The wet dust collector is very refreshing after the rain in the natural world. This is due to the collision, separation and washing of raindrops and dust in the atmosphere. The wet dust collector for asphalt concrete mixing equipment is also a device for purifying flue gas by using droplets to collect soot by contacting water with dusty flue gas. The domestic wet dust collectors used in asphalt mixing equipment include water bath type, spray type and venturi. The water bath type and spray type wet type dust collector are relatively simple type, and can also obtain certain dust removal effect, but the effect is not obvious; the venturi wet type dust removal efficiency is very high, and the dust removal efficiency of 0.5Lm can reach 99%. The structure of the Venturi wet scrubber, which consists of a venturi scrubber and a mist eliminator (gas-liquid separator).
The bag type dust remover acts as a secondary dust removal device of the system to filter out the dust in the flue gas, further improving the dust removal efficiency. The dust collection effect of the bag filter is a comprehensive effect: including screening, grid, inertial collision, interception, diffusion and electrostatic attraction. The dusty airflow is different from the airflow direction due to the action of molecular thermal motion during the movement. Irregular Brownian motion, when the dust passes through the pores of the filter cloth, the distance between the pores of the filter cloth is less than the free travel of the thermal motion of the gas molecules, so that the dust collides with the fibers of the filter cloth and adheres to the gap between the filter cloths, thereby The dust is separated from the gas. When the new filter cloth starts to use, the dust removal effect is poor. After the porous original dust layer is formed on the new filter cloth, the above-mentioned effects occurring in the dust layer are used to capture the subsequent dust, thereby achieving a very high dust removal effect. However, when the powder layer reaches a certain thickness, the flow of the airflow is hindered, so it is necessary to clean the dust in time to restore the above effects. The differential pressure gauge on the bag filter is used to control the flow rate of the flue gas so that the filter bag is always in optimal dust removal. The filter bag is the main component of the bag filter. Because the temperature of the filter flue gas is high and the bag is working at this temperature for a long time, this requires the filter bag material to withstand higher temperatures. The work of the bag filter is generally required. The temperature is 120 ° C ~ 180 ° C, the temperature is too high, the filter bag will be burnt, the temperature is too low, the water vapor in the flue gas is easy to dew, especially the SO2 gas in the flue gas is easy to form acid dew, accelerate the dust collector bag and components Corrosion.
The bag air inlet mode of the bag filter generally adopts the lower air inlet filter mode. When the wind enters the wind, the coarse grain dust can directly sink into the ash bucket, generally only the dust contact filter bag of less than 3Lm, which can reduce the wear of the filter bag. And can extend the cleaning interval. At present, the bag-type dust collectors used in domestic asphalt concrete mixing equipment have different structures, but their working principles are roughly the same. The main difference is the cleaning method, such as pulse blowing, fan blowing and atmospheric back blowing. The working process is that the flue gas enters the dust collector box under the suction of the fan, and the clean gas filtered by the filter bag is sent to the chimney by the fan. This arrangement reduces dust wear on the fan and extends the life of the fan.
During work, the dusty flue gas is separated into coarse dust particles by the primary cyclone dust collector and then enters the bag filter box body. Under the interception of the baffle plate, the flow is dispersed and separately enters the bag from the outside of each filter bag. The filter bag skeleton can prevent the filter. The bag is sucked by the negative pressure, and the fine dust in the flue gas is trapped and adhered to the outside of the filter bag by the filter bag filtering, collision, hooking, diffusion and other effects, and the clean gas rises from the bag to the upper part of the box and is sucked and discharged by the fan. . When the dust adheres to the filter bag to a certain thickness, the performance of the dust collector filter decreases, and the differential pressure gauge indicates that the pressure difference increases. At this time, the controller sends a signal, and the pulse valve starts to work, that is, the compressed air passes through the pulse valve to the blow pipe. The high-pressure air is injected backward from the filter bag and the flue gas is reversed. Under the action of the surrounding air induced by the venturi, the filter bag generates vibration and vibration, and the dust on the filter bag falls to the bottom of the box, and the dust is transported to the box by the screw conveyor. outer. The filter bags in the box are arranged in multiple rows, each row has a pulse valve control, and each row is cleaned in sequence during operation. Since each injection time is very short, 0.1 to 0.15 s each time, there is almost no influence on the amount of filtered gas.
Economic High Speed Edm Small Hole Drilling Machine
Economic High Speed Edm Small Hole Drilling Machine,Economic Edm Small Hole Drilling Machine,High Speed Edm Small Hole Drilling Machine,Economic High Speed Small Hole Drilling Machine
Taizhou Jiangzhou CNC Machine Tool Manufacturing Co.,Ltd , https://www.machinetzjz.com