EEI has designed, manufactured and supplied as per ASME, HEI, and IS code of practice, more than 315 Deaerators from 6,000 kg/hr to 595,000 kg/hr and feed water temperature at the outlet of deaerator ranging from 105 degrees Celsius to 182 degrees Celsius, to all boiler manufactures and also to the power industries in India and abroad.

Deaerator is an equipment used for the removal of impurities from feed water like dissolved oxygen, carbon monoxide, carbon dioxide and content of Sulphur.  In addition to removing free oxygen and dissolved gases, a Deaerator Tank provides the advantage of heating boiler feedwater. Expansion and contraction of heating surfaces and the thermal shock are reduced and also a reduction in fuel consumption by adding hot feedwater to a boiler.

Theory of Deaeration

  • A dissolved gas is removed by reducing the partial pressure of that particular gas in the surrounding atmosphere.
  • The solubility of any gas dissolved in any is directly proportional to the partial pressure of gas above the liquid.
  • The heating system is provided with trays, steam header inside the Deaerator.
  • First row of trays are designed to act as a condensing stage which allows only the non-condensable gases to escape and vent losses of steam is appreciably controlled.

The Deaerator is made of two parts:

  • In the upper tank, Deaerator Tower, deaeration is done and the water is heated
  • In the lower tank, Deaerator Storage Tank, deaerated feed water is stored

Spray & Tray Cascading System

  • In order to accomplish high degree of efficient deaeration, water is sprayed through various spray nozzles arranged below the water header.
  • When water enters the nozzle at pressure, fine mist generated by whirling action of vanes.
  • Mist so created passes through various stages of trays arranged in rows.
  • Incoming steam not only heats the tray but also removes dissolved gases.

By the time water reaches
a.       Stage 5 – Devoid of O2 & CO.
b.      Stage 7 –  Co2
c.       Stage 8 –  So2

  • Condensation of steam is reduced to negligible degree because of already preheated water and most of the steam remains at vapour.

Deaerators Manufacturers

Our range of Deaerators includes Horizontal Deaerators, Vertical Deaerators, Spray & Tray type Deaerators.

We have manufactured and supplied deaerators to Sharjah Electricity and Water Authority (SEWA), Sharjah, UAE, with specifications: 595 TPH and 182 degrees Celsius outlet temperature.

Spray and tray type Steam Deaerators are water treatment systems used to remove dissolved gases from the boiler feed water and hence to heat feed water to enable the production of high-quality steam for power generation and process requirement.

Advantages of Deaeration

  • To reduce internal waterway corrosion
  • To improve boiler efficiency
  • Reliable means of assisting with the recovery of both High Pressure (HP) and Low Pressure (LP) condensate recovery
  • Cold water feed to the boiler is not conductive to high efficiency
  • Reduce the cost of chemical treatment
  • Reduction of O2 and CO2
  • These functions will cut down the amount of phosphate additives and eliminate the need for sulphate or hydrazine additives. This will also reduce the amount of blowdown
  • Almost 90% of dissolved O2 will be removed by heating the water to saturation temperature. Remaining O2 will be removed by deaeration
  • Condensate is prone to re-contamination upon cooling. Both CO2 and O2 can re-enter water. Consequently the returns are directed through the deaeration section with the following details for techno- commercial offer
deaerating capacity, outlet temperature of deaerated water, dissolved oxygen content required, availability of make-up water, steam and condensate with pressure and temperature.