Energy-saving natural gas internal combustion generator set

Abstract

The application discloses an energy-saving natural gas internal combustion generator set, which is characterized by comprising a box shell, a generator set whole, an exhaust device, a filtering device and a preheating device; any side surface of the box shell in the width direction is provided with an air inlet, and the length direction side surface is provided with an air outlet; the exhaust device comprises an exhaust pipeline which extends upwards to the top of the box shell; the preheating device is arranged on the side surface of the box shell of the air inlet and is communicated with the air inlet; the preheating device comprises a plurality of heat exchange pipelines, and the gaps between the heat exchange pipelines are used for gas flow, so that the gas outside the box shell enters the box shell through the gaps; the preheating device further comprises an air inlet part and an air outlet part which are communicated with the two ends of the heat exchange pipelines; the air inlet part extends into the box shell and is communicated with the exhaust pipeline, and the air outlet part is communicated with the exhaust pipeline outside the box shell, so that the hot gas in the exhaust pipeline is introduced into the air channel and then is discharged into the exhaust pipeline through the air outlet part, thereby heating the cold gas flowing through the gaps and improving the temperature of the gas entering the box shell.

Description

Technical Field

[0001] This invention relates to the field of generator sets, specifically an energy-saving natural gas internal combustion generator set. Background Technology

[0002] CN214577369U discloses a snap-fit ​​box-type natural gas generator set, including a box-type machine room and a natural gas generator set, wherein the natural gas generator set is located inside the box-type machine room; a shock absorber is fixedly connected to the lower surface of the natural gas generator set by bolts; a heat dissipation water tank, an exhaust pipe, a flue gas boiler and a silencer are fixedly connected to the top of the outer wall of the box-type machine room by bolts.

[0003] Natural gas generator sets rely on the combustion of a mixture of natural gas and air. In the cold winters of northern regions, the extremely low temperatures cause reduced combustion efficiency and unstable combustion when the gas enters the generator set, resulting in energy waste. Existing technologies typically use electric heating to preheat the gas, but this method consumes electricity and still requires external energy; conversely, overheating the gas can also negatively impact combustion efficiency. Furthermore, existing engines often waste the hot exhaust gases during emissions, resulting in low utilization. Therefore, this invention provides an energy-saving natural gas internal combustion generator set. Summary of the Invention

[0004] The purpose of this invention is to provide an energy-saving natural gas internal combustion generator set to solve the problem of additional energy consumption due to electric heating mentioned in the background art.

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

[0006] An energy-saving natural gas internal combustion generator set is characterized by comprising a housing, a generator set assembly, an exhaust device, a filter device, and a preheating device; an air inlet is provided on any side in the width direction of the housing, and an air outlet is provided on the side in the length direction; the generator set assembly, the filter device, and the exhaust device are sequentially arranged inside the housing, with the exhaust device close to the air inlet; the exhaust device includes an exhaust pipe that extends upward to the outside of the top of the housing; the preheating device is located on the side of the housing at the air inlet and communicates with the air inlet, and the preheating device includes multiple heat exchange pipes, with gaps between the heat exchange pipes for gas flow, allowing gas outside the housing to enter the housing through the gaps;

[0007] The preheating device also includes an air inlet and an air outlet connected to both ends of the heat exchange pipe, which together form an air passage. The air inlet extends into the housing and is connected to the exhaust pipe, while the air outlet is connected to the exhaust pipe located outside the housing, so as to introduce the hot gas in the exhaust pipe into the air passage and then discharge it into the exhaust pipe through the air outlet, which is used to heat the cold gas flowing in the gap and increase the temperature of the gas entering the housing.

[0008] Preferably, multiple heat exchange pipes are arranged at intervals in the longitudinal direction to form multiple rows of heat exchange pipes, with adjacent rows of heat exchange pipes being staggered; the heat exchange pipes have a polygonal cross-section and the pipe walls are concave to form an arc surface; the arc surface pipe walls are used to guide gas diversion and increase the contact area with the gas; the area between adjacent heat exchange pipes in the longitudinal direction is positioned as a convergence zone, so that the diverted gas converges to reduce the gas velocity.

[0009] Preferably, each heat exchange pipe is further provided with a support assembly, which fills the angle between adjacent pipe walls to improve the support of the heat exchange pipe; the support assembly includes multiple support rods and multiple equidistant support frames, and the support frames have multiple ends for fixed connection with the support rods.

[0010] Preferably, the cross-sections of multiple support rods match the cross-sections at the angle between the adjacent pipe walls of the heat exchange pipe, so as to fill the angle; the side of the support frame facing the air inlet is provided with an air inlet, and the side adjacent to the air inlet is provided with an air outlet communicating with the air inlet.

[0011] Preferably, the air intake extends into the housing from the side closest to the housing and connects to the exhaust pipe. Baffles are also fixedly connected to the upper and lower sides of the air intake and the air outlet, thus forming a protective housing. An exhaust pipe is fixedly connected to the top of the air outlet, and the exhaust pipe passes through the baffle and connects to the exhaust pipe outside the housing.

[0012] Preferably, the air intake section is further provided with an adjustment assembly, which includes a telescopic part, a rotating plate, a return spring, and an adjustment rope; the telescopic part is located inside the air intake section and can deform at a specified temperature to stretch or contract toward or away from the air intake section; the rotating plate is rotatably connected to the side wall inside the air intake section away from the heat exchange pipe; one end of the adjustment rope is tied to the rotating plate, and the other end passes through the air intake section and is tied to the telescopic part; the return spring is located between the rotating plate and the inner side wall of the air intake section.

[0013] Preferably, the telescopic part is located in the gap of the heat exchange pipes closest to the air inlet; a flexible, telescopic sealing sleeve is fitted on the adjusting rope outside the air inlet, and the sealing sleeve is tied to the telescopic part together with the adjusting rope; the sealing sleeve is sealed to the side wall of the air inlet.

[0014] Preferably, a balancing assembly is also provided inside the air intake section. The balancing assembly includes a balancing plate and an elastic element. The balancing plate is slidably connected to the inner wall of the top of the air intake section, with one end extending into the exhaust pipe. The extended portion is bent upward into an arc surface, and the other end is bent downward. The elastic element is fixedly connected to the inner wall of the top of the air intake section, and the downward-bent portion of the balancing plate abuts against the elastic element.

[0015] Preferably, multiple arc-shaped guide plates bent toward the air intake are provided on the inner side wall of the exhaust pipe corresponding to the air intake, for guiding hot gas into the air intake.

[0016] Preferably, a transition device is provided on the side of the protective housing away from the casing. The transition device includes a guide shell, a filter frame, and multiple filter screens. The guide shell is fixedly connected to the side of the protective housing, and the filter frame is fixedly connected to the side of the guide shell. The filter frame is a hollow cylindrical frame. Multiple filter screens are arranged at equal intervals and fixedly connected inside the filter frame.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The heat from the exhaust gas is transferred to the cold air through the heat exchange pipes of the preheating device, thereby increasing the intake air temperature without the need for additional power. This not only reduces operating costs and eliminates reliance on external energy sources, but also makes it more energy-efficient and environmentally friendly, achieving energy recycling.

[0019] The heat exchange pipes are arranged in multiple staggered rows with concave walls, increasing the contact area with the cold air. The confluence and flow zones formed by the heat exchange pipes cause collisions and splits in the gas flow, extending the residence time and ensuring sufficient heat transfer. The air inlet and outlet in the support assembly further reduce the hot gas velocity, releasing more heat and making the cold air preheated evenly and quickly.

[0020] The regulating component uses shape memory alloy material to automatically adjust the preheating of cold gas: when the preheating temperature is too high, the shape memory alloy expansion plate automatically retracts to reduce the amount of hot gas entering; when the temperature decreases, it retracts to ensure stable preheating effect. This avoids overheating or underheating problems and improves the unit's adaptability to different environments.

[0021] The balancing assembly uses springs and a balance plate to regulate the gas distribution within the exhaust pipe, ensuring a relatively stable total amount of hot gas entering the preheating unit. This guarantees the stability of the preheating effect, thereby ensuring stable combustion of natural gas, improving power generation efficiency, and reducing resource waste.

[0022] The transition device uses a filter and guide shell to initially filter and preheat the cold air, preventing impurities from entering the unit while utilizing overflow heat to preheat the air. This protects the equipment and allows for the phased utilization of heat, improving overall energy efficiency. Attached Figure Description

[0023] Figure 1 This is a side view of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the connection between the preheating device and the exhaust pipe of the present invention;

[0025] Figure 3 This is an anatomical diagram of the preheating device and the housing structure of the present invention;

[0026] Figure 4 This is a structural disassembly diagram of the transition device and preheating device of the present invention;

[0027] Figure 5 This is a structural disassembly diagram of the preheating device of the present invention;

[0028] Figure 6 This is a front view of the connection between the exhaust pipe and the outlet of the present invention (the arrows indicate the direction of gas flow, and the rectangles only represent one intersection area).

[0029] Figure 7 This is a structural disassembly diagram of the heat exchange pipe and support assembly of the present invention;

[0030] Figure 8 This is a schematic diagram of the connection between the support rod and the support frame of the present invention;

[0031] Figure 9 This is a schematic diagram of the connection between the adjustment component and the air inlet of the present invention (this figure is a view of the air inlet facing the heat exchange pipe).

[0032] Figure 10 This is an exploded view of the structure at the connection between the air inlet and the heat exchange pipe of the present invention;

[0033] Figure 11 For the present invention Figure 10 Enlarged view of the structure at point A, where the structural adjustment component is located;

[0034] Figure 12 This is a schematic diagram of the rotation angle of the rotating part of the internal rotating plate of the air intake section of the present invention (the shape memory alloy telescopic plate is in the retracted state in this figure).

[0035] Figure 13 For the present invention Figure 12 Enlarged view of the shape memory alloy telescopic plate at point B in the middle;

[0036] Figure 14 This is a schematic diagram of the internal structure at the connection between the exhaust pipe and the intake section of the present invention;

[0037] Figure 15 For the present invention Figure 14 Enlarged view of the structure at the balancing component at point B;

[0038] Figure 16This is a cross-sectional view of the transition device of the present invention.

[0039] In the diagram: 1. Housing 1, Inlet 11, Outlet 12, Generator Set 2, Exhaust Device 3, Exhaust Pipe 31, Filter Device 4, Preheating Device 5, Heat Exchange Pipe 51, Confluence Zone 511, Flow Zone 512, Inlet 52, Outlet 53, Outlet Pipe 531, Support Assembly 54, Support Rod 541, Support Frame 542, Outlet Slot 5422, Inlet Slot 5421, Balance Assembly 55, Balance Plate 551, Balance Spring 552, Fixing Plate 553, Adjustment Assembly 57, Support Plate 571, Memory Alloy Telescopic Plate 572, Rotating Plate 573, Return Spring 574, Adjustment Rope 575, Sealing Sleeve 576, Transition Device 6, Guide Shell 61, Filter Frame 62, Filter Screen 63, Rotating Shaft 64, Cleaning Brush 65. Detailed Implementation

[0040] Example 1:

[0041] Please see Figures 1-16 The present invention provides a technical solution: such as Figures 1-4 As shown, an energy-saving natural gas-fired internal combustion generator set includes a housing 1, a generator set assembly 2, an exhaust device 3, a filter device 4, and a preheating device 5. The housing 1 has an air inlet 11 on any side in the width direction and an air outlet 12 on any side in the length direction. The generator set assembly 2, the filter device 4, and the exhaust device 3 are sequentially arranged inside the housing 1, with the exhaust device 3 located near the air inlet 11. The exhaust device 3 includes an exhaust pipe 31 that extends upwards to the outside of the top of the housing 1. The preheating device 5 is located on the side of the housing 1 where the air inlet 11 is located and communicates with the air inlet 11. The preheating device 5 includes multiple heat exchange pipes 51, and the gaps between the heat exchange pipes 51 are used for gas flow, allowing colder external gas to enter the housing 1 through the gaps. The filter device 4 has a fan that actively draws external gas into the housing 1 through the air inlet 11.

[0042] The preheating device 5 also includes an air inlet 52 and an air outlet 53 connected to both ends of the heat exchange pipe 51, which together form an air passage. The air inlet 52 extends into the housing 1 and is connected to the exhaust pipe 31. The air outlet 53 is connected to the exhaust pipe 31 located outside the housing 1, so as to introduce some of the hot gas in the exhaust pipe 31 into the air passage. The hot gas in the exhaust pipe 31 has a fast flow rate and will not backflow. It is then discharged into the exhaust pipe 31 through the air outlet 53 to heat the cold gas flowing in the gap and increase the temperature of the gas entering the housing 1.

[0043] like Figures 4-8As shown, multiple heat exchange pipes 51 are spaced apart longitudinally to form multiple rows of heat exchange pipes 51, with adjacent rows of heat exchange pipes 51 staggered. The heat exchange pipes 51 have polygonal cross-sections and concave walls. In this embodiment, the heat exchange pipes 51 have quadrilateral cross-sections and smooth concave arc surfaces; the concave walls increase the contact area with the gas, and the staggered arrangement of the heat exchange pipes 51 provides obstacles to the flow of cold gas, reducing the flow velocity. The area between adjacent heat exchange pipes 51 in the longitudinal direction is defined as the confluence zone 511, and the area between adjacent rows of pipes 51 in the transverse direction is defined as the flow zone 512. When cold gas flows from the flow zone 512 to the confluence zone 511, some of the cold gas will collide with the walls of adjacent rows of heat exchange pipes 51. The arc surface of the pipe wall will guide the gas to split, and after splitting, it will collide with another part of the gas, thereby reducing the gas velocity in the gaps and prolonging the residence time of the cold gas in the gaps, so that the cold gas can be fully heated.

[0044] Each heat exchange pipe 51 is also provided with a support assembly 54, which fills the angle between adjacent pipe walls of the heat exchange pipe 51 to improve the support of the heat exchange pipe 51 and prevent deformation. The support assembly 54 includes multiple support rods 541 and multiple equidistant support frames 542. The cross-section of the multiple support rods 541 matches the cross-section of the angle between adjacent pipe walls of the heat exchange pipe 51 to fill the angle. The support rods 541 extend beyond both ends of the heat exchange pipe 51. The support frames 542 have multiple ends for fixed connection with the support rods 541. In this embodiment, the support frames 542 are cross-shaped and have four ends that are fixedly connected to the corresponding support rods 541. The support frame 542 has a cross-shaped air inlet 5421 on the side facing the air inlet 52, and an air outlet 5422 communicating with the air inlet 5421 on the side adjacent to the air inlet 5421. This allows the hot gas in the exhaust pipe 31 to flow axially towards the air outlet 53 along the heat exchange pipe 51, and some gas to enter through the air inlet 5421 and flow radially out from the air outlet 5422 to merge with the axially flowing gas. This reduces the flow rate of the hot gas in the heat exchange pipe 51, allowing the temperature to be fully released and improving the preheating effect on the cold gas.

[0045] Both the air inlet 52 and the air outlet 53 are hollow boxes. The side of the air inlet 52 closest to the housing 1 extends into the housing 1 and connects to the exhaust pipe 31. Baffles are fixedly connected to the upper and lower sides of the air inlet 52 and the air outlet 53, thus forming a protective shell that is horizontally connected on both sides to enclose multiple heat exchange pipes 51, preventing heat loss and protecting the heat exchange pipes 51 from damage. An exhaust pipe 531 is fixedly connected to the top of the air outlet 53, and the exhaust pipe 531 passes through the baffles and connects to the exhaust pipe 31 outside the housing 1.

[0046] likeFigures 9-13 As shown, an adjustment component 57 is also provided on the air inlet 52 to adjust the amount of gas entering the heat exchange pipe 51, thereby indirectly adjusting the preheating effect on the cold gas. The adjustment component 57 includes a U-shaped support plate 571, a U-shaped shape memory alloy telescopic plate 572, a rotating plate 573, a return spring 574, and an adjustment rope 575; the support plate 571 is fixedly connected to the side wall of the air inlet 52 near the heat exchange pipe 51, and the support plate 571 is flush with the side of the row of heat exchange pipes 51 closest to the air inlet 11 (see...). Figure 9 The shape memory alloy telescopic plate 572 is fixedly connected to the support plate 571 at one end away from the air inlet 52, and slidably connected to the support plate 571 at the other end. The rotating plate 573 is rotatably connected to the inner wall of the air inlet 52 away from the heat exchange pipe 51. One end of the adjusting rope 575 is tied to the rotating plate 573, and the other end passes through the air inlet 52. A flexible, telescopic sealing sleeve 576 is fitted on the adjusting rope 575 outside the air inlet 52 (see...). Figure 13 The sealing sleeve 576 and the adjusting rope 575 are tied together to the shape memory alloy telescopic plate 572; the sealing sleeve 576 is sealed to the side wall of the air intake 52 to prevent hot gas from escaping. The two ends of the return spring 574 are fixedly connected to the rotating plate 573 and the inner side wall of the air intake 52, respectively. The shape memory alloy telescopic plate 572 is set with a threshold temperature for its own deformation to prevent the cold gas from being overheated and affecting combustion efficiency. When the cold gas is preheated to the threshold temperature set by the shape memory alloy telescopic plate 572, the shape memory alloy telescopic plate 572 contracts (see...). Figure 12 The rotating plate 573 is driven to rotate by adjusting the rope 575, thereby reducing the amount of hot gas entering the heat exchange pipe 51 and reducing the preheating effect on the cold gas. When the preheating temperature of the cold gas is lower than the deformation temperature set by the shape memory alloy telescopic plate 572, the shape memory alloy telescopic plate 572 stretches and resets, and the rotating plate 573 resets under the elastic action of the reset spring 574. The support plate 571 and the shape memory alloy telescopic plate 572 constitute the telescopic part.

[0047] like Figures 13-15As shown, a balancing assembly 55 is also provided inside the intake section 52 to ensure a stable flow of hot gas entering the intake section 52. The balancing assembly 55 includes a balancing plate 551, a balancing spring 552, and an L-shaped fixing plate 553. The balancing plate 551 is slidably connected to the inner wall of the top of the intake section 52, with one end extending into the exhaust pipe 31, the extended portion bent upwards into an arc, and the other end bent downwards. The vertical end of the fixing plate 553 is fixedly connected to the inner wall of the top of the intake section 52, and the horizontal portion is located below the downwardly bent portion of the balancing plate 551. The balancing spring 552 is located above the horizontal portion of the fixing plate 553, and both ends are fixedly connected to the side of the vertical portion of the fixing plate 553 and the side of the downwardly bent portion of the balancing plate 551, respectively. Multiple arc-shaped guide plates 311, bent towards the intake section 52, are also provided on the inner wall of the exhaust pipe 31 corresponding to the intake section 52 to guide the hot gas into the intake section 52. The balance spring 552 and the L-shaped fixing plate 553 constitute the elastic element.

[0048] like Figure 4 and Figure 16 As shown, a transition device 6 is also provided on the side of the protective housing away from the casing 1. The transition device 6 includes a guide shell 61, a filter frame 62, and multiple filter screens 63. The guide shell 61 is fixedly connected to the side of the protective housing, and the filter frame 62 is fixedly connected to the side of the guide shell 61. The filter frame 62 is a hollow cylindrical frame to ensure air intake, and multiple filter holes are opened on the surface of the filter frame 62. The multiple filter screens 63 are equidistantly arranged and fixedly connected inside the filter frame 62, thus forming a preliminary filtration system to perform preliminary filtration of the cold gas and reduce the velocity of the cold gas. Some of the heat generated by the heat exchange pipe 51 can also be guided to the filter frame 62 through the guide shell 61 to preheat the cold gas, thereby improving the heat utilization rate and the preheating effect of the cold gas.

[0049] Working principle: When the generator set 2 is running, the exhaust pipe 31 discharges hot gas accordingly. The hot gas enters multiple heat exchange pipes 51 through the intake section 52. In the heat exchange pipes 51, most of the hot gas flows axially along the heat exchange pipes 51, while a small portion of the hot gas enters through the intake port 5421 and flows out through the outlet port 5422. The outflow direction is perpendicular to most of the hot gas in the heat exchange pipes 51, which hinders the flow velocity of most of the hot gas, thus increasing the time the hot gas spends in the heat exchange pipes 51 and allowing the heat to be fully released. Finally, the gas flows through the outlet section 53 and the outlet pipe 531 to the exhaust pipe 31 outside the housing 1.

[0050] Meanwhile, the cold gas outside the casing 1 enters the casing 1 through the gap between the transition device 6 and the heat exchange pipe 51, and preheats the cold gas using the heat released by the hot gas during the flow. The specific process is as follows:

[0051] Preliminary preheating: When the cold gas flows through the filter frame 62 and filter screen 63 to the heat exchange pipe 51, it is blocked by multiple filter screens 63, and the gas flow rate decreases. Since some of the heat released by the heat exchange pipe 51 overflows into the filter frame 62, the cold gas can also be preheated.

[0052] Formal preheating: The initially preheated cold gas undergoes formal preheating in the gaps of the heat exchange pipes 51. The initially preheated cold gas flows from multiple flow zones 512 to the confluence zone 511. Part of the gas disperses and flows to the adjacent flow zones 512, while another part flows straight and is dispersed and guided towards a portion of the gas after colliding with the concave arc-shaped pipe walls of the adjacent heat exchange pipes 51. This collision and convergence reduces the gas velocity. Through multiple collisions and convergences between the multiple heat exchange pipes 51, the residence time of the gas is extended, thus fully preheating the gas. Finally, the gas flows into the housing 1 through the inlet 11.

[0053] If the gas is heated to an excessively high temperature, reaching the deformation threshold of the shape memory alloy telescopic plate 572, the plate will contract, causing the rotating plate 573 to rotate. This reduces the total amount of hot gas entering the heat exchange pipe 51, thus decreasing the preheating effect on the cold gas. When the temperature decreases, the shape memory alloy telescopic plate 572 automatically extends, and under the elastic action of the return spring 574, pushes the rotating plate 573 back to its original position.

[0054] If the amount of hot gas in the exhaust pipe 31 increases, it will push the balance plate 551 inside the exhaust pipe 31 towards the intake section 52. The balance spring 552 will be compressed, increasing the distance between the balance plate 551 and the inner wall of the exhaust pipe 31, allowing more gas to flow out of the casing 1. If the amount of hot gas in the exhaust pipe 31 decreases, the balance spring 552, under its elastic action, will push the balance plate 551 to move in the opposite direction, decreasing the distance between the balance plate 551 and the inner wall of the exhaust pipe 31. This will guide more hot gas into the intake section 52, ensuring a stable total amount of hot gas in the heat exchange pipe 51, thereby ensuring a stable preheating effect on the cold gas. This, in turn, ensures the combustion effect of natural gas, preventing incomplete combustion and resource waste.

[0055] Example 2

[0056] Based on Example 1, such as Figure 4 and Figure 16As shown, a dust removal assembly is also provided to clean the surface of the filter frame 62. The dust removal assembly includes a rotating shaft 64 rotatably connected to the middle of the filter frame 62 and a cleaning brush 65 disposed on the outer wall of the filter frame 62. The rotating shaft 64 extends out of the side of the filter frame 62, and the cleaning brush 65 matches the cross-section of the outer wall of the filter frame 62 and is fixedly connected to the extended part of the rotating shaft 64. The surface of the filter frame 62 is cleaned and dust is removed by manually rotating the cleaning brush 65 to ensure air intake. The filter frame 62 can be cleaned during routine maintenance of the equipment of this application.

Claims

1. An energy-saving natural gas-fired internal combustion generator set, characterized in that: The assembly includes a housing (1), a generator set (2), an exhaust device (3), a filter device (4), and a preheating device (5). The housing (1) has an air inlet (11) on any side in the width direction and an air outlet (12) on the side in the length direction. The generator set (2), the filter device (4), and the exhaust device (3) are arranged in sequence inside the housing (1), and the exhaust device (3) is close to the air inlet (11). The exhaust device (3) includes an exhaust pipe (31) that extends upward to the outside of the top of the housing (1). The preheating device (5) is arranged on the side of the housing (1) at the air inlet (11) and is connected to the air inlet (11). The preheating device (5) includes multiple heat exchange pipes (51). The gaps between the heat exchange pipes (51) are used for gas flow, so that the gas outside the housing (1) enters the housing (1) through the gaps. The preheating device (5) also includes an air inlet (52) and an air outlet (53) connected to both ends of the heat exchange pipe (51), which together form an air passage. The air inlet (52) extends into the housing (1) and is connected to the exhaust pipe (31). The air outlet (53) is connected to the exhaust pipe (31) located outside the housing (1) so as to introduce the hot gas in the exhaust pipe (31) into the air passage and then discharge it into the exhaust pipe (31) through the air outlet (53) to heat the cold gas flowing in the gap and increase the temperature of the gas entering the housing (1).

2. The energy-saving natural gas-fired internal combustion generator set according to claim 1, characterized in that: Multiple heat exchange pipes (51) are spaced apart in the longitudinal direction to form multiple rows of heat exchange pipes (51), and the heat exchange pipes (51) in adjacent rows are staggered; the heat exchange pipes (51) have a polygonal cross section and the inner wall of the pipe is concave to an arc surface; the arc surface pipe wall is used to guide the gas diversion and increase the contact area with the gas; the area between adjacent heat exchange pipes (51) in the longitudinal direction is positioned as the confluence area (511) so that the diverted gas converges to reduce the gas velocity.

3. The energy-saving natural gas-fired internal combustion generator set according to claim 1, characterized in that: Each heat exchange pipe (51) is also provided with a support assembly (54). The support assembly (54) fills the angle between adjacent pipe walls of the heat exchange pipe (51) to improve the support of the heat exchange pipe (51). The support assembly (54) includes multiple support rods (541) and multiple support frames (542) arranged at equal intervals. The support frame (542) has multiple ends for fixed connection with the support rods (541).

4. The energy-saving natural gas-fired internal combustion generator set according to claim 3, characterized in that: The cross sections of multiple support rods (541) match the cross sections of the adjacent pipe walls of the heat exchange pipe (51) to fill the corners; the support frame (542) has an air inlet (5421) on the side facing the air inlet (52), and an air outlet (5422) communicating with the air inlet (5421) is opened on the side adjacent to the air inlet (5421).

5. The energy-saving natural gas-fired internal combustion generator set according to claim 1, characterized in that: The air intake (52) extends into the housing (1) from the side near the housing (1) and connects to the exhaust pipe (31). Baffles are also fixedly connected to the upper and lower sides of the air intake (52) and the air outlet (53) to form a protective housing. An exhaust pipe (531) is fixedly connected to the top of the air outlet (53). The exhaust pipe (531) passes through the baffle and connects to the exhaust pipe (31) outside the housing (1).

6. The energy-saving natural gas-fired internal combustion generator set according to claim 1, characterized in that: An adjustment assembly (57) is also provided on the air intake (52). The adjustment assembly (57) includes a telescopic part, a rotating plate (573), a return spring (574), and an adjustment rope (575). The telescopic part is located inside the air intake (52) and can deform at a specified temperature to stretch or contract toward or away from the air intake (52). The rotating plate (573) is rotatably connected to the side wall inside the air intake (52) away from the heat exchange pipe (51). One end of the adjustment rope (575) is tied to the rotating plate (573), and the other end passes through the air intake (52) and is tied to the telescopic part. The return spring (574) is located between the rotating plate (573) and the inner side wall of the air intake (52).

7. The energy-saving natural gas-fired internal combustion generator set according to claim 6, characterized in that: The telescopic part is located in the gap of a row of heat exchange pipes (51) closest to the air inlet (11); a flexible sealing sleeve (576) with telescopic capability is fitted on the adjusting rope (575) outside the air inlet (52), and the sealing sleeve (576) and the adjusting rope (575) are tied together to the telescopic part; the sealing sleeve (576) is sealed to the side wall of the air inlet (52).

8. The energy-saving natural gas-fired internal combustion generator set according to claim 1, characterized in that: A balance assembly (55) is also provided inside the air intake (52). The balance assembly (55) includes a balance plate (551) and an elastic member. The balance plate (551) is slidably connected to the inner wall of the top of the air intake (52), with one end extending into the exhaust pipe (31). The extended part is bent upward into an arc surface, and the other end is bent downward. The elastic member is fixedly connected to the inner wall of the top of the air intake (52), and the downward bent part of the balance plate (551) abuts against the elastic member.

9. The energy-saving natural gas-fired internal combustion generator set according to claim 1, characterized in that: Multiple arc-shaped guide plates (311) that bend toward the air intake (52) are also provided on the inner wall of the exhaust pipe (31) corresponding to the air intake (52) to guide hot gas into the air intake (52).

10. An energy-saving natural gas-fired internal combustion generator set according to claim 5, characterized in that: A transition device (6) is provided on the side of the protective housing away from the housing (1). The transition device (6) includes a guide shell (61), a filter frame (62) and multiple filter screens (63). The guide shell (61) is fixedly connected to the side of the protective housing, and the filter frame (62) is fixedly connected to the side of the guide shell (61). The filter frame (62) is a hollow cylindrical frame. Multiple filter screens (63) are equidistantly arranged and fixedly connected inside the filter frame (62).

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