Venturi tube, also known as Venturi tube, whose main function is to induce secondary air flow. When the filter bag is cleaned, high-speed air flows through the Venturi tube and induces secondary air that is 5-8 times larger than the compressed air to enter the filter bag, causing the filter bag to rapidly expand. Due to the reverse effect of the air flow, it accumulates in the filter bag. Dust from the filter bag falls off.
After the gas has been finely dusted, there is still a part of the dust suspended in the gas. Since the remaining dust particles are finer and cannot be moistened by the washing water, they must be separated from the gas by a powerful external force to form large particles. The purpose of fine washing is called fine dusting.
Fine dust removal equipment: Venturi, electrostatic precipitators and washing machines.
Due to the complex structure of electrostatic precipitators and washing machines and their large power consumption, they have not been adopted. Venturi is widely used as a fine dust removal equipment for blast furnace gas. As long as there is enough pressure, the venturi tube can completely clean the gas dust to 20mg/m3 (standard state) below. The venturi’s structure is shown in Figure 8-6. It consists of a contraction tube, a throat and a dilation tube. In general, the right two spray pipes are arranged in front of the shrink tube, and a nozzle is provided in the center of the shrink tube. Venturi’s dust removal principle is the same as that of a Venturi Venturi tube, except that the flow rate of gas through the throat is greater, and the disturbance of water and gas is also more severe. Therefore, finer particles of dust can be moistened and coalesced with the gas. Separation to achieve the purpose of fine dust.