Cyclic power generation system

Abstract

The invention discloses a circulating power generation system which comprises a first heat exchanger, a reduction reactor, an oxidation reactor, a second heat exchanger and a first gas turbine, the first heat exchanger is suitable for introducing steam, an oxygen carrier and air, and the reduction reactor is communicated with the first heat exchanger so that the heated oxygen carrier can flow into the reduction reactor; the reduction reactor is suitable for introducing methane, a reduction state oxygen carrier is stored in the oxidation reactor, the oxidation reactor is communicated with the first heat exchanger, and the second heat exchanger is communicated with the reduction reactor and the oxidation reactor, so that the reduction state oxygen carrier flowing out of the oxidation reactor heats reducing gas flowing out of the reduction reactor through the second heat exchanger; the first gas turbine communicates with the second heat exchanger. The circulating power generation system has the advantages of simple structure, high power generation efficiency and the like.

Description

Technical Field

[0001] The present invention relates to the field of power generation, and more particularly, to a combined cycle power generation system that utilizes redox reactions to improve the energy grade. Background Art

[0002] The gas-steam combined cycle power generation technology combines a top-layer gas turbine and a bottom-layer steam Rankine cycle to achieve efficient power generation. This technology has been highly regarded at home and abroad due to its high efficiency, low consumption, fast startup, flexible regulation, high availability, short construction period, and low pollution.

[0003] In related technologies, waste heat utilization in gas-steam combined cycles is carried out in the forms of waste heat heating, steam re-injection gas turbine waste heat utilization, and intake air heating by inner loop water waste heat of gas turbines. However, the above traditional bottom cycle low-grade waste heat utilization technology by changing the integration method has limited energy improvement and low utilization rate for gas-steam combined cycle units. Summary of the Invention

[0004] The present invention is made based on the inventor's discovery and recognition of the following facts and problems:

[0005] For example: Patent No. 201520510365.9, a waste heat utilization system for gas-steam combined cycle power generation, uses the flue gas of a waste heat boiler to heat the gas, reduces the flue gas temperature, and increases the output of the steam turbine. A hot water heat exchanger is installed at the tail of the waste heat boiler, and the high-temperature hot water enters the refrigerator as a heat source and then returns, forming a waste heat utilization loop for gas-steam combined cycle power generation, making full use of the waste heat of power generation. However, it still belongs to the bottom cycle low-grade waste heat utilization technology, and has limited effect on improving the energy utilization rate of gas-steam combined cycle units.

[0006] The present invention aims to solve at least one of the technical problems in the related technologies to some extent.

[0007] To this end, an embodiment of the present invention provides a cycle power generation system with high energy utilization rate and high improvement efficiency.

[0008] The circulating power generation system according to an embodiment of the present invention includes: a first heat exchanger adapted to introduce steam, an oxygen carrier, and air, so that the steam heats the oxygen carrier and the air through the first heat exchanger; a reduction reactor communicating with the first heat exchanger, so that the heated oxygen carrier flows into the reduction reactor, and the reduction reactor is adapted to introduce methane, so that the methane and the oxygen carrier undergo a reduction reaction to generate a reduced oxygen carrier and a reducing gas; an oxidation reactor storing the reduced oxygen carrier, and the oxidation reactor communicating with the first heat exchanger, so that the heated air and the reduced oxygen carrier undergo an oxidation reaction in the oxidation reactor to generate an oxygen carrier; a second heat exchanger communicating with the reduction reactor and the oxidation reactor, so that the reduced oxygen carrier flowing out of the oxidation reactor heats the reducing gas flowing out of the reduction reactor through the second heat exchanger; a first gas turbine communicating with the second heat exchanger, so that the reducing gas flowing out of the second heat exchanger flows into the first gas turbine to drive the first gas turbine to rotate.

[0009] The circulating power generation system according to an embodiment of the present invention is provided with a first heat exchanger, a reduction reactor, an oxidation reactor, a second heat exchanger, and a first gas turbine. The oxygen carrier is used to undergo a reduction reaction with methane in the reduction reactor, and the oxidation reactor oxidizes the reduced oxygen carrier to generate a large amount of heat energy. Moreover, the heat energy of the reduced oxygen carrier is absorbed through the second heat exchanger, and heat exchange is carried out in each heat exchanger to realize cascaded utilization of energy. The reducing gas generated by the oxidation-reduction reaction of the oxygen carrier is connected to the first gas turbine to do work, thereby improving the energy utilization rate of the gas turbine combined cycle system.

[0010] In some embodiments, the second heat exchanger communicates with the first heat exchanger, so that the oxygen carrier in the second heat exchanger flows into the first heat exchanger, and the steam in the first heat exchanger heats the oxygen carrier.

[0011] In some embodiments, the reduction reactor communicates with the oxidation reactor, so that the reduced oxygen carrier flowing out of the reduction reactor flows into the oxidation reactor.

[0012] In some embodiments, the circulating power generation system further includes: a first compressor communicating with the first heat exchanger, and the first compressor is adapted to introduce air, so that the first compressor compresses the air and flows it into the first heat exchanger; a second compressor communicating with the reduction reactor, and the second compressor is adapted to introduce methane, so that the second compressor compresses the methane and flows it into the reduction reactor.

[0013] In some embodiments, the circulating power generation system further includes: a third heat exchanger, which is connected to the first gas turbine so that the reducing gas flowing out of the first gas turbine flows into the third heat exchanger. The third heat exchanger is adapted to introduce water so that the reducing gas in the third heat exchanger heats the water into steam; a first steam turbine, which is connected to the third heat exchanger so that the steam flowing out of the third heat exchanger drives the first steam turbine to rotate.

[0014] In some embodiments, the circulating power generation system further includes a separator, which is connected to the third heat exchanger so that the reducing gas flowing out of the third heat exchanger flows into the separator to separate water and carbon dioxide in the reducing gas through the separator.

[0015] In some embodiments, the circulating power generation system further includes a second gas turbine, which is connected to the oxidation reactor so that the gas flowing out of the oxidation reactor drives the second gas turbine to rotate.

[0016] In some embodiments, the circulating power generation system further includes: a fourth heat exchanger, which is connected to the second gas turbine so that the gas flowing out of the second gas turbine flows into the fourth heat exchanger. The fourth heat exchanger is adapted to introduce water so that the gas in the fourth heat exchanger heats the water into steam; a second steam turbine, which is connected to the fourth heat exchanger so that the steam flowing out of the fourth heat exchanger drives the second steam turbine to rotate.

[0017] In some embodiments, the first heat exchanger is adapted to be connected to the high-pressure cylinder and the intermediate-pressure cylinder of the steam turbine so that the high-pressure steam flowing out of the high-pressure cylinder and the intermediate-pressure steam flowing out of the intermediate-pressure cylinder flow into the first heat exchanger, and the temperature of the steam introduced into the first heat exchanger is 350 °C.

[0018] In some embodiments, the circulating power generation system further includes a generator, which is connected to the first gas turbine so that the first gas turbine drives the generator to generate electricity. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the circulating power generation system according to an embodiment of the present invention.

[0020] 100. Circulating power generation system; 1. First compressor; 2. First heat exchanger; 3. Second compressor; 4. Reduction reactor; 5. Second heat exchanger; 6. First gas turbine; 7. Third heat exchanger; 8. Separator; 9. First steam turbine; 10. Oxidation reactor; 11. Second gas turbine; 12. Fourth heat exchanger; 13. Second steam turbine; 14. Intermediate-pressure cylinder; 15. High-pressure cylinder. Detailed Embodiments

[0021] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] A circulating power generation system 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0023] As Figure 1 shown, the circulating power generation system 100 according to an embodiment of the present invention includes a first heat exchanger 2, a reduction reactor 4, an oxidation reactor 10, a second heat exchanger 5, and a first gas turbine 6.

[0024] The first heat exchanger 2 is adapted to introduce steam, an oxygen carrier, and air so that the steam heats the oxygen carrier and air through the first heat exchanger 2. Specifically, as Figure 1 shown, the first heat exchanger 2 has a first channel, a second channel, and a third channel that exchange heat with each other. The first channel can introduce steam, the second channel can introduce an oxygen carrier (for example: LaCu 0.1 Ni 0.9 O 3 ), and the third channel can introduce air so that the steam heats the oxygen carrier and air.

[0025] The reduction reactor 4 is connected to the first heat exchanger 2 so that the heated oxygen carrier flows into the reduction reactor 4. The reduction reactor 4 is adapted to introduce methane so that methane and the oxygen carrier undergo a reduction reaction to generate a reduced oxygen carrier and reduction gas. Specifically, as Figure 1 shown, the inlet of the reduction reactor 4 is connected to the outlet of the second channel of the first heat exchanger 2 so that the heated oxygen carrier flows into the reduction reactor 4, and the reduction reactor 4 can introduce methane so that methane and the oxygen carrier undergo a reduction reaction in the reduction reactor 4, causing the oxygen carrier to be reduced to a reduced oxygen carrier (for example: LaCu 0.1 Ni 0.9 0 2.34 ), and methane generates reduction gas (the reduction gas contains carbon dioxide and water).

[0026] The oxidation reactor 10 stores a reduced oxygen carrier. The oxidation reactor 10 is connected to the first heat exchanger 2 so that the heated air and the reduced oxygen carrier undergo an oxidation reaction in the oxidation reactor 10 to generate an oxygen carrier. Specifically, as Figure 1 shown, the inlet of the oxidation reactor 10 is connected to the outlet of the third channel of the first heat exchanger 2. The air heated by the first heat exchanger 2 flows into the oxidation reactor 10, and the oxygen in the air and the reduced oxygen carrier undergo an oxidation reaction to regenerate the oxygen carrier, causing the reduced oxygen carrier to be re-oxidized into the oxygen carrier and releasing a large amount of heat energy.

[0027] The second heat exchanger 5 is connected to the reduction reactor 4 and the oxidation reactor 10 so that the reduced oxygen carrier flowing out of the oxidation reactor 10 heats the reducing gas flowing out of the reduction reactor 4 through the second heat exchanger 5. Specifically, as Figure 1 shown, the second heat exchanger 5 has a first flow channel and a second flow channel for heat exchange. The inlet of the first flow channel is connected to the outlet of the reduction reactor 4, and the regenerated oxygen carrier in the reduction reactor 4 flows into the first flow channel. The inlet of the second flow channel is connected to the outlet of the oxidation reactor 10, and the reducing gas in the oxidation reactor 10 flows into the second flow channel. Thus, the oxygen carrier heats the reducing gas through the second heat exchanger 5.

[0028] The first gas turbine 6 is connected to the second heat exchanger 5 so that the reducing gas flowing out of the second heat exchanger 5 flows into the first gas turbine 6 to drive the first gas turbine 6 to rotate. Specifically, as Figure 1 shown, work is done in the turbine of the first gas turbine 6, and the outlet of the second flow channel of the second heat exchanger 5 is connected to the turbine of the first steam turbine 9, so that the reducing gas flowing out of the second heat exchanger 5 drives the turbine to rotate.

[0029] In the circulating power generation system 100 according to the embodiment of the present invention, the first heat exchanger 2, the reduction reactor 4, the oxidation reactor 10, the second heat exchanger 5 and the first gas turbine 6 are provided. By using the oxygen carrier to undergo a reduction reaction with methane in the reduction reactor 4, the low-grade heat energy of the bottom cycle can be converted into the chemical energy of the oxygen carrier, achieving the conversion of the energy grade from low to high. A large amount of heat energy is generated through the oxidation reaction of the reduced oxygen carrier in the oxidation reactor 10, and the heat energy of the reduced oxygen carrier is absorbed by the second heat exchanger 5, making the energy utilization and grade coupling more reasonable. Through the system integration design, heat exchange of each heat exchanger is carried out to achieve cascaded utilization of energy. The reducing gas generated by the oxidation-reduction reaction of the oxygen carrier is connected to the turbine of the first gas turbine 6 to do work, which can further improve the energy utilization rate of the gas turbine combined cycle system.

[0030] In some embodiments, the second heat exchanger 5 is connected to the first heat exchanger 2 so that the oxygen carrier in the second heat exchanger 5 flows into the first heat exchanger 2 to enable the steam of the first heat exchanger 2 to heat the oxygen carrier. Specifically, as Figure 1As shown, the outlet of the first flow channel of the second heat exchanger 5 is communicated with the inlet of the second channel of the first heat exchanger 2, so that the oxygen carrier after cooling in the first flow channel of the second heat exchanger 5 flows into the second channel of the first heat exchanger 2, thereby enabling the cooled oxygen carrier to be heated through the first heat exchanger 2 to form a closed-loop cycle. Thus, after the reduced oxygen carrier releases heat energy in the oxidation reactor 10, it exchanges heat through the second heat exchanger 5, is cooled and then flows back to the first heat exchanger 2 to be reheated, so that the heat energy carried by the oxygen carrier is fully utilized and energy waste is reduced. At the same time, the steam in the first heat exchanger 2 also continuously provides heat energy for the oxygen carrier, ensuring the stable operation and efficient power generation of the system. Secondly, the closed-loop cycle design enables the oxygen carrier in the system to be continuously recycled, avoiding system fluctuations caused by insufficient or excessive oxygen carrier, helping to maintain the temperature and pressure stability of each component in the system, and thus improving the stability and reliability of the entire system. In addition, the closed-loop cycle reduces the requirements for oxygen carrier replenishment and discharge, thereby simplifying the operation process, enabling the operator to only focus on the overall operation state of the system without frequently adjusting parameters such as the quantity and temperature of the oxygen carrier. Finally, the continuous recycling of the oxygen carrier reduces its consumption and replacement requirements, thereby reducing the operating cost. At the same time, due to the improvement of system stability and reliability, the maintenance and replacement costs caused by fault shutdowns are also reduced.

[0031] In some embodiments, the reduction reactor 4 is communicated with the oxidation reactor 10 so that the reduced oxygen carrier flowing out of the reduction reactor 4 flows into the oxidation reactor 10. Specifically, as Figure 1 shown, the outlet of the reduction reactor 4 is communicated with the inlet of the oxidation reactor 10, so that the reduced oxygen carrier flows into the oxidation reactor 10 for an oxidation reaction to generate an oxygen carrier. Thus, the reduction reactor 4 provides the reduced oxygen carrier for the oxidation reactor 10, enabling the reduced oxygen carrier to circulate between the reduction reactor 4, the oxidation reactor 10, the first heat exchanger 2 and the second heat exchanger 5, and the oxygen carrier continuously converts between reduction and oxidation reactions, continuously providing heat energy for the system, thereby improving the energy utilization efficiency of the entire system.

[0032] In some embodiments, the circulating power generation system 100 further includes a first compressor 1 and a second compressor 3.

[0033] The first compressor 1 is communicated with the first heat exchanger 2, and the first compressor 1 is adapted to introduce air so that the first compressor 1 compresses the air and flows it into the first heat exchanger 2. Specifically, as Figure 1As shown, the outlet of the first compressor 1 is connected to the inlet of the first channel of the first heat exchanger 2. The first compressor 1 can be used to introduce air, so that the first compressor 1 compresses the air. The first compressor 1 provides a high-pressure and high-density air source for the entire system, which helps to improve the overall efficiency of the system. At the same time, the high-pressure air can transfer heat more effectively during the heat exchange process, thereby optimizing the thermal performance of the system.

[0034] The second compressor 3 is connected to the reduction reactor 4. The second compressor 3 is suitable for introducing methane, so that the second compressor 3 compresses the methane and flows into the reduction reactor 4. Specifically, as Figure 1 shown, the outlet of the second compressor 3 is connected to the inlet of the reduction reactor 4. The second compressor 3 can be used to introduce methane, so that the second compressor 3 compresses the methane to meet the pressure in the reduction reactor 4 and ensure that the oxygen carrier undergoes a reduction reaction.

[0035] In some embodiments, the circulating power generation system 100 further includes a third heat exchanger 7 and a first steam turbine 9.

[0036] The third heat exchanger 7 is connected to the first gas turbine 6, so that the reduced gas flowing out of the first gas turbine 6 flows into the third heat exchanger 7. The third heat exchanger 7 is suitable for introducing water, so that the reduced gas in the third heat exchanger 7 heats the water into steam. The first steam turbine 9 is connected to the third heat exchanger 7, so that the steam flowing out of the third heat exchanger 7 drives the first steam turbine 9 to rotate. Specifically, as Figure 1 shown, the third heat exchanger 7 has a first pipe and a second pipe for heat exchange. Water can be introduced into the first pipe. The inlet of the second pipe is connected to the outlet of the first gas turbine 6, so that the reduced gas (the steam and carbon dioxide after the first gas turbine 6 does work) flowing out of the first gas turbine 6 flows into the second pipe, so that the reduced gas is heated by the third heat exchanger 7 to heat the water into steam. The outlet of the first pipe is connected to the inlet of the first steam turbine 9, so that the steam in the first pipe flows into the first steam turbine 9 to drive the first steam turbine 9 to rotate. Thus, by introducing the third heat exchanger 7 and the first steam turbine 9, the system realizes the heat energy recovery and reuse of the reduced gas flowing out of the first gas turbine 6, and improves the energy conversion efficiency of the entire system.

[0037] In some embodiments, the circulating power generation system 100 further includes a separator 8. The separator 8 is connected to the third heat exchanger 7, so that the reduced gas flowing out of the third heat exchanger 7 flows into the separator 8 to separate water and carbon dioxide in the reduced gas through the separator 8. Specifically, as Figure 1As shown, the inlet of the separator 8 is communicated with the outlet of the second pipeline of the third heat exchanger 7, so that the reduced gas after heat exchange and temperature reduction flows into the separator 8. The water and carbon dioxide in the reduced gas are separated by the separator 8, and the carbon dioxide is effectively recovered, reducing the emission of carbon dioxide, thereby reducing environmental pollution.

[0038] In some embodiments, the circulating power generation system 100 further includes a second gas turbine 11. The second gas turbine 11 is communicated with the oxidation reactor 10 so that the gas flowing out of the oxidation reactor 10 drives the second gas turbine 11 to rotate. Specifically, as Figure 1 shown, since there is still unreacted air (such as nitrogen, a small amount of oxygen, etc.) in the oxidation reactor 10, and since the oxidation reaction in the oxidation reactor 10 is an exothermic reaction, the unreacted air has a relatively high temperature. The inlet of the second gas turbine 11 is communicated with the outlet in the oxidation reactor 10, so that the unreacted air drives the second gas turbine 11 to rotate.

[0039] In some embodiments, the circulating power generation system 100 further includes a fourth heat exchanger 12 and a second steam turbine 13.

[0040] The fourth heat exchanger 12 is communicated with the second gas turbine 11 so that the gas flowing out of the second gas turbine 11 flows into the fourth heat exchanger 12. The fourth heat exchanger 12 is adapted to introduce water so that the gas in the fourth heat exchanger 12 heats the water into steam. The second steam turbine 13 is communicated with the fourth heat exchanger 12 so that the steam flowing out of the fourth heat exchanger 12 drives the second steam turbine 13 to rotate. Specifically, as Figure 1 shown, the fourth heat exchanger 12 has a first passage and a second passage for heat exchange. The inlet of the first passage is communicated with the outlet of the second gas turbine 11, so that the gas after the second gas turbine 11 does work flows into the first passage. The second passage is adapted to introduce water, so that the gas after the second gas turbine 11 does work heats the water into steam. The outlet of the second passage is communicated with the inlet of the second steam turbine 13, so that the steam drives the second steam turbine 13 to rotate. The system can make full use of the waste heat of the high-temperature gas after the second gas turbine 11 does work, convert the waste heat into the internal energy of steam, and then drive the second steam turbine 13 to rotate, realizing the efficient utilization of heat energy.

[0041] In some embodiments, the first heat exchanger 2 is adapted to be communicated with the high-pressure cylinder 15 and the intermediate-pressure cylinder 14 of the steam turbine, so that the high-pressure steam flowing out of the high-pressure cylinder 15 and the intermediate-pressure steam flowing out of the intermediate-pressure cylinder 14 flow into the first heat exchanger 2, and the temperature of the steam introduced into the first heat exchanger 2 is 350 °C. Specifically, as Figure 1As shown, the inlet of the first channel is connected to the outlets of the high-pressure cylinder 15 and the intermediate-pressure cylinder 14 of the steam turbine, so that the high-pressure steam generated by the high-pressure cylinder 15 of the steam turbine and the intermediate-pressure steam of the intermediate-pressure cylinder 14 are mixed and then flow into the first channel, thereby heating the air and the oxygen carrier in the first heat exchanger 2. Moreover, the ratio of the high-pressure steam and the intermediate-pressure steam is adjusted through a regulating valve to adjust the steam temperature flowing into the first heat exchanger 2 to about 350 °C, so that the air and the oxygen carrier are heated to about 350 °C, thereby supporting the 350 °C temperature environment required for the reduction reaction of the oxygen carrier and methane.

[0042] In some embodiments, the circulating power generation system 100 further includes a generator (not shown in the figure), and the generator is connected to the first gas turbine so that the first gas turbine drives the generator to generate electricity. Specifically, the first gas turbine, the second gas turbine, the third steam turbine, and the fourth steam turbine are all connected to the generator, thereby driving the generator to rotate to improve the power generation efficiency of the generator.

[0043] The present invention uses LaCu 0.1 Ni 0.9 O 3 as the oxygen carrier, which can undergo a reduction reaction with methane at 350 °C to generate LaCu 0.1 Ni 0.9 0 2.34 and reducing gas. Based on the principle of "temperature matching and cascaded utilization", based on a 300MW-class F-class combined cycle unit, the principle of mainly using the high-pressure extraction steam of the steam turbine (under the ISO environment, the average temperature of the steam above 50% load is about 340 °C) and supplemented by the intermediate-pressure reheated steam (under the ISO environment, the average temperature of the steam above 50% load is about 550 °C) is adopted. Each gas flow path pipeline is equipped with a flow regulating valve and a pressure regulating valve to mix the steam in an approximate pressure environment to support the 350 °C temperature environment required for the reduction reaction of the oxygen carrier and methane. The steam after the reaction enters the waste heat boiler in the corresponding temperature section for heat exchange. The oxygen carrier LaCu 0.1 Ni 0.9 0 2.34 after the reduction reaction enters the oxidation reactor 10, and the high-temperature flue gas (about 1200 °C) generated by the oxidation reaction enters the gas turbine turbine to do work.

[0044] 1) Gas pretreatment:

[0045] Since the oxygen carrier LaCu 0.1 Ni 0.9 0 3 needs a certain temperature and pressure to undergo the oxidation-reduction reaction, air and methane are respectively pressurized to a certain pressure (about 1.5 Mpa) by compressors for gas pretreatment operations.

[0046] 2) Reduction reactor 4 (FR):

[0047] The mixed gas of the high-pressure exhaust steam of the steam turbine and the intermediate-pressure reheated steam provides a heat source of 350 °C for the endothermic reaction of the reduction reactor 4. Methane reacts with the oxygen carrier LaCu 0.1 Ni 0.9 0 3 to undergo a reduction reaction, generating LaCu 0.1 Ni 0.9 0 2.34 and reduction gas (carbon dioxide and water). This part of the flue gas passes through the second heat exchanger 5 to absorb the sensible heat carried by LaCu 0.1 Ni 0.9 0 3 so that the flue gas temperature can be raised to 1100 °C. This part of the high-temperature flue gas can enter the gas turbine turbine to do work.

[0048] 3) Oxidation reactor 10 (AR):

[0049] The reduced oxide LaCu 0.1 Ni 0.9 0 2.34 enters the oxidation reactor 10 and undergoes an oxidation reaction with the air heated by the heat exchanger to regenerate LaCu 0.1 Ni 0.9 0 3 . This reaction is a strong exothermic reaction. Part of the released heat is used to increase the sensible heat of LaCu 0.1 Ni 0.9 0 3 , and part of it heats the gas (nitrogen + a very small amount of oxygen) to 1200 °C. This part of the high-temperature flue gas can enter the gas turbine turbine to do work.

[0050] In summary, the circulating power generation system 100 of the embodiment of the present invention divides the reaction into two stages of reduction reaction and oxidation reaction through the reduction reactor 4 and the oxidation reactor 10. Methane and oxygen do not directly contact, but the release and absorption of oxygen are realized through a certain amount of oxygen carrier. This process can realize an efficient fuel redox cycle process and a carbon dioxide self-separation process. Among them, as one of the oxygen carriers, it can react with methane at 350 °C to generate LaCu 0.1 Ni 0.9 0 2.34 . Thus, the advantage of the low-grade waste heat temperature section of the bottom cycle of the gas-steam combined cycle unit can be fully utilized to support the oxygen carrier LaCu 0.1 Ni 0.9 0 3It undergoes a reduction reaction with methane at an environment temperature of 350°C. The reaction requires a low temperature, and the oxidation reaction that occurs in the oxidation reactor 10 is a strongly exothermic process, which can generate high-temperature flue gas at 1200°C to provide high-temperature steam for the gas turbine turbine to do work. Thus, by combining the redox reaction of the oxygen carrier using low-grade heat energy (350°C) at the current stage with the gas-steam combined cycle system, the low-grade heat energy of the steam on the bottom cycle steam turbine side is fully utilized to improve the energy grade.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention.

[0052] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the present invention, unless otherwise clearly defined or limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Further, a first feature being "above", "over" and "on top of" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. A first feature being "under", "below" and "beneath" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0055] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0056] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A cycle power generation system, characterized in that: include: a first heat exchanger, wherein the first heat exchanger is adapted to pass steam, oxygen carrier and air so that the steam heats the oxygen carrier and the air through the first heat exchanger; a reduction reactor, the reduction reactor being in communication with the first heat exchanger so that the heated oxygen carrier flows into the reduction reactor, the reduction reactor being suitable for introducing methane so that the methane and the oxygen carrier undergo a reduction reaction to generate reduced oxygen carriers and reducing gas; an oxidation reactor storing a reduced oxygen carrier, the oxidation reactor being in communication with the first heat exchanger so that the heated air and the reduced oxygen carrier undergo an oxidation reaction in the oxidation reactor to generate the oxygen carrier; a second heat exchanger, the second heat exchanger being in communication with the reduction reactor and the oxidation reactor, so that the reduced oxygen carrier flowing out of the oxidation reactor heats the reducing gas flowing out of the reduction reactor through the second heat exchanger; A first gas turbine is connected to the second heat exchanger so that the reducing gas flowing out of the second heat exchanger flows into the first gas turbine to drive the first gas turbine to rotate.

2. The cycle power generation system according to claim 1, characterized in that: The second heat exchanger is communicated with the first heat exchanger so that the oxygen carrier in the second heat exchanger flows into the first heat exchanger, so that the steam in the first heat exchanger heats the oxygen carrier.

3. The cycle power generation system according to claim 1, characterized in that: The reduction reactor is communicated with the oxidation reactor so that the reduced oxygen carrier flowing out of the reduction reactor flows into the oxidation reactor.

4. The cycle power generation system according to claim 1, characterized in that: Also includes: a first compressor, the first compressor being in communication with the first heat exchanger, and the first compressor being adapted to allow air to pass therein, so that the first compressor compresses the air and the air flows into the first heat exchanger; A second compressor is connected to the reduction reactor and is suitable for introducing methane so that the second compressor compresses the methane and the methane flows into the reduction reactor.

5. The cycle power generation system according to claim 1, characterized in that: Also includes: a third heat exchanger, the third heat exchanger being in communication with the first gas turbine so that the reducing gas flowing out of the first gas turbine flows into the third heat exchanger, the third heat exchanger being suitable for passing water so that the reducing gas in the third heat exchanger heats the water into steam; The first steam turbine is connected to the third heat exchanger so that the steam flowing out of the third heat exchanger drives the first steam turbine to rotate.

6. The cycle power generation system according to claim 5, characterized in that: The system further comprises a separator which is in communication with the third heat exchanger so that the reducing gas flowing out of the third heat exchanger flows into the separator to separate water and carbon dioxide in the reducing gas through the separator.

7. The cycle power generation system according to claim 1, characterized in that: It also includes a second gas turbine, which is connected to the oxidation reactor so that the gas flowing out of the oxidation reactor drives the second gas turbine to rotate.

8. The cycle power generation system according to claim 7, characterized in that: Also includes: a fourth heat exchanger, the fourth heat exchanger being in communication with the second gas turbine so that the gas flowing out of the second gas turbine flows into the fourth heat exchanger, the fourth heat exchanger being adapted to allow water to flow into the fourth heat exchanger so that the gas in the fourth heat exchanger heats the water into steam; A second steam turbine is connected to the fourth heat exchanger so that the steam flowing out of the fourth heat exchanger drives the second steam turbine to rotate.

9. The cycle power generation system according to claim 1, characterized in that: The first heat exchanger is suitable for being connected to the high-pressure cylinder and the intermediate-pressure cylinder of the steam turbine so that the high-pressure steam flowing out of the high-pressure cylinder and the intermediate-pressure steam flowing out of the intermediate-pressure cylinder flow into the first heat exchanger, and the steam temperature introduced into the first heat exchanger is 350°C.

10. The cycle power generation system according to claim 1, characterized in that: It also includes a generator, which is connected to the first gas turbine so that the first gas turbine drives the generator to generate electricity.

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