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Natural gas radiant heating paint drying room

Natural gas radiation heating paint drying room can directly transfer energy to the paint. After irradiation, the temperature of the workpiece itself to the infrared radiation does not change much, but the temperature of the coating will rise rapidly and dry at the same time, so that the cured paint film is uniform and bright in color; When the equipment is in operation, the panel is sprayed with combustible gas, which will not burn and is fireproof and explosion-proof. Jiutong natural gas radiant heating and drying room adopts natural gas catalyst catalytic combustion infrared radiation technology, which can achieve complete flameless combustion during combustion, and realize real flameless combustion, with high curing efficiency, good effect, fire and explosion protection, safety and environmental protection, energy saving and cost reduction. It has been approved by China Industrial Machinery Design Institute, China Shenzhou aircraft Co., Ltd., China Air Power Research Institute, Shanxi 5449 plant The successful application of Zhangjiakou Xuanhua Huatai mining and metallurgical machinery and other enterprises has laid a wealth of experience for subsequent projects.


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  • Energy saving: according to the nature of the coating, it generally saves 10-40% energy than the existing combustion engine heating method (according to the nature of the coating).

  • Short curing time: the coating can be heated to 200 ℃ in less than two minutes. Generally, the coating can be cured in about 8-10 minutes, so the floor area of the curing furnace only needs 1 / 2 to 1 / 3 of the original.

  • Explosion proof and maintenance free: no matter what kind of coating and material, there will never be the possibility of fire (Natural Gas version). It is safe and reliable, basically no maintenance is required, and only some cables need to be replaced when the number of years is long. The service life of the overall equipment is extremely long. There are cases that have been used for more than 20 years and are still in use abroad

  • Medium wave only heats the coating: only heats the powder or paint on the surface of the workpiece, without heating air or metal, so the workpiece can be cooled quickly after coming out of the furnace (if the workpiece is close to the panel, the surface heat of the panel will be transferred to the workpiece, and the heated coating will also transfer heat to the workpiece)

  • The paint color is more bright: the air flow speed in the furnace is small, ensuring the uniformity of the film thickness. It can be dried and cured in different colors at the same time, and the color is better than that cured by hot air circulation

  • The powder coating is not easy to blow off in the furnace: there is no hot air or the hot air speed is very small, so the workpiece enters the curing furnace, and the powder coating is not easy to be blown off by the circulating air

  • Waste gas treatment function: the natural gas recycling version has the function of treating 80-90% of the harmful gas in the furnace to reduce the emission of waste gas


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



The natural gas radiant heating paint baking room adopts the natural gas catalyst catalytic combustion infrared radiation technology. The catalytic combustion is to control the combustion reaction on the surface of the catalyst. The combustion can achieve complete flameless combustion and realize real flameless combustion. Therefore, it is highly efficient and absolutely explosion-proof The catalytic combustion causes the reactants to form surface free radicals of energy on the surface of the catalyst, generate vibrational excited products instead of electronic excited products (the electronic excited products cause visible light and flame), and almost completely release energy in the form of infrared radiation. The infrared rays act on the chemical bonds of the coating molecules. When the spectral frequency corresponds to the absorption band of the coating, the radiation energy is absorbed by the chemical bonds to form a resonant state The chemical bond is broken to achieve the purpose of drying and curing. Infrared radiation curing fundamentally avoids the loss of combustion energy caused by visible light, so catalytic combustion is the best combustion mode to make the most full and effective use of combustion energy.



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



Main material of chamber

□ 120 is adopted for the column and beam of the drying channel framework × one hundred and twenty × 5 square pipe production, purlin adopts □ 50 × fifty × 4 rectangular steel pipes, all of which are subject to anti-corrosion treatment, have the characteristics of good thermal insulation performance and high support stiffness; The thickness of the inner wall plate is δ 1.5mm galvanized steel plate, the thickness of the outer wall plate is δ 0.80mm corrugated color steel plate with intermediate filling δ 200mm 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, strong thermal insulation performance, so that the temperature of the outer wall plate is not higher than 5 ° C of the room temperature.

Steel structure platform

It is welded with 14 # channel steel and laid on the table δ The 4mm pattern plate is designed above the drying chamber and directly connected to the ground through the column, that is, the drying chamber 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

The natural gas radiant heating paint drying room adopts the international new type roller shutter door, which has good thermal insulation and strong bending resistance to prevent the occurrence of condensed water; 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)

Hot air circulation heating system

It is composed of imported gas burner, heat exchanger, catalyst infrared heater, insulation box, temperature control system, pipeline and other parts

Gas burnerAir heat exchangerNatural gas catalyst infrared heaterCirculating fanAir supply and return pipes

In order to ensure the adhesion between the paint film and the workpiece substrate in winter, the natural gas radiation heating paint drying room usually requires that its 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

SUS304 and SUS304 are adopted for the inner tank of heat exchanger δ 4mm stainless steel is made by argon arc welding. The two process heat exchange design structure of the whole machine is reasonable, the heat exchange area is large, and the heat exchange efficiency is high. At the same time, it is equipped with an air pressure switch to effectively monitor the system operation. When there is no circulating air in the system, the burner is immediately cut off and the heating is stopped. So as to ensure the safe and reliable operation of the equipment

It can be divided into air circulation version, air pressure version and low-power version. Compared with the infrared curing using electricity as energy, the operating cost of natural gas catalyst infrared radiation curing equipment is lower, and the operating cost is only about 1 / 3 of the cost of electric infrared. Compared with the traditional natural gas hot air circulation furnace, the energy consumption of some workpieces using natural gas catalyst infrared radiation is only about 20% at most; Long service life, generally between 25000 and 80000 hours, usually without cumbersome maintenance; After years of use, the catalytic layer can be reused after reprocessing to reduce the use cost.

The fan adopts double suction bkkf / bydw / b4-82 explosion-proof centrifugal fan with good performance, high efficiency, beautiful appearance, compact structure, stable operation and convenient installation; The frame is welded with channel steel and angle steel to ensure its bearing capacity; Air supply pipes are all made of δ 1.2mm high-quality galvanized steel plate is made of bite, and 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 set to ensure that the system noise is controlled below 75dBA

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.

Workpiece induction deviceHigh temperature resistant filterAir curtain systemTemperature control systemSafety detection system

A set of workpiece induction device is installed at the inlet of the oven. When the conventional workpiece passes through, the infrared radiation can turn on about 50% of the power to meet the temperature rise requirements. If there is an unconventional workpiece (i.e. the size is too small) and it is too far away from the radiation panel, the induction device can send a signal in advance. Before the workpiece reaches the designated station, the output power of the radiation panel is increased in advance, and the temperature of the surface paint is detected with the temperature resistant infrared thermometer in the oven, The output power of the panel can be automatically adjusted to ensure that the paint temperature on the surface of the workpiece is 80 ° C ± 5 ° C

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.

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 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.

The heating system is equipped with an air pressure switch. When no air is detected, the control signal will be sent immediately to cut off the heater and stop the operation to avoid the occurrence of "dry burning".

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 treatment methods commonly used in the natural gas radiation 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.


Natural gas radiant heating paint drying room < / span > the upper and lower rows of lighting devices are set in the 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.















天然气消耗量9-35.8 m3/h



风量1131 m3/h












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