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The Emschergenossenschaft operates a two-line sewage sludge incineration plant with subsequent flue gas cleaning at the location of the Central Sludge Treatment Bottrop.

In parallel to the construction of a solar thermal sewage sludge drying system, the flue gas cleaning is renewed by a conditioned dry sorption with subsequent washing in order to be able to safely meet the high emission requirements.

In this pioneering project, ENVIROTHERM received the General Contractor order to plan, deliver, install and commission the modern, wastewater-free flue gas cleaning system (FGC) downstream of the existing electrostatic precipitators up to the chimney.

The core components of this system are the two fabric filters with ENVIROTHERM’s own technology, which ensure high availability at low operating costs.

The scope of supply also includes the upstream evaporation coolers, the downstream two-stage scrubbers, the ID fans, the common chimney and the entire storage and conveyance of the operating media like lime hydrate, activated coke and caustic soda.

Technical data:

Flue gas quantity: 27,800 Nm³/h (nominal, moist)
Flue gas temperature at inlet of FGC: 240 ° C

In December 2017, ENVIROTHERM GmbH was awarded a contract for the renewal of an existing flue gas treatment system within a waste incineration plant in Norway. The customer FREVAR KF in Frederikstad (90 km south of Oslo) operates a waste incineration plant with 2 lines. As part of the revamping, the existing flue gas cleaning system will be replaced by a semi-dry and waste-water free flue gas cleaning plant.

In order to increase the efficiency of the plant a high-temperature and a low-temperature heat exchanger are added to the existing water-steam cycle. The fabric filter represents the key component in such facilities. Therefore ENVIROTHERM uses its own technology – the very efficient Low Pressure Filter (LPPJFF), which offers significant advantages in terms of availability and operating costs compared to other solutions. The construction works will not impact the regular operation of the waste incineration plant. The “tie-in” within a standstill of 3 weeks, only will take place in October 2018; thereupon FREVAR KF will resume the operation of the renewed facility.

Order entry date: 12.12.2017

Hansol SeenTec, ENVIROTHERM‘s Korean co-operation partner, received another order for the supply of two steam generators for power production in Pocheon. Their firing systems apply ENVIROTHERM’s Circulating Fluidized Bed Technology. Based on coal and biomass 288t/h high pressure steam will be generated by each of the CFB boilers at lowest emission values.

With the receipt of this order from their Korean client GS E&R Hansol SeenTec has contracted the fourth CFB boiler within less than three years of our co-operation. As such they have established themselves as the most successful supplier of CFB boilers in Korea since then.

ArcelorMittal Asturias owns a Coke Plant in Asturias which was cold idled and was revamped and put back in operation. The existing facility used to work with 3 ETP’s which were not possible to reuse due to their bad condition. The ENVIROTHERM Electrostatic Tar Precipitator (ETP) was chosen as the best available technology to remove the tar content from coke oven gas with 99.95 % efficiency.

Client: ArcelorMittal Asturias
Location: Gijón, Spain
Order entry date: 12.06.2017
Completion: June 2018
Type of Contract: Turnkey, Fixed Price
Type of Filter: 2 x Tar ESP type 241 / 5500 / SW250

Scope of supply

Design, fabrication and supply of the filter and high-voltage control system as well as erection and commissioning supervision.

Process conditions

Gas Flow (actual): 60.000 m³/h
Temperature: 22 °C
Inlet Dust Burden: 20 g/m³ (STP, dry)
Dust to be collected: Tar
Guaranteed Emissions: ≤ 10 mg/m³ (STP, dry)
Length of honeycomb bundle: 5500 mm
Number of honeycombs: 2 x 241

A delegation of our South Korean co-operation partner Hansol SeenTec paid a visit to ENVIROTHERM to evaluate co-operation results reached so far. On this occasion, both CEOs agreed that the placement of orders comprising the delivery of six CFB steam generators within just two-year’s time marks an exceptionally great success. It was agreed to intensify the co-operation.

BIR is Norway’s second largest waste management company and is responsible for waste handling from approximately 340.000 inhabitants in the municipalities owning BIR. BIR Avfallsenergi AS is a subsidiary of BIR. The objective of BIR Avfallsenergi is Energy-from-Waste recovery of the waste generated by the region’s inhabitants.

Construction work of the EfW plant began in June 1998 and in the year 2000 the plant went into operation. The plant has a capacity of 210 000 t/year. The plant consists of two lines of incineration, steam generation, district heating, energy recovery (turbine, generator and atmospheric condenser) and flue gas purification including baghouse filter. BIR Avfallsenergi AS planned to replace the existing baghouse filter of line 1 from their waste to energy plant after approximately 16 years of operation with a new one due to wear and corrosion.

The bag filter is placed downstream the steam-to-gas heat exchanger to clean the flue gas from remaining dust and other pollutants downstream the scrubber. Residues will be transported from the bag filter to a common recirculation buffer or spent sorbent silo. The scope of supply for the bag house filter includes engineering, manufacturing, transport, dismantling of the existing bag filter, erection, commissioning, performance responsibility and documentation. The short time for tie-in was the most challenging task. The bag filter was successfully replaced in a standstill of six (6) weeks in October 2016.

Order entry date: 14.12.2015

During their first joint trade fair appearance 01-03 Sep 2015 ENVIROTHERM and its co-operation partner Hansol SeenTec presented the circulating fluidized bed (CFB) firing technology designed to be applied for highly efficient and eco-friendly power supply systems.

The significant public interest aroused at the PowerGen trade fair in Bangkok is understood to be a clear evidence of the high acceptance rates met by CFB steam generators which Hansol SeenTec is now going to bring to markets in Southeast Asia following the strong performance the company showed in its home country.

Megacities in China suffer from severe air pollution caused by smog and particulate matter. In this respect, ENVIROTHERM offers wet-type electrostatic precipitators designed to reduce this environmental burden. Thanks to this, the company succeeded in gaining respectable scores on the Chinese market.

Since mid-2014 licence agreements on this technology have been concluded with three Chinese partner companies. The Dongfang Boiler Group in Zigong City, the Shanghai Golden Construction Group and the General Electric Equipment Company in Nanjing belong to the circle of partners.

Since that time, our licensees have already managed to be awarded four contracts on wet-type electrostatic precipitators for power stations in the 300 and 600 MWel size ranges. After a short production and erection time, the first precipitator was commissioned in February 2015 already. A wet-type electrostatic precipitator for a 1000 MWel power station is currently being engineered and designed.

Support rendered by ENVIROTHERM to licensees encompasses comprehensive training procedures as well as assistance with systems design and commissioning.

The Danish energy provider DONG Energy Thermal Power A/S has awarded to ENVIROTHERM the order for the delivery of a flue gas treatment system for two new biomass fired boilers which will be installed in their Skærbæk power station close to Fredericia. The contract comprises the turnkey delivery of baghouse filters for both boilers, the installation and the commissioning of the system, which will ensure that the rigid emission values will be met.

The overall project is scheduled to go on stream in early 2017 and deliver district heating for some 183,000 customers of DONG Energy and electric power to the public grid.

Order entry date: 24.03.2015