Transformation heating rate
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What are the requirements for the heating rate of conversion during the startup of the sulfuric acid system? Does the fact that foreign catalysts are not sensitive to the heating rate mean that there is no need to control the heating rate for conversion?
The sulfuric acid production technology P607 specifies that the temperature rise per hour should not exceed 30 degrees per hour; it may be necessary to consider not only the catalyst issue but also the thermal expansion and contraction of the equipment.
Firstly, the heating rate of catalysts, whether domestically or abroad, must be strictly controlled; generally, the rate of temperature increase or decrease during startup and shutdown is 20~30 degrees
Generally, for heating the transformation system, before 300 degrees, the heating rate is 20 degrees per hour; after 300 degrees, the heating rate is 10–15 degrees per hour. Additionally, if heating is done using an electric furnace, and the interior of such a furnace is divided into several smaller furnaces, the two smaller furnaces should be turned on with a delay of 10–20 minutes between them; they cannot be started simultaneously. These are my personal opinions; please feel free to correct me.
The temperature rise curve should be plotted before driving the vehicle; otherwise, both the catalyst and the equipment will be affected
Strictly control the air-oil ratio, or the electric furnace load, in accordance with the heating rate. Prevent leaks, reduce pollution, and cut down on unnecessary material consumption.
For a new system, the warming-up time is 48 hours, while it can be 36 hours after a major overhaul.
7# wjm8261 [/b If diesel is used to raise the temperature to below 100 degrees, it is necessary to do so quickly in order to prevent water vapor from condensing; this method of heating has always been subject to controversy. When an electric heater is used and the air is dried with 93% acid, the temperature should be increased at a rate of 20-30 degrees per hour
For imported catalysts with a bulk density of less than 400, it is better to control the heating rate slowly; otherwise, it will lead to increased catalyst pulverization and greater screening losses.
Generally, when raising the temperature in a transformation system, before 300 degrees, the rate of temperature increase is 20–30 degrees per hour; after 300 degrees, the rate is 10–20 degrees per hour.
Does the temperature rise when starting the engine after maintenance on the old system need to be controlled so strictly as well? Suggestions on domestic catalyst 101