What are the applicable scenarios of stainless steel welded air duct in the environmental protection ventilation project of furniture factory?

Applicable Scenarios of Stainless Steel Welded Duct in Environmental Protection Ventilation Engineering of Furniture Factory

The working conditions of furniture production workshops are quite different, including grinding dust, spray paint fog, paint mixing exhaust gas, drying exhaust gas, sawdust transportation and other different types of exhaust gas. The temperature and humidity, medium corrosiveness and dust concentration in different areas are different. The cost of stainless steel welded air ducts is higher than that of galvanized air ducts. Generally, it is preferred to be used in sections with complex medium, strong corrosiveness, high negative pressure and high safety requirements. It is not necessary for all air ducts in the whole plant to be made of stainless steel, which is explained in detail in the following scenarios.

First, the exhaust gas collection pipeline in the painting room and paint mixing room. This is the most recommended area for furniture factory to use stainless steel welded air duct. Paint mist, thinner, resin particles and VOC organic waste gas will be produced during painting operation. The waste gas contains organic solvents, and paint residue is attached to the inner wall of the pipeline for a long time, and the air humidity is high. After the common galvanized air duct comes into contact with paint mist and organic solvent, the galvanized layer is quickly corroded and peeled, and the pipe wall is corroded and perforated, resulting in waste gas leakage and unorganized emission, which can not meet the environmental protection requirements stably. The inner wall of stainless steel welded air duct is smooth, resistant to organic solvents, moisture and corrosion, and the continuous welded structure has good sealing performance, and there is no air leakage during negative pressure operation, which can stably collect paint mist and VOC waste gas. Paint is not easy to hang on the inner wall, which is convenient for regular high-pressure cleaning, prevents paint residue from accumulating, and reduces the risk of pipeline fire. The branch pipe and main pipe of the gas collecting hood in the painting room and the exhaust gas conveying pipeline leading to the spray tower and activated carbon adsorption box are all suitable for selection.

Second, the dust removal main pipe and branch pipeline of high concentration sawdust in grinding section. Furniture polishing will produce a lot of wood fiber dust, which belongs to flammable dust and has the safety risk of dust explosion. This kind of dust removal system is operated under negative pressure, which requires high strength and tightness of air duct. The stainless steel welded air duct is integrally welded and formed, and there is no bite gap, so that there will be no bite crack and dust leakage, and the secondary dust in the workshop will be avoided due to dust leakage. The inner wall is smooth without unevenness, and wood fibers are not easy to hang on the wall and accumulate, thus reducing the hidden danger of dust accumulation. At the same time, the pipeline has strong anti-negative pressure collapse ability, and the long-distance and large-diameter dust removal main pipe, elbow, tee joint and reducer are easy to wear pipe fittings, so stainless steel welded air duct is preferred. Especially, the main pipeline collected by sander and grinding table has high dust velocity, great erosion and wear, better wear resistance of stainless steel and longer service life.

Third, the drying room, drying room high temperature waste gas pipeline. The drying and drying process of furniture after spraying will produce high-temperature waste gas with solvent, and the pipeline will be in a high temperature environment for a long time, accompanied by organic volatiles. The galvanized layer of common galvanized air duct is easy to fail and fall off in high temperature environment and corrode quickly. Stainless steel has good high-temperature resistance, stable structure under high-temperature working conditions, and the weld is not easy to fail. It can withstand thermal expansion and cold contraction caused by the temperature change of drying waste gas, and there will be no problems of joint cracking and waste gas leakage. At the same time, it is difficult to clean up the paint accumulated in the high-temperature pipeline, and the stainless steel pipe wall is not easy to be corroded by high-temperature organic media, so as to ensure that the waste gas is continuously transported to the back-end environmental protection treatment equipment.

Fourthly, concealed laying of air ducts in wet areas of workshops, underground and suspended ceilings. In some areas of the furniture workshop, the air humidity near the water washing and dust removal and spraying system is extremely high, and the ground washing water vapor is large, and a large number of air ducts are arranged in hidden positions such as ceiling, mezzanine and underground pipe gallery. It is difficult to repair this kind of pipeline in the later stage. Once it is corroded and damaged, it is necessary to stop production for disassembly and replacement, and the construction cost is high. Stainless steel welded air duct is resistant to moisture and corrosion, and has long service life. After concealed installation, it can run stably for a long time, reducing the workload of later maintenance and replacement, and avoiding sudden environmental accidents due to pipeline damage.

Fifth, the pipeline in the dust explosion-proof area with high safety requirements. Wood dust belongs to combustible dust. According to the dust explosion-proof code, there can be no dust accumulation in the dust removal pipeline, and wood dust is easily accumulated in the groove of the bite duct, which poses a safety hazard. The inner wall of stainless steel full-welded air duct is flat and has no bite groove, so it is not easy to accumulate dust and reduce the risk of spontaneous combustion and explosion. For the centralized dust removal system of multiple grinding equipment and the large-diameter negative pressure dust removal main pipe, the explosion-proof requirements are high, and it is suitable to use stainless steel welded air ducts. In addition, pipe fittings such as elbow and tee, which are washed by dust at high speed, are the most seriously worn, so stainless steel can be used alone to prolong the service life of pipe fittings.

Sixth, the waste water spray is matched with the exhaust gas air duct. Spray washing tower is commonly used for waste gas treatment in furniture factory. The waste gas at the outlet of the tower contains water mist, and the water vapor is mixed with a small amount of organic medium, which is highly corrosive. Galvanized air duct is easy to rust in wet waste gas environment, while stainless steel welded air duct is resistant to water vapor corrosion, so it is suitable for being used as wet waste gas conveying pipeline leading to activated carbon box and exhaust pipe at the back end of spray tower, so as to prevent corrosion and perforation of the pipe wall and ensure the discharge of waste gas up to standard.

Inapplicable scenario: Simple fresh air supply in ordinary workshops and short-distance simple exhaust in low-dust dry areas, with clean and non-corrosive medium and low dust concentration. Galvanized air ducts can be used for such pipelines, and stainless steel welded air ducts are not needed to control the investment cost of the project.

To sum up, the core application scenarios of stainless steel welded air duct focus on * * environmental protection ventilation pipeline with organic waste gas containing paint mist, high humidity and high temperature, high concentration of sawdust dust, large negative pressure, high explosion-proof requirements and difficult maintenance in concealed installation * *, aiming at solving the pain points of corrosion, air leakage, dust accumulation and safety in the treatment of waste gas and dust in furniture factory, and cooperating with the back-end environmental protection equipment to run stably up to standard.