Biogas Storage System Manufacturer

Project Overview

In large-scale biogas projects, including livestock waste treatment, agricultural waste management, food-processing wastewater treatment, and industrial organic waste treatment, biogas production can fluctuate depending on feedstock supply, anaerobic digestion conditions, and operating parameters.

To balance fluctuations between biogas production and downstream gas consumption, a safe, stable, and flexible gas storage system is an essential part of a modern biogas plant.

In this project, a Double Membrane Gas Holder was selected as the primary gas storage and pressure-buffering system. The gas holder was integrated with the anaerobic digester, biogas desulfurization system, gas-water separation equipment, gas pipelines, and downstream biogas utilization equipment to provide reliable biogas collection, temporary storage, and stable gas supply.

The double membrane gas holder adopts a flexible membrane structure. Compared with conventional rigid gas storage tanks, it offers advantages such as lower structural weight, flexible site adaptation, convenient transportation, efficient on-site installation, and customizable gas storage capacity. These characteristics make it particularly suitable for medium- and large-scale biogas projects.

Application Scenarios

Double membrane gas holders are widely used in projects that require centralized biogas storage and gas volume regulation, including:

• Large-scale livestock and poultry biogas plants

• Agricultural waste anaerobic digestion projects

• Food-processing and organic wastewater treatment projects

• Municipal wastewater treatment plants

• Landfill gas collection and utilization projects

• Industrial organic waste treatment projects

• Biogas power generation and CHP projects

• Biomethane production and upgrading projects

In actual operation, biogas production from anaerobic digesters is rarely completely constant. At the same time, downstream equipment such as gas engines, boilers, CHP units, and biogas upgrading systems may have different gas consumption requirements.

The double membrane gas holder provides an effective buffer between gas production and gas utilization, helping maintain a more stable gas supply for downstream equipment.

Gas Storage Capacity Design

The storage capacity of a double membrane gas holder is normally designed according to the project's daily biogas production, peak gas flow, downstream gas consumption, required storage duration, and operating conditions.

Depending on the project scale, gas storage capacity can range from several dozen cubic meters to several thousand cubic meters or more.

For large-scale biogas plants, high-capacity double membrane gas holders can be designed to accommodate continuous gas production and centralized gas utilization.

During the engineering design stage, several key parameters are considered, including:

Designed Gas Storage Capacity: Customized according to project requirements.

Effective Gas Storage Volume: Calculated according to biogas production and downstream gas consumption.

Operating Pressure: Determined according to downstream equipment and pipeline requirements.

Membrane Specification: Selected according to gas composition, local climate, and project operating conditions.

Diameter and Height: Designed according to storage capacity, available installation space, and foundation conditions.

This customized approach allows the double membrane gas holder to adapt to different project scales and operating requirements rather than relying on fixed standard storage capacities.

Function of the Inner Membrane

The inner membrane is the core component responsible for storing biogas.

When biogas enters the gas holder, the inner membrane expands upward under gas pressure, creating the actual gas storage space. As more biogas enters the gas holder, the storage volume increases. When downstream equipment consumes biogas, the inner membrane gradually moves downward.

The inner membrane therefore performs three primary functions:

1. Biogas Storage

The inner membrane creates an enclosed storage space for temporarily storing biogas generated by the anaerobic digestion system.

2. Gas Volume Regulation

It provides a buffer between fluctuations in biogas production and changes in downstream gas consumption, helping maintain a stable gas supply.

3. Pressure Regulation

The movement of the membrane, together with the pressure control system, helps maintain suitable gas pressure for downstream equipment such as desulfurization units, gas engines, boilers, and biogas upgrading systems.

Function of the Outer Membrane

The outer membrane primarily provides structural support and environmental protection for the gas holder.

A blower system maintains the pressure between the inner and outer membranes, allowing the outer membrane to maintain a stable three-dimensional structure while providing sufficient space for the inner gas storage membrane.

The main functions of the outer membrane include:

• Providing structural support for the inner membrane

• Protecting the inner membrane from wind, rain, UV radiation, and other environmental factors

• Maintaining the overall structural stability of the gas holder

• Maintaining the designed external shape of the gas holder

• Improving the system's adaptability to outdoor operating environments

The double membrane structure separates gas storage and external structural support into two functional layers, providing a practical combination of storage performance, structural stability, and environmental protection.

Service Life and Membrane Performance

Double membrane gas holders are manufactured using specialized membrane materials with good weather resistance, corrosion resistance, flexibility, and tensile strength.

The specific membrane material, thickness, and structure are selected according to factors such as gas composition, local climate, UV exposure, operating conditions, and project design requirements.

Under proper design, manufacturing, installation, and maintenance conditions, a double membrane gas holder can provide a long service life.

Actual service life depends on several factors, including membrane quality, UV exposure, wind and snow conditions, temperature fluctuations, operating pressure, maintenance practices, and installation quality.

For this reason, project owners should evaluate not only the initial equipment cost but also membrane performance, welding quality, structural design, wind-load resistance, safety systems, and the manufacturer's engineering experience.

Convenient Transportation for International Projects

One of the major advantages of a double membrane gas holder is its convenient transportation.

Unlike conventional large rigid gas storage tanks, the flexible membrane structure can be manufactured, cut, welded, inspected, folded, and packaged at the factory before shipment.

The membrane components can then be transported by container or other suitable international transportation methods.

This significantly reduces the transportation challenges associated with oversized rigid tanks and lowers the requirements for heavy-duty transportation and large-scale lifting equipment.

This feature is particularly valuable for international biogas projects.

After the equipment arrives at the project site, the membrane components can be unpacked, positioned, fixed, and assembled according to the engineering design.

The combination of factory modular manufacturing and on-site assembly makes double membrane gas holders an efficient solution for overseas biogas projects.

Efficient Installation and System Integration

Double membrane gas holders are normally designed as modular systems.

On-site installation typically includes foundation inspection, membrane installation, anchoring system installation, blower connection, gas pipeline connection, pressure control system installation, and safety accessory installation.

After installation, the gas holder can be connected to biogas pipelines, desulfurization equipment, gas-water separators, flame arresters, biogas flares, gas engines, boilers, or biogas upgrading systems.

With proper engineering design, the double membrane gas holder can function as an important gas storage unit within a complete biogas treatment system, connecting the process from:

Anaerobic Digestion → Biogas Collection → Gas Storage → Desulfurization → Gas Treatment → Safe Flaring → Power Generation or Biomethane Upgrading

This integrated configuration improves the overall flexibility and operational stability of the biogas plant.

Project Value

The application of a double membrane gas holder provides significant advantages in gas storage, gas volume regulation, transportation, installation, and system integration.

Compared with conventional rigid gas storage equipment, the double membrane gas holder offers flexible structural design, customizable storage capacity, convenient transportation, efficient installation, and strong adaptability to large-scale biogas projects.

For long-term biogas projects, an appropriately designed gas storage system can effectively balance fluctuations between biogas production and consumption while improving the stability of downstream gas utilization equipment.

As the global demand for agricultural waste treatment, wastewater management, renewable energy, and biomass resource recovery continues to grow, double membrane gas holders are becoming an important gas storage solution for modern biogas plants.

As a professional biogas equipment manufacturer, we provide customized double membrane gas holder solutions based on biogas production, required storage capacity, site conditions, gas composition, operating pressure, and downstream utilization requirements.

Our solutions can also be integrated with biogas desulfurization systems, gas pipelines, biogas flares, and gas utilization equipment to provide customers with a complete and reliable biogas engineering solution.