GB/T 51063-2014 English PDF (GBT51063-2014)

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GB/T 51063-2014: Technical code for large and medium-scale biogas engineering
GB/T 51063-2014
UDC GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
P GB/T 51063-2014
Technical code for large and medium-scale biogas
engineering
ISSUED ON: DECEMBER 02, 2014
IMPLEMENTED ON: AUGUST 01, 2015
Issued by: Ministry of Housing and Urban-Rural Development of PRC;
General Administration of Quality Supervision, Inspection and
Quarantine of PRC.
Table of Contents
Foreword ... 6
1 General provisions ... 8
2 Terms and abbreviations ... 9
2.1 Terms ... 9
2.2 Abbreviations ... 10
3 Basic requirements ... 12
4 Biogas station ... 14
4.1 Site selection and general layout ... 14
4.2 Raw materials and pretreatment ... 17
4.3 Anaerobic digestion process and equipments ... 19
4.4 Biogas purification ... 24
4.5 Biogas storage ... 26
4.6 Pipeline accessories, pumps, boosters and metering devices ... 28
4.7 Fire-fighting facilities, water supply and drainage system ... 32
4.8 Electrical device and safety system ... 33
4.9 Heating and ventilation ... 35
5 Transportation and applications of biogas ... 37
6 Construction installation and acceptance ... 39
6.1 General requirements ... 39
6.2 Structure and foundation construction ... 39
6.3 Installation of steel anaerobic digester ... 40
6.4 Biogas purification and installation of storage facilities ... 44
6.5 Pipeline construction ... 45
6.6 Mechanical equipment and electrical instrumentation installation ... 46
6.7 Commissioning ... 48
6.8 Completion and acceptance ... 49
7 Operation and maintenance ... 51
7.1 General requirements ... 51
7.2 Plant facilities ... 51
7.3 Pipes and accessories ... 55
Appendix A The calculations and design of preprocessing pool design ... 57
Appendix B The maximum volume of the double membrane gas cabinet and the
maximum pressure ... 62
Appendix C The horizontal and vertical spacing between buried gas pipelines and
buildings, structures or adjacent pipelines ... 63
Appendix D Explosion hazardous area classification and delineating ... 65
Appendix E Biogas routine laboratory tests and the cycle of inspection ... 68
Explanation of wording in this Code ... 70
List of quoted standards ... 71
Technical code for large and medium-scale biogas
engineering
1 General provisions
1.0.1 In order to standardize the design, construction, installation, acceptance, operation,
maintenance of large and medium-scale biogas engineering, AND to ensure project
quality and safe production, this Code is hereby formulated.
1.0.2 This Code applies to the design, construction and installation, acceptance,
operation and maintenance of the newly-built, expanded, rebuilt biogas engineering,
which uses anaerobic digestion technology to process the agricultural organic waste,
industrial high-concentration organic wastewater, industrial organic waste residue,
sludge, is mainly for gas supply, has a biogas output of not less than 500 m3/d.
1.0.3 Large and medium-sized biogas projects shall actively adopt new technologies,
new processes, new materials, new equipment, on the basis of constantly summarizing
practical experience in production and construction, so as to achieve stable operation,
reliable equipment, advanced technology, economic feasibility.
1.0.4 The design, installation, acceptance, operation and maintenance of large and
medium-sized biogas projects shall not only comply with this Code, but also comply
with the current relevant national standards.
2 Terms and abbreviations
2.1 Terms
2.1.1 Biogas
A combustible mixed gas, which is mainly composed of methane, has a low-level
calorific value not less than 17 MJ/m3 as produced by the digestion of organic matter,
under anaerobic conditions, by microorganisms.
2.1.2 Biogas station
A place which uses anaerobic digestion technology to produce, purity, store biogas.
2.1.3 Large and medium-scale biogas engineering
A biogas project, which adopts the anaerobic digestion process to process agricultural
organic waste, industrial high-concentration organic wastewater, industrial organic
waste residue, sludge, has the biogas output of not less than 500 m3/d; can be used for
civil, power generation, purification and compression. It includes biogas stations,
transmission and distribution pipeline network, user engineering, referred to as "biogas
engineering".
2.1.4 Agricultural organic waste
Organic substances, such as crop straws, which are produced in the process of
agricultural production AND livestock and poultry manure produced in the whole
process of aquaculture production.
2.1.5 High concentration industrial organic wastewater
Liquid organic waste, which has a CODcr content greater than 2000 mg/L, is discharged
from industrial production, such as brewing, papermaking, food processing.
2.1.6 Industrial organic residue
Solid organic waste, which is discharged from industrial production, such as brewing,
sugar refining, starch processing, biopharmaceuticals, paper making, food processing.
2.1.7 Sludge
The sludge, which is produced in primary settling tanks and secondary settling tanks,
in the process of urban sewage treatment. It does not include: screen slag, scum, sand
settling in grit chambers.
2.1.8 Volume organic loading rate
The amount of organic matter, that can be digested per unit volume of anaerobic
digester per day, expressed in kgCODcr/(m3·d).
2.1.9 Cryochem
A method to condense and precipitate saturated water in biogas, by lowering the
temperature.
2.1.10 Bio-desulfurization
A method for removing hydrogen sulfide in biogas, under microaerobic conditions after
the desulfurization bacteria group is cultivated.
2.1.11 Space velocity
The capacity of a unit volume of desulfurizer to treat biogas per hour.
2.1.12 Sulfur sludge
The mixture containing elemental sulfur, sulfite, sulfate and biological metabolites,
which is produced in the process of biological desulfurization.
2.1.13 Anaerobic activated sludge
Suspended matter and colloidal matter, which are formed by the combination of
anaerobic digestion bacteria and flocs and particles, with a strong ability to adsorb and
decompose organic matter; it can also be used as the inoculum for the initial raw
materials of anaerobic digesters.
2.2 Abbreviations
CSTR - Complete stirred tank reactor
USR - Upflow solid reactor
UASB - Upflow anaerobic sludge blanket reactor
IC - Internal circulation anaerobic reactor
EGSB - Expanded granular sludge blanket reactor
HCPF - High concentrations of plug-flow reactor
TS - Total solids
SS - Suspended solids
VS - Volatile solids
4 Biogas station
4.1 Site selection and general layout
4.1.1 The site selection shall conform to the overall planning of urban and rural
construction. It shall meet the following requirements:
1 It should be on the downwind side of the dominant wind direction in the residential
area throughout the year; it shall be far away from the residential area; it shall meet
the requirements of sanitation and epidemic prevention;
2 It should be close to the production area of biogas fermentation raw materials. For
civil biogas projects, a reasonable site shall be selected, according to the
distribution characteristics of gas consumption areas. Biogas projects for power
generation and grid connection shall be close to transmission and power lines;
3 It should choose the natural foundation with solid rock and soil and good anti-
seepage performance; it shall avoid unfavora...