CN-224220780-U - Continuous evaporation crystallization kettle

CN224220780UCN 224220780 UCN224220780 UCN 224220780UCN-224220780-U

Abstract

The utility model provides a continuous evaporation crystallization kettle, which relates to the technical field of evaporation crystallization and comprises a shell, wherein the lower end of the shell is provided with a feed inlet, the upper end of the shell is provided with a gas phase discharge port, the side wall of the shell is provided with a mother liquor overflow port, an elutriation leg is connected below the shell, the inner space of the elutriation leg is communicated with the inner space of the shell, the lower end of the elutriation leg is provided with a bottom plate with the middle part protruding upwards and the periphery recessed downwards, the bottom plate is provided with a crystal slurry discharge port at the position recessed downwards, and the stirring device comprises a push-type stirring mechanism arranged in the shell, wherein the crystal slurry discharge port is positioned in the action range of the push-type stirring mechanism, and the problems that the evaporation crystallization kettle is easy to scale and difficult to clean and is easy to block the crystal slurry discharge port in the prior art are solved.

Inventors

LIU TONG
GUO CE
GU CHAOQUN
XIE YUNZHU
QI QI
CAO HUI
SUN HE
YANG SHAOWEI
YANG HUI
ZHANG YING

Assignees

鲁信天地人环境科技(安徽)集团有限公司

Dates

Publication Date: 20260512
Application Date: 20250530

Claims (10)

1. A continuous evaporative crystallization kettle, comprising: The device comprises a shell, wherein the lower end of the shell is provided with a feed inlet, the upper end of the shell is provided with a gas-phase discharge outlet, and the side wall of the shell is provided with a mother liquor overflow port; The washing leg is connected below the shell, the inner space of the washing leg is communicated with the inner space of the shell, the lower end of the washing leg is provided with a bottom plate with the middle part protruding upwards and the periphery recessed downwards, and the bottom plate is provided with a crystal slurry discharge hole at the position recessed downwards; The stirring device comprises a push type stirring mechanism arranged in the shell, and the crystal slurry discharge port is positioned in the action range of the push type stirring mechanism.
2. The continuous evaporative crystallization kettle according to claim 1, wherein a jacket is provided on the outer side of the housing, and a steam inlet and a condensed water outlet are provided on the upper and lower portions of the jacket, respectively.
3. The continuous evaporative crystallization kettle according to claim 1, wherein the push-on stirring mechanism comprises: The first driving motor is arranged above the shell; the stirring shaft penetrates through the top of the shell and is connected with the output end of the first driving motor; and the propelling stirring paddle is connected with the stirring shaft.
4. A continuous evaporative crystallization kettle according to claim 3, wherein the stirring device further comprises a frame type stirring mechanism, and the periphery of the frame type stirring mechanism is provided with a scraping plate matched with the inner wall of the shell.
5. The continuous evaporative crystallization kettle according to claim 4, wherein the frame stirring mechanism comprises: the second driving motor is arranged above the shell, and a first bevel gear is arranged at the output end of the second driving motor; the stirring barrel penetrates through the top of the shell and is rotatably sleeved on the outer side of the stirring shaft, and a second bevel gear matched with the first bevel gear is arranged at the upper end of the stirring barrel; And the frame type stirring paddle is connected with the stirring cylinder.
6. The continuous evaporative crystallization kettle according to claim 5, wherein the inner wall of the housing is provided with an annular baffle plate disposed above the frame type stirring paddle.
7. The continuous evaporative crystallization kettle according to claim 5, wherein the scraping plate is disposed radially outwardly of the frame-type stirring paddle.
8. The continuous evaporative crystallization kettle of claim 1, wherein the inner diameter of the elutriation legs is 20-50% of the inner diameter of the shell, the aspect ratio of the shell is 1:1 to 2:1, and the aspect ratio of the elutriation legs is 0.5:1 to 3:1.
9. The continuous evaporative crystallization kettle of claim 6, wherein the baffle has an area of 40% to 80% of the cross-sectional area of the housing.
10. The continuous evaporative crystallization kettle according to claim 6, wherein the mother liquor overflow is disposed above the baffle.

Description

Continuous evaporation crystallization kettle Technical Field The utility model belongs to the technical field of evaporative crystallization, and particularly relates to a continuous evaporative crystallization kettle. Background Evaporative crystallization is also receiving increasing attention as the last process of wastewater zero release treatment. At present, industrial evaporation crystallization generally adopts two modes of multi-effect evaporation (MED) or vapor mechanical recompression evaporation (MVR), and the biggest problem existing in the two modes is that inorganic salts such as sodium sulfate and sodium chloride separated out in the evaporation crystallization process scale on the surface of a heat exchange tube of a reboiler, so that the heat exchange efficiency is reduced, the operation is difficult for a long time, frequent shutdown cleaning is needed, and the continuity is poor. In addition, the slurry discharge port at the bottom of the crystallizer is easy to be blocked by precipitated crystals, so that the situation of difficult discharge occurs. Patent publication No. CN211611691U proposes to clean the evaporating kettle inner wall at evaporating kettle (mixing) shaft surface mounting brush, but the brush cleans the scope limited, only can clean on stirring rake upper portion, and the brush needs to rotate with the stirring rake with the rotational speed, and the rotational speed is too fast can lead to the brush life-span to shorten, damages easily. The patent document of the patent publication No. CN218501275U proposes that the wall of the evaporation kettle is cleaned by utilizing a double motor and a telescopic scraping plate, so that the inner wall of the evaporation kettle can be cleaned, but the problem of blockage of a discharging hole is still difficult to solve, the position of the discharging hole at the bottom is a vacuum area of a stirring shaft, a large amount of crystals are easily accumulated to cause blockage of a crystal slurry discharging hole and a pipeline, in addition, the scheme does not thicken crystal slurry, and the content of mother liquor in the discharged crystal slurry is too high, so that the pressure of subsequent solid-liquid separation equipment is increased. Disclosure of utility model The utility model aims to overcome the defects in the prior art, provides a continuous evaporation crystallization kettle, and solves the problems that the evaporation crystallization kettle in the prior art is easy to scale and difficult to clean and is easy to block a crystal slurry discharge hole. In order to achieve the above object, the present utility model provides a continuous evaporation crystallization kettle comprising: The device comprises a shell, wherein the lower end of the shell is provided with a feed inlet, the upper end of the shell is provided with a gas-phase discharge outlet, and the side wall of the shell is provided with a mother liquor overflow port; The washing leg is connected below the shell, the inner space of the washing leg is communicated with the inner space of the shell, the lower end of the washing leg is provided with a bottom plate with the middle part protruding upwards and the periphery recessed downwards, and the bottom plate is provided with a crystal slurry discharge hole at the position recessed downwards; The stirring device comprises a push type stirring mechanism arranged in the shell, and the crystal slurry discharge port is positioned in the action range of the push type stirring mechanism. Optionally, a jacket is arranged on the outer side of the shell, and a steam inlet and a condensate outlet are respectively arranged on the upper part and the lower part of the jacket. Optionally, the push-type stirring mechanism comprises: The first driving motor is arranged above the shell; the stirring shaft penetrates through the top of the shell and is connected with the output end of the first driving motor; and the propelling stirring paddle is connected with the stirring shaft. Optionally, the stirring device further comprises a frame stirring mechanism, and a scraper matched with the inner wall of the shell is arranged on the periphery of the frame stirring mechanism. Optionally, the frame stirring mechanism includes: the second driving motor is arranged above the shell, and a first bevel gear is arranged at the output end of the second driving motor; the stirring barrel penetrates through the top of the shell and is rotatably sleeved on the outer side of the stirring shaft, and a second bevel gear matched with the first bevel gear is arranged at the upper end of the stirring barrel; And the frame type stirring paddle is connected with the stirring cylinder. Optionally, an annular baffle is disposed on the inner wall of the housing, and the baffle is disposed above the frame-type stirring paddle. Optionally, the scraper is disposed radially outward of the frame-type stirring paddle. Optionally, the inner diameter of the elu