Diesel generator set heat dissipation system based on indirect evaporative cooling and method thereof

Abstract

The application discloses a diesel generating set heat dissipation system and method based on indirect evaporative cooling, the system comprising an indirect evaporative cooler, the indirect evaporative cooler comprising a cross-flow part and a counter-flow part, the cross-flow part comprising dry air channels and first wet air channels which are cross-laid with each other, air flowing through the dry air channels flows in a second direction, and outlets of the dry air channels are directed towards a diesel generating set; air flowing through the first wet air channels flows in a first direction; the counter-flow part comprises second wet air channels and flue gas channels, air flowing through the second wet air channels flows in the second direction, flue gas flowing through the flue gas channels flows in the second direction, and the flow direction of the flue gas is opposite to that of the air in the second wet air channels; an inlet of the flue gas channels is connected with an exhaust port of the diesel generating set; outlets of the second wet air channels and the flue gas channels are both connected with an external environment; and an outlet of the first wet air channels is connected with an inlet of the second wet air channels through a through hole.

Description

Technical Field

[0001] This application relates to the field of heat engine cooling technology, and more specifically, to a diesel generator set cooling system and method based on indirect evaporative cooling. Background Technology

[0002] A diesel generator set is a generator that uses diesel fuel. The diesel engine converts the heat energy generated by fuel combustion into mechanical energy, which is then converted into electrical energy by the generator. Diesel generator sets have advantages such as high reliability, rapid start-up, and simple maintenance, and are therefore widely used in many fields. However, most existing diesel generator sets directly release exhaust gases into the atmosphere, causing significant thermal pollution and exacerbating the greenhouse effect. Therefore, it is necessary to design a cooling system for diesel generator sets to cool the exhaust gases produced, thereby avoiding environmental pollution and eliminating various safety hazards. Summary of the Invention

[0003] This application provides a diesel generator set cooling system and method based on indirect evaporative cooling. The system utilizes indirect evaporative cooling technology to generate dry and humid airflow. The dry and humid airflow achieves heat dissipation through forced convection heat exchange, while the humid airflow exchanges heat with the flue gas a second time to reduce the final exhaust temperature. This ensures the safe and stable operation of the diesel engine and greatly eliminates exhaust heat pollution.

[0004] The specific technical solution is as follows:

[0005] In a first aspect, embodiments of this application provide a diesel generator set cooling system based on indirect evaporative cooling, comprising:

[0006] The diesel generator set is housed within the central outer casing.

[0007] In a first direction, the bottom cover is disposed on the outer end face of the middle cover near the diesel generator set, and the bottom cover has a through hole communicating with the middle cover.

[0008] An indirect evaporative cooler includes a cross-flow section and a counter-flow section. The cross-flow section is located within a middle outer casing, and the counter-flow section is located within a bottom outer casing. The cross-flow section includes a dry air passage and a first humid air passage that are intersected and overlapped. Air flowing through the dry air passage flows in a second direction, and the outlet of the dry air passage faces the diesel generator set. Air flowing through the first humid air passage flows in the first direction. The counter-flow section includes a second humid air passage and a flue gas passage that are intersected and overlapped. Air flowing through the second humid air passage flows in the second direction, and flue gas flowing through the flue gas passage flows in the second direction, but in the opposite direction to the air flow in the second humid air passage. The inlet of the flue gas passage is connected to the exhaust port of the diesel generator set. The outlets of both the second humid air passage and the flue gas passage are connected to the external environment. The outlet of the first humid air passage passes through a through-hole and is connected to the inlet of the second humid air passage.

[0009] A lateral airflow diversion structure, disposed on the central outer cover, is used to divert air from the external environment to the inlet of the dry air channel.

[0010] A longitudinal airflow structure, disposed on the central outer cover, is used to draw air from the external environment to the inlet of the first humid air channel.

[0011] Multiple nozzles are disposed at the inlet of the first humid air channel.

[0012] A water tank is mounted on the central outer cover and is connected to multiple nozzles via a water pump.

[0013] The second direction is perpendicular to the first direction.

[0014] In some embodiments of this application, the diesel generator set includes a diesel engine, an electronic control system, and a radiator. In the second direction, the electronic control system, the diesel engine, and the radiator are arranged sequentially in a direction away from the forked flow portion, and a flow hole is provided on the end face of the middle outer cover near the radiator.

[0015] In some embodiments of this application, the orthographic projection of the diesel generator set in the first direction is located within the region where the countercurrent portion is located.

[0016] In some embodiments of this application, the water tank includes a first vertical portion, a second vertical portion, and a horizontal portion connecting the first vertical portion and the second vertical portion. The horizontal portion is disposed on the outer end face of the central outer cover away from the diesel generator set in the first direction. The first vertical portion and the second vertical portion are disposed on two opposite outer end faces of the central outer cover in a third direction. The first vertical portion, the second vertical portion, and the horizontal portion are all in close contact with the outer end face of the central outer cover. The third direction is perpendicular to both the first direction and the second direction.

[0017] In some embodiments of this application, the orthographic projection of the end of the diesel engine near the water tank in the third direction is located within the orthographic projection of the first vertical portion in the third direction, and / or within the orthographic projection of the second vertical portion in the third direction.

[0018] In some embodiments of this application, a flue gas distributor and a flue gas collector are also included. The middle outer cover has a flow hole on the end face of the diesel generator set in the second direction. The flue gas distributor is located on the outside of the middle outer cover and at the flow hole. The inlet of the flue gas distributor is connected to the exhaust port of the diesel generator set, and the outlet of the flue gas distributor is connected to the inlet of the flue gas collector. The flue gas collector is located on the outer end face of the bottom outer cover. The outlet of the flue gas collector is connected to the inlet of the flue gas passage, and the shape and size of the outlet of the flue gas collector match the shape and size of the inlet of the flue gas passage.

[0019] In some embodiments of this application, the transverse airflow structure includes a transverse fan and a flow guide shroud. The flow guide shroud is disposed on the outer end face of the middle outer cover near the crossflow portion in the second direction. The transverse fan is disposed on the outer side of the middle outer cover, and the air outlet of the transverse fan is connected to the air inlet of the flow guide shroud. The air outlet of the flow guide shroud is connected to the inlet of the dry air channel, and the shape and size of the air outlet of the flow guide shroud match the shape and size of the inlet of the dry air channel.

[0020] In some embodiments of this application, the longitudinal airflow structure includes a longitudinal fan and a top cover. The top cover is disposed on the outer end face of the middle cover away from the bottom cover in the first direction and is located at the entrance of the first humid air channel. The interior of the top cover is connected to the entrance of the first humid air channel. One or more longitudinal fans are disposed on the outer end face of the top cover away from the middle cover in the first direction. The air outlet of the longitudinal fan is connected to the interior of the top cover and faces the entrance of the first humid air channel. A plurality of nozzles are disposed inside the top cover.

[0021] In some embodiments of this application, a support base is also included, which is disposed on the outer end face of the bottom cover away from the middle cover in the second direction.

[0022] Secondly, embodiments of this application provide a diesel generator set heat dissipation method based on indirect evaporative cooling, applied to the diesel generator set heat dissipation system based on indirect evaporative cooling described in the first aspect. The diesel generator set heat dissipation method includes:

[0023] The diesel engine is cooled by the coolant in the cylinder during operation, and the radiator dissipates heat from the heated coolant.

[0024] External water is injected into a water tank covering the outer end face of the middle outer cover. The water tank absorbs the heat radiation from the hot surface of the diesel engine. At the same time, the water tank delivers water to multiple nozzles inside the top outer cover through a water pump. The water is sprayed out through the nozzles and enters the first humid air channel, where it forms a water film flowing from top to bottom on the inner wall of the first humid air channel by gravity.

[0025] Outside air introduced by the horizontal fan enters the dry air channel through the guide shroud. Within the dry air channel, it transfers heat to the water film adhering to the inner wall of the first humid air channel, then cools. The cooled outside air flows out from the outlet of the dry air channel, sweeping across the hot surface of the diesel engine. Subsequently, a portion of the airflow is absorbed by the diesel engine for combustion, converting into flue gas. This flue gas passes sequentially through a flue gas distributor and a flue gas collector before uniformly entering the flue gas channel, releasing heat to the humid, cold airflow in the second humid air channel. It is then discharged into the external environment through the outlet of the flue gas channel. Another portion of the airflow is drawn into the radiator to dissipate heat from the heated coolant. It then sweeps across the surface of the flue gas distributor, cooling the flue gas within it before being discharged into the external environment.

[0026] Outside air introduced by the longitudinal fan enters the first humid air channel through the top cover. It undergoes heat and mass transfer with the water film attached to the inner wall of the first humid air channel, resulting in cooling and humidification to form a humid airflow. The humid airflow flows from the outlet of the first humid air channel into the second humid air channel, flowing in the opposite direction to the flue gas in the flue gas channel, cooling the flue gas. Then, it is discharged into the outside environment through the outlet of the second humid air channel.

[0027] The beneficial effects of the embodiments of this application are as follows:

[0028] This invention differs from the traditional direct exhaust of high-temperature flue gas from diesel generator sets. It employs indirect evaporative cooling technology, simultaneously generating both dry and wet airflows, and fully utilizing both to create a highly integrated overall heat dissipation solution. The dry airflow reduces the surface temperature of the diesel generator set through forced convection, enhances the radiator's cooling effect, and further cools the exhaust gas. The wet airflow further reduces the exhaust gas temperature through efficient heat exchange similar to a plate heat exchanger. Furthermore, the use of a water tank that encloses the diesel engine solves the water supply problem and provides low-temperature shielding for the generator set's hot surfaces. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram of a diesel generator set cooling system based on indirect evaporative cooling provided in an embodiment of this application;

[0031] Figure 2 Four views of a diesel generator set heat dissipation system based on indirect evaporative cooling provided for an embodiment of this application, wherein (a) is a front view, (b) is a top view, (c) is a left view, and (d) is a right view;

[0032] Figure 3 A schematic diagram of the structure of an indirect evaporative cooler in a diesel generator set heat dissipation system based on indirect evaporative cooling, provided for an embodiment of this application;

[0033] Figure 4The following are four views of an indirect evaporative cooler in a diesel generator set heat dissipation system based on indirect evaporative cooling, provided in an embodiment of this application. (a) is a top view, (b) is a bottom view, (c) is a left view, and (d) is a right view. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The terms "comprising" and "having," and any variations thereof, in the embodiments and drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0036] This application discloses a diesel generator set cooling system based on indirect evaporative cooling. The details are described below.

[0037] Figure 1 A diesel generator set cooling system based on indirect evaporative cooling, according to an embodiment of this application, is shown. For example... Figure 1 As shown, the cooling system of this diesel generator set mainly includes: a middle outer cover 1, a bottom outer cover 3, an indirect evaporative cooler 4, a transverse airflow structure 5, a longitudinal airflow structure 6, multiple nozzles 71, and a water tank 72. The middle outer cover 1 and the bottom outer cover 3 are the main outer cover structures of the diesel generator set cooling system, used to provide placement positions for other components and to protect the casing. The indirect evaporative cooler 4 is installed inside the middle outer cover 1 and the bottom outer cover 3, and with the assistance of the transverse airflow structure 5, the longitudinal airflow structure 6, the multiple nozzles 71, and the water tank 72, it generates dry and humid airflows to perform secondary heat exchange on the exhaust gas generated by the diesel generator set 2, thereby reducing the final exhaust gas temperature.

[0038] Specifically, such as Figure 1As shown, in the first direction, the bottom outer cover 3 is disposed on the outer end face of the middle outer cover 1 near the diesel generator set 2, that is, the middle outer cover 1 and the bottom outer cover 3 are stacked sequentially from top to bottom along the first direction. The diesel generator set 2 is disposed at one end of the inner cavity of the middle outer cover 1. The bottom outer cover 3 is provided with a through hole 31 communicating with the middle outer cover 1, so as to facilitate the installation of the indirect evaporative cooler 4 in the middle outer cover 1 and the bottom outer cover 3. The through hole 31 is located at the other end of the inner cavity of the middle outer cover 1 to avoid interference between the installation of the diesel generator set 2 and the installation of the indirect evaporative cooler 4.

[0039] In this application, the first direction, the second direction, and the third direction are mutually perpendicular; for example, the central outer cover is a cuboid structure. Figure 1 As shown, the first direction refers to the direction of the long side of the middle outer cover 1, the second direction refers to the direction of the height of the middle outer cover 1, and the third direction refers to the direction of the width of the middle outer cover 1. However, it should be noted and understood that the verticality in this application is not absolute verticality, but can be 90°±10°.

[0040] In the embodiments of this application, such as Figure 1 , Figure 3 and Figure 4As shown, the indirect evaporative cooler 4 includes a crossflow section 41 and a counterflow section 42 that are perpendicularly connected to each other. The crossflow section 41 is located inside the middle outer cover 1, and the counterflow section 42 is located inside the bottom outer cover 3. The crossflow section 41 includes dry air passages 411 and first humid air passages 412 that are intersected and stacked. A first humid air passage 412 is provided between every pair of dry air passages 411, and similarly, a dry air passage 411 is provided between every pair of first humid air passages 412. The airflow directions in the dry air passages 411 and the first humid air passages 412 are perpendicular to each other. The air flowing through the dry air passages 411 flows in a second direction, and the outlet of the dry air passages 411 faces the diesel generator set 2. The air flowing through the first humid air passages 412 flows in a first direction. The counter-current section 42 includes overlapping second humid air channels (not shown in the figure) and flue gas channels 422. Similarly, a flue gas channel 422 is provided between each pair of second humid air channels, and a second humid air channel is provided between each pair of flue gas channels 422. The airflow directions within the second humid air channels and the flue gas channels 422 are parallel and opposite to each other. The air flowing through the second humid air channels flows in the second direction, and the flue gas flowing through the flue gas channels 422 flows in the second direction, but in the opposite direction to the airflow direction within the second humid air channels. The inlet is connected to the exhaust port of the diesel generator set 2 so that the flue gas generated by the diesel generator set 2 is guided into the flue gas passage 422. The outlet 4211 of the second humid air passage and the outlet 4221 of the flue gas passage 422 are both connected to the external environment so that the humid air and the cooled flue gas are discharged into the external environment. The outlet of the first humid air passage 412 is provided with a through hole 31 and connected to the inlet of the second humid air passage so that the humid and cold airflow formed in the first humid air passage 412 enters the second humid air passage and thus absorbs heat and cools the flue gas.

[0041] The lateral drainage structure serves as the drainage mechanism in the second direction of the diesel generator set's cooling system, such as... Figure 1 , Figure 3 and Figure 4 As shown, the transverse airflow diversion structure 5 is disposed on the middle outer cover 1 and is used to divert air from the external environment to the inlet of the dry air channel 411. In a specific embodiment, the transverse airflow diversion structure 5 includes a transverse fan 51 and a guide shroud 52. The guide shroud 52 is disposed on the outer end face of the middle outer cover 1 near the crossflow portion 41 in the second direction. The transverse fan 51 is disposed on the outer side of the middle outer cover 1, and the outlet of the transverse fan 51 is connected to the inlet of the guide shroud 52. The outlet of the guide shroud 52 is connected to the inlet of the dry air channel 411. Furthermore, the shape and size of the outlet of the guide shroud 52 match the shape and size of the inlet of the dry air channel 411 to ensure uniform flow in the multiple channels of the dry air channel 411.

[0042] The longitudinal airflow structure serves as the airflow diversion mechanism in the first direction of the diesel generator set's cooling system, such as... Figure 1 , Figure 3 and Figure 4 As shown, the longitudinal airflow structure 6 is disposed on the middle outer cover 1 and is used to draw air from the external environment to the inlet of the first humid air channel 412. In a specific embodiment, the longitudinal airflow structure 6 includes a longitudinal fan 61 and a top outer cover 62. The top outer cover 62 is disposed on the outer end face of the middle outer cover 1 away from the bottom outer cover 3 in a first direction and is located at the inlet of the first humid air channel 412. The interior of the top outer cover 62 is connected to the inlet of the first humid air channel 412. One or more longitudinal fans 61 are disposed on the outer end face of the top outer cover 62 away from the middle outer cover 1 in a first direction. The air outlet of the longitudinal fan 61 is connected to the interior of the top outer cover 62 and faces the inlet of the first humid air channel 412. Furthermore, the shape and size of the connecting hole between the top outer cover 62 and the middle outer cover 1 are the same as the shape and size of the inlet of the first humid air channel 412 to ensure uniform flow in the multi-channel first humid air channel 412.

[0043] Multiple nozzles, a water tank, and a water pump constitute the air humidification mechanism of the diesel generator set's cooling system. This mechanism humidifies the air in the first humid air passage and also cools it down. For example... Figure 1 As shown, multiple nozzles 71 are disposed at the inlet of the first humid air channel 412. Specifically, the multiple nozzles 71 are disposed inside the top outer cover 62 and face the inlet of the first humid air channel 412. A water tank 72 is disposed on the middle outer cover 1 and is connected to the multiple nozzles 71 through a water pump 73 to supply water to the nozzles 71.

[0044] In the embodiments of this application, such as Figure 1As shown, the diesel generator set 2 includes a diesel engine 21, an electronic control system 22, and a radiator 23. In the second direction, the electronic control system 22, the diesel engine 21, and the radiator 23 are arranged sequentially away from the crossflow section 41. During operation, the diesel engine 21 relies on the electronic control system 22 to output power, and the radiator 23 dissipates heat from the coolant used to cool the cylinder block of the diesel engine 21. Furthermore, a flow hole 31 is provided on the end face of the middle outer cover 1 near the radiator 23 to ensure smooth airflow within the middle outer cover 1, achieving efficient heat dissipation for the diesel generator set 2. In some specific embodiments, the orthographic projection of the diesel generator set 2 in the first direction is located in the area of ​​the counterflow section 42. On the one hand, this makes the overall structure of the diesel generator set cooling system compact and occupies less space. On the other hand, by placing the diesel generator set 2 above the counterflow section 42, the temperature below the diesel generator set 2 is kept within a relatively low range, preventing the temperature below from rising due to the operation of the diesel generator set 2, thus providing a good operating environment for the diesel generator set 2. In some other specific embodiments, the diesel generator set 2 may also be directly installed on the countercurrent section 42.

[0045] In some embodiments, such as Figure 1 and Figure 2 As shown, the water tank 72 includes a first vertical portion 721, a second vertical portion 722, and a horizontal portion 723 connecting the first vertical portion 721 and the second vertical portion 722. The first vertical portion 721, the horizontal portion 723, and the second vertical portion 722 form a U-shaped water tank structure. The horizontal portion 723 is disposed on the outer end face of the middle outer cover 1 away from the diesel generator set 2 in a first direction. The first vertical portion 721 and the second vertical portion 722 are disposed on opposite outer end faces of the middle outer cover 1 in a third direction. The first vertical portion 721, the second vertical portion 722, and the horizontal portion 723 are all in close contact with the outer end face of the middle outer cover 1, so that heat conduction can occur between the water tank 72 and the shell of the middle outer cover 1, thereby reducing the temperature inside the middle outer cover 1. Furthermore, in the specific implementation process, the orthographic projection of the end of the diesel engine 21 near the water tank 72 in the third direction is located within the orthographic projection of the first vertical portion 721 in the third direction, and / or within the orthographic projection of the second vertical portion 722 in the third direction. The shape and size of the water tank 72 are adapted to the shape and size of the diesel engine 21, and the water tank 72 is placed directly above the location of the diesel engine 21. This allows for effective absorption of heat radiation from the hot surface of the diesel engine 21 while keeping the overall structure of the water tank 72 as small as possible, thus preventing local overheating of the central outer casing 1.

[0046] In other embodiments, such as Figure 1As shown, the cooling system of the diesel generator set also includes a flue gas distributor 81 and a flue gas collector 82. The flue gas distributor 81 is located on the outside of the middle outer cover 1 and at the flow hole 31. The inlet of the flue gas distributor 81 is connected to the exhaust port of the diesel generator set 2 so that the airflow discharged through the middle outer cover 1 (mainly referring to the exhaust of the radiator 23) can cool the flue gas in the flue gas distributor 81. The outlet of the flue gas distributor 81 is connected to the inlet of the flue gas collector 82. The flue gas collector 82 is located on the outer end face of the bottom outer cover 3. The outlet of the flue gas collector 82 is connected to the inlet of the flue gas passage 422. The shape and size of the outlet of the flue gas collector 82 match the shape and size of the inlet of the flue gas passage 422. Thus, through the flue gas diversion effect of the flue gas distributor 81 and the flue gas collector 82, the flue gas generated by the diesel generator set 2 flows evenly into each channel of the flue gas passage 422, ensuring that the flow rate of the multiple channels of the flue gas passage 422 is uniform, thereby ensuring that the flue gas in the flue gas passage 422 can be cooled efficiently.

[0047] Furthermore, in the embodiments of this application, such as Figure 1 , Figure 3 and Figure 4 As shown, the diesel generator set cooling system also includes a support base 9. In the second direction, the support base 9 is disposed on the outer end face of the bottom outer cover 3 away from the middle outer cover 1. That is, the middle outer cover 1, the bottom outer cover 3, and the support base 9 are stacked sequentially from top to bottom along the first direction. The outlet 4211 of the second humid air passage and the outlet 4221 of the flue gas passage 422 are both disposed facing the support base 9. The outlet 4211 of the second humid air passage is located at the end near the inlet of the flue gas passage 422, and the outlet of the flue gas passage 422 is located at the end near the inlet of the second humid air passage. By setting the support base 9, there is a certain distance between the outlet 4211 of the second humid air passage and the outlet 4221 of the flue gas passage 422 and the horizontal ground, ensuring the smooth discharge of airflow in the second humid air passage and flue gas in the flue gas passage 422, thereby ensuring the overall airflow and ensuring the overall cooling effect of the diesel generator set cooling system.

[0048] The above describes the various components of the diesel generator set cooling system based on indirect evaporative cooling provided in this embodiment, as well as their interconnections. The following section will discuss further details... Figure 1 – Figure 4 The working principle of the cooling system of the diesel generator set is described in detail.

[0049] In this embodiment, the water tank 72 can be replenished by external water supply. On the one hand, the water tank 72 covering the outer end face of the middle outer cover 1 can absorb the heat radiation of the hot surface of the diesel engine 21 during operation. On the other hand, the water tank 72 supplies the required water source to the multiple nozzles 71 inside the top outer cover 62. The water supply is delivered to the multiple nozzles 71 by the water pump 73. The water supply is sprayed out through the nozzles 71 and enters the first humid air channel 412. Under the action of gravity, the water supply forms a water film flowing from top to bottom on the inner wall surface of the first humid air channel 412.

[0050] The air inlet of the horizontal fan 51 is connected to the external environment. The incoming air enters the guide shroud 52 under the action of the horizontal fan 51, and is evenly distributed into each channel of the dry air channel 411 under the guidance of the guide shroud 52. Since each channel of the dry air channel 411 is provided with a first humid air channel 412 on both sides, the incoming air can transfer heat to the water film attached to the inner wall of the first humid air channel 412 in the dry air channel 411 to achieve its own cooling. The cooled incoming air flows out from the outlet of the dry air channel 411 and flows through the electronic control system 22, the diesel engine 21 and the radiator 23 in sequence. The cooled incoming air sweeps the hot surface of the diesel engine 21, which can reduce the surface temperature of the diesel engine 21, cool down the diesel engine 21 and ensure that the diesel engine 21 has a good working environment. After sweeping the hot surface of the diesel engine 21, the incoming airflow is mainly divided into two parts. One part of the airflow is drawn into the radiator 23 to enhance the heat dissipation of the heated coolant. Then, it sweeps the surface of the flue gas distributor 81 again in a strong convection manner, thereby cooling the flue gas inside the flue gas distributor 81 and completing the first cooling of the flue gas. The cooled airflow is then discharged into the external environment. The other part of the airflow is absorbed by the diesel engine 21, and after combustion, it is converted into flue gas (i.e., the flue gas produced by the diesel generator set 2). The flue gas passes through the flue gas distributor 81 in sequence. The flue gas enters evenly into each channel of the flue gas channel 422 after the flue gas collector 82. Since each channel of the flue gas channel 422 has a second humid air channel on both sides, the flue gas in the flue gas channel 422 can release heat to the humid and cold airflow in the second humid air channel, thereby achieving a second cooling of the flue gas. After cooling, the flue gas is discharged to the outside environment through the outlet of the flue gas channel 422. The cooling system of this diesel generator set uses the flue gas emitted by the diesel engine 21 for secondary cooling, which can effectively avoid environmental pollution, eliminate various safety hazards, and has important application value.

[0051] Furthermore, the air inlet of the longitudinal fan 61 is also connected to the external environment. Outside air, under the action of the longitudinal fan 61, enters the first humid air channel 412 through the top cover 62. It undergoes heat and mass transfer with the water film adhering to the inner wall of the first humid air channel 412, achieving cooling and humidification of the outside air and forming a humid airflow. This humid airflow flows from the outlet of the first humid air channel 412 into the second humid air channel. Because it flows parallel and counter-currently to the flue gas in the flue gas channel 422, it can completely cool the flue gas flowing through the flue gas channel 422. The humid airflow absorbs heat from the flue gas and heats up, then is discharged into the external environment through the outlet of the second humid air channel. In this process, using humid air to cool the flue gas involves not only heat transfer but also mass transfer, effectively cooling the discharged flue gas and ensuring no thermal pollution.

[0052] This application also discloses a method for cooling a diesel generator set based on indirect evaporative cooling, which is applied to the diesel generator set cooling system based on indirect evaporative cooling in the foregoing embodiments. The specific structure and working principle of the diesel generator set cooling system can be found in the foregoing embodiments of the diesel generator set cooling system based on indirect evaporative cooling, and will not be repeated here.

[0053] The specific cooling methods for this diesel generator set include:

[0054] During operation, the diesel engine is cooled by the coolant in the cylinder block, and the radiator dissipates heat from the heated coolant.

[0055] External water is injected into the water tank on the outer end face of the middle outer cover. The water tank absorbs the heat radiation from the hot surface of the diesel engine. At the same time, the water tank delivers water to multiple nozzles inside the top outer cover through a water pump. The water is sprayed out through the nozzles and enters the first humid air channel. It forms a water film flowing from top to bottom on the inner wall of the first humid air channel by gravity.

[0056] Outside air introduced by the horizontal fan enters the dry air passage through the guide shroud. Inside the dry air passage, it transfers heat to the water film adhering to the inner wall of the first humid air passage and is then cooled. The cooled outside air flows out from the outlet of the dry air passage and sweeps across the hot surface of the diesel engine. Then, part of the airflow is absorbed by the diesel engine for combustion and power generation, turning into flue gas. The flue gas passes through the flue gas distributor and flue gas collector in sequence and then enters the flue gas passage evenly, releasing heat to the humid and cold airflow in the second humid air passage. It is then discharged to the outside environment through the outlet of the flue gas passage. Another part of the airflow is drawn into the radiator to dissipate heat from the heated coolant. It then sweeps across the surface of the flue gas distributor to cool the flue gas inside the distributor and is discharged to the outside environment.

[0057] Outside air introduced by the longitudinal fan enters the first humid air channel through the top cover. It undergoes heat and mass transfer with the water film attached to the inner wall of the first humid air channel, thus being cooled and humidified to form a humid airflow. The humid airflow flows from the outlet of the first humid air channel into the second humid air channel, flowing in the opposite direction to the flue gas in the flue gas channel, cooling the flue gas. Then, it is discharged into the outside environment through the outlet of the second humid air channel.

[0058] In summary, the diesel generator set heat dissipation system and method based on indirect evaporative cooling provided in this application embodiment utilizes indirect evaporative cooling technology to efficiently exchange heat on the high-temperature exhaust gas of the diesel generator set without significantly increasing energy consumption. At the same time, it also implements heat protection measures such as air-cooled sweeping and water-cooled shielding on the hot surfaces of the diesel generator set, thereby forming an integrated heat dissipation solution for the entire machine, ensuring the safe and stable operation of the diesel generator set and achieving low-temperature emission of exhaust gas.

[0059] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of one embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this application. Furthermore, the modules in the apparatus of the embodiments may be distributed throughout the apparatus of the embodiments as described, or they may be located in one or more apparatuses different from this embodiment, with corresponding changes. The modules of the above embodiments may be combined into one module, or further divided into multiple sub-modules.

[0060] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0061] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A diesel generator set cooling system based on indirect evaporative cooling, characterized in that, include: The diesel generator set is housed within the central outer casing. In a first direction, the bottom cover is disposed on the outer end face of the middle cover near the diesel generator set, and the bottom cover has a through hole communicating with the middle cover. An indirect evaporative cooler includes a cross-flow section and a counter-flow section. The cross-flow section is located within a middle outer casing, and the counter-flow section is located within a bottom outer casing. The cross-flow section includes a dry air passage and a first humid air passage that are intersected and overlapped. Air flowing through the dry air passage flows in a second direction, and the outlet of the dry air passage faces the diesel generator set. Air flowing through the first humid air passage flows in the first direction. The counter-flow section includes a second humid air passage and a flue gas passage that are intersected and overlapped. Air flowing through the second humid air passage flows in the second direction, and flue gas flowing through the flue gas passage flows in the second direction, but in the opposite direction to the air flow in the second humid air passage. The inlet of the flue gas passage is connected to the exhaust port of the diesel generator set. The outlets of both the second humid air passage and the flue gas passage are connected to the external environment. The outlet of the first humid air passage passes through a through-hole and is connected to the inlet of the second humid air passage. A lateral airflow diversion structure, disposed on the central outer cover, is used to divert air from the external environment to the inlet of the dry air channel. A longitudinal airflow structure, disposed on the central outer cover, is used to draw air from the external environment to the inlet of the first humid air channel. Multiple nozzles are disposed at the inlet of the first humid air channel. A water tank is mounted on the central outer cover and is connected to multiple nozzles via a water pump. The second direction is perpendicular to the first direction.

2. The diesel generator set cooling system based on indirect evaporative cooling according to claim 1, characterized in that, The diesel generator set includes a diesel engine, an electronic control system, and a radiator. In the second direction, the electronic control system, the diesel engine, and the radiator are arranged sequentially in a direction away from the fork in the flow section, and a flow hole is provided on the end face of the middle outer cover near the radiator.

3. The diesel generator set cooling system based on indirect evaporative cooling according to claim 2, characterized in that, The orthographic projection of the diesel generator set in the first direction is located within the region where the countercurrent section is situated.

4. The diesel generator set cooling system based on indirect evaporative cooling according to claim 2, characterized in that, The water tank includes a first vertical portion, a second vertical portion, and a horizontal portion connecting the first vertical portion and the second vertical portion. The horizontal portion is disposed on the outer end face of the central outer cover away from the diesel generator set in the first direction. The first vertical portion and the second vertical portion are disposed on the two opposite outer end faces of the central outer cover in a third direction. The first vertical portion, the second vertical portion, and the horizontal portion are all in close contact with the outer end face of the central outer cover. The third direction is perpendicular to both the first direction and the second direction.

5. The diesel generator set cooling system based on indirect evaporative cooling according to claim 4, characterized in that, The orthographic projection of the end of the diesel engine near the water tank in the third direction is located within the orthographic projection of the first vertical portion in the third direction, and / or within the orthographic projection of the second vertical portion in the third direction.

6. The diesel generator set cooling system based on indirect evaporative cooling according to claim 1, characterized in that, It also includes a flue gas distributor and a flue gas collector. The middle outer cover has a flow hole on the end face of the diesel generator set in the second direction. The flue gas distributor is located on the outside of the middle outer cover and at the flow hole. The inlet of the flue gas distributor is connected to the exhaust port of the diesel generator set, and the outlet of the flue gas distributor is connected to the inlet of the flue gas collector. The flue gas collector is located on the outer end face of the bottom outer cover. The outlet of the flue gas collector is connected to the inlet of the flue gas passage, and the shape and size of the outlet of the flue gas collector match the shape and size of the inlet of the flue gas passage.

7. The diesel generator set cooling system based on indirect evaporative cooling according to claim 6, characterized in that, The transverse airflow structure includes a transverse fan and a flow guide shroud. The flow guide shroud is disposed on the outer end face of the middle outer cover near the crossflow portion in the second direction. The transverse fan is disposed on the outer side of the middle outer cover, and the air outlet of the transverse fan is connected to the air inlet of the flow guide shroud. The air outlet of the flow guide shroud is connected to the inlet of the dry air channel, and the shape and size of the air outlet of the flow guide shroud match the shape and size of the inlet of the dry air channel.

8. The diesel generator set cooling system based on indirect evaporative cooling according to claim 7, characterized in that, The longitudinal airflow structure includes a longitudinal fan and a top cover. The top cover is disposed on the outer end face of the middle cover away from the bottom cover in the first direction and is located at the entrance of the first humid air channel. The interior of the top cover is connected to the entrance of the first humid air channel. One or more longitudinal fans are disposed on the outer end face of the top cover away from the middle cover in the first direction. The air outlet of the longitudinal fan is connected to the interior of the top cover and faces the entrance of the first humid air channel. A plurality of nozzles are disposed inside the top cover.

9. The diesel generator set cooling system based on indirect evaporative cooling according to claim 8, characterized in that, It also includes a support base, which is disposed on the outer end face of the bottom cover away from the middle cover in the second direction.

10. A method for heat dissipation of a diesel generator set based on indirect evaporative cooling, characterized in that, The diesel generator set cooling system based on indirect evaporative cooling as described in claim 9, wherein the diesel generator set cooling method comprises: The diesel engine is cooled by the coolant in the cylinder during operation, and the radiator dissipates heat from the heated coolant. External water is injected into a water tank covering the outer end face of the middle outer cover. The water tank absorbs the heat radiation from the hot surface of the diesel engine. At the same time, the water tank delivers water to multiple nozzles inside the top outer cover through a water pump. The water is sprayed out through the nozzles and enters the first humid air channel, where it forms a water film flowing from top to bottom on the inner wall of the first humid air channel by gravity. Outside air introduced by the horizontal fan enters the dry air channel through the guide shroud. Within the dry air channel, it transfers heat to the water film adhering to the inner wall of the first humid air channel, then cools. The cooled outside air flows out from the outlet of the dry air channel, sweeping across the hot surface of the diesel engine. Subsequently, a portion of the airflow is absorbed by the diesel engine for combustion, converting into flue gas. This flue gas passes sequentially through a flue gas distributor and a flue gas collector before uniformly entering the flue gas channel, releasing heat to the humid, cold airflow in the second humid air channel. It is then discharged into the external environment through the outlet of the flue gas channel. Another portion of the airflow is drawn into the radiator to dissipate heat from the heated coolant. It then sweeps across the surface of the flue gas distributor, cooling the flue gas within it before being discharged into the external environment. Outside air introduced by the longitudinal fan enters the first humid air channel through the top cover. It undergoes heat and mass transfer with the water film attached to the inner wall of the first humid air channel, resulting in cooling and humidification to form a humid airflow. The humid airflow flows from the outlet of the first humid air channel into the second humid air channel, flowing in the opposite direction to the flue gas in the flue gas channel, cooling the flue gas. Then, it is discharged into the outside environment through the outlet of the second humid air channel.

Images