Although the shell-and-tube condenser has many advantages over traditional condensing equipment, it is also prone to problems such as excessive pressure drop, which leads to a series of adverse consequences. It is not difficult to solve this problem of tube-and-tube condensers, but it needs to be comprehensively treated from various aspects. On the one hand, the use of circulating water, especially the secondary circulating water, must use softened soft water as the secondary circulating water of the tubular condenser, so that the impurity content in the water can be controlled not to exceed the standard and ensure its purity. .
On the other hand, for the application of the tube and the condenser to the central heating system, the method of replenishing water for the second time can be used. It is also important to regularly remove contamination in the flow passages of the tubular condenser or fouling on the plates.
When cleaning the scale on the surface of the plate in the tubular condenser, the solution containing sulfamic acid or the nitric acid solution containing urotropine, aniline and thiocyanate can be used as the cleaning solution, and the cleaning temperature is controlled at 40℃- 60℃, neither too high nor too low.
If chemical immersion cleaning is performed without dismantling the tubular condenser, it is necessary to open its cold medium inlet and outlet first, or install cleaning ports on the medium inlet and outlet pipes when installing the equipment, and clean the prepared liquid into the device.
However, it is much simpler to disassemble and clean. Soak the plates of the tubular condenser in the cleaning solution for 30 minutes, then use a soft brush to lightly brush the scale, and then clean it with clean water. During the cleaning process, damage to the plates and the plates should be avoided. Rubber mat.
Correct selection of the welding process of the condenser is an important factor in ensuring quality.In addition to considering the selection of welding methods, electrodes, welding positions, transportation conditions, etc., preheating before welding and post-welding heat treatment are also considered. Whether preheating is required and its temperature and method should be determined according to the properties of metal materials and preheating conditions. In order to prevent welding deformation and reduce residual stress, the two ends of each pipe are spot welded to the tube sheet in sequence, and each pipe needs to be spot welded with evenly distributed points before welding. The number of divided areas depends on the diameter of the tube sheet, and the large tube sheet can be divided into several areas.
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