DALO wants to issue a framework agreement for support, maintenance, modification and configuration of the Digital Airless Multipoint SCR systems (Selective Catalytic Reduction), which is installed in six patrol vessels of the DIANA-class.
The DIANA-class patrol vessels patrols in the area around the Danish borders and conduct among others surveillance, search and rescue operations (SAR) and oil pollutions operations.
In order to meet future air pollutant requirements the vessels has been equipped with a SCR system for reduction of the NOx pollution from the main engines. The system is developed by Dansk Teknologi. The company has patented the Digital Airless Mulitpoint injection system.
The scope of the system is to inject Urea into the exhaust gas, which is converted to ammonia (NH3). In the catalyst the NOx is reduced with the ammonia and the output will be harmless nitrogen (N2).
Roughly, the system consists of the following parts:
- SCR catalyst divided in four elements.
- Urea tank
- Digital dosing pump
- Valve and pressure sensor panel with pulsation damper
- Sootblowing system
- Urea injection section equipped with airless Urea injection nozzles, temperature sensor and NOx sensor
- Temperature and NOx sensor in the exhaust outlet
- SCR control unit
The NOx reduction performed by the system is 90-98 percent.
The SCR system is installed as an addition to the existing MTU exhaust system but if the system has malfunction it can be switched off without any further precautions save for regularly sootblowing to protect the catalyst.
The service must be conducted by certified personnel who have the required education and expertise to conduct the service and maintenance in accordance to the manufacture’s requirements, including updating and maintenance of the software for the system.
It is furthermore required that the bidder have access/agreements needed for conducting service on parts, processes and software in the system, which are protected by patented parts and processes. The system has the following patents:
PCT/DK2008/050286: Nozzle arrangement
PCT/DK2008/050045: A system and method for dosing fluid.
PCT/DK2007/050077: Pump for feeding urea to an engine exhaust system
PCT/DK2007/050170: Nozzle and method for atomization of fluid
PCT/DK2007/050143: Nozzle temperature control
PCT/DK2006/050084: Fluid transfer system and method
PCT/DK2006/050074: Nozzle with impinging jets.
PCT/DK2006/000272: Atomization of fluids by mutual impingment of fluid streams.
PCT/IB2001/001880: Metering pump with with an electric motor.
PA/2009/70217: System for Selective Catalyst Reduction (pending patent)
The tender encompasses:
A)Regularly maintenance and updating of the SCR-system.
B)Regularly support of the SCR-system.
C)Modification and configuration of the SCR-system.
D)Regularly associated consultancy support for the SCR-system.
E)Deliverance and hosting of an Information Management system, supply chain services and help desk service.
F)Education to DALOs employees in using and maintaining the SCR-system.