Can the temperature of a water-coal slurry gasifier be measured externally using an infrared thermometer?
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At the beginning of coal water slurry gasification, two high-temperature thermocouples are generally installed to accurately measure the furnace temperature and guide operations. During the last technical exchange, I heard that each of these thermocouples costs over 10,000 yuan. So I was wondering whether infrared thermometers could be used as a substitute for these disposable items I envision installing several high-end infrared thermometers around the gasification furnace – the kind that can scan in a sweeping pattern and display temperature levels in colors (not ordinary point-type infrared thermometers). Such thermometers can move up, down, left, and right just like a camera, in order to cover a larger scanning area. In this way, it is possible to reduce costs, and temperature measurement can be carried out throughout the entire production cycle, which contributes to production safety.
It seems not possible; it is used to measure the temperature inside the furnace. Material can be fed in when the temperature is between 800 and 1200 degrees, and the temperature measured externally is not the one required for feeding material in. Money isn’t saved by cutting costs; by optimizing the system and increasing production, money is naturally earned
High-temperature thermocouples generally become unusable shortly after the furnace is started up. Many factories do not replace these thermocouples frequently; instead, they rely on the composition of the exhaust gas and the slag discharge to judge the temperature inside the furnace based on experience. The infrared temperature measurement mentioned by the poster is essentially equivalent to the existing systems for measuring the surface temperature of furnaces; however, those systems only monitor the surface temperature of the furnace and are used to assess the condition of the equipment, rather than the reactions taking place inside the furnace.
It won’t work! It is almost impossible to install any infrared thermometer in a pressurized gasifier! ! Infrared thermometers cannot withstand high temperatures and pressures; they can only be installed at normal pressure and in environments with lower temperatures! !
Absolutely not! The cost estimate can’t be much lower either. Moreover, in such an environment, the infrared sensors may be more vulnerable; using them from a distance loses its meaning. It’s still more practical to rely on what’s mentioned on the third floor – by examining the composition of the exhaust gases and the slag discharge – and to judge the temperature inside the furnace based on experience.
This post was last edited by GSP on 2009-9-1 at 17:28. Your idea doesn’t seem to work; thermocouples cost over 10,000 each, so we can use one less of them. Currently, we use one thermocouple for every furnace we have. For the safety of the equipment, management will not take the risk of damaging the furnace just to save 10,000 yuan per cycle. Last year, our plant operated for five or six days with a faulty thermocouple; since there was no backup furnace, the temperature of the furnace wall was measured on-site using infrared sensors every half hour, while the gas composition was monitored from the control room.
It is said that experienced craftsmen can roughly determine the furnace temperature just by taking a look at the slag!
Our company measures the furnace temperature based on the methane output. It is generally controlled at 600–1500 ppm. Slag is sampled and observed twice regularly for each shift. Increase the number of sampling times in special cases.
High-temperature thermocouples do not need to be replaced every time; they are only prone to damage when the temperature becomes too high when the vaporization furnace is not operating properly. Without high-temperature thermocouples, it is not possible to determine the furnace temperature accurately in a timely manner; one thermocouple per time is sufficient.