CN111089286A - Scale prevention and removal circulating fluidized bed heat exchanger and scale prevention and removal circulating method - Google Patents
Scale prevention and removal circulating fluidized bed heat exchanger and scale prevention and removal circulating method Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
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Abstract
The invention relates to a scale prevention and removal circulating fluidized bed heat exchanger and a scale prevention and removal circulating method, which are mainly used for solving the technical problem that solid particles of an external circulating fluidized bed heat exchanger in the traditional technology cannot be fully circulated. The invention adopts a descaling circulating fluidized bed heat exchanger, which comprises: the system comprises a heat exchanger, a liquid-solid separator, a liquid storage tank, a liquid circulating pump, a downcomer, a nozzle, a horizontal pipe and a solid feeding tank; one end of the horizontal pipe is connected with the lower pipe box, the other end of the horizontal pipe is connected with the liquid circulating pump, and a descending pipe communicated with the liquid-solid separator is connected to a horizontal pipe section between the lower pipe box and the liquid circulating pump; the technical scheme that the nozzle is positioned at one side of the connecting end of the liquid circulating pump and the horizontal pipe at the connecting part of the horizontal pipe and the downcomer better solves the technical problem, can be used for an external circulating fluidized bed heat exchanger, and realizes the effective circulation of solid particles in the external circulating fluidized bed heat exchanger.
Description
Technical Field
The invention belongs to the field of chemical industry, particularly belongs to the field of long-period operation of chemical heat exchange equipment, relates to a scale prevention and removal circulating fluidized bed heat exchanger and a scale prevention and removal circulating method, and is widely applied to solving the problem that the long-period operation of a device is influenced because solid particles of a traditional external circulating fluidized bed heat exchanger cannot be sufficiently circulated.
Background
Heat exchangers are widely used in the petroleum, chemical, energy and other industries. However, as the service life of the heat exchanger increases, the heat exchanger inevitably has a dirt adhesion phenomenon, 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 influenced.
The fluidized bed heat exchanger is developed to replace the traditional heat exchanger, so that the heat exchange effect of the heat exchanger can be improved, and the running time of the device is effectively prolonged. Within the range of the liquid phase flow rate of the heat exchanger, whether solid particles can effectively circulate in the fluidized bed 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 circulating fluidized bed heat exchanger, due to pipeline resistance and distribution, solid particles are easily sealed by a liquid column flowing in a horizontal pipe in a descending pipe in the circulating process, so that local short circuit of fluid in the descending pipe pipeline is caused, effective circulation of the solid particles is prevented, and the application of the external circulating 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 has the advantages that solid particles can not be effectively circulated, and the fluidized bed heat exchanger can only be used for a horizontal heat exchanger. Document US6350928 discloses an external circulation type fluidized bed heat exchanger which is not provided with a specific solid particle circulating member and is not capable of maintaining a heat transfer effect or normally operating during an operation period. 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 solid particle circulation.
The invention provides a descaling circulating fluidized bed heat exchanger, which forms a strong suction negative pressure at the junction of a downcomer and a horizontal pipe and simultaneously reduces the pressure drop of a nozzle through a nozzle body system consisting of a reducing section and an equal-diameter section containing an inner member cylinder, realizes the effective circulation of solid particles in a heat exchanger tube nest and specifically solves the problems.
Disclosure of Invention
One of the technical problems to be solved by the invention is the technical problem that solid particles of an external circulating fluidized bed heat exchanger in the traditional technology cannot be fully circulated, and the invention provides a nozzle which is provided with a necking section and a specially designed equal-diameter section and is used for preventing the descaling circulating fluidized bed heat exchanger from having the advantages of full circulation of the solid particles and long-period operation maintenance of the device.
The invention aims to solve the technical problem that solid particles of an external circulating fluidized bed heat exchanger cannot be fully circulated in the traditional technology, and provides a descaling circulating fluidized bed heat exchanger which is provided with a nozzle for solving one of the technical problems and has the advantages of full circulation of the solid particles and long-period operation of the device.
The third technical problem to be solved by the invention is to provide a circulating method of the scale prevention and removal circulating fluidized bed heat exchanger corresponding to the second technical problem.
The fourth technical problem to be solved by the invention is to provide a method for metering solid particles in the anti-scaling circulating fluidized bed heat exchanger, which corresponds to the second technical problem.
In order to solve one of the above technical problems, the technical scheme adopted by the invention is as follows: a nozzle comprising a reducing section and an equal diameter section; wherein, the constant diameter section is connected with a small opening at the tail end of the necking section.
In the above technical solution, the equal diameter section preferably consists of an equal diameter cylinder and a cylinder inner member; the cylinder inner member is preferably a hollow prism having the same length as the equal-diameter cylinder.
In the above technical solution, the cross section of the cylindrical inner member is preferably in a shape of a centrosymmetric structure, and more preferably in any one of a diamond shape, a regular hexagon shape, and a regular octagon shape.
In the above technical solution, preferably, the diameter of the circumcircle of the cylindrical inner member is 0.6 to 1 time of the diameter of the end of the reduced diameter section.
In the above technical solution, preferably, the cylinder inner member is coaxially nested in the equal-diameter cylinder, and the outer wall of the cylinder inner member is hermetically connected with the inner wall of the equal-diameter cylinder.
In the technical scheme, the diameter of a small opening at the tail end of the necking section is preferably 0.2-0.6 times of the diameter of a large opening at the opening end; the length of the constant-diameter section is preferably 0.2-3 times of the diameter of the large opening.
In the above technical solution, the inclination angle between the upper wall surface of the reducing section and the horizontal plane is preferably 5 ° to 45 °.
To solve the second technical problem, the technical solution adopted by the present invention is as follows: a fouling-control-preventing circulating fluidized bed heat exchanger comprising: the system comprises a heat exchanger, a liquid-solid separator 4, a liquid storage tank 6, a liquid circulating pump 7, a downcomer 8, a nozzle 9, a horizontal pipe 10 and a solid charging tank 11; the heat exchanger comprises an upper tube box 3, heat exchanger tubes 2 and a lower tube box 1; a particle filter plate 5 is arranged in the liquid-solid separator 4 to divide the liquid-solid separator 4 into an upper part and a lower part; the upper pipe box 3 is connected with the lower part of the liquid-solid separator 4 through a pipeline, and the upper part of the liquid-solid separator 4 is connected with the liquid storage tank 6 through a pipeline; the horizontal pipe 10 is connected with a feeding tank 11; one end of the horizontal pipe 10 is connected with the lower pipe box 1, the other end of the horizontal pipe is connected with the liquid circulating pump 7, and a descending pipe 8 communicated with the liquid-solid separator 4 is connected to the section of the horizontal pipe 10 between the lower pipe box 1 and the liquid circulating pump 7; the nozzle 9 is positioned at one side of the connection end of the liquid circulating pump 7 in the horizontal pipe 10 at the connection part of the horizontal pipe 10 and the downcomer 8.
In the above technical solution, the nozzle 9 includes a reducing section and an equal diameter section.
In the technical scheme, the reducing section nozzle reduces the diameter along the liquid flow direction; the diameter of the large opening at the beginning is preferably 0.5-1 time of the diameter of the horizontal pipe 10; the diameter of the tail end of the reducing section is preferably 0.2-0.6 times of the diameter of the large opening.
In the above technical solution, the equal diameter section preferably comprises an equal diameter cylinder and a cylinder inner member, the equal diameter cylinder is connected with the small opening at the end of the reducing section, and the cylinder inner member is of a hollow structure.
In the above-described aspect, the cylindrical inner member is preferably a prism having a cylinder with the same length and the same diameter.
In the above technical solution, the cross section of the cylindrical inner member is preferably a centrosymmetric structure; preferably diamond, regular hexagon, regular octagon.
In the technical scheme, the diameter of the circumcircle of the cylindrical inner member is preferably 0.6-1 time of the diameter of the tail end of the reducing section.
In the technical scheme, the cylinder inner member is coaxially nested in the equal-diameter cylinder, and the outer wall of the cylinder inner member is hermetically connected with the inner wall of the equal-diameter cylinder.
In the above technical solution, the inclination angles of the upper wall surface and the horizontal plane of the reducing section of the nozzle 9 are preferably 5 ° to 45 °.
In the above technical scheme, the outlet flow velocity of the reducing section of the nozzle 9 is preferably 2-25 times of the inlet flow velocity of the reducing section.
In the technical scheme, the length of the equal-diameter section of the nozzle 9 is 0.2-3 times of the diameter of the large opening.
In the above technical solution, the leftmost position of the nozzle 9 is preferably located below the nozzle connecting the downcomer 8 and the horizontal pipe 10.
In the above technical solution, the fluidized bed heat exchanger is selected from one of a gravity settling separator and a cyclone separator.
In the technical scheme, the diameter ratio of the aperture of the particle filter plate to the particle is preferably 0.2-0.9.
In the above technical solution, the solid particles used in the fluidized bed heat exchanger are preferably inert particles that do not react with the medium in the application system, and the bulk density of the solid particles is greater than the liquid phase density. Still more preferably one or more of zirconium silicate beads, corundum beads, porcelain beads, alumina beads, zirconium silicate beads, glass beads, steel balls, engineering plastics, polyoxymethylene particles, polytetrafluoroethylene particles, small stones, chopped metal wires, and rubber beads, and more preferably glass beads, alumina beads, and zirconium silicate beads. The average particle size of the particles is 1 mm-5 mm; the average volume solid content of the particles in the fluidized bed heat exchanger is 0.1-6%.
In the technical scheme, the operation range of the flow velocity of the circulating water in the heat exchanger tube array 2 of the fluidized bed heat exchanger is preferably 0.8-4 m/s.
In order to solve the third technical problem, the invention adopts the technical scheme that: a circulation method of a scale control circulating fluidized bed heat exchanger, adopt any one of the above-mentioned two said technical schemes of solving the technical problem to prevent and remove the scale circulating fluidized bed heat exchanger, under the effect of entrainment of the spray nozzle 9, the solid particle in the downcomer 8 and water in the liquid storage tank 6 pumped out by the liquid circulating pump 7 enter the heat exchanger tube nest 2 through the horizontal pipe 10 together; the liquid-solid mixture flows out from the upper pipe box 3 through the heat exchanger tube array 2 and enters the liquid-solid separator 4; separated liquid circulating water overflows from the particle filter plate 5 and then enters the liquid storage tank 6, separated solid particles flow to the horizontal pipe through the downcomer 8, and under the entrainment action of the nozzle 9, the separated solid particles and water pumped by the liquid circulating pump 7 enter the heat exchanger tubes 2 again through the horizontal pipe 10 to complete circulation.
In order to solve the fourth technical problem, the invention adopts the technical scheme that: a method for metering solid particles in a descaling circulating fluidized bed heat exchanger adopts any one of the two technical schemes for solving the technical problems, a main valve 12 and a lower metering valve 14 are closed, an upper metering valve 13 is opened, and the solid particles enter a metering tank 15 to finish metering.
In the above technical scheme, the valve 13 is closed, the valve 12 is opened, the solid particles are metered, the valve 14 is opened after metering is completed, and the solid particles enter the downcomer 5 to continue to complete solid particle circulation in the fluidized bed heat exchanger.
Among the above-mentioned technical scheme, measuring tank 15 is preferred to be made by transparent material, and measuring tank 4 inner wall has the scale according to the volume mark.
In the technical scheme and the method, the solid particle circulating effect is represented by the mass circulating quantity of the solid particles in the metering tank 4 in unit time during stable operation. The mass circulation of the solid particles in the metering tank 4 is calculated in the following way:
the solid particle mass circulation is the solid particle density x total volume of the scale portion of the measuring tank x the scale reading/time of the measuring tank.
By adopting the technical scheme of the invention, the effective circulation of solid particles in the heat exchanger tube array is realized by adopting a nozzle system consisting of the reducing section and the equal-diameter section containing the inner member cylinder, the mass circulation quantity of the solid particles can reach 455 g/min, and a better technical effect is achieved.
Drawings
FIG. 1 is a schematic flow diagram of a fluidized bed heat exchanger according to the present invention.
FIG. 2 is a schematic view of a fluidized bed heat exchanger nozzle according to the present invention.
FIG. 3 is a schematic bottom plan view of the internal components of the fluidized bed heat exchanger nozzle cylinder.
In fig. 1, 1 is a lower pipe box; 2 is a heat exchanger tube; 3 is an upper channel box; 4 is a liquid-solid separator; 5 is a particle filter plate; 6 is a liquid storage tank; 7 is a liquid circulating pump; 8 is a down pipe; 9 is a nozzle; 10 is a horizontal tube. 11 is a feeding tank; 12 is a downcomer flow control valve, 13, 14 are metering valves, and 15 is a metering tank.
Wherein, the upper pipe box 3 is connected with the liquid-solid separator 4, the liquid-solid separator 4 is divided into two paths, one path of the liquid phase is connected with a nozzle 9 positioned at the junction of a descending pipe 8 and a horizontal pipe 10, the other path of the liquid phase is connected with a solid particle groove 6 from the upper part of a particle filter plate 5, the solid particle groove 6 is connected with a liquid circulating pump 7, and the liquid circulating pump 7 is connected with the horizontal pipe 10. The circulating amount of solid particles is metered by controlling the valves 12, 13, 14.
In FIG. 2, 8 is a downcomer; 9 is a nozzle; 10 is a horizontal tube.
In FIG. 3, (a), (b), (c), and (d) are respectively diamond, regular hexagon, orthogonal ellipse, and regular octagon.
The invention is further illustrated by the following examples and comparative examples, without however being limited thereto.
Detailed Description
The process of the present invention is further illustrated below with reference to examples.
[ example 1 ]
The fouling control circulating fluidized bed heat exchanger shown in FIG. 1 was used. 123 heat exchange tubes are arranged in the fluidized bed heat exchanger, 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 pipe diameter of the horizontal pipe is 50mm, and the pipe diameter of the downcomer is 25 mm. The liquid phase is water. The diameter of the large opening is 1 time of that of the horizontal pipe, and the outlet flow speed of the reducing section of the nozzle is 5 times of the inlet flow speed. The length of the constant diameter section of the nozzle is 1 time of the diameter of the large opening.
The solid particles are glass beads with the average particle diameter of 2mm, and the average volume solid content of the solid particles in the fluidized bed heat exchanger is 1.5 percent. The flow rate of the liquid phase was 1.5 m/s. The diameter of the large opening of the nozzle reducing section is 50mm, the diameter ratio of the tail end of the reducing section to the large opening is 0.25, the diameter ratio of the circumscribed circle of the cylindrical inner member to the tail end of the reducing section is 1.0, and the inclination angle of the upper wall surface and the horizontal plane of the nozzle reducing section is 30 degrees. The horizontal distance of the leftmost end of the nozzle directly below the leftmost end of the downcomer is 16 mm. Under these conditions, after stable operation, the mass circulation of the solid particles in the metering tank was found to be 401 g/min.
[ examples 2 to 22 ]
The fouling control circulating fluidized bed heat exchanger shown in FIG. 1 was used. 123 heat exchange tubes are arranged in the fluidized bed heat exchanger, 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 pipe diameter of the horizontal pipe is 50mm, and the pipe diameter of the downcomer is 25 mm. The liquid phase is water. On the basis of example 1, the type of solid particles (P1), the average particle size of the solid particles (P2), the average volume solid content (S) of the solid particles in the fluidized bed heat exchanger, the liquid phase flow rate (V), the ratio of the diameter of the tail end of the reduced diameter section to the diameter of the large port (R1), the ratio of the diameter of the circumscribed circle of the cylindrical inner member to the diameter of the tail end of the reduced diameter section (R2), the inclination angle (a) of the upper wall surface and the horizontal plane of the reduced diameter section of the nozzle, the horizontal distance (L) of the leftmost end of the nozzle just below the leftmost end of the downcomer, the cross-sectional shape (539f) of the cylindrical inner member, and the ratio. After stable operation, the mass circulation (MT) of the solid particles was measured and the results are given in Table 1.
TABLE 1
[ examples 23 to 25 ]
The fouling control circulating fluidized bed heat exchanger shown in FIG. 1 was used. 123 heat exchange tubes are arranged in the fluidized bed heat exchanger, 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 pipe diameter of the horizontal pipe is 50mm, and the pipe diameter of the downcomer is 25 mm. The liquid phase is water. Based on example 1, the ratio of the diameter of the horizontal pipe (R4), the ratio of the outlet flow rate of the reducing section to the inlet flow rate (R5) and the ratio of the length of the constant-diameter section of the nozzle to the diameter of the large opening (R6) are preferably changed. After stable operation, the mass circulation of solid particles (MT) was measured and the results are given in Table 2.
TABLE 2
| Examples | P1 | R4 | R5 | R6 | MT/g.min-1 |
| 23 | Glass bead | 0.8 | 5 | 1 | 398 |
| 24 | Glass bead | 1 | 4 | 1 | 377 |
| 25 | Glass bead | 1 | 5 | 2 | 402 |
[ COMPARATIVE EXAMPLES 1 to 8 ]
The fouling control circulating fluidized bed heat exchanger shown in FIG. 1 was used. 123 heat exchange tubes are arranged in the fluidized bed heat exchanger, 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 pipe diameter of the horizontal pipe is 50mm, and the pipe diameter of the downcomer is 25 mm. The liquid phase is water. Based on example 1, the solid particle type (P1), the cross-sectional shape (F) of the cylindrical inner member, the average particle diameter (P2) of the solid particles, the average volume solid content (S) of the solid particles in the fluidized bed heat exchanger, the liquid phase flow rate (V), the diameter ratio of the end of the reduced diameter section to the large port (R1), the diameter ratio of the end of the circumscribed circle of the cylindrical inner member to the reduced diameter section (R2), the inclination angle (a) of the upper wall surface and the horizontal plane of the reduced diameter section of the nozzle, the horizontal distance (L) of the leftmost end of the nozzle just below the leftmost end of the downcomer, and the diameter ratio of the pore diameter of the filter plate to the particles (R3) were maintained, and after stable operation, the mass circulation amount (MT) of the solid.
TABLE 3
Comparative example 9
The fouling control circulating fluidized bed heat exchanger shown in FIG. 1 was used. 123 heat exchange tubes are arranged in the fluidized bed heat exchanger, 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 pipe diameter of the horizontal pipe is 50mm, and the pipe diameter of the downcomer is 25 mm. The liquid phase is water. On the basis of the embodiment 1, the necking constant diameter section is removed. After stable operation, the mass circulation of the solid particles is 185g.min-1. The circulation effect is not good.
Comparative example 10
The scale control circulating fluidized bed shown in FIG. 1 is adopted for replacingA heat apparatus. 123 heat exchange tubes are arranged in the fluidized bed heat exchanger, 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 pipe diameter of the horizontal pipe is 50mm, and the pipe diameter of the downcomer is 25 mm. The liquid phase is water. On the basis of the embodiment 1, the size parameter of the reducing equal-diameter section is changed. After stable operation, the mass circulation amount of the solid particles is measured to be 195g.min-1. The circulation effect is not good.
Claims (10)
1. A nozzle comprising a reducing section and an equal diameter section; wherein, the constant diameter section is connected with a small opening at the tail end of the necking section.
2. The nozzle of claim 1, wherein said constant diameter section is comprised of an assembly comprising a constant diameter cylinder and a cylinder inner member; wherein, the cylinder inner component is preferably a prism with a hollow structure, and the length of the cylinder inner component is the same as that of the equal-diameter cylinder; further preferably: the cross section of the cylindrical inner member is preferably in a shape of a central symmetry structure, more preferably in any one of a diamond shape, a regular hexagon shape and a regular octagon shape, and the diameter of an outer circle of the cylindrical inner member is preferably 0.6-1 time of the diameter of the tail end of the diameter-reducing section; still more preferably: the cylinder inner member is preferably coaxially nested in the equal-diameter cylinder, and the outer wall of the cylinder inner member is hermetically connected with the inner wall of the equal-diameter cylinder.
3. The nozzle of claim 1, wherein the terminal minor diameter of the neck section is 0.2 to 0.6 times the diameter of the open-end major opening; the length of the constant diameter section is 0.2-3 times of the diameter of the large opening; further preferably: the inclination angle between the upper wall surface of the reducing section and the horizontal plane is preferably 5-45 degrees.
4. A fouling-control-preventing circulating fluidized bed heat exchanger comprising: the system comprises a heat exchanger, a liquid-solid separator (4), a liquid storage tank (6), a liquid circulating pump (7), a downcomer (8), a nozzle (9), a horizontal pipe (10) and a solid feeding tank (11); one end of the horizontal pipe (10) is connected with the lower pipe box (1), the other end of the horizontal pipe is connected with the liquid circulating pump (7), and a descending pipe (8) communicated with the liquid-solid separator (4) is connected to the section of the horizontal pipe (10) between the lower pipe box (1) and the liquid circulating pump (7); the nozzle (9) is positioned at one side of the connecting end of the liquid circulating pump (7) in the horizontal pipe (10) at the connecting part of the horizontal pipe (10) and the downcomer (8); characterized in that the nozzle (9) is a nozzle according to any one of claims 1 to 3.
5. The heat exchanger of the descaling circulating fluidized bed according to the claim 1, characterized in that the nozzle (9) is arranged by necking along the direction of liquid flow, and the diameter of the large opening of the nozzle is preferably 0.5-1 times of the diameter of the horizontal pipe (10); further preferably, the outlet flow velocity of the reducing section of the nozzle (9) is preferably 2-25 times of the inlet flow velocity of the reducing section; it is further preferred that the outlet of the equal diameter section of the nozzle (9) is preferably located below the nozzle of the downcomer (8) connected with the horizontal pipe (10).
6. The descaling circulating fluidized bed heat exchanger according to claim 1, wherein the heat exchanger comprises an upper tube box (3), heat exchanger tubes (2) and a lower tube box (1); a particle filter plate (5) is arranged in the liquid-solid separator (4) to divide the liquid-solid separator (4) into an upper part and a lower part; the upper pipe box (3) is connected with the lower part of the liquid-solid separator (4) through a pipeline, and the upper part of the liquid-solid separator (4) is connected with the liquid storage tank (6) through a pipeline; the horizontal pipe (10) is connected with a solid feeding tank (11); further preferably, the liquid-solid separator (4) is preferably selected from one of a gravity settling separator or a cyclone separator; the ratio of the aperture of the particle filter plate to the particle diameter is preferably 0.2-0.9; the solid particles used by the fluidized bed heat exchanger are preferably inert particles, the bulk density of the solid particles is preferably greater than the liquid phase density, and the average particle size of the particles is preferably 1-5 mm; the average volume solid content of the particles in the fluidized bed heat exchanger is preferably 0.1-6%.
7. The descaling circulating fluidized bed heat exchanger according to claim 1, wherein the downcomer (8) has a main valve (12), an upper metering valve (13), a lower metering valve (14), and a metering tank (15); the upper metering valve (13) and the lower metering valve (14) are arranged on branch pipelines which are connected with the downcomer (8) up and down, a metering tank (15) is connected between the upper pipeline and the lower pipeline, and the main valve (12) is arranged on the downcomer (8) between the upper branch pipeline and the lower branch pipeline connection point.
8. A circulation method of a scale prevention and control circulating fluidized bed heat exchanger adopts the scale prevention and control circulating fluidized bed heat exchanger as claimed in any one of claims 1 to 7, and under the entrainment force of a nozzle (9), solid particles in a downcomer (8) and water in a liquid storage tank (6) pumped by a liquid circulating pump (7) enter a heat exchanger tube nest (2) through a horizontal pipe (10); the liquid-solid mixture flows out from the upper pipe box (3) through the heat exchanger tube nest (2) and enters the liquid-solid separator (4); separated liquid circulating water overflows from the particle filter plate (5) and then enters the liquid storage tank (6), separated solid particles flow to the horizontal pipe through the descending pipe (8), and under the action of entrainment of the nozzle (9), the separated liquid circulating water and water pumped by the liquid circulating pump (7) enter the heat exchanger tube array (2) again through the horizontal pipe (10) to complete circulation.
9. The circulating method of a fouling-control circulating fluidized bed heat exchanger according to claim 17, wherein the operating range of the flow rate of circulating water in the heat exchanger tubes (2) of the fluidized bed heat exchanger is 0.8m/s to 4 m/s; more preferably, the outlet flow velocity of the reducing section of the nozzle (9) is 2-25 times of the inlet flow velocity of the reducing section.
10. A method for metering solid particles in a scale prevention and control circulating fluidized bed heat exchanger adopts the scale prevention and control circulating fluidized bed heat exchanger as claimed in any one of claims 1 to 7, a main valve (12) and a lower metering valve (14) are closed, an upper metering valve (13) is opened, and the solid particles enter a metering tank (15) to finish metering.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112990588A (en) * | 2021-03-25 | 2021-06-18 | 青海省环境地质勘查局 | Geothermal pipeline scale removal period prediction method based on reducing rate and pump pressurization amplitude |
| CN116123898A (en) * | 2023-03-01 | 2023-05-16 | 平顶山泰克斯特高级润滑油有限公司 | Fluidized bed heat exchanger for lubricating oil dewaxing process |
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| CN107764109A (en) * | 2016-08-23 | 2018-03-06 | 中国石油化工股份有限公司 | Automatically cleaning fluid-bed heat exchanger |
| CN107764110A (en) * | 2016-08-23 | 2018-03-06 | 中国石油化工股份有限公司 | The outer circulation type fluid-bed heat exchanger that solid particle fully circulates |
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