High pressure reaction kettle is a very important reaction equipment in chemical production. In the chemical production process, it is a device that provides reaction space and reaction conditions for chemical reactions. The installation of high-pressure reaction vessels before use should pay attention to the following points.
1. Installation and sealing points of kettle cover
If the kettle body and kettle cover adopt a conical and circular arc surface line contact sealing form, the main bolt should be tightened to press each other tightly to achieve good sealing. However, when tightening the main bolt, the tightening torque should not exceed the range of 80-120NM to prevent the sealing surface from being squeezed and overloaded wear. Special attention should be paid to the protection of the sealing surface. When installing the kettle cover, it is necessary to slowly start it up and down to prevent the sealing surfaces between the kettle body and the kettle cover from colliding with each other and causing damage to the sealing surfaces. When tightening the main nut, it is necessary to apply force symmetrically and gradually in multiple stages, with even force to ensure a good sealing effect.
2. Key points for connecting positive and negative nuts
At the joint of the positive and negative nuts, only the positive and negative nuts can be rotated, and the two curved surfaces cannot rotate relative to each other. For all threaded connections, oil or graphite mixed with oil should be applied during assembly to avoid biting.
3. The use of valves
The needle valve adopts a wire seal. Simply rotate the valve needle gently and press the cover tightly to achieve good sealing effect. It is strictly prohibited to use excessive force to damage the sealing surface.
4. High pressure reactor controller
The controller should be placed flat on the operating platform, with a working environment temperature of 10-40 ℃ and a relative humidity of less than 85%. It is necessary to ensure that the surrounding medium does not contain conductive dust and corrosive gases.
5. Fixed contact inspection
Before use, the movable parts and fixed contacts on the front and rear panels should be checked for normal operation. The upper cover can be removed to check for loose contact of the connectors, and whether there is any damage or rust caused during transportation or improper storage.
6. Connecting wires
Connect all wires, including power lines, electric furnace lines between the controller and the kettle, motor lines, temperature sensor and speedometer wires. Before connecting the power supply, it is best to check whether the wires are intact and pay attention to electrical safety.
7. Safety device
When using a bursting disc device, it is generally not easy to disassemble and test. Once it bursts, it must be replaced again, which is very important. For bursting discs that exceed the calibrated bursting pressure but have not burst, they should be replaced immediately to ensure safe use.
8. Prevent excessive temperature difference
During the operation of high-pressure reactors, rapid cooling and heating should be avoided to prevent excessive temperature differences from causing cracks in the reactor body and affecting safety. In addition, the water jacket between the magnetic stirrer and the kettle cover should be circulated with water to prevent demagnetization of the magnetic steel and affect its use.
9. Newly installed kettle for use
Newly installed high-pressure reaction vessels (or maintenance vessels) must undergo airtightness testing before they can be put into normal use. The recommended medium for airtightness experiments is nitrogen or other inert gases, and the use of flammable and explosive gases is strictly prohibited. The test pressure is 1-1.05 times the working pressure, and the pressure must be increased in stages. It is recommended to increase the pressure gradually with a spacing of 0.25 times the working pressure. Each level should be held for 5 minutes, and stopped for 30 minutes when the test pressure is reached. When a leak is found, the pressure should be relieved before performing maintenance operations. For safety reasons, please do not operate with pressure.
