A waste heat recovery mechanism for denitrification of internal combustion engine exhaust gas

Abstract

This utility model discloses a waste heat recovery mechanism for denitrification of internal combustion engine exhaust gas, including a bottom support, a heat exchange box mounted on the bottom support, and a heat exchange unit. A partition is installed inside the heat exchange box, dividing the heat exchange box into three chambers. This waste heat recovery mechanism for denitrification of internal combustion engine exhaust gas achieves uniform gas-water flow, avoiding localized failures. The gas delivery component uses a porous gas distribution structure to evenly distribute the exhaust gas to a first gas distributor, and then disperses the flow through capillary tubes, avoiding heat exchange dead zones caused by excessively high exhaust gas flow rates in certain areas. The connecting water pipes at the top of each chamber are independently branched, ensuring that the hot water pipes of each heat exchange unit receive water evenly, preventing localized overheating or insufficient heat exchange due to uneven water flow. This avoids accelerated aging of components such as heat exchange tubes and seals due to localized overheating, and also avoids shortening the equipment's service life and increasing maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas denitrification technology, specifically a waste heat recovery mechanism for exhaust gas denitrification of internal combustion engines. Background Technology

[0002] In transportation and other fields, internal combustion engines, as core power units, continuously emit high-temperature exhaust gases containing nitrogen oxides during operation. Direct emission of these exhaust gases would significantly exacerbate air pollution, especially in intensive work environments, potentially causing regional environmental problems. Furthermore, the large amount of heat energy contained in the exhaust gases is not effectively recovered and is directly lost with the treated gases, resulting in energy waste and failing to meet the current industrial development needs for energy conservation and carbon reduction.

[0003] Currently available internal combustion engine exhaust gas treatment equipment, while possessing waste heat recovery capabilities, employs a low-tech co-current heat exchange structure—cold water and exhaust gas flow in the same direction, creating an effective temperature difference only in the initial contact phase. As the temperatures gradually converge, the subsequent heat exchange efficiency rapidly declines, failing to meet the actual heating needs of industrial production or domestic use. Furthermore, existing equipment often uses a single-path duct for direct exhaust gas delivery, lacking an effective gas distribution and buffer structure. This easily leads to excessively high local flow rates and uneven distribution of exhaust gas within the chamber, creating significant heat exchange dead zones on the heat exchange tube surface. This can accelerate the aging of components such as heat exchange tubes and seals due to localized overheating. On the other hand, the cold water supply relies on a single branch pipeline to supply water to each heat exchange unit. If the pipeline experiences blockages or flow fluctuations, it can directly cause water shortages in some heat exchange units. This can result in a sharp drop in localized heat exchange efficiency or, in severe cases, damage to the heat exchange tubes due to dry burning, significantly shortening the equipment's lifespan and increasing maintenance costs.

[0004] Therefore, this utility model provides a waste heat recovery mechanism for denitrification of internal combustion engine exhaust gas to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a waste heat recovery mechanism for denitrification of internal combustion engine exhaust gas, thus solving the aforementioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a waste heat recovery mechanism for denitrification of internal combustion engine exhaust gas, comprising a bottom support, a heat exchange box mounted on the bottom support, and a heat exchange unit. The heat exchange box is equipped with a partition, which divides the heat exchange box into three chambers to achieve multi-stage heat exchange—allowing the exhaust gas to pass through the heat exchange units of each chamber sequentially from bottom to top, while cold water circulates from top to bottom, extending the contact time between the exhaust gas and the cold water, and avoiding waste heat caused by single-stage heat exchange. The heat exchange unit is located within the chamber.

[0007] The heat exchange unit includes a first gas distributor and a water connection pipe. The first gas distributor receives the exhaust gas from the gas delivery assembly. Its core function is to evenly distribute the exhaust gas, dispersing the concentrated exhaust gas into multiple capillary tubes on the spiral disc, avoiding uneven heat exchange caused by localized exhaust gas accumulation, and ensuring that each capillary tube can participate in heat exchange. A heat exchange protection pipe is fixedly connected to the outside of the first gas distributor. The heat exchange protection pipe is a metal-ceramic fiber composite pipe, with an outer stainless steel pipe and an inner ceramic fiber insulation layer. The outer stainless steel pipe can resist corrosion from acidic substances in the exhaust gas, while the inner ceramic fiber can buffer high-temperature impact, reduce the heat loss of the high-temperature exhaust gas in the capillary tubes to the outside of the heat exchange box, reduce heat loss, and protect the internal pipes from high-temperature damage. A first inner pipe and a second inner pipe are provided inside the heat exchange protection pipe, which together constitute the cooling water in the heat exchange unit. The internal inlet and outlet channels—the first internal pipe is used to introduce cold water into the hot water exchange pipe, and the second internal pipe is used to export the heated hot water in the hot water exchange pipe to the water connection pipe, forming a cold water circulation path in a single chamber; a spiral disk is provided on the lower side of the first gas distributor. The spiral disk is made of copper alloy. On the one hand, it is used to fix the capillary tube, and on the other hand, its spiral structure can extend the flow path of cold water in the hot water exchange pipe, allowing the cold water to absorb the heat of the exhaust gas more time; a capillary tube, also made of copper alloy, runs through the spiral disk and connects the first gas distributor and the gas connection pipe. When the exhaust gas flows through the capillary tube, its small diameter increases the contact area with the spiral disk and the hot water exchange pipe, while the copper material accelerates the transfer of heat from the exhaust gas to the cold water, improving the heat exchange efficiency. The first gas distributor is located at both ends of the capillary tube.

[0008] Preferably, a hot water exchange pipe is fixedly connected to the outside of the spiral disc. The hot water exchange pipe is made of copper alloy, surrounds the outside of the spiral disc, and cold water flows inside. The high thermal conductivity of copper quickly absorbs the heat of the exhaust gas transferred by the capillary tube, thus heating the cold water. A heat exchange drain pipe is connected to the bottom of the outside of the hot water exchange pipe. The heat exchange drain pipe is used to connect the bottom of the hot water exchange pipe to the second inner pipe and is the outlet channel for the heated hot water in a single chamber. It can transport the hot water to the water connection pipe and enter the next chamber for further heat exchange. The heat exchange drain pipe is connected to the second inner pipe. The first inner pipe is connected to the upper side of the hot water exchange pipe. A gas connection pipe is connected to the bottom of the capillary tube. The gas connection pipe is used to connect the first gas distributor of the adjacent chamber, realizing multi-stage flow of exhaust gas from bottom to top, ensuring that the exhaust gas can fully release heat in each chamber.

[0009] Preferably, the gas connecting pipe is disposed between the two chambers, and the water connecting pipe is disposed between the two chambers. The upper side of the water connecting pipe is connected to the heat exchange drain pipe in the upper chamber, and the lower side of the water connecting pipe is connected to the first inner pipe in the lower chamber. This enables the cold water to circulate in a reverse direction from top to bottom, opposite to the flow direction of the exhaust gas, forming countercurrent heat exchange and further improving the heat recovery efficiency.

[0010] Preferably, the heat exchange box is connected to a first water pipe, the end of which is connected to a water pump, serving as a cold water replenishment channel. When the water volume is insufficient during water circulation, the water pump replenishes cold water to the system, ensuring continuous heat exchange. A connecting water pipe is fixedly connected to the top of the chamber, connecting to an external water pipe. The external water pipe connects to the water pump and the connecting water pipe, together forming the cold water inlet path, evenly distributing the cold water delivered by the water pump to the hot water pipes of each chamber. The top of the heat exchange box is connected to a first exhaust pipe, serving as the outlet for exhaust gas after passing through multiple heat exchange stages. The channel allows cooled exhaust gas to be transported to subsequent denitrification equipment, preventing high-temperature exhaust gas from directly entering the denitrification equipment and affecting catalyst activity. A first gas pipe is connected to the side of the bottom chamber of the heat exchanger, and an air pump is connected to the end of the first gas pipe furthest from the heat exchanger, serving as the exhaust gas inlet channel. The air pump provides power to stably transport the internal combustion engine exhaust gas to the bottom chamber of the heat exchanger. An air delivery assembly is installed inside the bottom chamber of the heat exchanger, connected to the first gas pipe. This assembly stabilizes the exhaust gas pressure and evenly distributes it to the first gas distributor, preventing uneven exhaust gas delivery caused by air pump pressure fluctuations.

[0011] Preferably, the gas delivery component is connected to the first gas pipe, and the bottom chamber of the heat exchange box is provided with a first drain pipe. The first drain pipe is used to connect the heat exchange drain pipe of the bottom chamber to the heat recovery box, and is the delivery channel for the hot water after final heating. The hot water that absorbs the waste heat of the exhaust gas can be introduced into the heat recovery box for storage and secondary utilization. The first drain pipe is connected to the heat exchange drain pipe of the bottom chamber of the heat exchange box and is connected to the heat recovery box. The heat recovery box is provided with a second partition. The second partition is used to divide the heat recovery box into a water storage chamber, so that the heat recovery box becomes a space for the storage and conversion of waste heat. It not only stores the hot water introduced from the first drain pipe, but also provides space for the hot water to be further heated and vaporized, avoiding the waste of waste heat caused by the direct discharge of hot water.

[0012] Preferably, a steam pipe is provided on the second partition. The steam pipe is used to introduce the steam into the steam chamber of the heat recovery box after the hot water in the water storage chamber absorbs the waste heat to form steam. The heat recovery box is provided with a water storage chamber through the second partition. The steam pipe is connected to the steam exhaust pipe through a pipe. The steam exhaust pipe serves as a steam output channel and can transport the recovered steam to the scene where waste heat is needed, so as to realize the resource utilization of exhaust gas waste heat.

[0013] Preferably, all connections are equipped with sealing rings, and the flange connections of the gas connection pipe, water connection pipe, and first drain pipe are all fitted with fluororubber sealing rings for sealing and leak prevention—preventing both high-temperature exhaust gas leakage and cold water leakage. Furthermore, fluororubber is resistant to high and low temperatures and has strong corrosion resistance, making it suitable for high-temperature operating environments. The heat exchange protection pipe is a metal-ceramic fiber composite pipe, with an outer layer of stainless steel and an inner layer filled with ceramic fiber insulation. The hot water exchange pipe, spiral disc, and capillary gas pipe are all made of copper alloy. The end of the first water pipe furthest from the heat exchange box is connected to a water pump, and the end of the first gas pipe furthest from the heat exchange box is connected to a gas pump.

[0014] Beneficial effects

[0015] This invention provides a waste heat recovery mechanism for denitrification of internal combustion engine exhaust gas. Compared with the prior art, it has the following advantages:

[0016] (1) A waste heat recovery mechanism for denitrification of internal combustion engine exhaust gas, which avoids local failure by ensuring uniform gas-water flow. The gas delivery component distributes the exhaust gas evenly to the first gas distributor through a porous gas distribution structure, and then disperses the flow through capillary tubes to avoid heat exchange dead zones caused by excessive exhaust gas flow rate in some areas. The connecting water pipes at the top of each chamber are independently diverted to ensure that the hot water pipes of each heat exchange unit can be uniformly filled with water, preventing local overheating or insufficient heat exchange caused by uneven water flow, avoiding accelerated aging of heat exchange tubes, seals and other components due to local overheating, and also avoiding shortening the service life of the equipment and increasing maintenance costs.

[0017] (2) An internal combustion engine exhaust gas denitrification waste heat recovery mechanism, through cold water flowing down from the top chamber and exhaust gas flowing up from the bottom chamber, the two form a maximum temperature difference environment of high temperature exhaust gas meeting low temperature cold water at the contact interface of hot water pipe and capillary tube. In addition, the spiral trajectory of the spiral disc extends the water flow path, and the copper material of hot water pipe and capillary tube accelerates heat conduction, further ensuring that the exhaust gas waste heat is fully absorbed by cold water.

[0018] (3) An internal combustion engine exhaust gas denitrification waste heat recovery mechanism, which uses three chamber heat exchange units connected in a stepped manner. The bottom chamber treats high-temperature exhaust gas, releases a large amount of waste heat, and quickly heats cold water. The middle and top chambers treat the cooled exhaust gas. The whole process can adapt to different exhaust gas displacement and temperature changes of the internal combustion engine from idle speed to full load, thereby meeting actual needs. Attached Figure Description

[0019] Figure 1 This is a side view of the overall device structure of this utility model;

[0020] Figure 2 This is a side view of the heat exchange unit of this utility model;

[0021] Figure 3This is a side view of the water storage chamber structure of this utility model;

[0022] Figure 4 This is a side view of a portion of the heat exchange unit structure of this utility model;

[0023] Figure 5 This is a side view of the heat exchange unit structure of this utility model;

[0024] Figure 6 This is a side view of the water connection pipe structure of this utility model;

[0025] Figure 7 This is a side view of the gas transmission component structure of this utility model;

[0026] Figure 8 This is a side view of the gas connection pipe structure of this utility model.

[0027] In the diagram: 1. Heat exchanger; 2. Heat recovery tank; 3. First water pipe; 4. First gas pipe; 5. First exhaust pipe; 6. Bottom support; 7. Connecting water pipe; 8. Heat exchange protection pipe; 9. First gas distributor; 10. Hot water pipe; 11. Capillary tube; 12. Spiral disc; 13. Heat exchange drain pipe; 14. Gas connection pipe; 15. Water connection pipe; 16. First drain pipe; 17. Water storage chamber; 18. Steam pipe; 19. Steam exhaust pipe; 20. External water pipe; 21. First internal pipe; 22. Second internal pipe; 23. Gas delivery assembly. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example 1:

[0030] Please see Figure 1-8 A waste heat recovery mechanism for denitrification of internal combustion engine exhaust gas includes a bottom support 6, a heat exchange box 1 is provided on the bottom support 6, and a heat exchange unit is also provided. A partition is provided inside the heat exchange box 1, which divides the heat exchange box 1 into three chambers. The heat exchange unit is located inside the chambers.

[0031] The heat exchange unit includes a first gas distributor 9 and a water connection pipe 15. The first gas distributor 9 has a disc-shaped porous structure, and a heat exchange protection pipe 8 is fixedly connected to its outer side by welding. The heat exchange protection pipe 8 is sleeved on the outside of the first gas distributor 9 and the subsequent capillary tube 11 to form a closed protective space. The heat exchange protection pipe 8 is a metal-ceramic fiber composite pipe. The outer layer is made of 316L stainless steel, which can resist the corrosion of acidic substances derived from nitrogen oxides in the exhaust gas. The inner layer is filled with a high-alumina ceramic fiber heat insulation layer, which can effectively block the heat of the high-temperature exhaust gas in the capillary tube 11 from being lost to the outside of the heat exchange box 1, reducing the heat loss rate to below 5%. At the same time, it buffers the high-temperature impact and prevents the first inner pipe 21 and the second inner pipe 22 from cracking due to sudden temperature changes.

[0032] The heat exchange protection pipe 8 is symmetrically provided with a first inner pipe 21 and a second inner pipe 22. The two are arranged in parallel on both sides of the inner wall of the heat exchange protection pipe 8, forming an independent inlet and outlet channel for cold water in the heat exchange unit: the top of the first inner pipe 21 extends to the connecting water pipe 7 at the top of the chamber, and the bottom end is connected to the upper side of the hot water pipe 10 through a T-joint, which is responsible for accurately introducing cold water into the hot water pipe 10; the top of the second inner pipe 22 is closed, and the bottom end is connected to the heat exchange drain pipe 13 through an elbow, which is responsible for concentrating the heated hot water in the hot water pipe 10 to the water connecting pipe 15, forming an independent circulation path of cold water inlet and hot water outlet in a single chamber.

[0033] The spiral disk 12 is uniformly connected with capillary tubes 11, which are arranged in a circumferential array. The first gas distributor 9 at the top and bottom is connected by welding and sealing, forming a gas distribution structure with upper and lower double distributors and multiple capillary tubes in the middle. When the exhaust gas flows through the capillary tube 11, the small diameter of the tube creates a capillary effect, which increases the contact area between the exhaust gas and the inner wall of the capillary tube 11. At the same time, the high thermal conductivity of the copper material accelerates the transfer of heat from the exhaust gas to the outer heat exchange pipe 10, thus increasing the heat exchange efficiency of a single capillary tube 11.

[0034] The outer side of the spiral disc 12 is fixedly connected to a hot water exchange pipe 10 by a clamp. The hot water exchange pipe 10 is tightly wound along the spiral trajectory of the spiral disc 12, and its total length matches that of the spiral disc 12. Cold water flows inside, and through close contact with the spiral disc 12, it quickly absorbs the waste heat of the exhaust gas transmitted by the capillary tube 11. The bottom end of the outer side of the hot water exchange pipe 10 is connected to a heat exchange drain pipe 13 through a reducing joint. The bottom end is connected to the second inner pipe 22 through a flange seal, serving as an outlet channel for hot water after heating in the single chamber, which can prevent hot water from remaining in the pipe. The first inner pipe 21 is connected to three points on the upper side of the hot water exchange pipe 10 through a tee joint to ensure that cold water can be evenly distributed to each section of the hot water exchange pipe 10. The first gas distributor 9 at the bottom end of the capillary tube 11 is connected to a gas connection pipe 14 through a flange.

[0035] Gas connection pipe 14 is disposed between two chambers, water connection pipe 15 is disposed between two chambers, the upper side of water connection pipe 15 is connected to heat exchange drain pipe 13 in the upper chamber, and the lower side of water connection pipe 15 is connected to the first inner pipe 21 in the lower chamber.

[0036] A first water pipe 3 is connected to the heat exchange box 1. A connecting water pipe 7 is fixedly connected to the top of the chamber. One end of the connecting water pipe 7 is connected to an external water pipe 20. A first exhaust pipe 5 is connected to the top of the heat exchange box 1. A first air pipe 4 is connected to the side of the bottom chamber of the heat exchange box 1. An air supply assembly 23 is provided in the bottom chamber inside the heat exchange box 1.

[0037] The gas delivery assembly 23 is connected to the first gas pipe 4. The bottom chamber of the heat exchange box 1 is provided with a first drain pipe 16, which is connected to the heat exchange drain pipe 13 of the bottom chamber of the heat exchange box 1. The first drain pipe 16 is connected to the heat recovery box 2, and a second partition is provided inside the heat recovery box 2.

[0038] A steam pipe 18 is provided on the second partition, and a water storage chamber 17 is provided in the heat recovery box 2 through the second partition. The steam pipe 18 is connected to the steam exhaust pipe 19 through a pipe.

[0039] Fluororubber sealing rings are embedded at the flange connections of gas connection pipe 14, water connection pipe 15, and first drain pipe 16. The heat exchange protection pipe 8 is a metal-ceramic fiber composite pipe with a stainless steel outer layer and a ceramic fiber insulation layer filling the inner layer. The hot water pipe 10, spiral disc 12, and capillary gas pipe 11 are all made of copper alloy. The end of the first water pipe 3 away from the heat exchange box 1 is connected to a water pump, and the end of the first gas pipe 4 away from the heat exchange box 1 is connected to a gas pump.

[0040] Work process:

[0041] Phase 1:

[0042] Exhaust gas introduction and uniform gas distribution

[0043] The air pump delivers the exhaust gas from the internal combustion engine to be treated through the first air pipe 4 to the air delivery assembly 23 at the bottom chamber of the heat exchange box 1. The air delivery assembly 23 distributes the exhaust gas evenly to the first gas distributor 9 at the bottom chamber through a porous air distribution structure.

[0044] The exhaust gas enters the capillary tube 11 through the first gas distributor 9. During the flow process:

[0045] The exhaust gas exchanges heat with the cold water in the hot water pipe 10 outside the capillary tube, and the waste heat is absorbed by the cold water.

[0046] Series chamber reinforcement treatment

[0047] The exhaust gas after primary denitrification and heat exchange is sequentially introduced into the first gas distributor 9 of the intermediate chamber and the top chamber through the gas connecting pipe 14 between the chambers, and finally discharged to the subsequent purification equipment through the first exhaust pipe 5 at the top of the heat exchange box 1.

[0048] Phase Two:

[0049] Cold water introduction and diversion

[0050] The water pump delivers room temperature cold water through the external water pipe 20 to the connecting water pipe 7 at the top of each chamber of the heat exchange box 1. The cold water enters the first internal pipe 21 of the corresponding chamber through the connecting water pipe 7.

[0051] Countercurrent heat exchange and heating

[0052] Cold water flows into the hot water exchange pipe 10 from the first internal pipe 21 and flows downward along the spiral path of the spiral disc 12:

[0053] The hot water pipe 10 on the outside of the hot water pipe 10 directly exchanges heat with the high-temperature denitrification tail gas inside the capillary tube 11, and the cold water gradually heats up.

[0054] The heated hot water flows from the bottom of the hot water exchange pipe 10 into the heat exchange drain pipe 13, and then through the second inner pipe 22 to the water connection pipe 15 between the chambers.

[0055] Series heating and collection

[0056] The water connection pipe 15 follows the path from the top chamber to the middle chamber to the bottom chamber, transporting the hot water from the upper chamber to the first inner pipe 21 of the next chamber, repeating the heat exchange and heating process. Finally, the high-temperature hot water in the bottom chamber flows into the first drain pipe 16 through the heat exchange drain pipe 13.

[0057] Phase Three:

[0058] High-temperature hot water storage

[0059] The first drain pipe 16 transports the high-temperature hot water from the bottom chamber to the water storage chamber 17 of the heat recovery box 2. The water storage chamber 17 can temporarily store hot water, while cold water is replenished through the first water pipe 3 on the heat exchange box 1.

[0060] Steam generation and output

[0061] The high-temperature hot water in the water storage chamber 17 is heated to generate steam. The steam enters the steam exhaust pipe 19 through the steam pipe 18 on the second partition and is finally transported to the subsequent energy-consuming equipment to complete the resource utilization of waste heat.

[0062] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0064] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery mechanism for denitrification of internal combustion engine exhaust gas, comprising a bottom support (6), wherein a heat exchange box (1) is disposed on the bottom support (6), characterized in that, It also includes a heat exchange unit. The heat exchange box (1) is provided with a partition, which divides the heat exchange box (1) into three chambers. The heat exchange unit is located in the chamber. The heat exchange unit includes a first gas distributor (9) and a water connection pipe (15). A heat exchange protection pipe (8) is fixedly connected to the outside of the first gas distributor (9). A first inner pipe (21) and a second inner pipe (22) are provided inside the heat exchange protection pipe (8). A spiral disk (12) is provided on the lower side of the first gas distributor (9). A capillary tube (11) is connected through the spiral disk (12). The first gas distributor (9) is located at both ends of the capillary tube (11).

2. The waste heat recovery mechanism for denitrification of internal combustion engine exhaust gas according to claim 1, characterized in that: A hot water pipe (10) is fixedly connected to the outside of the spiral disc (12). A heat exchange drain pipe (13) is connected to the bottom of the outside of the hot water pipe (10). The heat exchange drain pipe (13) is connected to the second inner pipe (22). The first inner pipe (21) is connected to the upper side of the hot water pipe (10). A gas connection pipe (14) is connected to the bottom of the capillary tube (11).

3. The waste heat recovery mechanism for denitrification of internal combustion engine exhaust gas according to claim 2, characterized in that: The gas connection pipe (14) is located between the two chambers, and the water connection pipe (15) is located between the two chambers. The upper side of the water connection pipe (15) is connected to the heat exchange drain pipe (13) in the upper chamber, and the lower side of the water connection pipe (15) is connected to the first inner pipe (21) in the lower chamber.

4. The waste heat recovery mechanism for denitrification of internal combustion engine exhaust gas according to claim 2, characterized in that: The heat exchange box (1) is connected to a first water pipe (3), and a connecting water pipe (7) is fixedly connected to the top of the chamber. One end of the connecting water pipe (7) is connected to an external water pipe (20). The top of the heat exchange box (1) is connected to a first exhaust pipe (5). The bottom chamber of the heat exchange box (1) is connected to a first air pipe (4). The bottom chamber inside the heat exchange box (1) is equipped with an air supply assembly (23).

5. The waste heat recovery mechanism for denitrification of internal combustion engine exhaust gas according to claim 4, characterized in that: The gas delivery assembly (23) is connected to the first gas pipe (4). The bottom chamber of the heat exchange box (1) is provided with a first drain pipe (16). The first drain pipe (16) is connected to the heat exchange drain pipe (13) of the bottom chamber of the heat exchange box (1). The first drain pipe (16) is connected to the heat recovery box (2). The heat recovery box (2) is provided with a second partition.

6. The waste heat recovery mechanism for denitrification of internal combustion engine exhaust gas according to claim 5, characterized in that: A steam pipe (18) is provided on the second partition. The heat recovery box (2) is provided with a water storage chamber (17) through the second partition. The steam pipe (18) is connected to the steam exhaust pipe (19) through a pipe.

7. The waste heat recovery mechanism for denitrification of internal combustion engine exhaust gas according to claim 5, characterized in that: All connections are equipped with sealing rings. The flange connections of the gas connection pipe (14), water connection pipe (15), and first drain pipe (16) are all fitted with fluororubber sealing rings. The heat exchange protection pipe (8) is a metal-ceramic fiber composite pipe with a stainless steel outer layer and a ceramic fiber insulation layer filling the inner layer. The hot water pipe (10), spiral disc (12), and capillary tube (11) are all made of copper alloy. The end of the first water pipe (3) away from the heat exchange box (1) is connected to a water pump, and the end of the first air pipe (4) away from the heat exchange box (1) is connected to an air pump.

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