This paper deals with the application of state space neural network models to fault detection of the boiler unit. The work describes problems such us selecting the proper threshold for compromising both fault sensitivity and early fault detection, designing proper neural network structure or calculating performance indexes. All the simulation data used in experiments are collected from the simu...

Proposed the PID controller parameters tuning method based-on New Luus-Jaakola (NLJ) algorithm and satisfaction idea. According to the different requirements of each performance index, designed the satisfaction function with fuzzy constraint attributes, and then determined the comprehensive satisfaction function for PID tuning by NLJ algorithm. Provided the steps of PID controller parameters tu...

Ferric oxide, hematite, "red rust" , it has a lot of names but there is no argument that it is undesirable. It is a loosely adhering oxide layer which has poor heat transfer capabilities. It also tends to deposit elsewhere in the system. It can deposit in the coil, in steam traps and piping downstream, and can eventually reach the boiler. In the boiler it can form further deposits, which in tur...

We specify a controller for a steam boiler starting from an informal descriptions of its requirements. The specification is formalized in the temporal logic TRIO and its objectoriented extension TRIO+. To obtain a maximum of abstraction and reuse we make the specification parametric with respect to all equipment and hardware features, and we avoid to impose any particular strategy in the manage...

This set of theories presents an Isabelle/HOL formalisation of stream processing components introduced in Focus, a framework for formal specification and development of interactive systems. This is an extended and updated version of the formalisation, which was elaborated within the methodology “Focus on Isabelle” [6]. In addition, we also applied the formalisation on three case studies that co...

Multi-input multi-output (MIMO) dynamic matrix control (DMC) technique is applied to control steam temperatures in a large-scale ultrasupercritical once-through boiler–turbine system. Specifically, four output variables (i.e., outlet temperatures of platen superheater, finish superheater, primary reheater, and finish reheater) are controlled using four input variables (i.e., two spray valves, b...

Abstract One of the most critical factors affecting boiler efficiency and hazardous-gas-emission reduction is volume excess air mixed with fuel. A knowledge-based approach proposed to model a 320-MW natural-gas-fired steam power plant in Isfahan, Iran by applying fuzzy-modelling techniques control efficiency. This based on fuel entering boiler. First, fuzzy-model structure identified fuzzy rule...

1. Steam Generation 1.1. General Characteristics 1.2. Circulation in Boiling Water Reactors 1.3. Steam Generation in CANDU Reactors 1.4. Steam Generators 1.5. Steam Generator for PWR and CANDU Systems 1.6. Heat Transfer 2. Steam Generator Operation 2.1. Swelling and Shrinking 2.1.1. Steady State Swelling and Shrinking 2.1.2. Transient Swelling and Shrinking 2.2. Level Control 2.3. Carryover 2.4...

Burning coal in power plants produces significant amounts of deposits like fouling and slagging on boiler surfaces which contributes to the overall poor performance of the power plants (by reducing electricity generation capacity, decreasing boiler efficiency and increasing overall maintenance cost). Recent research and development on boiler fouling and slagging problems, with the current preve...

A Takagi-Sugeno (T-S) fuzzy model is used to express non-linear dynamic systems with time-delay in this paper, and an on-line identi® cation algorithm is presented regarding its parameters and structures. A multivariable fuzzy generalized predictive control approach is proposed based on the identi® ed fuzzy model by means of the generalized predictive control principle. The closed-loop stabilit...