Flue gas cleaning & flue gas treatment

Objective

Thermal treatment processes generate flue gases with different composition but always more or less harmful to the environment. Our flue gas cleaning systems are purpose-designed to treat the gas such that emission limits are well met with acceptable margins also during fluctuations in the gas composition. Typical components in this respect are dioxin, hydrochloric acid (HCl), sulphuric acid (SO₂), hydrofluoric acid (HF), ammonia (NH₃), mercury and often also other heavy metals and dust. Our flue gas cleaning technology is predominantly applied in the areas of incineration of hazardous waste, municipal waste (from households), industrial waste and sludge. Also the metal and chemical industries with similar needs for flue gas treatment are our clients.

Client benefits

Our technology offers advantages as follows:

Most efficient flue gas treatment suitable to handle large variations in gas composition
Very high availability
Minimal residue product and deposition cost
Low maintenance cost
Possible integration of energy recovery and thereby faster return of investment.

General concept of flue gas cleaning and flue gas treatment

Multifunctional compact solutions are offered where the different components can be captured within a single wet scrubber. Energy recovery can be integrated, if needed. The unit can also be combined with a static dioxin absorber operating at saturation point or at a slightly overheated atmosphere.

Products

More than 40 incineration lines are in operation with complete flue gas cleaning systems from Götaverken Miljö, most of them also including water treatment systems. The installed processes are mainly wet scrubber systems, but bag filters and semi-dry systems are also represented. We are now focused on upgrading the flue gas treatment systems at existing plants to meet the increasingly restrictive environmental requirements, and also on the delivery of our unique and compact sub-systems to new installations.

Processes, that can be integrated in complete flue gas cleaning systems, include:

Scrubber technology with specialisation on dioxin and mercury removal (ADIOX^® and MercOx)

Specially designed water treatment system, including gypsum precipitation connected to the flue gas cleaning process.

Energy recovery through condensation of the flue gases including a heat pump installation, where appropriate.

Specific technologies of flue gas treatment

ADIOX^® for absorption/adsorption of dioxin.
MercOx for mercury removal.
Hydrochloric acid (HCl) separation in wet scrubber systems.
Sulphur dioxide(SO₂) -separation with NaOH or Ca(OH)₂ in packed bed scrubbers or in open scrubbers.
Water treatment systems.
Gypsum precipitation as part of the water cleaning system.
Special process for separation of sulphur dioxide: SO₂ in extreme concentrations and at low gas flows (approx. 100.000 mg/m³ SO₂for a few thousand m³/h gas) is separated in a special process with Ca(OH)₂as alkali. The residual product is typical of dewatered gypsum. Applications in foundries and the process industry.
Hydrofluoric acid (HF), dust and heavy metals can also be separated in the above gas cleaning processes.

References