The ALTERNATIVE

Heat exchange elements for regenerative air heaters of power stations

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Todays resources economy is tomorrows well-being of our children

Regenertiv Air Heater

What is a regenerative air heater?


  • Lately all branches of industry and especially power engineering, that is the main fuel consuming branch, pay great attention to the economy.


  • In the boiler-rooms of each station they are working out the ways of how to improve the technological process and how to modernize the equipment.


  • There is the equipment providing efficient functioning of a boiler in the construction of any boiler plant. Thus, a regenerative air heater is designed for utilization of heat resulting from gases that come out of a boiler and for heating air that goes into a boiler. Lowering temperature of gases that come out and rising temperature of air that is taken from the surrounding atmosphere gives a chance to reduce most of the leakages in a boiler these are the leakages of coming out gases. As a result, its possible to improve the plant efficiency.


  •          Constructive design of a regenerative air heater is as follows: its a cylindrical hollow rotor (see Figure 1) with the diameter from 4.1m to 14.8m, depending on the size. Some regenerative air heaters have less rotor diameter. Baskets of heat exchange elements are placed in the cells of rotor sectors. These sectors are formed with the radial walls (rays) made of steel sheet. The width of the sheet is almost 10mm. There are from 18 till 24 sectors. Cross walls between the rays have the same width and form rotor cells together with the rays. (There are no cross walls between the rays in the cold end of some regenerative air heaters. In this case the cold-end baskets are placed through the hatches of the rotor ring).

             The rotor together with installed baskets of the heat exchange elements is revolving on its center. Air and gas streams go through the air channel and flue-gas duct of a regenerative air heater (see the scheme: Fig. 1 The scheme of a regenerative air heater).

             Gas and air streams are separate and continuous, and heat exchange elements go through these streams alternately. In the gas part of a regenerative air heater metal heat exchange elements of the sectors accumulates heat and after that gives it to the air stream. As a result of it, there is a continuous air heating generated by heat exchange that is accumulated by the heat exchange elements in the gas stream.

             There are baskets of hot and cold end, according to their disposition in the rotor. The hot layer heat exchange elements are placed at a gas stream entry inside a regenerative air heater and the cold-end heat exchange elements are placed at an air stream entry.

            Service life of baskets depends on concrete conditions of maintenance of a regenerative air heater and is approximately from 4 to 6 years.

            Such a low resource can be explained by the presence of 2SO4 (sulphuric acid) in the stream of flue gases. It causes intensive low-temperature metal corrosion of the air heater surface, mostly of its cold end (both gases and air), which is in the area of the lowest temperature.

    EnSERTIKO


    The production is certified
    in EnSERTIKO system

    Figures showing your boilers functioning
    after installation of the heat exchange elements made by us
    will tell you more than you can hear now.
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