Selection of 16 products among
16
GAS-GAS HEATERS
The Howden rotary regenerative heat exchanger is widely used as a gas-gas heater in wet flue gas desulphurisation processes. Prudent selection of materials, together with advanced design features,
result in a heat exchanger with high performance and exceptional resistance to the cool moist conditions of flue gas desulphurisation (FGD) plant, where fouling and corrosion are a constant challenge.
Our design of gas-gas heater (GGH) incorporates fixed “VN” sealing. This ensures that there is no leakage drift on the GGH over an extended period of operation and, hence, no corresponding increase in the SO2 levels to the stack. If such leakage drift did occur, the FGD system would have to work progressively harder to achieve the required SO2 removal efficiency.
The thermal performance of GGHs is critical, as the reheated gas outlet temperature must be kept above the minimum specified value to achieve adequate flue gas buoyancy and ensure plume dispersion.
Extensive site tests have confirmed the high thermal performance and sealing of our GGHs. We have developed efficient, fully retractable, combined cleaning devices, with the facility for normal sootblowing and both high and low pressure water washing, in order to maintain low-pressure drop. With these devices we can offer 'on-load' maintenance capabilities that are essential to maintaining GGH availability over extended operation.
The element profiles used for gas-gas heater applications are chosen to combine thermal and pressure drop performance with easy cleaning. They have been proven over many years of operation in a large number of GGH installations.
We use specially developed enamel coatings to protect the elements from corrosion and utilise the Howden SurePack® Elements packing system to ensure that they remain tightly packed during operation and cleaning.
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Burton Corblin
FLANGE IMMERSION HEATERS
These are particularly suitable for heating and maintaining the temperature of large volumes or heating circulating fluids such as water, heavy fuel oil, thermal fluid, air or gas. They can be
fitted on tanks, cisterns, boilers and circulation reheaters and are the best electrical heating system for a range of industries such as food processing, chemicals, textiles, plastics etc.
The stainless steel or incolloy armoured elements are generally hairpin-shaped and are welded to the DIN/ASA standardized flanges according to procedures which have CODAP, TÜV and ASME approval.
The watt density, ranging from 0.1 to 15 W/cm², is determined from the working parameters of the process and the exchange coefficients. For a maximum immersion length of 3300 mm, the power delivered by a flange immersion heater can reach several MW.
The electrical cabling in one or more paces gives access to several power steps. Connection blocks and rods are used to ensure the electrical connection.
The array may be fitted with a temperature control system whereby the power and specific load are controlled by parameters such as flow rate, pressure, viscosity, temperature etc.
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CETAL
SCREW ON IMMERSION HEATERS
CETAL has extensive experience in these screw plug immersion heaters, which are commonly used for heating static or circulating water, rinsing baths, special oils, acids, heat transfer media, heavy
fuel oil or gas.
Screw-on immersion heaters are made of three or six copper, stainless steels or incolloy heating elements, depending on the heated fluid, brazed or welded on assembly plugs, with metric or British thread sizes.
They are used for heating static or circulating water, oils or other specific liquids, air or gasses, at a maximum operational pressure of 15 bars. Power ranges from 100 W to 35 kW, for 230 V – 380 V – 690 V or other specified voltages. Watt densities are adapted to the customers' requirements. ATEX certified products are available for explosive atmospheres.
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CETAL
