Problems with the operation of the Texaco gasifier; please have experts provide an analysis
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The Texaco gasifier used in my workshop uses heavy oil as raw material, not coal. Currently, the operating pressure difference of the gasifier is on the high side. According to the analysis data, the methane content in the gas produced by the gasifier is low, while the carbon dioxide content is high (only slightly so). The temperature inside the gasifier is indicated to be low, with all other parameters being normal. When the pressure difference in the gasifier increases, opening the oxygen valve can, to some extent, alleviate this issue; however, after conditions return to normal, the pressure difference gradually rises again. Please ask an expert to analyze it; we’ve tried to analyze it on our own but haven’t reached a definite conclusion, as our findings are always contradictory.
The reaction in the gasifier can be approximated as an adiabatic process. According to the law of conservation of energy, the work done by the gas on the furnace walls is equal to the internal energy consumed. A decrease in methane content may lead to an increase in the specific heat of the mixture.
The specific heat of the mixed gas increases, and the magnitude of the temperature rise naturally decreases; therefore, the temperature drops.
As for the increased pressure, it may be because carbon dioxide is more difficult to compress than methane, which leads to an increase in the mixed compression factor and thus a higher pressure difference.
The pressure difference I’m referring to is the difference between the pressure of the feedstock entering the gasifier and the pressure of the gas exiting it. From this, we can see that there are three reasons for a large pressure difference； One scenario is that the feed pressure remains unchanged while the gas pressure in the gasification furnace decreases ； The other case is that the feed pressure rises while the pressure of the vaporized gas remains unchanged ； The third scenario is an increase in feed pressure accompanied by a decrease in the gas pressure inside the gasifier. The current situation in our workshop is the second type. The pressure of the gas exiting the gasifier is automatically controlled by a control valve; there is no problem with low pressure. At present, we have confirmed that the feed pipeline of the gasifier is unobstructed and the pressure of the gas exiting the gasifier is stable. We suspect that there is a blockage somewhere within the internal passages of the gasifier, which causes an increase in pressure inside the gasifier; this in turn leads to an increase in feed pressure and thus an increase in the pressure difference. The measure we’re currently taking is to fully open the oxygen valve. This measure serves to raise the temperature inside the gasifier; it indicates that the blockages within the gasifier are being melted by the high temperature and then flowing into the ash tank. However, why does the pressure difference continue to gradually increase even after the oxygen valve returns to its normal state? Also, could it be related to the burner of the gasification furnace? What are the symptoms if the burner is damaged? Looking for experts. . . (The burners in my workshop are two-channel burners; oil flows through the outer channel, while oxygen flows through the inner channel.)
That should be caused by carbon deposition reactions inside the vaporization furnace.
If it is caused by carbon buildup, the problem can be significantly alleviated by increasing the oxygen supply; the pressure difference will not increase just because the oxygen valve returns to normal
Check if there’s anything wrong with your pressure gauge A similar situation occurred in our factory, and as a result, problems appeared with the meters
What type are your heavy oil flow meters? ?