Advantages of magnetic high pressure reactor over packing sealed reactor

Magnetic seal technology has many advantages over packing seal and mechanical seal oil, such as simple operation, simple maintenance, no leakage, cost reduction, energy saving and consumption reduction, so the application scope of magnetic high-pressure reactor will be more and more wide in the future.

The magnetic kettle is sealed to change the dynamic seal into static seal, which requires a fully enclosed sealing structure. The magnetic force is made of rare earth structural steel, which has good stability, is not easy to demagnetize, and has a long service life. However, it should be noted that during operation, the internal magnetic rotor in the isolation sleeve constantly stirs the medium, coupled with eddy current and other factors, resulting in the temperature rise of the isolation sleeve. Generally, when the temperature exceeds 200 ℃, it will cause serious demagnetization of magnetic materials and failure. In the magnetic high-pressure reactor, the magnetic drive device is the key component to realize the mixing of materials, and it is also the necessary component to deal with the high-pressure environment, so it is indispensable. Generally, the magnetic drive device is used to seal the mixing parts, which can effectively solve the reliability of the dynamic seal between the mixing shaft and the reactor under high pressure.

Magnetic drive devices are generally made of ferromagnetic materials, and the permeability of the device is very obvious. When the magnetic field passes through the sealing alloy layer, it will hardly suffer any loss, so the rotating magnetic field generated by the external permanent magnet can be effectively accepted by the internal permanent magnet rotor, thus driving the mixing parts in the reactor to mix the materials.

The original packing sealed reactor is used to release hydrogen after the reaction, which is delivered to the reactor by high-temperature multistage pump. The process flow has the following problems:

1. The packing sealed reaction kettle has poor sealing effect and is easy to leak, which not only causes the leakage of aniline and other steam, wastes raw materials, but also the leakage of flammable and explosive gases

2. Since the temperature after the preparation reaction is still greater than 260 ℃, and the allowable temperature range of the high-temperature multistage pump is required to be less than 180 ℃, it is necessary to lower the temperature to 180 ℃ before starting the pump. In this way, not only the heat transfer oil is cooled by cooling water, and then the material temperature is cooled, which increases the heat consumption, but also the production time of each kettle is increased by about 2 hours.

3. After being transported to the reaction kettle, since the medium temperature has dropped from 260 ℃ to 180 ℃, in the reaction kettle, the heat transfer oil must be heated to more than 260 ℃ to react, and each kettle needs an additional heat supply of 100000 kcal.

4. As the raw material was discharged from the preparation kettle in the original process, part of the unreacted aluminum powder was entrained to the pump, making the pump unable to work, so the feed filter was added before feeding the pump, and the filter needs to be cleaned once a month on average.

5. During the conveying process of high-temperature multi-stage pump after cooling, due to the presence of a large amount of aluminum powder in the material, the bottom valve was often easily blocked, and the valve was often backwashed and removed, which not only affected the production but also easily damaged the impeller and mechanical seal of the multi-stage pump. Because the materials are transported intermittently, it is easy to cause mechanical seal leakage, affect production and cause environmental pollution. The workload of maintenance workers is quite large, and the maintenance work is carried out once a week on average. In particular, the maintenance workers of the middle shift and zero shift often work overtime to maintain production. The maintenance work environment is bad, the smell is pungent, causing dizziness and headache, and the cost of maintenance spare parts is high.

Due to the above defects, the magnetic high-pressure reactor is now prepared by magnetic sealing, pressurized and transported to the reactor. This process has the following advantages:

1. during the preparation of high-pressure reactor, the magnetic seal has no leakage, which ensures the normal production and reduces the leakage waste of materials.

2. because there is no leakage, the reaction can be controlled under the reaction pressure of 3~3.5Mpa, which improves the preparation effect and shortens the preparation reaction time.

3. due to the use of differential pressure transmission, the high-temperature multi-stage pump is canceled, which saves electricity, especially the maintenance workers, reduces the hard maintenance work, and saves the cost of expensive spare parts.

4. since there is no need to pump or lower the temperature, it is directly transported to the reactor at 260 ℃, saving 100000 kcal of heating per reactor, saving 2 hours of production time and improving the production capacity.

The key component of the magnetic high-pressure reactor, the magnetic coupling driver, is a transmission device that uses permanent magnetic materials for coupling transmission. It changes the dynamic sealing structure of the traditional mechanical seal and packing seal, which seals the mixing shaft through the shaft sleeve or packing, into a static sealing structure. The medium in the reactor is located in the sealing cavity composed of the reactor body and the sealing cover body, which solves the insurmountable leakage problem caused by the dynamic sealing of the packing seal and mechanical seal, and the reaction medium is free from any leakage and pollution.

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