Application of Neural Networks and PID in on Line of Real-Time Temperature Control System

The Heat Process Trainer PT326 (Feedback UK) model is obtained by using two different techniques one by the Ziegler-Nichols approximating method and the other with the system identification method. The Data acquisition card EC641 I/O PT326 is developed and tested. it can be used as an interface between PC and any similar controlled system. The “velocity” form of the PID controller algorithm is implemented in real time where this algorithm is an ideal of solving the bump less transfer mechanism between manual and automatic control operation and the implementation of anti-reset windup algorithm. The method of back propagation neural network algorithm online gives very good results with neither steady state error nor overshoots.

Computational Fluid Dynamic Analysis for Modified Steam Duct in Air Cooled Condenser

Cooling system is a subsystem of a power plan that has an indispensable effect on efficiency of power plant. Air Cooled Condenser (ACC) system as a cooling system, is usually used in many power plants. Steam duct as a part of ACC conveys the steam flow with high velocity form steam turbine exhaust to head of tube bundle which is located at height of 25 to 30 meters. In this paper, pressure drop in steam duct is calculated using computational fluid dynamic method. Then, in order decrease pressure drop and consequently increase ACC efficiency, steam duct configuration is modified. The steam flow is modeled as an incompressible, turbulent and single phase flow. The solution strategy is based on SIMPLE and Segregated Implicit algorithm and the k-ε RNG model for turbulence are employed. The second order upwind differencing scheme are applied to discrete governing equations. Numerical results confirm reducing of total pressure drop in modified diffuser comparing with primary geometry.

Study on the Influence of Form Factor of Abrasion Particles on Concrete

The form factor of abrasion particles is one of the most important Influencing factors of abrasion resistance of concrete. In order to evaluate the serves life of concrete, a relationship about the form factor of abrasion particles and the wear degree of abrasion resistance of concrete should be established. In this paper, wear process of basalt on concrete was studied under the flow velocity form 1.7m/s to2.4m/s by a improved under water method test equipment. Meanwhile, an image acquisition method was used to get the form factor of basalt to measure the influence of form factor of basalt on wear degree of concrete. The result shows: the abrasion rate of concrete is higher when the flow velocity is faster and the particle form is sharper, and there is an exponential function relationship between particle forms and abrasion rate.