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Regenerative Rotary Air Preheater / Gas Air Heat Exchanger Ljungstrom Heating Elements

Categories Boiler Air Preheater
Brand Name: HD BOILER
Model Number: RAPH
Certification: ISO9001 , SGS , TUV , ASME , EN
Place of Origin: China
MOQ: 1 Set
Price: Negotiable
Payment Terms: L/C, T/T, Western Union
Supply Ability: 400 Tons per Month
Delivery Time: 50-100 Days
Packaging Details: Seaworthy Packing
Condition: New
name: ljungstrom air preheater
Type: Rotating Type ( RAPH )
Surface Treatment: Painted
Structure: Fire / Water Tube
Style: Horizontal and Vertical
Specification: Customized
HS Code: 3215960855
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    Regenerative Rotary Air Preheater / Gas Air Heat Exchanger Ljungstrom Heating Elements

    Product Description

    Airpreheater is a general term and represents any heater designed to heat air. It may be for residential use namely for room heating, house heating, etc. by means of gas, electricity or oil etc. In the present context reference is to the airpreheaters used in steam generators (boilers) for generation of electricity in Power Generation Utilities.

    The purpose of the air preheater is to recover the heat from the flue gas(exhaust gases) from the boiler to improve boiler efficiency. Incidentally the gases are sent to the chimney or stack at lowered temperature so that the design of the ducting and the stack becomes simplified. Also it controls the temperature of gases coming out of the stack.

    Different types

    For the use in Steam Generators (boilers)in Thermal power stations of Utility power stations, there are two types of design of the Airpreheaters. One is a tubular type built into the boiler outlet Flue_gas ducting and another one is of the regenerative type known as Ljungstrom (named after the name of inventor) Regenerative Air Pre Heater(RAPH),a rotating type. This may be horizontal (now very common in power generation utilities) or vertical.

    Ljungstrom (RAPH)

    In this rotating type (RAPH) [3] the casing divides the same into two (bi sector type) or three (tri sector type) sectors by ducts connected to it. The seals on the casing and on the rotor divide the gas and air paths and the keep the gas/air leakages between the three sectors to minimum. Three sector types are very common now a days in power generation utilities.

    Construction features

    1. The vertical rotor of the same is supported on big thrust bearings at the lower side and has oil bath lubrication cooled by water circulating in the coils inside the oil bath. This arrangement is done for cooling of the shaft as this end of the vertical rotor is on the hot end of the ducting as well. The top end of the rotor has simple roller bearing to hold the rotating shaft in vertical position only.

    2. The rotor is built up on the vertical shaft with radial supports and cages for holding the baskets in position. Radial and circumrential renewable seal plates are also provided to avoid leakages of gases or air between the sectors or between the duct and the casing, while in rotation.


    Company Introduction

    Established in 1985,Zhangjiagang Hua Dong Boiler Co.,Ltd.(trading as HD Boiler),produces power plant; industrial; waste heat; waste incineration; biomass; organic heat carrier and electric steam boilers. Coupled with a comprehensive range of heating surfaces, HD Boiler brings to the market a unique service including boiler design , fabrication, installation, maintenance and replacement of boiler pressure parts.

    Contact Information

    Contact Person: Mr. Edwin zhao

    Business Phone: +86-17715177007
    WHATSAPP: +86-17715177007
    Skype: Edwin HD Boiler

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