What should be noticed during operation in order to extend the life of primary reforming catalyst?

The factors affecting the catalyst service life in operation mainly come from the over-temperature or local overheating of the furnace tube caused by human operation and equipment design defects, as well as the high water to carbon ratio, which will accelerate the melting of a section of the primary reforming catalyst and make the Ni grains grow up. According to practice, the following problems need to be noted in the operation are summarized.

(1) For the furnace air disturbance may occur at the top of the burner flame lick furnace tube caused by local overheating problems, should be adjusted in a timely manner burner root valve openings, and by changing the duct baffle openings to reduce the disturbance of the airflow in the mouth of the trumpet.

(2) A section of the furnace tube row design, by the furnace wall of the tube row of one side of the heat is serious (furnace wall of the tube row of heat radiation), easy to cause the furnace tube bending, resistance increases, uneven distribution of airflow, which leads to localized over-temperature of the tube row. For this situation, should be by the furnace wall pipe row of the inlet air duct baffle closed small, while reducing the corresponding burner fuel gas volume, in order to balance the heat on both sides of the pipe row.

(3) Due to the device itself there are design defects (such as a section of the furnace chamber is small, the number of stove pipe is small, etc.), resulting in a section of the furnace combustion releases excess heat, when the high-temperature spent gas into the vortex will be formed, resulting in the conversion of the pipe at the bottom of the pipe (into the flue before the part of the pipe rows to form a high-temperature zone. In this regard, the following measures can be taken: increase the amount of fresh air; the excess of spent gas appropriate venting; strictly control the temperature into the chamber <380 ℃; close the top of the high-temperature area of the burner root valve, while shutting down the 1/2 single-sided suction pipe exhaust duct baffle; strengthen the residual oxygen analysis.

(4) Try to increase the inlet temperature of a section of the furnace to reduce the temperature of the pipe wall.

(5) In addition to open and stop the control of higher water-carbon ratio, usually normal production, should not accumulate carbon under the premise of the water-carbon ratio control to lower, in order to slow down the melting of a section of the conversion catalyst.