Heating requirements for the reactor in the hydrogenation unit
Thread Content
The heating of the cold reactor in the hydrogenation unit must comply with the temperature rise limits for the reactor; that is, until the temperature at the lowest point of the reactor and the heat exchanger is below 93°C, the rate of temperature increase must be kept at less than 10°C/h, and the inlet temperature of the reactor shall not exceed 167°C above the lowest surface temperature. Why is this requirement? Solve
Is there any requirement for pressure before this temperature?
MTP, maximum temperature and pressure. Indicators that are considered only when starting or stopping operations. When the surface temperature of the reactor has not reached 93 degrees Celsius – and this applies to all points on the reactor’s surface – the pressure must not exceed 3 MPa; otherwise, it will cause damage to the reactor. Pressure is limited by temperature, but temperature is not limited by pressure. . It is to prevent stress from exceeding the yield strength; cold materials have less elasticity, right?
It is mainly affected by the reactor material! Under such conditions for a long time! It causes severe corrosion to the equipment!
The requirements regarding temper brittleness should be taken into consideration.
Is it determined based on the design pressure? It shouldn’t be directly 3.0 MPa
Yes, until the temperature reaches the required level, it should not exceed one quarter of the total pressure
According to the requirements regarding temper brittleness, the pressure must not exceed 3 MPa
To prevent cracking due to temper embrittlement, for the start-up and shutdown of normal equipment, it is required to \"raise the temperature first before increasing the pressure, and reduce the pressure first before lowering the temperature.\"