CN219141625U - Circulation cleaning system of fluidized bed heat exchanger - Google Patents
Circulation cleaning system of fluidized bed heat exchanger Download PDFInfo
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- CN219141625U CN219141625U CN202222852026.1U CN202222852026U CN219141625U CN 219141625 U CN219141625 U CN 219141625U CN 202222852026 U CN202222852026 U CN 202222852026U CN 219141625 U CN219141625 U CN 219141625U
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Abstract
The utility model relates to the technical field of chemical equipment, and discloses a circulating cleaning system of a fluidized bed heat exchanger, wherein the fluidized bed heat exchanger is provided with a feed inlet and a discharge outlet, the feed inlet is used for feeding a liquid-solid mixture containing solid particles and circulating liquid, and the discharge outlet is used for discharging the cleaned liquid-solid mixture to be treated; the cleaning unit is communicated with the discharge port and is used for cleaning solid particles in the liquid-solid mixture to be treated; the mixing unit is communicated with the cleaning unit and is provided with a circulating liquid inlet for feeding circulating liquid and used for mixing the circulating liquid and the cleaned solid particles; the conveying unit comprises a particle conveying pipe provided with a nondestructive particle conveying pump, one end of the particle conveying pipe is communicated with the mixing unit, and the other end of the particle conveying pipe is communicated with a feed inlet of the fluidized bed heat exchanger and used for conveying the cleaned solid particles and circulating liquid into the fluidized bed heat exchanger. The utility model has the advantages of improving the stability of the circulation of particles in the fluidized bed heat exchanger and prolonging the long-period running of the device.
Description
Technical Field
The utility model relates to the technical field of chemical equipment, in particular to a circulating cleaning system of a fluidized bed heat exchanger.
Background
Heat exchangers are widely used in petroleum, chemical, energy industries, and the like. However, as the service time increases, dirt adhesion phenomenon is inevitably present in the heat exchanger, so that the heat exchange efficiency of the heat exchanger is reduced, the resistance is increased, and the normal operation of the heat exchanger is affected.
The particle recycling method of the self-cleaning fluidized bed heat exchanger is developed, has the advantages of high particle recycling rate, energy conservation and environmental protection, and can effectively improve the economic benefit of production enterprises.
Whether the solid particles can effectively circulate and uniformly distribute in the fluidized bed heat exchanger in the liquid phase flow velocity range of the heat exchanger is a precondition for restricting the normal operation and large-scale industrial application of the fluidized bed heat exchanger. In the traditional external circulation type fluidized bed heat exchanger, due to pipeline resistance and distribution thereof, solid particles are easily sealed by a liquid column to which a horizontal pipe flows in a circulation process in a downcomer, so that the pipeline fluid of the downcomer is locally short-circuited, the effective circulation of the solid particles is prevented, and the application of the external circulation type fluidized bed heat exchanger is influenced. Document CN202709856U discloses a horizontal liquid-solid circulating fluidized bed heat exchanger using a Kenics static mixer. The fluidized bed heat exchanger solid particles cannot be effectively circulated and can only be used for a horizontal heat exchanger. Document US6350928 discloses an external circulation fluidized bed heat exchanger, which is not provided with a definite solid particle circulation member, and which has a poor ability to maintain a heat transfer effect or cannot normally operate in an operation cycle. Document CN102921179 discloses an external circulation type fluidized bed heat exchanger, which adopts a reducing nozzle between a down pipe and a horizontal pipe to generate negative pressure to realize circulation of solid particles, and the external circulation type fluidized bed heat exchanger of the structure relates to a nozzle structure, and has smaller elastic space for matched process condition operation, so that effective circulation of the solid particles is difficult to realize.
Disclosure of Invention
The utility model aims to solve the problems that particles of a fluidized bed heat exchanger cannot be recycled continuously and the cleaning effect is poor due to uneven particle distribution in the prior art, and provides a circulating cleaning system of the fluidized bed heat exchanger, which has the advantages of improving the circulating stability of the particles in the fluidized bed heat exchanger and prolonging the long-period running of a device.
In order to achieve the above object, the present utility model provides a circulation cleaning system for a fluidized bed heat exchanger, the circulation cleaning system comprising:
the fluidized bed heat exchanger is provided with a feed inlet and a discharge outlet, the feed inlet is used for feeding a liquid-solid mixture which is used as a cleaning object and contains solid particles and cleaning circulating liquid, and the discharge outlet is used for discharging the cleaned liquid-solid mixture to be treated;
the cleaning unit is communicated with the discharge port and is used for cleaning solid particles in the liquid-solid mixture to be treated to obtain cleaned solids;
a mixing unit which is communicated with the cleaning unit and is provided with a circulating liquid inlet for feeding a circulating liquid, and is used for mixing the cleaning circulating liquid, new solid particles and/or the cleaned solid from the cleaning unit;
the conveying unit comprises a particle conveying pipe provided with a nondestructive particle conveying pump, one end of the particle conveying pipe is communicated with the mixing unit, and the other end of the particle conveying pipe is communicated with a feed inlet of the fluidized bed heat exchanger and is used for conveying materials of the mixing unit into the fluidized bed heat exchanger.
Preferably, the conveying unit comprises an auxiliary branch pipe communicated with the feed inlet of the fluidized bed heat exchanger, and a branch pipe pump is arranged on the auxiliary branch pipe and used for supplementing liquid to increase the flow rate entering the fluidized bed heat exchanger.
Preferably, the lossless particle transfer pump is a tesla pump.
Preferably, the lower pipe box of the fluidized bed heat exchanger is provided with a mixing structure formed into a feed inlet, the mixing structure comprises a shell and a closed cavity formed by surrounding the shell, the closed cavity is communicated with the auxiliary branch pipe, the top wall of the closed cavity is provided with an orifice plate with a plurality of distribution holes, and the particle conveying pipe axially extends into the closed cavity and penetrates through the orifice plate;
and the supplementary liquid in the auxiliary branch pipe is pumped into the closed cavity and sprayed out of the distribution holes to be mixed with the cleaned solid particles and circulating liquid sprayed out of the particle conveying pipe.
Preferably, the pore plate has a porosity S of 0.2 to 1.
Preferably, a plurality of said distribution holes are arranged symmetrically about the outlet center of said particle transport tube.
Preferably, a plurality of said distribution holes are arranged in a circle, diamond, regular hexagon or regular octagon.
Preferably, the distribution holes are provided with a filter screen, and the ratio R of the pore diameter of the filter screen to the particle diameter of the solid particles 2 0 to 1.
Preferably, the ratio R of the outer diameter of the auxiliary branch pipe to the pipe diameter of the lower pipe box of the fluidized bed heat exchanger 1 0.4 to 1.
Preferably, the outlet height R of the particle transport tube 3 The lower pipe box of the fluidized bed heat exchanger is positioned at 0 to 1/6 of the position from bottom to top.
Preferably, the cleaning unit includes:
the liquid-solid separator is communicated with a discharge port of the fluidized bed heat exchanger;
the cleaning device is communicated with a particle discharge port of the liquid-solid separator and a cleaning liquid feed pipeline.
Preferably, the circulation cleaning system comprises a liquid reservoir in communication with the liquid outlet of the liquid-solid separator.
Preferably, the mixing unit comprises a liquid-solid mixing device provided with the circulating liquid inlet and the solid particle feed inlet and communicating with the cleaning device and the particle delivery pipe, and the liquid-solid mixing device is provided with a stirring device.
Preferably, a distributor is arranged in the lower pipe box of the fluidized bed heat exchanger, and the distributor is selected from one of a flat plate type, a tarpaulin head type, a rotary vane type or a rotary vane type.
Preferably, the circulating liquid inlet is in communication with a circulating liquid feed line and/or a liquid reservoir.
Preferably, the mounting height R of the distributor 4 The lower pipe box of the fluidized bed heat exchanger is arranged at the position of 1/3-2/3 from bottom to top.
Through the technical scheme, solid particles are hydraulically conveyed by the lossless particle conveying pump, so that the process flow of the traditional self-cleaning fluidized bed heat exchanger is simplified, the stability of the particles circulating in the fluidized bed heat exchanger is improved, and the long-period operation of the device is prolonged; the auxiliary branch pipe supplements the kinetic energy of liquid-solid particles from the particle conveying pipe to strengthen the uniform distribution and stable circulation of the particles in the self-cleaning fluidized bed heat exchanger.
Drawings
FIG. 1 is a schematic view of the circulation cleaning system of the fluidized bed heat exchanger of the present utility model;
fig. 2 is a top view of the hybrid structure of fig. 1.
Description of the reference numerals
1 a fluidized bed heat exchanger; 2, a nondestructive particle delivery pump; 3 a liquid-solid mixing device; 4, a liquid-solid separator; 5, cleaning the device; 6, a liquid storage tank; 7, discharging the pipe box; 8 branch pipe pumps; 9 auxiliary branch pipes; 10 particle delivery tube; 11 a distributor; 12 solid particle feed inlet; 13 a cleaning liquid feed line; 20 a hybrid structure; 21-hole plate
Detailed Description
The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.
In the present utility model, unless otherwise indicated, terms of orientation such as "up, down, left, right" are used to refer generally to the directions shown in the drawings or to describe the positional relationship of the various components with respect to the vertical, vertical or gravitational directions, which are the directions of height or gravitational forces in the present utility model. The utility model only takes the tube side of the cleaning tube type heat exchanger as an example to illustrate the advantages of the utility model, but the utility model is not limited to the tube side of the cleaning fluidized bed heat exchanger, and the material inlet and outlet of the liquid-solid mixture can be communicated with the shell side according to the actual use requirement so as to clean the shell side.
As shown in fig. 1, the present utility model provides a circulation cleaning system for a fluidized bed heat exchanger, the circulation cleaning system comprising: the fluidized bed heat exchanger 1 comprises an upper pipe box, a lower pipe box and a pipe box which is arranged between the upper pipe box and the lower pipe box and is provided with a pipe array tube, wherein a feed inlet is arranged on the lower pipe box and is used for feeding a liquid-solid mixture which is taken as a cleaning object and contains solid particles and cleaning circulating liquid, the liquid-solid mixture enters the pipe array tube along with the circulating liquid, the wall of a pipeline is scraped, the liquid-solid mixture flowing out of the pipe array tube becomes a liquid-solid mixture to be treated, the liquid-solid mixture is discharged from a discharge hole arranged on the upper pipe box and enters a cleaning unit to be subjected to washing treatment, and then the liquid-solid mixture is circulated back to the fluidized bed heat exchanger; wherein the flow speed operation range of circulating liquid in a heat exchanger tube array of the fluidized bed heat exchanger is 0.8 m/s-4 m/s;
the cleaning unit is communicated with the discharge port and is used for separating solid particles in the liquid-solid mixture to be treated and cleaning the solid particles to obtain cleaned solid;
the mixing unit is communicated with the cleaning unit and is provided with a circulating liquid inlet for feeding cleaning circulating liquid, and is used for mixing the cleaning circulating liquid, new solid particles and/or the cleaned solid from the cleaning unit;
the conveying unit comprises a particle conveying pipe 10 provided with a nondestructive particle conveying pump 2, one end of the particle conveying pipe 10 is communicated with the mixing unit, and the other end of the particle conveying pipe is communicated with a feed inlet of the fluidized bed heat exchanger 1 and is used for conveying materials of the mixing unit into the fluidized bed heat exchanger 1.
Compared with the circulating equipment using a 'liquid-solid separator, a descending pipe, a three-way pipe and a horizontal pipe' in the prior art, the utility model realizes the conveying of the unbroken solid particles and the stable circulating distribution of the particles in the heat exchanger through the lossless particle conveying pump, and compared with the circulating equipment using the 'liquid-solid separator, the descending pipe, the three-way pipe and the horizontal pipe', the solid particles enter the lower pipe box of the shell-and-tube heat exchanger from bottom to top, flow through the shell-and-tube heat exchanger from bottom to top, flow out of the pipe orifice at the upper end of the shell-and-tube heat exchanger and enter the liquid-solid separator, the solid particles separated in the liquid-solid separator enter the descending pipe, and the solid particles flowing out of the descending pipe are conveyed into the shell-and-tube heat exchanger through the three-way pipe connecting the descending pipe and the horizontal pipe, so as to realize the circulating of the solid particles. The sizes of the down pipes, the three-way pipes and the horizontal pipes and the matching of the process conditions restrict the effect of circulating and distributing the solid particles in the shell-and-tube heat exchanger. The utility model simplifies the process flow of the traditional self-cleaning fluidized bed heat exchanger, improves the stability and cleaning effect of the circulation of particles in the fluidized bed heat exchanger, prolongs the long-period operation of the device, and can solve the problem of the circulation recovery of solid particles in the traditional heat exchanger and pipeline blockage clearing process.
In order to increase the flow rate into the fluidized bed heat exchanger and to increase the uniform distribution of solid particles in the tube array for improved cleaning, according to a preferred embodiment of the present utility model, the conveying unit comprises an auxiliary branch 9 communicating with the feed inlet of the fluidized bed heat exchanger 1, and a branch pump 8 is mounted on the auxiliary branch 9 for supplementing the fluidized bed heat exchanger 1 with liquid and increasing the kinetic energy of the liquid-solid mixture from the particle conveying tube, so as to enhance the stable circulation and uniform distribution of particles in the self-cleaning fluidized bed heat exchanger, and the liquid supplemented by the auxiliary branch 9 may flow the same as or different from the circulating liquid, but the liquid component supplemented by the auxiliary branch 9 does not exceed the circulating liquid.
According to a preferred embodiment of the utility model, the non-destructive particulate delivery pump 2 tesla pump, for example of model TSL80-50-200GR, is vaneless turbine and is not corroded by circulating liquid, so that the tesla pump in combination with the auxiliary branch 9 to which the bypass pump 8 is mounted, has a high flow (flow rate of liquid-solid mixture in the horizontal main line is not less than 2.0m/s, corresponding to a pipe diameter of the horizontal main line of 100mm, flow rate of mixture is not less than 60 m) while satisfying a high lift (for example not less than 40 m) compared with the prior art 3 And/h) the uniform distribution and the circulation stability of the solid particles are further enhanced while the particle integrity is ensured so as to improve the cleaning effect; of course the utility model is not limited toIn the tesla pump, a liquid-solid transfer pump which can transfer large particles (e.g., particle size of not less than 1 mm) of hard (e.g., mohs hardness of not less than 6) for a long period of time can be used in the present utility model.
According to a preferred embodiment of the utility model, the lower tube box 7 of the fluidized bed heat exchanger 1 is provided with a mixing structure 20 formed as a feed inlet, the mixing structure and the lower tube box 7 are connected in a sealing manner, the mixing structure 20 comprises a shell and a closed cavity formed by surrounding the shell, as shown in fig. 2, the closed cavity is communicated with an auxiliary branch tube 9, the top wall of the closed cavity is provided with an orifice plate 21 with a plurality of distribution holes, a particle conveying tube 10 axially extends into the closed cavity and penetrates through the orifice plate 21, and the outlet of the particle conveying tube 10 extends out of the orifice plate or is flush with the orifice plate;
wherein the supplementary liquid in the auxiliary branch pipe 9 is pumped into the closed cavity and sprayed out from the distribution holes to be mixed with the cleaned solid particles and the circulating liquid sprayed out from the particle conveying pipe 10 and then enter the tube side of the fluidized bed heat exchanger.
In some embodiments of the present utility model, the longitudinal section of the closed cavity formed by the mixing structure is formed into a T shape, and is respectively communicated with the cylindrical upper closed cavity and the cylindrical lower closed cavity, the upper closed cavity is located inside the lower pipe box 7, the lower closed cavity extends out of the lower pipe box, the particle conveying pipe and the lower closed cavity are concentrically and coaxially arranged and extend to an orifice plate located on the top wall of the upper closed cavity, and the auxiliary branch pipe is communicated with the side surface of the lower closed cavity.
According to a preferred embodiment of the present utility model, the porosity S of the orifice plate 21 is 0.2 to 1.
For uniform distribution, according to a preferred embodiment of the utility model, the plurality of distribution holes are arranged symmetrically with respect to the center of the outlet of the particle transport tube.
In order to reasonably distribute the plurality of distribution holes on the orifice plate and to ensure uniformity of distribution, according to a preferred embodiment of the present utility model, the plurality of distribution holes are arranged in a circle, a diamond, a regular hexagon or a regular octagon.
In order to avoid the backflow of particles into the mixing structure, according to a preferred embodiment of the utility model, the distribution holes are provided with a sieve, the ratio R of the pore size of the sieve to the particle size of the solid particles 2 0 to 1.
According to a preferred embodiment of the utility model, the ratio R of the outer diameter of the auxiliary branch 9 to the pipe diameter of the lower pipe box 7 of the fluidized bed heat exchanger 1 1 0.4 to 1.
According to a preferred embodiment of the utility model, the outlet height R of the particle transport tube 10 3 The lower pipe box 7 of the fluidized bed heat exchanger 1 is positioned at 0 to 1/6 of the position from bottom to top.
According to a preferred embodiment of the present utility model, the cleaning unit comprises:
the liquid-solid separator 4 is communicated with a discharge port of the fluidized bed heat exchanger 1 and is used for separating solid particles and liquid in the liquid-solid mixture to be treated;
the cleaning device 5 can be a cleaning tank formed by surrounding a shell, and the cleaning tank is communicated with a particle discharge port of the liquid-solid separator 4 and a cleaning liquid feeding pipeline 13 and is used for cleaning solid particles from the liquid-solid separator by using a cleaning liquid, wherein the cleaning liquid can be one of reaction intermediate products or final products, and the cleaning tank is also provided with a cleaning residual liquid discharge port used for discharging the cleaned cleaning residual liquid and a solid particle discharge port used for recycling the solid particles; thus, solid particles can be collected at the particle discharge outlet, and the recovery rate can be calculated by adopting a weighing method in the prior art; particle recovery = mass of collected particles/amount of solid particles added 100%.
According to a preferred embodiment of the utility model, the circulation cleaning system comprises a liquid reservoir 6 in communication with the liquid outlet of the liquid-solid separator 4 for storing the separated liquid for re-mixing with the solid particles as circulation liquid for hydrodynamic transport.
According to a preferred embodiment of the present utility model, the mixing unit comprises a liquid-solid mixing device 3, the liquid-solid mixing device 3 may be a mixing tank formed by surrounding a housing, the mixing tank is provided with a circulating liquid inlet and a solid particle feeding port 12 for feeding solid particles from the outside, and is communicated with a cleaning tank and a particle conveying pipe 10, and a stirring device in the prior art is arranged in the mixing tank; or other forced mixing devices of the prior art, such as liquid forced internal circulation mixing or liquid forced external circulation mixing devices, to which the present utility model is not particularly limited, and are not described in detail herein.
In order to allow uniform entry of solid particles into each tube array, according to a preferred embodiment of the present utility model, a distributor 11 is provided in the lower tube box 7 of the fluidized bed heat exchanger 1, the distributor being selected from one of a flat plate type, a canopy head type, a rotating vane type or a swirling type.
According to a preferred embodiment of the utility model, the circulation inlet communicates with the circulation feed line and/or the reservoir 6; thus, the circulating liquid in the liquid storage tank 6 can be reused, and resources are reasonably utilized; circulating liquid can also be fed from outside as an alternative.
According to a preferred embodiment of the utility model, the installation height R of the distributor 11 4 The lower pipe box 11 of the fluidized bed heat exchanger 1 is positioned from bottom to top at a position of 1/3 to 2/3.
One embodiment of the utility model is: under the power supplement action of the auxiliary branch pipe 9, the liquid-solid mixture in the particle conveying pipe 10 is pumped out by the nondestructive particle conveying pump 2, and the liquid pumped out by the branch pump 8 enters the heat exchanger tube bundle through the lower tube box 7 to scrape and clean the tube wall; the cleaned liquid-solid mixture flows out from the upper tube box through the tube bundle of the heat exchanger and enters the liquid-solid separator 4; the separated solid particles enter a cleaning tank, one part of liquid enters a liquid storage tank, and the other part of liquid enters the cleaning tank; under the cleaning action of the cleaning liquid, solid particles finish cleaning in the cleaning tank and enter a liquid-solid mixing tank to be mixed with circulating liquid, and enter the fluidized bed heat exchanger again through a particle conveying pipe; and after running for a period of time, collecting the solid particles from the solid particle outlet of the cleaning tank by adopting a heavy method, and finishing metering.
According to the utility model, the stable continuous circulation distribution of particles is realized by hydraulically conveying unbroken solid particles through the hydraulic conveying pump; the continuous recycling of particles in the self-cleaning fluidized bed heat exchanger is realized through the supplementary flow of the auxiliary branch, so that the problems of uneven distribution of particles in the heat exchanger and low circulating stability of the particles in the fluidized bed heat exchanger in the prior art are well solved, and the method can be applied to the industrialization of the self-cleaning fluidized bed heat exchanger.
The present utility model is illustrated by the following examples, but the present utility model is not limited thereto.
Example 1
A circulating cleaning system adopting the fluidized bed heat exchanger shown in fig. 1; the fluidized bed heat exchanger 1 is internally provided with 40 heat exchange tubes, each tube is 1000mm long, the tube diameter is phi 22 multiplied by 1.5mm, and the tubes are arranged in a square shape. The particle delivery pipe 10 of a Tesla pump of model TSL80-50-200GR is installed with a diameter of 50mm and the lower pipe box 7 with a diameter of 400mm. The solid particles were 10000g of zirconia with a diameter of about 3 mm; the circulating liquid is water; the flow rate of the particle conveying pipe is 4m 3 /h。
Ratio R of outer diameter of auxiliary branch pipe 9 and pipe diameter of lower pipe box 7 1 The pore plate 21 is provided with circular distribution holes which are distributed on the center symmetrically, the equivalent diameter of the surface of the distribution Kong Dengbi is 25mm, and the porosity S of the pore plate 21 is 0.5. The pore diameter of the filter screen and the particle diameter ratio R of the particles 2 At 0.5, the height of the outlet of the particle transport tube 10 from the orifice plate 21 was 5mm, the particle transport tube outlet height R 3 The distributor 11 is a planar plate type distributor and is positioned at the position 1/12 of the lower pipe box from bottom to top, and the installation height R 4 At the 1/3 position of the down tube box 7 from bottom to top. The flow rate of water in the branch pipe is 8m 3 And/h. Under this condition, after stable operation for 8 hours, the solid particles collected at the solid particle discharge port were measured to be 9303g in mass M and 93.03% in particle recovery rate.
Examples 2 to 12
Unlike example 1, R was changed 1 、R 2 、R 3 、R 4 S. After 8h of stable operation, the mass (M) of solid particles collected at the outlet of the metering valve was measured and the results are shown in Table 1.
TABLE 1
| Examples | R 1 | R 2 | S | R 3 | R 4 | Recovery rate |
| 1 | 0.5 | 0.5 | 0.5 | 1/12 | 1/3 | 93.03％ |
| 2 | 0.7 | 0.5 | 0.5 | 1/12 | 1/3 | 92.73％ |
| 3 | 0.5 | 0.7 | 0.5 | 1/12 | 1/3 | 93.32％ |
| 4 | 0.5 | 0.5 | 0.3 | 1/12 | 1/3 | 93.77％ |
| 5 | 0.5 | 0.5 | 0.5 | 1/8 | 1/3 | 94.33％ |
| 6 | 0.5 | 0.5 | 0.5 | 1/12 | 2/5 | 91.96％ |
Examples 13 to 14
Unlike example 1, the arrangement of a plurality of distribution holes was changed, and the results thereof are shown in Table 2.
TABLE 2
| Examples | Arrangement of a plurality of distribution | Recovery rate | |
| 1 | Round shape | 93.03％ | |
| 13 | Regular hexagon | 91.12％ | |
| 14 | Regular octagon | 92.35％ |
Comparative example 1
Unlike example 1, the rotor pump of the prior art was used instead of the tesla pump, the rotor pump impeller was significantly damaged, the solid particles were severely damaged, and the mass of the solid particles collected at the solid particle discharge port was less than 50%.
The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited thereto. Within the scope of the technical idea of the utility model, a plurality of simple variants of the technical proposal of the utility model can be carried out, comprising that each specific technical feature is combined in any suitable way, and in order to avoid unnecessary repetition, the utility model does not need to be additionally described for various possible combinations. Such simple variations and combinations are likewise to be regarded as being within the scope of the present disclosure.
Claims (10)
1. A circulating cleaning system for a fluidized bed heat exchanger, the circulating cleaning system comprising:
the fluidized bed heat exchanger (1) is provided with a feed inlet and a discharge outlet, wherein the feed inlet is used for feeding a liquid-solid mixture which is used as a cleaning object and contains solid particles and cleaning circulating liquid, and the discharge outlet is used for discharging the cleaned liquid-solid mixture to be treated;
the cleaning unit is communicated with the discharge port and is used for cleaning solid particles in the liquid-solid mixture to be treated to obtain cleaned solids;
a mixing unit which is communicated with the cleaning unit and is provided with a circulating liquid inlet for feeding a cleaning circulating liquid, and is used for mixing the cleaning circulating liquid, new solid particles and/or the cleaned solid from the cleaning unit;
the conveying unit comprises a particle conveying pipe (10) provided with a nondestructive particle conveying pump (2), one end of the particle conveying pipe (10) is communicated with the mixing unit, and the other end of the particle conveying pipe is communicated with a feed inlet of the fluidized bed heat exchanger (1) and is used for conveying materials of the mixing unit into the fluidized bed heat exchanger (1).
2. The circulation cleaning system according to claim 1, characterized in that the conveying unit comprises an auxiliary branch (9) communicating with the feed inlet of the fluidized bed heat exchanger (1), the auxiliary branch (9) being provided with a branch pump (8) for replenishing liquid to increase the flow into the fluidized bed heat exchanger (1).
3. The circulation cleaning system according to claim 2, characterized in that the lossless particle transfer pump (2) is a tesla pump;
and/or
The lower pipe box (7) of the fluidized bed heat exchanger (1) is provided with a mixing structure (20) formed into a feed inlet, the mixing structure (20) comprises a shell and a closed cavity formed by surrounding the shell, the closed cavity is communicated with the auxiliary branch pipe (9), the top wall of the closed cavity is provided with an orifice plate (21) with a plurality of distribution holes, and the particle conveying pipe (10) axially extends into the closed cavity and penetrates through the orifice plate (21);
wherein the replenishing liquid in the auxiliary branch pipe (9) is pumped into the closed cavity and sprayed out of the distribution holes to be mixed with the cleaned solid particles and circulating liquid sprayed out of the particle conveying pipe (10).
4. A recirculating cleaning system according to claim 3, characterized in that the porosity S of the perforated plate (21) is between 0.2 and 1;
and/or
A plurality of said distribution holes are arranged symmetrically with respect to the outlet center of said particle transport tube (10).
5. The circulation cleaning system of claim 3 or 4, wherein a plurality of the distribution holes are arranged in a circle, diamond, regular hexagon, or regular octagon;
and/or
The distribution holes are provided with a filter screen, and the ratio R of the pore diameter of the filter screen to the particle diameter of the solid particles 2 0 to 1.
6. The circulation cleaning system according to claim 5, characterized in that the ratio R of the outer diameter of the auxiliary branch (9) to the pipe diameter of the lower pipe box (7) of the fluidized bed heat exchanger (1) 1 0.4 to 1;
and/or
Outlet height R of particle transport tube (10) 3 The lower pipe box (7) of the fluidized bed heat exchanger (1) is positioned at 0 to 1/6 of the position from bottom to top.
7. The circulation cleaning system of claim 1, wherein the wash unit comprises:
a liquid-solid separator (4) communicated with a discharge port of the fluidized bed heat exchanger (1);
the cleaning device (5) is communicated with a particle discharge port of the liquid-solid separator (4) and a cleaning liquid feeding pipeline (13).
8. The circulation cleaning system according to claim 7, characterized in that it comprises a liquid reservoir (6) communicating with the liquid outlet of the liquid-solid separator (4).
9. The circulation cleaning system according to claim 8, characterized in that the mixing unit comprises a liquid-solid mixing device (3), the liquid-solid mixing device (3) being provided with the circulation liquid inlet and a solid particle feed opening (12) and communicating with a washing device (5) and a particle transfer pipe (10), the liquid-solid mixing device (3) being provided with a stirring apparatus;
and/or
A distributor (11) is arranged in the lower pipe box (7) of the fluidized bed heat exchanger (1), and the distributor is selected from one of a flat plate type, a tarpaulin head type, a rotary vane type or a rotary vane type.
10. The circulation cleaning system according to claim 9, characterized in that the circulation liquid inlet communicates with a circulation liquid feed line and/or a liquid reservoir (6); and/or
Mounting height R of the distributor (11) 4 The lower pipe box (7) of the fluidized bed heat exchanger (1) is arranged at the position of 1/3-2/3 from bottom to top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222852026.1U CN219141625U (en) | 2022-10-27 | 2022-10-27 | Circulation cleaning system of fluidized bed heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222852026.1U CN219141625U (en) | 2022-10-27 | 2022-10-27 | Circulation cleaning system of fluidized bed heat exchanger |
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| Publication Number | Publication Date |
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| CN219141625U true CN219141625U (en) | 2023-06-06 |
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| CN202222852026.1U Active CN219141625U (en) | 2022-10-27 | 2022-10-27 | Circulation cleaning system of fluidized bed heat exchanger |
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| CN (1) | CN219141625U (en) |
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2022
- 2022-10-27 CN CN202222852026.1U patent/CN219141625U/en active Active
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