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For steam driven cargo pumps

Superheater for auxiliary boilers

As part of our focus on developing Green Technology, Aalborg Industries has developed a superheater system for auxiliary boilers that provides fuel savings in connection with the operation of steam turbine driven cargo pumps on board tankers. The savings derive both from a reduced flue gas outlet temperature of the boilers and from higher thermal efficiency of the turbine when running with superheated steam.

MISSION XW superheater


Aalborg Industries has a reputation for being the trendsetter in the marine boiler industry and in the forefront when it comes to product development. Our latest initiatives focus on the development of new products that mitigate the impact of emissions from burning fossil fuels on board ships, besides working with related equipment suppliers towards improving the efficiency of the total plant rather than just the boilers.

The MISSIONTM XW superheater is based on the same characteristics as our wellknown water tube, forced circulation exhaust gas economizer MISSIONTM XW specially designed for heat recovery from auxiliary boilers. When applied for heat recovery after auxiliary boilers, the heating surface and associated accessories are designed for the flue gas temperatures and flow rates of the Aalborg Industries auxiliary boilers with focus on the operation efficiency and reliability, thus providing full benefit of the saved energy during operation of the cargo pumps. Without changing the heating surface of the auxiliary boilers, the exhaust gas temperature will be sufficiently high for superheated steam productions. This ensures the same high efficient auxiliary boiler operation during saturated steam operation.

The temperature of both flue gas and steam will vary insignificantly with the load on the auxiliary boiler when the superheater is installed downstream of the boiler. The superheater is supplied loose for installation in the flue gas pipe close to the outlet of the auxiliary boiler, and must be supported separately by the ship structure. The superheater design allows dry running when only saturated steam is needed for general service purposes, i.e. a flue gas bypass is not mandatory. The system has been developed in close cooperation with a reliable supplier of cargo pumps and steam turbines with a view to improving the overall total steam plant efficiency and thereby reducing emissions from our existing well proven products. Naturally, the system operates equally well with other cargo pumps suitable for superheated steam operation.

Service steam To cargo pumps Feed water control valve Steam dump valve for inert gas operation MISSION XW Superheater


To hot well Cooling water Clean condensate Dirty condensate

Feed water control valve MISSION OL Oil-fired boiler


MISSION XW Superheater


MISSION OL Oil-fired boiler


Steam dump condenser for inert gas operation

Oil detection

Chemical dosing

Sample cooler

Chemical dosing

Sample cooler

Hot well Drain Salinity monitoring

Steam injection

Feed water pumps

An attractive opportunity for new vessels

With today's increased focus and further demands on reduced emissions of harmful exhaust gases like CO , SO , PM and NO into the environment, this system offers an attractive opportunity for new vessels. The system is also worth considering for existing tankers in service equipped with the new generation of cargo pumps suitable for operation with superheated steam.

2 x x

Depending on the number of discharges per annum, the return on investment (ROI) can be as low as 1.5 year. Superheater for auxiliary boilers Provides operational savings while improving the environmental profile of the ship Major improved efficiency on cargo pump turbine system Fuel savings can be as high as 10-15% Return on investment (ROI) can be as low as 1.5 year Lower EEDI of vessel due recovery of waste heat

A tanker concept typically consists of 2 x MISSIONTM OL boilers. MISSIONTM OL is a high performance, large capacity oilfired marine boiler with a steam capacity range from 12 to 55 t/h. Aalborg Industries has delivered nearly 2.500 MISSIONTM OL boilers to tankers since 1998.

When a waste heat recovery (WHR) system is installed on board the ship, the steam turbo generator can be operated also in port by means of the auxiliary boilers. In this case, the superheated steam will improve the turbine operation conditions and reduce the steam and fuel oil consumption.

Project case example

Suezmax tanker

n Cargo oil pump: KV450, 3500 m3/hr x 135 n Cargo oil pump turbine: RX2-2 or RVR-1, 1550 kW x 1390 rpm

VLCC tanker

n Cargo oil pump: KV500, 5500 m3/hr x 155 n Cargo oil pump turbine: RVR-2, 2680 kW x 1200 rpm

Turbine model Turbine Q'ty Inlet presseure Inlet temperature Steam rate Boiler capacity Boiler load Efficiency Fuel oil consumption Fuel oil savings Fuel oil savings

Set MPa °C Kg/h t/h %MCR % Kg/h Kg/h %

RX2-2 3 1.85 Sat. 49.292 2 x 30 82.1 84.90 2 x 1836 N/A

RVR-1 3 1.85 250 40.827 2 x 25 81.6 84.50 2 x 1553 2 x 303 19

RVR-2 3 1.85 Sat. 68.342 2 x 40 85.4 84.50 2 x 2545 N/A

RVR-2 3 1.85 250 64.242 2 x 40 80.3 84.50 2 x 2399 2 x 146 6

Green Technology

As market leading manufacturer of highly efficient and environmentally friendly equipment for the maritime market such as marine boilers and heat exchangers, thermal fluid systems and inert gas systems, the Aalborg Industries Group develops new green solutions to support our customers in building and operating their commercial fleet to the highest standard for low environmental impact.

Australia: +61 2 4399 0000 Brazil: +55 24 2233 9963 China: +86 21 6164 2077 Denmark: +45 99 30 40 00 Finland: +358 10 838 3100 Hong Kong: +852 2836 3826 Japan: +81 78 271 5720 Korea: +82 51 703 6162 Netherlands: +31 181 650 500 Singapore: +65 6261 9898 UAE: +971 4 3241 061 UK: +44 1924 242500 USA: +1 954 435 5999 Vietnam: +84 4 3936 2832

[email protected] [email protected] [email protected]

© Aalborg Industries Global Marketing/DK - June 2010



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