Design of burner performance optimization system based on laser machining

The existing burner performance optimization system neglects the measurement of single pulverized coal particle temperature in the combustion process, so the temperature control error is large, which leads to poor performance improvement of burner and poor control of residual oxygen. Therefore, a burner performance optimization system based on laser machining is designed. Design the overall frame of burner performance optimization. The performance optimization of the burner is mainly realized by the control of temperature and oxygen content. The gas quantity is calculated and fed back to the PID controller through the error value and the rate of temperature difference between the actual temperature and the set temperature. Based on the Hencken plane flame burner, an optical measur­ing system for single pulverized coal particle ignition based on laser processing is established to obtain the temperature of the particles. Based on this, the Proteus-based burner transient temperature distribution subsystem and the steady-state ANN model-based temperature control optimization algorithm are designed. The experimental results show that the burner of the system can control the residual oxygen very well, and the temperature control result of the system is highly fit with the simulation result, so the temperature control precision of the system is high

Effects of W/Co co-doping on the structural, multiferroic, dielectric and optical properties of filled tungsten bronze Ba4Sm2Fe2Nb8O30 ceramics

The structural, magnetic, ferroelectric, dielectric, magneto-dielectric and optical properties of W/Co co-substituted tungsten bronze Ba4Sm2Fe2Nb8-3x(W2Co)xO30 (0 ≤ x ≤ 0.3) ceramics were studied in detail. All the samples can be indexed with the tetragonal structure with the space group of P4bm. The room-temperature ferromagnetism with rather high ferromagnetic Curie temperature Tc was obtained in all compositions. The co-doping of W/Co ions obviously optimized the ferromagnetism and ferroelectricity. The composition x  = 0.2 showed a superior multiferroicity with the remnant magnetization Mr of 0.15 emu/g and the remnant polarization Pr of 2.1μC/cm2 as well as the Tc of 886 K. The low-temperature relaxation was related to the thermal process of oxygen vacancies, while the another one around 300 K was ascribed to the localized hopping of electrons. The relative increment of magneto-dielectric constant (MDC) obeyed with the square term of magnetization in Ginzburg-Landau theory, implying the existence of intrinsic magneto-electric coupling effect. A relatively large MDC of 0.17 % was achieved in pure sample. In addition, two direct inter-band transitions with the narrow band gaps of ∼2.0 eV and ∼2.5 eV were demonstrated