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System and method for comprehensive utilization of boiler sulfur-containing flue gas and fly ash

A boiler and fly ash technology, applied in chemical instruments and methods, aluminum-sulfur compounds, aluminum sulfate, etc., can solve the problems of high price, difficult to meet the high temperature of sulfuric acid, and poor economical production of hydrogen by pyrolysis of sulfuric acid.

Pending Publication Date: 2021-05-18
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology

[0006] (1) The high temperature of 850°C required to pyrolyze sulfuric acid is difficult to meet
[0007] (2) Sulfuric acid is a highly corrosive substance, and materials that can resist high temperature corrosion are very expensive
[0008] (3) The economy of hydrogen production by pyrolysis of sulfuric acid is poor

Method used

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  • System and method for comprehensive utilization of boiler sulfur-containing flue gas and fly ash

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Embodiment

[0058] The main proportion of the flue gas volume of a 600MW boiler is: nitrogen 80.4%, carbon dioxide 13.1%, oxygen 6.3%, sulfur dioxide 0.16%. Boiler fly ash contains 51% of silicon dioxide and 26% of aluminum oxide.

[0059] Using sulfur dioxide in boiler flue gas to produce hydrogen can produce 120,000 cubic meters of hydrogen, worth about 1.2 million yuan; 600 tons of aluminum sulfate, worth about 600,000 yuan; more than 800 tons of silicon dioxide, worth about 4 million yuan . The economic value is considerable. At the same time, it can reduce 120,000 cubic meters of carbon dioxide emissions produced by the desulfurization system due to the consumption of limestone, and the social benefits are considerable.

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Abstract

A system and method for comprehensive utilization of boiler sulfur-containing flue gas and fly ash are characterized in that a boiler flue outlet is connected to a Benzoic reaction device, the Benzoic reaction device is connected with a water supply device, a reactor exhaust device, an inlet of a sulfuric acid collection device and a hydrogen iodide decomposition device, the hydrogen iodide decomposition device is connected with an iodine recovery device, a hydrogen collection device, and a fourth inlet of the Benzoic reaction device, the iodine recovery device is connected with the iodine supply device, and an outlet of the iodine recovery device is connected with the Benzoic reaction device; the sulfuric acid collection device is connected with the aluminum sulfate preparation device, the aluminum sulfate preparation device is connected with an outlet of the boiler fly ash system and an inlet of the aluminum sulfate treatment device, and an outlet of the aluminum sulfate treatment device is connected with inlets of the aluminum sulfate storage device and the silicon dioxide treatment and storage device; and based on the system, sulfuric acid generated in the hydrogen production process is used for absorbing disulfur trioxide in the fly ash, meanwhile, silicon dioxide with high purity can be generated, aluminum sulfate and silicon dioxide with high additional value are formed, and waste substances are recycled.

Description

technical field [0001] The invention relates to the technical field of environmental protection and resource utilization of waste materials, in particular to a system and method for comprehensive utilization of boiler sulfur-containing flue gas and fly ash. Background technique [0002] Generally, the main components of boiler flue gas are nitrogen, carbon dioxide, sulfur dioxide, and water vapor. Sulfur dioxide in boiler flue gas is one of the main pollution sources of the atmosphere, and carbon dioxide is the main greenhouse gas. Reducing emissions of these two gases is a major issue facing electricity production. [0003] At present, most boiler flue gas desulfurization methods are to pass flue gas into calcium carbonate solution, and use calcium carbonate to react with sulfur dioxide to generate calcium sulfate and carbon dioxide. This desulfurization method removes sulfur dioxide in boiler flue gas, but increases greenhouse gas carbon dioxide emissions. [0004] Gener...

Claims

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Application Information

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IPC IPC(8): C01F7/74C01B33/18C01B3/04
CPCC01B3/04C01B33/18C01F7/743Y02E60/36
Inventor 马晓珑张寅胡杨张瑞祥王苏东刘峰
Owner XIAN THERMAL POWER RES INST CO LTD
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