Condensate water two-stage heat exchange device

Abstract

The utility model belongs to the technical field of heat recovery, and particularly relates to a condensate water two-stage heat exchange device which comprises a first-stage heat exchange box and a second-stage heat exchange box, a first connecting pipe is fixedly connected between the first-stage heat exchange box and the second-stage heat exchange box, the first-stage heat exchange box is fixedly connected with a first water inlet pipe, and the second-stage heat exchange box is fixedly connected with a second water inlet pipe. A first heat exchange pipe fixedly communicating with the first water inlet pipe and the first connecting pipe is arranged in the first-stage heat exchange box, a second heat exchange pipe fixedly communicating with the first connecting pipe is arranged in the second-stage heat exchange box, the second heat exchange pipe fixedly communicates with a first water outlet pipe, and the first water outlet pipe fixedly penetrates through the second-stage heat exchange box. The bottom of the side wall of the second-stage heat exchange box fixedly communicates with a second water inlet pipe, the top of the second-stage heat exchange box fixedly communicates with a second connecting pipe, the end, away from the second-stage heat exchange box, of the second connecting pipe fixedly communicates with the bottom of the side wall of the first-stage heat exchange box, and the top of the first-stage heat exchange box fixedly communicates with a second water outlet pipe. The condensate water recycling device has the effect of recycling heat in condensate water.

Description

Technical Field

[0001] This utility model belongs to the field of heat recovery technology, specifically a two-stage heat exchange device for condensate. Background Technology

[0002] The high-temperature steam used in the alumina plant is produced by heating demineralized water in a boiler. After releasing heat during the alumina production process, the high-temperature steam will form condensate.

[0003] After high-temperature steam forms condensate, the condensate still has a high temperature. If the condensate is discharged directly, the heat in the condensate cannot be effectively recovered and utilized, resulting in heat loss. How to recover and utilize the heat in the condensate is a problem that needs to be solved in the current production process. Utility Model Content

[0004] To address the problems mentioned above, this invention provides a two-stage heat exchange device for condensate. The demineralized water first absorbs heat from the condensate in the second heat exchange tube. The demineralized water in the first heat exchange box exchanges heat with the condensate in the first heat exchange tube. The demineralized water then absorbs heat again from the condensate in the first heat exchange tube. The demineralized water, now at a certain temperature, is discharged through the second outlet pipe for subsequent heating to high-temperature steam in a boiler. The demineralized water is preheated after passing through both the second and first heat exchange boxes, effectively recovering and utilizing heat from the condensate and reducing heat loss.

[0005] This utility model provides a two-stage heat exchange device for condensate, including a primary heat exchange box and a secondary heat exchange box. A first connecting pipe is fixedly connected between the primary and secondary heat exchange boxes. A first inlet pipe is fixedly connected to the side of the primary heat exchange box away from the secondary heat exchange box. A first heat exchange pipe is provided inside the primary heat exchange box and is fixedly connected to the first inlet pipe and the first connecting pipe. A second heat exchange pipe is provided inside the secondary heat exchange box and is fixedly connected to the first connecting pipe. A first outlet pipe is fixedly connected to the end of the second heat exchange pipe away from the first connecting pipe. The first outlet pipe is fixedly connected through the secondary heat exchange box. A second inlet pipe is fixedly connected to the bottom of the side wall of the secondary heat exchange box. A second connecting pipe is fixedly connected to the top of the secondary heat exchange box. The end of the second connecting pipe away from the secondary heat exchange box is fixedly connected to the bottom of the side wall of the primary heat exchange box. A second outlet pipe is fixedly connected to the top of the primary heat exchange box.

[0006] Furthermore, multiple first heat exchange fins are fixedly connected to the outer wall of the first heat exchange tube.

[0007] Furthermore, multiple second heat exchange fins are fixedly connected to the outer wall of the second heat exchange tube.

[0008] Furthermore, the end of the first outlet pipe furthest from the secondary heat exchanger is fixedly connected to a collection tank, and the bottom of the side wall of the collection tank is fixedly connected to a drain pipe, which is fixedly connected to a valve.

[0009] Furthermore, the upper surface of the collection bucket is provided with ventilation holes.

[0010] Furthermore, a filter screen is placed above the vent holes on the upper surface of the collection bucket, and a fixing frame is fixedly connected to the side wall of the filter screen. A fixing component is provided between the fixing frame and the collection bucket.

[0011] Furthermore, the fixing component includes a pair of fixing rods fixedly connected to the upper surface of the collection bucket. The fixing frame is provided with fixing holes for the pair of fixing rods to be inserted into respectively. The side wall of the fixing frame is provided with insertion holes that communicate with the fixing holes. The side of the fixing rod near the fixing hole is provided with an insertion groove, and an insertion rod that is inserted into the insertion hole and inserted into the insertion groove is inserted into the insertion hole.

[0012] Furthermore, a first magnet is fixedly connected to one end of the plug rod near the fixed rod, and a second magnet that abuts against the first magnet is fixedly connected to the bottom of the plug groove.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] (1) The demineralized water first absorbs the heat from the condensate in the second heat exchange tube. The demineralized water in the first heat exchange box exchanges heat with the condensate in the first heat exchange tube. The demineralized water absorbs the heat from the condensate in the first heat exchange tube again. The demineralized water with a certain temperature is discharged through the second outlet pipe for subsequent boiler heating of the demineralized water to high temperature steam. After passing through the second heat exchange box and the first heat exchange box, the demineralized water is preheated, which has the effect of recovering and utilizing the heat in the condensate and reducing heat loss.

[0015] (2) The first heat exchange fin increases the heat exchange efficiency of the first heat exchange tube, and the second heat exchange fin increases the heat exchange efficiency of the second heat exchange tube.

[0016] (3) The vent is used to balance the air pressure in the collection bucket when the condensate flows into the collection bucket and when the condensate is discharged through the drain pipe, so that the condensate in the collection bucket can flow in and out smoothly. The filter screen reduces the possibility of dust and other impurities falling into the collection bucket through the vent. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0019] Figure 2 This is a schematic diagram illustrating the structure of the first heat exchange tube in this embodiment;

[0020] Figure 3 This is a schematic diagram illustrating the structure of the second heat exchange tube in this embodiment;

[0021] Figure 4 This is a schematic diagram illustrating the structure of the vent holes in this embodiment;

[0022] Figure 5 This is a schematic diagram illustrating the structure of the filter screen in this embodiment;

[0023] Figure 6 This is a schematic diagram illustrating the structure of the plug-in rod in this embodiment.

[0024] Explanation of reference numerals in the attached drawings: 1. Primary heat exchanger; 11. First connecting pipe; 12. First inlet pipe; 13. First heat exchange tube; 131. First heat exchange fin; 14. Second outlet pipe; 2. Secondary heat exchanger; 21. Second heat exchange tube; 211. Second heat exchange fin; 22. First outlet pipe; 23. Second inlet pipe; 24. Second connecting pipe; 3. Collection tank; 31. Drain pipe; 311. Valve; 32. Vent hole; 4. Filter screen; 41. Fixing frame; 5. Fixing assembly; 51. Fixing rod; 52. Fixing hole; 53. Insertion hole; 54. Insertion groove; 541. Second magnet; 55. Insertion rod; 551. First magnet. Detailed Implementation

[0025] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] The following is in conjunction with the appendix Figure 1 To be continued Figure 6 The present invention will be described in detail with specific embodiments.

[0027] like Figures 1 to 6 As shown, the present invention provides a two-stage heat exchange device for condensate, including a primary heat exchange box 1 and a secondary heat exchange box 2. A first connecting pipe 11 is fixedly connected between the primary heat exchange box 1 and the secondary heat exchange box 2. The end of the first connecting pipe 11 near the primary heat exchange box 1 is inserted into the primary heat exchange box 1, and the end of the first connecting pipe 11 near the secondary heat exchange box 2 is inserted into the secondary heat exchange box 2.

[0028] A first water inlet pipe 12 is fixedly connected to the side of the primary heat exchange box 1 away from the secondary heat exchange box 2. The end of the first water inlet pipe 12 is placed inside the primary heat exchange box 1 and the first water inlet pipe 12 is fixedly connected to a first heat exchange pipe 13. The end of the first heat exchange pipe 13 away from the first water inlet pipe 12 is fixedly connected to a first connecting pipe 11.

[0029] The secondary heat exchange box 2 is provided with a second heat exchange tube 21, which is fixedly connected to the first connecting pipe 11. The end of the second heat exchange tube 21 away from the first connecting pipe 11 is fixedly connected to a first water outlet pipe 22. The first water outlet pipe 22 passes through the secondary heat exchange box 2 and is fixedly connected to the secondary heat exchange box 2.

[0030] The condensate flows sequentially through the first inlet pipe 12, the first heat exchange pipe 13, the first connecting pipe 11, the second heat exchange pipe 21, and the first outlet pipe 22, and is discharged from the first outlet pipe 22.

[0031] A second water inlet pipe 23 is fixedly connected to the bottom of the side wall of the secondary heat exchanger 2, and the second water inlet pipe 23 is connected to the interior of the secondary heat exchanger 2. A second connecting pipe 24 is fixedly connected to the top of the secondary heat exchanger 2, and the second connecting pipe 24 is connected to the interior of the secondary heat exchanger 2. The end of the second heat exchange pipe 21 away from the secondary heat exchanger 2 is fixedly connected to the bottom of the side wall of the primary heat exchanger 1, and the second heat exchange pipe 21 is connected to the interior of the primary heat exchanger 1. A second water outlet pipe 14 is fixedly connected to the top of the primary heat exchanger 1, and the second water outlet pipe 14 is connected to the interior of the primary heat exchanger 1.

[0032] The demineralized water enters the secondary heat exchanger 2 through the second inlet pipe 23. The demineralized water in the secondary heat exchanger 2 enters the primary heat exchanger 1 through the second connecting pipe 24. The demineralized water in the primary heat exchanger 1 is discharged through the second outlet pipe 14. The demineralized water in the secondary heat exchanger 2 exchanges heat with the condensate in the second heat exchange tube 21. The demineralized water first absorbs the heat from the condensate in the second heat exchange tube 21. The demineralized water in the primary heat exchanger 1 exchanges heat with the condensate in the first heat exchange tube 13. The demineralized water absorbs the heat from the condensate in the first heat exchange tube 13 again. The demineralized water with a certain temperature is discharged through the second outlet pipe 14 for subsequent boiler heating to high-temperature steam. After passing through the secondary heat exchanger 2 and the primary heat exchanger 1, the demineralized water is preheated, which has the effect of recovering and utilizing the heat in the condensate and reducing heat loss.

[0033] Multiple first heat exchange fins 131 are fixedly connected to the outer wall of the first heat exchange tube 13. The first heat exchange fins 131 are placed in the first-stage heat exchange box 1. The first heat exchange fins 131 are in contact with the demineralized water. The first heat exchange fins 131 increase the heat exchange efficiency of the first heat exchange tube 13.

[0034] Multiple second heat exchange fins 211 are fixedly connected to the outer wall of the second heat exchange tube 21. The second heat exchange fins 211 are placed inside the secondary heat exchange box 2. The second heat exchange fins 211 are in contact with the demineralized water and increase the heat exchange efficiency of the second heat exchange tube 21.

[0035] A collection tank 3 is fixedly connected to the end of the first outlet pipe 22 away from the secondary heat exchanger 2. The condensate after heat exchange flows into the collection tank 3 through the first outlet pipe 22 for storage. A drain pipe 31 is fixedly connected to the bottom of the collection tank 3 on the side away from the first outlet pipe 22, and a valve 311 is fixedly connected to the drain pipe 31. When it is necessary to recycle the condensate in the collection tank 3, the valve 311 is opened, and the condensate in the collection tank 3 is discharged through the drain pipe 31.

[0036] The upper surface of the collection bucket 3 is provided with a vent hole 32. The vent hole 32 is used to balance the air pressure in the collection bucket 3 when condensate flows into the collection bucket 3 and when condensate is discharged through the drain pipe 31, so that the condensate in the collection bucket 3 can flow in and out smoothly.

[0037] A filter screen 4 is abutted against the upper surface of the collection bucket 3. A fixing frame 41 is fixedly connected to the side wall of the filter screen 4, and the fixing frame 41 is arranged around the filter screen 4. The filter screen 4 is positioned above the vent hole 32. A fixing component 5 is provided between the fixing frame 41 and the collection bucket 3. The fixing component 5 connects and fixes the fixing frame 41 to the collection bucket 3. The filter screen 4 reduces the possibility of dust and other impurities falling into the collection bucket 3 through the vent hole 32.

[0038] The fixing component 5 includes a pair of vertically arranged fixing rods 51 fixedly connected to the upper surface of the collection bucket 3. The upper surface of the fixing frame 41 has a pair of downward-facing fixing holes 52, with each fixing hole 52 corresponding to one of the fixing rods 51, and the fixing rods 51 are inserted into the fixing holes 52. A pair of side walls of the fixing frame 41 are respectively provided with insertion holes 53, with each insertion hole 53 corresponding to one of the fixing holes 52 and communicating with the fixing holes 52.

[0039] The fixing rod 51 has a insertion groove 54 on the side near the insertion hole 53. An insertion rod 55 is inserted into the insertion hole 53. The insertion rod 55 is inserted into the insertion groove 54. The insertion rod 55 connects and fixes the fixing frame 41 to the fixing rod 51, thereby connecting and fixing the fixing frame 41 to the collection bucket 3.

[0040] A first magnet 551 is fixedly connected to one end of the plug rod 55 near the fixed rod 51, and a second magnet 541 is provided in the plug groove 54. The second magnet 541 is fixedly connected to the fixed rod 51. When the plug rod 55 is plugged into the plug groove 54, the first magnet 551 and the second magnet 541 attract and abut against each other, thereby increasing the stability of the plug rod 55 plugging into the plug groove 54.

[0041] When the filter screen 4 needs to be cleaned, separate the insertion rod 55 from the insertion slot 54. The insertion rod 55 releases the restriction on the fixing rod 51, and the fixing frame 41 is separated from the fixing rod 51. Then, clean the filter screen 4. After cleaning, insert the fixing rod 51 into the fixing hole 52 and the insertion rod 55 into the insertion slot 54. The first magnet 551 and the second magnet 541 attract and abut against each other.

[0042] The implementation principle of the two-stage heat exchange device for condensate provided by this utility model is as follows: condensate sequentially passes through the first inlet pipe 12, the first heat exchange pipe 13, the first connecting pipe 11, the second heat exchange pipe 21, and the first outlet pipe 22. The condensate is discharged from the first outlet pipe 22 and flows into the collection tank 3. Demineralized water enters the second-stage heat exchange box 2 through the second inlet pipe 23. The demineralized water in the second-stage heat exchange box 2 enters the first-stage heat exchange box 1 through the second connecting pipe 24. The demineralized water in the first-stage heat exchange box 1 is discharged through the second outlet pipe 14. The demineralized water in the second-stage heat exchange box 2 exchanges heat with the condensate in the second heat exchange pipe 21. The demineralized water first absorbs heat from the condensate in the second heat exchange pipe 21. The demineralized water in the first-stage heat exchange box 1 exchanges heat with the condensate in the first heat exchange pipe 13. The demineralized water with a certain temperature is discharged through the second outlet pipe 14 for subsequent boiler heating of the demineralized water to high-temperature steam.

[0043] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A two-stage heat exchanger for condensate, characterized in that, The system includes a primary heat exchanger (1) and a secondary heat exchanger (2). A first connecting pipe (11) is fixedly connected between the primary heat exchanger (1) and the secondary heat exchanger (2). A first inlet pipe (12) is fixedly connected to the side of the primary heat exchanger (1) away from the secondary heat exchanger (2). A first heat exchange pipe (13) is fixedly connected to the first inlet pipe (12) and the first connecting pipe (11) inside the primary heat exchanger (1). A second heat exchange pipe (21) is fixedly connected to the first connecting pipe (11) inside the secondary heat exchanger (2). The end of the second heat exchange tube (21) away from the first connecting pipe (11) is fixedly connected to the first water outlet pipe (22). The first water outlet pipe (22) is fixedly connected through the second heat exchange box (2). The bottom of the side wall of the second heat exchange box (2) is fixedly connected to the second water inlet pipe (23). The top of the second heat exchange box (2) is fixedly connected to the second connecting pipe (24). The end of the second connecting pipe (24) away from the second heat exchange box (2) is fixedly connected to the bottom of the side wall of the first heat exchange box (1). The top of the first heat exchange box (1) is fixedly connected to the second water outlet pipe (14).

2. The two-stage heat exchanger for condensate water according to claim 1, characterized in that, Multiple first heat exchange fins (131) are fixedly connected to the outer wall of the first heat exchange tube (13).

3. The two-stage heat exchanger for condensate water according to claim 1, characterized in that, The outer wall of the second heat exchange tube (21) is fixedly connected with a plurality of second heat exchange fins (211).

4. The two-stage heat exchanger for condensate water according to claim 1, characterized in that, The first outlet pipe (22) is fixedly connected to a collection bucket (3) at one end away from the secondary heat exchange box (2). The bottom of the side wall of the collection bucket (3) is fixedly connected to a drain pipe (31), and the drain pipe (31) is fixedly connected to a valve (311).

5. A two-stage heat exchanger for condensate water according to claim 4, characterized in that, The upper surface of the collection bucket (3) is provided with ventilation holes (32).

6. A two-stage heat exchanger for condensate water according to claim 5, characterized in that, The upper surface of the collection bucket (3) is abutted by a filter screen (4) placed above the vent (32). A fixing frame (41) is fixedly connected to the side wall of the filter screen (4). A fixing component (5) is provided between the fixing frame (41) and the collection bucket (3).

7. A two-stage heat exchanger for condensate water according to claim 6, characterized in that, The fixing component (5) includes a pair of fixing rods (51) fixedly connected to the upper surface of the collection bucket (3). The fixing frame (41) is provided with fixing holes (52) for the pair of fixing rods (51) to be inserted into respectively. The side wall of the fixing frame (41) is provided with insertion holes (53) communicating with the fixing holes (52). The side of the fixing rod (51) near the fixing hole (52) is provided with an insertion groove (54). An insertion rod (55) that is inserted into the insertion groove (54) is inserted into the insertion hole (53).

8. A two-stage heat exchanger for condensate water according to claim 7, characterized in that, The first magnet (551) is fixedly connected to one end of the plug rod (55) near the fixed rod (51), and the second magnet (541) that abuts against the first magnet (551) is fixedly connected to the bottom of the plug groove (54).

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