Combined heat and power improvement system and method based on Stirling engine receiver and application

Abstract

The invention provides a combined heat and power improvement system and method based on a Stirling engine receiver and application, and belongs to the technical field of photo-thermal utilization. The combined heat and power improvement system comprises a cooling pipe which is spirally wound on the peripheral side of a receiver in the axial direction of the receiver, the cooling pipe is a hollow pipe, and a cooling working medium inlet and a cooling working medium outlet are formed in the two ends of the cooling pipe and used for introducing and discharging a cooling working medium; the control valve is arranged on the cooling pipe and used for controlling circulation, the flow speed and the flow quantity of the cooling working medium. According to the combined heat and power improvement system and method, the combined heat and power performance of the Stirling receiver can be achieved, high-temperature damage is prevented, the service life is prolonged, the Stirling engine can generate electricity more effectively, and the good actual application effect is achieved. When the combined heat and power improvement system is applied to a disc type Stirling photo-thermal power generation system, a cooling working medium and cooling water are used for utilizing high-grade heat energy and low-grade heat energy respectively, the overall # imgabs0 # efficiency of the system is improved, and gradient utilization of energy is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of photothermal utilization, and specifically relates to an improved cogeneration system, method and application based on a Stirling engine receiver. Background Art

[0002] With the advancement of the "dual carbon" goals, wind power generation and photovoltaic power generation systems have the characteristics of intermittent and fluctuating characteristics, and their proportion in the power system continues to increase. However, while meeting the electricity demand of the power system, they also bring greater peak-shaving pressure. Therefore, environmentally friendly solar thermal power generation technology is urgently needed to be developed.

[0003] The Solar Dish / Stirling System (SDSS) is a power generation device with good development prospects. It consists of a dish concentrator, a receiver, a Stirling engine, a generator and a dual-axis tracking control device. A large amount of solar radiation passes through the dish concentrator and is concentrated on the receiver at the focus. The surface temperature of the receiver rises and heats the gas (helium or hydrogen, etc.) working fluid in the hot chamber of the Stirling engine connected to it. The gas working fluid expands when heated in the hot chamber and contracts when cooled in the cold chamber, thus performing an expansion / compression cycle, pushing the piston to do work, and then the piston drives the AC generator to generate electricity.

[0004] Since solar radiation and Stirling engine load change all the time, solar radiation is stronger in summer. Long-term high solar radiation energy will cause the temperature of the receiver to exceed the maximum operating temperature. Long-term high temperature of the receiver will cause the temperature sensor wire to become brittle, and then burn the receiver and its casing. This state may damage the receiver and the entire Stirling engine for a long time. Therefore, a receiver cogeneration improvement system is urgently needed to improve this situation. Summary of the invention

[0005] The present invention is made to solve the above-mentioned problems, and aims to provide an improved cogeneration system, method and application based on a Stirling engine receiver.

[0006] The present invention provides an improved cogeneration system based on a Stirling engine receiver, which has the following characteristics: a cooling pipe, which is spirally wound around the circumference of the receiver along the axial direction of the receiver, and the cooling pipe is a hollow pipe with a cooling medium inlet and a cooling medium outlet at both ends, respectively, and the cooling medium inlet and the cooling medium outlet are used to pass the cooling medium in and out respectively; a control valve is arranged on the cooling pipe, and is used to control the circulation of the cooling medium in the cooling pipe and adjust the flow rate and flow of the cooling medium, wherein the receiver is arranged on the Stirling engine, and is used to receive solar radiation to generate heat and drive the Stirling engine to do work.

[0007] The improved heat and power cogeneration system based on the Stirling engine receiver provided by the present invention may also have the following features: wherein the receiver is in a truncated cone shape, a narrower side of which is connected to the Stirling engine, the cooling pipe is spirally embedded and wound to match the receiver, and the ratio of the spiral inner diameter of the cooling pipe to the outer diameter of the truncated cone receiver is 1:1.

[0008] The improved heat and power cogeneration system based on the Stirling engine receiver provided by the present invention may also have the following characteristics: wherein the cooling medium inlet is the end of the cooling pipe away from the Stirling engine, and the cooling medium outlet is the end of the cooling pipe close to the Stirling engine.

[0009] The improved heat and power cogeneration system based on the Stirling engine receiver provided by the present invention may also have the following feature: wherein the material of the receiver and / or the cooling pipe includes copper.

[0010] The present invention also provides an improved method for combined heat and power generation based on a Stirling engine receiver, which has the following characteristics: using any of the aforementioned improved combined heat and power generation systems based on a Stirling engine receiver, a cooling pipe is spirally wound around the circumference of the receiver, and when the receiver continues to absorb heat and the temperature is too high, the control valve is opened to allow the cooling medium to enter the cooling pipe to absorb the waste heat of the receiver, thereby preventing the receiver from being damaged due to excessive temperature; when the receiver temperature is normal and the Stirling generator is needed to generate electricity, the control valve is closed to reduce the flow of the cooling medium and allow the receiver to fully absorb heat.

[0011] The improved heat and power cogeneration method based on the Stirling engine receiver provided by the present invention may also have the following characteristics: wherein, the opening of the control valve is adjusted to control the flow of the cooling medium, thereby achieving an improved effect of the heat and power cogeneration.

[0012] The improved cogeneration method based on the Stirling engine receiver provided by the present invention may also have the following characteristics: the cooling medium that absorbs the waste heat is recycled and utilized for high-grade thermal energy, and the cooling water discharged from the cold end of the Stirling engine is utilized for low-grade thermal energy.

[0013] The present invention also provides an application of an improved cogeneration system based on a Stirling engine receiver in a dish-type Stirling solar thermal power generation system.

[0014] Functions and Effects of the Invention

[0015] The improved cogeneration system, method and application based on the Stirling engine receiver involved in the present invention include: a cooling pipe, which is spirally wound around the circumference of the receiver along the axial direction of the receiver, and the cooling pipe is a hollow pipe with a cooling medium inlet and a cooling medium outlet at both ends, respectively, and the cooling medium inlet and the cooling medium outlet are used to pass the cooling medium in and out respectively; a control valve is arranged on the cooling pipe, and is used to control the circulation of the cooling medium in the cooling pipe and adjust the flow rate and flow of the cooling medium, wherein the receiver is arranged on the Stirling engine, and is used to receive solar radiation to generate heat and drive the Stirling engine to do work.

[0016] Therefore, the improved cogeneration system, method and application based on the Stirling engine receiver of the present invention can achieve the cogeneration performance of the Stirling receiver, prevent it from being damaged by high temperature, extend its service life, and allow the Stirling generator to generate electricity more efficiently, with better practical application effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 4 is a front view of the improved heat and power cogeneration system based on the Stirling engine receiver in the embodiment of the present invention when it is applied to the dish-type Stirling solar thermal power generation system;

[0018] Figure 2 is a side view of an improved heat and power cogeneration system based on a Stirling engine receiver in an embodiment of the present invention when applied to a dish-type Stirling solar thermal power generation system;

[0019] Figure 3 It is a top view of the improved heat and power cogeneration system based on the Stirling engine receiver in an embodiment of the present invention when it is applied to a dish-type Stirling solar thermal power generation system. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following embodiments, in conjunction with the accompanying drawings, specifically illustrate an improved cogeneration system, method and application based on a Stirling engine receiver of the present invention.

[0021] <Example>

[0022] Figure 1 4 is a front view of the improved heat and power cogeneration system based on the Stirling engine receiver in the embodiment of the present invention when it is applied to the dish-type Stirling solar thermal power generation system; Figure 2 is a side view of an improved heat and power cogeneration system based on a Stirling engine receiver in an embodiment of the present invention when applied to a dish-type Stirling solar thermal power generation system; Figure 3 It is a top view of the improved heat and power cogeneration system based on the Stirling engine receiver in an embodiment of the present invention when it is applied to a dish-type Stirling solar thermal power generation system.

[0023] like Figures 1 to 3 As shown, this embodiment provides an improved cogeneration system 100 based on a Stirling engine receiver and its application in a dish-type Stirling solar thermal power generation system 200.

[0024] The dish-type Stirling solar thermal power generation system 200 includes a Stirling generator 10 , a cold end 20 , a heat preservation device 30 and a receiver 40 .

[0025] The cold end 20 is arranged on the Stirling generator 10. A cooling channel (not shown) is provided inside the cold end 20. The two ends of the cooling channel are respectively a cooling water inlet 20a and a cooling water outlet 20b, which are used to pass cooling water in and out respectively. The cooling water passed out is used to utilize low-grade thermal energy, thereby improving the overall efficiency of the dish-type Stirling solar thermal power generation system 200. Efficiency, to achieve cascade utilization of energy.

[0026] The heat preservation device 30 is disposed on the cold end 20 , and the cold end 20 is located between the heat preservation device 30 and the Stirling generator 10 .

[0027] The receiver 40 is a copper truncated cone-shaped structure, and its narrow side is connected to the heat preservation device 30, so that the heat preservation device 30 is located between the cold end 20 and the receiver 40. The receiver 40 is used to receive solar radiation to generate heat and drive the Stirling engine to work, so that the Stirling generator 10 generates electricity.

[0028] The Stirling engine receiver-based cogeneration improvement system 100 includes a cooling pipe 50 and a control valve 60 .

[0029] The cooling tube 50 is a copper hollow tube, which is spirally wound around the circumference of the truncated cone shape of the receiver 40 along the axial direction. The cooling tube 50 and the receiver 40 are spirally embedded and wound to match each other, and the ratio of the inner diameter of the spiral shape of the cooling tube 50 to the outer diameter of the truncated cone shape of the receiver 40 is 1:1.

[0030] The cooling tube 50 has a cooling medium inlet 50a and a cooling medium outlet 50b at both ends, respectively. The cooling medium inlet 50a and the cooling medium outlet 50b are used for introducing and discharging the cooling medium, respectively.

[0031] In this embodiment, the cooling medium inlet 50 a is an end of the cooling tube 50 away from the Stirling generator 10 , and the cooling medium outlet 50 b is an end of the cooling tube 50 close to the Stirling generator 10 .

[0032] The control valve 60 is disposed on the cooling pipe 50 and is used to control the flow of the cooling medium in the cooling pipe 50 and adjust the flow rate and flow rate of the cooling medium.

[0033] This embodiment also provides a Stirling engine receiver-based cogeneration improvement method, which uses the Stirling engine receiver-based cogeneration improvement system 100 in this embodiment. The specific method is as follows:

[0034] S01, when the receiver 40 continues to absorb heat and the temperature is too high, open the control valve 60 to allow the cooling medium to enter the cooling pipe 50 to absorb the residual heat of the receiver 40, thereby preventing the receiver 40 from being damaged due to excessive temperature; or increase the opening of the control valve 60 to increase the flow rate of the cooling medium and achieve an improved effect of cogeneration.

[0035] S02, when the temperature of the receiver 40 is normal and the Stirling generator 10 is needed to generate electricity, the control valve 60 is closed to reduce the flow of the cooling medium to allow the receiver 40 to fully absorb heat; or the opening of the control valve 60 is reduced to reduce the flow of the cooling medium to achieve an improved effect of cogeneration.

[0036] S03, recycle the cooling medium that absorbs the waste heat to utilize high-grade thermal energy; utilize low-grade thermal energy from the cooling water outlet 20b of the cold end 20 to improve the overall efficiency of the dish-type Stirling solar thermal power generation system 200. Efficiency, realizing cascade utilization of energy

[0037] Functions and Effects of the Embodiments

[0038] According to the present embodiment, an improved cogeneration system based on a Stirling engine receiver is provided, which includes: a cooling pipe, which is spirally wound around the circumference of the receiver along the axial direction of the receiver, and the cooling pipe is a hollow pipe with a cooling medium inlet and a cooling medium outlet at both ends, respectively, and the cooling medium inlet and the cooling medium outlet are used to pass the cooling medium in and out respectively; a control valve is arranged on the cooling pipe, and is used to control the circulation of the cooling medium in the cooling pipe and adjust the flow rate and flow of the cooling medium, wherein the receiver is arranged on the Stirling engine, and is used to receive solar radiation to generate heat and drive the Stirling engine to do work.

[0039] Therefore, the improved cogeneration system, method and application based on the Stirling engine receiver of this embodiment can achieve the cogeneration performance of the Stirling receiver, prevent it from being damaged by high temperature, extend its service life, and allow the Stirling generator to generate electricity more efficiently, with better practical application effects.

[0040] Furthermore, the receiver is truncated cone-shaped, and its narrow side is connected to the Stirling engine. The cooling pipe is spirally embedded and wound with the receiver, and the ratio of the spiral inner diameter of the cooling pipe to the outer diameter of the truncated cone-shaped receiver is 1:1. Such an arrangement makes the heat exchange efficiency of the cooling pipe higher.

[0041] Furthermore, the cooling medium inlet is the end of the cooling pipe away from the Stirling engine, and the cooling medium outlet is the end of the cooling pipe close to the Stirling engine. This arrangement allows the cooling pipe to dissipate heat from the receiver more effectively.

[0042] Furthermore, the receiver and / or the cooling tube are made of copper, so that the cooling tube has a good heat conduction efficiency.

[0043] This embodiment also provides an improved method for combined heat and power generation based on a Stirling engine receiver. Because the improved combined heat and power generation system based on a Stirling engine receiver in this embodiment is used, the cooling pipe is spirally wound around the circumference of the receiver. When the receiver continues to absorb heat and the temperature is too high, the control valve is opened to allow the cooling medium to enter the cooling pipe to absorb the waste heat of the receiver, thereby preventing the receiver from being damaged due to excessive temperature. When the temperature of the receiver is normal and the Stirling generator is required to generate electricity, the control valve is closed to reduce the flow of the cooling medium and allow the receiver to fully absorb heat. The opening of the control valve is adjusted to control the flow of the cooling medium, thereby achieving the improved effect of combined heat and power generation. The cooling medium that absorbs the waste heat is recycled and utilized for high-grade thermal energy; the cooling water discharged from the cooling water outlet of the cold end is utilized for low-grade thermal energy.

[0044] Therefore, the improved cogeneration method based on the Stirling engine receiver in this embodiment can achieve the cogeneration performance of the Stirling receiver, prevent it from being damaged by high temperature, extend its service life, and allow the Stirling generator to generate electricity more efficiently, with better practical application effects.

[0045] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An improved cogeneration system based on a Stirling engine receiver, characterized in that: include: A cooling pipe is spirally wound around the receiver along the axial direction of the receiver, and the cooling pipe is a hollow pipe with a cooling medium inlet and a cooling medium outlet at both ends, respectively, and the cooling medium inlet and the cooling medium outlet are used to pass the cooling medium in and out respectively; A control valve is provided on the cooling pipe and is used to control the circulation of the cooling medium in the cooling pipe and adjust the flow rate and flow of the cooling medium. The receiver is arranged on the Stirling engine to receive solar radiation to generate heat and drive the Stirling engine to do work.

2. The improved cogeneration system based on Stirling engine receiver according to claim 1, characterized in that: in, The receiver is in the shape of a truncated cone, and its narrow side is connected to the Stirling engine. The cooling tube is matched with the receiver and is spirally embedded and wound, and the ratio of the spiral inner diameter of the cooling tube to the outer diameter of the truncated cone-shaped receiver is 1:

1.

3. The improved heat and power cogeneration system based on Stirling engine receiver according to claim 1, characterized in that: in, The cooling medium inlet is an end of the cooling pipe away from the Stirling engine, and the cooling medium outlet is an end of the cooling pipe close to the Stirling engine.

4. The improved cogeneration system based on Stirling engine receiver according to claim 1, characterized in that: in, The receiver and / or the cooling tube are made of copper.

5. An improved method for cogeneration of heat and power based on a Stirling engine receiver, characterized in that: An improved heat and power cogeneration system based on a Stirling engine receiver as described in any one of claims 1 to 4 is used, The cooling pipe is spirally wound around the receiver. When the receiver continues to absorb heat and the temperature is too high, the control valve is opened to allow the cooling medium to enter the cooling pipe to absorb the residual heat of the receiver, thereby preventing the receiver from being damaged due to excessive temperature. When the temperature of the receiver is normal and the Stirling generator is needed to generate electricity, the control valve is closed to reduce the flow of the cooling medium so that the receiver can fully absorb heat.

6. The improved method for cogeneration based on Stirling engine receiver according to claim 5, characterized in that: in, The opening of the control valve is adjusted to control the flow of the cooling medium, thereby achieving an improved effect of combined heat and power generation.

7. The improved method for cogeneration of heat and power based on a Stirling engine receiver according to claim 5, characterized in that: in, The cooling medium that absorbs the waste heat is recycled and utilized to obtain high-quality thermal energy. The low-grade thermal energy of the cooling water discharged from the cold end of the Stirling engine is utilized.

8. Application of the improved cogeneration system based on Stirling engine receiver as described in any one of claims 1 to 4 in a dish-type Stirling solar thermal power generation system.

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