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Steam heating paint drying room

The steam heating paint drying room is used to accelerate the drying process of water-based and solvent-based coatings. The steam heating method is combined with the advanced hot air circulation system to make the temperature distribution of the upper, lower, left and right of the working room uniform, realize the uniform curing of the paint film and sealant, and obtain the best quality and most durable finish. The whole drying process is highly automated. Jiutong steam heating and drying room has the advantages of good indoor environment, good indoor thermal insulation, uniform heating of workpieces, good paint film quality, no waste gas and heat emission, and no noise pollution. It has been successfully applied in China Industrial Machinery Design Institute, China Shenzhou aircraft Co., Ltd., China Aerodynamic Research Institute, Shanxi 5449 plant, Zhangjiakou Xuanhua Huatai mining and metallurgical machinery and other enterprises. The project has rich construction experience and shortened the construction period, Quality assurance.


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  • Thermal insulation and durability: the drying room is composed of angle steel, stainless steel plate and galvanized steel plate, and the insulation layer is filled with high-density rock wool, which ensures the thermal insulation of the oven and the safety of users

  • Low energy consumption and cost: compared with natural gas and electric drying, steam drying has low operating cost; Hot air circulates in a closed room, with high thermal efficiency and energy saving

  • Modular design: modular combination of library board units, content product can be arbitrarily enlarged, and disassembly is convenient

  • Good curing effect: good indoor thermal insulation, advanced hot air circulation system, uniform heating of workpieces, and the best film quality can be obtained

  • Non standard Customization: Jiutong steam drying room is customized according to the requirements of customers to ensure the applicability, stability, practicality and energy saving of the equipment

  • High degree of automation: independent console, automatic control system, intelligent temperature control instrument temperature control, automatic shutdown and other functions


The steam heating paint drying room is applicable to the drying and curing treatment of various structural parts and components. The industry involves petrochemical, engineering machinery, aerospace, mining machinery, military industry, automobile, special vehicle, railway, wind power, refrigerator manufacturing, furniture and other industries



The saturated steam passes through the steam heat exchanger. Under the action of the circulating fan, the air flows through the surface of the heat exchanger to realize heat exchange. Then the heated hot air is sent to the steam heating paint drying room for heat exchange with the workpiece to achieve the purpose of heating. Then, it returns to the steam heater for heating through the return air pipeline to form an internal circulation. After repeated heating, the indoor temperature reaches the set value. When the temperature reaches the set value, the steam solenoid valve will automatically stop working. At this time, the fan will continue to work, and the indoor temperature will gradually decrease. When the temperature drops to a set value, the steam solenoid valve will automatically work, so that the temperature will rise to the set value again. The drying room is equipped with a multi probe combustible gas concentration detection device. When the solvent concentration reaches 25% of the explosion limit (which can be freely set), the alarm will be given immediately. At this time, the conveying system will stop operating. The drying temperature is automatically controlled by the temperature sensor, and three measuring and control points are set in the length direction.



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



Main material of chamber

Column and beam of chamber body adopt □ 120 × one hundred and twenty × 5 square pipe production, purlin adopts □ 50 × fifty × 3 rectangular steel pipe, all skeleton materials are subject to anti-corrosion treatment, with good thermal insulation performance and large bearing capacity; The thickness of wall plate in the chamber is δ 1.5mm galvanized steel plate, the outer wall plate is made of δ 100mm thick rock wool sandwich (rock wool density is 120kg / m3) insulation board, and the material of the chamber body is δ 1.5mm cold plate, so that the temperature of the outer wall plate is not higher than 5 ℃ of the room temperature. The two ends of the chamber body are provided with profiling door openings.

Steel structure platform

A steel structure platform is designed above the drying channel, which is directly connected to the ground through the column, that is, the drying channel itself does not bear the steel structure platform, and the two are separated. The hot air circulating heating system is installed on the steel structure platform. In order to facilitate the maintenance of operators, a steel ladder is set on one side of the platform, and safety protection railings are set around. The ladder and railings are designed and manufactured according to national standards.

Electric liftgate

Steam heating paint drying room door body δ 100mm rock wool machine-made color steel sandwich plate, insulation plate inner plate δ 1.5mm galvanized plate; The outer plate adopts: δ 0.6 corrugated color plate;

Hot air circulation heating system

Steam radiatorSteam solenoid valveCirculating fanTemperature control system

The finned tubes of the hot air circulation radiator in the steam heating paint drying room are all made of 15x0.3mm corrugated steel strip wound with ¢ 21x2.0mm seamless steel pipe, with a sheet spacing of 5.0, a sheet thickness of 0.3mm, and a heat exchange area of 0.9 ㎡ per meter Because the contact surface between the cooling pipe and the cooling fin is wide and tight, the heat transfer performance is good, stable and corrosion-resistant, the appearance is beautiful, easy to install, easy to manage, and durable

The steam (liquid) solenoid valve is the actuator used in the industrial process automation control system. It can automatically open or close the valve after receiving the electric control signal to realize the on-off or flow control of the fluid medium in the pipeline, so as to automatically adjust or remotely control the temperature, flow, pressure and other parameters in the system, with high accuracy; Adopt pilot type secondary valve opening structure, small volume and small power; There are good thermal insulation and buffer members between the pilot valve and the main valve; The high-quality magnetic materials with temperature resistance and corrosion resistance are selected, and the PTFE valve port seal is formed by piston molding, with high performance and long service life.

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

The drying temperature is up to 200 ℃, which can be adjusted and set according to the needs to adapt to the development of coating production and the use of different coatings. The temperature in the furnace is displayed and automatically controlled by the digital temperature controller. One point is set at the front, middle and rear of the drying room. The middle point controls the temperature, and the front and rear two points display. A temperature display is set in the heating room. The collected signal is sent to the temperature controller of the control cabinet. The temperature controller automatically controls the work of the heater according to the set drying temperature value to ensure that the temperature in the room meets the completion of the drying task. It has the function of overtemperature audible and visual alarm and automatic interlock shutdown.

High temperature resistant filterAir supply and return pipesAir curtain systemExhaust gas traction fan

A filter device is set at the air outlet to ensure the cleanliness of circulating air. 3001gg high-temperature resistant coarse effect flat filter is selected. It is made of alkali free glass fiber filaments. The fiber layer is thin to dense from the windward side to the leeward side, effectively blocking dust. It has the characteristics of large air volume, small resistance, flame retardancy, chemical corrosion resistance and excellent radiation resistance.

The air supply pipe and return pipe of the heating system guide the hot air to circulate in the drying room and transfer the heat to the workpiece. The outdoor part of the air pipe adopts δ 30mm rock wool thermal insulation material package, easy installation, beautiful appearance. In order to promote the strong circulation of hot air in the room and make it evenly distributed, regulating butterfly valves are set at the inlet of air supply pipe, return pipe, fresh air makeup pipe and exhaust gas discharge pipe. The air supply and return pipes in the drying room are all made of δ 1.5mm galvanized plate undercut fabrication without welding. The appearance of the pipeline is ensured. Flange connection is adopted for connection between pipelines, and asbestos rope is filled between flanges as sealing material.

In order to reduce the energy loss during the system operation, an air curtain is set at the entrance and exit of workpieces to cut off the heat outflow by high-speed air flow.

The air volume of exhaust gas traction fan is determined according to the air volume of fresh air in the drying room, and the two shall be equivalent.

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 commonly used treatment methods in the steam heating paint drying room of our company: 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.


The upper and lower rows of lighting devices are set in the steam heating paint drying room. The top side lamp group is installed at a 45 º angle, and the arrangement is: 2 × 40W × 2 sides; The waist lamp group is installed in the wall panel at intervals, and the arrangement is: 2 × 40W × 2 lines. All light boxes adopt δ 1.2 the galvanized plate shall be made and sprayed with white paint, which is beautiful and generous, and can prevent the appearance of 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 spray booth, so as to ensure that the light intensity of each spray booth is ≥ 800Lux 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; Install a pressure lock on the pedestrian door for control. When the indoor pressure is too high, it can automatically open the pedestrian door for pressure relief; 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.

Electronic control system

The electric control scheme strives to be economical, reasonable in structure, safe and reliable. The principle of proximity setting is adopted. The electric control cabinet is vertical with front and rear doors. All electrical components are installed in the control cabinet. Each motor operation control circuit is equipped with corresponding low-voltage circuit breaker, thermal relay and other protection components to realize short-circuit and overload protection of the motor; Air supply and exhaust are automatically controlled by PLC; The user is responsible for the primary power distribution (i.e. power transmission from the workshop power distribution cabinet to the equipment electric control cabinet), and we are responsible for the secondary power distribution (i.e. power transmission from the equipment electric control cabinet to the equipment). The design and installation of the electric control system comply with the relevant national electrical safety specifications, with high reliability, reasonable layout and convenient maintenance.



Serial numberentry nameParameters / specifications
1Structural form of steam heating paint drying roomContinuous passing type
Heating modeHot air circulation convection heating
Dimensions of the chamber27.5m(L)X8.2m(W)X3.0m(H)

Door opening size1200×900mm
4Circulating air volume≥117970m3/h

Fan air volume63812m3/h

Fan modelGW12C

Total pressure1137Pa

Power of forced draft fan30kw

Drying temperature90℃
Temperature rise time (room temperature - 60 ℃)≦35min
Hot air heating value1123Kw

Heating modeSteam heating
Makeup air volume of fresh air2500m3/h
9Waste gas treatment methodEmission after activated carbon adsorption
10 filter
Circulating outlet airHigh temperature plate filter
Fresh air supplementCoarse effect filter
Temperature measurement and control pointThree places, front, middle and rear
Temperature difference between the outer wall of the drying channel and the environment≦5℃
Installation power≦61kw

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

Structural parameters of drying channel of steam heating paint drying room
Serial numberentry name
weight KG
1Baking path
Drying channel frameworkSquare tube 120×120×5
Drying purlinSquare tube 50×50×3
Thermal insulation wall panel of drying channelδ100mm Rock wool machine-made color steel sandwich panel, insulation panel inner panel δ 1.5mm galvanized plate; The outer plate adopts: δ 0.6 corrugated color plate;
Wrap angleδ1.5mm Cold plate
Oven doorGate body δ 100mm rock wool machine-made color steel sandwich plate, insulation plate inner plate δ 1.5mm galvanized plate; The outer plate adopts: δ 0.6 corrugated color plate
2Steel platformPlatform skeletonChannel 14#
panelδ4mm Pattern plate
Railingnational standard
Laddernational standard


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


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