Engineering & Consulting

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Our DLN Style Products and Services for Dry Emissions Reduction


In addition, TTS has developed a software platform called DynaFlex™ Performance that provides operators a wide range of products and services that maximizes gas turbine output and efficiency, optimizing DLN combustor dynamics and emissions, and enhancing operational flexibility.

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Operational Troubleshooting

As the international community transitions into a green economy driven by sustainable engineering practices, concern for environmental optimization is prompting governments throughout the world to require gas turbine users to reduce NOx emissions from their units.

Such environmental requirements vary from country to country and site to site, and the most cost-effective systems can vary according to factors such as the availability of resources and the diversity of governmental policies.

Lean blowout and regulatory NOx excursions are common operational problems on DLN-2.6 systems that have been tuned improperly. Our team understands the impact of ambient temperature variation on inducing these problems and establishes tuning criteria to eliminate their future occurrence.

Sometimes a turbine comes out of a scheduled outage with significantly increased NOx, above regulatory limits. We will analyze pre and post-outage turbine performance data to diagnose the cause of the problem and provide short- and long-term solutions to maintain operation within compliance.

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Combustion Dynamics Monitoring Equipment

Dry Low NOx (DLN) Combustors operate at very lean fuel-to-air ratios in order to meet single digit NOx emissions regulations. Operation at fuel/air ratios close to the lean flammability limit make DLN combustors prone to dynamic pressure oscillations that can lead to accelerated wear and mechanical distress, flashback of the flame into the pre-mixer, or lean blow out trips. Regular tuning of these systems is required to ensure compliance with emission regulations and long term component integrity.

TTS' CMS-1000 Combustor Dynamic Monitoring System is specifically tailored for measuring dynamic pressure pulsations in gas turbine DLN applications. Hardware configuration and setup are simple, and the software is user-friendly and provides data in formats that DLN tuners and operators need to easily optimize DLN operation. This system can be provided in two configurations: Portable and Permanent.

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System Design Engineering and Consulting

Our emissions abatement programs address your PPM goals and optimize the performance of your gas turbine. Our knowledge of gas turbines uniquely positions us to become your partner and help you upgrade your combustion system. Also, your integrated DLN style solution is thoroughly tested.

We offer industry-leading consulting services to gas turbine owners and operators worldwide and a wide range of emissions solutions to utilities, independent power producers and private sector enterprises. Our technical directors have extensive knowledge in mechanical, electrical, controls and support systems for overall system design for the following GT models and combustion systems:

  • 7FA DLN-2.6
  • 6FA DLN-2
  • DLN-2.6
  • 9FA DLN-2+
  • DLN-2.6+
  • 7EA / 6B / 5P DLN-1
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DLN Tuning

For DLN combustion systems, combustion tuning is required during initial unit start-up and periodically any time after combustion or hot gas path hardware is changed out. Additionally, combustion tuning may be necessary to help meet your goals for operational flexibility.

The objective of DLN tuning is to ensure that the DLN combustion system operates within its regulatory emissions limits, while also minimizing combustion dynamic pressure levels and providing enough lean blow out margin over the low NOx operating range. Based on fuel split testing data at various gas turbine loads, adjustments are made to existing fuel split schedules to achieve an optimal combination of emissions, dynamics and lean blow out margin.

Our combustion engineers can travel to your site or connect remotely to carry out this tuning exercise. The combustion engineer uses site CEMS emissions data and CDMS combustion dynamics data as necessary to assess the condition of the system and to make changes to optimize emissions and combustion dynamics to minimize combustion hardware stress levels.

Where customers do not have permanently installed CDMS system, TTS can rent a portable system for use during the tuning process. TTS also builds portable and permanent systems for sale to customers.

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System Supply, Manufacture, Installation and Commissioning

Once the optimum solution is identified, our team can undertake the complete conversion including all required hardware and the software system modifications needed on the existing control systems or the provision of new systems.

Our team has extensive experience in the provision of complete emission abatement systems for gas turbine users including both "wet" and "dry" systems. We work with each customer to analyze their required NOx levels and the cost of each potential NOx reduction approach to identify the most cost-effective system for each case. In addition, we can also provide NOx emission calculations for each of the possible situations to assure the compliance of the system before its installation.

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DLN-1 High Load Transfer

DLN-1 combustion systems must operate in the Premixed Steady-State (PMSS) combustion mode to achieve low NOx and CO emissions. DLN-1 combustion systems transfer from the Lean-Lean (LL) combustion mode to PMSS mode as the gas turbine load increases above nominally 50% load. The combustion system remains in PMSS mode between 50% and base load.

Momentary system upsets such as gas supply pressure fluctuations, the presence of liquids in the fuel, gas control valve fluctuations, or instrumentation problems can cause the flame to re-ignite in the primary combustion zone. This primary re-ignition (PRI) causes the unintended transfer of the combustor from PMSS to Extended Lean-Lean (LL-EXT) mode. In LL-EXT mode, the gas turbine operates out of emissions compliance, with NOx increasing from single digits to approximately 100 ppm. Additionally, operation in LL-EXT mode results in a life maintenance factor of 10 for the combustor hardware.

Click to Read Case Study
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DLN Training

For DLN combustion systems, combustion tuning is required during initial unit start-up and periodically any time after combustion or hot gas path hardware is changed out. Additionally, combustion tuning may be necessary to help meet your goals for operational flexibility.

The objective of DLN tuning is to ensure that the DLN combustion system operates within its regulatory emissions limits, while also minimizing combustion dynamic pressure levels and providing enough lean blow out margin over the low NOx operating range. Based on fuel split testing data at various gas turbine loads, adjustments are made to existing fuel split schedules to achieve an optimal combination of emissions, dynamics and lean blow out margin.

Our combustion engineers can travel to your site or connect remotely to carry out this tuning exercise. The combustion engineer uses site CEMS emissions data and CDMS combustion dynamics data as necessary to assess the condition of the system and to make changes to optimize emissions and combustion dynamics to minimize combustion hardware stress levels.

Where customers do not have permanently installed CDMS system, TTS can rent a portable system for use during the tuning process. TTS also builds portable and permanent systems for sale to customers.

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