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Wind power tower coating line solution

Coating is an important part of the production process of wind power tower. The easy replacement of its quality directly affects the service life of wind power tower. How to ensure the coating quality of wind power tower is the focus of wind power enterprises. As a system service provider of coating environmental protection and air purification equipment, Jiutong can customize the overall solution of the wind power tower coating production line according to the production process and technical points of the wind power tower and combined with the actual application of the enterprise, so as to ensure the coating quality and give consideration to environmental protection and production efficiency!

Coating production line case workpiece - wind power tower attributes

Serial numberWorkpiece nameSize (long × wide × High)mmweight KGyield
1Wind power tower30000*φ(3000-5500)1500006 sections / day

Process design process of wind power tower coating (spraying) production line

1. Wind power tower conveying equipment

One or more combinations of transportation modes shall be selected. It is recommended that rail trolley + roller support

2. Coating process flow of wind power tower

Shot blasting→Flange zinc spraying-Painting (primer)→Chinese lacquer→Topcoat →dry

Serial numberworkmanshiptime minOperation moderequirementtemperature
1Primer spraying120automaticartificial10
2dry60-120automaticHot weather
3Finish painting90-100automaticartificial
4dry60automaticHot weather

In the paint spraying and drying room, dry-type paint mist recovery and filtration are adopted for workpiece spraying. The VOCs waste gas treatment equipment has passed the local environmental protection review, and online monitoring equipment is provided. After spraying, heat and dry on site.

The paint spray drying room is composed of the room body, the front gantry air supply, the indoor lighting, the rear gantry air extraction partition, the air supply unit, the paint mist separation unit, and the electrical control system.

                                                                                                                                            Painting section
Air supply
Gas extraction conditions
Air intake outside the workshop
temperature controlPainting operation: natural wind in summer; 3-9 ℃ in winter < br / > drying operation: 40-65 ℃
humiditySame as ambient humidity
CleanlinessG4 and G600 two-stage filtration
ExhaustPaint mist treatmentDry type (paint mist felt)
Waste gas treatmentActivated carbon adsorption catalytic combustion
Exhaust emission>15m Chimney discharge at high altitude
fire safetyCombustible gas alarm
Equipment noise≤75dB

Working principle during painting

During painting, the air supply valve and exhaust valve are open. First, the fresh air is filtered by the fresh air filter. Under the action of the air blower, the air flow enters the inlet of the static pressure chamber and is initially equalized by the deflector. When the air flow in the static pressure chamber is uniform and exceeds the original value of the precision filter cotton, it enters the roll coating room in the form of laminar flow. When the air containing paint mist is filtered out by the bottom filter cotton by the air induction principle in the wheel coating room, it is reflected by the organic gas in the exhaust gas through the adsorption of activated carbon, and finally the air is discharged into the atmosphere after reaching the standard. The discharged gas complies with the integrated emission standard of air pollutants (GB16297-1996).


Working principle during drying

Upper air supply and lower air return hot air circulation type. During drying, the fresh air valve is half closed and the exhaust valve is closed. The circulating air valve at the bottom of the supply fan is open. During drying, the circulating air is heated by the heat exchanger in the air supply / heating system. The drying design temperature is 0 ~ 60 ± 5 ° C, and natural gas is used as energy. Hot air is sent from the upper part and returned from the lower part. During the drying process of workpieces, the residual organic solvent in the paint film of workpieces is constantly volatilized. In order to make the content of organic solvent in the gas in the drying room lower than the lower limit of explosive concentration, the drying room keeps safe operation, a certain amount of fresh air shall be added to the circulating hot air, and a certain amount of high concentration exhaust gas shall be discharged. The drying room is equipped with a temperature sensor to display the temperature of each point and an automatic temperature regulating device to control the temperature fluctuation within ± 5 ° C.

3. Waste gas treatment equipment for air purification of wind power tower

Waste gas of roller paint→Paint mist filtration→Dry paint mist filtration + activated carbon adsorption→System fan→discharge         


Activated carbon regeneration

The organic waste gas purification device adopts a configuration of multiple activated carbon beds and one catalytic decomposition bed; The treatment air volume of each activated carbon bed is 20000 or 30000m3 / h; All activated carbon beds share a catalytic decomposition bed, and desorption is carried out in turn when it is not working.


Highlights of wind power tower coating production line

In order to ensure the purification efficiency and service life of the activated carbon adsorption bed, it is determined to set a primary paint mist filter in front of the activated carbon adsorption bed. The original filter box of the original exhaust unit can be used, and the internal structure is changed to our unique VQ pretreatment system, which can save the use of filter cotton and reduce the number of replacement.

According to the design specifications and standards of activated carbon adsorption bed, the amount of activated carbon shall be placed as much as possible in combination with the size of the existing exhaust fan unit, so as to increase the adsorption saturation period of activated carbon, meet the filtering wind speed required in the design specifications, reduce the number of periodic desorption, and improve the service life of activated carbon.

The catalytic combustion furnace is equipped with flame arrester, fire damper and other devices, which are controlled by PLC to realize interlocking control with each electrical system and interlock with the control system of the original paint booth. When there is a fault, the alarm will be given. The integrated adsorption bed is equipped with a nitrogen fire extinguishing system to further avoid potential safety hazards caused by fire.

The catalytic combustion regeneration system adopts internal circulation when desorbing. The desorbed hot gas and the decomposed exhaust gas are recycled by heat exchange, and then discharged when the desorption is completed. A concentration detection device is set in the hot air pipeline after the decomposition of waste gas to ensure that the desorbed hot gas is clean thermal air, which will not cause secondary pollution to the activated carbon when it is recycled to the adsorption bed for desorption, greatly improving the utilization of heat and reducing the loss of heating energy.

The activated carbon with high iodine value shall be selected to ensure the adsorption effect of the activated carbon and improve the adsorption efficiency and service life of the activated carbon. The honeycomb activated carbon with iodine value ≥ 1000 shall be selected as the concentration medium.

Noise reduction room shall be added for all fans, and noise reduction facilities shall be set to control the noise ≤ 80D.

Equipment list of wind power tower coating production line

1.List of spray drying integrated equipment
Serial numberentry nameParameters / specifications
一、Paint drying room
Housing system
Housing skeletonHS
Color steel plate and edgingHS 100mm rock wool board
(3)Static chamberHS
(4)Electric lifting gateHS
(5)emergency doorHS
Roll coating air supply system
(1)Forced draft fanB4-82-6.3E/15kw
(2)Air supply heating unit
(3)Switching air valve1000×1200mm
(4)Air supply duct and supportδ1.2mm hot rolled galvanized sheet
(5)Return air pipeline and support
(6)Steel platform
heating systemJT-21R-300
(1)Natural gas burner (including pressure regulating valve and hose)RS50
(2)Heat exchangerJT-TJR-50/310S Stainless steel plate
4、Exhaust systemJT-22-600
(1)Exhaust systemB4-72-12C -75kw
(2)Air valve
(3)Exhaust ductδ1.2mm Hot rolled galvanized sheet
(4)Exhaust noise reduction room50mm Rock wool color board and skeleton
(5)Exhaust soft connection
(6)Air valve and pipeline
(7)Chimney (including detection platform, ladder and lightning rod)1.2mm Galvanized sheet
Air filtration system
(1)Primary filterG4(bag type)
(2)Precision filter cottonG-600
(3)Primary filter bracket
6、Paint mist filtration system
(1)Paint mist filter cottonPA-50
7、lighting18W / piece * 4
Exhaust gas treatment systemSee exhaust gas treatment system
Electrical components

Main components: Schneider

10、Combustible gas concentration alarm system1 tor 4
Control systemSiemens PLC
(1)Electric control panel
(2)Electrical componentsPLC, frequency converter, contactor, thermal relay protector, etc
(3)Wire and cableinternational

Note: the equipment dimensions are for reference and can be designed and manufactured according to the customer's product dimensions.


2. Activated carbon adsorption + catalytic combustion equipment
Serial numberentry nameParameters / specifications
一、Activated carbon exhaust gas treatment + catalytic combustion regeneration systemJT-110-650
Activated carbon adsorption system

Pretreatment and activated carbon adsorption bedJT-112-200
Catalytic combustion desorption system

Catalytic combustion furnaceJT-RCO90(including desorption fan and make-up cooling fan)

Exhaust duct  
Galvanized sheet

Piping in the system 
Galvanized plate + rock wool insulation layer
Electronic control systemSiemens PLC, Schneider electric components

Note: the equipment dimensions are for reference and can be designed and manufactured according to the customer's product dimensions.

If you want to customize it, you can click this text

3. List of spare parts
Serial numberentry nameParameters / specifications
1Primary filterG4
Precision filter cottonG600,15 ㎡/Set
Secondary paint mist filter cottonF7

4. List of vulnerable parts
Serial numberentry nameParameters / specifications
1Primary filterG4
Secondary paint mist filter cottonF7

Advantages of components of wind power blade coating production line

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

  Spray drying integrated room


Main material of chamber

The thickness of the inner and outer wall plates of the chamber is δ 0.5mm galvanized steel plate, filled with sandwich insulation layer rock wool, rock wool δ 100mm thick, density 180kg / M ³, The temperature of the outer wall plate shall not be higher than 5 ℃ of the room temperature, the heat transfer coefficient shall not be greater than 0.38kcal / ㎡. H. ℃, and the average sound insulation capacity shall not be less than 21.5r (DB); It has the advantages of beautiful appearance, good sealing effect, good thermal insulation effect and excellent impact resistance; The column of the room body is made of steel structural section steel, all of which are sand blasted and sprayed with primer and finish paint. It has strong rust resistance and weather resistance. Its salt spray resistance is ≮ 500h, and its strength, stability, thermal insulation, sealing, impact resistance and seismic resistance meet the requirements of national or industrial standards


Adopt electric flexible lifting gate, steel welding stamping or aluminum alloy profile, anti-corrosion, salt and UV protection, track comprehensive accuracy: & lt; 3mm, one set is set at the entrance and exit of the room, and the surrounding is sealed. All tracks and door curtains are equipped with rubber seals, with good airtightness. The opening and closing speed of the door is 6-15m / min (self-defined), and the wind resistance performance: large use area (800-1500m2), and strong wind resistance performance (≤ grade 12); Safety measures: Low Voltage 24VDC control, infrared safety protection (or light curtain), door curtain operation warning light flashing, pressure airbag, etc. (some of which are optional); Control system: composed of Siemens programmable controller, Delta and other frequency converters or servo controller

emergency door

An outward opening safety door shall be set longitudinally in the room, and anti riot emergency lights shall be installed to facilitate personnel access and evacuation in case of emergency. Safety door size (width × Height) mm: 800 × 1900, the safety door is equipped with a mechanical pressure lock and an automatic door closer. When the pressure in the room exceeds 100Pa, it can automatically open the pedestrian door to relieve the pressure and play the role of explosion relief. According to the length of the roll coating drying room, 1-3 sets of safety doors are set at one side of the room

Air supply / heating system

According to the control wind speed specified in gb14444-2006 "safety regulations for painting operation - Safety Technical Regulations for painting room", and according to the requirements of industrial painting, the painting room adopts a micro negative pressure design, that is, the exhaust air volume is slightly greater than 3-5% of the air supply volume, which can prevent external dust from entering the work area.



           Swiss bellmo air valve controller

        Air supply / heating box

        Explosion proof centrifugal fan

        Explosion proof centrifugal fan

Exhaust system

One set of b4-72 explosion-proof centrifugal fan unit is provided, and the fan and motor are explosion-proof; The exhaust fan base is welded into a frame with channel steel and angle steel industrial profiles, and the exhaust pipe is made of a1.2mm high-quality galvanized steel plate, without welding, to ensure that the pipeline is formed without deformation; A damping or elastic reducer is installed at the bottom of the fan, and a fan noise reduction room is designed to ensure that the system noise is controlled below 75dBA; The size of the exhaust chimney is determined by the air flow velocity and the concentration of harmful substances discharged. The wind resistant structure is used for reinforcement in the installation.


Painting system

It is composed of American Graco manual high-pressure airless spray gun paint supply room or spraying robot, which can be customized by customers


                Graco manual high pressure airless spray gun

             Paint supply room

            Spraying robot


Dry type filter device is adopted and two-stage filter is provided. The filter grade is box type filter and F7 respectively. Online differential pressure transmitter is set before and after the filter to ensure the normal, safe and stable operation of the waste gas treatment system.


Box filter



The labyrinth design of the box type filter uses the centrifugal principle to ensure better filtration of paint mist. The first and second layers are made of glass fiber flame-retardant filter materials with high filtration and purification efficiency and no secondary pollution, which have the characteristics of high dust volume; The third and fourth layers are made of high-efficiency non-woven fabric materials to ensure higher dust filtration efficiency. After purification by the dust treatment device, the dust concentration in the exhaust gas is ≤ 0.04mg/nm3. The dust filter material is installed in a drawer type, which is convenient and quick to replace

The high-efficiency filter material in F7 is a non-woven fabric composed of organic synthetic fibers and microfibers. It has a gradually increasing fiber structure, with an average capture efficiency of more than 99% and a temperature resistance of 90 ℃. The filter adopts modular design to facilitate assembly, installation and disassembly, so that the equipment has good practicability. The filter frame and floor adopt full welded structure to ensure no leakage and air leakage. All exhaust gases pass through the filter bag, and the paint mist capture efficiency is up to 99%.

Waste gas treatment equipment

During painting operation, the exhaust gas shall be treated to make the treated exhaust gas meet gb3l6297-195 (comprehensive emission standard of air pollutants). In this scheme, activated carbon system + RCO catalytic combustion is adopted, and organic waste gas is adsorbed by using the adsorption characteristics of activated carbon micropores. The waste gas with low concentration, low temperature and hydrocarbon can be treated. The solvent can be recovered and reused, and the purification efficiency is as high as 90-95%. Activated carbon is a non-polar adsorbent with hydrophobic and organophilic properties. It can absorb most organic gases, such as benzene, aldehydes and ketones, alcohols, hydrocarbons, etc., as well as odor substances. After the adsorption is saturated, it can be desorbed and regenerated by hot air and put into use again


Activated carbon

Activated carbon is mainly used for purification of various organic waste gases with low concentration and large air volume, including benzene, phenol, ester, aldehyde and other organic gases such as toluene, xylene and benzene, as well as odor gas. Jiutong activated carbon uses specially shaped honeycomb activated carbon with high micropore and high specific surface area as the adsorption material, with a specific gravity 8-10 times larger than that of strip activated carbon fiber, It has the advantages of large adsorption capacity (the adsorption of organic solvent before regeneration can reach 25% of the total weight of activated carbon), small resistance, fast adsorption speed, low operating cost and long service life. The purified gas fully meets the environmental emission requirements.

Catalytic decomposition bed

When the organic waste gas passes through the honeycomb ceramic catalyst decomposition bed, HC molecules and O2 molecules are respectively adsorbed on the catalyst surface and activated, so it can be rapidly and completely oxidized and decomposed into harmless carbon dioxide and water vapor at a lower temperature (200-300 ℃), and heat is released at the same time; All processes will not cause secondary pollution. The purification rate of catalytic decomposition is generally above 98%, and the reaction temperature is low and no × Generated. Using high-quality noble metal palladium and platinum as catalysts, the catalytic decomposition rate is more than 99%. It has the characteristics of high specific surface area, large reaction space velocity, long service life, low decomposition temperature, low resistance, short desorption preheating time, low energy consumption, high mechanical strength, wear resistance, heat shock resistance, good catalytic activity and thermal stability

Standard equipment


                      Lighting device

        Safety alarm system

        PLC display interface

         Electronic control system

Scheme standard for coating production line of wind power tower

In line with national / industrial / local standards, the whole wind power tower coating production line is efficient, stable, safe and environmental friendly. 

National standards / industrial standards / local standardsnumber
《Corrosion grade and derusting grade of steel surface before coating》GB8923-88
《Hygienic standard for air dust in workshops》GB103328-10333-89
《Safety regulations for painting operation: safety of pretreatment process before painting and ventilation and purification》GB7692-1999
《safety standards》GB2894-1996
《 Safety requirements for protective covers of industrial enterprises 》GB8196-87
《Code for design of low voltage power distribution》GB50054-95
《Safety standard for handrail of climbing platform》GB4053-83
《Safety regulations for painting operation, safety of painting process and ventilation and purification》GB6514-1995
《Safety regulations for coating operation, labor safety and labor hygiene》
《Code for noise control design of industrial enterprises》GBJ87-85
《Safety Peugeot》GB2894-1996
《Standard for lighting design of industrial enterprises》GB50034-92
《Industrial machinery and electrical part 1: General Technology》
《General specification for electrical equipment of industrial machinery》GB/T522611-96
《Noise standards for industrial enterprises》GB12348-90
《Comprehensive emission standard of air pollutants》GB16297-1996
《General rules for safety and health requirements in production process》GB12801-91
《Hygienic standard for industrial enterprise design》TJ36-79
《Code for construction and acceptance of low voltage apparatus in electrical equipment installation engineering》
《Safety distance for mechanical protection》GB12265-90

Wind power industry coating production line case site




Sand Blasting Room With Wind Recycling
Cartridge type dust collector
Activated carbon adsorption + ROC catalytic combustion
Zhejiang Jiutong Intelligent Equipment Co., Ltd. All Rights Reserved Record No:Zhejiang ICP No. 2022015774-1