The temperature inside the slime dryer drum can be controlled in the following ways:

1. Temperature sensor and feedback control: install a temperature sensor in the drum of the slime dryer, monitor the temperature in the drum in real time, and feed back the information to the control system. The control system can automatically adjust the output of the heat source according to the preset temperature setting value, so as to maintain the temperature in the drum within the setting range.

2. Steam or gas flow control: Coal slime dryers usually use steam or gas as a heating source. By controlling the flow of steam or gas, the amount of heat input can be adjusted to control the temperature inside the drum. This can be accomplished by adjusting the valve or using a regulator valve to increase or decrease the supply of the heat source as needed.

3. Air flow control: The slime dryer usually uses hot air to take away the moisture in the drum. By controlling the air flow into the drum, the amount of hot air can be adjusted, which affects the temperature inside the drum. This can be done by adjusting the speed of the fan or by using a damper.

These control methods can be used alone or in combination to achieve precise control of the temperature in the drum of the slime dryer. The specific control strategy and equipment configuration will depend on the design and requirements of the slime dryer.