Modular Plant Technology Tailored to Individual Circumstances and Performance Requirements

HZI BioMethan delivers gas upgrading facilities that can also be built as an expansion of existing plants. They treat and upgrade biogenic gases such as biogas, sewage and landfill gas, as well as flue gases. Depending on their infrastructure, operators can choose between a physical and chemical process. We also offer optional technologies to enable the upgraded gases to be processed further.

Biogas Upgrading l  Carbon Capture  l  Add-ons



Biogas Upgrading

Amine Scrubbing

Heat-driven process for separating carbon dioxide

HZI delivers first-class gas upgrading systems based on pressureless chemical amine scrubbing, a particularly efficient and reliable heat-driven process. High-quality scrubbing fluid ensures process stability and plant efficiency, resulting in exceptionally high system performance and availability.

Characteristics of amine scrubbing:

  • Operates with any waste heat source
  • Methane purity of up to 99.5% vol
  • Minimal methane slip (max. 0.1% vol)
  • High product gas purity means the gas can be injected into any natural gas grid
  • Robust plant design for greater biogas quantity

Membrane Technology

Pressure-driven process for separating carbon dioxide

To enable our customers to choose the process that best suits their needs, we also offer membrane technology – a pressure-driven process for upgrading biogas – in addition to amine scrubbing. Here the carbon dioxide is separated using membranes made from high-performance polyamides, specially designed by Evonik for upgrading facilities, and offering high permeability and selectivity. Membrantechnik

Characteristics of membrane technology:

  • Optimized treatment system thanks to individualized membrane concepts
  • Methane purity of up to 98 % thanks to above-average CO2 and methane selectivity
  • Methane slip reduced to below 0.5 % vol thanks to the three-stage design of the membrane modules
  • Plant control system easily adjustable if volume flows and gas composition change


Carbon Capture

Separating CO2 from Flue Gases Using Heat-Driven Amine Scrubbing

In the process of industrial incineration, the pressureless amine scrubbing process can also be used to separate the CO2 from flue gases by using the waste heat produced in upstream incineration to efficiently regenerate the scrubbing solution. These systems also boast high availability and performance, and minimize the amount of CO2 remaining in the flue gases. This not only improves a company’s climate footprint, the high-purity carbon dioxide can also be used as a product gas for certain applications.

Characteristics of carbon capture:

  • Efficient use of waste heat
  • Sensible process coupling
  • Maximum 1.0 % CO2 content in flue gas
  • Produces carbon dioxide for use in different industrial processes




Injection Technology (+Grid)

Biomethane injection into any natural gas infrastructure

With our +Grid add-on, we have developed injection systems that can reliably address the requirements of network operators. The gases upgraded for injection into the natural gas grid are measured to determine the quantity and quality and compressed to the corresponding pressure. The gas quality is adjusted precisely to the network level using liquid gas or air, and odorized depending on the pressure stage. Operators also profit from our extensive expertise in interfacing to upstream processes.

Characteristics of +Grid:

  • Quantity and quality measurement technology installed in line with the network operator’s requirements
  • Range of compression technologies providing optimal energy and maintenance solutions
  • Gas quality regulated precisely by conditioning with liquid gas or air
  • Redundant systems integrated to ensure the highest possible availability of the plant technology


Filling Station Technology (+CNG)

BioCNG filling stations with a flexible installation concept

Our +CNG technology is a filling station concept for fueling natural gas-driven vehicles, and is designed for enterprises producing their own biogas or gas from sewage or landfill. Following upgrading using Membrane Technology or Amine Scrubbing, the gas is compressed to up to 300 bar, the storage pressure of a filling station, and temporarily stored. Once the gas has been odorized, vehicles can be filled up via an autofuel terminal with an integrated volume measurement system. The storage capacity is set in line with the requirements of the vehicles to be served.

Characteristics of +CNG:

  • Methane purity of up to 98% maximizes the range per tank
  • Flexible assembly thanks to modular container-based construction
  • Upgrading pressure used to minimize energy expended on achieving storage pressure


CO2 Liquefaction (+CO2)

CO2 liquefaction for variable use of product gas

Fertilizer, fire extinguishers, dry ice, disco fog – there’s no end to the potential uses of carbon dioxide. In liquid form, it can be transported more effectively, stored, and put to use. In addition to carbon capture and biogas upgrading, we also offer +CO2, a range of liquefaction solutions. Secondary gas substances are removed, and the gas is liquefied using low-temperature cooling to make it transportable, storable, and ready for use.

Characteristics of +CO2:

  • High-purity CO2 as required by the user
  • Energy used for liquefaction is minimized