System and method for preparing sodium sulfite by recycling active coke desulfurization rich gas

Abstract

The invention provides a system and a method for preparing sodium sulfite by recycling active coke desulfurization rich gas, wherein the system comprises: a pretreatment system for purifying, coolingand gas-solid separation of regenerated gas; a reaction recovery system which comprises a reaction unit and a recovery unit, wherein the reaction unit of the reaction recovery system is connected withthe gas outlet of the pretreatment system and used for reaction synthesis and recovery of sodium sulfite; an evaporation and concentration system, which is used for circularly evaporating and concentrating the sodium sulfite slurry generated by the reaction unit, wherein the evaporated and concentrated sodium sulfite slurry enters from an inlet of the recovery unit for recovery treatment; and a tail gas treatment system which is used for absorbing sulfur dioxide and dust in the tail gas. The method comprises the following steps: regenerated gas pretreatment; synthesis, evaporative concentration, and recovery of a product; and tail gas treatment. The system disclosed by the invention is low in energy consumption, high in purity, suitable for continuous production requirements, good in absorption and purification effect, low in water consumption, low in SO2 loss rate and high in system independence.

Description

technical field [0001] The invention belongs to the technical field of dry activated coke desulfurization and denitrification gas-rich resource utilization in the environmental protection industry, and in particular relates to a system and method for producing sodium sulfite through active coke desulfurization and gas-rich resource utilization. Background technique [0002] At present, my country's iron and steel enterprises, air pollutant control measures can be roughly summarized into three categories: 1. Raw material control, basic conditions for flue gas emission reduction; 2. Sintering process control, effective means for flue gas emission reduction; 3. Flue gas end Governance, the ultimate means and ultimate guarantee of flue gas treatment. Among the above three control measures, people tend to pay more attention to the treatment of the end of flue gas. At present, the terminal treatment of sintering flue gas mainly includes the integration of activated coke desulfuriz...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a system and method for producing sodium sulfite from activated coke desulfurization and rich gas resources, so as to solve the problem of low utilization rate of sintering flue gas in the current iron and steel production process, unable to recycle polluted flue gas, resulting in waste of resources

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