MINIATURE-SCALE R&D TECHNOLOGY
FT94X HTST/UHT Mini Pilot System – Issue 4
The Armfield FT94X HTST/UHT Mini Pilot system extends the range of continuous operation scaled-down units offered by Armfield to 200 l/hr (30-100 l/hr standard format).
The unit combines full flexibility – plate and tubular heat exchanger options – with comprehensive instrumentation demanded of research and development equipment.
The FT94X is designed for operation as both a standalone unit and also for seamless integration into a full processing system with the capability of aseptic packaging of processed product.
- Touchscreen control for ease of use
- Compact, mobile, easy to install
- Continuous and batch operation
- Standard throughputs from 30-100 l/hr (dependent on conditions)
- Units capable of up to 200 l/hr on special request
- Process temperatures up to 150°C
- Capable of aseptic operation
- Membrane control console
- Fully instrumented
- Preheating by hot water (indirect)
- Heating by steam (indirect)
- Plate and tubular heat exchanger options
- Controlled product preheat and heating temperatures
- Simple and rapid switch over between heat exchangers
- Automatic product divert with temperature on tubular heat exchanger
- Built-in clean in place (CIP) and sterilisation in place (SIP) facilities
- Integral USB data logging
- Two-stage cooling option
- Electronic flow meter option
- Compact design and easy installation
- Low product hold-up (can operate with as little as 15l process batches)
- Suitable for producing large batches of material for extensive product testing
- Suitable for a wide range of products due to both plate and tubular exchangers
- From cold start to steady-state operation in a matter of minutes
- Switchover from one heat exchanger to another in a matter of seconds
- Designed for easy integration into a process line
- Links directly to sterile filling bench or sealed bag filling systems
FT94X UHT/HTST Service Unit
The FT94X service unit contains the services, controls and instrumentation required to operate the tubular and plate heat exchangers described below. The FT94X may be specified with either or both of the heat exchangers. Switching between the two heat exchangers takes a matter of seconds.
The service unit comprises: a 20cm colour touchscreen with the required controls and displays; a variable-speed progressing cavity product feed pump with inlet level sensor and alarm to warn of low product level; a steam-heated hot water system for product preheating; automatic steam control valves for product preheating and final heating; a centrifugal CIP pump and other facilities required for CIP and SIP.
Sensors show product inlet, preheat, final heating and outlet temperatures. Product preheat and final heating temperatures are set by the operator. Inlet and outlet product pressure is also shown. There are various service sensors: pressure, level and temperature – see process flow diagram for details.
A sophisticated data-logging package enables the measured data to be recorded onto a standard Windows PC (not supplied). The software records all temperatures, product and steam pressures, feed pump speed and many other sensor values. Data from optional accessories (eg the flow meter) is also recorded. Data may be displayed in tables and graphs (both real-time and comparisons across previous runs), and may also be exported to MS Excel.
Software requirements: Win 98, ME, 2000, XP
An alternative data-logging system (FT94-46) allows the temperature information to be recorded to an external computer via an ethernet connection, without any operator intervention. This is an ideal system for quality control purposes.
Plate Heat Exchanger
The FT94-30 uses the sanitary heat exchanger employing the latest plate design for efficient heat transfer. Performance scale-up is straightforward. The standard unit is a three-stage system with preheat (hot water) final heating (steam) and cooling (water/chilled water).
The plates have a complex pressed profile to maximise turbulence and minimise dead zones. There is a relatively large gap between plates to allow handling of more viscous products. The plates are fitted with food-grade Viton paraclip gaskets for easy replacement as these are simply clipped in place rather than glued.
A number of options are available to enhance the performance of the standard plate heat exchanger. These options involve additional plate configurations which can be supplied fitted or may be easily retro-fitted by the user.
The FT94-32 homogeniser interconnecting plate enables the homogeniser to be connected downstream of the heating section. The plate is fitted into the cooling section.
The FT94-33 two-stage cooling option provides a complete additional cooling stage, which can be used in conjunction with a chilled water/glycol supply for the best possible product cooling. Output temperatures below 5°C are possible depending on the product and the flow rate. An interconnecting link is provided so that the two stages can be operated as a single stage when required.
The FT94-30 has a five-second holding tube (at 50 l/hr) as standard. Contact Armfield for longer holding times.
FT94-20 Tubular Heat Exchanger Module
The FT94-20 is a standard tubular heat exchanger design using a series of concentric 316 stainless steel tubes for product preheating, final heating and cooling. In all cases the product passes down the inner tube and the heating/cooling medium passes through the annulus. Two heating tubes of 1.5 m length are used to preheat the product. Four similar tubes are used for product heating and an additional four tubes are used for product cooling.
Product is gently preheated using a hot-water system, which is itself heated by steam via a secondary service heat exchanger. In the main heating section the product is indirectly heated using steam itself. Product is cooled normally using water or chilled water. The cooling section can be configured to allow two stages where the first stage is water/chilled water and the second stage is water/glycol.
FT94-21 Static Mixers
The FT94-21 is a set of static mixers for two tubes. These significantly improve heat transfer with more viscous products and can be used for improving both heating and cooling efficiency. Multiple sets can be used to optimise both heating and cooling performance.
FT94-22 Product Divert Option
The FT94-22 product divert option enables product that has not been processed to a sufficiently high temperature to be diverted to drain, thus ensuring product quality and heat treatment. The divert temperature is adjustable. Diversion is achieved using a low hold-up twin-diaphragm valve block operated by compressed air and PLC controlled. Diverted product is cooled in a tubular heat exchanger before being led to drain.
FT94-20 Holding Tubes
The FT94-20 has a one-second holding tube (at 50 l/hr) as standard. Contact Armfield for longer holding times.
FT94-40 Flow meter option
|Flow range:||30-100 l/hr|
|Accuracy:||<1% @ 50 l/hr|
FT94-51 Feed Vessel
The FT94-51 Feed Vessel option, is a 50-litre stainless steel vessel with lid, fitted with a product outlet valve and a drain (or recirculation) valve. The assembly is mounted on castors for ease of movement.
FT83 Sterile Filling System
The FT83-94 allows sterile product produced by the FT94X to be packaged into presterilised containers in an aseptic environment – see separate data sheet. The FT94X contains all the necessary functionality to sterilise the FT83-94.
The FT94X can also be interfaced directly to a sterile sealed-bag filling system. Contact Armfield for details.
Contact Armfield for details of inline homogenisers for use with the FT94X.
- Baby foods
- Culture media
- Desserts and puddings
- Fruit and vegetable purees
- Fruit juices and cordials
- Gelatine products
- Ice cream
- Health and nutritional products
- Meat pie fillings
- Pet foods
- Ready meals
- Sauces and soups
FT94X Service Unit Specifications
|Feed pump:||Progressive cavity variable-speed pump|
|Solids handling:||Soft: 10mm
|Flow rate:||30-100 l/hr|
|Preheat water system:|
|Safety cut-outs:||Low level
Pressure relief valve
|Heating system:||External steam supply|
|Safety cut-outs:||Relief valve (7 bar)
Product pump off – (steam valve closes)
|Max product heating duty:||17kW (preheat + heating)|
Tubular Heat Exchanger (FT94-20)
|Number of tubes:||10 (2 preheat, 4 heating, 4 cooling)|
|Tube diameter (product side):||8.1mm|
|Material:||316 stainless steel|
|Assembled test pressure:||30 bar|
|Working pressure:||24 bar (maximum)|
Plate Heat Exchanger (FT94-30)
|Plate overall dimensions:||150x 480mm|
|Effective area per plate:||0.04m2|
|Plates:||316 stainless steel|
|Max differential test pressure:||11.5 bar|
|Max balanced test pressure:||12.5 bar|
|Max working pressure:||9.6 bar|
|Working temperature:||Max 170°C
|Number of plates:|
|FT94-33:||Secondary cooling: 7|
Heat output of 30kW (min 6.0 bar) – heating medium
7 l/s (min 7.0 bar, max 10.0 bar) – valve operation
10 l/min at 2 bar – product cooling
Required if 2-stage cooling option is specified
|Height:||1.55m (fitted with FT94-20)|