A solar gas turbine power generation system based on photothermal principle

Abstract

The present invention provides a solar gas turbine power generation system based on the principle of photothermal, comprising: a gas turbine, a solar energy collection device and a solar energy reflector; wherein the gas turbine comprises an air compressor impeller, a turbine, a regenerator and a combustion chamber, the regenerator comprises an outer shell, a middle shell and an inner shell, a low-temperature air intake passage is formed between the middle shell and the outer shell, a high-temperature air intake passage is formed between the middle shell and the inner shell, the inlet and outlet of the low-temperature air intake passage are respectively connected to the outlet of the air compressor impeller and the inlet of the combustion chamber, and the inlet and outlet of the high-temperature air intake passage are respectively connected to the outlet of the turbine and the outside; the solar energy collection device comprises a heat absorbing plate, and the heat absorbing plate is coated on the outer shell of the regenerator. The present invention can realize the combined cycle of solar energy and gas turbine, and the energy utilization rate is higher than that of single solar power generation or gas turbine power generation, thereby realizing efficient energy utilization.

Description

Technical Field

[0001] The present invention relates to the technical field of energy recovery and utilization, and in particular to a solar gas turbine power generation system based on the photothermal principle. Background Art

[0002] Solar energy is a clean, pollution-free renewable energy source. Its development and utilization are of great significance to alleviating the current pressure of fossil energy consumption and environmental pollution.

[0003] Solar thermal power generation technology is a technology that converts solar thermal energy into electrical energy. There are four main types of solar focusing: dish, tower, trough and Fresnel. The direct thermal power generation efficiency of solar thermal power generation technology is low, generally around 20%, and a large amount of light-heat conversion energy is not utilized. In addition, a single solar thermal power generation system cannot provide sufficient energy at night or on rainy days. Therefore, the power generation technology combining solar energy with other power generation systems has received more and more attention. Among them, the combination with the gas turbine power generation system can not only improve the overall power generation capacity and power generation stability of the system, but also has higher efficiency.

[0004] Gas turbine power generation system has a series of advantages such as high efficiency, fast start-up, good peak load performance, short construction period, small footprint, low water consumption and low environmental pollution. However, due to the supply of fuels such as natural gas, gas turbine power generation technology is restricted to a certain extent. Therefore, under the condition of ensuring system efficiency and power, minimizing fuel consumption is conducive to the wider promotion of gas turbine power generation system. In addition, another major advantage of combining solar thermal collection with gas turbine power generation system is that the radiation energy of the sun is used to replace part of the required fuel heat energy, thereby reducing the amount of fuel required by the gas turbine power generation system.

[0005] In addition, most of the reflectors in current solar power generation systems are fixedly installed, and sunlight is absorbed by the reflectors fixed at a certain angle. Although the angle is the optimal angle calculated, since the reflectors are fixed and the sun is rotating, there is a problem that the sun does not always shine directly on the reflectors. When the sun shines obliquely on the reflectors, the reflected sunlight is less, so that solar energy cannot be fully utilized, resulting in energy waste. Summary of the invention

[0006] In order to solve the above technical problems, the purpose of the present invention is to provide a solar gas turbine power generation system based on the photothermal principle, which can realize the combined cycle of solar energy and gas turbine, and the energy utilization rate is higher than that of single solar power generation or gas turbine power generation, thereby realizing efficient utilization of energy.

[0007] The technical solution of the present invention is as follows:

[0008] A solar gas turbine power generation system based on the photothermal principle comprises: a gas turbine, a solar energy collection device and a solar energy reflector; the gas turbine is fixed above the solar energy reflector by a fixing rod;

[0009] The gas turbine comprises an air compressor impeller, a turbine, a regenerator and a combustion chamber, the regenerator comprises an outer shell, a middle shell and an inner shell, a low-temperature air intake passage is formed between the middle shell and the outer shell, a high-temperature air intake passage is formed between the middle shell and the inner shell, an inlet and an outlet of the low-temperature air intake passage are respectively connected to the outlet of the air compressor impeller and the inlet of the combustion chamber, and an inlet and an outlet of the high-temperature air intake passage are respectively connected to the outlet of the turbine and the outside;

[0010] The solar energy collection device comprises a heat absorbing plate, which is coated on the outer shell of the heat regenerator and is located on the reflection focusing point or focusing line of the solar reflector.

[0011] Furthermore, the outer shell, the middle shell and the inner shell are arranged parallel to each other from the outside to the inside;

[0012] A plurality of fins are arranged inside the shell, each of the fins is arranged along the length direction of the heat regenerator, and one end of the fin is fixed inside the shell.

[0013] Furthermore, the outer shell, the middle shell and the inner shell are coaxial and cylindrically arranged from the outside to the inside;

[0014] Each of the fins is arranged in a radial shape in the casing along the length direction of the gas turbine, and each of the fins is arranged along the radial direction of the casing.

[0015] Furthermore, the outer shell, the middle shell and the inner shell are coaxial and arranged from the outside to the inside in a square tube shape;

[0016] The fins are arranged in each plate surface of the outer shell along the length direction of the gas turbine, and each fin is arranged perpendicular to the outer shell.

[0017] Furthermore, the solar reflector has a larger area near the head of the gas turbine and a smaller area near the tail of the gas turbine.

[0018] Furthermore, it also includes a mounting platform, the solar reflector is mounted on the mounting platform through an adjustment device, and the adjustment device includes a telescopic rod, a hinge, a base, an expansion bottle and a pipeline;

[0019] A plurality of bases are fixed on the top of the mounting platform, wherein the bases are an even number and are symmetrically arranged in pairs, and the bases are connected to telescopic rods through hinges, and the telescopic rods are connected to the bottom of the solar reflector;

[0020] An expansion bottle is fixed on the top surface of the mounting platform outside each base. The expansion bottle is connected to the telescopic rod of the base on the opposite side through a pipeline. When the expansion bottle is heated, the telescopic rod on the opposite side can be extended to lift the solar reflector on that side.

[0021] Furthermore, the telescopic rod comprises a top rod and a sleeve rod, the bottom of the sleeve rod is hingedly arranged on the base, the bottom of the top rod is inserted into the sleeve rod and slidably cooperates with the sleeve rod, and the top of the top rod is connected to the bottom of the solar reflector;

[0022] The expansion bottle is filled with an expansion liquid. When the expansion bottle is heated, the expansion liquid expands and lifts up the push rod connected to the expansion bottle.

[0023] Furthermore, the bases are evenly distributed along a circumference, and the telescopic rods are evenly distributed along a corresponding circumference.

[0024] Furthermore, the base and the telescopic rods are arranged in two symmetrical rows along the mounting platform.

[0025] Furthermore, the expansion bottle is embedded in the bottle seat, and the bottle seat is fixedly mounted on the mounting platform.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention uses the principle of combining solar energy and gas turbines. By covering the heat-absorbing plate that receives sunlight on the outer shell of the gas turbine regenerator to heat the working medium, the energy utilization efficiency can be improved; and through the reasonable layout of the regenerator structure, through the coordination of the air compressor impeller, turbine, regenerator and combustion chamber, the heat generated by each link in the system can be recycled, and the energy recovery efficiency is high.

[0028] 2. The heat exchanger structure proposed in the present invention can improve the heat exchange efficiency of the working medium through the low-temperature air inlet channel and the high-temperature air inlet channel. Since the fin is only fixed to the shell at one end and the other end does not need to be fixed and sealed, the manufacturing difficulty of the heat exchanger is greatly reduced.

[0029] 3. The present invention can solve the problem of temperature drop from the front end to the rear end due to the long heat absorption plate by using the solution that the solar reflector has a larger area near the head of the gas turbine and a smaller area near the tail of the gas turbine.

[0030] 4. The present invention does not consume electric energy in the entire process of tracking solar energy, and the tracking is more accurate, which can achieve higher energy utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the working principle of the solar gas turbine power generation system of the present invention.

[0032] Figure 2 This is a schematic diagram of the side structure of a heat regenerator according to an embodiment of the present invention.

[0033] Figure 3 This is a schematic diagram of the main structure of a heat regenerator according to an embodiment of the present invention.

[0034] Figure 4 This is a schematic diagram of the side structure of a heat regenerator according to another embodiment of the present invention.

[0035] Figure 5 This is a schematic diagram of the main structure of a heat regenerator according to another embodiment of the present invention.

[0036] Figure 6 The figure is a schematic diagram of the structure of tracking sunlight according to an embodiment of the present invention.

[0037] Figure 7 A top view of a sunlight tracking structure according to an embodiment of the present invention.

[0038] Figure 8 FIG. 4 is a schematic diagram of the structure of tracking sunlight according to another embodiment of the present invention.

[0039] Fig. 9 A top view of a sunlight tracking structure according to another embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to better understand the technical solution of the present invention, the present invention is further described below in conjunction with specific embodiments and the accompanying drawings of the specification.

[0041] like Figure 1 The above-mentioned solar gas turbine power generation system based on the photothermal principle provided in the embodiment of the present invention includes a gas turbine 1, a solar reflector 2 and a solar energy collection device 21.

[0042] The gas turbine 1 of the present invention includes an air compressor impeller 102 , a turbine 104 , a regenerator 101 and a combustion chamber 105 .

[0043] The gas turbine 1 is fixed above the solar reflector 2 by means of a fixing rod 5, and the solar energy collecting device 21 is located on the sunlight reflection focusing point (for a dish reflector) or the focusing line (for a trough reflector). Specifically, the solar energy collecting device 21 includes a heat absorbing plate arranged on the gas turbine 1, and the heat absorbing plate is coated on the outer shell of the regenerator 101, and can also serve as part or all of the outer shell of the regenerator 101.

[0044] As an embodiment of the present invention, see Figure 2 , 3The regenerator 101 of the gas turbine includes a coaxial cylindrical outer shell, a middle shell and an inner shell from outside to inside. The heat absorbing plate is covered on the outer shell. A plurality of fins 1011 are arranged on the inner side of the outer shell along the length direction of the gas turbine 1. Each of the fins 1011 is radially distributed and one end of a single fin 1011 is fixed in the outer shell, and the other end is suspended, with a gap between the middle shell. A low-temperature air intake passage 1012 is formed between the middle shell and the outer shell. The function of the fins 1011 is to increase the heat dissipation area. The heat of the heat absorbing plate can be fully transferred through the outer shell and the fins 1011, so that the temperature in the low-temperature air intake passage 1012 is pre-increased; a high-temperature air intake passage 1013 is formed between the middle shell and the inner shell; the inlet and outlet of the low-temperature air intake passage 1012 are respectively connected to the outlet of the air compressor impeller 102 and the inlet of the combustion chamber 105, and the inlet and outlet of the high-temperature air intake passage 1013 are respectively connected to the outlet of the turbine 104 and the outside atmosphere or other waste heat recycling equipment.

[0045] The high-temperature gas in the combustion chamber 105 drives the turbine 104 to work and then flows into the high-temperature intake passage 1013. The compressed gas is discharged from the compressor impeller 102 into the low-temperature intake passage 1012. After the high-temperature gas and the low-temperature gas exchange heat, the low-temperature gas enters the combustion chamber 105 from the low-temperature intake passage 1012 for combustion. By increasing the temperature of the gas entering the combustion chamber 105, the fuel utilization rate is improved. The high-temperature gas is exhausted through the high-temperature intake passage 1013, and the gas can be discharged to the atmosphere or further participate in the waste heat recovery cycle.

[0046] As another embodiment of the present invention, see Figure 4 , 5 The gas turbine regenerator 101 includes a square cylindrical outer shell, a middle shell and an inner shell which are parallel to each other and arranged from outside to inside. The heat absorbing plate is covered on the outer shell. The fins 1011 are parallel to each other and arranged along the length direction of the regenerator 101, and one end of a single fin 1011 is fixed in the outer shell. A low-temperature air inlet passage 1012 is formed between the middle shell and the outer shell. The function of the fins 1011 is to increase the heat dissipation area. The heat of the heat absorbing plate can be fully transferred through the outer shell and the fins 1011, so that the temperature in the low-temperature air inlet passage 1012 is pre-increased; a high-temperature air inlet passage 1013 is formed between the middle shell and the inner shell. The inlet and outlet of the low-temperature air inlet passage 1012 are respectively connected to the outlet of the air compressor impeller 102 and the inlet of the combustion chamber 105, and the inlet and outlet of the high-temperature air inlet passage 1013 are respectively connected to the outlet of the turbine 104 and the outside atmosphere or other waste heat recycling equipment.

[0047] The high-temperature gas in the combustion chamber 105 drives the turbine 104 to do work and then flows into the high-temperature air intake passage 1013. The compressed gas is discharged from the air compressor impeller 102 of the compressor into the low-temperature air intake passage 1012. After the high-temperature gas and the low-temperature gas exchange heat, the low-temperature gas enters the combustion chamber 105 from the low-temperature air intake passage 1012 for combustion. The high-temperature gas is exhausted through the high-temperature air intake passage 1013. The gas can be discharged into the atmosphere or further participate in the waste heat recovery cycle.

[0048] The specific working process of the solar gas turbine power generation system based on the photothermal principle in the above embodiment of the present invention is as follows:

[0049] The gas enters the air compressor impeller 102, and after being compressed, enters the inlet of the low-temperature air inlet channel 1012 of the regenerator 101; the gas temperature in the regenerator 101 is 500℃-600℃; the gas flowing out from the outlet of the low-temperature air inlet channel 1012 of the regenerator 101 enters the combustion chamber 105 for combustion, and the high-temperature gas after combustion enters the turbine 104, which drives the motor 103 to generate electricity, and the gas from the outlet of the turbine 104 enters the inlet of the high-temperature air inlet channel 1013 of the regenerator 101, and after cooling in the regenerator 101, it is discharged to the outside from the outlet of the high-temperature air inlet channel 1013 of the regenerator 101; the temperature in the combustion chamber 105 is 800℃-950℃, preferably 900 degrees. Among them, the motor 103 is an integrated motor, which first acts as a motor to drive the air compressor impeller 102 to rotate, and then acts as a generator to generate electricity after accelerating to be able to operate independently.

[0050] Furthermore, since the heat absorbing plate is relatively long, especially when a trough reflector is used, the length of the heat absorbing plate and the trough reflector can reach 20 meters, and there is a temperature drop from the front end to the rear end, so the rear end needs more heat. To solve the above problem, in an embodiment of the present invention, a layout structure of a solar reflector 2 is provided: the area of ​​the reflector is increased in the rear end, that is, the area of ​​the solar reflector 2 near the head of the gas turbine 1 is large, and the area near the tail of the gas turbine 1 is small.

[0051] The solar reflector 2 of the present invention, see Figures 6 to 9 , is a reflector with a fixed focusing point, specifically, a dish-type solar reflector or a trough-type reflector can be selected; when a dish-type reflector is selected, the heat absorbing plate is located on the reflection focusing point of the reflector, and when a trough-type reflector is selected, the heat absorbing plate is located on the focusing line of the reflector.

[0052] Preferably, see Figures 6 to 9 , the present invention also includes a mounting platform 3 and an adjusting device.

[0053] The mounting platform 3 is a flat plate fixed on the ground or embedded in the ground, and a steel plate may be used.

[0054] For dish reflectors, see Figure 6The adjusting device includes a top rod 401, a sleeve rod 402, a hinge 403, a base 404, an expansion bottle 405, and a pipe 406.

[0055] A plurality of bases 404 are fixed on the top of the mounting platform 3. The bases 404 are an even number, symmetrically arranged in pairs, and distributed along a circumference (preferably, see Figure 7 , the base 404 is evenly distributed along the circumference), the base 404 is connected to the bottom of the solar reflector 2 through a telescopic rod, the telescopic rod includes a top rod 401 and a sleeve rod 402, the top rod 401 can slide in the sleeve rod 402, the bottom of the sleeve rod 402 is set on the base 404 through a hinge 403, the bottom of the top rod 401 is inserted into the sleeve rod 402, and the top is connected to the bottom of the solar reflector 2 (preferably, see Figure 7 , push rods 401 are evenly distributed along a circumference at the bottom of the solar reflector 2); an expansion bottle 405 is fixed on the top surface of the mounting platform 3 outside each base 404, and the expansion bottle 405 is filled with expansion liquid (optionally expansion kerosene), which is connected to the sleeve rod 402 on the base 404 on the opposite side through a pipeline 406. When the expansion bottle 405 is heated, the expansion oil expands and lifts up the push rod 401 on the opposite side, thereby raising the solar reflector 2 on the opposite side to absorb the light on the side with strong light.

[0056] Further, when the sunlight is just perpendicular to the ground, each expansion bottle 405 is heated to the same extent, and at this moment, the axis of the solar reflector 2 is perpendicular to the ground. Each expansion bottle 405 can be nested in the bottle holder 407, and the bottle holder 407 is fixed on the mounting platform 3.

[0057] See also Figure 6 In the structure of the adjusting device of this embodiment, assuming that the strong light is on the left side, the length of the telescopic rod on the right side is longer than that on the left side, and the right side of the solar reflector 2 is higher than the left side, so as to receive stronger light on the left side; otherwise, it can receive stronger light on the right side. Therefore, the power generation system of the present invention can realize automatic tracking of sunlight under the action of the adjusting device to ensure that the solar reflector 2 always receives the side with stronger light.

[0058] See also Figure 7 In the adjustment device structure of this embodiment, the telescopic rods are arranged in three pairs, and the solar reflector 2 can be adjusted from three angles. The telescopic rods can also be arranged in pairs of one pair, two pairs, four pairs, five pairs, etc. An integer number of pairs. The more telescopic rods are arranged, the more accurately the angle of the solar reflector 2 can be adjusted.

[0059] For slotted reflectors: see Figure 8 , 9 A plurality of bases 404 are fixed on the top of the mounting platform 3, and each base 404 is arranged in two symmetrical rows, and the rest is the same as the arrangement of the dish-type reflector.

[0060] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features have similar functions to those disclosed in the present application (but not limited to).

Claims

1. A solar gas turbine power generation system based on the principle of photothermal, characterized in that: include: A gas turbine, a solar energy collection device and a solar energy reflector; the gas turbine is fixed above the solar energy reflector by a fixing rod; The gas turbine includes an air compressor impeller, a turbine, a regenerator and a combustion chamber. The regenerator comprises an outer shell, a middle shell and an inner shell, a low-temperature air intake passage is formed between the middle shell and the outer shell, a high-temperature air intake passage is formed between the middle shell and the inner shell, an inlet and an outlet of the low-temperature air intake passage are respectively connected to the outlet of the air compressor impeller and the inlet of the combustion chamber, and an inlet and an outlet of the high-temperature air intake passage are respectively connected to the outlet of the turbine and the outside; The solar energy collection device comprises a heat absorbing plate, the heat absorbing plate is coated on the outer shell of the heat regenerator, and the heat absorbing plate is located on the reflection focusing point or focusing line of the solar reflector; Also included is a mounting platform, the solar reflector is mounted on the mounting platform through an adjustment device, the adjustment device includes a telescopic rod, a hinge, a base, an expansion bottle and a pipeline; A plurality of bases are fixed on the top of the mounting platform, the bases are multiple and symmetrically arranged in pairs, the bases are connected to telescopic rods through hinges, and the telescopic rods are connected to the bottom of the solar reflector; The telescopic rods are provided in three pairs, and the solar reflector can be adjusted from three angles; An expansion bottle is fixed on the top surface of the mounting platform outside each base. The expansion bottle is connected to the telescopic rod of the base on the opposite side through a pipeline. When the expansion bottle is heated, the telescopic rod on the opposite side can be extended to lift the solar reflector on that side.

2. The solar gas turbine power generation system based on the photothermal principle according to claim 1 is characterized in that: The outer shell, the middle shell and the inner shell are arranged parallel to each other from the outside to the inside; A plurality of fins are arranged inside the shell, each of the fins is arranged along the length direction of the heat regenerator, and one end of the fin is fixed inside the shell.

3. The solar gas turbine power generation system based on the photothermal principle according to claim 2 is characterized in that: The outer shell, the middle shell and the inner shell are coaxial and cylindrically arranged from the outside to the inside; Each of the fins is radially arranged in the casing along the length direction of the gas turbine, and each of the fins is arranged along the radial direction of the casing.

4. The solar gas turbine power generation system based on the photothermal principle according to claim 2 is characterized in that: The outer shell, the middle shell and the inner shell are coaxial and arranged from the outside to the inside in a square tube shape; The fins are arranged in each plate surface of the outer shell along the length direction of the gas turbine, and each fin is arranged perpendicular to the outer shell.

5. The solar gas turbine power generation system based on the photothermal principle according to claim 1 is characterized in that: The solar reflector has a larger area near the head of the gas turbine and a smaller area near the tail of the gas turbine.

6. The solar gas turbine power generation system based on the photothermal principle according to claim 1 is characterized in that: The telescopic rod comprises a top rod and a sleeve rod, the bottom of the sleeve rod is arranged on the base through a hinge, the bottom of the top rod is inserted into the sleeve rod and slidably cooperates with the sleeve rod, and the top of the top rod is connected to the bottom of the solar reflector; The expansion bottle is filled with an expansion liquid. When the expansion bottle is heated, the expansion liquid expands and lifts up the push rod connected to the expansion bottle.

7. The solar gas turbine power generation system based on the photothermal principle according to claim 1 is characterized in that: The bases are evenly distributed along a circumference, and the telescopic rods are evenly distributed along a corresponding circumference.

8. The solar gas turbine power generation system based on the photothermal principle according to claim 1 is characterized in that: The base and the telescopic rods are arranged in two symmetrical rows along the mounting platform.

9. The solar gas turbine power generation system based on the photothermal principle according to claim 1 is characterized in that: The expansion bottle is embedded in the bottle seat, and the bottle seat is fixedly mounted on the mounting platform.

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