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Site: Anshan Iron and steel plant

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No. 111 Sheng Lu


Heating strength and production capacity of third sections of zinc pot

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When heating a zinc pot, the heat provided is mainly used to heat the galvanized parts, hoisting tools, compensate for the heat dissipation of the zinc bath surface and the hot galvanizing furnace. The heating intensity of the zinc pot is not only related to whether the normal working temperature of the zinc bath can be maintained, but also an important factor determining the life of the zinc pot. The heating strength of the zinc pot wall should not exceed 24kw/. Especially, the limit value of heating intensity mentioned here is not only the limit of the average heating intensity of the whole wall of the zinc pot, but also the limit of each local heating intensity of the wall of the zinc pot. Local over-corrosion of many zinc pots is not caused by the material of the pot, but by the local overheating. At the inner wall of the zinc pot where local overcorrosion occurs, the actual temperature reaches the high-speed dissolution temperature of iron in zinc solution. At this temperature, the Fe-Zn alloy layer which plays a protective role breaks down and falls off, the diffusion reaction between iron and zinc is accelerated, and the corrosion of the inner wall of the zinc pot is accelerated. Local overheating may be caused by uneven heating. The causes of uneven heating can be found from the structure of the hot-dip galvanizing furnace, the design and operation of the heating system, etc. In addition, excessive accumulation of zinc slag at the bottom of the pot or zinc ash on the surface of the pot is often an important cause of uneven heating. The free convection of zinc liquid is blocked at the dead corner where the ash accumulates, and the heat transferred from the heat source can not be quickly carried away by the convection of zinc liquid, which leads to the temperature rise of the inner wall of the zinc pot in these places and causes local overheating.

When the steel structure is put into the zinc pot, the temperature of the zinc liquid will rise when the component absorbs the heat of the zinc liquid. The heat provided by the cooling of the zinc liquid is balanced with the heat absorbed by the components. In order to keep the zinc bath temperature at normal galvanizing temperature, the zinc bath in the zinc pot must have sufficient heat capacity, that is, the zinc pot must have sufficient zinc capacity. Generally speaking, the capacity of zinc pot should be 30-40 times more than the weight of the components put into zinc liquid per hour; that is to say, the production capacity of zinc pot should not exceed 1/30-1/40 of the capacity of zinc pot in terms of output per hour.