A heat exchanger and heat exchange method

Abstract

This invention discloses a heat exchanger and heat exchange method, in which the water chambers of a first thin-walled barrel-type heat exchanger, a second thin-walled barrel-type heat exchanger, and a third thin-walled barrel-type heat exchanger are sequentially connected. The water chamber of the first thin-walled barrel-type heat exchanger is connected to a steam outlet pipe, and the water chamber of the third thin-walled barrel-type heat exchanger is connected to a third water inlet pipe. Water in the third water inlet pipe can pass through the three water chambers and then be discharged through the steam outlet pipe. The inner chamber of the first thin-walled barrel-type heat exchanger is a first flue gas chamber, a second flue gas chamber is provided between the second and first thin-walled barrel-type heat exchangers, and a third flue gas chamber is provided between the third and second thin-walled barrel-type heat exchangers. The first, second, and third flue gas chambers are sequentially connected. The flue gas generated by the burner can enter the first, second, and third flue gas chambers and exchange heat with the water in the three water chambers. This improves the heat exchange efficiency.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, and more particularly to a heat exchanger and a heat exchange method. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Existing barrel-type heat exchangers mainly consist of a water chamber on the barrel wall, with a burner inside. Water is injected into the water chamber, and the heat generated by the burner heats the water, causing it to turn into steam and be discharged. Current heat exchangers primarily increase their volume to improve heat exchange efficiency, resulting in a large overall size and low thermal energy utilization. To address this, a waste heat recovery device is added to the heat exchanger to recover the waste heat after heat exchange and return it to the heat exchanger barrel to participate in the heat exchange process with water. However, this method is affected by the heat exchange area and heat exchange intensity, and the heat exchange efficiency remains low. Summary of the Invention

[0004] In order to solve the above problems, the present invention proposes a heat exchanger and a heat exchange method, which improves the heat exchange efficiency of the heat exchanger.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In one aspect, a heat exchanger is proposed, comprising a first thin-walled barrel-type heat exchanger, a second thin-walled barrel-type heat exchanger, and a third thin-walled barrel-type heat exchanger; the water chambers of the first thin-walled barrel-type heat exchanger, the second thin-walled barrel-type heat exchanger, and the third thin-walled barrel-type heat exchanger are sequentially connected; the water chamber of the first thin-walled barrel-type heat exchanger is connected to a steam outlet pipe, and the water chamber of the third thin-walled barrel-type heat exchanger is connected to a third water inlet pipe; water in the third water inlet pipe can pass through the three water chambers and then be discharged through the steam outlet pipe; the inner cavity of the barrel of the first thin-walled barrel-type heat exchanger is a first flue gas cavity, and the second thin-walled barrel-type heat exchanger... A barrel-type heat exchanger is fitted over the first thin-walled barrel-type heat exchanger, with a second flue gas cavity between them; a third thin-walled barrel-type heat exchanger is fitted over the second thin-walled barrel-type heat exchanger, with a third flue gas cavity between them; the first, second, and third flue gas cavities are sequentially connected; the first flue gas cavity is connected to the burner; the flue gas generated by the burner can enter the first, second, and third flue gas cavities and exchange heat with the water in the water cavities of the first, second, and third thin-walled barrel-type heat exchangers.

[0007] Secondly, a heat exchange method for a heat exchanger proposed in the first aspect is presented, including:

[0008] Water in the third inlet pipe passes sequentially through the water chambers of the third thin-walled barrel heat exchanger, the second thin-walled barrel heat exchanger, and the first thin-walled barrel heat exchanger.

[0009] The burner is controlled to burn, and the flue gas generated by the combustion enters the first flue gas cavity, the second flue gas cavity and the third flue gas cavity in sequence to exchange heat with the water in the water cavity of the first thin-walled barrel heat exchanger, the second thin-walled barrel heat exchanger and the third thin-walled barrel heat exchanger.

[0010] After the water in the water chamber of the first thin-walled barrel-type heat exchanger exchanges heat with the flue gas in the first and second flue gas chambers, steam is formed and discharged from the steam outlet pipe.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] 1. This invention integrates a first thin-walled barrel-type heat exchanger, a second thin-walled barrel-type heat exchanger, and a third thin-walled barrel-type heat exchanger, connecting the water chambers and the three flue gas chambers. This allows the heat from heating the water in the first thin-walled barrel-type heat exchanger by the burner to heat the water in the second and third thin-walled barrel-type heat exchangers, thus achieving the recovery and utilization of waste heat from the burner. Simultaneously, the second and third thin-walled barrel-type heat exchangers increase the heat exchange area between the water and waste heat, effectively improving heat exchange efficiency.

[0013] 2. This invention utilizes the lowest temperature flue gas to heat the lowest temperature water, uses the intermediate temperature flue gas to heat the intermediate temperature water, and uses the highest temperature flue gas to heat the highest temperature water, effectively improving the heat exchange intensity and further ensuring heat exchange efficiency.

[0014] 3. The inner and outer walls of the first and second thin-walled barrel heat exchangers of the present invention can exchange heat with the flue gas generated by the burner, further improving the heat exchange efficiency and heat exchange intensity.

[0015] 4. The present invention connects multiple positioning columns between the inner cylinder wall and the outer cylinder wall, which can ensure the uniformity of the water cavity between the inner cylinder wall and the outer cylinder wall, avoid steam flow disorder, avoid local dry burning, increase the heat exchange area and heat exchange intensity, and improve the pressure resistance of the cylinder wall.

[0016] 5. The present invention provides reinforcing columns at the lower ends of both the first and second thin-walled barrel heat exchangers, and provides drainage holes on the reinforcing columns. This ensures the strength of the heat exchangers while preventing the problem of water leakage inside the heat exchangers not being able to be drained in time.

[0017] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0019] Figure 1 The overall structural diagram of the heat exchanger is disclosed in the embodiment.

[0020] Figure 2 A front view of a first thin-walled barrel heat exchanger is disclosed for an embodiment.

[0021] Figure 3 A top view of a first thin-walled barrel heat exchanger is disclosed for an embodiment;

[0022] Figure 4 A front view of the second thin-walled barrel heat exchanger is disclosed for an embodiment;

[0023] Figure 5 A top view of a second thin-walled barrel heat exchanger is disclosed for an embodiment;

[0024] Figure 6 A front view of the third thin-walled barrel heat exchanger is disclosed for an embodiment.

[0025] Figure 7 A top view of a third thin-walled barrel heat exchanger is disclosed for an embodiment;

[0026] Figure 8 The diagram shows the positioning column structure disclosed in the embodiment.

[0027] The components are: 1. Burner; 42. Cylindrical burner head; 43. First thin-walled barrel heat exchanger; 44. Second thin-walled barrel heat exchanger; 45. Third thin-walled barrel heat exchanger; 57. Second connecting pipe; 60. First connecting pipe; 61. First water inlet pipe; 62. Fastening screw; 63. First annular plate; 64. Second annular plate; 65. Vertical outer cylinder wall; 66. Vertical inner cylinder wall; 67. Conical outer cylinder wall; 68. Flue pipe; 69. Conical inner cylinder wall; 70. Third annular plate; 71. Fourth annular plate; 72. First reinforcing column; 74. Support barrel; 75. Support rib plate. 76. Positioning column; 77. First ring plate; 7. Steam outlet pipe; 78. Second water outlet pipe; 79. Fifth ring plate; 80. Second ring plate; 81. Sixth ring plate; 82. Vertical outer cylinder wall; 83. Vertical inner cylinder wall; 84. Seventh ring plate; 85. Eighth ring plate; 86. Reinforcing column; 87. Second water inlet pipe; 88. Third ring plate; 89. Fourth ring plate; 90. Reinforcing pipe; 91. Ninth ring plate; 92. Tenth ring plate; 93. Vertical outer cylinder wall; 94. Vertical inner cylinder wall; 95. Third water inlet pipe; 96. Rib plate; 97. Stud; 98. Eleventh ring plate; 99. Fifth ring plate; 100. Twelfth ring plate; 101. Third water outlet pipe; 102. Thirteenth ring plate; 103. Sixth ring plate; a. Platform; b. Step; c. Platform. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0030] Example 1

[0031] In this embodiment, a thin-walled barrel-type heat exchanger is disclosed, such as... Figures 1-8As shown, it includes a first thin-walled barrel-type heat exchanger 43, a second thin-walled barrel-type heat exchanger 44, and a third thin-walled barrel-type heat exchanger 45; the water chambers of the first thin-walled barrel-type heat exchanger 43, the second thin-walled barrel-type heat exchanger 44, and the third thin-walled barrel-type heat exchanger 45 are connected in sequence; the water chamber of the first thin-walled barrel-type heat exchanger 43 is connected to the steam outlet pipe 7, and the water chamber of the third thin-walled barrel-type heat exchanger 45 is connected to the third water inlet pipe 95; the water in the third water inlet pipe 95 can be discharged through the steam outlet pipe 7 after passing through the three water chambers; the inner chamber of the first thin-walled barrel-type heat exchanger 43 is the first flue gas chamber, and the second thin-walled barrel... A first thin-walled barrel-type heat exchanger 44 is fitted outside the first thin-walled barrel-type heat exchanger 43, with a second flue gas cavity between them; a third thin-walled barrel-type heat exchanger 45 is fitted outside the second thin-walled barrel-type heat exchanger 44, with a third flue gas cavity between them; the first flue gas cavity, the second flue gas cavity, and the third flue gas cavity are connected in sequence; the first flue gas cavity is connected to the burner 1; the flue gas generated by the burner can enter the first flue gas cavity, the second flue gas cavity, and the third flue gas cavity to exchange heat with the water in the water cavity of the first thin-walled barrel-type heat exchanger 43, the second thin-walled barrel-type heat exchanger 44, and the third thin-walled barrel-type heat exchanger 45.

[0032] The first thin-walled barrel heat exchanger 43, the second thin-walled barrel heat exchanger 44, and the third thin-walled barrel heat exchanger 45 all include an inner cylinder wall and an outer cylinder wall, with a water cavity for containing water provided between the inner cylinder wall and the outer cylinder wall; the inner cylinder wall of the first thin-walled barrel heat exchanger 43 is a first flue gas cavity; the outer cylinder wall of the first thin-walled barrel heat exchanger 43 and the inner cylinder wall of the second thin-walled barrel heat exchanger 44 are a second flue gas cavity; and the inner cylinder wall of the third thin-walled barrel heat exchanger 45 and the outer cylinder wall of the second thin-walled barrel heat exchanger 44 are a third flue gas cavity.

[0033] Preferably, multiple positioning posts 76 are connected between the inner and outer cylinder walls of the first thin-walled barrel heat exchanger 43, the second thin-walled barrel heat exchanger 44, and the third thin-walled barrel heat exchanger 45; the multiple positioning posts 76 are evenly distributed between the inner and outer cylinder walls.

[0034] In this embodiment, reinforcing columns are respectively provided at the lower ends of the first thin-walled barrel heat exchanger and the lower ends of the second thin-walled barrel heat exchanger. One end of the reinforcing column is connected to the inner wall of the heat exchanger itself, and the other end is connected to the outer wall of the heat exchanger itself. A water leakage hole is also provided on the reinforcing column.

[0035] To improve heat exchange efficiency, in this embodiment the upper end of the first thin-walled barrel-type heat exchanger is connected to the burner;

[0036] The lower end of the water chamber of the first thin-walled barrel-type heat exchanger 43 is connected to the steam outlet pipe 7, and the upper end of the water chamber of the first thin-walled barrel-type heat exchanger 43 is connected to the upper end of the water chamber of the second thin-walled barrel-type heat exchanger 44; the lower end of the water chamber of the second thin-walled barrel-type heat exchanger 44 is connected to the lower end of the water chamber of the third thin-walled barrel-type heat exchanger 45, and the upper end of the water chamber of the third thin-walled barrel-type heat exchanger 45 is connected to the third water inlet pipe 95. Water can enter the water chamber of the third thin-walled barrel-type heat exchanger 45 through the third water inlet pipe 95. After heat exchange, the water in the first thin-walled barrel heat exchanger 44 enters its lower end through the lower end of the water chamber. After further heat exchange, the water in the second thin-walled barrel heat exchanger 44 enters its upper end through the upper end of the water chamber. After further heat exchange, the water in the first thin-walled barrel heat exchanger 43 enters its lower end through the lower end of the water chamber and is discharged through the steam outlet pipe 7. The lower end of the first flue gas chamber is connected to the lower end of the second flue gas chamber; the upper end of the second flue gas chamber is connected to the upper end of the third flue gas chamber; the flue gas in the third flue gas chamber is discharged from its lower end. By placing the inlet and outlet ends of each water chamber at both ends, the heat exchange area and efficiency are effectively improved.

[0037] Preferably, a flue pipe is provided at the lower end of the first thin-walled barrel-type heat exchanger. One end of the flue pipe is connected to the first flue gas cavity, and the other end is connected to the second flue gas cavity. The flue gas in the first flue gas cavity can be introduced into the second flue gas cavity through the flue pipe.

[0038] The upper opening of the second thin-walled barrel heat exchanger is connected to the lower end of the first thin-walled barrel heat exchanger. The upper opening of the second thin-walled barrel heat exchanger is connected to the third flue gas cavity. The flue gas in the second flue gas cavity enters the third flue gas cavity through the upper opening of the second thin-walled barrel heat exchanger.

[0039] The upper end of the third thin-walled barrel heat exchanger is connected to the upper end of the first thin-walled barrel heat exchanger. The lower end of the third thin-walled barrel heat exchanger is open, and the flue gas in the third flue gas cavity is discharged from the lower end opening of the third thin-walled barrel heat exchanger.

[0040] like Figure 2 , Figure 3As shown, the first thin-walled barrel-type heat exchanger 43 includes a second annular plate 64, a vertical inner cylinder wall 66, a conical inner cylinder wall 69, a third annular plate 70, a first annular plate 63, a vertical outer cylinder wall 65, a conical outer cylinder wall 67, a fourth annular plate 71, and a first ring plate 77. The second annular plate 64, the vertical inner cylinder wall 66, the conical inner cylinder wall 69, and the third annular plate 70 are connected in sequence to form the inner cylinder wall of the first thin-walled barrel-type heat exchanger 43. The first annular plate 63, the vertical outer cylinder wall 65, the conical outer cylinder wall 67, and the fourth annular plate 71 are connected in sequence to form the outer cylinder wall of the first thin-walled barrel-type heat exchanger 43. The first ring plate 77 is located at the upper end of the first thin-walled barrel-type heat exchanger 43. The outer cylinder wall is sleeved outside the inner cylinder wall. Both the inner cylinder wall and the outer cylinder wall are connected to the first ring plate 77. A water cavity is provided between the inner cylinder wall, the outer cylinder wall, and the first ring plate 77.

[0041] Preferably, the second ring plate 64 and the first ring plate 63 are connected to the first ring plate 77 and are located at the upper end of the first thin-walled barrel heat exchanger 43, while the conical inner cylinder wall 69 and the conical outer cylinder wall 67 are located at the lower end of the first thin-walled barrel heat exchanger 43, forming a conical water cavity.

[0042] Multiple first water inlet pipes 61 are evenly distributed on the first annular plate 63. These first water inlet pipes 61 are connected to the water cavity between the second annular plate 64 and the first annular plate 63. The first water inlet pipes 61 are connected to the second water outlet pipe 78 through the first connecting pipe 60. After the steam-water mixture has completed heat exchange in the second thin-walled barrel heat exchanger, it enters the water cavity of the first thin-walled barrel heat exchanger through the second water outlet pipe 78, the first connecting pipe 60, and the first water inlet pipe 61. The second annular plate 64, the first annular plate 63, and the upper part of the vertical inner cylinder wall 66 and the vertical outer cylinder wall 65 form an upward flow cavity, which is used to evenly distribute steam and avoid uneven steam distribution inside the first thin-walled barrel heat exchanger 43, which could cause local dry burning.

[0043] The steam outlet pipe 7 is welded to the center of the fourth ring plate 71. The steam outlet pipe 7 is connected to the water cavity of the first thin-walled barrel heat exchanger 43. The steam generated by the heat exchange of the water cavity of the first thin-walled barrel heat exchanger 43 is output to the heat exchanger through the steam outlet pipe 7.

[0044] The inner wall of the first thin-walled barrel heat exchanger 43 is the first flue gas cavity. Multiple fastening screws 62 are evenly distributed on the first ring plate 63. The burner is connected to the first ring plate 63 through the fastening screws 62, and the cylindrical burner head 42 of the burner is extended into the first flue gas cavity. The flue gas generated by the combustion of the cylindrical burner head 42 directly enters the first flue gas cavity.

[0045] In addition, a support barrel 74 is provided at the lower end of the first thin-walled barrel-type heat exchanger 43 to provide auxiliary support for the heat exchanger. The support barrel 74 is connected to the fourth annular plate 71.

[0046] The lower end of the first barrel heat exchanger 43 is also provided with four first reinforcing columns 72 to enhance the pressure resistance of the bottom cavity. One of the first reinforcing columns 72 has a hole in the center to form a water leakage hole. One end of the first reinforcing column 72 is connected to the third ring plate 70 and the other end is connected to the fourth ring plate 71. The water leakage hole is a through hole and one end is connected to the first flue gas cavity to prevent water leakage inside the first barrel heat exchanger 43 from not being discharged in time and posing a danger to the combustion of the burner.

[0047] Multiple support ribs 75 are also provided on the upper exterior of the first barrel heat exchanger 43. The support ribs 75 are connected to the upper end of the third thin-walled barrel heat exchanger 45, and the support ribs 75 provide positioning and auxiliary support for the third thin-walled barrel heat exchanger 45.

[0048] Multiple flue gas pipes 68 are provided in the conical water cavity of the first barrel heat exchanger 43. The flue gas pipes 68 are connected to both the first flue gas cavity and the second flue gas cavity. By setting the flue gas pipes 68, the internal pressure resistance of the conical cavity can be enhanced, and the high-temperature flue gas in the first flue gas cavity can be guided to the second flue gas cavity for subsequent convective heat exchange.

[0049] Preferably, the thickness of the inner and outer cylinder walls of the first barrel heat exchanger 43 is 2mm, and the gap between the inner and outer cylinder walls is 2mm. To ensure the uniformity of the gap between the inner and outer cylinder walls, this embodiment connects multiple positioning posts 76 between the inner and outer cylinder walls, and the multiple positioning posts 76 are evenly distributed between the inner and outer cylinder walls.

[0050] Specifically, the inner and outer walls of the first barrel heat exchanger 43 are provided with a series of holes, and the holes on the inner and outer walls correspond to each other. A corresponding number of positioning pins 76 are installed in the holes for connection, such as... Figure 8 As shown, the step b in the positioning column 76 has a height of 2mm, forming a transition fit with the 2mm gap between the inner and outer cylinder walls, supporting the inner and outer cylinder walls and ensuring uniform gaps around them. The platform a of the positioning column 76 is embedded in the hole of the outer cylinder wall 65, acting as a welded part and welded to the outer cylinder wall. The platform a has a height of only 0.5mm. Similarly, the platform c is embedded in the hole of the inner cylinder wall 66 and welded to it. The positioning column 76 serves four purposes: first, to ensure uniform gaps between the inner and outer cylinder walls, avoiding turbulent steam flow and preventing localized dry burning; second, to enhance the pressure resistance of the first thin-walled barrel heat exchanger, achieving a pressure resistance of 2.5MPa with a 2mm thick cylinder wall; third, to create a flow effect around the steam and water vapor mixture, enhancing heat exchange intensity; and fourth, to increase the heat exchange area through the positioning column.

[0051] This embodiment can adjust the flow area of ​​the water cavity between the inner and outer cylinder walls by setting the diameters of the inner and outer cylinder walls, ensuring that the steam flow rate is reasonable and avoiding the generation of high-pressure groups. At the same time, this setting greatly increases the heat exchange area of ​​the heat exchanger while controlling the water volume. Both the inner and outer cylinder walls of this thin-walled barrel heat exchanger can conduct corresponding radiation or convection heat exchange with the flue gas or flame, which effectively improves the heat exchange intensity of the heat exchanger, thereby achieving a small volume and a large heat exchange intensity. Under the limitation of less than 30L volume, the amount of steam generated is much greater than that of heat exchangers with other structures.

[0052] like Figure 4 , Figure 5 As shown, the second thin-walled barrel heat exchanger 44 includes a fifth ring plate 79, a second ring plate 80, a sixth ring plate 81, a vertical inner cylinder wall 83, a vertical outer cylinder wall 82, a seventh ring plate 84, an eighth ring plate 85, and a third ring plate 88. The fifth ring plate 79, the second ring plate 80, and the sixth ring plate 81 are located at the upper end of the second thin-walled barrel heat exchanger 44, and the seventh ring plate 84, the eighth ring plate 85, and the third ring plate 88 are located at the lower end of the second thin-walled barrel heat exchanger 44. The fifth ring plate 79, the vertical inner cylinder wall 83, and the seventh ring plate 84... The inner cylinder wall of the second thin-walled barrel heat exchanger 44 is formed by sequentially connecting the sixth ring plate 81, the vertical outer cylinder wall 82, and the eighth ring plate 85. The outer cylinder wall of the second thin-walled barrel heat exchanger 44 is formed by sequentially connecting the fifth ring plate 79 and the sixth ring plate 81. The eighth ring plate 85 and the seventh ring plate 84 are also connected to the third ring plate 88. A water cavity of the second thin-walled barrel heat exchanger 44 is formed between the second ring plate 80, the third ring plate 88, and the inner and outer cylinder walls of the second thin-walled barrel heat exchanger 44. A second flue gas cavity is formed between the inner cylinder wall of the second thin-walled barrel heat exchanger 44 and the outer cylinder wall of the first thin-walled barrel heat exchanger 43.

[0053] The fifth ring plate 79, the sixth ring plate 81, the second ring plate 80, and the upper part of the vertical inner cylinder wall 83 and the vertical outer cylinder wall 82 form the upper flow cavity of the second thin-walled barrel heat exchanger. This cavity is used to evenly distribute steam and avoid uneven steam distribution in the first heat exchanger, which could lead to localized dry burning. Several second water outlet pipes 78 are evenly distributed on the fifth ring plate 79. These second water outlet pipes 78 are connected to the first water inlet pipe 61 via the first connecting pipe 60. After the steam-water mixture has completed heat exchange in the second thin-walled barrel heat exchanger, it enters the first thin-walled barrel heat exchanger through this pipe. The lower parts of the vertical inner cylinder wall 83 and the vertical outer cylinder wall 82 are welded to the eighth ring plate 85, the seventh ring plate 84 and the third ring plate 88 to form the lower flow cavity of the second thin-walled barrel heat exchanger. The second water inlet pipe 87 is arranged below the lower flow cavity. The second water inlet pipe 87 is connected to the third water outlet pipe 101 through the second connecting pipe 57. The lower flow cavity has the same principle and function as the upper flow cavity, which is also used to evenly distribute steam and avoid uneven steam distribution in the second and third thin-walled barrel heat exchangers, which may cause local dry burning.

[0054] Preferably, the second water inlet pipe 87 is connected to the eighth ring plate 85.

[0055] The lower end of the second thin-walled barrel heat exchanger 44 is also provided with four second reinforcing columns 86 to enhance the pressure resistance of the bottom cavity. One of the second reinforcing columns 86 has a hole in the center to form a water leakage hole. One end of the second reinforcing column 86 is connected to the seventh ring plate 84, and the other end is connected to the eighth ring plate 85. The water leakage hole is a through hole, and one end is connected to the second flue gas cavity to prevent water leakage inside the second thin-walled barrel heat exchanger 44 from not being discharged in time and posing a danger to the combustion of the burner.

[0056] The second outlet pipe 78 is connected to the fifth ring plate 79 and is connected to the water cavity of the second thin-walled barrel heat exchanger 44. The second outlet pipe 78 is connected to the first inlet pipe 61 through the first connecting pipe 60.

[0057] The inner and outer walls of the second thin-walled barrel heat exchanger 44 are both 2mm thick, and the gap between them is also 2mm. To ensure the uniformity of the gap, this embodiment connects multiple positioning posts 76 between the inner and outer walls of the second thin-walled barrel heat exchanger 44. These positioning posts 76 are evenly distributed between the inner and outer walls. The connection method between the positioning posts 76 and the second thin-walled barrel heat exchanger 44 is the same as the connection method between the positioning posts 76 and the first barrel heat exchanger 43.

[0058] like Figure 6 , Figure 7As shown, the third thin-walled barrel heat exchanger 45 includes a ninth ring plate 91, a tenth ring plate 92, a vertical inner cylinder wall 94, a vertical outer cylinder wall 93, an eleventh ring plate 98, a fifth ring plate 99, a twelfth ring plate 100, a thirteenth ring plate 102, a fourth ring plate 89, a sixth ring plate 103, a third outlet pipe 101, and a third inlet pipe 95; the tenth ring plate 92, the vertical inner cylinder wall 94, and the twelfth ring plate 100 are connected to form the third thin-walled barrel heat exchanger. The inner wall of the barrel heat exchanger 45, the ninth ring plate 91, the vertical outer wall 93, the fifth ring plate 99, and the twelfth ring plate 100 are connected to form the outer wall of the third thin-walled barrel heat exchanger 45. A water cavity is formed between the inner and outer walls of the third thin-walled barrel heat exchanger 45. A third flue gas cavity is formed between the inner wall of the third thin-walled barrel heat exchanger 45 and the outer wall of the second thin-walled barrel heat exchanger 44. The ninth ring plate 91 and the tenth ring plate 92 are both connected to the fourth ring plate 89, and the vertical inner wall 94 is also connected to the sixth ring plate 103.

[0059] The fourth ring plate 89 is connected to the supporting stiffener 75, and the sixth ring plate 103 forms the lower opening of the third thin-walled barrel heat exchanger 45, and the third flue gas cavity is connected to the lower opening.

[0060] The ninth ring plate 91, the tenth ring plate 92, the fourth ring plate 89, and the upper parts of the vertical inner cylinder wall 94 and the vertical outer cylinder wall 93 are welded together to form the upper flow cavity of the third thin-walled barrel heat exchanger. This cavity is used to evenly distribute steam and avoid uneven steam distribution within the third thin-walled barrel heat exchanger, which could lead to localized dry burning. Several third water inlet pipes 95 are evenly distributed below the tenth ring plate 92. These third water inlet pipes 95 are connected to the water chamber of the third thin-walled barrel heat exchanger 45, allowing the steam-water mixture to enter the third thin-walled barrel heat exchanger through the third water inlet pipes 95. The lower part of the vertical inner cylinder wall 94 and the vertical outer cylinder wall 93 are welded to the eleventh ring plate 98, the twelfth ring plate 100 and the fifth ring plate 99 to form the lower flow cavity of the third thin-walled barrel heat exchanger. The lower part of the lower flow cavity is connected to the third water outlet pipe 101. The lower flow cavity has the same principle and function as the upper flow cavity, which is also used to evenly distribute steam and avoid uneven steam distribution in the second and third heat exchangers, which may cause local dry burning.

[0061] In addition, the upper end of the third thin-walled barrel heat exchanger 45 is provided with multiple reinforcing tubes 90. One end of the reinforcing tube 90 is connected to the ninth ring plate 91, and the other end is connected to the tenth ring plate 92 to enhance the pressure resistance of the upper flow cavity. A through hole is provided in the middle of each reinforcing tube 90, and the second water outlet pipe 78 passes through the through hole and is connected to the first water inlet pipe 61.

[0062] The inner and outer walls of the third thin-walled barrel heat exchanger 45 are both 2mm thick, and the gap between them is also 2mm. To ensure the uniformity of the gap, this embodiment connects multiple positioning posts 76 between the inner and outer walls of the third thin-walled barrel heat exchanger 45. These positioning posts 76 are evenly distributed between the inner and outer walls. The connection method between the positioning posts 76 and the third thin-walled barrel heat exchanger 45 is the same as the connection method between the positioning posts 76 and the first barrel heat exchanger 43.

[0063] In addition, multiple studs 97 are provided on the eleventh ring plate 98 for connecting the heat exchanger disclosed in this embodiment to other parts.

[0064] In this embodiment, a heat exchanger operates by generating a short flame on the outer surface of the cylindrical burner head 42, providing high-temperature flue gas for heat exchange. This flue gas radiates heat onto the inner wall of the first thin-walled barrel heat exchanger 43. The high-temperature flue gas generated after combustion flows rapidly through four flue pipes 68 into the second flue gas cavity, where it flows rapidly from bottom to top, scouring the outer wall of the first thin-walled barrel heat exchanger and the inner wall of the second thin-walled barrel heat exchanger, generating strong convective heat exchange. The flue gas then enters the third flue gas cavity through the top of the second thin-walled barrel heat exchanger, flowing rapidly from top to bottom, scouring the outer wall of the second thin-walled barrel heat exchanger and the inner wall of the third thin-walled barrel heat exchanger, generating strong convective heat exchange. The flue gas is then discharged from the bottom of the third thin-walled barrel heat exchanger. Water enters the water cavity of the third thin-walled barrel heat exchanger 45 through the third water inlet pipe 58, exchanging heat with the flue gas in the third flue gas cavity. With a wall thickness of only 2mm, the heat exchange intensity between flue gas and water is significantly enhanced. Furthermore, the positioning columns in the thin-walled structure strengthen the turbulence effect, making the process of water absorbing heat and converting it into steam more efficient and uniform. Similarly, after heat exchange in the water chamber of the third thin-walled barrel heat exchanger 45, the water enters the water chamber of the second thin-walled barrel heat exchanger 44, where it exchanges heat with the flue gas in both the third and second flue gas chambers, increasing the heat exchange area and efficiency. After heat exchange in the water chamber of the second thin-walled barrel heat exchanger 44, the water enters the water chamber of the first thin-walled barrel heat exchanger 43, where it exchanges heat with the flue gas in both the second and first flue gas chambers. Through convection, radiation, and other heat exchange methods, high-quality steam is finally obtained, and the steam is ultimately discharged through the steam outlet pipe 7, completing the overall heat exchange process.

[0065] In summary, the key feature of this embodiment is that, through the first thin-walled barrel heat exchanger 43, the second thin-walled barrel heat exchanger 44, and the third thin-walled barrel heat exchanger 45, and their related structural configurations, it effectively achieves higher heat exchange efficiency within a small volume. All piping is internal and can serve as heat exchange structures, maximizing the participation of all volume-consuming structures in heat exchange. This reduces heat loss and improves the overall thermal efficiency of the unit.

[0066] Example 2

[0067] In this embodiment, a heat exchange method for a heat exchanger disclosed in Embodiment 1 is disclosed, comprising:

[0068] Water in the third inlet pipe passes sequentially through the water chambers of the third thin-walled barrel heat exchanger, the second thin-walled barrel heat exchanger, and the first thin-walled barrel heat exchanger.

[0069] The burner is controlled to burn, and the flue gas generated by the combustion enters the first flue gas cavity, the second flue gas cavity and the third flue gas cavity in sequence to exchange heat with the water in the water cavity of the first thin-walled barrel heat exchanger, the second thin-walled barrel heat exchanger and the third thin-walled barrel heat exchanger.

[0070] After the water in the water chamber of the first thin-walled barrel-type heat exchanger exchanges heat with the flue gas in the first and second flue gas chambers, steam is formed and discharged from the steam outlet pipe.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A heat exchanger, characterized in that, It includes a first thin-walled barrel-type heat exchanger, a second thin-walled barrel-type heat exchanger, and a third thin-walled barrel-type heat exchanger; the water chambers of the first thin-walled barrel-type heat exchanger, the second thin-walled barrel-type heat exchanger, and the third thin-walled barrel-type heat exchanger are sequentially connected; the water chamber of the first thin-walled barrel-type heat exchanger is connected to the steam outlet pipe, and the water chamber of the third thin-walled barrel-type heat exchanger is connected to the third water inlet pipe; water in the third water inlet pipe can pass through the three water chambers and then be discharged through the steam outlet pipe; the inner cavity of the first thin-walled barrel-type heat exchanger is the first flue gas cavity, and the second thin-walled barrel-type heat exchanger is fitted inside... A first thin-walled barrel-type heat exchanger is located outside the second thin-walled barrel-type heat exchanger, with a second flue gas cavity between them; a third thin-walled barrel-type heat exchanger is fitted outside the second thin-walled barrel-type heat exchanger, with a third flue gas cavity between them; the first flue gas cavity, the second flue gas cavity, and the third flue gas cavity are connected in sequence; the first flue gas cavity is connected to the burner; the flue gas generated by the burner can enter the first flue gas cavity, the second flue gas cavity, and the third flue gas cavity to exchange heat with the water in the water cavity of the first thin-walled barrel-type heat exchanger, the second thin-walled barrel-type heat exchanger, and the third thin-walled barrel-type heat exchanger; The inner and outer walls of the first, second, and third thin-walled barrel heat exchangers are 2mm thick, and the gap between the inner and outer walls is 2mm. Multiple positioning posts are connected between the inner and outer walls of the first, second, and third thin-walled barrel heat exchangers. The multiple positioning posts are evenly distributed between the inner and outer walls. Reinforcing columns are respectively installed at the lower ends of the first thin-walled barrel heat exchanger and the lower ends of the second thin-walled barrel heat exchanger. One end of the reinforcing column is connected to the inner wall of the heat exchanger itself, and the other end is connected to the outer wall of the heat exchanger itself. A water leakage hole is also provided on the reinforcing column. The upper end of the first thin-walled barrel-type heat exchanger is connected to the burner; The lower end of the water chamber of the first thin-walled barrel heat exchanger is connected to the steam outlet pipe, and the upper end of the water chamber of the first thin-walled barrel heat exchanger is connected to the upper end of the water chamber of the second thin-walled barrel heat exchanger; the lower end of the water chamber of the second thin-walled barrel heat exchanger is connected to the lower end of the water chamber of the third thin-walled barrel heat exchanger, and the upper end of the water chamber of the third thin-walled barrel heat exchanger is connected to the third water inlet pipe. The lower end of the first flue gas cavity is connected to the lower end of the second flue gas cavity; the upper end of the second flue gas cavity is connected to the upper end of the third flue gas cavity; the flue gas in the third flue gas cavity is discharged from the lower end of the third flue gas cavity.

2. A heat exchanger as described in claim 1, characterized in that, The first, second, and third thin-walled barrel-type heat exchangers all include an inner cylinder wall and an outer cylinder wall, with a water cavity for containing water provided between the inner and outer cylinder walls; the interior of the inner cylinder wall of the first thin-walled barrel-type heat exchanger is a first flue gas cavity; the space between the outer cylinder wall of the first thin-walled barrel-type heat exchanger and the inner cylinder wall of the second thin-walled barrel-type heat exchanger is a second flue gas cavity; and the space between the inner cylinder wall of the third thin-walled barrel-type heat exchanger and the outer cylinder wall of the second thin-walled barrel-type heat exchanger is a third flue gas cavity.

3. A heat exchanger as described in claim 1, characterized in that, The lower end of the first thin-walled barrel-type heat exchanger is provided with a flue pipe. One end of the flue pipe is connected to the first flue gas cavity, and the other end is connected to the second flue gas cavity. The flue gas in the first flue gas cavity can be introduced into the second flue gas cavity through the flue pipe.

4. A heat exchanger as described in claim 1, characterized in that, The upper opening of the second thin-walled barrel heat exchanger is connected to the lower end of the first thin-walled barrel heat exchanger. The upper opening of the second thin-walled barrel heat exchanger is connected to the third flue gas cavity. The flue gas in the second flue gas cavity enters the third flue gas cavity through the upper opening of the second thin-walled barrel heat exchanger.

5. A heat exchanger as described in claim 1, characterized in that, The upper end of the third thin-walled barrel heat exchanger is connected to the upper end of the first thin-walled barrel heat exchanger. The lower end of the third thin-walled barrel heat exchanger is open, and the flue gas in the third flue gas cavity is discharged from the lower end opening of the third thin-walled barrel heat exchanger.

6. A heat exchange method for a heat exchanger as described in any one of claims 1-5, comprising: Water in the third inlet pipe passes sequentially through the water chambers of the third thin-walled barrel heat exchanger, the second thin-walled barrel heat exchanger, and the first thin-walled barrel heat exchanger. The burner is controlled to burn, and the flue gas generated by the combustion enters the first flue gas cavity, the second flue gas cavity and the third flue gas cavity in sequence to exchange heat with the water in the water cavity of the first thin-walled barrel heat exchanger, the second thin-walled barrel heat exchanger and the third thin-walled barrel heat exchanger. After the water in the water chamber of the first thin-walled barrel-type heat exchanger exchanges heat with the flue gas in the first and second flue gas chambers, steam is formed and discharged from the steam outlet pipe.

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