Easily assembled and disassembled heat transfer tube spray head assembly of rotational flow fluidized bed

Abstract

The invention discloses a heat transfer tube nozzle assembly easy to disassemble and assemble of a rotational flow fluidized bed. The heat transfer tube nozzle assembly comprises a heat transfer tube, and a nozzle assembly is arranged in the heat transfer tube; the heat transfer pipe is formed by repeating a unit formed by sequentially connecting a small-diameter pipe section, a reducer, a large-diameter pipe section and an annular sealing plate for 2-5 times and then connecting an outlet pipe section; the nozzle assembly is formed by repeating a second unit formed by sequentially connecting a rotational flow nozzle, a circular truncated cone, a large-large-diameter rod, a large-to-small transition rod, a small-diameter rod, a small-to-large transition rod and a short large-diameter rod for 2-5 times and then connecting a length alignment rod; the upper part of the heat transfer pipe is connected with the upper part of the nozzle assembly through screws and nuts; perforated plates are arranged at the tops of the heat transfer pipes; a space formed between the heat transfer pipe and the spray head assembly is filled with bed material particles; the bottom end of the small-diameter rod is lower than the bottom end of the reducer; and the bottom of the swirl nozzle is flush with the bottom of the small-diameter pipe section. The heat transfer pipe spray head assembly is convenient to disassemble and assemble, higher in bed material particle scraping effect and not prone to being blocked.

Description

Technical Field

[0001] The invention belongs to the technical field of fluidized beds, and in particular relates to an easily detachable heat transfer pipe nozzle assembly of a cyclonic fluidized bed. Background Art

[0002] Fluidized bed uses the scraping disturbance of bed material particles on the heat exchange wall to prevent scaling of the heat exchange wall, and has potential application value in freezing ice making, cooling crystallization, evaporation crystallization and heat exchange of fluids prone to scaling. The cyclone fluidized bed can make the particles move close to the heat exchange wall, improve the scraping effect of the particles, thereby reducing the number of particles added, reducing the resistance of the fluidized bed, and reducing operating costs.

[0003] However, the swirl effect of the swirl nozzle will be attenuated, and a swirl nozzle needs to be installed at a certain interval. Generally, fluidized bed heat exchangers are composed of a large number of tube bundles, so the installation workload of the swirl nozzle is large. Therefore, it is urgent to develop an easily disassembled heat transfer tube nozzle assembly for a swirl fluidized bed. Summary of the invention

[0004] The object of the present invention is to overcome the deficiencies in the prior art and to provide an easily disassembled heat transfer pipe nozzle assembly for a cyclone fluidized bed.

[0005] The technical solution of the present invention is summarized as follows:

[0006] A detachable heat transfer pipe nozzle assembly for a cyclone fluidized bed comprises a heat transfer pipe 1, wherein a nozzle assembly 2 is arranged inside the heat transfer pipe 1; the heat transfer pipe 1 is formed by sequentially connecting a small diameter pipe section 7, a large and small head 8, a large diameter pipe section 9, and an annular sealing plate 10 to form a unit, wherein the unit is repeated n times, wherein n is 2-5, and then connected to an outlet pipe section 11; the nozzle assembly 2 is sequentially composed of a cyclone nozzle 12, a truncated cone 19, a long and large diameter rod 13, a large-to-small transition rod 14, a small diameter rod 15, a small-to-large transition rod 16, a short The large diameter rods 17 are connected in sequence to form a second unit, the second unit is repeated n times, n is 2-5, and then connected to form a length alignment rod 18; the upper part of the heat transfer tube 1 is connected to the upper part of the nozzle assembly 2 by screws 3 and nuts 5; a porous plate 4 is arranged on the top of the heat transfer tube 1; the space formed between the heat transfer tube 1 and the nozzle assembly 2 is filled with bed particles 6; the bottom end of the small diameter rod 15 is lower than the bottom end of the reducer 8; the bottom of the swirl nozzle 12 is flush with the bottom of the small diameter pipe section 7.

[0007] The apertures of the small holes on the porous plate 4 and the size of the spiral channels 20 on the swirl nozzle 12 are smaller than the particle size of the bed material particles 6 .

[0008] The porous plate 4 is threadedly connected to the top of the heat transfer tube 1 .

[0009] Advantages of the present invention:

[0010] (1) The present invention provides an easily disassembled heat transfer tube nozzle assembly for a cyclone fluidized bed. A plurality of cyclone nozzles are connected in series by combining rods of different diameters. Multiple cyclone nozzles can be installed on one heat transfer tube at one time. The tube is fixed only at the top with bolts and nuts, which makes disassembly and assembly easy.

[0011] (2) In the easily detachable heat transfer tube nozzle assembly of the cyclone fluidized bed of the present invention, since the center of the heat transfer tube is occupied by the rod, more bed material particles run near the wall of the heat transfer tube, and the scraping effect is stronger.

[0012] (3) The easily disassembled heat transfer tube nozzle assembly of the cyclone fluidized bed of the present invention has a small rod diameter at the large and small ends of the heat transfer tube, which is not easy to be blocked by particles.

[0013] (4) The easily disassembled heat transfer tube nozzle assembly of the swirl fluidized bed of the present invention has a truncated cone disposed on the swirl nozzle, which can make the bed material particles close to the nozzle of the swirl nozzle, thereby preventing the bed material particles from being deposited in the dead zone of the flow.

[0014] (5) The swirl nozzles are arranged at intervals to overcome the problem of attenuation of the swirl effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a schematic diagram of an easily disassembled heat transfer tube nozzle assembly of a cyclonic fluidized bed.

[0016] Figure 2 Schematic diagram of heat transfer tube.

[0017] Figure 3 Schematic diagram of the nozzle assembly.

[0018] Figure 4 Schematic diagram of swirl nozzle. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] An easily disassembled heat transfer pipe nozzle assembly for a cyclone fluidized bed (see Figure 1 ), including a heat transfer tube 1, wherein a nozzle assembly 2 is arranged inside the heat transfer tube 1; the heat transfer tube 1 (see Figure 2 ) is a unit formed by connecting a small diameter pipe section 7, a reducer 8, a large diameter pipe section 9, and an annular sealing plate 10 in sequence, the unit is repeated n times, n is 2-5, and then connected to the outlet pipe section 11; the nozzle assembly 2 (see Figure 3 ) are sequentially passed through the swirl nozzle 12 (see Figure 4), a second unit is formed by connecting a truncated cone 19, a long diameter rod 13, a large-to-small transition rod 14, a small diameter rod 15, a small-to-large transition rod 16, and a short large diameter rod 17 in sequence, the second unit is repeated n times, wherein n is 2-5, and then connected with a length alignment rod 18; the upper part of the heat transfer tube 1 is connected to the upper part of the nozzle assembly 2 by screws 3 and nuts 5; a porous plate 4 is arranged on the top of the heat transfer tube 1; bed particles 6 are filled in the space formed between the heat transfer tube 1 and the nozzle assembly 2; the bottom end of the small diameter rod 15 is lower than the bottom end of the large and small heads 8; the bottom of the swirl nozzle 12 is flush with the bottom of the small diameter pipe section 7.

[0021] The number of times the unit is repeated is the same as the number of times the second unit is repeated, preferably 3 times, and can also be repeated 2 times, 4 times or 5 times, so that the heat transfer tube 1 and the nozzle assembly 2 are of equal length.

[0022] The apertures of the small holes on the porous plate 4 and the size of the spiral channels 20 on the swirl nozzle 12 are smaller than the particle size of the bed material particles 6 .

[0023] The porous plate 4 is threadedly connected to the top of the heat transfer tube 1 .

[0024] Working principle of the present invention:

[0025] The fluid enters from the bottom of the heat transfer tube, and generates a spiral upward flow under the guidance of the spiral hole of the swirl nozzle. The spiral upward fluid impacts the bed material particles inside the heat transfer tube, fluidizes the bed material particles within the appropriate flow rate range, and evenly distributes them from bottom to top inside the small diameter section of the heat transfer tube. For the bed material particles that occasionally flow out of the small diameter section of the heat transfer tube, the bed material particles will return to the small diameter section of the heat transfer tube under the action of gravity because the fluid flow rate is reduced in the large diameter section. Since the aperture of the small holes on the porous plate and the size of the flow channel of the swirl nozzle are smaller than the particle size of the bed material particles, the bed material particles are restricted to move inside their own small diameter section of the heat transfer tube. At the same time, due to the centrifugal effect of the rotating flow and the center occupation effect of the series rod, the bed material particles move closely against the heat transfer wall, which improves the scraping effect of the bed material particles. By connecting multiple nozzles in series with a rod, multiple swirl nozzles can be installed on one heat transfer tube at one time, and they are only fixed at the top by bolts and nuts, which is convenient for disassembly and assembly. The diameter of the rod at the large and small ends of the heat transfer tube is small, so the bed material particles are not easy to be blocked. The truncated table is set on the swirl nozzle to make the particles close to the nozzle and prevent the bed material particles from depositing in the dead zone of the flow.

[0026] The specific steps are:

[0027] Take the fluidized bed heat exchanger as an example. During the installation process, the heat transfer tube is first placed horizontally, and then an equal amount of bed material particles are placed in the large diameter section of the heat transfer tube. The stacking height of the bed material particles in the large diameter section of the heat transfer tube should be lower than the lower part of the small diameter section. Then insert the nozzle assembly connected in series into the heat transfer tube, fix the heat transfer tube and the nozzle assembly with bolts and nuts at the upper end of the heat transfer tube, and then seal the top end of the heat transfer tube with a porous plate. If the fluidized bed heat exchanger consists of multiple heat transfer tubes, repeat the above steps to install the nozzle assembly and the porous plate on all heat transfer tubes. Then, after installing the upper and lower heads of the fluidized bed heat exchanger, the fluidized bed heat exchanger can be placed vertically. If maintenance is required after a period of operation, or the bed material particles need to be replaced, the upper and lower heads of the fluidized bed heat exchanger can be directly disassembled in the vertical direction, and the porous plate and fixing bolts and nuts of each heat transfer tube can be removed one by one. Under the action of gravity, the bed material particles and the nozzle assembly will exit the heat transfer tube from the bottom of the fluidized bed heat exchanger. If the height space is limited, the fluidized bed heat exchanger can also be placed horizontally. After all the nozzle components are pulled out, it can be placed vertically to pour out the bed material particles.

[0028] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An easily detachable heat transfer tube nozzle assembly for a cyclonic fluidized bed, comprising a heat transfer tube (1), characterized in that The heat transfer tube (1) is provided with a nozzle assembly (2) inside; the heat transfer tube (1) is composed of a small diameter tube section (7), a large and small head (8), a large diameter tube section (9), and an annular sealing plate (10) connected in sequence to form a unit, the unit is repeated n times, wherein n is 2-5, and then connected to form an outlet tube section (11); the nozzle assembly (2) is composed of a swirl nozzle (12), a truncated cone (19), a long and large diameter rod (13), a large-to-small transition rod (14), a small diameter rod (15), a small-to-large transition rod (16), and a short large diameter rod (17) connected in sequence The second unit is formed, the second unit is repeated n times, wherein n is 2-5, and then connected with a length alignment rod (18); the upper part of the heat transfer tube (1) is connected to the upper part of the nozzle assembly (2) by means of screws (3) and nuts (5); a porous plate (4) is arranged on the top of the heat transfer tube (1); bed material particles (6) are filled in the space formed between the heat transfer tube (1) and the nozzle assembly (2); the bottom end of the small diameter rod (15) is lower than the bottom end of the reducer (8); the bottom of the swirl nozzle (12) is flush with the bottom of the small diameter pipe section (7).

2. According to claim 1, the easily detachable heat transfer pipe nozzle assembly of the cyclone fluidized bed is characterized in that The diameter of the small holes on the porous plate (4) and the size of the spiral channel (20) on the swirl nozzle (12) are smaller than the particle size of the bed material particles (6).

3. The easily detachable heat transfer pipe nozzle assembly of a cyclone fluidized bed according to claim 1, characterized in that The porous plate (4) is threadedly connected to the top of the heat transfer tube (1).

Images