Riveting welding platform | Riveting welding flat plate | Riveting welding assembly platform – Riveting welding platform application in shipbuilding industry – Hebei Jinggong Machine Tool
On the riveting and welding platform in the shipyard, a lot of smoke and dust are generated every day due to welding operations, and the ventilation and dust removal design of many workshops do not meet the standards. Therefore, when faced with the environmental protection acceptance link, an inspection will reveal that the situation is very difficult and the work will be stuck. As for the subsequent rectification costs, it can easily reach hundreds of thousands.
Sources of welding fumes from riveting welding platforms
The main function of the riveting and welding platform is to get things done. These things include the assembly of the hull frame. Also includes the operation of flat panel connection. It also involves the assembly of structural parts. Smoke and dust will be generated during this process.
The main sources are CO2 shielded welding and argon arc welding. The concentration of smoke and dust is very high. The specific value is between 30 and 80 milligrams per cubic meter. This condition far exceeds the designed ventilation capacity. The design ventilation capacity of most workshops is such a standard.
Take a shipyard in Nantong as an example. At this time in 2024, the riveting and welding workshop there emitted an average of almost twelve tons of welding smoke to the outside every year. However, the exhaust volume calculated during the original design was actually only able to cover the needs of half of the number of workstations. Riveting welding platform | riveting flat plate | riveting assembly platform – riveting platform application shipbuilding industry – Hebei Precision Machine Tools. Therefore, the entire workshop was They are always working with concentrations exceeding the standard, which has led to workers constantly making complaints.
Key Parameters for Ventilation System Design
In riveting and welding workshops, the number of air changes is generally 15 to 20 times per hour. The calculation of exhaust air volume requires comprehensive consideration of the number of welding stations, the welding current of each station, and the number of people working at the same time, and cannot simply be estimated based on the area of the workshop.
Regarding the environmental protection requirements for ventilation and dust removal in hull riveting and welding workshops in 2025, a shipyard in Zhoushan has done something. They have increased the number of air changes in the workshop from the original 12 times to 18 times, which is an increase. At the same time, they have also installed exhaust skylights on the roof. After the renovation work is completed, the result is that the concentration of smoke and dust generated by welding inside the workshop has dropped by about 40% on average.
The selection of dust removal equipment should match
The particle size of the smoke generated by welding is mostly in the range of 10 microns to 0.1 microns. When processing, the smoke is usually treated with coated filter cartridge dust removal or pulse bag dust removal. The filtration wind speed must be controlled within the value range of 1.2 meters per second or 1.0 meters per second, because if the control is not good, the service life of the filter bag will be There will be a significant shortening.
There is a local shipyard in Qingdao. This company chose to use a piece of equipment called a pulse bag dust collector at that point in time in 2024. The air volume processed by this equipment is 8,000 cubic meters per hour, and the smoke concentration at the outlet can be stably controlled below 5 mg per cubic meter. This situation fully meets the latest local emission limit requirements.
Local exhaust is more effective than general ventilation
At the top of each welding harvesting station, arrange for the installation of dust removal equipment that inhales downwards or to the side. The distance between the suction inlet and the welding operation point must be strictly controlled within 300 mm. In this way, the collection and cleaning capacity of a single point can reach more than 70%. It is indeed much more effective than relying solely on the rotation of fresh air in the entire factory space.
At a certain shipyard in Dalian, by 2025, they will install 12 mobile welding smoke purifiers on the riveting and welding platform. The air volume of each unit is 1,500 cubic meters per hour. This basically covers the main welding area on the platform. So the effect is quite obvious.
Hard indicators for environmental acceptance
According to the currently implemented air pollutant emission standards, if welding smoke is emitted in an organized manner , the ventilation and dust removal environmental protection requirements of the hull riveting and welding workshop must not exceed 15 mg per cubic meter. If it is an unorganized monitoring point, the concentration cannot exceed 10 mg per cubic meter. Once any item exceeds the above standard value, it will be directly judged as unqualified.
In July 2025, a shipyard in Jiangsu was ordered by the ecological environment department to stop production and make rectifications because the unorganized emission monitoring data in the riveting and welding workshop exceeded the standard. It was also fined 180,000 yuan. During this period of production suspension, the direct loss of output value was about 2 million yuan.
Routine maintenance and records cannot be skipped
The dust filter bags need to be replaced every six months, the fan bearings need to be filled with grease every quarter, and the inner walls of the ventilation ducts must be cleaned of dust at least once a year to prevent the pipelines from becoming clogged and thereby reducing the exhaust air volume.
In the workshop, logs about the operation of ventilation and dust removal equipment must be kept there, and records of replacement of consumables must be kept. In this way, when it comes to the environmental inspection, the ventilation and dust removal environmental protection requirements of the hull riveting and welding workshop can be checked according to the requirements, thereby avoiding being judged as a lack of equipment management, and thus not facing heavier penalties.
Have you ever done ventilation and dust removal renovation work in the riveting and welding workshop of a shipyard? During the acceptance process, what specific situations did you encounter that made you feel awkward? You are welcome to come to the comment area here to talk about these things. If you think these things are useful to you, then please give it a like and forward this content to your colleagues for a look.
暂无评论内容