Surface membrane coagulation technology and device for efficiently removing fire coal flying ash microspheres

Abstract

The invention relates to a surface membrane coagulation technology and a surface membrane coagulation device for removing fire coal flying ash microspheres. The device is composed of a pattern-plate-type atomizer, a flow rate meter, an ultrasonic wave driving power supply, an automatic temperature control device, a tracing heat pipeline, a condensing casing pipe, an electric heating water storage tank, a water pump and an electric deduster. According to the invention, high-temperature water is atomized into 10-20 micron single-diffusion liquid drop granules by utilizing ultrasonic waves; the saturation degree of flue gas is improved to in an ultra-saturated state, wherein the SR is greater than 1.3, and the temperature of the atomized liquid drop is controlled to be 80-90 DEG C; the temperature of liquid in the condensing casing pipe is controlled, so that the flue gas is cooled to 1-5 DEG C; steam in the flue gas is adsorbed to the outer surfaces of the microspheres by utilizing the high adsorption performance of the surfaces of the microspheres, and micro bulges on the surfaces of the microspheres are taken as cores, and 'sphere'-shaped coagulation is formed rapidly, so that the specific resistance of the microspheres is reduced by 1-2 dot products; the retention time of the atomized liquid drops in flue gas is controlled to be 300 milliseconds-1 second, and then the liquid drops are collected by an electrostatic deduster efficiently.

Description

1. Technical field [0001] The invention belongs to the field of air pollutant control, and in particular relates to a surface condensation film process and a device for efficiently removing fine particles of coal-fired fly ash glass beads. 2. Background technology [0002] At present, most domestic thermal power plants use coal-fired units. As the country has stricter and stricter requirements on the control of air pollutants, coal-fired units should gradually promote the emission indicators of coal-fired units to gas-fired units on the premise of ensuring low cost of coal-fired power generation and high thermal efficiency. Closer to become the development trend of environmental protection governance. However, one of the main difficulties in meeting the ultra-clean emission targets of coal-fired units lies in the control of fine particulate matter in the smoke and dust. At present, at the outlet of the electrostatic precipitator (ESP) in coal-fired power stations, the parti...

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Problems solved by technology

However, in order to meet the requirements of ultra-clean emission indicators for coal-fired units, one of the main difficulties lies in the control of fine particle emissions in smoke and dust.

At present, at the outlet of the electrostatic precipitator (ESP) in coal-fired power stations, the particle size of the discharged fine particles is between 0.1 and 3 μm, among which glass microparticles with a particle size of less than 2.5 μm account for more than 90% of the total number of escaped particles. The reason is attributed to Depending on factors such as boiler type, combustion method, furnace temperature, and coal chemical composition, as far as the drift beads discharged from the electric precipitator of coal-fired boilers are concerned, their mass concentration is between 3 and 20 mg / m 3 , the composition is SiO 2 and Al 2 o 3 Mainly, it has the characteristics of fine particles, smooth and hydrophobic surface, high electrical insulation strength, flame retardancy, heat resistance and heat insulation, etc., but because of its high specific resistance (100-120 °C, the specific resistance value is 5×10 11 ~10 12 Ω cm), the charging performance is poor, and the removal efficiency of conventional electrostatic precipitator technology is very limited

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