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| Our best performance from selected reference projects |
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Reference project 1:
CEOS for a 350 MW coal-fired tower boiler
The situation
Uncontrollable fouling and slag formation as well as erosion on the heating surfaces often led to interrupted operation and high maintenance costs. The existing boiler diagnostic system reflected the actual deposit situation unspecifically to be usable as the basis for a better aligned boiler cleaning. The boiler cleaning was executed in time controlled periods.
The aim
The aim of the client was an improved steam generator efficiency by means of boiler cleaning which is capable to handle the actual deposit situation. |
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The solution
With the employment of heat flux sensors in the furnace, weight sensors in the convective area, the Matrix Clean analysis unit, thermodynamical modelling as well as measuring data analysis by the SMART Furnace-FACOS and SMART Convection modules, the basis for identifying a critical deposit state in time was created.
The CLEANING MANAGER ensures the activation of the recommended cleaning actions in accordance with the defined priorities. A new investment in boiler cleaning equipment was not necessary. CEOS works with the existing 84 steam-driven wall blowers in the furnace and the 42 long retractable sootblowers in the convective area. |
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Installation
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Achieved results
The average heat absorption in the furnace improved by means of demand-driven cleaning with CEOS by 10 %. In addition, the number of cleaning operations was reduced significantly by 35 %. Along with this were savings in steam and reduced erosion.
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Reference project 2:
CEOS for a 630 MW two-pass boiler, fired with Powder River Basin coal (PRB)
The situation
After several changes in fuel supply and process modifications, the furnace was not adequately cleaned with the original 36 wall blowers. Consequently, the furnace exit gas temperature was excessive. This in turn accelerated deposit build up in the convective area. In sum, boiler efficiency and heat absorption decreased. |
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The aim
The aim was to improve the on-load boiler cleaning efficiency, in particular the cleaning performance in the furnace, in order to furnace exit gas temperature and the damage effected by this in the future. |
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The solution
As water is more efficient at removing this kind of tenacious and complex deposit in the furnace, only four SMART Cannons (water cannons) were needed to replace the existing 36 wall blowers. The applied SMART Flux sensors measure continuously the actual deposit situation on the heating and reaction surfaces. The data was analysed in real time so that the water cannons could be controlled by demand-driven cleaning parameters at any time. The existing 96 retractable sootblowers in the convection area remained unchanged. SMART Gauge sensors measure continuously the deposit weight development. Thanks to real time data analysis by means of SHFM in combination with continuous thermodynamic modelling by TDM, the system detects on time which retractable sootblower needs to be activated with which cleaning parameters to remove deposits that are criticial to efficiency. In doing so, the on-load boiler cleaning is optimized and aligned with process specific needs. |
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+ SMART Cannon (water cannon) |
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Achieved results
Furnace and superheater cleanliness improved significantly. As a result of this, heat absorption and boiler efficiency increased by 0.3 %, the furnace exit gas temperature decreased by 38 °C. |
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