| Identifying Waterwall Flame Impingement | | Monitor gas temperature distribution at the furnace exit plane to identify hot spots and locations of direct flame impingement upon waterwall tubes. Unit operation can then be modified to achieve a more even temperature distribution and eliminate hot spots on the side walls. Typical remedial control actions (depending upon the type and design of the specific boiler/furnace) can include burner balancing, air system balancing, burner maintenance, fuel flow adjustment, and adaptive burner control. |
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Benefits |
| | Helps prevent waterwall tube failures, prolongs waterwall tube life, reduces unit downtime, improves water/steam circulation, improves heat rate, and increases overall operating efficiency. |
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| Identifying Cool Areas | | Monitor temperature distribution profile and average gas temperatures in user defined zones of the furnace exit plane to identify cool areas. |
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Benefits |
| | Identifies plugged or malfunctioning burners, and improper air/fuel ratios. Helps to achieve better atomization, fuel distribution, mixing, and unit circulation. Results in improved heat distribution and lower heat rate. |
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| Reducing NOx and thermal stress by Eliminating Temperature Peaks | | High gas temperatures are the fundamental indicator of excess flame temperatures. A Boilerwatch® MMP temperature mapping system at the furnace exit plane will clearly show excess gas temperatures and regions of temperature peaks at the furnace outlet. With this information, the operator can control the combustion process by selective burner and air control to achieve furnace exit temperatures that produce less NOx. In addition, regions of temperature peaks (or hot-spots) can be eliminated to produce a more uniform temperature distribution entering the superheat and reheat areas. |
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Benefits |
| | Monitoring the Gas Temperature not only reduces NOx formation, but reduces the thermal stress on the upper furnace and convection pass components. As NOx emissions requirements continue to become more stringent, optimal burner management will become more necessary. Low NOx burners, together with continuous, real-time, non-intrusive monitoring of combustion temperatures provides important and effective tools needed to insure NOx reduction targets are met. |
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Reducing NOx by
Optimal Control
of Sorbent Injection | | Most NOx reducing sorbent injection systems are effective only when gas temperatures are maintained within certain minimum and maximum ranges. TMS-2000‘s ability to continuously monitor average gas temperatures within user-defined zones of a horizontal plane in the furnace provides critical information required for automatic control of sorbent injection systems. |
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Benefits |
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| | To be effective, a sorbent injection system must operate reliability and automatically over a wide range of unit operating conditions and loads. Real-time temperature information is essential to the performance of sorbent injection strategies and the effective control of NOx.
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