HN GAS

HN/HNX-GAS GENERATOR

The Basic Process

The process is based on the combustion of hydrocarbons with air.

Ratio Control

The ratio between combustion gas and air is kept constant by means of a fully automatic ratio control. In addition the flue gas is analysed continuously on its H2 content by means of a H2 analyser. In case of a deviation of the H2 content the ratio is immediately corrected.

MEA (Mono Ethanol Amine) Boiler and CO2 Stripper
The combustion is effected in a refractory lined reaction chamber. This chamber is equipped with an electrical ignition, an ignition burner and an automatic self-controlling UV-flame monitoring device. The hot flue gas, generated by this process releases its heat by means of a heating register to the MEA-boiler for the generation of pressure-less regeneration-strip-steam. The flue gas leaves the MEA-boiler at approx. 300 °C and is routed to the CO-converter. The CO2 enriched MEA lye coming from the CO2 scrupper is removed in the CO2
stripper column.

CO Converter HT-1 and LT-2 The shift CO conversion in the reactor HT-1 and LT-2 takes place in present of steam, produced by burning of hydrocarbons. The reaction is effected at a temperature of 300 °C respectively 200 °C in the second LT-2 reactor.To achieve a reactor inlet temperature of 200 °C in the LT-2 reactor, the hot effluent HT-1 CO-convertgas will be cooled by quenching with condensate.

CO2 Scrubber A regenerative organic alkaline solution (MEA = Mono Ethanol Amine) is used as CO2 absorbent.
The loaded alkaline solution is routed to the desorption tower where the CO2 is removed by means of the strip-steam generated in the MEA-boiler.

 

Gas Drying

The “wet” HN protection gas is dried in a thermically regenerated two bed

adsorption plant. As drying agent molecular sieve is used. While drying takes place in the first vessel the second is regenerated at temperatures exceeding 200 °C. The dried HN protection gas is available for the customer.

 

Pictures

   

  

[Impression of a
protective Gas HN-GAS]

 

 

 

[enlarged view of a
protective gas HN-GAS]

  

 

Highlights

 

 Plants in operation for more than 
 20 years to full satisfaction of 
 the customers

 Several plants in operation at
 leading rolling mills in Europe

 

 On demand hydrogen content
 up to 15 % by vol.

 

 

 

 

 Applications

 

  Mahler’s HNX protective gas
  generators can cut the production
  cost considerably, e.g. in the
  following industrial applications

 Heat Treatment of steel in the
 metallurgical / steel industry
 (e.g. bright annealing)
 Float glass manufacturing