalyst technology delivers excellent controllability and consistently low NOx and NH 3 emissions, even under varying load conditions.

Flexible installation

The CRI SCR technology can be installed in either the high-pressure position before the expander or in the low-pressure position after the expander, and across a wide range of temperatures, as low as 300° F (150° C) or as high as 700° F (375° C) which makes installation possible when space is limited in one of the locations. The high activity catalyst and a compact reactor design conserve space and costs wherever the SCR is installed.

INSTALLATION OPTIONS FOR THE CRI SCR SYSTEM

Easy retrofit to replace existing high-cost technologies

For high-pressure systems, retrofit of the CRI SCR catalyst involves the simple replacement of existing radial catalyst reactor internals by a CRI Lateral Flow Reactor (LFR) catalyst module inside the pressure vessel.

Low operating costs

Both low- and high-pressure installations benefit from the very low pressure drop of the CRI system. This keeps operating costs low, potentially increasing acid plant throughput and accelerating financial pay-back when compared to other SCR or catalytic abator systems or caustic scrubbers. In addition, the low temperature capabilities of the CRI SCR catalyst eliminates the requirement for flue gas reheating necessary for other technologies.

Deep NOx conversion

The CRI SCR technology has proven to consistently deliver over 95% NOx conversion from more than 5000 ppm inlet NOx concentrations.

Comprehensive service

CRI can provide additional components for an integrated SCR system. For both high- and low-pressure locations, CRI can supply the SCR catalyst, catalyst modules, ammonia injection grid, and the atmospheric reactor house or pressure vessel, when needed.