Abstract
Superheater tubes temperature control is a necessity for long lifetime, high efficiency and high load following capability in boiler. This study reports a new approach for the control strategy design of boilers with special shields. The presented control strategy is developed based on radiation thermal shields with low emissivity coefficient and high reflectivity or scattering coefficient. In order to simulate the combustion event in boiler and heat transfer to superheater tubes, an effective set of computational fluid dynamic (CFD) codes is used. Results indicate a successful identification of over- heated zones on platen superheater tubes and effect of radiation shields for solving this problem.
Highlights
The quick and vast development of the numerical techniques and software abilities can presently take advantage of highly sophisticated engineering techniques, such as computational fluid dynamic (CFD) calculations
This study reports a new approach for the control strategy design of boilers with special shields
After carried out the 800 computational iterations and convergence of the equations answer, temperature of the products resulting from combustion inside the boiler reaches about 2340 K
Summary
The quick and vast development of the numerical techniques and software abilities can presently take advantage of highly sophisticated engineering techniques, such as CFD (computational fluid dynamics) calculations. Numerous sub-models for simulating in the furnace processes such as combustion, the conduction, convection and radiation modes of heat transfer and chemical reaction have been developed by researchers. The model allowed the calculation of the temperature of gas and particles within the boiler In respect to this compute technique, Vafin and Abduliin [2] investigated the radiation heat transfer to these tubes from the combustion chamber in which there were water wall tubes. A numerical simulation of the flow and combustion process in the furnace of a pulverized coal fired 350 MW utility boiler was presented by Xu et al [4]. The 320 MW boiler of Isfahan power plant, Isfahan, Iran, was modeled with using the CFD technique. The study more focused on heat transfer to the superheater tubes and the temperature field on tubes besides other transport phenomena calculations
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