Composite heat source Stirling engine heating system

Abstract

The present invention relates to a Stirling engine and provides a composite heat source Stirling engine heat collection system, comprising a heating cavity, a heating tube cluster, a combustion heating device and a flue gas outlet, wherein the heating tube cluster is surrounded by the heating cavity arranged outside the heating cavity, the outer wall of the heating cavity is a light-transmitting layer, a solar energy concentrating heat collection device is arranged outside the light-transmitting layer to concentrate sunlight and enable it to pass through the light-transmitting layer to heat the working fluid in the heating tube cluster, the heating cavity is provided with the combustion heating device and the flue gas outlet, the heating tube cluster is formed by arranging a number of heating tubes, the working fluid inlet of the heating tube cluster is connected to a regenerator, and the working fluid outlet of the heating tube cluster is connected to an expansion chamber. The composite heat source Stirling engine heating system of the present invention can enable the Stirling engine to work all day and night, making up for the unstable and discontinuous characteristics of solar energy and improving the reliability of the Stirling engine.

Description

Technical Field

[0001] The present invention relates to a Stirling engine, in particular to a composite heat source Stirling engine heating system. Background Art

[0002] The Stirling engine is an external combustion engine. During the circulation process, there is no mass exchange between the working fluid and the external combustion system. It has low requirements for fuel quality and can utilize not only traditional fossil energy but also various renewable energy sources such as solar energy, biomass energy, geothermal energy, etc. In addition, the Stirling engine has the advantages of simple structure, low noise, small size, high theoretical efficiency, and easy control of pollutants. It has broad application prospects in the fields of power engineering and energy utilization.

[0003] Solar energy is an inexhaustible, renewable energy source with advantages such as cleanliness, safety, and widespread distribution. It is one of the heat sources with the greatest potential for application in Stirling engines. However, solar energy also has disadvantages such as low energy density, discontinuity, and instability, which are important factors hindering its large-scale development. To overcome its low energy density, solar Stirling engines typically use a concentrator during operation to enhance its radiation effect and increase radiation intensity. However, concentrators cannot address the instability and discontinuity of solar energy. Especially at night and on cloudy days, Stirling engines using solar energy as the sole heat source are difficult to operate continuously, and their reliability is significantly reduced. Therefore, a composite heat source Stirling engine system that simultaneously utilizes solar energy and other external heat sources is a reasonable choice. However, the existing Stirling engine heater generally uses a solar heat source on the inside and an auxiliary heat source on the outside. The inside is small in size, the solar heat absorption area is small, and the solar energy utilization efficiency is low. In addition, the external auxiliary heat source has a large heat dissipation area, which is not conducive to fully utilizing the energy of the auxiliary heat source.

[0004] Therefore, the present invention provides a composite heat source Stirling engine heating system to solve or alleviate the problems existing in the prior art. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a composite heat source Stirling engine heating system, which can enable the Stirling engine to work all day long, making up for the unstable and discontinuous characteristics of solar energy and improving the reliability of the Stirling engine.

[0006] In order to solve the above technical problems, the present invention provides a composite heat source Stirling engine heating system, including a heating cavity, a heating tube cluster, a combustion heating device and a flue gas outlet, wherein the heating tube cluster is surrounded by the heating cavity arranged outside it, and the outer wall of the heating cavity is a light-transmitting layer, and a solar concentrating heat collecting device is arranged outside the light-transmitting layer to concentrate sunlight and enable it to pass through the light-transmitting layer to heat the working fluid in the heating tube cluster, the heating cavity is provided with the combustion heating device and the flue gas outlet, the heating tube cluster is formed by a plurality of heating tubes, the working fluid inlet of the heating tube cluster is connected to the regenerator, and the working fluid outlet of the heating tube cluster is connected to the expansion chamber.

[0007] Preferably, the heating cavity is shaped like a mushroom.

[0008] Preferably, a plurality of the heating tubes are arranged to correspond to the shape of the heating cavity to form a mushroom-shaped heating tube cluster.

[0009] Preferably, the combustion and heating device is arranged on the light-transmitting layer, and the flue gas outlet is arranged opposite to the combustion and heating device. The combustion and heating device includes a burner, a fuel inlet and a combustion-supporting gas inlet. The fuel inlet and the combustion-supporting gas inlet are both connected to the burner, and the burner is connected to the inside of the heating cavity.

[0010] Preferably, the combustion heating device further comprises a sunshade, which is arranged on the outer side of the burner to prevent the burner from being excessively exposed to sunlight.

[0011] Preferably, the light-transmitting layer is a double-layer glass cover, and the interlayer of the double-layer glass cover is a vacuum layer.

[0012] Preferably, the outer wall of the heating tube is arranged with fins or ribs.

[0013] Preferably, the solar concentrating and heat collecting device includes a concentrating mirror, which is a parabolic reflector, and the reflecting surface of the concentrating mirror is arranged corresponding to the outer surface of the light-transmitting layer.

[0014] Specifically, the condenser is a single parabolic reflector or a plurality of parabolic reflectors spliced ​​together.

[0015] Preferably, it also includes a sunlight tracking rotation device, which is connected to the solar energy concentrating and heat collecting device to drive the solar energy concentrating and heat collecting device to track sunlight.

[0016] Through the above scheme, the beneficial effects of the present invention are as follows:

[0017] The outer wall of the heating cavity of the composite heat source Stirling engine heating system of the present invention is a light-transmitting layer. The solar energy concentrating and heat-collecting device converges sunlight and transmits the sunlight through the light-transmitting layer to heat the heating tube cluster, so that the working fluid in the heating tube cluster is heated and expands to do work. In the case of insufficient solar energy, the combustion heating device can burn gas to generate high-temperature flue gas as an auxiliary heat source, thereby heating the working fluid in the heating tube cluster. The composite heat source of solar energy and auxiliary heat is set, so that while using clean energy and saving the fuel required for gas heating, it ensures that the Stirling engine can work efficiently and all-weather, thereby improving reliability. The light-transmitting layer is set on the outer wall of the heating cavity, which can increase the heat absorption area of ​​solar energy and improve the utilization efficiency of solar energy.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is a schematic structural diagram of a specific embodiment of the composite heat source Stirling engine heating system of the present invention;

[0021] Figure 2 This is a schematic diagram of the appearance of a specific embodiment of the composite heat source Stirling engine heating system of the present invention;

[0022] Figure 3 It is a schematic diagram of the shape of a specific embodiment of the heating cavity;

[0023] Figure 4 is a schematic diagram of the shape of another specific embodiment of the heating cavity;

[0024] Figure 5 This is a schematic diagram of the arrangement of a specific embodiment of a heating tube cluster;

[0025] Figure 6 This is a schematic diagram of another specific embodiment of the arrangement of the heating tube cluster;

[0026] Figure 7 It is a structural schematic diagram of a specific implementation method of a heating tube cluster;

[0027] Figure 8 It is a structural schematic diagram of another specific embodiment of the heating tube cluster;

[0028] Figure 9 This is a schematic diagram of the arrangement of the smoke outlet;

[0029] Figure 10 It is a schematic diagram of a solar energy concentration method of a specific embodiment of a concentrator;

[0030] Figure 11 It is a schematic diagram of a solar energy concentration method of another specific embodiment of a concentrator.

[0031] Description of Reference Numerals

[0032] DETAILED DESCRIPTION

[0033] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and the scope of protection of the present invention is not limited to the specific embodiments described below.

[0034] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "form," "connect," "dispose," "connect," etc. should be understood in a broad sense. For example, connection can be direct or indirect through an intermediate medium; it can be fixed or detachable, or an integral connection; it can be direct or indirect through an intermediate connector; it can be internal communication between two elements or an interaction between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise specified, the orientation or positional relationship indicated by the directional words "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the accompanying drawings, and are only used to facilitate the description of the present invention and simplify the description, rather than to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; the orientation terms of the present invention should be understood in conjunction with the actual installation status.

[0036] The present invention provides a composite heat source Stirling engine heating system, see Figure 1 The composite heat source Stirling engine heating system of the present invention comprises a heating cavity 1, a heating tube cluster 2, a combustion heating device 3 and a flue gas outlet 4. The heating tube cluster 2 is surrounded by the heating cavity 1 arranged outside thereof. The outer wall of the heating cavity 1 is a light-transmitting layer 101. The light-transmitting layer 101 is arranged on the outer wall to increase the solar energy absorption area and improve the solar energy utilization efficiency. A solar energy concentrating and heat collecting device ( Figure 1(not shown), the solar concentrating and heat collecting device can concentrate sunlight and transmit the concentrated sunlight through the light-transmitting layer 101 to heat the working medium in the heating tube cluster 2. The heating cavity 1 is provided with a combustion heating device 3 and a flue gas outlet 4. The heating tube cluster 2 is formed by a plurality of heating tubes. The working medium inlet 5 of the heating tube cluster 2 is connected to the regenerator 7, and the working medium outlet 6 of the heating tube cluster 2 is connected to the expansion chamber 8. The working medium passing through the cooler 11 enters the regenerator 7 for preliminary heating, and then enters the heating tube cluster 2 for complete heating. After being completely heated, the working medium heats up and enters the expansion chamber 8 to expand, thereby driving the piston 10 to do work and maintaining the operation of the Stirling engine. When there is sufficient sunlight, solar energy is fully utilized to heat the working medium in the heating tube cluster 2, saving fuel costs. When there is but insufficient sunlight, the combustion heating device 3 can be used to generate high-temperature flue gas. The high-temperature flue gas enters the heating cavity 1 and exchanges heat with the working medium in the heating tube cluster 2. The flue gas after heat release is discharged through the flue gas outlet 4. The high-temperature flue gas and solar energy jointly heat the working medium in the heating tube cluster 2, thereby increasing the temperature of the working medium in the heating tube cluster 2, making up for the disadvantage of insufficient solar energy and meeting the continuity and stability of the Stirling engine's work. In the absence of sunlight, the high-temperature flue gas generated by the combustion heating device 3 can be fully utilized to heat the working medium in the heating tube cluster 2, so that the Stirling engine can work around the clock. It should be noted that the type of working medium in the heating tube cluster 2 is not limited, and is preferably an inert gas helium, but can also be gases such as hydrogen, air, and nitrogen. It should also be noted that the working medium inlet 5 can be formed by the pipe ends of the heating tubes constituting the heating tube cluster 2 being directly connected to the regenerator 7, or the pipe ends of the heating tubes being jointly connected to the gas collecting pipe, and then connected to the regenerator 7 through the gas collecting pipe; similarly, the working medium outlet 6 can be formed by the pipe ends of the heating tubes constituting the heating tube cluster 2 being directly connected to the expansion chamber 8, or the pipe ends of the heating tubes being jointly connected to the gas collecting pipe, and then connected to the expansion chamber 8 through the gas collecting pipe.

[0037] In order to increase the proportion of the sunlight absorption surface and reduce the proportion of the heat dissipation surface without increasing the volume of the Stirling engine heating cavity 1, see Figure 1 and Figure 2 The shape of the heating cavity 1 is set to be mushroom-shaped, based on Figure 1 and Figure 2 In the orientation shown, the top and sides of the heating cavity 1 are the light-transmitting layer 101, that is, the light-transmitting layer 101 is the outer wall of the umbrella part of the mushroom-shaped heating cavity 1. The top and sides of the heating cavity 1 can allow sunlight to pass through to heat the working fluid in the heating tube cluster 2. When the total surface area of ​​the outer wall of the heating cavity 1 is constant, the proportion of the effective heat absorption surface is increased and the proportion of the heat dissipation surface is reduced, thereby increasing the heat absorption of the working fluid in the tube, increasing the working fluid outlet temperature, enhancing the working capacity, and improving the efficiency of the Stirling engine.

[0038] Further, as a preferred embodiment of the composite heat source Stirling engine heating system of the present invention, see Figure 1 , a number of heating tubes are arranged in a shape corresponding to the heating cavity 1 to form a mushroom-shaped heating tube cluster 2. The arrangement of the heating tubes based on the outer shape of the heating cavity 1 (similar to a mushroom shape) can enable the heating tubes to fully utilize the volume of the heating cavity, increase the heat absorption of the working medium under the condition that the volume of the heating cavity 1 is certain, or reduce the volume of the heating cavity 1 under the condition that the heat absorption of the working medium is certain, thereby improving the space utilization efficiency of the heating cavity 1 and being more in line with the compactness of the Stirling engine. Moreover, when the combustion heating device 3 is used to generate high-temperature flue gas for heating, the heating tube cluster 2 arranged in a mushroom shape has a strong ability to disturb the flue gas, thereby improving the heat exchange rate. Specifically, the shape of the heating tube is quasi-"U"-shaped, formed by interconnecting an inner tube section and an outer tube section. The outer tube section is closer to the outer wall of the heating cavity 1 than the inner tube section. The outer periphery of the heating tube cluster 2 formed by the outer tube section and the inner periphery of the heating tube cluster 2 formed by the inner tube section are both arranged in a mushroom shape corresponding to the shape of the heating cavity 1. It should be noted that the "mushroom shape" described in the above technical solution can be a "mushroom-like shape", for example, Figure 3 The shape of the heating cavity 1 shown is a mushroom, and the cross section of the connection between the bottom and the side of the heating cavity 1 is an arc. Figure 5 The arrangement of the heating tube cluster 2 shown corresponds to the shape of the heating chamber 1. The inner tube section of the heating tube cluster 2 corresponds to the connection between the bottom and the side of the heating chamber 1 and is a circular curved tube section. The outer tube section of the heating tube cluster 2 corresponds to the connection between the bottom and the side of the heating chamber 1 and is also a circular curved tube section. Figure 4 The shape of the heating cavity 1 shown is a square mushroom, and the cross section of the connection between the bottom and the side of the heating cavity 1 is a right angle. Figure 6 The arrangement of the heating tube cluster 2 shown corresponds to the shape of the heating cavity 1. The inner tube section of the heating tube cluster 2 corresponds to the connection between the bottom and the side of the heating cavity 1, which is a right-angle bent tube section. The outer tube section of the heating tube cluster 2 corresponds to the connection between the bottom and the side of the heating cavity 1, which is a right-angle bent tube section.

[0039] As a preferred embodiment of the composite heat source Stirling engine heating system of the present invention, see Figure 1 The combustion and heating device 3 is arranged on the light-transmitting layer 101, and the smoke outlet 4 is arranged opposite to the combustion and heating device 3. Figure 1 Specifically, the combustion heating device 3 is arranged on the top of the light-transmitting layer 101 and on the central axis of the heating cavity 1. The flue gas outlet 4 is arranged at the bottom of the heating cavity 1, so that the high-temperature flue gas generated by the combustion heating device 3 can pass through the entire heating cavity 1 and fully heat the working medium in the heating tube cluster 2. More preferably, see Figure 9There are multiple flue gas outlets 4, and the number of flue gas outlets 4 should meet the requirements of flue gas discharge. The flue gas outlets 4 are evenly distributed along the central axis of the heating chamber 1 to ensure the smoothness of flue gas discharge, timely discharge the flue gas after heat release, and avoid heat exchange with the newly entered high-temperature flue gas. Specifically, the combustion heating device 3 includes a burner 301, a fuel inlet 302 and a combustion-supporting gas inlet 303. The fuel inlet 302 and the combustion-supporting gas inlet 303 are both connected to the burner 301. The combustible gas enters the burner 301 through the fuel inlet 302, and the combustion-supporting gas enters the burner 301 through the combustion-supporting gas inlet 303. The burner 301 ignites and burns, thereby generating high-temperature flue gas. The burner 301 is connected to the interior of the heating chamber 1. The high-temperature flue gas enters the interior of the heating chamber 1 to heat the working medium in the heating tube cluster 2. It should be noted that the above-mentioned combustible gas is preferably natural gas, and can also be other clean fuels, such as liquefied petroleum gas, coal gas, alcohol, etc.; the above-mentioned combustion-supporting gas is preferably air, which contains oxygen, has a large capacity, and is easy to obtain. In order to make the combustion more complete, a mixed gas with a high oxygen content or pure oxygen can also be used.

[0040] In addition, when solar energy is used for heating, since the sunlight is concentrated by the solar concentrating heat collecting device and then passes through the light-transmitting layer 101 to heat the working medium in the heating tube cluster 2, in order to avoid the sunlight irradiating the burner 301 for a long time and causing damage to the burner 301, see Figure 1 The combustion and heating device 3 further includes a sunshade 304 , which is arranged on the outer side of the burner 301 and can block sunlight.

[0041] As a preferred embodiment of the composite heat source Stirling engine heating system of the present invention, light-transmitting layer 101 is a double-layered glass cover. Sunlight can effectively penetrate the double-layered glass cover and enter the interior of heating cavity 1. To enhance the thermal insulation of light-transmitting layer 101 and reduce heat loss from heating cavity 1, the interlayer of the double-layered glass cover is a vacuum layer. Furthermore, to meet heating capacity requirements, the surface of the double-layered glass cover can be coated with an absorptive coating, such as an electroplated black chrome coating, a black nickel coating, a Mo-Al2O3 metal ceramic coating, or a Mo-SiO2 coating, to enhance sunlight absorption.

[0042] As a preferred embodiment of the composite heat source Stirling engine heating system of the present invention, see Figure 8 Fins or ribs are arranged on the outer wall of the heating tube to increase the heat exchange area of ​​the outer surface of the heating tube and improve the heat exchange effect. It should be noted that the heating tube can also be Figure 7 Smooth heater tube shown.

[0043] As a preferred embodiment of the composite heat source Stirling engine heating system of the present invention, see Figure 10 and Figure 11 The solar concentrating heat collecting device includes a concentrator 9, which is a parabolic reflector. The reflective surface of the concentrator 9 is arranged corresponding to the outer surface of the light-transmitting layer 101. When the composite heat source Stirling engine heating system of the present invention is in operation, the reflective surface of the concentrator 9 should face the incident direction of the sunlight 12, thereby collecting and reflecting the sunlight 12. The parabolic reflector relies on the characteristics of its own shape to converge the reflected sunlight 12, and transmits it through the light-transmitting layer 101 into the interior of the heating cavity 1, thereby heating the working medium in the heating tube cluster 2. It should be noted that the concentrator 9 can also be a Fresnel reflector to converge the sunlight 12 to enhance the intensity of sunlight entering the heating cavity 1.

[0044] See also Figure 10 The concentrator 9 can be a single parabolic reflector to collect sunlight and reflect it into the heating cavity 1 to heat the working medium in the heating tube cluster 2; the concentrator 9 can also be composed of multiple parabolic reflectors, see Figure 11 The plurality of parabolic emitting mirrors can be arranged according to the outer surface shape of the light-transmitting layer 101 , so that more of the concentrated and reflected sunlight 12 can be incident into the interior of the heating cavity 1 .

[0045] As a preferred embodiment of the composite heat source Stirling engine heating system of the present invention, the composite heat source Stirling engine heating system of the present invention also includes a sunlight tracking rotation device (not shown in the figure), which is connected to the solar energy concentrating and collecting device to drive the solar energy concentrating and collecting device to track sunlight. The sunlight tracking rotation device is a prior art. Specifically, the sunlight tracking rotation device is composed of a sensor, a controller and a rotation equipment. The sensor includes a tracking sensor and an illumination sensor. The tracking sensor is used to detect the azimuth and altitude angle of the sun. The sensor is composed of 5 photodiodes and a sun pointer, wherein a pair of photodiodes for detecting the azimuth angle is used. Photodiodes are symmetrically mounted on the east and west sides of the sundial to detect the deflection angle of the sun as it moves from east to west. A pair of photodiodes for detecting the altitude angle are symmetrically mounted on the north and south sides of the sundial to detect the sun's altitude. A photodiode is mounted on the top of the sundial to form an illumination sensor for detecting the intensity of solar radiation. When the sun's rays 12 tilt, the tracking sensor outputs a tilt signal composed of an azimuth deviation signal and an altitude signal, amplifies the tilt signal, and transmits it to the controller. The controller receives the signal and controls the rotating device to drive the solar concentrating and collecting device to rotate and adjust the angle so that it faces the sunlight to ensure the intensity of the light. It should be noted that when the solar concentrating and collecting device rotates, the heating cavity 1 should rotate accordingly to ensure that the sunlight concentrated by the solar concentrating and collecting device can pass through the light-transmitting layer 101 to heat the working medium in the heating tube cluster 2.

[0046] In order to better understand the technical solutions and technical effects of the present invention, the following is an explanation based on relevant test data and preferred technical features.

[0047] In a specific embodiment of the composite heat source Stirling engine heating system of the present invention, the shape of the heating cavity 1 is set to be mushroom-shaped, with a maximum radial cross-sectional diameter of 285 mm (the radial cross-sectional diameter is perpendicular to the central axis of the heating cavity 1), a height of 170 mm from top to bottom, and a volume of approximately 871136 mm. 3 The light-transmitting layer 101 is a double-layer glass cover, the thickness of the vacuum layer in the middle is 10 mm, and the outer wall area of ​​the light-transmitting layer 101 is 510900 mm 2 , of which the solar heat collection area is about 510000mm 2 Compared with a cubic heating cavity of the same volume, the solar heat absorption area of ​​the heating cavity 1 of the present invention can be increased by about 83%. Compared with a cylindrical heating cavity of the same volume with the same height and diameter, the solar heat absorption area of ​​the heating cavity 1 can be increased by about 67%. The heating cavity 1 of the composite heat source Stirling engine heating system of the present invention has a larger solar heat absorption area under the condition of the same volume, which improves the utilization efficiency of solar energy. The Stirling engine can operate efficiently, saving the fuel required for gas heating, and contributing to "carbon neutrality" and "carbon peak". At the same time, a combustion heat source is provided as a second heat source to solve the unstable and discontinuous characteristics of solar energy, so that the Stirling engine can work around the clock and improve the reliability of the Stirling engine.

[0048] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0049] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0050] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A composite heat source Stirling engine heating system, characterized in that: The invention comprises a heating cavity (1), a heating tube cluster (2), a combustion heating device (3) and a flue gas outlet (4), wherein the heating tube cluster (2) is surrounded by the heating cavity (1) arranged outside the heating cavity (1), the outer wall of the heating cavity (1) is a light-transmitting layer (101), and a solar energy concentrating heat collecting device is arranged outside the light-transmitting layer (101) to concentrate sunlight and enable it to pass through the light-transmitting layer (101) to heat the working medium in the heating tube cluster (2), the heating cavity (1) is provided with the combustion heating device (3) and the flue gas outlet (4), the heating tube cluster (2) is formed by arranging a plurality of heating tubes, the working medium inlet (5) of the heating tube cluster (2) is connected to a regenerator (7), and the working medium outlet (6) of the heating tube cluster (2) is connected to an expansion cavity (8); The heating cavity (1) is configured to be mushroom-shaped, and a plurality of the heating tubes are arranged corresponding to the shape of the heating cavity (1) to form a mushroom-shaped heating tube cluster (2). The smoke outlet (4) is arranged opposite to the combustion heating device (3), the combustion heating device (3) is arranged at the top of the light-transmitting layer (101), and the smoke outlet (4) is arranged at the bottom of the heating cavity (1). The combustion heating device (3) is located on the central axis of the heating cavity (1).

2. The composite heat source Stirling engine heating system according to claim 1, characterized in that: The combustion heating device (3) comprises a burner (301), a fuel inlet (302) and a combustion-supporting gas inlet (303); the fuel inlet (302) and the combustion-supporting gas inlet (303) are both connected to the burner (301); and the burner (301) is connected to the interior of the heating cavity (1).

3. The composite heat source Stirling engine heating system according to claim 2, characterized in that: The combustion and heating device (3) further comprises a shading plate (304), wherein the shading plate (304) is arranged on the outer surface of the burner (301) to prevent the burner (301) from being excessively irradiated by sunlight.

4. The composite heat source Stirling engine heating system according to claim 1, characterized in that: The light-transmitting layer (101) is a double-layer glass cover, and the interlayer of the double-layer glass cover is a vacuum layer.

5. The composite heat source Stirling engine heating system according to claim 1, characterized in that: The outer wall of the heating tube is arranged with fins or ribs.

6. The composite heat source Stirling engine heating system according to claim 1, characterized in that: The solar light-collecting and heat-collecting device comprises a concentrator (9), the concentrator (9) being a parabolic reflector, and the reflecting surface of the concentrator (9) being arranged corresponding to the outer surface of the light-transmitting layer (101).

7. The composite heat source Stirling engine heating system according to claim 6, characterized in that: The condenser (9) is a single parabolic reflector or a plurality of parabolic reflectors spliced ​​together.

8. The composite heat source Stirling engine heating system according to claim 1, characterized in that: It also includes a sunlight tracking rotation device, which is connected to the solar energy concentrating and heat collecting device to drive the solar energy concentrating and heat collecting device to track sunlight.

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