Heat exchanger convenient to maintain

Abstract

The utility model relates to a heat exchanger convenient to maintain, and belongs to the technical field of heat exchangers. The heat exchange pipes are connected in series through a plurality of connecting pipes. The heat exchange pipe comprises an inner pipe inserted into the smoke box, a plugging cap is arranged at one end of the inner pipe in a matched mode, the connecting pipe is connected to the plugging cap and communicated with the interior of the inner pipe, and a heat conduction cylinder is arranged on the inner pipe in a sleeving mode and arranged in the smoke box. The heat conduction cylinder comprises a cylinder body arranged on the inner pipe in a sleeving mode, a plurality of heat conduction pieces are evenly arranged on the outer wall of the cylinder body, and a maintenance handle is arranged at one end of the cylinder body. Flue gas is in direct contact with the heat conduction cylinder arranged on the inner pipe in a sleeving mode, smoke dust can be transferred and attached to the heat conduction cylinder, when the heat exchanger is maintained, the heat conduction cylinder is manually and rapidly taken down from the heat exchange pipe and then transferred to the outside for comprehensive cleaning, the situation that cleaning operation is limited by the narrow space of the heat exchanger is avoided, and after cleaning is completed, the heat conduction cylinder is rapidly inserted into the heat exchanger; the maintenance process is efficient and convenient, and the production continuity is improved.

Description

Technical Field

[0001] The utility model relates to a heat exchanger which is convenient for maintenance, belonging to the technical field of heat exchangers. Background Art

[0002] As a key device in the industrial waste heat recovery system, the flue gas heat exchanger is widely used in high-temperature flue gas treatment scenarios such as boilers and kilns. It realizes the heat exchange between flue gas and cold medium through heat exchange tubes, which can effectively improve the energy utilization rate.

[0003] Traditional flue gas heat exchangers mostly adopt a fixed tube sheet structure, where the heat exchange tube bundle is welded and fixed to the tube sheet and encapsulated in the shell. During actual operation, dust particles contained in the flue gas are likely to continuously adhere to the outer wall of the heat exchange tubes, gradually forming a dense ash layer, resulting in a significant decrease in heat transfer efficiency. In severe cases, it may even cause blockage of the flue gas channel. To maintain the normal operation of the equipment, it is necessary to regularly stop the machine for tube bundle cleaning or replacement operations.

[0004] However, the current maintenance operations have significant operational limitations: operators need to clean the outer wall of the fixed tube bundle with tools in the narrow space inside the shell, and the cleaning operation is very inconvenient; in addition, the spacing between the tube bundles is small, making it difficult to effectively control the ash cleaning tools and prone to cleaning dead corners; the above cleaning process is time-consuming, laborious and inefficient, affecting production continuity. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is: to overcome the deficiencies of the prior art and provide a heat exchanger which is convenient for maintenance, enabling manual cleaning of the heat exchange pipeline comprehensively, efficiently and conveniently, and improving the efficiency and convenience of the heat exchanger maintenance operation.

[0006] A heat exchanger which is convenient for maintenance of the utility model includes: a flue gas box with a plurality of groups of heat exchange tubes inserted thereon; the heat exchange tubes are connected in series through a plurality of connecting tubes.

[0007] The heat exchange tube includes: an inner tube inserted into the flue gas box, one end of the inner tube is provided with a plugging cap in cooperation, the connecting tube is connected to the plugging cap and is communicated with the inside of the inner tube, and a heat conduction cylinder is sleeved on the inner tube, and the heat conduction cylinder is placed inside the flue gas box.

[0008] The heat conduction cylinder includes: a cylinder body sleeved on the inner tube, a plurality of heat conduction fins are uniformly arranged on the outer wall of the cylinder body, and a maintenance handle is provided at one end of the cylinder body.

[0009] Further, an air inlet and an air outlet are provided on the flue gas box, a plurality of seat holes are provided on the side surface of the flue gas box, and the inner tube can be inserted into the seat holes; a maintenance window is also provided on the side surface of the flue gas box.

[0010] A cover plate is provided on the maintenance window.

[0011] Furthermore, the inner tube includes: a tube body, and a partition is arranged inside the tube body, and the partition divides the inside of the tube body into several chambers.

[0012] A convex ring and a clamping groove are arranged on the outer wall of the tube body, a retaining ring is clamped in the clamping groove, and the barrel body can be axially fixed between the convex ring and the retaining ring.

[0013] A sealing cap is arranged on the pipe orifice of the tube body in a matching manner.

[0014] Furthermore, a liquid changing port is arranged on the sealing cap, the liquid changing port is communicated with the chamber, and a connecting pipe is inserted into the liquid changing port.

[0015] Furthermore, the cover plate includes: a disassembly and assembly handle is arranged on the bottom plate, and a heat preservation layer is further covered on the outer side of the bottom plate.

[0016] Furthermore, a heat insulation coating is applied to the outer surface of the flue gas box.

[0017] The beneficial effects of the present utility model compared with the prior art are as follows:

[0018] The flue gas is in direct contact with the heat conduction cylinder sleeved on the inner tube, and the soot can be transferred and adhered to the heat conduction cylinder. When the heat exchanger is maintained, the heat conduction cylinder can be quickly removed from the heat exchange tube manually and then transferred to the outside for comprehensive cleaning, avoiding the limitation of the narrow space of the heat exchanger for cleaning operations. After the cleaning is completed, the heat conduction cylinder is quickly inserted into the heat exchanger again. The maintenance process is efficient and convenient, and the production continuity is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the first structural schematic diagram of a heat exchanger convenient for maintenance of the present utility model;

[0020] Figure 2 is the second structural schematic diagram of a heat exchanger convenient for maintenance of the present utility model;

[0021] Figure 3 is the structural schematic diagram of the flue gas box of a heat exchanger convenient for maintenance of the present utility model;

[0022] Figure 4 is the structural schematic diagram of the assembly of the heat exchange tubes of a heat exchanger convenient for maintenance of the present utility model;

[0023] Figure 5 is the split structural schematic diagram of the heat exchange tubes of a heat exchanger convenient for maintenance of the present utility model;

[0024] Figure 6 is the sectional structural schematic diagram of the heat exchange tubes of a heat exchanger convenient for maintenance of the present utility model.

[0025] In the figure:

[0026] 1. Flue gas box; 101. Inlet port; 102. Seat hole; 103. Maintenance window; 104. Outlet port;

[0027] 2. Heat exchange tube; 201. Inner tube; 2011. Tube body; 2012. Partition board; 2013. Chamber; 2014. Convex ring; 2015. Card slot; 202. Heat conduction cylinder; 2021. Cylinder body; 2022. Heat conduction fin; 2023. Maintenance handle; 203. Retaining ring; 204. Sealing cap; 2041. Liquid changing port;

[0028] 3. Connecting pipe;

[0029] 4. Cover plate; 401. Bottom plate; 402. Thermal insulation layer; 403. Disassembly and assembly handle. Specific implementation mode

[0030] As Figures 1 - 6 shown, this embodiment is realized through the following technical solutions: A number of groups of heat exchange tubes 2 are inserted into the flue gas box 1; the heat exchange tubes 2 are connected in series through a number of connecting pipes 3.

[0031] The heat exchange tube 2 includes: an inner tube 201 inserted into the flue gas box 1, one end of the inner tube 201 is cooperatively provided with a sealing cap 204, the connecting pipe 3 is connected to the sealing cap 204 and communicated with the inside of the inner tube 201, and a heat conduction cylinder 202 is sleeved on the inner tube 201, and the heat conduction cylinder 202 is placed inside the flue gas box 1.

[0032] The heat conduction cylinder 202 includes: a cylinder body 2021 sleeved on the inner tube 201, a number of heat conduction fins 2022 are evenly arranged on the outer wall of the cylinder body 2021, and a maintenance handle 2023 is provided at one end of the cylinder body 2021.

[0033] The heat conduction fins 2022 can increase the contact area between the heat conduction cylinder 202 and the flue gas, and improve the heat conduction ability of the heat conduction cylinder 202.

[0034] Specifically, the flue gas box 1 is provided with an inlet port 101 and an outlet port 104, and a number of seat holes 102 are provided on the side of the flue gas box 1, and the inner tube 201 can be inserted into the seat holes 102; a maintenance window 103 is also provided on the side of the flue gas box 1.

[0035] In this embodiment, an interference fit is adopted between the inner tube 201 and the seat hole 102; one end of the inner tube 201 protrudes from the seat hole 102, as Figure 1 shown; one side of the convex ring 2014 abuts against the inner wall of the flue gas box 1, and the inner tube 201 realizes its axial positioning on the flue gas box 1 through the convex ring 2014.

[0036] A cover plate 4 is provided on the maintenance window 103. When maintaining the heat exchanger, an operator can remove the cover plate 4 and perform maintenance operations on the heat exchange tube 2 through the maintenance window 103.

[0037] Specifically, the inner tube 201 includes: a tube body 2011, and a partition 2012 is provided inside the tube body 2011. The partition 2012 divides the interior of the tube body 2011 into several chambers 2013.

[0038] Specifically, the cold medium is introduced into the chamber 2013 of the heat exchange tube 2 through the connecting pipe 3. The cold medium flows between multiple groups of heat exchange tubes 2, and the cold medium exchanges heat with the high-temperature flue gas in the flue gas box 1 through the inner tube 201 and the heat conduction cylinder 202.

[0039] A convex ring 2014 and a clamping groove 2015 are provided on the outer wall of the tube body 2011. A retaining ring 203 is clamped in the clamping groove 2015, and the barrel body 2021 can be axially fixed between the convex ring 2014 and the retaining ring 203.

[0040] The sealing cap 204 is fitted onto the pipe orifice of the tube body 2011.

[0041] Specifically, the sealing cap 204 is provided with a liquid changing port 2041, and the liquid changing port 2041 communicates with the chamber 2013. The connecting pipe 3 is inserted into the liquid changing port 2041 to ensure the continuous conveyance of the cold medium in the pipeline.

[0042] Specifically, the cover plate 4 includes: a bottom plate 401 is provided with a disassembly and assembly handle 403, and a heat insulation layer 402 is further covered on the outside of the bottom plate 401.

[0043] Specifically, the outer surface of the flue gas box 1 is coated with a heat insulation coating to reduce the heat dissipation of the flue gas box 1 to the outside.

[0044] The specific working principle of the present utility model is as follows:

[0045] After the high-temperature flue gas inside the flue gas box 1 enters through the air inlet 101, it comes into full contact with the heat conduction fins 2022 on the surface of the heat conduction cylinder 202 when flowing through the heat conduction cylinder 202. The heat of the flue gas is quickly transferred to the barrel body 2021 through the heat conduction fins 2022. The heat conduction cylinder 202 is in contact with the inner tube 201 to form a heat conduction path. When the cold medium flows through the chambers 2013 of each series-connected heat exchange tube 2 in sequence through the connecting pipe 3, it continuously absorbs the heat of the flue gas through the wall of the tube body 2011 of the inner tube 201 and the heat conduction cylinder 202, thereby realizing heat exchange.

[0046] When maintaining the heat exchange tube 2, manually hold the disassembly and assembly handle 403 to remove the cover plate 4, and check or replace the heat exchange tube 2 through the maintenance window 103; when maintaining the heat exchange tube 2, first remove the retaining ring 203 from the inner tube 201, and then manually hold the maintenance handle 2023 to remove the heat conduction cylinder 202 from the inner tube 201 and transfer it to the outside for cleaning. Further, manually re-insert the cleaned heat conduction cylinder 202 onto the inner tube 201 and install the retaining ring 203 to axially fix the heat conduction cylinder 202. After the heat conduction cylinder 202 is maintained, then install the cover plate 4 onto the flue gas box 1, and the maintenance process is efficient and convenient.

[0047] Certainly, the above content is only a preferred embodiment of the present utility model and cannot be considered as limiting the scope of the embodiments of the present utility model. The present utility model is not limited to the above examples either. Equivalent changes and improvements made by those of ordinary skill in the art within the essence of the present utility model shall all fall within the scope covered by the patent of the present utility model.

Claims

1. A heat exchanger that is easy to maintain, characterized in that: It comprises a smoke box (1), on which a plurality of groups of heat exchange tubes (2) are inserted; the heat exchange tubes (2) are connected in series via a plurality of connecting tubes (3); The heat exchange tube (2) comprises: an inner tube (201) inserted into the smoke box (1), one end of the inner tube (201) being provided with a sealing cap (204), a connecting tube (3) being connected to the sealing cap (204) and communicating with the interior of the inner tube (201), a heat conducting tube (202) being sleeved on the inner tube (201), and the heat conducting tube (202) being placed inside the smoke box (1); The heat-conducting tube (202) comprises: a tube body (2021) sleeved on the inner tube (201), a plurality of heat-conducting sheets (222) being evenly arranged on the outer wall of the tube body (2021), and a maintenance handle (223) being arranged at one end of the tube body (2021).

2. A heat exchanger easy to maintain according to claim 1, characterized in that: An air inlet (101) and an air outlet (104) are provided on the smoke box (1); a plurality of seat holes (102) are provided on the side of the smoke box (1); the inner tube (201) can be inserted into the seat holes (102); a maintenance window (103) is also provided on the side of the smoke box (1); A cover plate (4) is provided on the maintenance window (103).

3. The heat exchanger easy to maintain according to claim 2, characterized in that: The inner tube (201) comprises: a tube body (2011), wherein a partition (2012) is provided inside the tube body (2011), and the partition (2012) divides the inside of the tube body (2011) into a plurality of chambers (2013); A convex ring (2014) and a retaining ring (2015) are provided on the outer wall of the tube body (211); a retaining ring (203) is retained in the retaining ring (2015); and the barrel body (221) can be axially fixed between the convex ring (2014) and the retaining ring (203); The blocking cap (204) is arranged on the pipe opening of the pipe body (2011).

4. The heat exchanger easy to maintain according to claim 3, characterized in that: The blocking cap (204) is provided with a fluid exchange port (2041), the fluid exchange port (2041) is in communication with the chamber (2013), and the connecting tube (3) is inserted into the fluid exchange port (2041).

5. The heat exchanger easy to maintain according to claim 2, characterized in that: The cover plate (4) comprises: a bottom plate (401) provided with a disassembly handle (403), and the outer side of the bottom plate (401) is also covered with a heat-insulating layer (402).

6. The heat exchanger easy to maintain according to claim 1, characterized in that: The outer surface of the smoke box (1) is coated with a heat insulation coating.

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