Aalborg Energie Technik a/s Biomass Cogeneration Plant

Boehringer Ingelheim, Germany

The Task

The original coal-fired CHP plant was commissioned in 1983 to supply the pharmaceutical company with power and process steam.

In 2004, the company decided to change from coal to biomass and asked AET to perform this conversion. Since then, AET has regularly supported Boehringer Ingelheim and ensured optimal performance of the plant.

The Solutions

Retrofit in 2004: 100% biomass-fired boiler

In 2004, AET retrofitted the CHP plant from 100% coal-fired to 100% biomass-fired.

This retrofit included a fuel dosing system, AET Biomass Spreaders, AET Combustion System including modification of furnace, superheaters, flue gas and flue gas recirculation systems, flue gas cleaning with absorbent system for utilisation of demolition wood A1 - A4 and AET SNCR DeNOx System for NOx reduction.

Upgrade in 2005: Ash re-injection and fly ash transport

In 2005, modifications of the ash handling and carbon re-injection systems were made in order to obtain a higher efficiency of the plant.

Upgrade in 2006: AET SNCR DeNOx System with chemical injection lances for ChlorOut system

The upgrade utilises the ChlorOut system for protecting the internal parts of the boiler and the superheaters against high temperature and heavy metal-chloral salt layer corrosion and fouling.

The ChlorOut system is advanced, as it is a two-step injection with dedicated sulphate liquids in order to reach a certain KCl level and reduce emissions. The KCl level is monitored by an in-situ Alkali Chloride Monitor (IACM).

In 2016, Boehringer changed the chemical injection from ammonia sulphate to iron sulphate in order to avoid a high ammonia slip.

Customer Statement

"In our conversion from coal to biomass, Boehringer Ingelheim partnered up with AET. In the process from first approach, design criteria, conversion job and further to commissioning & handover Boehringer Ingelheim felt confident with AETs high involvement and huge knowledge in the biomass & boiler technology. The plant is now converted for optimal operation and high performance."

Additional Information

• To obtain more information about this biomass-fired plant and about AET: Contact AET Sales.