Gas analysis for the process control of biogas plants
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1 Gas analysis for the process control of biogas plants Dr. agr. Markus Schlattmann Folie 1
2 Agenda AWITE Bioenergie GmbH Gas analysis technology Process control using gas analysis technology It s time for you to take control. Folie 2
3 AWITE Company History Company foundation first gas analysis system for H 2 S meas. in biogas First office with integriated production~20 m² New office and workshop building ~700 m² Gas analysis system AwiFLEX Cool Gas analysis system 1600 Gas analysis systems 30 Employees Folie 3
4 AWITE - Scope of Work Gas analysis systems Development Planning Production Startup Maintenance/Service/ Support Automation Process control, visualisation and software development Switching cabinets (Subcontractor) Cabeling on site Service Measuring equipment Planning Installation Startup Service Folie 4
5 AWITE - Impressions Folie 5
6 Agenda AWITE Bioenergie GmbH Gas analysis technology Process control using gas analysis technology It s time for you to take control. Folie 6
7 Gas analysis systems AwiFLEX Cool+ and AwiECO Folie 7
8 Gas analysis systems AwiFLEX Cool+ and AwiECO AwiFLEX Cool+ Personalised, versatile, expendable Individual sensor equipment Any number of measuring points Profibus, Profinet, Ethernet, RS232, RS485, USB, analog, GPRS/UMTS Gas cooling (drying) Desulfurization, autocalibration, remote control Connection of additional sensors Calculations AwiECO Reliable, affordable, standardised CH 4, H 2 S, O 2, one measuring point or 2 x H 2 S, two measuring points Analog outputs, Ethernet, (Profibus) USB-interface and software AwiView Discontinuous measurement Folie 8
9 Internal Construction 1: Power section (incl. AwiProtect) & Profibus module 2: AwiMox & SPS-Modul AwiCore 3: Gas cooler AwiCool 4: Infrared sensors (CH 4 & CO 2 ) & electrochemiacl sensors (H 2 S, O 2, H 2 ) 5: AwiConnect (incl. press. sensor) 6: H 2 S filter,valves, water sensor and gas pump Folie 9
10 Sensors (1) Folie 10
11 Sensors (2) Gas Measuring Range Measuring Principle Repeatability Drift/Year CH 4, CO Vol.-% Infrared double beam P. and T.-correction ± 0,2 Vol.-% ± 1,5 Vol.-% O Vol.-% Electrochemical ± 0,1 Vol.-% ± 2,5 Vol.-% H 2 S H ppm ( ppm) ppm (0-100 Vol.-%) Electrochemical (Indirectly by dilution) Electrochemical (Indirectly by dilution) ± 0,5 bis ± 50 ppm ± 25 bis ± 500 ppm ± 2,5 bis ± 300 ppm ± 65 bis ± ppm Folie 11
12 Infrared Sensor Measuring signal IR Emitter Reference signal Folie 12
13 Electrochemical Sensor Electrolyte Elektrolyt Counter electrode Gegenelektrode Membrane Membran Gas Gas Reference electrode Referenzelektrode Working electrode Arbeitselektrode Folie 13
14 Internal Gas Flow Folie 14
15 Gas Analysis System Implementation Folie 15
16 Gas Analysis System Implementation Folie 16
17 Gas Analysis System Implementation Folie 17
18 Gas Analysis System Implementation Folie 18
19 Gas Analysis Operation 7 Touch-Panel Different tabs and sub-tabs Operation mostly intuitively Folie 19
20 Gas Analysis Data Folie 20
21 Gas Analysis In Practical Use Folie 21
22 Gas Analysis Research Application Folie 22
23 Agenda AWITE Bioenergie GmbH Gas analysis technology Process control using gas analysis technology It s time for you to take control. Folie 23
24 The Anaerobic Digestion Process (COD-flow) Partikul ä res Particulate organisches organic Material matter (100% CSB) Disintegration Inerts Kohlenhydrate Carbohydrates Proteine Proteins Fette Lipids Hydrolysis Monosaccharides Aminos acids ä uren Long langkettige chained Fetts fatty ä uren acids Acidogenesis Zwischenprodukte Intermediates HPr, HBu, HVa Acetogenesis Acetate Wasserstoff Hydrogen Methanogenesis Methane 90% Folie 24
25 The Anaerobic Digestion Process Disintegration Degradable, particulate organic matter Carbohydrates, lipids, proteins Inerts Hydrolysis Acidogenesis Acetogenesis Methanogenesis Folie 25
26 The Anaerobic Digestion Process Disintegration Degradable, particulate organic matter Carbohydrates, lipids, proteins Inerts Hydrolysis Acidogenesis Monosaccharides, disaccharides, amino acids, SC peptides, LC fatty acids, glycerine Acetogenesis Methanogenesis Folie 26
27 The Anaerobic Digestion Process Disintegration Degradable, particulate organic matter Carbohydrates, lipids, proteins Inerts Hydrolysis Acidogenesis Acetogenesis Monosaccharides, disaccharides, amino acids, SC peptides, LC fatty acids, glycerine Volatile fatty acids (acetate, propionate, butyrate), aldehydes, alcohols, ketones, hydrogen sulfide, ammonia, carbon dioxide, hydrogen Methanogenesis Folie 27
28 The Anaerobic Digestion Process - NH 3 Nitrogen urea ammonia proteins peptides amino acids ammonia 2 Alanine 2Glycine 2H O 3ADP 3P 3Acetate CO 3NH i 2 4 3ATP NH NH 4 3 H Folie 28
29 The Anaerobic Digestion Process - H 2 S proteins peptides amino acids hydrogen sulfide sulfur ~ 500 ppm life-threatening within 30 minutes ~ ppm life-threatening within several minutes ~ ppm fatal in a few seconds Folie 29
30 The Anaerobic Digestion Process - H 2 S Toxicity => personal injury => magnitude, monitoring (safety) Corrosion => engine damage => desulfurisation (biological, chemical) => check of desulfurisation performance Folie 30
31 The Anaerobic Digestion Process Disintegration Degradable, particulate organic matter Carbohydrates, lipids, proteins Inert Hydrolysis Acidogenesis Acetogenesis Monosaccharides, disaccharides, amino acids, SC peptides, LC fatty acids, glycerine Volatile fatty acids (acetate, propionate, butyrate), aldehydes, alcohols, ketones, hydrogen sulfide, ammonia, carbon dioxide, hydrogen NH 3 H 2 S Methanogenesis Folie 31
32 The Anaerobic Digestion Process - Acidogenesis C 6 H 12 O H 2 O 2 CH 3 COOH + 2 CO H 2 C 6 H 12 O 6 3 CH 3 COOH C 6 H 12 O 6 CH 3 (CH 2 ) 2 COOH + 2 CO H 2 C 6 H 12 O H 2 2 CH 3 CH 2 COOH + 2 H 2 O C 6 H 12 O 6 CH 3 CH 2 COOH + CH 3 COOH + CO 2 + H 2 C 6 H 12 O 6 + H 2 O CH 3 CH 2 OH + CH 3 COOH + 2 CO H 2 C 6 H 12 O 6 2 CH 3 CHOHCOOH C 6 H 12 O 6 CH 3 CHOHCOOH + CH 3 CH 2 OH + CO 2 Folie 32
33 The Anaerobic Digestion Process - CO 2 Acidification processes Check measurement against methane measurement Folie 33
34 The Anaerobic Digestion Process Disintegration Degradable, particulate organic matter Carbohydrates, lipids, proteins Inerts Hydrolysis Acidogenesis Acetogenesis Methanogenesis Monosaccharides, disaccharides, amino acids, SC peptides, LC fatty acids, glycerine Volatile fatty acids (acetate, propionate, butyrate), aldehydes, alcohols, ketones, hydrogen sulfide, ammonia, carbon dioxide, hydrogen Acetate, carbon dioxide, hydrogen H 2 H 2 S NH CO 2 3 H 2 CO 2 CO 2 CO 2 H 2 Folie 34
35 The Anaerobic Digestion Process - Acetogenesis butyrate CH 3 (CH 2 ) 2 COO H 2 O 2 CH 3 COO - + H H 2 propionate CH 3 CH 2 COO H 2 O CH 3 COO - + H + + HCO H 2 ethanol CH 3 CH 2 OH + H 2 O CH 3 COO - + H H 2 Folie 35
36 The Anaerobic Digestion Process - H 2 Acidification processes Folie 36
37 The Anaerobic Digestion Process Disintegration Degradable, particulate organic matter Carbohydrates, lipids, proteins Inerts Hydrolysis Acidogenesis Acetogenesis Methanogenesis Monosaccharides, disaccharides, amino acids, SC peptides, LC fatty acids, glycerine Volatile fatty acids (acetate, propionate, butyrate), aldehydes, alcohols, ketones, hydrogen sulfide, ammonia, carbon dioxide, hydrogen Acetate, carbon dioxide, hydrogen Methane, carbon dioxide H 2 NH CO 2 H 2 3 CO 2 CO 2 CO 2 H 2 H 2 H 2 S CO CO 2 2 H CO CO H 2 Folie 37
38 The Anaerobic Digestion Process - Methanogenesis Acetoclastic methanogenesis acetate CH 3 COO - + H 2 O CH 4 + HCO - 3 Hydrogenotrophic methanogenesis hydrogen HCO H H 2 CH H 2 O Folie 38
39 The Anaerobic Digestion Process - CH 4 Monitoring of methane formation Folie 39
40 The Anaerobic Digestion Process - CH 4 Methane: value adding component of the biogas Transfer of the value to higher-level master control Folie 40
41 The Anaerobic Digestion Process - Methanogenesis Acetoclastic methanogenesis Acetate CH 3 COO - + H 2 O CH 4 + HCO - 3 Hydrogenotropic methanogenesis Hydrogen HCO H H 2 CH H 2 O Folie 41
42 The Anaerobic Digestion Process - H 2 (2) Acidification processes Shifts in the balance of methane formers acid formers Folie 42
43 The Anaerobic Digestion Process Disintegration Degradable, particulate organic matter Carbohydrates, lipids, proteins Inerts Hydrolysis Acidogenesis Acetogenesis Methanogenesis Monosaccharides, disaccharides, amino acids, SC peptides, LC fatty acids, glycerine Volatile fatty acids (acetate, propionate, butyrate), aldehydes, alcohols, ketones, hydrogen sulfide, ammonia, carbon dioxide, hydrogen Acetate, carbon dioxide, hydrogen H 2 H 2 S NH CO 2 H 2 3 CO 2 CO 2 CO 2 H 2 H 2 CO CO 2 2 H CO CO CO CH 2 4 CH Methane, carbon dioxide CH CO CH 4 H 2 Folie 43
44 The Anaerobic Digestion Process Disintegration Degradable, particulate organic matter Carbohydrates, lipids, proteins Inerts Hydrolysis Acidogenesis Acetogenesis Methanogenesis Monosaccharides, disaccharides, amino acids, SC peptides, LC fatty acids, glycerine Volatile fatty acids (acetate, propionate, butyrate), aldehydes, alcohols, ketones, hydrogen sulfide, ammonia, carbon dioxide, hydrogen Acetate, carbon dioxide, hydrogen O 2 N 2 N 2 H 2 H 2 S NH CO 2 H 2 3 CO 2 CO 2 CO 2 H 2 H 2 CO CO 2 2 H CO CO CO CH 2 4 CH Methane, carbon dioxide CH CO CH 4 O 2 H 2 N 2 Folie 44
45 The Anaerobic Digestion Process - O 2 Digester and substrate surface: H 2 S + O 2 2 H 2 O + S With gas analysis system: Control of desulfurisation (Fuzzy Logic) No manual aeration No overdosage Dilution of the biogas No underdosage Too high H 2 S-content Corrosion damages Aeration permanently controlled according to actual measurements of H 2 S und O 2 Folie 45
46 The Anaerobic Digestion Process - O 2 Check of the anaerobic process, tightness Check/correction in research applications Folie 46
47 Composition of biogas Component Symbol Range Unit Methane CH % Carbon dioxide CO % Water vapour H 2 O 0-7 % Nitrogen N % Oxygen O % Hydrogen sulfide H 2 S ppm Hydrogen H ppm Ammonia NH ppm O 2 N 2 N 2 H 2 O 2 H 2 S NH CO 2 H 2 3 CO 2 CO 2 CO 2 H 2 H 2 O CO H 2 CO 2 2 H CO CO H 2 N 2 CO CH 2 4 CH CH CO CH 4 Folie 47
48 Applications (1) Biological Control Desulfurisation Laboratory and research facilities Gas utilisation in motors Gas supply and gas sales Fuel cells CDM-applications Folie 48
49 Applications (2) Gas flow, normalised gas and energy calculations, autom. calibration Cont. measuring, data logging, limit monitoring, master control Folie 49
50 Applications (3) Gas flow, normalised gas and energy calculations, autom. calibration Cont. measuring, data logging, limit monitoring, master control Folie 50
51 Gas Analysis and Plant Control I Visualisation air CHP fermenter Folie 51
52 Gas Analysis and Plant Control II Alerts State detection Plant control Folie 52
53 Fuzzy Logic: Basics What is Fuzzy logic? unsharp, blurred, indistinct hazy logic Based on the fuzzy set theory Degree of membership B 1 B A A A: tall men ( 1,80 m) B: small men (< 1,80 m) 0 1,53 A: tall men B: small men 1,98 Height (m) Folie 53
54 Fuzzy Logic: Basics II Why Fuzzy logic + No math. Description of an issue or problem is necessary + Verbal description of the process understanding ( expert system ) + Systems can be controlled / regulated, even when a direct mathematical correlation can not be shown + Comparatively easy to understand + Robust even with gaps or outdated knowledge base + Fast calculation in real time possible + Low data requirements => Used for control and automation tasks: medical care, finance, consumer electronics, automotive engineering, voice / document recognition, biotechnological processes,... Folie 54
55 Fuzzy Logic: Fuzzyfication (Example: ph-value) Folie 55
56 Fuzzy Logic: Structure of a Fuzzy System Input variables R1 System states R2 Global measures/ strategies R3 Output variables,, ph-value: 6,3,, Fuzzification Rule base 1: IF c1_ph IS very_low THEN c1_state IS toxic; IF c1_ph IS low THEN c1_state IS overload; Rule base 3: IF c1_state IS overload THEN feed IS no_feed; IF c1_state IS shortage THEN feed IS more; Defuzzification, feed: 0,72, Folie 56
57 Fuzzy Logic: Defuzzification (Change of Feed Rate) COG: 0,72 Folie 57
58 Fuzzy Logic: Gas Analysis (Fuzzyfication H 2 ) Folie 58
59 Fuzzy Logic: Gas Analysis Within The Control System Rule bases: Fuzzification IF c1_ch4 IS high AND c1_h2 IS low THEN c1_state IS shortage; IF c1_h2 IS high THEN c1_state IS overload; IF d_c1_ch4 IS decreasing AND d_c1_h2 IS increasing THEN c1_state IS overload; IF H2S IS high THEN W_set IS high; Methane: ch4 Input variables Hydrogen: h2 Change of methane content: Δch4 Change of hydrogen content: Δh2 Hydrogen sulfide: h2s Oxygen: o2 Output variables:, CHP power, Feed rate, Aeration desulfurisation, Defuzzification Folie 59
60 Summary AWITE Bioenergie GmbH company presentation Gas analysis systems technology (AWITE AwiFLEX Cool+ and AwiECO) System implementation The anaerobic digestion process: gas formation, monitoring and control options with the implementation of a gas analysis system H 2 S: poison gas, corrosion, biological desulfurisation, monitoring of limit values CO 2 : acidification, check value against methane measurement H 2 : acidification, microbiol. balance => targeted process control & feeding, avoidance of failures & economical losses CH 4 : process end product, value adding component, value for master control, monitoring of limit values O 2 : desulfurisation, tightness of the system Gas flow: process monitoring Further gas analysis applications, fuzzy logic plant control Folie 60
61 Thank you very much for your attention! Awite Bioenergie GmbH Grünseiboldsdorfer Weg Langenbach/Niederhummel Folie 61
62 AWITE Distribution Partner UK Allison Engineering Capricorn Centre Cranes Farm Road Basildon Essex SS14 3JA Tel: Fax: Folie 62
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