How to solve the problem of eccentricity of the stirring shaft of the stainless steel reactor

1Stainless steel stirred reactor is an indispensable bearing pressure vessel in the production process of the chemical and petrochemical fields. The stainless steel stirred reactor is composed of the body of the stainless steel reactor, stirring transmission device, agitator, etc. The power is transmitted by the stirring transmission device to the stirring shaft, and the stirring shaft drives the agitator to reach the mixing medium material to complete various chemical process requirements. The shaft is a cantilever beam structure, which is convenient for installation, maintenance, and reduces the influence of medium corrosion. A large stirred reactor produced by a certain company. Because the cantilever of the stirring shaft is too long, the diameter of the stirrer is large. The required power is large, the torsion force of the stirring bearing is large, and the centrifugal force of the stirring also increases immediately, and the stirring shaft is twisted, and the shaking of the stirring shaft exceeds the allowable range of the shaft seal, causing the shaft seal of the stirring reactor to be damaged. Cause parking for maintenance. During the drawing design of the equipment, a three-legged bottom support is set between the lower end of the stirring shaft and the bottom of the reactor to improve the support conditions of the stirring shaft of the reactor. Reduce the deflection of the stirring shaft and ensure that the radial deflection of the shaft runs within the allowable range. However, in actual use, the effect is not ideal.
2 solution
The bottom support can be divided into three-legged type, bottom flange type, labyrinth type, and detachable type according to different methods. The sliding operation mode between the rotating sleeve and the fixed sleeve is mainly adopted. The addition of the bottom support changes the supporting conditions of the stirring shaft. At the same time, the fulcrum of the stirring shaft is increased. This puts high demands on the installation of the bottom bearing. Poor installation will increase the eccentricity, aggravate the wear of the upper and lower bearings and generate vibrations. In addition, when the bottom bearing is lubricated by liquid medium in the reaction medium. However, when there are small solid particles, they will enter the bottom bearing and cause the bearing to wear and block the seizure. Aiming at the shortcomings of the prior art, a simple structure, reliable operation, corrosion resistance, high temperature resistance, wear resistance, Easy to install, suitable for the bottom support in the stirred reactor and implement modification construction. The bottom support structure consists of an inner ceramic shaft and an outer ceramic ring to form the moving parts of the support body; the support body frame, the contact shaft body, and the sealing gland jointly fix the ceramic components. Play the role of sealing, fixing and supporting, but also overcome the shortcomings of fragile ceramic components. The height of the outer ceramic ring is adjusted by the adjusting pad, and the contact area between the inner ceramic shaft and the outer ceramic ring 6 is increased. The above components constitute a fulcrum of the planetary structure supported by the bottom. According to the size of the stirring reactor, the rotation speed and diameter of the stirring shaft, the number of fulcrums of the planetary structure is selected to form triangles, squares, pentagons, six points, etc. The stirring shaft is installed in this support, and the bottom support is fixed on the reactor body through the bottom support bottom plate 3 to prevent the shaking of the stirring shaft to prevent the radial swing of the stirring shaft from exceeding the allowable amount of the stirring shaft seal. Radial deviation plays the role of bottom anti-sway to ensure the safe operation of the stirred reactor using this device. It has a bottom support device that does not require lubrication. The wear resistance of ceramics is used to increase the service life of the bottom support. At the same time, the planetary structure is more suitable for When the reaction medium contains solid materials.
3 Conclusion
The equipment with the modified bottom support was put into production again. After 6 months of operation, the equipment runs smoothly and reliably, which proves that it is a planetary ceramic bottom support in a stirred reactor with simple structure, reliable work, corrosion resistance, high temperature resistance, abrasion resistance, and easy installation. The inner ceramic shaft and the outer ceramic ring constitute a fulcrum of the planetary structure supported by the bottom. By adjusting the position of the fulcrum formed by the inner ceramic shaft and the outer ceramic ring, the stirring shaft of the stirring reactor can be operated concentrically with it, avoiding the eccentric movement of the stirring shaft, and better solving the problem of the cantilever shaft bottom support of the large reactor.

Shandong Bojing Chemical Machinery Co., Ltd. was established in 2007. It is a professional manufacturer in the field of fine chemical equipment. The company's products are mainly stainless steel, titanium, nickel, Monel and other non-ferrous materials. It is an integrated design, research and development, and manufacturing. Sexual high-tech enterprises. The core products are widely used in the treatment of waste water and waste gas in biochemical and fine chemical plants, as well as for energy conservation and efficiency enhancement. The company has pressure vessel (level D) manufacturing qualification and ASME certification issued by the General Administration of Quality Supervision, Inspection and Quarantine.