Biomass boiler flue gas

1、 Overview of Industrial Boiler Flue Gas Treatment

In order to meet the needs of the new environmental protection situation and solve the current problems of boiler exhaust gas carrying fog droplets and fine particles, based on the feasibility of the dehazing mechanism of wet electrostatic precipitators (mists), and taking into account the successful cases of domestic wet electrostatic precipitators (mists) applied to deep purification of their exhaust gas, it is proposed to use efficient wet electrostatic precipitators (mists) to deeply purify and treat harmful substances such as fog droplets and fine particles carried by the boiler exhaust gas of the construction unit.

Reason for the formation of acid mist and droplets: After wet desulfurization of boiler exhaust gas, the moisture content in the flue gas quickly reaches saturation. The fine dust and saturated water carried in the flue gas become the condensation core of the droplets. The part of water vapor that exceeds saturation begins to condense into small droplets in space, forming acid mist and droplets. Because smoke also contains components such as sulfur dioxide. After adiabatic humidification, the temperature of the neutralized flue gas decreases, generating acid mist and droplets.

Reason for aerosol formation: The saturated wet flue gas after desulfurization carries a large number of solid particles, with fine dust particles smaller than 5 μ m suspended in the gas, forming "aerosols" in a wet gas state. From a mechanistic analysis, mechanical defoggers utilize the inertial force of slurry droplets for separation. When the droplet size becomes small to a certain extent, the mechanical defogger loses its separation ability. The minimum particle size that it can generally remove is 50 μ m, and droplets with a particle size less than 10 μ m and fine dust cannot be removed. The transparency of the smoke plume emitted from wet chimneys is poor, and the smoke plume appears white, resulting in the problem of "big white smoke" landscape pollution.

2、 Working mechanism and technical characteristics of wet electric defogger

The wet electric demister equipment is composed of a cathode wire and an anode tube (precipitation electrode). Its working principle is that the flue gas passes through a high-voltage electric field, which charges the smoke and fog droplets in the flue gas, forming charged ions. The charged ions move towards the electrode with opposite charges, discharge after reaching the electrode, and form neutral dust and mist particles, which deposit on the electrode, aggregate and fall, and are removed.

In order to ensure the stable movement of charged ions in the same direction in an electric field, it is necessary to convert alternating current to direct current. Therefore, the electric defogger equipment must be equipped with a set of rectification and transformation power supply devices.

In order to improve the dust removal and defogging efficiency of electric demister equipment, a certain strength of electric field must be formed, which requires that the anode tube of the electric demister equipment must have a voltage and current greater than the corona inception voltage, and the cathode line must have a certain line current intensity.

The particle size and conductivity of dust and fog are also important factors determining the efficiency of dust removal and fog. The main particle size range of conductive fiberglass electric demister equipment for dust removal and fog is between 0.01-100um, and the specific resistance range of smoke and dust is 3 × 106-1010 ohms Centimeters.

In order to ensure the dust and mist removal efficiency of the electric demister equipment, it is necessary to regularly clean the sedimentation electrode of the electric demister equipment with water.

3、 Technical characteristics of wet electric defogger

3.2.1. Low resistance and low energy consumption;

3.2.2. Gas suspended particles and mist can be removed within the range of 0.01-100um, and are widely applicable to smoke and dust;

3.2.3. High dust removal and defogging efficiency, generally ranging from 95-99.5%, with a maximum of 99.9%;

3.2.3. Effective treatment can be carried out for low temperature, humid saturated gas dust and mist;

3.2.4. Easy to operate and capable of implementing self-control.

4、 Main equipment and equipment characteristics and performance

The honeycomb type conductive fiberglass electric defogger produced by our company is a high-efficiency purification and defogging equipment made of high-grade corrosion-resistant meta phenylene resin as the matrix, carbon fiber, and glass fiber as reinforcement materials, and extruded through a special mold using extrusion molding technology. Its characteristics are as follows:

1. Good conductivity and high defogging efficiency. The efficiency of electric fog can reach over 99.00%.

2. Strong corrosion resistance. Capable of withstanding corrosion from various dilute acid, alkali, and salt media.

3. Good flame retardancy. After testing by a national professional testing agency, the flame retardant level has reached V0 level. Therefore, even if an arc is generated in the electric field, it will not ignite the precipitation electrode tube.

4. Lightweight, high strength, stable external dimensions, and long service life of the equipment.

5. Compact structure. The honeycomb structure makes both the inner and outer surfaces of each polar tube become precipitation polar surfaces. There is no dead zone between the polar tubes. Therefore, for treating smoke of the same scale, it has a small volume and occupies less space.

6. The resistance of the working smoke is low, the airflow distribution is uniform, and the cathode wire remains stable, thus achieving the best effect and high defogging efficiency.