Clean Fuels & Biogas

Mercury (Hg)

GLP can provide complete solutions for mercury removal (whether organic or inorganic mercury) from liquid or gas phase streams.

For the application of natural gas purification, the mercury content of the gas may be reduced to less than 0.1 ppbv (1 microgram/Nm3).

We offer a range of activated carbon-based and mixed metal oxide-based adsorbents that fit many operations depending on feedstock composition, process conditions, and desired changeout frequency. The optimal performance balance - based on adsorption efficiency, pressure drop, durability, and adsorbent life - is ensured by the appropriate choice of carbon based or mixed-metal extrudates, tablets or granules.

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Oxides of Nitrogen (NO_x) Abatement

GLP provides complete solutions for oxides of nitrogen (NO/NO₂) removal from gas or liquid streams, a common emissions control requirement in many plants.

Depending on the process conditions and desired NOx removal efficiency, GLP can select the appropriate technology for your application.

Options may include:

• Selective Catalytic Reduction (SCR) technology for maximum NOX removal performance or high gas flow applications.
• Wet scrubbing technology to produce a Nitric Acid (HNO₃) product stream
• GLP offers complete turnkey equipment packages customised to your plant requirements.
  
  

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Nitrous Oxide (N₂O) Abatement

GLP provides complete solutions for nitrous oxide (N₂O) removal from gas streams, a common emissions control requirement in Nitric Acid plants.

Solutions generally involve a catalyst providing selective catalytic reduction of the contaminant gas. Catalysts can be operated at temperature between 300°C and 900°C depending on the application. Greater than 99.9% removal is possible under the correct operating conditions.

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Hydrogen Sulfide (H₂S)

Removal of acidic hydrogen sulphide (H₂S) gas is a common contaminant in natural gas or CO₂ processing applications, and particularly for biogas.

GLP has designed and installed many different H₂S removal systems tailored to each customer’s requirements.

H₂S is typically removed with the following technologies:

• Wet scrubbing with water or alkaline solutions
• Dry chemisorption with mixed metal oxides

GLP works with customers to specify the most suitable process technology for each requirement including desired H₂S removal efficiency, economics, available utilities and waste disposal considerations.

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Oxides of Sulphur (SO_X)

Removal of acidic sulphur oxides (SO_x) is typically achieved using packed bed scrubbing technology, and if particulates or other contaminants are present, a venturi scrubbing device will often also be specified. Scrubbing liquids are typically alkaline solutions. Catalytic oxidation of SO₂ to SO₃ is also possible, and production of a sulphuric acid (H₂SO₄) product is a possible solution in some circumstances.

GLP works with customers to specify the most suitable process technology for each requirement including desired SO_x removal efficiency and available utilities.

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Volatile Organic Compounds (VOCs) Abatement

Industrial exhaust gas typically contains a variety of organic compounds, such as chemical by-products, solvents or malodorous compounds. These volatile organic compounds (VOCs) and hydrocarbons (HC), including carbon monoxide (CO) are emitted by many industrial processes and need to be eliminated. Some applications also require a decomposition of nitrogen compounds such as NO_x, N₂O and NH₃.

Catalytic incineration is a proven, best practice choice for many plants because the oxidation reactions take place at a much lower temperature than with thermal oxidation. Lower operating temperatures translate to less stress on equipment and reduced operating costs, which can provide significant economic benefit.

GLP provides a full range of standard and customized catalysts in both spherical and honeycomb forms, with precious metals or base metals as active components. Our flexibility in manufacturing allows us to customise the catalyst according to the specific demands of each application and equipment design.

GLP offers complete turnkey equipment packages customised to your plant requirements.

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Hydrogen Chloride (HCl) / Chlorine (Cl₂) Scrubbing

Chlorine gas (Cl₂) or hydrogen chloride (HCl) is scrubbed using an ejector venturi gas scrubber or counter current packed tower. A venturi gas scrubber is an “eductor”-type design. It makes use of the scrubbing liquid as the motive fluid to pull the gas stream into and through it without the need of another device, such as a fan, to move the gas. The liquid and gas streams thoroughly mix, and the HCl transfers from the gas phase to the scrubbing liquid phase.

A single-stage ejector venturi gas scrubber can typically achieve 95 percent contaminant removal. A countercurrent packed tower is used to achieve even highercontaminant removal efficiencies, up to and exceeding 99.9 percent. This device is a vertical tower in which the scrubbing liquid flows downward countercurrent to the upward gas flow over a bed of packing pieces that function primarily to provide a surface area on which the two streams come into contact.

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Carbon Monoxide (CO) Abatement

Carbon monoxide (CO) is emitted by many industrial processes and need to be eliminated to meet emissions regulations.

Catalytic incineration is a proven, best practice choice for many plants because the oxidation reactions take place at a much lower temperature than with thermal oxidation. Lower operating temperatures translate to less stress on equipment and reduced operating costs, which can provide significant economic benefit.

GLP provides a full range of standard and customized catalysts in both spherical and honeycomb forms, with precious metals or base metals as active components. Our flexibility in manufacturing allows us to customise the catalyst according to the specific demands of each application and equipment design.

GLP offers complete turnkey equipment packages customised to your plant requirements.

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Ammonia (NH₃)

Ammonia (NH₃) is commonly present as a contaminant in various biogas streams or in industries producing or using ammonia.

Ammonia is highly water soluble and can be absorbed into an aqueous solution of ammonia, or chemically neutralised using an acidic agent.

GLP has designed many ammonia removal scrubbers typically processing ammonia-rich off-gas, and recovering the ammonia into an aqueous solution. Ammonia solutions can be used to scrub acid gases such as carbon dioxide from other waste gas streams.

GLP is able to work with our client to provide a holistic design to meet all the process requirements and emission limits utilising how extensive scrubbing technology know how.

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Cyanide (CN) Scrubbing

Hydrogen cyanide (HCN) is usually scrubbed with an aqueous solution of NaOH. The methods used are similar to those described for HCl scrubbing. Recovery as a usable by-product is not practical. Also, in some cases, the addition of Sodium Hypochlorite (NaOCl) to the scrubbing solution is used to increase removal performance or to produce more desirable reaction products.

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Particulate Matter (PM)

GLP can provide solutions for removal of particulate matter from gas and liquid streams for particulate sizing as small as 0.3 micron. Typically, wet scrubbing using venturi technology is utilised in order to provide high particulate scrubbing efficiency while also allowing scrubbing of other fumes or gaseous contaminants as required.

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