CN217367224U

CN217367224U - Crystallizer discharging device

Info

Publication number: CN217367224U
Application number: CN202221002529.3U
Authority: CN
Inventors: 李向东; 陆飞鹏; 陈方方; 姚鹏; 安瑾
Original assignee: Everbright Envirotech China Ltd; Everbright Environmental Protection Research Institute Nanjing Co Ltd; Everbright Environmental Protection Technology Research Institute Shenzhen Co Ltd
Current assignee: Everbright Envirotech China Ltd; Everbright Environmental Protection Research Institute Nanjing Co Ltd; Everbright Environmental Protection Technology Research Institute Shenzhen Co Ltd
Priority date: 2022-04-24
Filing date: 2022-04-24
Publication date: 2022-09-06
Anticipated expiration: 2032-04-24

Abstract

A discharging device of a crystallizer comprises the crystallizer, a discharging pipe and a motor, wherein a discharging hole is formed in the bottom of the crystallizer, the discharging pipe is obliquely placed at the bottom of the crystallizer, the upper surface of the middle upper part of the discharging pipe is communicated with the discharging hole of the crystallizer, a spiral auger is arranged in the discharging pipe along the center of the discharging pipe, a screen is arranged between the inner wall of the discharging pipe and the outer surface of the spiral auger, a crystal discharging hole is formed in the bottom end of the discharging pipe, a flushing hole is formed in the upper surface of the middle lower part of the discharging pipe, a liquid collecting tank is arranged at the bottom of the screen and is communicated with the lower surface of the middle lower part of the discharging pipe, and a discharging hole of the liquid collecting tank is formed in the bottom end of the liquid collecting tank; the motor is arranged at the top end of the discharge pipe, and the output end of the motor is rotationally connected with the rotating shaft of the spiral auger. This novel device promotes the material through setting up mechanical spiral on the one hand and gos forward, and on the other hand passes through screw extrusion and screen cloth screening, holds back most large granule crystal and scaling nature material, can avoid scaling nature material to get back to the crystallizer along with the circulation stream simultaneously in, improve the treatment effeciency.

Description

Crystallizer discharging device

Technical Field

The utility model belongs to the technical field of evaporation and separation device, concretely relates to crystallizer discharging device.

Background

Garbage leachate and other high-salinity and high-hardness wastewater are treated by a biochemical treatment process and a membrane system, a certain amount of membrane concentrated solution is generated, most of the membrane concentrated solution is difficult to recycle, and the membrane concentrated solution needs to be further treated by an evaporation and crystallization process, so that zero discharge of the wastewater is realized.

In the crystallizer, solute is precipitated from the solution to form crystals, the crystals are deposited at the bottom of the crystallizer, and the feed liquid has high solid content and poor fluidity and is easy to block a discharge hole, so that the discharge operation of the crystals is very difficult, and the smooth production is influenced. In addition, crystals with different sizes can be formed in the crystallization process in the crystallizer, the size of the crystals in the bottom discharge materials cannot be controlled by the traditional crystallizer, and a large amount of crystals which do not grow up are discharged, so that the treatment efficiency of the crystallizer is reduced. Meanwhile, for high-salinity and high-hardness wastewater such as landfill leachate and the like, calcium carbonate, calcium sulfate and other impurities are easily generated in the crystallization process, and if the impurities are not discharged in time, the crystallizer is easily scaled and blocked, so that the normal operation of the device is influenced.

Chinese patent application publication No. CN 107982944 a discloses an evaporative crystallization apparatus with high efficiency of heat transfer, which comprises an evaporative crystallizer, a spiral blanking machine, a crystallization filter, a steam condenser, and a vacuum pump unit. The evaporation crystallizer is provided with a steam inlet, a condensed water outlet, a material inlet, a steam outlet, a mother liquid inlet and a material outlet; the outer part of the evaporation crystallizer is provided with a semi-spiral steam sleeve, the inner part of the evaporation crystallizer is provided with a scraper type stirring paddle, the bottom of the evaporation crystallizer is a cone, and a material outlet of the evaporation crystallizer is connected with an inlet of a spiral blanking machine; the spiral blanking machine is internally provided with a spiral driving solid discharging device, and is externally provided with a cooling water sleeve for cooling materials, and the materials enter the crystallization filter through the outlet of the spiral blanking machine; filtering to obtain a crystallized solid, and returning the filtered mother liquor to the steam crystallizer; the steam outlet of the evaporative crystallizer is connected with the inlet of a steam condenser, and a vacuumizing interface arranged on the steam condenser is connected with a vacuum pump unit. The device is provided with the spiral blanking machine and the crystallization filter independently, and has the advantages of complex structure, long process flow and large occupied area. And the bottom of an evaporation crystallizer in the device is not effectively designed, so that the problem of blockage of a discharge port cannot be effectively avoided.

Chinese utility model patent document with publication number CN 203425553U discloses a crystallizer discharge gate anti-clogging device, including installing in the (mixing) shaft at the casing center of crystallizer, the center of casing diapire is equipped with the discharge gate, installs the baiting valve on the discharge gate, and the footpath of (mixing) shaft is installed and is stirred the leaf, and the bottom of (mixing) shaft has spiral scraping wings, and during the scraping wings extended to the discharge gate, the tip of scraping wings was close to the case of baiting valve. The device carries the bottom through rotatory spiral scraping wings night, has the advantage of preventing blockking up, but unable control ejection of compact crystal size and moisture content.

Disclosure of Invention

The technical problem to be solved is as follows: aiming at the problems in the prior art, the invention provides a crystallizer discharging device which can solve the problem that a bottom discharging port of a traditional crystallizer is easy to block on one hand and the problem that fine crystals are carried in the bottom discharging of the traditional crystallizer on the other hand, so that the treatment efficiency of the crystallizer is improved. Meanwhile, the problem of scaling and blocking in the crystallizer can be relieved.

The technical scheme is as follows: a discharging device of a crystallizer comprises the crystallizer, the discharging device of the crystallizer also comprises a discharging pipe and a motor, a feed opening is arranged at the bottom of the crystallizer,

the discharging pipe is obliquely placed at the bottom of the crystallizer, the upper surface of the middle upper part of the discharging pipe is communicated with a discharging port of the crystallizer, the discharging pipe comprises a spiral auger, a screen, a flushing port, a crystal discharging port, a liquid collecting tank and a liquid collecting tank discharging port, the spiral auger is arranged in the discharging pipe along the center of the discharging pipe and used for conveying materials, the screen is arranged between the inner wall of the discharging pipe and the outer surface of the spiral auger and used for filtering liquid and fine crystals, the top end of the screen is arranged at the bottom of the discharging port of the crystallizer, the bottom end of the screen is connected with the crystal discharging port, the crystal discharging port is arranged at the bottom end of the discharging pipe, the flushing port is arranged on the upper surface of the middle lower part of the discharging pipe and used for flushing residual fine crystals on the screen, the liquid collecting tank is arranged at the bottom of the screen and communicated with the lower surface of the middle lower part of the discharging pipe, and the liquid collecting tank discharging port is arranged at the bottom end of the liquid collecting tank;

the motor is arranged at the top end of the discharge pipe, and the output end of the motor is rotationally connected with the rotating shaft of the spiral auger.

Preferably, the top end of the screen is a screen ring surrounded by an oval cross section, and the length of the bottom of the screen is larger than that of the top of the screen.

Preferably, the screen is spaced apart from the inner wall of the tapping pipe.

Preferably, the mesh has a pore size of 2 to 200 μm.

Preferably, the liquid collecting groove is a conical groove with an obtuse-angle triangular section.

Preferably, the crystallizer is a high-salinity wastewater evaporative crystallizer.

Has the advantages that: this novel the device is on the one hand through setting up mechanical spiral, promotes the material and gos forward, solves the easy problem of blockking up of traditional crystallizer ubiquitous bottom discharge gate, and on the other hand passes through screw extrusion and screen cloth screening, holds back most large granule crystal and scaling nature material, solves traditional crystallizer bottom ejection of compact and smugglies the problem of tiny crystal secretly, can avoid scaling nature material to get back to in the crystallizer along with the circulation stream simultaneously to alleviate the inside problem that scales and block up of crystallizer.

Drawings

FIG. 1 is a schematic structural view of a discharge device of the novel crystallizer;

the numerical designations in the drawings represent the following: 1. a crystallizer; 2. a motor; 3. a discharge pipe; 4. a spiral auger; 5. a screen mesh; 6. flushing the port; 7. a crystal discharge port; 8. a liquid collecting tank; 9. and a discharge hole of the liquid collecting tank.

Detailed Description

The following examples and figures provide those skilled in the art with a more complete understanding of the present invention, but are not intended to limit the invention in any way.

Example 1

A crystallizer discharging device, see figure 1, comprises a crystallizer 1, a discharging pipe 3 and a motor 2, wherein a feed opening is arranged at the bottom of the crystallizer 1. The discharge pipe 3 is obliquely arranged at the bottom of the crystallizer 1, and the upper surface of the middle upper part of the discharge pipe 3 is communicated with a feed opening of the crystallizer 1. The discharging pipe 3 comprises a spiral auger 4, a screen 5, a flushing port 6, a crystal discharging port 7, a liquid collecting tank 8 and a liquid collecting tank discharging port 9, wherein the spiral auger 4 is arranged inside the discharging pipe 3 along the center of the discharging pipe 3 and used for conveying materials. The screen cloth 5 is located between 3 inner walls of discharging pipe and the 4 surfaces of spiral auger for filter liquid and tiny crystal to 1 feed opening bottom of crystallizer is located on the 5 tops of screen cloth, and the bottom is connected with

crystal discharge gate

7, 3 bottoms of discharging pipe are located to crystal discharge gate 7. The flushing port 6 is arranged on the upper surface of the middle lower part of the discharge pipe 3 and used for flushing residual fine crystals on the screen mesh to prevent the screen mesh from being blocked. The bottom of the screen mesh 5 is arranged in the liquid collecting tank 8, the lower surface of the middle lower part of the discharging pipe 3 is communicated with the liquid collecting tank, and the bottom end of the liquid collecting tank 8 is arranged at a discharging hole 9 of the liquid collecting tank. Motor 2 locates 3 tops of discharging pipe, and motor 2's output is connected with the rotation axis rotation of spiral auger 4 for it is rotatory to drive spiral auger 4. The distance between the 4 blades of the spiral auger is 100-fold 200mm, and the diameter of the outer circle is 300-fold 400 mm.

The device has the following use process: the concentrated feed liquid enters the discharge pipe 3 from the bottom of the crystallizer 1, the spiral auger 4 is mechanically pushed and extrudes the feed liquid to advance, the deposition and blockage of viscous slurry in the discharge pipe 3 can be effectively prevented, and the rotating speed of the spiral auger 4 is 60 r/min. The feed liquid is subjected to solid-liquid separation under the combined action of the screen 5 and the spiral auger 4, most of large-particle crystals and scaling substances carried in the feed liquid are extruded and dehydrated and then discharged through a crystal discharge port 7, and the water content of the discharged material is less than 65%. Liquid separated by the screen 5 and fine crystals carried in the liquid enter a liquid collecting tank 8 at the lower part of the screen 5, are discharged through a liquid collecting tank discharge port 9, and then enter the crystallizer again for continuous treatment. The upper surface of the middle lower part of the discharge pipe is provided with a flushing port for flushing residual fine particles on the screen, and the cleaning frequency is 1.5 min/6 h.

Example 2

The difference from the embodiment 1 is that the top end of the screen 5 is a screen circle surrounded by an oval section, and the length of the bottom of the screen 5 is larger than that of the top. And a gap is reserved between the screen 5 and the inner wall of the discharge pipe 3. The aperture of the screen 5 is 100 μm. The liquid collecting groove 8 is a conical groove with an obtuse triangle section. The crystallizer 1 is a high-salinity wastewater evaporative crystallizer.

This novel the device is on the one hand through setting up mechanical spiral, promotes the material and gos forward, solves the easy problem of blockking up of traditional crystallizer ubiquitous bottom discharge gate, and on the other hand passes through screw extrusion and screen cloth screening, holds back most large granule crystal and scaling nature material, solves traditional crystallizer bottom ejection of compact and smugglies the problem of tiny crystal secretly, can avoid scaling nature material to get back to in the crystallizer along with the circulation stream simultaneously to alleviate the inside problem that scales and block up of crystallizer.

Claims

1. A crystallizer discharging device comprises a crystallizer (1) and is characterized by further comprising a discharging pipe (3) and a motor (2), wherein a feed opening is formed in the bottom of the crystallizer (1),

discharging pipe (3) slope is placed in crystallizer (1) bottom to discharging pipe (3) well upper surface and crystallizer (1) feed opening intercommunication of upper portion, discharging pipe (3) include spiral auger (4), screen cloth (5), wash mouthful (6), crystal discharge gate (7), collecting tank (8) and collecting tank discharge gate (9), spiral auger (4) are located inside discharging pipe (3) along discharging pipe (3) center, screen cloth (5) are located between discharging pipe (3) inner wall and spiral auger (4) surface to screen cloth (5) top is located crystallizer (1) feed opening bottom, and the bottom is connected with crystal discharge gate (7), discharging pipe (3) bottom is located in crystal discharge gate (7), wash the upper surface of mouthful (6) lower part in discharging pipe (3), screen cloth (5) bottom is located in collecting tank (8), the lower surface of the middle lower part of the discharge pipe (3) is communicated with the discharge hole (9) of the liquid collecting tank, and the discharge hole of the liquid collecting tank is arranged at the bottom end of the liquid collecting tank (8);

the motor (2) is arranged at the top end of the discharge pipe (3), and the output end of the motor (2) is rotatably connected with the rotating shaft of the spiral auger (4).

2. Crystallizer tapping device as in claim 1, characterized in that the top of the screen (5) is a screen ring with an oval cross-section, the length of the bottom of the screen (5) being greater than that of the top.

3. Crystallizer tapping device according to claim 1, characterized in that the screen (5) is spaced apart from the inner wall of the tapping pipe (3).

4. Crystallizer tapping device as in claim 1, characterized in that the screen (5) has a pore size of 2-200 μm.

5. Crystallizer discharge device according to claim 1, characterized in that said collector channel (8) is a conical channel with an obtuse triangle section.

6. Crystallizer discharge device according to claim 1, characterized in that the crystallizer (1) is a high-salt waste water evaporative crystallizer.