Method for removing fine particles in dust-contained gas
A fine particle and gas removal technology, which is applied in chemical instruments and methods, solid separation, electrostatic effect separation, etc., can solve the problems of equipment cost and particle utilization weakness, and achieve the effect of compact and reasonable system structure and enhanced removal effect
Inactive Publication Date: 2010-03-10
TSINGHUA UNIV
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Problems solved by technology
At present, the wet electrostatic precipitators that have been industrialized all use a single plate to apply water film technology, such as Chinese patents 02222513.7, 00215471.4, etc. The collected products are all slurry formed by particles and water, and there are disadvantages in terms of equipment cost and particle utilization.
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[0026] Example: the distance between the polar plate and the polar line is 75mm, the voltage is a DC power supply of 16KV, the velocity of the dusty gas is 0.6m / s, and the dust content is 1.55g / m 3 , using a water film to form a thermal swimming field, the average temperature of the plate is 50°C lower than the average temperature of the airflow, and the removal efficiency for fine particles with a particle size of less than 0.5 μm is higher than 40% of the removal efficiency when only the electrostatic dust removal field is applied.
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The invention relates to a method for removing fine particles in a dust-contained gas, which belongs to the technical field of dust removal. The method is characterized by comprising the following steps: leading the dust-contained gas to pass through at least one stage of dry type static dust removing field to remove most part of rough particles; discharging the removed particles in a dry form from a dust discharge opening of the static dust removing field at the lower part; and leading the gas discharged from the dry type static dust removing field to enter a final stage statics and thermophoresis synergy field to remove the fine particles. The final stage statics and thermophoresis synergy field reduces the temperature of an electrode plate in such a way that a water film is applied to the surface of the electrode plate or a cooling medium is charged into the electrode plate so that the average temperature of the electrode plate is at least 50 DEG C lower than the average temperatureof the gas. Compared with the prior art, the method can effectively remove the fine particles which are difficult to remove by the common dust removing equipment; in addition, the inventionhas reasonable design and compact structure and is beneficial for large-scale application.
Description
technical field [0001] The invention relates to a method for removing fine particles in gas, belonging to the technical field of dust removal. Background technique [0002] A large number of gaseous pollutants and particulate matter produced by human activities are threatening the basic substance that human beings rely on for survival - clean air. Inhalable particulate matter (PM 10 ) especially fine particulate matter (PM 2.5 ) pollution has become a prominent atmospheric environmental problem, and has increasingly attracted great attention from all countries in the world. It has been recognized that atmospheric particulate matter (especially fine particulate matter) is the main cause of the increase in human mortality. At the same time, atmospheric particulate matter is also the main cause of major air pollution problems such as reduced atmospheric visibility, acid rain, global climate change, and ozone layer destruction. Controlling the pollution of fine particles is ...
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IPC IPC(8): B03C3/00B03C3/017
Inventor 由长福
Owner TSINGHUA UNIV