Fluidized bed heat exchanger

Abstract

The utility model discloses a fluidized bed heat exchanger, fixed in fluidized bed, include: heat exchanger line pipe, contain the interval arrangement of many curved pipes, the curved pipe upper end opening is steam import, and the lower end opening is steam and condensed water export, wallboard is equipped with hole, heat exchanger line pipe passes through hole, and heat exchanger line pipe is supported up, the hole of wallboard and heat exchanger line pipe interval is equipped with sleeve pipe, the sleeve pipe outer diameter is fixed with the hole of wallboard, and the sleeve pipe inner diameter and heat exchanger line pipe outer diameter gap cooperation, when not steam, the sleeve pipe inner diameter and heat exchanger line pipe between slidably, when steam, under the action of thermal expansion and cold shrink, the sleeve pipe inner diameter and heat exchanger line pipe outer diameter interference fit. The utility model discloses heat exchanger line pipe is inserted into sleeve pipe, and sleeve pipe and heat exchanger line pipe are not welded, and utilize thermal expansion and cold shrink and keep seamless, reduce the problem that heat exchanger line pipe is easy to leak due to the change of material property caused by shaking and welding.

Description

Technical Field

[0001] This utility model belongs to the field of ammonium chloride production, and in particular relates to a fluidized bed heat exchanger. Background Technology

[0002] The fluidized bed production of ammonium chloride causes the heat exchanger coils to sway with the fluidized material, which can easily lead to cracks at the weld between the heat exchanger coil roots and the wall panel, resulting in steam leakage and bed stagnation. In addition, each maintenance requires the material in the bed to be cleaned and the ventilation and replacement to be qualified before maintenance can be carried out. The maintenance time is long, and the working environment is poor in the fluidized bed, so the maintenance quality cannot be guaranteed.

[0003] In existing fluidized bed heat exchangers, the tubes are directly welded to the wall panels, which often leads to cracking and steam leakage at the welds when the device shakes.

[0004] In addition, the long repair time after the heat exchanger tubes rupture can lead to a poor working environment.

[0005] Therefore, there is an urgent need for a new fluidized bed heat exchanger, its fixing method, and its maintenance method. Utility Model Content

[0006] Technical objective: The purpose of this utility model is to provide a fluidized bed heat exchanger in which the sleeve and the heat exchanger tubes are not welded and can slide relative to each other, and the seamlessness is maintained by thermal expansion and contraction, thereby reducing the risk of leakage in the heat exchanger tubes due to shaking and changes in the properties of welding materials.

[0007] To achieve the above technical objectives, the present invention adopts the following technical solution:

[0008] A fluidized bed heat exchanger, fixed inside a fluidized bed, includes:

[0009] A fluidized bed heat exchanger, fixed inside a fluidized bed, includes:

[0010] The heat exchanger tubes include multiple spaced-apart curved tubes, the upper end of which is an opening for steam inlet and the lower end of which is an opening for steam and condensate outlet.

[0011] The wall panel has holes through which the heat exchanger tubes pass to support the heat exchanger tubes.

[0012] A sleeve is provided between the hole in the wall panel and the heat exchanger tubes. The outer diameter of the sleeve is fixed to the hole in the wall panel, and the inner diameter of the sleeve is clearance-fitted with the outer diameter of the heat exchanger tubes.

[0013] When steam is not supplied, the inner diameter of the sleeve can slide between the heat exchanger tubes. When steam is supplied, the inner diameter of the sleeve and the outer diameter of the heat exchanger tubes are interference-fitted due to thermal expansion and contraction.

[0014] Furthermore, the sleeve is welded and fixed to the wall panel.

[0015] Furthermore, the materials of the sleeve and the heat exchanger tubes are both 316L stainless steel.

[0016] Furthermore, one side of the heat exchanger is bolted to the fluidized bed.

[0017] Furthermore, wall panel support wheels are installed on the lower part of the wall panel, resting on the fluidized bed bottom plate.

[0018] Furthermore, a mobile maintenance vehicle is provided at the outlet of the fluidized bed, and the height of the mobile maintenance vehicle's floor plate is the same as the height of the fluidized bed floor plate.

[0019] A method for fixing a fluidized bed heat exchanger includes the following steps:

[0020] S1. The heated sleeve expands and is then placed on the heat exchanger tubes for cooling, thus fixing the sleeve to the heat exchanger tubes.

[0021] S2. Insert the heat exchanger tubes into the holes in the wall plate and weld the sleeve to the wall plate for fixation.

[0022] S3. During production, steam is introduced into the heat exchanger tubes, and the shell is heated by heat transfer from the heat exchanger tubes. The temperature of the heat exchanger tubes is slightly higher than that of the shell, and the thermal expansion volume of the heat exchanger tubes increases slightly more than that of the shell, so that the gap between the heat exchanger tubes and the hole in the wall plate remains seamless.

[0023] A method for overhauling a fluidized bed heat exchanger includes the following steps:

[0024] S1. Stop fluidized bed production and dismantle its input steam and recovered steam and condensate pipelines;

[0025] S2. Place the mobile maintenance cart at the fluidized bed outlet and secure it.

[0026] S3. Remove the connecting bolts between the heat exchanger and the fluidized bed;

[0027] S4. Pull the heat exchanger onto the mobile maintenance vehicle for repair or complete replacement.

[0028] S5. After maintenance is completed, push the heat exchanger on the mobile maintenance vehicle into the fluidized bed.

[0029] S6. Install the connecting bolts between the heat exchanger and the fluidized bed, and resume production.

[0030] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0031] First, this utility model modifies the wall panel by welding a section of sleeve, with the heat exchanger tubes inserted into the sleeve. The sleeve and the heat exchanger tubes are not welded together and can slide relative to each other. Thermal expansion and contraction are used to maintain a seamless connection, reducing the problem of easy cracking and leakage of the heat exchanger tubes due to shaking of the heat exchanger tubes and changes in the properties of the welding materials.

[0032] Secondly, the heat exchanger of this utility model is bolted to the fluidized bed and is equipped with casters, so it can be moved to a mobile maintenance vehicle outside the fluidized bed. The maintenance method changes the heat exchanger from being maintained inside the furnace to being maintained outside the furnace, which not only improves the maintenance environment and enhances the maintenance quality, but also shortens the maintenance time, achieving multiple benefits.

[0033] Third, the technical solution provided by this utility model reduces the number of times heat exchangers need to be repaired due to shaking and cracking by 80% in actual production practice, and reduces the repair time for heat exchanger leakage from 8 hours to 4 hours. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the heat exchanger of this utility model;

[0035] Figure 2 This is a partial enlarged view of the tubes and shell of a heat exchanger using existing technology.

[0036] Figure 3 This is a partial enlarged view of the heat exchanger tubes of this utility model;

[0037] Figure 4 , Figure 5 This is a schematic diagram of the fluidized bed of this utility model.

[0038] Among them, 1 is the steam inlet, 2 is the heat exchanger tubes, 3 is the wall plate, and 4 is the weld joint between the tubes and the wall plate.

[0039] 5. Pipe sleeve, 6. Welding joint between pipe sleeve and wall panel, 7. Fluidized bed, 8. Heat exchanger, 9. Connecting bolts, 10. Wall panel support wheels, 11. Mobile maintenance vehicle. Detailed Implementation

[0040] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] A fluidized bed heat exchanger, one side of which is fixed inside a fluidized bed 7 by bolts 9, includes:

[0042] The heat exchanger tube 2 includes multiple spaced-apart curved tubes, the upper end of which is the steam inlet 1 and the lower end of which is the steam and condensate outlet.

[0043] The wall panel 3 has holes through which the heat exchanger tubes 2 pass to support the heat exchanger tubes 2;

[0044] A sleeve 5 is provided between the hole in the wall panel 3 and the heat exchanger tubes. The outer diameter of the sleeve 5 is welded and fixed to the hole, and the inner diameter of the sleeve 5 is clearance-fitted with the outer diameter of the heat exchanger tubes 2.

[0045] When steam is not supplied, the inner diameter of the sleeve 5 can slide between the heat exchanger tube 2 and the inner diameter of the sleeve 5 and the outer diameter of the heat exchanger tube 2 under the action of thermal expansion and contraction.

[0046] Both the sleeve 5 and the heat exchanger tube 2 are made of 316L stainless steel.

[0047] The lower part of the wall panel 3 is equipped with wall panel support wheels 10, which rest on the bottom plate of the fluidized bed 7.

[0048] A mobile maintenance vehicle 11 is installed at the outlet of the fluidized bed 7, and the height of the bottom plate of the mobile maintenance vehicle 11 is the same as the height of the bottom plate of the fluidized bed 7.

[0049] A method for fixing a fluidized bed heat exchanger includes the following steps:

[0050] S1. The heating sleeve 5 is expanded and placed on the heat exchanger tube 2 for cooling, so that the sleeve 5 is fixed to the heat exchanger tube 2.

[0051] S2. Insert the heat exchanger tubes 2 into the holes of the wall plate 3, and weld the sleeve 5 to the wall plate 3 for fixation.

[0052] S3. During production, steam is introduced into the heat exchanger tube 2, and the sleeve 5 is heated by heat transfer from the heat exchanger tube 2. The temperature of the heat exchanger tube 2 is slightly higher than that of the sleeve 5, and the thermal expansion volume of the heat exchanger tube 2 is slightly greater than that of the sleeve 5, so that the gap between the heat exchanger tube 2 and the hole of the wall plate 3 remains seamless.

[0053] A method for overhauling a fluidized bed heat exchanger includes the following steps:

[0054] S1. Stop the production of fluidized bed 7 and dismantle its input steam and recovery steam and condensate pipelines;

[0055] S2. Place the mobile maintenance vehicle 11 at the outlet of the fluidized bed 7 and fix it in place;

[0056] S3. Remove the connecting bolts 9 between the heat exchanger 8 and the fluidized bed 7;

[0057] S4. Pull out heat exchanger 8 onto mobile maintenance vehicle 11 for repair or complete replacement;

[0058] S5. After the maintenance is completed, push the heat exchanger 8 on the mobile maintenance vehicle 11 into the fluidized bed.

[0059] S6. Install the connecting bolts between heat exchanger 8 and fluidized bed 7, and resume production.

[0060] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A fluidized bed heat exchanger, fixed within a fluidized bed (7), comprising: The heat exchanger tubes (2) include multiple spaced curved tubes, the upper end of which is a steam inlet (1) and the lower end of which is a steam and condensate outlet. The wall panel (3) has holes through which the heat exchanger tubes (2) pass to support the heat exchanger tubes (2); The feature is that a sleeve (5) is provided between the hole of the wall plate (3) and the heat exchanger tubes, the outer diameter of the sleeve (5) is fixed to the hole of the wall plate (3), and the inner diameter of the sleeve (5) is clearance-fitted with the outer diameter of the heat exchanger tubes (2). When steam is not supplied, the inner diameter of the sleeve (5) can slide between the heat exchanger tubes (2). When steam is supplied, the inner diameter of the sleeve (5) and the outer diameter of the heat exchanger tubes (2) are interference-fitted under the action of thermal expansion and contraction.

2. The fluidized bed heat exchanger according to claim 1, characterized in that, The sleeve (5) is welded and fixed to the wall panel (3).

3. The fluidized bed heat exchanger according to claim 1, characterized in that, The materials of the sleeve (5) and the heat exchanger tubes (2) are both 316L stainless steel.

4. A fluidized bed heat exchanger according to claim 1, characterized in that, The heat exchanger (8) is bolted to the fluidized bed (7) on one side.

5. A fluidized bed heat exchanger according to claim 1, characterized in that, The lower part of the wall panel (3) is equipped with a wall panel support wheel (10), which rests on the bottom plate of the fluidized bed (7).

6. A fluidized bed heat exchanger according to claim 1, characterized in that, A mobile maintenance vehicle (11) is installed at the outlet of the fluidized bed (7), and the height of the bottom plate of the mobile maintenance vehicle (11) is the same as the height of the bottom plate of the fluidized bed (7).

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