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Dry Filter Spray Booths

The dry spray booth adopts the dry method to separate the paint mist. According to the paint mist treatment medium, it is divided into baffle plate (dry limestone) and filter cotton type. The dry type is suitable for small batch production. The advantages of filter cotton type are simple and convenient maintenance, and relatively speaking, the cost of replacing filter cotton is high; However, the maintenance cost of baffle plate is high and complex, and it is difficult to clean the paint mist, but it can be recycled. Jiutong dry spray booth is characterized by simple operation and maintenance, small occupied space, stable operation, low operating cost, low noise and high spray treatment efficiency. It has been successfully implemented in many projects, such as CIMC refrigerated container manufacturing, Baotou Guodian power, Langfang Zhongchen petroleum equipment, Liaoning Huarong heavy industry machinery, etc.


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  • High efficiency of spray treatment: the capture efficiency of spray in dry spray booth can reach 95%

  • Low investment cost: the foundation of the building is shallow and simple, which does not occupy space. At the same time, the labor cost and construction period are reduced

  • Low noise: compared with the wet paint booth, the induced draft fan has low power and low noise

  • The working environment is good: the wind speed in the section of the room is ≥ 0.45m/s (loaded state), and it is evenly surrounded outside the workpiece. The paint mist will not splash during painting, so as to improve the health conditions of workers

  • Environmental protection: no water circulation, no water pollution, and save water treatment investment


Dry paint booth is mainly used for painting various structural parts, involving industries such as petrochemical industry, engineering machinery, aerospace, mining machinery, automobile, special vehicle, railway, wind power, refrigerator manufacturing, etc



When painting in the dry paint booth, the external air is filtered by the primary filter cotton at the air inlet and sent to the static pressure chamber in the paint booth by the forced draft fan, and then enters the working space of the paint booth after secondary filtration and diversion. At this time, the dust content of the air is ≯ 1.5mg/m3, and the maximum particle diameter < 5um, the air purification reaches 100000 level standard, and the air flow forms a wind curtain around the workpiece. At this time, the loaded wind speed in the paint room can reach 0.45m/s (loaded state). The paint mist generated during painting will not stay at the breathing belt of the operator, but will drop rapidly with the air flow. Then, under the action of the exhaust fan, it will shrink to the return air outlet under the pit grille, and enter the organic solvent adsorption box (activated carbon fiber mesh adsorption) for treatment after being filtered by the dry paint mist filter material (dry limestone or dry filter cotton), The pollutants in the exhaust gas are adsorbed on the solid surface, and the purified gas is discharged at high altitude. The discharged gas complies with the integrated emission standard of air pollutants (GB16297-1996)


                                                     Working principle of dry spray booth


                                                        Interior drawing of dry paint booth


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


main materialsStatic chamberElectric roller shutter doorPitfoot level grill

The thickness of the inner and outer wall plates of the dry paint spraying room is δ 0.5mm galvanized steel plate, filled with sandwich insulation layer rock wool, rock wool δ 50mm thick, density 120kg / 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); The salt spray resistance is ≮ 500h, and the grounding resistance is not more than 100 Ω. It has the advantages of beauty and durability, good sealing effect, good thermal insulation effect, and excellent impact resistance.

The fresh air sent from the air supply system enters the static chamber and passes through the high-efficiency air filter cotton. The air flow is more uniform in the operation room. The high-efficiency filter cotton is imported from the Netherlands "Filtrair" products. The static chamber is provided with a profile steel framework, and the top net is of high-quality C-shaped steel structure. After special rust prevention treatment, it has good rigidity, no corrosion, and easy to replace the top cotton.

The European roller shutter door is selected, the new metal material is double-layer rolled and formed, and the middle is filled with polyurethane thermal insulation foam material without hydrocarbon fluoride. It has good thermal insulation and bending resistance, and prevents the occurrence of condensed water; Double layer hollow aluminum alloy door, with a thickness of 2.4 mm, strong and durable; The surface of the profile is multi-layer baking paint or film layer, which has excellent scratch resistance, corrosion resistance, non-corrosion, wear resistance, knock resistance and impact resistance; During startup and operation, it is fast and noiseless (the speed can reach about 0.1m/s and the noise is less than 58db).

The pit is about 1200mm below the ground where the grating falls, and a set of lighting is set at an interval of 1500mm on both sides of the channel to facilitate painting on the bottom of the structural member. The upper part of the pit outside the two tracks is laid with a grid according to the floor height, and the middle is arranged with paint mist filter glass fiber cotton.

A pit is set at the bottom of the chamber, and the grating plate is laid on it. The nine-way grating plate is self-made. After processing, it is all hot-dip galvanized to avoid the waste newspaper and waste tape from entering the underground structure due to the scribing and pasting of the decorative tape when the workpiece is painted; It is welded by 40x3mm flat steel and Φ 8 round steel, and its bearing capacity is not less than 500kg / m2; In order to facilitate disassembly and cleaning, each piece has an area of about 1m2 and a weight of ≤ 25kg / m2; It is suggested that the over painted mud deposited on the grid can be chemically removed with paint remover and then cleaned, or incinerated in an incinerator.

Air supply system

The control wind speed of the dry-type paint booth must comply with the control wind speed required by gb14444-2006 safety regulations for painting operation and technical regulations for safety of paint booth. The principle of micro positive pressure shall be considered for the air supply volume of the spray booth, that is, the exhaust volume is slightly less than 3-5% of the air supply volume, so that the external dust will not enter the operation area through the door seam of the room. The modular design concept organically combines the air supply and heating systems into a set of modular systems, and skillfully organizes the air flow inside. The framework of the module system is welded by industrial profiles, and the surface is paved δ 100mm rock wool color steel sandwich panel, and access doors are set in each functional area.

Air inlet sectionFilter sectionFan sectionHeating section

The air inlet is installed with metal mesh to prevent birds and sundries from being sucked in. The air inlet is arranged indoors, and the air outlet is arranged at high altitude to ensure that the exhaust gas will not be sucked again. The air volume regulating valve is set to regulate the air inlet to ensure the matching with the exhaust air volume. The air valve conversion section is to realize the conversion of spraying and baking. It is composed of an air valve and an automatic air valve controller. The automatic air valve controller is made of Swiss bellmo products, which are sensitive and accurate。

The fan case is made of profile as wall plate, composite metal frame structure, and equipped with one access door. The air box is equipped with primary and medium effect filters. The primary effect filter is a bag type non-woven fabric filter with aluminum alloy frame, and the type is four bag type. The synthetic fiber filter material vnf-290 of vnf "all-louders" series of the Netherlands "Filtrair" company is adopted, with a filtration accuracy of G3 and a filtration efficiency of ≥ 80%. Medium efficiency filtration adopts 5-bag aluminum frame non-woven fabric filter, with filtration accuracy of F5 and filtration efficiency ≥ 85%.

The fan adopts double suction bkkf explosion-proof centrifugal fan, which has the characteristics of good performance, high efficiency, beautiful appearance, compact structure, stable operation, and convenient installation and maintenance. The forced draft fan base is welded into a frame with channel steel and angle steel industrial profiles to bear the weight and vibration of one forced draft fan; Air supply pipes are all made of δ 1.2mm high-quality galvanized steel plate undercut production, without welding, to ensure that the pipeline is formed without deformation; A damping or elastic reducer is installed at the bottom of the fan. At the same time, we have designed a fan noise reduction room to ensure that the system noise is controlled below 75dBA

In order to ensure the adhesion between the paint film and the workpiece substrate in winter, it is generally required that the ambient temperature should be ≥ 15 ゜ C. the added heating device ensures the spraying effect of the operation at low temperature in winter and is integrated into the air supply system; According to the requirements of heating power value in winter, btg28p two-stage fire gas burner of Italian "Baltur" company is selected as the burner, which is safe and energy-saving

Exhaust system


The selection of exhaust fan in the dry-type paint booth is mainly determined by the two parameters of fan air volume and fan head. The frame is welded with channel steel and angle steel industrial profiles, and the exhaust pipe is made of δ 1.2mm high-quality galvanized steel plate undercut production, 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 high-pressure airless paint pump, pneumatic mixer, paint filter and pipeline. It is installed in the paint pump room (paint supply room). The paint pump system is connected to the paint booth by pipeline


Paint supply room

One (5.5m) is installed under the platform of the air supply system × 2m × 3m(L × W × H) Paint supply room. Equipped with exhaust fan, the exhaust volume shall not be less than 10 times / min, and explosion-proof exhaust fan and lighting shall be adopted. Ground wires shall be buried in the paint supply room to prevent fire caused by static electricity; In order to facilitate the painting operation, compressed air quick connectors are set on both sides of the paint booth


Spray gun

American Graco manual high-pressure airless spray gun is adopted, with ergonomic design and strong comfort; Elliptical insulated handle, high safety; The structure design is compact and reasonable, with mobile hose, flexible operation even in narrow space, and high spraying quality; The spray gun filter is easy to take out and easy to repair, reducing the maintenance time due to nozzle blockage.


Robot painting

With the rising labor cost and the gradual disappearance of the population dividend, it has become an inevitable trend for robots to replace people. The robot is used to replace the spray painting workers for spray painting, which can avoid the heavy labor of the operators in the harsh working environment, and can ensure the stable surface quality of the workpiece and high production efficiency.

Air purification system

The dry-type spray booth adopts 2-3 levels of filtration: primary 1-2 level filtration and sub high efficiency filtration (top filtration) of air inlet, which is composed of air inlet filter, top filter material, top cotton support net, connecting plate, etc; The sub high efficiency filter material is set at the bottom of the static chamber and supported by the top cotton support net. The top cotton support net is of high-quality C-shaped steel structure. After special rust prevention treatment, it has good rigidity, no corrosion and easy to replace the top cotton;


Initial effectFilter material


Sub high efficiency filter material

The synthetic fiber filter material product vnf-290 (G3) and the bag filter of the filter section of the air supply system can increase the cotton area of the air inlet by 3-4 times with the cloth bag structure. The adoption of this filter form can reduce the wind resistance, increase the dust capacity and reduce the replacement times

The Dutch "arresters" synthetic fiber filter material cc-600g (F5) is selected as the sub high efficiency filter material, which can filter out all particles that can damage the paint quality, and the dust content is 100% removed to ensure that the air flow passing through the paint booth is evenly diffused and forms a laminar flow state, which conforms to the fire classification standards of European din53438-f1 and American ul900-class1.

Paint mist treatment system

Dry type paint mist filter is used to set three exhaust ducts on the floor of the spray booth, i.e. left, middle and right. Baffle plate and paint mist filter device are installed in the air duct to absorb the paint mist. The paint mist filter device is composed of a filter fiber support net and a filter fiber cotton, and the baffle filter fiber cotton is placed on the support net. When replacing, remove the upper floor grid, take out the flat filter cotton and support net, and then replace the vertical filter cotton. The saturated filter bottom cotton is sent to the incinerator for incineration to prevent environmental pollution. The flat filter cotton can absorb a large amount of paint mist, and the efficiency can reach more than 98%; After spraying for a period of time, when the adsorption of the tiled filter cotton reaches saturation so that the air flow cannot pass through, the two layers of the tiled filter cotton form a folded flow plate. After the spray mist passes through the air flow, about 70% of the paint mist will settle on the tiled filter cotton after being folded. The remaining paint mist will settle at the bottom of the air channel after passing through the folded flow channel. About 2% of the paint mist will be further absorbed by the vertical filter cotton, and finally the standard air flow will be discharged from the exhaust duct.


Exhaust gas treatment system

During painting, the exhaust gas shall be treated to make the treated exhaust gas meet the integrated emission standard of air pollutants (gb16297-195). There are two common treatment methods in our dry spray booth: activated carbon system + RCO catalytic combustion and molecular sieve zeolite runner adsorption + catalytic combustion.


Activated carbon adsorption + RCO catalytic combustion

The organic waste gas can be adsorbed by using the adsorption characteristics of activated carbon micropores, and 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

Molecular sieve zeolite runner adsorption + catalytic combustion

The zeolite runner concentration area can be divided into treatment area, regeneration area and cooling area. After collection and pretreatment, VOC organic waste gas enters the zeolite molecular sieve runner system. Through the continuous process of adsorption desorption concentration of zeolite molecular sieve runner, large air volume and low concentration organic waste gas is concentrated into small air volume and high concentration waste gas, and then enters the regenerative oxidation furnace for combustion purification, And effectively utilize the surplus heat released by the combustion of organic matter.



All light boxes are made of δ 1.2 the galvanized plate is made and sprayed with white paint, which is beautiful and elegant, and can prevent rust; The lamp tube adopts explosion-proof Philips high-efficiency light source, which is safe, energy-saving and easy to maintain. The ballast adopts the special electronic ballast for the paint booth to ensure that the light intensity of each paint booth is ≥ 80olux and meet the spraying operation of each end face of the workpiece. The light box and the wall panel are connected by small angle iron, and the light box is equipped with a detachable frame for easy maintenance.

Safety alarm system

The differential pressure detection alarm adopts the sound and light alarm mode, and is interlocked with the air supply and exhaust system to cut off the fan operation and remind the operator to replace the filter material; The combustible gas detection and alarm instrument has a central control system and multiple detection channels, which can connect multiple probes. The probes are placed on each indoor working section to monitor the indoor combustible gas concentration at any time and send out alarm signals.


3D operation platform

The lifting is stable, the transportation is reliable, and the structure is reasonable. The operator only needs to press the six buttons of lifting, lowering, advancing, retreating, front and rear to realize the horizontal, vertical and front and rear movement of the working platform. In order to ensure safety, iron chain guard rails are arranged on both sides of the extended platform; The limit switch in the room is of safe voltage, and the pull tube, junction box and motor are of explosion-proof type, thus ensuring the safety of the three-dimensional trolley

Electronic control system

The components of the electronic control system of the dry-type paint booth are famous brands such as Omron, Siemens and Schneider. The main circuit has protection functions such as overcurrent, overload, short circuit and lack of power, ensuring high reliability of the electrical control system and low failure rate. The line design is reasonable, with short-circuit protection, overload protection and other functions and reliable grounding protection system. PLC programming can control the whole equipment; The distribution control cabinet in the system is sprayed with plastic on the surface, which is beautiful and generous



                    全封闭干式喷漆房                             Passage type dry spray booth

       1. Overhead unit

       2. The paint mist treatment is the combination of filter cotton and baffle plate

       3. Fresh air adopts two-stage filtration

       4. Direct combustion exhaust gas treatment device

          1. Right type unit

         2. The paint mist treatment is the combination of filter cotton and baffle plate

          3. Fresh air adopts two-stage filtration

          4. Activated carbon waste gas treatment device



Comparison of equipment parameters

Serial numbernamenumerical valuenumerical valueparameter
1Paint booth typeFully enclosed dry spray boothPassage type dry spray booth
2Equipment size12000*6000*5600mm18000*5000*6000mm
3Gate size5000*5000mm3500*5000mm
4wind speed≥0.3m/s≥0.3m/sNo load
5Air supply volume78000m³/h97500m³/hOutward wind speed
6Exhaust air volume77000m³/h93000m³/hExplosion proof motor
7Fan power9.0*4+22*2=80KW7.5*6+22*3=111KW
8Lighting power3.9KW
Explosion proof lamp


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

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


Why do you choose Jiutong

Jiutong quality assurance

  • Company strength

    1. It has double certificates of ISO9001 quality management system and environmental management system to protect the product quality

    2. In 2014, it was listed as a high-tech environmental protection coating enterprise recognized by aerospace enterprises

    3. National high-tech enterprise and safety production standardization certification company

  • Technical strength

    1. Complete the technological innovation of "coating industrial robot", "coating waste gas treatment system", "environmental protection recycling abrasive recovery system" and "composite strong sand absorption base plate technology"

    2. Obtained 8 national patents and possessed independent intellectual property rights

    3. More than ten years of experience in the application and implementation of equipment (standard and non-standard) and production line customization projects, which is trustworthy

  • Quality price

    1. Not practicing fraud and sticking to quality is the first lifeline of the enterprise

    2. The source equipment manufacturer has a warranty period of two years (excluding vulnerable and consumable parts), and the price is guaranteed on the basis of quality assurance

  • after-sale service

    1. Have a professional trained construction team to complete the project with quality assurance

    2. The after-sales department implements 7 * 24-hour telephone or online service

    3. It has after-sales service stations in Beijing, Shandong and Zhejiang, and has a perfect after-sales system with high troubleshooting efficiency

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Zhejiang Jiutong Intelligent Equipment Co., Ltd. All Rights Reserved Record No:Zhejiang ICP No. 2022015774-1