Causes and effects of excessive pressure difference between the inlet and outlet of the reformer
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What are the causes and effects of excessively high pressure difference between the inlet and outlet of the reformer?
1. The catalyst is pulverized. It is possible that the temperature rises and falls too fast or the pressure rises and falls too fast, or the steam carries water when the temperature rises. 2. Large load and large gas flow cause large pressure difference in the reformer.
The main cause of increased resistance is the catalyst. If the catalyst is over-temperature and agglomerates, the channel will become smaller. Another situation is that the lining material of the reformer is not up to standard, and silicon is released at high temperatures and adheres to the tube sheet at the entrance of the waste pot, causing the channel to become smaller. In addition, if the spherical arch at the lower part of the reformer collapses, the catalyst will fall down and block the lower head, causing increased resistance. This situation occurs, but is rare. There is also the alumina ball in the reformer. The aluminum oxide content should be above 98%. If the wrong choice is made, it will sinter and stick together at high temperatures, thus increasing the resistance.
1. It may be that the catalyst is pulverized and the pipes are blocked. 2. Only a certain amount of gas can pass through the heat exchanger due to the circulating gas volume, and the excess will cause air blockage. 3. If the temperature is too high, the catalyst will sinter and block the heat exchange tube.
Additional points: 1. Carbon deposits. 2. Thermal "bridging" during operation. The downtube had red spots and even overheated and bent. The previous treatment was to hit and vibrate the earring with a wooden hammer, and it was cured.
It is possible that less steam is added to the coke oven gas, causing the catalyst to decarbonize, resulting in a decrease in the methane conversion rate and an increase in the corresponding pressure difference. The disadvantage is that the outlet methane is high and the temperature of the reformer must be increased. The synthesis reaction is not good.