Problems with hydrogen production converters
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This post was last edited by jbcyf on 2012-7-29 at 15:05. The hydrogen production converter has furnace tubes divided into four zones: A, B, C, and D. Why are the temperatures in zones A and B different from those in zones C and D? Increasing the amount of fuel gas has no effect either.
1. Is there any blockage in the top burner, causing uneven combustion? 2. The activity of some catalysts declines, resulting in uneven heat absorption. 3. Some burners are not properly adjusted, resulting in uneven burning. 4. The back pressure of the fuel gas, as well as the primary and secondary air valves, are not properly adjusted. 5. The ventilation volume in the flue is uneven, resulting in an uneven distribution of hot flue gas. The above is just my analysis for reference only.
I’m not sure how your area is divided, but I think one reason is that the temperature at the four corners of the furnace chamber is definitely lower than the temperature in the middle of the chamber; this is normal and easy to understand. Another reason is the uneven flow within the furnace tubes
1. Uneven burning of the burner. 2. Uneven airflow at the dampers. 3. Uneven heat absorption by the catalyst. 4. There is a problem with the thermocouple. We’ve encountered this issue; after making adjustments, the temperature still became abnormal, and this went on several times. Although the problem was not identified, a solution was found: do not force an increase in temperature on the side with the lower temperature. It can be appropriately reduced on the side with the higher temperature. This operation requires external personnel to assist at the top of the furnace. Then, the total amount of fuel gas for lifting the furnace. The temperature difference is back. This operation requires slow movements, and care must be taken at the furnace outlet
This post was last edited by kanleijf on 2012-9-29 at 11:17. There’s a chance to take a look at the burners; they come in different sizes. Generally, the burners installed on both sides are smaller (in terms of the size of the holes at their tips), as they are used to heat a row of furnace tubes. The middle burner is large because it needs to radiate heat to two rows of furnace tubes. . . . Check during the shutdown to see if the small burner has been installed in the AB row; it should be the AD burner that is small and the BC burner that is large
Actually, the second floor’s explanation is quite comprehensive, but I think the two most likely possibilities are as follows: 1. Are the thermocouples installed in the same locations in areas AB and CD? Is there any deviation? If the flame in area AB directly heats the thermocouple while it does not directly heat the thermocouple in area CD, the temperature deviation will be significant; I have encountered similar problems. 2. Another issue is the uneven ventilation of the flue.
First, check if there is a difference in furnace temperature, and then examine the catalyst inside the furnace tubes. Is there any difference in the appearance of the furnace tubes? Things like black tubes, patterned tubes, or speckled surfaces are all related to catalyst issues.
How is the division into ABCD as mentioned by the original poster done? Is it based on the temperature of the furnace wall below the burner? I think the difference in temperature is caused by the following factors ； ①Uneven combustion in the burner, resulting in less combustion, is related to the volume of air supplied and the opening degree of the exhaust valves ； ②The degree of opening of the fuel gas: main burner and pilot light ； ③Catalyst loading: Uneven loading leads to flow bias or channeling ； ④Coking of the furnace tubes leads to reduced catalyst activity and decreased heat absorption capacity, among other issues.