Pulsar Process Measurement Ltd
Pulsar Process Measurement Ltd design, manufacture and market level, volume, open channel flow, pipe flow and pump control instrumentation. Our company specialises in non-intrusive measurement, and our technology is used in a wide variety of industries and applications worldwide. By concentrating on the development of ultrasonic level measurement, we believe that Pulsar can be fairly described as the world technology leader in this field. The product range has been designed to provide a full range of alternatives, from single point of measurement installations right through to complex multi-point applications with digital communications. The ultrasonic range has been augmented with other products, so for the water industry, interface monitors for tricky sludge level measurement application have been added together with units that can be used to warn of pump failure. In more general level applications, single point measurement devices are available where continuous level measurement is inappropriate.
Mr Alistair MacKinnon
Cardinal Building, Enigma Commercial Centre
Pulsar's Sludge Finder Helps Severn Trent to Generate Extra Electricity
Pulsar Process Measurement have supplied eight Sludge Finder 2 sludge interface monitors to Severn Trent's Stoke Bardolph site as part of a process improvement project that has allowed the company to significantly increase electricity generation on site and return energy to the National Grid.
In common with many large sewage treatment works, Stoke Bardolph uses the gas produced in the digesters to drive turbines, generating electricity. The more gas produced, the more electricity can be generated, and an important determinant of gas volume is the quality and density of the sludge being delivered to the digesters.
Stoke Bardolph wanted to increase sludge density from an average of around 2% up to a target of 6%. The project included a move to positive displacement pumps and installation of sludge density monitors. It was also important to reliably and consistently measure the sludge blanket level to optimise the pump operation, making sure that the maximum amount of sludge of the right density is efficiently transferred to the digesters.
Before the Pulsar units were installed, sludge blanket measurement was made using a dip tube. The measurement needed to be made every day, which involved climbing onto the rotating bridge of the clarifier, and operating a metres-long dip tube. This has to be done every day, a potentially hazardous operation and not the dynamic measurement required to make the process work efficiently. In addition, the dip tubes tended to crack in cold weather.
Pulsar's Sludge Finder 2 features a self-cleaning ultrasonic transducer, continuously measuring sludge blanket level. The instrument signal is taken off the rotating bridge through the slip rings and the signal is fed back to the site SCADA system, where it appears on plant mimics and is used by the system to determine the optimum time that the pumps are in operation.
The scheme has been a resounding success. Stoke Bardolph generates 5.5MW (5500KW) at full power. Enough energy is produced, not only to power equipment on site, but also to return a net surplus of electricity to the Grid; making the site energy self-sufficient.
For further information please email Pulsar Process Measurement Ltd