Purification Technology Q&A [024]
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What are the factors that affect the lifespan of conversion catalysts? Answer: 1) Prolonged overheating of the catalyst causes it to break down due to fluctuations. 2) Semi-water gas carries oil and water, resulting in salt formation on its surface. 3) Overload operation. 4) Poisoning of the medium-temperature catalyst due to excessive hydrogen sulfide levels. 5) The water quality in the saturated tower exceeds the standards. (Total water solids, calcium and magnesium ions, conductivity, chloride ions). 6) The temperature control of the low-temperature catalyst is low, a large amount of steam is added, resulting in sulfur loss. 7) Medium-temperature catalyst at high temperature; steam supply interrupted ； A large amount of low-temperature steam added causes side reactions. 8) Initial heating during driving leads to incomplete vulcanization. 9) The passivation scheme is unscientific, and as a result the heating rate is also unscientific. Coalification Region Purification Technology Edition – 2017 Coal Chemical Industry “My Technical Upgrades” Contest (Generous Prizes Available) http://bbs.hcbbs.com/thread-1786290-1-1.html Registration for Chemical Engineers – Experience Sharing Event “Learning from Others’ Experiences” http://bbs.hcbbs.com/thread-1808158-1-1.html
There are many reasons that cause a decline in catalyst efficiency and shorten its lifespan; the main ones include: the toxic effect of impurities in the raw materials (also known as catalyst poisoning)； The thermal effects at high temperatures cause the grains of the active components in the catalyst to grow larger, which leads to a decrease in the specific surface area, or it may result in the degradation of the catalyst ； Dust in the reaction materials or carbon deposits formed during the reaction process covered the surface of the catalysts; (the black particles are nickel, while the thread-like substances are carbon deposits) ； The active components in the catalyst are lost during the reaction process ； Intense thermal shock or pressure fluctuations cause the catalyst particles to break apart ； The scouring of the reaction stream causes the catalyst to become pulverized and be blown away, etc
Inlet gas temperature, pressure difference between inlet and outlet, start-up and shutdown operations, etc
Thermal stability, oil-water activity, ceramic ball packing, catalyst packing, heating reduction, etc
1) Prolonged overheating of the catalyst causes it to crack due to temperature fluctuations. 2) Semi-water gas carries oil and water, resulting in salt formation on its surface. 3) Overload operation. 4) Poisoning of the medium-temperature catalyst due to excessive hydrogen sulfide levels. 5) The water quality in the saturated tower exceeds the standards. 6) The temperature control of the low-temperature catalyst is low, a large amount of steam is added, resulting in sulfur loss. 7) Medium-temperature catalyst at high temperature; steam supply interrupted ； A large amount of low-temperature steam added causes side reactions. 8) Initial heating during driving leads to incomplete vulcanization. 9) The passivation scheme is unscientific, and as a result the heating rate is also unscientific.
Inlet gas temperature, pressure difference between inlet and outlet, start-up and shutdown operations, etc
1. Thermal stability. 2. Oil-water activity. 3. Filling with ceramic balls. 4. Catalyst loading. 5. Temperature rise reduction.
There are many reasons that cause a decline in catalyst efficiency and shorten its lifespan; the main ones include: the toxic effect of impurities in the raw materials (also known as catalyst poisoning)； The thermal effects at high temperatures cause the grains of the active components in the catalyst to grow larger, which leads to a decrease in the specific surface area, or it may result in the degradation of the catalyst ； Dust in the reaction materials or carbon deposits formed during the reaction process covered the surface of the catalysts; (the black particles are nickel, while the thread-like substances are carbon deposits) ； The active components in the catalyst are lost during the reaction process ； Intense thermal shock or pressure fluctuations cause the catalyst particles to break apart ； The scouring of the reaction stream causes the catalyst to become pulverized and be blown away, etc
Temperature, pressure, impurities in the feed gas (such as coal ash and dust), water, composition of raw gas
1) Prolonged overheating of the catalyst causes it to crack due to temperature fluctuations. 2) Semi-water gas carries oil and water, resulting in salt formation on its surface. 3) Overload operation. 4) Poisoning of the medium-temperature catalyst due to excessive hydrogen sulfide levels. 5) The water quality in the saturated tower exceeds the standards. (Total water solids, calcium and magnesium ions, conductivity, chloride ions). 6) The temperature control of the low-temperature catalyst is low, a large amount of steam is added, resulting in sulfur loss. 7) Medium-temperature catalyst at high temperature; steam supply interrupted ； A large amount of low-temperature steam added causes side reactions. 8) Initial heating during driving leads to incomplete vulcanization. 9) The passivation scheme is unscientific, and as a result the heating rate is also unscientific.