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Poveda S Martinez - One of the best experts on this subject based on the ideXlab platform.

  • a comparative study of high temperature erosion wear of plasma sprayed nicrbsife and wc nicrbsife coatings under simulated coal fired Boiler conditions
    Tribology International, 2001
    Co-Authors: Higuera V Hidalgo, Carriles A Menendez, F Belzunce J Varela, Poveda S Martinez
    Abstract:

    Abstract A comparative study was carried out of the behaviour of plasma sprayed NiCrBSiFe and WC–NiCrBSiFe alloys subjected to conditions which simulate a post-combustion gas atmosphere from a Coal-Fired Boiler combustor. The study first evaluates the effects of thermal exposure at high temperatures on the microstructure of the coatings and on the adherence between substrate (austenitic stainless steel) and coatings. The oxidation rates of these coatings in atmospheres with 3–3.5% of free oxygen at 773 and 1073 K were then evaluated. The effect of WC on the low-velocity corrosion–erosion behaviour produced by the impact of fly ashes in the gas stream at high temperatures (773 and 1073 K) was assessed under impact angles of 30° and 90°. Finally, the eroded surfaces were analysed using scanning electron microscopy in order to characterize the ash embedment phenomena and the operating erosive micromechanisms.

  • high temperature erosion wear of flame and plasma sprayed nickel chromium coatings under simulated coal fired Boiler atmospheres
    Wear, 2001
    Co-Authors: Higuera V Hidalgo, Belzunce J Varela, Carriles A Menendez, Poveda S Martinez
    Abstract:

    Abstract This study concerns the behaviour of plasma and flame sprayed modified nickel–chromium alloy (with small aluminium and titanium additions) subjected to the action of simulated post-combustion gases from a Coal-Fired Boiler combustor. The study first evaluates the effects of thermal exposure at high temperature on the adherence between the substrate (austenitic stainless steel) and coatings. Then, the oxidation rates of these coatings in atmospheres with 3–3.5% of free oxygen at 500 and 800°C (773 and 1073 K) were evaluated. The low velocity corrosion–erosion behaviour produced by the impact of fly ashes in the gas stream at high temperatures (773 and 1073 K) was also evaluated under impact angles of 30 and 90°. Finally, the eroded surfaces were analysed using scanning electron microscopy in order to characterise the ash embedment phenomena and the operating erosive micromechanisms.

Higuera V Hidalgo - One of the best experts on this subject based on the ideXlab platform.

  • a comparative study of high temperature erosion wear of plasma sprayed nicrbsife and wc nicrbsife coatings under simulated coal fired Boiler conditions
    Tribology International, 2001
    Co-Authors: Higuera V Hidalgo, Carriles A Menendez, F Belzunce J Varela, Poveda S Martinez
    Abstract:

    Abstract A comparative study was carried out of the behaviour of plasma sprayed NiCrBSiFe and WC–NiCrBSiFe alloys subjected to conditions which simulate a post-combustion gas atmosphere from a Coal-Fired Boiler combustor. The study first evaluates the effects of thermal exposure at high temperatures on the microstructure of the coatings and on the adherence between substrate (austenitic stainless steel) and coatings. The oxidation rates of these coatings in atmospheres with 3–3.5% of free oxygen at 773 and 1073 K were then evaluated. The effect of WC on the low-velocity corrosion–erosion behaviour produced by the impact of fly ashes in the gas stream at high temperatures (773 and 1073 K) was assessed under impact angles of 30° and 90°. Finally, the eroded surfaces were analysed using scanning electron microscopy in order to characterize the ash embedment phenomena and the operating erosive micromechanisms.

  • high temperature erosion wear of flame and plasma sprayed nickel chromium coatings under simulated coal fired Boiler atmospheres
    Wear, 2001
    Co-Authors: Higuera V Hidalgo, Belzunce J Varela, Carriles A Menendez, Poveda S Martinez
    Abstract:

    Abstract This study concerns the behaviour of plasma and flame sprayed modified nickel–chromium alloy (with small aluminium and titanium additions) subjected to the action of simulated post-combustion gases from a Coal-Fired Boiler combustor. The study first evaluates the effects of thermal exposure at high temperature on the adherence between the substrate (austenitic stainless steel) and coatings. Then, the oxidation rates of these coatings in atmospheres with 3–3.5% of free oxygen at 500 and 800°C (773 and 1073 K) were evaluated. The low velocity corrosion–erosion behaviour produced by the impact of fly ashes in the gas stream at high temperatures (773 and 1073 K) was also evaluated under impact angles of 30 and 90°. Finally, the eroded surfaces were analysed using scanning electron microscopy in order to characterise the ash embedment phenomena and the operating erosive micromechanisms.

F. Fang - One of the best experts on this subject based on the ideXlab platform.

  • ${H}_{\infty }$-LQR-Based Coordinated Control for Large Coal-Fired Boiler–Turbine Generation Units
    IEEE Transactions on Industrial Electronics, 2017
    Co-Authors: F. Fang
    Abstract:

    The coordinated control system of a Boiler- turbine unit plays an important role in maintaining the balance of energy supply and demand, optimizing operational efficiency, and reducing pollutant emissions of the coalfired power generation unit. The existing challenges (the fast response to wide-scaled load changes, the matching requirements between a Boiler and a turbine, and cooperative operation of a large number of distributed devices) make the design of the coordinated controller for the Boiler- turbine unit be a tough task. In this paper, based on a typical Coal-Fired power unit model, using the linear-quadratic regulator (LQR), a coordinated control scheme with H∞ performance is proposed: the H∞ method is used to ensure control performance on the basis of reasonable scheduling of distributed equipment; the LQR is applied to limit the control actions to meet the actuator saturation constraints. Case studies for a practical 500 MW Coal-Fired Boiler-turbine unit model indicate that the designed control system has satisfactory performance in a wide operation range and has a very good Boiler-turbine coordination capacity.

  • A New Nonlinear Coordinated Control Strategy for Coal-Fired Boiler-turbine Units
    2007 IEEE International Conference on Control Applications, 2007
    Co-Authors: F. Fang
    Abstract:

    This paper presents a new nonlinear coordinated control strategy for overcoming the influence of process nonlinearities and improving the load-following capability of Coal-Fired Boiler-turbine units. A feedback linearization law is deduced via the dynamic extension algorithm of vector relative degree for a typical Boiler-turbine unit model. By the law, exactitude feedback linearization in universal can be realized. And then a two-degree-of-freedom I-PD structure is presented to improve the robustness and exact tracking ability of the pseudo-linear object which is obtained by the feedback linearization law. The parameters of I and PD controllers are tuned by comparing with the corresponding coefficients of an anticipant close-loop transfer function matrix. Several simulations based on a real 500 MW Boiler-turbine unit model are tested to prove the performance of the developed nonlinear coordinated control strategy.

Carriles A Menendez - One of the best experts on this subject based on the ideXlab platform.

  • a comparative study of high temperature erosion wear of plasma sprayed nicrbsife and wc nicrbsife coatings under simulated coal fired Boiler conditions
    Tribology International, 2001
    Co-Authors: Higuera V Hidalgo, Carriles A Menendez, F Belzunce J Varela, Poveda S Martinez
    Abstract:

    Abstract A comparative study was carried out of the behaviour of plasma sprayed NiCrBSiFe and WC–NiCrBSiFe alloys subjected to conditions which simulate a post-combustion gas atmosphere from a Coal-Fired Boiler combustor. The study first evaluates the effects of thermal exposure at high temperatures on the microstructure of the coatings and on the adherence between substrate (austenitic stainless steel) and coatings. The oxidation rates of these coatings in atmospheres with 3–3.5% of free oxygen at 773 and 1073 K were then evaluated. The effect of WC on the low-velocity corrosion–erosion behaviour produced by the impact of fly ashes in the gas stream at high temperatures (773 and 1073 K) was assessed under impact angles of 30° and 90°. Finally, the eroded surfaces were analysed using scanning electron microscopy in order to characterize the ash embedment phenomena and the operating erosive micromechanisms.

  • high temperature erosion wear of flame and plasma sprayed nickel chromium coatings under simulated coal fired Boiler atmospheres
    Wear, 2001
    Co-Authors: Higuera V Hidalgo, Belzunce J Varela, Carriles A Menendez, Poveda S Martinez
    Abstract:

    Abstract This study concerns the behaviour of plasma and flame sprayed modified nickel–chromium alloy (with small aluminium and titanium additions) subjected to the action of simulated post-combustion gases from a Coal-Fired Boiler combustor. The study first evaluates the effects of thermal exposure at high temperature on the adherence between the substrate (austenitic stainless steel) and coatings. Then, the oxidation rates of these coatings in atmospheres with 3–3.5% of free oxygen at 500 and 800°C (773 and 1073 K) were evaluated. The low velocity corrosion–erosion behaviour produced by the impact of fly ashes in the gas stream at high temperatures (773 and 1073 K) was also evaluated under impact angles of 30 and 90°. Finally, the eroded surfaces were analysed using scanning electron microscopy in order to characterise the ash embedment phenomena and the operating erosive micromechanisms.

N. V. Petrova - One of the best experts on this subject based on the ideXlab platform.