Special Technology for Dust Treatment of Dust Precipitator Flue Gas in Sandbox Casting Workshop of Foundry
At present, Chinas environmental protection policy is pushing toward low emission standards. The dust removal structure of the original foundry industry is facing improvement or strengthening. Whether it is a smelting furnace or a casting workshop, targeted treatment of post sewage discharge is carried out to ensure the standardized results of environmental protection requirements.
Because large castings produce harmful smoke and dust during pouring process, open casting can not adopt top suction and dust removal device, resulting in many enterprises do not have a good way to deal with it. Combining with the cases of ground casting and pipeline Casting in many foundries, our factory summarizes the following two efficient schemes, which do not affect the pedestrians. The staffs vision does not affect the large tonnage ladle casting molten steel, but also reduces the cost of common design. At present, it belongs to the development of professional and technical fields, and solves the old casting problem for the foundry industry.
Workshop processing difficulties:
1: Hanging the top obstruction, high cost, abandon the program.
2: Side dust collecting cover, suitable for positioning pipeline use, Living station hoisting type is not easy to use.
3: Influencing the sight of hoisting personnel
4: According to the original plan of the old workshop, the reserved space for casting is not large, and the design of common process pipeline affects the work.
Based on the experience of sand box casting in small, medium, large and large moulds, we choose the following two special treatment schemes.
Solution 1: According to the layout of casting workshop, the size of castings, generally larger castings, and the length of casting line not exceeding 150 meters, track casting can be used to track dust removal.
Tracking and tracing the casting point by track-connecting bellows, positioning and dust removal. With the casting point working at 45 degrees, 45 degrees design principle is designed according to the direction of external exhaust flow of casting pressure circulation inside the sand box, reducing suction, reasonably designing effective wind speed, reducing equipment cost, and avoiding the second place of smaller flue gas in the casting area. Cost management.
How to solve the problem of smoke and dust in sand box on the ground of casting workshop 2: Combining with the site of a railway parts foundry enterprise, the casting is medium-sized casting with 700 kilograms of single piece and 20 tons of lifting bag. Starting from the end of casting, the site area of the casting workshop is small, and it cannot affect the sight of drivers. The effective corridor can not be fully occupied. To consider the comprehensive design cost, in the face of such working conditions, we adopt side circulation independent magnetron pipeline designed according to single sand box or three working stations, main 1 pair of 2 small 3 air flow valves to design three vacuum stations, which solves the problem of the difference between the flue gas and dust treatment intervals in casting and after casting. This design reduces the design cost of air volume, electricity and filters material in the later stage, and also improves the space utilization area. Its operation is all controlled by electronic control system, servo tracking is designed, signal is given to the design according to the traveling speed frequency of the traveling crane, and human consumption is reduced. At present, it is a more professional treatment at home and abroad. Way.
The above two processing processes are completed by our factory, several senior foundry dust removal engineers and several field data analysis. The design data and actual data are sorted out, and the design of equipment and pipeline is basically a special processing technology.