New Forest Paper Mills selects the Krohne Optiswirl 4070C vortex flowmeter to measure methane gas emitted from its anaerobic bioreactor.
New Forest Paper Mills, of Ontario, Canada, manufactures brown paper and liner board used to make corrugated packaging. It uses recycled materials to produce new paper and board in grades from 112 grams to over 200 grams per square metre.
Water used in the manufacturing process collects fibres and starches that are consumed in an anaerobic process. The mill needed a robust flowmeter with pressure and temperature capability to measure dirty methane gas being pumped from the biomass reactor.
Jeff Holt, instrumentation superintendent at New Forest Paper Mills, said: “The gas is processed, the sulphur and other toxic elements of the gas are removed and it is pumped into a buffer tank.
“Some of the gas is used to power our boilers. We use the bio gas in place of natural gas to make steam which goes to our driers. These dry the pulp as it is rolled out into sheets.
“As the gas flows into the buffer tank, surplus gas that is not burnt in the heaters is flared off to prevent a critical build up in the tank. The gas produced from the bioreactor provides 6% of the total amount of gas used to heat the paper driers. In this way we reduce our carbon footprint, gain more CO2 credits and lower our operating costs by reducing the amount of natural gas we need to buy.
“We selected the Optiswirl 4070C vortex flowmeter to measure methane gas coming from our bioreactor because we needed a versatile flowmeter to operate at rates of flow that can be as low as 50-60 cubic metres per minute and as high as 600.”
The 4070C has been designed for robustness with integrated pressure and temperature measurement. It incorporates the company’s ISP (intelligent signal processing) technology which eliminates unwanted signal noise to deliver precise, stable measurement. The meter is designed to measure accurately the operating flow, volumetric flow and mass flow of conductive and non-conductive materials. These materials can be liquids, gases or vapours and the instrument can handle fluctuations in material pressures and temperatures.
With a simple to use, intuitive menu and plug-and-play set-up, the Optiswirl is quick to configure; PACTware is fitted as standard and the modular design allows electronics to be replaced easily.
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