INTRODUCTION

The Potential of Sequence Applications

Automatic and efficient control of industrial burners firing boilers to match boiler outputs according to overall steam demand. Thus, the well proven Hamworthy Combustion Sequence Control System can provide plant operational improvements as well as energy and labour cost savings: 2 Boilers - Lead/Lag 6 Boilers - SequenceA 4-20 mA master header pressure signal is fed to a proportional, integral and derivative (PID) Control algorithm within the sequence control panel which determines burner firing rates to maintain header pressure at the selected point. Local boiler pressure transmitters enable boiler top-up control to ensure boilers are maintained ready for sequencing. Burner/boiler control panels are fitted with interface controls and a switch to enable sequence/local control. Different burner configurations can be accommodated. By optimum and responsive loading of boilers By avoiding costly operating staff monitoring and responding to load changes By use of a purpose built sequence controller for multiple steam boiler applications utilising modulating burners The Hamworthy Combustion Sequence 2000 provides automatic control of boilers in response to fluctuating daily and seasonal steam requirements

Boiler Pressure transmitters Master header Pressure transmitter Total steam flow transmitter ( suitabl yp ositioned ) ( enhanced s y stem ) Steam heade r Sequence control panel LCD touch screen(H.M.I.) Communication links (enhanced system) Boiler automatic steam control valves manufacturer (enhanced systems) Burner/boiler Control override

A typical 4 boiler sequence system

Controlpanel