Let’s take a look at this phenomenon
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For a 200kt/a sulfuric acid production system at a company in Guizhou, maintenance was carried out from January 6, 2016, to [date]. The temperatures in the conversion process after the system was restarted are shown in the table below:Inlet (°C) Exit (°C) Stage 1 411 411 566 569 Stage 2 472 474 501 501 Stage 3 419 424 421 425 Stage 4 392 389 400 400 Stage 5 382 382 418 424 Please check what the situation is
Hehe, I’m not very knowledgeable, so I can’t see much. It seems that the gas concentration isn’t high. Also, it doesn’t seem like there’s any reaction in section 3 – could it be that the inlet temperature is too low?
The bypass valves for the two-stage exchange are fully open; the inlet temperature at stage 3 cannot rise, and the temperature difference at stage 5 is high
This post was last edited by “Fish in Love with Cats” on April 10, 2016, at 16:09. In my opinion: Generally speaking, the temperature difference between the fourth and fifth stages of the two-stage reaction in a “3+2” process is very small (only a few degrees of variation; most of the temperature change occurs during the first stage of the reaction; in particular, there’s almost no temperature change during the fifth stage). The inlet temperature for the second stage is too high 【although this helps to increase the reaction rate, it’s detrimental to the equilibrium conversion rate】. If the temperature in stage 3 is too low, it will result in a low temperature in stage 4 as well, preventing an increase in temperature (although for the low-temperature catalysts used in stages 3, 4, and 5, it would be better to find a way – through some auxiliary process modifications – to keep the temperature in stage 3 above 440°C and that in stages 4 and 5 above 420°C; we should give this a try). That’s my personal opinion
Don’t paragraphs 4 and 5 respond? Is the exhaust gas concentration very high?
The sulfur combustion furnace shows 1043 degrees at 2 o’clock; the analyzed sulfur dioxide concentration is only 8.5%, with a total conversion rate of around 99.6%. The furnace temperature cannot be increased either.
The inlet temperatures of each section during conversion are relatively low
With a temperature of 1043, the gas concentration must be high; so how is the conversion temperature difference not at least 200, given that the conversion rate here is 99%. 6, that’s impossible. There must be a problem on one side; the furnace temperature doesn’t seem right, otherwise the conversion rate would be terrible
Hehe, I remember now – it’s possible that all the data is correct. If there is cold air flow in a certain section, it’s necessary to check that valve carefully; it’s possible that its leakage rate is too high.
Different catalyst manufacturers result in different requirements for controlling inlet and outlet temperatures. I’m not sure what conversion rate corresponds to the conversion temperature you provided