Dry desulfurization and urea solution direct injection denitrification device for flue gas of sintering machine

Abstract

A dry desulfurization and urea solution direct injection denitrification device for flue gas of a sintering machine comprises the sintering machine, an air bellow, an online flue gas monitoring control device, an electric air inlet valve, a reaction tower, a bag-type dust collector, a fan and a chimney. The device is characterized in that the sintering machine is sequentially connected with the air bellow, the online flue gas monitoring control device, the electric air inlet valve, the reaction tower, the bag-type dust collector, the fan and the chimney, an electric flow regulating valve is connected between the air bellow and the online flue gas monitoring control device, the online flue gas monitoring control device is connected with a PLC (programmable logic controller) control box connected with a variable-frequency rotary feeder, the upper side of the variable-frequency rotary feeder is connected with an electronic screw scale connected with a discharger, the discharger is connected with a urea granule bin, and the lower side of the variable-frequency rotary feeder is connected with the upper side of a jet flow mixer. With the adoption of the device, harmful pollutants such as SO2, NOx, dioxin, heavy metals and the like in the flue gas of the sintering machine can be removed, up-to-standard emission of the flue gas is realized, and environmental pollution is avoided.

Description

technical field [0001] The invention relates to flue gas desulfurization and denitrification equipment, in particular to a sintering machine flue gas dry desulfurization urea solution direct injection denitrification device, which belongs to the field of environmental protection technology. Background technique [0002] At present, during the 1200°C high-temperature firing process of the coke powder and coal powder used in sintering production, the sulfur and nitrogen in the raw materials undergo a chemical reaction to form SO 2 , NOx enters the sintering flue gas, and the SO emitted from the sintering machine 2 , NOx accounted for domestic SO 2 , A large part of the total NOx emission is the emission source second only to thermal power plants. According to the analysis of sintering flue gas, it has the following characteristics: [0003] (1) The concentration of SO2 in the sintering flue gas changes very quickly and the concentration fluctuates greatly; [0004] (2) The ...

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Problems solved by technology

[0009] To sum up, the flue gas temperature of the sintering machine is relatively low, mostly between 100 and 150 °C, and the flue gas environment conditions are relatively harsh, such as high dust concentration, high oxygen content in the flue gas, and moisture content. Large amount, high concentration of heavy metals, etc., flue gas SO at the head of the sintering machine 2 The emission concentration reaches 2000~3000mg / Nm 3 , NOx concentration reaches 300~400mg / Nm 3 , causing serious pollution to the environment

[0010] In the existing technology, the denitrification process mainly uses ammonia water as the reducing agent, adopts manual feeding, and the degree of automation of the device is not high; then removes SO 2 Gas, and then filter the dust particles, where SO 2 The gas removal method adopts the wet process, and the above method has many disadvantages:

[0011] 1. The denitrification process mainly uses ammonia water as the reducing agent. This kind of medicament preparation device uses cold water to be heated to the set temperature by the heater, and then manually feeds and dissolves. The degree of automation of the device is not high, and it cannot meet the removal of large smoke volume The continuous demand for chemicals during nitrogen oxides causes a waste of manpower and material resources; there is no online flue gas monitoring and control device, and the dose of chemicals is randomly added, which cannot be monitored in real time and cannot ensure a good denitrification effect. The waste is serious and the operating cost is high;

[0012] 2. Wet desulfurization adopts the form of washing tower, which will produce waste water containing high concentration of inorganic chloride salts and heavy metals, resulting in secondary pollution. It needs to be equipped with a waste water treatment system, which has high investment costs and high operating costs.

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