Reasons for leakage in graphite heat exchangers and solutions

Around us, environmental protection equipment is becoming increasingly prevalent due to the escalating pollution caused by production. The advent of such equipment has brought considerable convenience and efficiency to our lives. It is imperative to acknowledge that graphite possesses numerous unique characteristics, particularly in purification, where it plays a pivotal role. The five-ink heat exchanger stands as one of the commonly utilized graphite devices. When installing it, certain precautions must be taken, as incorrect installation can easily cause damage. The installation location requirements are as follows: the graphite heat exchanger should be placed on a support that meets height requirements and should be reliably balanced. Additionally, a drain valve should be installed to prevent draining during shutdown and to avoid accidents. Nut installation: tighten the main bolts to press them against each other, achieving sealing. The sealing surface should be specially cared for. When tightening the main bolts, do not exceed the specified tightening torque to restore good sealing performance. When tightening the bolts, it is necessary to gradually tighten them in multiple steps, diagonally and symmetrically, applying even force and avoiding tilting to one side to achieve good sealing effect. Bolts may become loose after transportation and moving, so it is essential to carefully inspect and adjust the equipment before installation.

With the rapid improvement of production levels, more and more new materials have begun to appear in our production. Many materials possess their own unique characteristics, which are utilized in our production and yield highly effective results. Graphite should be familiar to everyone. It is present in many devices and materials. A graphite heat exchanger is a device used for processing graphite materials. Its emergence has met the market demand for graphite. However, if it malfunctions, it can greatly affect the properties of graphite. When there is a problem with the intermingling of two-phase media, the first thing to check is whether there is a quality issue with the graphite. Then, check whether the adhesive of the graphite heat exchanger is normal, and whether there is any dissolution, aging, or deterioration. The impact force during startup may come from thermal shock or water hammer. Solutions: If there is a quality issue, replacement is necessary; if the adhesive needs reapplication, the impact force should be balanced, and drainage should be carried out in advance. The fracture of graphite tubes may be caused by issues during startup or stopping the equipment feeding speed. Graphite heat exchanger manufacturers' solutions: ensure smooth operation. If the system experiences significant vibration, material flow may be obstructed, leading to unstable operation. Solutions: Adjust the balance between material and system operation before running. As long as the problem is identified, it is easy to solve the malfunctions of the graphite heat exchanger. Correctly address and resolve the issues.

Graphite, as a material, possesses excellent properties, which is why process equipment based on graphite is widely used in our daily lives. Graphite heat exchangers, as one such type, are highly favored. They exhibit good corrosion resistance, have a heat transfer surface that is resistant to scaling, and demonstrate excellent heat transfer performance. However, graphite is prone to cracking and has low bending and tensile strength, making it suitable only for low pressure applications. Even with its porous structure capable of withstanding pressure, its working pressure is generally limited to 0.3 to 0.5 MPa. Graphite heat exchangers are costly and bulky, thus not widely used. They are primarily employed for heat exchange with corrosive media such as hydrochloric acid, sulfuric acid, acetic acid, and phosphoric acid, serving as condensers for mixtures containing acetic acid. Generally, there are three main reasons for leaks in graphite heat exchangers. The issue may arise in the phenolic graphite pressure-molded tube itself. When cracks, roughness, or sand holes are detected on the tube, the problem can be pinpointed. These surface defects lead to poor tube quality, which, under various external pressures during operation, can result in the tube failing to function properly and leaking.