| 摘要 |
PURPOSE:To use effectively heat energy of fuel and to recover hydrochloric acid from waste liquor of hydrochloric acid, by keeping temperature of liquid through pressure control. CONSTITUTION:In recovery of hydrochloric acid from waste liquor of hydrochloric acid wherein the furnace 1 for thermal decomposition reaction is charged with the fuel 2, the air 3 and the waste liquor of hydrochloric acid 4, which are subjected to thermal decomposition reaction, an evolved hydrogen chloride-containing waste gas is sent to the vapor-liquid contact device 11 attached to the vapor-liquid separating column 10, blended with the waste liquor 4 of hydrochloric acid in a vapor-liquid state, concentration of the waste gas is reduced, the waste gas is sent from the vapor-liquid separating column to the hydrochloric acid absorbing column 20, and recovered as hydrochloric acid by the column, vapor-phase pressure of the vapor-liquid separating column 10 is regulated, vapor-phase temperature in the column 10 is controlled, and vapor-phase pressure of the furnace 1 for thermal decomposition reaction is adjusted by the pressure regulator 9 set between the furnace 1 for thermal decomposition reaction and the vapor-liquid separating column 10. Temperature of liquid is regulated by pressure control instead of existing regulation of temperature of liquid with cooling water, so waste heat energy is not used, and heat energy of fuel is effectively used. |
