Sintering flue gas desulfurization combined coking coal gas deamination cycling technology and cycling system

Abstract

The invention relates to a sintering flue gas desulfurization combined coking coal gas deamination circulation cycling technology, which comprises the following steps: (1) removing sulfur dioxide in the sintering flue gas using ammonium sulfite solution as desulfurization agent to generate ammonium bisulfite solution; (2) remove ammonia in the coking coal gas using the ammonium bisulfite solution obtained in the step (1) as deamination agent to obtain ammonium sulfite solution, using part of the ammonium sulfite solution as desulfurization agent in step (2), and oxidizing other ammonium sulfite solution into ammonium sulfate solution; (3) evaporating the ammonium sulfate solution, crystallizing, separating and drying to obtain the ammonium sulfate product. A sintering flue gas desulfurization combined coking coal gas deamination cycling system comprise a sintering flue gas desulfurization system, a coking coal gas deamination system and a ammonium sulfate preparation system. The invention removes ammonia in the coking coal gas efficiently while removing SO2 from sintering flue gas, reduces the raw material cost of desulfurization and deamination at the same time.

Description

(1) Technical field [0001] The invention relates to a combined flue gas desulfurization and coal gas deammonification technology, in particular to a sintering flue gas desulfurization combined coke oven gas deammonization circulation process and a circulation system. (2) Background technology [0002] Energy conservation and emission reduction is one of the key points of the current government's macro-control. For example, the government has determined the goal of reducing energy consumption per unit of GDP by about 20% and reducing the discharge of major pollutants by 10% during the "Eleventh Five-Year Plan" period. However, the goals set at the beginning of the year were not achieved in 2006 Energy saving and emission reduction goals. In the first quarter of 2007, high-energy-consuming industries rose again. The added value of six high-energy-consuming industries, including electric power, iron and steel, non-ferrous metals, building materials, petroleum processing, and ch...

AI Technical Summary

Problems solved by technology

[0007]1) Washing ammonia method: producing 18% concentrated ammonia water, which consumes a lot of energy;

[0008]2) Ammonium phosphate method: the production of anhydrous ammonia requires 20MPa medium-pressure steam, and the investment is huge;

Images