CN211424426U

CN211424426U - Novel slag cooler

Info

Publication number: CN211424426U
Application number: CN201921091759.XU
Authority: CN
Inventors: 张蕴; 苏培善; 刘玉; 张之浩
Original assignee: Jinan Lanyun Chemical Technology Co ltd
Current assignee: Jinan Lanyun Chemical Technology Co ltd
Priority date: 2019-07-12
Filing date: 2019-07-12
Publication date: 2020-09-04
Anticipated expiration: 2029-07-12

Abstract

The novel slag cooler comprises a stirring cage shell and is characterized in that a transmission mechanism controls a spiral sheet to move in the stirring cage shell, the stirring cage shell is provided with a material inlet and a material outlet, and the spiral sheet conveys a material at the material inlet to the material outlet; a cooling jacket is arranged outside the stirring cage shell, and a cooling water inlet and a cooling water outlet are respectively arranged at the two ends of the cooling jacket. The cooling jacket is a cavity sleeved outside the stirring cage shell, a cooling water inlet of the cooling jacket is arranged below one end of the discharging part, and a cooling water outlet is arranged above the other end of the cooling jacket, which is used for feeding. The cooling water inlet is arranged eccentrically, and the cooling water inlet is inclined towards the material outlet. And a spiral baffle plate which enables cooling water to flow to the outlet in a rotating manner is arranged between the cooling water inlet and the cooling water outlet. The spiral piece comprises a forward spiral piece and a reverse spiral piece which are respectively arranged at two sides of the material outlet.

Description

Novel slag cooler

Technical Field

The patent relates to a conveying equipment, a solid slag charge conveying equipment who has the function of heat transfer in the chemical production device especially relates to a novel simple stirring cage formula presss from both sides cold sediment conveyer of cover.

Background

At present, fluorite and sulfuric acid are used as raw materials in most anhydrous hydrogen fluoride production devices, nearly one hundred sets of the production devices are shared in China, and the total production capacity of the production devices is about 150 million tons/year. In the anhydrous hydrogen fluoride production apparatus, the reaction system is a reaction converter with jacket heating, a cold slag conveyor (converter type) is used at the slag discharge position behind the converter for cooling the temperature of the resultant fluorgypsum after the reaction, and slaked lime is added into the converter for neutralizing the residual sulfuric acid in the fluorgypsum.

The slag cooler is divided into a plurality of types according to the slag charge to be cooled and the structural style: such as a roller slag cooler, a vibration slag cooler, a water-cooled slag cooler, a disc slag cooler and the like. The structure of the common slag cooler mainly comprises an outer cylinder welded with a transmission device outside the cylinder and an inner cylinder welded with fixed spiral guide blades, wherein the inner cylinder is of various types including a multi-pipe type and a sleeve type, the inner wall of the inner cylinder is provided with the fixed spiral guide blades, and slag lifting plates are welded between the fixed spiral guide blades; when the slag cooler is driven by a transmission device to rotate slowly, the high-temperature slag is guided to advance in the inner cylinder of the converter by the spiral blades, and meanwhile, when the slag cooler rotates, the slag lifting plate drives the slag to lift upwards and scatter downwards after reaching a certain height, the high-temperature slag in the inner cylinder is continuously stirred, heat exchange is carried between the high-temperature slag and the furnace wall with cooling water, the heat of the slag is taken away, and the hot-state slag is cooled gradually.

The high-temperature heat exchanger needs to have enough heat exchange area to cool a large amount of slag to a certain temperature within a certain time. The heat exchange area is positively correlated with the heat exchange quantity. The larger the slag passing sectional area is, the more slag can be discharged per hour. The slag passing sectional area is positively correlated with the slag passing capability. Under the condition that the diameter and the length of the cylinder are fixed, the slag passing sectional area can be enlarged as much as possible, which is favorable for improving the slag discharging capability and the heat exchange area. Enough residence time is required, the residence time of the slag is enough long, and the rotating speed is enough low; at the same time, the low rotation speed is beneficial to controlling the heat exchange surface and mechanical abrasion. The high rotational speed results in a short slag residence time, which is disadvantageous for cooling.

The slag cooler in the anhydrous hydrogen fluoride device is a converter type slag cooler, a transmission gear ring mechanism is welded at the rear end part of the outer wall of the converter, a speed reducer is driven by a main motor to rotate a small gear ring, and a converter barrel is driven to rotate through the meshing of the small gear ring and a large gear ring on the outer wall of the converter. The shell of the converter directly sprays circulating water, the lower part of the shell is provided with a water collector, and the low-temperature circulating water exchanges heat with the internal hot slag through the wall of the converter. The high-temperature hot slag entering the furnace is cooled to 40-90 ℃ from 240-290 ℃, and the cold slag is finally discharged out of the converter type cold slag conveyor.

The converter type slag cooler used by the existing anhydrous hydrogen fluoride device mainly has the following problems: 1. the heat exchange cooling efficiency is low, the scaling corrosion of the shell of the converter slag cooler is serious, and after the converter slag cooler is used for a period of time, the heat of high-temperature hot slag cannot be transferred out, so that the slag cannot be cooled and the required low temperature cannot be reached. 2. The transmission structure is complicated, the size of the equipment is huge, the equipment is easy to break and is not easy to maintain, and the maintenance cost is high. 3. The equipment has high manufacturing cost, long installation period, high installation requirement and high price. 4. The production and use period is short, and the long-period cooling use cannot be realized.

Disclosure of Invention

The invention aims to provide a spiral conveyor with a cooling jacket, which can fully recover hot water, prevent the shell of a slag cooler from scaling and corroding seriously and improve the cooling efficiency, and in order to realize the aim, the technical scheme of the invention is as follows:

the cage-stirring slag cooler is a conveying stirring cage with heat exchange and cooling functions. The spiral plate is welded on the central shaft inside, and the conveying stirring cage with jacket is welded outside. The novel slag cooler comprises a stirring cage shell and is characterized in that a transmission mechanism controls a spiral sheet to move in the stirring cage shell, the stirring cage shell is provided with a material inlet and a material outlet, and the spiral sheet conveys a material at the material inlet to the material outlet; a cooling jacket is arranged outside the stirring cage shell, and a cooling water inlet and a cooling water outlet are respectively arranged at the two ends of the cooling jacket.

The cooling jacket is a cavity sleeved outside the stirring cage shell, a cooling water inlet of the cooling jacket is arranged below one end of the discharging part, and a cooling water outlet is arranged above the other end of the cooling jacket, which is used for feeding.

The cooling water inlet is arranged eccentrically, and the cooling water inlet is inclined towards the material outlet. And a spiral baffle plate which enables cooling water to flow to the outlet in a rotating manner is arranged between the cooling water inlet and the cooling water outlet.

The spiral piece comprises a forward spiral piece and a reverse spiral piece which are respectively arranged at two sides of the material outlet.

The forward spiral piece and the reverse spiral piece respectively convey materials to the material outlet. The stirring cage shell is also provided with a feeding port. The transmission mechanism comprises a speed reducing motor, one side of the speed reducing motor is connected with a coupler, the coupler is connected with the spiral sheet, a speed reducing base is further arranged below the speed reducing motor, and a middle base is arranged at a position, close to the discharge port, of the stirring cage shell.

The middle of the spiral sheet is provided with a transmission shaft, and the coupler is fixedly connected with the transmission shaft. The two ends of the stirring cage shell are respectively provided with a head bearing and a tail bearing,

the original slag cooler is improved, the original slag cooler is of a converter type, a large pushing material stirring cage is arranged in the converter, the shell of the converter is directly sprayed with circulating water for cooling, the lower part of the converter is provided with a water collector, the converter is improved into a stirring cage (a spiral conveyor) with a cooling jacket, and desalted water is used as cooling water; and the spiral baffle is used for preventing cooling water flow from directly flowing to the outlet, so that the temperature difference gradient of heat exchange is increased. The heat can be fully recovered to be made into hot water for recycling; the cooling problems of the original equipment, such as serious scaling and corrosion of the shell of the slag cooler, short service cycle and incapability of transferring heat of hot slag in the furnace are avoided. The residual acid is adhered to the fluorgypsum just after the fluorgypsum is discharged from the rotary furnace, and slaked lime is added for neutralization treatment and then the fluorgypsum is placed and stabilized.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a top view of a cooling jacket according to the present invention;

FIG. 3 is a left side view of a cooling jacket of the present invention;

FIG. 4 is a front view of a cooling jacket of the present invention;

FIG. 5 is a schematic view of the spiral baffle structure of the present invention.

In the attached drawings, 1, a speed reducing motor; 2. a coupling; 3. a head bearing; 4. a mixing cage housing; 5. a forward flight; 6. a tail bearing; 7. a speed reducer base; 8. a middle machine base; 9. a cooling jacket; 10. a reverse flight; 11. a material inlet; 12. a sampling port; 13. a feed inlet; 14. a cooling water outlet; 15. a viewing port; 16. a material outlet; 17. a cooling water inlet; 18. a spiral baffle.

Detailed Description

To better illustrate the manner of use of the device, the invention is further described with reference to the accompanying figures 1-5 of the specification,

when the device is used for the production of anhydrous hydrogen fluoride, fluorgypsum which is reacted in a reaction furnace is discharged and enters a material inlet 11 of a stirring cage, wherein a speed reduction motor 1 works to drive a coupler 2 to rotate, the coupler 2 drives a spiral in the stirring cage to rotate, a spiral piece on the spiral rotates to push the fluorgypsum to a material outlet 16, a head bearing 3 and a tail bearing 6 are arranged at two ends of a shell 4 of the stirring cage, two ends of a transmission rod of the spiral piece are arranged in the bearings to reduce friction force and prolong service life, the rotary conveying has the advantages that the heat of the fluorgypsum in the shell 4 of the stirring cage is uniformly dissipated, a section of spiral piece is arranged on the right side of the material outlet 16, and the spiral piece is a reverse spiral piece 10 and prevents the fluorgypsum from being accumulated at the tail end of the stirring cage and blocking the tail to stir the cage to be clamped. The stirring cage shell 4 is provided with a feed inlet 13, slaked lime is put into the feed inlet 13 to carry out neutralization reaction treatment on unreacted acid in the fluorgypsum, and the unreacted acid is discharged together.

The fluorgypsum at the tail part is conveyed to a material outlet 16, a cooling jacket 9 is arranged outside the stirring cage shell 4, the cooling jacket 9 is arranged around the stirring cage shell 4, a cooling water inlet 17 of the cooling jacket 9 is arranged below, and a cooling water outlet 14 is arranged above, wherein the cooling water inlet 17 is arranged off the central line and is inclined towards the material outlet 16, so that when cooling water enters the cooling jacket 9, water flow rotates and rotates around the outer wall of the stirring cage shell 4 along the direction of a spiral baffle plate, a spiral shaft in the stirring cage is a processed thick-wall pipe, and two ends of the processed thick-wall pipe are solid short shafts and are welded at two ends of the thick-wall pipe; the spiral plate is welded on the spiral shaft, the flow velocity of the water flow rotating spirally is faster, so that the water flow is more fully contacted with the stirring cage shell 4, and the heat transfer resistance between the cooling water and the fluorgypsum in the stirring cage shell 4 is reduced. The cooling jacket 9 can convert cooling water into hot water, fully recover heat in the high-temperature fluorgypsum, and make the hot water for reuse. Compared with the prior art, as the cooling water is cooled by desalted water, the problem that the heat in the hot slag can not be recovered is solved.

The cooling water inlet 17 that inclines can make the cooling water in the cooling jacket 9 rotate, and another embodiment of this device is to set up spiral baffle 18 in the cooling jacket 9, and rotation type baffle 18 prevents that rivers from directly flowing to the export, increases the temperature gradient of heat transfer, increases heat exchange efficiency.

Claims

1. The novel slag cooler comprises a stirring cage shell (4) and is characterized in that a transmission mechanism controls a spiral sheet to move in the stirring cage shell (4), the stirring cage shell (4) is provided with a material inlet (11) and a material outlet (16), and the spiral sheet conveys a material at the material inlet (11) to the material outlet (16); a cooling jacket (9) is arranged outside the stirring cage shell (4), and a cooling water inlet (17) and a cooling water outlet (14) are respectively arranged at two ends of the cooling jacket (9).

2. The novel slag cooler as set forth in claim 1, characterized in that: the cooling jacket (9) is a cavity sleeved outside the stirring cage shell (4), a cooling water inlet (17) of the cooling jacket (9) is arranged below one discharging end, and a cooling water outlet (14) is arranged above the other feeding end of the cooling jacket (9).

3. The novel slag cooler as set forth in claim 2, characterized in that: the cooling water inlet (17) is arranged off-center, and the cooling water inlet (17) is inclined towards the material outlet (16).

4. The novel slag cooler as set forth in claim 1, characterized in that: and a spiral baffle plate (18) which enables cooling water to flow to the outlet in a rotating manner is arranged between the cooling water inlet (17) and the cooling water outlet (14).

5. The novel slag cooler as set forth in claim 1, characterized in that: the spiral piece comprises a forward spiral piece (5) and a reverse spiral piece (10) which are respectively arranged at two sides of the material outlet (16).

6. The novel slag cooler as set forth in claim 5, characterized in that: the forward spiral piece (5) and the reverse spiral piece (10) respectively convey materials to the material outlet (16).

7. The novel slag cooler as set forth in claim 1, characterized in that: the stirring cage shell (4) is also provided with a feeding port (13).

8. The novel slag cooler as set forth in claim 1, characterized in that: the transmission mechanism comprises a speed reducing motor (1), one side of the speed reducing motor (1) is connected with a coupler (2), the coupler (2) is connected with a spiral piece, a speed reducing machine base (7) is further arranged under the speed reducing motor (1), and a middle machine base (8) is arranged at a position, close to the discharge hole, of the stirring cage shell (4).

9. The novel slag cooler as set forth in claim 7, characterized in that: the middle of the spiral sheet is provided with a transmission shaft, and the coupler (2) is fixedly connected with the transmission shaft.

10. The novel slag cooler as set forth in claim 1, characterized in that: the two ends of the stirring cage shell (4) are respectively provided with a head bearing (3) and a tail bearing (6).