Method for producing liquid sulfur dioxide by using sulfur-containing flue gas

A liquid sulfur dioxide and flue gas technology, applied in sulfur dioxide/sulfurous acid, chemical instruments and methods, specific gas purification/separation, etc., can solve problems such as single product, reduce production costs, improve economic benefits, and do not produce secondary The effect of pollution

Inactive Publication Date: 2015-03-04
ASIA PACIFIC ENVIRONMENTAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Ammonia desulfurization is mainly a by-product of ammonium sulfate, and the product is single

Method used

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  • Method for producing liquid sulfur dioxide by using sulfur-containing flue gas
  • Method for producing liquid sulfur dioxide by using sulfur-containing flue gas
  • Method for producing liquid sulfur dioxide by using sulfur-containing flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a. The sulfur-containing flue gas (concentration of sulfur dioxide is 13210mg / Nm 3 ) is absorbed through ammonium sulfite solution (concentration is 254g / L) to obtain sulfur-containing absorption liquid; the concentration of sulfur dioxide in the absorbed sulfur-containing flue gas is 30mg / Nm 3 .

[0027] b. Decompose the sulfur-containing absorption solution by adding sulfuric acid with a concentration of 95% by volume to obtain acidolysis solution and SO containing water vapor 2 gas;

[0028] c, the SO containing water vapor 2 The gas is spray dried with sulfuric acid to SO 2 Gas water content≤0.2g / Nm 3 ; The amount of sulfuric acid spraying is 140m 3 / h. Removal of dry SO using nanofiber mist eliminators in drying 2 Acid mist brought by the gas process.

[0029] d. The dried SO 2 The gas is pressurized under the pressure condition of 0.25-0.7MPa, deoiled and liquefied to obtain liquid sulfur dioxide. The output is 116.14kg / h.

Embodiment 2

[0031] a. The sulfur-containing flue gas (concentration of sulfur dioxide is 14035mg / Nm 3 ) is absorbed through ammonium sulfite solution (concentration is 245g / L) to obtain sulfur-containing absorption liquid; the concentration of sulfur dioxide in the sulfur-containing flue gas after absorption is 35mg / Nm 3 .

[0032] b. Decompose the sulfur-containing absorption solution by adding sulfuric acid with a concentration of 90% by volume to obtain acidolysis solution and SO containing water vapor 2 gas;

[0033] c, the SO containing water vapor 2 The gas is spray dried with sulfuric acid to SO 2 Gas water content≤0.2g / Nm 3 ; The amount of sulfuric acid spraying is 160m 3 / h. Removal of dry SO using nanofiber mist eliminators in drying 2 Acid mist brought by the gas process.

[0034] d. The dried SO 2 The gas is pressurized under the pressure condition of 0.25-0.7MPa, deoiled and liquefied to obtain liquid sulfur dioxide. The output is 117.33kg / h.

Embodiment 3

[0036] a. The sulfur-containing flue gas (concentration of sulfur dioxide is 14655mg / Nm 3 ) is absorbed through ammonium sulfite solution (concentration is 251g / L) to obtain sulfur-containing absorption liquid; the concentration of sulfur dioxide in the sulfur-containing flue gas after absorption is 40mg / Nm 3 .

[0037] b. Decompose the sulfur-containing absorption solution by adding sulfuric acid with a concentration of 98.5% by volume to obtain acidolysis solution and SO containing water vapor 2 gas;

[0038] c, the SO containing water vapor 2 The gas is spray dried with sulfuric acid to SO 2 Gas water content≤0.2g / Nm 3 ; The amount of sulfuric acid spraying is 120m 3 / h. Removal of dry SO using nanofiber mist eliminators in drying 2 Acid mist brought by the gas process.

[0039] d. The dried SO 2 The gas is pressurized under the pressure condition of 0.25-0.7MPa, deoiled and liquefied to obtain liquid sulfur dioxide. The output is 115.67kg / h.

[0040] In the abov...

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Abstract

The invention relates to a method for producing liquid sulfur dioxide by using sulfur-containing flue gas and belongs to the technical field of chemical engineering and environment protection. The method comprises the following steps: a, absorbing the sulfur-containing flue gas by desulfurization absorption liquid to obtain a sulfur-containing absorption liquid; b, adding sulfuric acid into the sulfur-containing absorption liquid, and performing decomposition to obtain acidolysis liquid and SO2 gas containing steam; c, spraying and drying the SO2 gas containing the steam by using the sulfuric acid till the water content of the SO2 gas is smaller than or equal to 0.2 g / Nm<3>; d, pressurizing, de-oiling and liquefying the dried SO2 gas under the pressure condition of 0.25-0.7 MPa to obtain the liquid sulfur dioxide. The method has the benefits that a flue gas desulfurization byproduct is the liquid sulfur dioxide, so that the economic benefits of the flue gas are remarkably improved, and secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering and environmental protection, and in particular relates to a method for producing liquid sulfur dioxide by utilizing sulfur-containing flue gas. Background technique [0002] The huge amount of sulfur dioxide emissions in my country has caused serious pollution to the atmospheric environment, exceeding the self-purification capacity of the atmospheric environment in our country. The area with an annual precipitation pH value of less than 5.6 accounts for about 40% of the country's land area, causing huge economic losses and seriously affecting my country's ecological environment and people's health. SO 2 Emissions and the formation of acid rain mainly come from fields such as coal combustion, metallurgy, and chemical industry. [0003] With the development of technological economy and the deepening of the concept of circular economy, ammonia desulfurization technology highlights its ...

Claims

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Application Information

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IPC IPC(8): C01B17/50
CPCC01B17/60C01B2210/0009
Inventor 曾子平周锡飞
Owner ASIA PACIFIC ENVIRONMENTAL CORP
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