| 摘要 |
<p>PURPOSE:To reduce operating cost by utilizing cooling water effectively at high temp. which has been heat-exchanged in a primary cooler. CONSTITUTION:An apparatus for producing ammonium sulfate is constituted of a primary cooler 2 for cooling waste gas by exchanging heat between waste gas 3 discharged from a coke oven 1 and cooling water 4, an absorption tower 5 for absorbing ammonia from the cooled waste gas to generate mother liquor of ammonium sulfate 6, a first heater 9 for heating the generated mother liquor of ammonium sulfate 6, a first evaporating kettle 10 for concentrating the heated mother liquor 6, a second heater 11 for heating the concentrated mother liquor 6, and a second evaporating kettle 13 for concentrating the heated concentrated mother liquor 6 and generating crystalline ammonium sulfate. Heat exchangers 20, 21 for exchanging heat between a part of the mother liquor 6 generated in the absorption tower 5 and Li bromide 28 are installed by connecting in parallel to the first heater 9. The cooling water 4 at high temp. which has exchanged heat in the primary cooler 2 is utilized for a heat source for generating steam to be absorbed by the Li bromide 28.</p> |
