Why must biogas be desulphurised in a CHP unit? | Stromfeee="description" content="Why must biogas be desulphurised in a CHP unit? H2S above 500 ppm damages engine bearings (sulphuric acid corrodes metal surfaces) and irreversibly poisons oxidation catalysts; biological treatment"> <link rel="canonical" href="https://stromfee-mauritius.ai/en/glaesern/cogeneration/wizards/frage_entschwefelung_notwendig/"> <script type="application/ld+json">{"@context": "https://schema.org", "@type": "Article", "headline": "Why must biogas be desulphurised in a CHP unit?", "mainEntityOfPage": "/glaesern/cogeneration/wizards/frage_entschwefelung_notwendig.html", "description": "H2S over 500 ppm damages motor bearings (sulphuric acid corrodes metal surfaces) and poisons oxidation catalysts irreversibly; biological desulphurisation (2–4 % air into the gas space) followed by"}</script> <script type="application/ld+json">{"@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{"@type": "Question", "name": "What happens when H2S concentrations exceed 500 ppm in the CHP unit?", "acceptedAnswer": {"@type": "Answer", "text": "From 500 ppm, hydrogen sulphide leads to the formation of sulphuric acid, which corrodes metal surfaces such as engine bearings and destroys mechanical integrity."}}, {"@type": "Question", "name": "Why is desulphurisation necessary for the catalyst?", "acceptedAnswer": {"@type": "Answer", "text": "H2S irreversibly poisons oxidation catalysts; once the catalyst is deactivated, the CHP unit can no longer comply with legal emission standards."}}, {"@type": "Question", "name": "From what value must biogas be mandatorily desulphurised?", "acceptedAnswer": {"@type": "Answer", "text": "To guarantee engine life and prevent after-treatment poisoning, the H2S content must be reliably maintained below 50 ppm."}}, {"@type": "Question", "name": "How does biological desulphurisation work in a CHP unit?", "acceptedAnswer": {"@type": "Answer", "text": "The controlled supply of 2 to 4 % air into the gas space promotes bacterial growth, which oxidises hydrogen sulphide into elemental sulphur."}}, {"@type": "Question", "name": "Why is an activated carbon filter alone often not enough?", "acceptedAnswer": {"@type": "Answer", "text": "An activated carbon filter serves as a polishing step; biological pre-treatment is necessary to avoid immediately exhausting the capacity of the carbon bed due to high H2S loads."}}, {"@type": "Question", "name": "What is the difference between desulphurisation and cleaning?", "acceptedAnswer": {"@type": "Answer", "text": "While cleaning generally improves gas quality, desulphurisation specifically aims to remove hydrogen sulphide to prevent corrosion and catalyst poisoning."}}]}</script> <style>:root{--bg:#fdfcff;--bg-soft:#faf8ff;--surface:#fff;--text:#1d1d1f;--text-2:#515154;--text-3:#86868b;--border:#fed7aa;--border-soft:#efeaf8;--accent:#f97316;--accent-bright:#fdba74;--accent-dim:rgba(234,88,12,.08);--emerald:#ea580c;--font:'Inter',-apple-system,sans-serif;--mono:'JetBrains 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.wiz-next{background:linear-gradient(135deg,var(--accent),var(--accent-bright));color:#fff;border:0;border-radius:999px;padding:.85rem 1.6rem;font-weight:800;font-size:1rem;cursor:pointer;box-shadow:0 10px 26px rgba(249,115,22,.28);text-decoration:none;display:inline-flex;align-items:center;gap:.5rem} .wiz-next:hover{transform:translateY(-1px)} .benefit{background:linear-gradient(135deg,#fff7f0,#fff);border:1px solid var(--accent-ultra);border-radius:18px;padding:1.3rem 1.4rem;margin:.2rem 0 1.1rem} .benefit h3{margin:0 0 .5rem;font-size:1.2rem;font-weight:800;color:var(--text,#1d1d1f)} .benefit p{margin:0;color:var(--text-2,#515154);line-height:1.6}</style></head><body> <header class="site"><div class="wrap navrow"> <a class="brand" href="/glaesern/">◈ Transparent CHP</a> <nav class="nlinks"><a href="/glaesern/">All trades</a> <a href="/glaesern/cogeneration/gasstrecke.html">Gas line</a></nav> <a class="navcta" href="#kontakt">Installation check →</a></div></header> <div class="hero-w"><h1>Why must biogas be desulphurised?</h1><p>Component assistant · Gas line</p> <div class="livebar"><span class="livedot"></span><b id="lcount2">…</b>Live values from the plant ·<span id="lts2"> verbinde… </span></div></div> <div class="wiz-wrap"> <div id="steps"> <div class="st" data-s="1"><span class="no">1</span> Comprendre </div> <div class="st" data-s="2"><span class="no">2</span>View live</div> <div class="st" data-s="3"><span class="no">3</span>What AI does</div> <div class="st" data-s="4"><span class="no">4</span>Your benefit</div> </div> <div id="body"></div> </div> <div class="sec"><h2>Diagram — Process & sensors live</h2><p class="lead">The path through the domain, with the actual measurement points of the installation.</p><svg viewBox="0 0 920 300" style="width:100%;height:auto;background:#fdfcff;border:1px solid #fed7aa;border-radius:16px"><defs><linearGradient id="bx" x1="0" y1="0" x2="0" y2="1"><stop offset="0" stop-color="#fff"/><stop offset="1" stop-color="#fff7ed"/></linearGradient><marker id="ar" markerWidth="8" markerHeight="8" refX="6" refY="3" orient="auto"><path d="M0,0 L6,3 L0,6 Z" fill="#f97316"/></marker></defs><text x="20" y="30" font-size="14" font-weight="800" fill="#ea580c">Gas line — Process diagram</text><text x="20" y="48" font-size="10.5" fill="#86868b">orange = live plant sensor · flow from left to right</text><line x1="138" y1="152" x2="268" y2="152" stroke="#f97316" stroke-width="2.5" marker-end="url(#ar)"/><line x1="392" y1="152" x2="522" y2="152" stroke="#f97316" stroke-width="2.5" marker-end="url(#ar)"/><line x1="646" y1="152" x2="776" y2="152" stroke="#f97316" stroke-width="2.5" marker-end="url(#ar)"/><g><rect x="20" y="120" width="118" height="64" rx="12" fill="url(#bx)" stroke="#fdba74" stroke-width="1.5"/><text x="79" y="148" text-anchor="middle" font-size="13" font-weight="700" fill="#1d1d1f">Gas pipeline</text></g><g><rect x="274" y="120" width="118" height="64" rx="12" fill="url(#bx)" stroke="#fdba74" stroke-width="1.5"/><text x="333" y="148" text-anchor="middle" font-size="13" font-weight="700" fill="#1d1d1f"><tspan x="333" dy="-4"></tspan><tspan x="333" dy="14">Gas control circuit</tspan></text><text x="333" y="170" text-anchor="middle" font-size="10.5" fill="#86868b"> Pression </text></g><g><rect x="528" y="120" width="118" height="64" rx="12" fill="url(#bx)" stroke="#fdba74" stroke-width="1.5"/><text x="587" y="148" text-anchor="middle" font-size="13" font-weight="700" fill="#1d1d1f">Gas mixer</text><text x="587" y="170" text-anchor="middle" font-size="10.5" fill="#86868b"> Air+Gaz </text></g><g><rect x="782" y="120" width="118" height="64" rx="12" fill="url(#bx)" stroke="#fdba74" stroke-width="1.5"/><text x="841" y="148" text-anchor="middle" font-size="13" font-weight="700" fill="#1d1d1f">Engine inlet</text></g><line x1="79" y1="120" x2="79" y2="88" stroke="#ea580c" stroke-width="1.5" stroke-dasharray="3 2"/><circle cx="79" cy="120" r="3.5" fill="#ea580c"/><g transform="translate(79,58)"><rect x="-52" y="0" width="104" height="30" rx="8" fill="#fff" stroke="#ea580c" stroke-width="1"/><text x="0" y="12" text-anchor="middle" font-size="8.5" fill="#86868b">Gas quantity</text><text x="0" y="25" text-anchor="middle" font-size="12" font-weight="700" fill="#ea580c" class="svlive" data-k="sbhkw2_rgasmenge" data-u="m³/h">…</text></g><line x1="333" y1="120" x2="333" y2="88" stroke="#ea580c" stroke-width="1.5" stroke-dasharray="3 2"/><circle cx="333" cy="120" r="3.5" fill="#ea580c"/><g transform="translate(333,58)"><rect x="-52" y="0" width="104" height="30" rx="8" fill="#fff" stroke="#ea580c" stroke-width="1"/><text x="0" y="12" text-anchor="middle" font-size="8.5" fill="#86868b">Fill level</text><text x="0" y="25" text-anchor="middle" font-size="12" font-weight="700" fill="#ea580c" class="svlive" data-k="sbhkw2regel_riwgasfuellstmw" data-u="%">…</text></g><line x1="587" y1="120" x2="587" y2="88" stroke="#ea580c" stroke-width="1.5" stroke-dasharray="3 2"/><circle cx="587" cy="120" r="3.5" fill="#ea580c"/><g transform="translate(587,58)"><rect x="-52" y="0" width="104" height="30" rx="8" fill="#fff" stroke="#ea580c" stroke-width="1"/><text x="0" y="12" text-anchor="middle" font-size="8.5" fill="#86868b"> Mélangeur </text><text x="0" y="25" text-anchor="middle" font-size="12" font-weight="700" fill="#ea580c" class="svlive" data-k="sbhkw2_rgasmischer_pos" data-u="%">…</text></g></svg></div> <div class="sec"><div class="block"><h3>Thus we connect — read only</h3><p class="step-p">The value comes from<b>Modbus TCP · Plant PLC · M-Bus (meters)</b>of the installation —<b>read, not monitored</b>. Everything is<b>in the house</b>calculated, nothing leaves the house. No obligation to disclose operational data.</p></div><div class="block"><h3>Your own LLM for BHKW — offline</h3><p class="step-p">Questions in plain language, answered by<b>Your own installation data</b>— local, without cloud. The AI runs internally; the installation remains yours.</p></div><div class="note"><b>Regulatory framework:</b>DVGW G 260 (gas quality) · DVGW G 262 (biogas injection)</div><div class="block"><h3>Associated causal chains</h3><p class="step-p">This component is part of<a href="https://bhkw-anlagen.com/kausalketten.html" style="color:var(--accent)">Installation causal chains</a>— from cause to effect (gas quality → engine → exhaust gas → heat → efficiency). The AI reads the entire chain, not just the individual value.</p></div><div class="block"><h3>Link with the entire installation</h3><p class="step-p">A BHKW is never alone: electricity, heat and gas are linked, and with PV and battery storage, it becomes a system. The AI calculates the entire installation.</p><div style="display:flex;gap:.6rem;flex-wrap:wrap;margin-top:.6rem"><a href="/glaesern/cogeneration/" style="font-size:.85rem;padding:.4rem .9rem;border:1px solid var(--border);border-radius:999px;text-decoration:none;color:var(--accent)">Transparent BESS →</a><a href="/glaesern/hotel/" style="font-size:.85rem;padding:.4rem .9rem;border:1px solid var(--border);border-radius:999px;text-decoration:none;color:var(--accent)">Gläsernes Hotel →</a><a href="/fr/pv-watcher/" style="font-size:.85rem;padding:.4rem .9rem;border:1px solid var(--border);border-radius:999px;text-decoration:none;color:var(--accent)">PV-Watcher →</a></div></div></div><div class="sec faqsec"><h2>Frequently Asked Questions</h2><details><summary>What happens during H2S concentrations above 500 ppm in the BHKW?</summary><div class="faq-a">From 500 ppm, hydrogen sulfide leads to the formation of sulfuric acid, which corrodes metal surfaces such as engine bearings and destroys mechanical integrity.</div></details><details><summary>Why is desulfurization necessary for the catalyst?</summary><div class="faq-a">H2S irremediably poisons oxidation catalysts; once the catalyst is deactivated, the BHKW can no longer comply with legal emission standards.</div></details><details><summary>From what value must biogas be mandatorily desulfurised?</summary><div class="faq-a">To guarantee engine lifespan and prevent after-treatment poisoning, the H2S content must be reliably maintained below 50 ppm.</div></details><details><summary>How does biological desulfurization work in a BHKW unit?</summary><div class="faq-a">The controlled input of 2 to 4% air into the gas space promotes bacterial growth, which oxidises hydrogen sulfide into elemental sulfur.</div></details><details><summary>Why is an activated carbon filter alone often not enough?</summary><div class="faq-a">An activated carbon filter serves as a polishing step; biological pretreatment is necessary to avoid immediately exhausting the capacity of the carbon bed due to high H2S loads.</div></details><details><summary>What is the difference between desulfurization and cleaning?</summary><div class="faq-a">While cleaning generally improves gas quality, desulfurization specifically aims to remove hydrogen sulfide to prevent corrosion and catalyst poisoning.</div></details></div> <footer class="site"><div class="wrap"> <div class="fbrand">◈ Transparent BHKW</div> <p class="fclaim">Connected in read-only mode · local calculation · without cloud. The installation remains at your site.</p> <nav class="flinks"><a href="/glaesern/">All trades</a> <a href="/glaesern/cogeneration/gasstrecke.html">Gas line</a> <a href="https://bhkw-anlagen.com/impressum.html">Legal notice</a> <a href="https://bhkw-anlagen.com/datenschutz.html">Data protection</a></nav> <div class="fcopy">© 2026 HR Energiemanagement GmbH · 32257 Bünde · +49 5223 4921030</div> </div></footer> <script> var state={step:1}; function li(t){return '<li>'+t+'</li>';} function nav(s){var b=s>1?'<button class="wiz-back" onclick="go('+(s-1)+')">← Back</button>':'<span></span>'; var n=s<4?'<button class="wiz-next" onclick="go('+(s+1)+')">Next →</button>':'<button class="wiz-next" onclick="go(1)">From the beginning</button>'; return '<div class="wiz-nav">'+b+n+'</div>';} function step1(){return '<div class="step-grid"><img class="step-img" src="../img/frage_lm_notwendig.html" alt="Question">'+ '<div class="step-grid"><div><p class="step-kicker">Step 1 · Understanding</p>'+ '<h2 class="step-h">What is "Why must biogas be desulphurised?"</h2>'+nav(1);} function step2(){return '<p class="step-p">H2S above 500 ppm damages motor bearings (sulphuric acid corrodes metal surfaces) and irreversibly poisons oxidation catalysts; biological desulphurisation (2–4 % air into the gas stream) followed by an activated carbon filter keeps H2S reliably below 50 ppm.</p>'+nav(2);} function step3(){return '<p class="step-kicker">Step 2 · See live</p>'+ '<h2 class="step-h">The plant — right now</h2>'+li('<div class="live-head"><span class="livedot"></span><span class="live-status" id="lstatus">connecting...</span><span class="live-sub">· anonymous reference plant · read-only from the control system, calculated in-house</span></div>')+li('<div class="kpis"><div class="kpi hl" data-k="sbhkw2_rgasmenge"><div class="kl">Gas quantity</div><div class="kval"><span class="v">…</span><span class="ku">m³/h</span></div><div class="spark"></div></div><div class="kpi" data-k="sbhkw2_rgasmischer_pos"><div class="kl">Gas mixer</div><div class="kval"><span class="v">…</span><span class="ku">%</span></div><div class="spark"></div></div><div class="kpi" data-k="sbhkw2regel_riwgasfuellstmw"><div class="kl">Gas level</div><div class="kval"><span class="v">…</span><span class="ku">%</span></div><div class="spark"></div></div><div class="kpi" data-k="sbhkw2_rladedruck"><div class="kl">Charge pressure</div><div class="kval"><span class="v">…</span><span class="ku">bar</span></div><div class="spark"></div></div>')+li('<p class="step-p" style="margin-top:1rem">Excerpt from <b id="lcount">…</b> of the plant\'s measured values. For the detailed <a href="https://bhkw-anlagen.com/erklaervideo/frage_entschwefelung_notwendig.html" style="color:var(--accent)">explanation page with video →</a></p>')+li('<div class="step-grid"><div><p class="step-kicker">Step 3 · What the AI does</p>')+'</ul></div>'+ '<h2 class="step-h">What the AI reads from these values</h2>'+ '<ul class="chk">'+ 'H2S concentration above 500 ppm as a <b>critical threshold</b> for corrosion of motor bearings'+ 'Measured values > 100 ppm as an indicator of <b>imminent destruction of oxidation catalysts</b>'+nav(3);} function step4(){return 'Drop in exhaust gas treatment efficiency due to <b>irreversible poisoning of the catalyst</b>'+ 'Need for a target concentration below 50 ppm to <b>guarantee installation availability</b>'+ '<img class="step-img" src="../img/ki-gasstrecke.jpg" alt="AI monitoring">'+ '<div class="szen szen-grid"><img class="szen-img" src="../img/szen-gasstrecke.jpg" alt="Scenario" loading="lazy"><div><p class="mon">Monitored: continuously · Pressure, methane content, fill level</p>'+nav(4);} function r(){var v=[];for(var i=0;i<2;i++){var e=document.getElementById('c'<p class="step-p"><b>The scenario:</b> the amount of methane decreases slowly, the engine begins to knock without an alarm, drop in power and wear.<br>'o');if(o)o.textContent=(Math.round(res*100)/100).toLocaleString('de-DE'<b>The AI:</b> detects the quality trend early and reports it before the knocking causes damage. <b>It identifies the trend before the limit is reached.</b></p></div></div>'body'<p class="step-kicker">Step 4 · Your benefit</p>'#steps .st'<h2 class="step-h">Why this is important</h2>'data-s');el.classList.toggle('on',n===state.step);el.classList.toggle('done'<div class="benefit"><h3>Reducing H2S to below 50 ppm prevents costly downtime due to material fatigue and protects the investment in exhaust gas treatment.</h3><p>By using a combination of biological desulphurisation (2–4 % air supply) and activated carbon filters, stable gas quality is guaranteed. This ensures the operational safety of the CHP unit and significantly extends maintenance intervals.</p></div>'smooth'});} document.querySelectorAll('#steps .st').forEach(function(el){el.style.cursor='pointer';el.onclick=function(){go(+el.getAttribute('data-s'<div class="calcbox"><p class="step-p">Gas quantity (m³/h) <input id="c0" type="number" step="any" value="200" oninput="r()"> · Methane content (%) <input id="c1" type="number" step="any" value="52" oninput="r()"> → <b><span id="o" style="color:var(--accent)">—</span> kWh/h</b></p>'https://bhkw-anlagen.com/data/sensor-live.json',HURL='https://bhkw-anlagen.com/data/sensor-history.json',LKEY='sbhkw2_rgasmenge'<p class="mon" style="margin-top:.5rem">Calculation: Gas quantity × Methane content × 9.97 kWh/m³ (Methane calorific value)</p></div>'vor '+a+' s'):('vor '+Math.round(a/60)+' min');}function fmt(v){return (typeof v==='number')?(Math.round(v*100)/100).toLocaleString('de-DE'):v;}function spark(el,ser){if(!ser||!ser.length)return;var nz=ser.filter(function(x){return x!==0;});if(nz.length<2){el.innerHTML=''+i);v.push(e?parseFloat(e.value)||0:0);}','+(h-2-(y-mn)/rg*(h-4)).toFixed(1);}).join(' ');el.innerHTML='<svg viewBox=\'0 0 '+w+' '+h+');}'+').innerHTML=state.step===1?step1():state.step===2?step2():state.step===3?step3():step4();'+pts+'\'/></svg>';}window.__fillLive=function(){var d=LIVEDATA;if(!d)return;var c=d.count||Object.keys(d.sensors||{}).length;var e=document.getElementById('lcount2');if(e)e.textContent=c;var e2=document.getElementById('lcount');if(e2)e2.textContent=c;var st=document.getElementById('lstatus');document.querySelectorAll('.kpi[data-k]').forEach(function(card){var k=card.dataset.k;var s=d.sensors&&d.sensors[k];var vel=card.querySelector('.v');if(s&&vel)vel.textContent=fmt(s.v);if(HISTDATA&&HISTDATA.sensors){spark(card.querySelector('.spark'),HISTDATA.sensors[k]);}});document.querySelectorAll('.svlive[data-k]').forEach(function(el){var n=+el.getAttribute(' '+el.dataset.u):'',n<state.step);});'Anlage läuft · '+fmtAge(s0.age||0)):'Anlage'));};});'lts2');if(t2)t2.textContent='aktualisiert ',LIVEDATA=null,HISTDATA=null;function fmtAge(a){return a<90?('lv');if(lv&&s0){lv.textContent=fmt(s0.v)+(s0.u?(' '+s0.u):'';return;}var mn=Math.min.apply(0,ser),mx=Math.max.apply(0,ser),rg=(mx-mn)||1;var n=ser.length,w=100,h=26,pts=ser.map(function(y,i){return (i/(n-1)*w).toFixed(1)+'ll'\' preserveAspectRatio=\'none\' style=\'width:100%;height:100%\'>'lts');if(lt&&s0)lt.textContent='Stand '+(s0.ts||'')+' · '+fmtAge(s0.age||0);};function pullLive(){fetch(LURL,{cache:'no-store'}).then(function(r){return r.json();}).then(function(d){LIVEDATA=d;window.__fillLive();}).catch(function(){var t=document.getElementById('lstatus');if(t)t.textContent='Live nicht erreichbar';});}if(HURL){fetch(HURL,{cache:'no-store'}).then(function(r){return r.json();}).then(function(d){HISTDATA=d;window.__fillLive();}).catch(function(){});}pullLive();setInterval(pullLive,30000); </script></body></html>