Source:JASE-W Japanese Smart Energy Products & Technologies

https://www.jase-w.eccj.or.jp/technologies/index.html

E-53

Keywords

Y4

system or software

Z3

natural gas

F34

Production & distribution of gas
Osaka Gas Co., Ltd.

Technology for improving biogas value
Features
Equipment for manufacturing high purity methane, by purifying biogas generated or manufactured fromorganic waste materials is recommended.
u Resources disposed of in the past, such as waste liquid from palm oil extraction or cassava processing,as well as sewage and raw waste, can be used effectively.
u Purified methane (biomethane) can be used as a natural gas substitute fuel and used as automobile fuel,as well as industrial fuel. Since they are derived from waste materials, greenhouse gas emissions can bereduced when compared to ordinary natural gas.
Basic Concept or Summaryu Summary
Biogas is renewable energy derived from a biological fermentation process of organic waste materials andraw waste, such as sewage sludge or agricultural residue, which is considered carbon neutral. They areused primarily as fuel for boilers and gas engines that require no purification, however a trend of purifying
biogas to produce a natural gas substitute fuel (fuel for utility gas and natural gas vehicles (NGV)) has been
spreading in the recent years, driven by the perspective for reducing the environmental burden. Osaka Gas
offers biogas purification equipment that adopts proprietary technology for manufacturing biomethane, byremoving carbon dioxide (CO2) from biogas (60% CH4 and 40% CO2).

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Biogas purification and utilization flowu Principle
This equipment adopts the hybrid biogas purification system, a proprietary technology of Osaka Gas.
The following two technologies are combined to achieve a high methane recovery rate of 99%.
• The “PSA” (Pressure Swing Absorption) is an absorbent (Daigas Group product) that selectively
absorbs CO2, removing CO2 from biogas to extract methane gas.
• The “gas separation membrane” recovers methane from the exhaust gas that is primarily composed ofCO2 extracted by the PSA.

Biogas is purified through the flow described below, to manufacture biomethane.
• Biogas is separated by the PSA into biomethane gas and CO2 rich off-gas.
• The off-gas that contains CH4 is separated by the separation membrane into the CH4 rich recycled
gas and CO2 rich permeable membrane gas.
• The CO2 rich permeable membrane gas is expelled outside the system.
• The CH4 rich recycled gas is redirected to the PSA. A CH4 recovery rate of 99% is achieved
through this recycling system.

u Facility specifications• Biogas treatment quantity
300 to 2,000 Nm3/h• Biogas receiving conditions (negotiable)
CH4 concentration: 50 to 60 vol%Hydrogen Sulfide：≦ 200 ppm
Moisture content: Saturation at normal
temperature or lower• Product biomethane specification
CH4 concentration: 87 to 98 vol%• Intended countries and regions
Southeast Asia and Japan

Effects or Remarks
5 million Nm3 of biomethane gas is manufactured annually with the condition that the biogas is treated at
the rate of 1,000 Nm3/h. Using this as a natural gas alternative fuel contributes to a CO2 reduction of10,000 tons annually.

Installation in Practice or Schedule
Domestic

Purification and fuel use of raw waste derived biogas: 1 unit

Overseas

Manufacturing of fuel for natural gas vehicles (NGV) at Agriculture of Basin Company Limitedin Thailand: 1 unit

Contact:

Osaka Gas Co., Ltd.
Carbon Neutral Gas Development Team, LNG & Engineering Department, LNG,
Power & Engineering Business Unit
Tel: +81-(0)6-6205-4589 Fax: +81-(0)6-6444-1062
URL: http://www.daigasgroup.com/E-53