Working principle of the steel bag dust collector:
Dust gas after entering ash hopper from tuyere, part of the condensation of coarse dust particles and dust, falling due to inertia effect directly, have the effect of dust in advance. The airflow into the ash hopper folding turn into housing, when through internal equipped with metal frame filter bag, dust were blocked at the outer surface of the filter bag. After purification, the gas into the upper part of the filter bag cleaning chamber to duct drainage. Dust precipitator is by chamber in turn, their application is determined by the controller is adjusted according to the process conditions. Reasonable soot cleaning procedures and ensure the soot cleaning cycle and life of filter bag type dust collector's effect. Clear grey controller with timing and resistance of two kinds of ash removal function, timing type ash removal is suitable for the working condition is relatively stable, such as conditions often change, adopts fixed resistance type dust soot cleaning cycle can be realized and the running resistance of best fit.
Dust collector is working, as filtering, the appearance of dust filter bag, filter resistance also increase. When reached set value, ash removal controller soot cleaning instructions, the filter bag dust removal of the surface outside down, and fell into the hopper, and then open the exhaust valve to restore the chamber filter. After proper time interval filter soot cleaning work again on to the next room.
Arrangement and steel plant dust of steel mill dust collector pipe pipe, cement dust collector pipe arrangement similar to that of main and follow the following principles: does not affect the process of production, installation convenient maintenance, for the user to save investment, reduce dust removal pipe network resistance, dust collector pipe should consider and the integration of production equipment, reasonable technological process.
(1) steel plant dust collector pipe layout should cooperate with the plant structure, less occupied space effectively, or hamper and convenient for installation and operation.
(2) steel plant dust dust collecting system of dust collection points shoulds not be too much, a dust collection system generally no more than 5. When the distance between the filter dust collection points or not between different parallel branch pipe resistance can still balance, the number of the precipitator dust collection point can be appropriately increased, but also should not be more than 10. Dust collection point number of filter dust collecting system, can adopt the big cross section of the manifold branch pipe connect the filter, and the resistance of the balance between each branch.
(3) to prevent dust deposition in the pipe mills filter, filter dust collecting pipe should try to avoid horizontal layout, especially the conveying of pulverized coal pipeline. Dust collector pipe and the horizontal plane Angle had better not be less than 55 °. Steel plant dust to dust concentration boy 5 g/m3 the pipeline, no explosion danger and tube flow velocity is more than 18 m/s, can also be horizontal layout. Due to all kinds of special steel filter, pipeline must be level, should try to shorten the length of the horizontal line, and set near the filter pipe elbow tee pipe fittings such as cleaning the hole or compressed air pipe joint, so that regular cleaning. Branch pipe from the top of the head or side connection.
(4) in order to adjust the steel plant dust air volume and the needs of the testing, should be on the dust hood export connecting pipe, dust collector and fan on the tube of import and export of the reserved hole. Measuring holes should be located in atmospheric stability on the straight pipe, as far as possible away from the elbow, tee and other special shape pipe, to reduce the eddy current effect on the determination results. Measurement don't drive in the upper part of the dust catcher duct hole position, so as not to affect the measurement result. Large steel mills bag filter dust collecting system can be set up according to the specific situation of online measuring air volume and air pressure, temperature and CO content analysis parameters of instrument.
Steel bag precipitator main features are:
1, the smoke volume is big, each producing 1 t of sinter produced about 4000 ~ 6000 m3 flue gas.
2, the flue gas temperature is higher, along with the change of operation condition, usually in the flue gas temperature of 150 ℃.
3, flue gas with dust.
4, moisture content. In order to improve the permeability of sinter mixture, must add the right amount of water in front of the sintering mixture into balls, so the moisture content of gas containing dust is bigger, according to the volume calculation, water content is about 10%.
5, containing corrosive gas. Blast furnace gas ignition and the mixture of sintering molding process, will produce a certain amount of SOx and NOx, they encounter after water to form acid, can cause corrosion of metal structure.
6, containing SO2 concentration is low, according to the different raw materials and fuel, is in commonly 1000 ~ 3000 mg/m3.
