The furnace temperature of the incinerator affects sulfur dioxide emissions
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I. Background This year, two sulfur units (using the pre-alkaline washing process) were put back into operation after maintenance. After acidic gas was introduced, sulfur dioxide levels in the flue gas increased as the temperature of the incinerator rose. As the temperature of the incinerator drops, the sulfur dioxide levels in the flue gas also decrease, which prevents my incinerator from reaching a higher temperature. II. Analysis: The furnace temperature in the incinerator is primarily influenced by natural gas and residual hydrogen. Both sets of devices use the same natural gas and hydrogen. Three days after the commissioning of the first sulfur plant, the sulfur dioxide content in the flue gas ceased to change in response to variations in furnace temperature; the reason for this is not clear. I am currently operating the second sulfur unit, and the sulfur dioxide in the flue gas is still related to the furnace temperature. I’m very troubled by this abnormal situation right now; I can’t proceed with the work. Have any experts encountered this before?
I. Cause Analysis 1. During the heating process of the furnace, if there is an adequate supply of oxygen, the complete combustion of natural gas and hydrogen will lead to an increase in the temperature inside the furnace; this can also facilitate the complete oxidation of sulfur, resulting in more sulfur dioxide being produced. 2. As the temperature drops, incomplete combustion or insufficient oxidation of residual sulfur occurs, resulting in a decrease in sulfur dioxide. II. Possible solutions 1. Adjust the oxygen supply to ensure an appropriate ratio of oxygen to natural gas and hydrogen, thereby controlling complete combustion without excess. 2. Check the combustion efficiency of the incinerator to ensure thorough oxidation of sulfur. 3. Monitor and adjust the furnace temperature to prevent excessively high or low temperatures from affecting the amount of sulfur dioxide produced. .
Hasn’t anyone encountered it? {:9004:}
This post was last edited by qqgd on 2024-12-10 at 16:00. Such phenomena may need to be considered from several different aspects: 1. The situation with the first set of devices – examine the composition of the flue gas: is there excess oxygen? Is there an excess of reducing gases, or in other words, combustion gases (natural gas and hydrogen)? Is there a significant excess of oxygen in the flue gas, and is the acid dew point of the acidic flue gas also low? 2. For the second set of devices, the composition of the flue gas is examined: as the temperature rises, does an obvious increase in excess oxygen occur as well? This requires accurate measurement The remaining sulfides form sulfur dioxide in the flue gas. However, at certain temperatures, there is a chemical equilibrium between sulfur dioxide, sulfur trioxide, and oxygen. As the temperature rises, sulfur trioxide tends to decompose into sulfur dioxide and oxygen; thus, the following equilibrium exists: 2SO2 + O2 ⇌ 2SO3. This is a reaction governed by thermodynamic equilibrium, and it is dependent on temperature. This balance is similar to the balance between carbon monoxide, carbon dioxide, and oxygen in the blast furnace gas used in iron production. Appropriately reducing the flue gas temperature (making sure it does not drop below the acid dew point) may help with flue gas desulfurization (i.e., keeping sulfur dioxide concentrations at lower levels). Do not describe such technological phenomena qualitatively; try to use test data to express or explain them instead.