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How to extend the service life of graphite cooler
Release time:
2022-03-11
At present, domestic chlor-alkali enterprises commonly use steel synthesis furnace or two-in-one graphite synthesis furnace to synthesize hydrochloric acid. There are one or two graphite coolers behind the synthesis furnace. Although the structure is different, there are tubes, plug holes and so on. But most of the materials are the same, both are opaque graphite.
At present, domestic chlor-alkali enterprises commonly use steel synthesis furnace or two-in-one graphite synthesis furnace to synthesize hydrochloric acid. There are one or two graphite coolers behind the synthesis furnace. Although the structure is different, there are tubes, plug holes and so on. But most of the material is the same, are opaque graphite. The exit temperature of the synthesis furnace is generally between 450-500°C. It is cooled by chlorination . Hydrogen tube cooling, generally down to about 130 ℃. Then into the graphite cooler, indirect cooling to 40-50 ℃, and then absorb hydrochloric acid. Therefore, graphite cooler is an important equipment for industrial synthesis of hydrochloric acid. Its service life directly affects the stability, safety and economic benefits of production.
First of all, since the graphite cooler is made of graphite, its service temperature is limited to below 130℃, otherwise the service life will be greatly shortened. However, when the temperature is too low, as low as chlorinated . Hydrogen dew point 108.65 ℃, the chloride . Hydrogen gas will condense into hydrochloric acid and corrode the pipes between the synthesis furnace and the cooler, Fe+2HC1FeCl2+H2.Meanwhile, if the operation is not proper, the chlorides generated by 2Fe+3CL2=2FeCL3 will block the pipes and graphite tubes of the graphite cooler. Another main reason is the quality of the graphite cooler itself. For example, the quality of the inner graphite tube, the quality of the bond between the graphite plate and the pipe. Poor quality graphite tubes are prone to cracking when in use, leading to cascading of the piping to the shell. Poor attachment of the ceiling to the pipe will damage the casing flange or even the whole casing, directly affecting the chlorinated . Hydrogen cooling service life.
According to years of production practice, graphite cooler tube can solve the graphite cooler inlet temperature problem. However, if the distance between the synthesis furnace and the cooler is determined, the method of multi-branch or front coil can be used. These are effective. The purpose is to increase the high temperature chloride . Hydrogen gas and air heat exchange time and space, in order to meet the temperature required by the process, but also be careful that the temperature is not too low. We have this lesson. At first we used the serpentine tube of the front piping many times, but after the seasonal cooling, the temperature into the cooler is close to the chloride . Hydrogen dew point, hydrochloric acid condensation, resulting in rapid corrosion of the piping. Later, to avoid this phenomenon, we removed one or two serpentine pipes. In other words, while lowering the chlorinated . Hydrogen inlet temperature while weighing the consideration of this or that.
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