atb flender loher H2-DV-27-A Helical gear reducers H2

Flender/Flender Gear Units/Helical gear reducers H2

and the cost of replacement of an HFMS are very high, but maintenance costsare lower than those for PSA system. This method may also be used for scrubbing byrecirculating air from the CA rooms ( since water vapor and CO 2permeate the mem- brane walls. Ammonia cracking is another type of 2control system. High-temperature anhy- drous ammonia (NH gas is reacted with air from the CA room. The reaction involves the splitting of the NH 3into hydrogen and inert 2gas. The hydrogen then reacts with the 2present in the air to form water vapor. The air returning to the room consists of N2and water vapor but is free of CO 2, carbon monoxide (CO), and hydrocarbons. The returning airstream is cooled before it returns to the room. The efciency of the combustion process is determined by the combustion temperature and the ammonia/oxygen ratio (. The operating costs are high and the use of ammonia gas can be extremely dangeroussince the gas is toxic at concentrations of 0.5% by volume in air (. In addition to thesedisadvantages, processes of ammonia manufacture require lot of fossil fuel energy simplyto combine the inert atmospheric 2with hydrogen. Hypobaric storage involves storing the produce at reduced pressure, usually between 1 and 8 mm of mercury. The air in the reinforced, airtight refrigerated room is continu- ally removed by vacuum pump (. When the pressure in the room reaches the desiredlevel, air is allowed to enter the room at rate that creates one to four air changes perhour (. This system provides relatively easy manipulation of 2concentration and relative humidity. CO 2, 2H4, and other volatile gases of metabolism are also removed, making it possible to store together commodities that are otherwise not normally compati-ble in storage (. The system can also be used as vacuum cooler. However, there are some major difculties with hypobaric storage (. The cost associated with providing room with acceptable structural strength for the required v