The flue gas from the desulfurization chimney is yellow in color; the water discharged from the desulfurization circulation tank is also yellow, turning yellow-brown after sedimentation
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Our company uses rotary kilns as heat exchange equipment, with bituminous coal as the fuel (with a volatile matter content of around 35% on a dry basis and a sulfur content of around 0.30%). The flue gas first passes through primary and secondary cyclone dust collectors, then enters a bag filter for further dust removal. After that, it goes through a desulfurization tower (using calcium carbide sludge as the desulfurizing agent) to remove sulfur before being released into the atmosphere. At present, the main problems encountered are: 1. Yellow smoke is emitted from the tail end of the rotary kiln ； 2. The chimney sometimes emits yellow smoke ； 3. The effluent from the desulfurization circulation tank is yellow in color; it turns yellow-brown after being held in the sedimentation tank ； 4. There is a very strange smell near the desulfurization tower; (according to a colleague’s judgment) it is the smell of coal ash. I am seeking help from all of you here.
The water from our desulfurization circulation tank is also yellow; does anyone know the reason for this?
The typical desulfurization system is not operational, resulting in the direct emission of sulfur-containing flue gas.
A yellow color of the flue gas is usually caused by incomplete combustion of the boiler fuel; the darker the color of the flue gas, the more incomplete the combustion of the fuel. The sulfur content in your coal is only 0.3%, which classifies it as low-sulfur coal.
Our company uses rotary kilns as heat exchange equipment, with bituminous coal as the fuel (with a volatile matter content of around 35% on a dry basis and a sulfur content of around 0.30%). The flue gas first passes through primary and secondary cyclone dust collectors, then enters a bag filter for further dust removal. After that, it goes through a desulfurization tower (using calcium carbide sludge as the desulfurizing agent) to remove sulfur before being released into the atmosphere. Such a system is too complex, and its operating costs are high. By using carbon molecular vaporization combustion technology, the current problems can be solved, and operating costs can also be reduced. Based on the bituminous coal you provided (with a volatile matter content on a dry basis of around 35% and a sulfur content of around 0.30%), the cost of desulfurization can be reduced by over 90%.