Method for effectively restraining generation of sulfur trioxide and waste acid in smelting smoke

[0020] The method for suppressing the production of sulfur trioxide and polluted acid in the flue gas by adjusting the temperature of the flue gas, the specific steps are as follows:

[0021] After the smelting flue gas enters the ascending flue from the outlet of the smelting furnace, the cooling effect of the flue is weakened so that the temperature of the flue gas is in the range of 900-1300 ℃; when the flue gas enters the waste heat boiler, adjust the temperature of the cooling water of the waste heat boiler and the flow rate of circulating water to cool The method makes the flue gas temperature drop rapidly (cooling speed is 70-100 ℃ / s) to below 400 ℃.

[0022] The contents of sulfur dioxide and sulfur trioxide in flue gas were detected dynamically by gas chromatography.

[0023] After testing, almost no sulfur trioxide can be detected in the flue gas, the content of sulfur dioxide is 38-39%, the content of nitrogen is 60-61.8%, and the incidence of sulfur trioxide is 0.3%

[0025] The method for suppressing the production of sulfur trioxide and polluted acid in the flue gas by controlling the air leakage of the flue gas, the specific steps are as follows:

[0026] Seal the entire flue, especially install a sealing device at the exhaust port of the furnace body, reduce the gap between the flue mask and the exhaust port, properly adjust the negative pressure of the flue, and adopt a conventional cooling method for the waste heat boiler;

[0027] Use the air flow meter for production to detect the air leakage, control the air leakage through the above adjustment method, and use the gas chromatograph to detect the content of sulfur dioxide, sulfur trioxide and sulfuric acid in the flue gas.

[0028] After testing, when the controlled air leakage rate is 47.6 v / v % of the total flue gas volume, the maximum content of sulfur trioxide is 9.15 % and the maximum content of sulfuric acid is 10 % during the process of flue gas temperature reduction; When the

[0030] The method for suppressing the production of sulfur trioxide and polluted acid in flue gas by controlling the water content and sulfate content of materials, the specific steps are as follows:

[0031] By adjusting the materials to air, dry, and reduce artificial water spraying, etc., reduce the water content of the materials to 3-8 wt%, and the sulfate content to 5 wt%.

[0032] The water content of the material determines the water vapor content of the flue gas. The lower the water content of the material, the lower the water vapor content; the sulfate decomposes during the smelting process to produce sulfur trioxide, and the lower the sulfate content, the lower the amount of sulfur trioxide produced.

[0033] The waste heat boiler flue gas cooling adopts the conventional cooling method, does not control the air leakage of the flue gas, and uses the gas chromatograph to detect the content of sulfur dioxide, sulfur trioxide and sulfuric acid in the flue gas.

[0034] Dry