Ammonia Slip Tunable Diode Laser Monitoring Systems prove very valuable to Coal Fired Power Plants 
Date: Nov 26, 2014
Cemtek Environmental, a technology leader in Continuous Emissions Monitoring Systems (CEMS), recently installed eight, Model 7000 Tunable Diode Laser Multipoint Monitoring Systems (TDLMS) measuring Ammonia (NH3) at the Detroit Edison (DTE) Monroe Facility Units 1 – 4 coal fired power plant located in Monroe, Michigan. DTE had been experiencing excessive air preheater plugging problems due to ammonia bi-sulfate (ABS) formation typical of coal fired power plants operating with Selective Catalytic Reduction (SCR) units. DTE needed a highly responsive NH3-slip monitor to continuously control their NH3 additions or productivity would continue to suffer costing the facility hundreds of thousands of dollars of lost revenue due to downtime maintenance issues.
The Monroe application consisted of two ducts per unit approximately 50’ in depth, therefore eight points of NH3 detection were required per duct to assure that NH3 slip was properly monitored. Only the Cemtek TDL is capable of monitoring up to eight points simultaneously and was the clear choice for DTE to order and install for their ammonia slip issues. In addition the application was further challenging as the ambient temperatures where the monitors were installed continuously exceeded 150 degrees F. Cemtek was called upon to install a total of eight laser controller units with a total of 64 monitoring points.
After two years of operation, the Cemtek Model 7000 TDLs have proven to be extremely accurate and reliable in monitoring the NH3 slip which has resulted in reducing the plant downtime. In addition, since the Model 7000 TDL also includes an H2O measurement channel, DTE was also able to monitor for boiler tube leaks further reducing their downtime and maintenance cycles. The combination of the NH3 slip reduction and tube leak monitor has allowed the Monroe plant to operate very efficiently resulting in increased uptime and revenues.
Cemtek’s Model 7000 Laser Monitor is a continuous monitor designed to measure flue gases for both compliance and process monitoring in the most demanding applications. The controller uses a near infrared (NIR) Tunable Diode Laser Absorption Spectrometer System utilizing a single mode “DFB” laser for unsurpassed accuracy and performance. Since the spectral purity of the laser is high and the selected absorption feature is unique, measurements can be made free of interferences from any other gas. The measurements are made in‐situ across the stack or duct in either a single or dual pass design depending upon the application. A Windows based software package is available to display the data on either a host laptop PC or the client’s existing data acquisition system.
For more information, please visit: http://www.cemteks.com
Cemtek Environmental is a division of Cemtek Group and provides a single source for cost effective Continuous Emissions Monitoring Systems (CEMS) design, integration and field services. All phases of air monitoring and reporting requirements are provided using our network of highly skilled field service technicians, CEMS specialists, Engineers and extensive CEMS design experience, measuring NO, NO2, NOX, SO2, CO, CO2, HCl, NH3, THC, H2S and many other gasses.
Media Contact
Gary Cacciatore
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Source: Cemtek Environmental, Inc.
Application: Others