TI-700_eng-R1 - iNook

no. : TI-700_eng rev. : 1

page : 1 von 6 TECHNICAL INFORMATION

date : 14.10.10

SCHNEIDER-High Pressure Steam Generator for closed circuits - Series iNook

1. Functionality The iNook is a High Pressure Steam generator of vertical design especially developed for closed circuits. He is installed directly below the steam consumer (the condenser) connected to it and not capable of being shut off. The generated high pressure steam transports the heat into the condenser where the heat energy is transferred in a thermal process by condensing. High Pressure Steam Generator iNook and Condenser are operated in an absolute closed circuit driven by natural circulation. Since the natural circulation works by gravity only one has to heed during design and installation that the condensate returns to the iNook without any obstruction. In other words sufficient difference in altitude must be provided secured by locating the condenser directly above the iNook not to mention that the difference in altitude has to be calculated for each project. Fur-thermore the steam and condensate connections between the iNook and the condenser must be sufficient designed in means of dimensions, installed with sufficient incline, no strictures, no bends, no components such as valves etc. Figure 1 - iNook

The iNook installed in a closed circuit allows an operation without the regular boiler equipment such as water level control and feed water pumps. To avoid water leakages all connections of sup-ply and return lines, connections with equipments are welded or for safety valves monitored by automatic leakage control.

Doc.: TI-700_eng-R1 - iNook.doc SCHNEIDER Engineering GmbH Email / Internet Hildburghauser Strae 79 [email protected] 12249 Berlin www.schneider-kessel.com Tel.: +49-30-75 44 93 99-0 Fax: +49-30-75 44 93 99-21



date : 14.10.10


2. Design Features

The iNook is a vertical designed boiler High Pressure Steam Generator without a steam drum. In means of flue gas system the iNook is a Three Pass Boiler where the furnace is the 1st pass and the 2nd and 3rd pass are formed by the concentrically arranged tube coils of the convection part. The burner is installed as roof burner on top of the boiler. The iNook consists of two (2) concentrically arranged tube coils in Mem-brane Wall design with the latter as the most superior advantage in compare with other boiler brands designed without steam drum for closed circuits.

The superior advantage of the Membrane Wall design secures that the vertical evapora-tor tubes can be welded into the bottom and top ring collectors without reduction. This de-sign feature is the ultimate precondition to en-sure unobstructed water flow and hence ther-mal overheating even during peak loads and/or sudden load fluctuation which very of-ten result in tube cracks. The gap between the vertical tubes is flue gas tight closed by mem-branes a reliable design feature which is tried and tested and used for water tube boilers world wide.

Figure 2 - Boiler Sections Burner/Flame/Vessel (1st, 2nd and 3rd pass)




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iNook Design Other Design

(Membrane Wall) (Tube-to-Tube Wall)

Figure 3 - Membrane Wall Design versus Tubeto-Tube Design

Figure 4 Manufacturing of membrane wall tube cage




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3. Main Characteristics of iNook Safe and reliable operation due to Membrane Wall design, no risk of surface overheat-

ing by obstruction of circulation.

Minimized furnace volume load and heating surface load by thoroughly adjusted boiler design.

Ideally adjustably to limited spaces by compact design.

Self supporting design and unobstructed vertical expansion.

High flexibility of fuel range.

72 hrs supervision free operation by state-of-the-art electronic boiler control system.

No hazardous substances such as thermal oils used for heat transfer.

No risk of corrosion in the steam and condensate system due to welded connections instead of flanged.

High plant efficiency by optimized and efficient heat transfer avoiding flue gas leakages by using the Membrane Wall design.

Possibility of further increasing the plant efficiency by utilizing the flue gas heat i.e. with waste recovery systems such as combustion air pre-heater.

Pre-assembled boiler system including control box, electrical wiring etc. minimizing the installation time on site.

4. Application The iNook supplies high pressure steam for process engineering plants where special safety regu-lations are enforced especially in productions where leakages shall not contaminate the product. This requirement can only be met with water of treated quality but not when using thermal oil for heat transfer.

Hence the main application of the iNook is the entire food industry especially focussed on

- deodorant of edible oil and fat

- distillation, fractioning and esterification of various raw materials




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5. Manufacturing and Equipment Design and fabrication of the iNOOK is in accordance with the German Technical Regulation for Steam Boiler (TRD) respectively Euronorm EN-12953 in connection with the Pressure Vessel Di-rective DGRL 97/23/EG as stationary boiler (land-based boiler).

The fabrication is supervised and monitored by TV the German Steam Boiler Supervision Author-ity. In addition we are able to deliver in compliance with standards such as ASME, BS, Vincotte, Stoomwezen, APAVE, ISPESL, DOSH, Australia, New Zealand, Japan, etc.

Boiler equipment and control systems are certified by the respective classification authorities.

Depending on the specific requirements the iNook is equipped with the matching equipment. Deci-sive for the selection of the equipment are:

required level of automation i.e. supervision free operation

required control and monitoring grade

required grade of minimizing of operational costs

required grade of plant efficiency

required grade of plant safety and plant availability

fuel availability

Basic equipment of the iNook

pressure body including boiler casing and insulation

firing system in monobloc design for

o gaseous fuels such as natural gas L and H, bio gas, LPG o liquid fuels such as LFO, HFO, bio diesel

control box including the control system such as

o pressure control o burner control o boiler safety chain with emergency push button o main power supply connection

1 safety valve with rupture disk and leakage control

2 low water level limiter




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1 pressure switch

1 pressure limiter

1 pressure transmitter

1 direct reading pressure gauge with gauge valve

1 flame sensor

1 test valve for water level

1 feed and drain valve with check valve

Optional equipment for the iNook

firing system in monobloc design for additional 2 alternative fuels including control sys-tem

cascade control when more than one (1) boiler are in operation

feed forward control i.e. by product temperature

2nd safety valve including rupture disk and leakage control

exhaust gas temperature limiter

boiler water filling pump including equipment.

6. Technical Data We supply the iNook in the capacity range from 150 kW up to 4000 kW. Boilers for larger capaci-ties are available upon request and will be custom designed.

For further technical Information we kindly refer to the following data sheets:

SCHNEIDER high-pressure steam generator as natural circulation boiler

Type iNook

f DB-402 iNook (Dimensions) f DB-406 iNook (PID)


Name :Ch. SchneiderName :W. SchneiderName :M. KraatzDatum :14.10.2010Datum :14.10.10Datum :14.10.2010FunctionalityDesign FeaturesMain Characteristics of iNookApplicationManufacturing and EquipmentTechnical Data

TI-700_eng-R1 - iNook

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