A combined cycle coupled compressed air and syngas supplementary combustion peak shaving system and method

Abstract

The present invention discloses a combined cycle coupled with compressed air and syngas supplementary combustion peak shaving system and method. Among them, the combined cycle coupled with compressed air and syngas supplementary combustion peak shaving system includes: a gas turbine power generation system adapted to convert chemical energy into electrical energy, and the gas turbine power generation system is adapted to be electrically connected to the power grid; a waste heat recovery system includes a waste heat boiler, and the waste heat boiler is communicated with the flue gas outlet of the gas turbine power generation system; a supplementary combustion system includes a supplementary combustor, the supplementary combustor is arranged in the waste heat boiler, and the supplementary combustor is adapted to be communicated with a syngas source; an energy storage system includes a compressor unit, a first gas storage member and a first power generation set. The compressed air generated by the compressor unit is sequentially input into the first power generation set after passing through the first gas storage member and the waste heat boiler, and the first power generation set is adapted to be electrically connected to the power grid. By means of the supplementary combustor, the flue gas energy in the waste heat boiler is increased, so that the power generated by the first power generation set is increased, thereby broadening the peak shaving range of the compressed air.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation, and particularly relates to a combined cycle coupled with compressed air and syngas supplementary combustion peak shaving system and method. Background Art

[0002] With the large-scale grid-connected power generation of renewable energy and the real-time changes at the power consumption end, the peak shaving requirements for the power generation side of the power grid are getting higher and higher. Building large-scale energy storage devices is an effective means to suppress the volatility of renewable energy power generation and improve the operation reliability of the power system. The relatively mature energy storage technologies mainly include pumped storage, compressed air energy storage, electrochemical energy storage, etc. Pumped storage has high efficiency, but has strict geographical conditions; Electrochemical energy storage has problems such as short lifespan and industrial pollution; While compressed air energy storage technology has the characteristics of long lifespan, low environmental pollution, and low operation and maintenance costs.

[0003] There is a existing peak shaving system of compressed air and gas-steam cycle, which includes a gas turbine power generation unit, a compressed air energy storage unit, a waste heat boiler power generation unit and a heat exchange unit. The inlet of the gas turbine power generation unit is connected to compressed air and gas. The flue gas outlet of the gas turbine power generation unit is connected to the flue gas inlet of the waste heat boiler power generation unit and the heat exchange unit, and the heat exchange unit is connected to the waste heat boiler power generation unit; The compressed air energy storage unit includes a compressor set, a gas storage container and an expansion generator set connected in sequence. An endothermic unit is arranged between the exhaust port of the compressor set and the gas storage container. The gas outlet of the gas storage container is connected to the working medium inlet of the expansion generator set through the heat exchange unit; Coupling the gas turbine with the compressed gas endothermic expansion process with higher heat utilization rate to achieve the peak shaving function of compressed air.

[0004] However, for the above-mentioned peak shaving system of compressed air and gas-steam cycle, when the gas turbine operates at low load, the amount of flue gas generated is small, resulting in a decrease in the temperature and pressure of the compressed air input to the expansion generator set after passing through the waste heat boiler, thereby causing a low generated power and further reducing the peak shaving range of compressed air. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that when the gas turbine operates at low load, the concentration of the generated flue gas is small, resulting in a decrease in the temperature and pressure of the compressed air input to the expansion generator set after passing through the waste heat boiler, thereby causing a low generated power and further reducing the peak shaving range of compressed air.

[0006] For this reason, the present invention provides a combined cycle coupled with compressed air and syngas supplementary combustion peak shaving system, which is characterized by including:

[0007] A gas turbine power generation system, the gas turbine power generation system is adapted to convert chemical energy into electrical energy, and the gas turbine power generation system is adapted to be electrically connected to the power grid;

[0008] A waste heat recovery system, the waste heat recovery system includes a waste heat boiler, and the waste heat boiler is communicated with the flue gas outlet of the gas turbine power generation system;

[0009] A supplementary combustion system, the supplementary combustion system includes a supplementary combustor, the supplementary combustor is arranged in the waste heat boiler, and the supplementary combustor is adapted to be communicated with a synthesis gas source;

[0010] An energy storage system, the energy storage system includes a compressor unit, a first gas storage member and a first power generation unit, the compressor unit is adapted to be electrically connected to the power grid, the compressed air generated by the compressor unit is adapted to sequentially pass through the first gas storage member and the waste heat boiler and then be input into the first power generation unit, and the first power generation unit is adapted to be electrically connected to the power grid.

[0011] Optionally, for the above combined cycle coupled compressed air and synthesis gas supplementary combustion peak shaving system, the synthesis gas source is a gasifier, and the synthesis gas generated by the gasifier is adapted to sequentially pass through a filter member and a first switching member and then be input into the supplementary combustor.

[0012] Optionally, for the above combined cycle coupled compressed air and synthesis gas supplementary combustion peak shaving system, the energy storage system further includes a heat conduction tank, which is arranged between the compressor unit and the first gas storage member, the compressed air generated by the compressor unit is adapted to pass through the heat conduction tank and then be input into the first gas storage member, the synthesis gas in the filter member is input into the heat conduction tank to exchange heat with it, and then the synthesis gas in the heat conduction tank is input into the supplementary combustor via the first switching member.

[0013] Optionally, for the above combined cycle coupled compressed air and synthesis gas supplementary combustion peak shaving system, the energy storage system further includes a first heat exchanger, the first heat exchanger is arranged in the waste heat boiler, and the compressed air in the first gas storage member is adapted to pass through the first heat exchanger and then be input into the first power generation unit.

[0014] Optionally, for the above combined cycle coupled compressed air and synthesis gas supplementary combustion peak shaving system, the energy storage system further includes a second heat exchanger, the second heat exchanger is arranged in the waste heat boiler, the second heat exchanger is arranged between the first heat exchanger and the first power generation unit, the compressed air passing through the first heat exchanger is introduced into the second heat exchanger for heat exchange, and then is input into the first power generation unit by the second heat exchanger, and the second heat exchanger is connected to the supplementary combustor through a first pipeline.

[0015] Optionally, for the above combined cycle coupled compressed air and synthesis gas supplementary combustion peak shaving system, the first power generation unit includes:

[0016] A first turbine, the compressed air heat-exchanged by the second heat exchanger is input into the first turbine;

[0017] A first generator, the first generator being connected to the first turbine via a first drive shaft.

[0018] Optionally, in the above combined cycle coupled compressed air and syngas supplementary combustion peak shaving system, the energy storage system further includes a second gas storage member, the compressed air heat-exchanged via the second heat exchanger is input into the second gas storage member, and the compressed air in the second gas storage member can be input into the first turbine.

[0019] Optionally, in the above combined cycle coupled compressed air and syngas supplementary combustion peak shaving system, the waste heat recovery system further includes:

[0020] A condensate pump, the condensate pump being adapted to communicate with the condensate outlet of the gas turbine power generation system;

[0021] A third heat exchanger, the third heat exchanger being disposed in the waste heat boiler;

[0022] A second turbine, the second turbine being connected to a second generator via a second drive shaft;

[0023] The condensate water pumped by the condensate pump is adapted to flow through the first heat exchanger and the third heat exchanger in sequence and then be input into the second turbine.

[0024] Optionally, in the above combined cycle coupled compressed air and syngas supplementary combustion peak shaving system, the waste heat recovery system further includes:

[0025] A third turbine, the third turbine being disposed on the second drive shaft;

[0026] A fourth heat exchanger, the water vapor heat-exchanged via the first heat exchanger flows through the fourth heat exchanger and then is input into the third turbine.

[0027] Optionally, in the above combined cycle coupled compressed air and syngas supplementary combustion peak shaving system, the waste heat recovery system further includes a partition member, the partition member divides the waste heat boiler into a first accommodation chamber and a second accommodation chamber, and a damper is provided on the partition member, the second accommodation chamber communicates with the first accommodation chamber through the damper, the first accommodation chamber communicates with the gas turbine power generation flue gas outlet, and the first heat exchanger, the third heat exchanger and the fourth heat exchanger are all disposed in the first accommodation chamber, and the second heat exchanger is disposed in the second accommodation chamber.

[0028] The present invention also provides a combined cycle coupled compressed air and syngas supplementary combustion peak shaving method, which is suitable for adopting the above combined cycle coupled compressed air and syngas supplementary combustion peak shaving system, and includes the following steps:

[0029] S1: When the gas turbine power generation system starts, start the compressor unit to compress air, input the compressed air into the heat conduction tank for heat exchange, and then store the compressed air with reduced temperature into the first air storage component;

[0030] S2: Deliver the flue gas generated by the gas turbine power generation system to the waste heat boiler. Open the air damper on the partition member, and the flue gas diffuses into the first accommodation cavity and the second accommodation cavity respectively. The compressed air in the first air storage component is sequentially input into the first heat exchanger and the second heat exchanger for heat exchange. Open the condensate pump, and the condensate water is delivered to the first heat exchanger, the third heat exchanger, and the fourth heat exchanger respectively for heat exchange;

[0031] S3: Start the gasifier to work. The generated synthesis gas is input into the heat conduction tank through the filter element, so that the temperature of the synthesis gas rises. Deliver the heated synthesis gas to the afterburner, and the afterburner further increases the temperature in the waste heat boiler;

[0032] S4: Input the compressed air in the second heat exchanger into the first turbine and drive the first turbine to rotate. The first turbine drives the first generator to generate electricity through the first drive shaft; Deliver the heated steam in the third heat exchanger to the second turbine, and at the same time deliver the high-temperature steam in the fourth heat exchanger to the third turbine. The second turbine and the third turbine drive the second drive shaft to rotate at the same time, and the second drive shaft drives the second generator to generate electricity;

[0033] S5: When the gas turbine power generation system stops, the gasifier stops working, and the high-temperature compressed air in the second heat exchanger is delivered to the second air storage component.

[0034] Optionally, for the above combined cycle coupling compressed air and synthesis gas afterburning peak shaving method, after the above step S4 and before step S5, it further includes:

[0035] S41: When it is necessary to quickly make the total power generation equal to the grid load, deliver the high-temperature compressed air in the second air storage component to the first turbine and drive the first turbine to rotate. The first turbine drives the first generator to generate electricity through the first drive shaft.

[0036] Optionally, for the above combined cycle coupling compressed air and synthesis gas afterburning peak shaving method, after the above step S42 and before step S5, it further includes:

[0037] S42: When the total power generation is greater than the grid load, start the compressor unit. The compressed air generated by the compressor unit is input into the first air storage tank after heat exchange through the heat conduction tank.

[0038] The technical solution provided by the present invention has the following advantages:

[0039] 1. The combined cycle coupled compressed air and syngas combustion supplementary peak shaving system provided by the present invention includes a gas turbine power generation system, a waste heat recovery system, a combustion supplementary system, and an energy storage system. The gas turbine power generation system is adapted to convert chemical energy into electrical energy, and the gas turbine power generation system is adapted to be electrically connected to the power grid; the waste heat recovery system includes a waste heat boiler, and the waste heat boiler is communicated with the flue gas outlet of the gas turbine power generation system; the combustion supplementary system includes a combustor, the combustor is arranged in the waste heat boiler, and the combustor is adapted to be communicated with the syngas source; the energy storage system includes a compressor unit, a first gas storage member, and a first power generation unit. The compressor unit is adapted to be electrically connected to the power grid. The compressed air generated by the compressor unit sequentially passes through the first gas storage member and the waste heat boiler and then is input into the first power generation unit, and the first power generation unit is adapted to be electrically connected to the power grid.

[0040] For the combined cycle coupled compressed air and syngas combustion supplementary peak shaving system with this structure, when the gas turbine power generation system operates at low load, the amount of flue gas generated is small. The energy of the flue gas in the waste heat boiler can be increased through the combustor, so that the temperature and pressure of the compressed air input into the first power generation unit after passing through the waste heat boiler are increased, so that the power generated by the first power generation unit is increased, and further the peak shaving range of the compressed air is broadened.

[0041] 2. For the combined cycle coupled compressed air and syngas combustion supplementary peak shaving system provided by the present invention, a partition plate divides the waste heat boiler into a first accommodation chamber and a second accommodation chamber, and a damper is arranged on the partition member. The second accommodation chamber is communicated with the first accommodation chamber through the damper. The first accommodation chamber is communicated with the flue gas outlet of the gas turbine power generation. And a first heat exchanger, a third heat exchanger, and a fourth heat exchanger are all arranged in the first accommodation chamber, and a second heat exchanger is arranged in the second accommodation chamber. A plurality of heat exchangers are arranged in the waste heat boiler, so that the temperature drop of the flue gas in the waste heat boiler is increased, the efficiency of the waste heat boiler is improved, the heat of the flue gas is fully utilized, the peak shaving capacity of the combined cycle coupled compressed air and syngas combustion supplementary peak shaving system is further improved, and the energy utilization rate is increased by heating water vapor and compressed air with the flue gas at the same time.

[0042] 3. For the combined cycle coupled compressed air and syngas combustion supplementary peak shaving system provided by the present invention, the compressed air generated by the compressor unit is input into the first gas storage member after heat exchange through a heat conduction tank, so that the heat of the compressed air is transferred to the heat conduction tank. The syngas flowing through the first switching member is input into the heat conduction tank for heat exchange and then input into the combustor. The temperature of the syngas is increased through the heat conduction tank, so that the syngas is close to the ignition point, so that the syngas burns sufficiently, the combustion efficiency of the syngas is improved, and the generation of pollutants due to insufficient combustion is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0044] Figure 1 Schematic diagram of the combined cycle coupled with compressed air and syngas supplementary combustion peak shaving system provided by the present invention;

[0045] Figure 2 Schematic diagram of another perspective of the combined cycle coupled with compressed air and syngas supplementary combustion peak shaving system provided by the present invention.

[0046] Description of the reference numerals in the drawings:

[0047] 1. Gas turbine power generation system;

[0048] 21. Waste heat boiler; 211. First accommodation chamber; 212. Second accommodation chamber; 213. Air door; 22. Condensate pump; 23. Third heat exchanger; 24. Second power generation unit; 241. Second turbine; 242. Second drive shaft; 243. Second generator; 244. Third turbine; 25. Fourth heat exchanger; 26. Partition member;

[0049] 31. Supplementary combustor; 32. Gasifier; 33. Filter member; 34. First switch member; 35. Second switch member;

[0050] 41. Compressor unit; 42. First gas storage member; 43. First power generation unit; 431. First turbine; 432. First generator; 433. First drive shaft; 44. Heat conduction tank; 45. First heat exchanger; 46. Second heat exchanger; 47. Second gas storage member. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] The following will clearly and completely describe the technical solutions of the present invention with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0052] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. These are 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. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0053] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. 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 addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0055] Embodiment 1

[0056] This embodiment provides a circulating coupled compressed air and syngas supplementary combustion peak shaving system, as Figure 1 and Figure 2 shown, which includes a gas turbine power generation system 1, a waste heat recovery system, a supplementary combustion system, and an energy storage system. The gas turbine power generation system 1 is adapted to convert chemical energy into electrical energy, and the gas turbine power generation system 1 is adapted to be electrically connected to the power grid; the waste heat recovery system includes a waste heat boiler 21, and the waste heat boiler 21 is in communication with the flue gas outlet of the gas turbine power generation system 1; the supplementary combustion system includes a supplementary combustor 31, the supplementary combustor 31 is disposed in the waste heat boiler 21, and the supplementary combustor 31 is adapted to be in communication with the synthesis origin; the energy storage system includes a compressor unit 41, a first gas storage member 42, and a first generator set 43. The compressor unit 41 is adapted to be electrically connected to the power grid. The compressed air generated by the compressor unit 41 sequentially passes through the first gas storage member 42 and the waste heat boiler 21 and then is input into the first generator set 43, and the first generator set 43 is adapted to be electrically connected to the power grid.

[0057] In the combined cycle coupled compressed air and syngas supplementary combustion peak shaving system provided in this embodiment, when the gas turbine power generation system 1 operates at low load, the amount of flue gas generated is small. The energy of the flue gas in the waste heat boiler 21 can be increased through the supplementary combustor 31, so that the temperature and pressure of the compressed air input into the first generator set 43 of the waste heat boiler 21 are increased, thereby increasing the power generated by the first generator set 43, and further broadening the peak shaving range of the compressed air.

[0058] As Figure 1 shown, in the combined cycle coupled compressed air and syngas supplementary combustion peak shaving system provided in this embodiment, the gas turbine power generation system 1 includes a steam turbine, a boiler, and a generator set. Gas and oxygen are input into the boiler to burn the two and heat the water in the boiler to generate high-temperature and high-pressure steam. Then, the high-temperature and high-pressure steam is input into the steam turbine. The high-temperature and high-pressure steam does work on the steam turbine to drive the steam turbine to rotate. The steam turbine drives the generator set to generate electricity. The generator set is connected to the power grid through wires. The flue gas generated by the boiler is sent into the waste heat boiler 21 through a flue gas pipeline. After the high-temperature and high-pressure steam does work on the steam turbine, it condenses into condensate water.

[0059] As Figure 1 and Figure 2As shown in the figure, the combined cycle coupled with compressed air and syngas supplementary combustion peak shaving system provided by this embodiment. The supplementary combustion system further includes a first switching member 34 and a filtering member 33. The syngas source is a gasifier 32, which can send industrial waste, domestic waste, and polluting biomass energy into the gasifier 32 for combustion treatment and generate syngas. Compared with the landfill method, it reduces environmental pollution and fully utilizes the energy contained in the waste. The filtering member 33 is a water pipe filter, which is used to filter out impurities such as ash in the syngas. The syngas generated by the gasifier 32 is input into a heat conduction tank 44 for heat exchange after passing through the filtering member 33, so that the temperature of the syngas rises. The heated syngas in the heat conduction tank 44 is communicated with a supplementary combustor 31 through a pipeline. The supplementary combustor 31 is located in a waste heat boiler 21. One end of the pipeline far from the heat conduction tank 44 extends into the waste heat boiler 21 and is communicated with the supplementary combustor 31. This pipeline is close to the flue gas inlet of the waste heat boiler 21. The pipeline extends from the top inner wall of the waste heat boiler 21 to the bottom inner wall of the waste heat boiler, and then extends upward to connect with the bottom of the supplementary combustor 31, increasing the length of the pipeline in the waste heat boiler 21, thereby increasing the flowing time of the syngas in the waste heat boiler 21, and further preheating the syngas by using the flue gas heat of the waste heat boiler 21. And a first switching member 34 is provided on this pipeline to control the flow rate of the medium in the pipeline. By raising the temperature of the syngas through the heat conduction tank 44, the syngas is made close to the ignition point, so that the syngas burns fully, improving the combustion efficiency of the syngas and avoiding the generation of pollutants due to incomplete combustion of the syngas. The supplementary combustor 31 includes a tubular main body, an igniter, and nozzles. Multiple nozzles are distributed on the wall surface of the tubular main body. The multiple nozzles make the syngas expand and spray into the waste heat boiler 21 in a divergent shape, and react with the oxygen in the flue gas in the waste heat boiler 21 under the ignition of the igniter, further increasing the temperature of the flue gas, and thus further increasing the temperature in the waste heat boiler 21.

[0060] As Figure 1 shown in the figure, the combined cycle coupled with compressed air and syngas supplementary combustion peak shaving system provided by this embodiment. The energy storage system further includes a heat conduction tank 44. The compressor unit 41 includes multiple air compressors. The compressor unit 41 is connected to the power grid through wires. When the grid load is less than the total power generation, the compressor unit 41 starts, extracts air and performs multi-stage compression, and sends the compressed air into the heat conduction tank 44. Heat-conducting oil is contained in the heat conduction tank 44. Since heat is generated after air compression, the compressed air input into the heat conduction tank 44 is exchanged with the heat-conducting oil, and the temperature of the heat-conducting oil rises. The tank body of the heat conduction tank 44 is made of heat-insulating material. The cooled compressed air is sent into a first gas storage member 42 for storage. The first gas storage member 42 is a tank body. After the compressed air passes through the heat conduction tank 44 and is cooled, the first gas storage member 42 can store more compressed air. The compressed air input into the heat conduction tank 44 by the compressor unit 41 raises the temperature of the heat-conducting oil. The syngas exchanges heat with the heat-conducting oil in the heat conduction tank 44, reducing the temperature of the heat-conducting oil, forming a heat exchange cycle, and fully utilizing the heat generated by the compressed air.

[0061] As shown in Figure 1 Figure, the combined cycle coupled compressed air and syngas supplementary combustion peak shaving system provided in this embodiment, the energy storage system further includes a first heat exchanger 45, a second heat exchanger 46 and a second gas storage member 47. The first heat exchanger 45 and the second heat exchanger 46 are both arranged in the waste heat boiler 21. The first heat exchanger 45 is a low-temperature heat exchanger, and the second heat exchanger 46 is a high-temperature air heat exchanger. The first heat exchanger 45 is arranged on the left side of the waste heat boiler 21, that is, the first heat exchanger 45 is far from the flue gas inlet of the waste heat boiler 21. The second heat exchanger 46 is arranged between the first heat exchanger 45 and the supplementary combustor 31. The first heat exchanger 45 includes an air heat exchanger part and a steam heat exchanger part. The compressed air in the first gas storage member 42 flows through the first heat exchanger 45 and the second heat exchanger 46. The second heat exchanger 46 is communicated with the outside of the waste heat boiler 21 through a pipeline. The end of the pipeline extending outside the waste heat boiler 21 is connected with a three-way valve. The first outlet of the three-way valve is communicated with the first generator set 43. The second outlet of the three-way valve is communicated with the second gas storage member 47. The third outlet of the three-way valve is communicated with the supplementary combustor 31 through a first pipeline, and a second switching member 35 is arranged on the first pipeline to control the flow rate of the high-temperature compressed air in the first pipeline. The second gas storage member 47 is also a tank body, and the tank body is made of heat-insulating material. The high-temperature compressed air of the second gas storage member 47 is used to be input into the first generator set 43.

[0062] As shown in Figure 1 Figure, the combined cycle coupled compressed air and syngas supplementary combustion peak shaving system provided in this embodiment, the first generator set 43 includes a first turbine 431 and a first generator 432. The first turbine 431 is an air turbine. The first generator 432 is connected to the first turbine 431 through a first drive shaft 433. The gas turbine power generation system 1 and the first generator 432 share the first drive shaft 433. As an alternative implementation, the gas turbine power generation system 1 drives the generator set of the gas turbine to generate electricity with another drive shaft. The high-temperature compressed air in the second heat exchanger 46 is input into the first turbine 431 through a pipeline, impacts the first turbine 431 and makes it rotate. The first turbine 431 drives the first generator 432 to generate electricity. The first generator 432 is connected to the power grid through a wire. The compressed air passing through the first turbine 431 is sent into the gas turbine power generation system 1 to participate in combustion.

[0063] As shown in Figure 1As shown in the figure, for the combined cycle coupled compressed air and syngas supplementary combustion peak shaving system provided in this embodiment, the waste heat recovery system further includes a condensate pump 22, a third heat exchanger 23, a second turbine 241, a third turbine 244, and a fourth heat exchanger 25. Both the third heat exchanger 23 and the fourth heat exchanger 25 are located inside the waste heat boiler 21. The third heat exchanger 23 is a medium-temperature steam heat exchanger, and the fourth heat exchanger 25 is a high-temperature steam heat exchanger. The fourth heat exchanger 25 is close to the supplementary combustor 31. The third heat exchanger 23 is arranged between the first heat exchanger 45 and the fourth heat exchanger 25. The second turbine 241 is connected to the second generator 243 through the second drive shaft 242. The third turbine 244 is arranged on the second drive shaft 242. The steam heat exchange part of the first heat exchanger 45 is connected to the steam turbine of the gas turbine power generation system 1 through a pipeline. The condensate pump 22 is arranged on this pipeline and is used to extract and transport the condensate generated by the steam turbine into the steam heat exchange part of the first heat exchanger 45. The first heat exchanger 45 has two branches. After the condensate exchanges heat through the first heat exchanger 45, it becomes water vapor and then is input into the third heat exchanger 23. The third heat exchanger 23 raises the temperature of the water vapor, and then the heated water vapor is sent into the second turbine 241 outside the waste heat boiler 21. The heated water vapor does work on the second turbine 241 and causes the second turbine 241 to rotate. The second turbine 241 drives the second generator 243 to rotate through the second drive shaft 242, thereby generating electric energy. The condensate also enters the fourth heat exchanger 25 after passing through the first heat exchanger 45. The fourth heat exchanger 25 heats the water vapor. Since the fourth heat exchanger 25 is closer to the flue gas inlet and the supplementary combustor 31, the fourth heat exchanger 25 can raise the temperature of the water vapor to a higher level. The high-temperature water vapor in the fourth heat exchanger is input into the third turbine 244, causing the third turbine 244 to rotate. The third turbine 244 drives the second generator 243 to rotate through the second drive shaft 242, thereby generating electric energy.

[0064] As Figure 1As shown in the figure, for the combined cycle coupled compressed air and syngas supplementary combustion peak shaving system provided in this embodiment, the waste heat recovery system further includes a partition member 26. The partition member 26 divides the waste heat boiler 21 into a first accommodation chamber 211 and a second accommodation chamber 212, and a damper 213 is provided on the partition member 26. The second accommodation chamber 212 communicates with the first accommodation chamber 211 through the damper 213. The first accommodation chamber 211 communicates with the gas turbine power generation flue gas outlet, and the first heat exchanger 45, the third heat exchanger 23, and the fourth heat exchanger 25 are all arranged in the first accommodation chamber 211, and the second heat exchanger 46 is arranged in the second accommodation chamber 212. The second accommodation chamber 212 can be closed by the damper 213, so that the flue gas is discharged from the flue gas outlet of the waste heat boiler 21 after passing through the first accommodation chamber 211. When the compressed air in the first gas storage member 42 is used up, the damper 213 is closed, so that the waste heat of the flue gas only supplies the first heat exchanger 45, the third heat exchanger 23, and the fourth heat exchanger 25.

[0065] For the combined cycle coupled compressed air and syngas supplementary combustion peak shaving system provided in this embodiment, its working process is as follows:

[0066] When the total power generation is greater than the load of the power grid, the compressor unit 41 operates, and the high-temperature compressed air generated by the compressor unit 41 is input into the heat conduction tank 44. The high-temperature compressed air transfers heat to the heat conduction oil in the heat conduction tank 44, and the cooled compressed air is input into the first gas storage member 42 for storage.

[0067] When the total power generation is less than the load of the power grid, biomass waste is fed into the gasifier 32 to generate syngas. The generated syngas is filtered by the filter element 33 and then fed into the heat conduction tank 44. The syngas absorbs the heat in the heat conduction oil and then increases in temperature. The heated syngas is transported through a pipeline to the afterburner 31, and the amount of the heated syngas input into the afterburner 31 is controlled by the first switching element 34. Meanwhile, the flue gas generated by the gas turbine power generation system 1 is input into the waste heat boiler 21, and the air damper 213 on the partition member 26 is opened. The compressed air in the first air storage member 42 is heated after passing through the first heat exchanger 45, and the heated compressed air is input into the second heat exchanger 46 to further increase the temperature and become high-temperature compressed air. The high-temperature compressed air is transported through a pipeline to the three-way valve and is transported from the first outlet of the three-way valve to the first turbine 431. The high-temperature compressed air impacts the first turbine 431 and makes it rotate. The first turbine 431 drives the first generator 432 to rotate and generate electricity through the first drive shaft 433. The high-temperature compressed air is transported from the third outlet of the three-way valve into the afterburner 31 through the first pipeline. A second switching element 35 is provided on the first pipeline, and the second switching element 35 is used to control the amount of the high-temperature compressed air input into the afterburner 31. The input high-temperature compressed air is mixed with the high-temperature syngas and burns fully to increase the temperature in the waste heat boiler 21. At this time, the condensate pump 22 transports the condensate generated by the gas turbine power generation system 1 through a pipeline into the first heat exchanger 45. The condensate exchanges heat with the first heat exchanger 45 and then increases in temperature to form water vapor. The water vapor is transported to the third heat exchanger 23 to increase the temperature, and the heated water vapor is transported to the second turbine 241. The heated water vapor impacts the second turbine 241 and makes it rotate. The second turbine 241 drives the second generator 243 to rotate and generate electricity. Meanwhile, the water vapor in the first heat exchanger 45 is transported to the fourth heat exchanger 25 to increase the temperature to form high-temperature water vapor. The high-temperature water vapor is transported to the third turbine 244. The high-temperature water vapor impacts the third turbine 244 and makes it rotate. The third turbine 244 drives the second generator 243 to rotate and generate electricity through the second drive shaft 242.

[0068] Embodiment 2

[0069] This embodiment provides a combined cycle coupling compressed air and syngas afterburning peak shaving method, including the combined cycle coupling compressed air and syngas afterburning peak shaving system in Embodiment 1, and further including:

[0070] S1: When the gas turbine power generation system 1 is started, the compressor unit 41 is started to compress air, and the compressed air is input into the heat conduction tank 44 for heat exchange, and then the compressed air with reduced temperature is stored in the first air storage member 42;

[0071] S2: Deliver the flue gas generated by the gas turbine power generation system 1 to the waste heat boiler 21. Open the air damper 213 on the partition member 26, and input the flue gas into the first accommodation chamber 211 and the second accommodation chamber 212 respectively. Input the compressed air of the first gas storage member 42 into the first heat exchanger 45 and the second heat exchanger 46 for heating. Open the condensate pump 22, and deliver the condensate water to the first heat exchanger 45, the third heat exchanger 23, and the fourth heat exchanger 25 respectively for heating;

[0072] S3: The gasifier 32 starts to work. The generated synthesis gas is input into the heat conduction tank 44 through the filter member 33, so that the temperature of the synthesis gas rises. Deliver the synthesis gas with increased temperature to the afterburner 31, and the heat increasing member further increases the temperature and heat of the flue gas in the waste heat boiler 21; The synthesis gas is mixed with the flue gas and further burned, thereby increasing the heat in the waste heat boiler 21;

[0073] S4: Input the compressed air in the second heat exchanger 46 into the first turbine 431 and drive the first turbine 431 to rotate. The first turbine 431 drives the generator to generate electricity through the first drive shaft 433; Deliver the steam in the third heat exchanger 23 to the second turbine 241, and at the same time deliver the steam in the fourth heat exchanger 25 to the third turbine 244. The second turbine 241 and the third turbine 244 drive the second drive shaft 242 to rotate at the same time, and the second drive shaft 242 drives the second generator 243 to generate electricity;

[0074] S41: When it is necessary to quickly balance the total power generation with the grid load, deliver the high-temperature compressed air in the second gas storage member 47 to the first turbine and drive the first turbine to rotate. The first turbine drives the generator to generate electricity through the first drive shaft 433.

[0075] S42: When the total power generation is greater than the grid load, the compressor unit 41 starts. The compressed air generated by the compressor unit 41 is input into the first gas storage tank for storage after heat exchange through the heat conduction tank 44.

[0076] S5: When the gas turbine power generation system 1 stops, the gasifier 32 stops working, and deliver the high-temperature compressed air in the second heat exchanger to the second gas storage member 47.

[0077] The combined cycle coupling compressed air and synthesis gas afterburning peak shaving method provided by this embodiment enables the flue gas to burn fully, reduces the emission of harmful gases, and thus reduces environmental pollution.

[0078] Obviously, the above embodiments are merely examples given for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A combined cycle coupled compressed air and syngas supplementary combustion peak shaving system, characterized in that Comprising: A gas turbine power generation system (1), the gas turbine power generation system (1) being adapted to convert chemical energy into electrical energy, and the gas turbine power generation system (1) being adapted to be electrically connected to the power grid; A waste heat recovery system, the waste heat recovery system comprising a waste heat boiler (21), the waste heat boiler (21) being in communication with the flue gas outlet of the gas turbine power generation system (1); A supplementary combustion system, the supplementary combustion system comprising a supplementary combustor (31), the supplementary combustor (31) being disposed within the waste heat boiler (21), and the supplementary combustor (31) being adapted to be in communication with a synthesis gas source; An energy storage system, the energy storage system comprising a compressor unit (41), a first gas storage member (42), and a first power generation unit (43), the compressor unit (41) being adapted to be electrically connected to the power grid, the compressed air generated by the compressor unit (41) being adapted to sequentially pass through the first gas storage member (42) and the waste heat boiler (21) and then be input into the first power generation unit (43), and the first power generation unit (43) being adapted to be electrically connected to the power grid; The energy storage system further comprises a first heat exchanger (45), the first heat exchanger (45) being disposed within the waste heat boiler (21), and the compressed air within the first gas storage member (42) being adapted to pass through the first heat exchanger (45) and then be input into the first power generation unit (43); The energy storage system further comprises a second heat exchanger (46), the second heat exchanger (46) being disposed within the waste heat boiler (21), the second heat exchanger (46) being disposed between the first heat exchanger (45) and the first power generation unit (43), the compressed air passing through the first heat exchanger (45) being introduced into the second heat exchanger (46) for heat exchange, and then being input into the first power generation unit (43) by the second heat exchanger (46), and the second heat exchanger (46) being connected to the supplementary combustor (31) through a first pipeline.

2. The combined cycle coupled compressed air and syngas supplementary combustion peak shaving system according to claim 1, wherein The synthesis gas source is a gasifier (32), and the synthesis gas generated by the gasifier (32) is adapted to sequentially pass through a filter member (33) and a first switching member (34) and then be input into the supplementary combustor (31).

3. The combined cycle coupled compressed air and syngas supplementary combustion peak shaving system according to claim 2, wherein, The energy storage system further comprises a heat conduction tank (44), which is disposed between the compressor unit (41) and the first gas storage member (42), the compressed air generated by the compressor unit (41) being adapted to pass through the heat conduction tank (44) and then be input into the first gas storage member (42), the synthesis gas within the filter member (33) being input into the heat conduction tank (44) for heat exchange therewith, and then the synthesis gas within the heat conduction tank (44) being input into the supplementary combustor (31) via the first switching member (34).

4. The combined cycle coupled compressed air and syngas supplementary combustion peak shaving system according to claim 1, wherein The first power generation unit (43) comprises: A first turbine (431), the compressed air heat-exchanged by the second heat exchanger (46) being input into the first turbine (431); A first generator (432), the first generator (432) being connected to the first turbine (431) through a first drive shaft (433).

5. The combined cycle coupled compressed air and syngas supplementary combustion peak shaving system according to claim 4, characterized in that, The energy storage system further includes a second gas storage member (47), and the compressed air heat-exchanged by the second heat exchanger (46) is input into the second gas storage member (47), and the compressed air in the second gas storage member (47) can be input into the first turbine (431).

6. The combined cycle coupled compressed air and syngas supplementary combustion peak shaving system according to any one of claims 1-5, wherein The waste heat recovery system further includes: a condensate pump (22), and the condensate pump (22) is adapted to communicate with the condensate water outlet of the gas turbine power generation system (1); a third heat exchanger (23), and the third heat exchanger (23) is disposed in the waste heat boiler (21); a second turbine (241), and the second turbine (241) is connected to a second generator (243) through a second drive shaft (242); The condensate water pumped by the condensate pump (22) is adapted to flow through the first heat exchanger (45) and the third heat exchanger (23) in sequence and then be input into the second turbine (241).

7. The combined cycle coupled compressed air and syngas supplementary combustion peak shaving system according to claim 6, characterized in that The waste heat recovery system further includes: a third turbine (244), and the third turbine (244) is disposed on the second drive shaft (242); a fourth heat exchanger (25), and the condensate water heat-exchanged by the first heat exchanger (45) flows through the fourth heat exchanger (25) and then is input into the third turbine (244).

8. The combined cycle coupled compressed air and syngas supplementary combustion peak shaving system according to claim 7, wherein, The waste heat recovery system further includes a partition member (26), and the partition member (26) divides the waste heat boiler (21) into a first accommodation chamber (211) and a second accommodation chamber (212), and a damper (213) is disposed on the partition member (26), and the second accommodation chamber (212) communicates with the first accommodation chamber (211) through the damper (213). Both the first accommodation chamber (211) and the second accommodation chamber (212) communicate with the flue gas outlet of the gas turbine power generation system (1), and the first heat exchanger (45), the third heat exchanger (23), and the fourth heat exchanger (25) are all disposed in the first accommodation chamber (211), and the second heat exchanger (46) is disposed in the second accommodation chamber (212).

9. A combined cycle coupled with compressed air and syngas supplementary combustion peak shaving method, suitable for the combined cycle coupled with compressed air and syngas supplementary combustion peak shaving system described in any one of the above claims 1-8, characterized in that, including the following steps: S1: When the gas turbine power generation system (1) starts, start the compressor unit (41) to compress air, input the compressed air into the heat conduction tank (44) for heat exchange, and then store the compressed air with reduced temperature into the first gas storage member (42); S2: Deliver the flue gas generated by the gas turbine power generation system (1) into the waste heat boiler (21), open the damper (213) on the partition member (26), and the flue gas diffuses into the first accommodation chamber (211) and the second accommodation chamber (212) respectively. The compressed air in the first gas storage member (42) is sequentially input into the first heat exchanger (45) and the second heat exchanger (46) for heat exchange, turn on the condensate pump (22), and deliver the condensate water to the first heat exchanger (45), the third heat exchanger (23), and the fourth heat exchanger (25) respectively for heat exchange; S3: The gasifier (32) starts to work, and the generated synthesis gas is input into the heat conduction tank (44) through the filter element (33), so that the temperature of the synthesis gas rises. The heated synthesis gas is transported to the afterburner (31), and the afterburner (31) further increases the temperature in the waste heat boiler (21). S4: The compressed air in the second heat exchanger (46) is input into the first turbine (431) to drive the first turbine (431) to rotate. The first turbine (431) drives the first generator (432) to generate electricity through the first drive shaft (433). The heated steam in the third heat exchanger is transported to the second turbine (241), and at the same time, the high-temperature steam in the fourth heat exchanger is transported to the third turbine (244). The second turbine (241) and the third turbine (244) drive the second drive shaft (242) to rotate simultaneously, and the second drive shaft (242) drives the second generator (243) to generate electricity. S5: When the gas turbine power generation system (1) stops, the gasifier (32) stops working, and the high-temperature compressed air in the second heat exchanger is transported to the second gas storage component (47).

10. The combined cycle coupling compressed air and syngas supplementary combustion peak shaving method according to claim 9, characterized in that, After the above step S4 and before step S5, it further includes: S41: When it is necessary to quickly balance the total power generation with the grid load, the high-temperature compressed air in the second gas storage component (47) is transported to the first turbine to drive the first turbine to rotate, and the first turbine drives the first generator (432) to generate electricity through the first drive shaft (433).

11. According to the combined cycle coupling compressed air and syngas supplementary combustion peak shaving method of claim 10, it is characterized in that After the above step S41 and before step S5, it further includes: S42: When the total power generation is greater than the grid load, the compressor unit (41) starts, and the compressed air generated by the compressor unit (41) is input into the first gas storage tank for storage after heat exchange through the heat conduction tank (44).

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