Importance of Three-Elements Boiler Drum Level Control and Its Installation in Power Plant

Abstract

Conversion of water into steam is the primary function of a utility boiler. The steam pressure is used to turn

Active Fault Tolerant Control System for the Measurement Circuit in a Drum Boiler Feed-Water Control System

“…It inspired the idea of creating a similar system for the water-level control system. Such a control system has been studied for many years, as presented in Alouani et al 1 and Chakraborty et al 4 The studies focused on optimization and modernization of the control algorithm structure. In these systems, there were often unused diagnostic measurement circuits or expensive and not always effective instances of hardware redundancy.…”

“…Control system faults are among the most common causes of industrial process faults. They are presented in papers 4,[14][15][16]19,21 for industrial facilities' control systems. The solution described in this article analyses a special case whose application improves reliability of a power unit operation, which is of high importance when attempting to achieve more efficient power generation.…”

“…The level of water in the steam drum (separator) is the measure of its status. 2,4 A power unit's steam drum is where the liquid water and steam are separated. It is an essential part of the system because it provides a constant supply of steam to the turbine and prevents it from absorbing water.…”

“…2,19 In particular, the measurement circuit can be, for example, replaced by a redundant measurement (using virtual sensors 7,25 ). A change in the control system structure can also prove to be a good solution, for example, when replacing a three-element control in literatures 1,4 with a one-element control, as proposed in Lindsley. 2 The level measurement in the steam drum can be falsified in a differential system, for example, due to a leakage at the joints or clogging of the signal tubes (as a result of mineral salts deposition).…”

Thermal efficiency of pulverized fuel boiler

“…Gulhane and Thakur [5]find out amount and source of irreversibility's generated in boiler of 35 TPH boiler in 6 MW captive power plant.Kumar and Reddy [6]investigated on boiler to extract maximum amount of heat from the flue gases and increase the heat pick up rate of the feed water outlet into the boiler by incorporating the additional bank of tubes in the space below the lower bank of tubes.Costa et al [7]reported data on local mean gas species concentrations of O 2, CO, CO 2 , NO X , and gas temperatures measured at several ports in the boiler and burner region and incident wall heat fluxes taken around the boiler periphery at 39 ports.Kapooria et al [8]dealt steam cycles used in power plants, Enhancement of efficiency and reliability of steam power plants are studied.Jou et al [9]said the practical benefits for reducing energy consumption and greenhouse gas emission to the use of waste hydrogen rich refinery gas (RG) to partially replace the natural gas (NG). Chakraborty et al [10] discussed design aspects and installation requirements of boiler drum level control for safe and economic operation of thermal power plants.…”