System and method for producing hydrogen by utilizing sulfur-containing flue gas of boiler

Abstract

The invention relates to a system and method for producing hydrogen by utilizing sulfur-containing flue gas of a boiler. Sulfur dioxide-containing flue gas subjected to denitration and dust removal from a boiler flue is pressurized by a flue gas booster fan and then enters a sulfurous acid preparation device to react to generate a sulfurous acid solution, and gases such as nitrogen, carbon dioxide and the like with relatively low solubility in the flue gas enter a gas discharge device; the sulfurous acid solution enters an iodine-hydrogen separation device through a sulfurous acid pump to absorb heat and raise the temperature; the sulfurous acid solution enters a hydrogen iodide preparation device to produce hydrogen iodide gas and a sulfuric acid solution, and the hydrogen iodide gas enters a hydrogen preparation device through a hydrogen iodide fan; and hydrogen is discharged into a hydrogen collection tank through the iodine-hydrogen separation device. The raw material for hydrogen production comes from polluted waste gas discharged by a boiler, sulfur dioxide can be obtained without high-temperature pyrolysis of sulfuric acid, and the system and method have the characteristics of environment protection and low hydrogen production cost.

Description

technical field [0001] The invention belongs to the technical field of hydrogen preparation, and in particular relates to a system and method for producing hydrogen by utilizing boiler sulfur-containing flue gas. Background technique [0002] Hydrogen production by sulfur-iodide cycle high-temperature hydrolysis requires pyrolysis of sulfuric acid to sulfur dioxide at a high temperature above 850°C, water, sulfur dioxide and iodine at a temperature of about 100°C to produce hydrogen iodide, and hydrogen iodide at a temperature of 300°C to decompose into iodine and hydrogen. The current problems and difficulties in hydrogen production by high-temperature hydrolysis and combustion of sulfur-containing coal lie in: [0003] (1) The high temperature of 850°C required to pyrolyze sulfuric acid into sulfur dioxide is difficult to meet. [0004] (2) The economy of hydrogen production by pyrolysis of sulfuric acid is poor. [0005] (3) The boiler burns sulfur-containing coal to p...

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Problems solved by technology

[0003] (1) The high temperature of 850°C required to pyrolyze sulfuric acid into sulfur dioxide is difficult to meet

[0004] (2) The economy of hydrogen production by pyrolysis of sulfuric acid is poor

[0005] (3) The boiler burns sulfur-containing coal to produce sulfur dioxide, which is discharged into the atmosphere and causes air pollution. Desulfurization measures must be taken

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