Wet dust collection apparatus

Abstract

The invention discloses a wet dedusting device, which comprises an ultrasonic atomizer, which is used to spray fine water mist into the flue gas flow channel to form an ultrasonic atomization area; The downstream of the device is used to establish a sound field in the flue gas flow channel to form a sound wave condensation zone; the droplet catcher is arranged downstream of the acoustic wave generator according to the flow direction of the flue gas, and is used to capture the The dust-laden droplets that condense after the area and the acoustic coagulation area form a dust collection area. The device can significantly reduce the site occupation, overall cost and operating cost of the dust removal equipment after wet desulfurization, reduce the waste water discharge of wet dust removal, and also achieve ultra-clean discharge of the chimney; at the same time, because there is no high-voltage electrostatic equipment, the internal parts can be used Non-conductive, corrosion-resistant non-metallic material, no risk of operation with spark ignition.

Description

technical field [0001] The invention relates to the technical field of dedusting equipment, in particular to wet dedusting equipment for combined dedusting of discharged flue gas after wet desulfurization. Background technique [0002] In recent years, with the continuous growth of thermal power installed capacity and the increase in the total amount of pollutants discharged, great pressure has been placed on the atmospheric environment. It was officially implemented on January 1, 2012. [0003] With the promulgation of new standards, people's awareness of fine dust, acid mist, heavy metals and other pollutants harmful to the environment and health has further improved, and the country's emission standards for air pollutants will continue to increase, especially PM2.5. This kind of fine particulate matter, which is extremely harmful to human health, is bound to become the control index of the country's emission standards for air pollutants. However, the existing wet desulf...

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Problems solved by technology

[0006] First, although the problem of ultra-clean emission has been solved, no matter what kind of wet high-voltage electrostatic precipitator it is, it uses the electrostatic dust collection principle that the dust is charged and driven to the dust collection plate by electric field force, and its dust collection effect is Affected by the specific dust collection area and the flue gas wind speed, the larger the specific dust collection area, the lower the flue gas wind speed, and the higher the dust collection efficiency, but increasing the specific dust collection area and reducing the flue gas wind speed both make the body structure bulky , takes up more space, and the equipment cost is too high

[0007] Second, any kind of wet high-voltage electrostatic precipitator needs an expensive high-voltage electrostatic power supply and complex high-voltage power supply control equipment due to its dust collection principle. At the same time, it consumes a lot of power and has high operating costs.

[0008] Third, the horizontal metal plate wet electrostatic precipitator is highly corrosive due to the complex composition of the flue gas after wet desulfurization and entrained mist droplets. The internal parts, including the dust collector and discharge electrode, are made of stainless steel. The dust removal efficiency is high, but the equipment cost is further increased. In order to prevent the stainless steel metal plate from being corroded, it is necessary to continuously spray flushing water to form a water film on the components to achieve anti-corrosion and dust removal. The water consumption is huge.

Although part of the flushing water is recycled, due to the large water consumption, the recycling makes the water system equipment more complicated and the cost is higher, and the amount of wastewater discharged to desulfurization recovery is still too high, and it is often difficult to fully recycle

[0009] Fourth, although the horizontal non-metallic plate type or vertical non-metallic tube electrostatic precipitator solves a series of problems caused by the corrosion of the plate, because the plate is a non-metallic material, its conductivity is not good even though measures to enhance conductivity are adopted. It is still far inferior to the metal plate, so the electric field cannot obtain good volt-ampere characteristics, which affects the dust removal efficiency. To obtain the same dust removal efficiency as the metal plate, it is necessary to increase the specific dust accumulation area, and the equipment cost is not low It is better than the metal plate electrostatic precipitator and takes up more space

Moreover, the dust collection plate is made of non-metallic materials. Since the electrostatic dust collection process is easily accompanied by spark discharge, it is easy to cause ablation of the non-metal plate, and even cause fire and combustion, which has a high operational risk

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