CN219103725U

CN219103725U - Alumina particle cooler

Info

Publication number: CN219103725U
Application number: CN202320157306.2U
Authority: CN
Inventors: 蒋受宝; 周国章
Original assignee: Hunan Sequoia Energy Co ltd
Current assignee: Hunan Sequoia Energy Co ltd
Priority date: 2022-06-17
Filing date: 2023-02-08
Publication date: 2023-05-30
Anticipated expiration: 2033-02-08

Abstract

The utility model relates to an alumina particle cooler, which comprises a body with an inner cavity, wherein a material distribution mechanism, a plurality of heat exchange units and a discharging mechanism are sequentially distributed from top to bottom in the inner cavity, the top of the material distribution mechanism is provided with a material inlet, the material inlet is arranged on the body and communicated with the inner cavity, and the bottom of the discharging mechanism is provided with a material outlet; the heat exchange unit comprises 2 headers which are oppositely arranged, a pipe row is communicated between the 2 headers, cooling working media are filled in the headers and the pipe row, the pipe row comprises at least 2 heat exchange pipes which are distributed up and down, a plurality of fins are arranged on the heat exchange pipes, and the fins are uniformly distributed along the length direction of the heat exchange pipes. The alumina particle cooler has good cooling effect, larger material flow area and high treatment efficiency.

Description

Alumina particle cooler

Technical Field

The utility model relates to an alumina particle cooler, and belongs to the field of cooling equipment.

Background

In industry, coolers are often used to cool solid particles to obtain a solid particle product of a desired nature, for example, in the production of alumina, cooling of the calcined alumina is required. The roasting process is the last procedure of alumina production, and the main task of the production process is to calcine the aluminum hydroxide with the adhering water and the crystallization water in a roasting furnace at high temperature, and remove the adhering water and the crystallization water, thereby generating an alumina product with satisfactory physicochemical properties. The roasting production process is an important link for determining the yield, quality and energy consumption of the alumina, and the energy consumption accounts for about 10% of the energy consumption of the alumina production.

The roasting furnaces currently used in domestic alumina factories mainly comprise a gas suspension roasting furnace and a circulating fluidization roasting furnace. The temperature of the alumina cooled by the cyclone cooling system in the roasting furnace is generally above 200 ℃, and the alumina is required to be cooled to below 80 ℃ again by the fluidized bed cooler. The existing fluidized bed cooler uses compressed air to fluidize alumina powder through ventilation cloth, so as to exchange heat with a cooling pipe set arranged in a bed for cooling, and the cooling medium in the cooling pipe set is usually circulating cooling water.

Chinese patent No. CN201820149676.0 discloses a heat-collecting cooler for alumina powder effluent, which comprises a material inlet box, a heat-exchanging module, a frame and a material outlet box, wherein a distributor is arranged in the material inlet box, the material inlet box is connected with the upper part of the heat-exchanging module through a rectangular flange, and the pipe side is connected through a flange connecting short pipe; the lower part of the heat exchange module is provided with a discharge sieve plate valve, the discharge sieve plate valve is connected with the lower part of the heat exchange module through a rectangular flange by bolts, and the material outlet box body is connected with the lower part of the discharge sieve plate valve by bolts. The heat transfer element in the heat exchange module of the alumina powder outflow heat-taking cooler is an integral rolled sheet pipe, and the rolled sheet is of a continuous winding structure, so that the heat exchange area can be increased to a certain extent, but the flow area of the alumina powder can be influenced, the flow of the alumina powder in the alumina powder outflow heat-taking cooler is easy to be unsmooth, and the treatment efficiency is reduced.

Disclosure of Invention

In view of the shortcomings of the prior art, the utility model aims to provide an alumina particle cooler, which ensures good cooling effect and improves treatment efficiency.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

the alumina particle cooler comprises a body with an inner cavity, wherein a material distribution mechanism, a plurality of heat exchange units and a discharging mechanism are sequentially distributed from top to bottom in the inner cavity, a material inlet is formed in the top of the material distribution mechanism, the material inlet is arranged on the body and is communicated with the inner cavity, and a material outlet is formed in the bottom of the discharging mechanism; the heat exchange unit comprises 2 headers which are oppositely arranged, a pipe row is communicated between the 2 headers, cooling working media are filled in the headers and the pipe row, the pipe row comprises at least 2 heat exchange pipes which are distributed up and down, a plurality of fins are arranged on the heat exchange pipes, and the fins are uniformly distributed along the length direction of the heat exchange pipes.

Therefore, the fins on the heat exchange tube are mutually independent and uniformly arranged along the length direction of the heat exchange tube, so that the cooling heat exchange area can be greatly expanded, the heat transfer is enhanced, the flow area of the alumina particles is not influenced basically, and the good cooling effect is ensured. Meanwhile, the influence of the heated surface of the cooler adopting a spiral fin structure on the flow section of the alumina particles can be thoroughly solved, the heat exchange area is expanded, the heat transfer is enhanced, the material flow area is not influenced, the alumina particles in the cooler can smoothly circulate, the treatment capacity of the alumina particles in unit time is improved, and the treatment efficiency is improved.

The utility model provides an alumina particle cooler, includes the body that has the inner chamber, the intracavity is equipped with cloth mechanism, a plurality of heat transfer unit and the discharge mechanism that distributes from top to bottom in proper order, cloth mechanism's top is equipped with the feed inlet, the feed inlet sets up on the body and communicates with the inner chamber, discharge mechanism's bottom is equipped with the discharge gate.

Therefore, alumina particles to be cooled can be input into the inner cavity through the feeding hole, and then firstly pass through the distribution mechanism after entering the inner cavity, the distribution mechanism distributes the materials, so that the alumina particles fall down more uniformly, and are discharged out of the cooler through the discharging mechanism after entering the heat exchange unit for heat exchange and cooling. According to the utility model, the alumina particles can be uniformly distributed into the heat exchange unit, so that the heat exchange is uniform and sufficient, and a better cooling effect can be obtained.

Further, the heat exchange unit comprises 2 headers which are oppositely arranged, a pipe row is communicated between the 2 headers, cooling working media are filled in the headers and the pipe row, the pipe row comprises at least 2 rows of heat exchange pipes which are distributed up and down, and the overlapping ratio of orthographic projection of the upper adjacent 2 rows of heat exchange pipes and the lower adjacent 2 rows of heat exchange pipes on a horizontal plane is more than or equal to 0 and less than 100 percent.

Further, the overlap ratio of the orthographic projection of the upper and lower adjacent 2 rows of heat exchange tubes on the horizontal plane is more than or equal to 0 and less than 20 percent; furthermore, the overlap ratio of the orthographic projection of the upper and lower adjacent 2 rows of heat exchange tubes on the horizontal plane is more than or equal to 0 and less than 10 percent.

Alternatively, the included angle in the length direction of the upper and lower adjacent 2 rows of heat exchange tubes is 0-90 degrees, preferably 0 degrees.

As one implementation mode of the utility model, the number of the heat exchange units is a plurality of, and the heat exchange units are distributed from bottom to top in sequence and are communicated in sequence; the heat exchange unit with the lowest position is provided with a working medium inlet, and the heat exchange unit with the highest position is provided with a working medium outlet.

As another embodiment of the present utility model, the number of the heat exchange units is plural, and the heat exchange units are divided into 2 groups distributed up and down; the number of the heat exchange units is at least 1 in every 1 groups of heat exchange units, preferably, the number of the heat exchange units is at least 2 in every 1 groups of heat exchange units, and the heat exchange units are sequentially distributed from bottom to top and are sequentially communicated;

in the lower 1 group of heat exchange units, a first working medium inlet is arranged on the heat exchange unit with the lowest position, and a first working medium outlet is arranged on the heat exchange unit with the highest position;

and in the 1 groups of heat exchange units positioned above, the heat exchange unit positioned at the lowest position is provided with a second working medium inlet, and the heat exchange unit positioned at the highest position is provided with a second working medium outlet.

Further, the heat exchanger further comprises a first indirect heat exchanger and a second indirect heat exchanger, wherein the first indirect heat exchanger is provided with a first medium inlet, a first medium outlet, a second medium inlet and a second medium outlet, the first medium inlet is communicated with the first working medium outlet, and the first medium outlet is communicated with the first working medium inlet; the second indirect heat exchanger is provided with a third medium inlet, a third medium outlet, a fourth medium inlet and a fourth medium outlet, wherein the third medium inlet is communicated with the second working medium outlet, and the third medium outlet is communicated with the second working medium inlet.

As a further embodiment of the present utility model, the number of the heat exchange units is plural and is divided into 3 groups distributed up, down, and middle; the number of the heat exchange units is at least 1 in every 1 groups of heat exchange units, preferably, the number of the heat exchange units is at least 2 in every 1 groups of heat exchange units, and the heat exchange units are sequentially distributed from bottom to top and are sequentially communicated;

in the lower 1 group of heat exchange units, a third working medium inlet is arranged on the heat exchange unit with the lowest position, and a third working medium outlet is arranged on the heat exchange unit with the highest position;

in the 1 groups of heat exchange units positioned near the middle, a fourth working medium inlet is arranged on the heat exchange unit with the lowest position, and a fourth working medium outlet is arranged on the heat exchange unit with the highest position;

in the upper 1 group of heat exchange units, a fifth working medium inlet is arranged on the heat exchange unit with the lowest position, and a fifth working medium outlet is arranged on the heat exchange unit with the highest position.

Further, the system also comprises a third indirect heat exchanger and a flash tank, wherein the third indirect heat exchanger is provided with a fifth medium inlet, a fifth medium outlet, a sixth medium inlet and a sixth medium outlet, the fifth medium inlet is communicated with a third working medium outlet, and the fifth medium outlet is communicated with the third working medium inlet; the fourth working medium outlet is communicated with the fifth working medium inlet; the liquid inlet of the flash tank is communicated with the fifth working medium outlet, and the liquid outlet of the flash tank is communicated with the fifth working medium inlet.

Further, a plurality of fins are arranged on the heat exchange tube, and the fins are uniformly distributed along the length direction of the heat exchange tube; preferably, the fins are annular or H-shaped. The arrangement of the fins can greatly expand the cooling heat exchange area, strengthen the heat transfer, and simultaneously basically not influence the flow area of the alumina particles, thereby ensuring the cooling effect. Therefore, the influence of the heated surface of the cooler adopting the spiral fin structure on the flow section of the alumina particles can be thoroughly solved, the heat exchange area is expanded, the heat transfer is enhanced, and the material flow area is not influenced.

Further, the heat exchange unit is one or more of a single-flow heat exchanger, a double-flow heat exchanger, a three-flow heat exchanger, a four-flow heat exchanger and a five-flow heat exchanger.

Further, the distributing mechanism comprises a shell and a conical distributing screen plate which are distributed up and down, the feeding hole is formed in the shell, the feeding hole and the conical distributing screen plate share a central axis, and the conical distributing screen plate gradually inclines downwards from the central axis outwards; the shell is provided with a plurality of vibrating devices, and the output ends of the vibrating devices are abutted with the conical cloth sieve plate. Therefore, not only can uniform distribution be realized, but also massive slag materials, such as a fallen roasting furnace lining, can be blocked above the conical distribution sieve plate, thereby being beneficial to ensuring good cooling effect and avoiding blockage of the heat exchange unit. The conical material distribution sieve plate is adopted for distribution, and the height dimension of the material distribution mechanism is small, so that the space is saved.

The material distribution and separation of the powder and the large slag can be realized by real-time online vibration of the vibration device. The conical cloth sieve plate does not need to consider the stacking angle of alumina particles, and the height of the cloth mechanism can be greatly reduced.

Further, the included angle between the conical cloth sieve plate and the bottom surface is 1-45 degrees, and further 5-30 degrees.

Further, the bottom side of toper cloth sieve is equipped with the scarfing cinder pipe, one side that the scarfing cinder pipe is close to toper cloth sieve is equipped with the opening, toper cloth sieve is fixed in open-ended base department, the both ends of scarfing cinder pipe are equipped with the clearance door that can open and close respectively. So, slag charge on the toper cloth sieve can fall into the scarfing cinder intraductal, open the clearance door again as required, clear up can, need not to open the shell and can realize online clearance.

Optionally, the slag removing pipe is a steel pipe, preferably a seamless steel pipe.

Preferably, the slag removing pipe is provided with a sight glass. Thus, the enrichment condition of slag in the slag removal pipe can be conveniently observed, and measures can be timely taken.

Preferably, the sight glass is arranged at the middle position of the slag removing pipe so as to more conveniently observe the slag accumulation condition in the slag removing pipe.

Further, a material level sensor is arranged between the material distribution mechanism and the heat exchange unit so as to conveniently monitor the material level of alumina particles in the cooler.

Further, discharge mechanism includes a plurality of banding awl fights that are, the bottom that the awl fights is equipped with screw conveyer, screw conveyer extends along the length direction that the awl fights, screw conveyer's top and awl fight intercommunication, discharge gate and screw conveyer's discharge end intercommunication. Therefore, after the alumina particles fall into the cone hopper, the alumina particles are not naturally discharged through the discharge port, so that the certain material level height in the cooler is possible to be maintained, the retention time of the alumina particles in the cooler is better regulated and controlled, and a good cooling effect is ensured; meanwhile, alumina particles can be stably output to the outside of the cooler through the screw conveyor, and the discharging is stable and reliable, so that the phenomenon that the alumina particles in the cooler have stagnation areas is avoided. The lower part of the heat exchange module of the Chinese patent No. CN201820149676.0 is provided with a discharge sieve plate valve, when alumina powder flows down to the position of the discharge sieve plate valve, the alumina powder flows down from sieve holes, and no accumulation layer is formed on the discharge sieve plate valve, so that a certain material level height cannot be formed in the alumina powder effluent heat-taking cooler, the retention time of alumina particles in equipment is difficult to control, and further the regulation and control of the cooling effect are difficult to realize. Therefore, the utility model can also solve the problem that the cooling effect is difficult to regulate because the prior art such as CN201820149676.0 and the like can not regulate the residence time of the alumina particles in the cooling equipment.

Optionally, the discharging mechanism comprises a plurality of strip-shaped cone hoppers, and the cone hoppers are arranged in parallel. Therefore, the pressure of alumina particles in the cooler is shared, the intensity and the rigidity of the screw conveyors arranged in parallel are good, the screw conveyors are not required to be worried about overlarge pressure, the screw conveyors are prevented from running, and the discharging process is more stable and reliable.

Optionally, the cone angle of the cone hopper is 45-90 degrees so as to ensure the gravity fluidity of the alumina particle material; sealing bearings are arranged at the two ends of the screw conveyor, penetrating through the cone hopper, and are positioned in the cooled alumina powder. When the aluminum oxide powder discharging device works, the spiral conveyor is started, and the cooled aluminum oxide particle powder is discharged from the discharge hole.

Optionally, the number of cones is 2-3.

Optionally, the particles are alumina powder.

The alumina powder is cooled by the alumina particle cooler, so that the problems of the fluidized bed cooler in the existing alumina production process can be well solved. When the cooler needs to be maintained, alumina particles can be discharged cleanly by virtue of the gravity of the alumina particles and the action of the discharging mechanism, so that the loss of the alumina particles and the environmental pollution can be effectively avoided.

The alumina particle cooler has a simple and compact structure, and can omit a fluidization fan and a circulating water cooling tower; the heat recovered by the cooling medium can be used to heat other process fluids in production.

In the utility model, the heat exchange unit adopts a header type multi-tube row compact structure, more heat exchange tubes can be arranged compared with the same height of a heating surface of the serpentine tube structure, the height requirement of the radius of the bent tube is considered in a cooler of the serpentine tube structure, and the height of the heat exchange unit can be greatly reduced; the heat exchange tubes are arranged in staggered mode in the cooler and are communicated with the corresponding headers, the cross sections of the tube rows are arranged in a triangular mode, and the effects of disturbing and dispersing aluminum oxide particles, enhancing a heating surface and improving a heat exchange effect can be achieved.

A method of cooling alumina particles using an alumina particle cooler as described above, comprising the steps of: the alumina particles to be cooled are input into an alumina particle cooler through a feed inlet, and meanwhile, a distribution mechanism is started, so that the alumina particles to be cooled are dispersed and fall into a heat exchange unit; and controlling the discharging speed of the discharging mechanism according to the material level height in the alumina particle cooler.

Optionally, the alumina particles to be cooled are continuously fed into the alumina particle cooler through a feed port.

Further, the cooling method of the alumina particles comprises the following steps:

1) The method comprises the steps of inputting alumina particles to be cooled into an alumina particle cooler through a feed inlet, starting a material distribution mechanism, distributing materials through a conical material distribution sieve plate, vibrating the materials through a vibrating device, enabling powder materials with diameters smaller than meshes of the conical material distribution sieve plate to enter a heat exchange unit, enabling a screw conveyor to be in a closed state, enabling the powder materials with diameters larger than the meshes of the conical material distribution sieve plate to fall into a slag removal pipe after being vibrated by the vibrating device, observing slag conditions in the slag removal pipe through a sight glass, and cleaning the slag materials at two ends of the slag removal pipe on line at regular time;

2) According to the material level height in the alumina particle cooler, the discharging speed of the discharging mechanism is controlled, and the method can be specifically carried out according to the following strategy:

when the material level of the alumina particles in the alumina particle cooler reaches above the heat exchange unit (higher than the high material level), at the moment, each heat exchange tube of the heat exchange unit is coated by the material particles, the screw conveyor is gradually started, and the alumina particles flow downwards through gaps among the heat exchange tubes;

when the level of the alumina particles in the alumina particle cooler is between the high level and the low level, the rotating speed of the screw conveyor is regulated down;

when the level of alumina particles in the alumina particle cooler is at a low level, the screw conveyor is further turned down or shut down until the level of alumina particles reaches above the high level.

Compared with the prior art, the utility model has the following beneficial effects:

1. the alumina particle cooler has good cooling effect and larger material flow area, and is beneficial to improving the treatment capacity in unit time and further improving the treatment efficiency.

2. When the alumina particle cooler is used for cooling powder materials, the powder materials flow through the heat exchange unit from top to bottom through the dead weight, external power is not needed to push the powder to flow, the power consumption of a fluidized screw blower of the existing fluidized bed cooler is saved, and the production cost of enterprises is reduced; under the condition of ensuring smooth discharging, powder materials can freely flow downwards through gaps among the heat exchange pipes through high and low material level control and a staggered heat exchange pipe row structure, the staggered heat exchange pipes play a role in disturbing the powder materials, so that powder material particles are fully contacted with a heating surface of the heat exchange pipes, gravity flow heat transfer of the powder materials is enhanced, uniform material cooling is ensured, and the heat exchange efficiency of a cooler is improved.

3. The material distributing mechanism of the alumina particle cooler adopts the conical material distributing sieve plate, and vibration is adopted to realize vibration material distribution and separation of materials, so that the overall height can be greatly reduced. The heat exchange unit adopts a header type multi-tube row compact structure, so that the problem that the elbow of the serpentine tube cooler needs a larger space with a radius of the elbow is solved, and the height of the heat exchange unit module tube group can be greatly reduced. The structure can effectively solve the problem of space height of the cyclone cooling discharge hole of the roasting furnace in the existing alumina production process.

4. In the alumina particle cooler, the periphery of the lower end of the conical material distribution sieve plate is provided with the mutually communicated slag removing pipes, and the two ends of the slag removing pipes are respectively provided with the cleaning doors, so that large-particle slag (the pouring material falling blocks of the lining of the roasting furnace and the like) can be cleaned on line and quickly under the condition that the operation of the cooler is not influenced, continuous and smooth equipment blanking is ensured, and the system operation is stable and reliable.

5. The discharging mechanism of the alumina particle cooler mainly comprises a cone hopper and a screw conveyor arranged at the bottom of the cone hopper, and is stable and reliable in discharging, and can avoid stagnation areas of alumina particles of the heat exchange unit module; has better strength and rigidity, and can meet the requirement of keeping a certain material level height in the cooler.

6. When the alumina particle cooler is maintained or replaced, only alumina particle powder of the heat exchange unit is discharged through the discharging mechanism, the operation is convenient and quick, the construction period time is short, and environmental pollution and waste are avoided.

7. The alumina particle cooler of the present utility model eliminates a circulating water cooling tower and the recovered cooling heat can be used to heat the process media fluid in production. In order to meet the production process requirements in the factory, the heat exchange unit flow can be combined according to the requirements. Different heat exchange requirements are achieved by heating different process medium fluids. The equipment is convenient to use, and can heat different process medium fluids in a sectioned way or produce low-pressure saturated steam.

7. The alumina particle cooler is simple and convenient to operate, can realize automatic control, and is simpler to maintain. Compared with the prior fluidized bed, the later maintenance cost is greatly reduced, and a large amount of operation cost is saved for enterprises.

In summary, the alumina particle cooler provided by the utility model has the advantages that the distribution mechanism, the heat exchange unit and the discharge mechanism are arranged, so that gravity flow of alumina particles without external force can be realized, reinforced heat exchange is realized, the structure is compact, the space is saved, the manufacture, the transportation, the installation and the maintenance are convenient, the popularization and the implementation are easy, the energy conservation and the emission reduction are realized, the heat recovery can be effectively performed, the national relevant environmental protection policy is met, the production cost of enterprises is reduced, and the economic benefit of the enterprises is improved.

Drawings

Fig. 1 is a general structural view of an alumina particle cooler of the present utility model.

Fig. 2 is a schematic diagram of an assembled structure of a slag removing pipe of an alumina particle cooler according to the present utility model.

Fig. 3 is a side view of the open side of a slag removing pipe of the present utility model.

Fig. 4 is a sectional view taken along line B-B in fig. 3.

Fig. 5 is an enlarged view of a cleaning gate of a slag removing pipe according to the present utility model.

Fig. 6 is a top view of a heat exchange tube of the present utility model.

Fig. 7 is a side view of a heat exchange tube of the present utility model.

Fig. 8 is a side view of another heat exchange tube of the present utility model.

Fig. 9 is a top view of a single pass heat exchange unit of the present utility model.

Fig. 10 is a top view of a dual pass heat exchange unit of the present utility model.

Fig. 11 is a top view of a three-pass heat exchange unit of the present utility model.

Fig. 12 is a top view of a four-pass heat exchange unit of the present utility model.

Fig. 13 is a top view of a five-pass heat exchange unit of the present utility model.

Fig. 14 is a schematic diagram showing the distribution of the heat exchange unit of embodiment 2 of the present utility model.

Fig. 15 is a schematic diagram showing the distribution of the heat exchange unit of embodiment 3 of the present utility model.

Fig. 16 is a schematic diagram showing the distribution of the heat exchange unit of embodiment 4 of the present utility model.

Fig. 17 is a schematic view of the internal structure of a discharge mechanism of the present utility model.

Detailed Description

The present utility model will be described in detail with reference to examples. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

Example 1

Referring to fig. 1 to 5, an alumina particle cooler comprises a control unit, a steel frame 4 and a body with an inner cavity, wherein a distributing mechanism 1, a plurality of heat exchange units 2 and a discharging mechanism 3 which are distributed from top to bottom are arranged in the inner cavity, the top of the distributing mechanism 1 is provided with a feeding port 1.1, the feeding port 1.1 is arranged at the top of the body and is communicated with the inner cavity, and the bottom of the discharging mechanism 3 is provided with a discharging port 3.3; the heat exchange unit 2 comprises a hollow box body 2.2 and 2 headers 2.1 which are oppositely arranged, a tube bank is communicated between the 2 headers 2.1, cooling working media are filled in the headers 2.1 and the tube bank, the tube bank comprises at least 2 rows of heat exchange tubes 2.3 which are distributed up and down, and the overlap ratio of orthographic projection of the upper adjacent 2 rows of heat exchange tubes 2.3 on a horizontal plane is 0. The distributing mechanism 1, the plurality of heat exchange units 2 and the discharging mechanism 3 are all supported on the steel frame 4. Each header 2.1 is fixed to the outer side wall of the tank 2.2. The shell and the box body 2.2 are connected to form a body, and the shell, the box body and the discharging mechanism enclose an inner cavity of the body.

The number of the heat exchange units 2 is multiple, and the heat exchange units are distributed from bottom to top in sequence and are communicated in sequence; the lowest heat exchange unit 2 is provided with a working medium inlet 2.5, and the highest heat exchange unit 2 is provided with a working medium outlet 2.4. The upper heat exchange unit 2 and the lower heat exchange unit 2 are communicated through a connecting pipe 5.

Referring to fig. 6 to 8, a plurality of fins 2.31 are arranged on the heat exchange tube 2.3, and the fins 2.31 are uniformly distributed along the length direction of the heat exchange tube 2.3; the fins 2.31 are annular or H-shaped.

Referring to fig. 9 to 13, the heat exchange unit 2 is one or more of a single-flow heat exchanger, a double-flow heat exchanger, a three-flow heat exchanger, a four-flow heat exchanger and a five-flow heat exchanger, and optionally, a separation sheet 2.15 is arranged in the header 2.1 to separate the heat exchange unit into corresponding flows. The heat exchange unit 2 can be arranged by one or a combination of several of the processes according to the requirement of ensuring the flow rate of the cooling working medium in the tube side to be more than 0.5 m/s.

The material distribution mechanism 1 comprises a shell 1.3 and a conical material distribution sieve plate 1.6 which are distributed up and down, the material inlet 1.1 is arranged on the shell 1.3, the material inlet 1.1 and the conical material distribution sieve plate 1.6 are concentric with each other, the conical material distribution sieve plate 1.6 gradually inclines downwards from the central axis outwards, and thus the top end of the conical material distribution sieve plate is positioned in the middle position of the material inlet; the shell 1.3 is provided with a plurality of vibrating devices 1.2 which are uniformly distributed around the central axis, the output end of the vibrating device 1.2 is abutted with the conical cloth screen plate 1.6, and the output end of the vibrating device 1.2 is abutted with the middle position of the conical cloth screen plate 1.6 (namely, the middle position between the top end and the bottom edge of the conical cloth plate); the bottom side of the conical cloth screen plate 1.6 is provided with 4 slag removing pipes 1.5, the 4 slag removing pipes are sequentially communicated and form a rectangular structure, one side, close to the conical cloth screen plate 1.6, of each slag removing pipe 1.5 is provided with an opening 1.51, the angle A spanned by the opening 1.51 in the circumferential direction of the slag removing pipe is 90 degrees, the conical cloth screen plate 1.6 is fixed at the bottom edge of the opening 1.51, and two ends of each slag removing pipe 1.5 are respectively provided with a cleaning door 1.52 which can be opened and closed; a sight glass 1.8 is arranged in the middle of the slag removing pipe 1.5; a material level sensor 1.7 is arranged between the material distributing mechanism 1 and the heat exchanging unit 2. The shell 1.3 is provided with a manhole 1.4 to facilitate maintenance.

The discharging mechanism 3 comprises 3 strip-shaped cone hoppers 3.1, a screw conveyer 3.2 is arranged at the bottom of each cone hopper 3.1, each screw conveyer 3.2 extends along the length direction of each cone hopper 3.1, the top of each screw conveyer 3.2 is communicated with each cone hopper 3.1, and the discharging port 3.3 is communicated with the discharging end of each screw conveyer 3.2. The other end of the screw conveyor 3.2 is provided with a driving motor in transmission connection with the screw conveyor and used for driving the screw conveyor to operate.

The control unit is respectively and electrically connected with the vibrating device 1.2, the screw conveyor and the material level sensor 1.7 so as to control and regulate the material distribution mechanism and the material discharging mechanism. The control unit controls the rotational speed of the screw conveyor 3.2 on the basis of the sampling information of the level sensor 1.7.

The alumina particles are cooled using the alumina particle cooler described above. The feed inlet 1.1 is connected with the outlet of a cyclone cooler of the roasting furnace.

When the alumina particle cooler is used for cooling the alumina particles, the method comprises the following steps:

when the material level of the alumina particles in the alumina particle cooler reaches above the heat exchange unit (when the material level is higher than the high material level, the specific position of the high material level can be defined according to the requirement, for example, the position above the heat exchange unit is defined as the high material level), at the moment, each heat exchange tube of the heat exchange unit is coated by the material particles, the spiral conveyor is gradually started, and the alumina particles flow downwards through gaps among the heat exchange tubes;

when the level of alumina particles in the alumina particle cooler is at a low level (the specific position may be defined as desired, e.g. the position below the heat exchange unit is defined as a low level), the screw conveyor is further turned down or shut down until the level of alumina particles reaches above the high level.

Example 2

Example 1 was repeated with the difference that: referring to fig. 14, the number of the heat exchange units 2 is plural, the cooling working medium is low-temperature clean process fluid (desalted water, aluminum hydroxide washing water and the like), and the temperature of the cooling working medium is less than or equal to 65 ℃.

Example 3

Example 1 was repeated with the difference that: referring to fig. 15, the number of the heat exchange units 2 is plural, and is divided into 2 groups distributed up and down; in each 1 group of heat exchange units 2, the number of the heat exchange units 2 is at least 2, and the heat exchange units are distributed from bottom to top in sequence and are communicated in sequence;

in the lower 1 group of heat exchange units 2, the number of the heat exchange units 2 is multiple, the lowest heat exchange unit 2 is provided with a first working medium inlet 2.51, and the highest heat exchange unit 2 is provided with a first working medium outlet 2.41;

in the upper 1 group of heat exchange units 2, the number of the heat exchange units 2 is multiple, the lowest heat exchange unit 2 is provided with a second working medium inlet 2.52, and the highest heat exchange unit 2 is provided with a second working medium outlet 2.42.

The heat exchange system further comprises a first indirect heat exchanger 2.6 and a second indirect heat exchanger 2.7, wherein the first indirect heat exchanger 2.6 is provided with a first medium inlet, a first medium outlet, a second medium inlet and a second medium outlet, the first medium inlet is communicated with a first working medium outlet 2.41, the first medium outlet is communicated with a first working medium inlet 2.51, and a first pump 2.8 is arranged between the first medium outlet and the first working medium inlet 2.51; the second indirect heat exchanger 2.7 is provided with a third medium inlet, a third medium outlet, a fourth medium inlet and a fourth medium outlet, the third medium inlet is communicated with the second working medium outlet 2.42, the third medium outlet is communicated with the second working medium inlet 2.52, and a second pump 2.9 is arranged between the third medium outlet and the second working medium inlet 2.52. The first indirect heat exchanger 2.6 and the second indirect heat exchanger 2.7 are both plate heat exchangers.

For the upper group 1 of heat exchange units 2, circulating heat medium soft water is used as a cooling working medium, and the heat of the circulating heat medium soft water is recovered to heat process fluid (mother solution, stock solution, liquid alkali and the like) in the alumina production process; for the group 1 heat exchange units 2 positioned at the lower part, circulating heat medium soft water is used as cooling working medium, so as to protect the inner wall of the heat exchange tube from pollution and scaling. The circulating cooling water is exposed to the environment, so that the water quality is dirty, the water quality in some places is hard, scaling is easy to occur after the circulating cooling water runs, the inner wall of the heat exchange tube can be well protected from scaling by adopting indirect cooling, and the indirect cooling plate heat exchanger has high heat exchange coefficient and is convenient to clean and maintain. In the concrete implementation, the cooling working medium of the upper 1 group of heat exchange units 2 is closed circulation heat medium soft water, is heated (110-120 ℃) after heat exchange with alumina powder through a heat exchange tube, is subjected to indirect heat exchange with cold source media (process fluid: mother liquor, stock solution, liquid alkali and the like) in a second indirect heat exchanger to cool (90 ℃) and is continuously circulated in a closed mode by a second pump 2 9; the cooling working medium of the lower 1 group of heat exchange units 2 is closed circulation heat medium soft water, is heated (about 55 ℃) after heat exchange with alumina powder through a heat exchange tube, is subjected to indirect heat exchange with cold source medium (circulating cooling water) in a first indirect heat exchanger, is cooled (about 45 ℃) and is continuously circulated in a closed mode through a first pump 2 8. Therefore, the heat exchange cooling is continuously carried out on the alumina powder in the cooler, and the discharge temperature of the alumina powder is ensured to be below 80 ℃.

Example 4

Example 1 was repeated with the difference that: referring to fig. 16, the number of the heat exchange units 2 is plural, and is divided into 3 groups distributed up, down, and middle; in each 1 group of heat exchange units 2, the number of the heat exchange units 2 is at least 2, and the heat exchange units are distributed from bottom to top in sequence and are communicated in sequence;

in the lower 1 group of heat exchange units 2, the number of the heat exchange units 2 is multiple, a third working medium inlet 2.53 is arranged on the heat exchange unit 2 with the lowest position, and a third working medium outlet 2.43 is arranged on the heat exchange unit 2 with the highest position;

in the 1 groups of heat exchange units 2 positioned near the middle, the number of the heat exchange units 2 is multiple, a fourth working medium inlet 2.54 is arranged on the heat exchange unit 2 with the lowest position, a fourth pump 2.13 is communicated with the fourth working medium inlet 2.54, and a fourth working medium outlet 2.44 is arranged on the heat exchange unit 2 with the highest position;

in the upper 1 group of heat exchange units 2, the number of the heat exchange units 2 is multiple, a fifth working medium inlet 2.55 is arranged on the heat exchange unit 2 with the lowest position, and a fifth working medium outlet 2.45 is arranged on the heat exchange unit 2 with the highest position.

The system further comprises a third indirect heat exchanger 2.10 and a flash tank 2.11, wherein the third indirect heat exchanger 2.10 is provided with a fifth medium inlet, a fifth medium outlet, a sixth medium inlet and a sixth medium outlet, the fifth medium inlet is communicated with a third working medium outlet 2.43, the fifth medium outlet is communicated with a third working medium inlet 2.53, and a third pump 2.12 is arranged between the fifth medium outlet and the third working medium inlet 2.53; the fourth working medium outlet 2.44 is communicated with the fifth working medium inlet 2.55; the liquid inlet of the flash tank 2.11 is communicated with the fifth working medium outlet 2.45, the liquid outlet of the flash tank 2.11 is communicated with the fifth working medium inlet 2.55, a fifth pump 2.14 is arranged between the liquid outlet of the flash tank 2.11 and the fifth working medium inlet 2.55, and the fourth working medium outlet 2.44 is communicated on a pipeline between the flash tank 2.11 and the fifth pump 2.14. The third indirect heat exchanger 2.10 is a plate heat exchanger.

In the embodiment, the cooling of the alumina powder material is performed in three stages, and when the low-grade waste heat is applied and the low-pressure saturated steam is produced: the high temperature section (1 group of heat exchange units 2 positioned above the corresponding position) is cooled by adopting circulating heat medium soft water, and the heat is recovered to produce low-pressure saturated steam; the middle temperature section (1 group of heat exchange units 2 positioned near the middle) is cooled by soft water or desalted water, and the heat is recovered and used for supplementing water to the high temperature section; the low-temperature section (1 group of heat exchange units 2 which are positioned at the lower part) adopts circulating heat medium soft water to indirectly cool through a plate heat exchanger, so as to protect the inner wall of the low-temperature Duan Huanre pipe from pollution and scaling. The circulating cooling water is exposed to the environment, so that the water quality is dirty, the water quality in some places is hard, scaling is easy to occur after the circulating cooling water runs, the inner wall of the low-temperature Duan Huanre pipe can be well protected from scaling by adopting indirect cooling, and the indirect cooling plate heat exchanger has high heat exchange coefficient and is convenient to clean and maintain. In the concrete implementation, the cooling working medium of the high-temperature section heat exchange unit 2 is closed circulation heat medium soft water, the temperature is raised (about 204 ℃) after heat exchange between a heat exchange pipe and alumina powder, the soft water enters a flash tank for depressurization and flash evaporation, low-pressure saturated steam (about 140 ℃) is produced for a production system, and the saturated water (about 140 ℃) after flash evaporation is continuously and closed circulated by a fifth pump 2.14; the cooling working medium of the heat exchange unit 2 in the medium temperature section is soft water or desalted water, the pressure is increased by the fourth pump 2.13, the temperature is increased after heat exchange between the heat exchange pipe and the alumina powder, and water is supplemented to the high temperature section system; the cooling working medium of the heat exchange unit 2 in the low temperature section is closed circulation heat medium soft water, the temperature is raised (about 110 ℃) after heat exchange with alumina powder by a heat exchange tube, and then the heat exchange with a cold source medium (circulating cooling water) is reduced (about 65 ℃) and the closed circulation is continuously carried out by a third pump 2 12. Therefore, the heat exchange cooling is continuously carried out on the alumina powder in the cooler, and the discharge temperature of the alumina powder is ensured to be below 80 ℃.

The foregoing examples are set forth in order to provide a more thorough description of the present utility model, and are not intended to limit the scope of the utility model, since modifications of the utility model in various equivalent forms will occur to those skilled in the art upon reading the present utility model, and are within the scope of the utility model as defined in the appended claims.

Claims

1. The utility model provides an alumina particle cooler, includes the body that has the inner chamber, be equipped with distributing mechanism (1), a plurality of heat transfer unit (2) and discharge mechanism (3) that distribute from top to bottom in proper order in the inner chamber, the top of distributing mechanism (1) is equipped with feed inlet (1.1), feed inlet (1.1) set up on the body and with the inner chamber intercommunication, the bottom of discharge mechanism (3) is equipped with discharge gate (3.3); the heat exchange unit is characterized in that the heat exchange unit (2) comprises 2 headers (2.1) which are oppositely arranged, a tube bank is communicated between the 2 headers (2.1), cooling working media are filled in the headers (2.1) and the tube bank, the tube bank comprises at least 2 rows of heat exchange tubes (2.3) which are distributed up and down, a plurality of fins (2.31) are arranged on the heat exchange tubes (2.3), and the fins (2.31) are uniformly distributed along the length direction of the heat exchange tubes (2.3).

2. Alumina particle cooler according to claim 1, characterized in that the fins (2.31) are annular or H-shaped.

3. Alumina particle cooler according to claim 1 or 2, characterized in that the overlap of the orthographic projections of the upper and lower adjacent 2 rows of heat exchange tubes (2.3) on the horizontal plane is more than or equal to 0 and less than 100%.

4. The alumina particle cooler according to claim 1 or 2, wherein the number of heat exchange units (2) is plural and distributed and communicated sequentially from bottom to top; the heat exchange unit (2) with the lowest position is provided with a working medium inlet (2.5), and the heat exchange unit (2) with the highest position is provided with a working medium outlet (2.4).

5. The alumina particle cooler according to claim 1 or 2, characterized in that the number of heat exchange units (2) is plural and divided into 2 groups distributed up and down; in every 1 group of heat exchange units (2), the number of the heat exchange units (2) is at least 1.

6. The alumina particle cooler according to claim 1 or 2, characterized in that the number of heat exchange units (2) is plural and divided into 3 groups distributed up, down, and in middle; in every 1 group of heat exchange units (2), the number of the heat exchange units (2) is at least 1.

7. Alumina particle cooler according to claim 1 or 2, characterized in that the distribution mechanism (1) comprises a shell (1.3) and a conical distribution screen plate (1.6) which are distributed up and down, the feed inlet (1.1) is arranged on the shell (1.3), the feed inlet (1.1) and the conical distribution screen plate (1.6) are concentric, and the conical distribution screen plate (1.6) gradually inclines outwards and downwards from the central axis; a plurality of vibrating devices (1.2) are arranged on the shell (1.3), and the output ends of the vibrating devices (1.2) are abutted with the conical cloth sieve plate (1.6).

8. The alumina particle cooler according to claim 7, wherein a slag removing pipe (1.5) is arranged at the bottom side of the conical cloth screen plate (1.6), an opening (1.51) is arranged at one side of the slag removing pipe (1.5) close to the conical cloth screen plate (1.6), the conical cloth screen plate (1.6) is fixed at the bottom edge of the opening (1.51), and cleaning doors (1.52) capable of being opened and closed are respectively arranged at two ends of the slag removing pipe (1.5).

9. Alumina particle cooler according to claim 1 or 2, characterized in that a level sensor (1.7) is arranged between the distribution mechanism (1) and the heat exchange unit (2).

10. Alumina particle cooler according to claim 1 or 2, characterized in that the discharge mechanism (3) comprises a plurality of strip-shaped cone hoppers (3.1), a screw conveyor (3.2) is arranged at the bottom of each cone hopper (3.1), the screw conveyor (3.2) extends along the length direction of each cone hopper (3.1), the top of each screw conveyor (3.2) is communicated with each cone hopper (3.1), and the discharge port (3.3) is communicated with the discharge end of each screw conveyor (3.2).