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

A boiler flue and flue gas technology, applied in chemical instruments and methods, ammonia compounds, sulfur compounds, etc., can solve the problems of difficult to meet the high temperature of sulfuric acid, poor economy and high price of hydrogen production by pyrolysis of sulfuric acid, and achieve the cost of hydrogen production less, beneficial to environmental protection, and high economic value

Pending Publication Date: 2021-05-14
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] (1) The high temperature of 850°C required for sulfuric acid pyrolysis is difficult to meet;
[0005] (2) Sulfuric acid is a highly corrosive substance, and materials capable of high-temperature corrosion resistance are very expensive;
[0006] (3) The economy of hydrogen production by pyrolysis of sulfuric acid is poor

Method used

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

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Embodiment

[0059] Example data

[0060] Flue gas from a 1000MW boiler mainly includes 73.28% nitrogen, 12.67% carbon dioxide, 8.37% water vapor, 5.4% oxygen, and 0.1% sulfur dioxide by volume.

[0061] The flue gas coming out of the spray cooling device 2 is cooled to below -95°C in the first-stage low-temperature scrubber 3. Since the melting point of sulfur dioxide is -72.4°C, the sulfur dioxide in the flue gas is solidified at this time. 3 separated into the Bunsen reactor 6; the sulfur dioxide produced is about 9500kg / h, and theoretically 77000m2 of hydrogen can be produced 3 / d, worth about 770,000 yuan; can produce 340t / d of high-purity sulfuric acid, worth about 170,000 yuan.

[0062] The sulfur dioxide-removed flue gas cooled by the primary low-temperature scrubber 3 to below -95°C continues to cool down to below -120°C in the secondary low-temperature scrubber 4. Since the melting point of carbon dioxide is -78.5°C, the flue gas in the flue gas The carbon dioxide solidifies in...

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Abstract

The invention discloses a system and method for preparing ammonia gas by utilizing sulfur-containing flue gas of a boiler. A flue of the boiler is connected with a flue gas spraying and cooling device, and the flue gas spraying and cooling device is connected with a primary low-temperature washer; the primary low-temperature washer is connected with a Bunsen reactor, the Bunsen reactor is connected with an inlet of a liquid separator, the liquid separator is connected with a hydrogen iodide treatment device, the hydrogen iodide treatment device is connected with a hydrogen iodide decomposer, the hydrogen iodide decomposer is connected with the Bunsen reactor, and the Bunsen reactor is connected with a water supply device; the hydrogen iodide decomposer is connected with a hydrogen storage device; and the primary low-temperature washer is connected with a secondary low-temperature washer, the secondary low-temperature washer is connected with an exhaust gas recovery device and a carbon dioxide storage device, the exhaust gas recovery device is connected with an ammonia gas production device, and the ammonia gas production device is connected with a hydrogen storage device and an ammonia water storage device. The flue gas containing sulfur dioxide after denitration and dust removal passes through the system to generate ammonia gas, a raw material for hydrogen production comes from polluted waste gas discharged by the boiler, the hydrogen production cost is low, and environmental protection is facilitated.

Description

technical field [0001] The invention belongs to the technical field of ammonia gas preparation, and in particular relates to a system and method for producing ammonia gas by utilizing sulfur-containing flue gas of a boiler. Background technique [0002] The main components of general boiler flue gas are nitrogen, carbon dioxide, sulfur dioxide, and water vapor. 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%. 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. When the sulfur dioxide, carbon dioxide, and water vapor in the boiler flue gas are recovered, the remaining gases in the flue gas are only nitrogen and oxygen. After the sulfur dioxide, carbon dioxide, and water vapor in the flue gas of a 1000MW boiler are recovered,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/04C01B17/80C01B7/14
CPCC01C1/0405C01B17/80C01B7/14Y02E60/36
Inventor 马晓珑
Owner XIAN THERMAL POWER RES INST CO LTD
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