Mother liquor deamination process and equipment for soda production through thermal method

Abstract

The invention discloses a mother liquor deamination process and equipment for soda production through a thermal method. The equipment comprises a furnace gas condenser, a mother liquor deamination tower and a tail gas rectifying tower. According to the mother liquor deamination process and equipment for the soda production through the thermal method, preheating is conducted on deamination mother liquor by means of high-temperature furnace gas of a calcining section, the self cooling purpose of the furnace gas is achieved simultaneously, energy is utilized reasonably, cooling water consumption of the furnace gas is greatly reduced, deamination tail gas exhausted through the mother liquor deamination tower enters the tail gas rectifying tower to conduct NH3 and CO2 concentration, when one ton of sodium carbonate deamination liquor equivalent is produced, 400 kg of water can be reduced, equivalent evaporation of the evaporation process is reduced, and the ammonia content of a thin solution at the tower bottom is lower than 5 ppm. According to the mother liquor deamination process and equipment for the soda production through the thermal method, by means of energy consumption structure analysis and optimal design of processes, energy consumption in the technical process is optimized, and the comprehensive energy consumption is reduced by 20 percent.

Description

technical field [0001] The invention belongs to the technical field of chemical equipment, and in particular relates to a process and equipment for deammonization of mother liquor used in thermal combined alkali production. Background technique [0002] Deamination of mother liquor and calcination are two important sections of thermal combined alkali production. At present, the typical thermal combined alkali deamination process is as follows: use the high-temperature deamination tail gas leaving the deamination tower to exchange heat with the filtered mother liquor entering the deamination tower, and the preheated mother liquor enters the upper part of the mother liquor deamination tower, and the liquid is automatically Up-down flow and countercurrent contact with the steam generated by the reboiler to remove free ammonia and CO from the mother liquor 2 , the deammonization gas after preheating the mother liquor is condensed by the tower top condenser and then sent to the ...

AI Technical Summary

Problems solved by technology

In the production of existing factories and in the design of typical process flow, the cooling of high-temperature furnace gas is usually carried out by cooling water for indirect cooling. About 300,000 kcal of heat per ton of soda ash needs to be removed, and this process consumes a large amount of cooling water.

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