CITECH

EAST YORKSHIRE, 
United Kingdom
http://www.citech.co.uk
  • Booth: A-C31


Feel free to visit our stand to discuss heat recovery.

As part of the Muhibbah Engineering Group, CiTECH are a prominent provider of gas turbine/engine heat recovery solutions. Having designed and delivered over 250 bespoke waste heat recovery units to the oil and gas, power generation and process industries, CiTECH have a history spanning 8 decades.

Brands: gas turbine engine power generation, waste heat recovery organic rankine cycle increased efficiency


 Products

  • CiBAS Waste heat recovery unit
    The CiBAS WHRU has been developed specifically for the oil, gas and power generation industries with built in silencer and flow control. The unique and patented design alleviates the need for a separate silencer, isolation and control dampers...

  • The single moving part within the CiBAS unit is the vertically modulating sleeve damper.  Gas flow is controlled by this simple unique cylinder.

    When the sleeve is in its uppermost position, a seal is made with the conical underside of the silencer plug. Gas turbine flow is directed over the high efficiency helical coil. The unit is in full duty mode.

    With the sleeve lowered, an effective seal is then made between its lowermost edge and the lower casing module. The heat exchanger is not exposed to gas turbine exhaust gas. The unit is now in full bypass mode.

    In reality, many CiBAS units currently in service, modulate between these 2 positions, with the sleeve positioned somewhere in-between. To meet the client’s thermal duty demands, some flue gas is allowed to flow over the coil - thus recovering heat, whilst the remainder is allowed to bypass.

    Unlike conventional types of damper arrangements that use louvre dampers (straight or curved), the sealing efficiency of CiBAS does not deteriorate in service, and is crucially, maintenance free.

    This single piece flow control device is of significant interest to both operators and gas turbine/engine suppliers alike. Even with mechanical linkages and control measures installed whenever louvre dampers are used, the risk of catastrophic failure is ever-present. If these devices fail, the possibility of both dampers being closed at the same time is a real one. Resulting damage to the turbine/engine could be significant. As the flow is controlled in CiBAS by a single item – it simply is not possible for it to be in 2 places at the same time. There is no possibility of blocking the gas path.

    The high efficiency helical coil heat exchanger is the core of the CIBAS WHRU. This module is made up from lengths of seamless pipe that have extended surface fins welded in a helix around them. The pipes are cold formed into a series of interlinked coils as shown below. The lengths of pipe used to construct these coils mean the number of welds required is vastly reduced from other types of WHRU – thereby significantly reducing the risk of failure.

    Material selection is made according to client’s requirements. The heat exchangers can be manufactured from economical carbon steel, stainless steels if run-dry operation is needed, or from more exotic materials if required. Although most systems supplied to date have been cold cased with internal insulation, hot cased units can be supplied if required.

    The unit is supplied with its own actuation unit – either pneumatic or hydraulic depending on client requirements and/or the size of the unit. The pneumatic system utilises the platforms / FPSO’s pressurised air system to activate 3 pneumatic cylinders attached to the control sleeve/ damper. The hydraulic system is a self-controlled closed loop actuation unit, comprising its own motors, pumps and fluid reservoir. Although, under loss of actuation pressure, the sleeve will fail-to-safe (into bypass) under its own weight, an accumulator is included as standard just to cover every eventuality.

    The WHRU can be fitted with instrumentation to fulfil the client’s requirements. Typically gas side temperature and pressure transmitters are fitted, but process instruments are also available if specified.

    All necessary ducting can be supplied to meet the project requirements. An inlet transition is often required between the Gas turbine outlet and the WHRU inlet. Expansion joints are fitted as necessary to accommodate the thermal expansions inherent with such large temperature fluctuations. Self-supporting exhaust stacks are commonly fitted – with additional support structures only required if the stacks become sufficiently high that the WHRU is unable to withstand the loads.

    The advantages of CiBAS

    • Weight saving typically of up to 30%.  
    • Footprint reduced by up to 60%.
    • Single moving part

    • Low maintenance

    • High reliability
    • Separate Silencer is NOT required.
    • Low exhaust gas pressure drop
    • Fully assembled and cold commissioned.
    • Low wind resistance.

    • Single piece gas flow control device.
    • Integral fail-to-safe bypass.
    • Lower maintenance requirements and downtime
    • Single lift item.
    • Reduced installation times. 
    • Proven technology

  • Twinstack WHRU
    The Twinstack by CiTECH, is a new concept in waste heat recovery. Combining the advantages of circular heat exchanger coils with conventional flow control measures gives a unique hybrid solution to satisfy client demands....

  • To meet the demands of the onshore power generation and ORC markets, CiTECH have combined the attributes of their circular CiBAS unit with a gas diverter, to launch the hybrid Twinstack system. Flue gas from the heat source (gas turbine, engine etc.), is controlled by the gas diverter to flow to either the bypass stack or heat exchanger coil. The gas diverter is a compact self-contained unit which utilises louvre dampers to direct the gas flow between duty and bypass paths. Cold and hot cased designs, in numerous orientations and layouts, are available to suit individual client needs. This system is suitable for new builds and retrofits - where the unit can be integrated into existing duct work, whilst maximising the available plot space.

    This hybrid heat recovery system designed to maximise the benefits of new and established technologies.

    Advantages of Twinstack

    • 100% Sealing
    • No residual heating when in bypass
    • Process flow turn-down to zero
    • Total isolation of waste heat recovery unit is available
    • Numerous orientations and layouts
    • Fewer welds in comparison to conventional WHRUs
    • Hot or ATEX compliant cold case designs
    • Simple and quick installation
    • Each unit designed specifically for client needs
    • Single lift installation (WHRU)
    • Low wind resistance
    • High efficiency helical heat exchanger
    • Suitable for retrofits and new builds

    Unlike the standard CIBAS WHRU, the Twinstack option removes the turbine/engine flue gas control from within the unit and in its place uses an external 3-way gas diverter.

    By using a compressed air system feeding into the diverter arrangement, 100% sealing can be attained – thereby eliminating any residual heating to the heating medium when in full bypass mode. To prevent any possibility of blocking the GT exhaust, the twin louvre dampers are mechanically linked.

    The image shows a typical orientation. However this system is extremely versatile, lending itself to multiple layouts and orientations. The gas diverter itself can be horizontal or vertical. It can be positioned at floor level or above an existing building.

    Although the unit can be supplied for new-build developments, CiTECH are seeing significant interest for retrofit projects. Clients are increasingly looking to increase the efficiency of their plant. Recovering the heat energy from a gas turbine/engine exhaust is one of the most cost effective solutions to significantly improve plant efficiency. Return On Investment can often be as low as 2 years. To reduce costs further, existing exhaust ducting and stacks can be utilised.


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