A glass-lined still

Abstract

The invention discloses a glass-lined distillation kettle, which comprises a casing, a steam inlet and a feed inlet. There are several guide elements for adjusting the air flow. The lower part of the feed port close to the shell is concave to form a divergent part. The divergent part is used to diverge and atomize the material entering the kettle. By improving the feed inlet and steam inlet, the impact strength of the material on the enamel layer and the thermal impact of steam on the stainless steel lining are respectively reduced, so that the enamel layer is not easy to be damaged by the impact and heated evenly, and the generation of the enamel layer is greatly reduced. The internal stress, the occurrence rate of ceramic explosion is effectively controlled, reducing maintenance and operating costs. At the same time, by coating a layer of heat-conducting paint on the surface of the stainless steel lining, it not only enhances the mechanical properties and anti-corrosion properties of the stainless steel lining, It also further ensures the uniform heating of the enamel layer, so that the rate of porcelain explosion is reduced to a minimum.

Description

technical field [0001] The invention relates to the field of chemical machinery equipment, in particular to a glass-lined still. Background technique [0002] Glass-lined still, as a kind of still used in chemical production, is mainly designed to solve the problem of intermittent maintenance and cleaning when the material contains solids and high boiling points in the production process. It generally includes the still shell, above the still shell is the upper head, there is a gas outlet on the upper head, there is a demister under the upper head, the storage room is below the demister, and the upper part of the storage room is Feed inlet, indoor evaporator, the lower part of the still is a settling chamber for solids and high boiling point substances, a stirrer is installed in the settling chamber, the stirrer shaft is connected with an external motor through a shaft seal, and the bottom of the still is equipped with a solid and high boiling point settling chamber. The hi...

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Problems solved by technology

[0004] Through the analysis of the damaged part of the tank body, it is found that in the existing glass-lined stills, the impact force of the material and the impact force of the steam are often not paid attention to, that is, the existing feeding method is to directly transfer the material from the feeding port to the distillation In the still, even if the inside of the still is smooth and flat, and the bottom of the still has a circular arc transition, due to the large impact force of the material, it will still cause a large impact load on the bottom of the still. Although this impact load is within the range of the enamel layer, but After several impacts, the fatigue strength of the enamel layer decreases, resulting in a decrease in strength and a tendency to crack. When the strength drops to a certain critical value, dark cracks appear in the enamel layer. After continued stress, the dark cracks in the enamel layer evolve. In order to reveal cracks, and then lead to the phenomenon of ceramic explosion; when high-temperature steam is introduced into the interlayer of the distillation kettle through the steam inlet, the high-temperature steam often directly causes local thermal shock to the stainless steel lining, and due to the sudden rise in temperature, the stainless steel lining is often still There is no time for uniform heat dissipation to generate local high temperature. The generation of local high temperature causes the thermal expansion coefficient of the stainless steel lining itself to be different, resulting in greater thermal stress, which further promotes greater stress on the enamel layer. This stress increases with the After several times of steaming, it is continuously enlarged. When the allowable stress is exceeded, the enamel layer will be destroyed

In view of this, in some glass-lined stills, steam baffles are installed at the steam inlet to reduce the impact of the steam. Although this method plays a certain role, it is not conducive to the rapid filling of the interlayer with steam In order to eliminate uneven heating, it also requires higher material and installation requirements for the steam baffle. It has a single function and is inconvenient to use. It still cannot effectively solve practical problems and has poor adaptability.

[0005] In addition, the existing glass-lined stills only pay attention to the anti-corrosion of the glass-lined layer inside the still, and do not consider the anti-corrosion of the stainless steel inner lining. Under high-temperature steam, hydrogen corrosion often occurs on the surface of stainless steel to form white spots. It provides a source of cracks for cracks, and the generation of cracks is the root cause of the rupture of the stainless steel lining. Although the probability of stainless steel lining rupture is very small, once it occurs, it will cause great harm

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