Wind turbine tower cylinder coating production line conveying equipment.

Transportation methods can be chosen as a single or multiple combination. It is recommended to use rail platform trolleys with roller supports.

Process flow of wind turbine tower cylinder coating production line

Shot blasting → Flange galvanizing and painting (primer) → Intermediate coating → Topcoat → Drying

No	The Process	Time/min	Task Mode	Requirement	温度
1	Primer Spraying	120	Automatic	Manual	10
2	Drying	60-120	Automatic	Hot Air	35-55
3	Topcoat Spraying	90-100	Automatic	Manual	10
4	Drying	60	Automatic	Hot Air	35-55

Inside the paint drying room, a dry paint mist recovery and filtration system is utilized for workpiece spraying. The VOCs exhaust treatment equipment has been approved by local environmental protection authorities, and online monitoring devices are installed. After spraying, the workpieces are dried on-site using heating.

The paint drying room consists of the chamber, front-end gantry-type air supply, interior lighting, rear-end gantry-type exhaust partition, air supply unit, paint mist separation unit, and electrical control system.

Spray Painting

Spray Painting
Supply Air	Air Extraction Conditions:	Workshop Ventilation:
	Temperature Control	During paint spraying operations: Natural ventilation in summer; 3-9℃ in winter.
	Humidity	During drying operations: Temperature maintained between 40-65℃, with the same environmental humidity.
	Cleanliness	Utilization of dual-stage filtration (G4, G600).
Exhaust Air	Paint Mist Treatment	Dry filtration method (using paint mist felt).
	Exhaust Gas Treatment	Activated carbon adsorption and catalytic combustion.
	Exhaust Gas Emission	Emission through a chimney stack exceeding 15 meters in height.
Illumination	≥600LUX
Fire Safety	Combustible Gas Detector
Equipment Noise	≤75dB

Principle of Operation During Painting

During painting, the supply air valve and exhaust air valve are in the open position. First, fresh air passes through the fresh air filter for filtration. With the action of the supply fan, the airflow enters the entrance of the static pressure chamber and undergoes preliminary pressure equalization through the guide plate. When the airflow inside the static pressure chamber becomes uniform and exceeds the initial resistance of the high-efficiency filter cotton, it enters the roller coating room in a laminar flow manner. In the roller coating chamber, air containing paint mist passes through the bottom filter cotton and filters out the paint mist. Then, it undergoes adsorption by activated carbon to react with organic gases in the exhaust gas, ultimately achieving absorption. After the air reaches the standard, it is discharged into the atmosphere. The discharged gas complies with the “Comprehensive Emission Standards for Air Pollutants” (GB16297-1996).

Working Principle During Drying

It operates on the principle of upper supply air and lower return air, forming a hot air circulation system. During drying, the fresh air valve is in a semi-closed state, and the exhaust air valve is closed. The circulation air valve at the bottom of the supply fan is open. During drying, the circulating air is heated through the heat exchange device in the supply/heating system. The design temperature for drying is 0~60±5°C, with natural gas as the energy source. The hot air is supplied from the upper part and returned from the lower part. During the drying process of the workpiece, organic solvents remaining in the workpiece paint film continuously evaporate. To ensure that the concentration of organic solvents in the drying chamber is below the lower explosive limit and to maintain safe operation of the drying chamber, a certain amount of fresh air needs to be supplemented into the circulating hot air, while a certain amount of high-concentration waste gas needs to be discharged. The drying chamber is equipped with temperature sensors to display temperatures at various points, and it is equipped with an automatic temperature control device to keep temperature fluctuations within ±5°C.

Wind turbine tower cylinder organic waste gas treatment equipment

Roller paint waste gas → Paint mist filtration → Dry paint mist filtration + activated carbon adsorption → System fan → Emission                                                                            

Activated carbon regeneration

This organic waste gas purification device adopts multiple activated carbon beds and 1 catalytic decomposition bed configuration. The processing air volume of each activated carbon bed is 20000 or 30000m3/h. All activated carbon beds share one catalytic decomposition bed, and regeneration is carried out in turns when not in operation.

Top 6 Characteristics of Wind Turbine Tower Cylinder Coating Production Line

• To ensure the purification efficiency and service life of the activated carbon adsorption bed, it is determined to set up a primary paint mist filter before the activated carbon adsorption bed. The existing exhaust fan unit’s filter box can be utilized, with its internal structure modified to a VQ pretreatment system, which can save the usage of filter cotton and reduce the number of replacements.
• The design specification standards of the activated carbon adsorption bed are combined with the existing size of the exhaust fan unit to place as much activated carbon as possible, increasing the adsorption saturation period of the activated carbon, meeting the required filtering air velocity in the design specification, reducing the number of periodic desorption cycles, and improving the service life of the activated carbon.
• The catalytic incinerator is equipped with flame arrestors, fire dampers, etc., and controlled by PLC to achieve interlocking control with various electrical systems. It is also interlocked with the control system of the original paint spray booth. When a fault occurs, an alarm prompt is issued. The overall adsorption bed is equipped with a nitrogen fire suppression system to further avoid safety hazards caused by fires.
• During desorption of the catalytic combustion regeneration system, internal circulation is adopted. The desorbed hot gas and decomposed exhaust gas are recycled through heat exchange, and are only emitted after desorption is completed. A concentration detection device is installed in the hot air duct after exhaust gas decomposition to ensure that the hot air after desorption is clean thermal air. It does not cause secondary pollution to the activated carbon during circulation to the desorption of the adsorption bed, greatly improving the utilization of heat and reducing the loss of heating energy.
• High iodine value activated carbon is selected to ensure the adsorption effect of activated carbon while improving its adsorption efficiency and service life. Activated carbon with an iodine value ≥1000 is chosen as the concentrating medium for honeycomb activated carbon.
• All fans are equipped with noise reduction spaces and soundproof facilities, with noise controlled to ≤80 decibels.

Wind tower industry coating production line case

Wind power tower coating production line equipment list

List of spray and drying equipment

No	Item	Specification
One	Painting and Drying System
1、	Chamber System
（1）	Chamber Frame	HS
（2）	Color Steel Plate and Edge Wrapping	HS 100mm rock wool board
（3）	Static Pressure Chamber	HS
（4）	Electrically Operated Lifting Gate	HS
（5）	Safety Door	HS
2、	Air Supply System
（1）	Supply Air Fan	B4-82-6.3E/15kw
（2）	Air Heating Unit
（3）	Transition Dampers	1000×1200mm
（4）	Supply Air Ducts and Supports	δ1.2mm hot rolled galvanized sheet
（5）	Return Air Ducts and Supports
（6）	Steel Platform
3、	Heating System	JT-21R-300
（1）	Natural Gas Burner (including pressure regulating valve and hoses)	RS50
（2）	Heat Exchanger	JT-TJR-50/310S stainless steel plate
4、	Exhaust System	JT-22-600
（1）	Exhaust Fan	B4-72-12C -75kw
（2）	Dampers
（3）	Exhaust Ducts	δ1.2mm hot rolled galvanized sheet
（4）	Exhaust Noise Reduction Space	50mm rock wool color plate and frame
（5）	Exhaust Flexible Connection
（6）	Dampers and Piping
（7）	Chimney (including inspection platform, ladder, lightning rod)	1.2mm
5、	Air Filtration System
（1）	Pre-filter	G4
（2）	High-efficiency Filter Cotton	G-600
（3）	Pre-filter Bracket
6、	Paint Mist Filtration System
（1）	Paint Mist Filter Cotton	PA-50
（2）	Bracket	1000×1000mm
7、	Lighting System	18W/root*4
8、	Waste Gas Treatment System	See exhaust gas treatment system
9、	Electrical Components	Main components Schneider
10、	Combustible Gas Concentration Alarm System	1 pallet 4
11、	Control System	Siemens PLC
（1）	Control Box
（2）	Electrical Components	PLC, frequency converter, contactor, thermal relay protector, etc.
（3）	Wires and Cables	internationality
（4）	Cable Trays	standard
（5）	Auxiliary Materials

Activated carbon adsorption + catalytic combustion equipment

No	Item	Specification
One	Activated carbon waste gas treatment + catalytic combustion regeneration system	JT-110-650
1、	Activated carbon adsorption system
	Pre-treatment and activated carbon adsorption bed	JT-112-200
2、	Catalytic combustion desorption system
	Catalytic combustion furnace	JT-RCO90 (including desorption fan, cooling air fan)
	Exhaust ducts	Galvanized sheet
	System internal pipelines	Galvanized sheet + rock wool insulation layer
3、	Control system	Siemens PLC, Schneider electrical components

Spare parts

No	Item	Specification
1	Primary efficiency filter	G4
2	Precision filter cotton	G600，15 ㎡/Set
3	Secondary paint mist filter cotton	F7

Consumable parts

No	Item	Specification
1	Primary efficiency filter	G4
2	Secondary paint mist filter cotton	F7

Advantages of wind turbine blade coating production line components

All components can be customized (such as size, material, brand, craftsmanship, function, etc.)

Spray drying integrated room body

Main materials of the chamber:

The inner and outer wall panels of the chamber are made of galvanized steel plates with a thickness of δ0.5mm. The middle is filled with rock wool insulation layer, with a thickness of δ100mm and a density of 180kg/m³. This configuration ensures that the temperature of the outer wall panel does not exceed 5℃ above room temperature, the heat transfer coefficient is not greater than 0.38Kcal/㎡.h.℃, and the average sound insulation volume is not less than 21.5R (dB). The chamber has the advantages of aesthetics, excellent sealing effect, good thermal insulation, and excellent impact resistance. The columns of the chamber are made of structural steel, which undergo sandblasting treatment, followed by priming and painting. They exhibit strong rust resistance and weather resistance, with a salt spray resistance of more than 500 hours. The strength, stability, thermal insulation, sealing, impact resistance, and seismic resistance of the chamber meet national or industry standards.

Gate

The gate adopts an electric flexible lifting gate made of welded and stamped steel or aluminum alloy profiles. It is corrosion-resistant, salt-resistant, and UV-resistant. The comprehensive accuracy of the track is <3mm. Each entrance and exit of the chamber is equipped with one set of gates, sealed on all sides, and all tracks and door curtains are equipped with rubber seals, ensuring good sealing. The opening and closing speed of the gate is 6-15m/min (adjustable), and it has strong wind resistance (≤12 levels) for large areas (800-1500m²). Safety measures include low-voltage 24VDC control, infrared safety protection (or light curtain), flashing warning lights on the door curtain during operation, and pressure airbags (some of which are optional accessories). The control system consists of Siemens programmable controllers and Delta variable frequency drives or servo controllers.

Safety doors

Safety doors are installed longitudinally on the chamber to open outward and equipped with riot emergency lights for convenient entry and exit of personnel and evacuation in emergencies. The size of the safety door (width × height) is 800×1900mm. The safety door is equipped with a mechanical pressure lock and automatic door closer. When the pressure inside the chamber exceeds 100Pa, the pedestrian door automatically opens outward to release pressure, serving as a pressure relief function. Depending on the length of the roller coating and drying chamber, 1-3 sets of safety doors are installed on one side of the chamber.

The supply air/heating system

The supply air/heating system is designed to control the airspeed according to the safety regulations for coating operations specified in GB14444-2006 <Safety Regulations for Coating Operations>. Following industrial coating requirements, the spray booth is designed with a slight negative pressure, where the exhaust air volume is slightly greater than the supply air volume by 3-5%. This design helps prevent external dust from entering the work area.

Exhaust system

The exhaust system is equipped with one set of B4-72 explosion-proof centrifugal fan unit, with both fan and motor being explosion-proof. The fan base is constructed using channel steel and angle steel industrial profiles welded into a frame. The exhaust ducts are made of high-quality A1.2mm galvanized steel sheet with snap joints, eliminating the need for welding and ensuring the ducts remain deformation-free. Damping or elastic reducers are installed at the bottom of the fan to reduce vibrations. Additionally, we have designed a noise reduction chamber for the fan to ensure that the system noise is controlled below 75DBA. The size of the exhaust chimney is determined based on the airflow velocity and the concentration of harmful substances emitted, and it is reinforced with a wind-resistant structure during installation.

Painting system

The painting system consists of manual high-pressure airless spray guns from GRACO, USA, for use in the paint booth or with painting robots. Customers can customize their setup according to their needs.

Paint mist filtration system

The paint mist filtration system employs a dry filtration device with two stages of filtration. The filtration grades are box-type filters and F7. Differential pressure transmitters are installed before and after the filters to ensure the normal, safe, and stable operation of the waste gas treatment system.

Box-type filter: The box-type filter employs a maze design, utilizing centrifugal principles to ensure better paint mist filtration. Its first and second layers use glass fiber flame-retardant filter materials with high filtration and purification efficiency, ensuring no secondary pollution and possessing a high dust holding capacity. The third and fourth layers utilize high-efficiency non-woven fabric materials to ensure even higher dust filtration efficiency. After purification by the dust treatment device, the dust concentration in the exhaust gas is ≤ 0.04 mg/Nm3. The dust filter material is installed in a drawer-type manner, making replacement convenient and quick.

F7 filter bag: The F7 filter bag consists of a high-efficiency filter material made of organic synthetic fibers and microfibers forming a non-woven fabric with a gradually increasing fiber structure. It achieves an average capture efficiency of over 99%, with a temperature resistance of up to 90°C. The filter adopts a modular design for easy combination, installation, and disassembly, ensuring practicality. The filter frame and floor adopt a fully welded structure to ensure no leakage or air leakage. All exhaust gases pass through the filter bag, achieving a paint mist capture efficiency of over 99%.

Waste Gas Treatment Equipment

During paint spraying operations, the emitted waste gas needs to be treated to meet the comprehensive emission standards for air pollutants specified in GB16297-1996. This solution utilizes an activated carbon system combined with RCO (Regenerative Catalytic Oxidizer) combustion. It utilizes the adsorption characteristics of activated carbon’s numerous micropores to adsorb organic waste gas, capable of treating low-concentration, low-temperature, hydrocarbon-containing waste gas. Solvents can be recovered and reused, achieving a purification efficiency of up to 90-95%. Activated carbon is a non-polar adsorbent with hydrophobic and organic-affinity properties, capable of adsorbing most organic gases such as benzene, ketones, alcohols, hydrocarbons, and odorous substances. After reaching adsorption saturation, it can be regenerated by hot air desorption for reuse.

Activated Carbon

Activated carbon is primarily used for the purification of various organic waste gases with low concentration and high airflow, including benzene, toluene, xylene, phenols, esters, aldehydes, and other organic gases, as well as foul-smelling gases. Jiutong activated carbon selects specially shaped honeycomb activated carbon with high microporosity and high specific surface area as the adsorption material. Its density is 8-10 times greater than that of granular activated carbon fibers, offering advantages such as large adsorption capacity (up to 25% of the total weight of activated carbon before regeneration), low resistance, fast adsorption rate, low operating costs, and long service life. The purified gas fully meets environmental emission requirements.

Catalytic Decomposition Bed

In the honeycomb ceramic catalytic decomposition bed, organic waste gases pass through a layer of catalyst where HC molecules and O2 molecules are adsorbed and activated on the catalyst surface. They then rapidly and completely oxidize and decompose into harmless carbon dioxide and water vapor at relatively low temperatures (200-300°C), while releasing heat. This entire process does not cause secondary pollution. The purification efficiency of catalytic decomposition is generally above 98%, and since the reaction temperature is low, NOx generation is absent. By using high-quality noble metal palladium and platinum as catalyst carriers, the catalytic decomposition rate can exceed 99%. The catalyst exhibits high specific surface area, high reaction speed, long service life, low decomposition temperature, low resistance, short preheating time for desorption, low energy consumption, high mechanical strength, wear resistance, heat resistance, good catalytic activity, and thermal stability.

Wind power tower coating production line program standard

The standard proposal for the wind turbine tower coating production line complies with national, industry, and local standards, ensuring that the entire production line is efficient, stable, safe, and environmentally friendly.

National Standards / Industry Standards / Local Standards	No
“Surface Corrosion Grade and Rust Removal Grade of Steel Before Coating”	GB8923-88
“Workshop Air Dust Hygiene Standard”	GB103328-10333-89
“Pre-coating Treatment Process Safety and Ventilation Purification in Coating Operations Safety Regulations”	GB7692-1999
“Safety Standards”	GB2894-1996
“Industrial Enterprise Protective Cover Safety Requirements”	GB8196-87
“Low Voltage Distribution Design Specifications”	GB50054-95
“Safety Standards for Climbing Ladder Platforms and Railings”	GB4053-83
“Coating Operation Safety Regulations, Safety and Ventilation Purification in Painting Process”	GB6514-1995
“Coating Operation Safety Regulations, Occupational Safety and Health”	GB7691－87
“Industrial Enterprise Noise Control Design Specifications”	GBJ87－85
“Safety Sign Standards”	GB2894－1996
“Industrial Enterprise Lighting Design Standards”	GB50034－92
“Industrial Machinery and Electrical Part 1: General Technology”	GB/T52226.1－1996
“General Technical Conditions for Industrial Machinery and Electrical Equipment”	GB/T522611-96
“Noise Standards in the Industrial Sector”	GB12348-90
“Comprehensive Emission Standards for Atmospheric Pollutants”	GB16297-1996
“General Principles for Safety and Health Requirements in Production Processes”	GB12801-91
“Industrial Enterprise Design Hygiene Standards”	TJ36-79
“Low Voltage Electrical Equipment Installation Engineering Construction and Acceptance Specifications”	GB50254–1996
“Mechanical Protection Safety Distance Standards”	GB12265-90