Dry Dust Remover Technology
一、I Flue gas waste-heat recovery low-low temperature saving coal ESP technology
Working Principle
It is the technology to place the heat exchanger (MGGH) after boiler air pre-heater and before the inlet of electric precipitator. By leading condensate water to MGGH, we can make it heat exchanging with hot flue gas from boiler. By doing this, the running temperature can be dropped to around 90 ～ 100℃. It can maximize the property of flue gas treatment and recycling condensate water by rising its temperature.
Technique flow chart
Major component:
Heat transfer ( finned coil pipe module), shell, the water system, soot blower system, controlling system and so on.
Features of technology
Maximizing the collection efficiency. By using the three-electric-field dust remover, we can make its efficiency equal to those four-electric field dust remover, or even five-electric-filed dust remover. Combined with the high-frequency electric source, flocculator, movable electrode, WESP and other technoloties, it can meet the newest emission standard.
Lower the coal consumption. According to the temperature variation, evenly, this technology can save about 1.5～3 g/kwh. ( every 15℃ can save about 1g/kwh coal )
Partial SO3 can be removed. The flue gas temperature inside the dust remover placed in this system has dropped below dew point. Therefore, the dust concentration in the flue gas is very high and total surface area of dust is increased. And this provides a favourable condition for the condensation of sulfuric acid mist.
二、Roasting electrode type electrostatic precipitator
Working principle
It has a movable electrode that is composed by movable dust collection pole plate, fixed discharge electrode and rotary soot cleaning brush. This is a dust remover that can move the plate and dust to a ash bucket when the thickness of the collected dust are not capable to formed the back corona. Then the plate will be cleaned by a rotary brush and by doing this, the plate can be remain to a clean state.
Major component :
Inlet smoke box, movable plate electrode, movable electrode deashing device, pole actuating device, cathode system, cathode rapping apparatus, shell, outlet smoke box and so on.
Schematic diagram and features of structure
Mechanism of dust collection is completely same as normal electric precipitator
The plate can be remained cleaning all the time; avoiding the phenomenon of back corona; securing the efficiency of dust remover
Giving up the traditional vibrating dedusting and introduced deashing brush. By doing this, high resistivity dust and sticky dust can be cleaned and minimized re-entrain dust by placing the deashing brush at a clean area.
It can keep the anode plate stay clean forever and avoiding back corona. Effectively solved the problem of collecting high resistance ash. Minimized re-entrain dust and reduced the emission on the outlet smoke box
Lower the influence of coal and ahs composition to dedusting property. Increasing the adaptation of ESP to various kinds of coal, especially, to the sticky dust and high resistance ash.
Miniaturization of the electric precipitator is specially suited to the reconstruction of ageing unit’s electric precipitator. On many occasions, we just need to reconstruct the last electric field to a movable electrode.
Comparing with ba-type dust remover, it is less resistance loss and maintenance cost. Under the same condition, one-time investment will be a little higher than normal ESP. However, the maintenance cost is almost same and the operation cost is much lower.