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System and method for preparing methane by utilizing sulfur-containing flue gas of boiler

A technology for methane production and boiler flue, which is applied in the production of hydrogen, hydrocarbon production from carbon oxides, organic chemistry, etc., to achieve the effects of environmental protection, low cost of hydrogen production, and emission reduction

Pending Publication Date: 2021-05-28
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology

[0007] The purpose of the present invention is to provide a system and method for producing methane from boiler sulfur-containing flue gas in view of the existing problems of high-temperature hydrolysis hydrogen production and sulfur-containing coal combustion

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  • System and method for preparing methane by utilizing sulfur-containing flue gas of boiler

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Embodiment

[0063] The volume ratio of a 1000MW boiler flue gas is: nitrogen 73.28%, carbon dioxide 12.67%, water vapor 8.37%, oxygen 5.4%, sulfur dioxide 0.1%. Utilizing the technology proposed in the present invention, the unit can extract more than 220 tons of sulfur dioxide, 19,000 tons of carbon dioxide and 70,000 m3 of hydrogen every day from the flue gas under full load conditions. 3 , to prepare 340 tons of sulfuric acid. 27 tons of methanol can be synthesized by using the produced hydrogen and extracted carbon dioxide.

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Abstract

The invention discloses a system and a method for preparing methane by utilizing sulfur-containing flue gas of a boiler. The system comprises a boiler flue (1), a flue gas spraying and cooling device (2), a primary low-temperature scrubber (3) and a Benzoic reactor (6), wherein the boiler flue (1) is a flue after denitration and dust removal of a boiler, an outlet of the boiler flue (1) is connected to an inlet of the flue gas spray cooling device (2), an outlet of the flue gas spray cooling device (2) is connected to an inlet of the first-stage low-temperature scrubber (3), and a first outlet of the first-stage low-temperature scrubber (3) is connected to a first inlet of the raw reactor (6). According to the method, sulfur dioxide can be obtained without high-temperature pyrolysis of sulfuric acid, and the difficulty of high-temperature pyrolysis hydrogen production is solved; the energy consumption in the hydrogen production process is low, the flue gas emission temperature of the boiler is suitable for the hydrogen iodide generation temperature, additional measures are not needed, and the temperature required by hydrogen iodide decomposition is very easy to obtain in a power plant.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a system and method for producing methane by utilizing sulfur-containing flue gas of a boiler. Background technique [0002] Sulfur dioxide in boiler flue gas is one of the main sources of air pollution, and carbon dioxide is the main greenhouse gas. Reducing emissions of these two gases is a major issue facing electricity production. [0003] Hydrogen production by sulfur-iodide cycle high-temperature hydrolysis requires a high temperature above 850°C to pyrolyze sulfuric acid into sulfur dioxide. Water, sulfur dioxide and iodine produce hydrogen iodide at room temperature, and hydrogen iodide decomposes into iodine and hydrogen at a temperature above 300°C. The difficulty in realizing this process lies in: [0004] (1) The high temperature of 850°C required for sulfuric acid pyrolysis is difficult to meet; [0005] (2) Sulfuric acid is a highly c...

Claims

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Application Information

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IPC IPC(8): C07C9/04C07C1/12C01B3/04C01B7/13
CPCC07C1/12C01B3/04C01B7/135C07C9/04Y02E60/36
Inventor 马晓珑张寅胡杨张瑞祥王苏东
Owner XIAN THERMAL POWER RES INST CO LTD
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