BIO ENERGY
Its evaporation systems are frequently integrated
with waste heat sources to achieve an effective and sustainable process, whichmaximises energy efficiency and reduces running costs. Using its 40 years of experience, HRS now offers a range of evaporation systems, although bespoke solutions are also available. These systems include:
• HRS corrugated tube evaporation systems These are designed for the evaporation of low viscosity effluents with reduced particle size, like wastewater, brines, and effluents with low concentrations of organic solids. These systems utilise HRS K Series corrugated heat exchangers as evaporatormodules, providing high heat transfer and good resistance against fouling.
• HRS scraped surface evaporation systems When concentrating fluids with elevated viscosities (which lowers heat transfer) or those which have a higher fouling risk, such as organic solutions with high drymatter concentration, HRS uses its HRS Unicus Series of reciprocating scraped-surface heat exchangers for evaporation systems.
• HRS Digestate Concentration System The HRS Digestate Concentration System (DCS) is specifically designed to reduce the volume of digestate from anaerobic digestion (AD) systems. In most situations the process utilises surplus heat from the CHP engine. The DCS works by superheating digestate in a vacuum to facilitate concentration, using evaporation to significantly reduce digestate volumes while, at the same
time, increasing the nutrient content and commercial value. The HRS DCS is amulti-effect system, in which
the steam produced from this first heating cycle is re-used as the heatingmedia for the second, and
1
https://datatopics.worldbank.org/what-a-waste/
2
https://www.openaccessgovernment.org/unlocking-organic-waste-greener-future-circular-economy/133112/ 3
https://www.ars.usda.gov/research/publications/publication/?seqNo115=364421
UN FAO: Tackling Climate Change through Livestock,
https://www.fao.org/publications/card/en/c/030a41a8-3e10-57d1-ae0c- 86680a69ceea/ 5
4
https://www.compostnetwork.info/policy/circular-economy/
subsequent, effects. The number of effects is determined by the level of dry solids required, and the amount of spare heat available, up to a maximum of four cycles. After the final effect, the steam is condensed back into water and can then be used to dilute feedstock going into the front end of the digester, creating a completely closed loop system. The DCS is wholly self- sufficient – no energy or water is brought in or wasted, and everything is re-used. Around the world, HRS is working with partners across the livestock supply and processing chain to help them reduce disposal costs, create value added co-products, and reclaim clean water from organic waste streams. Some of these companies are now selling high value fertiliser products into both professional and amateur markets, while the use of biogas for energy (for heat, electrical power or use as renewable natural gas) continues to increase globally. In addition to this, more and more companies are also looking to extract valuable products from organic waste streams, such as struvite and phosphate.
HRS Heat Exchangers
www.hrs-heatexchangers.com
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