System and operation method for synchronously realizing flue gas waste heat recovery and flexible power regulation

Abstract

The present invention provides a system for synchronously achieving flue gas waste heat recovery and flexible power regulation, comprising: a heat storage body, comprising a first interface and a second interface; an absorption heat pump, comprising a first inlet of the absorption heat pump, a first outlet of the absorption heat pump, a second inlet of the absorption heat pump, and a second outlet of the absorption heat pump; a first heat pump, comprising a first inlet of the first heat pump, a first outlet of the first heat pump, a second inlet of the first heat pump, and a second outlet of the first heat pump; a first heat exchanger, comprising a first inlet of the first heat exchanger, a first outlet of the first heat exchanger, a second inlet of the first heat exchanger, and a second outlet of the first heat exchanger; a second heat exchanger, comprising a first inlet of the second heat exchanger, a first outlet of the second heat exchanger, a second inlet of the second heat exchanger, and a second outlet of the second heat exchanger. The present invention also provides an operating method of the system, including a heat supply method and a heat storage method. The present invention can synchronously achieve flue gas waste heat recovery and flexible power regulation.

Description

Technical Field

[0001] The present invention relates to the field of urban energy technology, and in particular to a system and an operating method for synchronously realizing flue gas waste heat recovery and flexible power regulation. Background Art

[0002] Existing flue gas waste heat recovery technologies are already in use in power plants, boilers, and distributed energy systems. Current technologies can reduce the exhaust temperature of flue gas to around 25°C, close to ambient temperature. However, these current power plant boiler flue gas waste heat recovery systems can only recover flue gas waste heat in winter, meaning they can be used for heating during the heating season. During the non-heating season, when the power plant is operating in pure condensing mode, the flue gas waste heat is often not recovered and discharged.

[0003] On the other hand, all power plants currently offer the flexibility to adjust power generation in winter by using additional boilers to convert electricity into heat or by bypassing the main steam supply. However, this system is energy-inefficient and, in addition, is restricted and unusable in summer and other non-heating seasons, where heating is not provided. In other words, power plants cannot extract steam in summer and other non-heating seasons because they have nowhere to use it. Summary of the Invention

[0004] In order to solve all or part of the above problems, the purpose of the present invention is to provide a system and operation method for synchronously realizing flue gas waste heat recovery and flexible power regulation.

[0005] In a first aspect, the present invention provides a system for simultaneously achieving flue gas waste heat recovery and flexible power regulation, comprising:

[0006] The heat storage body 60 includes a first interface 61 and a second interface 62;

[0007] The absorption heat pump 70 includes a first absorption heat pump inlet 71, a first absorption heat pump outlet 72, a second absorption heat pump inlet 73, and a second absorption heat pump outlet 74;

[0008] The first heat pump 80 includes a first heat pump first inlet 81, a first heat pump first outlet 82, a first heat pump second inlet 83 and a first heat pump second outlet 84;

[0009] The first heat exchanger 90 includes a first heat exchanger first inlet 91, a first heat exchanger first outlet 92, a first heat exchanger second inlet 93, and a first heat exchanger second outlet 94;

[0010] The second heat exchanger 100 includes a second heat exchanger first inlet 101, a second heat exchanger first outlet 102, a second heat exchanger second inlet 103, and a second heat exchanger second outlet 104;

[0011] The heat network return water pipeline is respectively connected to the first interface 61, the first inlet 81 of the first heat pump and the second outlet 74 of the absorption heat pump; the heat network water supply pipeline is respectively connected to the second interface 62, the first outlet 92 of the first heat exchanger and the first outlet 72 of the absorption heat pump;

[0012] The first outlet 82 of the first heat pump is connected to the first inlet 91 of the first heat exchanger, the first inlet 71 of the absorption heat pump, and the second inlet 73 of the absorption heat pump respectively;

[0013] The second outlet 94 of the first heat exchanger is connected to the second inlet 103 of the second heat exchanger. The second inlet 93 of the first heat exchanger is used to input high-temperature flue gas, and the second outlet 104 of the second heat exchanger is used to discharge low-temperature flue gas.

[0014] Optionally, the first outlet 102 of the second heat exchanger is connected to the second inlet 83 of the first heat pump, and the first inlet 101 of the second heat exchanger is connected to the second outlet 84 of the first heat pump.

[0015] Optionally, a first switch valve 1 is provided on the heat network return pipe, and a second switch valve 2 is provided on the heat network supply pipe; by simultaneously opening or closing the first switch valve 1 and the second switch valve 2, the heating system is switched between the heating condition and the heat storage condition.

[0016] Optionally, the driving heat source of the absorption heat pump 70 comes from steam, hot water, flue gas, direct combustion fuel, or a combination of any two or more of the foregoing.

[0017] Optionally, the first heat pump 80 is an electric compression heat pump, an absorption heat pump, or a compression and absorption hybrid drive heat pump.

[0018] Optionally, the driving energy of the first heat pump 80 is electricity generated by a power plant.

[0019] Optionally, the first heat exchanger 90 is a common heat exchanger or a large temperature difference heat exchanger.

[0020] Optionally, the second heat exchanger 100 is a partitioning heat exchanger or a direct contact spray heat exchanger.

[0021] Optionally, a third switch valve 3 is provided on the pipeline connecting the first outlet 82 of the first heat pump and the first inlet 91 of the first heat exchanger; a fourth switch valve 4 is provided on the pipeline connecting the first outlet 82 of the first heat pump and the second inlet 73 of the absorption heat pump; and a fifth switch valve 5 is provided on the pipeline connecting the heat network water supply pipeline and the first outlet 92 of the first heat exchanger.

[0022] Optionally, the heat supply system includes one heat storage body 60, or at least two heat storage bodies 60 connected in parallel or in series;

[0023] Optionally, the heat storage body 60 further includes at least one interface.

[0024] In a second aspect, the present invention provides a heat supply method, which is implemented using the system described in the first aspect of the present invention, and the heat supply method includes:

[0025] Step S101: Open the first on-off valve 1 and the second on-off valve 2. The first return water from the heating network enters the thermal storage body 60 from the first interface 61. The water in the thermal storage body 60 flows out from the second interface 62 and is used as water supply to the heating network.

[0026] Step S102: The high-temperature flue gas is input into the first heat exchanger 90 from the second inlet 93 of the first heat exchanger, and after the first heat exchange and cooling, it is output from the second outlet 94 of the first heat exchanger. Then, the high-temperature flue gas is input into the second heat exchanger 100 from the second inlet 103 of the second heat exchanger, and the low-temperature flue gas obtained after the second heat exchange and cooling is output from the second outlet 104 of the second heat exchanger.

[0027] Step S103: The second stream of heat network return water is fed into the first heat pump 80 from the first inlet 81 of the first heat pump, absorbs heat released by the intermediate medium water, and the resulting medium-temperature water is output from the first outlet 82 of the first heat pump and is divided into a first stream of medium-temperature water, a second stream of medium-temperature water, and a third stream of medium-temperature water.

[0028] Step S104: The first medium-temperature water is fed into the first heat exchanger 90 from the first inlet 91 of the first heat exchanger, absorbs the heat released by the first heat exchange and cooling, and then is output from the first outlet 92 of the first heat exchanger to be used as water supply to the heating network;

[0029] Step S105: The second stream of medium-temperature water and the third stream of medium-temperature water are respectively input into the absorption heat pump 70 from the first inlet 71 and the second inlet 73 of the absorption heat pump. The high-temperature water obtained after heat exchange is output from the first outlet 72 of the absorption heat pump and used as water supply for the heating network. The low-temperature water obtained is output from the second outlet 74 of the absorption heat pump and returned to the first heat pump 80.

[0030] Optionally, in step S103, the intermediate medium water releases heat and is input from the second outlet 84 of the first heat pump, and is input from the first inlet 101 of the second heat exchanger to the second heat exchanger 100. After absorbing the heat released by the second heat exchange and cooling, it is output from the first outlet 102 of the second heat exchanger, and then is input from the second inlet 83 of the first heat pump to the first heat pump 80, thereby performing a cycle.

[0031] In a third aspect, the present invention provides a heat storage method, which is implemented using the system described in the first aspect of the present invention, and the heat storage method includes:

[0032] Step S201: Close the first on-off valve 1 and the second on-off valve 2. The water in the heat storage body 60 flows out from the first port 61 and enters the first heat pump 80 through the first inlet 81 of the first heat pump. The water absorbs the heat released by the intermediate medium water. The resulting medium-temperature water is output from the first outlet 82 of the first heat pump and is divided into a first stream of medium-temperature water, a second stream of medium-temperature water, and a third stream of medium-temperature water.

[0033] Step S202: The high-temperature flue gas is input into the first heat exchanger 90 from the second inlet 93 of the first heat exchanger, and after the first heat exchange and cooling, it is output from the second outlet 94 of the first heat exchanger. Then, the high-temperature flue gas is input into the second heat exchanger 100 from the second inlet 103 of the second heat exchanger, and the low-temperature flue gas obtained after the second heat exchange and cooling is output from the second outlet 104 of the second heat exchanger.

[0034] Step S203: The first medium-temperature water is input into the first heat exchanger 90 from the first inlet 91 of the first heat exchanger, absorbs the heat released by the first heat exchange and cooling, and then outputs from the first outlet 92 of the first heat exchanger, and then inputs into the heat storage body 60 from the second interface 62;

[0035] Step S204: The second stream of medium-temperature water and the third stream of medium-temperature water are respectively input into the absorption heat pump 70 from the first inlet 71 and the second inlet 73 of the absorption heat pump. The high-temperature water obtained after heat exchange is output from the first outlet 72 of the absorption heat pump, and then input into the heat storage body 60 from the second interface 62. The obtained low-temperature water is output from the second outlet 74 of the absorption heat pump and returned to the first heat pump 80.

[0036] Optionally, in step S201, the intermediate medium water is input from the second outlet (84) after releasing heat, and is input into the second heat exchanger 100 from the first inlet 101 of the second heat exchanger, and is output from the first outlet 102 of the second heat exchanger after absorbing the heat released by the second heat exchange and cooling, and then is input into the first heat pump 80 from the second inlet 83 of the first heat pump, thereby performing a cycle.

[0037] As can be seen from the above technical solutions, the heating system and method provided by the present invention for simultaneously realizing flue gas waste heat recovery and flexible power regulation have the following advantages:

[0038] The heating system provided by the present invention provides a heat storage body, which raises the recovered flue gas waste heat to a high temperature in the non-heating season and stores it in the form of high-temperature hot water. The high-temperature hot water is released in the heating season. At the same time, the flue gas waste heat is deeply recovered during the heating season. Both parts of heat are used for heating, which greatly increases the heating capacity and total heating amount of the system.

[0039] The heating system provided by this invention divides intermediate-grade heat into three streams. One stream is used to raise the temperature to a high thermal storage temperature, while another stream of intermediate-temperature hot water serves as a low-level heat source for an absorption heat pump. This stream enters the absorption heat pump's evaporator and is cooled to the return water temperature of the heating network. This design avoids the limitations of low-grade heat sources. Furthermore, a stream of this intermediate-temperature hot water is separated to directly exchange heat with the high-temperature flue gas, raising the temperature directly to a high temperature.

[0040] The heating system provided by this invention can also extract steam during the non-heating period, reducing the power generation load. When no users are using the system, the extracted steam is used to recover waste heat from the flue gas and store it at a high temperature, eliminating any energy waste and achieving extremely high energy efficiency. The system can be flexibly adjusted year-round. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0042] Figure 1 It is a structural diagram of the system of Example 1 of the present invention. DETAILED DESCRIPTION

[0043] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0044] Example 1

[0045] like Figure 1, which is a schematic structural diagram of a system according to embodiment 1 of the present invention, including: a heat storage body 60, including a first interface 61 and a second interface 62; an absorption heat pump 70, including a first inlet 71 of the absorption heat pump, a first outlet 72 of the absorption heat pump, a second inlet 73 of the absorption heat pump, and a second outlet 74 of the absorption heat pump; a first heat pump 80, including a first inlet 81 of the first heat pump, a first outlet 82 of the first heat pump, a second inlet 83 of the first heat pump, and a second outlet 84 of the first heat pump; a first heat exchanger 90, including a first inlet 91 of the first heat exchanger, a first outlet 92 of the first heat exchanger, a second inlet 93 of the first heat exchanger, and a second outlet 94 of the first heat exchanger; a second heat exchanger 100, including a first inlet 101 of the second heat exchanger, a first outlet 82 of the first heat exchanger, a second inlet 83 of the first heat exchanger, and a second outlet 84 of the first heat exchanger; The first outlet 102 of the second heat exchanger, the second inlet 103 of the second heat exchanger and the second outlet 104 of the second heat exchanger; the heat network return water pipeline is respectively connected to the first interface 61, the first inlet 81 of the first heat pump and the second outlet 74 of the absorption heat pump; the heat network water supply pipeline is respectively connected to the second interface 62, the first outlet 92 of the first heat exchanger and the first outlet 72 of the absorption heat pump; the first outlet 82 of the first heat pump is respectively connected to the first inlet 91 of the first heat exchanger, the first inlet 71 of the absorption heat pump and the second inlet 73 of the absorption heat pump; the second outlet 94 of the first heat exchanger is connected to the second inlet 103 of the second heat exchanger, the second inlet 93 of the first heat exchanger is used to input high-temperature flue gas, and the second outlet 104 of the second heat exchanger is used to discharge low-temperature flue gas.

[0046] Preferably, the heating system of this embodiment may include one thermal storage body 60, or may include multiple thermal storage bodies 60. The multiple thermal storage bodies 60 may be connected in series or in parallel, or the thermal storage body 60 may be divided into multiple small compartments. In this embodiment, the thermal storage body 60 includes two interfaces, but this is merely exemplary, and the thermal storage body 60 may include more than two interfaces. This embodiment does not limit the structural form of the thermal storage body 60; it may be an above-ground or underground structure or a storage tank, etc., as long as it can meet the heat storage function.

[0047] like Figure 1 As shown, the high-temperature flue gas is input into the first heat exchanger 90 through the second inlet 93 of the first heat exchanger, and the medium-temperature flue gas obtained after the first heat exchange and cooling is output from the second outlet 94 of the first heat exchanger, transported through the pipeline, and input into the second heat exchanger 100 through the second inlet 103 of the second heat exchanger. The low-temperature flue gas obtained after the second heat exchange and cooling is discharged from the second outlet 104 of the second heat exchanger.

[0048] Preferably, the first heat exchanger 90 is a common heat exchanger or a large temperature difference heat exchanger.

[0049] Preferably, the second heat exchanger 100 is a partitioning heat exchanger or a direct contact spray heat exchanger.

[0050] like Figure 1As shown, the first outlet 102 of the second heat exchanger is connected to the second inlet 83 of the first heat pump, and the first inlet 101 of the second heat exchanger is connected to the second outlet 84 of the first heat pump. The medium-temperature flue gas exchanges heat and cools down in the second heat exchanger 100, transferring the released heat energy to the low-temperature water input through the first inlet 101 of the second heat exchanger. The low-temperature water absorbs the heat energy, raising its own temperature, and is output from the first outlet 102 of the second heat exchanger. It is transported through a pipeline and input from the second inlet 83 of the first heat pump to the evaporator side of the first heat pump 80, serving as a low-grade heat source for the first heat pump 80. Heat is exchanged within the first heat pump 80, transferring heat to the return water from the first inlet 81 of the first heat pump, thereby reducing its own temperature and converting it back into low-temperature water. The low-temperature water is output from the second outlet 84 of the first heat pump, transported through a pipeline, and input again from the first inlet 101 of the second heat exchanger to the second heat exchanger 100, thus completing the cycle.

[0051] Preferably, the first heat pump 80 is an electric compression heat pump, an absorption heat pump, or a compression and absorption hybrid drive heat pump.

[0052] like Figure 1 As shown, the heat network return pipe is respectively connected to the first port 61, the first inlet 81 of the first heat pump, and the second outlet 74 of the absorption heat pump. The first outlet 82 of the first heat pump is respectively connected to the first inlet 91 of the first heat exchanger, the first inlet 71 of the absorption heat pump, and the second inlet 73 of the absorption heat pump. The heat network water supply pipe is respectively connected to the second port 62, the first outlet 92 of the first heat exchanger, and the first outlet 72 of the absorption heat pump.

[0053] Return water from the heating network is fed into the first heat pump 80 through the first inlet 81 of the first heat pump, where it absorbs heat to produce medium-temperature water. This medium-temperature water is then discharged from the first outlet 82 of the first heat pump and split into three streams. One stream of medium-temperature water is fed into the first heat exchanger 90 through the first inlet 91 of the first heat exchanger. This medium-temperature water absorbs heat released by the high-temperature flue gas during the initial heat exchange and cooling process in the first heat exchanger 90, raising its temperature to become high-temperature water, which is then discharged from the first outlet 92 of the first heat exchanger.

[0054] Preferably, a third switch valve 3 is provided on the pipeline connecting the first outlet 82 of the first heat pump to the first inlet 91 of the first heat exchanger, so as to control the opening or closing of the pipeline, or control the speed of the medium-temperature water delivery, etc.

[0055] Preferably, a fifth switch valve 5 is provided on the pipeline connecting the first outlet 92 of the first heat exchanger to the water supply of the heating network, so as to control the opening or closing of the pipeline, or control the speed of the high-temperature water delivery, etc.

[0056] Another stream of medium-temperature water is fed into the absorption heat pump 70 through the absorption heat pump's first inlet 71. A third stream of water is fed into the absorption heat pump 70 through the absorption heat pump's second inlet 73, serving as a low-grade heat source for the absorption heat pump 70. After heat exchange, the resulting high-temperature water is output through the absorption heat pump's first outlet 72, and the resulting low-temperature water is output through the absorption heat pump's second outlet 74. The water then merges with the return water from the heat network and is fed back into the first heat pump 80 through the first inlet 81.

[0057] Preferably, a fourth switch valve 4 is provided on the pipeline connecting the first outlet 82 of the first heat pump to the second inlet 73 of the absorption heat pump, so as to control the opening or closing of the pipeline, or control the speed of the medium-temperature water delivery, etc.

[0058] Preferably, the heat source for driving the absorption heat pump 70 is steam from the power plant. For example, when the heating system of this embodiment needs to reduce its generated power, the heating system extracts more steam, which is used to drive the absorption heat pump 70 in the heating system of this embodiment. At the same time, the electricity generated by the power plant can be used to drive the first heat pump 80, which consumes the generated power.

[0059] Preferably, a first switch valve 1 is provided on the return water pipeline of the heating network, and a second switch valve 2 is provided on the water supply pipeline of the heating network; by simultaneously opening or closing the first switch valve 1 and the second switch valve 2, the heating system of this embodiment is switched between the heating condition and the heat storage condition.

[0060] Example 2

[0061] When the first on-off valve 1 and the second on-off valve 2 of the system of Example 1 are opened at the same time, the operation mode of the system is heating mode. The details are as follows:

[0062] After cooling through the first heat exchanger 90, the high-temperature flue gas is fed into the second heat exchanger 100 for further cooling. The heat is released to the evaporator side of the first heat pump 80 through the intermediate medium water, serving as a low-grade heat source. The final system exhaust temperature can be as low as ambient temperature. The high-temperature flue gas can come from any source, such as power plants, boilers, and distributed energy systems, and its temperature can exceed 600°C.

[0063] The return water from the heating network is divided into two streams. The first return water from the heating network enters the heat storage body 60 from the first interface 61. The low-temperature return water from the heating network pushes the high-temperature hot water stored in the heat storage body 60 out from the second interface 62 and transports it to the heating network water supply pipeline for heating, while storing the low-temperature water in the heat storage body 60.

[0064] The second return water from the heating network enters the first heat pump 80, is heated to a medium temperature, and then flows out from the first heat pump first outlet 82 of the first heat pump 80. The medium temperature water is then divided into three streams.

[0065] The first stream of medium-temperature water enters the first heat exchanger 90 through the first inlet 91 of the first heat exchanger, where it directly exchanges heat with the high-temperature flue gas and is raised to the heating temperature. It is then output from the first outlet 92 of the first heat exchanger and delivered to the heating network water supply pipeline for heating. The second stream of medium-temperature water enters the absorption heat pump first inlet 71 of the absorption heat pump 70, where it is heated to the heating temperature and then flows out from the absorption heat pump first outlet 72 of the absorption heat pump 70 and is delivered to the heating network water supply pipeline for heating. The third stream of medium-temperature water enters the absorption heat pump second inlet 73 of the absorption heat pump 70, where it serves as the absorption heat pump 70's own low-level heat source. It is cooled to the return water temperature of the heating network and then delivered to the first heat pump first inlet 81 of the first heat pump 80 along with the return water from the heating network.

[0066] Example 3

[0067] When the first on-off valve 1 and the second on-off valve 2 of the system of Example 1 are closed at the same time, the operation mode of the system is a heat storage mode. The details are as follows:

[0068] The low-temperature water in the heat storage body 60 flows out from the first interface 61, merges with the low-temperature water coming out of the absorption heat pump second outlet 74 of the absorption heat pump 70, and then enters the first heat pump first inlet 81 of the first heat pump 80. After being heated by the first heat pump 80, it flows out from the first heat pump first outlet 82 and is divided into three streams, namely, the first stream of medium-temperature water, the second stream of medium-temperature water and the third stream of medium-temperature water.

[0069] The first stream of medium-temperature water enters the first heat exchanger 90 from the first inlet 91 of the first heat exchanger, directly exchanges heat with the high-temperature flue gas, and rises to the heat storage temperature. It is output from the first outlet 92 of the first heat exchanger and sent to the heat storage body 60 from the second interface 62; the second stream of medium-temperature water enters the absorption heat pump first inlet 71 of the absorption heat pump 70, is heated to the heating temperature, and then flows out from the absorption heat pump first outlet 72 of the absorption heat pump 70, rises to the heat storage temperature, and is sent to the heat storage body 60 from the second interface 62; the third stream of medium-temperature water enters the absorption heat pump second inlet 73 of the absorption heat pump 70, serves as the low-level heat source of the absorption heat pump 70 itself, and is cooled to the low-temperature water temperature.

[0070] After cooling through the first heat exchanger 90, the high-temperature flue gas is fed into the second heat exchanger 100 for further cooling. This heat is released to the evaporator side of the first heat pump 80 via the intermediate medium water, serving as a low-grade heat source. Ultimately, the system exhaust temperature can be reduced to ambient temperature. The thermal storage element completes heat storage, reaching a temperature of 90°C to 95°C.

[0071] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0072] The terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present invention, "plurality" means more than two, unless otherwise specifically defined.

[0073] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed or detachable connections; direct or indirect connections through an intermediate medium; and they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0074] In the present application, the numbering of each step is not intended to limit the order of the steps. Those skilled in the art can determine whether the steps are performed simultaneously or in a certain order based on actual conditions.

[0075] In this application, "heating network water supply" and "heating network return water" have the meanings commonly understood by those skilled in the art.

[0076] In this application, "low-temperature water", "medium-temperature water", "high-temperature water", etc. are relative concepts, which are only intended to illustrate the heating or cooling process of water, rather than to limit the specific temperature of water.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A system for synchronously realizing flue gas waste heat recovery and flexible power regulation, characterized in that: include: A heat storage body (60) comprising a first interface (61) and a second interface (62); An absorption heat pump (70) comprises a first absorption heat pump inlet (71), a first absorption heat pump outlet (72), a second absorption heat pump inlet (73), and a second absorption heat pump outlet (74); a driving heat source of the absorption heat pump (70) is derived from steam, hot water, flue gas, direct combustion fuel, or a combination of any two or more of the foregoing; The first heat pump (80) is an electric compression heat pump, comprising a first heat pump first inlet (81), a first heat pump first outlet (82), a first heat pump second inlet (83) and a first heat pump second outlet (84); A first heat exchanger (90), comprising a first heat exchanger first inlet (91), a first heat exchanger first outlet (92), a first heat exchanger second inlet (93), and a first heat exchanger second outlet (94); A second heat exchanger (100), comprising a second heat exchanger first inlet (101), a second heat exchanger first outlet (102), a second heat exchanger second inlet (103), and a second heat exchanger second outlet (104); The heat network return water pipeline is respectively connected to the first interface (61), the first inlet (81) of the first heat pump, and the second outlet (74) of the absorption heat pump; the heat network water supply pipeline is respectively connected to the second interface (62), the first outlet (92) of the first heat exchanger, and the first outlet (72) of the absorption heat pump; a first switch valve (1) is provided on the heat network return water pipeline, and a second switch valve (2) is provided on the heat network water supply pipeline; by simultaneously opening or closing the first switch valve (1) and the second switch valve (2), the system is switched between a heating mode and a heat storage mode; The first outlet (82) of the first heat pump is respectively connected to the first inlet (91) of the first heat exchanger, the first inlet (71) of the absorption heat pump, and the second inlet (73) of the absorption heat pump; The second outlet (94) of the first heat exchanger is connected to the second inlet (103) of the second heat exchanger, the second inlet (93) of the first heat exchanger is used to input high-temperature flue gas, and the second outlet (104) of the second heat exchanger is used to discharge low-temperature flue gas; The first outlet (102) of the second heat exchanger is connected to the second inlet (83) of the first heat pump and serves as a low-grade heat source for the first heat pump (80); the first inlet (101) of the second heat exchanger is connected to the second outlet (84) of the first heat pump; A third on-off valve (3) is provided on the pipeline connecting the first outlet (82) of the first heat pump and the first inlet (91) of the first heat exchanger; a fourth on-off valve (4) is provided on the pipeline connecting the first outlet (82) of the first heat pump and the second inlet (73) of the absorption heat pump; and a fifth on-off valve (5) is provided on the pipeline connecting the heating network water supply pipeline and the first outlet (92) of the first heat exchanger.

2. The system according to claim 1, wherein: The driving energy source of the first heat pump (80) is power generated by a power plant.

3. The system according to claim 1, wherein: The second heat exchanger (100) is a partition-type heat exchanger or a direct contact spray-type heat exchanger.

4. The system according to claim 1, wherein: The system comprises a heat storage body (60), or at least two heat storage bodies (60) connected in parallel or in series.

5. A heating method, characterized in that: The system according to any one of claims 1 to 4 is used for implementation, wherein the heating method comprises: Step S101: opening the first on-off valve (1) and the second on-off valve (2), the first stream of heat network return water enters the heat storage body (60) from the first interface (61), and the water in the heat storage body (60) flows out from the second interface (62) and is used as heat network water supply; Step S102: high-temperature flue gas is input into the first heat exchanger (90) from the second inlet (93) of the first heat exchanger, and is output from the second outlet (94) of the first heat exchanger after a first heat exchange and cooling. The high-temperature flue gas is then input into the second heat exchanger (100) from the second inlet (103) of the second heat exchanger, and low-temperature flue gas obtained after a second heat exchange and cooling is output from the second outlet (104) of the second heat exchanger. Step S103: The second stream of heat network return water is input into the first heat pump (80) from the first inlet (81) of the first heat pump, absorbs heat, and the obtained medium-temperature water is output from the first outlet (82) of the first heat pump and is divided into the first stream of medium-temperature water, the second stream of medium-temperature water, and the third stream of medium-temperature water; Step S104: the first stream of medium-temperature water is input into the first heat exchanger (90) from the first inlet (91) of the first heat exchanger, absorbs the heat released by the first heat exchange and cooling, and then output from the first outlet (92) of the first heat exchanger to be used as water supply for the heating network; Step S105: The second stream of medium-temperature water and the third stream of medium-temperature water are respectively input into the absorption heat pump (70) from the first inlet (71) and the second inlet (73) of the absorption heat pump. The high-temperature water obtained after heat exchange is output from the first outlet (72) of the absorption heat pump and used as water supply for the heating network. The low-temperature water obtained is output from the second outlet (74) of the absorption heat pump and returned to the first heat pump (80).

6. The heating method according to claim 5, characterized in that: In step S103, the intermediate medium water releases heat and is output from the second outlet (84) of the first heat pump, and is input into the second heat exchanger (100) from the first inlet (101) of the second heat exchanger. After absorbing the heat released by the second heat exchange and cooling, the intermediate medium water is output from the first outlet (102) of the second heat exchanger, and is then input into the first heat pump (80) from the second inlet (83) of the first heat pump, thereby performing a cycle.

7. A heat storage method, characterized in that: The system according to any one of claims 1 to 4 is implemented, wherein the heat storage method comprises: Step S201: closing the first on-off valve (1) and the second on-off valve (2), the water in the heat storage body (60) flows out from the first interface (61), is input into the first heat pump (80) from the first inlet (81) of the first heat pump, absorbs heat, and the obtained medium-temperature water is output from the first outlet (82) of the first heat pump and is divided into a first stream of medium-temperature water, a second stream of medium-temperature water, and a third stream of medium-temperature water; Step S202: high-temperature flue gas is input into the first heat exchanger (90) from the second inlet (93) of the first heat exchanger, and is output from the second outlet (94) of the first heat exchanger after the first heat exchange and cooling. The flue gas is then input into the second heat exchanger (100) from the second inlet (103) of the second heat exchanger, and the low-temperature flue gas obtained after the second heat exchange and cooling is output from the second outlet (104) of the second heat exchanger. Step S203: the first stream of medium-temperature water is input into the first heat exchanger (90) from the first inlet (91) of the first heat exchanger, absorbs the heat released by the first heat exchange and cooling, and then outputs from the first outlet (92) of the first heat exchanger, and then inputs into the heat storage body (60) from the second interface (62); Step S204: The second stream of medium-temperature water and the third stream of medium-temperature water are respectively input into the absorption heat pump (70) from the first inlet (71) and the second inlet (73) of the absorption heat pump. The high-temperature water obtained after heat exchange is output from the first outlet (72) of the absorption heat pump and then input into the heat storage body (60) from the second interface (62). The low-temperature water obtained is output from the second outlet (74) of the absorption heat pump and returned to the first heat pump (80).

8. The heat storage method according to claim 7, characterized in that: In step S201, the intermediate medium water releases heat and is output from the second outlet (84) of the first heat pump, and is input into the second heat exchanger (100) from the first inlet (101) of the second heat exchanger. After absorbing the heat released by the second heat exchange and cooling, the intermediate medium water is output from the first outlet (102) of the second heat exchanger, and is then input into the first heat pump (80) from the second inlet (83) of the first heat pump, thereby performing a cycle.

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