Exhaust heat recovery device

Abstract

The utility model discloses a kind of waste heat recovery devices, belong to waste heat recovery technical field.The waste heat recovery device of the utility model, by high-temperature gas in exhaust line is passed into waste heat line, to make high-temperature gas can heat the water in steam generation cavity and produce steam, with the pressure increase in steam generation cavity, steam can enter shell cavity by air inlet and promote impeller rotation, and then make impeller drive shaft rotation, to output torque by drive shaft, to realize the heat energy of high-temperature gas direct conversion into torque output, waste heat recovery device can be used as rotary drive device, to drive the rotating equipment in workshop where waste heat recovery device is located to work, not only simple structure, low in cost, strong universality, but also can reduce energy loss, it is favorable to improve waste heat utilization rate, with the effect of reducing cost, energy saving.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, and in particular to a waste heat recovery device. Background Technology

[0002] During operation, diesel engines utilize approximately 45% of the fuel's calorific value effectively, with about 30% of that calorific value carried away by the flue gas. The flue gas temperature is typically between 100°C and 400°C, or even higher. If the calorific value carried away by the flue gas cannot be effectively utilized, it will result in a significant waste of energy.

[0003] In related technologies, waste heat recovery from flue gas is commonly used to improve the fuel thermal efficiency of diesel engines. However, this method requires a large-scale infrastructure, which is not only costly and expensive, but also highly specific and lacks universality. Furthermore, for diesel engines currently undergoing testing, there is no clear technical solution for waste heat utilization. Utility Model Content

[0004] The purpose of this invention is to provide a waste heat recovery device that can recover waste heat from high-temperature gases with low investment.

[0005] To achieve the above objectives, the following technical solution is provided:

[0006] Waste heat recovery device, including:

[0007] A steam generator, comprising a waste heat pipeline and a steam generation chamber, wherein the waste heat pipeline passes through the steam generation chamber and is used to connect with an exhaust pipeline for conveying high-temperature gas;

[0008] An impeller mechanism includes an impeller and a housing. The housing includes a cavity and an air inlet and an air outlet, both of which are connected to the cavity. The impeller is rotatably disposed within the cavity, and the air inlet is connected to the steam generating chamber.

[0009] A rotary drive mechanism includes a drive shaft, and the impeller is connected to the drive shaft in a transmission manner, wherein the impeller can drive the drive shaft to rotate.

[0010] As a preferred technical solution of the above-mentioned waste heat recovery device, the waste heat recovery device further includes a water tank, which is connected to the steam generation chamber;

[0011] A water supply valve is provided between the water tank and the steam generating chamber.

[0012] As a preferred technical solution of the above-mentioned waste heat recovery device, a steam valve is provided between the air inlet and the steam generation chamber.

[0013] As a preferred technical solution for the above-mentioned waste heat recovery device, the steam valve is a pressure valve.

[0014] As a preferred technical solution of the above-mentioned waste heat recovery device, the steam generator further includes a pressure relief valve communicating with the steam generation chamber.

[0015] As a preferred technical solution of the above-mentioned waste heat recovery device, the impeller includes blades, and the large surface of the blades is arranged parallel to the axial direction of the impeller;

[0016] The axis of the air inlet is perpendicular to the large surface of the blade.

[0017] As a preferred technical solution of the above-mentioned waste heat recovery device, the rotary drive mechanism further includes a transmission component, the input end of which is connected to the impeller shaft, and the output end of which is connected to the drive shaft.

[0018] As a preferred technical solution of the above-mentioned waste heat recovery device, the transmission assembly includes a transmission component, a first transmission wheel, and a second transmission wheel. The first transmission wheel is fixedly connected to the wheel shaft of the impeller, and the second transmission wheel is fixedly connected to the drive shaft. The transmission component is arranged around the outside of the first transmission wheel and the second transmission wheel so that the first transmission wheel can drive the second transmission wheel to rotate through the transmission component.

[0019] As a preferred technical solution of the above-mentioned waste heat recovery device, the waste heat pipeline is located at the bottom of the steam generation chamber.

[0020] As a preferred technical solution of the above-mentioned waste heat recovery device, the cross-section of the waste heat pipeline is rectangular; the cross-section is perpendicular to the axial direction of the waste heat pipeline.

[0021] And / or, the longitudinal section of the steam generating chamber is rectangular; the longitudinal section is a section perpendicular to the axial direction of the waste heat pipeline.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] This waste heat recovery device introduces a method to heat water in a steam generation chamber by introducing high-temperature gas from an exhaust pipe into a waste heat pipe. As the pressure in the steam generation chamber increases, the steam enters the shell cavity through the inlet and drives the impeller to rotate. This, in turn, causes the impeller to drive the drive shaft, which outputs torque. In other words, this waste heat recovery device directly converts the thermal energy of the high-temperature gas into torque output. It can be used as a rotary drive to power rotating equipment in the workshop where it is located. This device is not only simple in structure, low in cost, and highly versatile, but it also reduces energy loss, improves waste heat utilization, and achieves cost reduction and energy conservation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the waste heat recovery device in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the steam generator in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the impeller mechanism and the rotary drive mechanism in the embodiments of this utility model;

[0027] Figure 4 This is a schematic diagram of the impeller mechanism in an embodiment of the present invention.

[0028] Figure label:

[0029] 100. Diesel engine; 200. Radiator fan; 1. Steam generator; 11. Waste heat pipeline; 12. Steam generation chamber; 13. Steam valve; 14. Pressure relief valve; 15. Steam pipeline; 16. Water supply pipeline; 2. Impeller mechanism; 21. Impeller; 211. Blade; 22. Shell; 221. Shell cavity; 222. Air inlet; 223. Air outlet; 3. Rotary drive mechanism; 31. Drive shaft; 32. Transmission component; 33. First transmission wheel; 34. Second transmission wheel; 4. Water tank; 41. Water supply valve; 51. First support; 52. Second support. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] It should be noted that similar labels 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.

[0033] In the description of this utility model, it should be noted that the terms "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 accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element 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 utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0037] like Figures 1 to 4 As shown, this embodiment provides a waste heat recovery device, including a steam generator 1, an impeller mechanism 2, and a rotary drive mechanism 3. The steam generator 1 includes a waste heat pipeline 11 and a steam generation chamber 12. The waste heat pipeline 11 passes through the steam generation chamber 12 and is used to connect with an exhaust pipeline for conveying high-temperature gas. The impeller mechanism 2 includes an impeller 21 and a housing 22. The housing 22 includes a cavity 221 and an inlet 222 and an outlet 223, both of which are connected to the cavity 221. The impeller 21 is rotatably disposed in the cavity 221, and the inlet 222 is connected to the steam generation chamber 12. The rotary drive mechanism 3 includes a drive shaft 31. The impeller 21 is drivenly connected to the drive shaft 31, and the impeller 21 can drive the drive shaft 31 to rotate.

[0038] Specifically, the exhaust pipe is connected to the exhaust port of the diesel engine 100, meaning that the exhaust pipe is the exhaust pipe of the diesel engine 100, thereby recovering waste heat from the high-temperature gases emitted by the diesel engine 100. Of course, the exhaust pipe can also be the exhaust pipe of other engines (such as gasoline engines, gas engines, etc.).

[0039] By introducing high-temperature gas from the exhaust pipe into the waste heat pipe 11, the high-temperature gas can heat the water in the steam generating chamber 12 and generate steam. As the pressure in the steam generating chamber 12 increases, the steam can enter the shell cavity 221 through the air inlet 222 and drive the impeller 21 to rotate, thereby causing the impeller 21 to drive the drive shaft 31 to rotate, and thus output torque through the drive shaft 31. In other words, the waste heat recovery device in this embodiment directly converts the heat energy of the high-temperature gas into torque output. The waste heat recovery device can be used as a rotary drive device to drive the rotating equipment (such as fans, blowers and other ventilation / heat dissipation equipment, or rotary pumps) in the workshop where the waste heat recovery device is located to work.

[0040] The waste heat recovery device in this embodiment is not only simple in structure, low in cost, and highly applicable, but it can also reduce energy loss, improve waste heat utilization, and thus improve the thermal efficiency of the engine.

[0041] It should be noted that the waste heat recovery device in this embodiment can be matched with the engine in the test phase, and can recover waste heat from the engine in the test phase with low investment, which helps to reduce costs and save energy.

[0042] It is understood that steam and condensate in the shell cavity 221 can be discharged through the outlet 223. Optionally, the outlet 223 is located at the bottom of the shell cavity 221 to facilitate the discharge of steam and condensate.

[0043] Optionally, the waste heat recovery device also includes a water tank 4, which is connected to the steam generation chamber 12. To facilitate steam generation and reserve sufficient space for steam, the water volume in the steam generation chamber 12 is half its capacity. As steam is continuously discharged, the water volume in the steam generation chamber 12 will continuously decrease. Water can be replenished into the steam generation chamber 12 through the water tank 4 to ensure the continuous operation of the waste heat recovery device.

[0044] Optionally, a water supply valve 41 is provided between the water tank 4 and the steam generating chamber 12. By operating the water supply valve 41, the connection or disconnection between the water tank 4 and the steam generating chamber 12 can be controlled. This not only improves the convenience of water supply but also prevents steam leakage in the steam generating chamber 12, thus avoiding affecting the steam pressure. For example, the water supply valve 41 is an on / off valve.

[0045] Optionally, a steam valve 13 is provided between the air inlet 222 and the steam generating chamber 12. By operating the steam valve 13, the connection between the steam generating chamber 12 and the air inlet 222 can be controlled to be disconnected. Thus, the steam valve 13 can be opened when the steam pressure in the steam generating chamber 12 reaches the usage requirements, which is beneficial to improving the steam working efficiency.

[0046] Optionally, the steam valve 13 is a pressure valve, which can automatically open when the steam pressure in the steam generating chamber 12 reaches the required level, thereby improving the working efficiency and ease of use of the waste heat recovery device.

[0047] Optionally, the steam generator 1 also includes a pressure relief valve 14 connected to the steam generating chamber 12, so that when the steam pressure in the steam generating chamber 12 reaches the safe pressure used by the steam generator 1, the pressure is relieved by the pressure relief valve 14 to avoid problems such as the steam generator 1 bursting due to high pressure, thereby improving safety.

[0048] Specifically, the steam generating chamber 12 is connected to the air inlet 222 via a steam pipe 15, and a steam valve 13 is located on the air inlet pipe. Furthermore, the steam generating chamber 12 is connected to the water tank 4 via a water supply pipe 16, and a water supply valve 41 is located on the water supply pipe 16.

[0049] Optionally, the impeller 21 includes blades 211, with the large surface of the blades 211 arranged parallel to the axial direction of the impeller 21. The large surface of the blade 211 is the outer surface with the largest area among the multiple outer surfaces of the blade 211. Typically, the blade 211 has two large surfaces, and the two large surfaces are parallel to each other. Optionally, the axis of the air inlet 222 is perpendicular to the large surface of the blades 211, thereby increasing the contact area between the steam and the blades 211 and improving the steam working efficiency.

[0050] Optionally, the rotary drive mechanism 3 also includes a transmission assembly. The input end of the transmission assembly is connected to the wheel shaft of the impeller 21, and the output end of the transmission assembly is connected to the drive shaft 31. By setting the transmission assembly, the distance between the drive shaft 31 and the impeller 21 can be increased, thereby improving the convenience of the arrangement of the drive shaft 31. In other words, it is easier to connect the drive shaft 31 to rotating equipment in the workshop.

[0051] Optionally, the transmission assembly includes a transmission member 32, a first transmission wheel 33, and a second transmission wheel 34. The first transmission wheel 33 is fixedly connected to the axle of the impeller 21, and the second transmission wheel 34 is fixedly connected to the drive shaft 31. The transmission member 32 is arranged around the outside of the first transmission wheel 33 and the second transmission wheel 34 so that the first transmission wheel 33 can drive the second transmission wheel 34 to rotate through the transmission member 32. Furthermore, by increasing the length of the transmission member 32, the distance between the drive shaft 31 and the impeller 21 can be increased, which not only improves the convenience of arranging the drive shaft 31 but also helps to reduce costs.

[0052] For example, the transmission component 32 is a belt, and both the first transmission wheel 33 and the second transmission wheel 34 are pulleys. Of course, the transmission component 32 can also be a chain, and both the first transmission wheel 33 and the second transmission wheel 34 are sprockets.

[0053] Specifically, the waste heat recovery device also includes a first support 51 and a second support 52. The housing 22 is fixed to the first support 51, and the impeller 21 is rotatably mounted inside the housing 22 through rotating support members such as bearings. The drive shaft 31 is rotatably mounted to the second support 52 through rotating support members such as bearings.

[0054] Optionally, the transmission assembly also includes a tensioning wheel, with the transmission member 32 wrapped around the outside of the tensioning wheel, thereby tensioning the transmission member 32 through the tensioning wheel, which helps to improve the transmission efficiency and reliability of the transmission assembly.

[0055] Optionally, the waste heat pipe 11 is located at the bottom of the steam generating chamber 12, so that the heat of the high-temperature gas in the waste heat pipe 11 can be fully utilized to heat the water in the steam generating chamber 12, thereby improving the heating efficiency.

[0056] Optionally, the waste heat pipe 11 is completely submerged in the water in the steam generating chamber 12. In other words, the top of the waste heat pipe 11 is located below the water surface in the steam generating chamber 12, thereby making full use of the heat of the high-temperature gas in the waste heat pipe 11 to heat the water in the steam generating chamber 12 and improve heating efficiency.

[0057] Optionally, the longitudinal section of the steam generating chamber 12 is rectangular; the longitudinal section is a section perpendicular to the axial direction of the waste heat pipe 11, which not only allows the waste heat pipe 11 to have a sufficiently large contact area with the water in the steam generating chamber 12, but also helps to reduce the space occupied by the steam generator 1 in the workshop.

[0058] Optionally, the waste heat pipe 11 has a circular cross-section; the cross-section is perpendicular to the axial direction of the waste heat pipe 11, which not only allows the waste heat pipe 11 to have a sufficiently large contact area with the water in the steam generating chamber 12, but also facilitates the processing and manufacturing of the waste heat pipe 11. Of course, the cross-section of the waste heat pipe 11 can also be rectangular.

[0059] Optionally, the waste heat pipe 11 has a straight structure, that is, the waste heat pipe 11 is a straight pipe, which can avoid the exhaust back pressure of the exhaust pipe being too high and affecting the engine performance.

[0060] By calculating the power generated by the rotation of impeller 21, the waste heat utilization rate, as well as parameters such as the diameter and rotation speed of impeller 21, can be determined. This is beneficial to improving the design and manufacturing efficiency of waste heat recovery devices, thereby increasing economic benefits.

[0061]

[0062] In the formula: P a ρ is the power generated by the rotation of impeller 21, in kW; ρ is the density of steam in steam generating chamber 12, in kg / m³. 3 T represents the temperature of the high-temperature gas inside waste heat pipe 11, in Kelvin (K); D 管 r is the inner diameter of steam pipe 15, in meters (m). 风 The radius of impeller 21 is in meters (m). 风 ω is the mass of impeller 21 in kg; ω is the angular velocity of impeller 21 in rad / s; η is the fuel calorific value utilization rate; P 总 This refers to the calorific value generated by the combustion of fuel consumed by a diesel engine per 100 kW.

[0063] For example, the waste heat recovery device of this embodiment recovers the exhaust waste heat of the diesel engine 100 during the test phase and drives the cooling fan 200 to rotate to provide ventilation and heat dissipation for the workshop. That is, the waste heat pipe 11 is connected to the exhaust pipe of the diesel engine 100, and the drive shaft 31 is connected to the rotating shaft of the cooling fan 200.

[0064] The diesel engine 100 has a full power output of 2200kW. When the diesel engine 100 operates at full power, its exhaust temperature T (i.e., the temperature of the high-temperature gas in the waste heat pipe 11) is 673.15K. At this temperature, the steam density ρ in the steam generation chamber 12 is 0.032kg / m³. 3 (Obtained by consulting relevant handbooks on engineering thermodynamics and fluid mechanics), and based on the fuel consumption rate and fuel calorific value of the diesel engine 100 (which are known values), it can be determined that the diesel engine 100 will produce a calorific value of 2.36 kW per hour from the combustion of fuel, i.e., P. 总 The power is 2.36 kW. The inner diameter D of steam pipe 15 is... 管 A steel pipe with a nominal diameter of 0.05m is selected, and the radius r of the impeller 21 is... 风 The impeller is designed to be 0.3m long, and the impeller 21 is made of aluminum alloy. The mass m of the impeller 21 can be calculated. 风 It weighs 6.05 kg, according to the formula:

[0065]

[0066] Calculation yields:

[0067] P a =0.046kW;

[0068] ω = 0.44 rad / s;

[0069] η = 1.949%.

[0070] In other words, when the waste heat recovery device of this embodiment drives the cooling fan 200 to rotate, the waste heat recovery device of this embodiment can provide a torque of 0.046kW and an angular velocity of 0.44rad / s, while improving the fuel calorific value utilization rate by about 1.949%. While meeting the ventilation and heat dissipation requirements of the test plant, it saves energy and reduces test costs.

[0071] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A waste heat recovery device, characterized in that, include: A steam generator (1) includes a waste heat pipe (11) and a steam generating chamber (12). The waste heat pipe (11) passes through the steam generating chamber (12) and is used to connect with an exhaust pipe that transports high-temperature gas. The impeller mechanism (2) includes an impeller (21) and a housing (22). The housing (22) includes a cavity (221), an air inlet (222) and an air outlet (223) that are both connected to the cavity (221). The impeller (21) is rotatably disposed in the cavity (221). The air inlet (222) is connected to the steam generating chamber (12). The rotary drive mechanism (3) includes a drive shaft (31), and the impeller (21) is connected to the drive shaft (31) in a transmission manner. The impeller (21) can drive the drive shaft (31) to rotate.

2. The waste heat recovery device according to claim 1, characterized in that, The waste heat recovery device also includes a water tank (4), which is connected to the steam generating chamber (12); A water supply valve (41) is provided between the water tank (4) and the steam generating chamber (12).

3. The waste heat recovery device according to claim 1, characterized in that, A steam valve (13) is provided between the air inlet (222) and the steam generating chamber (12).

4. The waste heat recovery device according to claim 3, characterized in that, The steam valve (13) is a pressure valve.

5. The waste heat recovery device according to claim 1, characterized in that, The steam generator (1) also includes a pressure relief valve (14) connected to the steam generating chamber (12).

6. The waste heat recovery device according to claim 1, characterized in that, The impeller (21) includes blades (211), and the large surface of the blades (211) is arranged parallel to the axial direction of the impeller (21); The axis of the air inlet (222) is perpendicular to the large surface of the blade (211).

7. The waste heat recovery device according to claim 1, characterized in that, The rotary drive mechanism (3) further includes a transmission assembly, the input end of which is connected to the wheel shaft of the impeller (21), and the output end of which is connected to the drive shaft (31).

8. The waste heat recovery device according to claim 7, characterized in that, The transmission assembly includes a transmission element (32), a first transmission wheel (33), and a second transmission wheel (34). The first transmission wheel (33) is fixedly connected to the axle of the impeller (21), and the second transmission wheel (34) is fixedly connected to the drive shaft (31). The transmission element (32) is arranged around the outside of the first transmission wheel (33) and the second transmission wheel (34) so ​​that the first transmission wheel (33) can drive the second transmission wheel (34) to rotate through the transmission element (32).

9. The waste heat recovery device according to any one of claims 1-8, characterized in that, The waste heat pipeline (11) is located at the bottom of the steam generating chamber (12).

10. The waste heat recovery device according to claim 9, characterized in that, The cross-section of the waste heat pipe (11) is rectangular; the cross-section is perpendicular to the axial direction of the waste heat pipe (11); And / or, the longitudinal section of the steam generating chamber (12) is rectangular; the longitudinal section is a section perpendicular to the axial direction of the waste heat pipeline (11).

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