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Plant sizing

Plant sizing. PPRE Oldenburg University biogas compact course April 26 – 28, 2011. Parameters I. Parameters II. Plant lay out. Compensation volume. Gas storage volume. Digester volume. Size 1: min sub fee; min fee. M inimum daily substrate feeding :

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Plant sizing

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  1. Plant sizing PPRE Oldenburg Universitybiogas compact courseApril 26 – 28, 2011

  2. Parameters I

  3. Parameters II

  4. Plant lay out Compensation volume Gas storage volume Digester volume

  5. Size 1: min sub fee; min fee • Minimum daily substrate feeding: min sub fee1 = min gas prod1 / spec gas prod. min sub fee1 = 1.00 / 0.040 = 25 [kg dung day] • 25 [kg dung / day] requires (1:1 dung to water ratio) equal amount of water. min fee1 = 50 [ltr / day]

  6. Size 1: dig vol; max fee; max gas prod • Min feeding : max HRT. dig vol1 = HRTmax x min fee1. dig vol1 = 60 x 50 = 3,000 [ltr] • Max feeding : min HRT. max fee1 = dig vol / HRTmin max fee1 = 3,000 / 40 = 75 [ltr/day] Then, max sub fee = 37.5 [kg/day] • max gas prod1 = max sub fee1 x spec gas prod. max gas prod1 = 37.5 x 0.040 = 1.5 [m3 biogas/day]

  7. Size 1: gas stor vol; main dimensions • gas storage volume set on 60% of maximum daily gas production gas stor vol1 = 0.6 x 1.5 = 0.9 [m3] • main dimensions of plant size 1: • Digester volume: 3,00 m3 • Gas storage volume: 0.90 m3 • Total plant volume: 3.90 m3

  8. Size 2: min fee, min gas prod; max fee • Range of plant sizes: • min sub fee2 = max sub fee1. max fee2 = 37.5 [kg dung/day]. • min gas prod2 = max gas prod1 min gas prod2 = 37.5 x 0.040 = 1.5 [m3 biogas/day] • dig vol2 = HRTmax x min fee2. dig vol2 = 60 x 75 = 4,500 [ltr] • max fee2 = dig vol2 / HRTmin max fee1 = 4,500 / 40 = 112,5 [ltr/day] max sub fee2 = 56.25 [kg dung/day]

  9. Size 2: max gas prod; gas stor vol, main dim • max gas prod2 = max sub fee2 x spec gas prod. max gas prod2 = 56.25 x 0.040 = 2.25 [m3 biogas/day] • gas storage volume gas stor vol2 = 0.6 x 2.25 = 1.35 [m3] • main dimensions • Digester volume: 4,50 m3 • Gas storage volume: 1.35 m3 • Total plant volume: 5.85 m3 • Etc …:

  10. Size range:

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