Novel coordinated control method with coal-quality correction of circulating field bed boiler
To improve the load-following capability and the coal-quality applicability of a circulating field bed boiler (CFBB), a new coordinated control method with coal-quality correction is proposed in this paper. This method takes the primary air as another new control variable into the coordinated control of CFBB, which can take advantage of the unburned carbon in bed to improve its load-following capability. Simultaneously, a multivariable predictive controller based on augmented state space model is designed to deal with the CFBB's characteristics such as time-delay and strong coupling. Finally, an improved strategy to correct coal-quality online based on the disturbance observer is provided. Compared with the conventional control scheme, the simulation results for a 330MW CFBB shows that the method proposed in this paper can significantly improve the load-following capability and the coal-quality applicability.
The Steam Pressure Self-Adaptive Control System of a Monoblock with Home-Made 75t/h CFBB
Based on analysis of the CFBB dynamic perfomance and combined the practical thchnological circumstances of the worksite,the authors have put forward a full-coefficients steam pressure self-adaptive control system. The practical application has obtained satisfactory results.
Women in Social Work Education: Progress or Promise?
Abstract The literature on the status of female social work educators has addressed the problems these educators face in the areas of salaries, academic rank and tenure, publication rates, and level of decision making. Given this attention to the status of these educators, one might expect positive resolutions to these problems. This article, which is based on a review of both the current literature and statistics on US social work faculty, evaluates the status of women faculty in social work academia to determine if progress has been made. Findings reveal that female educators are seeing slow improvment in some areas; however, inequalities continue. The authors suggest strategies for supporting the development and retention of women faculty.