In the manufacturing process of glass lined reactor, a large number of internal stresses will be generated due to drum, stamping, welding and other processes. These stresses should be eliminated by heat treatment before enamel firing bottom glaze, so as to reduce the number of enamel firing and ensure the production efficiency of glass lined equipment. Lining silica glass for reaction pot equipment shall be carried out in accordance with process specifications.
1. The thickness of the enamel layer of the glass lined reactor is specified to be 0.8-2mm, and the number of enamel firing should be 5-7 times. The thickness of porcelain layer is generally about 1mm. It depends on the use requirements. If heat transfer is considered, the enamel layer should be thinner. When the medium used without heat transfer is seriously corroded, the enamel layer should be thicker. To achieve the specified porcelain thickness, the surface glaze on the product should be sprayed and enameled for many times. The thickness of each pass should be thinner. However, considering the production efficiency, it should not be too thin. Generally, it is better to control the thickness increase of 0.2mm per pass.
2. In order to ensure the quality of enamel firing, the enamel surface shall be inspected every time it is sprayed. Check whether there are dark bubbles and pinholes on the porcelain surface. Once found, it shall be polished and repaired. The pinholes and dark bubbles that pass through the metal surface shall be ground and dug, or even repaired by welding. Where the bottom metal is repaired, the bottom glaze needs to be sprayed. The above repair procedures need to be mastered by each spraying and lining operator.
3. In addition to annealing, the stress generated during the manufacturing process of the equipment shall be kept for at least 15 days after the equipment is enamelled. The finished equipment can be delivered only if there is no porcelain explosion during the standing period.
It should be added that the reduction of enamel firing times is completed on the premise of meeting the technical requirements. Many enterprises increase the thickness of each glaze spraying in order to reduce the enamel firing times during production. In this way, during enamel firing, the glass layer is prone to problems such as incomplete burning and overlapping. The corrosion resistance of the glass lining layer cannot be guaranteed, and the combination between layers is not good, which is easy to explode. Therefore, the operation must be carried out in accordance with the enamel process specification.