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Prior to the glass flake anticorrosion construction of wet electrostatic precipitators, a detailed construction plan must be formulated as required, a safety agreement signed, and documents including material factory quality inspection reports, certificates of conformity, shipping lists and procurement contracts provided.

The glass flake anticorrosion construction procedures are as follows:

Sandblasting

Prior to sandblasting, impurities such as rust, oxide layers and oil stains shall be removed. Sandblasting shall be performed with quartz sand or iron ore using compressed air at a pressure of 6–8 kg/cm². The surface cleanliness after sandblasting shall meet or exceed the Sa2.5 standard specified in GB 8923-88, with a surface roughness of 50–80 μm. The ambient air humidity shall be < 85%. Areas without lining or with completed lining shall be protected to prevent damage from sandblasting.

Primer Coating

The primer shall be applied within 8 hours after sandblasting. The primer coating shall use uncolored vinyl ester resin, with curing agent added and thoroughly mixed in accordance with the specified ratio. Application shall be conducted with a roller to ensure uniform coating without missing spots or sagging.

First Glass Flake Layer Application

Glass flakes shall be mixed thoroughly with curing agent in the specified ratio. Application shall be performed using a trowel and roller to ensure uniform spreading. Simultaneously, lightly roll the surface with a roller dipped in a small amount of styrene to finish the coating, with a target average thickness of 1 mm.

Second Glass Flake Layer Application

Glass flakes shall be mixed thoroughly with curing agent and color paste in the specified ratio. Application shall be performed using a trowel and roller to ensure uniform spreading. Simultaneously, lightly roll the surface with a roller dipped in a small amount of styrene to finish the coating, with a target average thickness of 1 mm.

Inspection

• Spark test (6000 V/mm)
• Thickness test (≥ 2.0 mm)
• Visual inspection

Top Coating

The topcoat material shall be mixed thoroughly with curing agent in the specified ratio. Application shall be conducted with a roller to ensure uniform coating without missing spots or sagging.

Construction Procedures for Glass Flake Anticorrosion of Desulfurization Towers

The flue gas treated by the phosphorus chemical wet electrostatic precipitator is desulfurized flue gas and water vapor. The flue gas contains highly corrosive media such as sulfur, phosphorus, arsenic, and fluorine, and the operating temperature is below 90°C.

The girders and insulation boxes of the wet electrostatic precipitator that have been removed show severe corrosion as can be seen from the pictures.

The disassembled anode system and shell of the wet electrostatic precipitator

On-site hoisting and replacement of the anode system of the wet electrostatic demister

On-site of shell, insulation box and anode tube bundle for the maintenance project of wet electrostatic precipitator in phosphorus chemical industry

Operation of wet electrostatic precipitator for cyanuric acid tail gas treatment in Hubei. The cyanuric acid tail gas mainly consists of mono- or mixed flue gases of dichloroisocyanuric acid and trichloroisocyanuric acid, and the flue gas generally does not contain flammable and explosive gases or substances. The inlet flue gas flow rate (operating condition) of this wet electrostatic precipitator is ≤60,000 m³/h, the inlet flue gas temperature is <60℃, the air flow direction is bottom-in and top-out, the negative pressure operating wind pressure is -3600Pa, and the dust removal efficiency is ≥90%.

Wet electrostatic precipitator for cyanuric acid tail gas treatment

The wet electrostatic precipitator for the waste incineration exhaust gas treatment project of Hebei Weimei Environmental Protection in Hainan has recently started commissioning and operation.

Hebei Weimei Environmental Protection is responsible for the process design, manufacturing, packaging and transportation, assembly, installation supervision, quality assurance, commissioning supervision, training and other technical services of the wet electrostatic demister equipment in the EPC general contracting project of the rotary kiln incineration system of the hazardous waste disposal center project.

Trial operation of the wet electrostatic precipitator for the Hainan waste incineration project

 The flue gas volume treated by the wet electrostatic demister of this project (under standard conditions) is 43,270 nm ³/h. The flue gas processing volume (under working conditions) is 57,716 m³/h, the temperature is ≤72℃, and the inlet pressure for negative pressure operation is -5300Pa. The inlet dust concentration should be less than 20mg/Nm³, and the outlet dust concentration should be less than 5mg/Nm³. The dust removal efficiency should be over 80%, and the droplet removal efficiency should be greater than 90%. The material of the anode tube should be conductive fiberglass reinforced plastic. The cathode wire material should be 2205 duplex stainless steel. The shell steel structure, platform railings, ladders and other materials are made of Q235B material.

The 8# calcium chloride flue gas treatment wet electrostatic precipitators produced by our company has started commissioning and is ready to be put into use.

The flue gas volume of this equipment is 50,000 m³/h, the flue gas temperature is ≤ 50℃, the flue gas does not contain flammable and explosive gases, the air flow direction is bottom-in and top-out type, the wet electrostatic precipitator body is independently installed on the steel frame, and the equipment operates under positive pressure.

Operation of Wet Electrostatic Demister for Calcium Chloride Flue Gas Treatment

This is already the fourth calcium chloride tail gas treatment equipment produced by our company for customers. Customers in need are welcome to call for consultation.

The bag dust collector of the flue gas pretreatment device for the yellow phosphorus tail gas 100t/h high-temperature and high-pressure gas-fired boiler (540℃, 9.8MPa) operates stably.

This device uses sodium carbonate (Na?CO?) as the flue gas treatment agent, and a bag dust collector is used for dust removal. The flue gas pretreatment device consists of four parts: a raw material bin, a feeding system, a mixing and drying system, and a bag dust collector. In this project, the content of sulfur, phosphorus and other acidic substances in the flue gas is relatively high. The flue gas pretreatment device needs to fully consider the corrosion problem caused by sulfur, phosphorus and other acidic substances. All flues in the flue gas pretreatment device are made of materials not lower than 2205 and 316L.

Stable operation of the bag dust collector in the pretreatment device for comprehensive utilization of yellow phosphorus tail gas

The flue gas pretreatment device consists of four parts: a raw material bin, a feeding system, a mixing and drying system, and a bag dust collector.

Recently, the sodium metabisulfite wet electrostatic precipitator installed and commissioned by our company has started commissioning. Below is a demonstration of the operation effect of sodium bicarbonate and calcium chloride tail gas treatment on a sunny day:

Operation effect of wet electrostatic precipitator for waste gas treatment in sodium bicarbonate production line on sunny days

Operation effect of wet electrostatic precipitator for calcium chloride waste gas treatment on sunny days

Installation of wet electrostatic precipitator for sodium bicarbonate exhaust gas treatment is in progress.

The wet electrostatic precipitator for baking soda tail gas treatment has been installed and put into operation.

Operating status of the wet electrostatic precipitator

The wet electrostatic precipitator equipment for the exhaust gas upgrading and renovation of the calcium chloride granulation production line has been manufactured, installed, and has officially entered the commissioning and operation phase. The flue gas flow rate of the electrostatic demister in this production line is 40000 m³/h, the inlet flue gas temperature is less than 60℃, and the airflow direction is bottom-in and top-out.

Operation of Wet Electrostatic Precipitator in Calcium Chloride Granulation Production Line

The main process route adopted by the wet electrostatic precipitator  for tail gas treatment in hazardous waste projects: quenching tower + two-stage wet scrubbing for acid removal + wet electrostatic precipitator + induced draft fan + chimney. Different technical routes may be adopted for different projects in different regions.

Operation of Wet Electrostatic Precipitator for Flue Gas Treatment in Hazardous Waste Incineration Project