The obtained ammonia water may be used for cultivating plants.

An ammonia water absorption refrigerating device utilizing exhaust heat of tail gas, comprises an ammonia water solution circulation loop and an ammonia circulation loop.

To form the (active) mist, an aqueous solution of a reagent able to react chemically with the toxic components and to form water-soluble reaction products, preferably a metal hydroxide, ammonia and/or ammonia water, is sprayed into the gas.

Ammonia solution, also known as ammonium hydroxide, ammonia water, ammonical liquor, ammonia liquor, aqua ammonia, aqueous ammonia, or simply ammonia, is a solution of ammonia in water.

The ammonia gas having been used for cooling is absorbed into water to obtain ammonia water, which is reused as a supply material.

Ammonia liquor or a crystalline hydroxide of an alkaline or earth alkaline metal that is dissolved in water or spent washing liquor can be used as the washing liquor.

Ammonia water (up to 25 % NH3), ammonia precursor compounds or urea solution is injected into the combustion gas to reduce NO to N2.

Since pH control is vital for optimal growth, ammonia water is added to the tank as necessary.

  An alkali is added to the aqueous solution resulting from the separation of the precipitate, and the resultant mixture is distilled to obtain ammonia water and the fluoride of an alkaline earth metal.

Said processing parameters comprise temperature, copper concentration, pH value, specific gravity, ammonia water content, chloride content and circulating rate etc.