Heat exchanger for waste heat recovery

Abstract

A heat exchanger for waste heat recovery comprises a smoke leading-in heat exchange shell, and a water preheating shell is arranged in the smoke leading-in heat exchange shell. A flue gas guiding-in channel is arranged at the bottom of the flue gas guiding-in heat exchange shell, a flue gas collecting cavity is formed in the bottom of the water preheating shell, a flue gas guiding-out pipeline is arranged on one side of the flue gas collecting cavity, and a plurality of flue gas auxiliary pipelines are arranged in the water preheating shell. And after smoke is guided in, heat exchange of the preheating air pipeline on the outer side and heating of the water preheating shell on the inner side can be completed, then sufficient heat exchange is conducted through the smoke auxiliary pipeline, then the smoke is exhausted through the smoke collecting cavity, and it is guaranteed that the temperature of the internal smoke can be reduced as much as possible.

Description

Technical Field

[0001] This application relates to a heat exchanger for waste heat recovery. Background Technology

[0002] After fuel combustion in a boiler, chemical energy is typically converted into thermal energy through heat exchange, which is then used for subsequent power generation and energy supply. To improve the overall energy utilization rate, the waste heat also needs to be recovered. Currently, waste heat recovery generally uses waste heat exchangers to preheat water or air, but the energy recovery efficiency of current waste heat recovery devices is relatively low, and the heat from the flue gas cannot be fully utilized in a cascade manner. Utility Model Content

[0003] To address the aforementioned problems, this application proposes a heat exchanger for waste heat recovery, comprising a flue gas inlet heat exchange shell, and a water preheating shell disposed inside the flue gas inlet heat exchange shell; a flue gas inlet channel is disposed at the bottom of the flue gas inlet heat exchange shell, and a flue gas collecting cavity is disposed at the bottom of the water preheating shell; a flue gas outlet pipe is disposed on one side of the flue gas collecting cavity; several flue gas auxiliary pipes are disposed inside the water preheating shell, one end of each auxiliary pipe being connected to the flue gas collecting cavity and the other end being connected to the inside of the flue gas inlet heat exchange shell; preheated water inlet pipes and preheated water outlet pipes are respectively disposed on the upper and lower sides of the water preheating shell; and a preheated air pipe is disposed on the outer side of the flue gas inlet heat exchange shell. This application employs a water preheating shell disposed inside the flue gas heat exchange shell, enabling the flue gas to complete heat exchange with the outer preheated air pipe and the inner water preheating shell after inlet, and then, after sufficient heat exchange through the auxiliary pipes, to be discharged through the flue gas collecting cavity, ensuring that the internal flue gas temperature is reduced as much as possible.

[0004] Preferably, the flue gas auxiliary duct is provided with annular ribs.

[0005] Preferably, the preheated air duct is set up with an upper inlet and a lower outlet.

[0006] Preferably, a number of spaced-apart inner side baffles are provided on the inner wall of the water preheating shell.

[0007] Preferably, the inner baffle is arranged obliquely downwards. The inner baffle used in this application turbulents the water flow inside, thereby minimizing dust accumulation and ensuring heat exchange efficiency.

[0008] Preferably, the distribution density of the flue gas auxiliary duct is set in such a way that the distribution density gradually decreases from the center to the outside.

[0009] Preferably, the preheated air duct is a square pipe.

[0010] Preferably, a transverse guide rod is provided inside the preheated air duct, and the end of the transverse guide rod is fixedly connected to the inner wall of the preheated air duct through a fixing part. A spiral guide plate is provided on the transverse guide rod.

[0011] Preferably, the fixing part includes an annular snap-fit ​​plate with a plurality of snap-fit ​​protrusions on the annular snap-fit ​​plate, a snap-fit ​​protrusion groove on each snap-fit ​​protrusion, and a snap-fit ​​protrusion block that mates with the snap-fit ​​protrusion groove on the preheating air duct. The transverse baffle and guide spiral plate used in this application can create an internal airflow vortex effect, thereby accelerating air turbulence and enhancing its heat exchange efficiency.

[0012] This application can bring the following beneficial effects:

[0013] 1. This application adopts a method of setting a water preheating shell inside the flue gas heat exchange shell, so that after the flue gas is introduced, it can complete the heat exchange of the preheated air pipe on the outside and the heating of the water preheating shell on the inside. After sufficient heat exchange through the flue gas auxiliary pipe, it is discharged through the flue gas collection cavity, ensuring that the internal flue gas temperature can be reduced as much as possible.

[0014] 2. The inner baffle used in this application turbulents the internal water flow, thereby minimizing the accumulation of internal dust and ensuring heat exchange efficiency.

[0015] 3. The transverse baffle and guide spiral plate used in this application can create an internal airflow vortex effect, thereby accelerating air turbulence and enhancing its heat exchange efficiency. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of this application.

[0018] Figure 2 This is a top view of the structure of this application.

[0019] Figure 3 This is a structural schematic diagram of the transverse guide rod section. Detailed Implementation

[0020] To clearly illustrate the technical features of this solution, the following detailed description, in conjunction with the accompanying drawings, will be provided.

[0021] In the first embodiment, such as Figure 1As shown, a heat exchanger for waste heat recovery includes a flue gas inlet heat exchange shell 1, and a water preheating shell 2 disposed inside the flue gas inlet heat exchange shell 1; a flue gas inlet channel 3 is disposed at the bottom of the flue gas inlet heat exchange shell 1, a flue gas collecting cavity 4 is disposed at the bottom of the water preheating shell 2, a flue gas outlet pipe 5 is disposed on one side of the flue gas collecting cavity 4, and a plurality of flue gas auxiliary pipes 6 are disposed inside the water preheating shell 2, one end of the flue gas auxiliary pipes 6 being connected to the flue gas collecting cavity 4 and the other end being connected to the flue gas inlet heat exchange shell 1; a preheated water inlet pipe 7 and a preheated water outlet pipe 8 are respectively disposed on the upper and lower sides of the water preheating shell 2; and a preheated air pipe 9 is disposed on the outer side of the flue gas inlet heat exchange shell 1.

[0022] In use, flue gas is introduced from flue gas inlet channel 3 into the space between flue gas inlet heat exchange shell 1 and water preheating shell 2, and then discharged from flue gas auxiliary pipe 6 into flue gas collection cavity 4, and finally discharged from flue gas outlet pipe 5; for air, it is introduced and discharged from preheated air pipe 9, thus completing the air preheating; while water is introduced from preheated water inlet pipe 7, and after heat exchange in water preheating shell 2, it is discharged from preheated water outlet pipe 8, thus completing the water preheating.

[0023] In the second embodiment, as Figure 1-3 As shown, a heat exchanger for waste heat recovery includes a flue gas inlet heat exchange shell 1, and a water preheating shell 2 disposed inside the flue gas inlet heat exchange shell 1; a flue gas inlet channel 3 is disposed at the bottom of the flue gas inlet heat exchange shell 1, a flue gas collecting cavity 4 is disposed at the bottom of the water preheating shell 2, a flue gas outlet pipe 5 is disposed on one side of the flue gas collecting cavity 4, and a plurality of flue gas auxiliary pipes 6 are disposed inside the water preheating shell 2, one end of the flue gas auxiliary pipes 6 being connected to the flue gas collecting cavity 4 and the other end being connected to the flue gas inlet heat exchange shell 1; a preheated water inlet pipe 7 and a preheated water outlet pipe 8 are respectively disposed on the upper and lower sides of the water preheating shell 2; and a preheated air pipe 9 is disposed on the outer side of the flue gas inlet heat exchange shell 1.

[0024] The flue gas auxiliary duct 6 is provided with annular ribs 10. The preheated air duct 9 is designed with an upper inlet and a lower outlet.

[0025] A plurality of spaced-apart inner side baffles 11 are provided on the inner wall of the water preheating shell 2. The inner side baffles 11 are arranged obliquely downward. The distribution density of the flue gas auxiliary pipe 6 is arranged in a manner that gradually decreases from the center to the outside.

[0026] The preheated air duct 9 is a square pipe. A transverse guide rod 12 is installed inside the preheated air duct 9. The end of the transverse guide rod 12 is fixedly connected to the inner wall of the preheated air duct 9 via a fixing part. A spirally arranged guide spiral plate 13 is provided on the transverse guide rod 12. The fixing part includes an annular snap-fit ​​plate 14, on which several snap-fit ​​protrusions 15 are provided. A snap-fit ​​protrusion groove 16 is provided on each snap-fit ​​protrusion 15. A snap-fit ​​protrusion block 17 that mates with the snap-fit ​​protrusion groove 16 is provided on the preheated air duct 9.

[0027] In use, flue gas is introduced from the flue gas inlet channel 3 into the space between the flue gas inlet heat exchange shell 1 and the water preheating shell 2, and then discharged from the flue gas auxiliary pipe 6 into the flue gas collection cavity 4, and finally discharged from the flue gas outlet pipe 5. For air, it is guided by the guide spiral plate 13, and then introduced and discharged through the preheated air pipe 9, thus completing the air preheating. Water is introduced from the preheated water inlet pipe 7, turbulent by the inner baffle 11, and then discharged from the preheated water outlet pipe 8 after heat exchange in the water preheating shell 2, thus completing the water preheating.

[0028] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A heat exchanger for waste heat recovery, characterized in that: The device includes a flue gas inlet heat exchange shell, inside which a water preheating shell is disposed; a flue gas inlet channel is disposed at the bottom of the flue gas inlet heat exchange shell, a flue gas collecting cavity is disposed at the bottom of the water preheating shell, a flue gas outlet pipe is disposed on one side of the flue gas collecting cavity, and a plurality of flue gas auxiliary pipes are disposed inside the water preheating shell, one end of each flue gas auxiliary pipe being connected to the flue gas collecting cavity and the other end being connected to the flue gas inlet heat exchange shell; preheated water inlet pipes and preheated water outlet pipes are disposed on the upper and lower sides of the water preheating shell, respectively; and a preheated air pipe is disposed on the outer side of the flue gas inlet heat exchange shell.

2. The heat exchanger for waste heat recovery as described in claim 1, characterized in that: The flue gas auxiliary duct is equipped with annular ribs.

3. A heat exchanger for waste heat recovery as described in claim 1, characterized in that: The preheated air duct is designed with an upper intake and a lower outlet.

4. A heat exchanger for waste heat recovery as described in claim 1, characterized in that: Several spaced-apart inner side baffles are provided on the inner wall of the water preheating shell.

5. A heat exchanger for waste heat recovery as described in claim 4, characterized in that: The inner side baffle is set diagonally downward.

6. A heat exchanger for waste heat recovery as described in claim 1, characterized in that: The distribution density of the flue gas auxiliary duct is set in a manner that gradually decreases from the center to the outside.

7. A heat exchanger for waste heat recovery as described in claim 1, characterized in that: The preheated air duct is a square pipe.

8. A heat exchanger for waste heat recovery as described in claim 7, characterized in that: A transverse guide rod is installed inside the preheated air duct. The end of the transverse guide rod is fixedly connected to the inner wall of the preheated air duct through a fixing part. A spiral guide plate is installed on the transverse guide rod.

9. A heat exchanger for waste heat recovery as described in claim 8, characterized in that: The fixing part includes an annular snap-fit ​​plate, on which a plurality of snap-fit ​​protrusions are provided, and a snap-fit ​​protrusion groove is provided on the snap-fit ​​protrusions. A snap-fit ​​protrusion block that cooperates with the snap-fit ​​protrusion groove is provided on the preheating air duct.

Images