| Features | |
| Volume Capacity: | From 10 to 5000 m3 with pressures ranging from 20 – 50mbar depending on the size. |
| Raw materials: | Are carefully selected and tested in-house before being used in order to warrant the product for a long working life without problems. |
| Half sphere shape: | Provides for constant and repeatable movements of the gas bag and consistency of level transmitters for control. |
| Civil requirements: | Simple flat concrete bases with cast-in anchor brackets. Above ground gas inlet / outlet pipework can be facilitated. |
| Easy to operate: | The gasholder is fully automated and requires minimal visual maintenance. |
| Cost: | The capital cost to provide and install a membrane gasholder provides a considerable saving over conventional designs. |
Membrane Gas Holders
Ecomembrane S.r.l (Italy) have been developing the application of plastic membranes for use in various industries for more than 20 years.
Large production facilities equipped with ‘state of the art’ automatic machinery now manufacture membrane products, which have been specifically developed to provide cost effective and environmentally friendly solutions for biogas collection and utilisation.
Membrane biogas holders have been available since the 1980’s being used widely in Europe. The membrane biogas holder offers the designer and end user a very flexible and economical alternative to a steel roof/bell structure. Why?
- The capital cost outlay is substantially reduced
- No need for expensive concrete structures or steel fabrications
- Can be fitted to any size or shape of tank as a gas holder dome
- Procurement and build times substantially reduced
- Reference plants up to 16000m3 (Ankara, Turkey)
- Steel Corrosion due to H2S is not an issue
Biogas Products Ltd are able to offer two designs of membrane biogas holders i.e. the more commonly known 2 membrane standard system and the higher specification 3 membrane system. The design common to both systems is:-
- The half sphere shape of the membrane biogas holder which provides for a constant measureable; and repeatable deflation of the inner biogas chamber.
A ‘patented’ accurate biogas chamber level sensor and support mechanism that allows the full capacity of the biogas chamber to be used and reliably controls auxiliary equipment.
- Simple flat concrete bases required for installation of the membrane biogas holder
- Above ground connections for the biogas inlet / outlet pipework
- H2S resistant membrane materials
- Welding procedures that allow system pressures up to 50mbar
The 3 membrane system offers enhanced safety and environmental benefits:-
- Safety - The system completely divides the biogas from the air avoiding any potential explosive atmospheres and sealing of the biogas membrane to the concrete base is not required.
- Power failure - The system design enables the outer air membrane to remain inflated at all times avoiding possible collapse onto surrounding equipment.
- Low energy usage – The air blower only runs when gas is being discharged from the biogas holder requiring a fractional kW motor to maintain pressure.
Main features
 |
1 |
Air Chamber |
2 |
Biogas Chamber |
|
3 |
Air Blower Unit |
|
4 |
Ait Inlet |
|
5 |
Anchoring System |
|
6 |
Level Sensor (4-20mA) |
|
7 |
Pressure Regulating Valve |
|
8 |
Condensate Drain |
|
9 |
Gas Inlet/Outlet Pipe |
|
10 |
Gas Safety Relief Valve |
Gas Holder sizes
| m³ | a | b |
|---|---|---|
| 10 | 3,40 | 2,20 |
| 50 | 5,80 | 3,40 |
| 100 | 7,30 | 4,20 |
| 300 | 10,50 | 5,80 |
| 500 | 12,50 | 6,80 |
| 800 | 14,60 | 7,80 |
| 1000 | 16,00 | 8,40 |
| 2000 | 20,00 | 10,40 |
| 3000 | 22,90 | 11,80 |
| 4000 | 25,20 | 13,00 |
| 5000 | 27,10 | 13,90 |