Ontwerp en implementatie van een biogaszuiverings- en compressiesysteem in Kimbiji, Tanzania
- KennethDries
1. Inleiding
In veel delen van Tanzania blijft de toegang tot betrouwbare, schone en betaalbare energie een uitdaging. Traditionele energiebronnen zoals hout en houtskool zijn niet alleen inefficiënt, maar dragen ook bij aan ontbossing, luchtverontreiniging en gezondheidsproblemen. Biogas, geproduceerd via anaerobe vergisting van organisch afval, biedt een duurzaam alternatief. Echter bevat biogas aanzienlijke hoeveelheden koolstofdioxide (CO₂) en waterstofsulfide (H₂S), wat het ongeschikt maakt voor directe huishoudelijke toepassingen zonder opwaardering.
Dit onderzoek richt zich op de ontwikkeling van een geïntegreerd systeem voor biogaszuivering, compressie en opslag, specifiek ontworpen voor afgelegen gebieden zonder toegang tot het elektriciteitsnet. De case study vindt plaats op een testsite in Kimbiji (Figuur 1(a)), in samenwerking met Ardhi University, waar biogas wordt geproduceerd als onderdeel van een breder ‘waste-to-resources’-initiatief.
(a) De volledige Kimbiji setup (b) De biogas vergister
Figuur 1: De Kimbiji test site
2. Methodologie & literatuuronderzoek
Het systeem werd ontworpen voor een anaerobe vergister (Figuur 1(b)) met een productiecapaciteit van ongeveer 100 l biogas per dag. De ruwe gassamenstelling bestaat gemiddeld uit 64% CH₄, 35% CO₂ en 260 ppm H₂S. Het doel van het systeem is het verhogen van het methaangehalte tot minstens 75% en het reduceren van CO₂ en H₂S tot maximaal respectievelijk 25% en 5 ppm.
Het project begint met een uitgebreide literatuurstudie naar technologieën voor biogasopwaardering, compressie, distributie, en energievoorziening. Daarbij worden verschillende methoden voor gaszuivering geëvalueerd, waaronder waterscrubbing en chemische absorptie met calciumhydroxide (Ca(OH)₂), evenals methodes voor H2S verwijdering zoals het gebruik van geactiveerde kool, ijzeroxide granulaat en (verroeste) staalwol. Deze materialen zijn lokaal verkrijgbaar en verwijderen de H2S door het te absorberen.
3. Universiteitsopstelling
De implementatie van het systeem werd in twee fasen uitgevoerd: eerst op universiteitsniveau om het ontwerp in een gecontroleerde omgeving te testen, en vervolgens op de Kimbiji-site waar het systeem werd onderworpen aan realistische omstandigheden. Op de universiteit werd na de literatuurstudie een testopstelling gebouwd om de verschillende methoden te testen en met elkaar te vergelijken. De volledige setup wordt getoond in Figuur 2.
Figuur 2: De uiteindelijke opstelling op de universiteit
Van de geteste zuiveringsmaterialen bleek verroest staalwol, ondanks een iets lagere efficiëntie dan gegranuleerd ijzeroxide (H₂S gereduceerd tot 7 ppm tegenover 3 ppm), de meest economische en lokaal beschikbare optie. Deze 7 ppm is niet onder de maximumconcentratie van 5 ppm, de efficientie kan verhoogd worden door gebruik van meer verroest staalwol.
Ca(OH)₂ absorptie reduceerde de CO₂-concentratie van 35% tot gemiddeld 16%, met een verwijderingsefficiëntie van 61%. Waterscrubbing toonde betere prestaties bij hogere drukken, met een minimale CO₂-waarde van 14%, maar bereikte hierbij wel zijn hydraulische limiet al op 5 bar. Bovendien verbruikte de waterscrubbingsinstallatie significant meer energie. De Ca(OH)₂ opstelling zal geïmplementeerd worden in Kimbiji.
4. Kimbiji opstelling
Voor de Kimbiji opstelling is er een vrijstaande energiebron nodig, aangezien er geen toegang is tot het elektriciteitsnet. Een zonne-energiesysteem werd hier ontworpen bestaande uit fotovoltaïsche panelen en een loodaccu-opslag. Dit systeem voorziet voldoende energie, zelfs bij ongunstige weersomstandigheden, om de zuiverings- en compressie-eenheden continu te laten functioneren. De resultaten worden weergegeven in Tabel 1.
Tabel 1: Initieel en finale samenstelling van het biogas
Het gezuiverde biogas werd gecomprimeerd tot 8 bar met behulp van een zuigercompressor en opgeslagen in herbruikbare LPG-cilinders, geschikt om het dan te distribueren en gebruiken op huishoudelijk niveau.
5. Kennisoverdracht en lokale Inbedding
Tijdens de implementatie aan Ardhi University werd een kennisoverdrachtstraject opgezet voor lokale studenten en technici. Praktische trainingen, handleidingen en instructievideo’s werden ontwikkeld om het systeem duurzaam beheersbaar te maken door de gemeenschap zelf. Hierdoor werd niet alleen de technische duurzaamheid versterkt, maar ook het draagvlak voor lokale toepassing.
6. Techno-economische analyse
Parallel aan de technische ontwikkeling en implementatie is een gedetailleerde techno-economische analyse uitgevoerd om de financiële haalbaarheid van het systeem te evalueren. Hierbij werd het gerealiseerde kleinschalige systeem (100 l biogas per dag), vergeleken met een voorgesteld grootschalig alternatief dat tot 6 500 l biogas per dag zou kunnen verwerken. Deze opstelling is ontworpen om de volledige biogasproductie op de site in Kimbiji te verwerken. Uit de analyse bleek dat het kleinschalige systeem een genivelleerde kostprijs (Levelized Cost of Energy, LCOE) heeft van ongeveer1 572 TZS/KWh (0,52 EUR/KWh). Deze hoge kostprijs maakt het systeem op kleine schaal economisch onaantrekkelijk, zeker in vergelijking met conventionele energiebronnen zoals LPG.
Het grootschalige systeem toonde daarentegen een aanzienlijk lagere LCOE van 241 TZS/KWh (0,08 EUR/KWh). Dit plaatst het op een niveau dat financieel haalbaar is en competitief met commerciële alternatieven zoals LPG (270 TZS/kWh). Daarnaast werden twee aanvullende scenario’s geanalyseerd: een installatie gebaseerd op enkel zonne-energie en een hybride configuratie die zowel biogas als zonne-energie benut. Deze oplossingen realiseerde een aanzienlijk lagere LCOE van respectievelijk 649 TZS/kWh en 810 TZS/kWh in vergelijking met de kleinschalige opstelling. Deze bevindingen geven aan dat hoewel kleinschalige biogaszuivering niet rendabel is, de economische rendabiliteit significant toeneemt bij schaalvergroting of integratie met andere hernieuwbare energiebronnen (zie Figuur 3).
Figuur 3: LCOE van verschillende energiebronnen
7. Duurzaamheid en schaalbaarheid
Naast economische haalbaarheid werd in dit project ook uitgebreid aandacht besteed aan de ecologische en maatschappelijke duurzaamheid van het systeem. Het gebruik van biogas sluit aan bij meerdere Duurzame Ontwikkelingsdoelstellingen (SDG’s), waaronder doelstelling 7 (betaalbare en duurzame energie), doelstelling 13 (klimaatactie) en doelstelling 15 (leven op het land).
Het systeem is specifiek ontworpen met het oog op toepassing in rurale en afgelegen gebieden. Alle componenten zijn lokaal beschikbaar en het ontwerp maakt gebruik van robuuste technologieën die weinig onderhoud vereisen. Bovendien is de bediening relatief eenvoudig, waardoor ook niet-technische gebruikers ermee overweg kunnen. Door lokale studenten te betrekken bij het ontwerp, de opbouw en het onderhoud van het systeem is er gezorgd voor voldoende kennisoverdracht en lokale verankering.
8. Conclusie
Het ontwikkelde biogaszuiverings- en compressiesysteem toont aan dat technische en ecologische duurzaamheid ook op kleinschalig niveau haalbaar is. Ondanks de huidige financiële beperkingen van kleinschalige toepassingen, biedt het project een waardevol kader voor toekomstige grootschalige energietoepassingen in ontwikkelingscontexten. De combinatie van technische robuustheid, lokale betrokkenheid en duurzaamheid maakt het systeem niet alleen toepasbaar in Kimbiji, maar ook elders waar de nood aan schone, betaalbare energie groot is.
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