The Experts below are selected from a list of 5361 Experts worldwide ranked by ideXlab platform

S H Hashemabadi - One of the best experts on this subject based on the ideXlab platform.

  • characterization and reduction of no during the combustion of biodiesel in a semi Industrial Boiler
    Energy & Fuels, 2015
    Co-Authors: Bahamin Bazooyar, Ahmad Shariati, S H Hashemabadi
    Abstract:

    This paper aims to characterize and reduce the level of nitrogen monoxide (NO) during the combustion of rapeseed oil methyl ester (ROME) in a semi-Industrial Boiler. First, the formation of NO is characterized during transitional and steady-state operation of Boiler; the influence of combustion pressure, excess air, exhaust gas temperature, spray cone angle, and combustion air swirl angle on the level of NO is evaluated, suitable burner operating points for control of NO are recognized, and contributions of thermal and prompt NO to the total level of NO are obtained. At the next level, the potential of air-staging technique (injection of extra air) in the reduction of NO is studied. Results reveal that the level of NO rises significantly in the post-flame zone 10 cm after the tail of the flame, where only the formation of thermal NO is probable in the chamber. Staged air is able to reduce the level of NO up to 10% without any negative impact on the operation of the Boiler. Results also reveal that fuel sp...

Bahamin Bazooyar - One of the best experts on this subject based on the ideXlab platform.

  • characterization and reduction of no during the combustion of biodiesel in a semi Industrial Boiler
    Energy & Fuels, 2015
    Co-Authors: Bahamin Bazooyar, Ahmad Shariati, S H Hashemabadi
    Abstract:

    This paper aims to characterize and reduce the level of nitrogen monoxide (NO) during the combustion of rapeseed oil methyl ester (ROME) in a semi-Industrial Boiler. First, the formation of NO is characterized during transitional and steady-state operation of Boiler; the influence of combustion pressure, excess air, exhaust gas temperature, spray cone angle, and combustion air swirl angle on the level of NO is evaluated, suitable burner operating points for control of NO are recognized, and contributions of thermal and prompt NO to the total level of NO are obtained. At the next level, the potential of air-staging technique (injection of extra air) in the reduction of NO is studied. Results reveal that the level of NO rises significantly in the post-flame zone 10 cm after the tail of the flame, where only the formation of thermal NO is probable in the chamber. Staged air is able to reduce the level of NO up to 10% without any negative impact on the operation of the Boiler. Results also reveal that fuel sp...

  • optimization of the combustion of some soybean oil methyl ester b5 b10 b20 and petrodiesel in a semi Industrial Boiler
    Energy, 2012
    Co-Authors: Afshin Ghorbani, Bahamin Bazooyar
    Abstract:

    This paper characterizes combustion of petrodiesel and prevalent SOME blends (B100, B5, B10 and B20), which were produced through an alkali-based transesterification in PUT, in a semi Industrial Boiler by determining its efficiency, exhaust emissions and costs. First, the influence of oxygen content of stock gases (by volume percent) upon regular emissions, thermal efficiency and costs (calculated by a cost function) was studied in order to investigate the performance and feasibility of using biodiesel in the Boiler. In the next level, a multi-objective optimization method, named cost-based optimization, was represented and optimized the combustion of the fuels.

Gholamreza Vossoughi - One of the best experts on this subject based on the ideXlab platform.

  • Multivariable robust regulation of an Industrial Boiler-turbine with model uncertainties
    2020 9th International Conference on Modern Circuits and Systems Technologies (MOCAST), 2020
    Co-Authors: Soheil Ghabraei, Hamed Moradi, Gholamreza Vossoughi
    Abstract:

    Efficient robust control methods are required to keep the Boiler-turbine unit performance appropriately. In this paper, a hybrid multivariable robust control strategy including the regulator and observer is designed to improve the performance of an Industrial Boiler-turbine unit. In the nonlinear model of the process, output variables including the drum pressure, electric power and water level of the drum are controlled at the desired set-points by manipulation of the fuel, steam, and feed-water flow rates. Due to economic and technical reasons and for the estimation of process states, the full-order observer is designed. For disturbance rejection and process stability, a regulator system is used. The performance of the hybrid control system is investigated in the presence of model uncertainties for two cases. For the regulation purpose, the dynamic system of Case I shows a more smooth variation of drum water level. Finally, it is observed that in the presence of model uncertainties, the hybrid control system guarantees the robust stability and performance of the process in estimation and regulation objectives. Implementation of the above proposed control law in its related electronic circuit of the Boiler-turbine will be considered as the future stage of the current research.

  • multivariable robust adaptive sliding mode control of an Industrial Boiler turbine in the presence of modeling imprecisions and external disturbances a comparison with type i servo controller
    Isa Transactions, 2015
    Co-Authors: Soheil Ghabraei, Hamed Moradi, Gholamreza Vossoughi
    Abstract:

    Abstract To guarantee the safety and efficient performance of the power plant, a robust controller for the Boiler–turbine unit is needed. In this paper, a robust adaptive sliding mode controller (RASMC) is proposed to control a nonlinear multi-input multi-output (MIMO) model of Industrial Boiler–turbine unit, in the presence of unknown bounded uncertainties and external disturbances. To overcome the coupled nonlinearities and investigate the zero dynamics, input–output linearization is performed, and then the new decoupled inputs are derived. To tackle the uncertainties and external disturbances, appropriate adaption laws are introduced. For constructing the RASMC, suitable sliding surface is considered. To guarantee the sliding motion occurrence, appropriate control laws are constructed. Then the robustness and stability of the proposed RASMC is proved via Lyapunov stability theory. To compare the performance of the purposed RASMC with traditional control schemes, a type-I servo controller is designed. To evaluate the performance of the proposed control schemes, simulation studies on nonlinear MIMO dynamic system in the presence of high frequency bounded uncertainties and external disturbances are conducted and compared. Comparison of the results reveals the superiority of proposed RASMC over the traditional control schemes. RAMSC acts efficiently in disturbance rejection and keeping the system behavior in desirable tracking objectives, without the existence of unstable quasi-periodic solutions.

Ahmad Shariati - One of the best experts on this subject based on the ideXlab platform.

  • characterization and reduction of no during the combustion of biodiesel in a semi Industrial Boiler
    Energy & Fuels, 2015
    Co-Authors: Bahamin Bazooyar, Ahmad Shariati, S H Hashemabadi
    Abstract:

    This paper aims to characterize and reduce the level of nitrogen monoxide (NO) during the combustion of rapeseed oil methyl ester (ROME) in a semi-Industrial Boiler. First, the formation of NO is characterized during transitional and steady-state operation of Boiler; the influence of combustion pressure, excess air, exhaust gas temperature, spray cone angle, and combustion air swirl angle on the level of NO is evaluated, suitable burner operating points for control of NO are recognized, and contributions of thermal and prompt NO to the total level of NO are obtained. At the next level, the potential of air-staging technique (injection of extra air) in the reduction of NO is studied. Results reveal that the level of NO rises significantly in the post-flame zone 10 cm after the tail of the flame, where only the formation of thermal NO is probable in the chamber. Staged air is able to reduce the level of NO up to 10% without any negative impact on the operation of the Boiler. Results also reveal that fuel sp...

Tongwen Chen - One of the best experts on this subject based on the ideXlab platform.

  • decentralized robust pi controller design for an Industrial Boiler
    Journal of Process Control, 2009
    Co-Authors: B Labibi, Horacio J Marquez, Tongwen Chen
    Abstract:

    This paper presents a new scheme to design decentralized robust PI controllers for uncertain LTI multivariable systems. Sufficient conditions for closed-loop stability and closed-loop diagonal dominance (almost decoupling) of a multivariable system are obtained. Satisfying these conditions and robust performance of the overall system are modeled as local robust performance problems. Then, by appropriately selecting the time constants of the closed-loop isolated subsystems in the IMC (Internal Model Control) strategy, the defined local robust performance problems are solved. To design a decentralized robust PI controller for a real Industrial utility Boiler, a control oriented nonlinear model for the Boiler is identified. The nonlinearity of the system is modeled as uncertainty for a nominal LTI multivariable system. Using the new proposed method, a decentralized PI controller for the uncertain LTI model is designed. The designed controller is applied to the real system. The simulation results show the effectiveness of the proposed methodology.

  • H/sub /spl infin// control design for an Industrial Boiler
    Proceedings of the 2001 American Control Conference. (Cat. No.01CH37148), 2001
    Co-Authors: H.j. Marquez, Tongwen Chen, R.k. Gooden
    Abstract:

    In the control of an Industrial Boiler system, multi-loop (decentralized) PI control is used because of its simplicity and the existence of simple online tuning rules. We show that such control schemes sacrifices robustness and performance of the overall system. In particular, under normal Boiler operating conditions, we design a robust multivariable controller using the H/sub /spl infin// loop-shaping technique. For reason of implementation, we then reduce this controller to a multivariable PI structure. Both the H/sub /spl infin// controller and its PI approximation are tested extensively in the frequency domain as well as in the time domain, using a complex nonlinear simulation software; the results obtained show that the designed controllers are superior in robustness and performance compared to the existing multi-loop controller.